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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2012 STMicroelectronics Limited4 *5 * Authors: Francesco Virlinzi <francesco.virlinzi@st.com>6 * Alexandre Torgue <alexandre.torgue@st.com>7 */8 9#include <linux/init.h>10#include <linux/module.h>11#include <linux/export.h>12#include <linux/platform_device.h>13#include <linux/clk.h>14#include <linux/of.h>15#include <linux/ahci_platform.h>16#include <linux/libata.h>17#include <linux/reset.h>18#include <linux/io.h>19#include <linux/dma-mapping.h>20 21#include "ahci.h"22 23#define DRV_NAME "st_ahci"24 25#define ST_AHCI_OOBR 0xbc26#define ST_AHCI_OOBR_WE BIT(31)27#define ST_AHCI_OOBR_CWMIN_SHIFT 2428#define ST_AHCI_OOBR_CWMAX_SHIFT 1629#define ST_AHCI_OOBR_CIMIN_SHIFT 830#define ST_AHCI_OOBR_CIMAX_SHIFT 031 32struct st_ahci_drv_data {33 struct reset_control *pwr;34 struct reset_control *sw_rst;35 struct reset_control *pwr_rst;36};37 38static void st_ahci_configure_oob(void __iomem *mmio)39{40 unsigned long old_val, new_val;41 42 new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |43 (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |44 (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |45 (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);46 47 old_val = readl(mmio + ST_AHCI_OOBR);48 writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);49 writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);50 writel(new_val, mmio + ST_AHCI_OOBR);51}52 53static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv,54 struct device *dev)55{56 struct st_ahci_drv_data *drv_data = hpriv->plat_data;57 int err;58 59 if (drv_data->pwr) {60 err = reset_control_deassert(drv_data->pwr);61 if (err) {62 dev_err(dev, "unable to bring out of pwrdwn\n");63 return err;64 }65 }66 67 if (drv_data->sw_rst) {68 err = reset_control_deassert(drv_data->sw_rst);69 if (err) {70 dev_err(dev, "unable to bring out of sw-rst\n");71 return err;72 }73 }74 75 if (drv_data->pwr_rst) {76 err = reset_control_deassert(drv_data->pwr_rst);77 if (err) {78 dev_err(dev, "unable to bring out of pwr-rst\n");79 return err;80 }81 }82 83 return 0;84}85 86static void st_ahci_host_stop(struct ata_host *host)87{88 struct ahci_host_priv *hpriv = host->private_data;89 struct st_ahci_drv_data *drv_data = hpriv->plat_data;90 struct device *dev = host->dev;91 int err;92 93 if (drv_data->pwr) {94 err = reset_control_assert(drv_data->pwr);95 if (err)96 dev_err(dev, "unable to pwrdwn\n");97 }98 99 ahci_platform_disable_resources(hpriv);100}101 102static int st_ahci_probe_resets(struct ahci_host_priv *hpriv,103 struct device *dev)104{105 struct st_ahci_drv_data *drv_data = hpriv->plat_data;106 107 drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn");108 if (IS_ERR(drv_data->pwr)) {109 dev_info(dev, "power reset control not defined\n");110 drv_data->pwr = NULL;111 }112 113 drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst");114 if (IS_ERR(drv_data->sw_rst)) {115 dev_info(dev, "soft reset control not defined\n");116 drv_data->sw_rst = NULL;117 }118 119 drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst");120 if (IS_ERR(drv_data->pwr_rst)) {121 dev_dbg(dev, "power soft reset control not defined\n");122 drv_data->pwr_rst = NULL;123 }124 125 return st_ahci_deassert_resets(hpriv, dev);126}127 128static struct ata_port_operations st_ahci_port_ops = {129 .inherits = &ahci_platform_ops,130 .host_stop = st_ahci_host_stop,131};132 133static const struct ata_port_info st_ahci_port_info = {134 .flags = AHCI_FLAG_COMMON,135 .pio_mask = ATA_PIO4,136 .udma_mask = ATA_UDMA6,137 .port_ops = &st_ahci_port_ops,138};139 140static const struct scsi_host_template ahci_platform_sht = {141 AHCI_SHT(DRV_NAME),142};143 144static int st_ahci_probe(struct platform_device *pdev)145{146 struct st_ahci_drv_data *drv_data;147 struct ahci_host_priv *hpriv;148 int err;149 150 drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);151 if (!drv_data)152 return -ENOMEM;153 154 hpriv = ahci_platform_get_resources(pdev, 0);155 if (IS_ERR(hpriv))156 return PTR_ERR(hpriv);157 hpriv->plat_data = drv_data;158 159 err = st_ahci_probe_resets(hpriv, &pdev->dev);160 if (err)161 return err;162 163 err = ahci_platform_enable_resources(hpriv);164 if (err)165 return err;166 167 st_ahci_configure_oob(hpriv->mmio);168 169 err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,170 &ahci_platform_sht);171 if (err) {172 ahci_platform_disable_resources(hpriv);173 return err;174 }175 176 return 0;177}178 179#ifdef CONFIG_PM_SLEEP180static int st_ahci_suspend(struct device *dev)181{182 struct ata_host *host = dev_get_drvdata(dev);183 struct ahci_host_priv *hpriv = host->private_data;184 struct st_ahci_drv_data *drv_data = hpriv->plat_data;185 int err;186 187 err = ahci_platform_suspend_host(dev);188 if (err)189 return err;190 191 if (drv_data->pwr) {192 err = reset_control_assert(drv_data->pwr);193 if (err) {194 dev_err(dev, "unable to pwrdwn");195 return err;196 }197 }198 199 ahci_platform_disable_resources(hpriv);200 201 return 0;202}203 204static int st_ahci_resume(struct device *dev)205{206 struct ata_host *host = dev_get_drvdata(dev);207 struct ahci_host_priv *hpriv = host->private_data;208 int err;209 210 err = ahci_platform_enable_resources(hpriv);211 if (err)212 return err;213 214 err = st_ahci_deassert_resets(hpriv, dev);215 if (err) {216 ahci_platform_disable_resources(hpriv);217 return err;218 }219 220 st_ahci_configure_oob(hpriv->mmio);221 222 return ahci_platform_resume_host(dev);223}224#endif225 226static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);227 228static const struct of_device_id st_ahci_match[] = {229 { .compatible = "st,ahci", },230 { /* sentinel */ }231};232MODULE_DEVICE_TABLE(of, st_ahci_match);233 234static struct platform_driver st_ahci_driver = {235 .driver = {236 .name = DRV_NAME,237 .pm = &st_ahci_pm_ops,238 .of_match_table = st_ahci_match,239 },240 .probe = st_ahci_probe,241 .remove_new = ata_platform_remove_one,242};243module_platform_driver(st_ahci_driver);244 245MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");246MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");247MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");248MODULE_LICENSE("GPL v2");249