drivers/usb/musb/blackfin.c

   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>
  14 #include <linux/slab.h>
  15 #include <linux/init.h>
  16 #include <linux/list.h>
  17 #include <linux/clk.h>
  18 #include <linux/gpio.h>
  19 #include <linux/io.h>
  20
  21 #include <asm/cacheflush.h>
  22
  23 #include "musb_core.h"
  24 #include "blackfin.h"
  25
  26 /*
  27  * Load an endpoint's FIFO
  28  */
  29 void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
  30 {
  31         void __iomem *fifo = hw_ep->fifo;
  32         void __iomem *epio = hw_ep->regs;
  33
  34         prefetch((u8 *)src);
  35
  36         musb_writew(epio, MUSB_TXCOUNT, len);
  37
  38         DBG(4, "TX ep%d fifo %p count %d buf %p, epio %p\n",
  39                         hw_ep->epnum, fifo, len, src, epio);
  40
  41         dump_fifo_data(src, len);
  42
  43         if (unlikely((unsigned long)src & 0x01))
  44                 outsw_8((unsigned long)fifo, src,
  45                         len & 0x01 ? (len >> 1) + 1 : len >> 1);
  46         else
  47                 outsw((unsigned long)fifo, src,
  48                         len & 0x01 ? (len >> 1) + 1 : len >> 1);
  49 }
  50
  51 /*
  52  * Unload an endpoint's FIFO
  53  */
  54 void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
  55 {
  56         void __iomem *fifo = hw_ep->fifo;
  57         u8 epnum = hw_ep->epnum;
  58         u16 dma_reg = 0;
  59
  60         DBG(4, "%cX ep%d fifo %p count %d buf %p\n",
  61                         'R', hw_ep->epnum, fifo, len, dst);
  62
  63 #ifdef CONFIG_BF52x
  64         invalidate_dcache_range((unsigned int)dst,
  65                 (unsigned int)(dst + len));
  66
  67         /* Setup DMA address register */
  68         dma_reg = (u16) ((u32) dst & 0xFFFF);
  69         bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
  70         SSYNC();
  71
  72         dma_reg = (u16) (((u32) dst >> 16) & 0xFFFF);
  73         bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
  74         SSYNC();
  75
  76         /* Setup DMA count register */
  77         bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
  78         bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
  79         SSYNC();
  80
  81         /* Enable the DMA */
  82         dma_reg = (epnum << 4) | DMA_ENA | INT_ENA;
  83         bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
  84         SSYNC();
  85
  86         /* Wait for compelete */
  87         while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
  88                 cpu_relax();
  89
  90         /* acknowledge dma interrupt */
  91         bfin_write_USB_DMA_INTERRUPT(1 << epnum);
  92         SSYNC();
  93
  94         /* Reset DMA */
  95         bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
  96         SSYNC();
  97 #else
  98         if (unlikely((unsigned long)dst & 0x01))
  99                 insw_8((unsigned long)fifo, dst,
 100                         len & 0x01 ? (len >> 1) + 1 : len >> 1);
 101         else
 102                 insw((unsigned long)fifo, dst,
 103                         len & 0x01 ? (len >> 1) + 1 : len >> 1);
 104 #endif
 105
 106         dump_fifo_data(dst, len);
 107 }
 108
 109 static irqreturn_t blackfin_interrupt(int irq, void *__hci)
 110 {
 111         unsigned long   flags;
 112         irqreturn_t     retval = IRQ_NONE;
 113         struct musb     *musb = __hci;
 114
 115         spin_lock_irqsave(&musb->lock, flags);
 116
 117         musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
 118         musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
 119         musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
 120
 121         if (musb->int_usb || musb->int_tx || musb->int_rx) {
 122                 musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
 123                 musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);
 124                 musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);
 125                 retval = musb_interrupt(musb);
 126         }
 127
 128         spin_unlock_irqrestore(&musb->lock, flags);
 129
 130         /* REVISIT we sometimes get spurious IRQs on g_ep0
 131          * not clear why... fall in BF54x too.
