blob: 370c342e5e811404b2aa33a0d4084160898a5432 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * (C) Copyright 2003-2004
3 * Humboldt Solutions Ltd, adrian@humboldt.co.uk.
4
5 * This is a combined i2c adapter and algorithm driver for the
6 * MPC107/Tsi107 PowerPC northbridge and processors that include
7 * the same I2C unit (8240, 8245, 85xx).
8 *
9 * Release 0.8
10 *
11 * This file is licensed under the terms of the GNU General Public
12 * License version 2. This program is licensed "as is" without any
13 * warranty of any kind, whether express or implied.
14 */
15
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/sched.h>
19#include <linux/init.h>
Jon Smirl0d1cde22008-06-30 19:01:26 -040020#include <linux/of_platform.h>
21#include <linux/of_i2c.h>
Russell Kingd052d1b2005-10-29 19:07:23 +010022
Wolfgang Grandegger8101a302009-04-07 10:20:53 +020023#include <linux/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/fsl_devices.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/i2c.h>
26#include <linux/interrupt.h>
27#include <linux/delay.h>
28
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +020029#include <asm/mpc52xx.h>
30#include <sysdev/fsl_soc.h>
31
Jon Smirl0d1cde22008-06-30 19:01:26 -040032#define DRV_NAME "mpc-i2c"
33
Wolfgang Grandegger8101a302009-04-07 10:20:53 +020034#define MPC_I2C_FDR 0x04
35#define MPC_I2C_CR 0x08
36#define MPC_I2C_SR 0x0c
37#define MPC_I2C_DR 0x10
Linus Torvalds1da177e2005-04-16 15:20:36 -070038#define MPC_I2C_DFSRR 0x14
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#define CCR_MEN 0x80
41#define CCR_MIEN 0x40
42#define CCR_MSTA 0x20
43#define CCR_MTX 0x10
44#define CCR_TXAK 0x08
45#define CCR_RSTA 0x04
46
47#define CSR_MCF 0x80
48#define CSR_MAAS 0x40
49#define CSR_MBB 0x20
50#define CSR_MAL 0x10
51#define CSR_SRW 0x04
52#define CSR_MIF 0x02
53#define CSR_RXAK 0x01
54
55struct mpc_i2c {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +020056 struct device *dev;
Al Viro7366d362005-04-25 18:32:12 -070057 void __iomem *base;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 u32 interrupt;
59 wait_queue_head_t queue;
60 struct i2c_adapter adap;
61 int irq;
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +020062};
63
64struct mpc_i2c_divider {
65 u16 divider;
66 u16 fdr; /* including dfsrr */
67};
68
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +010069struct mpc_i2c_data {
Wolfgang Grandeggera9352212010-02-17 11:19:18 +010070 void (*setup)(struct device_node *node, struct mpc_i2c *i2c,
71 u32 clock, u32 prescaler);
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +020072 u32 prescaler;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073};
74
Wolfgang Grandegger8101a302009-04-07 10:20:53 +020075static inline void writeccr(struct mpc_i2c *i2c, u32 x)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
77 writeb(x, i2c->base + MPC_I2C_CR);
78}
79
David Howells7d12e782006-10-05 14:55:46 +010080static irqreturn_t mpc_i2c_isr(int irq, void *dev_id)
Linus Torvalds1da177e2005-04-16 15:20:36 -070081{
82 struct mpc_i2c *i2c = dev_id;
83 if (readb(i2c->base + MPC_I2C_SR) & CSR_MIF) {
84 /* Read again to allow register to stabilise */
85 i2c->interrupt = readb(i2c->base + MPC_I2C_SR);
86 writeb(0, i2c->base + MPC_I2C_SR);
Timur Tabi1ab082d2009-02-06 08:00:37 -060087 wake_up(&i2c->queue);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 }
89 return IRQ_HANDLED;
90}
91
Domen Puncer254db9b2007-07-12 14:12:31 +020092/* Sometimes 9th clock pulse isn't generated, and slave doesn't release
93 * the bus, because it wants to send ACK.
94 * Following sequence of enabling/disabling and sending start/stop generates
95 * the pulse, so it's all OK.
