2 * core.c - ChipIdea USB IP core family device controller
4 * Copyright (C) 2008 Chipidea - MIPS Technologies, Inc. All rights reserved.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
14 * Description: ChipIdea USB IP core family device controller
16 * This driver is composed of several blocks:
17 * - HW: hardware interface
18 * - DBG: debug facilities (optional)
20 * - ISR: interrupts handling
21 * - ENDPT: endpoint operations (Gadget API)
22 * - GADGET: gadget operations (Gadget API)
23 * - BUS: bus glue code, bus abstraction layer
26 * - CONFIG_USB_GADGET_DEBUG_FILES: enable debug facilities
27 * - STALL_IN: non-empty bulk-in pipes cannot be halted
28 * if defined mass storage compliance succeeds but with warnings
32 * if undefined usbtest 13 fails
33 * - TRACE: enable function tracing (depends on DEBUG)
36 * - Chapter 9 & Mass Storage Compliance with Gadget File Storage
37 * - Chapter 9 Compliance with Gadget Zero (STALL_IN undefined)
38 * - Normal & LPM support
41 * - OK: 0-12, 13 (STALL_IN defined) & 14
42 * - Not Supported: 15 & 16 (ISO)
46 * - Isochronous & Interrupt Traffic
47 * - Handle requests which spawns into several TDs
48 * - GET_STATUS(device) - always reports 0
49 * - Gadget API (majority of optional features)
50 * - Suspend & Remote Wakeup
52 #include <linux/delay.h>
53 #include <linux/device.h>
54 #include <linux/dmapool.h>
55 #include <linux/dma-mapping.h>
56 #include <linux/init.h>
57 #include <linux/platform_device.h>
58 #include <linux/module.h>
59 #include <linux/idr.h>
60 #include <linux/interrupt.h>
62 #include <linux/irq.h>
63 #include <linux/kernel.h>
64 #include <linux/slab.h>
65 #include <linux/pm_runtime.h>
66 #include <linux/usb/ch9.h>
67 #include <linux/usb/gadget.h>
68 #include <linux/usb/otg.h>
69 #include <linux/usb/chipidea.h>
77 /* Controller register map */
78 static uintptr_t ci_regs_nolpm[] = {
79 [CAP_CAPLENGTH] = 0x000UL,
80 [CAP_HCCPARAMS] = 0x008UL,
81 [CAP_DCCPARAMS] = 0x024UL,
82 [CAP_TESTMODE] = 0x038UL,
83 [OP_USBCMD] = 0x000UL,
84 [OP_USBSTS] = 0x004UL,
85 [OP_USBINTR] = 0x008UL,
86 [OP_DEVICEADDR] = 0x014UL,
87 [OP_ENDPTLISTADDR] = 0x018UL,
88 [OP_PORTSC] = 0x044UL,
91 [OP_USBMODE] = 0x068UL,
92 [OP_ENDPTSETUPSTAT] = 0x06CUL,
93 [OP_ENDPTPRIME] = 0x070UL,
94 [OP_ENDPTFLUSH] = 0x074UL,
95 [OP_ENDPTSTAT] = 0x078UL,
96 [OP_ENDPTCOMPLETE] = 0x07CUL,
97 [OP_ENDPTCTRL] = 0x080UL,
100 static uintptr_t ci_regs_lpm[] = {
101 [CAP_CAPLENGTH] = 0x000UL,
102 [CAP_HCCPARAMS] = 0x008UL,
103 [CAP_DCCPARAMS] = 0x024UL,
104 [CAP_TESTMODE] = 0x0FCUL,
105 [OP_USBCMD] = 0x000UL,
106 [OP_USBSTS] = 0x004UL,
107 [OP_USBINTR] = 0x008UL,
108 [OP_DEVICEADDR] = 0x014UL,
109 [OP_ENDPTLISTADDR] = 0x018UL,
110 [OP_PORTSC] = 0x044UL,
111 [OP_DEVLC] = 0x084UL,
112 [OP_OTGSC] = 0x0C4UL,
