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 enum ahci_type {
  27         AHCI,           /* standard platform ahci */
  28         IMX53_AHCI,     /* ahci on i.mx53 */
  29 };
  30
  31 static struct platform_device_id ahci_devtype[] = {
  32         {
  33                 .name = "ahci",
  34                 .driver_data = AHCI,
  35         }, {
  36                 .name = "imx53-ahci",
  37                 .driver_data = IMX53_AHCI,
  38         }, {
  39                 /* sentinel */
  40         }
  41 };
  42 MODULE_DEVICE_TABLE(platform, ahci_devtype);
  43
  44
  45 static const struct ata_port_info ahci_port_info[] = {
  46         /* by features */
  47         [AHCI] = {
  48                 .flags          = AHCI_FLAG_COMMON,
  49                 .pio_mask       = ATA_PIO4,
  50                 .udma_mask      = ATA_UDMA6,
  51                 .port_ops       = &ahci_ops,
  52         },
  53         [IMX53_AHCI] = {
  54                 .flags          = AHCI_FLAG_COMMON,
  55                 .pio_mask       = ATA_PIO4,
  56                 .udma_mask      = ATA_UDMA6,
  57                 .port_ops       = &ahci_pmp_retry_srst_ops,
  58         },
  59 };
  60
  61 static struct scsi_host_template ahci_platform_sht = {
  62         AHCI_SHT("ahci_platform"),
  63 };
  64
  65 static int __init ahci_probe(struct platform_device *pdev)
  66 {
  67         struct device *dev = &pdev->dev;
  68         struct ahci_platform_data *pdata = dev_get_platdata(dev);
  69         const struct platform_device_id *id = platform_get_device_id(pdev);
  70         struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
  71         const struct ata_port_info *ppi[] = { &pi, NULL };
  72         struct ahci_host_priv *hpriv;
  73         struct ata_host *host;
  74         struct resource *mem;
  75         int irq;
  76         int n_ports;
  77         int i;
  78         int rc;
  79
  80         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  81         if (!mem) {
  82                 dev_err(dev, "no mmio space\n");
  83                 return -EINVAL;
  84         }
  85
  86         irq = platform_get_irq(pdev, 0);
  87         if (irq <= 0) {
  88                 dev_err(dev, "no irq\n");
  89                 return -EINVAL;
  90         }
  91
  92         if (pdata && pdata->ata_port_info)
  93                 pi = *pdata->ata_port_info;
  94
  95         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
  96         if (!hpriv) {
  97                 dev_err(dev, "can't alloc ahci_host_priv\n");
  98                 return -ENOMEM;
  99         }
 100
 101         hpriv->flags |= (unsigned long)pi.private_data;
 102
 103         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
 104         if (!hpriv->mmio) {
 105                 dev_err(dev, "can't map %pR\n", mem);
 106                 return -ENOMEM;
 107         }
 108
 109         /*
 110          * Some platforms might need to prepare for mmio region access,
 111          * which could be done in the following init call. So, the mmio
 112          * region shouldn't be accessed before init (if provided) has
 113          * returned successfully.
 114          */
 115         if (pdata && pdata->init) {
 116                 rc = pdata->init(dev, hpriv->mmio);
 117                 if (rc)
 118                         return rc;
 119         }
 120
 121         ahci_save_initial_config(dev, hpriv,
 122                 pdata ? pdata->force_port_map : 0,
 123                 pdata ? pdata->mask_port_map  : 0);
 124
 125         /* prepare host */
 126         if (hpriv->cap & HOST_CAP_NCQ)
 127                 pi.flags |= ATA_FLAG_NCQ;
 128
 129         if (hpriv->cap & HOST_CAP_PMP)
 130                 pi.flags |= ATA_FLAG_PMP;
 131
 132         ahci_set_em_messages(hpriv, &pi);
 133
 134         /* CAP.NP sometimes indicate the index of the last enabled
 135          * port, at other times, that of the last possible port, so
 136          * determining the maximum port number requires looking at
 137          * both CAP.NP and port_map.
