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15#include <linux/clk.h>
16#include <linux/kernel.h>
17#include <linux/gfp.h>
18#include <linux/module.h>
19#include <linux/pm.h>
20#include <linux/init.h>
21#include <linux/interrupt.h>
22#include <linux/device.h>
23#include <linux/platform_device.h>
24#include <linux/libata.h>
25#include <linux/ahci_platform.h>
26#include "ahci.h"
27
28static void ahci_host_stop(struct ata_host *host);
29
30enum ahci_type {
31 AHCI,
32 IMX53_AHCI,
33 STRICT_AHCI,
34};
35
36static struct platform_device_id ahci_devtype[] = {
37 {
38 .name = "ahci",
39 .driver_data = AHCI,
40 }, {
41 .name = "imx53-ahci",
42 .driver_data = IMX53_AHCI,
43 }, {
44 .name = "strict-ahci",
45 .driver_data = STRICT_AHCI,
46 }, {
47
48 }
49};
50MODULE_DEVICE_TABLE(platform, ahci_devtype);
51
52static struct ata_port_operations ahci_platform_ops = {
53 .inherits = &ahci_ops,
54 .host_stop = ahci_host_stop,
55};
56
57static struct ata_port_operations ahci_platform_retry_srst_ops = {
58 .inherits = &ahci_pmp_retry_srst_ops,
59 .host_stop = ahci_host_stop,
60};
61
62static const struct ata_port_info ahci_port_info[] = {
63
64 [AHCI] = {
65 .flags = AHCI_FLAG_COMMON,
66 .pio_mask = ATA_PIO4,
67 .udma_mask = ATA_UDMA6,
68 .port_ops = &ahci_platform_ops,
69 },
70 [IMX53_AHCI] = {
71 .flags = AHCI_FLAG_COMMON,
72 .pio_mask = ATA_PIO4,
73 .udma_mask = ATA_UDMA6,
74 .port_ops = &ahci_platform_retry_srst_ops,
75 },
76 [STRICT_AHCI] = {
77 AHCI_HFLAGS (AHCI_HFLAG_DELAY_ENGINE),
78 .flags = AHCI_FLAG_COMMON,
79 .pio_mask = ATA_PIO4,
80 .udma_mask = ATA_UDMA6,
81 .port_ops = &ahci_platform_ops,
82 },
83};
84
85static struct scsi_host_template ahci_platform_sht = {
86 AHCI_SHT("ahci_platform"),
87};
88
89static int ahci_probe(struct platform_device *pdev)
90{
91 struct device *dev = &pdev->dev;
92 struct ahci_platform_data *pdata = dev_get_platdata(dev);
93 const struct platform_device_id *id = platform_get_device_id(pdev);
94 struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
95 const struct ata_port_info *ppi[] = { &pi, NULL };
96 struct ahci_host_priv *hpriv;
97 struct ata_host *host;
98 struct resource *mem;
99 int irq;
100 int n_ports;
101 int i;
102 int rc;
103
104 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
105 if (!mem) {
106 dev_err(dev, "no mmio space\n");
107 return -EINVAL;
108 }
109
110 irq = platform_get_irq(pdev, 0);
111 if (irq <= 0) {
112 dev_err(dev, "no irq\n");
113 return -EINVAL;
114 }
115
116 if (pdata && pdata->ata_port_info)
117 pi = *pdata->ata_port_info;
118
119 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
120 if (!hpriv) {
121 dev_err(dev, "can't alloc ahci_host_priv\n");
122 return -ENOMEM;
123 }
124
125 hpriv->flags |= (unsigned long)pi.private_data;
126
127 hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
128 if (!hpriv->mmio) {
129 dev_err(dev, "can't map %pR\n", mem);
130 return -ENOMEM;
131 }
132
133 hpriv->clk = clk_get(dev, NULL);
134 if (IS_ERR(hpriv->clk)) {
135 dev_err(dev, "can't get clock\n");
136 } else {
137 rc = clk_prepare_enable(hpriv->clk);
138 if (rc) {
139 dev_err(dev, "clock prepare enable failed");
140 goto free_clk;
141 }
142 }
143
144
145
146
147
148
149
150 if (pdata && pdata->init) {
151 rc = pdata->init(dev, hpriv->mmio);
152 if (rc)
153 goto disable_unprepare_clk;
154 }
155
156 ahci_save_initial_config(dev, hpriv,
157 pdata ? pdata->force_port_map : 0,
158 pdata ? pdata->mask_port_map : 0);
159
160
161 if (hpriv->cap & HOST_CAP_NCQ)
162 pi.flags |= ATA_FLAG_NCQ;
163
164 if (hpriv->cap & HOST_CAP_PMP)
165 pi.flags |= ATA_FLAG_PMP;
166
167 ahci_set_em_messages(hpriv, &pi);
168
169
170
171
172
173
174 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
175
176 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
177 if (!host) {
178 rc = -ENOMEM;
179 goto pdata_exit;
180 }
181
182 host->private_data = hpriv;
183
184 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
