Mike Rapoport | 3696a8a | 2007-09-23 15:59:26 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * linux/arch/arm/mach-pxa/cm-x270-pci.c |
| 3 | * |
| 4 | * PCI bios-type initialisation for PCI machines |
| 5 | * |
| 6 | * Bits taken from various places. |
| 7 | * |
| 8 | * Copyright (C) 2007 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 | |
| 23 | #include <asm/mach/pci.h> |
| 24 | #include <asm/arch/cm-x270.h> |
| 25 | #include <asm/arch/pxa-regs.h> |
| 26 | #include <asm/mach-types.h> |
| 27 | |
| 28 | #include <asm/hardware/it8152.h> |
| 29 | |
| 30 | unsigned long it8152_base_address = CMX270_IT8152_VIRT; |
| 31 | |
| 32 | /* |
| 33 | * Only first 64MB of memory can be accessed via PCI. |
| 34 | * We use GFP_DMA to allocate safe buffers to do map/unmap. |
| 35 | * This is really ugly and we need a better way of specifying |
| 36 | * DMA-capable regions of memory. |
| 37 | */ |
| 38 | void __init cmx270_pci_adjust_zones(int node, unsigned long *zone_size, |
| 39 | unsigned long *zhole_size) |
| 40 | { |
| 41 | unsigned int sz = SZ_64M >> PAGE_SHIFT; |
| 42 | |
| 43 | printk(KERN_INFO "Adjusting zones for CM-x270\n"); |
| 44 | |
| 45 | /* |
| 46 | * Only adjust if > 64M on current system |
| 47 | */ |
| 48 | if (node || (zone_size[0] <= sz)) |
| 49 | return; |
| 50 | |
| 51 | zone_size[1] = zone_size[0] - sz; |
| 52 | zone_size[0] = sz; |
| 53 | zhole_size[1] = zhole_size[0]; |
| 54 | zhole_size[0] = 0; |
| 55 | } |
| 56 | |
| 57 | static void cmx270_it8152_irq_demux(unsigned int irq, struct irq_desc *desc) |
| 58 | { |
| 59 | /* clear our parent irq */ |
| 60 | GEDR(GPIO_IT8152_IRQ) = GPIO_bit(GPIO_IT8152_IRQ); |
| 61 | |
| 62 | it8152_irq_demux(irq, desc); |
| 63 | } |
| 64 | |
| 65 | void __cmx270_pci_init_irq(void) |
| 66 | { |
| 67 | it8152_init_irq(); |
| 68 | pxa_gpio_mode(IRQ_TO_GPIO(GPIO_IT8152_IRQ)); |
| 69 | set_irq_type(IRQ_GPIO(GPIO_IT8152_IRQ), IRQT_RISING); |
| 70 | |
| 71 | set_irq_chained_handler(IRQ_GPIO(GPIO_IT8152_IRQ), |
| 72 | cmx270_it8152_irq_demux); |
| 73 | } |
| 74 | |
| 75 | #ifdef CONFIG_PM |
| 76 | static unsigned long sleep_save_ite[10]; |
| 77 | |
| 78 | void __cmx270_pci_suspend(void) |
| 79 | { |
| 80 | /* save ITE state */ |
| 81 | sleep_save_ite[0] = __raw_readl(IT8152_INTC_PDCNIMR); |
| 82 | sleep_save_ite[1] = __raw_readl(IT8152_INTC_LPCNIMR); |
| 83 | sleep_save_ite[2] = __raw_readl(IT8152_INTC_LPNIAR); |
| 84 | |
| 85 | /* Clear ITE IRQ's */ |
| 86 | __raw_writel((0), IT8152_INTC_PDCNIRR); |
| 87 | __raw_writel((0), IT8152_INTC_LPCNIRR); |
| 88 | } |
| 89 | |
| 90 | void __cmx270_pci_resume(void) |
| 91 | { |
| 92 | /* restore IT8152 state */ |
| 93 | __raw_writel((sleep_save_ite[0]), IT8152_INTC_PDCNIMR); |
| 94 | __raw_writel((sleep_save_ite[1]), IT8152_INTC_LPCNIMR); |
| 95 | __raw_writel((sleep_save_ite[2]), IT8152_INTC_LPNIAR); |
| 96 | } |
| 97 | #else |
| 98 | void cmx270_pci_suspend(void) {} |
| 99 | void cmx270_pci_resume(void) {} |
| 100 | #endif |
| 101 | |
| 102 | /* PCI IRQ mapping*/ |
| 103 | static int __init cmx270_pci_map_irq(struct pci_dev *dev, u8 slot, u8 pin) |
| 104 | { |
| 105 | int irq; |
| 106 | |
| 107 | printk(KERN_DEBUG "===> %s: %s slot=%x, pin=%x\n", __FUNCTION__, |
| 108 | pci_name(dev), slot, pin); |
| 109 | |
| 110 | irq = it8152_pci_map_irq(dev, slot, pin); |
| 111 | if (irq) |
| 112 | return irq; |
| 113 | |
| 114 | /* |
| 115 | Here comes the ugly part. The routing is baseboard specific, |
