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76884cb2 LJ |
1 | /* |
2 | * Copyright (C) 2012 STMicroelectronics Limited | |
3 | * | |
4 | * Authors: Francesco Virlinzi <francesco.virlinzi@st.com> | |
5 | * Alexandre Torgue <alexandre.torgue@st.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | ||
12 | #include <linux/init.h> | |
13 | #include <linux/module.h> | |
14 | #include <linux/export.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/clk.h> | |
17 | #include <linux/of.h> | |
18 | #include <linux/ahci_platform.h> | |
76884cb2 LJ |
19 | #include <linux/libata.h> |
20 | #include <linux/reset.h> | |
21 | #include <linux/io.h> | |
22 | #include <linux/dma-mapping.h> | |
23 | ||
24 | #include "ahci.h" | |
25 | ||
26 | #define ST_AHCI_OOBR 0xbc | |
27 | #define ST_AHCI_OOBR_WE BIT(31) | |
28 | #define ST_AHCI_OOBR_CWMIN_SHIFT 24 | |
29 | #define ST_AHCI_OOBR_CWMAX_SHIFT 16 | |
30 | #define ST_AHCI_OOBR_CIMIN_SHIFT 8 | |
31 | #define ST_AHCI_OOBR_CIMAX_SHIFT 0 | |
32 | ||
33 | struct st_ahci_drv_data { | |
34 | struct platform_device *ahci; | |
76884cb2 LJ |
35 | struct reset_control *pwr; |
36 | struct reset_control *sw_rst; | |
37 | struct reset_control *pwr_rst; | |
38 | struct ahci_host_priv *hpriv; | |
39 | }; | |
40 | ||
41 | static void st_ahci_configure_oob(void __iomem *mmio) | |
42 | { | |
43 | unsigned long old_val, new_val; | |
44 | ||
45 | new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) | | |
46 | (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) | | |
47 | (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) | | |
48 | (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT); | |
49 | ||
50 | old_val = readl(mmio + ST_AHCI_OOBR); | |
51 | writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); | |
52 | writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); | |
53 | writel(new_val, mmio + ST_AHCI_OOBR); | |
54 | } | |
55 | ||
56 | static int st_ahci_deassert_resets(struct device *dev) | |
57 | { | |
58 | struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev); | |
59 | int err; | |
60 | ||
61 | if (drv_data->pwr) { | |
62 | err = reset_control_deassert(drv_data->pwr); | |
63 | if (err) { | |
64 | dev_err(dev, "unable to bring out of pwrdwn\n"); | |
65 | return err; | |
66 | } | |
67 | } | |
68 | ||
69 | st_ahci_configure_oob(drv_data->hpriv->mmio); | |
70 | ||
71 | if (drv_data->sw_rst) { | |
72 | err = reset_control_deassert(drv_data->sw_rst); | |
73 | if (err) { | |
74 | dev_err(dev, "unable to bring out of sw-rst\n"); | |
75 | return err; | |
76 | } | |
77 | } | |
78 | ||
79 | if (drv_data->pwr_rst) { | |
80 | err = reset_control_deassert(drv_data->pwr_rst); | |
81 | if (err) { | |
82 | dev_err(dev, "unable to bring out of pwr-rst\n"); | |
83 | return err; | |
84 | } | |
85 | } | |
86 | ||
87 | return 0; | |
88 | } | |
89 | ||
b032378b | 90 | static void st_ahci_host_stop(struct ata_host *host) |
a8237084 | 91 | { |
b032378b BZ |
92 | struct ahci_host_priv *hpriv = host->private_data; |
93 | struct device *dev = host->dev; | |
a8237084 | 94 | struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev); |
a8237084 LJ |
95 | int err; |
96 | ||
97 | if (drv_data->pwr) { | |
98 | err = reset_control_assert(drv_data->pwr); | |
99 | if (err) | |
33081b34 | 100 | dev_err(dev, "unable to pwrdwn\n"); |
a8237084 LJ |
101 | } |
102 | ||
103 | ahci_platform_disable_resources(hpriv); | |
a8237084 LJ |
104 | } |
105 | ||
76884cb2 LJ |
106 | static int st_ahci_probe_resets(struct platform_device *pdev) |
107 | { | |
108 | struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev); | |
109 | ||
110 | drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn"); | |
111 | if (IS_ERR(drv_data->pwr)) { | |
112 | dev_info(&pdev->dev, "power reset control not defined\n"); | |
113 | drv_data->pwr = NULL; | |
114 | } | |
115 | ||
116 | drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst"); | |
117 | if (IS_ERR(drv_data->sw_rst)) { | |
118 | dev_info(&pdev->dev, "soft reset control not defined\n"); | |
119 | drv_data->sw_rst = NULL; | |
