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 struct scsi_host_template ahci_platform_sht = {
  27         AHCI_SHT("ahci_platform"),
  28 };
  29
  30 static int __init ahci_probe(struct platform_device *pdev)
  31 {
  32         struct device *dev = &pdev->dev;
  33         struct ahci_platform_data *pdata = dev->platform_data;
  34         struct ata_port_info pi = {
  35                 .flags          = AHCI_FLAG_COMMON,
  36                 .pio_mask       = ATA_PIO4,
  37                 .udma_mask      = ATA_UDMA6,
  38                 .port_ops       = &ahci_ops,
  39         };
  40         const struct ata_port_info *ppi[] = { &pi, NULL };
  41         struct ahci_host_priv *hpriv;
  42         struct ata_host *host;
  43         struct resource *mem;
  44         int irq;
  45         int n_ports;
  46         int i;
  47         int rc;
  48
  49         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  50         if (!mem) {
  51                 dev_err(dev, "no mmio space\n");
  52                 return -EINVAL;
  53         }
  54
  55         irq = platform_get_irq(pdev, 0);
  56         if (irq <= 0) {
  57                 dev_err(dev, "no irq\n");
  58                 return -EINVAL;
  59         }
  60
  61         if (pdata && pdata->ata_port_info)
  62                 pi = *pdata->ata_port_info;
  63
  64         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
  65         if (!hpriv) {
  66                 dev_err(dev, "can't alloc ahci_host_priv\n");
  67                 return -ENOMEM;
  68         }
  69
  70         hpriv->flags |= (unsigned long)pi.private_data;
  71
  72         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
  73         if (!hpriv->mmio) {
  74                 dev_err(dev, "can't map %pR\n", mem);
  75                 return -ENOMEM;
  76         }
  77
  78         /*
  79          * Some platforms might need to prepare for mmio region access,
  80          * which could be done in the following init call. So, the mmio
  81          * region shouldn't be accessed before init (if provided) has
  82          * returned successfully.
  83          */
  84         if (pdata && pdata->init) {
  85                 rc = pdata->init(dev, hpriv->mmio);
  86                 if (rc)
  87                         return rc;
  88         }
  89
  90         ahci_save_initial_config(dev, hpriv,
  91                 pdata ? pdata->force_port_map : 0,
  92                 pdata ? pdata->mask_port_map  : 0);
  93
  94         /* prepare host */
  95         if (hpriv->cap & HOST_CAP_NCQ)
  96                 pi.flags |= ATA_FLAG_NCQ;
  97
  98         if (hpriv->cap & HOST_CAP_PMP)
  99                 pi.flags |= ATA_FLAG_PMP;
 100
 101         ahci_set_em_messages(hpriv, &pi);
 102
 103         /* CAP.NP sometimes indicate the index of the last enabled
 104          * port, at other times, that of the last possible port, so
 105          * determining the maximum port number requires looking at
 106          * both CAP.NP and port_map.
 107          */
 108         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 109
 110         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 111         if (!host) {
 112                 rc = -ENOMEM;
 113                 goto err0;
 114         }
 115
 116         host->private_data = hpriv;
 117
 118         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 119                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 120         else
 121                 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
 122
 123         if (pi.flags & ATA_FLAG_EM)
 124                 ahci_reset_em(host);
 125
 126         for (i = 0; i < host->n_ports; i++) {
 127                 struct ata_port *ap = host->ports[i];
 128
 129                 ata_port_desc(ap, "mmio %pR", mem);
 130                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 131
 132                 /* set enclosure management message type */
 133                 if (ap->flags & ATA_FLAG_EM)
 134                         ap->em_message_type = hpriv->em_msg_type;
 135
 136                 /* disabled/not-implemented port */
 137                 if (!(hpriv->port_map & (1 << i)))
 138                         ap->ops = &ata_dummy_port_ops;
 139         }
 140
 141         rc = ahci_reset_controller(host);
 142         if (rc)
 143                 goto err0;
 144
 145         ahci_init_controller(host);
 146         ahci_print_info(host, "platform");
 147
 148         rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 149                                &ahci_platform_sht);
 150         if (rc)
 151                 goto err0;
 152
 153         return 0;
 154 err0:
 155         if (pdata && pdata->exit)
 156                 pdata->exit(dev);
 157         return rc;
 158 }
 159
 160 static int __devexit ahci_remove(struct platform_device *pdev)
 161 {
 162         struct device *dev = &pdev->dev;
 163         struct ahci_platform_data *pdata = dev->platform_data;
 164         struct ata_host *host = dev_get_drvdata(dev);
 165
 166         ata_host_detach(host);
 167
 168         if (pdata && pdata->exit)
 169                 pdata->exit(dev);
 170
 171         return 0;
 172 }
 173
 174 static struct platform_driver ahci_driver = {
 175         .remove = __devexit_p(ahci_remove),
 176         .driver = {
 177                 .name = "ahci",
 178                 .owner = THIS_MODULE,
 179         },
 180 };
 181
 182 static int __init ahci_init(void)
 183 {
 184         return platform_driver_probe(&ahci_driver, ahci_probe);
 185 }
 186 module_init(ahci_init);
 187
 188 static void __exit ahci_exit(void)
 189 {
 190         platform_driver_unregister(&ahci_driver);
 191 }
 192 module_exit(ahci_exit);
 193
 194 MODULE_DESCRIPTION("AHCI SATA platform driver");
 195 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 196 MODULE_LICENSE("GPL");
 197 MODULE_ALIAS("platform:ahci");