Lee Jones | 76884cb | 2014-02-26 14:47:21 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2012 STMicroelectronics Limited |
| 3 | * |
| 4 | * Authors: Francesco Virlinzi <francesco.virlinzi@st.com> |
| 5 | * Alexandre Torgue <alexandre.torgue@st.com> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License version 2 as |
| 9 | * published by the Free Software Foundation. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/init.h> |
| 13 | #include <linux/module.h> |
| 14 | #include <linux/export.h> |
| 15 | #include <linux/platform_device.h> |
| 16 | #include <linux/clk.h> |
| 17 | #include <linux/of.h> |
| 18 | #include <linux/ahci_platform.h> |
| 19 | #include <linux/phy/phy.h> |
| 20 | #include <linux/libata.h> |
| 21 | #include <linux/reset.h> |
| 22 | #include <linux/io.h> |
| 23 | #include <linux/dma-mapping.h> |
| 24 | |
| 25 | #include "ahci.h" |
| 26 | |
| 27 | #define ST_AHCI_OOBR 0xbc |
| 28 | #define ST_AHCI_OOBR_WE BIT(31) |
| 29 | #define ST_AHCI_OOBR_CWMIN_SHIFT 24 |
| 30 | #define ST_AHCI_OOBR_CWMAX_SHIFT 16 |
| 31 | #define ST_AHCI_OOBR_CIMIN_SHIFT 8 |
| 32 | #define ST_AHCI_OOBR_CIMAX_SHIFT 0 |
| 33 | |
| 34 | struct st_ahci_drv_data { |
| 35 | struct platform_device *ahci; |
| 36 | struct phy *phy; |
| 37 | struct reset_control *pwr; |
| 38 | struct reset_control *sw_rst; |
| 39 | struct reset_control *pwr_rst; |
| 40 | struct ahci_host_priv *hpriv; |
| 41 | }; |
| 42 | |
| 43 | static void st_ahci_configure_oob(void __iomem *mmio) |
| 44 | { |
| 45 | unsigned long old_val, new_val; |
| 46 | |
| 47 | new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) | |
| 48 | (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) | |
| 49 | (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) | |
| 50 | (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT); |
| 51 | |
| 52 | old_val = readl(mmio + ST_AHCI_OOBR); |
| 53 | writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); |
| 54 | writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); |
| 55 | writel(new_val, mmio + ST_AHCI_OOBR); |
| 56 | } |
| 57 | |
| 58 | static int st_ahci_deassert_resets(struct device *dev) |
| 59 | { |
| 60 | struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev); |
| 61 | int err; |
| 62 | |
| 63 | if (drv_data->pwr) { |
| 64 | err = reset_control_deassert(drv_data->pwr); |
| 65 | if (err) { |
| 66 | dev_err(dev, "unable to bring out of pwrdwn\n"); |
| 67 | return err; |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | st_ahci_configure_oob(drv_data->hpriv->mmio); |
| 72 | |
| 73 | if (drv_data->sw_rst) { |
| 74 | err = reset_control_deassert(drv_data->sw_rst); |
| 75 | if (err) { |
| 76 | dev_err(dev, "unable to bring out of sw-rst\n"); |
| 77 | return err; |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | if (drv_data->pwr_rst) { |
| 82 | err = reset_control_deassert(drv_data->pwr_rst); |
| 83 | if (err) { |
| 84 | dev_err(dev, "unable to bring out of pwr-rst\n"); |
| 85 | return err; |
| 86 | } |
| 87 | } |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | static int st_ahci_probe_resets(struct platform_device *pdev) |
| 93 | { |
| 94 | struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev); |
| 95 | |
| 96 | drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn"); |
| 97 | if (IS_ERR(drv_data->pwr)) { |
| 98 | dev_info(&pdev->dev, "power reset control not defined\n"); |
| 99 | drv_data->pwr = NULL; |
| 100 | } |
| 101 | |
| 102 | drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst"); |
| 103 | if (IS_ERR(drv_data->sw_rst)) { |
| 104 | dev_info(&pdev->dev, "soft reset control not defined\n"); |
| 105 | drv_data->sw_rst = NULL; |
| 106 | } |
| 107 | |
| 108 | drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst"); |
| 109 | if (IS_ERR(drv_data->pwr_rst)) { |
| 110 | dev_dbg(&pdev->dev, "power soft reset control not defined\n"); |
