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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 | ||
19 | /* SATA PHY Control Register offset from AHCI base */ | |
20 | #define SATA_P0PHYCR_REG 0x178 | |
21 | ||
22 | #define SATA_PHY_MPY(x) ((x) << 0) | |
23 | #define SATA_PHY_LOS(x) ((x) << 6) | |
24 | #define SATA_PHY_RXCDR(x) ((x) << 10) | |
25 | #define SATA_PHY_RXEQ(x) ((x) << 13) | |
26 | #define SATA_PHY_TXSWING(x) ((x) << 19) | |
27 | #define SATA_PHY_ENPLL(x) ((x) << 31) | |
28 | ||
29 | /* | |
30 | * The multiplier needed for 1.5GHz PLL output. | |
31 | * | |
32 | * NOTE: This is currently hardcoded to be suitable for 100MHz crystal | |
33 | * frequency (which is used by DA850 EVM board) and may need to be changed | |
34 | * if you would like to use this driver on some other board. | |
35 | */ | |
36 | #define DA850_SATA_CLK_MULTIPLIER 7 | |
37 | ||
38 | static void da850_sata_init(struct device *dev, void __iomem *pwrdn_reg, | |
39 | void __iomem *ahci_base) | |
40 | { | |
41 | unsigned int val; | |
42 | ||
43 | /* Enable SATA clock receiver */ | |
44 | val = readl(pwrdn_reg); | |
45 | val &= ~BIT(0); | |
46 | writel(val, pwrdn_reg); | |
47 | ||
48 | val = SATA_PHY_MPY(DA850_SATA_CLK_MULTIPLIER + 1) | SATA_PHY_LOS(1) | | |
49 | SATA_PHY_RXCDR(4) | SATA_PHY_RXEQ(1) | SATA_PHY_TXSWING(3) | | |
50 | SATA_PHY_ENPLL(1); | |
51 | ||
52 | writel(val, ahci_base + SATA_P0PHYCR_REG); | |
53 | } | |
54 | ||
55 | static const struct ata_port_info ahci_da850_port_info = { | |
56 | .flags = AHCI_FLAG_COMMON, | |
57 | .pio_mask = ATA_PIO4, | |
58 | .udma_mask = ATA_UDMA6, | |
59 | .port_ops = &ahci_platform_ops, | |
60 | }; | |
61 | ||
62 | static int ahci_da850_probe(struct platform_device *pdev) | |
63 | { | |
64 | struct device *dev = &pdev->dev; | |
65 | struct ahci_host_priv *hpriv; | |
66 | struct resource *res; | |
67 | void __iomem *pwrdn_reg; | |
68 | int rc; | |
69 | ||
70 | hpriv = ahci_platform_get_resources(pdev); | |
71 | if (IS_ERR(hpriv)) | |
72 | return PTR_ERR(hpriv); | |
73 | ||
74 | rc = ahci_platform_enable_resources(hpriv); | |
75 | if (rc) | |
76 | return rc; | |
77 | ||
78 | res = platform_get_resource(pdev, IORESOURCE_MEM, 1); | |
79 | if (!res) | |
80 | goto disable_resources; | |
81 | ||
82 | pwrdn_reg = devm_ioremap(dev, res->start, resource_size(res)); | |
83 | if (!pwrdn_reg) | |
84 | goto disable_resources; | |
85 | ||
86 | da850_sata_init(dev, pwrdn_reg, hpriv->mmio); | |
87 | ||
88 | rc = ahci_platform_init_host(pdev, hpriv, &ahci_da850_port_info, 0, 0); | |
89 | if (rc) | |
90 | goto disable_resources; | |
91 | ||
92 | return 0; | |
93 | disable_resources: | |
94 | ahci_platform_disable_resources(hpriv); | |
95 | return rc; | |
96 | } | |
97 | ||
98 | static SIMPLE_DEV_PM_OPS(ahci_da850_pm_ops, ahci_platform_suspend, | |
99 | ahci_platform_resume); | |
100 | ||
101 | static struct platform_driver ahci_da850_driver = { | |
102 | .probe = ahci_da850_probe, | |
103 | .remove = ata_platform_remove_one, | |
104 | .driver = { | |
105 | .name = "ahci_da850", | |
106 | .owner = THIS_MODULE, | |
107 | .pm = &ahci_da850_pm_ops, | |
108 | }, | |
109 | }; | |
110 | module_platform_driver(ahci_da850_driver); | |
111 | ||
112 | MODULE_DESCRIPTION("DaVinci DA850 AHCI SATA platform driver"); | |
113 | MODULE_AUTHOR("Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>"); | |
114 | MODULE_LICENSE("GPL"); |