linux/arch/arm/mach-orion5x/board-mss2.c
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   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * Maxtor Shared Storage II Board Setup
   4 *
   5 * Maintainer: Sylver Bruneau <sylver.bruneau@googlemail.com>
   6 */
   7
   8#include <linux/kernel.h>
   9#include <linux/init.h>
  10#include <linux/platform_device.h>
  11#include <linux/pci.h>
  12#include <linux/irq.h>
  13#include <asm/mach-types.h>
  14#include <asm/mach/arch.h>
  15#include <asm/mach/pci.h>
  16#include "orion5x.h"
  17#include "bridge-regs.h"
  18#include "common.h"
  19
  20/*****************************************************************************
  21 * Maxtor Shared Storage II Info
  22 ****************************************************************************/
  23
  24/****************************************************************************
  25 * PCI setup
  26 ****************************************************************************/
  27static int __init mss2_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  28{
  29        int irq;
  30
  31        /*
  32         * Check for devices with hard-wired IRQs.
  33         */
  34        irq = orion5x_pci_map_irq(dev, slot, pin);
  35        if (irq != -1)
  36                return irq;
  37
  38        return -1;
  39}
  40
  41static struct hw_pci mss2_pci __initdata = {
  42        .nr_controllers = 2,
  43        .setup          = orion5x_pci_sys_setup,
  44        .scan           = orion5x_pci_sys_scan_bus,
  45        .map_irq        = mss2_pci_map_irq,
  46};
  47
  48static int __init mss2_pci_init(void)
  49{
  50        if (machine_is_mss2())
  51                pci_common_init(&mss2_pci);
  52
  53        return 0;
  54}
  55subsys_initcall(mss2_pci_init);
  56
  57/*****************************************************************************
  58 * MSS2 power off method
  59 ****************************************************************************/
  60/*
  61 * On the Maxtor Shared Storage II, the shutdown process is the following :
  62 * - Userland modifies U-boot env to tell U-boot to go idle at next boot
  63 * - The board reboots
  64 * - U-boot starts and go into an idle mode until the user press "power"
  65 */
  66static void mss2_power_off(void)
  67{
  68        u32 reg;
  69
  70        /*
  71         * Enable and issue soft reset
  72         */
  73        reg = readl(RSTOUTn_MASK);
  74        reg |= 1 << 2;
  75        writel(reg, RSTOUTn_MASK);
  76
  77        reg = readl(CPU_SOFT_RESET);
  78        reg |= 1;
  79        writel(reg, CPU_SOFT_RESET);
  80}
  81
  82void __init mss2_init(void)
  83{
  84        /* register mss2 specific power-off method */
  85        pm_power_off = mss2_power_off;
  86}
  87