120 | } | |
121 | ||
122 | drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst"); | |
123 | if (IS_ERR(drv_data->pwr_rst)) { | |
124 | dev_dbg(&pdev->dev, "power soft reset control not defined\n"); | |
125 | drv_data->pwr_rst = NULL; | |
126 | } | |
127 | ||
128 | return st_ahci_deassert_resets(&pdev->dev); | |
129 | } | |
130 | ||
b032378b BZ |
131 | static struct ata_port_operations st_ahci_port_ops = { |
132 | .inherits = &ahci_platform_ops, | |
133 | .host_stop = st_ahci_host_stop, | |
134 | }; | |
135 | ||
76884cb2 LJ |
136 | static const struct ata_port_info st_ahci_port_info = { |
137 | .flags = AHCI_FLAG_COMMON, | |
138 | .pio_mask = ATA_PIO4, | |
139 | .udma_mask = ATA_UDMA6, | |
b032378b | 140 | .port_ops = &st_ahci_port_ops, |
76884cb2 LJ |
141 | }; |
142 | ||
143 | static int st_ahci_probe(struct platform_device *pdev) | |
144 | { | |
145 | struct st_ahci_drv_data *drv_data; | |
146 | struct ahci_host_priv *hpriv; | |
147 | int err; | |
148 | ||
149 | drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL); | |
150 | if (!drv_data) | |
151 | return -ENOMEM; | |
152 | ||
153 | platform_set_drvdata(pdev, drv_data); | |
154 | ||
155 | hpriv = ahci_platform_get_resources(pdev); | |
156 | if (IS_ERR(hpriv)) | |
157 | return PTR_ERR(hpriv); | |
158 | ||
159 | drv_data->hpriv = hpriv; | |
160 | ||
161 | err = st_ahci_probe_resets(pdev); | |
162 | if (err) | |
163 | return err; | |
164 | ||
165 | err = ahci_platform_enable_resources(hpriv); | |
166 | if (err) | |
167 | return err; | |
168 | ||
725c7b57 | 169 | err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info); |
76884cb2 LJ |
170 | if (err) { |
171 | ahci_platform_disable_resources(hpriv); | |
172 | return err; | |
173 | } | |
174 | ||
175 | return 0; | |
176 | } | |
177 | ||
76884cb2 LJ |
178 | #ifdef CONFIG_PM_SLEEP |
179 | static int st_ahci_suspend(struct device *dev) | |
180 | { | |
181 | struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev); | |
182 | struct ahci_host_priv *hpriv = drv_data->hpriv; | |
183 | int err; | |
184 | ||
33081b34 BZ |
185 | err = ahci_platform_suspend_host(dev); |
186 | if (err) | |
187 | return err; | |
761a8c27 | 188 | |
76884cb2 LJ |
189 | if (drv_data->pwr) { |
190 | err = reset_control_assert(drv_data->pwr); | |
191 | if (err) { | |
192 | dev_err(dev, "unable to pwrdwn"); | |
193 | return err; | |
194 | } | |
195 | } | |
196 | ||
197 | ahci_platform_disable_resources(hpriv); | |
198 | ||
199 | return 0; | |
200 | } | |
201 | ||
202 | static int st_ahci_resume(struct device *dev) | |
203 | { | |
204 | struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev); | |
205 | struct ahci_host_priv *hpriv = drv_data->hpriv; | |
206 | int err; | |
207 | ||
208 | err = ahci_platform_enable_resources(hpriv); | |
209 | if (err) | |
210 | return err; | |
211 | ||
212 | err = st_ahci_deassert_resets(dev); | |
213 | if (err) { | |
214 | ahci_platform_disable_resources(hpriv); | |
215 | return err; | |
216 | } | |
217 | ||
761a8c27 | 218 | return ahci_platform_resume_host(dev); |
76884cb2 LJ |
219 | } |
220 | #endif | |
221 | ||
222 | static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume); | |
223 | ||
09de99db | 224 | static const struct of_device_id st_ahci_match[] = { |
76884cb2 LJ |
225 | { .compatible = "st,ahci", }, |
226 | {}, | |
227 | }; | |
228 | MODULE_DEVICE_TABLE(of, st_ahci_match); | |
229 | ||
230 | static struct platform_driver st_ahci_driver = { | |
231 | .driver = { | |
232 | .name = "st_ahci", | |
76884cb2 LJ |
233 | .pm = &st_ahci_pm_ops, |
234 | .of_match_table = of_match_ptr(st_ahci_match), | |
235 | }, | |
236 | .probe = st_ahci_probe, | |
a8237084 | 237 | .remove = ata_platform_remove_one, |
76884cb2 LJ |
238 | }; |
239 | module_platform_driver(st_ahci_driver); | |
240 | ||
241 | MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>"); | |
242 | MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>"); | |
4a2e5123 | 243 | MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver"); |
76884cb2 | 244 | MODULE_LICENSE("GPL v2"); |