1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * Copyright(c) 2010 Intel Corporation. All rights reserved. 4 * 5 * Contact Information: 6 * Intel Corporation 7 * 2200 Mission College Blvd. 8 * Santa Clara, CA 97052 9 * 10 * This provides access methods for PCI registers that mis-behave on 11 * the CE4100. Each register can be assigned a private init, read and 12 * write routine. The exception to this is the bridge device. The 13 * bridge device is the only device on bus zero (0) that requires any 14 * fixup so it is a special case ATM 15 */ 16 17#include <linux/kernel.h> 18#include <linux/pci.h> 19#include <linux/init.h> 20 21#include <asm/ce4100.h> 22#include <asm/pci_x86.h> 23 24struct sim_reg { 25 u32 value; 26 u32 mask; 27}; 28 29struct sim_dev_reg { 30 int dev_func; 31 int reg; 32 void (*init)(struct sim_dev_reg *reg); 33 void (*read)(struct sim_dev_reg *reg, u32 *value); 34 void (*write)(struct sim_dev_reg *reg, u32 value); 35 struct sim_reg sim_reg; 36}; 37 38struct sim_reg_op { 39 void (*init)(struct sim_dev_reg *reg); 40 void (*read)(struct sim_dev_reg *reg, u32 value); 41 void (*write)(struct sim_dev_reg *reg, u32 value); 42}; 43 44#define MB (1024 * 1024) 45#define KB (1024) 46#define SIZE_TO_MASK(size) (~(size - 1)) 47 48#define DEFINE_REG(device, func, offset, size, init_op, read_op, write_op)\ 49{ PCI_DEVFN(device, func), offset, init_op, read_op, write_op,\ 50 {0, SIZE_TO_MASK(size)} }, 51 52/* 53 * All read/write functions are called with pci_config_lock held. 54 */ 55static void reg_init(struct sim_dev_reg *reg) 56{ 57 pci_direct_conf1.read(0, 1, reg->dev_func, reg->reg, 4, 58 ®->sim_reg.value); 59} 60 61static void reg_read(struct sim_dev_reg *reg, u32 *value) 62{ 63 *value = reg->sim_reg.value; 64} 65 66static void reg_write(struct sim_dev_reg *reg, u32 value) 67{ 68 reg->sim_reg.value = (value & reg->sim_reg.mask) | 69 (reg->sim_reg.value & ~reg->sim_reg.mask); 70} 71 72static void sata_reg_init(struct sim_dev_reg *reg) 73{ 74 pci_direct_conf1.read(0, 1, PCI_DEVFN(14, 0), 0x10, 4, 75 ®->sim_reg.value); 76 reg->sim_reg.value += 0x400; 77} 78 79static void ehci_reg_read(struct sim_dev_reg *reg, u32 *value) 80{ 81 reg_read(reg, value); 82 if (*value != reg->sim_reg.mask) 83 *value |= 0x100; 84} 85 86static void sata_revid_init(struct sim_dev_reg *reg) 87{ 88 reg->sim_reg.value = 0x01060100; 89 reg->sim_reg.mask = 0; 90} 91 92static void sata_revid_read(struct sim_dev_reg *reg, u32 *value) 93{ 94 reg_read(reg, value); 95} 96 97static void reg_noirq_read(struct sim_dev_reg *reg, u32 *value) 98{ 99 /* force interrupt pin value to 0 */ 100 *value = reg->sim_reg.value & 0xfff00ff; 101} 102 103static struct sim_dev_reg bus1_fixups[] = { 104 DEFINE_REG(2, 0, 0x10, (16*MB), reg_init, reg_read, reg_write) 105 DEFINE_REG(2, 0, 0x14, (256), reg_init, reg_read, reg_write) 106 DEFINE_REG(2, 1, 0x10, (64*KB), reg_init, reg_read, reg_write) 107 DEFINE_REG(3, 0, 0x10, (64*KB), reg_init, reg_read, reg_write) 108 DEFINE_REG(4, 0, 0x10, (128*KB), reg_init, reg_read, reg_write) 109 DEFINE_REG(4, 1, 0x10, (128*KB), reg_init, reg_read, reg_write) 110 DEFINE_REG(6, 0, 0x10, (512*KB), reg_init, reg_read, reg_write) 111 DEFINE_REG(6, 1, 0x10, (512*KB), reg_init, reg_read, reg_write) 112 DEFINE_REG(6, 2, 0x10, (64*KB), reg_init, reg_read, reg_write) 113 DEFINE_REG(8, 0, 0x10, (1*MB), reg_init, reg_read, reg_write) 114 DEFINE_REG(8, 1, 0x10, (64*KB), reg_init, reg_read, reg_write) 115 DEFINE_REG(8, 2, 