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authorLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 11:45:12 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 11:45:12 -0400
commit0e26da0f2200a2fb51844aaa43e365ea9dd5a93d (patch)
tree73409a696901934da5f6df976c6521d3e50e8749 /drivers/i2c/busses
parent10a0d912898ac2fe49094acf2c1339d0fb4c2bc6 (diff)
parent65de394df21f8ccc61525f77b0e4ee6940a0932e (diff)
Merge branch 'i2c-for-2630-v2' of git://aeryn.fluff.org.uk/bjdooks/linux
* 'i2c-for-2630-v2' of git://aeryn.fluff.org.uk/bjdooks/linux: i2c: imx: Make disable_delay a per-device variable i2c: xtensa s6000 i2c driver powerpc/85xx: i2c-mpc: use new I2C bindings for the Socates board i2c: i2c-mpc: make I2C bus speed configurable i2c: i2c-mpc: use dev based printout function i2c: i2c-mpc: various coding style fixes i2c: imx: Add missing request_mem_region in probe() i2c: i2c-s3c2410: Initialise Samsung I2C controller early i2c-s3c2410: Simplify bus frequency calculation i2c-s3c2410: sda_delay should be in ns, not clock ticks i2c: iMX/MXC support
Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/Kconfig20
-rw-r--r--drivers/i2c/busses/Makefile2
-rw-r--r--drivers/i2c/busses/i2c-imx.c624
-rw-r--r--drivers/i2c/busses/i2c-mpc.c322
-rw-r--r--drivers/i2c/busses/i2c-s3c2410.c77
-rw-r--r--drivers/i2c/busses/i2c-s6000.c407
-rw-r--r--drivers/i2c/busses/i2c-s6000.h79
7 files changed, 1437 insertions, 94 deletions
diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index da809ad0996a..94eae5c3cbc7 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -356,6 +356,16 @@ config I2C_IBM_IIC
356 This driver can also be built as a module. If so, the module 356 This driver can also be built as a module. If so, the module
357 will be called i2c-ibm_iic. 357 will be called i2c-ibm_iic.
358 358
359config I2C_IMX
360 tristate "IMX I2C interface"
361 depends on ARCH_MXC
362 help
363 Say Y here if you want to use the IIC bus controller on
364 the Freescale i.MX/MXC processors.
365
366 This driver can also be built as a module. If so, the module
367 will be called i2c-imx.
368
359config I2C_IOP3XX 369config I2C_IOP3XX
360 tristate "Intel IOPx3xx and IXP4xx on-chip I2C interface" 370 tristate "Intel IOPx3xx and IXP4xx on-chip I2C interface"
361 depends on ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX || ARCH_IOP13XX 371 depends on ARCH_IOP32X || ARCH_IOP33X || ARCH_IXP4XX || ARCH_IOP13XX
@@ -462,6 +472,16 @@ config I2C_S3C2410
462 Say Y here to include support for I2C controller in the 472 Say Y here to include support for I2C controller in the
463 Samsung S3C2410 based System-on-Chip devices. 473 Samsung S3C2410 based System-on-Chip devices.
464 474
475config I2C_S6000
476 tristate "S6000 I2C support"
477 depends on XTENSA_VARIANT_S6000
478 help
479 This driver supports the on chip I2C device on the
480 S6000 xtensa processor family.
481
482 To compile this driver as a module, choose M here. The module
483 will be called i2c-s6000.
484
465config I2C_SH7760 485config I2C_SH7760
466 tristate "Renesas SH7760 I2C Controller" 486 tristate "Renesas SH7760 I2C Controller"
467 depends on CPU_SUBTYPE_SH7760 487 depends on CPU_SUBTYPE_SH7760
diff --git a/drivers/i2c/busses/Makefile b/drivers/i2c/busses/Makefile
index 0c2c4b26cdf1..776acb6403a7 100644
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_I2C_DAVINCI) += i2c-davinci.o
33obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o 33obj-$(CONFIG_I2C_GPIO) += i2c-gpio.o
34obj-$(CONFIG_I2C_HIGHLANDER) += i2c-highlander.o 34obj-$(CONFIG_I2C_HIGHLANDER) += i2c-highlander.o
35obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o 35obj-$(CONFIG_I2C_IBM_IIC) += i2c-ibm_iic.o
36obj-$(CONFIG_I2C_IMX) += i2c-imx.o
36obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o 37obj-$(CONFIG_I2C_IOP3XX) += i2c-iop3xx.o
37obj-$(CONFIG_I2C_IXP2000) += i2c-ixp2000.o 38obj-$(CONFIG_I2C_IXP2000) += i2c-ixp2000.o
38obj-$(CONFIG_I2C_MPC) += i2c-mpc.o 39obj-$(CONFIG_I2C_MPC) += i2c-mpc.o
@@ -43,6 +44,7 @@ obj-$(CONFIG_I2C_PASEMI) += i2c-pasemi.o
43obj-$(CONFIG_I2C_PNX) += i2c-pnx.o 44obj-$(CONFIG_I2C_PNX) += i2c-pnx.o
44obj-$(CONFIG_I2C_PXA) += i2c-pxa.o 45obj-$(CONFIG_I2C_PXA) += i2c-pxa.o
45obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o 46obj-$(CONFIG_I2C_S3C2410) += i2c-s3c2410.o
47obj-$(CONFIG_I2C_S6000) += i2c-s6000.o
46obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o 48obj-$(CONFIG_I2C_SH7760) += i2c-sh7760.o
47obj-$(CONFIG_I2C_SH_MOBILE) += i2c-sh_mobile.o 49obj-$(CONFIG_I2C_SH_MOBILE) += i2c-sh_mobile.o
48obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o 50obj-$(CONFIG_I2C_SIMTEC) += i2c-simtec.o
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
new file mode 100644
index 000000000000..0b486a63460d
--- /dev/null
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -0,0 +1,624 @@
1/*
2 * Copyright (C) 2002 Motorola GSG-China
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version 2
7 * of the License, or (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
17 * USA.
18 *
19 * Author:
20 * Darius Augulis, Teltonika Inc.
21 *
22 * Desc.:
23 * Implementation of I2C Adapter/Algorithm Driver
24 * for I2C Bus integrated in Freescale i.MX/MXC processors
25 *
26 * Derived from Motorola GSG China I2C example driver
27 *
28 * Copyright (C) 2005 Torsten Koschorrek <koschorrek at synertronixx.de
29 * Copyright (C) 2005 Matthias Blaschke <blaschke at synertronixx.de
30 * Copyright (C) 2007 RightHand Technologies, Inc.
31 * Copyright (C) 2008 Darius Augulis <darius.augulis at teltonika.lt>
32 *
33 */
34
35/** Includes *******************************************************************
36*******************************************************************************/
37
38#include <linux/init.h>
39#include <linux/kernel.h>
40#include <linux/module.h>
41#include <linux/errno.h>
42#include <linux/err.h>
43#include <linux/interrupt.h>
44#include <linux/delay.h>
45#include <linux/i2c.h>
46#include <linux/io.h>
47#include <linux/sched.h>
48#include <linux/platform_device.h>
49#include <linux/clk.h>
50
51#include <mach/irqs.h>
52#include <mach/hardware.h>
53#include <mach/i2c.h>
54
55/** Defines ********************************************************************
56*******************************************************************************/
57
58/* This will be the driver name the kernel reports */
59#define DRIVER_NAME "imx-i2c"
60
61/* Default value */
62#define IMX_I2C_BIT_RATE 100000 /* 100kHz */
63
64/* IMX I2C registers */
65#define IMX_I2C_IADR 0x00 /* i2c slave address */
66#define IMX_I2C_IFDR 0x04 /* i2c frequency divider */
67#define IMX_I2C_I2CR 0x08 /* i2c control */
68#define IMX_I2C_I2SR 0x0C /* i2c status */
69#define IMX_I2C_I2DR 0x10 /* i2c transfer data */
70
71/* Bits of IMX I2C registers */
72#define I2SR_RXAK 0x01
73#define I2SR_IIF 0x02
74#define I2SR_SRW 0x04
75#define I2SR_IAL 0x10
76#define I2SR_IBB 0x20
77#define I2SR_IAAS 0x40
78#define I2SR_ICF 0x80
79#define I2CR_RSTA 0x04
80#define I2CR_TXAK 0x08
81#define I2CR_MTX 0x10
82#define I2CR_MSTA 0x20
83#define I2CR_IIEN 0x40
84#define I2CR_IEN 0x80
85
86/** Variables ******************************************************************
87*******************************************************************************/
88
89/*
90 * sorted list of clock divider, register value pairs
91 * taken from table 26-5, p.26-9, Freescale i.MX
92 * Integrated Portable System Processor Reference Manual
93 * Document Number: MC9328MXLRM, Rev. 5.1, 06/2007
94 *
95 * Duplicated divider values removed from list
96 */
97
98static u16 __initdata i2c_clk_div[50][2] = {
99 { 22, 0x20 }, { 24, 0x21 }, { 26, 0x22 }, { 28, 0x23 },
100 { 30, 0x00 }, { 32, 0x24 }, { 36, 0x25 }, { 40, 0x26 },
101 { 42, 0x03 }, { 44, 0x27 }, { 48, 0x28 }, { 52, 0x05 },
102 { 56, 0x29 }, { 60, 0x06 }, { 64, 0x2A }, { 72, 0x2B },
103 { 80, 0x2C }, { 88, 0x09 }, { 96, 0x2D }, { 104, 0x0A },
104 { 112, 0x2E }, { 128, 0x2F }, { 144, 0x0C }, { 160, 0x30 },
105 { 192, 0x31 }, { 224, 0x32 }, { 240, 0x0F }, { 256, 0x33 },
106 { 288, 0x10 }, { 320, 0x34 }, { 384, 0x35 }, { 448, 0x36 },
107 { 480, 0x13 }, { 512, 0x37 }, { 576, 0x14 }, { 640, 0x38 },
108 { 768, 0x39 }, { 896, 0x3A }, { 960, 0x17 }, { 1024, 0x3B },
