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authorJohn Linn <john.linn@xilinx.com>2009-01-09 18:01:53 -0500
committerGrant Likely <grant.likely@secretlab.ca>2009-01-09 18:01:53 -0500
commitff82c587a9a4cb8796e7e04377155deba15ae18b (patch)
tree04502cdfdd5b188df96633adc6ab9a1fb093b9ba /drivers
parent2526c151c31358aec66b63921dd712bbec5ee0cb (diff)
Xilinx: SPI: updated driver for device tree
The driver was updated to use the device tree rather than the platform data. Signed-off-by: John Linn <john.linn@xilinx.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/spi/xilinx_spi.c137
1 files changed, 81 insertions, 56 deletions
diff --git a/drivers/spi/xilinx_spi.c b/drivers/spi/xilinx_spi.c
index 68d6f4988fb5..fe7e5f35e5d0 100644
--- a/drivers/spi/xilinx_spi.c
+++ b/drivers/spi/xilinx_spi.c
@@ -15,12 +15,15 @@
15#include <linux/init.h> 15#include <linux/init.h>
16#include <linux/interrupt.h> 16#include <linux/interrupt.h>
17#include <linux/platform_device.h> 17#include <linux/platform_device.h>
18
19#include <linux/of_platform.h>
20#include <linux/of_device.h>
21#include <linux/of_spi.h>
22
18#include <linux/spi/spi.h> 23#include <linux/spi/spi.h>
19#include <linux/spi/spi_bitbang.h> 24#include <linux/spi/spi_bitbang.h>
20#include <linux/io.h> 25#include <linux/io.h>
21 26
22#include <syslib/virtex_devices.h>
23
24#define XILINX_SPI_NAME "xilinx_spi" 27#define XILINX_SPI_NAME "xilinx_spi"
25 28
26/* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e) 29/* Register definitions as per "OPB Serial Peripheral Interface (SPI) (v1.00e)
@@ -144,23 +147,14 @@ static int xilinx_spi_setup_transfer(struct spi_device *spi,
144 struct spi_transfer *t) 147 struct spi_transfer *t)
145{ 148{
146 u8 bits_per_word; 149 u8 bits_per_word;
147 u32 hz;
148 struct xilinx_spi *xspi = spi_master_get_devdata(spi->master);
149 150
150 bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word; 151 bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
151 hz = (t) ? t->speed_hz : spi->max_speed_hz;
152 if (bits_per_word != 8) { 152 if (bits_per_word != 8) {
153 dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n", 153 dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
154 __func__, bits_per_word); 154 __func__, bits_per_word);
155 return -EINVAL; 155 return -EINVAL;
156 } 156 }
157 157
158 if (hz && xspi->speed_hz > hz) {
159 dev_err(&spi->dev, "%s, unsupported clock rate %uHz\n",
160 __func__, hz);
161 return -EINVAL;
162 }
163
164 return 0; 158 return 0;
165} 159}
166 160
@@ -304,32 +298,38 @@ static irqreturn_t xilinx_spi_irq(int irq, void *dev_id)
304 return IRQ_HANDLED; 298 return IRQ_HANDLED;
305} 299}
306 300
307static int __init xilinx_spi_probe(struct platform_device *dev) 301static int __init xilinx_spi_of_probe(struct of_device *ofdev,
302 const struct of_device_id *match)
308{ 303{
309 int ret = 0;
310 struct spi_master *master; 304 struct spi_master *master;
311 struct xilinx_spi *xspi; 305 struct xilinx_spi *xspi;
312 struct xspi_platform_data *pdata; 306 struct resource r_irq_struct;
313 struct resource *r; 307 struct resource r_mem_struct;
308
309 struct resource *r_irq = &r_irq_struct;
310 struct resource *r_mem = &r_mem_struct;
311 int rc = 0;
312 const u32 *prop;
313 int len;
314 314
315 /* Get resources(memory, IRQ) associated with the device */ 315 /* Get resources(memory, IRQ) associated with the device */
