xref: /openbmc/u-boot/board/sunxi/ahci.c (revision 0642f485)
1 #include <common.h>
2 #include <ahci.h>
3 #include <scsi.h>
4 #include <errno.h>
5 #include <asm/io.h>
6 #include <asm/gpio.h>
7 
8 #define AHCI_PHYCS0R 0x00c0
9 #define AHCI_PHYCS1R 0x00c4
10 #define AHCI_PHYCS2R 0x00c8
11 #define AHCI_RWCR    0x00fc
12 
13 /* This magic PHY initialisation was taken from the Allwinner releases
14  * and Linux driver, but is completely undocumented.
15  */
16 static int sunxi_ahci_phy_init(u32 base)
17 {
18 	u8 *reg_base = (u8 *)base;
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 void scsi_init(void)
74 {
75 	if (sunxi_ahci_phy_init(SUNXI_SATA_BASE) < 0)
76 		return;
77 
78 	ahci_init((void __iomem *)SUNXI_SATA_BASE);
79 }
80