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