1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 STMicroelectronics Limited
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>
15 #include <linux/ahci_platform.h>
16 #include <linux/libata.h>
17 #include <linux/reset.h>
19 #include <linux/dma-mapping.h>
23 #define DRV_NAME "st_ahci"
25 #define ST_AHCI_OOBR 0xbc
26 #define ST_AHCI_OOBR_WE BIT(31)
27 #define ST_AHCI_OOBR_CWMIN_SHIFT 24
28 #define ST_AHCI_OOBR_CWMAX_SHIFT 16
29 #define ST_AHCI_OOBR_CIMIN_SHIFT 8
30 #define ST_AHCI_OOBR_CIMAX_SHIFT 0
32 struct st_ahci_drv_data {
33 struct platform_device *ahci;
34 struct reset_control *pwr;
35 struct reset_control *sw_rst;
36 struct reset_control *pwr_rst;
39 static void st_ahci_configure_oob(void __iomem *mmio)
41 unsigned long old_val, new_val;
43 new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
44 (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
45 (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
46 (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
48 old_val = readl(mmio + ST_AHCI_OOBR);
49 writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
50 writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
51 writel(new_val, mmio + ST_AHCI_OOBR);
54 static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv,
57 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
61 err = reset_control_deassert(drv_data->pwr);
63 dev_err(dev, "unable to bring out of pwrdwn\n");
68 if (drv_data->sw_rst) {
69 err = reset_control_deassert(drv_data->sw_rst);
71 dev_err(dev, "unable to bring out of sw-rst\n");
76 if (drv_data->pwr_rst) {
77 err = reset_control_deassert(drv_data->pwr_rst);
79 dev_err(dev, "unable to bring out of pwr-rst\n");
87 static void st_ahci_host_stop(struct ata_host *host)
89 struct ahci_host_priv *hpriv = host->private_data;
90 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
91 struct device *dev = host->dev;
95 err = reset_control_assert(drv_data->pwr);
97 dev_err(dev, "unable to pwrdwn\n");
100 ahci_platform_disable_resources(hpriv);
103 static int st_ahci_probe_resets(struct ahci_host_priv *hpriv,
106 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
108 drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn");
109 if (IS_ERR(drv_data->pwr)) {
110 dev_info(dev, "power reset control not defined\n");
111 drv_data->pwr = NULL;
114 drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst");
115 if (IS_ERR(drv_data->sw_rst)) {
116 dev_info(dev, "soft reset control not defined\n");
117 drv_data->sw_rst = NULL;
120 drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst");
121 if (IS_ERR(drv_data->pwr_rst)) {
122 dev_dbg(dev, "power soft reset control not defined\n");
123 drv_data->pwr_rst = NULL;
126 return st_ahci_deassert_resets(hpriv, dev);
129 static struct ata_port_operations st_ahci_port_ops = {
130 .inherits = &ahci_platform_ops,
131 .host_stop = st_ahci_host_stop,
134 static const struct ata_port_info st_ahci_port_info = {
135 .flags = AHCI_FLAG_COMMON,
136 .pio_mask = ATA_PIO4,
137 .udma_mask = ATA_UDMA6,
138 .port_ops = &st_ahci_port_ops,
141 static struct scsi_host_template ahci_platform_sht = {
145 static int st_ahci_probe(struct platform_device *pdev)
147 struct device *dev = &pdev->dev;
148 struct st_ahci_drv_data *drv_data;
149 struct ahci_host_priv *hpriv;
152 drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
156 hpriv = ahci_platform_get_resources(pdev, 0);
158 return PTR_ERR(hpriv);
159 hpriv->plat_data = drv_data;
161 err = st_ahci_probe_resets(hpriv, &pdev->dev);
165 err = ahci_platform_enable_resources(hpriv);
169 st_ahci_configure_oob(hpriv->mmio);
171 of_property_read_u32(dev->of_node,
172 "ports-implemented", &hpriv->force_port_map);
174 err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
177 ahci_platform_disable_resources(hpriv);
184 #ifdef CONFIG_PM_SLEEP
185 static int st_ahci_suspend(struct device *dev)
187 struct ata_host *host = dev_get_drvdata(dev);
188 struct ahci_host_priv *hpriv = host->private_data;
189 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
192 err = ahci_platform_suspend_host(dev);
197 err = reset_control_assert(drv_data->pwr);
199 dev_err(dev, "unable to pwrdwn");
204 ahci_platform_disable_resources(hpriv);
209 static int st_ahci_resume(struct device *dev)
211 struct ata_host *host = dev_get_drvdata(dev);
212 struct ahci_host_priv *hpriv = host->private_data;
215 err = ahci_platform_enable_resources(hpriv);
219 err = st_ahci_deassert_resets(hpriv, dev);
221 ahci_platform_disable_resources(hpriv);
225 st_ahci_configure_oob(hpriv->mmio);
227 return ahci_platform_resume_host(dev);
231 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
233 static const struct of_device_id st_ahci_match[] = {
234 { .compatible = "st,ahci", },
237 MODULE_DEVICE_TABLE(of, st_ahci_match);
239 static struct platform_driver st_ahci_driver = {
242 .pm = &st_ahci_pm_ops,
243 .of_match_table = of_match_ptr(st_ahci_match),
245 .probe = st_ahci_probe,
246 .remove = ata_platform_remove_one,
248 module_platform_driver(st_ahci_driver);
252 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
253 MODULE_LICENSE("GPL v2");