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-rw-r--r--drivers/clk/Kconfig1
-rw-r--r--drivers/clk/Makefile1
-rw-r--r--drivers/clk/bcm/Kconfig9
-rw-r--r--drivers/clk/bcm/Makefile3
-rw-r--r--drivers/clk/bcm/clk-bcm281xx.c416
-rw-r--r--drivers/clk/bcm/clk-kona-setup.c769
-rw-r--r--drivers/clk/bcm/clk-kona.c1033
-rw-r--r--drivers/clk/bcm/clk-kona.h410
-rw-r--r--include/dt-bindings/clock/bcm281xx.h65
9 files changed, 2707 insertions, 0 deletions
diff --git a/drivers/clk/Kconfig b/drivers/clk/Kconfig
index 7641965d208d..f9f605695e40 100644
--- a/drivers/clk/Kconfig
+++ b/drivers/clk/Kconfig
@@ -111,4 +111,5 @@ source "drivers/clk/qcom/Kconfig"
111 111
112endmenu 112endmenu
113 113
114source "drivers/clk/bcm/Kconfig"
114source "drivers/clk/mvebu/Kconfig" 115source "drivers/clk/mvebu/Kconfig"
diff --git a/drivers/clk/Makefile b/drivers/clk/Makefile
index a367a9831717..88af4a399d6c 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -29,6 +29,7 @@ obj-$(CONFIG_ARCH_VT8500) += clk-vt8500.o
29obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o 29obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
30obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o 30obj-$(CONFIG_COMMON_CLK_XGENE) += clk-xgene.o
31obj-$(CONFIG_COMMON_CLK_AT91) += at91/ 31obj-$(CONFIG_COMMON_CLK_AT91) += at91/
32obj-$(CONFIG_ARCH_BCM_MOBILE) += bcm/
32obj-$(CONFIG_ARCH_HI3xxx) += hisilicon/ 33obj-$(CONFIG_ARCH_HI3xxx) += hisilicon/
33obj-$(CONFIG_COMMON_CLK_KEYSTONE) += keystone/ 34obj-$(CONFIG_COMMON_CLK_KEYSTONE) += keystone/
34ifeq ($(CONFIG_COMMON_CLK), y) 35ifeq ($(CONFIG_COMMON_CLK), y)
diff --git a/drivers/clk/bcm/Kconfig b/drivers/clk/bcm/Kconfig
new file mode 100644
index 000000000000..a7262fb8ce55
--- /dev/null
+++ b/drivers/clk/bcm/Kconfig
@@ -0,0 +1,9 @@
1config CLK_BCM_KONA
2 bool "Broadcom Kona CCU clock support"
3 depends on ARCH_BCM_MOBILE
4 depends on COMMON_CLK
5 default y
6 help
7 Enable common clock framework support for Broadcom SoCs
8 using "Kona" style clock control units, including those
9 in the BCM281xx family.
diff --git a/drivers/clk/bcm/Makefile b/drivers/clk/bcm/Makefile
new file mode 100644
index 000000000000..cf93359aa862
--- /dev/null
+++ b/drivers/clk/bcm/Makefile
@@ -0,0 +1,3 @@
1obj-$(CONFIG_CLK_BCM_KONA) += clk-kona.o
2obj-$(CONFIG_CLK_BCM_KONA) += clk-kona-setup.o
3obj-$(CONFIG_CLK_BCM_KONA) += clk-bcm281xx.o
diff --git a/drivers/clk/bcm/clk-bcm281xx.c b/drivers/clk/bcm/clk-bcm281xx.c
new file mode 100644
index 000000000000..3c66de696aeb
--- /dev/null
+++ b/drivers/clk/bcm/clk-bcm281xx.c
@@ -0,0 +1,416 @@
1/*
2 * Copyright (C) 2013 Broadcom Corporation
3 * Copyright 2013 Linaro Limited
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation version 2.
8 *
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether express or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include "clk-kona.h"
16#include "dt-bindings/clock/bcm281xx.h"
17
18/* bcm11351 CCU device tree "compatible" strings */
19#define BCM11351_DT_ROOT_CCU_COMPAT "brcm,bcm11351-root-ccu"
20#define BCM11351_DT_AON_CCU_COMPAT "brcm,bcm11351-aon-ccu"
21#define BCM11351_DT_HUB_CCU_COMPAT "brcm,bcm11351-hub-ccu"
22#define BCM11351_DT_MASTER_CCU_COMPAT "brcm,bcm11351-master-ccu"
23#define BCM11351_DT_SLAVE_CCU_COMPAT "brcm,bcm11351-slave-ccu"
24
25/* Root CCU clocks */
26
27static struct peri_clk_data frac_1m_data = {
28 .gate = HW_SW_GATE(0x214, 16, 0, 1),
29 .trig = TRIGGER(0x0e04, 0),
30 .div = FRAC_DIVIDER(0x0e00, 0, 22, 16),
31 .clocks = CLOCKS("ref_crystal"),
32};
33
34/* AON CCU clocks */
35
36static struct peri_clk_data hub_timer_data = {
37 .gate = HW_SW_GATE(0x0414, 16, 0, 1),
38 .clocks = CLOCKS("bbl_32k",
39 "frac_1m",
40 "dft_19_5m"),
41 .sel = SELECTOR(0x0a10, 0, 2),
42 .trig = TRIGGER(0x0a40, 4),
43};
44
45static struct peri_clk_data pmu_bsc_data = {
46 .gate = HW_SW_GATE(0x0418, 16, 0, 1),
47 .clocks = CLOCKS("ref_crystal",
48 "pmu_bsc_var",
49 "bbl_32k"),
50 .sel = SELECTOR(0x0a04, 0, 2),
51 .div = DIVIDER(0x0a04, 3, 4),
52 .trig = TRIGGER(0x0a40, 0),
53};
54
55static struct peri_clk_data pmu_bsc_var_data = {
56 .clocks = CLOCKS("var_312m",
57 "ref_312m"),
58 .sel = SELECTOR(0x0a00, 0, 2),
59 .div = DIVIDER(0x0a00, 4, 5),
60 .trig = TRIGGER(0x0a40, 2),
61};
62
63/* Hub CCU clocks */
64
65static struct peri_clk_data tmon_1m_data = {
66 .gate = HW_SW_GATE(0x04a4, 18, 2, 3),
67 .clocks = CLOCKS("ref_crystal",
68 "frac_1m"),
69 .sel = SELECTOR(0x0e74, 0, 2),
70 .trig = TRIGGER(0x0e84, 1),
71};
72
73/* Master CCU clocks */
74
75static struct peri_clk_data sdio1_data = {
76 .gate = HW_SW_GATE(0x0358, 18, 2, 3),
77 .clocks = CLOCKS("ref_crystal",
78 "var_52m",
79 "ref_52m",
80 "var_96m",
81 "ref_96m"),
82 .sel = SELECTOR(0x0a28, 0, 3),
83 .div = DIVIDER(0x0a28, 4, 14),
84 .trig = TRIGGER(0x0afc, 9),
85};
86
87static struct peri_clk_data sdio2_data = {
88 .gate = HW_SW_GATE(0x035c, 18, 2, 3),
89 .clocks = CLOCKS("ref_crystal",
90 "var_52m",
91 "ref_52m",
92 "var_96m",
93 "ref_96m"),
94 .sel = SELECTOR(0x0a2c, 0, 3),
95 .div = DIVIDER(0x0a2c, 4, 14),
96 .trig = TRIGGER(0x0afc, 10),
97};
98
99static struct peri_clk_data sdio3_data = {
100 .gate = HW_SW_GATE(0x0364, 18, 2, 3),
101 .clocks = CLOCKS("ref_crystal",
102 "var_52m",
103 "ref_52m",
104 "var_96m",
105 "ref_96m"),
106 .sel = SELECTOR(0x0a34, 0, 3),
107 .div = DIVIDER(0x0a34, 4, 14),
108 .trig = TRIGGER(0x0afc, 12),
109};
110
111static struct peri_clk_data sdio4_data = {
112 .gate = HW_SW_GATE(0x0360, 18, 2, 3),
113 .clocks = CLOCKS("ref_crystal",
114 "var_52m",
115 "ref_52m",
116 "var_96m",
117 "ref_96m"),
118 .sel = SELECTOR(0x0a30, 0, 3),
119 .div = DIVIDER(0x0a30, 4, 14),
120 .trig = TRIGGER(0x0afc, 11),
121};
122
123static struct peri_clk_data usb_ic_data = {
124 .gate = HW_SW_GATE(0x0354, 18, 2, 3),
125 .clocks = CLOCKS("ref_crystal",
126 "var_96m",
127 "ref_96m"),
128 .div = FIXED_DIVIDER(2),
129 .sel = SELECTOR(0x0a24, 0, 2),
130 .trig = TRIGGER(0x0afc, 7),
131};
132
133/* also called usbh_48m */
134static struct peri_clk_data hsic2_48m_data = {
135 .gate = HW_SW_GATE(0x0370, 18, 2, 3),
136 .clocks = CLOCKS("ref_crystal",
137 "var_96m",
138 "ref_96m"),
139 .sel = SELECTOR(0x0a38, 0, 2),
140 .div = FIXED_DIVIDER(2),
141 .trig = TRIGGER(0x0afc, 5),
142};
143
144/* also called usbh_12m */
145static struct peri_clk_data hsic2_12m_data = {
146 .gate = HW_SW_GATE(0x0370, 20, 4, 5),
147 .div = DIVIDER(0x0a38, 12, 2),
148 .clocks = CLOCKS("ref_crystal",
149 "var_96m",
150 "ref_96m"),
151 .pre_div = FIXED_DIVIDER(2),
152 .sel = SELECTOR(0x0a38, 0, 2),
153 .trig = TRIGGER(0x0afc, 5),
154};
155
156/* Slave CCU clocks */
157
158static struct peri_clk_data uartb_data = {
159 .gate = HW_SW_GATE(0x0400, 18, 2, 3),
160 .clocks = CLOCKS("ref_crystal",
161 "var_156m",
162 "ref_156m"),
163 .sel = SELECTOR(0x0a10, 0, 2),
164 .div = FRAC_DIVIDER(0x0a10, 4, 12, 8),
165 .trig = TRIGGER(0x0afc, 2),
166};
167
168static struct peri_clk_data uartb2_data = {
169 .gate = HW_SW_GATE(0x0404, 18, 2, 3),
170 .clocks = CLOCKS("ref_crystal",
171 "var_156m",
172 "ref_156m"),
173 .sel = SELECTOR(0x0a14, 0, 2),
174 .div = FRAC_DIVIDER(0x0a14, 4, 12, 8),
175 .trig = TRIGGER(0x0afc, 3),
176};
177
178static struct peri_clk_data uartb3_data = {
179 .gate = HW_SW_GATE(0x0408, 18, 2, 3),
180 .clocks = CLOCKS("ref_crystal",
181 "var_156m",
182 "ref_156m"),
183 .sel = SELECTOR(0x0a18, 0, 2),
184 .div = FRAC_DIVIDER(0x0a18, 4, 12, 8),
185 .trig = TRIGGER(0x0afc, 4),
186};
187
188static struct peri_clk_data uartb4_data = {
189 .gate = HW_SW_GATE(0x0408, 18, 2, 3),
190 .clocks = CLOCKS("ref_crystal",
191 "var_156m",
192 "ref_156m"),
193 .sel = SELECTOR(0x0a1c, 0, 2),
194 .div = FRAC_DIVIDER(0x0a1c, 4, 12, 8),
195 .trig = TRIGGER(0x0afc, 5),
196};
197
198static struct peri_clk_data ssp0_data = {
199 .gate = HW_SW_GATE(0x0410, 18, 2, 3),
200 .clocks = CLOCKS("ref_crystal",
201 "var_104m",
202 "ref_104m",
203 "var_96m",
204 "ref_96m"),
205 .sel = SELECTOR(0x0a20, 0, 3),
206 .div = DIVIDER(0x0a20, 4, 14),
207 .trig = TRIGGER(0x0afc, 6),
208};
209
210static struct peri_clk_data ssp2_data = {
211 .gate = HW_SW_GATE(0x0418, 18, 2, 3),
212 .clocks = CLOCKS("ref_crystal",
213 "var_104m",
214 "ref_104m",
215 "var_96m",
216 "ref_96m"),
217 .sel = SELECTOR(0x0a28, 0, 3),
218 .div = DIVIDER(0x0a28, 4, 14),
219 .trig = TRIGGER(0x0afc, 8),
220};
221
222static struct peri_clk_data bsc1_data = {
223 .gate = HW_SW_GATE(0x0458, 18, 2, 3),
224 .clocks = CLOCKS("ref_crystal",
225 "var_104m",
226 "ref_104m",
227 "var_13m",
228 "ref_13m"),
229 .sel = SELECTOR(0x0a64, 0, 3),
230 .trig = TRIGGER(0x0afc, 23),
231};
232
233static struct peri_clk_data bsc2_data = {
234 .gate = HW_SW_GATE(0x045c, 18, 2, 3),
235 .clocks = CLOCKS("ref_crystal",
236 "var_104m",
237 "ref_104m",
238 "var_13m",
239 "ref_13m"),
240 .sel = SELECTOR(0x0a68, 0, 3),
241 .trig = TRIGGER(0x0afc, 24),
242};
243
244static struct peri_clk_data bsc3_data = {
245 .gate = HW_SW_GATE(0x0484, 18, 2, 3),
246 .clocks = CLOCKS("ref_crystal",
247 "var_104m",
248 "ref_104m",
249 "var_13m",
250 "ref_13m"),
251 .sel = SELECTOR(0x0a84, 0, 3),
252 .trig = TRIGGER(0x0b00, 2),
253};
254
255static struct peri_clk_data pwm_data = {
256 .gate = HW_SW_GATE(0x0468, 18, 2, 3),
257 .clocks = CLOCKS("ref_crystal",
258 "var_104m"),
259 .sel = SELECTOR(0x0a70, 0, 2),
260 .div = DIVIDER(0x0a70, 4, 3),
261 .trig = TRIGGER(0x0afc, 15),
262};
263
264/*
265 * CCU setup routines
266 *
267 * These are called from kona_dt_ccu_setup() to initialize the array
268 * of clocks provided by the CCU. Once allocated, the entries in
269 * the array are initialized by calling kona_clk_setup() with the
270 * initialization data for each clock. They return 0 if successful
271 * or an error code otherwise.
