drivers/usb/musb/blackfin_usb.c

   1 /*
   2  * Blackfin MUSB HCD (Host Controller Driver) for u-boot
   3  *
   4  * Copyright (c) 2008-2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2 or later.
   7  */
   8
   9 #include <common.h>
  10
  11 #include <usb.h>
  12
  13 #include <asm/blackfin.h>
  14 #include <asm/mach-common/bits/usb.h>
  15
  16 #include "musb_core.h"
  17
  18 #ifndef CONFIG_USB_BLACKFIN_CLKIN
  19 #define CONFIG_USB_BLACKFIN_CLKIN 24
  20 #endif
  21
  22 /* MUSB platform configuration */
  23 struct musb_config musb_cfg = {
  24         .regs       = (struct musb_regs *)USB_FADDR,
  25         .timeout    = 0x3FFFFFF,
  26         .musb_speed = 0,
  27 };
  28
  29 /*
  30  * This function read or write data to endpoint fifo
  31  * Blackfin use DMA polling method to avoid buffer alignment issues
  32  *
  33  * ep           - Endpoint number
  34  * length       - Number of bytes to write to FIFO
  35  * fifo_data    - Pointer to data buffer to be read/write
  36  * is_write     - Flag for read or write
  37  */
  38 void rw_fifo(u8 ep, u32 length, void *fifo_data, int is_write)
  39 {
  40         struct bfin_musb_dma_regs *regs;
  41         u32 val = (u32)fifo_data;
  42
  43         blackfin_dcache_flush_invalidate_range(fifo_data, fifo_data + length);
  44
  45         regs = (void *)USB_DMA_INTERRUPT;
  46         regs += ep;
  47
  48         /* Setup DMA address register */
  49         bfin_write16(&regs->addr_low, val);
  50         SSYNC();
  51
  52         bfin_write16(&regs->addr_high, val >> 16);
  53         SSYNC();
  54
  55         /* Setup DMA count register */
  56         bfin_write16(&regs->count_low, length);
  57         bfin_write16(&regs->count_high, 0);
  58         SSYNC();
  59
  60         /* Enable the DMA */
  61         val = (ep << 4) | DMA_ENA | INT_ENA;
  62         if (is_write)
  63                 val |= DIRECTION;
  64         bfin_write16(&regs->control, val);
  65         SSYNC();
  66
  67         /* Wait for compelete */
  68         while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << ep)))
  69                 continue;
  70
  71         /* acknowledge dma interrupt */
  72         bfin_write_USB_DMA_INTERRUPT(1 << ep);
  73         SSYNC();
  74
  75         /* Reset DMA */
  76         bfin_write16(&regs->control, 0);
  77         SSYNC();
  78 }
  79
  80 void write_fifo(u8 ep, u32 length, void *fifo_data)
  81 {
  82         rw_fifo(ep, length, fifo_data, 1);
  83 }
  84
  85 void read_fifo(u8 ep, u32 length, void *fifo_data)
  86 {
  87         rw_fifo(ep, length, fifo_data, 0);
  88 }
  89
  90
  91 /*
  92  * CPU and board-specific MUSB initializations.  Aliased function
  93  * signals caller to move on.
  94  */
  95 static void __def_musb_init(void)
  96 {
  97 }
  98 void board_musb_init(void) __attribute__((weak, alias("__def_musb_init")));
  99
 100 static void bfin_anomaly_init(void)
 101 {
 102         u32 revid;
 103
 104         if (!ANOMALY_05000346 && !ANOMALY_05000347)
 105                 return;
 106
 107         revid = bfin_revid();
 108
 109 #ifdef __ADSPBF54x__
 110         if (revid > 0)
 111                 return;
 112 #endif
 113 #ifdef __ADSPBF52x__
 114         if (ANOMALY_BF526 && revid > 0)
 115                 return;
 116         if (ANOMALY_BF527 && revid > 1)
 117                 return;
 118 #endif
 119
 120         if (ANOMALY_05000346) {
 121                 bfin_write_USB_APHY_CALIB(ANOMALY_05000346_value);
 122                 SSYNC();
 123         }
 124
 125         if (ANOMALY_05000347) {
 126                 bfin_write_USB_APHY_CNTRL(0x0);
 127                 SSYNC();
 128         }
 129 }
 130
 131 int musb_platform_init(void)
 132 {
 133         /* board specific initialization */
 134         board_musb_init();
 135
 136         bfin_anomaly_init();
 137
 138         /* Configure PLL oscillator register */
 139         bfin_write_USB_PLLOSC_CTRL(0x3080 |
 140                 ((480 / CONFIG_USB_BLACKFIN_CLKIN) << 1));
 141         SSYNC();
 142
 143         bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1);
 144         SSYNC();
 145
 146         bfin_write_USB_EP_NI0_RXMAXP(64);
 147         SSYNC();
 148
 149         bfin_write_USB_EP_NI0_TXMAXP(64);
 150         SSYNC();
 151
 152         /* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/
 153         bfin_write_USB_GLOBINTR(0x7);
 154         SSYNC();
 155
 156         bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA | EP1_TX_ENA | EP2_TX_ENA |
 157                                 EP3_TX_ENA | EP4_TX_ENA | EP5_TX_ENA |
 158                                 EP6_TX_ENA | EP7_TX_ENA | EP1_RX_ENA |
 159                                 EP2_RX_ENA | EP3_RX_ENA | EP4_RX_ENA |
 160                                 EP5_RX_ENA | EP6_RX_ENA | EP7_RX_ENA);
 161         SSYNC();
 162
 163         return 0;
 164 }
 165
 166 /*
 167  * This function performs Blackfin platform specific deinitialization for usb.
 168 */
 169 void musb_platform_deinit(void)
 170 {
 171 }