tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * Glue code for the ISP1760 driver and bus
3 * Currently there is support for
4 * - OpenFirmware
5 * - PCI
6 * - PDEV (generic platform device centralized driver model)
7 *
8 * (c) 2007 Sebastian Siewior <bigeasy@linutronix.de>
9 *
10 */
11
12#include <linux/usb.h>
13#include <linux/io.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/usb/isp1760.h>
17#include <linux/usb/hcd.h>
18
19#include "isp1760-hcd.h"
20
21#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
22#include <linux/slab.h>
23#include <linux/of.h>
24#include <linux/of_platform.h>
25#include <linux/of_address.h>
26#include <linux/of_irq.h>
27#include <linux/of_gpio.h>
28#endif
29
30#ifdef CONFIG_PCI
31#include <linux/pci.h>
32#endif
33
34#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
35struct isp1760 {
36 struct usb_hcd *hcd;
37 int rst_gpio;
38};
39
40static int of_isp1760_probe(struct platform_device *dev)
41{
42 struct isp1760 *drvdata;
43 struct device_node *dp = dev->dev.of_node;
44 struct resource *res;
45 struct resource memory;
46 int virq;
47 resource_size_t res_len;
48 int ret;
49 unsigned int devflags = 0;
50 enum of_gpio_flags gpio_flags;
51 u32 bus_width = 0;
52
53 drvdata = kzalloc(sizeof(*drvdata), GFP_KERNEL);
54 if (!drvdata)
55 return -ENOMEM;
56
57 ret = of_address_to_resource(dp, 0, &memory);
58 if (ret) {
59 ret = -ENXIO;
60 goto free_data;
61 }
62
63 res_len = resource_size(&memory);
64
65 res = request_mem_region(memory.start, res_len, dev_name(&dev->dev));
66 if (!res) {
67 ret = -EBUSY;
68 goto free_data;
69 }
70
71 virq = irq_of_parse_and_map(dp, 0);
72 if (!virq) {
73 ret = -ENODEV;
74 goto release_reg;
75 }
76
77 if (of_device_is_compatible(dp, "nxp,usb-isp1761"))
78 devflags |= ISP1760_FLAG_ISP1761;
79
80 /* Some systems wire up only 16 of the 32 data lines */
81 of_property_read_u32(dp, "bus-width", &bus_width);
82 if (bus_width == 16)
83 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
84
85 if (of_get_property(dp, "port1-otg", NULL) != NULL)
86 devflags |= ISP1760_FLAG_OTG_EN;
87
88 if (of_get_property(dp, "analog-oc", NULL) != NULL)
89 devflags |= ISP1760_FLAG_ANALOG_OC;
90
91 if (of_get_property(dp, "dack-polarity", NULL) != NULL)
92 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
93
94 if (of_get_property(dp, "dreq-polarity", NULL) != NULL)
95 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
96
97 drvdata->rst_gpio = of_get_gpio_flags(dp, 0, &gpio_flags);
98 if (gpio_is_valid(drvdata->rst_gpio)) {
99 ret = gpio_request(drvdata->rst_gpio, dev_name(&dev->dev));
100 if (!ret) {
101 if (!(gpio_flags & OF_GPIO_ACTIVE_LOW)) {
102 devflags |= ISP1760_FLAG_RESET_ACTIVE_HIGH;
103 gpio_direction_output(drvdata->rst_gpio, 0);
104 } else {
105 gpio_direction_output(drvdata->rst_gpio, 1);
106 }
107 } else {
108 drvdata->rst_gpio = ret;
109 }
110 }
111
112 drvdata->hcd = isp1760_register(memory.start, res_len, virq,
113 IRQF_SHARED, drvdata->rst_gpio,
114 &dev->dev, dev_name(&dev->dev),
115 devflags);
116 if (IS_ERR(drvdata->hcd)) {
117 ret = PTR_ERR(drvdata->hcd);
118 goto free_gpio;