272 */
273static int __init bcm281xx_root_ccu_clks_setup(struct ccu_data *ccu)
274{
275 struct clk **clks;
276 size_t count = BCM281XX_ROOT_CCU_CLOCK_COUNT;
277
278 clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
279 if (!clks) {
280 pr_err("%s: failed to allocate root clocks\n", __func__);
281 return -ENOMEM;
282 }
283 ccu->data.clks = clks;
284 ccu->data.clk_num = count;
285
286 PERI_CLK_SETUP(clks, ccu, BCM281XX_ROOT_CCU_FRAC_1M, frac_1m);
287
288 return 0;
289}
290
291static int __init bcm281xx_aon_ccu_clks_setup(struct ccu_data *ccu)
292{
293 struct clk **clks;
294 size_t count = BCM281XX_AON_CCU_CLOCK_COUNT;
295
296 clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
297 if (!clks) {
298 pr_err("%s: failed to allocate aon clocks\n", __func__);
299 return -ENOMEM;
300 }
301 ccu->data.clks = clks;
302 ccu->data.clk_num = count;
303
304 PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_HUB_TIMER, hub_timer);
305 PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_PMU_BSC, pmu_bsc);
306 PERI_CLK_SETUP(clks, ccu, BCM281XX_AON_CCU_PMU_BSC_VAR, pmu_bsc_var);
307
308 return 0;
309}
310
311static int __init bcm281xx_hub_ccu_clks_setup(struct ccu_data *ccu)
312{
313 struct clk **clks;
314 size_t count = BCM281XX_HUB_CCU_CLOCK_COUNT;
315
316 clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
317 if (!clks) {
318 pr_err("%s: failed to allocate hub clocks\n", __func__);
319 return -ENOMEM;
320 }
321 ccu->data.clks = clks;
322 ccu->data.clk_num = count;
323
324 PERI_CLK_SETUP(clks, ccu, BCM281XX_HUB_CCU_TMON_1M, tmon_1m);
325
326 return 0;
327}
328
329static int __init bcm281xx_master_ccu_clks_setup(struct ccu_data *ccu)
330{
331 struct clk **clks;
332 size_t count = BCM281XX_MASTER_CCU_CLOCK_COUNT;
333
334 clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
335 if (!clks) {
336 pr_err("%s: failed to allocate master clocks\n", __func__);
337 return -ENOMEM;
338 }
339 ccu->data.clks = clks;
340 ccu->data.clk_num = count;
341
342 PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO1, sdio1);
343 PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO2, sdio2);
344 PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO3, sdio3);
345 PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_SDIO4, sdio4);
346 PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_USB_IC, usb_ic);
347 PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_HSIC2_48M, hsic2_48m);
348 PERI_CLK_SETUP(clks, ccu, BCM281XX_MASTER_CCU_HSIC2_12M, hsic2_12m);
349
350 return 0;
351}
352
353static int __init bcm281xx_slave_ccu_clks_setup(struct ccu_data *ccu)
354{
355 struct clk **clks;
356 size_t count = BCM281XX_SLAVE_CCU_CLOCK_COUNT;
357
358 clks = kzalloc(count * sizeof(*clks), GFP_KERNEL);
359 if (!clks) {
360 pr_err("%s: failed to allocate slave clocks\n", __func__);
361 return -ENOMEM;
362 }
363 ccu->data.clks = clks;
364 ccu->data.clk_num = count;
365
366 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB, uartb);
367 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB2, uartb2);
368 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB3, uartb3);
369 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_UARTB4, uartb4);
370 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_SSP0, ssp0);
371 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_SSP2, ssp2);
372 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC1, bsc1);
373 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC2, bsc2);
374 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_BSC3, bsc3);
375 PERI_CLK_SETUP(clks, ccu, BCM281XX_SLAVE_CCU_PWM, pwm);
376
377 return 0;
378}
379
380/* Device tree match table callback functions */
381
382static void __init kona_dt_root_ccu_setup(struct device_node *node)
383{
384 kona_dt_ccu_setup(node, bcm281xx_root_ccu_clks_setup);
385}
386
387static void __init kona_dt_aon_ccu_setup(struct device_node *node)
388{
389 kona_dt_ccu_setup(node, bcm281xx_aon_ccu_clks_setup);
390}
391
392static void __init kona_dt_hub_ccu_setup(struct device_node *node)
393{
394 kona_dt_ccu_setup(node, bcm281xx_hub_ccu_clks_setup);
395}
396
397static void __init kona_dt_master_ccu_setup(struct device_node *node)
398{
399 kona_dt_ccu_setup(node, bcm281xx_master_ccu_clks_setup);
400}
401
402static void __init kona_dt_slave_ccu_setup(struct device_node *node)
403{
404 kona_dt_ccu_setup(node, bcm281xx_slave_ccu_clks_setup);
405}
406
407CLK_OF_DECLARE(bcm11351_root_ccu, BCM11351_DT_ROOT_CCU_COMPAT,
408 kona_dt_root_ccu_setup);
409CLK_OF_DECLARE(bcm11351_aon_ccu, BCM11351_DT_AON_CCU_COMPAT,
410 kona_dt_aon_ccu_setup);
411CLK_OF_DECLARE(bcm11351_hub_ccu, BCM11351_DT_HUB_CCU_COMPAT,
412 kona_dt_hub_ccu_setup);
413CLK_OF_DECLARE(bcm11351_master_ccu, BCM11351_DT_MASTER_CCU_COMPAT,
414 kona_dt_master_ccu_setup);
415CLK_OF_DECLARE(bcm11351_slave_ccu, BCM11351_DT_SLAVE_CCU_COMPAT,
416 kona_dt_slave_ccu_setup);
diff --git a/drivers/clk/bcm/clk-kona-setup.c b/drivers/clk/bcm/clk-kona-setup.c
new file mode 100644
index 000000000000..c7607feb18dd
--- /dev/null
+++ b/drivers/clk/bcm/clk-kona-setup.c
@@ -0,0 +1,769 @@
1/*
2 * Copyright (C) 2013 Broadcom Corporation
3 * Copyright 2013 Linaro Limited
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation version 2.
8 *
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether express or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include <linux/io.h>
16#include <linux/of_address.h>
17
18#include "clk-kona.h"
19
20/* These are used when a selector or trigger is found to be unneeded */
21#define selector_clear_exists(sel) ((sel)->width = 0)
22#define trigger_clear_exists(trig) FLAG_CLEAR(trig, TRIG, EXISTS)
23
24LIST_HEAD(ccu_list); /* The list of set up CCUs */
25
26/* Validity checking */
27
28static bool clk_requires_trigger(struct kona_clk *bcm_clk)
29{
30 struct peri_clk_data *peri = bcm_clk->peri;
31 struct bcm_clk_sel *sel;
32 struct bcm_clk_div *div;
33
34 if (bcm_clk->type != bcm_clk_peri)
35 return false;
36
37 sel = &peri->sel;
38 if (sel->parent_count && selector_exists(sel))
39 return true;
40
41 div = &peri->div;
42 if (!divider_exists(div))
43 return false;
44
45 /* Fixed dividers don't need triggers */
46 if (!divider_is_fixed(div))
47 return true;
48
49 div = &peri->pre_div;
50
51 return divider_exists(div) && !divider_is_fixed(div);
52}
53
54static bool peri_clk_data_offsets_valid(struct kona_clk *bcm_clk)
55{
56 struct peri_clk_data *peri;
57 struct bcm_clk_gate *gate;
58 struct bcm_clk_div *div;
59 struct bcm_clk_sel *sel;
60 struct bcm_clk_trig *trig;
61 const char *name;
62 u32 range;
63 u32 limit;
64
65 BUG_ON(bcm_clk->type != bcm_clk_peri);
66 peri = bcm_clk->peri;
67 name = bcm_clk->name;
68 range = bcm_clk->ccu->range;
69
70 limit = range - sizeof(u32);
71 limit = round_down(limit, sizeof(u32));
72
73 gate = &peri->gate;
74 if (gate_exists(gate)) {
75 if (gate->offset > limit) {
76 pr_err("%s: bad gate offset for %s (%u > %u)\n",
77 __func__, name, gate->offset, limit);
78 return false;
79 }
80 }
81
82 div = &peri->div;
83 if (divider_exists(div)) {
84 if (div->offset > limit) {
85 pr_err("%s: bad divider offset for %s (%u > %u)\n",
86 __func__, name, div->offset, limit);
87 return false;
88 }
89 }
90
91 div = &peri->pre_div;
92 if (divider_exists(div)) {
93 if (div->offset > limit) {
94 pr_err("%s: bad pre-divider offset for %s "
95 "(%u > %u)\n",
96 __func__, name, div->offset, limit);
97 return false;
98 }
99 }
100
101 sel = &peri->sel;
102 if (selector_exists(sel)) {
103 if (sel->offset > limit) {
104 pr_err("%s: bad selector offset for %s (%u > %u)\n",
105 __func__, name, sel->offset, limit);
106 return false;
107 }
108 }
109
110 trig = &peri->trig;
111 if (trigger_exists(trig)) {
112 if (trig->offset > limit) {
113 pr_err("%s: bad trigger offset for %s (%u > %u)\n",
114 __func__, name, trig->offset, limit);
115 return false;
116 }
117 }
118
119 trig = &peri->pre_trig;
120 if (trigger_exists(trig)) {
121 if (trig->offset > limit) {
122 pr_err("%s: bad pre-trigger offset for %s (%u > %u)\n",
123 __func__, name, trig->offset, limit);
124 return false;
125 }
126 }
127
128 return true;
129}
130
131/* A bit position must be less than the number of bits in a 32-bit register. */
132static bool bit_posn_valid(u32 bit_posn, const char *field_name,
133 const char *clock_name)
134{
135 u32 limit = BITS_PER_BYTE * sizeof(u32) - 1;
136
137 if (bit_posn > limit) {
138 pr_err("%s: bad %s bit for %s (%u > %u)\n", __func__,
139 field_name, clock_name, bit_posn, limit);
140 return false;
141 }
142 return true;
143}
144
145/*
146 * A bitfield must be at least 1 bit wide. Both the low-order and
147 * high-order bits must lie within a 32-bit register. We require
148 * fields to be less than 32 bits wide, mainly because we use
149 * shifting to produce field masks, and shifting a full word width
150 * is not well-defined by the C standard.
