drivers/ata/ahci_platform.c

   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 static int __init ahci_probe(struct platform_device *pdev)
  27 {
  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,
  35         };
  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;
  44
  45         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  46         if (!mem) {
  47                 dev_err(dev, "no mmio space\n");
  48                 return -EINVAL;
  49         }
  50
  51         irq = platform_get_irq(pdev, 0);
  52         if (irq <= 0) {
  53                 dev_err(dev, "no irq\n");
  54                 return -EINVAL;
  55         }
  56
  57         if (pdata && pdata->init) {
  58                 rc = pdata->init(dev);
  59                 if (rc)
  60                         return rc;
  61         }
  62
  63         if (pdata && pdata->ata_port_info)
  64                 pi = *pdata->ata_port_info;
  65
  66         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
  67         if (!hpriv) {
  68                 rc = -ENOMEM;
  69                 goto err0;
  70         }
  71
  72         hpriv->flags |= (unsigned long)pi.private_data;
  73
  74         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
  75         if (!hpriv->mmio) {
  76                 dev_err(dev, "can't map %pR\n", mem);
  77                 rc = -ENOMEM;
  78                 goto err0;
  79         }
  80
  81         ahci_save_initial_config(dev, hpriv,
  82                 pdata ? pdata->force_port_map : 0,
  83                 pdata ? pdata->mask_port_map  : 0);
  84
  85         /* prepare host */
  86         if (hpriv->cap & HOST_CAP_NCQ)
  87                 pi.flags |= ATA_FLAG_NCQ;
  88
  89         if (hpriv->cap & HOST_CAP_PMP)
  90                 pi.flags |= ATA_FLAG_PMP;
  91
  92         ahci_set_em_messages(hpriv, &pi);
  93
  94         /* CAP.NP sometimes indicate the index of the last enabled
  95          * port, at other times, that of the last possible port, so
  96          * determining the maximum port number requires looking at
  97          * both CAP.NP and port_map.
  98          */
  99         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 100
 101         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 102         if (!host) {
 103                 rc = -ENOMEM;
 104                 goto err0;
 105         }
 106
 107         host->private_data = hpriv;
 108
 109         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 110                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 111         else
 112                 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
 113
 114         if (pi.flags & ATA_FLAG_EM)
 115                 ahci_reset_em(host);
 116
 117         for (i = 0; i < host->n_ports; i++) {
 118                 struct ata_port *ap = host->ports[i];
 119
 120                 ata_port_desc(ap, "mmio %pR", mem);
 121                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 122
 123                 /* set initial link pm policy */
 124                 ap->pm_policy = NOT_AVAILABLE;
 125
 126                 /* set enclosure management message type */
 127                 if (ap->flags & ATA_FLAG_EM)
 128                         ap->em_message_type = hpriv->em_msg_type;
 129
 130                 /* disabled/not-implemented port */
 131                 if (!(hpriv->port_map & (1 << i)))
 132                         ap->ops = &ata_dummy_port_ops;
 133         }
 134
 135         rc = ahci_reset_controller(host);
 136         if (rc)
 137                 goto err0;
 138
 139         ahci_init_controller(host);
 140         ahci_print_info(host, "platform");
 141
 142         rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 143                                &ahci_sht);
 144         if (rc)
 145                 goto err0;
 146
 147         return 0;
 148 err0:
 149         if (pdata && pdata->exit)
 150                 pdata->exit(dev);
 151         return rc;
 152 }
 153
 154 static int __devexit ahci_remove(struct platform_device *pdev)
 155 {
 156         struct device *dev = &pdev->dev;
 157         struct ahci_platform_data *pdata = dev->platform_data;
 158         struct ata_host *host = dev_get_drvdata(dev);
 159
 160         ata_host_detach(host);
 161
 162         if (pdata && pdata->exit)
 163                 pdata->exit(dev);
 164
 165         return 0;
 166 }
 167
 168 static struct platform_driver ahci_driver = {
 169         .probe = ahci_probe,
 170         .remove = __devexit_p(ahci_remove),
 171         .driver = {
 172                 .name = "ahci",
 173                 .owner = THIS_MODULE,
 174         },
 175 };
 176
 177 static int __init ahci_init(void)
 178 {
 179         return platform_driver_probe(&ahci_driver, ahci_probe);
 180 }
 181 module_init(ahci_init);
 182
 183 static void __exit ahci_exit(void)
 184 {
 185         platform_driver_unregister(&ahci_driver);
 186 }
 187 module_exit(ahci_exit);
 188
 189 MODULE_DESCRIPTION("AHCI SATA platform driver");
 190 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 191 MODULE_LICENSE("GPL");
 192 MODULE_ALIAS("platform:ahci");