| 116 | but defining a platform for each possible base of CM-x270 is |
| 117 | unrealistic. Here we keep mapping for ATXBase and SB-x270. |
| 118 | */ |
| 119 | /* ATXBASE PCI slot */ |
| 120 | if (slot == 7) |
| 121 | return IT8152_PCI_INTA; |
| 122 | |
| 123 | /* ATXBase/SB-x270 CardBus */ |
| 124 | if (slot == 8 || slot == 0) |
| 125 | return IT8152_PCI_INTB; |
| 126 | |
| 127 | /* ATXBase Ethernet */ |
| 128 | if (slot == 9) |
| 129 | return IT8152_PCI_INTA; |
| 130 | |
| 131 | /* SB-x270 Ethernet */ |
| 132 | if (slot == 16) |
| 133 | return IT8152_PCI_INTA; |
| 134 | |
| 135 | /* PC104+ interrupt routing */ |
| 136 | if ((slot == 17) || (slot == 19)) |
| 137 | return IT8152_PCI_INTA; |
| 138 | if ((slot == 18) || (slot == 20)) |
| 139 | return IT8152_PCI_INTB; |
| 140 | |
| 141 | return(0); |
| 142 | } |
| 143 | |
| 144 | static struct pci_bus * __init |
| 145 | cmx270_pci_scan_bus(int nr, struct pci_sys_data *sys) |
| 146 | { |
| 147 | printk(KERN_INFO "Initializing CM-X270 PCI subsystem\n"); |
| 148 | |
| 149 | __raw_writel(0x800, IT8152_PCI_CFG_ADDR); |
| 150 | if (__raw_readl(IT8152_PCI_CFG_DATA) == 0x81521283) { |
| 151 | printk(KERN_INFO "PCI Bridge found.\n"); |
| 152 | |
| 153 | /* set PCI I/O base at 0 */ |
| 154 | writel(0x848, IT8152_PCI_CFG_ADDR); |
| 155 | writel(0, IT8152_PCI_CFG_DATA); |
| 156 | |
| 157 | /* set PCI memory base at 0 */ |
| 158 | writel(0x840, IT8152_PCI_CFG_ADDR); |
| 159 | writel(0, IT8152_PCI_CFG_DATA); |
| 160 | |
| 161 | writel(0x20, IT8152_GPIO_GPDR); |
| 162 | |
| 163 | /* CardBus Controller on ATXbase baseboard */ |
| 164 | writel(0x4000, IT8152_PCI_CFG_ADDR); |
| 165 | if (readl(IT8152_PCI_CFG_DATA) == 0xAC51104C) { |
| 166 | printk(KERN_INFO "CardBus Bridge found.\n"); |
| 167 | |
| 168 | /* Configure socket 0 */ |
| 169 | writel(0x408C, IT8152_PCI_CFG_ADDR); |
| 170 | writel(0x1022, IT8152_PCI_CFG_DATA); |
| 171 | |
| 172 | writel(0x4080, IT8152_PCI_CFG_ADDR); |
| 173 | writel(0x3844d060, IT8152_PCI_CFG_DATA); |
| 174 | |
| 175 | writel(0x4090, IT8152_PCI_CFG_ADDR); |
| 176 | writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) | |
| 177 | 0x60440000), |
| 178 | IT8152_PCI_CFG_DATA); |
| 179 | |
| 180 | writel(0x4018, IT8152_PCI_CFG_ADDR); |
| 181 | writel(0xb0000000, IT8152_PCI_CFG_DATA); |
| 182 | |
| 183 | /* Configure socket 1 */ |
| 184 | writel(0x418C, IT8152_PCI_CFG_ADDR); |
| 185 | writel(0x1022, IT8152_PCI_CFG_DATA); |
| 186 | |
| 187 | writel(0x4180, IT8152_PCI_CFG_ADDR); |
| 188 | writel(0x3844d060, IT8152_PCI_CFG_DATA); |
| 189 | |
| 190 | writel(0x4190, IT8152_PCI_CFG_ADDR); |
| 191 | writel(((readl(IT8152_PCI_CFG_DATA) & 0xffff) | |
| 192 | 0x60440000), |
| 193 | IT8152_PCI_CFG_DATA); |
| 194 | |
| 195 | writel(0x4118, IT8152_PCI_CFG_ADDR); |
| 196 | writel(0xb0000000, IT8152_PCI_CFG_DATA); |
| 197 | } |
| 198 | } |
| 199 | return it8152_pci_scan_bus(nr, sys); |
| 200 | } |
| 201 | |
| 202 | static struct hw_pci cmx270_pci __initdata = { |
| 203 | .swizzle = pci_std_swizzle, |
| 204 | .map_irq = cmx270_pci_map_irq, |
| 205 | .nr_controllers = 1, |
| 206 | .setup = it8152_pci_setup, |
| 207 | .scan = cmx270_pci_scan_bus, |
| 208 | }; |
| 209 | |
| 210 | static int __init cmx270_init_pci(void) |
| 211 | { |
| 212 | if (machine_is_armcore()) |
| 213 | pci_common_init(&cmx270_pci); |
| 214 | |
| 215 | return 0; |
| 216 | } |
| 217 | |
| 218 | subsys_initcall(cmx270_init_pci); |