linux/drivers/ata/ahci_mvebu.c
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   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
  29static 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
  52static 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
  63static 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
  70static 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
  97disable_resources:
  98        ahci_platform_disable_resources(hpriv);
  99        return rc;
 100}
 101
 102static const struct of_device_id ahci_mvebu_of_match[] = {
 103        { .compatible = "marvell,armada-380-ahci", },
 104        { },
 105};
 106MODULE_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 */
 113static 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};
 121module_platform_driver(ahci_mvebu_driver);
 122
 123MODULE_DESCRIPTION("Marvell EBU AHCI SATA driver");
 124MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>, Marcin Wojtas <mw@semihalf.com>");
 125MODULE_LICENSE("GPL");
 126MODULE_ALIAS("platform:ahci_mvebu");
 127
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