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ae8723f8 BZ |
1 | /* |
2 | * DaVinci DA850 AHCI SATA platform driver | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2, or (at your option) | |
7 | * any later version. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/pm.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/platform_device.h> | |
15 | #include <linux/libata.h> | |
16 | #include <linux/ahci_platform.h> | |
17 | #include "ahci.h" | |
18 | ||
018d5ef2 AM |
19 | #define DRV_NAME "ahci_da850" |
20 | ||
ae8723f8 BZ |
21 | /* SATA PHY Control Register offset from AHCI base */ |
22 | #define SATA_P0PHYCR_REG 0x178 | |
23 | ||
24 | #define SATA_PHY_MPY(x) ((x) << 0) | |
25 | #define SATA_PHY_LOS(x) ((x) << 6) | |
26 | #define SATA_PHY_RXCDR(x) ((x) << 10) | |
27 | #define SATA_PHY_RXEQ(x) ((x) << 13) | |
28 | #define SATA_PHY_TXSWING(x) ((x) << 19) | |
29 | #define SATA_PHY_ENPLL(x) ((x) << 31) | |
30 | ||
31 | /* | |
32 | * The multiplier needed for 1.5GHz PLL output. | |
33 | * | |
34 | * NOTE: This is currently hardcoded to be suitable for 100MHz crystal | |
35 | * frequency (which is used by DA850 EVM board) and may need to be changed | |
36 | * if you would like to use this driver on some other board. | |
37 | */ | |
38 | #define DA850_SATA_CLK_MULTIPLIER 7 | |
39 | ||
40 | static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg, | |
41 | void __iomem *ahci_base) | |
42 | { | |
43 | unsigned int val; | |
44 | ||
45 | /* Enable SATA clock receiver */ | |
46 | val = readl(pwrdn_reg); | |
47 | val &= ~BIT(0); | |
48 | writel(val, pwrdn_reg); | |
49 | ||
50 | val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) | | |
51 | SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) | | |
52 | SATA_PHY_ENPLL(1); | |
53 | ||
54 | writel(val, ahci_base + SATA_P0PHYCR_REG); | |
55 | } | |
56 | ||
c472ae47 BG |
57 | static int ahci_da850_softreset(struct ata_link *link, |
58 | unsigned int *class, unsigned long deadline) | |
59 | { | |
60 | int pmp, ret; | |
61 | ||
62 | pmp = sata_srst_pmp(link); | |
63 | ||
64 | /* | |
65 | * There's an issue with the SATA controller on da850 SoCs: if we | |
66 | * enable Port Multiplier support, but the drive is connected directly | |
67 | * to the board, it can't be detected. As a workaround: if PMP is | |
68 | * enabled, we first call ahci_do_softreset() and pass it the result of | |
69 | * sata_srst_pmp(). If this call fails, we retry with pmp = 0. | |
70 | */ | |
71 | ret = ahci_do_softreset(link, class, pmp, deadline, ahci_check_ready); | |
72 | if (pmp && ret == -EBUSY) | |
73 | return ahci_do_softreset(link, class, 0, | |
74 | deadline, ahci_check_ready); | |
75 | ||
76 | return ret; | |
77 | } | |
78 | ||
79 | static struct ata_port_operations ahci_da850_port_ops = { | |
80 | .inherits = &ahci_platform_ops, | |
81 | .softreset = ahci_da850_softreset, | |
82 | /* | |
83 | * No need to override .pmp_softreset - it's only used for actual | |
84 | * PMP-enabled ports. | |
85 | */ | |
86 | }; | |
87 | ||
ae8723f8 BZ |
88 | static const struct ata_port_info ahci_da850_port_info = { |
89 | .flags = AHCI_FLAG_COMMON, | |
90 | .pio_mask = ATA_PIO4, | |
91 | .udma_mask = ATA_UDMA6, | |
c472ae47 | 92 | .port_ops = &ahci_da850_port_ops, |
ae8723f8 BZ |
93 | }; |
94 | ||
018d5ef2 AM |
95 | static struct scsi_host_template ahci_platform_sht = { |
96 | AHCI_SHT(DRV_NAME), | |
97 | }; | |
98 | ||
ae8723f8 BZ |
99 | static int ahci_da850_probe(struct platform_device *pdev) |
100 | { | |
101 | struct device *dev = &pdev->dev; | |
102 | struct ahci_host_priv *hpriv; | |
103 | struct resource *res; | |
104 | void __iomem *pwrdn_reg; | |
105 | int rc; | |
106 | ||
107 | hpriv = ahci_platform_get_resources(pdev); | |
108 | if (IS_ERR(hpriv)) | |
109 | return PTR_ERR(hpriv); | |
110 | ||
111 | rc = ahci_platform_enable_resources(hpriv); | |
112 | if (rc) | |
113 | return rc; | |
114 | ||
115 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
116 | if (!res) | |
117 | goto disable_resources; | |
118 | ||
119 | pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res)); | |
120 | if (!pwrdn_reg) | |
121 | goto disable_resources; | |
122 | ||
123 | da850_sata_init(dev, pwrdn_reg, hpriv->mmio); | |
124 | ||
018d5ef2 AM |
125 | rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info, |
126 | &ahci_platform_sht); | |
ae8723f8 BZ |
127 | if (rc) |
128 | goto disable_resources; | |
129 | ||
130 | return 0; | |
131 | disable_resources: | |
132 | ahci_platform_disable_resources(hpriv); | |
133 | return rc; | |
134 | } | |
135 | ||
136 | static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend, | |
137 | ahci_platform_resume); | |
138 | ||
139 | static struct platform_driver ahci_da850_driver = { | |
140 | .probe = ahci_da850_probe, | |
141 | .remove = ata_platform_remove_one, | |
142 | .driver = { | |
018d5ef2 | 143 | .name = DRV_NAME, |
ae8723f8 BZ |
144 | .pm = &ahci_da850_pm_ops, |
145 | }, | |
146 | }; | |
147 | module_platform_driver(ahci_da850_driver); | |
148 | ||
149 | MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver"); | |
150 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>"); | |
151 | MODULE_LICENSE("GPL"); |