Lennert Buytenhek | c471307 | 2006-03-28 21:18:54 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * arch/arm/mach-ixp23xx/pci.c |
| 3 | * |
| 4 | * PCI routines for IXP23XX based systems |
| 5 | * |
| 6 | * Copyright (c) 2005 MontaVista Software, Inc. |
| 7 | * |
| 8 | * based on original code: |
| 9 | * |
| 10 | * Author: Naeem Afzal <naeem.m.afzal@intel.com> |
| 11 | * Copyright 2002-2005 Intel Corp. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify it |
| 14 | * under the terms of the GNU General Public License as published by the |
| 15 | * Free Software Foundation; either version 2 of the License, or (at your |
| 16 | * option) any later version. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/config.h> |
| 20 | #include <linux/sched.h> |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/pci.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/mm.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/ioport.h> |
| 27 | #include <linux/slab.h> |
| 28 | #include <linux/delay.h> |
| 29 | |
| 30 | #include <asm/io.h> |
| 31 | #include <asm/irq.h> |
| 32 | #include <asm/sizes.h> |
| 33 | #include <asm/system.h> |
| 34 | #include <asm/mach/pci.h> |
| 35 | #include <asm/mach-types.h> |
| 36 | #include <asm/hardware.h> |
| 37 | |
| 38 | extern int (*external_fault) (unsigned long, struct pt_regs *); |
| 39 | |
| 40 | static int pci_master_aborts = 0; |
| 41 | |
| 42 | #ifdef DEBUG |
| 43 | #define DBG(x...) printk(x) |
| 44 | #else |
| 45 | #define DBG(x...) |
| 46 | #endif |
| 47 | |
| 48 | int clear_master_aborts(void); |
| 49 | |
| 50 | static u32 |
| 51 | *ixp23xx_pci_config_addr(unsigned int bus_nr, unsigned int devfn, int where) |
| 52 | { |
| 53 | u32 *paddress; |
| 54 | |
| 55 | /* |
| 56 | * Must be dword aligned |
| 57 | */ |
| 58 | where &= ~3; |
| 59 | |
| 60 | /* |
| 61 | * For top bus, generate type 0, else type 1 |
| 62 | */ |
| 63 | if (!bus_nr) { |
| 64 | if (PCI_SLOT(devfn) >= 8) |
| 65 | return 0; |
| 66 | |
| 67 | paddress = (u32 *) (IXP23XX_PCI_CFG0_VIRT |
| 68 | | (1 << (PCI_SLOT(devfn) + 16)) |
| 69 | | (PCI_FUNC(devfn) << 8) | where); |
| 70 | } else { |
| 71 | paddress = (u32 *) (IXP23XX_PCI_CFG1_VIRT |
| 72 | | (bus_nr << 16) |
| 73 | | (PCI_SLOT(devfn) << 11) |
| 74 | | (PCI_FUNC(devfn) << 8) | where); |
| 75 | } |
| 76 | |
| 77 | return paddress; |
| 78 | } |
| 79 | |
| 80 | /* |
| 81 | * Mask table, bits to mask for quantity of size 1, 2 or 4 bytes. |
| 82 | * 0 and 3 are not valid indexes... |
| 83 | */ |
| 84 | static u32 bytemask[] = { |
| 85 | /*0*/ 0, |
| 86 | /*1*/ 0xff, |
| 87 | /*2*/ 0xffff, |
| 88 | /*3*/ 0, |
| 89 | /*4*/ 0xffffffff, |
| 90 | }; |
| 91 | |
| 92 | static int ixp23xx_pci_read_config(struct pci_bus *bus, unsigned int devfn, |
| 93 | int where, int size, u32 *value) |
| 94 | { |
| 95 | u32 n; |
| 96 | u32 *addr; |
| 97 | |
| 98 | n = where % 4; |
| 99 | |
| 100 | DBG("In config_read(%d) %d from dev %d:%d:%d\n", size, where, |
| 101 | bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn)); |
| 102 | |
| 103 | addr = ixp23xx_pci_config_addr(bus->number, devfn, where); |
| 104 | if (!addr) |
| 105 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 106 | |
| 107 | pci_master_aborts = 0; |
| 108 | *value = (*addr >> (8*n)) & bytemask[size]; |
| 109 | if (pci_master_aborts) { |
| 110 | pci_master_aborts = 0; |
| 111 | *value = 0xffffffff; |
| 112 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 113 | } |
| 114 | |
| 115 | return PCIBIOS_SUCCESSFUL; |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * We don't do error checking on the address for writes. |
| 120 | * It's assumed that the user checked for the device existing first |
| 121 | * by doing a read first. |
| 122 | */ |
| 123 | static int ixp23xx_pci_write_config(struct pci_bus *bus, unsigned int devfn, |
| 124 | int where, int size, u32 value) |
| 125 | { |
| 126 | u32 mask; |
| 127 | u32 *addr; |
| 128 | u32 temp; |
| 129 | |
| 130 | mask = ~(bytemask[size] << ((where % 0x4) * 8)); |
| 131 | addr = ixp23xx_pci_config_addr(bus->number, devfn, where); |
| 132 | if (!addr) |
| 133 | return PCIBIOS_DEVICE_NOT_FOUND; |
| 134 | temp = (u32) (value) << ((where % 0x4) * 8); |
| 135 | *addr = (*addr & mask) | temp; |
| 136 | |