316 master = spi_alloc_master(&dev->dev, sizeof(struct xilinx_spi)); 316 master = spi_alloc_master(&ofdev->dev, sizeof(struct xilinx_spi));
317 317
318 if (master == NULL) { 318 if (master == NULL) {
319 return -ENOMEM; 319 return -ENOMEM;
320 } 320 }
321 321
322 platform_set_drvdata(dev, master); 322 dev_set_drvdata(&ofdev->dev, master);
323 pdata = dev->dev.platform_data;
324 323
325 if (pdata == NULL) { 324 rc = of_address_to_resource(ofdev->node, 0, r_mem);
326 ret = -ENODEV; 325 if (rc) {
326 dev_warn(&ofdev->dev, "invalid address\n");
327 goto put_master; 327 goto put_master;
328 } 328 }
329 329
330 r = platform_get_resource(dev, IORESOURCE_MEM, 0); 330 rc = of_irq_to_resource(ofdev->node, 0, r_irq);
331 if (r == NULL) { 331 if (rc == NO_IRQ) {
332 ret = -ENODEV; 332 dev_warn(&ofdev->dev, "no IRQ found\n");
333 goto put_master; 333 goto put_master;
334 } 334 }
335 335
@@ -341,47 +341,57 @@ static int __init xilinx_spi_probe(struct platform_device *dev)
341 xspi->bitbang.master->setup = xilinx_spi_setup; 341 xspi->bitbang.master->setup = xilinx_spi_setup;
342 init_completion(&xspi->done); 342 init_completion(&xspi->done);
343 343
344 if (!request_mem_region(r->start, 344 xspi->irq = r_irq->start;
345 r->end - r->start + 1, XILINX_SPI_NAME)) { 345
346 ret = -ENXIO; 346 if (!request_mem_region(r_mem->start,
347 r_mem->end - r_mem->start + 1, XILINX_SPI_NAME)) {
348 rc = -ENXIO;
349 dev_warn(&ofdev->dev, "memory request failure\n");
347 goto put_master; 350 goto put_master;
348 } 351 }
349 352
350 xspi->regs = ioremap(r->start, r->end - r->start + 1); 353 xspi->regs = ioremap(r_mem->start, r_mem->end - r_mem->start + 1);
351 if (xspi->regs == NULL) { 354 if (xspi->regs == NULL) {
352 ret = -ENOMEM; 355 rc = -ENOMEM;
356 dev_warn(&ofdev->dev, "ioremap failure\n");
353 goto put_master; 357 goto put_master;
354 } 358 }
359 xspi->irq = r_irq->start;
355 360
356 ret = platform_get_irq(dev, 0); 361 /* dynamic bus assignment */
357 if (ret < 0) { 362 master->bus_num = -1;
358 ret = -ENXIO;
359 goto unmap_io;
360 }
361 xspi->irq = ret;
362 363
363 master->bus_num = pdata->bus_num; 364 /* number of slave select bits is required */
364 master->num_chipselect = pdata->num_chipselect; 365 prop = of_get_property(ofdev->node, "xlnx,num-ss-bits", &len);
365 xspi->speed_hz = pdata->speed_hz; 366 if (!prop || len < sizeof(*prop)) {
367 dev_warn(&ofdev->dev, "no 'xlnx,num-ss-bits' property\n");
368 goto put_master;
369 }
370 master->num_chipselect = *prop;
366 371
367 /* SPI controller initializations */ 372 /* SPI controller initializations */
368 xspi_init_hw(xspi->regs); 373 xspi_init_hw(xspi->regs);
369 374
370 /* Register for SPI Interrupt */ 375 /* Register for SPI Interrupt */
371 ret = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi); 376 rc = request_irq(xspi->irq, xilinx_spi_irq, 0, XILINX_SPI_NAME, xspi);
372 if (ret != 0) 377 if (rc != 0) {
378 dev_warn(&ofdev->dev, "irq request failure: %d\n", xspi->irq);
373 goto unmap_io; 379 goto unmap_io;
380 }
374 381
375 ret = spi_bitbang_start(&xspi->bitbang); 382 rc = spi_bitbang_start(&xspi->bitbang);
376 if (ret != 0) { 383 if (rc != 0) {
377 dev_err(&dev->dev, "spi_bitbang_start FAILED\n"); 384 dev_err(&ofdev->dev, "spi_bitbang_start FAILED\n");
378 goto free_irq; 385 goto free_irq;
379 } 386 }
380 387
381 dev_info(&dev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n", 388 dev_info(&ofdev->dev, "at 0x%08X mapped to 0x%08X, irq=%d\n",
