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 hw_write(ci
, OP_OTGSC
, OTGSC_IDIS
, OTGSC_IDIS
);
278 if (role
!= ci
->role
) {
279 dev_dbg(ci
->dev
, "switching from %s to %s\n",
280 ci_role(ci
)->name
, ci
->roles
[role
]->name
);
283 ci_role_start(ci
, role
);
287 static ssize_t
show_role(struct device
*dev
, struct device_attribute
*attr
,
290 struct ci13xxx
*ci
= dev_get_drvdata(dev
);
292 return sprintf(buf
, "%s\n", ci_role(ci
)->name
);
295 static ssize_t
store_role(struct device
*dev
, struct device_attribute
*attr
,
296 const char *buf
, size_t count
)
298 struct ci13xxx
*ci
= dev_get_drvdata(dev
);
302 for (role
= CI_ROLE_HOST
; role
< CI_ROLE_END
; role
++)
303 if (ci
->roles
[role
] && !strcmp(buf
, ci
->roles
[role
]->name
))
306 if (role
== CI_ROLE_END
|| role
== ci
->role
)
310 ret
= ci_role_start(ci
, role
);
317 static DEVICE_ATTR(role
, S_IRUSR
| S_IWUSR
, show_role
, store_role
);
319 static irqreturn_t
ci_irq(int irq
, void *data
)
321 struct ci13xxx
*ci
= data
;
322 irqreturn_t ret
= IRQ_NONE
;
325 u32 sts
= hw_read(ci
, OP_OTGSC
, ~0);
327 if (sts
& OTGSC_IDIS
) {
328 queue_work(ci
->wq
, &ci
->work
);
333 return ci
->role
== CI_ROLE_END
? ret
: ci_role(ci
)->irq(ci
);
336 static DEFINE_IDA(ci_ida
);
338 struct platform_device
*ci13xxx_add_device(struct device
*dev
,
339 struct resource
*res
, int nres
,
340 struct ci13xxx_platform_data
*platdata
)
342 struct platform_device
*pdev
;
345 id
= ida_simple_get(&ci_ida
, 0, 0, GFP_KERNEL
);
349 pdev
= platform_device_alloc("ci_hdrc", id
);
355 pdev
->dev
.parent
= dev
;
356 pdev
->dev
.dma_mask
= dev
->dma_mask
;
357 pdev
->dev
.dma_parms
= dev
->dma_parms
;
358 dma_set_coherent_mask(&pdev
->dev
, dev
->coherent_dma_mask
);
360 ret
= platform_device_add_resources(pdev
, res
, nres
);
364 ret
= platform_device_add_data(pdev
, platdata
, sizeof(*platdata
));
368 ret
= platform_device_add(pdev
);
375 platform_device_put(pdev
);
377 ida_simple_remove(&ci_ida
, id
);
380 EXPORT_SYMBOL_GPL(ci13xxx_add_device
);
382 void ci13xxx_remove_device(struct platform_device
*pdev
)
384 platform_device_unregister(pdev
);
385 ida_simple_remove(&ci_ida
, pdev
->id
);
387 EXPORT_SYMBOL_GPL(ci13xxx_remove_device
);
389 static int __devinit
ci_hdrc_probe(struct platform_device
*pdev
)
391 struct device
*dev
= &pdev
->dev
;
393 struct resource
*res
;
397 if (!dev
->platform_data
) {
398 dev_err(dev
, "platform data missing\n");
402 res
= platform_get_resource(pdev
, IORESOURCE_MEM
, 0);
404 dev_err(dev
, "missing resource\n");
408 base
= devm_request_and_ioremap(dev
, res
);
410 dev_err(dev
, "can't request and ioremap resource\n");
414 ci
= devm_kzalloc(dev
, sizeof(*ci
), GFP_KERNEL
);
416 dev_err(dev
, "can't allocate device\n");
421 ci
->platdata
= dev
->platform_data
;
422 if (ci
->platdata
->phy
)
423 ci
->transceiver
= ci
->platdata
->phy
;
425 ci
->global_phy
= true;
427 ret
= hw_device_init(ci
, base
);
429 dev_err(dev
, "can't initialize hardware\n");
433 ci
->hw_bank
.phys
= res
->start
;
435 ci
->irq
= platform_get_irq(pdev
, 0);
437 dev_err(dev
, "missing IRQ\n");
441 INIT_WORK(&ci
->work
, ci_role_work
);
442 ci
->wq
= create_singlethread_workqueue("ci_otg");
444 dev_err(dev
, "can't create workqueue\n");
448 /* initialize role(s) before the interrupt is requested */
449 ret
= ci_hdrc_host_init(ci
);
451 dev_info(dev
, "doesn't support host\n");
453 ret
= ci_hdrc_gadget_init(ci
);
455 dev_info(dev
, "doesn't support gadget\n");
457 if (!ci
->roles
[CI_ROLE_HOST
] && !ci
->roles
[CI_ROLE_GADGET
]) {
458 dev_err(dev
, "no supported roles\n");
463 if (ci
->roles
[CI_ROLE_HOST
] && ci
->roles
[CI_ROLE_GADGET
]) {
465 ci
->role
= ci_otg_role(ci
);
467 ci
->role
= ci
->roles
[CI_ROLE_HOST
]
472 ret
= ci_role_start(ci
, ci
->role
);
474 dev_err(dev
, "can't start %s role\n", ci_role(ci
)->name
);
479 platform_set_drvdata(pdev
, ci
);
480 ret
= request_irq(ci
->irq
, ci_irq
, IRQF_SHARED
, ci
->platdata
->name
,
485 ret
= device_create_file(dev
, &dev_attr_role
);
490 hw_write(ci
, OP_OTGSC
, OTGSC_IDIE
, OTGSC_IDIE
);
495 device_remove_file(dev
, &dev_attr_role
);
499 flush_workqueue(ci
->wq
);
500 destroy_workqueue(ci
->wq
);
505 static int __devexit
ci_hdrc_remove(struct platform_device
*pdev
)
507 struct ci13xxx
*ci
= platform_get_drvdata(pdev
);
509 flush_workqueue(ci
->wq
);
510 destroy_workqueue(ci
->wq
);
511 device_remove_file(ci
->dev
, &dev_attr_role
);
512 free_irq(ci
->irq
, ci
);
518 static struct platform_driver ci_hdrc_driver
= {
519 .probe
= ci_hdrc_probe
,
520 .remove
= __devexit_p(ci_hdrc_remove
),
526 module_platform_driver(ci_hdrc_driver
);
528 MODULE_ALIAS("platform:ci_hdrc");
529 MODULE_ALIAS("platform:ci13xxx");
530 MODULE_LICENSE("GPL v2");
531 MODULE_AUTHOR("David Lopo <dlopo@chipidea.mips.com>");
532 MODULE_DESCRIPTION("ChipIdea HDRC Driver");