arch/arm/mach-ixp4xx/sg720-pci.c

   1 /*
   2  * arch/arm/mach-ixp4xx/sg720-pci.c
   3  *
   4  * SG590/SG720 board-level PCI initialization
   5  * Copyright (C) 2004-2006 SnapGear - A division of Secure Computing
   6  *
   7  * Copyright (C) 2002 Intel Corporation.
   8  * Copyright (C) 2003-2004 MontaVista Software, Inc.
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  *
  14  */
  15
  16 #include <linux/pci.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/irq.h>
  20
  21 #include <asm/mach-types.h>
  22 #include <asm/hardware.h>
  23 #include <asm/irq.h>
  24 #include <asm/mach/pci.h>
  25
  26 void __init sg720_pci_preinit(void)
  27 {
  28         /*
  29          * Check the stepping of the IXP465 CPU. If it is not A0 or A1 then
  30          * enable the MPI port for direct memory bus access. Much faster.
  31          * This is broken on older steppings, so don't enable.
  32          */
  33         if (cpu_is_ixp46x()) {
  34                 unsigned long processor_id;
  35                 asm("mrc p15, 0, %0, cr0, cr0, 0;" : "=r"(processor_id) :);
  36                 if ((processor_id & 0xf) >= 2) {
  37                         printk("MPI: enabling fast memory bus...\n");
  38                         *IXP4XX_EXP_CFG1 |= 0x80000000;
  39                 } else {
  40                         printk("MPI: disabling fast memory bus...\n");
  41                         *IXP4XX_EXP_CFG1 &= ~0x80000000;
  42                 }
  43         }
  44
  45         printk("PCI: reset bus...\n");
  46         gpio_line_set(13, 0);
  47         gpio_line_config(13, IXP4XX_GPIO_OUT);
  48         gpio_line_set(13, 0);
  49         mdelay(50);
  50         gpio_line_set(13, 1);
  51         mdelay(50);
  52
  53         gpio_line_config(8, IXP4XX_GPIO_IN);
  54         set_irq_type(IRQ_IXP4XX_GPIO8, IRQT_LOW); /* INTA */
  55         gpio_line_config(9, IXP4XX_GPIO_IN);
  56         set_irq_type(IRQ_IXP4XX_GPIO9, IRQT_LOW); /* INTB */
  57
  58         ixp4xx_pci_preinit();
  59 }
  60
  61 static int __init sg720_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
  62 {
  63 #if defined(CONFIG_MACH_SG590)
  64         if (slot == 12)
  65                 return IRQ_SG590_PCI_INTA;
  66         else if (slot == 13)
  67                 return IRQ_SG590_PCI_INTA;
  68 #elif defined(CONFIG_MACH_SG720)
  69         if (slot == 12)
  70                 return IRQ_SG720_PCI_INTB;
  71         else if (slot == 13)
  72                 return IRQ_SG720_PCI_INTB;
  73         else if (slot == 14)
  74                 return IRQ_SG720_PCI_INTA;
  75         else if (slot == 15)
  76                 return IRQ_SG720_PCI_INTA;
  77 #endif
  78         return -1;
  79 }
  80
  81 struct hw_pci sg720_pci __initdata = {
  82         .nr_controllers = 1,
  83         .preinit        = sg720_pci_preinit,
  84         .swizzle        = pci_std_swizzle,
  85         .setup          = ixp4xx_setup,
  86         .scan           = ixp4xx_scan_bus,
  87         .map_irq        = sg720_map_irq,
  88 };
  89
  90 int __init sg720_pci_init(void)
  91 {
  92         if (machine_is_sg720() || machine_is_sg590())
  93                 pci_common_init(&sg720_pci);
  94         return 0;
  95 }
  96
  97 subsys_initcall(sg720_pci_init);
  98