Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
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
32struct st_ahci_drv_data {
33 struct reset_control *pwr;
34 struct reset_control *sw_rst;
35 struct reset_control *pwr_rst;
36};
37
38static 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
53static 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
86static 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
102static 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
128static struct ata_port_operations st_ahci_port_ops = {
129 .inherits = &ahci_platform_ops,
130 .host_stop = st_ahci_host_stop,
131};
132
133static 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
140static const struct scsi_host_template ahci_platform_sht = {
141 AHCI_SHT(DRV_NAME),
142};
143
144static 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
179static 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
203static 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
224static DEFINE_SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
225
226static const struct of_device_id st_ahci_match[] = {
227 { .compatible = "st,ahci", },
228 { /* sentinel */ }
229};
230MODULE_DEVICE_TABLE(of, st_ahci_match);
231
232static 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};
241module_platform_driver(st_ahci_driver);
242
243MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
244MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
245MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
246MODULE_LICENSE("GPL v2");