119 }
120
121 platform_set_drvdata(dev, drvdata);
122 return ret;
123
124free_gpio:
125 if (gpio_is_valid(drvdata->rst_gpio))
126 gpio_free(drvdata->rst_gpio);
127release_reg:
128 release_mem_region(memory.start, res_len);
129free_data:
130 kfree(drvdata);
131 return ret;
132}
133
134static int of_isp1760_remove(struct platform_device *dev)
135{
136 struct isp1760 *drvdata = platform_get_drvdata(dev);
137
138 usb_remove_hcd(drvdata->hcd);
139 iounmap(drvdata->hcd->regs);
140 release_mem_region(drvdata->hcd->rsrc_start, drvdata->hcd->rsrc_len);
141 usb_put_hcd(drvdata->hcd);
142
143 if (gpio_is_valid(drvdata->rst_gpio))
144 gpio_free(drvdata->rst_gpio);
145
146 kfree(drvdata);
147 return 0;
148}
149
150static const struct of_device_id of_isp1760_match[] = {
151 {
152 .compatible = "nxp,usb-isp1760",
153 },
154 {
155 .compatible = "nxp,usb-isp1761",
156 },
157 { },
158};
159MODULE_DEVICE_TABLE(of, of_isp1760_match);
160
161static struct platform_driver isp1760_of_driver = {
162 .driver = {
163 .name = "nxp-isp1760",
164 .owner = THIS_MODULE,
165 .of_match_table = of_isp1760_match,
166 },
167 .probe = of_isp1760_probe,
168 .remove = of_isp1760_remove,
169};
170#endif
171
172#ifdef CONFIG_PCI
173static int isp1761_pci_probe(struct pci_dev *dev,
174 const struct pci_device_id *id)
175{
176 u8 latency, limit;
177 __u32 reg_data;
178 int retry_count;
179 struct usb_hcd *hcd;
180 unsigned int devflags = 0;
181 int ret_status = 0;
182
183 resource_size_t pci_mem_phy0;
184 resource_size_t memlength;
185
186 u8 __iomem *chip_addr;
187 u8 __iomem *iobase;
188 resource_size_t nxp_pci_io_base;
189 resource_size_t iolength;
190
191 if (usb_disabled())
192 return -ENODEV;
193
194 if (pci_enable_device(dev) < 0)
195 return -ENODEV;
196
197 if (!dev->irq)
198 return -ENODEV;
199
200 /* Grab the PLX PCI mem maped port start address we need */
201 nxp_pci_io_base = pci_resource_start(dev, 0);
202 iolength = pci_resource_len(dev, 0);
203
204 if (!request_mem_region(nxp_pci_io_base, iolength, "ISP1761 IO MEM")) {
205 printk(KERN_ERR "request region #1\n");
206 return -EBUSY;
207 }
208
209 iobase = ioremap_nocache(nxp_pci_io_base, iolength);
210 if (!iobase) {
211 printk(KERN_ERR "ioremap #1\n");
212 ret_status = -ENOMEM;
213 goto cleanup1;
214 }
215 /* Grab the PLX PCI shared memory of the ISP 1761 we need */
216 pci_mem_phy0 = pci_resource_start(dev, 3);
217 memlength = pci_resource_len(dev, 3);
218 if (memlength < 0xffff) {
219 printk(KERN_ERR "memory length for this resource is wrong\n");
220 ret_status = -ENOMEM;
221 goto cleanup2;
222 }
223
224 if (!request_mem_region(pci_mem_phy0, memlength, "ISP-PCI")) {
225 printk(KERN_ERR "host controller already in use\n");
226 ret_status = -EBUSY;
227 goto cleanup2;
228 }
229
230 /* map available memory */
231 chip_addr = ioremap_nocache(pci_mem_phy0,memlength);
232 if (!chip_addr) {
233 printk(KERN_ERR "Error ioremap failed\n");
234 ret_status = -ENOMEM;
235 goto cleanup3;
236 }
237
238 /* bad pci latencies can contribute to overruns */
239 pci_read_config_byte(dev, PCI_LATENCY_TIMER, &latency);
240 if (latency) {
