1 /*
2 * AHCI SATA platform driver
3 *
4 * Copyright 2004-2005 Red Hat, Inc.
5 * Jeff Garzik <jgarzik@pobox.com>
6 * Copyright 2010 MontaVista Software, LLC.
7 * Anton Vorontsov <avorontsov@ru.mvista.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2, or (at your option)
12 * any later version.
13 */
14
15 #include <linux/kernel.h>
16 #include <linux/gfp.h>
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/interrupt.h>
20 #include <linux/device.h>
21 #include <linux/platform_device.h>
22 #include <linux/libata.h>
23 #include <linux/ahci_platform.h>
24 #include "ahci.h"
25
26 enum ahci_type {
27 AHCI, /* standard platform ahci */
28 IMX53_AHCI, /* ahci on i.mx53 */
29 };
30
31 static struct platform_device_id ahci_devtype[] = {
32 {
33 .name = "ahci",
34 .driver_data = AHCI,
35 }, {
36 .name = "imx53-ahci",
37 .driver_data = IMX53_AHCI,
38 }, {
39 /* sentinel */
40 }
41 };
42 MODULE_DEVICE_TABLE(platform, ahci_devtype);
43
44
45 static const struct ata_port_info ahci_port_info[] = {
46 /* by features */
47 [AHCI] = {
48 .flags = AHCI_FLAG_COMMON,
49 .pio_mask = ATA_PIO4,
50 .udma_mask = ATA_UDMA6,
51 .port_ops = &ahci_ops,
52 },
53 [IMX53_AHCI] = {
54 .flags = AHCI_FLAG_COMMON,
55 .pio_mask = ATA_PIO4,
56 .udma_mask = ATA_UDMA6,
57 .port_ops = &ahci_pmp_retry_srst_ops,
58 },
59 };
60
61 static struct scsi_host_template ahci_platform_sht = {
62 AHCI_SHT("ahci_platform"),
63 };
64
ahci_probe(struct platform_device * pdev)65 static int __init ahci_probe(struct platform_device *pdev)
66 {
67 struct device *dev = &pdev->dev;
68 struct ahci_platform_data *pdata = dev_get_platdata(dev);
69 const struct platform_device_id *id = platform_get_device_id(pdev);
70 struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
71 const struct ata_port_info *ppi[] = { &pi, NULL };
72 struct ahci_host_priv *hpriv;
73 struct ata_host *host;
74 struct resource *mem;
75 int irq;
76 int n_ports;
77 int i;
78 int rc;
79
80 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
81 if (!mem) {
82 dev_err(dev, "no mmio space\n");
83 return -EINVAL;
84 }
85
86 irq = platform_get_irq(pdev, 0);
87 if (irq <= 0) {
88 dev_err(dev, "no irq\n");
89 return -EINVAL;
90 }
91
92 if (pdata && pdata->ata_port_info)
93 pi = *pdata->ata_port_info;
94
95 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
96 if (!hpriv) {
97 dev_err(dev, "can't alloc ahci_host_priv\n");
98 return -ENOMEM;
99 }
100
101 hpriv->flags |= (unsigned long)pi.private_data;
102
103 hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
104 if (!hpriv->mmio) {
105 dev_err(dev, "can't map %pR\n", mem);
106 return -ENOMEM;
107 }
108
109 /*
110 * Some platforms might need to prepare for mmio region access,
111 * which could be done in the following init call. So, the mmio
112 * region shouldn't be accessed before init (if provided) has
113 * returned successfully.
114 */
115 if (pdata && pdata->init) {
116 rc = pdata->init(dev, hpriv->mmio);
117 if (rc)
118 return rc;
119 }
120
121 ahci_save_initial_config(dev, hpriv,
122 pdata ? pdata->force_port_map : 0,
123 pdata ? pdata->mask_port_map : 0);
124
125 /* prepare host */
126 if (hpriv->cap & HOST_CAP_NCQ)
127 pi.flags |= ATA_FLAG_NCQ;
128
129 if (hpriv->cap & HOST_CAP_PMP)
130 pi.flags |= ATA_FLAG_PMP;
131
132 ahci_set_em_messages(hpriv, &pi);
133
134 /* CAP.NP sometimes indicate the index of the last enabled
135 * port, at other times, that of the last possible port, so
136 * determining the maximum port number requires looking at
137 * both CAP.NP and port_map.