96 */
97static void mpc_i2c_fixup(struct mpc_i2c *i2c)
98{
99 writeccr(i2c, 0);
100 udelay(30);
101 writeccr(i2c, CCR_MEN);
102 udelay(30);
103 writeccr(i2c, CCR_MSTA | CCR_MTX);
104 udelay(30);
105 writeccr(i2c, CCR_MSTA | CCR_MTX | CCR_MEN);
106 udelay(30);
107 writeccr(i2c, CCR_MEN);
108 udelay(30);
109}
110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
112{
113 unsigned long orig_jiffies = jiffies;
114 u32 x;
115 int result = 0;
116
Wolfgang Grandegger8101a302009-04-07 10:20:53 +0200117 if (i2c->irq == NO_IRQ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 while (!(readb(i2c->base + MPC_I2C_SR) & CSR_MIF)) {
119 schedule();
120 if (time_after(jiffies, orig_jiffies + timeout)) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200121 dev_dbg(i2c->dev, "timeout\n");
Domen Puncer5af0e072007-08-14 18:37:14 +0200122 writeccr(i2c, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 result = -EIO;
124 break;
125 }
126 }
127 x = readb(i2c->base + MPC_I2C_SR);
128 writeb(0, i2c->base + MPC_I2C_SR);
129 } else {
130 /* Interrupt mode */
Timur Tabi1ab082d2009-02-06 08:00:37 -0600131 result = wait_event_timeout(i2c->queue,
Jean Delvare8a52c6b2009-03-28 21:34:43 +0100132 (i2c->interrupt & CSR_MIF), timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133
Timur Tabi1ab082d2009-02-06 08:00:37 -0600134 if (unlikely(!(i2c->interrupt & CSR_MIF))) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200135 dev_dbg(i2c->dev, "wait timeout\n");
Domen Puncer5af0e072007-08-14 18:37:14 +0200136 writeccr(i2c, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 result = -ETIMEDOUT;
138 }
139
140 x = i2c->interrupt;
141 i2c->interrupt = 0;
142 }
143
144 if (result < 0)
145 return result;
146
147 if (!(x & CSR_MCF)) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200148 dev_dbg(i2c->dev, "unfinished\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 return -EIO;
150 }
151
152 if (x & CSR_MAL) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200153 dev_dbg(i2c->dev, "MAL\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 return -EIO;
155 }
156
157 if (writing && (x & CSR_RXAK)) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200158 dev_dbg(i2c->dev, "No RXAK\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 /* generate stop */
160 writeccr(i2c, CCR_MEN);
161 return -EIO;
162 }
163 return 0;
164}
165
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200166#ifdef CONFIG_PPC_MPC52xx
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100167static const struct mpc_i2c_divider mpc_i2c_dividers_52xx[] __devinitconst = {
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200168 {20, 0x20}, {22, 0x21}, {24, 0x22}, {26, 0x23},
169 {28, 0x24}, {30, 0x01}, {32, 0x25}, {34, 0x02},
170 {36, 0x26}, {40, 0x27}, {44, 0x04}, {48, 0x28},
171 {52, 0x63}, {56, 0x29}, {60, 0x41}, {64, 0x2a},
172 {68, 0x07}, {72, 0x2b}, {80, 0x2c}, {88, 0x09},
173 {96, 0x2d}, {104, 0x0a}, {112, 0x2e}, {120, 0x81},
174 {128, 0x2f}, {136, 0x47}, {144, 0x0c}, {160, 0x30},
175 {176, 0x49}, {192, 0x31}, {208, 0x4a}, {224, 0x32},
176 {240, 0x0f}, {256, 0x33}, {272, 0x87}, {288, 0x10},
177 {320, 0x34}, {352, 0x89}, {384, 0x35}, {416, 0x8a},
178 {448, 0x36}, {480, 0x13}, {512, 0x37}, {576, 0x14},
179 {640, 0x38}, {768, 0x39}, {896, 0x3a}, {960, 0x17},
180 {1024, 0x3b}, {1152, 0x18}, {1280, 0x3c}, {1536, 0x3d},
181 {1792, 0x3e}, {1920, 0x1b}, {2048, 0x3f}, {2304, 0x1c},
182 {2560, 0x1d}, {3072, 0x1e}, {3584, 0x7e}, {3840, 0x1f},
183 {4096, 0x7f}, {4608, 0x5c}, {5120, 0x5d}, {6144, 0x5e},
184 {7168, 0xbe}, {7680, 0x5f}, {8192, 0xbf}, {9216, 0x9c},
185 {10240, 0x9d}, {12288, 0x9e}, {15360, 0x9f}
186};
187
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100188static int __devinit mpc_i2c_get_fdr_52xx(struct device_node *node, u32 clock,
189 int prescaler)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200191 const struct mpc_i2c_divider *div = NULL;
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200192 unsigned int pvr = mfspr(SPRN_PVR);
193 u32 divider;
194 int i;
195
196 if (!clock)
197 return -EINVAL;
198
199 /* Determine divider value */
Wolfgang Denk87c441e2009-06-17 00:30:22 -0600200 divider = mpc5xxx_get_bus_frequency(node) / clock;
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200201
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 */
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200206 for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_52xx); i++) {
