p54: Use SKB list handling helpers instead of by-hand code.
[linux-2.6] / drivers / usb / host / ohci-pnx4008.c
1 /*
2  * drivers/usb/host/ohci-pnx4008.c
3  *
4  * driver for Philips PNX4008 USB Host
5  *
6  * Authors: Dmitry Chigirev <source@mvista.com>
7  *          Vitaly Wool <vitalywool@gmail.com>
8  *
9  * register initialization is based on code examples provided by Philips
10  * Copyright (c) 2005 Koninklijke Philips Electronics N.V.
11  *
12  * NOTE: This driver does not have suspend/resume functionality
13  * This driver is intended for engineering development purposes only
14  *
15  * 2005-2006 (c) MontaVista Software, Inc. This file is licensed under
16  * the terms of the GNU General Public License version 2. This program
17  * is licensed "as is" without any warranty of any kind, whether express
18  * or implied.
19  */
20 #include <linux/clk.h>
21 #include <linux/platform_device.h>
22 #include <linux/i2c.h>
23
24 #include <mach/hardware.h>
25 #include <asm/io.h>
26
27 #include <mach/platform.h>
28 #include <mach/irqs.h>
29 #include <mach/gpio.h>
30
31 #define USB_CTRL        IO_ADDRESS(PNX4008_PWRMAN_BASE + 0x64)
32
33 /* USB_CTRL bit defines */
34 #define USB_SLAVE_HCLK_EN       (1 << 24)
35 #define USB_HOST_NEED_CLK_EN    (1 << 21)
36
37 #define USB_OTG_CLK_CTRL        IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF4)
38 #define USB_OTG_CLK_STAT        IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0xFF8)
39
40 /* USB_OTG_CLK_CTRL bit defines */
41 #define AHB_M_CLOCK_ON          (1 << 4)
42 #define OTG_CLOCK_ON            (1 << 3)
43 #define I2C_CLOCK_ON            (1 << 2)
44 #define DEV_CLOCK_ON            (1 << 1)
45 #define HOST_CLOCK_ON           (1 << 0)
46
47 #define USB_OTG_STAT_CONTROL    IO_ADDRESS(PNX4008_USB_CONFIG_BASE + 0x110)
48
49 /* USB_OTG_STAT_CONTROL bit defines */
50 #define TRANSPARENT_I2C_EN      (1 << 7)
51 #define HOST_EN                 (1 << 0)
52
53 /* ISP1301 USB transceiver I2C registers */
54 #define ISP1301_MODE_CONTROL_1          0x04    /* u8 read, set, +1 clear */
55
56 #define MC1_SPEED_REG           (1 << 0)
57 #define MC1_SUSPEND_REG         (1 << 1)
58 #define MC1_DAT_SE0             (1 << 2)
59 #define MC1_TRANSPARENT         (1 << 3)
60 #define MC1_BDIS_ACON_EN        (1 << 4)
61 #define MC1_OE_INT_EN           (1 << 5)
62 #define MC1_UART_EN             (1 << 6)
63 #define MC1_MASK                0x7f
64
65 #define ISP1301_MODE_CONTROL_2          0x12    /* u8 read, set, +1 clear */
66
67 #define MC2_GLOBAL_PWR_DN       (1 << 0)
68 #define MC2_SPD_SUSP_CTRL       (1 << 1)
69 #define MC2_BI_DI               (1 << 2)
70 #define MC2_TRANSP_BDIR0        (1 << 3)
71 #define MC2_TRANSP_BDIR1        (1 << 4)
72 #define MC2_AUDIO_EN            (1 << 5)
73 #define MC2_PSW_EN              (1 << 6)
74 #define MC2_EN2V7               (1 << 7)
75
76 #define ISP1301_OTG_CONTROL_1           0x06    /* u8 read, set, +1 clear */
77 #       define  OTG1_DP_PULLUP          (1 << 0)
78 #       define  OTG1_DM_PULLUP          (1 << 1)
79 #       define  OTG1_DP_PULLDOWN        (1 << 2)
80 #       define  OTG1_DM_PULLDOWN        (1 << 3)
81 #       define  OTG1_ID_PULLDOWN        (1 << 4)
82 #       define  OTG1_VBUS_DRV           (1 << 5)
83 #       define  OTG1_VBUS_DISCHRG       (1 << 6)
84 #       define  OTG1_VBUS_CHRG          (1 << 7)
85 #define ISP1301_OTG_STATUS              0x10    /* u8 readonly */
86 #       define  OTG_B_SESS_END          (1 << 6)
87 #       define  OTG_B_SESS_VLD          (1 << 7)
88
89 #define ISP1301_I2C_ADDR 0x2C
90
91 #define ISP1301_I2C_MODE_CONTROL_1 0x4
92 #define ISP1301_I2C_MODE_CONTROL_2 0x12
93 #define ISP1301_I2C_OTG_CONTROL_1 0x6
94 #define ISP1301_I2C_OTG_CONTROL_2 0x10
95 #define ISP1301_I2C_INTERRUPT_SOURCE 0x8
96 #define ISP1301_I2C_INTERRUPT_LATCH 0xA
97 #define ISP1301_I2C_INTERRUPT_FALLING 0xC
98 #define ISP1301_I2C_INTERRUPT_RISING 0xE
99 #define ISP1301_I2C_REG_CLEAR_ADDR 1
100