113 [OP_USBMODE] = 0x0C8UL,
114 [OP_ENDPTSETUPSTAT] = 0x0D8UL,
115 [OP_ENDPTPRIME] = 0x0DCUL,
116 [OP_ENDPTFLUSH] = 0x0E0UL,
117 [OP_ENDPTSTAT] = 0x0E4UL,
118 [OP_ENDPTCOMPLETE] = 0x0E8UL,
119 [OP_ENDPTCTRL] = 0x0ECUL,
122 static int hw_alloc_regmap(struct ci13xxx *ci, bool is_lpm)
126 kfree(ci->hw_bank.regmap);
128 ci->hw_bank.regmap = kzalloc((OP_LAST + 1) * sizeof(void *),
130 if (!ci->hw_bank.regmap)
133 for (i = 0; i < OP_ENDPTCTRL; i++)
134 ci->hw_bank.regmap[i] =
135 (i <= CAP_LAST ? ci->hw_bank.cap : ci->hw_bank.op) +
136 (is_lpm ? ci_regs_lpm[i] : ci_regs_nolpm[i]);
138 for (; i <= OP_LAST; i++)
139 ci->hw_bank.regmap[i] = ci->hw_bank.op +
140 4 * (i - OP_ENDPTCTRL) +
142 ? ci_regs_lpm[OP_ENDPTCTRL]
143 : ci_regs_nolpm[OP_ENDPTCTRL]);
149 * hw_port_test_set: writes port test mode (execute without interruption)
152 * This function returns an error code
154 int hw_port_test_set(struct ci13xxx *ci, u8 mode)
156 const u8 TEST_MODE_MAX = 7;
158 if (mode > TEST_MODE_MAX)
161 hw_write(ci, OP_PORTSC, PORTSC_PTC, mode << ffs_nr(PORTSC_PTC));
166 * hw_port_test_get: reads port test mode value
168 * This function returns port test mode value
170 u8 hw_port_test_get(struct ci13xxx *ci)
172 return hw_read(ci, OP_PORTSC, PORTSC_PTC) >> ffs_nr(PORTSC_PTC);
175 static int hw_device_init(struct ci13xxx *ci, void __iomem *base)
179 /* bank is a module variable */
180 ci->hw_bank.abs = base;
182 ci->hw_bank.cap = ci->hw_bank.abs;
183 ci->hw_bank.cap += ci->platdata->capoffset;
184 ci->hw_bank.op = ci->hw_bank.cap + ioread8(ci->hw_bank.cap);
186 hw_alloc_regmap(ci, false);
187 reg = hw_read(ci, CAP_HCCPARAMS, HCCPARAMS_LEN) >>
188 ffs_nr(HCCPARAMS_LEN);
189 ci->hw_bank.lpm = reg;
190 hw_alloc_regmap(ci, !!reg);
191 ci->hw_bank.size = ci->hw_bank.op - ci->hw_bank.abs;
192 ci->hw_bank.size += OP_LAST;
193 ci->hw_bank.size /= sizeof(u32);
195 reg = hw_read(ci, CAP_DCCPARAMS, DCCPARAMS_DEN) >>
196 ffs_nr(DCCPARAMS_DEN);
197 ci->hw_ep_max = reg * 2; /* cache hw ENDPT_MAX */
199 if (ci->hw_ep_max > ENDPT_MAX)
202 dev_dbg(ci->dev, "ChipIdea HDRC found, lpm: %d; cap: %p op: %p\n",
203 ci->hw_bank.lpm, ci->hw_bank.cap, ci->hw_bank.op);
205 /* setup lock mode ? */
207 /* ENDPTSETUPSTAT is '0' by default */
209 /* HCSPARAMS.bf.ppc SHOULD BE zero for device */
215 * hw_device_reset: resets chip (execute without interruption)
216 * @ci: the controller
218 * This function returns an error code
220 int hw_device_reset(struct ci13xxx *ci, u32 mode)
222 /* should flush & stop before reset */
223 hw_write(ci, OP_ENDPTFLUSH, ~0, ~0);
224 hw_write(ci, OP_USBCMD, USBCMD_RS, 0);
226 hw_write(ci, OP_USBCMD, USBCMD_RST, USBCMD_RST);
227 while (hw_read(ci, OP_USBCMD, USBCMD_RST))
228 udelay(10); /* not RTOS friendly */
231 if (ci->platdata->notify_event)
232 ci->platdata->notify_event(ci,
