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/libata.h> 20 #include <linux/reset.h> 21 #include <linux/io.h> 22 #include <linux/dma-mapping.h> 23 24 #include "ahci.h" 25 26 #define DRV_NAME "st_ahci" 27 28 #define ST_AHCI_OOBR 0xbc 29 #define ST_AHCI_OOBR_WE BIT(31) 30 #define ST_AHCI_OOBR_CWMIN_SHIFT 24 31 #define ST_AHCI_OOBR_CWMAX_SHIFT 16 32 #define ST_AHCI_OOBR_CIMIN_SHIFT 8 33 #define ST_AHCI_OOBR_CIMAX_SHIFT 0 34 35 struct st_ahci_drv_data { 36 struct platform_device *ahci; 37 struct reset_control *pwr; 38 struct reset_control *sw_rst; 39 struct reset_control *pwr_rst; 40 }; 41 42 static void st_ahci_configure_oob(void __iomem *mmio) 43 { 44 unsigned long old_val, new_val; 45 46 new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) | 47 (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) | 48 (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) | 49 (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT); 50 51 old_val = readl(mmio + ST_AHCI_OOBR); 52 writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); 53 writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); 54 writel(new_val, mmio + ST_AHCI_OOBR); 55 } 56 57 static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv, 58 struct device *dev) 59 { 60 struct st_ahci_drv_data *drv_data = hpriv->plat_data; 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 if (drv_data->sw_rst) { 72 err = reset_control_deassert(drv_data->sw_rst); 73 if (err) { 74 dev_err(dev, "unable to bring out of sw-rst\n"); 75 return err; 76 } 77 } 78 79 if (drv_data->pwr_rst) { 80 err = reset_control_deassert(drv_data->pwr_rst); 81 if (err) { 82 dev_err(dev, "unable to bring out of pwr-rst\n"); 83 return err; 84 } 85 } 86 87 return 0; 88 } 89 90 static void st_ahci_host_stop(struct ata_host *host) 91 { 92 struct ahci_host_priv *hpriv = host->private_data; 93 struct st_ahci_drv_data *drv_data = hpriv->plat_data; 94 struct device *dev = host->dev; 95 int err; 96 97 if (drv_data->pwr) { 98 err = reset_control_assert(drv_data->pwr); 99 if (err) 100 dev_err(dev, "unable to pwrdwn\n"); 101 } 102 103 ahci_platform_disable_resources(hpriv); 104 } 105 106 static int st_ahci_probe_resets(struct ahci_host_priv *hpriv, 107 struct device *dev) 108 { 109 struct st_ahci_drv_data *drv_data = hpriv->plat_data; 110 111 drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn"); 112 if (IS_ERR(drv_data->pwr)) { 113 dev_info(dev, "power reset control not defined\n"); 114 drv_data->pwr = NULL; 115 } 116 117 drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst"); 118 if (IS_ERR(drv_data->sw_rst)) { 119 dev_info(dev, "soft reset control not defined\n"); 120 drv_data->sw_rst = NULL; 121 } 122 123 drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst"); 124 if (IS_ERR(drv_data->pwr_rst)) { 125 dev_dbg(dev, "power soft reset control not defined\n"); 126 drv_data->pwr_rst = NULL; 127 } 128 129 return st_ahci_deassert_resets(hpriv, dev); 130 } 131 132 static struct ata_port_operations st_ahci_port_ops = { 133 .inherits = &ahci_platform_ops, 134 .host_stop = st_ahci_host_stop, 135 }; 136 137 static const struct ata_port_info st_ahci_port_info = { 138 .flags = AHCI_FLAG_COMMON, 139 .pio_mask = ATA_PIO4, 140 .udma_mask = ATA_UDMA6, 141 .port_ops = &st_ahci_port_ops, 142 }; 143 144 static struct scsi_host_template ahci_platform_sht = { 145 AHCI_SHT(DRV_NAME), 146 }; 147 148 static int st_ahci_probe(struct platform_device *pdev) 149 { 150 struct st_ahci_drv_data *drv_data; 151 struct ahci_host_priv *hpriv; 152 int err; 153 154 drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL); 155 if (!drv_data) 156 return -ENOMEM; 157 158 hpriv = ahci_platform_get_resources(pdev); 159 if (IS_ERR(hpriv)) 160 return PTR_ERR(hpriv); 161 hpriv->plat_data = drv_data; 162 163 err = st_ahci_probe_resets(hpriv, &pdev->dev); 164 if (err) 165 return err; 166 167 err = ahci_platform_enable_resources(hpriv); 168 if (err) 169 return err; 170 171 st_ahci_configure_oob(hpriv->mmio); 172 173 err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, 174 &ahci_platform_sht); 175 if (err) { 176 ahci_platform_disable_resources(hpriv); 177 return err; 178 } 179 180 return 0; 181 } 182 183 #ifdef CONFIG_PM_SLEEP 184 static int st_ahci_suspend(struct device *dev) 185 { 186 struct ata_host *host = dev_get_drvdata(dev); 187 struct ahci_host_priv *hpriv = host->private_data; 188 struct st_ahci_drv_data *drv_data = hpriv->plat_data; 189 int err; 190 191 err = ahci_platform_suspend_host(dev); 192 if (err) 193 return err; 194 195 if (drv_data->pwr) { 196 err = reset_control_assert(drv_data->pwr); 197 if (err) { 198 dev_err(dev, "unable to pwrdwn"); 199 return err; 200 } 201 } 202 203 ahci_platform_disable_resources(hpriv); 204 205 return 0; 206 } 207 208 static int st_ahci_resume(struct device *dev) 209 { 210 struct ata_host *host = dev_get_drvdata(dev); 211 struct ahci_host_priv *hpriv = host->private_data; 212 int err; 213 214 err = ahci_platform_enable_resources(hpriv); 215 if (err) 216 return err; 217 218 err = st_ahci_deassert_resets(hpriv, dev); 219 if (err) { 220 ahci_platform_disable_resources(hpriv); 221 return err; 222 } 223 224 st_ahci_configure_oob(hpriv->mmio); 225 226 return ahci_platform_resume_host(dev); 227 } 228 #endif 229 230 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume); 231 232 static const struct of_device_id st_ahci_match[] = { 233 { .compatible = "st,ahci", }, 234 {}, 235 }; 236 MODULE_DEVICE_TABLE(of, st_ahci_match); 237 238 static struct platform_driver st_ahci_driver = { 239 .driver = { 240 .name = DRV_NAME, 241 .pm = &st_ahci_pm_ops, 242 .of_match_table = of_match_ptr(st_ahci_match), 243 }, 244 .probe = st_ahci_probe, 245 .remove = ata_platform_remove_one, 246 }; 247 module_platform_driver(st_ahci_driver); 248 249 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>"); 250 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>"); 251 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver"); 252 MODULE_LICENSE("GPL v2"); 253