| 137 | clear_master_aborts(); |
| 138 | |
| 139 | return PCIBIOS_SUCCESSFUL; |
| 140 | } |
| 141 | |
| 142 | struct pci_ops ixp23xx_pci_ops = { |
| 143 | .read = ixp23xx_pci_read_config, |
| 144 | .write = ixp23xx_pci_write_config, |
| 145 | }; |
| 146 | |
| 147 | struct pci_bus *ixp23xx_pci_scan_bus(int nr, struct pci_sys_data *sysdata) |
| 148 | { |
| 149 | return pci_scan_bus(sysdata->busnr, &ixp23xx_pci_ops, sysdata); |
| 150 | } |
| 151 | |
| 152 | int ixp23xx_pci_abort_handler(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
| 153 | { |
| 154 | volatile unsigned long temp; |
| 155 | unsigned long flags; |
| 156 | |
| 157 | pci_master_aborts = 1; |
| 158 | |
| 159 | local_irq_save(flags); |
| 160 | temp = *IXP23XX_PCI_CONTROL; |
| 161 | |
| 162 | /* |
| 163 | * master abort and cmd tgt err |
| 164 | */ |
| 165 | if (temp & ((1 << 8) | (1 << 5))) |
| 166 | *IXP23XX_PCI_CONTROL = temp; |
| 167 | |
| 168 | temp = *IXP23XX_PCI_CMDSTAT; |
| 169 | |
| 170 | if (temp & (1 << 29)) |
| 171 | *IXP23XX_PCI_CMDSTAT = temp; |
| 172 | local_irq_restore(flags); |
| 173 | |
| 174 | /* |
| 175 | * If it was an imprecise abort, then we need to correct the |
| 176 | * return address to be _after_ the instruction. |
| 177 | */ |
| 178 | if (fsr & (1 << 10)) |
| 179 | regs->ARM_pc += 4; |
| 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | int clear_master_aborts(void) |
| 185 | { |
| 186 | volatile u32 temp; |
| 187 | |
| 188 | temp = *IXP23XX_PCI_CONTROL; |
| 189 | |
| 190 | /* |
| 191 | * master abort and cmd tgt err |
| 192 | */ |
| 193 | if (temp & ((1 << 8) | (1 << 5))) |
| 194 | *IXP23XX_PCI_CONTROL = temp; |
| 195 | |
| 196 | temp = *IXP23XX_PCI_CMDSTAT; |
| 197 | |
| 198 | if (temp & (1 << 29)) |
| 199 | *IXP23XX_PCI_CMDSTAT = temp; |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | void __init ixp23xx_pci_preinit(void) |
| 205 | { |
| 206 | #ifdef __ARMEB__ |
| 207 | *IXP23XX_PCI_CONTROL |= 0x20000; /* set I/O swapping */ |
| 208 | #endif |
| 209 | /* |
| 210 | * ADDR_31 needs to be clear for PCI memory access to CPP memory |
| 211 | */ |
| 212 | *IXP23XX_CPP2XSI_CURR_XFER_REG3 &= ~IXP23XX_CPP2XSI_ADDR_31; |
| 213 | *IXP23XX_CPP2XSI_CURR_XFER_REG3 |= IXP23XX_CPP2XSI_PSH_OFF; |
| 214 | |
| 215 | /* |
| 216 | * Select correct memory for PCI inbound transactions |
| 217 | */ |
| 218 | if (ixp23xx_cpp_boot()) { |
| 219 | *IXP23XX_PCI_CPP_ADDR_BITS &= ~(1 << 1); |
| 220 | } else { |
| 221 | *IXP23XX_PCI_CPP_ADDR_BITS |= (1 << 1); |
| 222 | } |
| 223 | |
| 224 | hook_fault_code(16+6, ixp23xx_pci_abort_handler, SIGBUS, |
| 225 | "PCI config cycle to non-existent device"); |
| 226 | |
| 227 | *IXP23XX_PCI_ADDR_EXT = 0x0000e000; |
| 228 | } |
| 229 | |
| 230 | /* |
| 231 | * Prevent PCI layer from seeing the inbound host-bridge resources |
| 232 | */ |
| 233 | static void __devinit pci_fixup_ixp23xx(struct pci_dev *dev) |
| 234 | { |
| 235 | int i; |
| 236 | |
| 237 | dev->class &= 0xff; |
| 238 | dev->class |= PCI_CLASS_BRIDGE_HOST << 8; |
| 239 | for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
| 240 | dev->resource[i].start = 0; |
| 241 | dev->resource[i].end = 0; |
| 242 | dev->resource[i].flags = 0; |
| 243 | } |
| 244 | } |
| 245 | DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, 0x9002, pci_fixup_ixp23xx); |
| 246 | |
| 247 | /* |
| 248 | * IXP2300 systems often have large resource requirements, so we just |
| 249 | * use our own resource space. |
| 250 | */ |
| 251 | static struct resource ixp23xx_pci_mem_space = { |
| 252 | .start = IXP23XX_PCI_MEM_START, |
| 253 | .end = IXP23XX_PCI_MEM_START + IXP23XX_PCI_MEM_SIZE - 1, |
| 254 | .flags = IORESOURCE_MEM, |
| 255 | .name = "PCI Mem Space" |
| 256 | }; |
| 257 | |
| 258 | static struct resource ixp23xx_pci_io_space = { |
| 259 | .start = 0x00000100, |
| 260 | .end = 0x01ffffff, |
| 261 | .flags = IORESOURCE_IO, |
| 262 | .name = "PCI I/O Space" |
| 263 | }; |
| 264 | |
| 265 | int ixp23xx_pci_setup(int nr, struct pci_sys_data *sys) |
| 266 | { |
| 267 | if (nr >= 1) |
| 268 | return 0; |
| 269 | |
| 270 | sys->resource[0] = &ixp23xx_pci_io_space; |
| 271 | sys->resource[1] = &ixp23xx_pci_mem_space; |
| 272 | sys->resource[2] = NULL; |
| 273 | |
| 274 | return 1; |
| 275 | } |