109 { 1152, 0x18 }, { 1280, 0x3C }, { 1536, 0x3D }, { 1792, 0x3E },
110 { 1920, 0x1B }, { 2048, 0x3F }, { 2304, 0x1C }, { 2560, 0x1D },
111 { 3072, 0x1E }, { 3840, 0x1F }
112};
113
114struct imx_i2c_struct {
115 struct i2c_adapter adapter;
116 struct resource *res;
117 struct clk *clk;
118 void __iomem *base;
119 int irq;
120 wait_queue_head_t queue;
121 unsigned long i2csr;
122 unsigned int disable_delay;
123};
124
125/** Functions for IMX I2C adapter driver ***************************************
126*******************************************************************************/
127
128static int i2c_imx_bus_busy(struct imx_i2c_struct *i2c_imx)
129{
130 unsigned long orig_jiffies = jiffies;
131
132 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
133
134 /* wait for bus not busy */
135 while (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_IBB) {
136 if (signal_pending(current)) {
137 dev_dbg(&i2c_imx->adapter.dev,
138 "<%s> I2C Interrupted\n", __func__);
139 return -EINTR;
140 }
141 if (time_after(jiffies, orig_jiffies + HZ / 1000)) {
142 dev_dbg(&i2c_imx->adapter.dev,
143 "<%s> I2C bus is busy\n", __func__);
144 return -EIO;
145 }
146 schedule();
147 }
148
149 return 0;
150}
151
152static int i2c_imx_trx_complete(struct imx_i2c_struct *i2c_imx)
153{
154 int result;
155
156 result = wait_event_interruptible_timeout(i2c_imx->queue,
157 i2c_imx->i2csr & I2SR_IIF, HZ / 10);
158
159 if (unlikely(result < 0)) {
160 dev_dbg(&i2c_imx->adapter.dev, "<%s> result < 0\n", __func__);
161 return result;
162 } else if (unlikely(!(i2c_imx->i2csr & I2SR_IIF))) {
163 dev_dbg(&i2c_imx->adapter.dev, "<%s> Timeout\n", __func__);
164 return -ETIMEDOUT;
165 }
166 dev_dbg(&i2c_imx->adapter.dev, "<%s> TRX complete\n", __func__);
167 i2c_imx->i2csr = 0;
168 return 0;
169}
170
171static int i2c_imx_acked(struct imx_i2c_struct *i2c_imx)
172{
173 if (readb(i2c_imx->base + IMX_I2C_I2SR) & I2SR_RXAK) {
174 dev_dbg(&i2c_imx->adapter.dev, "<%s> No ACK\n", __func__);
175 return -EIO; /* No ACK */
176 }
177
178 dev_dbg(&i2c_imx->adapter.dev, "<%s> ACK received\n", __func__);
179 return 0;
180}
181
182static void i2c_imx_start(struct imx_i2c_struct *i2c_imx)
183{
184 unsigned int temp = 0;
185
186 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
187
188 /* Enable I2C controller */
189 writeb(I2CR_IEN, i2c_imx->base + IMX_I2C_I2CR);
190 /* Start I2C transaction */
191 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
192 temp |= I2CR_MSTA;
193 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
194 temp |= I2CR_IIEN | I2CR_MTX | I2CR_TXAK;
195 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
196}
197
198static void i2c_imx_stop(struct imx_i2c_struct *i2c_imx)
199{
200 unsigned int temp = 0;
201
202 /* Stop I2C transaction */
203 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
204 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
205 temp &= ~I2CR_MSTA;
206 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
207 /* setup chip registers to defaults */
208 writeb(I2CR_IEN, i2c_imx->base + IMX_I2C_I2CR);
209 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
210 /*
211 * This delay caused by an i.MXL hardware bug.
212 * If no (or too short) delay, no "STOP" bit will be generated.
213 */
214 udelay(i2c_imx->disable_delay);
215 /* Disable I2C controller */
216 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
217}
218
219static void __init i2c_imx_set_clk(struct imx_i2c_struct *i2c_imx,
220 unsigned int rate)
221{
222 unsigned int i2c_clk_rate;
223 unsigned int div;
224 int i;
225
226 /* Divider value calculation */
227 i2c_clk_rate = clk_get_rate(i2c_imx->clk);
228 div = (i2c_clk_rate + rate - 1) / rate;
229 if (div < i2c_clk_div[0][0])
230 i = 0;
231 else if (div > i2c_clk_div[ARRAY_SIZE(i2c_clk_div) - 1][0])
232 i = ARRAY_SIZE(i2c_clk_div) - 1;
233 else
234 for (i = 0; i2c_clk_div[i][0] < div; i++);
235
236 /* Write divider value to register */
237 writeb(i2c_clk_div[i][1], i2c_imx->base + IMX_I2C_IFDR);
238
239 /*
240 * There dummy delay is calculated.
241 * It should be about one I2C clock period long.
242 * This delay is used in I2C bus disable function
243 * to fix chip hardware bug.
244 */
245 i2c_imx->disable_delay = (500000U * i2c_clk_div[i][0]
246 + (i2c_clk_rate / 2) - 1) / (i2c_clk_rate / 2);
247
248 /* dev_dbg() can't be used, because adapter is not yet registered */
249#ifdef CONFIG_I2C_DEBUG_BUS
250 printk(KERN_DEBUG "I2C: <%s> I2C_CLK=%d, REQ DIV=%d\n",
251 __func__, i2c_clk_rate, div);
252 printk(KERN_DEBUG "I2C: <%s> IFDR[IC]=0x%x, REAL DIV=%d\n",
253 __func__, i2c_clk_div[i][1], i2c_clk_div[i][0]);
254#endif
255}
256
257static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
258{
259 struct imx_i2c_struct *i2c_imx = dev_id;
260 unsigned int temp;
261
262 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
263 if (temp & I2SR_IIF) {
264 /* save status register */
265 i2c_imx->i2csr = temp;
266 temp &= ~I2SR_IIF;
267 writeb(temp, i2c_imx->base + IMX_I2C_I2SR);
268 wake_up_interruptible(&i2c_imx->queue);
269 return IRQ_HANDLED;
270 }
271
272 return IRQ_NONE;
273}
274
275static int i2c_imx_write(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
276{
277 int i, result;
278
279 dev_dbg(&i2c_imx->adapter.dev, "<%s> write slave address: addr=0x%x\n",
280 __func__, msgs->addr << 1);
281
282 /* write slave address */
283 writeb(msgs->addr << 1, i2c_imx->base + IMX_I2C_I2DR);
284 result = i2c_imx_trx_complete(i2c_imx);
285 if (result)
286 return result;
287 result = i2c_imx_acked(i2c_imx);
288 if (result)
289 return result;
290 dev_dbg(&i2c_imx->adapter.dev, "<%s> write data\n", __func__);
291
292 /* write data */
293 for (i = 0; i < msgs->len; i++) {
294 dev_dbg(&i2c_imx->adapter.dev,
295 "<%s> write byte: B%d=0x%X\n",
296 __func__, i, msgs->buf[i]);
297 writeb(msgs->buf[i], i2c_imx->base + IMX_I2C_I2DR);
298 result = i2c_imx_trx_complete(i2c_imx);
299 if (result)
300 return result;
301 result = i2c_imx_acked(i2c_imx);
302 if (result)
303 return result;
304 }
305 return 0;
306}
307
308static int i2c_imx_read(struct imx_i2c_struct *i2c_imx, struct i2c_msg *msgs)
309{
310 int i, result;
311 unsigned int temp;
312
313 dev_dbg(&i2c_imx->adapter.dev,
314 "<%s> write slave address: addr=0x%x\n",
315 __func__, (msgs->addr << 1) | 0x01);
316
317 /* write slave address */
318 writeb((msgs->addr << 1) | 0x01, i2c_imx->base + IMX_I2C_I2DR);
319 result = i2c_imx_trx_complete(i2c_imx);
320 if (result)
321 return result;
322 result = i2c_imx_acked(i2c_imx);
323 if (result)
324 return result;
325
326 dev_dbg(&i2c_imx->adapter.dev, "<%s> setup bus\n", __func__);
327
328 /* setup bus to read data */
329 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
330 temp &= ~I2CR_MTX;
331 if (msgs->len - 1)
332 temp &= ~I2CR_TXAK;
333 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
334 readb(i2c_imx->base + IMX_I2C_I2DR); /* dummy read */
335
336 dev_dbg(&i2c_imx->adapter.dev, "<%s> read data\n", __func__);
337
338 /* read data */
339 for (i = 0; i < msgs->len; i++) {
340 result = i2c_imx_trx_complete(i2c_imx);
341 if (result)
342 return result;
343 if (i == (msgs->len - 1)) {
344 dev_dbg(&i2c_imx->adapter.dev,
345 "<%s> clear MSTA\n", __func__);
346 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
347 temp &= ~I2CR_MSTA;
348 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
349 } else if (i == (msgs->len - 2)) {
350 dev_dbg(&i2c_imx->adapter.dev,
351 "<%s> set TXAK\n", __func__);
352 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
353 temp |= I2CR_TXAK;
354 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
355 }
356 msgs->buf[i] = readb(i2c_imx->base + IMX_I2C_I2DR);
357 dev_dbg(&i2c_imx->adapter.dev,
358 "<%s> read byte: B%d=0x%X\n",
359 __func__, i, msgs->buf[i]);
360 }
361 return 0;
362}
363
364static int i2c_imx_xfer(struct i2c_adapter *adapter,
365 struct i2c_msg *msgs, int num)
366{
367 unsigned int i, temp;
368 int result;
369 struct imx_i2c_struct *i2c_imx = i2c_get_adapdata(adapter);
370
371 dev_dbg(&i2c_imx->adapter.dev, "<%s>\n", __func__);
372
373 /* Check if i2c bus is not busy */
374 result = i2c_imx_bus_busy(i2c_imx);
375 if (result)
376 goto fail0;
377
378 /* Start I2C transfer */
