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16#include <linux/config.h>
17#include <linux/kernel.h>
18#include <linux/module.h>
19#include <linux/sched.h>
20#include <linux/init.h>
21#include <linux/pci.h>
22#include <asm/io.h>
23#ifdef CONFIG_FSL_OCP
24#include <asm/ocp.h>
25#define FSL_I2C_DEV_SEPARATE_DFSRR FS_I2C_SEPARATE_DFSRR
26#define FSL_I2C_DEV_CLOCK_5200 FS_I2C_CLOCK_5200
27#else
28#include <linux/fsl_devices.h>
29#endif
30#include <linux/i2c.h>
31#include <linux/interrupt.h>
32#include <linux/delay.h>
33
34#define MPC_I2C_ADDR 0x00
35#define MPC_I2C_FDR 0x04
36#define MPC_I2C_CR 0x08
37#define MPC_I2C_SR 0x0c
38#define MPC_I2C_DR 0x10
39#define MPC_I2C_DFSRR 0x14
40#define MPC_I2C_REGION 0x20
41
42#define CCR_MEN 0x80
43#define CCR_MIEN 0x40
44#define CCR_MSTA 0x20
45#define CCR_MTX 0x10
46#define CCR_TXAK 0x08
47#define CCR_RSTA 0x04
48
49#define CSR_MCF 0x80
50#define CSR_MAAS 0x40
51#define CSR_MBB 0x20
52#define CSR_MAL 0x10
53#define CSR_SRW 0x04
54#define CSR_MIF 0x02
55#define CSR_RXAK 0x01
56
57struct mpc_i2c {
58 char *base;
59 u32 interrupt;
60 wait_queue_head_t queue;
61 struct i2c_adapter adap;
62 int irq;
63 u32 flags;
64};
65
66static __inline__ void writeccr(struct mpc_i2c *i2c, u32 x)
67{
68 writeb(x, i2c->base + MPC_I2C_CR);
69}
70
71static irqreturn_t mpc_i2c_isr(int irq, void *dev_id, struct pt_regs *regs)
72{
73 struct mpc_i2c *i2c = dev_id;
74 if (readb(i2c->base + MPC_I2C_SR) & CSR_MIF) {
75
76 i2c->interrupt = readb(i2c->base + MPC_I2C_SR);
77 writeb(0, i2c->base + MPC_I2C_SR);
78 wake_up_interruptible(&i2c->queue);
79 }
80 return IRQ_HANDLED;
81}
82
83static int i2c_wait(struct mpc_i2c *i2c, unsigned timeout, int writing)
84{
85 unsigned long orig_jiffies = jiffies;
86 u32 x;
87 int result = 0;
88
89 if (i2c->irq == 0)
90 {
91 while (!(readb(i2c->base + MPC_I2C_SR) & CSR_MIF)) {
92 schedule();
93 if (time_after(jiffies, orig_jiffies + timeout)) {
94 pr_debug("I2C: timeout\n");
95 result = -EIO;
96 break;
97 }
98 }
99 x = readb(i2c->base + MPC_I2C_SR);
100 writeb(0, i2c->base + MPC_I2C_SR);
101 } else {
102
103 result = wait_event_interruptible_timeout(i2c->queue,
104 (i2c->interrupt & CSR_MIF), timeout * HZ);
105
106 if (unlikely(result < 0))
107 pr_debug("I2C: wait interrupted\n");
108 else if (unlikely(!(i2c->interrupt & CSR_MIF))) {
109 pr_debug("I2C: wait timeout\n");
110 result = -ETIMEDOUT;
111 }
112
113 x = i2c->interrupt;
114 i2c->interrupt = 0;
115 }
116
117 if (result < 0)
118 return result;
119
120 if (!(x & CSR_MCF)) {
121 pr_debug("I2C: unfinished\n");
122 return -EIO;
123 }
124
125 if (x & CSR_MAL) {
126 pr_debug("I2C: MAL\n");
127 return -EIO;
128 }
129
130 if (writing && (x & CSR_RXAK)) {
131 pr_debug("I2C: No RXAK\n");
132
133 writeccr(i2c, CCR_MEN);
134 return -EIO;
135 }
136 return 0;
137}
138
139static void mpc_i2c_setclock(struct mpc_i2c *i2c)
140{
141
