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