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