142 if (i2c->flags & FSL_I2C_DEV_SEPARATE_DFSRR) {
143 writeb(0x31, i2c->base + MPC_I2C_FDR);
144 writeb(0x10, i2c->base + MPC_I2C_DFSRR);
145 } else if (i2c->flags & FSL_I2C_DEV_CLOCK_5200)
146 writeb(0x3f, i2c->base + MPC_I2C_FDR);
147 else
148 writel(0x1031, i2c->base + MPC_I2C_FDR);
149}
150
151static void mpc_i2c_start(struct mpc_i2c *i2c)
152{
153
154 writeb(0, i2c->base + MPC_I2C_SR);
155
156 writeccr(i2c, CCR_MEN);
157}
158
159static void mpc_i2c_stop(struct mpc_i2c *i2c)
160{
161 writeccr(i2c, CCR_MEN);
162}
163
164static int mpc_write(struct mpc_i2c *i2c, int target,
165 const u8 * data, int length, int restart)
166{
167 int i;
168 unsigned timeout = i2c->adap.timeout;
169 u32 flags = restart ? CCR_RSTA : 0;
170
171
172 if (!restart)
173 writeccr(i2c, CCR_MEN);
174
175 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);
176
177 writeb((target << 1), i2c->base + MPC_I2C_DR);
178
179 if (i2c_wait(i2c, timeout, 1) < 0)
180 return -1;
181
182 for (i = 0; i < length; i++) {
183
184 writeb(data[i], i2c->base + MPC_I2C_DR);
185
186 if (i2c_wait(i2c, timeout, 1) < 0)
187 return -1;
188 }
189
190 return 0;
191}
192
193static int mpc_read(struct mpc_i2c *i2c, int target,
194 u8 * data, int length, int restart)
195{
196 unsigned timeout = i2c->adap.timeout;
197 int i;
198 u32 flags = restart ? CCR_RSTA : 0;
199
200
201 if (!restart)
202 writeccr(i2c, CCR_MEN);
203
204 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_MTX | flags);
205
206 writeb((target << 1) | 1, i2c->base + MPC_I2C_DR);
207
208 if (i2c_wait(i2c, timeout, 1) < 0)
209 return -1;
210
211 if (length) {
212 if (length == 1)
213 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);
214 else
215 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA);
216
217 readb(i2c->base + MPC_I2C_DR);
218 }
219
220 for (i = 0; i < length; i++) {
221 if (i2c_wait(i2c, timeout, 0) < 0)
222 return -1;
223
224
225 if (i == length - 2)
226 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_MSTA | CCR_TXAK);
227
228 if (i == length - 1)
229 writeccr(i2c, CCR_MIEN | CCR_MEN | CCR_TXAK);
230 data[i] = readb(i2c->base + MPC_I2C_DR);
231 }
232
233 return length;
234}
235
236static int mpc_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num)
237{
238 struct i2c_msg *pmsg;
239 int i;
240 int ret = 0;
241 unsigned long orig_jiffies = jiffies;
242 struct mpc_i2c *i2c = i2c_get_adapdata(adap);
243
244 mpc_i2c_start(i2c);
245
246
247 while (readb(i2c->base + MPC_I2C_SR) & CSR_MBB) {
248 if (signal_pending(current)) {
249 pr_debug("I2C: Interrupted\n");
250 return -EINTR;
251 }
252 if (time_after(jiffies, orig_jiffies + HZ)) {
253 pr_debug("I2C: timeout\n");
254 return -EIO;
255 }
256 schedule();
257 }
258
259 for (i = 0; ret >= 0 && i < num; i++) {
260 pmsg = &msgs[i];
261 pr_debug("Doing %s %d bytes to 0x%02x - %d of %d messages\n",
262 pmsg->flags & I2C_M_RD ? "read" : "write",
263 pmsg->len, pmsg->addr, i + 1, num);