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200207 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;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216}
217
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100218static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
219 struct mpc_i2c *i2c,
220 u32 clock, u32 prescaler)
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200221{
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200222 int ret, fdr;
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200223
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200224 ret = mpc_i2c_get_fdr_52xx(node, clock, prescaler);
225 fdr = (ret >= 0) ? ret : 0x3f; /* backward compatibility */
226
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200227 writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200228
229 if (ret >= 0)
230 dev_info(i2c->dev, "clock %d Hz (fdr=%d)\n", clock, fdr);
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200231}
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200232#else /* !CONFIG_PPC_MPC52xx */
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100233static void __devinit mpc_i2c_setup_52xx(struct device_node *node,
234 struct mpc_i2c *i2c,
235 u32 clock, u32 prescaler)
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200236{
237}
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200238#endif /* CONFIG_PPC_MPC52xx*/
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200239
240#ifdef CONFIG_FSL_SOC
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100241static const struct mpc_i2c_divider mpc_i2c_dividers_8xxx[] __devinitconst = {
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200242 {160, 0x0120}, {192, 0x0121}, {224, 0x0122}, {256, 0x0123},
243 {288, 0x0100}, {320, 0x0101}, {352, 0x0601}, {384, 0x0102},
244 {416, 0x0602}, {448, 0x0126}, {480, 0x0103}, {512, 0x0127},
245 {544, 0x0b03}, {576, 0x0104}, {608, 0x1603}, {640, 0x0105},
246 {672, 0x2003}, {704, 0x0b05}, {736, 0x2b03}, {768, 0x0106},
247 {800, 0x3603}, {832, 0x0b06}, {896, 0x012a}, {960, 0x0107},
248 {1024, 0x012b}, {1088, 0x1607}, {1152, 0x0108}, {1216, 0x2b07},
249 {1280, 0x0109}, {1408, 0x1609}, {1536, 0x010a}, {1664, 0x160a},
250 {1792, 0x012e}, {1920, 0x010b}, {2048, 0x012f}, {2176, 0x2b0b},
251 {2304, 0x010c}, {2560, 0x010d}, {2816, 0x2b0d}, {3072, 0x010e},
252 {3328, 0x2b0e}, {3584, 0x0132}, {3840, 0x010f}, {4096, 0x0133},
253 {4608, 0x0110}, {5120, 0x0111}, {6144, 0x0112}, {7168, 0x0136},
254 {7680, 0x0113}, {8192, 0x0137}, {9216, 0x0114}, {10240, 0x0115},
255 {12288, 0x0116}, {14336, 0x013a}, {15360, 0x0117}, {16384, 0x013b},
256 {18432, 0x0118}, {20480, 0x0119}, {24576, 0x011a}, {28672, 0x013e},
257 {30720, 0x011b}, {32768, 0x013f}, {36864, 0x011c}, {40960, 0x011d},
258 {49152, 0x011e}, {61440, 0x011f}
259};
260
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100261static u32 __devinit mpc_i2c_get_sec_cfg_8xxx(void)
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200262{
263 struct device_node *node = NULL;
264 u32 __iomem *reg;
265 u32 val = 0;
266
267 node = of_find_node_by_name(NULL, "global-utilities");
268 if (node) {
269 const u32 *prop = of_get_property(node, "reg", NULL);
270 if (prop) {
271 /*
272 * Map and check POR Device Status Register 2
273 * (PORDEVSR2) at 0xE0014
274 */
275 reg = ioremap(get_immrbase() + *prop + 0x14, 0x4);
276 if (!reg)
277 printk(KERN_ERR
278 "Error: couldn't map PORDEVSR2\n");
279 else
280 val = in_be32(reg) & 0x00000080; /* sec-cfg */
281 iounmap(reg);
282 }
283 }
284 if (node)
285 of_node_put(node);
286
287 return val;
288}
289
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100290static int __devinit mpc_i2c_get_fdr_8xxx(struct device_node *node, u32 clock,
291 u32 prescaler)
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200292{
293 const struct mpc_i2c_divider *div = NULL;
294 u32 divider;
295 int i;
296
297 if (!clock)
298 return -EINVAL;
299
300 /* Determine proper divider value */
301 if (of_device_is_compatible(node, "fsl,mpc8544-i2c"))
302 prescaler = mpc_i2c_get_sec_cfg_8xxx() ? 3 : 2;
303 if (!prescaler)
304 prescaler = 1;
305
306 divider = fsl_get_sys_freq() / clock / prescaler;
307
308 pr_debug("I2C: src_clock=%d clock=%d divider=%d\n",
309 fsl_get_sys_freq(), clock, divider);
310
311 /*
312 * We want to choose an FDR/DFSR that generates an I2C bus speed that
313 * is equal to or lower than the requested speed.