151 */
152static bool bitfield_valid(u32 shift, u32 width, const char *field_name,
153 const char *clock_name)
154{
155 u32 limit = BITS_PER_BYTE * sizeof(u32);
156
157 if (!width) {
158 pr_err("%s: bad %s field width 0 for %s\n", __func__,
159 field_name, clock_name);
160 return false;
161 }
162 if (shift + width > limit) {
163 pr_err("%s: bad %s for %s (%u + %u > %u)\n", __func__,
164 field_name, clock_name, shift, width, limit);
165 return false;
166 }
167 return true;
168}
169
170/*
171 * All gates, if defined, have a status bit, and for hardware-only
172 * gates, that's it. Gates that can be software controlled also
173 * have an enable bit. And a gate that can be hardware or software
174 * controlled will have a hardware/software select bit.
175 */
176static bool gate_valid(struct bcm_clk_gate *gate, const char *field_name,
177 const char *clock_name)
178{
179 if (!bit_posn_valid(gate->status_bit, "gate status", clock_name))
180 return false;
181
182 if (gate_is_sw_controllable(gate)) {
183 if (!bit_posn_valid(gate->en_bit, "gate enable", clock_name))
184 return false;
185
186 if (gate_is_hw_controllable(gate)) {
187 if (!bit_posn_valid(gate->hw_sw_sel_bit,
188 "gate hw/sw select",
189 clock_name))
190 return false;
191 }
192 } else {
193 BUG_ON(!gate_is_hw_controllable(gate));
194 }
195
196 return true;
197}
198
199/*
200 * A selector bitfield must be valid. Its parent_sel array must
201 * also be reasonable for the field.
202 */
203static bool sel_valid(struct bcm_clk_sel *sel, const char *field_name,
204 const char *clock_name)
205{
206 if (!bitfield_valid(sel->shift, sel->width, field_name, clock_name))
207 return false;
208
209 if (sel->parent_count) {
210 u32 max_sel;
211 u32 limit;
212
213 /*
214 * Make sure the selector field can hold all the
215 * selector values we expect to be able to use. A
216 * clock only needs to have a selector defined if it
217 * has more than one parent. And in that case the
218 * highest selector value will be in the last entry
219 * in the array.
220 */
221 max_sel = sel->parent_sel[sel->parent_count - 1];
222 limit = (1 << sel->width) - 1;
223 if (max_sel > limit) {
224 pr_err("%s: bad selector for %s "
225 "(%u needs > %u bits)\n",
226 __func__, clock_name, max_sel,
227 sel->width);
228 return false;
229 }
230 } else {
231 pr_warn("%s: ignoring selector for %s (no parents)\n",
232 __func__, clock_name);
233 selector_clear_exists(sel);
234 kfree(sel->parent_sel);
235 sel->parent_sel = NULL;
236 }
237
238 return true;
239}
240
241/*
242 * A fixed divider just needs to be non-zero. A variable divider
243 * has to have a valid divider bitfield, and if it has a fraction,
244 * the width of the fraction must not be no more than the width of
245 * the divider as a whole.
246 */
247static bool div_valid(struct bcm_clk_div *div, const char *field_name,
248 const char *clock_name)
249{
250 if (divider_is_fixed(div)) {
251 /* Any fixed divider value but 0 is OK */
252 if (div->fixed == 0) {
253 pr_err("%s: bad %s fixed value 0 for %s\n", __func__,
254 field_name, clock_name);
255 return false;
256 }
257 return true;
258 }
259 if (!bitfield_valid(div->shift, div->width, field_name, clock_name))
260 return false;
261
262 if (divider_has_fraction(div))
263 if (div->frac_width > div->width) {
264 pr_warn("%s: bad %s fraction width for %s (%u > %u)\n",
265 __func__, field_name, clock_name,
266 div->frac_width, div->width);
267 return false;
268 }
269
270 return true;
271}
272
273/*
274 * If a clock has two dividers, the combined number of fractional
275 * bits must be representable in a 32-bit unsigned value. This
276 * is because we scale up a dividend using both dividers before
277 * dividing to improve accuracy, and we need to avoid overflow.
278 */
279static bool kona_dividers_valid(struct kona_clk *bcm_clk)
280{
281 struct peri_clk_data *peri = bcm_clk->peri;
282 struct bcm_clk_div *div;
283 struct bcm_clk_div *pre_div;
284 u32 limit;
285
286 BUG_ON(bcm_clk->type != bcm_clk_peri);
287
288 if (!divider_exists(&peri->div) || !divider_exists(&peri->pre_div))
289 return true;
290
291 div = &peri->div;
292 pre_div = &peri->pre_div;
293 if (divider_is_fixed(div) || divider_is_fixed(pre_div))
294 return true;
295
296 limit = BITS_PER_BYTE * sizeof(u32);
297
298 return div->frac_width + pre_div->frac_width <= limit;
299}
300
301
302/* A trigger just needs to represent a valid bit position */
303static bool trig_valid(struct bcm_clk_trig *trig, const char *field_name,
304 const char *clock_name)
305{
306 return bit_posn_valid(trig->bit, field_name, clock_name);
307}
308
309/* Determine whether the set of peripheral clock registers are valid. */
310static bool
311peri_clk_data_valid(struct kona_clk *bcm_clk)
312{
313 struct peri_clk_data *peri;
314 struct bcm_clk_gate *gate;
315 struct bcm_clk_sel *sel;
316 struct bcm_clk_div *div;
317 struct bcm_clk_div *pre_div;
318 struct bcm_clk_trig *trig;
319 const char *name;
320
321 BUG_ON(bcm_clk->type != bcm_clk_peri);
322
323 /*
324 * First validate register offsets. This is the only place
325 * where we need something from the ccu, so we do these
326 * together.
327 */
328 if (!peri_clk_data_offsets_valid(bcm_clk))
329 return false;
330
331 peri = bcm_clk->peri;
332 name = bcm_clk->name;
333 gate = &peri->gate;
334 if (gate_exists(gate) && !gate_valid(gate, "gate", name))
335 return false;
336
337 sel = &peri->sel;
338 if (selector_exists(sel)) {
339 if (!sel_valid(sel, "selector", name))
340 return false;
341
342 } else if (sel->parent_count > 1) {
343 pr_err("%s: multiple parents but no selector for %s\n",
344 __func__, name);
345
346 return false;
347 }
348
349 div = &peri->div;
350 pre_div = &peri->pre_div;
351 if (divider_exists(div)) {
352 if (!div_valid(div, "divider", name))
353 return false;
354
355 if (divider_exists(pre_div))
356 if (!div_valid(pre_div, "pre-divider", name))
357 return false;
358 } else if (divider_exists(pre_div)) {
359 pr_err("%s: pre-divider but no divider for %s\n", __func__,
360 name);
361 return false;
362 }
363
364 trig = &peri->trig;
365 if (trigger_exists(trig)) {
366 if (!trig_valid(trig, "trigger", name))
367 return false;
368
369 if (trigger_exists(&peri->pre_trig)) {
370 if (!trig_valid(trig, "pre-trigger", name)) {
371 return false;
372 }
373 }
374 if (!clk_requires_trigger(bcm_clk)) {
375 pr_warn("%s: ignoring trigger for %s (not needed)\n",
376 __func__, name);
377 trigger_clear_exists(trig);
378 }
379 } else if (trigger_exists(&peri->pre_trig)) {
380 pr_err("%s: pre-trigger but no trigger for %s\n", __func__,
381 name);
382 return false;
383 } else if (clk_requires_trigger(bcm_clk)) {
384 pr_err("%s: required trigger missing for %s\n", __func__,
385 name);
386 return false;
387 }
388
389 return kona_dividers_valid(bcm_clk);
390}
391
392static bool kona_clk_valid(struct kona_clk *bcm_clk)
393{
394 switch (bcm_clk->type) {
395 case bcm_clk_peri:
396 if (!peri_clk_data_valid(bcm_clk))
397 return false;
398 break;
399 default:
400 pr_err("%s: unrecognized clock type (%d)\n", __func__,
401 (int)bcm_clk->type);
402 return false;
403 }
404 return true;
405}
406
407/*
408 * Scan an array of parent clock names to determine whether there
409 * are any entries containing BAD_CLK_NAME. Such entries are
410 * placeholders for non-supported clocks. Keep track of the
411 * position of each clock name in the original array.
412 *
413 * Allocates an array of pointers to to hold the names of all
414 * non-null entries in the original array, and returns a pointer to
415 * that array in *names. This will be used for registering the
416 * clock with the common clock code. On successful return,
417 * *count indicates how many entries are in that names array.
418 *
419 * If there is more than one entry in the resulting names array,
420 * another array is allocated to record the parent selector value
421 * for each (defined) parent clock. This is the value that
422 * represents this parent clock in the clock's source selector
423 * register. The position of the clock in the original parent array
424 * defines that selector value. The number of entries in this array
425 * is the same as the number of entries in the parent names array.
426 *
427 * The array of selector values is returned. If the clock has no
428 * parents, no selector is required and a null pointer is returned.
429 *
430 * Returns a null pointer if the clock names array supplied was
431 * null. (This is not an error.)
432 *
433 * Returns a pointer-coded error if an error occurs.
434 */
435static u32 *parent_process(const char *clocks[],
436 u32 *count, const char ***names)
437{
438 static const char **parent_names;
439 static u32 *parent_sel;
440 const char **clock;
441 u32 parent_count;
442 u32 bad_count = 0;
443 u32 orig_count;
444 u32 i;
445 u32 j;
446
447 *count = 0; /* In case of early return */
448 *names = NULL;
449 if (!clocks)
450 return NULL;
451
452 /*
453 * Count the number of names in the null-terminated array,
454 * and find out how many of those are actually clock names.
455 */
456 for (clock = clocks; *clock; clock++)
457 if (*clock == BAD_CLK_NAME)
458 bad_count++;
459 orig_count = (u32)(clock - clocks);
460 parent_count = orig_count - bad_count;
461
462 /* If all clocks are unsupported, we treat it as no clock */
463 if (!parent_count)
464 return NULL;
465
466 /* Avoid exceeding our parent clock limit */
467 if (parent_count > PARENT_COUNT_MAX) {
468 pr_err("%s: too many parents (%u > %u)\n", __func__,
469 parent_count, PARENT_COUNT_MAX);
470 return ERR_PTR(-EINVAL);
471 }
472
473 /*
474 * There is one parent name for each defined parent clock.
475 * We also maintain an array containing the selector value
476 * for each defined clock. If there's only one clock, the
477 * selector is not required, but we allocate space for the
478 * array anyway to keep things simple.
479 */
480 parent_names = kmalloc(parent_count * sizeof(parent_names), GFP_KERNEL);
481 if (!parent_names) {
482 pr_err("%s: error allocating %u parent names\n", __func__,
483 parent_count);
484 return ERR_PTR(-ENOMEM);
485 }
486
487 /* There is at least one parent, so allocate a selector array */
488
489 parent_sel = kmalloc(parent_count * sizeof(*parent_sel), GFP_KERNEL);
490 if (!parent_sel) {
491 pr_err("%s: error allocating %u parent selectors\n", __func__,
492 parent_count);
493 kfree(parent_names);
494
495 return ERR_PTR(-ENOMEM);
496 }
497
498 /* Now fill in the parent names and selector arrays */
499 for (i = 0, j = 0; i < orig_count; i++) {
500 if (clocks[i] != BAD_CLK_NAME) {
501 parent_names[j] = clocks[i];
502 parent_sel[j] = i;
503 j++;
504 }
505 }
506 *names = parent_names;
507 *count = parent_count;
508
509 return parent_sel;
510}
511
512static int
513clk_sel_setup(const char **clocks, struct bcm_clk_sel *sel,
514 struct clk_init_data *init_data)
515{
516 const char **parent_names = NULL;
517 u32 parent_count = 0;
518 u32 *parent_sel;
519
520 /*
521 * If a peripheral clock has multiple parents, the value
522 * used by the hardware to select that parent is represented
523 * by the parent clock's position in the "clocks" list. Some
524 * values don't have defined or supported clocks; these will
525 * have BAD_CLK_NAME entries in the parents[] array. The
526 * list is terminated by a NULL entry.
527 *
528 * We need to supply (only) the names of defined parent
529 * clocks when registering a clock though, so we use an
530 * array of parent selector values to map between the
531 * indexes the common clock code uses and the selector
532 * values we need.