185 host->flags |= ATA_HOST_PARALLEL_SCAN;
186 else
187 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
188
189 if (pi.flags & ATA_FLAG_EM)
190 ahci_reset_em(host);
191
192 for (i = 0; i < host->n_ports; i++) {
193 struct ata_port *ap = host->ports[i];
194
195 ata_port_desc(ap, "mmio %pR", mem);
196 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
197
198
199 if (ap->flags & ATA_FLAG_EM)
200 ap->em_message_type = hpriv->em_msg_type;
201
202
203 if (!(hpriv->port_map & (1 << i)))
204 ap->ops = &ata_dummy_port_ops;
205 }
206
207 rc = ahci_reset_controller(host);
208 if (rc)
209 goto pdata_exit;
210
211 ahci_init_controller(host);
212 ahci_print_info(host, "platform");
213
214 rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
215 &ahci_platform_sht);
216 if (rc)
217 goto pdata_exit;
218
219 return 0;
220pdata_exit:
221 if (pdata && pdata->exit)
222 pdata->exit(dev);
223disable_unprepare_clk:
224 if (!IS_ERR(hpriv->clk))
225 clk_disable_unprepare(hpriv->clk);
226free_clk:
227 if (!IS_ERR(hpriv->clk))
228 clk_put(hpriv->clk);
229 return rc;
230}
231
232static void ahci_host_stop(struct ata_host *host)
233{
234 struct device *dev = host->dev;
235 struct ahci_platform_data *pdata = dev_get_platdata(dev);
236 struct ahci_host_priv *hpriv = host->private_data;
237
238 if (pdata && pdata->exit)
239 pdata->exit(dev);
240
241 if (!IS_ERR(hpriv->clk)) {
242 clk_disable_unprepare(hpriv->clk);
243 clk_put(hpriv->clk);
244 }
245}
246
247#ifdef CONFIG_PM_SLEEP
248static int ahci_suspend(struct device *dev)
249{
250 struct ahci_platform_data *pdata = dev_get_platdata(dev);
251 struct ata_host *host = dev_get_drvdata(dev);
252 struct ahci_host_priv *hpriv = host->private_data;
253 void __iomem *mmio = hpriv->mmio;
254 u32 ctl;
255 int rc;
256
257 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
258 dev_err(dev, "firmware update required for suspend/resume\n");
259 return -EIO;
260 }
261
262
263
264
265
266
267 ctl = readl(mmio + HOST_CTL);
268 ctl &= ~HOST_IRQ_EN;
269 writel(ctl, mmio + HOST_CTL);
270 readl(mmio + HOST_CTL);
271
272 rc = ata_host_suspend(host, PMSG_SUSPEND);
273 if (rc)
274 return rc;
275
276 if (pdata && pdata->suspend)
277 return pdata->suspend(dev);
278
279 if (!IS_ERR(hpriv->clk))
280 clk_disable_unprepare(hpriv->clk);
281
282 return 0;
283}
284
285static int ahci_resume(struct device *dev)
286{
287 struct ahci_platform_data *pdata = dev_get_platdata(dev);
288 struct ata_host *host = dev_get_drvdata(dev);
289 struct ahci_host_priv *hpriv = host->private_data;
290 int rc;
291
292 if (!IS_ERR(hpriv->clk)) {
293 rc = clk_prepare_enable(hpriv->clk);
294 if (rc) {
295 dev_err(dev, "clock prepare enable failed");
296 return rc;
297 }
298 }
299
300 if (pdata && pdata->resume) {
301 rc = pdata->resume(dev);
302 if (rc)
303 goto disable_unprepare_clk;
304 }
305
306 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
307 rc = ahci_reset_controller(host);
308 if (rc)
309 goto disable_unprepare_clk;
310
311 ahci_init_controller(host);
312 }
313
314 ata_host_resume(host);
315
316 return 0;
317
318disable_unprepare_clk:
319 if (!IS_ERR(hpriv->clk))
320 clk_disable_unprepare(hpriv->clk);
321
322 return rc;
323}
324#endif
325
326static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
327
328static const struct of_device_id ahci_of_match[] = {
329 { .compatible = "snps,spear-ahci", },
330 {},
331};
332MODULE_DEVICE_TABLE(of, ahci_of_match);
333
334static struct platform_driver ahci_driver = {
335 .probe = ahci_probe,
336 .remove = ata_platform_remove_one,
337 .driver = {
338 .name = "ahci",
339 .owner = THIS_MODULE,
340 .of_match_table = ahci_of_match,
341 .pm = &ahci_pm_ops,
342 },
343 .id_table = ahci_devtype,
344};
345module_platform_driver(ahci_driver);
346
347MODULE_DESCRIPTION("AHCI SATA platform driver");
348MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
349MODULE_LICENSE("GPL");
350MODULE_ALIAS("platform:ahci");
351