0x10, (64*KB), reg_init, reg_read, reg_write) 116 DEFINE_REG(9, 0, 0x10 , (1*MB), reg_init, reg_read, reg_write) 117 DEFINE_REG(9, 0, 0x14, (64*KB), reg_init, reg_read, reg_write) 118 DEFINE_REG(10, 0, 0x10, (256), reg_init, reg_read, reg_write) 119 DEFINE_REG(10, 0, 0x14, (256*MB), reg_init, reg_read, reg_write) 120 DEFINE_REG(11, 0, 0x10, (256), reg_init, reg_read, reg_write) 121 DEFINE_REG(11, 0, 0x14, (256), reg_init, reg_read, reg_write) 122 DEFINE_REG(11, 1, 0x10, (256), reg_init, reg_read, reg_write) 123 DEFINE_REG(11, 2, 0x10, (256), reg_init, reg_read, reg_write) 124 DEFINE_REG(11, 2, 0x14, (256), reg_init, reg_read, reg_write) 125 DEFINE_REG(11, 2, 0x18, (256), reg_init, reg_read, reg_write) 126 DEFINE_REG(11, 3, 0x10, (256), reg_init, reg_read, reg_write) 127 DEFINE_REG(11, 3, 0x14, (256), reg_init, reg_read, reg_write) 128 DEFINE_REG(11, 4, 0x10, (256), reg_init, reg_read, reg_write) 129 DEFINE_REG(11, 5, 0x10, (64*KB), reg_init, reg_read, reg_write) 130 DEFINE_REG(11, 6, 0x10, (256), reg_init, reg_read, reg_write) 131 DEFINE_REG(11, 7, 0x10, (64*KB), reg_init, reg_read, reg_write) 132 DEFINE_REG(11, 7, 0x3c, 256, reg_init, reg_noirq_read, reg_write) 133 DEFINE_REG(12, 0, 0x10, (128*KB), reg_init, reg_read, reg_write) 134 DEFINE_REG(12, 0, 0x14, (256), reg_init, reg_read, reg_write) 135 DEFINE_REG(12, 1, 0x10, (1024), reg_init, reg_read, reg_write) 136 DEFINE_REG(13, 0, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write) 137 DEFINE_REG(13, 1, 0x10, (32*KB), reg_init, ehci_reg_read, reg_write) 138 DEFINE_REG(14, 0, 0x8, 0, sata_revid_init, sata_revid_read, 0) 139 DEFINE_REG(14, 0, 0x10, 0, reg_init, reg_read, reg_write) 140 DEFINE_REG(14, 0, 0x14, 0, reg_init, reg_read, reg_write) 141 DEFINE_REG(14, 0, 0x18, 0, reg_init, reg_read, reg_write) 142 DEFINE_REG(14, 0, 0x1C, 0, reg_init, reg_read, reg_write) 143 DEFINE_REG(14, 0, 0x20, 0, reg_init, reg_read, reg_write) 144 DEFINE_REG(14, 0, 0x24, (0x200), sata_reg_init, reg_read, reg_write) 145 DEFINE_REG(15, 0, 0x10, (64*KB), reg_init, reg_read, reg_write) 146 DEFINE_REG(15, 0, 0x14, (64*KB), reg_init, reg_read, reg_write) 147 DEFINE_REG(16, 0, 0x10, (64*KB), reg_init, reg_read, reg_write) 148 DEFINE_REG(16, 0, 0x14, (64*MB), reg_init, reg_read, reg_write) 149 DEFINE_REG(16, 0, 0x18, (64*MB), reg_init, reg_read, reg_write) 150 DEFINE_REG(16, 0, 0x3c, 256, reg_init, reg_noirq_read, reg_write) 151 DEFINE_REG(17, 0, 0x10, (128*KB), reg_init, reg_read, reg_write) 152 DEFINE_REG(18, 0, 0x10, (1*KB), reg_init, reg_read, reg_write) 153 DEFINE_REG(18, 0, 0x3c, 256, reg_init, reg_noirq_read, reg_write) 154}; 155 156static void __init init_sim_regs(void) 157{ 158 int i; 159 160 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) { 161 if (bus1_fixups[i].init) 162 bus1_fixups[i].init(&bus1_fixups[i]); 163 } 164} 165 166static inline void extract_bytes(u32 *value, int reg, int len) 167{ 168 uint32_t mask; 169 170 *value >>= ((reg & 3) * 8); 171 mask = 0xFFFFFFFF >> ((4 - len) * 8); 172 *value &= mask; 173} 174 175static int bridge_read(unsigned int devfn, int reg, int len, u32 *value) 176{ 177 u32 av_bridge_base, av_bridge_limit; 178 int retval = 0; 179 180 switch (reg) { 181 /* Make BARs appear to not request any memory. */ 182 case PCI_BASE_ADDRESS_0: 183 case PCI_BASE_ADDRESS_0 + 1: 184 case PCI_BASE_ADDRESS_0 + 2: 185 case PCI_BASE_ADDRESS_0 + 3: 186 *value = 0; 187 break; 188 189 /* Since subordinate bus number register is hardwired 190 * to zero and read only, so do the simulation. 