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0c6a8818 BW |
1 | /* |
2 | * MUSB OTG controller driver for Blackfin Processors | |
3 | * | |
4 | * Copyright 2006-2008 Analog Devices Inc. | |
5 | * | |
6 | * Enter bugs at http://blackfin.uclinux.org/ | |
7 | * | |
8 | * Licensed under the GPL-2 or later. | |
9 | */ | |
10 | ||
11 | #include <linux/module.h> | |
12 | #include <linux/kernel.h> | |
13 | #include <linux/sched.h> | |
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14 | #include <linux/init.h> |
15 | #include <linux/list.h> | |
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16 | #include <linux/gpio.h> |
17 | #include <linux/io.h> | |
18 | ||
19 | #include <asm/cacheflush.h> | |
20 | ||
21 | #include "musb_core.h" | |
22 | #include "blackfin.h" | |
23 | ||
24 | /* | |
25 | * Load an endpoint's FIFO | |
26 | */ | |
27 | void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src) | |
28 | { | |
29 | void __iomem *fifo = hw_ep->fifo; | |
30 | void __iomem *epio = hw_ep->regs; | |
1c4bdc01 | 31 | u8 epnum = hw_ep->epnum; |
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32 | |
33 | prefetch((u8 *)src); | |
34 | ||
35 | musb_writew(epio, MUSB_TXCOUNT, len); | |
36 | ||
37 | DBG(4, "TX ep%d fifo %p count %d buf %p, epio %p\n", | |
38 | hw_ep->epnum, fifo, len, src, epio); | |
39 | ||
40 | dump_fifo_data(src, len); | |
41 | ||
1c4bdc01 | 42 | if (!ANOMALY_05000380 && epnum != 0) { |
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43 | u16 dma_reg; |
44 | ||
45 | flush_dcache_range((unsigned long)src, | |
46 | (unsigned long)(src + len)); | |
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47 | |
48 | /* Setup DMA address register */ | |
1ca9e9ca | 49 | dma_reg = (u32)src; |
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50 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg); |
51 | SSYNC(); | |
52 | ||
1ca9e9ca | 53 | dma_reg = (u32)src >> 16; |
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54 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg); |
55 | SSYNC(); | |
56 | ||
57 | /* Setup DMA count register */ | |
58 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len); | |
59 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0); | |
60 | SSYNC(); | |
61 | ||
62 | /* Enable the DMA */ | |
63 | dma_reg = (epnum << 4) | DMA_ENA | INT_ENA | DIRECTION; | |
64 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg); | |
65 | SSYNC(); | |
66 | ||
67 | /* Wait for compelete */ | |
68 | while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum))) | |
69 | cpu_relax(); | |
70 | ||
71 | /* acknowledge dma interrupt */ | |
72 | bfin_write_USB_DMA_INTERRUPT(1 << epnum); | |
73 | SSYNC(); | |
74 | ||
75 | /* Reset DMA */ | |
76 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0); | |
77 | SSYNC(); | |
78 | } else { | |
79 | SSYNC(); | |
80 | ||
81 | if (unlikely((unsigned long)src & 0x01)) | |
1ca9e9ca | 82 | outsw_8((unsigned long)fifo, src, (len + 1) >> 1); |
1c4bdc01 | 83 | else |
1ca9e9ca | 84 | outsw((unsigned long)fifo, src, (len + 1) >> 1); |
1c4bdc01 | 85 | } |
0c6a8818 | 86 | } |
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87 | /* |
88 | * Unload an endpoint's FIFO | |
89 | */ | |
90 | void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) | |
91 | { | |
92 | void __iomem *fifo = hw_ep->fifo; | |
93 | u8 epnum = hw_ep->epnum; | |
0c6a8818 | 94 | |
1c4bdc01 | 95 | if (ANOMALY_05000467 && epnum != 0) { |
1ca9e9ca | 96 | u16 dma_reg; |
1c4bdc01 | 97 | |
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98 | invalidate_dcache_range((unsigned long)dst, |
99 | (unsigned long)(dst + len)); | |
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100 | |
101 | /* Setup DMA address register */ | |
1ca9e9ca | 102 | dma_reg = (u32)dst; |
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103 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg); |
104 | SSYNC(); | |
105 | ||
1ca9e9ca | 106 | dma_reg = (u32)dst >> 16; |
1c4bdc01 BW |
107 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg); |
108 | SSYNC(); | |
109 | ||
110 | /* Setup DMA count register */ | |
111 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len); | |
112 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0); | |
113 | SSYNC(); | |
114 | ||
