| Bartlomiej Zolnierkiewicz | ae8723f | 2014-03-25 19:51:40 +0100 | [diff] [blame] | 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"); |