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 static void ahci_host_stop(struct ata_host *host);
  29
  30 enum ahci_type {
  31         AHCI,           /* standard platform ahci */
  32         IMX53_AHCI,     /* ahci on i.mx53 */
  33         STRICT_AHCI,    /* delayed DMA engine start */
  34 };
  35
  36 static struct platform_device_id ahci_devtype[] = {
  37         {
  38                 .name = "ahci",
  39                 .driver_data = AHCI,
  40         }, {
  41                 .name = "imx53-ahci",
  42                 .driver_data = IMX53_AHCI,
  43         }, {
  44                 .name = "strict-ahci",
  45                 .driver_data = STRICT_AHCI,
  46         }, {
  47                 /* sentinel */
  48         }
  49 };
  50 MODULE_DEVICE_TABLE(platform, ahci_devtype);
  51
  52 struct ata_port_operations ahci_platform_ops = {
  53         .inherits       = &ahci_ops,
  54         .host_stop      = ahci_host_stop,
  55 };
  56 EXPORT_SYMBOL_GPL(ahci_platform_ops);
  57
  58 static struct ata_port_operations ahci_platform_retry_srst_ops = {
  59         .inherits       = &ahci_pmp_retry_srst_ops,
  60         .host_stop      = ahci_host_stop,
  61 };
  62
  63 static const struct ata_port_info ahci_port_info[] = {
  64         /* by features */
  65         [AHCI] = {
  66                 .flags          = AHCI_FLAG_COMMON,
  67                 .pio_mask       = ATA_PIO4,
  68                 .udma_mask      = ATA_UDMA6,
  69                 .port_ops       = &ahci_platform_ops,
  70         },
  71         [IMX53_AHCI] = {
  72                 .flags          = AHCI_FLAG_COMMON,
  73                 .pio_mask       = ATA_PIO4,
  74                 .udma_mask      = ATA_UDMA6,
  75                 .port_ops       = &ahci_platform_retry_srst_ops,
  76         },
  77         [STRICT_AHCI] = {
  78                 AHCI_HFLAGS     (AHCI_HFLAG_DELAY_ENGINE),
  79                 .flags          = AHCI_FLAG_COMMON,
  80                 .pio_mask       = ATA_PIO4,
  81                 .udma_mask      = ATA_UDMA6,
  82                 .port_ops       = &ahci_platform_ops,
  83         },
  84 };
  85
  86 static struct scsi_host_template ahci_platform_sht = {
  87         AHCI_SHT("ahci_platform"),
  88 };
  89
  90 static int ahci_probe(struct platform_device *pdev)
  91 {
  92         struct device *dev = &pdev->dev;
  93         struct ahci_platform_data *pdata = dev_get_platdata(dev);
  94         const struct platform_device_id *id = platform_get_device_id(pdev);
  95         struct ata_port_info pi = ahci_port_info[id ? id->driver_data : 0];
  96         const struct ata_port_info *ppi[] = { &pi, NULL };
  97         struct ahci_host_priv *hpriv;
  98         struct ata_host *host;
  99         struct resource *mem;
 100         int irq;
 101         int n_ports;
 102         int i;
 103         int rc;
 104
 105         mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 106         if (!mem) {
 107                 dev_err(dev, "no mmio space\n");
 108                 return -EINVAL;
 109         }
 110
 111         irq = platform_get_irq(pdev, 0);
 112         if (irq <= 0) {
 113                 dev_err(dev, "no irq\n");
 114                 return -EINVAL;
 115         }
 116
 117         if (pdata && pdata->ata_port_info)
 118                 pi = *pdata->ata_port_info;
 119
 120         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 121         if (!hpriv) {
 122                 dev_err(dev, "can't alloc ahci_host_priv\n");
 123                 return -ENOMEM;
 124         }
 125
 126         hpriv->flags |= (unsigned long)pi.private_data;
 127
 128         hpriv->mmio = devm_ioremap(dev, mem->start, resource_size(mem));
 129         if (!hpriv->mmio) {
 130                 dev_err(dev, "can't map %pR\n", mem);
 131                 return -ENOMEM;
 132         }
 133
 134         hpriv->clk = clk_get(dev, NULL);
 135         if (IS_ERR(hpriv->clk)) {
 136                 dev_err(dev, "can't get clock\n");
 137         } else {
 138                 rc = clk_prepare_enable(hpriv->clk);
 139                 if (rc) {
 140                         dev_err(dev, "clock prepare enable failed");
 141                         goto free_clk;
 142                 }
 143         }
 144
 145         /*
 146          * Some platforms might need to prepare for mmio region access,
 147          * which could be done in the following init call. So, the mmio
 148          * region shouldn't be accessed before init (if provided) has
 149          * returned successfully.