533 */
534 parent_sel = parent_process(clocks, &parent_count, &parent_names);
535 if (IS_ERR(parent_sel)) {
536 int ret = PTR_ERR(parent_sel);
537
538 pr_err("%s: error processing parent clocks for %s (%d)\n",
539 __func__, init_data->name, ret);
540
541 return ret;
542 }
543
544 init_data->parent_names = parent_names;
545 init_data->num_parents = parent_count;
546
547 sel->parent_count = parent_count;
548 sel->parent_sel = parent_sel;
549
550 return 0;
551}
552
553static void clk_sel_teardown(struct bcm_clk_sel *sel,
554 struct clk_init_data *init_data)
555{
556 kfree(sel->parent_sel);
557 sel->parent_sel = NULL;
558 sel->parent_count = 0;
559
560 init_data->num_parents = 0;
561 kfree(init_data->parent_names);
562 init_data->parent_names = NULL;
563}
564
565static void peri_clk_teardown(struct peri_clk_data *data,
566 struct clk_init_data *init_data)
567{
568 clk_sel_teardown(&data->sel, init_data);
569 init_data->ops = NULL;
570}
571
572/*
573 * Caller is responsible for freeing the parent_names[] and
574 * parent_sel[] arrays in the peripheral clock's "data" structure
575 * that can be assigned if the clock has one or more parent clocks
576 * associated with it.
577 */
578static int peri_clk_setup(struct ccu_data *ccu, struct peri_clk_data *data,
579 struct clk_init_data *init_data)
580{
581 init_data->ops = &kona_peri_clk_ops;
582 init_data->flags = CLK_IGNORE_UNUSED;
583
584 return clk_sel_setup(data->clocks, &data->sel, init_data);
585}
586
587static void bcm_clk_teardown(struct kona_clk *bcm_clk)
588{
589 switch (bcm_clk->type) {
590 case bcm_clk_peri:
591 peri_clk_teardown(bcm_clk->data, &bcm_clk->init_data);
592 break;
593 default:
594 break;
595 }
596 bcm_clk->data = NULL;
597 bcm_clk->type = bcm_clk_none;
598}
599
600static void kona_clk_teardown(struct clk *clk)
601{
602 struct clk_hw *hw;
603 struct kona_clk *bcm_clk;
604
605 if (!clk)
606 return;
607
608 hw = __clk_get_hw(clk);
609 if (!hw) {
610 pr_err("%s: clk %p has null hw pointer\n", __func__, clk);
611 return;
612 }
613 clk_unregister(clk);
614
615 bcm_clk = to_kona_clk(hw);
616 bcm_clk_teardown(bcm_clk);
617}
618
619struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
620 enum bcm_clk_type type, void *data)
621{
622 struct kona_clk *bcm_clk;
623 struct clk_init_data *init_data;
624 struct clk *clk = NULL;
625
626 bcm_clk = kzalloc(sizeof(*bcm_clk), GFP_KERNEL);
627 if (!bcm_clk) {
628 pr_err("%s: failed to allocate bcm_clk for %s\n", __func__,
629 name);
630 return NULL;
631 }
632 bcm_clk->ccu = ccu;
633 bcm_clk->name = name;
634
635 init_data = &bcm_clk->init_data;
636 init_data->name = name;
637 switch (type) {
638 case bcm_clk_peri:
639 if (peri_clk_setup(ccu, data, init_data))
640 goto out_free;
641 break;
642 default:
643 data = NULL;
644 break;
645 }
646 bcm_clk->type = type;
647 bcm_clk->data = data;
648
649 /* Make sure everything makes sense before we set it up */
650 if (!kona_clk_valid(bcm_clk)) {
651 pr_err("%s: clock data invalid for %s\n", __func__, name);
652 goto out_teardown;
653 }
654
655 bcm_clk->hw.init = init_data;
656 clk = clk_register(NULL, &bcm_clk->hw);
657 if (IS_ERR(clk)) {
658 pr_err("%s: error registering clock %s (%ld)\n", __func__,
659 name, PTR_ERR(clk));
660 goto out_teardown;
661 }
662 BUG_ON(!clk);
663
664 return clk;
665out_teardown:
666 bcm_clk_teardown(bcm_clk);
667out_free:
668 kfree(bcm_clk);
669
670 return NULL;
671}
672
673static void ccu_clks_teardown(struct ccu_data *ccu)
674{
675 u32 i;
676
677 for (i = 0; i < ccu->data.clk_num; i++)
678 kona_clk_teardown(ccu->data.clks[i]);
679 kfree(ccu->data.clks);
680}
681
682static void kona_ccu_teardown(struct ccu_data *ccu)
683{
684 if (!ccu)
685 return;
686
687 if (!ccu->base)
688 goto done;
689
690 of_clk_del_provider(ccu->node); /* safe if never added */
691 ccu_clks_teardown(ccu);
692 list_del(&ccu->links);
693 of_node_put(ccu->node);
694 iounmap(ccu->base);
695done:
696 kfree(ccu->name);
697 kfree(ccu);
698}
699
700/*
701 * Set up a CCU. Call the provided ccu_clks_setup callback to
702 * initialize the array of clocks provided by the CCU.
703 */
704void __init kona_dt_ccu_setup(struct device_node *node,
705 int (*ccu_clks_setup)(struct ccu_data *))
706{
707 struct ccu_data *ccu;
708 struct resource res = { 0 };
709 resource_size_t range;
710 int ret;
711
712 ccu = kzalloc(sizeof(*ccu), GFP_KERNEL);
713 if (ccu)
714 ccu->name = kstrdup(node->name, GFP_KERNEL);
715 if (!ccu || !ccu->name) {
716 pr_err("%s: unable to allocate CCU struct for %s\n",
717 __func__, node->name);
718 kfree(ccu);
719
720 return;
721 }
722
723 ret = of_address_to_resource(node, 0, &res);
724 if (ret) {
725 pr_err("%s: no valid CCU registers found for %s\n", __func__,
726 node->name);
727 goto out_err;
728 }
729
730 range = resource_size(&res);
731 if (range > (resource_size_t)U32_MAX) {
732 pr_err("%s: address range too large for %s\n", __func__,
733 node->name);
734 goto out_err;
735 }
736
737 ccu->range = (u32)range;
738 ccu->base = ioremap(res.start, ccu->range);
739 if (!ccu->base) {
740 pr_err("%s: unable to map CCU registers for %s\n", __func__,
741 node->name);
742 goto out_err;
743 }
744
745 spin_lock_init(&ccu->lock);
746 INIT_LIST_HEAD(&ccu->links);
747 ccu->node = of_node_get(node);
748
749 list_add_tail(&ccu->links, &ccu_list);
750
751 /* Set up clocks array (in ccu->data) */
752 if (ccu_clks_setup(ccu))
753 goto out_err;
754
755 ret = of_clk_add_provider(node, of_clk_src_onecell_get, &ccu->data);
756 if (ret) {
757 pr_err("%s: error adding ccu %s as provider (%d)\n", __func__,
758 node->name, ret);
759 goto out_err;
760 }
761
762 if (!kona_ccu_init(ccu))
763 pr_err("Broadcom %s initialization had errors\n", node->name);
764
765 return;
766out_err:
767 kona_ccu_teardown(ccu);
768 pr_err("Broadcom %s setup aborted\n", node->name);
769}
diff --git a/drivers/clk/bcm/clk-kona.c b/drivers/clk/bcm/clk-kona.c
new file mode 100644
index 000000000000..e3d339e08309
--- /dev/null
+++ b/drivers/clk/bcm/clk-kona.c
@@ -0,0 +1,1033 @@
1/*
2 * Copyright (C) 2013 Broadcom Corporation
3 * Copyright 2013 Linaro Limited
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation version 2.
8 *
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether express or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#include "clk-kona.h"
16
17#include <linux/delay.h>
18
19#define CCU_ACCESS_PASSWORD 0xA5A500
20#define CLK_GATE_DELAY_LOOP 2000
21
22/* Bitfield operations */
23
24/* Produces a mask of set bits covering a range of a 32-bit value */
25static inline u32 bitfield_mask(u32 shift, u32 width)
26{
27 return ((1 << width) - 1) << shift;
28}
29
30/* Extract the value of a bitfield found within a given register value */
31static inline u32 bitfield_extract(u32 reg_val, u32 shift, u32 width)
32{
33 return (reg_val & bitfield_mask(shift, width)) >> shift;
34}
35
36/* Replace the value of a bitfield found within a given register value */
37static inline u32 bitfield_replace(u32 reg_val, u32 shift, u32 width, u32 val)
38{
39 u32 mask = bitfield_mask(shift, width);
40
41 return (reg_val & ~mask) | (val << shift);
42}
43
44/* Divider and scaling helpers */
45
46/*
47 * Implement DIV_ROUND_CLOSEST() for 64-bit dividend and both values
48 * unsigned. Note that unlike do_div(), the remainder is discarded
49 * and the return value is the quotient (not the remainder).
50 */
51u64 do_div_round_closest(u64 dividend, unsigned long divisor)
52{
53 u64 result;
54
55 result = dividend + ((u64)divisor >> 1);
56 (void)do_div(result, divisor);
57
58 return result;
59}
60
61/* Convert a divider into the scaled divisor value it represents. */
62static inline u64 scaled_div_value(struct bcm_clk_div *div, u32 reg_div)
63{
64 return (u64)reg_div + ((u64)1 << div->frac_width);
65}
66
67/*
68 * Build a scaled divider value as close as possible to the
69 * given whole part (div_value) and fractional part (expressed
70 * in billionths).
71 */
72u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value, u32 billionths)
73{
74 u64 combined;
75
76 BUG_ON(!div_value);
77 BUG_ON(billionths >= BILLION);
78
79 combined = (u64)div_value * BILLION + billionths;
80 combined <<= div->frac_width;
81
82 return do_div_round_closest(combined, BILLION);
83}
84
85/* The scaled minimum divisor representable by a divider */
86static inline u64
87scaled_div_min(struct bcm_clk_div *div)
88{
89 if (divider_is_fixed(div))
90 return (u64)div->fixed;
91
92 return scaled_div_value(div, 0);
93}
94
95/* The scaled maximum divisor representable by a divider */
96u64 scaled_div_max(struct bcm_clk_div *div)
97{
98 u32 reg_div;
99
100 if (divider_is_fixed(div))
101 return (u64)div->fixed;
102
103 reg_div = ((u32)1 << div->width) - 1;
104
105 return scaled_div_value(div, reg_div);
106}
107
108/*
109 * Convert a scaled divisor into its divider representation as
110 * stored in a divider register field.
111 */
112static inline u32
113divider(struct bcm_clk_div *div, u64 scaled_div)
114{
115 BUG_ON(scaled_div < scaled_div_min(div));
116 BUG_ON(scaled_div > scaled_div_max(div));
117
118 return (u32)(scaled_div - ((u64)1 << div->frac_width));
119}
120
121/* Return a rate scaled for use when dividing by a scaled divisor. */
122static inline u64
123scale_rate(struct bcm_clk_div *div, u32 rate)
124{
125 if (divider_is_fixed(div))
126 return (u64)rate;
127
128 return (u64)rate << div->frac_width;
129}
130
131/* CCU access */
132
133/* Read a 32-bit register value from a CCU's address space. */
134static inline u32 __ccu_read(struct ccu_data *ccu, u32 reg_offset)
135{
136 return readl(ccu->base + reg_offset);
137}
138
139/* Write a 32-bit register value into a CCU's address space. */
140static inline void
141__ccu_write(struct ccu_data *ccu, u32 reg_offset, u32 reg_val)
142{
143 writel(reg_val, ccu->base + reg_offset);
144}
145
146static inline unsigned long ccu_lock(struct ccu_data *ccu)
147{
148 unsigned long flags;
149
150 spin_lock_irqsave(&ccu->lock, flags);
151
152 return flags;
153}
154static inline void ccu_unlock(struct ccu_data *ccu, unsigned long flags)
155{
156 spin_unlock_irqrestore(&ccu->lock, flags);
157}
158
159/*
160 * Enable/disable write access to CCU protected registers. The
161 * WR_ACCESS register for all CCUs is at offset 0.
