aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm
diff options
context:
space:
mode:
authorDavid Brownell <dbrownell@users.sourceforge.net>2006-12-07 17:03:49 -0500
committerTony Lindgren <tony@atomide.com>2007-09-20 12:59:21 -0400
commitc1ed6407cddbd87206b860f6207731d51c1d57bf (patch)
tree0091d8a318a3cad8829ccef4136b48cf96d0bc63 /arch/arm
parent7d34f3b3901cf31611183f158b949d8a823a9762 (diff)
ARM: OMAP: TUSB EVM init
Add init support for the TUSB6010 EVM board, as connected to H4. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/mach-omap2/usb-tusb6010.c349
1 files changed, 349 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/usb-tusb6010.c b/arch/arm/mach-omap2/usb-tusb6010.c
new file mode 100644
index 000000000000..80bb42eb5082
--- /dev/null
+++ b/arch/arm/mach-omap2/usb-tusb6010.c
@@ -0,0 +1,349 @@
1/*
2 * linux/arch/arm/mach-omap2/usb-tusb6010.c
3 *
4 * Copyright (C) 2006 Nokia Corporation
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
9 */
10
11#include <linux/types.h>
12#include <linux/errno.h>
13#include <linux/delay.h>
14#include <linux/platform_device.h>
15
16#include <linux/usb/musb.h>
17
18#include <asm/arch/gpmc.h>
19#include <asm/arch/gpio.h>
20#include <asm/arch/mux.h>
21
22
23static u8 async_cs, sync_cs;
24static unsigned refclk_psec;
25
26
27/* t2_ps, when quantized to fclk units, must happen no earlier than
28 * the clock after after t1_NS.
29 *
30 * Return a possibly updated value of t2_ps, converted to nsec.
31 */
32static unsigned
33next_clk(unsigned t1_NS, unsigned t2_ps, unsigned fclk_ps)
34{
35 unsigned t1_ps = t1_NS * 1000;
36 unsigned t1_f, t2_f;
37
38 if ((t1_ps + fclk_ps) < t2_ps)
39 return t2_ps / 1000;
40
41 t1_f = (t1_ps + fclk_ps - 1) / fclk_ps;
42 t2_f = (t2_ps + fclk_ps - 1) / fclk_ps;
43
44 if (t1_f >= t2_f)
45 t2_f = t1_f + 1;
46
47 return (t2_f * fclk_ps) / 1000;
48}
49
50/* NOTE: timings are from tusb 6010 datasheet Rev 1.8, 12-Sept 2006 */
51
52static int tusb_set_async_mode(unsigned sysclk_ps, unsigned fclk_ps)
53{
54 struct gpmc_timings t;
55 unsigned t_acsnh_advnh = sysclk_ps + 3000;
56 unsigned tmp;
57
58 memset(&t, 0, sizeof(t));
59
60 /* CS_ON = t_acsnh_acsnl */
61 t.cs_on = 8;
62 /* ADV_ON = t_acsnh_advnh - t_advn */
63 t.adv_on = next_clk(t.cs_on, t_acsnh_advnh - 7000, fclk_ps);
64
65 /*
66 * READ ... from omap2420 TRM fig 12-13
67 */
68
69 /* ADV_RD_OFF = t_acsnh_advnh */
70 t.adv_rd_off = next_clk(t.adv_on, t_acsnh_advnh, fclk_ps);
71
72 /* OE_ON = t_acsnh_advnh + t_advn_oen (then wait for nRDY) */
73 t.oe_on = next_clk(t.adv_on, t_acsnh_advnh + 1000, fclk_ps);
74
75 /* ACCESS = counters continue only after nRDY */
76 tmp = t.oe_on * 1000 + 300;
77 t.access = next_clk(t.oe_on, tmp, fclk_ps);
78
79 /* OE_OFF = after data gets sampled */
80 tmp = t.access * 1000;
81 t.oe_off = next_clk(t.access, tmp, fclk_ps);
82
83 t.cs_rd_off = t.oe_off;
84
85 tmp = t.cs_rd_off * 1000 + 7000 /* t_acsn_rdy_z */;
86 t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);
87
88 /*
89 * WRITE ... from omap2420 TRM fig 12-15
90 */
91
92 /* ADV_WR_OFF = t_acsnh_advnh */
93 t.adv_wr_off = t.adv_rd_off;
94
95 /* WE_ON = t_acsnh_advnh + t_advn_wen (then wait for nRDY) */
96 t.we_on = next_clk(t.adv_wr_off, t_acsnh_advnh + 1000, fclk_ps);
97
98 /* WE_OFF = after data gets sampled */