379 i2c_imx_start(i2c_imx);
380
381 /* read/write data */
382 for (i = 0; i < num; i++) {
383 if (i) {
384 dev_dbg(&i2c_imx->adapter.dev,
385 "<%s> repeated start\n", __func__);
386 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
387 temp |= I2CR_RSTA;
388 writeb(temp, i2c_imx->base + IMX_I2C_I2CR);
389 }
390 dev_dbg(&i2c_imx->adapter.dev,
391 "<%s> transfer message: %d\n", __func__, i);
392 /* write/read data */
393#ifdef CONFIG_I2C_DEBUG_BUS
394 temp = readb(i2c_imx->base + IMX_I2C_I2CR);
395 dev_dbg(&i2c_imx->adapter.dev, "<%s> CONTROL: IEN=%d, IIEN=%d, "
396 "MSTA=%d, MTX=%d, TXAK=%d, RSTA=%d\n", __func__,
397 (temp & I2CR_IEN ? 1 : 0), (temp & I2CR_IIEN ? 1 : 0),
398 (temp & I2CR_MSTA ? 1 : 0), (temp & I2CR_MTX ? 1 : 0),
399 (temp & I2CR_TXAK ? 1 : 0), (temp & I2CR_RSTA ? 1 : 0));
400 temp = readb(i2c_imx->base + IMX_I2C_I2SR);
401 dev_dbg(&i2c_imx->adapter.dev,
402 "<%s> STATUS: ICF=%d, IAAS=%d, IBB=%d, "
403 "IAL=%d, SRW=%d, IIF=%d, RXAK=%d\n", __func__,
404 (temp & I2SR_ICF ? 1 : 0), (temp & I2SR_IAAS ? 1 : 0),
405 (temp & I2SR_IBB ? 1 : 0), (temp & I2SR_IAL ? 1 : 0),
406 (temp & I2SR_SRW ? 1 : 0), (temp & I2SR_IIF ? 1 : 0),
407 (temp & I2SR_RXAK ? 1 : 0));
408#endif
409 if (msgs[i].flags & I2C_M_RD)
410 result = i2c_imx_read(i2c_imx, &msgs[i]);
411 else
412 result = i2c_imx_write(i2c_imx, &msgs[i]);
413 }
414
415fail0:
416 /* Stop I2C transfer */
417 i2c_imx_stop(i2c_imx);
418
419 dev_dbg(&i2c_imx->adapter.dev, "<%s> exit with: %s: %d\n", __func__,
420 (result < 0) ? "error" : "success msg",
421 (result < 0) ? result : num);
422 return (result < 0) ? result : num;
423}
424
425static u32 i2c_imx_func(struct i2c_adapter *adapter)
426{
427 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
428}
429
430static struct i2c_algorithm i2c_imx_algo = {
431 .master_xfer = i2c_imx_xfer,
432 .functionality = i2c_imx_func,
433};
434
435static int __init i2c_imx_probe(struct platform_device *pdev)
436{
437 struct imx_i2c_struct *i2c_imx;
438 struct resource *res;
439 struct imxi2c_platform_data *pdata;
440 void __iomem *base;
441 resource_size_t res_size;
442 int irq;
443 int ret;
444
445 dev_dbg(&pdev->dev, "<%s>\n", __func__);
446
447 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
448 if (!res) {
449 dev_err(&pdev->dev, "can't get device resources\n");
450 return -ENOENT;
451 }
452 irq = platform_get_irq(pdev, 0);
453 if (irq < 0) {
454 dev_err(&pdev->dev, "can't get irq number\n");
455 return -ENOENT;
456 }
457
458 pdata = pdev->dev.platform_data;
459
460 if (pdata && pdata->init) {
461 ret = pdata->init(&pdev->dev);
462 if (ret)
463 return ret;
464 }
465
466 res_size = resource_size(res);
467 base = ioremap(res->start, res_size);
468 if (!base) {
469 dev_err(&pdev->dev, "ioremap failed\n");
470 ret = -EIO;
471 goto fail0;
472 }
473
474 i2c_imx = kzalloc(sizeof(struct imx_i2c_struct), GFP_KERNEL);
475 if (!i2c_imx) {
476 dev_err(&pdev->dev, "can't allocate interface\n");
477 ret = -ENOMEM;
478 goto fail1;
479 }
480
481 if (!request_mem_region(res->start, res_size, DRIVER_NAME)) {
482 ret = -EBUSY;
483 goto fail2;
484 }
485
486 /* Setup i2c_imx driver structure */
487 strcpy(i2c_imx->adapter.name, pdev->name);
488 i2c_imx->adapter.owner = THIS_MODULE;
489 i2c_imx->adapter.algo = &i2c_imx_algo;
490 i2c_imx->adapter.dev.parent = &pdev->dev;
491 i2c_imx->adapter.nr = pdev->id;
492 i2c_imx->irq = irq;
493 i2c_imx->base = base;
494 i2c_imx->res = res;
495
496 /* Get I2C clock */
497 i2c_imx->clk = clk_get(&pdev->dev, "i2c_clk");
498 if (IS_ERR(i2c_imx->clk)) {
499 ret = PTR_ERR(i2c_imx->clk);
500 dev_err(&pdev->dev, "can't get I2C clock\n");
501 goto fail3;
502 }
503 clk_enable(i2c_imx->clk);
504
505 /* Request IRQ */
506 ret = request_irq(i2c_imx->irq, i2c_imx_isr, 0, pdev->name, i2c_imx);
507 if (ret) {
508 dev_err(&pdev->dev, "can't claim irq %d\n", i2c_imx->irq);
509 goto fail4;
510 }
511
512 /* Init queue */
513 init_waitqueue_head(&i2c_imx->queue);
514
515 /* Set up adapter data */
516 i2c_set_adapdata(&i2c_imx->adapter, i2c_imx);
517
518 /* Set up clock divider */
519 if (pdata && pdata->bitrate)
520 i2c_imx_set_clk(i2c_imx, pdata->bitrate);
521 else
522 i2c_imx_set_clk(i2c_imx, IMX_I2C_BIT_RATE);
523
524 /* Set up chip registers to defaults */
525 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
526 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
527
528 /* Add I2C adapter */
529 ret = i2c_add_numbered_adapter(&i2c_imx->adapter);
530 if (ret < 0) {
531 dev_err(&pdev->dev, "registration failed\n");
532 goto fail5;
533 }
534
535 /* Set up platform driver data */
536 platform_set_drvdata(pdev, i2c_imx);
537
538 dev_dbg(&i2c_imx->adapter.dev, "claimed irq %d\n", i2c_imx->irq);
539 dev_dbg(&i2c_imx->adapter.dev, "device resources from 0x%x to 0x%x\n",
540 i2c_imx->res->start, i2c_imx->res->end);
541 dev_dbg(&i2c_imx->adapter.dev, "allocated %d bytes at 0x%x \n",
542 res_size, i2c_imx->res->start);
543 dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
544 i2c_imx->adapter.name);
545 dev_dbg(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
546
547 return 0; /* Return OK */
548
549fail5:
550 free_irq(i2c_imx->irq, i2c_imx);
551fail4:
552 clk_disable(i2c_imx->clk);
553 clk_put(i2c_imx->clk);
554fail3:
555 release_mem_region(i2c_imx->res->start, resource_size(res));
556fail2:
557 kfree(i2c_imx);
558fail1:
559 iounmap(base);
560fail0:
561 if (pdata && pdata->exit)
562 pdata->exit(&pdev->dev);
563 return ret; /* Return error number */
564}
565
566static int __exit i2c_imx_remove(struct platform_device *pdev)
567{
568 struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
569 struct imxi2c_platform_data *pdata = pdev->dev.platform_data;
570
571 /* remove adapter */
572 dev_dbg(&i2c_imx->adapter.dev, "adapter removed\n");
573 i2c_del_adapter(&i2c_imx->adapter);
574 platform_set_drvdata(pdev, NULL);
575
576 /* free interrupt */
577 free_irq(i2c_imx->irq, i2c_imx);
578
579 /* setup chip registers to defaults */
580 writeb(0, i2c_imx->base + IMX_I2C_IADR);
581 writeb(0, i2c_imx->base + IMX_I2C_IFDR);
582 writeb(0, i2c_imx->base + IMX_I2C_I2CR);
583 writeb(0, i2c_imx->base + IMX_I2C_I2SR);
584
585 /* Shut down hardware */
586 if (pdata && pdata->exit)
587 pdata->exit(&pdev->dev);
588
589 /* Disable I2C clock */
590 clk_disable(i2c_imx->clk);
591 clk_put(i2c_imx->clk);
592
593 release_mem_region(i2c_imx->res->start, resource_size(i2c_imx->res));
594 iounmap(i2c_imx->base);
595 kfree(i2c_imx);
596 return 0;
597}
598
599static struct platform_driver i2c_imx_driver = {
600 .probe = i2c_imx_probe,
601 .remove = __exit_p(i2c_imx_remove),
602 .driver = {
603 .name = DRIVER_NAME,
604 .owner = THIS_MODULE,
605 }
606};
607
608static int __init i2c_adap_imx_init(void)
609{
610 return platform_driver_probe(&i2c_imx_driver, i2c_imx_probe);
611}
612
613static void __exit i2c_adap_imx_exit(void)
614{
615 platform_driver_unregister(&i2c_imx_driver);
616}
617
618module_init(i2c_adap_imx_init);
619module_exit(i2c_adap_imx_exit);
620
621MODULE_LICENSE("GPL");
622MODULE_AUTHOR("Darius Augulis");
623MODULE_DESCRIPTION("I2C adapter driver for IMX I2C bus");
624MODULE_ALIAS("platform:" DRIVER_NAME);
diff --git a/drivers/i2c/busses/i2c-mpc.c b/drivers/i2c/busses/i2c-mpc.c
index 26bf37010586..4af5c09f0e8f 100644
--- a/drivers/i2c/busses/i2c-mpc.c
+++ b/drivers/i2c/busses/i2c-mpc.c
@@ -20,18 +20,21 @@
20#include <linux/of_platform.h> 20#include <linux/of_platform.h>
21#include <linux/of_i2c.h> 21#include <linux/of_i2c.h>
22 22
23#include <asm/io.h> 23#include <linux/io.h>
24#include <linux/fsl_devices.h> 24#include <linux/fsl_devices.h>
25#include <linux/i2c.h> 25#include <linux/i2c.h>
26#include <linux/interrupt.h> 26#include <linux/interrupt.h>
27#include <linux/delay.h> 27#include <linux/delay.h>
28 28
29#include <asm/mpc52xx.h>
30#include <sysdev/fsl_soc.h>
31
29#define DRV_NAME "mpc-i2c" 32#define DRV_NAME "mpc-i2c"
30 33
31#define MPC_I2C_FDR 0x04 34#define MPC_I2C_FDR 0x04
32#define MPC_I2C_CR 0x08 35#define MPC_I2C_CR 0x08
33#define MPC_I2C_SR 0x0c 36#define MPC_I2C_SR 0x0c
34#define MPC_I2C_DR 0x10 37#define MPC_I2C_DR 0x10
35#define MPC_I2C_DFSRR 0x14 38#define MPC_I2C_DFSRR 0x14
36 39
37#define CCR_MEN 0x80 40#define CCR_MEN 0x80
@@ -50,15 +53,27 @@