 150          */
 151         if (pdata && pdata->init) {
 152                 rc = pdata->init(dev, hpriv->mmio);
 153                 if (rc)
 154                         goto disable_unprepare_clk;
 155         }
 156
 157         ahci_save_initial_config(dev, hpriv,
 158                 pdata ? pdata->force_port_map : 0,
 159                 pdata ? pdata->mask_port_map  : 0);
 160
 161         /* prepare host */
 162         if (hpriv->cap & HOST_CAP_NCQ)
 163                 pi.flags |= ATA_FLAG_NCQ;
 164
 165         if (hpriv->cap & HOST_CAP_PMP)
 166                 pi.flags |= ATA_FLAG_PMP;
 167
 168         ahci_set_em_messages(hpriv, &pi);
 169
 170         /* CAP.NP sometimes indicate the index of the last enabled
 171          * port, at other times, that of the last possible port, so
 172          * determining the maximum port number requires looking at
 173          * both CAP.NP and port_map.
 174          */
 175         n_ports = max(ahci_nr_ports(hpriv->cap), fls(hpriv->port_map));
 176
 177         host = ata_host_alloc_pinfo(dev, ppi, n_ports);
 178         if (!host) {
 179                 rc = -ENOMEM;
 180                 goto pdata_exit;
 181         }
 182
 183         host->private_data = hpriv;
 184
 185         if (!(hpriv->cap & HOST_CAP_SSS) || ahci_ignore_sss)
 186                 host->flags |= ATA_HOST_PARALLEL_SCAN;
 187         else
 188                 dev_info(dev, "SSS flag set, parallel bus scan disabled\n");
 189
 190         if (pi.flags & ATA_FLAG_EM)
 191                 ahci_reset_em(host);
 192
 193         for (i = 0; i < host->n_ports; i++) {
 194                 struct ata_port *ap = host->ports[i];
 195
 196                 ata_port_desc(ap, "mmio %pR", mem);
 197                 ata_port_desc(ap, "port 0x%x", 0x100 + ap->port_no * 0x80);
 198
 199                 /* set enclosure management message type */
 200                 if (ap->flags & ATA_FLAG_EM)
 201                         ap->em_message_type = hpriv->em_msg_type;
 202
 203                 /* disabled/not-implemented port */
 204                 if (!(hpriv->port_map & (1 << i)))
 205                         ap->ops = &ata_dummy_port_ops;
 206         }
 207
 208         rc = ahci_reset_controller(host);
 209         if (rc)
 210                 goto pdata_exit;
 211
 212         ahci_init_controller(host);
 213         ahci_print_info(host, "platform");
 214
 215         rc = ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
 216                                &ahci_platform_sht);
 217         if (rc)
 218                 goto pdata_exit;
 219
 220         return 0;
 221 pdata_exit:
 222         if (pdata && pdata->exit)
 223                 pdata->exit(dev);
 224 disable_unprepare_clk:
 225         if (!IS_ERR(hpriv->clk))
 226                 clk_disable_unprepare(hpriv->clk);
 227 free_clk:
 228         if (!IS_ERR(hpriv->clk))
 229                 clk_put(hpriv->clk);
 230         return rc;
 231 }
 232
 233 static void ahci_host_stop(struct ata_host *host)
 234 {
 235         struct device *dev = host->dev;
 236         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 237         struct ahci_host_priv *hpriv = host->private_data;
 238
 239         if (pdata && pdata->exit)
 240                 pdata->exit(dev);
 241
 242         if (!IS_ERR(hpriv->clk)) {
 243                 clk_disable_unprepare(hpriv->clk);
 244                 clk_put(hpriv->clk);
 245         }
 246 }
 247
 248 #ifdef CONFIG_PM_SLEEP
 249 static int ahci_suspend(struct device *dev)
 250 {
 251         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 252         struct ata_host *host = dev_get_drvdata(dev);
 253         struct ahci_host_priv *hpriv = host->private_data;
 254         void __iomem *mmio = hpriv->mmio;
 255         u32 ctl;
 256         int rc;
 257
 258         if (hpriv->flags & AHCI_HFLAG_NO_SUSPEND) {
 259                 dev_err(dev, "firmware update required for suspend/resume\n");
 260                 return -EIO;
 261         }
 262
 263         /*
 264          * AHCI spec rev1.1 section 8.3.3:
 265          * Software must disable interrupts prior to requesting a
 266          * transition of the HBA to D3 state.
