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/pm.h>
  19 #include <linux/init.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/device.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/libata.h>
  24 #include <linux/ahci_platform.h>
  25 #include "ahci.h"
  26
  27 enum ahci_type {
  28         AHCI,           /* standard platform ahci */
  29         IMX53_AHCI,     /* ahci on i.mx53 */
  30         STRICT_AHCI,    /* delayed DMA engine start */
  31 };
  32
  33 static struct platform_device_id ahci_devtype[] = {
  34         {
  35                 .name = "ahci",
  36                 .driver_data = AHCI,
  37         }, {
  38                 .name = "imx53-ahci",
  39                 .driver_data = IMX53_AHCI,
  40         }, {
  41                 .name = "strict-ahci",
  42                 .driver_data = STRICT_AHCI,
  43         }, {
  44                 /* sentinel */
  45         }
  46 };
  47 MODULE_DEVICE_TABLE(platform, ahci_devtype);
  48
  49
  50 static const struct ata_port_info ahci_port_info[] = {
  51         /* by features */
  52         [AHCI] = {
  53                 .flags          = AHCI_FLAG_COMMON,
  54                 .pio_mask       = ATA_PIO4,
  55                 .udma_mask      = ATA_UDMA6,
  56                 .port_ops       = &ahci_ops,
  57         },
  58         [IMX53_AHCI] = {
  59                 .flags          = AHCI_FLAG_COMMON,
  60                 .pio_mask       = ATA_PIO4,
  61                 .udma_mask      = ATA_UDMA6,
  62                 .port_ops       = &ahci_pmp_retry_srst_ops,
  63         },
  64         [STRICT_AHCI] = {
  65                 AHCI_HFLAGS     (AHCI_HFLAG_DELAY_ENGINE),
  66                 .flags          = AHCI_FLAG_COMMON,
  67                 .pio_mask       = ATA_PIO4,
  68                 .udma_mask      = ATA_UDMA6,
  69                 .port_ops       = &ahci_ops,
  70         },
  71 };
  72
  73 static struct scsi_host_template ahci_platform_sht = {
  74         AHCI_SHT("ahci_platform"),
  75 };
  76
  77 static int __init ahci_probe(struct platform_device *pdev)
  78 {
  79         struct device *dev = &pdev->dev;
  80         struct ahci_platform_data *pdata = dev_get_platdata(dev);
  81         const struct platform_device_id *id = platform_get_device_id(pdev);
  82         struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
  83         const struct ata_port_info *ppi[] = { &pi, NULL };
  84         struct ahci_host_priv *hpriv;
  85         struct ata_host *host;
  86         struct resource *mem;
  87         int irq;
  88         int n_ports;
  89         int i;
  90         int rc;
  91
  92         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  93         if (!mem) {
  94                 dev_err(dev, "no mmio space\n");
  95                 return -EINVAL;
  96         }
  97
  98         irq = platform_get_irq(pdev, 0);
  99         if (irq <= 0) {
 100                 dev_err(dev, "no irq\n");
 101                 return -EINVAL;
 102         }
 103
 104         if (pdata && pdata->ata_port_info)
 105                 pi = *pdata->ata_port_info;
 106
 107         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 108         if (!hpriv) {
 109                 dev_err(dev, "can't alloc ahci_host_priv\n");
 110                 return -ENOMEM;
 111         }
 112
 113         hpriv->flags |= (unsigned long)pi.private_data;
 114
 115         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
 116         if (!hpriv->mmio) {
 117                 dev_err(dev, "can't map %pR\n", mem);
 118                 return -ENOMEM;
 119         }
 120
 121         /*
 122          * Some platforms might need to prepare for mmio region access,
 123          * which could be done in the following init call. So, the mmio
 124          * region shouldn't be accessed before init (if provided) has
 125          * returned successfully.
 126          */
 127         if (pdata && pdata->init) {
 128                 rc = pdata->init(dev, hpriv->mmio);
 129                 if (rc)
 130                         return rc;
 131         }
 132
 133         ahci_save_initial_config(dev, hpriv,
 134                 pdata ? pdata->force_port_map : 0,
 135                 pdata ? pdata->mask_port_map  : 0);
 136
 137         /* prepare host */
 138         if (hpriv->cap & HOST_CAP_NCQ)
 139                 pi.flags |= ATA_FLAG_NCQ;
 140
 141         if (hpriv->cap & HOST_CAP_PMP)
 142                 pi.flags |= ATA_FLAG_PMP;
 143
 144         ahci_set_em_messages(hpriv, &pi);
 145
 146         /* CAP.NP sometimes indicate the index of the last enabled
 147          * port, at other times, that of the last possible port, so
 148          * determining the maximum port number requires looking at
 149          * both CAP.NP and port_map.