101 struct i2c_driver isp1301_driver;
102 struct i2c_client *isp1301_i2c_client;
103
104 extern int usb_disabled(void);
105 extern int ocpi_enable(void);
106
107 static struct clk *usb_clk;
108
109 static const unsigned short normal_i2c[] =
110     { ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END };
111
112 static int isp1301_probe(struct i2c_client *client,
113                          const struct i2c_device_id *id)
114 {
115         return 0;
116 }
117
118 static int isp1301_remove(struct i2c_client *client)
119 {
120         return 0;
121 }
122
123 const struct i2c_device_id isp1301_id[] = {
124         { "isp1301_pnx", 0 },
125         { }
126 };
127
128 struct i2c_driver isp1301_driver = {
129         .driver = {
130                 .name = "isp1301_pnx",
131         },
132         .probe = isp1301_probe,
133         .remove = isp1301_remove,
134         .id_table = isp1301_id,
135 };
136
137 static void i2c_write(u8 buf, u8 subaddr)
138 {
139         char tmpbuf[2];
140
141         tmpbuf[0] = subaddr;    /*register number */
142         tmpbuf[1] = buf;        /*register data */
143         i2c_master_send(isp1301_i2c_client, &tmpbuf[0], 2);
144 }
145
146 static void isp1301_configure(void)
147 {
148         /* PNX4008 only supports DAT_SE0 USB mode */
149         /* PNX4008 R2A requires setting the MAX603 to output 3.6V */
150         /* Power up externel charge-pump */
151
152         i2c_write(MC1_DAT_SE0 | MC1_SPEED_REG, ISP1301_I2C_MODE_CONTROL_1);
153         i2c_write(~(MC1_DAT_SE0 | MC1_SPEED_REG),
154                   ISP1301_I2C_MODE_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
155         i2c_write(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL,
156                   ISP1301_I2C_MODE_CONTROL_2);
157         i2c_write(~(MC2_BI_DI | MC2_PSW_EN | MC2_SPD_SUSP_CTRL),
158                   ISP1301_I2C_MODE_CONTROL_2 | ISP1301_I2C_REG_CLEAR_ADDR);
159         i2c_write(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN,
160                   ISP1301_I2C_OTG_CONTROL_1);
161         i2c_write(~(OTG1_DM_PULLDOWN | OTG1_DP_PULLDOWN),
162                   ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
163         i2c_write(0xFF,
164                   ISP1301_I2C_INTERRUPT_LATCH | ISP1301_I2C_REG_CLEAR_ADDR);
165         i2c_write(0xFF,
166                   ISP1301_I2C_INTERRUPT_FALLING | ISP1301_I2C_REG_CLEAR_ADDR);
167         i2c_write(0xFF,
168                   ISP1301_I2C_INTERRUPT_RISING | ISP1301_I2C_REG_CLEAR_ADDR);
169
170 }
171
172 static inline void isp1301_vbus_on(void)
173 {
174         i2c_write(OTG1_VBUS_DRV, ISP1301_I2C_OTG_CONTROL_1);
175 }
176
177 static inline void isp1301_vbus_off(void)
178 {
179         i2c_write(OTG1_VBUS_DRV,
180                   ISP1301_I2C_OTG_CONTROL_1 | ISP1301_I2C_REG_CLEAR_ADDR);
181 }
182
183 static void pnx4008_start_hc(void)
184 {
185         unsigned long tmp = __raw_readl(USB_OTG_STAT_CONTROL) | HOST_EN;
186         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
187         isp1301_vbus_on();
188 }
189
190 static void pnx4008_stop_hc(void)
191 {
192         unsigned long tmp;
193         isp1301_vbus_off();
194         tmp = __raw_readl(USB_OTG_STAT_CONTROL) & ~HOST_EN;
195         __raw_writel(tmp, USB_OTG_STAT_CONTROL);
196 }
197
198 static int __devinit ohci_pnx4008_start(struct usb_hcd *hcd)
199 {
200         struct ohci_hcd *ohci = hcd_to_ohci(hcd);
201         int ret;
202
203         if ((ret = ohci_init(ohci)) < 0)
204                 return ret;
205
206         if ((ret = ohci_run(ohci)) < 0) {
207                 dev_err(hcd->self.controller, "can't start\n");
208                 ohci_stop(hcd);
209                 return ret;
210         }
211         return 0;
212 }
213
214 static const struct hc_driver ohci_pnx4008_hc_driver = {
215         .description = hcd_name,
216         .product_desc =         "pnx4008 OHCI",
217
218         /*
219          * generic hardware linkage
220          */