99 tmp = t.we_on * 1000 + 300;
100 t.we_off = next_clk(t.we_on, tmp, fclk_ps);
101
102 t.cs_wr_off = t.we_off;
103
104 tmp = t.cs_wr_off * 1000 + 7000 /* t_acsn_rdy_z */;
105 t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);
106
107 return gpmc_cs_set_timings(async_cs, &t);
108}
109
110static int tusb_set_sync_mode(unsigned sysclk_ps, unsigned fclk_ps)
111{
112 struct gpmc_timings t;
113 unsigned t_scsnh_advnh = sysclk_ps + 3000;
114 unsigned tmp;
115
116 memset(&t, 0, sizeof(t));
117 t.cs_on = 8;
118
119 /* ADV_ON = t_acsnh_advnh - t_advn */
120 t.adv_on = next_clk(t.cs_on, t_scsnh_advnh - 7000, fclk_ps);
121
122 /* GPMC_CLK rate = fclk rate / div */
123 t.sync_clk = 12 /* 11.1 nsec */;
124 tmp = (t.sync_clk * 1000 + fclk_ps - 1) / fclk_ps;
125 if (tmp > 4)
126 return -ERANGE;
127 if (tmp <= 0)
128 tmp = 1;
129 t.page_burst_access = (fclk_ps * tmp) / 1000;
130
131 /*
132 * READ ... based on omap2420 TRM fig 12-19, 12-20
133 */
134
135 /* ADV_RD_OFF = t_scsnh_advnh */
136 t.adv_rd_off = next_clk(t.adv_on, t_scsnh_advnh, fclk_ps);
137
138 /* OE_ON = t_scsnh_advnh + t_advn_oen * fclk_ps (then wait for nRDY) */
139 tmp = (t.adv_rd_off * 1000) + (3 * fclk_ps);
140 t.oe_on = next_clk(t.adv_on, tmp, fclk_ps);
141
142 /* ACCESS = number of clock cycles after t_adv_eon */
143 tmp = (t.oe_on * 1000) + (5 * fclk_ps);
144 t.access = next_clk(t.oe_on, tmp, fclk_ps);
145
146 /* OE_OFF = after data gets sampled */
147 tmp = (t.access * 1000) + (1 * fclk_ps);
148 t.oe_off = next_clk(t.access, tmp, fclk_ps);
149
150 t.cs_rd_off = t.oe_off;
151
152 tmp = t.cs_rd_off * 1000 + 7000 /* t_scsn_rdy_z */;
153 t.rd_cycle = next_clk(t.cs_rd_off, tmp, fclk_ps);
154
155 /*
156 * WRITE ... based on omap2420 TRM fig 12-21
157 */
158
159 /* ADV_WR_OFF = t_scsnh_advnh */
160 t.adv_wr_off = t.adv_rd_off;
161
162 /* WE_ON = t_scsnh_advnh + t_advn_wen * fclk_ps (then wait for nRDY) */
163 tmp = (t.adv_wr_off * 1000) + (3 * fclk_ps);
164 t.we_on = next_clk(t.adv_wr_off, tmp, fclk_ps);
165
166 /* WE_OFF = number of clock cycles after t_adv_wen */
167 tmp = (t.we_on * 1000) + (6 * fclk_ps);
168 t.we_off = next_clk(t.we_on, tmp, fclk_ps);
169
170 t.cs_wr_off = t.we_off;
171
172 tmp = t.cs_wr_off * 1000 + 7000 /* t_scsn_rdy_z */;
173 t.wr_cycle = next_clk(t.cs_wr_off, tmp, fclk_ps);
174
175 return gpmc_cs_set_timings(sync_cs, &t);
176}
177
178extern unsigned long gpmc_get_fclk_period(void);
179
180/* tusb driver calls this when it changes the chip's clocking */
181int tusb6010_platform_retime(unsigned is_refclk)
182{
183 static const char error[] =
184 KERN_ERR "tusb6010 %s retime error %d\n";
185
186 unsigned fclk_ps = gpmc_get_fclk_period();
187 unsigned sysclk_ps;
188 int status;
189
190 if (!refclk_psec)
191 return -ENODEV;
192
193 sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;
194
195 status = tusb_set_async_mode(sysclk_ps, fclk_ps);
196 if (status < 0) {
197 printk(error, "async", status);
198 goto done;
199 }
200 status = tusb_set_sync_mode(sysclk_ps, fclk_ps);
201 if (status < 0)
202 printk(error, "sync", status);
203done:
204 return status;
205}
206EXPORT_SYMBOL_GPL(tusb6010_platform_retime);
207
208static struct resource tusb_resources[] = {
209 /* Order is significant! The start/end fields
210 * are updated during setup..