 150          */
 151         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 152
 153         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 154         if (!host) {
 155                 rc = -ENOMEM;
 156                 goto err0;
 157         }
 158
 159         host->private_data = hpriv;
 160
 161         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 162                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 163         else
 164                 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
 165
 166         if (pi.flags & ATA_FLAG_EM)
 167                 ahci_reset_em(host);
 168
 169         for (i = 0; i < host->n_ports; i++) {
 170                 struct ata_port *ap = host->ports[i];
 171
 172                 ata_port_desc(ap, "mmio %pR", mem);
 173                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 174
 175                 /* set enclosure management message type */
 176                 if (ap->flags & ATA_FLAG_EM)
 177                         ap->em_message_type = hpriv->em_msg_type;
 178
 179                 /* disabled/not-implemented port */
 180                 if (!(hpriv->port_map & (1 << i)))
 181                         ap->ops = &ata_dummy_port_ops;
 182         }
 183
 184         rc = ahci_reset_controller(host);
 185         if (rc)
 186                 goto err0;
 187
 188         ahci_init_controller(host);
 189         ahci_print_info(host, "platform");
 190
 191         rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 192                                &ahci_platform_sht);
 193         if (rc)
 194                 goto err0;
 195
 196         return 0;
 197 err0:
 198         if (pdata && pdata->exit)
 199                 pdata->exit(dev);
 200         return rc;
 201 }
 202
 203 static int __devexit ahci_remove(struct platform_device *pdev)
 204 {
 205         struct device *dev = &pdev->dev;
 206         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 207         struct ata_host *host = dev_get_drvdata(dev);
 208
 209         ata_host_detach(host);
 210
 211         if (pdata && pdata->exit)
 212                 pdata->exit(dev);
 213
 214         return 0;
 215 }
 216
 217 #ifdef CONFIG_PM
 218 static int ahci_suspend(struct device *dev)
 219 {
 220         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 221         struct ata_host *host = dev_get_drvdata(dev);
 222         struct ahci_host_priv *hpriv = host->private_data;
 223         void __iomem *mmio = hpriv->mmio;
 224         u32 ctl;
 225         int rc;
 226
 227         if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 228                 dev_err(dev, "firmware update required for suspend/resume\n");
 229                 return -EIO;
 230         }
 231
 232         /*
 233          * AHCI spec rev1.1 section 8.3.3:
 234          * Software must disable interrupts prior to requesting a
 235          * transition of the HBA to D3 state.
 236          */
 237         ctl = readl(mmio + HOST_CTL);
 238         ctl &= ~HOST_IRQ_EN;
 239         writel(ctl, mmio + HOST_CTL);
 240         readl(mmio + HOST_CTL); /* flush */
 241
 242         rc = ata_host_suspend(host, PMSG_SUSPEND);
 243         if (rc)
 244                 return rc;
 245
 246         if (pdata && pdata->suspend)
 247                 return pdata->suspend(dev);
 248         return 0;
 249 }
 250
 251 static int ahci_resume(struct device *dev)
 252 {
 253         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 254         struct ata_host *host = dev_get_drvdata(dev);
 255         int rc;
 256
 257         if (pdata && pdata->resume) {
 258                 rc = pdata->resume(dev);
 259                 if (rc)
 260                         return rc;
 261         }
 262
 263         if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
 264                 rc = ahci_reset_controller(host);
 265                 if (rc)
 266                         return rc;
 267
 268                 ahci_init_controller(host);
 269         }
 270
 271         ata_host_resume(host);
 272
 273         return 0;
 274 }
 275 #endif
 276
 277 SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
 278
 279 static const struct of_device_id ahci_of_match[] = {
 280         { .compatible = "calxeda,hb-ahci", },
 281         { .compatible = "snps,spear-ahci", },
 282         {},
 283 };
 284 MODULE_DEVICE_TABLE(of, ahci_of_match);
 285
 286 static struct platform_driver ahci_driver = {
 287         .remove = __devexit_p(ahci_remove),
 288         .driver = {
 289                 .name = "ahci",
 290                 .owner = THIS_MODULE,
 291                 .of_match_table = ahci_of_match,
 292                 .pm = &ahci_pm_ops,
 293         },
 294         .id_table       = ahci_devtype,
 295 };
 296
 297 static int __init ahci_init(void)
 298 {
 299         return platform_driver_probe(&ahci_driver, ahci_probe);
 300 }
 301 module_init(ahci_init);
 302
 303 static void __exit ahci_exit(void)
 304 {
 305         platform_driver_unregister(&ahci_driver);
 306 }
 307 module_exit(ahci_exit);
 308
 309 MODULE_DESCRIPTION("AHCI SATA platform driver");
 310 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 311 MODULE_LICENSE("GPL");
 312 MODULE_ALIAS("platform:ahci");