314 */
315 for (i = 0; i < ARRAY_SIZE(mpc_i2c_dividers_8xxx); i++) {
316 div = &mpc_i2c_dividers_8xxx[i];
317 if (div->divider >= divider)
318 break;
319 }
320
321 return div ? (int)div->fdr : -EINVAL;
322}
323
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100324static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
325 struct mpc_i2c *i2c,
326 u32 clock, u32 prescaler)
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200327{
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200328 int ret, fdr;
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200329
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200330 ret = mpc_i2c_get_fdr_8xxx(node, clock, prescaler);
331 fdr = (ret >= 0) ? ret : 0x1031; /* backward compatibility */
332
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200333 writeb(fdr & 0xff, i2c->base + MPC_I2C_FDR);
334 writeb((fdr >> 8) & 0xff, i2c->base + MPC_I2C_DFSRR);
Wolfgang Grandegger1904b032009-04-09 11:59:52 +0200335
336 if (ret >= 0)
337 dev_info(i2c->dev, "clock %d Hz (dfsrr=%d fdr=%d)\n",
338 clock, fdr >> 8, fdr & 0xff);
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200339}
340
341#else /* !CONFIG_FSL_SOC */
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100342static void __devinit mpc_i2c_setup_8xxx(struct device_node *node,
343 struct mpc_i2c *i2c,
344 u32 clock, u32 prescaler)
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200345{
346}
347#endif /* CONFIG_FSL_SOC */
348
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349static void mpc_i2c_start(struct mpc_i2c *i2c)
350{
351 /* Clear arbitration */
352 writeb(0, i2c->base + MPC_I2C_SR);
353 /* Start with MEN */
354 writeccr(i2c, CCR_MEN);
355}
356
357static void mpc_i2c_stop(struct mpc_i2c *i2c)
358{
359 writeccr(i2c, CCR_MEN);
360}
361
362static int mpc_write(struct mpc_i2c *i2c, int target,
Wolfgang Grandegger8101a302009-04-07 10:20:53 +0200363 const u8 *data, int length, int restart)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
Jon Smirl4bd28eb2008-01-27 18:14:52 +0100365 int i, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 unsigned timeout = i2c->adap.timeout;
367 u32 flags = restart ? CCR_RSTA : 0;
368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 /* Start as master */
370 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);
371 /* Write target byte */
372 writeb((target << 1), i2c->base + MPC_I2C_DR);
373
Jon Smirl4bd28eb2008-01-27 18:14:52 +0100374 result = i2c_wait(i2c, timeout, 1);
375 if (result < 0)
376 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377
378 for (i = 0; i < length; i++) {
379 /* Write data byte */
380 writeb(data[i], i2c->base + MPC_I2C_DR);
381
Jon Smirl4bd28eb2008-01-27 18:14:52 +0100382 result = i2c_wait(i2c, timeout, 1);
383 if (result < 0)
384 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 }
386
387 return 0;
388}
389
390static int mpc_read(struct mpc_i2c *i2c, int target,
Wolfgang Grandegger8101a302009-04-07 10:20:53 +0200391 u8 *data, int length, int restart)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392{
393 unsigned timeout = i2c->adap.timeout;
Jon Smirl4bd28eb2008-01-27 18:14:52 +0100394 int i, result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 u32 flags = restart ? CCR_RSTA : 0;
396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 /* Switch to read - restart */
398 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);
399 /* Write target address byte - this time with the read flag set */
400 writeb((target << 1) | 1, i2c->base + MPC_I2C_DR);
401
Jon Smirl4bd28eb2008-01-27 18:14:52 +0100402 result = i2c_wait(i2c, timeout, 1);
403 if (result < 0)