264 if (pmsg->flags & I2C_M_RD)
265 ret =
266 mpc_read(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
267 else
268 ret =
269 mpc_write(i2c, pmsg->addr, pmsg->buf, pmsg->len, i);
270 }
271 mpc_i2c_stop(i2c);
272 return (ret < 0) ? ret : num;
273}
274
275static u32 mpc_functionality(struct i2c_adapter *adap)
276{
277 return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
278}
279
280static struct i2c_algorithm mpc_algo = {
281 .name = "MPC algorithm",
282 .id = I2C_ALGO_MPC107,
283 .master_xfer = mpc_xfer,
284 .functionality = mpc_functionality,
285};
286
287static struct i2c_adapter mpc_ops = {
288 .owner = THIS_MODULE,
289 .name = "MPC adapter",
290 .id = I2C_ALGO_MPC107 | I2C_HW_MPC107,
291 .algo = &mpc_algo,
292 .class = I2C_CLASS_HWMON,
293 .timeout = 1,
294 .retries = 1
295};
296
297#ifdef CONFIG_FSL_OCP
298static int __devinit mpc_i2c_probe(struct ocp_device *ocp)
299{
300 int result = 0;
301 struct mpc_i2c *i2c;
302
303 if (!(i2c = kmalloc(sizeof(*i2c), GFP_KERNEL))) {
304 return -ENOMEM;
305 }
306 memset(i2c, 0, sizeof(*i2c));
307
308 i2c->irq = ocp->def->irq;
309 i2c->flags = ((struct ocp_fs_i2c_data *)ocp->def->additions)->flags;
310 init_waitqueue_head(&i2c->queue);
311
312 if (!request_mem_region(ocp->def->paddr, MPC_I2C_REGION, "i2c-mpc")) {
313 printk(KERN_ERR "i2c-mpc - resource unavailable\n");
314 return -ENODEV;
315 }
316
317 i2c->base = ioremap(ocp->def->paddr, MPC_I2C_REGION);
318
319 if (!i2c->base) {
320 printk(KERN_ERR "i2c-mpc - failed to map controller\n");
321 result = -ENOMEM;
322 goto fail_map;
323 }
324
325 if (i2c->irq != OCP_IRQ_NA)
326 {
327 if ((result = request_irq(ocp->def->irq, mpc_i2c_isr,
328 0, "i2c-mpc", i2c)) < 0) {
329 printk(KERN_ERR
330 "i2c-mpc - failed to attach interrupt\n");
331 goto fail_irq;
332 }
333 } else
334 i2c->irq = 0;
335
336 i2c->adap = mpc_ops;
337 i2c_set_adapdata(&i2c->adap, i2c);
338
339 if ((result = i2c_add_adapter(&i2c->adap)) < 0) {
340 printk(KERN_ERR "i2c-mpc - failed to add adapter\n");
341 goto fail_add;
342 }
343
344 mpc_i2c_setclock(i2c);
345 ocp_set_drvdata(ocp, i2c);
346 return result;
347
348 fail_add:
349 if (ocp->def->irq != OCP_IRQ_NA)
350 free_irq(ocp->def->irq, 0);
351 fail_irq:
352 iounmap(i2c->base);
353 fail_map:
354 release_mem_region(ocp->def->paddr, MPC_I2C_REGION);
355 kfree(i2c);
356 return result;
357}
358static void __devexit mpc_i2c_remove(struct ocp_device *ocp)
359{
360 struct mpc_i2c *i2c = ocp_get_drvdata(ocp);
361 ocp_set_drvdata(ocp, NULL);
362 i2c_del_adapter(&i2c->adap);
363
364 if (ocp->def->irq != OCP_IRQ_NA)
365 free_irq(i2c->irq, i2c);
366 iounmap(i2c->base);
367 release_mem_region(ocp->def->paddr, MPC_I2C_REGION);
368 kfree(i2c);
369}
370
371static struct ocp_device_id mpc_iic_ids[] __devinitdata = {
372 {.vendor = OCP_VENDOR_FREESCALE,.function = OCP_FUNC_IIC},
373 {.vendor = OCP_VENDOR_INVALID}
374};
375
