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/clk.h>
  16 #include <linux/kernel.h>
  17 #include <linux/gfp.h>
  18 #include <linux/module.h>
  19 #include <linux/pm.h>
  20 #include <linux/init.h>
  21 #include <linux/interrupt.h>
  22 #include <linux/device.h>
  23 #include <linux/platform_device.h>
  24 #include <linux/libata.h>
  25 #include <linux/ahci_platform.h>
  26 #include "ahci.h"
  27
  28 enum ahci_type {
  29         AHCI,           /* standard platform ahci */
  30         IMX53_AHCI,     /* ahci on i.mx53 */
  31         STRICT_AHCI,    /* delayed DMA engine start */
  32 };
  33
  34 static struct platform_device_id ahci_devtype[] = {
  35         {
  36                 .name = "ahci",
  37                 .driver_data = AHCI,
  38         }, {
  39                 .name = "imx53-ahci",
  40                 .driver_data = IMX53_AHCI,
  41         }, {
  42                 .name = "strict-ahci",
  43                 .driver_data = STRICT_AHCI,
  44         }, {
  45                 /* sentinel */
  46         }
  47 };
  48 MODULE_DEVICE_TABLE(platform, ahci_devtype);
  49
  50
  51 static const struct ata_port_info ahci_port_info[] = {
  52         /* by features */
  53         [AHCI] = {
  54                 .flags          = AHCI_FLAG_COMMON,
  55                 .pio_mask       = ATA_PIO4,
  56                 .udma_mask      = ATA_UDMA6,
  57                 .port_ops       = &ahci_ops,
  58         },
  59         [IMX53_AHCI] = {
  60                 .flags          = AHCI_FLAG_COMMON,
  61                 .pio_mask       = ATA_PIO4,
  62                 .udma_mask      = ATA_UDMA6,
  63                 .port_ops       = &ahci_pmp_retry_srst_ops,
  64         },
  65         [STRICT_AHCI] = {
  66                 AHCI_HFLAGS     (AHCI_HFLAG_DELAY_ENGINE),
  67                 .flags          = AHCI_FLAG_COMMON,
  68                 .pio_mask       = ATA_PIO4,
  69                 .udma_mask      = ATA_UDMA6,
  70                 .port_ops       = &ahci_ops,
  71         },
  72 };
  73
  74 static struct scsi_host_template ahci_platform_sht = {
  75         AHCI_SHT("ahci_platform"),
  76 };
  77
  78 static int __init ahci_probe(struct platform_device *pdev)
  79 {
  80         struct device *dev = &pdev->dev;
  81         struct ahci_platform_data *pdata = dev_get_platdata(dev);
  82         const struct platform_device_id *id = platform_get_device_id(pdev);
  83         struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
  84         const struct ata_port_info *ppi[] = { &pi, NULL };
  85         struct ahci_host_priv *hpriv;
  86         struct ata_host *host;
  87         struct resource *mem;
  88         int irq;
  89         int n_ports;
  90         int i;
  91         int rc;
  92
  93         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  94         if (!mem) {
  95                 dev_err(dev, "no mmio space\n");
  96                 return -EINVAL;
  97         }
  98
  99         irq = platform_get_irq(pdev, 0);
 100         if (irq <= 0) {
 101                 dev_err(dev, "no irq\n");
 102                 return -EINVAL;
 103         }
 104
 105         if (pdata && pdata->ata_port_info)
 106                 pi = *pdata->ata_port_info;
 107
 108         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 109         if (!hpriv) {
 110                 dev_err(dev, "can't alloc ahci_host_priv\n");
 111                 return -ENOMEM;
 112         }
 113
 114         hpriv->flags |= (unsigned long)pi.private_data;
 115
 116         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
 117         if (!hpriv->mmio) {
 118                 dev_err(dev, "can't map %pR\n", mem);
 119                 return -ENOMEM;
 120         }
 121
 122         hpriv->clk = clk_get(dev, NULL);
 123         if (IS_ERR(hpriv->clk)) {
 124                 dev_err(dev, "can't get clock\n");
 125         } else {
 126                 rc = clk_prepare_enable(hpriv->clk);
 127                 if (rc) {
 128                         dev_err(dev, "clock prepare enable failed");
 129                         goto free_clk;
 130                 }
 131         }
 132
 133         /*
 134          * Some platforms might need to prepare for mmio region access,
 135          * which could be done in the following init call. So, the mmio
 136          * region shouldn't be accessed before init (if provided) has
 137          * returned successfully.
 138          */
 139         if (pdata && pdata->init) {
 140                 rc = pdata->init(dev, hpriv->mmio);
 141                 if (rc)
 142                         goto disable_unprepare_clk;
 143         }
 144
 145         ahci_save_initial_config(dev, hpriv,
 146                 pdata ? pdata->force_port_map : 0,
 147                 pdata ? pdata->mask_port_map  : 0);
 148
 149         /* prepare host */
 150         if (hpriv->cap & HOST_CAP_NCQ)
 151                 pi.flags |= ATA_FLAG_NCQ;
 152
 153         if (hpriv->cap & HOST_CAP_PMP)
 154                 pi.flags |= ATA_FLAG_PMP;
 155
 156         ahci_set_em_messages(hpriv, &pi);
 157
 158         /* CAP.NP sometimes indicate the index of the last enabled
 159          * port, at other times, that of the last possible port, so
 160          * determining the maximum port number requires looking at
 161          * both CAP.NP and port_map.