| 111 | drv_data->pwr_rst = NULL; |
| 112 | } |
| 113 | |
| 114 | return st_ahci_deassert_resets(&pdev->dev); |
| 115 | } |
| 116 | |
| 117 | static const struct ata_port_info st_ahci_port_info = { |
| 118 | .flags = AHCI_FLAG_COMMON, |
| 119 | .pio_mask = ATA_PIO4, |
| 120 | .udma_mask = ATA_UDMA6, |
| 121 | .port_ops = &ahci_platform_ops, |
| 122 | }; |
| 123 | |
| 124 | static int st_ahci_probe(struct platform_device *pdev) |
| 125 | { |
| 126 | struct st_ahci_drv_data *drv_data; |
| 127 | struct ahci_host_priv *hpriv; |
| 128 | int err; |
| 129 | |
| 130 | drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL); |
| 131 | if (!drv_data) |
| 132 | return -ENOMEM; |
| 133 | |
| 134 | platform_set_drvdata(pdev, drv_data); |
| 135 | |
| 136 | hpriv = ahci_platform_get_resources(pdev); |
| 137 | if (IS_ERR(hpriv)) |
| 138 | return PTR_ERR(hpriv); |
| 139 | |
| 140 | drv_data->hpriv = hpriv; |
| 141 | |
| 142 | err = st_ahci_probe_resets(pdev); |
| 143 | if (err) |
| 144 | return err; |
| 145 | |
| 146 | err = ahci_platform_enable_resources(hpriv); |
| 147 | if (err) |
| 148 | return err; |
| 149 | |
| 150 | err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, 0, 0); |
| 151 | if (err) { |
| 152 | ahci_platform_disable_resources(hpriv); |
| 153 | return err; |
| 154 | } |
| 155 | |
| 156 | return 0; |
| 157 | } |
| 158 | |
| 159 | static int st_ahci_remove(struct platform_device *pdev) |
| 160 | { |
| 161 | struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev); |
| 162 | struct ahci_host_priv *hpriv = drv_data->hpriv; |
| 163 | int err; |
| 164 | |
| 165 | if (drv_data->pwr) { |
| 166 | err = reset_control_assert(drv_data->pwr); |
| 167 | if (err) |
| 168 | dev_err(&pdev->dev, "unable to pwrdwn\n"); |
| 169 | } |
| 170 | |
| 171 | ahci_platform_disable_resources(hpriv); |
| 172 | |
| 173 | return 0; |
| 174 | } |
| 175 | |
| 176 | #ifdef CONFIG_PM_SLEEP |
| 177 | static int st_ahci_suspend(struct device *dev) |
| 178 | { |
| 179 | struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev); |
| 180 | struct ahci_host_priv *hpriv = drv_data->hpriv; |
| 181 | int err; |
| 182 | |
| 183 | if (drv_data->pwr) { |
| 184 | err = reset_control_assert(drv_data->pwr); |
| 185 | if (err) { |
| 186 | dev_err(dev, "unable to pwrdwn"); |
| 187 | return err; |
| 188 | } |
| 189 | } |
| 190 | |
| 191 | ahci_platform_disable_resources(hpriv); |
| 192 | |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static int st_ahci_resume(struct device *dev) |
| 197 | { |
| 198 | struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev); |
| 199 | struct ahci_host_priv *hpriv = drv_data->hpriv; |
| 200 | int err; |
| 201 | |
| 202 | err = ahci_platform_enable_resources(hpriv); |
| 203 | if (err) |
| 204 | return err; |
| 205 | |
| 206 | err = st_ahci_deassert_resets(dev); |
| 207 | if (err) { |
| 208 | ahci_platform_disable_resources(hpriv); |
| 209 | return err; |
| 210 | } |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | #endif |
| 215 | |
| 216 | static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume); |
| 217 | |
| 218 | static struct of_device_id st_ahci_match[] = { |
| 219 | { .compatible = "st,ahci", }, |
| 220 | {}, |
| 221 | }; |
| 222 | MODULE_DEVICE_TABLE(of, st_ahci_match); |
| 223 | |
| 224 | static struct platform_driver st_ahci_driver = { |
| 225 | .driver = { |
| 226 | .name = "st_ahci", |
| 227 | .owner = THIS_MODULE, |
| 228 | .pm = &st_ahci_pm_ops, |
| 229 | .of_match_table = of_match_ptr(st_ahci_match), |
| 230 | }, |
| 231 | .probe = st_ahci_probe, |
| 232 | .remove = st_ahci_remove, |
| 233 | }; |
| 234 | module_platform_driver(st_ahci_driver); |
| 235 | |
| 236 | MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>"); |
| 237 | MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>"); |
| 238 | MODULE_DESCRIPTION("STMicroelectronics Sata Ahci driver"); |
| 239 | MODULE_LICENSE("GPL v2"); |