376MODULE_DEVICE_TABLE(ocp, mpc_iic_ids);
377
378static struct ocp_driver mpc_iic_driver = {
379 .name = "iic",
380 .id_table = mpc_iic_ids,
381 .probe = mpc_i2c_probe,
382 .remove = __devexit_p(mpc_i2c_remove)
383};
384
385static int __init iic_init(void)
386{
387 return ocp_register_driver(&mpc_iic_driver);
388}
389
390static void __exit iic_exit(void)
391{
392 ocp_unregister_driver(&mpc_iic_driver);
393}
394
395module_init(iic_init);
396module_exit(iic_exit);
397#else
398static int fsl_i2c_probe(struct device *device)
399{
400 int result = 0;
401 struct mpc_i2c *i2c;
402 struct platform_device *pdev = to_platform_device(device);
403 struct fsl_i2c_platform_data *pdata;
404 struct resource *r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
405
406 pdata = (struct fsl_i2c_platform_data *) pdev->dev.platform_data;
407
408 if (!(i2c = kmalloc(sizeof(*i2c), GFP_KERNEL))) {
409 return -ENOMEM;
410 }
411 memset(i2c, 0, sizeof(*i2c));
412
413 i2c->irq = platform_get_irq(pdev, 0);
414 i2c->flags = pdata->device_flags;
415 init_waitqueue_head(&i2c->queue);
416
417 i2c->base = ioremap((phys_addr_t)r->start, MPC_I2C_REGION);
418
419 if (!i2c->base) {
420 printk(KERN_ERR "i2c-mpc - failed to map controller\n");
421 result = -ENOMEM;
422 goto fail_map;
423 }
424
425 if (i2c->irq != 0)
426 if ((result = request_irq(i2c->irq, mpc_i2c_isr,
427 0, "fsl-i2c", i2c)) < 0) {
428 printk(KERN_ERR
429 "i2c-mpc - failed to attach interrupt\n");
430 goto fail_irq;
431 }
432
433 i2c->adap = mpc_ops;
434 i2c_set_adapdata(&i2c->adap, i2c);
435 i2c->adap.dev.parent = &pdev->dev;
436 if ((result = i2c_add_adapter(&i2c->adap)) < 0) {
437 printk(KERN_ERR "i2c-mpc - failed to add adapter\n");
438 goto fail_add;
439 }
440
441 mpc_i2c_setclock(i2c);
442 dev_set_drvdata(device, i2c);
443 return result;
444
445 fail_add:
446 if (i2c->irq != 0)
447 free_irq(i2c->irq, 0);
448 fail_irq:
449 iounmap(i2c->base);
450 fail_map:
451 kfree(i2c);
452 return result;
453};
454
455static int fsl_i2c_remove(struct device *device)
456{
457 struct mpc_i2c *i2c = dev_get_drvdata(device);
458
459 dev_set_drvdata(device, NULL);
460 i2c_del_adapter(&i2c->adap);
461
462 if (i2c->irq != 0)
463 free_irq(i2c->irq, i2c);
464
465 iounmap(i2c->base);
466 kfree(i2c);
467 return 0;
468};
469
470
471static struct device_driver fsl_i2c_driver = {
472 .name = "fsl-i2c",
473 .bus = &platform_bus_type,
474 .probe = fsl_i2c_probe,
475 .remove = fsl_i2c_remove,
476};
477
478static int __init fsl_i2c_init(void)
479{
480 return driver_register(&fsl_i2c_driver);
481}
482
483static void __exit fsl_i2c_exit(void)
484{
485 driver_unregister(&fsl_i2c_driver);
486}
487
488module_init(fsl_i2c_init);
489module_exit(fsl_i2c_exit);
490
491#endif
492
493MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
494MODULE_DESCRIPTION
495 ("I2C-Bus adapter for MPC107 bridge and MPC824x/85xx/52xx processors");
496MODULE_LICENSE("GPL");
497