404 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406 if (length) {
407 if (length == 1)
408 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);
409 else
410 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA);
411 /* Dummy read */
412 readb(i2c->base + MPC_I2C_DR);
413 }
414
415 for (i = 0; i < length; i++) {
Jon Smirl4bd28eb2008-01-27 18:14:52 +0100416 result = i2c_wait(i2c, timeout, 0);
417 if (result < 0)
418 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
420 /* Generate txack on next to last byte */
421 if (i == length - 2)
422 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);
Joakim Tjernlund45da7902009-10-13 10:12:03 +0200423 /* Do not generate stop on last byte */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 if (i == length - 1)
Joakim Tjernlund45da7902009-10-13 10:12:03 +0200425 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 data[i] = readb(i2c->base + MPC_I2C_DR);
427 }
428
429 return length;
430}
431
432static int mpc_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
433{
434 struct i2c_msg *pmsg;
435 int i;
436 int ret = 0;
437 unsigned long orig_jiffies = jiffies;
438 struct mpc_i2c *i2c = i2c_get_adapdata(adap);
439
440 mpc_i2c_start(i2c);
441
442 /* Allow bus up to 1s to become not busy */
443 while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {
444 if (signal_pending(current)) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200445 dev_dbg(i2c->dev, "Interrupted\n");
Domen Puncer5af0e072007-08-14 18:37:14 +0200446 writeccr(i2c, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 return -EINTR;
448 }
449 if (time_after(jiffies, orig_jiffies + HZ)) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200450 dev_dbg(i2c->dev, "timeout\n");
Domen Puncer254db9b2007-07-12 14:12:31 +0200451 if (readb(i2c->base + MPC_I2C_SR) ==
452 (CSR_MCF | CSR_MBB | CSR_RXAK))
453 mpc_i2c_fixup(i2c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 return -EIO;
455 }
456 schedule();
457 }
458
459 for (i = 0; ret >= 0 && i < num; i++) {
460 pmsg = &msgs[i];
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200461 dev_dbg(i2c->dev,
462 "Doing %s %d bytes to 0x%02x - %d of %d messages\n",
463 pmsg->flags & I2C_M_RD ? "read" : "write",
464 pmsg->len, pmsg->addr, i + 1, num);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 if (pmsg->flags & I2C_M_RD)
466 ret =
467 mpc_read(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
468 else
469 ret =
470 mpc_write(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
471 }
472 mpc_i2c_stop(i2c);
473 return (ret < 0) ? ret : num;
474}
475
476static u32 mpc_functionality(struct i2c_adapter *adap)
477{
478 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
479}
480
Jean Delvare8f9082c2006-09-03 22:39:46 +0200481static const struct i2c_algorithm mpc_algo = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 .master_xfer = mpc_xfer,
483 .functionality = mpc_functionality,
484};
485
486static struct i2c_adapter mpc_ops = {
487 .owner = THIS_MODULE,
488 .name = "MPC adapter",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 .algo = &mpc_algo,
Jean Delvare8a52c6b2009-03-28 21:34:43 +0100490 .timeout = HZ,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491};
492
Wolfgang Grandegger8101a302009-04-07 10:20:53 +0200493static int __devinit fsl_i2c_probe(struct of_device *op,
494 const struct of_device_id *match)
Kumar Gala8c86cb12005-07-27 11:43:26 -0700495{
Kumar Gala8c86cb12005-07-27 11:43:26 -0700496 struct mpc_i2c *i2c;
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200497 const u32 *prop;
498 u32 clock = 0;
499 int result = 0;
500 int plen;
Kumar Gala8c86cb12005-07-27 11:43:26 -0700501