50#define CSR_RXAK 0x01 53#define CSR_RXAK 0x01
51 54
52struct mpc_i2c { 55struct mpc_i2c {
56 struct device *dev;
53 void __iomem *base; 57 void __iomem *base;
54 u32 interrupt; 58 u32 interrupt;
55 wait_queue_head_t queue; 59 wait_queue_head_t queue;
56 struct i2c_adapter adap; 60 struct i2c_adapter adap;
57 int irq; 61 int irq;
58 u32 flags;
59}; 62};
60 63
61static __inline__ void writeccr(struct mpc_i2c *i2c, u32 x) 64struct mpc_i2c_divider {
65 u16 divider;
66 u16 fdr; /* including dfsrr */
67};
68
69struct mpc_i2c_match_data {
70 void (*setclock)(struct device_node *node,
71 struct mpc_i2c *i2c,
72 u32 clock, u32 prescaler);
73 u32 prescaler;
74};
75
76static inline void writeccr(struct mpc_i2c *i2c, u32 x)
62{ 77{
63 writeb(x, i2c->base + MPC_I2C_CR); 78 writeb(x, i2c->base + MPC_I2C_CR);
64} 79}
@@ -100,12 +115,11 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
100 u32 x; 115 u32 x;
101 int result = 0; 116 int result = 0;
102 117
103 if (i2c->irq == NO_IRQ) 118 if (i2c->irq == NO_IRQ) {
104 {
105 while (!(readb(i2c->base + MPC_I2C_SR) & CSR_MIF)) { 119 while (!(readb(i2c->base + MPC_I2C_SR) & CSR_MIF)) {
106 schedule(); 120 schedule();
107 if (time_after(jiffies, orig_jiffies + timeout)) { 121 if (time_after(jiffies, orig_jiffies + timeout)) {
108 pr_debug("I2C: timeout\n"); 122 dev_dbg(i2c->dev, "timeout\n");
109 writeccr(i2c, 0); 123 writeccr(i2c, 0);
110 result = -EIO; 124 result = -EIO;
111 break; 125 break;
@@ -119,7 +133,7 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
119 (i2c->interrupt & CSR_MIF), timeout); 133 (i2c->interrupt & CSR_MIF), timeout);
120 134
121 if (unlikely(!(i2c->interrupt & CSR_MIF))) { 135 if (unlikely(!(i2c->interrupt & CSR_MIF))) {
122 pr_debug("I2C: wait timeout\n"); 136 dev_dbg(i2c->dev, "wait timeout\n");
123 writeccr(i2c, 0); 137 writeccr(i2c, 0);
124 result = -ETIMEDOUT; 138 result = -ETIMEDOUT;
125 } 139 }
@@ -132,17 +146,17 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
132 return result; 146 return result;
133 147
134 if (!(x & CSR_MCF)) { 148 if (!(x & CSR_MCF)) {
135 pr_debug("I2C: unfinished\n"); 149 dev_dbg(i2c->dev, "unfinished\n");
136 return -EIO; 150 return -EIO;
137 } 151 }
138 152
139 if (x & CSR_MAL) { 153 if (x & CSR_MAL) {
140 pr_debug("I2C: MAL\n"); 154 dev_dbg(i2c->dev, "MAL\n");
141 return -EIO; 155 return -EIO;
142 } 156 }
143 157
144 if (writing && (x & CSR_RXAK)) { 158 if (writing && (x & CSR_RXAK)) {
145 pr_debug("I2C: No RXAK\n"); 159 dev_dbg(i2c->dev, "No RXAK\n");
146 /* generate stop */ 160 /* generate stop */
147 writeccr(i2c, CCR_MEN); 161 writeccr(i2c, CCR_MEN);
148 return -EIO; 162 return -EIO;
@@ -150,18 +164,181 @@ static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
150 return 0; 164 return 0;
151} 165}
152 166
153static void mpc_i2c_setclock(struct mpc_i2c *i2c) 167#ifdef CONFIG_PPC_52xx
168static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] = {
169 {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
170 {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
171 {36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
172 {52, 0x63}, {56, 0x29}, {60, 0x41}, {64, 0x2a},
173 {68, 0x07}, {72, 0x2b}, {80, 0x2c}, {88, 0x09},
174 {96, 0x2d}, {104, 0x0a}, {112, 0x2e}, {120, 0x81},
175 {128, 0x2f}, {136, 0x47}, {144, 0x0c}, {160, 0x30},
176 {176, 0x49}, {192, 0x31}, {208, 0x4a}, {224, 0x32},
177 {240, 0x0f}, {256, 0x33}, {272, 0x87}, {288, 0x10},
178 {320, 0x34}, {352, 0x89}, {384, 0x35}, {416, 0x8a},
179 {448, 0x36}, {480, 0x13}, {512, 0x37}, {576, 0x14},
180 {640, 0x38}, {768, 0x39}, {896, 0x3a}, {960, 0x17},
181 {1024, 0x3b}, {1152, 0x18}, {1280, 0x3c}, {1536, 0x3d},
182 {1792, 0x3e}, {1920, 0x1b}, {2048, 0x3f}, {2304, 0x1c},
183 {2560, 0x1d}, {3072, 0x1e}, {3584, 0x7e}, {3840, 0x1f},
184 {4096, 0x7f}, {4608, 0x5c}, {5120, 0x5d}, {6144, 0x5e},
185 {7168, 0xbe}, {7680, 0x5f}, {8192, 0xbf}, {9216, 0x9c},
186 {10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
187};
188
189int mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock, int prescaler)
190{
191 const struct mpc52xx_i2c_divider *div = NULL;
192 unsigned int pvr = mfspr(SPRN_PVR);
193 u32 divider;
194 int i;
195
196 if (!clock)
197 return -EINVAL;
198
199 /* Determine divider value */
200 divider = mpc52xx_find_ipb_freq(node) / clock;
201
202 /*
203 * We want to choose an FDR/DFSR that generates an I2C bus speed that
204 * is equal to or lower than the requested speed.
205 */
206 for (i = 0; i < ARRAY_SIZE(mpc52xx_i2c_dividers); i++) {
207 div = &mpc_i2c_dividers_52xx[i];
208 /* Old MPC5200 rev A CPUs do not support the high bits */
209 if (div->fdr & 0xc0 && pvr == 0x80822011)
210 continue;
211 if (div->divider >= divider)
212 break;
213 }
214
215 return div ? (int)div->fdr : -EINVAL;
216}
217
218static void mpc_i2c_setclock_52xx(struct device_node *node,
219 struct mpc_i2c *i2c,
220 u32 clock, u32 prescaler)
154{ 221{
155 /* Set clock and filters */ 222 int fdr = mpc52xx_i2c_get_fdr(node, clock, prescaler);
156 if (i2c->flags & FSL_I2C_DEV_SEPARATE_DFSRR) { 223
157 writeb(0x31, i2c->base + MPC_I2C_FDR); 224 if (fdr < 0)
158 writeb(0x10, i2c->base + MPC_I2C_DFSRR); 225 fdr = 0x3f; /* backward compatibility */
159 } else if (i2c->flags & FSL_I2C_DEV_CLOCK_5200) 226 writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
160 writeb(0x3f, i2c->base + MPC_I2C_FDR); 227 dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
161 else 228}
162 writel(0x1031, i2c->base + MPC_I2C_FDR); 229#else /* !CONFIG_PPC_52xx */
230static void mpc_i2c_setclock_52xx(struct device_node *node,
231 struct mpc_i2c *i2c,
232 u32 clock, u32 prescaler)
233{
234}
235#endif /* CONFIG_PPC_52xx*/
236
237#ifdef CONFIG_FSL_SOC
238static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] = {
239 {160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
240 {288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
241 {416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
242 {544, 0x0b03}, {576, 0x0104}, {608, 0x1603}, {640, 0x0105},
243 {672, 0x2003}, {704, 0x0b05}, {736, 0x2b03}, {768, 0x0106},
244 {800, 0x3603}, {832, 0x0b06}, {896, 0x012a}, {960, 0x0107},
245 {1024, 0x012b}, {1088, 0x1607}, {1152, 0x0108}, {1216, 0x2b07},
246 {1280, 0x0109}, {1408, 0x1609}, {1536, 0x010a}, {1664, 0x160a},
247 {1792, 0x012e}, {1920, 0x010b}, {2048, 0x012f}, {2176, 0x2b0b},
248 {2304, 0x010c}, {2560, 0x010d}, {2816, 0x2b0d}, {3072, 0x010e},
249 {3328, 0x2b0e}, {3584, 0x0132}, {3840, 0x010f}, {4096, 0x0133},
250 {4608, 0x0110}, {5120, 0x0111}, {6144, 0x0112}, {7168, 0x0136},
251 {7680, 0x0113}, {8192, 0x0137}, {9216, 0x0114}, {10240, 0x0115},
252 {12288, 0x0116}, {14336, 0x013a}, {15360, 0x0117}, {16384, 0x013b},
253 {18432, 0x0118}, {20480, 0x0119}, {24576, 0x011a}, {28672, 0x013e},
254 {30720, 0x011b}, {32768, 0x013f}, {36864, 0x011c}, {40960, 0x011d},
255 {49152, 0x011e}, {61440, 0x011f}
256};
257
258u32 mpc_i2c_get_sec_cfg_8xxx(void)
259{
260 struct device_node *node = NULL;
261 u32 __iomem *reg;
262 u32 val = 0;
263
264 node = of_find_node_by_name(NULL, "global-utilities");
265 if (node) {
266 const u32 *prop = of_get_property(node, "reg", NULL);
267 if (prop) {
268 /*
269 * Map and check POR Device Status Register 2
270 * (PORDEVSR2) at 0xE0014
271 */
272 reg = ioremap(get_immrbase() + *prop + 0x14, 0x4);
273 if (!reg)
274 printk(KERN_ERR
275 "Error: couldn't map PORDEVSR2\n");
276 else
277 val = in_be32(reg) & 0x00000080; /* sec-cfg */
278 iounmap(reg);
279 }
280 }
281 if (node)
282 of_node_put(node);
283
284 return val;
163} 285}
164 286
287int mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock, u32 prescaler)
288{
289 const struct mpc_i2c_divider *div = NULL;
290 u32 divider;
291 int i;
292
293 if (!clock)
294 return -EINVAL;
295
296 /* Determine proper divider value */
297 if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))
298 prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2;
299 if (!prescaler)
300 prescaler = 1;
301
302 divider = fsl_get_sys_freq() / clock / prescaler;
303
304 pr_debug("I2C: src_clock=%d clock=%d divider=%d\n",
305 fsl_get_sys_freq(), clock, divider);
306
307 /*
308 * We want to choose an FDR/DFSR that generates an I2C bus speed that
309 * is equal to or lower than the requested speed.
