drm/i915/sdvo: Preserve pixel-multiplier
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / ata / ahci_platform.c
blob4e97f33cca4406212b9769c6c13fc11afc02bc4a
1 /*
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)
12 * any later version.
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"
26 static int __init ahci_probe(struct platform_device *pdev)
28 struct device *dev = &pdev->dev;
29 struct ahci_platform_data *pdata = dev->platform_data;
30 struct ata_port_info pi = {
31 .flags = AHCI_FLAG_COMMON,
32 .pio_mask = ATA_PIO4,
33 .udma_mask = ATA_UDMA6,
34 .port_ops = &ahci_ops,
36 const struct ata_port_info *ppi[] = { &pi, NULL };
37 struct ahci_host_priv *hpriv;
38 struct ata_host *host;
39 struct resource *mem;
40 int irq;
41 int n_ports;
42 int i;
43 int rc;
45 mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
46 if (!mem) {
47 dev_err(dev, "no mmio space\n");
48 return -EINVAL;
51 irq = platform_get_irq(pdev, 0);
52 if (irq <= 0) {
53 dev_err(dev, "no irq\n");
54 return -EINVAL;
57 if (pdata && pdata->ata_port_info)
58 pi = *pdata->ata_port_info;
60 hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
61 if (!hpriv) {
62 dev_err(dev, "can't alloc ahci_host_priv\n");
63 return -ENOMEM;
66 hpriv->flags |= (unsigned long)pi.private_data;
68 hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
69 if (!hpriv->mmio) {
70 dev_err(dev, "can't map %pR\n", mem);
71 return -ENOMEM;
75 * Some platforms might need to prepare for mmio region access,
76 * which could be done in the following init call. So, the mmio
77 * region shouldn't be accessed before init (if provided) has
78 * returned successfully.
80 if (pdata && pdata->init) {
81 rc = pdata->init(dev, hpriv->mmio);
82 if (rc)
83 return rc;
86 ahci_save_initial_config(dev, hpriv,
87 pdata ? pdata->force_port_map : 0,
88 pdata ? pdata->mask_port_map : 0);
90 /* prepare host */
91 if (hpriv->cap & HOST_CAP_NCQ)
92 pi.flags |= ATA_FLAG_NCQ;
94 if (hpriv->cap & HOST_CAP_PMP)
95 pi.flags |= ATA_FLAG_PMP;
97 ahci_set_em_messages(hpriv, &pi);
99 /* CAP.NP sometimes indicate the index of the last enabled
100 * port, at other times, that of the last possible port, so
101 * determining the maximum port number requires looking at
102 * both CAP.NP and port_map.
104 n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
106 host = ata_host_alloc_pinfo(dev, ppi, n_ports);
107 if (!host) {
108 rc = -ENOMEM;
109 goto err0;
112 host->private_data = hpriv;
114 if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
115 host->flags |= ATA_HOST_PARALLEL_SCAN;
116 else
117 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
119 if (pi.flags & ATA_FLAG_EM)
120 ahci_reset_em(host);
122 for (i = 0; i < host->n_ports; i++) {
123 struct ata_port *ap = host->ports[i];
125 ata_port_desc(ap, "mmio %pR", mem);
126 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
128 /* set initial link pm policy */
129 ap->pm_policy = NOT_AVAILABLE;
131 /* set enclosure management message type */
132 if (ap->flags & ATA_FLAG_EM)
133 ap->em_message_type = hpriv->em_msg_type;
135 /* disabled/not-implemented port */
136 if (!(hpriv->port_map & (1 << i)))
137 ap->ops = &ata_dummy_port_ops;
140 rc = ahci_reset_controller(host);
141 if (rc)
142 goto err0;
144 ahci_init_controller(host);
145 ahci_print_info(host, "platform");
147 rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
148 &ahci_sht);
149 if (rc)
150 goto err0;
152 return 0;
153 err0:
154 if (pdata && pdata->exit)
155 pdata->exit(dev);
156 return rc;
159 static int __devexit ahci_remove(struct platform_device *pdev)
161 struct device *dev = &pdev->dev;
162 struct ahci_platform_data *pdata = dev->platform_data;
163 struct ata_host *host = dev_get_drvdata(dev);
165 ata_host_detach(host);
167 if (pdata && pdata->exit)
168 pdata->exit(dev);
170 return 0;
173 static struct platform_driver ahci_driver = {
174 .remove = __devexit_p(ahci_remove),
175 .driver = {
176 .name = "ahci",
177 .owner = THIS_MODULE,
181 static int __init ahci_init(void)
183 return platform_driver_probe(&ahci_driver, ahci_probe);
185 module_init(ahci_init);
187 static void __exit ahci_exit(void)
189 platform_driver_unregister(&ahci_driver);
191 module_exit(ahci_exit);
193 MODULE_DESCRIPTION("AHCI SATA platform driver");
194 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
195 MODULE_LICENSE("GPL");
196 MODULE_ALIAS("platform:ahci");