Jon Smirl4bd28eb2008-01-27 18:14:52 +0100502 i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
503 if (!i2c)
Kumar Gala8c86cb12005-07-27 11:43:26 -0700504 return -ENOMEM;
Kumar Gala8c86cb12005-07-27 11:43:26 -0700505
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200506 i2c->dev = &op->dev; /* for debug and error output */
507
Kumar Gala8c86cb12005-07-27 11:43:26 -0700508 init_waitqueue_head(&i2c->queue);
509
Jon Smirl0d1cde22008-06-30 19:01:26 -0400510 i2c->base = of_iomap(op->node, 0);
Kumar Gala8c86cb12005-07-27 11:43:26 -0700511 if (!i2c->base) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200512 dev_err(i2c->dev, "failed to map controller\n");
Kumar Gala8c86cb12005-07-27 11:43:26 -0700513 result = -ENOMEM;
514 goto fail_map;
515 }
516
Jon Smirl0d1cde22008-06-30 19:01:26 -0400517 i2c->irq = irq_of_parse_and_map(op->node, 0);
518 if (i2c->irq != NO_IRQ) { /* i2c->irq = NO_IRQ implies polling */
519 result = request_irq(i2c->irq, mpc_i2c_isr,
520 IRQF_SHARED, "i2c-mpc", i2c);
521 if (result < 0) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200522 dev_err(i2c->dev, "failed to attach interrupt\n");
Jon Smirl0d1cde22008-06-30 19:01:26 -0400523 goto fail_request;
Kumar Gala8c86cb12005-07-27 11:43:26 -0700524 }
Jon Smirl0d1cde22008-06-30 19:01:26 -0400525 }
Wolfgang Grandegger8101a302009-04-07 10:20:53 +0200526
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200527 if (!of_get_property(op->node, "fsl,preserve-clocking", NULL)) {
528 prop = of_get_property(op->node, "clock-frequency", &plen);
529 if (prop && plen == sizeof(u32))
530 clock = *prop;
531
532 if (match->data) {
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100533 struct mpc_i2c_data *data =
534 (struct mpc_i2c_data *)match->data;
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100535 data->setup(op->node, i2c, clock, data->prescaler);
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200536 } else {
537 /* Backwards compatibility */
538 if (of_get_property(op->node, "dfsrr", NULL))
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100539 mpc_i2c_setup_8xxx(op->node, i2c, clock, 0);
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200540 }
541 }
Jon Smirl0d1cde22008-06-30 19:01:26 -0400542
543 dev_set_drvdata(&op->dev, i2c);
Kumar Gala8c86cb12005-07-27 11:43:26 -0700544
545 i2c->adap = mpc_ops;
546 i2c_set_adapdata(&i2c->adap, i2c);
Jon Smirl0d1cde22008-06-30 19:01:26 -0400547 i2c->adap.dev.parent = &op->dev;
548
549 result = i2c_add_adapter(&i2c->adap);
550 if (result < 0) {
Wolfgang Grandegger54377cd2009-04-07 10:20:54 +0200551 dev_err(i2c->dev, "failed to add adapter\n");
Kumar Gala8c86cb12005-07-27 11:43:26 -0700552 goto fail_add;
553 }
Jon Smirl0d1cde22008-06-30 19:01:26 -0400554 of_register_i2c_devices(&i2c->adap, op->node);
Kumar Gala8c86cb12005-07-27 11:43:26 -0700555
556 return result;
557
Jon Smirl0d1cde22008-06-30 19:01:26 -0400558 fail_add:
559 dev_set_drvdata(&op->dev, NULL);
560 free_irq(i2c->irq, i2c);
561 fail_request:
562 irq_dispose_mapping(i2c->irq);
Wolfgang Grandegger8101a302009-04-07 10:20:53 +0200563 iounmap(i2c->base);
Jon Smirl0d1cde22008-06-30 19:01:26 -0400564 fail_map:
Kumar Gala8c86cb12005-07-27 11:43:26 -0700565 kfree(i2c);
566 return result;
567};
568
Jon Smirl0d1cde22008-06-30 19:01:26 -0400569static int __devexit fsl_i2c_remove(struct of_device *op)
Kumar Gala8c86cb12005-07-27 11:43:26 -0700570{
Jon Smirl0d1cde22008-06-30 19:01:26 -0400571 struct mpc_i2c *i2c = dev_get_drvdata(&op->dev);
Kumar Gala8c86cb12005-07-27 11:43:26 -0700572
573 i2c_del_adapter(&i2c->adap);
Jon Smirl0d1cde22008-06-30 19:01:26 -0400574 dev_set_drvdata(&op->dev, NULL);
