Andrew Victor | 7d77ce8 | 2007-10-15 13:09:19 +0100 | [diff] [blame] | 1 | /* |
| 2 | * arch/arm/mach-ks8695/pci.c |
| 3 | * |
| 4 | * Copyright (C) 2003, Micrel Semiconductors |
| 5 | * Copyright (C) 2006, Greg Ungerer <gerg@snapgear.com> |
| 6 | * Copyright (C) 2006, Ben Dooks |
| 7 | * Copyright (C) 2007, Andrew Victor |
| 8 | * |
| 9 | * This program is free software; you can redistribute it and/or modify |
| 10 | * it under the terms of the GNU General Public License as published by |
| 11 | * the Free Software Foundation; either version 2 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | * GNU General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 22 | */ |
| 23 | |
| 24 | #include <linux/kernel.h> |
| 25 | #include <linux/pci.h> |
| 26 | #include <linux/mm.h> |
| 27 | #include <linux/init.h> |
| 28 | #include <linux/irq.h> |
| 29 | #include <linux/delay.h> |
| 30 | |
| 31 | #include <asm/io.h> |
| 32 | #include <asm/signal.h> |
| 33 | #include <asm/mach/pci.h> |
| 34 | #include <asm/hardware.h> |
| 35 | |
| 36 | #include <asm/arch/devices.h> |
| 37 | #include <asm/arch/regs-pci.h> |
| 38 | |
| 39 | |
| 40 | static int pci_dbg; |
| 41 | static int pci_cfg_dbg; |
| 42 | |
| 43 | |
| 44 | static void ks8695_pci_setupconfig(unsigned int bus_nr, unsigned int devfn, unsigned int where) |
| 45 | { |
| 46 | unsigned long pbca; |
| 47 | |
| 48 | pbca = PBCA_ENABLE | (where & ~3); |
| 49 | pbca |= PCI_SLOT(devfn) << 11 ; |
| 50 | pbca |= PCI_FUNC(devfn) << 8; |
| 51 | pbca |= bus_nr << 16; |
| 52 | |
| 53 | if (bus_nr == 0) { |
| 54 | /* use Type-0 transaction */ |
| 55 | __raw_writel(pbca, KS8695_PCI_VA + KS8695_PBCA); |
| 56 | } else { |
| 57 | /* use Type-1 transaction */ |
| 58 | __raw_writel(pbca | PBCA_TYPE1, KS8695_PCI_VA + KS8695_PBCA); |
| 59 | } |
| 60 | } |
| 61 | |
| 62 | |
| 63 | /* |
| 64 | * The KS8695 datasheet prohibits anything other than 32bit accesses |
| 65 | * to the IO registers, so all our configuration must be done with |
| 66 | * 32bit operations, and the correct bit masking and shifting. |
| 67 | */ |
| 68 | |
| 69 | static int ks8695_pci_readconfig(struct pci_bus *bus, |
| 70 | unsigned int devfn, int where, int size, u32 *value) |
| 71 | { |
| 72 | ks8695_pci_setupconfig(bus->number, devfn, where); |
| 73 | |
| 74 | *value = __raw_readl(KS8695_PCI_VA + KS8695_PBCD); |
| 75 | |
| 76 | switch (size) { |
| 77 | case 4: |
| 78 | break; |
| 79 | case 2: |
| 80 | *value = *value >> ((where & 2) * 8); |
| 81 | *value &= 0xffff; |
| 82 | break; |
| 83 | case 1: |
| 84 | *value = *value >> ((where & 3) * 8); |
| 85 | *value &= 0xff; |
| 86 | break; |
| 87 | } |
| 88 | |
| 89 | if (pci_cfg_dbg) { |
| 90 | printk("read: %d,%08x,%02x,%d: %08x (%08x)\n", |
| 91 | bus->number, devfn, where, size, *value, |
| 92 | __raw_readl(KS8695_PCI_VA + KS8695_PBCD)); |
| 93 | } |
| 94 | |
| 95 | return PCIBIOS_SUCCESSFUL; |
| 96 | } |
| 97 | |
| 98 | static int ks8695_pci_writeconfig(struct pci_bus *bus, |
| 99 | unsigned int devfn, int where, int size, u32 value) |
| 100 | { |
| 101 | unsigned long tmp; |
| 102 | |
| 103 | if (pci_cfg_dbg) { |
| 104 | printk("write: %d,%08x,%02x,%d: %08x\n", |
| 105 | bus->number, devfn, where, size, value); |
| 106 | } |
| 107 | |
| 108 | ks8695_pci_setupconfig(bus->number, devfn, where); |
| 109 | |
| 110 | switch (size) { |
| 111 | case 4: |
| 112 | __raw_writel(value, KS8695_PCI_VA + KS8695_PBCD); |
| 113 | break; |
| 114 | case 2: |
| 115 | tmp = __raw_readl(KS8695_PCI_VA + KS8695_PBCD); |
| 116 | tmp &= ~(0xffff << ((where & 2) * 8)); |