310 */
311 for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_8xxx); i++) {
312 div = &mpc_i2c_dividers_8xxx[i];
313 if (div->divider >= divider)
314 break;
315 }
316
317 return div ? (int)div->fdr : -EINVAL;
318}
319
320static void mpc_i2c_setclock_8xxx(struct device_node *node,
321 struct mpc_i2c *i2c,
322 u32 clock, u32 prescaler)
323{
324 int fdr = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
325
326 if (fdr < 0)
327 fdr = 0x1031; /* backward compatibility */
328 writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
329 writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR);
330 dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",
331 clock, fdr >> 8, fdr & 0xff);
332}
333
334#else /* !CONFIG_FSL_SOC */
335static void mpc_i2c_setclock_8xxx(struct device_node *node,
336 struct mpc_i2c *i2c,
337 u32 clock, u32 prescaler)
338{
339}
340#endif /* CONFIG_FSL_SOC */
341
165static void mpc_i2c_start(struct mpc_i2c *i2c) 342static void mpc_i2c_start(struct mpc_i2c *i2c)
166{ 343{
167 /* Clear arbitration */ 344 /* Clear arbitration */
@@ -176,7 +353,7 @@ static void mpc_i2c_stop(struct mpc_i2c *i2c)
176} 353}
177 354
178static int mpc_write(struct mpc_i2c *i2c, int target, 355static int mpc_write(struct mpc_i2c *i2c, int target,
179 const u8 * data, int length, int restart) 356 const u8 *data, int length, int restart)
180{ 357{
181 int i, result; 358 int i, result;
182 unsigned timeout = i2c->adap.timeout; 359 unsigned timeout = i2c->adap.timeout;
@@ -207,7 +384,7 @@ static int mpc_write(struct mpc_i2c *i2c, int target,
207} 384}
208 385
209static int mpc_read(struct mpc_i2c *i2c, int target, 386static int mpc_read(struct mpc_i2c *i2c, int target,
210 u8 * data, int length, int restart) 387 u8 *data, int length, int restart)
211{ 388{
212 unsigned timeout = i2c->adap.timeout; 389 unsigned timeout = i2c->adap.timeout;
213 int i, result; 390 int i, result;
@@ -264,12 +441,12 @@ static int mpc_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
264 /* Allow bus up to 1s to become not busy */ 441 /* Allow bus up to 1s to become not busy */
265 while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) { 442 while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {
266 if (signal_pending(current)) { 443 if (signal_pending(current)) {
267 pr_debug("I2C: Interrupted\n"); 444 dev_dbg(i2c->dev, "Interrupted\n");
268 writeccr(i2c, 0); 445 writeccr(i2c, 0);
269 return -EINTR; 446 return -EINTR;
270 } 447 }
271 if (time_after(jiffies, orig_jiffies + HZ)) { 448 if (time_after(jiffies, orig_jiffies + HZ)) {
272 pr_debug("I2C: timeout\n"); 449 dev_dbg(i2c->dev, "timeout\n");
273 if (readb(i2c->base + MPC_I2C_SR) == 450 if (readb(i2c->base + MPC_I2C_SR) ==
274 (CSR_MCF | CSR_MBB | CSR_RXAK)) 451 (CSR_MCF | CSR_MBB | CSR_RXAK))
275 mpc_i2c_fixup(i2c); 452 mpc_i2c_fixup(i2c);
@@ -280,9 +457,10 @@ static int mpc_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
280 457
281 for (i = 0; ret >= 0 && i < num; i++) { 458 for (i = 0; ret >= 0 && i < num; i++) {
282 pmsg = &msgs[i]; 459 pmsg = &msgs[i];
283 pr_debug("Doing %s %d bytes to 0x%02x - %d of %d messages\n", 460 dev_dbg(i2c->dev,
284 pmsg->flags & I2C_M_RD ? "read" : "write", 461 "Doing %s %d bytes to 0x%02x - %d of %d messages\n",
285 pmsg->len, pmsg->addr, i + 1, num); 462 pmsg->flags & I2C_M_RD ? "read" : "write",
463 pmsg->len, pmsg->addr, i + 1, num);
286 if (pmsg->flags & I2C_M_RD) 464 if (pmsg->flags & I2C_M_RD)
287 ret = 465 ret =
288 mpc_read(i2c, pmsg->addr, pmsg->buf, pmsg->len, i); 466 mpc_read(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
@@ -311,27 +489,26 @@ static struct i2c_adapter mpc_ops = {
311 .timeout = HZ, 489 .timeout = HZ,
312}; 490};
313 491
314static int __devinit fsl_i2c_probe(struct of_device *op, const struct of_device_id *match) 492static int __devinit fsl_i2c_probe(struct of_device *op,
493 const struct of_device_id *match)
315{ 494{
316 int result = 0;
317 struct mpc_i2c *i2c; 495 struct mpc_i2c *i2c;
496 const u32 *prop;
497 u32 clock = 0;
498 int result = 0;
499 int plen;
318 500
319 i2c = kzalloc(sizeof(*i2c), GFP_KERNEL); 501 i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
320 if (!i2c) 502 if (!i2c)
321 return -ENOMEM; 503 return -ENOMEM;
322 504
323 if (of_get_property(op->node, "dfsrr", NULL)) 505 i2c->dev = &op->dev; /* for debug and error output */
324 i2c->flags |= FSL_I2C_DEV_SEPARATE_DFSRR;
325
326 if (of_device_is_compatible(op->node, "fsl,mpc5200-i2c") ||
327 of_device_is_compatible(op->node, "mpc5200-i2c"))
328 i2c->flags |= FSL_I2C_DEV_CLOCK_5200;
329 506
330 init_waitqueue_head(&i2c->queue); 507 init_waitqueue_head(&i2c->queue);
331 508
332 i2c->base = of_iomap(op->node, 0); 509 i2c->base = of_iomap(op->node, 0);
333 if (!i2c->base) { 510 if (!i2c->base) {
334 printk(KERN_ERR "i2c-mpc - failed to map controller\n"); 511 dev_err(i2c->dev, "failed to map controller\n");
335 result = -ENOMEM; 512 result = -ENOMEM;
336 goto fail_map; 513 goto fail_map;
337 } 514 }
@@ -341,12 +518,27 @@ static int __devinit fsl_i2c_probe(struct of_device *op, const struct of_device_
341 result = request_irq(i2c->irq, mpc_i2c_isr, 518 result = request_irq(i2c->irq, mpc_i2c_isr,
342 IRQF_SHARED, "i2c-mpc", i2c); 519 IRQF_SHARED, "i2c-mpc", i2c);
343 if (result < 0) { 520 if (result < 0) {
344 printk(KERN_ERR "i2c-mpc - failed to attach interrupt\n"); 521 dev_err(i2c->dev, "failed to attach interrupt\n");
345 goto fail_request; 522 goto fail_request;
346 } 523 }
347 } 524 }
348 525
349 mpc_i2c_setclock(i2c); 526 if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
527 prop = of_get_property(op->node, "clock-frequency", &plen);
528 if (prop && plen == sizeof(u32))
529 clock = *prop;
530
531 if (match->data) {
532 struct mpc_i2c_match_data *data =
533 (struct mpc_i2c_match_data *)match->data;
534 data->setclock(op->node, i2c, clock, data->prescaler);
535 } else {
536 /* Backwards compatibility */
537 if (of_get_property(op->node, "dfsrr", NULL))
538 mpc_i2c_setclock_8xxx(op->node, i2c,
539 clock, 0);
540 }
541 }
350 542
351 dev_set_drvdata(&op->dev, i2c); 543 dev_set_drvdata(&op->dev, i2c);
352 544
@@ -356,7 +548,7 @@ static int __devinit fsl_i2c_probe(struct of_device *op, const struct of_device_
356 548
357 result = i2c_add_adapter(&i2c->adap); 549 result = i2c_add_adapter(&i2c->adap);
358 if (result < 0) { 550 if (result < 0) {
359 printk(KERN_ERR "i2c-mpc - failed to add adapter\n"); 551 dev_err(i2c->dev, "failed to add adapter\n");
360 goto fail_add; 552 goto fail_add;
361 } 553 }
362 of_register_i2c_devices(&i2c->adap, op->node); 554 of_register_i2c_devices(&i2c->adap, op->node);
@@ -368,7 +560,7 @@ static int __devinit fsl_i2c_probe(struct of_device *op, const struct of_device_
368 free_irq(i2c->irq, i2c); 560 free_irq(i2c->irq, i2c);
369 fail_request: 561 fail_request:
370 irq_dispose_mapping(i2c->irq); 562 irq_dispose_mapping(i2c->irq);
371 iounmap(i2c->base); 563 iounmap(i2c->base);
372 fail_map: 564 fail_map:
373 kfree(i2c); 565 kfree(i2c);
374 return result; 566 return result;
@@ -391,9 +583,43 @@ static int __devexit fsl_i2c_remove(struct of_device *op)
391}; 583};
392 584