162 */
163static inline void __ccu_write_enable(struct ccu_data *ccu)
164{
165 if (ccu->write_enabled) {
166 pr_err("%s: access already enabled for %s\n", __func__,
167 ccu->name);
168 return;
169 }
170 ccu->write_enabled = true;
171 __ccu_write(ccu, 0, CCU_ACCESS_PASSWORD | 1);
172}
173
174static inline void __ccu_write_disable(struct ccu_data *ccu)
175{
176 if (!ccu->write_enabled) {
177 pr_err("%s: access wasn't enabled for %s\n", __func__,
178 ccu->name);
179 return;
180 }
181
182 __ccu_write(ccu, 0, CCU_ACCESS_PASSWORD);
183 ccu->write_enabled = false;
184}
185
186/*
187 * Poll a register in a CCU's address space, returning when the
188 * specified bit in that register's value is set (or clear). Delay
189 * a microsecond after each read of the register. Returns true if
190 * successful, or false if we gave up trying.
191 *
192 * Caller must ensure the CCU lock is held.
193 */
194static inline bool
195__ccu_wait_bit(struct ccu_data *ccu, u32 reg_offset, u32 bit, bool want)
196{
197 unsigned int tries;
198 u32 bit_mask = 1 << bit;
199
200 for (tries = 0; tries < CLK_GATE_DELAY_LOOP; tries++) {
201 u32 val;
202 bool bit_val;
203
204 val = __ccu_read(ccu, reg_offset);
205 bit_val = (val & bit_mask) != 0;
206 if (bit_val == want)
207 return true;
208 udelay(1);
209 }
210 return false;
211}
212
213/* Gate operations */
214
215/* Determine whether a clock is gated. CCU lock must be held. */
216static bool
217__is_clk_gate_enabled(struct ccu_data *ccu, struct bcm_clk_gate *gate)
218{
219 u32 bit_mask;
220 u32 reg_val;
221
222 /* If there is no gate we can assume it's enabled. */
223 if (!gate_exists(gate))
224 return true;
225
226 bit_mask = 1 << gate->status_bit;
227 reg_val = __ccu_read(ccu, gate->offset);
228
229 return (reg_val & bit_mask) != 0;
230}
231
232/* Determine whether a clock is gated. */
233static bool
234is_clk_gate_enabled(struct ccu_data *ccu, struct bcm_clk_gate *gate)
235{
236 long flags;
237 bool ret;
238
239 /* Avoid taking the lock if we can */
240 if (!gate_exists(gate))
241 return true;
242
243 flags = ccu_lock(ccu);
244 ret = __is_clk_gate_enabled(ccu, gate);
245 ccu_unlock(ccu, flags);
246
247 return ret;
248}
249
250/*
251 * Commit our desired gate state to the hardware.
252 * Returns true if successful, false otherwise.
253 */
254static bool
255__gate_commit(struct ccu_data *ccu, struct bcm_clk_gate *gate)
256{
257 u32 reg_val;
258 u32 mask;
259 bool enabled = false;
260
261 BUG_ON(!gate_exists(gate));
262 if (!gate_is_sw_controllable(gate))
263 return true; /* Nothing we can change */
264
265 reg_val = __ccu_read(ccu, gate->offset);
266
267 /* For a hardware/software gate, set which is in control */
268 if (gate_is_hw_controllable(gate)) {
269 mask = (u32)1 << gate->hw_sw_sel_bit;
270 if (gate_is_sw_managed(gate))
271 reg_val |= mask;
272 else
273 reg_val &= ~mask;
274 }
275
276 /*
277 * If software is in control, enable or disable the gate.
278 * If hardware is, clear the enabled bit for good measure.
279 * If a software controlled gate can't be disabled, we're
280 * required to write a 0 into the enable bit (but the gate
281 * will be enabled).
282 */
283 mask = (u32)1 << gate->en_bit;
284 if (gate_is_sw_managed(gate) && (enabled = gate_is_enabled(gate)) &&
285 !gate_is_no_disable(gate))
286 reg_val |= mask;
287 else
288 reg_val &= ~mask;
289
290 __ccu_write(ccu, gate->offset, reg_val);
291
292 /* For a hardware controlled gate, we're done */
293 if (!gate_is_sw_managed(gate))
294 return true;
295
296 /* Otherwise wait for the gate to be in desired state */
297 return __ccu_wait_bit(ccu, gate->offset, gate->status_bit, enabled);
298}
299
300/*
301 * Initialize a gate. Our desired state (hardware/software select,
302 * and if software, its enable state) is committed to hardware
303 * without the usual checks to see if it's already set up that way.
304 * Returns true if successful, false otherwise.
305 */
306static bool gate_init(struct ccu_data *ccu, struct bcm_clk_gate *gate)
307{
308 if (!gate_exists(gate))
309 return true;
310 return __gate_commit(ccu, gate);
311}
312
313/*
314 * Set a gate to enabled or disabled state. Does nothing if the
315 * gate is not currently under software control, or if it is already
316 * in the requested state. Returns true if successful, false
317 * otherwise. CCU lock must be held.
318 */
319static bool
320__clk_gate(struct ccu_data *ccu, struct bcm_clk_gate *gate, bool enable)
321{
322 bool ret;
323
324 if (!gate_exists(gate) || !gate_is_sw_managed(gate))
325 return true; /* Nothing to do */
326
327 if (!enable && gate_is_no_disable(gate)) {
328 pr_warn("%s: invalid gate disable request (ignoring)\n",
329 __func__);
330 return true;
331 }
332
333 if (enable == gate_is_enabled(gate))
334 return true; /* No change */
335
336 gate_flip_enabled(gate);
337 ret = __gate_commit(ccu, gate);
338 if (!ret)
339 gate_flip_enabled(gate); /* Revert the change */
340
341 return ret;
342}
343
344/* Enable or disable a gate. Returns 0 if successful, -EIO otherwise */
345static int clk_gate(struct ccu_data *ccu, const char *name,
346 struct bcm_clk_gate *gate, bool enable)
347{
348 unsigned long flags;
349 bool success;
350
351 /*
352 * Avoid taking the lock if we can. We quietly ignore
353 * requests to change state that don't make sense.
354 */
355 if (!gate_exists(gate) || !gate_is_sw_managed(gate))
356 return 0;
357 if (!enable && gate_is_no_disable(gate))
358 return 0;
359
360 flags = ccu_lock(ccu);
361 __ccu_write_enable(ccu);
362
363 success = __clk_gate(ccu, gate, enable);
364
365 __ccu_write_disable(ccu);
366 ccu_unlock(ccu, flags);
367
368 if (success)
369 return 0;
370
371 pr_err("%s: failed to %s gate for %s\n", __func__,
372 enable ? "enable" : "disable", name);
373
374 return -EIO;
375}
376
377/* Trigger operations */
378
379/*
380 * Caller must ensure CCU lock is held and access is enabled.
381 * Returns true if successful, false otherwise.
382 */
383static bool __clk_trigger(struct ccu_data *ccu, struct bcm_clk_trig *trig)
384{
385 /* Trigger the clock and wait for it to finish */
386 __ccu_write(ccu, trig->offset, 1 << trig->bit);
387
388 return __ccu_wait_bit(ccu, trig->offset, trig->bit, false);
389}
390
391/* Divider operations */
392
393/* Read a divider value and return the scaled divisor it represents. */
394static u64 divider_read_scaled(struct ccu_data *ccu, struct bcm_clk_div *div)
395{
396 unsigned long flags;
397 u32 reg_val;
398 u32 reg_div;
399
400 if (divider_is_fixed(div))
401 return (u64)div->fixed;
402
403 flags = ccu_lock(ccu);
404 reg_val = __ccu_read(ccu, div->offset);
405 ccu_unlock(ccu, flags);
406
407 /* Extract the full divider field from the register value */
408 reg_div = bitfield_extract(reg_val, div->shift, div->width);
409
410 /* Return the scaled divisor value it represents */
411 return scaled_div_value(div, reg_div);
412}
413
414/*
415 * Convert a divider's scaled divisor value into its recorded form
416 * and commit it into the hardware divider register.
417 *
418 * Returns 0 on success. Returns -EINVAL for invalid arguments.
419 * Returns -ENXIO if gating failed, and -EIO if a trigger failed.
420 */
421static int __div_commit(struct ccu_data *ccu, struct bcm_clk_gate *gate,
422 struct bcm_clk_div *div, struct bcm_clk_trig *trig)
423{
424 bool enabled;
425 u32 reg_div;
426 u32 reg_val;
427 int ret = 0;
428
429 BUG_ON(divider_is_fixed(div));
430
431 /*
432 * If we're just initializing the divider, and no initial
433 * state was defined in the device tree, we just find out
434 * what its current value is rather than updating it.
435 */
436 if (div->scaled_div == BAD_SCALED_DIV_VALUE) {
437 reg_val = __ccu_read(ccu, div->offset);
438 reg_div = bitfield_extract(reg_val, div->shift, div->width);
439 div->scaled_div = scaled_div_value(div, reg_div);
440
441 return 0;
442 }
443
444 /* Convert the scaled divisor to the value we need to record */
445 reg_div = divider(div, div->scaled_div);
446
447 /* Clock needs to be enabled before changing the rate */
448 enabled = __is_clk_gate_enabled(ccu, gate);
449 if (!enabled && !__clk_gate(ccu, gate, true)) {
450 ret = -ENXIO;
451 goto out;
452 }
453
454 /* Replace the divider value and record the result */
455 reg_val = __ccu_read(ccu, div->offset);
456 reg_val = bitfield_replace(reg_val, div->shift, div->width, reg_div);
457 __ccu_write(ccu, div->offset, reg_val);
458
459 /* If the trigger fails we still want to disable the gate */
460 if (!__clk_trigger(ccu, trig))
461 ret = -EIO;
462
463 /* Disable the clock again if it was disabled to begin with */
464 if (!enabled && !__clk_gate(ccu, gate, false))
465 ret = ret ? ret : -ENXIO; /* return first error */
466out:
467 return ret;
468}
469
470/*
471 * Initialize a divider by committing our desired state to hardware
472 * without the usual checks to see if it's already set up that way.
473 * Returns true if successful, false otherwise.
474 */
475static bool div_init(struct ccu_data *ccu, struct bcm_clk_gate *gate,
476 struct bcm_clk_div *div, struct bcm_clk_trig *trig)
477{
478 if (!divider_exists(div) || divider_is_fixed(div))
479 return true;
480 return !__div_commit(ccu, gate, div, trig);
481}
482
483static int divider_write(struct ccu_data *ccu, struct bcm_clk_gate *gate,
484 struct bcm_clk_div *div, struct bcm_clk_trig *trig,
485 u64 scaled_div)
486{
487 unsigned long flags;
488 u64 previous;
489 int ret;
490
491 BUG_ON(divider_is_fixed(div));
492
493 previous = div->scaled_div;
494 if (previous == scaled_div)
495 return 0; /* No change */
496
497 div->scaled_div = scaled_div;
498
499 flags = ccu_lock(ccu);
500 __ccu_write_enable(ccu);
501
502 ret = __div_commit(ccu, gate, div, trig);
503
504 __ccu_write_disable(ccu);
505 ccu_unlock(ccu, flags);
506
507 if (ret)
508 div->scaled_div = previous; /* Revert the change */
509
510 return ret;
511
512}
513
514/* Common clock rate helpers */
515
516/*
517 * Implement the common clock framework recalc_rate method, taking
518 * into account a divider and an optional pre-divider. The
519 * pre-divider register pointer may be NULL.
520 */
521static unsigned long clk_recalc_rate(struct ccu_data *ccu,
522 struct bcm_clk_div *div, struct bcm_clk_div *pre_div,
523 unsigned long parent_rate)
524{
525 u64 scaled_parent_rate;
526 u64 scaled_div;
527 u64 result;
528
529 if (!divider_exists(div))
530 return parent_rate;
531
532 if (parent_rate > (unsigned long)LONG_MAX)
533 return 0; /* actually this would be a caller bug */
534
535 /*
536 * If there is a pre-divider, divide the scaled parent rate
537 * by the pre-divider value first. In this case--to improve
538 * accuracy--scale the parent rate by *both* the pre-divider
539 * value and the divider before actually computing the
540 * result of the pre-divider.
541 *
542 * If there's only one divider, just scale the parent rate.
543 */
544 if (pre_div && divider_exists(pre_div)) {
545 u64 scaled_rate;
546
547 scaled_rate = scale_rate(pre_div, parent_rate);
548 scaled_rate = scale_rate(div, scaled_rate);
549 scaled_div = divider_read_scaled(ccu, pre_div);
550 scaled_parent_rate = do_div_round_closest(scaled_rate,
551 scaled_div);
552 } else {
553 scaled_parent_rate = scale_rate(div, parent_rate);
554 }
555
556 /*
557 * Get the scaled divisor value, and divide the scaled
558 * parent rate by that to determine this clock's resulting
559 * rate.
