1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 STMicroelectronics Limited
4 *
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 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
31
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;
37 };
38
st_ahci_configure_oob(void __iomem * mmio)39 static void st_ahci_configure_oob(void __iomem *mmio)
40 {
41 unsigned long old_val, new_val;
42
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);
47
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);
52 }
53
st_ahci_deassert_resets(struct ahci_host_priv * hpriv,struct device * dev)54 static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv,
55 struct device *dev)
56 {
57 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
58 int err;
59
60 if (drv_data->pwr) {
61 err = reset_control_deassert(drv_data->pwr);
62 if (err) {
63 dev_err(dev, "unable to bring out of pwrdwn\n");
64 return err;
65 }
66 }
67
68 if (drv_data->sw_rst) {
69 err = reset_control_deassert(drv_data->sw_rst);
70 if (err) {
71 dev_err(dev, "unable to bring out of sw-rst\n");
72 return err;
73 }
74 }
75
76 if (drv_data->pwr_rst) {
77 err = reset_control_deassert(drv_data->pwr_rst);
78 if (err) {
79 dev_err(dev, "unable to bring out of pwr-rst\n");
80 return err;
81 }
82 }
83
84 return 0;
85 }
86
st_ahci_host_stop(struct ata_host * host)87 static void st_ahci_host_stop(struct ata_host *host)
88 {
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;
92 int err;
93
94 if (drv_data->pwr) {
95 err = reset_control_assert(drv_data->pwr);
96 if (err)
97 dev_err(dev, "unable to pwrdwn\n");
98 }
99
100 ahci_platform_disable_resources(hpriv);
101 }
102
st_ahci_probe_resets(struct ahci_host_priv * hpriv,struct device * dev)103 static int st_ahci_probe_resets(struct ahci_host_priv *hpriv,
104 struct device *dev)
105 {
106 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
107
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;
112 }
113
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;
118 }
119
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;
124 }
125
126 return st_ahci_deassert_resets(hpriv, dev);
127 }
128
129 static struct ata_port_operations st_ahci_port_ops = {
130 .inherits = &ahci_platform_ops,
131 .host_stop = st_ahci_host_stop,
132 };
133
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,
139 };
140
141 static struct scsi_host_template ahci_platform_sht = {
142 AHCI_SHT(DRV_NAME),
143 };
144
st_ahci_probe(struct platform_device * pdev)145 static int st_ahci_probe(struct platform_device *pdev)
146 {
147 struct device *dev = &pdev->dev;
148 struct st_ahci_drv_data *drv_data;
149 struct ahci_host_priv *hpriv;
150 int err;
151
152 drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
153 if (!drv_data)
154 return -ENOMEM;
155
156 hpriv = ahci_platform_get_resources(pdev, 0);
157 if (IS_ERR(hpriv))
158 return PTR_ERR(hpriv);
159 hpriv->plat_data = drv_data;
160
161 err = st_ahci_probe_resets(hpriv, &pdev->dev);
162 if (err)
163 return err;
164
165 err = ahci_platform_enable_resources(hpriv);
166 if (err)
167 return err;
168
169 st_ahci_configure_oob(hpriv->mmio);
170
171 of_property_read_u32(dev->of_node,
172 "ports-implemented", &hpriv->force_port_map);
173
174 err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
175 &ahci_platform_sht);
176 if (err) {
177 ahci_platform_disable_resources(hpriv);
178 return err;
179 }
180
181 return 0;
182 }
183
184 #ifdef CONFIG_PM_SLEEP
st_ahci_suspend(struct device * dev)185 static int st_ahci_suspend(struct device *dev)
186 {
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;
190 int err;
191
192 err = ahci_platform_suspend_host(dev);
193 if (err)
194 return err;
195
196 if (drv_data->pwr) {
197 err = reset_control_assert(drv_data->pwr);
198 if (err) {
199 dev_err(dev, "unable to pwrdwn");
200 return err;
201 }
202 }
203
204 ahci_platform_disable_resources(hpriv);
205
206 return 0;
207 }
208
st_ahci_resume(struct device * dev)209 static int st_ahci_resume(struct device *dev)
210 {
211 struct ata_host *host = dev_get_drvdata(dev);
212 struct ahci_host_priv *hpriv = host->private_data;
213 int err;
214
215 err = ahci_platform_enable_resources(hpriv);
216 if (err)
217 return err;
218
219 err = st_ahci_deassert_resets(hpriv, dev);
220 if (err) {
221 ahci_platform_disable_resources(hpriv);
222 return err;
223 }
224
225 st_ahci_configure_oob(hpriv->mmio);
226
227 return ahci_platform_resume_host(dev);
228 }
229 #endif
230
231 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
232
233 static const struct of_device_id st_ahci_match[] = {
234 { .compatible = "st,ahci", },
235 {},
236 };
237 MODULE_DEVICE_TABLE(of, st_ahci_match);
238
239 static struct platform_driver st_ahci_driver = {
240 .driver = {
241 .name = DRV_NAME,
242 .pm = &st_ahci_pm_ops,
243 .of_match_table = of_match_ptr(st_ahci_match),
244 },
245 .probe = st_ahci_probe,
246 .remove = ata_platform_remove_one,
247 };
248 module_platform_driver(st_ahci_driver);
249
250 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
251 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
252 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
253 MODULE_LICENSE("GPL v2");
254