393static const struct of_device_id mpc_i2c_of_match[] = { 585static const struct of_device_id mpc_i2c_of_match[] = {
394 {.compatible = "fsl-i2c",}, 586 {.compatible = "mpc5200-i2c",
587 .data = &(struct mpc_i2c_match_data) {
588 .setclock = mpc_i2c_setclock_52xx,
589 },
590 },
591 {.compatible = "fsl,mpc5200b-i2c",
592 .data = &(struct mpc_i2c_match_data) {
593 .setclock = mpc_i2c_setclock_52xx,
594 },
595 },
596 {.compatible = "fsl,mpc5200-i2c",
597 .data = &(struct mpc_i2c_match_data) {
598 .setclock = mpc_i2c_setclock_52xx,
599 },
600 },
601 {.compatible = "fsl,mpc8313-i2c",
602 .data = &(struct mpc_i2c_match_data) {
603 .setclock = mpc_i2c_setclock_8xxx,
604 },
605 },
606 {.compatible = "fsl,mpc8543-i2c",
607 .data = &(struct mpc_i2c_match_data) {
608 .setclock = mpc_i2c_setclock_8xxx,
609 .prescaler = 2,
610 },
611 },
612 {.compatible = "fsl,mpc8544-i2c",
613 .data = &(struct mpc_i2c_match_data) {
614 .setclock = mpc_i2c_setclock_8xxx,
615 .prescaler = 3,
616 },
617 /* Backward compatibility */
618 },
619 {.compatible = "fsl-i2c", },
395 {}, 620 {},
396}; 621};
622
397MODULE_DEVICE_TABLE(of, mpc_i2c_of_match); 623MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
398 624
399 625
@@ -414,7 +640,7 @@ static int __init fsl_i2c_init(void)
414 640
415 rv = of_register_platform_driver(&mpc_i2c_driver); 641 rv = of_register_platform_driver(&mpc_i2c_driver);
416 if (rv) 642 if (rv)
417 printk(KERN_ERR DRV_NAME 643 printk(KERN_ERR DRV_NAME
418 " of_register_platform_driver failed (%i)\n", rv); 644 " of_register_platform_driver failed (%i)\n", rv);
419 return rv; 645 return rv;
420} 646}
@@ -428,6 +654,6 @@ module_init(fsl_i2c_init);
428module_exit(fsl_i2c_exit); 654module_exit(fsl_i2c_exit);
429 655
430MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>"); 656MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
431MODULE_DESCRIPTION 657MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
432 ("I2C-Bus adapter for MPC107 bridge and MPC824x/85xx/52xx processors"); 658 "MPC824x/85xx/52xx processors");
433MODULE_LICENSE("GPL"); 659MODULE_LICENSE("GPL");
diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c
index 5b7f95641ba4..1691ef0f1ee1 100644
--- a/drivers/i2c/busses/i2c-s3c2410.c
+++ b/drivers/i2c/busses/i2c-s3c2410.c
@@ -1,6 +1,6 @@
1/* linux/drivers/i2c/busses/i2c-s3c2410.c 1/* linux/drivers/i2c/busses/i2c-s3c2410.c
2 * 2 *
3 * Copyright (C) 2004,2005 Simtec Electronics 3 * Copyright (C) 2004,2005,2009 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk> 4 * Ben Dooks <ben@simtec.co.uk>
5 * 5 *
6 * S3C2410 I2C Controller 6 * S3C2410 I2C Controller
@@ -590,18 +590,6 @@ static int s3c24xx_i2c_calcdivisor(unsigned long clkin, unsigned int wanted,
590 return clkin / (calc_divs * calc_div1); 590 return clkin / (calc_divs * calc_div1);
591} 591}
592 592
593/* freq_acceptable
594 *
595 * test wether a frequency is within the acceptable range of error
596*/
597
598static inline int freq_acceptable(unsigned int freq, unsigned int wanted)
599{
600 int diff = freq - wanted;
601
602 return diff >= -2 && diff <= 2;
603}
604
605/* s3c24xx_i2c_clockrate 593/* s3c24xx_i2c_clockrate
606 * 594 *
607 * work out a divisor for the user requested frequency setting, 595 * work out a divisor for the user requested frequency setting,
@@ -614,44 +602,28 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
614 struct s3c2410_platform_i2c *pdata = i2c->dev->platform_data; 602 struct s3c2410_platform_i2c *pdata = i2c->dev->platform_data;
615 unsigned long clkin = clk_get_rate(i2c->clk); 603 unsigned long clkin = clk_get_rate(i2c->clk);
616 unsigned int divs, div1; 604 unsigned int divs, div1;
605 unsigned long target_frequency;
617 u32 iiccon; 606 u32 iiccon;
618 int freq; 607 int freq;
619 int start, end;
620 608
621 i2c->clkrate = clkin; 609 i2c->clkrate = clkin;
622 clkin /= 1000; /* clkin now in KHz */ 610 clkin /= 1000; /* clkin now in KHz */
623 611
624 dev_dbg(i2c->dev, "pdata %p, freq %lu %lu..%lu\n", 612 dev_dbg(i2c->dev, "pdata desired frequency %lu\n", pdata->frequency);
625 pdata, pdata->bus_freq, pdata->min_freq, pdata->max_freq);
626
627 if (pdata->bus_freq != 0) {
628 freq = s3c24xx_i2c_calcdivisor(clkin, pdata->bus_freq/1000,
629 &div1, &divs);
630 if (freq_acceptable(freq, pdata->bus_freq/1000))
631 goto found;
632 }
633
634 /* ok, we may have to search for something suitable... */
635 613
636 start = (pdata->max_freq == 0) ? pdata->bus_freq : pdata->max_freq; 614 target_frequency = pdata->frequency ? pdata->frequency : 100000;
637 end = pdata->min_freq;
638 615
639 start /= 1000; 616 target_frequency /= 1000; /* Target frequency now in KHz */
640 end /= 1000;
641 617
642 /* search loop... */ 618 freq = s3c24xx_i2c_calcdivisor(clkin, target_frequency, &div1, &divs);
643 619
644 for (; start > end; start--) { 620 if (freq > target_frequency) {
645 freq = s3c24xx_i2c_calcdivisor(clkin, start, &div1, &divs); 621 dev_err(i2c->dev,
646 if (freq_acceptable(freq, start)) 622 "Unable to achieve desired frequency %luKHz." \
647 goto found; 623 " Lowest achievable %dKHz\n", target_frequency, freq);
624 return -EINVAL;
648 } 625 }
649 626
650 /* cannot find frequency spec */
651
652 return -EINVAL;
653
654 found:
655 *got = freq; 627 *got = freq;
656 628
657 iiccon = readl(i2c->regs + S3C2410_IICCON); 629 iiccon = readl(i2c->regs + S3C2410_IICCON);
@@ -663,6 +635,23 @@ static int s3c24xx_i2c_clockrate(struct s3c24xx_i2c *i2c, unsigned int *got)
663 635
664 writel(iiccon, i2c->regs + S3C2410_IICCON); 636 writel(iiccon, i2c->regs + S3C2410_IICCON);
665 637
638 if (s3c24xx_i2c_is2440(i2c)) {
639 unsigned long sda_delay;
640
641 if (pdata->sda_delay) {
642 sda_delay = (freq / 1000) * pdata->sda_delay;
643 sda_delay /= 1000000;
644 sda_delay = DIV_ROUND_UP(sda_delay, 5);
645 if (sda_delay > 3)
646 sda_delay = 3;
647 sda_delay |= S3C2410_IICLC_FILTER_ON;
648 } else
649 sda_delay = 0;
650
651 dev_dbg(i2c->dev, "IICLC=%08lx\n", sda_delay);
652 writel(sda_delay, i2c->regs + S3C2440_IICLC);
653 }
654
666 return 0; 655 return 0;
667} 656}
668 657
@@ -769,11 +758,8 @@ static int s3c24xx_i2c_init(struct s3c24xx_i2c *i2c)
769 758
770 /* check for s3c2440 i2c controller */ 759 /* check for s3c2440 i2c controller */
771 760
772 if (s3c24xx_i2c_is2440(i2c)) { 761 if (s3c24xx_i2c_is2440(i2c))
773 dev_dbg(i2c->dev, "S3C2440_IICLC=%08x\n", pdata->sda_delay); 762 writel(0x0, i2c->regs + S3C2440_IICLC);
774
775 writel(pdata->sda_delay, i2c->regs + S3C2440_IICLC);
776 }
777 763
778 return 0; 764 return 0;
779} 765}
@@ -1018,14 +1004,13 @@ static int __init i2c_adap_s3c_init(void)
1018 1004
1019 return ret; 1005 return ret;
1020} 1006}
1007subsys_initcall(i2c_adap_s3c_init);
1021 1008
1022static void __exit i2c_adap_s3c_exit(void) 1009static void __exit i2c_adap_s3c_exit(void)
1023{ 1010{
1024 platform_driver_unregister(&s3c2410_i2c_driver); 1011 platform_driver_unregister(&s3c2410_i2c_driver);
1025 platform_driver_unregister(&s3c2440_i2c_driver); 1012 platform_driver_unregister(&s3c2440_i2c_driver);
1026} 1013}
1027
1028module_init(i2c_adap_s3c_init);
1029module_exit(i2c_adap_s3c_exit); 1014module_exit(i2c_adap_s3c_exit);
1030 1015
1031MODULE_DESCRIPTION("S3C24XX I2C Bus driver"); 1016MODULE_DESCRIPTION("S3C24XX I2C Bus driver");