241 pci_read_config_byte(dev, PCI_MAX_LAT, &limit);
242 if (limit && limit < latency)
243 pci_write_config_byte(dev, PCI_LATENCY_TIMER, limit);
244 }
245
246 /* Try to check whether we can access Scratch Register of
247 * Host Controller or not. The initial PCI access is retried until
248 * local init for the PCI bridge is completed
249 */
250 retry_count = 20;
251 reg_data = 0;
252 while ((reg_data != 0xFACE) && retry_count) {
253 /*by default host is in 16bit mode, so
254 * io operations at this stage must be 16 bit
255 * */
256 writel(0xface, chip_addr + HC_SCRATCH_REG);
257 udelay(100);
258 reg_data = readl(chip_addr + HC_SCRATCH_REG) & 0x0000ffff;
259 retry_count--;
260 }
261
262 iounmap(chip_addr);
263
264 /* Host Controller presence is detected by writing to scratch register
265 * and reading back and checking the contents are same or not
266 */
267 if (reg_data != 0xFACE) {
268 dev_err(&dev->dev, "scratch register mismatch %x\n", reg_data);
269 ret_status = -ENOMEM;
270 goto cleanup3;
271 }
272
273 pci_set_master(dev);
274
275 /* configure PLX PCI chip to pass interrupts */
276#define PLX_INT_CSR_REG 0x68
277 reg_data = readl(iobase + PLX_INT_CSR_REG);
278 reg_data |= 0x900;
279 writel(reg_data, iobase + PLX_INT_CSR_REG);
280
281 dev->dev.dma_mask = NULL;
282 hcd = isp1760_register(pci_mem_phy0, memlength, dev->irq,
283 IRQF_SHARED, -ENOENT, &dev->dev, dev_name(&dev->dev),
284 devflags);
285 if (IS_ERR(hcd)) {
286 ret_status = -ENODEV;
287 goto cleanup3;
288 }
289
290 /* done with PLX IO access */
291 iounmap(iobase);
292 release_mem_region(nxp_pci_io_base, iolength);
293
294 pci_set_drvdata(dev, hcd);
295 return 0;
296
297cleanup3:
298 release_mem_region(pci_mem_phy0, memlength);
299cleanup2:
300 iounmap(iobase);
301cleanup1:
302 release_mem_region(nxp_pci_io_base, iolength);
303 return ret_status;
304}
305
306static void isp1761_pci_remove(struct pci_dev *dev)
307{
308 struct usb_hcd *hcd;
309
310 hcd = pci_get_drvdata(dev);
311
312 usb_remove_hcd(hcd);
313 iounmap(hcd->regs);
314 release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
315 usb_put_hcd(hcd);
316
317 pci_disable_device(dev);
318}
319
320static void isp1761_pci_shutdown(struct pci_dev *dev)
321{
322 printk(KERN_ERR "ips1761_pci_shutdown\n");
323}
324
325static const struct pci_device_id isp1760_plx [] = {
326 {
327 .class = PCI_CLASS_BRIDGE_OTHER << 8,
328 .class_mask = ~0,
329 .vendor = PCI_VENDOR_ID_PLX,
330 .device = 0x5406,
331 .subvendor = PCI_VENDOR_ID_PLX,
332 .subdevice = 0x9054,
333 },
334 { }
335};
336MODULE_DEVICE_TABLE(pci, isp1760_plx);
337
338static struct pci_driver isp1761_pci_driver = {
339 .name = "isp1760",
340 .id_table = isp1760_plx,
341 .probe = isp1761_pci_probe,
342 .remove = isp1761_pci_remove,
343 .shutdown = isp1761_pci_shutdown,
344};
345#endif
346
347static int isp1760_plat_probe(struct platform_device *pdev)
348{
349 int ret = 0;
350 struct usb_hcd *hcd;
351 struct resource *mem_res;
352 struct resource *irq_res;
353 resource_size_t mem_size;
354 struct isp1760_platform_data *priv = dev_get_platdata(&pdev->dev);
355 unsigned int devflags = 0;
