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[linux.git] / drivers / ata / ahci_st.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2012 STMicroelectronics Limited
4  *
5  * Authors: Francesco Virlinzi <[email protected]>
6  *          Alexandre Torgue <[email protected]>
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
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
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
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
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
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 static int st_ahci_suspend(struct device *dev)
180 {
181         struct ata_host *host = dev_get_drvdata(dev);
182         struct ahci_host_priv *hpriv = host->private_data;
183         struct st_ahci_drv_data *drv_data = hpriv->plat_data;
184         int err;
185
186         err = ahci_platform_suspend_host(dev);
187         if (err)
188                 return err;
189
190         if (drv_data->pwr) {
191                 err = reset_control_assert(drv_data->pwr);
192                 if (err) {
193                         dev_err(dev, "unable to pwrdwn");
194                         return err;
195                 }
196         }
197
198         ahci_platform_disable_resources(hpriv);
199
200         return 0;
201 }
202
203 static int st_ahci_resume(struct device *dev)
204 {
205         struct ata_host *host = dev_get_drvdata(dev);
206         struct ahci_host_priv *hpriv = host->private_data;
207         int err;
208
209         err = ahci_platform_enable_resources(hpriv);
210         if (err)
211                 return err;
212
213         err = st_ahci_deassert_resets(hpriv, dev);
214         if (err) {
215                 ahci_platform_disable_resources(hpriv);
216                 return err;
217         }
218
219         st_ahci_configure_oob(hpriv->mmio);
220
221         return ahci_platform_resume_host(dev);
222 }
223
224 static DEFINE_SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
225
226 static const struct of_device_id st_ahci_match[] = {
227         { .compatible = "st,ahci", },
228         { /* sentinel */ }
229 };
230 MODULE_DEVICE_TABLE(of, st_ahci_match);
231
232 static struct platform_driver st_ahci_driver = {
233         .driver = {
234                 .name = DRV_NAME,
235                 .pm = pm_sleep_ptr(&st_ahci_pm_ops),
236                 .of_match_table = st_ahci_match,
237         },
238         .probe = st_ahci_probe,
239         .remove = ata_platform_remove_one,
240 };
241 module_platform_driver(st_ahci_driver);
242
243 MODULE_AUTHOR("Alexandre Torgue <[email protected]>");
244 MODULE_AUTHOR("Francesco Virlinzi <[email protected]>");
245 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
246 MODULE_LICENSE("GPL v2");
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