diff --git a/drivers/i2c/busses/i2c-s6000.c b/drivers/i2c/busses/i2c-s6000.c
new file mode 100644
index 000000000000..c91359f4965c
--- /dev/null
+++ b/drivers/i2c/busses/i2c-s6000.c
@@ -0,0 +1,407 @@
1/*
2 * drivers/i2c/busses/i2c-s6000.c
3 *
4 * Description: Driver for S6000 Family I2C Interface
5 * Copyright (c) 2008 emlix GmbH
6 * Author: Oskar Schirmer <os@emlix.com>
7 *
8 * Partially based on i2c-bfin-twi.c driver by <sonic.zhang@analog.com>
9 * Copyright (c) 2005-2007 Analog Devices, Inc.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA
24 */
25
26#include <linux/clk.h>
27#include <linux/err.h>
28#include <linux/module.h>
29#include <linux/kernel.h>
30#include <linux/init.h>
31#include <linux/delay.h>
32#include <linux/i2c.h>
33#include <linux/i2c/s6000.h>
34#include <linux/timer.h>
35#include <linux/spinlock.h>
36#include <linux/completion.h>
37#include <linux/interrupt.h>
38#include <linux/platform_device.h>
39
40#include <asm/io.h>
41#include "i2c-s6000.h"
42
43#define DRV_NAME "i2c-s6000"
44
45#define POLL_TIMEOUT (2 * HZ)
46
47struct s6i2c_if {
48 u8 __iomem *reg; /* memory mapped registers */
49 int irq;
50 spinlock_t lock;
51 struct i2c_msg *msgs; /* messages currently handled */
52 int msgs_num; /* nb of msgs to do */
53 int msgs_push; /* nb of msgs read/written */
54 int msgs_done; /* nb of msgs finally handled */
55 unsigned push; /* nb of bytes read/written in msg */
56 unsigned done; /* nb of bytes finally handled */
57 int timeout_count; /* timeout retries left */
58 struct timer_list timeout_timer;
59 struct i2c_adapter adap;
60 struct completion complete;
61 struct clk *clk;
62 struct resource *res;
63};
64
65static inline u16 i2c_rd16(struct s6i2c_if *iface, unsigned n)
66{
67 return readw(iface->reg + (n));
68}
69
70static inline void i2c_wr16(struct s6i2c_if *iface, unsigned n, u16 v)
71{
72 writew(v, iface->reg + (n));
73}
74
75static inline u32 i2c_rd32(struct s6i2c_if *iface, unsigned n)
76{
77 return readl(iface->reg + (n));
78}
79
80static inline void i2c_wr32(struct s6i2c_if *iface, unsigned n, u32 v)
81{
82 writel(v, iface->reg + (n));
83}
84
85static struct s6i2c_if s6i2c_if;
86
87static void s6i2c_handle_interrupt(struct s6i2c_if *iface)
88{
89 if (i2c_rd16(iface, S6_I2C_INTRSTAT) & (1 << S6_I2C_INTR_TXABRT)) {
90 i2c_rd16(iface, S6_I2C_CLRTXABRT);
91 i2c_wr16(iface, S6_I2C_INTRMASK, 0);
92 complete(&iface->complete);
93 return;
94 }
95 if (iface->msgs_done >= iface->msgs_num) {
96 dev_err(&iface->adap.dev, "s6i2c: spurious I2C irq: %04x\n",
97 i2c_rd16(iface, S6_I2C_INTRSTAT));
98 i2c_wr16(iface, S6_I2C_INTRMASK, 0);
99 return;
100 }
101 while ((iface->msgs_push < iface->msgs_num)
102 && (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_TFNF))) {
103 struct i2c_msg *m = &iface->msgs[iface->msgs_push];
104 if (!(m->flags & I2C_M_RD))
105 i2c_wr16(iface, S6_I2C_DATACMD, m->buf[iface->push]);
106 else
107 i2c_wr16(iface, S6_I2C_DATACMD,
108 1 << S6_I2C_DATACMD_READ);
109 if (++iface->push >= m->len) {
110 iface->push = 0;
111 iface->msgs_push += 1;
112 }
113 }
114 do {
115 struct i2c_msg *m = &iface->msgs[iface->msgs_done];
116 if (!(m->flags & I2C_M_RD)) {
117 if (iface->msgs_done < iface->msgs_push)
118 iface->msgs_done += 1;
119 else
120 break;
121 } else if (i2c_rd16(iface, S6_I2C_STATUS)
122 & (1 << S6_I2C_STATUS_RFNE)) {
123 m->buf[iface->done] = i2c_rd16(iface, S6_I2C_DATACMD);
124 if (++iface->done >= m->len) {
125 iface->done = 0;
126 iface->msgs_done += 1;
127 }
128 } else{
129 break;
130 }
131 } while (iface->msgs_done < iface->msgs_num);
132 if (iface->msgs_done >= iface->msgs_num) {
133 i2c_wr16(iface, S6_I2C_INTRMASK, 1 << S6_I2C_INTR_TXABRT);
134 complete(&iface->complete);
135 } else if (iface->msgs_push >= iface->msgs_num) {
136 i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXABRT) |
137 (1 << S6_I2C_INTR_RXFULL));
138 } else {
139 i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXABRT) |
140 (1 << S6_I2C_INTR_TXEMPTY) |
141 (1 << S6_I2C_INTR_RXFULL));
142 }
143}
144
145static irqreturn_t s6i2c_interrupt_entry(int irq, void *dev_id)
146{
147 struct s6i2c_if *iface = dev_id;
148 if (!(i2c_rd16(iface, S6_I2C_STATUS) & ((1 << S6_I2C_INTR_RXUNDER)
149 | (1 << S6_I2C_INTR_RXOVER)
150 | (1 << S6_I2C_INTR_RXFULL)
151 | (1 << S6_I2C_INTR_TXOVER)
152 | (1 << S6_I2C_INTR_TXEMPTY)
153 | (1 << S6_I2C_INTR_RDREQ)
154 | (1 << S6_I2C_INTR_TXABRT)
155 | (1 << S6_I2C_INTR_RXDONE)
156 | (1 << S6_I2C_INTR_ACTIVITY)
157 | (1 << S6_I2C_INTR_STOPDET)
158 | (1 << S6_I2C_INTR_STARTDET)
159 | (1 << S6_I2C_INTR_GENCALL))))
160 return IRQ_NONE;
161
162 spin_lock(&iface->lock);
163 del_timer(&iface->timeout_timer);
164 s6i2c_handle_interrupt(iface);
165 spin_unlock(&iface->lock);
166 return IRQ_HANDLED;
167}
168
169static void s6i2c_timeout(unsigned long data)
170{
171 struct s6i2c_if *iface = (struct s6i2c_if *)data;
172 unsigned long flags;
173
174 spin_lock_irqsave(&iface->lock, flags);
175 s6i2c_handle_interrupt(iface);
176 if (--iface->timeout_count > 0) {
177 iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
178 add_timer(&iface->timeout_timer);
179 } else {
180 complete(&iface->complete);
181 i2c_wr16(iface, S6_I2C_INTRMASK, 0);
182 }
183 spin_unlock_irqrestore(&iface->lock, flags);
184}
185
186static int s6i2c_master_xfer(struct i2c_adapter *adap,
187 struct i2c_msg *msgs, int num)
188{
189 struct s6i2c_if *iface = adap->algo_data;
190 int i;
191 if (num == 0)
192 return 0;
193 if (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_ACTIVITY))
194 yield();
195 i2c_wr16(iface, S6_I2C_INTRMASK, 0);
196 i2c_rd16(iface, S6_I2C_CLRINTR);
197 for (i = 0; i < num; i++) {
198 if (msgs[i].flags & I2C_M_TEN) {
199 dev_err(&adap->dev,
200 "s6i2c: 10 bits addr not supported\n");
201 return -EINVAL;
202 }
203 if (msgs[i].len == 0) {
204 dev_err(&adap->dev,
205 "s6i2c: zero length message not supported\n");
206 return -EINVAL;
207 }
208 if (msgs[i].addr != msgs[0].addr) {
209 dev_err(&adap->dev,
210 "s6i2c: multiple xfer cannot change target\n");
211 return -EINVAL;
212 }
213 }
214
215 iface->msgs = msgs;
216 iface->msgs_num = num;
217 iface->msgs_push = 0;
218 iface->msgs_done = 0;
219 iface->push = 0;
220 iface->done = 0;
221 iface->timeout_count = 10;
222 i2c_wr16(iface, S6_I2C_TAR, msgs[0].addr);
223 i2c_wr16(iface, S6_I2C_ENABLE, 1);
224 i2c_wr16(iface, S6_I2C_INTRMASK, (1 << S6_I2C_INTR_TXEMPTY) |
225 (1 << S6_I2C_INTR_TXABRT));
226
227 iface->timeout_timer.expires = jiffies + POLL_TIMEOUT;
228 add_timer(&iface->timeout_timer);
229 wait_for_completion(&iface->complete);
230 del_timer_sync(&iface->timeout_timer);
231 while (i2c_rd32(iface, S6_I2C_TXFLR) > 0)
232 schedule();
233 while (i2c_rd16(iface, S6_I2C_STATUS) & (1 << S6_I2C_STATUS_ACTIVITY))
234 schedule();
235
236 i2c_wr16(iface, S6_I2C_INTRMASK, 0);
237 i2c_wr16(iface, S6_I2C_ENABLE, 0);
238 return iface->msgs_done;
239}
240
241static u32 s6i2c_functionality(struct i2c_adapter *adap)
242{
243 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
244}
245
246static struct i2c_algorithm s6i2c_algorithm = {
247 .master_xfer = s6i2c_master_xfer,
248 .functionality = s6i2c_functionality,