221         .irq = ohci_irq,
222         .flags = HCD_USB11 | HCD_MEMORY,
223
224         .hcd_priv_size =        sizeof(struct ohci_hcd),
225         /*
226          * basic lifecycle operations
227          */
228         .start = ohci_pnx4008_start,
229         .stop = ohci_stop,
230         .shutdown = ohci_shutdown,
231
232         /*
233          * managing i/o requests and associated device resources
234          */
235         .urb_enqueue = ohci_urb_enqueue,
236         .urb_dequeue = ohci_urb_dequeue,
237         .endpoint_disable = ohci_endpoint_disable,
238
239         /*
240          * scheduling support
241          */
242         .get_frame_number = ohci_get_frame,
243
244         /*
245          * root hub support
246          */
247         .hub_status_data = ohci_hub_status_data,
248         .hub_control = ohci_hub_control,
249 #ifdef  CONFIG_PM
250         .bus_suspend = ohci_bus_suspend,
251         .bus_resume = ohci_bus_resume,
252 #endif
253         .start_port_reset = ohci_start_port_reset,
254 };
255
256 #define USB_CLOCK_MASK (AHB_M_CLOCK_ON| OTG_CLOCK_ON | HOST_CLOCK_ON | I2C_CLOCK_ON)
257
258 static void pnx4008_set_usb_bits(void)
259 {
260         start_int_set_falling_edge(SE_USB_OTG_ATX_INT_N);
261         start_int_ack(SE_USB_OTG_ATX_INT_N);
262         start_int_umask(SE_USB_OTG_ATX_INT_N);
263
264         start_int_set_rising_edge(SE_USB_OTG_TIMER_INT);
265         start_int_ack(SE_USB_OTG_TIMER_INT);
266         start_int_umask(SE_USB_OTG_TIMER_INT);
267
268         start_int_set_rising_edge(SE_USB_I2C_INT);
269         start_int_ack(SE_USB_I2C_INT);
270         start_int_umask(SE_USB_I2C_INT);
271
272         start_int_set_rising_edge(SE_USB_INT);
273         start_int_ack(SE_USB_INT);
274         start_int_umask(SE_USB_INT);
275
276         start_int_set_rising_edge(SE_USB_NEED_CLK_INT);
277         start_int_ack(SE_USB_NEED_CLK_INT);
278         start_int_umask(SE_USB_NEED_CLK_INT);
279
280         start_int_set_rising_edge(SE_USB_AHB_NEED_CLK_INT);
281         start_int_ack(SE_USB_AHB_NEED_CLK_INT);
282         start_int_umask(SE_USB_AHB_NEED_CLK_INT);
283 }
284
285 static void pnx4008_unset_usb_bits(void)
286 {
287         start_int_mask(SE_USB_OTG_ATX_INT_N);
288         start_int_mask(SE_USB_OTG_TIMER_INT);
289         start_int_mask(SE_USB_I2C_INT);
290         start_int_mask(SE_USB_INT);
291         start_int_mask(SE_USB_NEED_CLK_INT);
292         start_int_mask(SE_USB_AHB_NEED_CLK_INT);
293 }
294
295 static int __devinit usb_hcd_pnx4008_probe(struct platform_device *pdev)
296 {
297         struct usb_hcd *hcd = 0;
298         struct ohci_hcd *ohci;
299         const struct hc_driver *driver = &ohci_pnx4008_hc_driver;
300         struct i2c_adapter *i2c_adap;
301         struct i2c_board_info i2c_info;
302
303         int ret = 0, irq;
304
305         dev_dbg(&pdev->dev, "%s: " DRIVER_DESC " (pnx4008)\n", hcd_name);
306         if (usb_disabled()) {
307                 err("USB is disabled");
308                 ret = -ENODEV;
309                 goto out;
310         }
311
312         if (pdev->num_resources != 2
313             || pdev->resource[0].flags != IORESOURCE_MEM
314             || pdev->resource[1].flags != IORESOURCE_IRQ) {
315                 err("Invalid resource configuration");
316                 ret = -ENODEV;
317                 goto out;
318         }
319
320         /* Enable AHB slave USB clock, needed for further USB clock control */
321         __raw_writel(USB_SLAVE_HCLK_EN | (1 << 19), USB_CTRL);
322
323         ret = i2c_add_driver(&isp1301_driver);
324         if (ret < 0) {
325                 err("failed to add ISP1301 driver");
326                 goto out;
327         }
328         i2c_adap = i2c_get_adapter(2);
329         memset(&i2c_info, 0, sizeof(struct i2c_board_info));
330         strlcpy(i2c_info.name, "isp1301_pnx", I2C_NAME_SIZE);
331         isp1301_i2c_client = i2c_new_probed_device(i2c_adap, &i2c_info,
