blob: 7a8a2841fe64a93effec85f1ff5fc6dc4c610d06 [file] [log] [blame]
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +03001/*
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
Viresh Kumarf1e70c22012-08-27 10:37:19 +053015#include <linux/clk.h>
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +030016#include <linux/kernel.h>
Tejun Heofbaf6662010-03-30 02:52:43 +090017#include <linux/gfp.h>
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +030018#include <linux/module.h>
Shiraz Hashim18c25ff2012-03-16 15:49:55 +053019#include <linux/pm.h>
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +030020#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
Brian Norris1896b152012-11-02 00:46:17 -070028static void ahci_host_stop(struct ata_host *host);
29
Richard Zhu904c04f2011-09-28 15:41:54 +080030enum ahci_type {
31 AHCI, /* standard platform ahci */
32 IMX53_AHCI, /* ahci on i.mx53 */
Brian Norrisd408e2b2012-02-21 10:38:44 -080033 STRICT_AHCI, /* delayed DMA engine start */
Richard Zhu904c04f2011-09-28 15:41:54 +080034};
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 }, {
Brian Norrisd408e2b2012-02-21 10:38:44 -080044 .name = "strict-ahci",
45 .driver_data = STRICT_AHCI,
46 }, {
Richard Zhu904c04f2011-09-28 15:41:54 +080047 /* sentinel */
48 }
49};
50MODULE_DEVICE_TABLE(platform, ahci_devtype);
51
Brian Norris071d3ad2012-12-05 23:44:20 -080052static struct ata_port_operations ahci_platform_ops = {
Brian Norris1896b152012-11-02 00:46:17 -070053 .inherits = &ahci_ops,
54 .host_stop = ahci_host_stop,
55};
56
Brian Norris071d3ad2012-12-05 23:44:20 -080057static struct ata_port_operations ahci_platform_retry_srst_ops = {
Brian Norris1896b152012-11-02 00:46:17 -070058 .inherits = &ahci_pmp_retry_srst_ops,
59 .host_stop = ahci_host_stop,
60};
Richard Zhu904c04f2011-09-28 15:41:54 +080061
62static const struct ata_port_info ahci_port_info[] = {
63 /* by features */
64 [AHCI] = {
65 .flags = AHCI_FLAG_COMMON,
66 .pio_mask = ATA_PIO4,
67 .udma_mask = ATA_UDMA6,
Brian Norris1896b152012-11-02 00:46:17 -070068 .port_ops = &ahci_platform_ops,
Richard Zhu904c04f2011-09-28 15:41:54 +080069 },
70 [IMX53_AHCI] = {
71 .flags = AHCI_FLAG_COMMON,
72 .pio_mask = ATA_PIO4,
73 .udma_mask = ATA_UDMA6,
Brian Norris1896b152012-11-02 00:46:17 -070074 .port_ops = &ahci_platform_retry_srst_ops,
Richard Zhu904c04f2011-09-28 15:41:54 +080075 },
Brian Norrisd408e2b2012-02-21 10:38:44 -080076 [STRICT_AHCI] = {
77 AHCI_HFLAGS (AHCI_HFLAG_DELAY_ENGINE),
78 .flags = AHCI_FLAG_COMMON,
79 .pio_mask = ATA_PIO4,
80 .udma_mask = ATA_UDMA6,
Brian Norris1896b152012-11-02 00:46:17 -070081 .port_ops = &ahci_platform_ops,
Brian Norrisd408e2b2012-02-21 10:38:44 -080082 },
Richard Zhu904c04f2011-09-28 15:41:54 +080083};
84
Tejun Heofad16e72010-09-21 09:25:48 +020085static struct scsi_host_template ahci_platform_sht = {
86 AHCI_SHT("ahci_platform"),
87};
88
Greg Kroah-Hartman0ec24912012-12-21 13:19:58 -080089static int ahci_probe(struct platform_device *pdev)
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +030090{
91 struct device *dev = &pdev->dev;
JiSheng Zhang00345612011-10-31 21:20:10 +080092 struct ahci_platform_data *pdata = dev_get_platdata(dev);
Richard Zhu904c04f2011-09-28 15:41:54 +080093 const struct platform_device_id *id = platform_get_device_id(pdev);
Rob Herringff956132011-11-15 21:00:56 -060094 struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +030095 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
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300116 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) {
Jassi Brar08354802010-06-25 18:21:19 +0900121 dev_err(dev, "can't alloc ahci_host_priv\n");
122 return -ENOMEM;
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300123 }
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);
Jassi Brar08354802010-06-25 18:21:19 +0900130 return -ENOMEM;
131 }
132
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530133 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
Jassi Brar08354802010-06-25 18:21:19 +0900144 /*
145 * Some platforms might need to prepare for mmio region access,
146 * which could be done in the following init call. So, the mmio
147 * region shouldn't be accessed before init (if provided) has
148 * returned successfully.