249};
250
251static u16 __devinit nanoseconds_on_clk(struct s6i2c_if *iface, u32 ns)
252{
253 u32 dividend = ((clk_get_rate(iface->clk) / 1000) * ns) / 1000000;
254 if (dividend > 0xffff)
255 return 0xffff;
256 return dividend;
257}
258
259static int __devinit s6i2c_probe(struct platform_device *dev)
260{
261 struct s6i2c_if *iface = &s6i2c_if;
262 struct i2c_adapter *p_adap;
263 const char *clock;
264 int bus_num, rc;
265 spin_lock_init(&iface->lock);
266 init_completion(&iface->complete);
267 iface->irq = platform_get_irq(dev, 0);
268 if (iface->irq < 0) {
269 rc = iface->irq;
270 goto err_out;
271 }
272 iface->res = platform_get_resource(dev, IORESOURCE_MEM, 0);
273 if (!iface->res) {
274 rc = -ENXIO;
275 goto err_out;
276 }
277 iface->res = request_mem_region(iface->res->start,
278 resource_size(iface->res),
279 dev->dev.bus_id);
280 if (!iface->res) {
281 rc = -EBUSY;
282 goto err_out;
283 }
284 iface->reg = ioremap_nocache(iface->res->start,
285 resource_size(iface->res));
286 if (!iface->reg) {
287 rc = -ENOMEM;
288 goto err_reg;
289 }
290
291 clock = 0;
292 bus_num = -1;
293 if (dev->dev.platform_data) {
294 struct s6_i2c_platform_data *pdata = dev->dev.platform_data;
295 bus_num = pdata->bus_num;
296 clock = pdata->clock;
297 }
298 iface->clk = clk_get(&dev->dev, clock);
299 if (IS_ERR(iface->clk)) {
300 rc = PTR_ERR(iface->clk);
301 goto err_map;
302 }
303 rc = clk_enable(iface->clk);
304 if (rc < 0)
305 goto err_clk_put;
306 init_timer(&iface->timeout_timer);
307 iface->timeout_timer.function = s6i2c_timeout;
308 iface->timeout_timer.data = (unsigned long)iface;
309
310 p_adap = &iface->adap;
311 strlcpy(p_adap->name, dev->name, sizeof(p_adap->name));
312 p_adap->algo = &s6i2c_algorithm;
313 p_adap->algo_data = iface;
314 p_adap->nr = bus_num;
315 p_adap->class = 0;
316 p_adap->dev.parent = &dev->dev;
317 i2c_wr16(iface, S6_I2C_INTRMASK, 0);
318 rc = request_irq(iface->irq, s6i2c_interrupt_entry,
319 IRQF_SHARED, dev->name, iface);
320 if (rc) {
321 dev_err(&p_adap->dev, "s6i2c: cant get IRQ %d\n", iface->irq);
322 goto err_clk_dis;
323 }
324
325 i2c_wr16(iface, S6_I2C_ENABLE, 0);
326 udelay(1);
327 i2c_wr32(iface, S6_I2C_SRESET, 1 << S6_I2C_SRESET_IC_SRST);
328 i2c_wr16(iface, S6_I2C_CLRTXABRT, 1);
329 i2c_wr16(iface, S6_I2C_CON,
330 (1 << S6_I2C_CON_MASTER) |
331 (S6_I2C_CON_SPEED_NORMAL << S6_I2C_CON_SPEED) |
332 (0 << S6_I2C_CON_10BITSLAVE) |
333 (0 << S6_I2C_CON_10BITMASTER) |
334 (1 << S6_I2C_CON_RESTARTENA) |
335 (1 << S6_I2C_CON_SLAVEDISABLE));
336 i2c_wr16(iface, S6_I2C_SSHCNT, nanoseconds_on_clk(iface, 4000));
337 i2c_wr16(iface, S6_I2C_SSLCNT, nanoseconds_on_clk(iface, 4700));
338 i2c_wr16(iface, S6_I2C_FSHCNT, nanoseconds_on_clk(iface, 600));
339 i2c_wr16(iface, S6_I2C_FSLCNT, nanoseconds_on_clk(iface, 1300));
340 i2c_wr16(iface, S6_I2C_RXTL, 0);
341 i2c_wr16(iface, S6_I2C_TXTL, 0);
342
343 platform_set_drvdata(dev, iface);
344 if (bus_num < 0)
345 rc = i2c_add_adapter(p_adap);
346 else
347 rc = i2c_add_numbered_adapter(p_adap);
348 if (rc)
349 goto err_irq_free;
350 return 0;
351
352err_irq_free:
353 free_irq(iface->irq, iface);
354err_clk_dis:
355 clk_disable(iface->clk);
356err_clk_put:
357 clk_put(iface->clk);
358err_map:
359 iounmap(iface->reg);
360err_reg:
361 release_mem_region(iface->res->start,
362 resource_size(iface->res));
363err_out:
364 return rc;
365}
366
367static int __devexit s6i2c_remove(struct platform_device *pdev)
368{
369 struct s6i2c_if *iface = platform_get_drvdata(pdev);
370 i2c_wr16(iface, S6_I2C_ENABLE, 0);
371 platform_set_drvdata(pdev, NULL);
372 i2c_del_adapter(&iface->adap);
373 free_irq(iface->irq, iface);
374 clk_disable(iface->clk);
375 clk_put(iface->clk);
376 iounmap(iface->reg);
377 release_mem_region(iface->res->start,
378 resource_size(iface->res));
379 return 0;
380}
381
382static struct platform_driver s6i2c_driver = {
383 .probe = s6i2c_probe,
384 .remove = __devexit_p(s6i2c_remove),
385 .driver = {
386 .name = DRV_NAME,
387 .owner = THIS_MODULE,
388 },
389};
390
391static int __init s6i2c_init(void)
392{
393 pr_info("I2C: S6000 I2C driver\n");
394 return platform_driver_register(&s6i2c_driver);
395}
396
397static void __exit s6i2c_exit(void)
398{
399 platform_driver_unregister(&s6i2c_driver);
400}
401
402MODULE_DESCRIPTION("I2C-Bus adapter routines for S6000 I2C");
403MODULE_LICENSE("GPL");
404MODULE_ALIAS("platform:" DRV_NAME);
405
406subsys_initcall(s6i2c_init);
407module_exit(s6i2c_exit);
diff --git a/drivers/i2c/busses/i2c-s6000.h b/drivers/i2c/busses/i2c-s6000.h
new file mode 100644
index 000000000000..ff23b81ded44
--- /dev/null
+++ b/drivers/i2c/busses/i2c-s6000.h
@@ -0,0 +1,79 @@
1/*
2 * drivers/i2c/busses/i2c-s6000.h
3 *
4 * This file is subject to the terms and conditions of the GNU General Public
5 * License. See the file "COPYING" in the main directory of this archive
6 * for more details.
7 *
8 * Copyright (C) 2008 Emlix GmbH <info@emlix.com>
9 * Author: Oskar Schirmer <os@emlix.com>
10 */
11
12#ifndef __DRIVERS_I2C_BUSSES_I2C_S6000_H
13#define __DRIVERS_I2C_BUSSES_I2C_S6000_H
14
15#define S6_I2C_CON 0x000
16#define S6_I2C_CON_MASTER 0
17#define S6_I2C_CON_SPEED 1
18#define S6_I2C_CON_SPEED_NORMAL 1
19#define S6_I2C_CON_SPEED_FAST 2
20#define S6_I2C_CON_SPEED_MASK 3
21#define S6_I2C_CON_10BITSLAVE 3
22#define S6_I2C_CON_10BITMASTER 4
23#define S6_I2C_CON_RESTARTENA 5
24#define S6_I2C_CON_SLAVEDISABLE 6
25#define S6_I2C_TAR 0x004
26#define S6_I2C_TAR_GCORSTART 10
27#define S6_I2C_TAR_SPECIAL 11
28#define S6_I2C_SAR 0x008
29#define S6_I2C_HSMADDR 0x00C
30#define S6_I2C_DATACMD 0x010
31#define S6_I2C_DATACMD_READ 8
32#define S6_I2C_SSHCNT 0x014
33#define S6_I2C_SSLCNT 0x018
34#define S6_I2C_FSHCNT 0x01C
35#define S6_I2C_FSLCNT 0x020
36#define S6_I2C_INTRSTAT 0x02C
37#define S6_I2C_INTRMASK 0x030
38#define S6_I2C_RAWINTR 0x034
39#define S6_I2C_INTR_RXUNDER 0
40#define S6_I2C_INTR_RXOVER 1
41#define S6_I2C_INTR_RXFULL 2
42#define S6_I2C_INTR_TXOVER 3
43#define S6_I2C_INTR_TXEMPTY 4
44#define S6_I2C_INTR_RDREQ 5
45#define S6_I2C_INTR_TXABRT 6
46#define S6_I2C_INTR_RXDONE 7
47#define S6_I2C_INTR_ACTIVITY 8
48#define S6_I2C_INTR_STOPDET 9
49#define S6_I2C_INTR_STARTDET 10
50#define S6_I2C_INTR_GENCALL 11
51#define S6_I2C_RXTL 0x038
52#define S6_I2C_TXTL 0x03C
53#define S6_I2C_CLRINTR 0x040
54#define S6_I2C_CLRRXUNDER 0x044
55#define S6_I2C_CLRRXOVER 0x048
56#define S6_I2C_CLRTXOVER 0x04C
57#define S6_I2C_CLRRDREQ 0x050
58#define S6_I2C_CLRTXABRT 0x054
59#define S6_I2C_CLRRXDONE 0x058
60#define S6_I2C_CLRACTIVITY 0x05C
61#define S6_I2C_CLRSTOPDET 0x060
62#define S6_I2C_CLRSTARTDET 0x064
63#define S6_I2C_CLRGENCALL 0x068
64#define S6_I2C_ENABLE 0x06C
65#define S6_I2C_STATUS 0x070
66#define S6_I2C_STATUS_ACTIVITY 0
67#define S6_I2C_STATUS_TFNF 1
68#define S6_I2C_STATUS_TFE 2
69#define S6_I2C_STATUS_RFNE 3
70#define S6_I2C_STATUS_RFF 4
71#define S6_I2C_TXFLR 0x074
72#define S6_I2C_RXFLR 0x078
73#define S6_I2C_SRESET 0x07C
74#define S6_I2C_SRESET_IC_SRST 0
75#define S6_I2C_SRESET_IC_MASTER_SRST 1
76#define S6_I2C_SRESET_IC_SLAVE_SRST 2
77#define S6_I2C_TXABRTSOURCE 0x080
78
79#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-22 16:11:19 -0500