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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> | |
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 DRV_NAME "st_ahci" | |
27 | ||
28 | #define ST_AHCI_OOBR 0xbc | |
29 | #define ST_AHCI_OOBR_WE BIT(31) | |
30 | #define ST_AHCI_OOBR_CWMIN_SHIFT 24 | |
31 | #define ST_AHCI_OOBR_CWMAX_SHIFT 16 | |
32 | #define ST_AHCI_OOBR_CIMIN_SHIFT 8 | |
33 | #define ST_AHCI_OOBR_CIMAX_SHIFT 0 | |
34 | ||
35 | struct st_ahci_drv_data { | |
36 | struct platform_device *ahci; | |
37 | struct reset_control *pwr; | |
38 | struct reset_control *sw_rst; | |
39 | struct reset_control *pwr_rst; | |
40 | }; | |
41 | ||
42 | static void st_ahci_configure_oob(void __iomem *mmio) | |
43 | { | |
44 | unsigned long old_val, new_val; | |
45 | ||
46 | new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) | | |
47 | (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) | | |
48 | (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) | | |
49 | (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT); | |
50 | ||
51 | old_val = readl(mmio + ST_AHCI_OOBR); | |
52 | writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); | |
53 | writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); | |
54 | writel(new_val, mmio + ST_AHCI_OOBR); | |
55 | } | |
56 | ||
57 | static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv, | |
58 | struct device *dev) | |
59 | { | |
60 | struct st_ahci_drv_data *drv_data = hpriv->plat_data; | |
61 | int err; | |
62 | ||
63 | if (drv_data->pwr) { | |
64 | err = reset_control_deassert(drv_data->pwr); | |
65 | if (err) { | |
66 | dev_err(dev, "unable to bring out of pwrdwn\n"); | |
67 | return err; | |
68 | } | |
69 | } | |
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 | ||
90 | static void st_ahci_host_stop(struct ata_host *host) | |
91 | { | |
92 | struct ahci_host_priv *hpriv = host->private_data; | |
93 | struct st_ahci_drv_data *drv_data = hpriv->plat_data; | |
94 | struct device *dev = host->dev; | |
95 | int err; | |
96 | ||
97 | if (drv_data->pwr) { | |
98 | err = reset_control_assert(drv_data->pwr); | |
99 | if (err) | |
100 | dev_err(dev, "unable to pwrdwn\n"); | |
101 | } | |
102 | ||
103 | ahci_platform_disable_resources(hpriv); | |
104 | } | |
105 | ||
106 | static int st_ahci_probe_resets(struct ahci_host_priv *hpriv, | |
107 | struct device *dev) | |
108 | { | |
109 | struct st_ahci_drv_data *drv_data = hpriv->plat_data; | |
110 | ||
111 | drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn"); | |
112 | if (IS_ERR(drv_data->pwr)) { | |
113 | dev_info(dev, "power reset control not defined\n"); | |
114 | drv_data->pwr = NULL; | |
115 | } | |
116 | ||
117 | drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst"); | |
118 | if (IS_ERR(drv_data->sw_rst)) { | |
119 | dev_info(dev, "soft reset control not defined\n"); | |
120 | drv_data->sw_rst = NULL; | |
121 | } | |
122 | ||
123 | drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst"); | |
124 | if (IS_ERR(drv_data->pwr_rst)) { | |
125 | dev_dbg(dev, "power soft reset control not defined\n"); | |
126 | drv_data->pwr_rst = NULL; | |
127 | } | |
128 | ||
129 | return st_ahci_deassert_resets(hpriv, dev); | |
130 | } | |
131 | ||
132 | static struct ata_port_operations st_ahci_port_ops = { | |
133 | .inherits = &ahci_platform_ops, | |
134 | .host_stop = st_ahci_host_stop, | |
135 | }; | |
136 | ||
137 | static const struct ata_port_info st_ahci_port_info = { | |
138 | .flags = AHCI_FLAG_COMMON, | |
139 | .pio_mask = ATA_PIO4, | |