Kumar Gala8c86cb12005-07-27 11:43:26 -0700575
Jon Smirlf5fff362008-05-11 20:37:04 +0200576 if (i2c->irq != NO_IRQ)
Kumar Gala8c86cb12005-07-27 11:43:26 -0700577 free_irq(i2c->irq, i2c);
578
Jon Smirl0d1cde22008-06-30 19:01:26 -0400579 irq_dispose_mapping(i2c->irq);
Kumar Gala8c86cb12005-07-27 11:43:26 -0700580 iounmap(i2c->base);
581 kfree(i2c);
582 return 0;
583};
584
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100585static struct mpc_i2c_data mpc_i2c_data_52xx __devinitdata = {
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100586 .setup = mpc_i2c_setup_52xx,
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100587};
588
589static struct mpc_i2c_data mpc_i2c_data_8313 __devinitdata = {
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100590 .setup = mpc_i2c_setup_8xxx,
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100591};
592
593static struct mpc_i2c_data mpc_i2c_data_8543 __devinitdata = {
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100594 .setup = mpc_i2c_setup_8xxx,
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100595 .prescaler = 2,
596};
597
598static struct mpc_i2c_data mpc_i2c_data_8544 __devinitdata = {
Wolfgang Grandeggera9352212010-02-17 11:19:18 +0100599 .setup = mpc_i2c_setup_8xxx,
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100600 .prescaler = 3,
601};
602
Jon Smirl0d1cde22008-06-30 19:01:26 -0400603static const struct of_device_id mpc_i2c_of_match[] = {
Wolfgang Grandegger6e56dd32010-02-17 11:19:17 +0100604 {.compatible = "mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
605 {.compatible = "fsl,mpc5200b-i2c", .data = &mpc_i2c_data_52xx, },
606 {.compatible = "fsl,mpc5200-i2c", .data = &mpc_i2c_data_52xx, },
607 {.compatible = "fsl,mpc8313-i2c", .data = &mpc_i2c_data_8313, },
608 {.compatible = "fsl,mpc8543-i2c", .data = &mpc_i2c_data_8543, },
609 {.compatible = "fsl,mpc8544-i2c", .data = &mpc_i2c_data_8544, },
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200610 /* Backward compatibility */
Wolfgang Grandeggerf2bd5ef2009-04-07 10:20:55 +0200611 {.compatible = "fsl-i2c", },
Jon Smirl0d1cde22008-06-30 19:01:26 -0400612 {},
613};
614MODULE_DEVICE_TABLE(of, mpc_i2c_of_match);
615
Kay Sieversadd8eda2008-04-22 22:16:49 +0200616
Kumar Gala8c86cb12005-07-27 11:43:26 -0700617/* Structure for a device driver */
Jon Smirl0d1cde22008-06-30 19:01:26 -0400618static struct of_platform_driver mpc_i2c_driver = {
619 .match_table = mpc_i2c_of_match,
620 .probe = fsl_i2c_probe,
621 .remove = __devexit_p(fsl_i2c_remove),
622 .driver = {
623 .owner = THIS_MODULE,
624 .name = DRV_NAME,
Russell King3ae5eae2005-11-09 22:32:44 +0000625 },
Kumar Gala8c86cb12005-07-27 11:43:26 -0700626};
627
628static int __init fsl_i2c_init(void)
629{
Jon Smirl0d1cde22008-06-30 19:01:26 -0400630 int rv;
631
632 rv = of_register_platform_driver(&mpc_i2c_driver);
633 if (rv)
Wolfgang Grandegger8101a302009-04-07 10:20:53 +0200634 printk(KERN_ERR DRV_NAME
Jon Smirl0d1cde22008-06-30 19:01:26 -0400635 " of_register_platform_driver failed (%i)\n", rv);
636 return rv;
Kumar Gala8c86cb12005-07-27 11:43:26 -0700637}
638
639static void __exit fsl_i2c_exit(void)
640{
Jon Smirl0d1cde22008-06-30 19:01:26 -0400641 of_unregister_platform_driver(&mpc_i2c_driver);
Kumar Gala8c86cb12005-07-27 11:43:26 -0700642}
643
644module_init(fsl_i2c_init);
645module_exit(fsl_i2c_exit);
646
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
Wolfgang Grandegger8101a302009-04-07 10:20:53 +0200648MODULE_DESCRIPTION("I2C-Bus adapter for MPC107 bridge and "
649 "MPC824x/85xx/52xx processors");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650MODULE_LICENSE("GPL");