138 */
139 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
140
141 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
142 if (!host) {
143 rc = -ENOMEM;
144 goto err0;
145 }
146
147 host->private_data = hpriv;
148
149 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
150 host->flags |= ATA_HOST_PARALLEL_SCAN;
151 else
152 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
153
154 if (pi.flags & ATA_FLAG_EM)
155 ahci_reset_em(host);
156
157 for (i = 0; i < host->n_ports; i++) {
158 struct ata_port *ap = host->ports[i];
159
160 ata_port_desc(ap, "mmio %pR", mem);
161 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
162
163 /* set enclosure management message type */
164 if (ap->flags & ATA_FLAG_EM)
165 ap->em_message_type = hpriv->em_msg_type;
166
167 /* disabled/not-implemented port */
168 if (!(hpriv->port_map & (1 << i)))
169 ap->ops = &ata_dummy_port_ops;
170 }
171
172 rc = ahci_reset_controller(host);
173 if (rc)
174 goto err0;
175
176 ahci_init_controller(host);
177 ahci_print_info(host, "platform");
178
179 rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
180 &ahci_platform_sht);
181 if (rc)
182 goto err0;
183
184 return 0;
185 err0:
186 if (pdata && pdata->exit)
187 pdata->exit(dev);
188 return rc;
189 }
190
ahci_remove(struct platform_device * pdev)191 static int __devexit ahci_remove(struct platform_device *pdev)
192 {
193 struct device *dev = &pdev->dev;
194 struct ahci_platform_data *pdata = dev_get_platdata(dev);
195 struct ata_host *host = dev_get_drvdata(dev);
196
197 ata_host_detach(host);
198
199 if (pdata && pdata->exit)
200 pdata->exit(dev);
201
202 return 0;
203 }
204
205 #ifdef CONFIG_PM
ahci_suspend(struct device * dev)206 static int ahci_suspend(struct device *dev)
207 {
208 struct ahci_platform_data *pdata = dev_get_platdata(dev);
209 struct ata_host *host = dev_get_drvdata(dev);
210 struct ahci_host_priv *hpriv = host->private_data;
211 void __iomem *mmio = hpriv->mmio;
212 u32 ctl;
213 int rc;
214
215 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
216 dev_err(dev, "firmware update required for suspend/resume\n");
217 return -EIO;
218 }
219
220 /*
221 * AHCI spec rev1.1 section 8.3.3:
222 * Software must disable interrupts prior to requesting a
223 * transition of the HBA to D3 state.
224 */
225 ctl = readl(mmio + HOST_CTL);
226 ctl &= ~HOST_IRQ_EN;
227 writel(ctl, mmio + HOST_CTL);
228 readl(mmio + HOST_CTL); /* flush */
229
230 rc = ata_host_suspend(host, PMSG_SUSPEND);
231 if (rc)
232 return rc;
233
234 if (pdata && pdata->suspend)
235 return pdata->suspend(dev);
236 return 0;
237 }
238
ahci_resume(struct device * dev)239 static int ahci_resume(struct device *dev)
240 {
241 struct ahci_platform_data *pdata = dev_get_platdata(dev);
242 struct ata_host *host = dev_get_drvdata(dev);
243 int rc;
244
245 if (pdata && pdata->resume) {
246 rc = pdata->resume(dev);
247 if (rc)
248 return rc;
249 }
250
251 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
252 rc = ahci_reset_controller(host);
253 if (rc)
254 return rc;
255
256 ahci_init_controller(host);
257 }
258
259 ata_host_resume(host);
260
261 return 0;
262 }
263
264 static struct dev_pm_ops ahci_pm_ops = {
265 .suspend = &ahci_suspend,
266 .resume = &ahci_resume,
267 };
268 #endif
269
270 static const struct of_device_id ahci_of_match[] = {
271 { .compatible = "calxeda,hb-ahci", },
272 {},
273 };
274 MODULE_DEVICE_TABLE(of, ahci_of_match);
275
276 static struct platform_driver ahci_driver = {
277 .remove = __devexit_p(ahci_remove),
278 .driver = {
279 .name = "ahci",
280 .owner = THIS_MODULE,
281 .of_match_table = ahci_of_match,
282 #ifdef CONFIG_PM
283 .pm = &ahci_pm_ops,
284 #endif
285 },
286 .id_table = ahci_devtype,
287 };
288
ahci_init(void)289 static int __init ahci_init(void)
290 {
291 return platform_driver_probe(&ahci_driver, ahci_probe);
292 }
293 module_init(ahci_init);
294
ahci_exit(void)295 static void __exit ahci_exit(void)
296 {
297 platform_driver_unregister(&ahci_driver);
298 }
299 module_exit(ahci_exit);
300
301 MODULE_DESCRIPTION("AHCI SATA platform driver");
302 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
303 MODULE_LICENSE("GPL");
304 MODULE_ALIAS("platform:ahci");
305