 162          */
 163         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 164
 165         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 166         if (!host) {
 167                 rc = -ENOMEM;
 168                 goto pdata_exit;
 169         }
 170
 171         host->private_data = hpriv;
 172
 173         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 174                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 175         else
 176                 printk(KERN_INFO "ahci: SSS flag set, parallel bus scan disabled\n");
 177
 178         if (pi.flags & ATA_FLAG_EM)
 179                 ahci_reset_em(host);
 180
 181         for (i = 0; i < host->n_ports; i++) {
 182                 struct ata_port *ap = host->ports[i];
 183
 184                 ata_port_desc(ap, "mmio %pR", mem);
 185                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 186
 187                 /* set enclosure management message type */
 188                 if (ap->flags & ATA_FLAG_EM)
 189                         ap->em_message_type = hpriv->em_msg_type;
 190
 191                 /* disabled/not-implemented port */
 192                 if (!(hpriv->port_map & (1 << i)))
 193                         ap->ops = &ata_dummy_port_ops;
 194         }
 195
 196         rc = ahci_reset_controller(host);
 197         if (rc)
 198                 goto pdata_exit;
 199
 200         ahci_init_controller(host);
 201         ahci_print_info(host, "platform");
 202
 203         rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 204                                &ahci_platform_sht);
 205         if (rc)
 206                 goto pdata_exit;
 207
 208         return 0;
 209 pdata_exit:
 210         if (pdata && pdata->exit)
 211                 pdata->exit(dev);
 212 disable_unprepare_clk:
 213         if (!IS_ERR(hpriv->clk))
 214                 clk_disable_unprepare(hpriv->clk);
 215 free_clk:
 216         if (!IS_ERR(hpriv->clk))
 217                 clk_put(hpriv->clk);
 218         return rc;
 219 }
 220
 221 static int __devexit ahci_remove(struct platform_device *pdev)
 222 {
 223         struct device *dev = &pdev->dev;
 224         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 225         struct ata_host *host = dev_get_drvdata(dev);
 226         struct ahci_host_priv *hpriv = host->private_data;
 227
 228         ata_host_detach(host);
 229
 230         if (pdata && pdata->exit)
 231                 pdata->exit(dev);
 232
 233         if (!IS_ERR(hpriv->clk)) {
 234                 clk_disable_unprepare(hpriv->clk);
 235                 clk_put(hpriv->clk);
 236         }
 237
 238         return 0;
 239 }
 240
 241 #ifdef CONFIG_PM_SLEEP
 242 static int ahci_suspend(struct device *dev)
 243 {
 244         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 245         struct ata_host *host = dev_get_drvdata(dev);
 246         struct ahci_host_priv *hpriv = host->private_data;
 247         void __iomem *mmio = hpriv->mmio;
 248         u32 ctl;
 249         int rc;
 250
 251         if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 252                 dev_err(dev, "firmware update required for suspend/resume\n");
 253                 return -EIO;
 254         }
 255
 256         /*
 257          * AHCI spec rev1.1 section 8.3.3:
 258          * Software must disable interrupts prior to requesting a
 259          * transition of the HBA to D3 state.
 260          */
 261         ctl = readl(mmio + HOST_CTL);
 262         ctl &= ~HOST_IRQ_EN;
 263         writel(ctl, mmio + HOST_CTL);
 264         readl(mmio + HOST_CTL); /* flush */
 265
 266         rc = ata_host_suspend(host, PMSG_SUSPEND);
 267         if (rc)
 268                 return rc;
 269
 270         if (pdata && pdata->suspend)
 271                 return pdata->suspend(dev);
 272
 273         if (!IS_ERR(hpriv->clk))
 274                 clk_disable_unprepare(hpriv->clk);
 275
 276         return 0;
 277 }
 278
 279 static int ahci_resume(struct device *dev)
 280 {
 281         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 282         struct ata_host *host = dev_get_drvdata(dev);
 283         struct ahci_host_priv *hpriv = host->private_data;
 284         int rc;
 285
 286         if (!IS_ERR(hpriv->clk)) {
 287                 rc = clk_prepare_enable(hpriv->clk);
 288                 if (rc) {
 289                         dev_err(dev, "clock prepare enable failed");
 290                         return rc;
 291                 }
 292         }
 293
 294         if (pdata && pdata->resume) {
 295                 rc = pdata->resume(dev);
 296                 if (rc)
 297                         goto disable_unprepare_clk;
 298         }
 299
 300         if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
 301                 rc = ahci_reset_controller(host);
 302                 if (rc)
 303                         goto disable_unprepare_clk;
 304
 305                 ahci_init_controller(host);
 306         }
 307
 308         ata_host_resume(host);
 309
 310         return 0;
 311
 312 disable_unprepare_clk:
 313         if (!IS_ERR(hpriv->clk))
 314                 clk_disable_unprepare(hpriv->clk);
 315
 316         return rc;
 317 }
 318 #endif
 319
 320 SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
 321
 322 static const struct of_device_id ahci_of_match[] = {
 323         { .compatible = "snps,spear-ahci", },
 324         {},
 325 };
 326 MODULE_DEVICE_TABLE(of, ahci_of_match);
 327
 328 static struct platform_driver ahci_driver = {
 329         .remove = __devexit_p(ahci_remove),
 330         .driver = {
 331                 .name = "ahci",
 332                 .owner = THIS_MODULE,
 333                 .of_match_table = ahci_of_match,
 334                 .pm = &ahci_pm_ops,
 335         },
 336         .id_table       = ahci_devtype,
 337 };
 338
 339 static int __init ahci_init(void)
 340 {
 341         return platform_driver_probe(&ahci_driver, ahci_probe);
 342 }
 343 module_init(ahci_init);
 344
 345 static void __exit ahci_exit(void)
 346 {
 347         platform_driver_unregister(&ahci_driver);
 348 }
 349 module_exit(ahci_exit);
 350
 351 MODULE_DESCRIPTION("AHCI SATA platform driver");
 352 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 353 MODULE_LICENSE("GPL");
 354 MODULE_ALIAS("platform:ahci");