382 r->start, (u32)xspi->regs, xspi->irq); 389 (unsigned int)r_mem->start, (u32)xspi->regs, xspi->irq);
383 390
384 return ret; 391 /* Add any subnodes on the SPI bus */
392 of_register_spi_devices(master, ofdev->node);
393
394 return rc;
385 395
386free_irq: 396free_irq:
387 free_irq(xspi->irq, xspi); 397 free_irq(xspi->irq, xspi);
@@ -389,21 +399,21 @@ unmap_io:
389 iounmap(xspi->regs); 399 iounmap(xspi->regs);
390put_master: 400put_master:
391 spi_master_put(master); 401 spi_master_put(master);
392 return ret; 402 return rc;
393} 403}
394 404
395static int __devexit xilinx_spi_remove(struct platform_device *dev) 405static int __devexit xilinx_spi_remove(struct of_device *ofdev)
396{ 406{
397 struct xilinx_spi *xspi; 407 struct xilinx_spi *xspi;
398 struct spi_master *master; 408 struct spi_master *master;
399 409
400 master = platform_get_drvdata(dev); 410 master = platform_get_drvdata(ofdev);
401 xspi = spi_master_get_devdata(master); 411 xspi = spi_master_get_devdata(master);
402 412
403 spi_bitbang_stop(&xspi->bitbang); 413 spi_bitbang_stop(&xspi->bitbang);
404 free_irq(xspi->irq, xspi); 414 free_irq(xspi->irq, xspi);
405 iounmap(xspi->regs); 415 iounmap(xspi->regs);
406 platform_set_drvdata(dev, 0); 416 dev_set_drvdata(&ofdev->dev, 0);
407 spi_master_put(xspi->bitbang.master); 417 spi_master_put(xspi->bitbang.master);
408 418
409 return 0; 419 return 0;
@@ -412,27 +422,42 @@ static int __devexit xilinx_spi_remove(struct platform_device *dev)
412/* work with hotplug and coldplug */ 422/* work with hotplug and coldplug */
413MODULE_ALIAS("platform:" XILINX_SPI_NAME); 423MODULE_ALIAS("platform:" XILINX_SPI_NAME);
414 424
415static struct platform_driver xilinx_spi_driver = { 425static int __exit xilinx_spi_of_remove(struct of_device *op)
416 .probe = xilinx_spi_probe, 426{
417 .remove = __devexit_p(xilinx_spi_remove), 427 return xilinx_spi_remove(op);
428}
429
430static struct of_device_id xilinx_spi_of_match[] = {
431 { .compatible = "xlnx,xps-spi-2.00.a", },
432 { .compatible = "xlnx,xps-spi-2.00.b", },
433 {}
434};
435
436MODULE_DEVICE_TABLE(of, xilinx_spi_of_match);
437
438static struct of_platform_driver xilinx_spi_of_driver = {
439 .owner = THIS_MODULE,
440 .name = "xilinx-xps-spi",
441 .match_table = xilinx_spi_of_match,
442 .probe = xilinx_spi_of_probe,
443 .remove = __exit_p(xilinx_spi_of_remove),
418 .driver = { 444 .driver = {
419 .name = XILINX_SPI_NAME, 445 .name = "xilinx-xps-spi",
420 .owner = THIS_MODULE, 446 .owner = THIS_MODULE,
421 }, 447 },
422}; 448};
423 449
424static int __init xilinx_spi_init(void) 450static int __init xilinx_spi_init(void)
425{ 451{
426 return platform_driver_register(&xilinx_spi_driver); 452 return of_register_platform_driver(&xilinx_spi_of_driver);
427} 453}
428module_init(xilinx_spi_init); 454module_init(xilinx_spi_init);
429 455
430static void __exit xilinx_spi_exit(void) 456static void __exit xilinx_spi_exit(void)
431{ 457{
432 platform_driver_unregister(&xilinx_spi_driver); 458 of_unregister_platform_driver(&xilinx_spi_of_driver);
433} 459}
434module_exit(xilinx_spi_exit); 460module_exit(xilinx_spi_exit);
435
436MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>"); 461MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
437MODULE_DESCRIPTION("Xilinx SPI driver"); 462MODULE_DESCRIPTION("Xilinx SPI driver");
438MODULE_LICENSE("GPL"); 463MODULE_LICENSE("GPL");