332                                                    normal_i2c);
333         i2c_put_adapter(i2c_adap);
334         if (!isp1301_i2c_client) {
335                 err("failed to connect I2C to ISP1301 USB Transceiver");
336                 ret = -ENODEV;
337                 goto out_i2c_driver;
338         }
339
340         isp1301_configure();
341
342         /* Enable USB PLL */
343         usb_clk = clk_get(&pdev->dev, "ck_pll5");
344         if (IS_ERR(usb_clk)) {
345                 err("failed to acquire USB PLL");
346                 ret = PTR_ERR(usb_clk);
347                 goto out1;
348         }
349
350         ret = clk_enable(usb_clk);
351         if (ret < 0) {
352                 err("failed to start USB PLL");
353                 goto out2;
354         }
355
356         ret = clk_set_rate(usb_clk, 48000);
357         if (ret < 0) {
358                 err("failed to set USB clock rate");
359                 goto out3;
360         }
361
362         __raw_writel(__raw_readl(USB_CTRL) | USB_HOST_NEED_CLK_EN, USB_CTRL);
363
364         /* Set to enable all needed USB clocks */
365         __raw_writel(USB_CLOCK_MASK, USB_OTG_CLK_CTRL);
366
367         while ((__raw_readl(USB_OTG_CLK_STAT) & USB_CLOCK_MASK) !=
368                USB_CLOCK_MASK) ;
369
370         hcd = usb_create_hcd (driver, &pdev->dev, dev_name(&pdev->dev));
371         if (!hcd) {
372                 err("Failed to allocate HC buffer");
373                 ret = -ENOMEM;
374                 goto out3;
375         }
376
377         /* Set all USB bits in the Start Enable register */
378         pnx4008_set_usb_bits();
379
380         hcd->rsrc_start = pdev->resource[0].start;
381         hcd->rsrc_len = pdev->resource[0].end - pdev->resource[0].start + 1;
382         if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
383                 dev_dbg(&pdev->dev, "request_mem_region failed\n");
384                 ret =  -ENOMEM;
385                 goto out4;
386         }
387         hcd->regs = (void __iomem *)pdev->resource[0].start;
388
389         irq = platform_get_irq(pdev, 0);
390         if (irq < 0) {
391                 ret = -ENXIO;
392                 goto out4;
393         }
394
395         pnx4008_start_hc();
396         platform_set_drvdata(pdev, hcd);
397         ohci = hcd_to_ohci(hcd);
398         ohci_hcd_init(ohci);
399
400         dev_info(&pdev->dev, "at 0x%p, irq %d\n", hcd->regs, hcd->irq);
401         ret = usb_add_hcd(hcd, irq, IRQF_DISABLED);
402         if (ret == 0)
403                 return ret;
404
405         pnx4008_stop_hc();
406 out4:
407         pnx4008_unset_usb_bits();
408         usb_put_hcd(hcd);
409 out3:
410         clk_disable(usb_clk);
411 out2:
412         clk_put(usb_clk);
413 out1:
414         i2c_unregister_client(isp1301_i2c_client);
415         isp1301_i2c_client = NULL;
416 out_i2c_driver:
417         i2c_del_driver(&isp1301_driver);
418 out:
419         return ret;
420 }
421
422 static int usb_hcd_pnx4008_remove(struct platform_device *pdev)
423 {
424         struct usb_hcd *hcd = platform_get_drvdata(pdev);
425
426         usb_remove_hcd(hcd);
427         pnx4008_stop_hc();
428         release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
429         usb_put_hcd(hcd);
430         pnx4008_unset_usb_bits();
431         clk_disable(usb_clk);
432         clk_put(usb_clk);
433         i2c_unregister_client(isp1301_i2c_client);
434         isp1301_i2c_client = NULL;
435         i2c_del_driver(&isp1301_driver);
436
437         platform_set_drvdata(pdev, NULL);
438
439         return 0;
440 }
441
442 /* work with hotplug and coldplug */
443 MODULE_ALIAS("platform:usb-ohci");
444
445 static struct platform_driver usb_hcd_pnx4008_driver = {
446         .driver = {
447                 .name = "usb-ohci",
448                 .owner  = THIS_MODULE,
449         },
450         .probe = usb_hcd_pnx4008_probe,
451         .remove = usb_hcd_pnx4008_remove,
452 };
453