560 */
561 scaled_div = divider_read_scaled(ccu, div);
562 result = do_div_round_closest(scaled_parent_rate, scaled_div);
563
564 return (unsigned long)result;
565}
566
567/*
568 * Compute the output rate produced when a given parent rate is fed
569 * into two dividers. The pre-divider can be NULL, and even if it's
570 * non-null it may be nonexistent. It's also OK for the divider to
571 * be nonexistent, and in that case the pre-divider is also ignored.
572 *
573 * If scaled_div is non-null, it is used to return the scaled divisor
574 * value used by the (downstream) divider to produce that rate.
575 */
576static long round_rate(struct ccu_data *ccu, struct bcm_clk_div *div,
577 struct bcm_clk_div *pre_div,
578 unsigned long rate, unsigned long parent_rate,
579 u64 *scaled_div)
580{
581 u64 scaled_parent_rate;
582 u64 min_scaled_div;
583 u64 max_scaled_div;
584 u64 best_scaled_div;
585 u64 result;
586
587 BUG_ON(!divider_exists(div));
588 BUG_ON(!rate);
589 BUG_ON(parent_rate > (u64)LONG_MAX);
590
591 /*
592 * If there is a pre-divider, divide the scaled parent rate
593 * by the pre-divider value first. In this case--to improve
594 * accuracy--scale the parent rate by *both* the pre-divider
595 * value and the divider before actually computing the
596 * result of the pre-divider.
597 *
598 * If there's only one divider, just scale the parent rate.
599 *
600 * For simplicity we treat the pre-divider as fixed (for now).
601 */
602 if (divider_exists(pre_div)) {
603 u64 scaled_rate;
604 u64 scaled_pre_div;
605
606 scaled_rate = scale_rate(pre_div, parent_rate);
607 scaled_rate = scale_rate(div, scaled_rate);
608 scaled_pre_div = divider_read_scaled(ccu, pre_div);
609 scaled_parent_rate = do_div_round_closest(scaled_rate,
610 scaled_pre_div);
611 } else {
612 scaled_parent_rate = scale_rate(div, parent_rate);
613 }
614
615 /*
616 * Compute the best possible divider and ensure it is in
617 * range. A fixed divider can't be changed, so just report
618 * the best we can do.
619 */
620 if (!divider_is_fixed(div)) {
621 best_scaled_div = do_div_round_closest(scaled_parent_rate,
622 rate);
623 min_scaled_div = scaled_div_min(div);
624 max_scaled_div = scaled_div_max(div);
625 if (best_scaled_div > max_scaled_div)
626 best_scaled_div = max_scaled_div;
627 else if (best_scaled_div < min_scaled_div)
628 best_scaled_div = min_scaled_div;
629 } else {
630 best_scaled_div = divider_read_scaled(ccu, div);
631 }
632
633 /* OK, figure out the resulting rate */
634 result = do_div_round_closest(scaled_parent_rate, best_scaled_div);
635
636 if (scaled_div)
637 *scaled_div = best_scaled_div;
638
639 return (long)result;
640}
641
642/* Common clock parent helpers */
643
644/*
645 * For a given parent selector (register field) value, find the
646 * index into a selector's parent_sel array that contains it.
647 * Returns the index, or BAD_CLK_INDEX if it's not found.
648 */
649static u8 parent_index(struct bcm_clk_sel *sel, u8 parent_sel)
650{
651 u8 i;
652
653 BUG_ON(sel->parent_count > (u32)U8_MAX);
654 for (i = 0; i < sel->parent_count; i++)
655 if (sel->parent_sel[i] == parent_sel)
656 return i;
657 return BAD_CLK_INDEX;
658}
659
660/*
661 * Fetch the current value of the selector, and translate that into
662 * its corresponding index in the parent array we registered with
663 * the clock framework.
664 *
665 * Returns parent array index that corresponds with the value found,
666 * or BAD_CLK_INDEX if the found value is out of range.
667 */
668static u8 selector_read_index(struct ccu_data *ccu, struct bcm_clk_sel *sel)
669{
670 unsigned long flags;
671 u32 reg_val;
672 u32 parent_sel;
673 u8 index;
674
675 /* If there's no selector, there's only one parent */
676 if (!selector_exists(sel))
677 return 0;
678
679 /* Get the value in the selector register */
680 flags = ccu_lock(ccu);
681 reg_val = __ccu_read(ccu, sel->offset);
682 ccu_unlock(ccu, flags);
683
684 parent_sel = bitfield_extract(reg_val, sel->shift, sel->width);
685
686 /* Look up that selector's parent array index and return it */
687 index = parent_index(sel, parent_sel);
688 if (index == BAD_CLK_INDEX)
689 pr_err("%s: out-of-range parent selector %u (%s 0x%04x)\n",
690 __func__, parent_sel, ccu->name, sel->offset);
691
692 return index;
693}
694
695/*
696 * Commit our desired selector value to the hardware.
697 *
698 * Returns 0 on success. Returns -EINVAL for invalid arguments.
699 * Returns -ENXIO if gating failed, and -EIO if a trigger failed.
700 */
701static int
702__sel_commit(struct ccu_data *ccu, struct bcm_clk_gate *gate,
703 struct bcm_clk_sel *sel, struct bcm_clk_trig *trig)
704{
705 u32 parent_sel;
706 u32 reg_val;
707 bool enabled;
708 int ret = 0;
709
710 BUG_ON(!selector_exists(sel));
711
712 /*
713 * If we're just initializing the selector, and no initial
714 * state was defined in the device tree, we just find out
715 * what its current value is rather than updating it.
716 */
717 if (sel->clk_index == BAD_CLK_INDEX) {
718 u8 index;
719
720 reg_val = __ccu_read(ccu, sel->offset);
721 parent_sel = bitfield_extract(reg_val, sel->shift, sel->width);
722 index = parent_index(sel, parent_sel);
723 if (index == BAD_CLK_INDEX)
724 return -EINVAL;
725 sel->clk_index = index;
726
727 return 0;
728 }
729
730 BUG_ON((u32)sel->clk_index >= sel->parent_count);
731 parent_sel = sel->parent_sel[sel->clk_index];
732
733 /* Clock needs to be enabled before changing the parent */
734 enabled = __is_clk_gate_enabled(ccu, gate);
735 if (!enabled && !__clk_gate(ccu, gate, true))
736 return -ENXIO;
737
738 /* Replace the selector value and record the result */
739 reg_val = __ccu_read(ccu, sel->offset);
740 reg_val = bitfield_replace(reg_val, sel->shift, sel->width, parent_sel);
741 __ccu_write(ccu, sel->offset, reg_val);
742
743 /* If the trigger fails we still want to disable the gate */
744 if (!__clk_trigger(ccu, trig))
745 ret = -EIO;
746
747 /* Disable the clock again if it was disabled to begin with */
748 if (!enabled && !__clk_gate(ccu, gate, false))
749 ret = ret ? ret : -ENXIO; /* return first error */
750
751 return ret;
752}
753
754/*
755 * Initialize a selector by committing our desired state to hardware
756 * without the usual checks to see if it's already set up that way.
757 * Returns true if successful, false otherwise.
758 */
759static bool sel_init(struct ccu_data *ccu, struct bcm_clk_gate *gate,
760 struct bcm_clk_sel *sel, struct bcm_clk_trig *trig)
761{
762 if (!selector_exists(sel))
763 return true;
764 return !__sel_commit(ccu, gate, sel, trig);
765}
766
767/*
768 * Write a new value into a selector register to switch to a
769 * different parent clock. Returns 0 on success, or an error code
770 * (from __sel_commit()) otherwise.
771 */
772static int selector_write(struct ccu_data *ccu, struct bcm_clk_gate *gate,
773 struct bcm_clk_sel *sel, struct bcm_clk_trig *trig,
774 u8 index)
775{
776 unsigned long flags;
777 u8 previous;
778 int ret;
779
780 previous = sel->clk_index;
781 if (previous == index)
782 return 0; /* No change */
783
784 sel->clk_index = index;
785
786 flags = ccu_lock(ccu);
787 __ccu_write_enable(ccu);
788
789 ret = __sel_commit(ccu, gate, sel, trig);
790
791 __ccu_write_disable(ccu);
792 ccu_unlock(ccu, flags);
793
794 if (ret)
795 sel->clk_index = previous; /* Revert the change */
796
797 return ret;
798}
799
800/* Clock operations */
801
802static int kona_peri_clk_enable(struct clk_hw *hw)
803{
804 struct kona_clk *bcm_clk = to_kona_clk(hw);
805 struct bcm_clk_gate *gate = &bcm_clk->peri->gate;
806
807 return clk_gate(bcm_clk->ccu, bcm_clk->name, gate, true);
808}
809
810static void kona_peri_clk_disable(struct clk_hw *hw)
811{
812 struct kona_clk *bcm_clk = to_kona_clk(hw);
813 struct bcm_clk_gate *gate = &bcm_clk->peri->gate;
814
815 (void)clk_gate(bcm_clk->ccu, bcm_clk->name, gate, false);
816}
817
818static int kona_peri_clk_is_enabled(struct clk_hw *hw)
819{
820 struct kona_clk *bcm_clk = to_kona_clk(hw);
821 struct bcm_clk_gate *gate = &bcm_clk->peri->gate;
822
823 return is_clk_gate_enabled(bcm_clk->ccu, gate) ? 1 : 0;
824}
825
826static unsigned long kona_peri_clk_recalc_rate(struct clk_hw *hw,
827 unsigned long parent_rate)
828{
829 struct kona_clk *bcm_clk = to_kona_clk(hw);
830 struct peri_clk_data *data = bcm_clk->peri;
831
832 return clk_recalc_rate(bcm_clk->ccu, &data->div, &data->pre_div,
833 parent_rate);
834}
835
836static long kona_peri_clk_round_rate(struct clk_hw *hw, unsigned long rate,
837 unsigned long *parent_rate)
838{
839 struct kona_clk *bcm_clk = to_kona_clk(hw);
840 struct bcm_clk_div *div = &bcm_clk->peri->div;
841
842 if (!divider_exists(div))
843 return __clk_get_rate(hw->clk);
844
845 /* Quietly avoid a zero rate */
846 return round_rate(bcm_clk->ccu, div, &bcm_clk->peri->pre_div,
847 rate ? rate : 1, *parent_rate, NULL);
848}
849
850static int kona_peri_clk_set_parent(struct clk_hw *hw, u8 index)
851{
852 struct kona_clk *bcm_clk = to_kona_clk(hw);
853 struct peri_clk_data *data = bcm_clk->peri;
854 struct bcm_clk_sel *sel = &data->sel;
855 struct bcm_clk_trig *trig;
856 int ret;
857
858 BUG_ON(index >= sel->parent_count);
859
860 /* If there's only one parent we don't require a selector */
861 if (!selector_exists(sel))
862 return 0;
863
864 /*
865 * The regular trigger is used by default, but if there's a
866 * pre-trigger we want to use that instead.
867 */
868 trig = trigger_exists(&data->pre_trig) ? &data->pre_trig
869 : &data->trig;
870
871 ret = selector_write(bcm_clk->ccu, &data->gate, sel, trig, index);
872 if (ret == -ENXIO) {
873 pr_err("%s: gating failure for %s\n", __func__, bcm_clk->name);
874 ret = -EIO; /* Don't proliferate weird errors */
875 } else if (ret == -EIO) {
876 pr_err("%s: %strigger failed for %s\n", __func__,
877 trig == &data->pre_trig ? "pre-" : "",
878 bcm_clk->name);
879 }
880
881 return ret;
882}
883
884static u8 kona_peri_clk_get_parent(struct clk_hw *hw)
885{
886 struct kona_clk *bcm_clk = to_kona_clk(hw);
887 struct peri_clk_data *data = bcm_clk->peri;
888 u8 index;
889
890 index = selector_read_index(bcm_clk->ccu, &data->sel);
891
892 /* Not all callers would handle an out-of-range value gracefully */
893 return index == BAD_CLK_INDEX ? 0 : index;
894}
895
896static int kona_peri_clk_set_rate(struct clk_hw *hw, unsigned long rate,
897 unsigned long parent_rate)
898{
899 struct kona_clk *bcm_clk = to_kona_clk(hw);
900 struct peri_clk_data *data = bcm_clk->peri;
901 struct bcm_clk_div *div = &data->div;
902 u64 scaled_div = 0;
903 int ret;
904
905 if (parent_rate > (unsigned long)LONG_MAX)
906 return -EINVAL;
907
908 if (rate == __clk_get_rate(hw->clk))
909 return 0;
910
911 if (!divider_exists(div))
912 return rate == parent_rate ? 0 : -EINVAL;
913
914 /*
915 * A fixed divider can't be changed. (Nor can a fixed
916 * pre-divider be, but for now we never actually try to
917 * change that.) Tolerate a request for a no-op change.