140 | .udma_mask = ATA_UDMA6, | |
141 | .port_ops = &st_ahci_port_ops, | |
142 | }; | |
143 | ||
144 | static struct scsi_host_template ahci_platform_sht = { | |
145 | AHCI_SHT(DRV_NAME), | |
146 | }; | |
147 | ||
148 | static int st_ahci_probe(struct platform_device *pdev) | |
149 | { | |
150 | struct device *dev = &pdev->dev; | |
151 | struct st_ahci_drv_data *drv_data; | |
152 | struct ahci_host_priv *hpriv; | |
153 | int err; | |
154 | ||
155 | drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL); | |
156 | if (!drv_data) | |
157 | return -ENOMEM; | |
158 | ||
159 | hpriv = ahci_platform_get_resources(pdev); | |
160 | if (IS_ERR(hpriv)) | |
161 | return PTR_ERR(hpriv); | |
162 | hpriv->plat_data = drv_data; | |
163 | ||
164 | err = st_ahci_probe_resets(hpriv, &pdev->dev); | |
165 | if (err) | |
166 | return err; | |
167 | ||
168 | err = ahci_platform_enable_resources(hpriv); | |
169 | if (err) | |
170 | return err; | |
171 | ||
172 | st_ahci_configure_oob(hpriv->mmio); | |
173 | ||
174 | of_property_read_u32(dev->of_node, | |
175 | "ports-implemented", &hpriv->force_port_map); | |
176 | ||
177 | err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, | |
178 | &ahci_platform_sht); | |
179 | if (err) { | |
180 | ahci_platform_disable_resources(hpriv); | |
181 | return err; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | #ifdef CONFIG_PM_SLEEP | |
188 | static int st_ahci_suspend(struct device *dev) | |
189 | { | |
190 | struct ata_host *host = dev_get_drvdata(dev); | |
191 | struct ahci_host_priv *hpriv = host->private_data; | |
192 | struct st_ahci_drv_data *drv_data = hpriv->plat_data; | |
193 | int err; | |
194 | ||
195 | err = ahci_platform_suspend_host(dev); | |
196 | if (err) | |
197 | return err; | |
198 | ||
199 | if (drv_data->pwr) { | |
200 | err = reset_control_assert(drv_data->pwr); | |
201 | if (err) { | |
202 | dev_err(dev, "unable to pwrdwn"); | |
203 | return err; | |
204 | } | |
205 | } | |
206 | ||
207 | ahci_platform_disable_resources(hpriv); | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static int st_ahci_resume(struct device *dev) | |
213 | { | |
214 | struct ata_host *host = dev_get_drvdata(dev); | |
215 | struct ahci_host_priv *hpriv = host->private_data; | |
216 | int err; | |
217 | ||
218 | err = ahci_platform_enable_resources(hpriv); | |
219 | if (err) | |
220 | return err; | |
221 | ||
222 | err = st_ahci_deassert_resets(hpriv, dev); | |
223 | if (err) { | |
224 | ahci_platform_disable_resources(hpriv); | |
225 | return err; | |
226 | } | |
227 | ||
228 | st_ahci_configure_oob(hpriv->mmio); | |
229 | ||
230 | return ahci_platform_resume_host(dev); | |
231 | } | |
232 | #endif | |
233 | ||
234 | static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume); | |
235 | ||
236 | static const struct of_device_id st_ahci_match[] = { | |
237 | { .compatible = "st,ahci", }, | |
238 | {}, | |
239 | }; | |
240 | MODULE_DEVICE_TABLE(of, st_ahci_match); | |
241 | ||
242 | static struct platform_driver st_ahci_driver = { | |
243 | .driver = { | |
244 | .name = DRV_NAME, | |
245 | .pm = &st_ahci_pm_ops, | |
246 | .of_match_table = of_match_ptr(st_ahci_match), | |
247 | }, | |
248 | .probe = st_ahci_probe, | |
249 | .remove = ata_platform_remove_one, | |
250 | }; | |
251 | module_platform_driver(st_ahci_driver); | |
252 | ||
253 | MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>"); | |
254 | MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>"); | |
255 | MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver"); | |
256 | MODULE_LICENSE("GPL v2"); |