arch/arm/mach-orion5x/board-rd88f5182.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * arch/arm/mach-orion5x/rd88f5182-setup.c
   4  *
   5  * Marvell Orion-NAS Reference Design Setup
   6  *
   7  * Maintainer: Ronen Shitrit <rshitrit@marvell.com>
   8  */
   9 #include <linux/gpio.h>
  10 #include <linux/kernel.h>
  11 #include <linux/init.h>
  12 #include <linux/of.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/pci.h>
  15 #include <linux/irq.h>
  16 #include <asm/mach-types.h>
  17 #include <asm/mach/arch.h>
  18 #include <asm/mach/pci.h>
  19 #include "common.h"
  20 #include "orion5x.h"
  21
  22 /*****************************************************************************
  23  * RD-88F5182 Info
  24  ****************************************************************************/
  25
  26 /*
  27  * PCI
  28  */
  29
  30 #define RD88F5182_PCI_SLOT0_OFFS        7
  31 #define RD88F5182_PCI_SLOT0_IRQ_A_PIN   7
  32 #define RD88F5182_PCI_SLOT0_IRQ_B_PIN   6
  33
  34 /*****************************************************************************
  35  * PCI
  36  ****************************************************************************/
  37
  38 static void __init rd88f5182_pci_preinit(void)
  39 {
  40         int pin;
  41
  42         /*
  43          * Configure PCI GPIO IRQ pins
  44          */
  45         pin = RD88F5182_PCI_SLOT0_IRQ_A_PIN;
  46         if (gpio_request(pin, "PCI IntA") == 0) {
  47                 if (gpio_direction_input(pin) == 0) {
  48                         irq_set_irq_type(gpio_to_irq(pin), IRQ_TYPE_LEVEL_LOW);
  49                 } else {
  50                         printk(KERN_ERR "rd88f5182_pci_preinit failed to "
  51                                         "set_irq_type pin %d\n", pin);
  52                         gpio_free(pin);
  53                 }
  54         } else {
  55                 printk(KERN_ERR "rd88f5182_pci_preinit failed to request gpio %d\n", pin);
  56         }
  57
  58         pin = RD88F5182_PCI_SLOT0_IRQ_B_PIN;
  59         if (gpio_request(pin, "PCI IntB") == 0) {
  60                 if (gpio_direction_input(pin) == 0) {
  61                         irq_set_irq_type(gpio_to_irq(pin), IRQ_TYPE_LEVEL_LOW);
  62                 } else {
  63                         printk(KERN_ERR "rd88f5182_pci_preinit failed to "
  64                                         "set_irq_type pin %d\n", pin);
  65                         gpio_free(pin);
  66                 }
  67         } else {
  68                 printk(KERN_ERR "rd88f5182_pci_preinit failed to gpio_request %d\n", pin);
  69         }
  70 }
  71
  72 static int __init rd88f5182_pci_map_irq(const struct pci_dev *dev, u8 slot,
  73         u8 pin)
  74 {
  75         int irq;
  76
  77         /*
  78          * Check for devices with hard-wired IRQs.
  79          */
  80         irq = orion5x_pci_map_irq(dev, slot, pin);
  81         if (irq != -1)
  82                 return irq;
  83
  84         /*
  85          * PCI IRQs are connected via GPIOs
  86          */
  87         switch (slot - RD88F5182_PCI_SLOT0_OFFS) {
  88         case 0:
  89                 if (pin == 1)
  90                         return gpio_to_irq(RD88F5182_PCI_SLOT0_IRQ_A_PIN);
  91                 else
  92                         return gpio_to_irq(RD88F5182_PCI_SLOT0_IRQ_B_PIN);
  93         default:
  94                 return -1;
  95         }
  96 }
  97
  98 static struct hw_pci rd88f5182_pci __initdata = {
  99         .nr_controllers = 2,
 100         .preinit        = rd88f5182_pci_preinit,
 101         .setup          = orion5x_pci_sys_setup,
 102         .scan           = orion5x_pci_sys_scan_bus,
 103         .map_irq        = rd88f5182_pci_map_irq,
 104 };
 105
 106 static int __init rd88f5182_pci_init(void)
 107 {
 108         if (of_machine_is_compatible("marvell,rd-88f5182-nas"))
 109                 pci_common_init(&rd88f5182_pci);
 110
 111         return 0;
 112 }
 113
 114 subsys_initcall(rd88f5182_pci_init);