918 */
919 if (divider_is_fixed(&data->div))
920 return rate == parent_rate ? 0 : -EINVAL;
921
922 /*
923 * Get the scaled divisor value needed to achieve a clock
924 * rate as close as possible to what was requested, given
925 * the parent clock rate supplied.
926 */
927 (void)round_rate(bcm_clk->ccu, div, &data->pre_div,
928 rate ? rate : 1, parent_rate, &scaled_div);
929
930 /*
931 * We aren't updating any pre-divider at this point, so
932 * we'll use the regular trigger.
933 */
934 ret = divider_write(bcm_clk->ccu, &data->gate, &data->div,
935 &data->trig, scaled_div);
936 if (ret == -ENXIO) {
937 pr_err("%s: gating failure for %s\n", __func__, bcm_clk->name);
938 ret = -EIO; /* Don't proliferate weird errors */
939 } else if (ret == -EIO) {
940 pr_err("%s: trigger failed for %s\n", __func__, bcm_clk->name);
941 }
942
943 return ret;
944}
945
946struct clk_ops kona_peri_clk_ops = {
947 .enable = kona_peri_clk_enable,
948 .disable = kona_peri_clk_disable,
949 .is_enabled = kona_peri_clk_is_enabled,
950 .recalc_rate = kona_peri_clk_recalc_rate,
951 .round_rate = kona_peri_clk_round_rate,
952 .set_parent = kona_peri_clk_set_parent,
953 .get_parent = kona_peri_clk_get_parent,
954 .set_rate = kona_peri_clk_set_rate,
955};
956
957/* Put a peripheral clock into its initial state */
958static bool __peri_clk_init(struct kona_clk *bcm_clk)
959{
960 struct ccu_data *ccu = bcm_clk->ccu;
961 struct peri_clk_data *peri = bcm_clk->peri;
962 const char *name = bcm_clk->name;
963 struct bcm_clk_trig *trig;
964
965 BUG_ON(bcm_clk->type != bcm_clk_peri);
966
967 if (!gate_init(ccu, &peri->gate)) {
968 pr_err("%s: error initializing gate for %s\n", __func__, name);
969 return false;
970 }
971 if (!div_init(ccu, &peri->gate, &peri->div, &peri->trig)) {
972 pr_err("%s: error initializing divider for %s\n", __func__,
973 name);
974 return false;
975 }
976
977 /*
978 * For the pre-divider and selector, the pre-trigger is used
979 * if it's present, otherwise we just use the regular trigger.
980 */
981 trig = trigger_exists(&peri->pre_trig) ? &peri->pre_trig
982 : &peri->trig;
983
984 if (!div_init(ccu, &peri->gate, &peri->pre_div, trig)) {
985 pr_err("%s: error initializing pre-divider for %s\n", __func__,
986 name);
987 return false;
988 }
989
990 if (!sel_init(ccu, &peri->gate, &peri->sel, trig)) {
991 pr_err("%s: error initializing selector for %s\n", __func__,
992 name);
993 return false;
994 }
995
996 return true;
997}
998
999static bool __kona_clk_init(struct kona_clk *bcm_clk)
1000{
1001 switch (bcm_clk->type) {
1002 case bcm_clk_peri:
1003 return __peri_clk_init(bcm_clk);
1004 default:
1005 BUG();
1006 }
1007 return -EINVAL;
1008}
1009
1010/* Set a CCU and all its clocks into their desired initial state */
1011bool __init kona_ccu_init(struct ccu_data *ccu)
1012{
1013 unsigned long flags;
1014 unsigned int which;
1015 struct clk **clks = ccu->data.clks;
1016 bool success = true;
1017
1018 flags = ccu_lock(ccu);
1019 __ccu_write_enable(ccu);
1020
1021 for (which = 0; which < ccu->data.clk_num; which++) {
1022 struct kona_clk *bcm_clk;
1023
1024 if (!clks[which])
1025 continue;
1026 bcm_clk = to_kona_clk(__clk_get_hw(clks[which]));
1027 success &= __kona_clk_init(bcm_clk);
1028 }
1029
1030 __ccu_write_disable(ccu);
1031 ccu_unlock(ccu, flags);
1032 return success;
1033}
diff --git a/drivers/clk/bcm/clk-kona.h b/drivers/clk/bcm/clk-kona.h
new file mode 100644
index 000000000000..5e139adc3dc5
--- /dev/null
+++ b/drivers/clk/bcm/clk-kona.h
@@ -0,0 +1,410 @@
1/*
2 * Copyright (C) 2013 Broadcom Corporation
3 * Copyright 2013 Linaro Limited
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation version 2.
8 *
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether express or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#ifndef _CLK_KONA_H
16#define _CLK_KONA_H
17
18#include <linux/kernel.h>
19#include <linux/list.h>
20#include <linux/spinlock.h>
21#include <linux/slab.h>
22#include <linux/device.h>
23#include <linux/of.h>
24#include <linux/clk-provider.h>
25
26#define BILLION 1000000000
27
28/* The common clock framework uses u8 to represent a parent index */
29#define PARENT_COUNT_MAX ((u32)U8_MAX)
30
31#define BAD_CLK_INDEX U8_MAX /* Can't ever be valid */
32#define BAD_CLK_NAME ((const char *)-1)
33
34#define BAD_SCALED_DIV_VALUE U64_MAX
35
36/*
37 * Utility macros for object flag management. If possible, flags
38 * should be defined such that 0 is the desired default value.
39 */
40#define FLAG(type, flag) BCM_CLK_ ## type ## _FLAGS_ ## flag
41#define FLAG_SET(obj, type, flag) ((obj)->flags |= FLAG(type, flag))
42#define FLAG_CLEAR(obj, type, flag) ((obj)->flags &= ~(FLAG(type, flag)))
43#define FLAG_FLIP(obj, type, flag) ((obj)->flags ^= FLAG(type, flag))
44#define FLAG_TEST(obj, type, flag) (!!((obj)->flags & FLAG(type, flag)))
45
46/* Clock field state tests */
47
48#define gate_exists(gate) FLAG_TEST(gate, GATE, EXISTS)
49#define gate_is_enabled(gate) FLAG_TEST(gate, GATE, ENABLED)
50#define gate_is_hw_controllable(gate) FLAG_TEST(gate, GATE, HW)
51#define gate_is_sw_controllable(gate) FLAG_TEST(gate, GATE, SW)
52#define gate_is_sw_managed(gate) FLAG_TEST(gate, GATE, SW_MANAGED)
53#define gate_is_no_disable(gate) FLAG_TEST(gate, GATE, NO_DISABLE)
54
55#define gate_flip_enabled(gate) FLAG_FLIP(gate, GATE, ENABLED)
56
57#define divider_exists(div) FLAG_TEST(div, DIV, EXISTS)
58#define divider_is_fixed(div) FLAG_TEST(div, DIV, FIXED)
59#define divider_has_fraction(div) (!divider_is_fixed(div) && \
60 (div)->frac_width > 0)
61
62#define selector_exists(sel) ((sel)->width != 0)
63#define trigger_exists(trig) FLAG_TEST(trig, TRIG, EXISTS)
64
65/* Clock type, used to tell common block what it's part of */
66enum bcm_clk_type {
67 bcm_clk_none, /* undefined clock type */
68 bcm_clk_bus,
69 bcm_clk_core,
70 bcm_clk_peri
71};
72
73/*
74 * Each CCU defines a mapped area of memory containing registers
75 * used to manage clocks implemented by the CCU. Access to memory
76 * within the CCU's space is serialized by a spinlock. Before any
77 * (other) address can be written, a special access "password" value
78 * must be written to its WR_ACCESS register (located at the base
79 * address of the range). We keep track of the name of each CCU as
80 * it is set up, and maintain them in a list.
81 */
82struct ccu_data {
83 void __iomem *base; /* base of mapped address space */
84 spinlock_t lock; /* serialization lock */
85 bool write_enabled; /* write access is currently enabled */
86 struct list_head links; /* for ccu_list */
87 struct device_node *node;
88 struct clk_onecell_data data;
89 const char *name;
90 u32 range; /* byte range of address space */
91};
92
93/*
94 * Gating control and status is managed by a 32-bit gate register.
95 *
96 * There are several types of gating available:
97 * - (no gate)
98 * A clock with no gate is assumed to be always enabled.
99 * - hardware-only gating (auto-gating)
100 * Enabling or disabling clocks with this type of gate is
101 * managed automatically by the hardware. Such clocks can be
102 * considered by the software to be enabled. The current status
103 * of auto-gated clocks can be read from the gate status bit.
104 * - software-only gating
105 * Auto-gating is not available for this type of clock.
106 * Instead, software manages whether it's enabled by setting or
107 * clearing the enable bit. The current gate status of a gate
108 * under software control can be read from the gate status bit.
109 * To ensure a change to the gating status is complete, the
110 * status bit can be polled to verify that the gate has entered
111 * the desired state.
112 * - selectable hardware or software gating
113 * Gating for this type of clock can be configured to be either
114 * under software or hardware control. Which type is in use is
115 * determined by the hw_sw_sel bit of the gate register.
116 */
117struct bcm_clk_gate {
118 u32 offset; /* gate register offset */
119 u32 status_bit; /* 0: gate is disabled; 0: gatge is enabled */
120 u32 en_bit; /* 0: disable; 1: enable */
121 u32 hw_sw_sel_bit; /* 0: hardware gating; 1: software gating */
122 u32 flags; /* BCM_CLK_GATE_FLAGS_* below */
123};
124
125/*
126 * Gate flags:
127 * HW means this gate can be auto-gated
128 * SW means the state of this gate can be software controlled
129 * NO_DISABLE means this gate is (only) enabled if under software control
130 * SW_MANAGED means the status of this gate is under software control
131 * ENABLED means this software-managed gate is *supposed* to be enabled
132 */
133#define BCM_CLK_GATE_FLAGS_EXISTS ((u32)1 << 0) /* Gate is valid */
134#define BCM_CLK_GATE_FLAGS_HW ((u32)1 << 1) /* Can auto-gate */
135#define BCM_CLK_GATE_FLAGS_SW ((u32)1 << 2) /* Software control */
136#define BCM_CLK_GATE_FLAGS_NO_DISABLE ((u32)1 << 3) /* HW or enabled */
137#define BCM_CLK_GATE_FLAGS_SW_MANAGED ((u32)1 << 4) /* SW now in control */
138#define BCM_CLK_GATE_FLAGS_ENABLED ((u32)1 << 5) /* If SW_MANAGED */
139
140/*
141 * Gate initialization macros.
142 *
143 * Any gate initially under software control will be enabled.
