2 * AHCI SATA platform driver
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>
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)
15 #include <linux/kernel.h>
16 #include <linux/gfp.h>
17 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <linux/device.h>
22 #include <linux/platform_device.h>
23 #include <linux/libata.h>
24 #include <linux/ahci_platform.h>
28 AHCI, /* standard platform ahci */
29 IMX53_AHCI, /* ahci on i.mx53 */
30 STRICT_AHCI, /* delayed DMA engine start */
33 static struct platform_device_id ahci_devtype[] = {
39 .driver_data = IMX53_AHCI,
41 .name = "strict-ahci",
42 .driver_data = STRICT_AHCI,
47 MODULE_DEVICE_TABLE(platform, ahci_devtype);
50 static const struct ata_port_info ahci_port_info[] = {
53 .flags = AHCI_FLAG_COMMON,
55 .udma_mask = ATA_UDMA6,
56 .port_ops = &ahci_ops,
59 .flags = AHCI_FLAG_COMMON,
61 .udma_mask = ATA_UDMA6,
62 .port_ops = &ahci_pmp_retry_srst_ops,
65 AHCI_HFLAGS (AHCI_HFLAG_DELAY_ENGINE),
66 .flags = AHCI_FLAG_COMMON,
68 .udma_mask = ATA_UDMA6,
69 .port_ops = &ahci_ops,
73 static struct scsi_host_template ahci_platform_sht = {
74 AHCI_SHT("ahci_platform"),
77 static int __init ahci_probe(struct platform_device *pdev)
79 struct device *dev = &pdev->dev;
80 struct ahci_platform_data *pdata = dev_get_platdata(dev);
81 const struct platform_device_id *id = platform_get_device_id(pdev);
82 struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
83 const struct ata_port_info *ppi[] = { &pi, NULL };
84 struct ahci_host_priv *hpriv;
85 struct ata_host *host;
92 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
94 dev_err(dev, "no mmio space\n");
98 irq = platform_get_irq(pdev, 0);
100 dev_err(dev, "no irq\n");
104 if (pdata && pdata->ata_port_info)
105 pi = *pdata->ata_port_info;
107 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
109 dev_err(dev, "can't alloc ahci_host_priv\n");
113 hpriv->flags |= (unsigned long)pi.private_data;
115 hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
117 dev_err(dev, "can't map %pR\n", mem);
122 * Some platforms might need to prepare for mmio region access,
123 * which could be done in the following init call. So, the mmio
124 * region shouldn't be accessed before init (if provided) has
125 * returned successfully.
127 if (pdata && pdata->init) {
128 rc = pdata->init(dev, hpriv->mmio);
133 ahci_save_initial_config(dev, hpriv,
134 pdata ? pdata->force_port_map : 0,
135 pdata ? pdata->mask_port_map : 0);
138 if (hpriv->cap & HOST_CAP_NCQ)
139 pi.flags |= ATA_FLAG_NCQ;
141 if (hpriv->cap & HOST_CAP_PMP)
142 pi.flags |= ATA_FLAG_PMP;
144 ahci_set_em_messages(hpriv, &pi);
146 /* CAP.NP sometimes indicate the index of the last enabled
147 * port, at other times, that of the last possible port, so
148 * determining the maximum port number requires looking at
149 * both CAP.NP and port_map.
151 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
153 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
159 host->private_data = hpriv;
161 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
162 host->flags |= ATA_HOST_PARALLEL_SCAN;
164 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
166 if (pi.flags & ATA_FLAG_EM)
169 for (i = 0; i < host->n_ports; i++) {
170 struct ata_port *ap = host->ports[i];
172 ata_port_desc(ap, "mmio %pR", mem);
173 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
175 /* set enclosure management message type */
176 if (ap->flags & ATA_FLAG_EM)
177 ap->em_message_type = hpriv->em_msg_type;
179 /* disabled/not-implemented port */
180 if (!(hpriv->port_map & (1 << i)))
181 ap->ops = &ata_dummy_port_ops;
184 rc = ahci_reset_controller(host);
188 ahci_init_controller(host);
189 ahci_print_info(host, "platform");
191 rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
198 if (pdata && pdata->exit)
203 static int __devexit ahci_remove(struct platform_device *pdev)
205 struct device *dev = &pdev->dev;
206 struct ahci_platform_data *pdata = dev_get_platdata(dev);
207 struct ata_host *host = dev_get_drvdata(dev);
209 ata_host_detach(host);
211 if (pdata && pdata->exit)
218 static int ahci_suspend(struct device *dev)
220 struct ahci_platform_data *pdata = dev_get_platdata(dev);
221 struct ata_host *host = dev_get_drvdata(dev);
222 struct ahci_host_priv *hpriv = host->private_data;
223 void __iomem *mmio = hpriv->mmio;
227 if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
228 dev_err(dev, "firmware update required for suspend/resume\n");
233 * AHCI spec rev1.1 section 8.3.3:
234 * Software must disable interrupts prior to requesting a
235 * transition of the HBA to D3 state.
237 ctl = readl(mmio + HOST_CTL);
239 writel(ctl, mmio + HOST_CTL);
240 readl(mmio + HOST_CTL); /* flush */
242 rc = ata_host_suspend(host, PMSG_SUSPEND);
246 if (pdata && pdata->suspend)
247 return pdata->suspend(dev);
251 static int ahci_resume(struct device *dev)
253 struct ahci_platform_data *pdata = dev_get_platdata(dev);
254 struct ata_host *host = dev_get_drvdata(dev);
257 if (pdata && pdata->resume) {
258 rc = pdata->resume(dev);
263 if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
264 rc = ahci_reset_controller(host);
268 ahci_init_controller(host);
271 ata_host_resume(host);
277 SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
279 static const struct of_device_id ahci_of_match[] = {
280 { .compatible = "calxeda,hb-ahci", },
281 { .compatible = "snps,spear-ahci", },
284 MODULE_DEVICE_TABLE(of, ahci_of_match);
286 static struct platform_driver ahci_driver = {
287 .remove = __devexit_p(ahci_remove),
290 .owner = THIS_MODULE,
291 .of_match_table = ahci_of_match,
294 .id_table = ahci_devtype,
297 static int __init ahci_init(void)
299 return platform_driver_probe(&ahci_driver, ahci_probe);
301 module_init(ahci_init);
303 static void __exit ahci_exit(void)
305 platform_driver_unregister(&ahci_driver);
307 module_exit(ahci_exit);
309 MODULE_DESCRIPTION("AHCI SATA platform driver");
310 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
311 MODULE_LICENSE("GPL");
312 MODULE_ALIAS("platform:ahci");