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
st_ahci_configure_oob(void __iomem * mmio)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
st_ahci_deassert_resets(struct ahci_host_priv * hpriv,struct device * dev)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
st_ahci_host_stop(struct ata_host * host)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
st_ahci_probe_resets(struct ahci_host_priv * hpriv,struct device * dev)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
st_ahci_probe(struct platform_device * pdev)148 static int st_ahci_probe(struct platform_device *pdev)
149 {
150 struct device *dev = &pdev->dev;
151 struct st_ahci_drv_data *drv_data;
152 struct ahci_host_priv *hpriv;
153 int err;
154
155 drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
156 if (!drv_data)
157 return -ENOMEM;
158
159 hpriv = ahci_platform_get_resources(pdev, 0);
160 if (IS_ERR(hpriv))
161 return PTR_ERR(hpriv);
162 hpriv->plat_data = drv_data;
163
164 err = st_ahci_probe_resets(hpriv, &pdev->dev);
165 if (err)
166 return err;
167
168 err = ahci_platform_enable_resources(hpriv);
169 if (err)
170 return err;
171
172 st_ahci_configure_oob(hpriv->mmio);
173
174 of_property_read_u32(dev->of_node,
175 "ports-implemented", &hpriv->force_port_map);
176
177 err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
178 &ahci_platform_sht);
179 if (err) {
180 ahci_platform_disable_resources(hpriv);
181 return err;
182 }
183
184 return 0;
185 }
186
187 #ifdef CONFIG_PM_SLEEP
st_ahci_suspend(struct device * dev)188 static int st_ahci_suspend(struct device *dev)
189 {
190 struct ata_host *host = dev_get_drvdata(dev);
191 struct ahci_host_priv *hpriv = host->private_data;
192 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
193 int err;
194
195 err = ahci_platform_suspend_host(dev);
196 if (err)
197 return err;
198
199 if (drv_data->pwr) {
200 err = reset_control_assert(drv_data->pwr);
201 if (err) {
202 dev_err(dev, "unable to pwrdwn");
203 return err;
204 }
205 }
206
207 ahci_platform_disable_resources(hpriv);
208
209 return 0;
210 }
211
st_ahci_resume(struct device * dev)212 static int st_ahci_resume(struct device *dev)
213 {
214 struct ata_host *host = dev_get_drvdata(dev);
215 struct ahci_host_priv *hpriv = host->private_data;
216 int err;
217
218 err = ahci_platform_enable_resources(hpriv);
219 if (err)
220 return err;
221
222 err = st_ahci_deassert_resets(hpriv, dev);
223 if (err) {
224 ahci_platform_disable_resources(hpriv);
225 return err;
226 }
227
228 st_ahci_configure_oob(hpriv->mmio);
229
230 return ahci_platform_resume_host(dev);
231 }
232 #endif
233
234 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
235
236 static const struct of_device_id st_ahci_match[] = {
237 { .compatible = "st,ahci", },
238 {},
239 };
240 MODULE_DEVICE_TABLE(of, st_ahci_match);
241
242 static struct platform_driver st_ahci_driver = {
243 .driver = {
244 .name = DRV_NAME,
245 .pm = &st_ahci_pm_ops,
246 .of_match_table = of_match_ptr(st_ahci_match),
247 },
248 .probe = st_ahci_probe,
249 .remove = ata_platform_remove_one,
250 };
251 module_platform_driver(st_ahci_driver);
252
253 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
254 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
255 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
256 MODULE_LICENSE("GPL v2");
257
