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git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - drivers/usb/musb/blackfin.c
2 * MUSB OTG controller driver for Blackfin Processors
4 * Copyright 2006-2008 Analog Devices Inc.
6 * Enter bugs at http://blackfin.uclinux.org/
8 * Licensed under the GPL-2 or later.
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/sched.h>
14 #include <linux/slab.h>
15 #include <linux/init.h>
16 #include <linux/list.h>
17 #include <linux/gpio.h>
20 #include <asm/cacheflush.h>
22 #include "musb_core.h"
26 * Load an endpoint's FIFO
28 void musb_write_fifo(struct musb_hw_ep
*hw_ep
, u16 len
, const u8
*src
)
30 void __iomem
*fifo
= hw_ep
->fifo
;
31 void __iomem
*epio
= hw_ep
->regs
;
32 u8 epnum
= hw_ep
->epnum
;
36 musb_writew(epio
, MUSB_TXCOUNT
, len
);
38 DBG(4, "TX ep%d fifo %p count %d buf %p, epio %p\n",
39 hw_ep
->epnum
, fifo
, len
, src
, epio
);
41 dump_fifo_data(src
, len
);
43 if (!ANOMALY_05000380
&& epnum
!= 0) {
46 flush_dcache_range((unsigned long)src
,
47 (unsigned long)(src
+ len
));
49 /* Setup DMA address register */
51 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_ADDR_LOW
), dma_reg
);
54 dma_reg
= (u32
)src
>> 16;
55 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_ADDR_HIGH
), dma_reg
);
58 /* Setup DMA count register */
59 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_COUNT_LOW
), len
);
60 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_COUNT_HIGH
), 0);
64 dma_reg
= (epnum
<< 4) | DMA_ENA
| INT_ENA
| DIRECTION
;
65 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_CTRL
), dma_reg
);
68 /* Wait for compelete */
69 while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum
)))
72 /* acknowledge dma interrupt */
73 bfin_write_USB_DMA_INTERRUPT(1 << epnum
);
77 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_CTRL
), 0);
82 if (unlikely((unsigned long)src
& 0x01))
83 outsw_8((unsigned long)fifo
, src
, (len
+ 1) >> 1);
85 outsw((unsigned long)fifo
, src
, (len
+ 1) >> 1);
89 * Unload an endpoint's FIFO
91 void musb_read_fifo(struct musb_hw_ep
*hw_ep
, u16 len
, u8
*dst
)
93 void __iomem
*fifo
= hw_ep
->fifo
;
94 u8 epnum
= hw_ep
->epnum
;
96 if (ANOMALY_05000467
&& epnum
!= 0) {
99 invalidate_dcache_range((unsigned long)dst
,
100 (unsigned long)(dst
+ len
));
102 /* Setup DMA address register */
104 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_ADDR_LOW
), dma_reg
);
107 dma_reg
= (u32
)dst
>> 16;
108 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_ADDR_HIGH
), dma_reg
);
111 /* Setup DMA count register */
112 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_COUNT_LOW
), len
);
113 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_COUNT_HIGH
), 0);
117 dma_reg
= (epnum
<< 4) | DMA_ENA
| INT_ENA
;
118 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_CTRL
), dma_reg
);
121 /* Wait for compelete */
122 while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum
)))
125 /* acknowledge dma interrupt */
126 bfin_write_USB_DMA_INTERRUPT(1 << epnum
);
130 bfin_write16(USB_DMA_REG(epnum
, USB_DMAx_CTRL
), 0);
134 /* Read the last byte of packet with odd size from address fifo + 4
135 * to trigger 1 byte access to EP0 FIFO.
138 *dst
= (u8
)inw((unsigned long)fifo
+ 4);
140 if (unlikely((unsigned long)dst
& 0x01))
141 insw_8((unsigned long)fifo
, dst
, len
>> 1);
143 insw((unsigned long)fifo
, dst
, len
>> 1);
146 *(dst
+ len
- 1) = (u8
)inw((unsigned long)fifo
+ 4);
149 DBG(4, "%cX ep%d fifo %p count %d buf %p\n",
150 'R', hw_ep
->epnum
, fifo
, len
, dst
);
152 dump_fifo_data(dst
, len
);
155 static irqreturn_t
blackfin_interrupt(int irq
, void *__hci
)
158 irqreturn_t retval
= IRQ_NONE
;
159 struct musb
*musb
= __hci
;
161 spin_lock_irqsave(&musb
->lock
, flags
);
163 musb
->int_usb
= musb_readb(musb
->mregs
, MUSB_INTRUSB
);
164 musb
->int_tx
= musb_readw(musb
->mregs
, MUSB_INTRTX
);
165 musb
->int_rx
= musb_readw(musb
->mregs
, MUSB_INTRRX
);
167 if (musb
->int_usb
|| musb
->int_tx
|| musb
->int_rx
) {
168 musb_writeb(musb
->mregs
, MUSB_INTRUSB
, musb
->int_usb
);
169 musb_writew(musb
->mregs
, MUSB_INTRTX
, musb
->int_tx
);
170 musb_writew(musb
->mregs
, MUSB_INTRRX
, musb
->int_rx
);
171 retval
= musb_interrupt(musb
);
174 spin_unlock_irqrestore(&musb
->lock
, flags
);
176 /* REVISIT we sometimes get spurious IRQs on g_ep0
177 * not clear why... fall in BF54x too.