233 CI13XXX_CONTROLLER_RESET_EVENT);
235 if (ci->platdata->flags & CI13XXX_DISABLE_STREAMING)
236 hw_write(ci, OP_USBMODE, USBMODE_CI_SDIS, USBMODE_CI_SDIS);
238 /* USBMODE should be configured step by step */
239 hw_write(ci, OP_USBMODE, USBMODE_CM, USBMODE_CM_IDLE);
240 hw_write(ci, OP_USBMODE, USBMODE_CM, mode);
242 hw_write(ci, OP_USBMODE, USBMODE_SLOM, USBMODE_SLOM);
244 if (hw_read(ci, OP_USBMODE, USBMODE_CM) != mode) {
245 pr_err("cannot enter in %s mode", ci_role(ci)->name);
246 pr_err("lpm = %i", ci->hw_bank.lpm);
254 * ci_otg_role - pick role based on ID pin state
255 * @ci: the controller
257 static enum ci_role ci_otg_role(struct ci13xxx *ci)
259 u32 sts = hw_read(ci, OP_OTGSC, ~0);
260 enum ci_role role = sts & OTGSC_ID
268 * ci_role_work - perform role changing based on ID pin
271 static void ci_role_work(struct work_struct *work)
273 struct ci13xxx *ci = container_of(work, struct ci13xxx, work);
274 enum ci_role role = ci_otg_role(ci);
276 if (role != ci->role) {
277 dev_dbg(ci->dev, "switching from %s to %s\n",
278 ci_role(ci)->name, ci->roles[role]->name);
281 ci_role_start(ci, role);
286 static ssize_t show_role(struct device *dev, struct device_attribute *attr,
289 struct ci13xxx *ci = dev_get_drvdata(dev);
291 return sprintf(buf, "%s\n", ci_role(ci)->name);
294 static ssize_t store_role(struct device *dev, struct device_attribute *attr,
295 const char *buf, size_t count)
297 struct ci13xxx *ci = dev_get_drvdata(dev);
301 for (role = CI_ROLE_HOST; role < CI_ROLE_END; role++)
302 if (ci->roles[role] && !strcmp(buf, ci->roles[role]->name))
305 if (role == CI_ROLE_END || role == ci->role)
309 ret = ci_role_start(ci, role);
316 static DEVICE_ATTR(role, S_IRUSR | S_IWUSR, show_role, store_role);
318 static irqreturn_t ci_irq(int irq, void *data)
320 struct ci13xxx *ci = data;
321 irqreturn_t ret = IRQ_NONE;
325 otgsc = hw_read(ci, OP_OTGSC, ~0);
327 if (ci->role != CI_ROLE_END)
328 ret = ci_role(ci)->irq(ci);
330 if (ci->is_otg && (otgsc & OTGSC_IDIS)) {
331 hw_write(ci, OP_OTGSC, OTGSC_IDIS, OTGSC_IDIS);
332 disable_irq_nosync(ci->irq);
333 queue_work(ci->wq, &ci->work);
340 static DEFINE_IDA(ci_ida);
342 struct platform_device *ci13xxx_add_device(struct device *dev,
343 struct resource *res, int nres,
344 struct ci13xxx_platform_data *platdata)
346 struct platform_device *pdev;
349 id = ida_simple_get(&ci_ida, 0, 0, GFP_KERNEL);
353 pdev = platform_device_alloc("ci_hdrc", id);
359 pdev->dev.parent = dev;
360 pdev->dev.dma_mask = dev->dma_mask;
361 pdev->dev.dma_parms = dev->dma_parms;
362 dma_set_coherent_mask(&pdev->dev, dev->coherent_dma_mask);
364 ret = platform_device_add_resources(pdev, res, nres);
368 ret = platform_device_add_data(pdev, platdata, sizeof(*platdata));
372 ret = platform_device_add(pdev);
