arch/arm/mach-pxa/cm-x2xx-pci.c

   1 /*
   2  * linux/arch/arm/mach-pxa/cm-x2xx-pci.c
   3  *
   4  * PCI bios-type initialisation for PCI machines
   5  *
   6  * Bits taken from various places.
   7  *
   8  * Copyright (C) 2007, 2008 Compulab, Ltd.
   9  * Mike Rapoport <mike@compulab.co.il>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/pci.h>
  18 #include <linux/init.h>
  19 #include <linux/device.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/irq.h>
  22 #include <linux/gpio.h>
  23
  24 #include <asm/mach/pci.h>
  25 #include <asm/mach-types.h>
  26
  27 #include <asm/hardware/it8152.h>
  28
  29 unsigned long it8152_base_address;
  30 static int cmx2xx_it8152_irq_gpio;
  31
  32 static void cmx2xx_it8152_irq_demux(unsigned int irq, struct irq_desc *desc)
  33 {
  34         /* clear our parent irq */
  35         desc->irq_data.chip->irq_ack(&desc->irq_data);
  36
  37         it8152_irq_demux(irq, desc);
  38 }
  39
  40 void __cmx2xx_pci_init_irq(int irq_gpio)
  41 {
  42         it8152_init_irq();
  43
  44         cmx2xx_it8152_irq_gpio = irq_gpio;
  45
  46         irq_set_irq_type(gpio_to_irq(irq_gpio), IRQ_TYPE_EDGE_RISING);
  47
  48         irq_set_chained_handler(gpio_to_irq(irq_gpio),
  49                                 cmx2xx_it8152_irq_demux);
  50 }
  51
  52 #ifdef CONFIG_PM
  53 static unsigned long sleep_save_ite[10];
  54
  55 void __cmx2xx_pci_suspend(void)
  56 {
  57         /* save ITE state */
  58         sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR);
  59         sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR);
  60         sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR);
  61
  62         /* Clear ITE IRQ's */
  63         __raw_writel((0), IT8152_INTC_PDCNIRR);
  64         __raw_writel((0), IT8152_INTC_LPCNIRR);
  65 }
  66
  67 void __cmx2xx_pci_resume(void)
  68 {
  69         /* restore IT8152 state */
  70         __raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR);
  71         __raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR);
  72         __raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR);
  73 }
  74 #else
  75 void cmx2xx_pci_suspend(void) {}
  76 void cmx2xx_pci_resume(void) {}
  77 #endif
  78
  79 /* PCI IRQ mapping*/
  80 static int __init cmx2xx_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
  81 {
  82         int irq;
  83
  84         dev_dbg(&dev->dev, "%s: slot=%x, pin=%x\n", __func__, slot, pin);
  85
  86         irq = it8152_pci_map_irq(dev, slot, pin);
  87         if (irq)
  88                 return irq;
  89
  90         /*
  91           Here comes the ugly part. The routing is baseboard specific,
  92           but defining a platform for each possible base of CM-X2XX is
  93           unrealistic. Here we keep mapping for ATXBase and SB-X2XX.
  94         */
  95         /* ATXBASE PCI slot */
  96         if (slot == 7)
  97                 return IT8152_PCI_INTA;
  98
  99         /* ATXBase/SB-X2XX CardBus */
 100         if (slot == 8 || slot == 0)
 101                 return IT8152_PCI_INTB;
 102
 103         /* ATXBase Ethernet */
 104         if (slot == 9)
 105                 return IT8152_PCI_INTA;
 106
 107         /* CM-x255 Onboard Ethernet */
 108         if (slot == 15)
 109                 return IT8152_PCI_INTC;
 110
 111         /* SB-x2xx Ethernet */
 112         if (slot == 16)
 113                 return IT8152_PCI_INTA;
 114
 115         /* PC104+ interrupt routing */
 116         if ((slot == 17) || (slot == 19))
 117                 return IT8152_PCI_INTA;
 118         if ((slot == 18) || (slot == 20))
 119                 return IT8152_PCI_INTB;
 120
 121         return(0);
 122 }
 123
 124 static void cmx2xx_pci_preinit(void)
 125 {
 126         pr_info("Initializing CM-X2XX PCI subsystem\n");
 127
 128         pcibios_min_io = 0;
 129         pcibios_min_mem = 0;
 130
 131         __raw_writel(0x800, IT8152_PCI_CFG_ADDR);
 132         if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) {
 133                 pr_info("PCI Bridge found.\n");
 134
 135                 /* set PCI I/O base at 0 */
 136                 writel(0x848, IT8152_PCI_CFG_ADDR);
 137                 writel(0, IT8152_PCI_CFG_DATA);
 138
 139                 /* set PCI memory base at 0 */
 140                 writel(0x840, IT8152_PCI_CFG_ADDR);
 141                 writel(0, IT8152_PCI_CFG_DATA);
 142
 143                 writel(0x20, IT8152_GPIO_GPDR);
 144
 145                 /* CardBus Controller on ATXbase baseboard */
 146                 writel(0x4000, IT8152_PCI_CFG_ADDR);
 147                 if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) {
 148                         pr_info("CardBus Bridge found.\n");
 149
 150                         /* Configure socket 0 */
 151                         writel(0x408C, IT8152_PCI_CFG_ADDR);
 152                         writel(0x1022, IT8152_PCI_CFG_DATA);
 153
 154                         writel(0x4080, IT8152_PCI_CFG_ADDR);
 155                         writel(0x3844d060, IT8152_PCI_CFG_DATA);
 156
 157                         writel(0x4090, IT8152_PCI_CFG_ADDR);
 158                         writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
 159                                 0x60440000),
 160                                IT8152_PCI_CFG_DATA);
 161
 162                         writel(0x4018, IT8152_PCI_CFG_ADDR);
 163                         writel(0xb0000000, IT8152_PCI_CFG_DATA);
 164
 165                         /* Configure socket 1 */
 166                         writel(0x418C, IT8152_PCI_CFG_ADDR);
 167                         writel(0x1022, IT8152_PCI_CFG_DATA);
 168
 169                         writel(0x4180, IT8152_PCI_CFG_ADDR);
 170                         writel(0x3844d060, IT8152_PCI_CFG_DATA);
 171
 172                         writel(0x4190, IT8152_PCI_CFG_ADDR);
 173                         writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) |
 174                                 0x60440000),
 175                                IT8152_PCI_CFG_DATA);
 176
 177                         writel(0x4118, IT8152_PCI_CFG_ADDR);
 178                         writel(0xb0000000, IT8152_PCI_CFG_DATA);
 179                 }
 180         }
 181 }
 182
 183 static struct hw_pci cmx2xx_pci __initdata = {
 184         .swizzle        = pci_std_swizzle,
 185         .map_irq        = cmx2xx_pci_map_irq,
 186         .nr_controllers = 1,
 187         .setup          = it8152_pci_setup,
 188         .scan           = it8152_pci_scan_bus,
 189         .preinit        = cmx2xx_pci_preinit,
 190 };
 191
 192 static int __init cmx2xx_init_pci(void)
 193 {
 194         if (machine_is_armcore())
 195                 pci_common_init(&cmx2xx_pci);
 196
 197         return 0;
 198 }
 199
 200 subsys_initcall(cmx2xx_init_pci);