drivers/ata/ahci_mvebu.c

   1 /*
   2  * AHCI glue platform driver for Marvell EBU SOCs
   3  *
   4  * Copyright (C) 2014 Marvell
   5  *
   6  * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   7  * Marcin Wojtas <mw@semihalf.com>
   8  *
   9  * This file is licensed under the terms of the GNU General Public
  10  * License version 2.  This program is licensed "as is" without any
  11  * warranty of any kind, whether express or implied.
  12  */
  13
  14 #include <linux/ahci_platform.h>
  15 #include <linux/kernel.h>
  16 #include <linux/mbus.h>
  17 #include <linux/module.h>
  18 #include <linux/of_device.h>
  19 #include <linux/platform_device.h>
  20 #include "ahci.h"
  21
  22 #define AHCI_VENDOR_SPECIFIC_0_ADDR  0xa0
  23 #define AHCI_VENDOR_SPECIFIC_0_DATA  0xa4
  24
  25 #define AHCI_WINDOW_CTRL(win)   (0x60 + ((win) << 4))
  26 #define AHCI_WINDOW_BASE(win)   (0x64 + ((win) << 4))
  27 #define AHCI_WINDOW_SIZE(win)   (0x68 + ((win) << 4))
  28
  29 static void ahci_mvebu_mbus_config(struct ahci_host_priv *hpriv,
  30                                    const struct mbus_dram_target_info *dram)
  31 {
  32         int i;
  33
  34         for (i = 0; i < 4; i++) {
  35                 writel(0, hpriv->mmio + AHCI_WINDOW_CTRL(i));
  36                 writel(0, hpriv->mmio + AHCI_WINDOW_BASE(i));
  37                 writel(0, hpriv->mmio + AHCI_WINDOW_SIZE(i));
  38         }
  39
  40         for (i = 0; i < dram->num_cs; i++) {
  41                 const struct mbus_dram_window *cs = dram->cs + i;
  42
  43                 writel((cs->mbus_attr << 8) |
  44                        (dram->mbus_dram_target_id << 4) | 1,
  45                        hpriv->mmio + AHCI_WINDOW_CTRL(i));
  46                 writel(cs->base, hpriv->mmio + AHCI_WINDOW_BASE(i));
  47                 writel(((cs->size - 1) & 0xffff0000),
  48                        hpriv->mmio + AHCI_WINDOW_SIZE(i));
  49         }
  50 }
  51
  52 static void ahci_mvebu_regret_option(struct ahci_host_priv *hpriv)
  53 {
  54         /*
  55          * Enable the regret bit to allow the SATA unit to regret a
  56          * request that didn't receive an acknowlegde and avoid a
  57          * deadlock
  58          */
  59         writel(0x4, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_ADDR);
  60         writel(0x80, hpriv->mmio + AHCI_VENDOR_SPECIFIC_0_DATA);
  61 }
  62
  63 static const struct ata_port_info ahci_mvebu_port_info = {
  64         .flags     = AHCI_FLAG_COMMON,
  65         .pio_mask  = ATA_PIO4,
  66         .udma_mask = ATA_UDMA6,
  67         .port_ops  = &ahci_platform_ops,
  68 };
  69
  70 static int ahci_mvebu_probe(struct platform_device *pdev)
  71 {
  72         struct ahci_host_priv *hpriv;
  73         const struct mbus_dram_target_info *dram;
  74         int rc;
  75
  76         hpriv = ahci_platform_get_resources(pdev);
  77         if (IS_ERR(hpriv))
  78                 return PTR_ERR(hpriv);
  79
  80         rc = ahci_platform_enable_resources(hpriv);
  81         if (rc)
  82                 return rc;
  83
  84         dram = mv_mbus_dram_info();
  85         if (!dram)
  86                 return -ENODEV;
  87
  88         ahci_mvebu_mbus_config(hpriv, dram);
  89         ahci_mvebu_regret_option(hpriv);
  90
  91         rc = ahci_platform_init_host(pdev, hpriv, &ahci_mvebu_port_info);
  92         if (rc)
  93                 goto disable_resources;
  94
  95         return 0;
  96
  97 disable_resources:
  98         ahci_platform_disable_resources(hpriv);
  99         return rc;
 100 }
 101
 102 static const struct of_device_id ahci_mvebu_of_match[] = {
 103         { .compatible = "marvell,armada-380-ahci", },
 104         { },
 105 };
 106 MODULE_DEVICE_TABLE(of, ahci_mvebu_of_match);
 107
 108 /*
 109  * We currently don't provide power management related operations,
 110  * since there is no suspend/resume support at the platform level for
 111  * Armada 38x for the moment.
 112  */
 113 static struct platform_driver ahci_mvebu_driver = {
 114         .probe = ahci_mvebu_probe,
 115         .remove = ata_platform_remove_one,
 116         .driver = {
 117                 .name = "ahci-mvebu",
 118                 .of_match_table = ahci_mvebu_of_match,
 119         },
 120 };
 121 module_platform_driver(ahci_mvebu_driver);
 122
 123 MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver");
 124 MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>");
 125 MODULE_LICENSE("GPL");
 126 MODULE_ALIAS("platform:ahci_mvebu");