379 platform_device_put(pdev);
381 ida_simple_remove(&ci_ida, id);
384 EXPORT_SYMBOL_GPL(ci13xxx_add_device);
386 void ci13xxx_remove_device(struct platform_device *pdev)
389 platform_device_unregister(pdev);
390 ida_simple_remove(&ci_ida, id);
392 EXPORT_SYMBOL_GPL(ci13xxx_remove_device);
394 static int ci_hdrc_probe(struct platform_device *pdev)
396 struct device *dev = &pdev->dev;
398 struct resource *res;
402 if (!dev->platform_data) {
403 dev_err(dev, "platform data missing\n");
407 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
409 dev_err(dev, "missing resource\n");
413 base = devm_request_and_ioremap(dev, res);
415 dev_err(dev, "can't request and ioremap resource\n");
419 ci = devm_kzalloc(dev, sizeof(*ci), GFP_KERNEL);
421 dev_err(dev, "can't allocate device\n");
426 ci->platdata = dev->platform_data;
427 if (ci->platdata->phy)
428 ci->transceiver = ci->platdata->phy;
430 ci->global_phy = true;
432 ret = hw_device_init(ci, base);
434 dev_err(dev, "can't initialize hardware\n");
438 ci->hw_bank.phys = res->start;
440 ci->irq = platform_get_irq(pdev, 0);
442 dev_err(dev, "missing IRQ\n");
446 INIT_WORK(&ci->work, ci_role_work);
447 ci->wq = create_singlethread_workqueue("ci_otg");
449 dev_err(dev, "can't create workqueue\n");
453 /* initialize role(s) before the interrupt is requested */
454 ret = ci_hdrc_host_init(ci);
456 dev_info(dev, "doesn't support host\n");
458 ret = ci_hdrc_gadget_init(ci);
460 dev_info(dev, "doesn't support gadget\n");
462 if (!ci->roles[CI_ROLE_HOST] && !ci->roles[CI_ROLE_GADGET]) {
463 dev_err(dev, "no supported roles\n");
468 if (ci->roles[CI_ROLE_HOST] && ci->roles[CI_ROLE_GADGET]) {
470 /* ID pin needs 1ms debouce time, we delay 2ms for safe */
472 ci->role = ci_otg_role(ci);
474 ci->role = ci->roles[CI_ROLE_HOST]
479 ret = ci_role_start(ci, ci->role);
481 dev_err(dev, "can't start %s role\n", ci_role(ci)->name);
486 platform_set_drvdata(pdev, ci);
487 ret = request_irq(ci->irq, ci_irq, IRQF_SHARED, ci->platdata->name,
492 ret = device_create_file(dev, &dev_attr_role);
497 hw_write(ci, OP_OTGSC, OTGSC_IDIE, OTGSC_IDIE);
502 device_remove_file(dev, &dev_attr_role);
506 flush_workqueue(ci->wq);
507 destroy_workqueue(ci->wq);
512 static int ci_hdrc_remove(struct platform_device *pdev)
514 struct ci13xxx *ci = platform_get_drvdata(pdev);
516 flush_workqueue(ci->wq);
517 destroy_workqueue(ci->wq);
518 device_remove_file(ci->dev, &dev_attr_role);
519 free_irq(ci->irq, ci);
525 static struct platform_driver ci_hdrc_driver = {
526 .probe = ci_hdrc_probe,
527 .remove = ci_hdrc_remove,
533 module_platform_driver(ci_hdrc_driver);
535 MODULE_ALIAS("platform:ci_hdrc");
536 MODULE_ALIAS("platform:ci13xxx");
537 MODULE_LICENSE("GPL v2");
539 MODULE_DESCRIPTION("ChipIdea HDRC Driver");