115 | /* Enable the DMA */ | |
116 | dma_reg = (epnum << 4) | DMA_ENA | INT_ENA; | |
117 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg); | |
118 | SSYNC(); | |
119 | ||
120 | /* Wait for compelete */ | |
121 | while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum))) | |
122 | cpu_relax(); | |
123 | ||
124 | /* acknowledge dma interrupt */ | |
125 | bfin_write_USB_DMA_INTERRUPT(1 << epnum); | |
126 | SSYNC(); | |
127 | ||
128 | /* Reset DMA */ | |
129 | bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0); | |
130 | SSYNC(); | |
131 | } else { | |
132 | SSYNC(); | |
133 | /* Read the last byte of packet with odd size from address fifo + 4 | |
134 | * to trigger 1 byte access to EP0 FIFO. | |
135 | */ | |
136 | if (len == 1) | |
137 | *dst = (u8)inw((unsigned long)fifo + 4); | |
138 | else { | |
139 | if (unlikely((unsigned long)dst & 0x01)) | |
140 | insw_8((unsigned long)fifo, dst, len >> 1); | |
141 | else | |
142 | insw((unsigned long)fifo, dst, len >> 1); | |
143 | ||
144 | if (len & 0x01) | |
145 | *(dst + len - 1) = (u8)inw((unsigned long)fifo + 4); | |
146 | } | |
147 | } | |
04f4086f MF |
148 | DBG(4, "%cX ep%d fifo %p count %d buf %p\n", |
149 | 'R', hw_ep->epnum, fifo, len, dst); | |
150 | ||
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151 | dump_fifo_data(dst, len); |
152 | } | |
153 | ||
154 | static irqreturn_t blackfin_interrupt(int irq, void *__hci) | |
155 | { | |
156 | unsigned long flags; | |
157 | irqreturn_t retval = IRQ_NONE; | |
158 | struct musb *musb = __hci; | |
159 | ||
160 | spin_lock_irqsave(&musb->lock, flags); | |
161 | ||
162 | musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); | |
163 | musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX); | |
164 | musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX); | |
165 | ||
166 | if (musb->int_usb || musb->int_tx || musb->int_rx) { | |
167 | musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb); | |
168 | musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx); | |
169 | musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx); | |
170 | retval = musb_interrupt(musb); | |
171 | } | |
172 | ||
173 | spin_unlock_irqrestore(&musb->lock, flags); | |
174 | ||
2f831751 | 175 | return retval; |
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176 | } |
177 | ||
178 | static void musb_conn_timer_handler(unsigned long _musb) | |
179 | { | |
180 | struct musb *musb = (void *)_musb; | |
181 | unsigned long flags; | |
182 | u16 val; | |
183 | ||
184 | spin_lock_irqsave(&musb->lock, flags); | |
84e250ff | 185 | switch (musb->xceiv->state) { |
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186 | case OTG_STATE_A_IDLE: |
187 | case OTG_STATE_A_WAIT_BCON: | |
188 | /* Start a new session */ | |
189 | val = musb_readw(musb->mregs, MUSB_DEVCTL); | |
190 | val |= MUSB_DEVCTL_SESSION; | |
191 | musb_writew(musb->mregs, MUSB_DEVCTL, val); | |
192 | ||
193 | val = musb_readw(musb->mregs, MUSB_DEVCTL); | |
194 | if (!(val & MUSB_DEVCTL_BDEVICE)) { | |
195 | gpio_set_value(musb->config->gpio_vrsel, 1); | |
84e250ff | 196 | musb->xceiv->state = OTG_STATE_A_WAIT_BCON; |
0c6a8818 BW |
197 | } else { |
198 | gpio_set_value(musb->config->gpio_vrsel, 0); | |
199 | ||
200 | /* Ignore VBUSERROR and SUSPEND IRQ */ | |
201 | val = musb_readb(musb->mregs, MUSB_INTRUSBE); | |
202 | val &= ~MUSB_INTR_VBUSERROR; | |
203 | musb_writeb(musb->mregs, MUSB_INTRUSBE, val); | |
204 | ||
205 | val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR; | |
206 | musb_writeb(musb->mregs, MUSB_INTRUSB, val); | |
207 | ||
208 | val = MUSB_POWER_HSENAB; | |
209 | musb_writeb(musb->mregs, MUSB_POWER, val); | |
210 | } | |
211 | mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY); | |
212 | break; | |
213 | ||
214 | default: | |
215 | DBG(1, "%s state not handled\n", otg_state_string(musb)); | |
216 | break; | |
217 | } | |
218 | spin_unlock_irqrestore(&musb->lock, flags); | |
219 | ||
220 | DBG(4, "state is %s\n", otg_state_string(musb)); | |
221 | } | |
222 | ||
223 | void musb_platform_enable(struct musb *musb) | |
224 | { | |
225 | if (is_host_enabled(musb)) { | |
226 | mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY); | |
227 | musb->a_wait_bcon = TIMER_DELAY; | |
228 | } | |
229 | } | |
