1 /* 2 * MPC85xx/86xx PCI/PCIE support routing. 3 * 4 * Copyright 2007 Freescale Semiconductor, Inc 5 * 6 * Initial author: Xianghua Xiao <x.xiao@freescale.com> 7 * Recode: ZHANG WEI <wei.zhang@freescale.com> 8 * Rewrite the routing for Frescale PCI and PCI Express 9 * Roy Zang <tie-fei.zang@freescale.com> 10 * 11 * This program is free software; you can redistribute it and/or modify it 12 * under the terms of the GNU General Public License as published by the 13 * Free Software Foundation; either version 2 of the License, or (at your 14 * option) any later version. 15 */ 16 #include <linux/kernel.h> 17 #include <linux/pci.h> 18 #include <linux/delay.h> 19 #include <linux/string.h> 20 #include <linux/init.h> 21 #include <linux/bootmem.h> 22 23 #include <asm/io.h> 24 #include <asm/prom.h> 25 #include <asm/pci-bridge.h> 26 #include <asm/machdep.h> 27 #include <sysdev/fsl_soc.h> 28 #include <sysdev/fsl_pci.h> 29 30 /* atmu setup for fsl pci/pcie controller */ 31 void __init setup_pci_atmu(struct pci_controller *hose, struct resource *rsrc) 32 { 33 struct ccsr_pci __iomem *pci; 34 int i; 35 36 pr_debug("PCI memory map start 0x%016llx, size 0x%016llx\n", 37 (u64)rsrc->start, (u64)rsrc->end - (u64)rsrc->start + 1); 38 pci = ioremap(rsrc->start, rsrc->end - rsrc->start + 1); 39 40 /* Disable all windows (except powar0 since its ignored) */ 41 for(i = 1; i < 5; i++) 42 out_be32(&pci->pow[i].powar, 0); 43 for(i = 0; i < 3; i++) 44 out_be32(&pci->piw[i].piwar, 0); 45 46 /* Setup outbound MEM window */ 47 for(i = 0; i < 3; i++) 48 if (hose->mem_resources[i].flags & IORESOURCE_MEM){ 49 resource_size_t pci_addr_start = 50 hose->mem_resources[i].start - 51 hose->pci_mem_offset; 52 pr_debug("PCI MEM resource start 0x%016llx, size 0x%016llx.\n", 53 (u64)hose->mem_resources[i].start, 54 (u64)hose->mem_resources[i].end 55 - (u64)hose->mem_resources[i].start + 1); 56 out_be32(&pci->pow[i+1].potar, (pci_addr_start >> 12)); 57 out_be32(&pci->pow[i+1].potear, 0); 58 out_be32(&pci->pow[i+1].powbar, 59 (hose->mem_resources[i].start >> 12)); 60 /* Enable, Mem R/W */ 61 out_be32(&pci->pow[i+1].powar, 0x80044000 62 | (__ilog2(hose->mem_resources[i].end 63 - hose->mem_resources[i].start + 1) - 1)); 64 } 65 66 /* Setup outbound IO window */ 67 if (hose->io_resource.flags & IORESOURCE_IO){ 68 pr_debug("PCI IO resource start 0x%016llx, size 0x%016llx, " 69 "phy base 0x%016llx.\n", 70 (u64)hose->io_resource.start, 71 (u64)hose->io_resource.end - (u64)hose->io_resource.start + 1, 72 (u64)hose->io_base_phys); 73 out_be32(&pci->pow[i+1].potar, (hose->io_resource.start >> 12)); 74 out_be32(&pci->pow[i+1].potear, 0); 75 out_be32(&pci->pow[i+1].powbar, (hose->io_base_phys >> 12)); 76 /* Enable, IO R/W */ 77 out_be32(&pci->pow[i+1].powar, 0x80088000 78 | (__ilog2(hose->io_resource.end 79 - hose->io_resource.start + 1) - 1)); 80 } 81 82 /* Setup 2G inbound Memory Window @ 1 */ 83 out_be32(&pci->piw[2].pitar, 0x00000000); 84 out_be32(&pci->piw[2].piwbar,0x00000000); 85 out_be32(&pci->piw[2].piwar, PIWAR_2G); 86 } 87 88 void __init setup_pci_cmd(struct pci_controller *hose) 89 { 90 u16 cmd; 91 int cap_x; 92 93 early_read_config_word(hose, 0, 0, PCI_COMMAND, &cmd); 94 cmd |= PCI_COMMAND_SERR | PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY 95 | PCI_COMMAND_IO; 96 early_write_config_word(hose, 0, 0, PCI_COMMAND, cmd); 97 98 cap_x = early_find_capability(hose, 0, 0, PCI_CAP_ID_PCIX); 99 if (cap_x) { 100 int pci_x_cmd = cap_x + PCI_X_CMD; 101 cmd = PCI_X_CMD_MAX_SPLIT | PCI_X_CMD_MAX_READ 102 | PCI_X_CMD_ERO | PCI_X_CMD_DPERR_E; 103 early_write_config_word(hose, 0, 0, pci_x_cmd, cmd); 104 } else { 105 early_write_config_byte(hose, 0, 0, PCI_LATENCY_TIMER, 0x80); 106 } 107 } 108 109 static int fsl_pcie_bus_fixup; 110 111 static void __init quirk_fsl_pcie_header(struct pci_dev *dev) 112 { 113 /* if we aren't a PCIe don't bother */ 114 if (!pci_find_capability(dev, PCI_CAP_ID_EXP)) 115 return ; 116 117 dev->class = PCI_CLASS_BRIDGE_PCI << 8; 118 fsl_pcie_bus_fixup = 1; 119 return ; 120 } 121 122 int __init fsl_pcie_check_link(struct pci_controller *hose) 123 { 124 u32 val; 125 early_read_config_dword(hose, 0, 0, PCIE_LTSSM, &val); 126 if (val < PCIE_LTSSM_L0) 127 return 1; 128 return 0; 129 } 130 131 void fsl_pcibios_fixup_bus(struct pci_bus *bus) 132 { 133 struct pci_controller *hose = (struct pci_controller *) bus->sysdata; 134 int i; 135 136 if ((bus->parent == hose->bus) && 137 ((fsl_pcie_bus_fixup && 138 early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) || 139 (hose->indirect_type & PPC_INDIRECT_TYPE_NO_PCIE_LINK))) 140 { 141 for (i = 0; i < 4; ++i) { 142 struct resource *res = bus->resource[i]; 143 struct resource *par = bus->parent->resource[i]; 144 if (res) { 145 res->start = 0; 146 res->end = 0; 147 res->flags = 0; 148 } 149 if (res && par) { 150 res->start = par->start; 151 res->end = par->end; 152 res->flags = par->flags; 153 } 154 } 155 } 156 } 157 158 int __init fsl_add_bridge(struct device_node *dev, int is_primary) 159 { 160 int len; 161 struct pci_controller *hose; 162 struct resource rsrc; 163 const int *bus_range; 164 165 pr_debug("Adding PCI host bridge %s\n", dev->full_name); 166 167 /* Fetch host bridge registers address */ 168 if (of_address_to_resource(dev, 0, &rsrc)) { 169 printk(KERN_WARNING "Can't get pci register base!"); 170 return -ENOMEM; 171 } 172 173 /* Get bus range if any */ 174 bus_range = of_get_property(dev, "bus-range", &len); 175 if (bus_range == NULL || len < 2 * sizeof(int)) 176 printk(KERN_WARNING "Can't get bus-range for %s, assume" 177 " bus 0\n", dev->full_name); 178 179 ppc_pci_flags |= PPC_PCI_REASSIGN_ALL_BUS; 180 hose = pcibios_alloc_controller(dev); 181 if (!hose) 182 return -ENOMEM; 183 184 hose->first_busno = bus_range ? bus_range[0] : 0x0; 185 hose->last_busno = bus_range ? bus_range[1] : 0xff; 186 187 setup_indirect_pci(hose, rsrc.start, rsrc.start + 0x4, 188 PPC_INDIRECT_TYPE_BIG_ENDIAN); 189 setup_pci_cmd(hose); 190 191 /* check PCI express link status */ 192 if (early_find_capability(hose, 0, 0, PCI_CAP_ID_EXP)) { 193 hose->indirect_type |= PPC_INDIRECT_TYPE_EXT_REG | 194 PPC_INDIRECT_TYPE_SURPRESS_PRIMARY_BUS; 195 if (fsl_pcie_check_link(hose)) 196 hose->indirect_type |= PPC_INDIRECT_TYPE_NO_PCIE_LINK; 197 } 198 199 printk(KERN_INFO "Found FSL PCI host bridge at 0x%016llx. " 200 "Firmware bus number: %d->%d\n", 201 (unsigned long long)rsrc.start, hose->first_busno, 202 hose->last_busno); 203 204 pr_debug(" ->Hose at 0x%p, cfg_addr=0x%p,cfg_data=0x%p\n", 205 hose, hose->cfg_addr, hose->cfg_data); 206 207 /* Interpret the "ranges" property */ 208 /* This also maps the I/O region and sets isa_io/mem_base */ 209 pci_process_bridge_OF_ranges(hose, dev, is_primary); 210 211 /* Setup PEX window registers */ 212 setup_pci_atmu(hose, &rsrc); 213 214 return 0; 215 } 216 217 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8548E, quirk_fsl_pcie_header); 218 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8548, quirk_fsl_pcie_header); 219 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8543E, quirk_fsl_pcie_header); 220 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8543, quirk_fsl_pcie_header); 221 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8547E, quirk_fsl_pcie_header); 222 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8545E, quirk_fsl_pcie_header); 223 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8545, quirk_fsl_pcie_header); 224 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8568E, quirk_fsl_pcie_header); 225 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8568, quirk_fsl_pcie_header); 226 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8567E, quirk_fsl_pcie_header); 227 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8567, quirk_fsl_pcie_header); 228 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8533E, quirk_fsl_pcie_header); 229 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8533, quirk_fsl_pcie_header); 230 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8544E, quirk_fsl_pcie_header); 231 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8544, quirk_fsl_pcie_header); 232 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8572E, quirk_fsl_pcie_header); 233 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8572, quirk_fsl_pcie_header); 234 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8641, quirk_fsl_pcie_header); 235 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8641D, quirk_fsl_pcie_header); 236 DECLARE_PCI_FIXUP_HEADER(0x1957, PCI_DEVICE_ID_MPC8610, quirk_fsl_pcie_header); 237