149 */
150 if (pdata && pdata->init) {
151 rc = pdata->init(dev, hpriv->mmio);
152 if (rc)
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530153 goto disable_unprepare_clk;
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300154 }
155
156 ahci_save_initial_config(dev, hpriv,
157 pdata ? pdata->force_port_map : 0,
158 pdata ? pdata->mask_port_map : 0);
159
160 /* prepare host */
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 /* CAP.NP sometimes indicate the index of the last enabled
170 * port, at other times, that of the last possible port, so
171 * determining the maximum port number requires looking at
172 * both CAP.NP and port_map.
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;
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530179 goto pdata_exit;
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300180 }
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
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300198 /* set enclosure management message type */
199 if (ap->flags & ATA_FLAG_EM)
Jeff Garzik55787182010-05-14 17:23:37 -0400200 ap->em_message_type = hpriv->em_msg_type;
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300201
202 /* disabled/not-implemented port */
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)
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530209 goto pdata_exit;
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300210
211 ahci_init_controller(host);
212 ahci_print_info(host, "platform");
213
214 rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
Tejun Heofad16e72010-09-21 09:25:48 +0200215 &ahci_platform_sht);
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300216 if (rc)
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530217 goto pdata_exit;
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300218
219 return 0;
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530220pdata_exit:
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300221 if (pdata && pdata->exit)
222 pdata->exit(dev);
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530223disable_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);
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300229 return rc;
230}
231
Brian Norris1896b152012-11-02 00:46:17 -0700232static 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
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300238 if (pdata && pdata->exit)
239 pdata->exit(dev);
240
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530241 if (!IS_ERR(hpriv->clk)) {
242 clk_disable_unprepare(hpriv->clk);
243 clk_put(hpriv->clk);
244 }
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300245}
246
Yuanhan Liu29448ec2012-10-16 22:59:01 +0800247#ifdef CONFIG_PM_SLEEP
Brian Norris17ab5942011-11-18 11:10:10 -0800248static 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 * AHCI spec rev1.1 section 8.3.3:
264 * Software must disable interrupts prior to requesting a
265 * transition of the HBA to D3 state.
266 */
267 ctl = readl(mmio + HOST_CTL);
268 ctl &= ~HOST_IRQ_EN;
269 writel(ctl, mmio + HOST_CTL);
270 readl(mmio + HOST_CTL); /* flush */
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);
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530278
279 if (!IS_ERR(hpriv->clk))
280 clk_disable_unprepare(hpriv->clk);
281
Brian Norris17ab5942011-11-18 11:10:10 -0800282 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);
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530289 struct ahci_host_priv *hpriv = host->private_data;
Brian Norris17ab5942011-11-18 11:10:10 -0800290 int rc;
291
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530292 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
Brian Norris17ab5942011-11-18 11:10:10 -0800300 if (pdata && pdata->resume) {
301 rc = pdata->resume(dev);
302 if (rc)
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530303 goto disable_unprepare_clk;
Brian Norris17ab5942011-11-18 11:10:10 -0800304 }
305
306 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
307 rc = ahci_reset_controller(host);
308 if (rc)
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530309 goto disable_unprepare_clk;
Brian Norris17ab5942011-11-18 11:10:10 -0800310
311 ahci_init_controller(host);
312 }
313
314 ata_host_resume(host);
315
316 return 0;
Viresh Kumarf1e70c22012-08-27 10:37:19 +0530317
318disable_unprepare_clk:
319 if (!IS_ERR(hpriv->clk))
320 clk_disable_unprepare(hpriv->clk);
321
322 return rc;
Brian Norris17ab5942011-11-18 11:10:10 -0800323}
Brian Norris17ab5942011-11-18 11:10:10 -0800324#endif
325
Brian Norris071d3ad2012-12-05 23:44:20 -0800326static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
Shiraz Hashim18c25ff2012-03-16 15:49:55 +0530327
Rob Herring02aac312010-11-03 21:04:59 -0500328static const struct of_device_id ahci_of_match[] = {
Viresh Kumar5f098a32012-04-21 17:40:12 +0530329 { .compatible = "snps,spear-ahci", },
Rob Herring02aac312010-11-03 21:04:59 -0500330 {},
331};
332MODULE_DEVICE_TABLE(of, ahci_of_match);
333
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300334static struct platform_driver ahci_driver = {
Brian Norris941c77f2012-11-02 00:46:15 -0700335 .probe = ahci_probe,
Brian Norris83291d62012-11-02 00:46:19 -0700336 .remove = ata_platform_remove_one,
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300337 .driver = {
338 .name = "ahci",
339 .owner = THIS_MODULE,
Rob Herring02aac312010-11-03 21:04:59 -0500340 .of_match_table = ahci_of_match,
Brian Norris17ab5942011-11-18 11:10:10 -0800341 .pm = &ahci_pm_ops,
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300342 },
Richard Zhu904c04f2011-09-28 15:41:54 +0800343 .id_table = ahci_devtype,
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300344};
Brian Norris9a99e472012-11-02 00:46:16 -0700345module_platform_driver(ahci_driver);
Anton Vorontsov1c2a49f2010-03-04 20:06:06 +0300346
347MODULE_DESCRIPTION("AHCI SATA platform driver");
348MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
349MODULE_LICENSE("GPL");
350MODULE_ALIAS("platform:ahci");