144 */
145
146/* A hardware/software gate initially under software control */
147#define HW_SW_GATE(_offset, _status_bit, _en_bit, _hw_sw_sel_bit) \
148 { \
149 .offset = (_offset), \
150 .status_bit = (_status_bit), \
151 .en_bit = (_en_bit), \
152 .hw_sw_sel_bit = (_hw_sw_sel_bit), \
153 .flags = FLAG(GATE, HW)|FLAG(GATE, SW)| \
154 FLAG(GATE, SW_MANAGED)|FLAG(GATE, ENABLED)| \
155 FLAG(GATE, EXISTS), \
156 }
157
158/* A hardware/software gate initially under hardware control */
159#define HW_SW_GATE_AUTO(_offset, _status_bit, _en_bit, _hw_sw_sel_bit) \
160 { \
161 .offset = (_offset), \
162 .status_bit = (_status_bit), \
163 .en_bit = (_en_bit), \
164 .hw_sw_sel_bit = (_hw_sw_sel_bit), \
165 .flags = FLAG(GATE, HW)|FLAG(GATE, SW)| \
166 FLAG(GATE, EXISTS), \
167 }
168
169/* A hardware-or-enabled gate (enabled if not under hardware control) */
170#define HW_ENABLE_GATE(_offset, _status_bit, _en_bit, _hw_sw_sel_bit) \
171 { \
172 .offset = (_offset), \
173 .status_bit = (_status_bit), \
174 .en_bit = (_en_bit), \
175 .hw_sw_sel_bit = (_hw_sw_sel_bit), \
176 .flags = FLAG(GATE, HW)|FLAG(GATE, SW)| \
177 FLAG(GATE, NO_DISABLE)|FLAG(GATE, EXISTS), \
178 }
179
180/* A software-only gate */
181#define SW_ONLY_GATE(_offset, _status_bit, _en_bit) \
182 { \
183 .offset = (_offset), \
184 .status_bit = (_status_bit), \
185 .en_bit = (_en_bit), \
186 .flags = FLAG(GATE, SW)|FLAG(GATE, SW_MANAGED)| \
187 FLAG(GATE, ENABLED)|FLAG(GATE, EXISTS), \
188 }
189
190/* A hardware-only gate */
191#define HW_ONLY_GATE(_offset, _status_bit) \
192 { \
193 .offset = (_offset), \
194 .status_bit = (_status_bit), \
195 .flags = FLAG(GATE, HW)|FLAG(GATE, EXISTS), \
196 }
197
198/*
199 * Each clock can have zero, one, or two dividers which change the
200 * output rate of the clock. Each divider can be either fixed or
201 * variable. If there are two dividers, they are the "pre-divider"
202 * and the "regular" or "downstream" divider. If there is only one,
203 * there is no pre-divider.
204 *
205 * A fixed divider is any non-zero (positive) value, and it
206 * indicates how the input rate is affected by the divider.
207 *
208 * The value of a variable divider is maintained in a sub-field of a
209 * 32-bit divider register. The position of the field in the
210 * register is defined by its offset and width. The value recorded
211 * in this field is always 1 less than the value it represents.
212 *
213 * In addition, a variable divider can indicate that some subset
214 * of its bits represent a "fractional" part of the divider. Such
215 * bits comprise the low-order portion of the divider field, and can
216 * be viewed as representing the portion of the divider that lies to
217 * the right of the decimal point. Most variable dividers have zero
218 * fractional bits. Variable dividers with non-zero fraction width
219 * still record a value 1 less than the value they represent; the
220 * added 1 does *not* affect the low-order bit in this case, it
221 * affects the bits above the fractional part only. (Often in this
222 * code a divider field value is distinguished from the value it
223 * represents by referring to the latter as a "divisor".)
224 *
225 * In order to avoid dealing with fractions, divider arithmetic is
226 * performed using "scaled" values. A scaled value is one that's
227 * been left-shifted by the fractional width of a divider. Dividing
228 * a scaled value by a scaled divisor produces the desired quotient
229 * without loss of precision and without any other special handling
230 * for fractions.
231 *
232 * The recorded value of a variable divider can be modified. To
233 * modify either divider (or both), a clock must be enabled (i.e.,
234 * using its gate). In addition, a trigger register (described
235 * below) must be used to commit the change, and polled to verify
236 * the change is complete.
237 */
238struct bcm_clk_div {
239 union {
240 struct { /* variable divider */
241 u32 offset; /* divider register offset */
242 u32 shift; /* field shift */
243 u32 width; /* field width */
244 u32 frac_width; /* field fraction width */
245
246 u64 scaled_div; /* scaled divider value */
247 };
248 u32 fixed; /* non-zero fixed divider value */
249 };
250 u32 flags; /* BCM_CLK_DIV_FLAGS_* below */
251};
252
253/*
254 * Divider flags:
255 * EXISTS means this divider exists
256 * FIXED means it is a fixed-rate divider
257 */
258#define BCM_CLK_DIV_FLAGS_EXISTS ((u32)1 << 0) /* Divider is valid */
259#define BCM_CLK_DIV_FLAGS_FIXED ((u32)1 << 1) /* Fixed-value */
260
261/* Divider initialization macros */
262
263/* A fixed (non-zero) divider */
264#define FIXED_DIVIDER(_value) \
265 { \
266 .fixed = (_value), \
267 .flags = FLAG(DIV, EXISTS)|FLAG(DIV, FIXED), \
268 }
269
270/* A divider with an integral divisor */
271#define DIVIDER(_offset, _shift, _width) \
272 { \
273 .offset = (_offset), \
274 .shift = (_shift), \
275 .width = (_width), \
276 .scaled_div = BAD_SCALED_DIV_VALUE, \
277 .flags = FLAG(DIV, EXISTS), \
278 }
279
280/* A divider whose divisor has an integer and fractional part */
281#define FRAC_DIVIDER(_offset, _shift, _width, _frac_width) \
282 { \
283 .offset = (_offset), \
284 .shift = (_shift), \
285 .width = (_width), \
286 .frac_width = (_frac_width), \
287 .scaled_div = BAD_SCALED_DIV_VALUE, \
288 .flags = FLAG(DIV, EXISTS), \
289 }
290
291/*
292 * Clocks may have multiple "parent" clocks. If there is more than
293 * one, a selector must be specified to define which of the parent
294 * clocks is currently in use. The selected clock is indicated in a
295 * sub-field of a 32-bit selector register. The range of
296 * representable selector values typically exceeds the number of
297 * available parent clocks. Occasionally the reset value of a
298 * selector field is explicitly set to a (specific) value that does
299 * not correspond to a defined input clock.
300 *
301 * We register all known parent clocks with the common clock code
302 * using a packed array (i.e., no empty slots) of (parent) clock
303 * names, and refer to them later using indexes into that array.
304 * We maintain an array of selector values indexed by common clock
305 * index values in order to map between these common clock indexes
306 * and the selector values used by the hardware.
307 *
308 * Like dividers, a selector can be modified, but to do so a clock
309 * must be enabled, and a trigger must be used to commit the change.
310 */
311struct bcm_clk_sel {
312 u32 offset; /* selector register offset */
313 u32 shift; /* field shift */
314 u32 width; /* field width */
315
316 u32 parent_count; /* number of entries in parent_sel[] */
317 u32 *parent_sel; /* array of parent selector values */
318 u8 clk_index; /* current selected index in parent_sel[] */
319};
320
321/* Selector initialization macro */
322#define SELECTOR(_offset, _shift, _width) \
323 { \
324 .offset = (_offset), \
325 .shift = (_shift), \
326 .width = (_width), \
327 .clk_index = BAD_CLK_INDEX, \
328 }
329
330/*
331 * Making changes to a variable divider or a selector for a clock
332 * requires the use of a trigger. A trigger is defined by a single
333 * bit within a register. To signal a change, a 1 is written into
334 * that bit. To determine when the change has been completed, that
335 * trigger bit is polled; the read value will be 1 while the change
336 * is in progress, and 0 when it is complete.
337 *
338 * Occasionally a clock will have more than one trigger. In this
339 * case, the "pre-trigger" will be used when changing a clock's
340 * selector and/or its pre-divider.
341 */
342struct bcm_clk_trig {
343 u32 offset; /* trigger register offset */
344 u32 bit; /* trigger bit */
345 u32 flags; /* BCM_CLK_TRIG_FLAGS_* below */
346};
347
348/*
349 * Trigger flags:
350 * EXISTS means this trigger exists
351 */
352#define BCM_CLK_TRIG_FLAGS_EXISTS ((u32)1 << 0) /* Trigger is valid */
353
354/* Trigger initialization macro */
355#define TRIGGER(_offset, _bit) \
356 { \
357 .offset = (_offset), \
358 .bit = (_bit), \
359 .flags = FLAG(TRIG, EXISTS), \
360 }
361
362struct peri_clk_data {
363 struct bcm_clk_gate gate;
364 struct bcm_clk_trig pre_trig;
365 struct bcm_clk_div pre_div;
366 struct bcm_clk_trig trig;
367 struct bcm_clk_div div;
368 struct bcm_clk_sel sel;
369 const char *clocks[]; /* must be last; use CLOCKS() to declare */
370};
371#define CLOCKS(...) { __VA_ARGS__, NULL, }
372#define NO_CLOCKS { NULL, } /* Must use of no parent clocks */
373
374struct kona_clk {
375 struct clk_hw hw;
376 struct clk_init_data init_data;
377 const char *name; /* name of this clock */
378 struct ccu_data *ccu; /* ccu this clock is associated with */
379 enum bcm_clk_type type;
380 union {
381 void *data;
382 struct peri_clk_data *peri;
383 };
384};
385#define to_kona_clk(_hw) \
386 container_of(_hw, struct kona_clk, hw)
387
388/* Exported globals */
389
390extern struct clk_ops kona_peri_clk_ops;
391
392/* Help functions */
393
394#define PERI_CLK_SETUP(clks, ccu, id, name) \
395 clks[id] = kona_clk_setup(ccu, #name, bcm_clk_peri, &name ## _data)
396
397/* Externally visible functions */
398
399extern u64 do_div_round_closest(u64 dividend, unsigned long divisor);
400extern u64 scaled_div_max(struct bcm_clk_div *div);
401extern u64 scaled_div_build(struct bcm_clk_div *div, u32 div_value,
402 u32 billionths);
403
404extern struct clk *kona_clk_setup(struct ccu_data *ccu, const char *name,
405 enum bcm_clk_type type, void *data);
406extern void __init kona_dt_ccu_setup(struct device_node *node,
407 int (*ccu_clks_setup)(struct ccu_data *));
408extern bool __init kona_ccu_init(struct ccu_data *ccu);
409
410#endif /* _CLK_KONA_H */
diff --git a/include/dt-bindings/clock/bcm281xx.h b/include/dt-bindings/clock/bcm281xx.h
new file mode 100644
index 000000000000..e0096940886d
--- /dev/null
+++ b/include/dt-bindings/clock/bcm281xx.h
@@ -0,0 +1,65 @@
1/*
2 * Copyright (C) 2013 Broadcom Corporation
3 * Copyright 2013 Linaro Limited
4 *
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation version 2.
8 *
9 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
10 * kind, whether express or implied; without even the implied warranty
11 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 */
14
15#ifndef _CLOCK_BCM281XX_H
16#define _CLOCK_BCM281XX_H
17
18/*
19 * This file defines the values used to specify clocks provided by
20 * the clock control units (CCUs) on Broadcom BCM281XX family SoCs.
21 */
22
23/* root CCU clock ids */
24
25#define BCM281XX_ROOT_CCU_FRAC_1M 0
26#define BCM281XX_ROOT_CCU_CLOCK_COUNT 1
27
28/* aon CCU clock ids */
29
30#define BCM281XX_AON_CCU_HUB_TIMER 0
31#define BCM281XX_AON_CCU_PMU_BSC 1
32#define BCM281XX_AON_CCU_PMU_BSC_VAR 2
33#define BCM281XX_AON_CCU_CLOCK_COUNT 3
34
35/* hub CCU clock ids */
36
37#define BCM281XX_HUB_CCU_TMON_1M 0
38#define BCM281XX_HUB_CCU_CLOCK_COUNT 1
39
40/* master CCU clock ids */
41
42#define BCM281XX_MASTER_CCU_SDIO1 0
43#define BCM281XX_MASTER_CCU_SDIO2 1
44#define BCM281XX_MASTER_CCU_SDIO3 2
45#define BCM281XX_MASTER_CCU_SDIO4 3
46#define BCM281XX_MASTER_CCU_USB_IC 4
47#define BCM281XX_MASTER_CCU_HSIC2_48M 5
48#define BCM281XX_MASTER_CCU_HSIC2_12M 6
49#define BCM281XX_MASTER_CCU_CLOCK_COUNT 7
50
51/* slave CCU clock ids */
52
53#define BCM281XX_SLAVE_CCU_UARTB 0
54#define BCM281XX_SLAVE_CCU_UARTB2 1
55#define BCM281XX_SLAVE_CCU_UARTB3 2
56#define BCM281XX_SLAVE_CCU_UARTB4 3
57#define BCM281XX_SLAVE_CCU_SSP0 4
58#define BCM281XX_SLAVE_CCU_SSP2 5
59#define BCM281XX_SLAVE_CCU_BSC1 6
60#define BCM281XX_SLAVE_CCU_BSC2 7
61#define BCM281XX_SLAVE_CCU_BSC3 8
62#define BCM281XX_SLAVE_CCU_PWM 9
63#define BCM281XX_SLAVE_CCU_CLOCK_COUNT 10
64
65#endif /* _CLOCK_BCM281XX_H */
generated by cgit v1.2.2 (git 2.25.0) at 2026-01-06 03:21:10 -0500