230 | ||
231 | void musb_platform_disable(struct musb *musb) | |
232 | { | |
233 | } | |
234 | ||
235 | static void bfin_vbus_power(struct musb *musb, int is_on, int sleeping) | |
236 | { | |
237 | } | |
238 | ||
239 | static void bfin_set_vbus(struct musb *musb, int is_on) | |
240 | { | |
6ddc6dae CC |
241 | int value = musb->config->gpio_vrsel_active; |
242 | if (!is_on) | |
243 | value = !value; | |
244 | gpio_set_value(musb->config->gpio_vrsel, value); | |
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245 | |
246 | DBG(1, "VBUS %s, devctl %02x " | |
247 | /* otg %3x conf %08x prcm %08x */ "\n", | |
248 | otg_state_string(musb), | |
249 | musb_readb(musb->mregs, MUSB_DEVCTL)); | |
250 | } | |
251 | ||
252 | static int bfin_set_power(struct otg_transceiver *x, unsigned mA) | |
253 | { | |
254 | return 0; | |
255 | } | |
256 | ||
257 | void musb_platform_try_idle(struct musb *musb, unsigned long timeout) | |
258 | { | |
259 | if (is_host_enabled(musb)) | |
260 | mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY); | |
261 | } | |
262 | ||
263 | int musb_platform_get_vbus_status(struct musb *musb) | |
264 | { | |
265 | return 0; | |
266 | } | |
267 | ||
2002e768 | 268 | int musb_platform_set_mode(struct musb *musb, u8 musb_mode) |
0c6a8818 | 269 | { |
2002e768 | 270 | return -EIO; |
0c6a8818 BW |
271 | } |
272 | ||
de2e1b0c | 273 | int __init musb_platform_init(struct musb *musb, void *board_data) |
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274 | { |
275 | ||
276 | /* | |
277 | * Rev 1.0 BF549 EZ-KITs require PE7 to be high for both DEVICE | |
278 | * and OTG HOST modes, while rev 1.1 and greater require PE7 to | |
279 | * be low for DEVICE mode and high for HOST mode. We set it high | |
280 | * here because we are in host mode | |
281 | */ | |
282 | ||
283 | if (gpio_request(musb->config->gpio_vrsel, "USB_VRSEL")) { | |
284 | printk(KERN_ERR "Failed ro request USB_VRSEL GPIO_%d \n", | |
285 | musb->config->gpio_vrsel); | |
286 | return -ENODEV; | |
287 | } | |
288 | gpio_direction_output(musb->config->gpio_vrsel, 0); | |
289 | ||
84e250ff DB |
290 | usb_nop_xceiv_register(); |
291 | musb->xceiv = otg_get_transceiver(); | |
292 | if (!musb->xceiv) | |
293 | return -ENODEV; | |
294 | ||
d426e60d RG |
295 | if (ANOMALY_05000346) { |
296 | bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value); | |
297 | SSYNC(); | |
298 | } | |
0c6a8818 | 299 | |
d426e60d RG |
300 | if (ANOMALY_05000347) { |
301 | bfin_write_USB_APHY_CNTRL(0x0); | |
302 | SSYNC(); | |
303 | } | |
0c6a8818 | 304 | |
0c6a8818 BW |
305 | /* Configure PLL oscillator register */ |
306 | bfin_write_USB_PLLOSC_CTRL(0x30a8); | |
307 | SSYNC(); | |
308 | ||
309 | bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1); | |
310 | SSYNC(); | |
311 | ||
312 | bfin_write_USB_EP_NI0_RXMAXP(64); | |
313 | SSYNC(); | |
314 | ||
315 | bfin_write_USB_EP_NI0_TXMAXP(64); | |
316 | SSYNC(); | |
317 | ||
318 | /* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/ | |
319 | bfin_write_USB_GLOBINTR(0x7); | |
320 | SSYNC(); | |
321 | ||
322 | bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA | EP1_TX_ENA | EP2_TX_ENA | | |
323 | EP3_TX_ENA | EP4_TX_ENA | EP5_TX_ENA | | |
324 | EP6_TX_ENA | EP7_TX_ENA | EP1_RX_ENA | | |
325 | EP2_RX_ENA | EP3_RX_ENA | EP4_RX_ENA | | |
326 | EP5_RX_ENA | EP6_RX_ENA | EP7_RX_ENA); | |
327 | SSYNC(); | |
328 | ||
329 | if (is_host_enabled(musb)) { | |
330 | musb->board_set_vbus = bfin_set_vbus; | |
331 | setup_timer(&musb_conn_timer, | |
332 | musb_conn_timer_handler, (unsigned long) musb); | |
333 | } | |
334 | if (is_peripheral_enabled(musb)) | |
84e250ff | 335 | musb->xceiv->set_power = bfin_set_power; |
0c6a8818 BW |
336 | |
337 | musb->isr = blackfin_interrupt; | |
338 | ||
339 | return 0; | |
340 | } | |
341 | ||
342 | int musb_platform_suspend(struct musb *musb) | |
343 | { | |
344 | return 0; | |
345 | } | |
346 | ||
347 | int musb_platform_resume(struct musb *musb) | |
348 | { | |
349 | return 0; | |
350 | } | |
351 | ||
352 | ||
353 | int musb_platform_exit(struct musb *musb) | |
354 | { | |
355 | ||
356 | bfin_vbus_power(musb, 0 /*off*/, 1); | |
357 | gpio_free(musb->config->gpio_vrsel); | |
358 | musb_platform_suspend(musb); | |
359 | ||
360 | return 0; | |
361 | } |