 267          */
 268         ctl = readl(mmio + HOST_CTL);
 269         ctl &= ~HOST_IRQ_EN;
 270         writel(ctl, mmio + HOST_CTL);
 271         readl(mmio + HOST_CTL); /* flush */
 272
 273         rc = ata_host_suspend(host, PMSG_SUSPEND);
 274         if (rc)
 275                 return rc;
 276
 277         if (pdata && pdata->suspend)
 278                 return pdata->suspend(dev);
 279
 280         if (!IS_ERR(hpriv->clk))
 281                 clk_disable_unprepare(hpriv->clk);
 282
 283         return 0;
 284 }
 285
 286 static int ahci_resume(struct device *dev)
 287 {
 288         struct ahci_platform_data *pdata = dev_get_platdata(dev);
 289         struct ata_host *host = dev_get_drvdata(dev);
 290         struct ahci_host_priv *hpriv = host->private_data;
 291         int rc;
 292
 293         if (!IS_ERR(hpriv->clk)) {
 294                 rc = clk_prepare_enable(hpriv->clk);
 295                 if (rc) {
 296                         dev_err(dev, "clock prepare enable failed");
 297                         return rc;
 298                 }
 299         }
 300
 301         if (pdata && pdata->resume) {
 302                 rc = pdata->resume(dev);
 303                 if (rc)
 304                         goto disable_unprepare_clk;
 305         }
 306
 307         if (dev->power.power_state.event == PM_EVENT_SUSPEND) {
 308                 rc = ahci_reset_controller(host);
 309                 if (rc)
 310                         goto disable_unprepare_clk;
 311
 312                 ahci_init_controller(host);
 313         }
 314
 315         ata_host_resume(host);
 316
 317         return 0;
 318
 319 disable_unprepare_clk:
 320         if (!IS_ERR(hpriv->clk))
 321                 clk_disable_unprepare(hpriv->clk);
 322
 323         return rc;
 324 }
 325 #endif
 326
 327 static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_suspend, ahci_resume);
 328
 329 static const struct of_device_id ahci_of_match[] = {
 330         { .compatible = "snps,spear-ahci", },
 331         { .compatible = "snps,exynos5440-ahci", },
 332         {},
 333 };
 334 MODULE_DEVICE_TABLE(of, ahci_of_match);
 335
 336 static struct platform_driver ahci_driver = {
 337         .probe = ahci_probe,
 338         .remove = ata_platform_remove_one,
 339         .driver = {
 340                 .name = "ahci",
 341                 .owner = THIS_MODULE,
 342                 .of_match_table = ahci_of_match,
 343                 .pm = &ahci_pm_ops,
 344         },
 345         .id_table       = ahci_devtype,
 346 };
 347 module_platform_driver(ahci_driver);
 348
 349 MODULE_DESCRIPTION("AHCI SATA platform driver");
 350 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
 351 MODULE_LICENSE("GPL");
 352 MODULE_ALIAS("platform:ahci");