 138          */
 139         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 140
 141         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 142         if (!host) {
 143                 rc = -ENOMEM;
 144                 goto err0;
 145         }
 146
 147         host->private_data = hpriv;
 148
 149         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 150                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 151         else
 152                 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
 153
 154         if (pi.flags & ATA_FLAG_EM)
 155                 ahci_reset_em(host);
 156
 157         for (i = 0; i < host->n_ports; i++) {
 158                 struct ata_port *ap = host->ports[i];
 159
 160                 ata_port_desc(ap, "mmio %pR", mem);
 161                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 162
 163                 /* set enclosure management message type */
 164                 if (ap->flags & ATA_FLAG_EM)
 165                         ap->em_message_type = hpriv->em_msg_type;
 166
 167                 /* disabled/not-implemented port */
 168                 if (!(hpriv->port_map & (1 << i)))
 169                         ap->ops = &ata_dummy_port_ops;
 170         }
 171
 172         rc = ahci_reset_controller(host);
 173         if (rc)
 174                 goto err0;
 175
 176         ahci_init_controller(host);
 177         ahci_print_info(host, "platform");
 178
 179         rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 180                                &ahci_platform_sht);
 181         if (rc)
 182                 goto err0;
 183
 184         return 0;
 185 err0:
 186         if (pdata && pdata->exit)
 187                 pdata->exit(dev);
 188         return rc;
 189 }
 190
 191 static int __devexit ahci_remove(struct platform_device *pdev)
 192 {
 193         struct device *dev = &pdev->dev;
 194         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 195         struct ata_host *host = dev_get_drvdata(dev);
 196
 197         ata_host_detach(host);
 198
 199         if (pdata && pdata->exit)
 200                 pdata->exit(dev);
 201
 202         return 0;
 203 }
 204
 205 #ifdef CONFIG_PM
 206 static int ahci_suspend(struct device *dev)
 207 {
 208         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 209         struct ata_host *host = dev_get_drvdata(dev);
 210         struct ahci_host_priv *hpriv = host->private_data;
 211         void __iomem *mmio = hpriv->mmio;
 212         u32 ctl;
 213         int rc;
 214
 215         if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 216                 dev_err(dev, "firmware update required for suspend/resume\n");
 217                 return -EIO;
 218         }
 219
 220         /*
 221          * AHCI spec rev1.1 section 8.3.3:
 222          * Software must disable interrupts prior to requesting a
 223          * transition of the HBA to D3 state.
 224          */
 225         ctl = readl(mmio + HOST_CTL);
 226         ctl &= ~HOST_IRQ_EN;
 227         writel(ctl, mmio + HOST_CTL);
 228         readl(mmio + HOST_CTL); /* flush */
 229
 230         rc = ata_host_suspend(host, PMSG_SUSPEND);
 231         if (rc)
 232                 return rc;
 233
 234         if (pdata && pdata->suspend)
 235                 return pdata->suspend(dev);
 236         return 0;
 237 }
 238
 239 static int ahci_resume(struct device *dev)
 240 {
 241         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 242         struct ata_host *host = dev_get_drvdata(dev);
 243         int rc;
 244
 245         if (pdata && pdata->resume) {
 246                 rc = pdata->resume(dev);
 247                 if (rc)
 248                         return rc;
 249         }
 250
 251         if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
 252                 rc = ahci_reset_controller(host);
 253                 if (rc)
 254                         return rc;
 255
 256                 ahci_init_controller(host);
 257         }
 258
 259         ata_host_resume(host);
 260
 261         return 0;
 262 }
 263
 264 static struct dev_pm_ops ahci_pm_ops = {
 265         .suspend                = &ahci_suspend,
 266         .resume                 = &ahci_resume,
 267 };
 268 #endif
 269
 270 static const struct of_device_id ahci_of_match[] = {
 271         { .compatible = "calxeda,hb-ahci", },
 272         {},
 273 };
 274 MODULE_DEVICE_TABLE(of, ahci_of_match);
 275
 276 static struct platform_driver ahci_driver = {
 277         .remove = __devexit_p(ahci_remove),
 278         .driver = {
 279                 .name = "ahci",
 280                 .owner = THIS_MODULE,
 281                 .of_match_table = ahci_of_match,
 282 #ifdef CONFIG_PM
 283                 .pm = &ahci_pm_ops,
 284 #endif
 285         },
 286         .id_table       = ahci_devtype,
 287 };
 288
 289 static int __init ahci_init(void)
 290 {
 291         return platform_driver_probe(&ahci_driver, ahci_probe);
 292 }
 293 module_init(ahci_init);
 294
 295 static void __exit ahci_exit(void)
 296 {
 297         platform_driver_unregister(&ahci_driver);
 298 }
 299 module_exit(ahci_exit);
 300
 301 MODULE_DESCRIPTION("AHCI SATA platform driver");
 302 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 303 MODULE_LICENSE("GPL");
 304 MODULE_ALIAS("platform:ahci");