arch/arm/mach-orion5x/board-mss2.c

   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  ****************************************************************************/
  27 static 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
  41 static 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
  48 static int __init mss2_pci_init(void)
  49 {
  50         if (machine_is_mss2())
  51                 pci_common_init(&mss2_pci);
  52
  53         return 0;
  54 }
  55 subsys_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  */
  66 static 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
  82 void __init mss2_init(void)
  83 {
  84         /* register mss2 specific power-off method */
  85         pm_power_off = mss2_power_off;
  86 }