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->ata_port_info)
  58                 pi = *pdata->ata_port_info;
  59
  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;
  64         }
  65
  66         hpriv->flags |= (unsigned long)pi.private_data;
  67
  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;
  72         }
  73
  74         /*
  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.
  79          */
  80         if (pdata && pdata->init) {
  81                 rc = pdata->init(dev, hpriv->mmio);
  82                 if (rc)
  83                         return rc;
  84         }
  85
  86         ahci_save_initial_config(dev, hpriv,
  87                 pdata ? pdata->force_port_map : 0,
  88                 pdata ? pdata->mask_port_map  : 0);
  89
  90         /* prepare host */
  91         if (hpriv->cap & HOST_CAP_NCQ)
  92                 pi.flags |= ATA_FLAG_NCQ;
  93
  94         if (hpriv->cap & HOST_CAP_PMP)
  95                 pi.flags |= ATA_FLAG_PMP;
  96
  97         ahci_set_em_messages(hpriv, &pi);
  98
  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.
 103          */
 104         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 105
 106         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 107         if (!host) {
 108                 rc = -ENOMEM;
 109                 goto err0;
 110         }
 111
 112         host->private_data = hpriv;
 113
 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");
 118
 119         if (pi.flags & ATA_FLAG_EM)
 120                 ahci_reset_em(host);
 121
 122         for (i = 0; i < host->n_ports; i++) {
 123                 struct ata_port *ap = host->ports[i];
 124
 125                 ata_port_desc(ap, "mmio %pR", mem);
 126                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 127
 128                 /* set initial link pm policy */
 129                 ap->pm_policy = NOT_AVAILABLE;
 130
 131                 /* set enclosure management message type */
 132                 if (ap->flags & ATA_FLAG_EM)
 133                         ap->em_message_type = hpriv->em_msg_type;
 134
 135                 /* disabled/not-implemented port */
 136                 if (!(hpriv->port_map & (1 << i)))
 137                         ap->ops = &ata_dummy_port_ops;
 138         }
 139
 140         rc = ahci_reset_controller(host);
 141         if (rc)
 142                 goto err0;
 143
 144         ahci_init_controller(host);
 145         ahci_print_info(host, "platform");
 146
 147         rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 148                                &ahci_sht);
 149         if (rc)
 150                 goto err0;
 151
 152         return 0;
 153 err0:
 154         if (pdata && pdata->exit)
 155                 pdata->exit(dev);
 156         return rc;
 157 }
 158
 159 static int __devexit ahci_remove(struct platform_device *pdev)
 160 {
 161         struct device *dev = &pdev->dev;
 162         struct ahci_platform_data *pdata = dev->platform_data;
 163         struct ata_host *host = dev_get_drvdata(dev);
 164
 165         ata_host_detach(host);
 166
 167         if (pdata && pdata->exit)
 168                 pdata->exit(dev);
 169
 170         return 0;
 171 }
 172
 173 static struct platform_driver ahci_driver = {
 174         .remove = __devexit_p(ahci_remove),
 175         .driver = {
 176                 .name = "ahci",
 177                 .owner = THIS_MODULE,
 178         },
 179 };
 180
 181 static int __init ahci_init(void)
 182 {
 183         return platform_driver_probe(&ahci_driver, ahci_probe);
 184 }
 185 module_init(ahci_init);
 186
 187 static void __exit ahci_exit(void)
 188 {
 189         platform_driver_unregister(&ahci_driver);
 190 }
 191 module_exit(ahci_exit);
 192
 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");