 132          */
 133         if (retval != IRQ_HANDLED)
 134                 DBG(5, "spurious?\n");
 135
 136         return IRQ_HANDLED;
 137 }
 138
 139 static void musb_conn_timer_handler(unsigned long _musb)
 140 {
 141         struct musb *musb = (void *)_musb;
 142         unsigned long flags;
 143         u16 val;
 144
 145         spin_lock_irqsave(&musb->lock, flags);
 146         switch (musb->xceiv->state) {
 147         case OTG_STATE_A_IDLE:
 148         case OTG_STATE_A_WAIT_BCON:
 149                 /* Start a new session */
 150                 val = musb_readw(musb->mregs, MUSB_DEVCTL);
 151                 val |= MUSB_DEVCTL_SESSION;
 152                 musb_writew(musb->mregs, MUSB_DEVCTL, val);
 153
 154                 val = musb_readw(musb->mregs, MUSB_DEVCTL);
 155                 if (!(val & MUSB_DEVCTL_BDEVICE)) {
 156                         gpio_set_value(musb->config->gpio_vrsel, 1);
 157                         musb->xceiv->state = OTG_STATE_A_WAIT_BCON;
 158                 } else {
 159                         gpio_set_value(musb->config->gpio_vrsel, 0);
 160
 161                         /* Ignore VBUSERROR and SUSPEND IRQ */
 162                         val = musb_readb(musb->mregs, MUSB_INTRUSBE);
 163                         val &= ~MUSB_INTR_VBUSERROR;
 164                         musb_writeb(musb->mregs, MUSB_INTRUSBE, val);
 165
 166                         val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR;
 167                         musb_writeb(musb->mregs, MUSB_INTRUSB, val);
 168
 169                         val = MUSB_POWER_HSENAB;
 170                         musb_writeb(musb->mregs, MUSB_POWER, val);
 171                 }
 172                 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 173                 break;
 174
 175         default:
 176                 DBG(1, "%s state not handled\n", otg_state_string(musb));
 177                 break;
 178         }
 179         spin_unlock_irqrestore(&musb->lock, flags);
 180
 181         DBG(4, "state is %s\n", otg_state_string(musb));
 182 }
 183
 184 void musb_platform_enable(struct musb *musb)
 185 {
 186         if (is_host_enabled(musb)) {
 187                 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 188                 musb->a_wait_bcon = TIMER_DELAY;
 189         }
 190 }
 191
 192 void musb_platform_disable(struct musb *musb)
 193 {
 194 }
 195
 196 static void bfin_vbus_power(struct musb *musb, int is_on, int sleeping)
 197 {
 198 }
 199
 200 static void bfin_set_vbus(struct musb *musb, int is_on)
 201 {
 202         if (is_on)
 203                 gpio_set_value(musb->config->gpio_vrsel, 1);
 204         else
 205                 gpio_set_value(musb->config->gpio_vrsel, 0);
 206
 207         DBG(1, "VBUS %s, devctl %02x "
 208                 /* otg %3x conf %08x prcm %08x */ "\n",
 209                 otg_state_string(musb),
 210                 musb_readb(musb->mregs, MUSB_DEVCTL));
 211 }
 212
 213 static int bfin_set_power(struct otg_transceiver *x, unsigned mA)
 214 {
 215         return 0;
 216 }
 217
 218 void musb_platform_try_idle(struct musb *musb, unsigned long timeout)
 219 {
 220         if (is_host_enabled(musb))
 221                 mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
 222 }
 223
 224 int musb_platform_get_vbus_status(struct musb *musb)
 225 {
 226         return 0;
 227 }
 228
 229 void musb_platform_set_mode(struct musb *musb, u8 musb_mode)
 230 {
 231 }
 232
 233 int __init musb_platform_init(struct musb *musb)
 234 {
 235
 236         /*
 237          * Rev 1.0 BF549 EZ-KITs require PE7 to be high for both DEVICE
 238          * and OTG HOST modes, while rev 1.1 and greater require PE7 to
 239          * be low for DEVICE mode and high for HOST mode. We set it high
 240          * here because we are in host mode
 241          */
 242
 243         if (gpio_request(musb->config->gpio_vrsel, "USB_VRSEL")) {
 244                 printk(KERN_ERR "Failed ro request USB_VRSEL GPIO_%d \n",
 245                         musb->config->gpio_vrsel);
 246                 return -ENODEV;
 247         }
 248         gpio_direction_output(musb->config->gpio_vrsel, 0);
 249
 250         usb_nop_xceiv_register();
 251         musb->xceiv = otg_get_transceiver();
 252         if (!musb->xceiv)
 253                 return -ENODEV;
 254
 255         if (ANOMALY_05000346) {
 256                 bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value);
 257                 SSYNC();
 258         }
 259
 260         if (ANOMALY_05000347) {
 261                 bfin_write_USB_APHY_CNTRL(0x0);
 262                 SSYNC();
 263         }
 264
 265         /* TODO
 266          * Set SIC-IVG register
 267          */
 268
 269         /* Configure PLL oscillator register */
 270         bfin_write_USB_PLLOSC_CTRL(0x30a8);
 271         SSYNC();
 272
 273         bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1);
 274         SSYNC();
 275
 276         bfin_write_USB_EP_NI0_RXMAXP(64);
 277         SSYNC();
 278
 279         bfin_write_USB_EP_NI0_TXMAXP(64);
 280         SSYNC();
 281
 282         /* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/
 283         bfin_write_USB_GLOBINTR(0x7);
 284         SSYNC();
 285
 286         bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA | EP1_TX_ENA | EP2_TX_ENA |
 287                                 EP3_TX_ENA | EP4_TX_ENA | EP5_TX_ENA |
 288                                 EP6_TX_ENA | EP7_TX_ENA | EP1_RX_ENA |
 289                                 EP2_RX_ENA | EP3_RX_ENA | EP4_RX_ENA |
 290                                 EP5_RX_ENA | EP6_RX_ENA | EP7_RX_ENA);
 291         SSYNC();
 292
 293         if (is_host_enabled(musb)) {
 294                 musb->board_set_vbus = bfin_set_vbus;
 295                 setup_timer(&musb_conn_timer,
 296                         musb_conn_timer_handler, (unsigned long) musb);
 297         }
 298         if (is_peripheral_enabled(musb))
 299                 musb->xceiv->set_power = bfin_set_power;
 300
 301         musb->isr = blackfin_interrupt;
 302
 303         return 0;
 304 }
 305
 306 int musb_platform_suspend(struct musb *musb)
 307 {
 308         return 0;
 309 }
 310
 311 int musb_platform_resume(struct musb *musb)
 312 {
 313         return 0;
 314 }
 315
 316
 317 int musb_platform_exit(struct musb *musb)
 318 {
 319
 320         bfin_vbus_power(musb, 0 /*off*/, 1);
 321         gpio_free(musb->config->gpio_vrsel);
 322         musb_platform_suspend(musb);
 323
 324         return 0;
 325 }