191 */ 192 case PCI_PRIMARY_BUS: 193 if (len == 4) 194 *value = 0x00010100; 195 break; 196 197 case PCI_SUBORDINATE_BUS: 198 *value = 1; 199 break; 200 201 case PCI_MEMORY_BASE: 202 case PCI_MEMORY_LIMIT: 203 /* Get the A/V bridge base address. */ 204 pci_direct_conf1.read(0, 0, devfn, 205 PCI_BASE_ADDRESS_0, 4, &av_bridge_base); 206 207 av_bridge_limit = av_bridge_base + (512*MB - 1); 208 av_bridge_limit >>= 16; 209 av_bridge_limit &= 0xFFF0; 210 211 av_bridge_base >>= 16; 212 av_bridge_base &= 0xFFF0; 213 214 if (reg == PCI_MEMORY_LIMIT) 215 *value = av_bridge_limit; 216 else if (len == 2) 217 *value = av_bridge_base; 218 else 219 *value = (av_bridge_limit << 16) | av_bridge_base; 220 break; 221 /* Make prefetchable memory limit smaller than prefetchable 222 * memory base, so not claim prefetchable memory space. 223 */ 224 case PCI_PREF_MEMORY_BASE: 225 *value = 0xFFF0; 226 break; 227 case PCI_PREF_MEMORY_LIMIT: 228 *value = 0x0; 229 break; 230 /* Make IO limit smaller than IO base, so not claim IO space. */ 231 case PCI_IO_BASE: 232 *value = 0xF0; 233 break; 234 case PCI_IO_LIMIT: 235 *value = 0; 236 break; 237 default: 238 retval = 1; 239 } 240 return retval; 241} 242 243static int ce4100_bus1_read(unsigned int devfn, int reg, int len, u32 *value) 244{ 245 unsigned long flags; 246 int i; 247 248 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) { 249 if (bus1_fixups[i].dev_func == devfn && 250 bus1_fixups[i].reg == (reg & ~3) && 251 bus1_fixups[i].read) { 252 253 raw_spin_lock_irqsave(&pci_config_lock, flags); 254 bus1_fixups[i].read(&(bus1_fixups[i]), value); 255 raw_spin_unlock_irqrestore(&pci_config_lock, flags); 256 extract_bytes(value, reg, len); 257 return 0; 258 } 259 } 260 return -1; 261} 262 263static int ce4100_conf_read(unsigned int seg, unsigned int bus, 264 unsigned int devfn, int reg, int len, u32 *value) 265{ 266 WARN_ON(seg); 267 268 if (bus == 1 && !ce4100_bus1_read(devfn, reg, len, value)) 269 return 0; 270 271 if (bus == 0 && (PCI_DEVFN(1, 0) == devfn) && 272 !bridge_read(devfn, reg, len, value)) 273 return 0; 274 275 return pci_direct_conf1.read(seg, bus, devfn, reg, len, value); 276} 277 278static int ce4100_bus1_write(unsigned int devfn, int reg, int len, u32 value) 279{ 280 unsigned long flags; 281 int i; 282 283 for (i = 0; i < ARRAY_SIZE(bus1_fixups); i++) { 284 if (bus1_fixups[i].dev_func == devfn && 285 bus1_fixups[i].reg == (reg & ~3) && 286 bus1_fixups[i].write) { 287 288 raw_spin_lock_irqsave(&pci_config_lock, flags); 289 bus1_fixups[i].write(&(bus1_fixups[i]), value); 290 raw_spin_unlock_irqrestore(&pci_config_lock, flags); 291 return 0; 292 } 293 } 294 return -1; 295} 296 297static int ce4100_conf_write(unsigned int seg, unsigned int bus, 298 unsigned int devfn, int reg, int len, u32 value) 299{ 300 WARN_ON(seg); 301 302 if (bus == 1 && !ce4100_bus1_write(devfn, reg, len, value)) 303 return 0; 304 305 /* Discard writes to A/V bridge BAR. */ 306 if (bus == 0 && PCI_DEVFN(1, 0) == devfn && 307 ((reg & ~3) == PCI_BASE_ADDRESS_0)) 308 return 0; 309 310 return pci_direct_conf1.write(seg, bus, devfn, reg, len, value); 311} 312 313static const struct pci_raw_ops ce4100_pci_conf = { 314 .read = ce4100_conf_read, 315 .write = ce4100_conf_write, 316}; 317 318int __init ce4100_pci_init(void) 319{ 320 init_sim_regs(); 321 raw_pci_ops = &ce4100_pci_conf; 322 /* Indicate caller that it should invoke pci_legacy_init() */ 323 return 1; 324} 325