179 if (retval
!= IRQ_HANDLED
)
180 DBG(5, "spurious?\n");
185 static void musb_conn_timer_handler(unsigned long _musb
)
187 struct musb
*musb
= (void *)_musb
;
191 spin_lock_irqsave(&musb
->lock
, flags
);
192 switch (musb
->xceiv
->state
) {
193 case OTG_STATE_A_IDLE
:
194 case OTG_STATE_A_WAIT_BCON
:
195 /* Start a new session */
196 val
= musb_readw(musb
->mregs
, MUSB_DEVCTL
);
197 val
|= MUSB_DEVCTL_SESSION
;
198 musb_writew(musb
->mregs
, MUSB_DEVCTL
, val
);
200 val
= musb_readw(musb
->mregs
, MUSB_DEVCTL
);
201 if (!(val
& MUSB_DEVCTL_BDEVICE
)) {
202 gpio_set_value(musb
->config
->gpio_vrsel
, 1);
203 musb
->xceiv
->state
= OTG_STATE_A_WAIT_BCON
;
205 gpio_set_value(musb
->config
->gpio_vrsel
, 0);
207 /* Ignore VBUSERROR and SUSPEND IRQ */
208 val
= musb_readb(musb
->mregs
, MUSB_INTRUSBE
);
209 val
&= ~MUSB_INTR_VBUSERROR
;
210 musb_writeb(musb
->mregs
, MUSB_INTRUSBE
, val
);
212 val
= MUSB_INTR_SUSPEND
| MUSB_INTR_VBUSERROR
;
213 musb_writeb(musb
->mregs
, MUSB_INTRUSB
, val
);
215 val
= MUSB_POWER_HSENAB
;
216 musb_writeb(musb
->mregs
, MUSB_POWER
, val
);
218 mod_timer(&musb_conn_timer
, jiffies
+ TIMER_DELAY
);
222 DBG(1, "%s state not handled\n", otg_state_string(musb
));
225 spin_unlock_irqrestore(&musb
->lock
, flags
);
227 DBG(4, "state is %s\n", otg_state_string(musb
));
230 void musb_platform_enable(struct musb
*musb
)
232 if (is_host_enabled(musb
)) {
233 mod_timer(&musb_conn_timer
, jiffies
+ TIMER_DELAY
);
234 musb
->a_wait_bcon
= TIMER_DELAY
;
238 void musb_platform_disable(struct musb
*musb
)
242 static void bfin_vbus_power(struct musb
*musb
, int is_on
, int sleeping
)
246 static void bfin_set_vbus(struct musb
*musb
, int is_on
)
249 gpio_set_value(musb
->config
->gpio_vrsel
, 1);
251 gpio_set_value(musb
->config
->gpio_vrsel
, 0);
253 DBG(1, "VBUS %s, devctl %02x "
254 /* otg %3x conf %08x prcm %08x */ "\n",
255 otg_state_string(musb
),
256 musb_readb(musb
->mregs
, MUSB_DEVCTL
));
259 static int bfin_set_power(struct otg_transceiver
*x
, unsigned mA
)
264 void musb_platform_try_idle(struct musb
*musb
, unsigned long timeout
)
266 if (is_host_enabled(musb
))
267 mod_timer(&musb_conn_timer
, jiffies
+ TIMER_DELAY
);
270 int musb_platform_get_vbus_status(struct musb
*musb
)
275 int musb_platform_set_mode(struct musb
*musb
, u8 musb_mode
)
280 int __init
musb_platform_init(struct musb
*musb
)
284 * Rev 1.0 BF549 EZ-KITs require PE7 to be high for both DEVICE
285 * and OTG HOST modes, while rev 1.1 and greater require PE7 to
286 * be low for DEVICE mode and high for HOST mode. We set it high
287 * here because we are in host mode
290 if (gpio_request(musb
->config
->gpio_vrsel
, "USB_VRSEL")) {
291 printk(KERN_ERR
"Failed ro request USB_VRSEL GPIO_%d \n",
292 musb
->config
->gpio_vrsel
);
295 gpio_direction_output(musb
->config
->gpio_vrsel
, 0);
297 usb_nop_xceiv_register();
298 musb
->xceiv
= otg_get_transceiver();
302 if (ANOMALY_05000346
) {
303 bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value
);
307 if (ANOMALY_05000347
) {
308 bfin_write_USB_APHY_CNTRL(0x0);
312 /* Configure PLL oscillator register */
313 bfin_write_USB_PLLOSC_CTRL(0x30a8);
316 bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1);
319 bfin_write_USB_EP_NI0_RXMAXP(64);
322 bfin_write_USB_EP_NI0_TXMAXP(64);
325 /* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/
326 bfin_write_USB_GLOBINTR(0x7);
329 bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA
| EP1_TX_ENA
| EP2_TX_ENA
|
330 EP3_TX_ENA
| EP4_TX_ENA
| EP5_TX_ENA
|
331 EP6_TX_ENA
| EP7_TX_ENA
| EP1_RX_ENA
|
332 EP2_RX_ENA
| EP3_RX_ENA
| EP4_RX_ENA
|
333 EP5_RX_ENA
| EP6_RX_ENA
| EP7_RX_ENA
);
336 if (is_host_enabled(musb
)) {
337 musb
->board_set_vbus
= bfin_set_vbus
;
338 setup_timer(&musb_conn_timer
,
339 musb_conn_timer_handler
, (unsigned long) musb
);
341 if (is_peripheral_enabled(musb
))
342 musb
->xceiv
->set_power
= bfin_set_power
;
344 musb
->isr
= blackfin_interrupt
;
349 int musb_platform_suspend(struct musb
*musb
)
354 int musb_platform_resume(struct musb
*musb
)
360 int musb_platform_exit(struct musb
*musb
)
363 bfin_vbus_power(musb
, 0 /*off*/, 1);
364 gpio_free(musb
->config
->gpio_vrsel
);
365 musb_platform_suspend(musb
);