LXR uboot/board/sunxi/ahci.c

   1#include <common.h>
   2#include <ahci.h>
   3#include <dm.h>
   4#include <scsi.h>
   5#include <errno.h>
   6#include <asm/io.h>
   7#include <asm/gpio.h>
   8
   9#define AHCI_PHYCS0R 0x00c0
  10#define AHCI_PHYCS1R 0x00c4
  11#define AHCI_PHYCS2R 0x00c8
  12#define AHCI_RWCR    0x00fc
  13
  14/* This magic PHY initialisation was taken from the Allwinner releases
  15 * and Linux driver, but is completely undocumented.
  16 */
  17static int sunxi_ahci_phy_init(u8 *reg_base)
  18{
  19        u32 reg_val;
  20        int timeout;
  21
  22        writel(0, reg_base + AHCI_RWCR);
  23        mdelay(5);
  24
  25        setbits_le32(reg_base + AHCI_PHYCS1R, 0x1 << 19);
  26        clrsetbits_le32(reg_base + AHCI_PHYCS0R,
  27                        (0x7 << 24),
  28                        (0x5 << 24) | (0x1 << 23) | (0x1 << 18));
  29        clrsetbits_le32(reg_base + AHCI_PHYCS1R,
  30                        (0x3 << 16) | (0x1f << 8) | (0x3 << 6),
  31                        (0x2 << 16) | (0x6 << 8) | (0x2 << 6));
  32        setbits_le32(reg_base + AHCI_PHYCS1R, (0x1 << 28) | (0x1 << 15));
  33        clrbits_le32(reg_base + AHCI_PHYCS1R, (0x1 << 19));
  34        clrsetbits_le32(reg_base + AHCI_PHYCS0R, (0x7 << 20), (0x3 << 20));
  35        clrsetbits_le32(reg_base + AHCI_PHYCS2R, (0x1f << 5), (0x19 << 5));
  36        mdelay(5);
  37
  38        setbits_le32(reg_base + AHCI_PHYCS0R, (0x1 << 19));
  39
  40        timeout = 250; /* Power up takes approx 50 us */
  41        for (;;) {
  42                reg_val = readl(reg_base + AHCI_PHYCS0R) & (0x7 << 28);
  43                if (reg_val == (0x2 << 28))
  44                        break;
  45                if (--timeout == 0) {
  46                        printf("AHCI PHY power up failed.\n");
  47                        return -EIO;
  48                }
  49                udelay(1);
  50        };
  51
  52        setbits_le32(reg_base + AHCI_PHYCS2R, (0x1 << 24));
  53
  54        timeout = 100; /* Calibration takes approx 10 us */
  55        for (;;) {
  56                reg_val = readl(reg_base + AHCI_PHYCS2R) & (0x1 << 24);
  57                if (reg_val == 0x0)
  58                        break;
  59                if (--timeout == 0) {
  60                        printf("AHCI PHY calibration failed.\n");
  61                        return -EIO;
  62                }
  63                udelay(1);
  64        }
  65
  66        mdelay(15);
  67
  68        writel(0x7, reg_base + AHCI_RWCR);
  69
  70        return 0;
  71}
  72
  73#ifndef CONFIG_DM_SCSI
  74void scsi_init(void)
  75{
  76        if (sunxi_ahci_phy_init((u8 *)SUNXI_SATA_BASE) < 0)
  77                return;
  78
  79        ahci_init((void __iomem *)SUNXI_SATA_BASE);
  80}
  81#else
  82static int sunxi_sata_probe(struct udevice *dev)
  83{
  84        ulong base;
  85        u8 *reg;
  86        int ret;
  87
  88        base = dev_read_addr(dev);
  89        if (base == FDT_ADDR_T_NONE) {
  90                debug("%s: Failed to find address (err=%d\n)", __func__, ret);
  91                return -EINVAL;
  92        }
  93        reg = (u8 *)base;
  94        ret = sunxi_ahci_phy_init(reg);
  95        if (ret) {
  96                debug("%s: Failed to init phy (err=%d\n)", __func__, ret);
  97                return ret;
  98        }
  99        ret = ahci_probe_scsi(dev, base);
 100        if (ret) {
 101                debug("%s: Failed to probe (err=%d\n)", __func__, ret);
 102                return ret;
 103        }
 104
 105        return 0;
 106}
 107
 108static int sunxi_sata_bind(struct udevice *dev)
 109{
 110        struct udevice *scsi_dev;
 111        int ret;
 112
 113        ret = ahci_bind_scsi(dev, &scsi_dev);
 114        if (ret) {
 115                debug("%s: Failed to bind (err=%d\n)", __func__, ret);
 116                return ret;
 117        }
 118
 119        return 0;
 120}
 121
 122static const struct udevice_id sunxi_ahci_ids[] = {
 123        { .compatible = "allwinner,sun4i-a10-ahci" },
 124        { }
 125};
 126
 127U_BOOT_DRIVER(ahci_sunxi_drv) = {
 128        .name           = "ahci_sunxi",
 129        .id             = UCLASS_AHCI,
 130        .of_match       = sunxi_ahci_ids,
 131        .bind           = sunxi_sata_bind,
 132        .probe          = sunxi_sata_probe,
 133};
 134#endif
 135