356 unsigned long irqflags = IRQF_SHARED;
357
358 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
359 if (!mem_res) {
360 pr_warning("isp1760: Memory resource not available\n");
361 ret = -ENODEV;
362 goto out;
363 }
364 mem_size = resource_size(mem_res);
365 if (!request_mem_region(mem_res->start, mem_size, "isp1760")) {
366 pr_warning("isp1760: Cannot reserve the memory resource\n");
367 ret = -EBUSY;
368 goto out;
369 }
370
371 irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
372 if (!irq_res) {
373 pr_warning("isp1760: IRQ resource not available\n");
374 ret = -ENODEV;
375 goto cleanup;
376 }
377
378 irqflags |= irq_res->flags & IRQF_TRIGGER_MASK;
379
380 if (priv) {
381 if (priv->is_isp1761)
382 devflags |= ISP1760_FLAG_ISP1761;
383 if (priv->bus_width_16)
384 devflags |= ISP1760_FLAG_BUS_WIDTH_16;
385 if (priv->port1_otg)
386 devflags |= ISP1760_FLAG_OTG_EN;
387 if (priv->analog_oc)
388 devflags |= ISP1760_FLAG_ANALOG_OC;
389 if (priv->dack_polarity_high)
390 devflags |= ISP1760_FLAG_DACK_POL_HIGH;
391 if (priv->dreq_polarity_high)
392 devflags |= ISP1760_FLAG_DREQ_POL_HIGH;
393 }
394
395 hcd = isp1760_register(mem_res->start, mem_size, irq_res->start,
396 irqflags, -ENOENT,
397 &pdev->dev, dev_name(&pdev->dev), devflags);
398
399 platform_set_drvdata(pdev, hcd);
400
401 if (IS_ERR(hcd)) {
402 pr_warning("isp1760: Failed to register the HCD device\n");
403 ret = -ENODEV;
404 goto cleanup;
405 }
406
407 pr_info("ISP1760 USB device initialised\n");
408 return ret;
409
410cleanup:
411 release_mem_region(mem_res->start, mem_size);
412out:
413 return ret;
414}
415
416static int isp1760_plat_remove(struct platform_device *pdev)
417{
418 struct resource *mem_res;
419 resource_size_t mem_size;
420 struct usb_hcd *hcd = platform_get_drvdata(pdev);
421
422 usb_remove_hcd(hcd);
423
424 mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
425 mem_size = resource_size(mem_res);
426 release_mem_region(mem_res->start, mem_size);
427
428 usb_put_hcd(hcd);
429
430 return 0;
431}
432
433static struct platform_driver isp1760_plat_driver = {
434 .probe = isp1760_plat_probe,
435 .remove = isp1760_plat_remove,
436 .driver = {
437 .name = "isp1760",
438 },
439};
440
441static int __init isp1760_init(void)
442{
443 int ret, any_ret = -ENODEV;
444
445 init_kmem_once();
446
447 ret = platform_driver_register(&isp1760_plat_driver);
448 if (!ret)
449 any_ret = 0;
450#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
451 ret = platform_driver_register(&isp1760_of_driver);
452 if (!ret)
453 any_ret = 0;
454#endif
455#ifdef CONFIG_PCI
456 ret = pci_register_driver(&isp1761_pci_driver);
457 if (!ret)
458 any_ret = 0;
459#endif
460
461 if (any_ret)
462 deinit_kmem_cache();
463 return any_ret;
464}
465module_init(isp1760_init);
466
467static void __exit isp1760_exit(void)
468{
469 platform_driver_unregister(&isp1760_plat_driver);
470#if defined(CONFIG_OF) && defined(CONFIG_OF_IRQ)
471 platform_driver_unregister(&isp1760_of_driver);
472#endif
473#ifdef CONFIG_PCI
474 pci_unregister_driver(&isp1761_pci_driver);
475#endif
476 deinit_kmem_cache();
477}
478module_exit(isp1760_exit);