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 reset_control *pwr;
34 struct reset_control *sw_rst;
35 struct reset_control *pwr_rst;
36 };
37
st_ahci_configure_oob(void __iomem * mmio)38 static void st_ahci_configure_oob(void __iomem *mmio)
39 {
40 unsigned long old_val, new_val;
41
42 new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
43 (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
44 (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
45 (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
46
47 old_val = readl(mmio + ST_AHCI_OOBR);
48 writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
49 writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
50 writel(new_val, mmio + ST_AHCI_OOBR);
51 }
52
st_ahci_deassert_resets(struct ahci_host_priv * hpriv,struct device * dev)53 static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv,
54 struct device *dev)
55 {
56 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
57 int err;
58
59 if (drv_data->pwr) {
60 err = reset_control_deassert(drv_data->pwr);
61 if (err) {
62 dev_err(dev, "unable to bring out of pwrdwn\n");
63 return err;
64 }
65 }
66
67 if (drv_data->sw_rst) {
68 err = reset_control_deassert(drv_data->sw_rst);
69 if (err) {
70 dev_err(dev, "unable to bring out of sw-rst\n");
71 return err;
72 }
73 }
74
75 if (drv_data->pwr_rst) {
76 err = reset_control_deassert(drv_data->pwr_rst);
77 if (err) {
78 dev_err(dev, "unable to bring out of pwr-rst\n");
79 return err;
80 }
81 }
82
83 return 0;
84 }
85
st_ahci_host_stop(struct ata_host * host)86 static void st_ahci_host_stop(struct ata_host *host)
87 {
88 struct ahci_host_priv *hpriv = host->private_data;
89 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
90 struct device *dev = host->dev;
91 int err;
92
93 if (drv_data->pwr) {
94 err = reset_control_assert(drv_data->pwr);
95 if (err)
96 dev_err(dev, "unable to pwrdwn\n");
97 }
98
99 ahci_platform_disable_resources(hpriv);
100 }
101
st_ahci_probe_resets(struct ahci_host_priv * hpriv,struct device * dev)102 static int st_ahci_probe_resets(struct ahci_host_priv *hpriv,
103 struct device *dev)
104 {
105 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
106
107 drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn");
108 if (IS_ERR(drv_data->pwr)) {
109 dev_info(dev, "power reset control not defined\n");
110 drv_data->pwr = NULL;
111 }
112
113 drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst");
114 if (IS_ERR(drv_data->sw_rst)) {
115 dev_info(dev, "soft reset control not defined\n");
116 drv_data->sw_rst = NULL;
117 }
118
119 drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst");
120 if (IS_ERR(drv_data->pwr_rst)) {
121 dev_dbg(dev, "power soft reset control not defined\n");
122 drv_data->pwr_rst = NULL;
123 }
124
125 return st_ahci_deassert_resets(hpriv, dev);
126 }
127
128 static struct ata_port_operations st_ahci_port_ops = {
129 .inherits = &ahci_platform_ops,
130 .host_stop = st_ahci_host_stop,
131 };
132
133 static const struct ata_port_info st_ahci_port_info = {
134 .flags = AHCI_FLAG_COMMON,
135 .pio_mask = ATA_PIO4,
136 .udma_mask = ATA_UDMA6,
137 .port_ops = &st_ahci_port_ops,
138 };
139
140 static const struct scsi_host_template ahci_platform_sht = {
141 AHCI_SHT(DRV_NAME),
142 };
143
st_ahci_probe(struct platform_device * pdev)144 static int st_ahci_probe(struct platform_device *pdev)
145 {
146 struct st_ahci_drv_data *drv_data;
147 struct ahci_host_priv *hpriv;
148 int err;
149
150 drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
151 if (!drv_data)
152 return -ENOMEM;
153
154 hpriv = ahci_platform_get_resources(pdev, 0);
155 if (IS_ERR(hpriv))
156 return PTR_ERR(hpriv);
157 hpriv->plat_data = drv_data;
158
159 err = st_ahci_probe_resets(hpriv, &pdev->dev);
160 if (err)
161 return err;
162
163 err = ahci_platform_enable_resources(hpriv);
164 if (err)
165 return err;
166
167 st_ahci_configure_oob(hpriv->mmio);
168
169 err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
170 &ahci_platform_sht);
171 if (err) {
172 ahci_platform_disable_resources(hpriv);
173 return err;
174 }
175
176 return 0;
177 }
178
179 #ifdef CONFIG_PM_SLEEP
st_ahci_suspend(struct device * dev)180 static int st_ahci_suspend(struct device *dev)
181 {
182 struct ata_host *host = dev_get_drvdata(dev);
183 struct ahci_host_priv *hpriv = host->private_data;
184 struct st_ahci_drv_data *drv_data = hpriv->plat_data;
185 int err;
186
187 err = ahci_platform_suspend_host(dev);
188 if (err)
189 return err;
190
191 if (drv_data->pwr) {
192 err = reset_control_assert(drv_data->pwr);
193 if (err) {
194 dev_err(dev, "unable to pwrdwn");
195 return err;
196 }
197 }
198
199 ahci_platform_disable_resources(hpriv);
200
201 return 0;
202 }
203
st_ahci_resume(struct device * dev)204 static int st_ahci_resume(struct device *dev)
205 {
206 struct ata_host *host = dev_get_drvdata(dev);
207 struct ahci_host_priv *hpriv = host->private_data;
208 int err;
209
210 err = ahci_platform_enable_resources(hpriv);
211 if (err)
212 return err;
213
214 err = st_ahci_deassert_resets(hpriv, dev);
215 if (err) {
216 ahci_platform_disable_resources(hpriv);
217 return err;
218 }
219
220 st_ahci_configure_oob(hpriv->mmio);
221
222 return ahci_platform_resume_host(dev);
223 }
224 #endif
225
226 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
227
228 static const struct of_device_id st_ahci_match[] = {
229 { .compatible = "st,ahci", },
230 { /* sentinel */ }
231 };
232 MODULE_DEVICE_TABLE(of, st_ahci_match);
233
234 static struct platform_driver st_ahci_driver = {
235 .driver = {
236 .name = DRV_NAME,
237 .pm = &st_ahci_pm_ops,
238 .of_match_table = st_ahci_match,
239 },
240 .probe = st_ahci_probe,
241 .remove_new = ata_platform_remove_one,
242 };
243 module_platform_driver(st_ahci_driver);
244
245 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
246 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
247 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
248 MODULE_LICENSE("GPL v2");
249