211 */
212 { /* Asynchronous access */
213 .flags = IORESOURCE_MEM,
214 },
215 { /* Synchronous access */
216 .flags = IORESOURCE_MEM,
217 },
218 { /* IRQ */
219 .flags = IORESOURCE_IRQ,
220 },
221};
222
223static u64 tusb_dmamask = ~(u32)0;
224
225static struct platform_device tusb_device = {
226 .name = "musb_hdrc",
227 .id = -1,
228 .dev = {
229 .dma_mask = &tusb_dmamask,
230 .coherent_dma_mask = 0xffffffff,
231 },
232 .num_resources = ARRAY_SIZE(tusb_resources),
233 .resource = tusb_resources,
234};
235
236
237/* this may be called only from board-*.c setup code */
238int __init
239tusb6010_setup_interface(struct musb_hdrc_platform_data *data,
240 unsigned ps_refclk, unsigned waitpin,
241 unsigned async, unsigned sync,
242 unsigned irq, unsigned dmachan)
243{
244 int status;
245 static char error[] __initdata =
246 KERN_ERR "tusb6010 init error %d, %d\n";
247
248 /* ASYNC region, primarily for PIO */
249 status = gpmc_cs_request(async, SZ_16M, (unsigned long *)
250 &tusb_resources[0].start);
251 if (status < 0) {
252 printk(error, 1, status);
253 return status;
254 }
255 tusb_resources[0].end = tusb_resources[0].start + 0x9ff;
256 async_cs = async;
257 gpmc_cs_write_reg(async, GPMC_CS_CONFIG1,
258 GPMC_CONFIG1_PAGE_LEN(2)
259 | GPMC_CONFIG1_WAIT_READ_MON
260 | GPMC_CONFIG1_WAIT_WRITE_MON
261 | GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
262 | GPMC_CONFIG1_READTYPE_ASYNC
263 | GPMC_CONFIG1_WRITETYPE_ASYNC
264 | GPMC_CONFIG1_DEVICESIZE_16
265 | GPMC_CONFIG1_DEVICETYPE_NOR
266 | GPMC_CONFIG1_MUXADDDATA);
267
268
269 /* SYNC region, primarily for DMA */
270 status = gpmc_cs_request(sync, SZ_16M, (unsigned long *)
271 &tusb_resources[1].start);
272 if (status < 0) {
273 printk(error, 2, status);
274 return status;
275 }
276 tusb_resources[1].end = tusb_resources[1].start + 0x9ff;
277 sync_cs = sync;
278 gpmc_cs_write_reg(sync, GPMC_CS_CONFIG1,
279 GPMC_CONFIG1_READMULTIPLE_SUPP
280 | GPMC_CONFIG1_READTYPE_SYNC
281 | GPMC_CONFIG1_WRITEMULTIPLE_SUPP
282 | GPMC_CONFIG1_WRITETYPE_SYNC
283 | GPMC_CONFIG1_CLKACTIVATIONTIME(1)
284 | GPMC_CONFIG1_PAGE_LEN(2)
285 | GPMC_CONFIG1_WAIT_READ_MON
286 | GPMC_CONFIG1_WAIT_WRITE_MON
287 | GPMC_CONFIG1_WAIT_PIN_SEL(waitpin)
288 | GPMC_CONFIG1_DEVICESIZE_16
289 | GPMC_CONFIG1_DEVICETYPE_NOR
290 | GPMC_CONFIG1_MUXADDDATA
291 /* fclk divider gets set later */
292 );
293
294 /* IRQ */
295 status = omap_request_gpio(irq);
296 if (status < 0) {
297 printk(error, 3, status);
298 return status;
299 }
300 omap_set_gpio_direction(irq, 1);
301 tusb_resources[2].start = irq + IH_GPIO_BASE;
302
303 /* set up memory timings ... can speed them up later */
304 if (!ps_refclk) {
305 printk(error, 4, status);
306 return -ENODEV;
307 }
308 refclk_psec = ps_refclk;
309 status = tusb6010_platform_retime(1);
310 if (status < 0) {
311 printk(error, 5, status);
312 return status;
313 }
314
315 /* finish device setup ... */
316 if (!data) {
317 printk(error, 6, status);
318 return -ENODEV;
319 }
320 data->multipoint = 1;
321 tusb_device.dev.platform_data = data;
322
323 /* REVISIT let the driver know what DMA channels work */
324 if (!dmachan)
325 tusb_device.dev.dma_mask = NULL;
326 else {
327 /* assume OMAP 2420 ES2.0 and later */
328 if (dmachan & (1 << 0))
329 omap_cfg_reg(AA10_242X_DMAREQ0);
330 if (dmachan & (1 << 1))
331 omap_cfg_reg(AA6_242X_DMAREQ1);
332 if (dmachan & (1 << 2))
333 omap_cfg_reg(E4_242X_DMAREQ2);
334 if (dmachan & (1 << 3))
335 omap_cfg_reg(G4_242X_DMAREQ3);
336 if (dmachan & (1 << 4))
337 omap_cfg_reg(D3_242X_DMAREQ4);
338 if (dmachan & (1 << 5))
339 omap_cfg_reg(E3_242X_DMAREQ5);
340 }
341
342 /* so far so good ... register the device */
343 status = platform_device_register(&tusb_device);
344 if (status < 0) {
345 printk(error, 7, status);
346 return status;
347 }
348 return 0;
349}