summaryrefslogtreecommitdiff
path: root/board/sunxi/ahci.c
blob: 522e54ab160e1c576c3beecf5beb773636b775d8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
#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)
{
	if (sunxi_ahci_phy_init(SUNXI_SATA_BASE) < 0)
		return;

	ahci_init((void __iomem *)SUNXI_SATA_BASE);
}