| 117 | tmp |= value << ((where & 2) * 8); |
| 118 | |
| 119 | __raw_writel(tmp, KS8695_PCI_VA + KS8695_PBCD); |
| 120 | break; |
| 121 | case 1: |
| 122 | tmp = __raw_readl(KS8695_PCI_VA + KS8695_PBCD); |
| 123 | tmp &= ~(0xff << ((where & 3) * 8)); |
| 124 | tmp |= value << ((where & 3) * 8); |
| 125 | |
| 126 | __raw_writel(tmp, KS8695_PCI_VA + KS8695_PBCD); |
| 127 | break; |
| 128 | } |
| 129 | |
| 130 | return PCIBIOS_SUCCESSFUL; |
| 131 | } |
| 132 | |
| 133 | static void ks8695_local_writeconfig(int where, u32 value) |
| 134 | { |
| 135 | ks8695_pci_setupconfig(0, 0, where); |
| 136 | __raw_writel(value, KS8695_PCI_VA + KS8695_PBCD); |
| 137 | } |
| 138 | |
| 139 | static struct pci_ops ks8695_pci_ops = { |
| 140 | .read = ks8695_pci_readconfig, |
| 141 | .write = ks8695_pci_writeconfig, |
| 142 | }; |
| 143 | |
| 144 | static struct pci_bus *ks8695_pci_scan_bus(int nr, struct pci_sys_data *sys) |
| 145 | { |
| 146 | return pci_scan_bus(sys->busnr, &ks8695_pci_ops, sys); |
| 147 | } |
| 148 | |
| 149 | static struct resource pci_mem = { |
| 150 | .name = "PCI Memory space", |
| 151 | .start = KS8695_PCIMEM_PA, |
| 152 | .end = KS8695_PCIMEM_PA + (KS8695_PCIMEM_SIZE - 1), |
| 153 | .flags = IORESOURCE_MEM, |
| 154 | }; |
| 155 | |
| 156 | static struct resource pci_io = { |
| 157 | .name = "PCI IO space", |
| 158 | .start = KS8695_PCIIO_PA, |
| 159 | .end = KS8695_PCIIO_PA + (KS8695_PCIIO_SIZE - 1), |
| 160 | .flags = IORESOURCE_IO, |
| 161 | }; |
| 162 | |
| 163 | static int __init ks8695_pci_setup(int nr, struct pci_sys_data *sys) |
| 164 | { |
| 165 | if (nr > 0) |
| 166 | return 0; |
| 167 | |
| 168 | request_resource(&iomem_resource, &pci_mem); |
| 169 | request_resource(&ioport_resource, &pci_io); |
| 170 | |
| 171 | sys->resource[0] = &pci_io; |
| 172 | sys->resource[1] = &pci_mem; |
| 173 | sys->resource[2] = NULL; |
| 174 | |
| 175 | /* Assign and enable processor bridge */ |
| 176 | ks8695_local_writeconfig(PCI_BASE_ADDRESS_0, KS8695_PCIMEM_PA); |
| 177 | |
| 178 | /* Enable bus-master & Memory Space access */ |
| 179 | ks8695_local_writeconfig(PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY); |
| 180 | |
| 181 | /* Set cache-line size & latency. */ |
| 182 | ks8695_local_writeconfig(PCI_CACHE_LINE_SIZE, (32 << 8) | (L1_CACHE_BYTES / sizeof(u32))); |
| 183 | |
| 184 | /* Reserve PCI memory space for PCI-AHB resources */ |
| 185 | if (!request_mem_region(KS8695_PCIMEM_PA, SZ_64M, "PCI-AHB Bridge")) { |
| 186 | printk(KERN_ERR "Cannot allocate PCI-AHB Bridge memory.\n"); |
| 187 | return -EBUSY; |
| 188 | } |
| 189 | |
| 190 | return 1; |
| 191 | } |
| 192 | |
| 193 | static inline unsigned int size_mask(unsigned long size) |
| 194 | { |
| 195 | return (~size) + 1; |
| 196 | } |
| 197 | |
| 198 | static int ks8695_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) |
| 199 | { |
| 200 | unsigned long pc = instruction_pointer(regs); |
| 201 | unsigned long instr = *(unsigned long *)pc; |
| 202 | unsigned long cmdstat; |
| 203 | |
| 204 | cmdstat = __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS); |
| 205 | |
| 206 | printk(KERN_ERR "PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx [%s%s%s%s%s]\n", |
| 207 | addr, fsr, regs->ARM_pc, regs->ARM_lr, |
| 208 | cmdstat & (PCI_STATUS_SIG_TARGET_ABORT << 16) ? "GenTarget" : " ", |
| 209 | cmdstat & (PCI_STATUS_REC_TARGET_ABORT << 16) ? "RecvTarget" : " ", |
| 210 | cmdstat & (PCI_STATUS_REC_MASTER_ABORT << 16) ? "MasterAbort" : " ", |
| 211 | cmdstat & (PCI_STATUS_SIG_SYSTEM_ERROR << 16) ? "SysError" : " ", |
| 212 | cmdstat & (PCI_STATUS_DETECTED_PARITY << 16) ? "Parity" : " " |
