2 * Copyright (C) 2012 STMicroelectronics Limited
4 * Authors: Francesco Virlinzi <francesco.virlinzi@st.com>
5 * Alexandre Torgue <alexandre.torgue@st.com>
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.
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>
18 #include <linux/ahci_platform.h>
19 #include <linux/libata.h>
20 #include <linux/reset.h>
22 #include <linux/dma-mapping.h>
26 #define ST_AHCI_OOBR 0xbc
27 #define ST_AHCI_OOBR_WE BIT(31)
28 #define ST_AHCI_OOBR_CWMIN_SHIFT 24
29 #define ST_AHCI_OOBR_CWMAX_SHIFT 16
30 #define ST_AHCI_OOBR_CIMIN_SHIFT 8
31 #define ST_AHCI_OOBR_CIMAX_SHIFT 0
33 struct st_ahci_drv_data {
34 struct platform_device *ahci;
35 struct reset_control *pwr;
36 struct reset_control *sw_rst;
37 struct reset_control *pwr_rst;
38 struct ahci_host_priv *hpriv;
41 static void st_ahci_configure_oob(void __iomem *mmio)
43 unsigned long old_val, new_val;
45 new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
46 (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
47 (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
48 (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
50 old_val = readl(mmio + ST_AHCI_OOBR);
51 writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
52 writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
53 writel(new_val, mmio + ST_AHCI_OOBR);
56 static int st_ahci_deassert_resets(struct device *dev)
58 struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
62 err = reset_control_deassert(drv_data->pwr);
64 dev_err(dev, "unable to bring out of pwrdwn\n");
69 st_ahci_configure_oob(drv_data->hpriv->mmio);
71 if (drv_data->sw_rst) {
72 err = reset_control_deassert(drv_data->sw_rst);
74 dev_err(dev, "unable to bring out of sw-rst\n");
79 if (drv_data->pwr_rst) {
80 err = reset_control_deassert(drv_data->pwr_rst);
82 dev_err(dev, "unable to bring out of pwr-rst\n");
90 static int st_ahci_exit(struct device *dev)
92 struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
93 struct ahci_host_priv *hpriv = drv_data->hpriv;
97 err = reset_control_assert(drv_data->pwr);
99 dev_err(&pdev->dev, "unable to pwrdwn\n");
102 ahci_platform_disable_resources(hpriv);
107 static int st_ahci_probe_resets(struct platform_device *pdev)
109 struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
111 drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");
112 if (IS_ERR(drv_data->pwr)) {
113 dev_info(&pdev->dev, "power reset control not defined\n");
114 drv_data->pwr = NULL;
117 drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");
118 if (IS_ERR(drv_data->sw_rst)) {
119 dev_info(&pdev->dev, "soft reset control not defined\n");
120 drv_data->sw_rst = NULL;
123 drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");
124 if (IS_ERR(drv_data->pwr_rst)) {
125 dev_dbg(&pdev->dev, "power soft reset control not defined\n");
126 drv_data->pwr_rst = NULL;
129 return st_ahci_deassert_resets(&pdev->dev);
132 static const struct ata_port_info st_ahci_port_info = {
133 .flags = AHCI_FLAG_COMMON,
134 .pio_mask = ATA_PIO4,
135 .udma_mask = ATA_UDMA6,
136 .port_ops = &ahci_platform_ops,
139 static int st_ahci_probe(struct platform_device *pdev)
141 struct st_ahci_drv_data *drv_data;
142 struct ahci_platform_data *pdata;
143 struct ahci_host_priv *hpriv;
146 drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
150 platform_set_drvdata(pdev, drv_data);
152 pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
156 pdata->exit = st_ahci_exit;
157 pdev->dev.platform_data = pdata;
159 hpriv = ahci_platform_get_resources(pdev);
161 return PTR_ERR(hpriv);
163 drv_data->hpriv = hpriv;
165 err = st_ahci_probe_resets(pdev);
169 err = ahci_platform_enable_resources(hpriv);
173 err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, 0, 0);
175 ahci_platform_disable_resources(hpriv);
182 #ifdef CONFIG_PM_SLEEP
183 static int st_ahci_suspend(struct device *dev)
185 struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
186 struct ahci_host_priv *hpriv = drv_data->hpriv;
190 err = reset_control_assert(drv_data->pwr);
192 dev_err(dev, "unable to pwrdwn");
197 ahci_platform_disable_resources(hpriv);
202 static int st_ahci_resume(struct device *dev)
204 struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
205 struct ahci_host_priv *hpriv = drv_data->hpriv;
208 err = ahci_platform_enable_resources(hpriv);
212 err = st_ahci_deassert_resets(dev);
214 ahci_platform_disable_resources(hpriv);
222 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
224 static struct of_device_id st_ahci_match[] = {
225 { .compatible = "st,ahci", },
228 MODULE_DEVICE_TABLE(of, st_ahci_match);
230 static struct platform_driver st_ahci_driver = {
233 .owner = THIS_MODULE,
234 .pm = &st_ahci_pm_ops,
235 .of_match_table = of_match_ptr(st_ahci_match),
237 .probe = st_ahci_probe,
238 .remove = ata_platform_remove_one,
240 module_platform_driver(st_ahci_driver);
242 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
243 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
244 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
245 MODULE_LICENSE("GPL v2");