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 | |
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(addr: mmio + ST_AHCI_OOBR); |
48 | writel(val: old_val | ST_AHCI_OOBR_WE, addr: mmio + ST_AHCI_OOBR); |
49 | writel(val: new_val | ST_AHCI_OOBR_WE, addr: mmio + ST_AHCI_OOBR); |
50 | writel(val: new_val, addr: 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(rstc: 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(rstc: 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(rstc: 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(rstc: 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, id: "pwr-dwn" ); |
108 | if (IS_ERR(ptr: 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, id: "sw-rst" ); |
114 | if (IS_ERR(ptr: 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, id: "pwr-rst" ); |
120 | if (IS_ERR(ptr: 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(dev: &pdev->dev, size: sizeof(*drv_data), GFP_KERNEL); |
151 | if (!drv_data) |
152 | return -ENOMEM; |
153 | |
154 | hpriv = ahci_platform_get_resources(pdev, flags: 0); |
155 | if (IS_ERR(ptr: hpriv)) |
156 | return PTR_ERR(ptr: hpriv); |
157 | hpriv->plat_data = drv_data; |
158 | |
159 | err = st_ahci_probe_resets(hpriv, dev: &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(mmio: hpriv->mmio); |
168 | |
169 | err = ahci_platform_init_host(pdev, hpriv, pi_template: &st_ahci_port_info, |
170 | sht: &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 |
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(rstc: 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 | |
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(mmio: 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 | |