ahci.c
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#include <common.h>
#include <ahci.h>
#include <scsi.h>
#include <errno.h>
#include <asm/io.h>
#include <asm/gpio.h>
#define AHCI_PHYCS0R 0x00c0
#define AHCI_PHYCS1R 0x00c4
#define AHCI_PHYCS2R 0x00c8
#define AHCI_RWCR 0x00fc
/* This magic PHY initialisation was taken from the Allwinner releases
* and Linux driver, but is completely undocumented.
*/
static int sunxi_ahci_phy_init(u32 base)
{
u8 *reg_base = (u8 *)base;
u32 reg_val;
int timeout;
writel(0, reg_base + AHCI_RWCR);
mdelay(5);
setbits_le32(reg_base + AHCI_PHYCS1R, 0x1 << 19);
clrsetbits_le32(reg_base + AHCI_PHYCS0R,
(0x7 << 24),
(0x5 << 24) | (0x1 << 23) | (0x1 << 18));
clrsetbits_le32(reg_base + AHCI_PHYCS1R,
(0x3 << 16) | (0x1f << 8) | (0x3 << 6),
(0x2 << 16) | (0x6 << 8) | (0x2 << 6));
setbits_le32(reg_base + AHCI_PHYCS1R, (0x1 << 28) | (0x1 << 15));
clrbits_le32(reg_base + AHCI_PHYCS1R, (0x1 << 19));
clrsetbits_le32(reg_base + AHCI_PHYCS0R, (0x7 << 20), (0x3 << 20));
clrsetbits_le32(reg_base + AHCI_PHYCS2R, (0x1f << 5), (0x19 << 5));
mdelay(5);
setbits_le32(reg_base + AHCI_PHYCS0R, (0x1 << 19));
timeout = 250; /* Power up takes approx 50 us */
for (;;) {
reg_val = readl(reg_base + AHCI_PHYCS0R) & (0x7 << 28);
if (reg_val == (0x2 << 28))
break;
if (--timeout == 0) {
printf("AHCI PHY power up failed.\n");
return -EIO;
}
udelay(1);
};
setbits_le32(reg_base + AHCI_PHYCS2R, (0x1 << 24));
timeout = 100; /* Calibration takes approx 10 us */
for (;;) {
reg_val = readl(reg_base + AHCI_PHYCS2R) & (0x1 << 24);
if (reg_val == 0x0)
break;
if (--timeout == 0) {
printf("AHCI PHY calibration failed.\n");
return -EIO;
}
udelay(1);
}
mdelay(15);
writel(0x7, reg_base + AHCI_RWCR);
return 0;
}
void scsi_init(void)
{
printf("SUNXI SCSI INIT\n");
#ifdef CONFIG_SATAPWR
gpio_request(CONFIG_SATAPWR, "satapwr");
gpio_direction_output(CONFIG_SATAPWR, 1);
/* Give attached sata device time to power-up to avoid link timeouts */
mdelay(500);
#endif
if (sunxi_ahci_phy_init(SUNXI_SATA_BASE) < 0)
return;
ahci_init(SUNXI_SATA_BASE);
}