| 213 | ); |
| 214 | |
| 215 | __raw_writel(cmdstat, KS8695_PCI_VA + KS8695_CRCFCS); |
| 216 | |
| 217 | /* |
| 218 | * If the instruction being executed was a read, |
| 219 | * make it look like it read all-ones. |
| 220 | */ |
| 221 | if ((instr & 0x0c100000) == 0x04100000) { |
| 222 | int reg = (instr >> 12) & 15; |
| 223 | unsigned long val; |
| 224 | |
| 225 | if (instr & 0x00400000) |
| 226 | val = 255; |
| 227 | else |
| 228 | val = -1; |
| 229 | |
| 230 | regs->uregs[reg] = val; |
| 231 | regs->ARM_pc += 4; |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | if ((instr & 0x0e100090) == 0x00100090) { |
| 236 | int reg = (instr >> 12) & 15; |
| 237 | |
| 238 | regs->uregs[reg] = -1; |
| 239 | regs->ARM_pc += 4; |
| 240 | return 0; |
| 241 | } |
| 242 | |
| 243 | return 1; |
| 244 | } |
| 245 | |
| 246 | static void __init ks8695_pci_preinit(void) |
| 247 | { |
| 248 | /* stage 1 initialization, subid, subdevice = 0x0001 */ |
| 249 | __raw_writel(0x00010001, KS8695_PCI_VA + KS8695_CRCSID); |
| 250 | |
| 251 | /* stage 2 initialization */ |
| 252 | /* prefetch limits with 16 words, retry enable */ |
| 253 | __raw_writel(0x40000000, KS8695_PCI_VA + KS8695_PBCS); |
| 254 | |
| 255 | /* configure memory mapping */ |
| 256 | __raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBA); |
| 257 | __raw_writel(size_mask(KS8695_PCIMEM_SIZE), KS8695_PCI_VA + KS8695_PMBAM); |
| 258 | __raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBAT); |
| 259 | __raw_writel(0, KS8695_PCI_VA + KS8695_PMBAC); |
| 260 | |
| 261 | /* configure IO mapping */ |
| 262 | __raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBA); |
| 263 | __raw_writel(size_mask(KS8695_PCIIO_SIZE), KS8695_PCI_VA + KS8695_PIOBAM); |
| 264 | __raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBAT); |
| 265 | __raw_writel(0, KS8695_PCI_VA + KS8695_PIOBAC); |
| 266 | |
| 267 | /* hook in fault handlers */ |
| 268 | hook_fault_code(8, ks8695_pci_fault, SIGBUS, "external abort on non-linefetch"); |
| 269 | hook_fault_code(10, ks8695_pci_fault, SIGBUS, "external abort on non-linefetch"); |
| 270 | } |
| 271 | |
| 272 | static void ks8695_show_pciregs(void) |
| 273 | { |
| 274 | if (!pci_dbg) |
| 275 | return; |
| 276 | |
| 277 | printk(KERN_INFO "PCI: CRCFID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFID)); |
| 278 | printk(KERN_INFO "PCI: CRCFCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS)); |
| 279 | printk(KERN_INFO "PCI: CRCFRV = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFRV)); |
| 280 | printk(KERN_INFO "PCI: CRCFLT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFLT)); |
| 281 | printk(KERN_INFO "PCI: CRCBMA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCBMA)); |
| 282 | printk(KERN_INFO "PCI: CRCSID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCSID)); |
| 283 | printk(KERN_INFO "PCI: CRCFIT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFIT)); |
| 284 | |
| 285 | printk(KERN_INFO "PCI: PBM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBM)); |
| 286 | printk(KERN_INFO "PCI: PBCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBCS)); |
| 287 | |
| 288 | printk(KERN_INFO "PCI: PMBA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBA)); |
| 289 | printk(KERN_INFO "PCI: PMBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAC)); |
| 290 | printk(KERN_INFO "PCI: PMBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAM)); |
| 291 | printk(KERN_INFO "PCI: PMBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAT)); |
| 292 | |
| 293 | printk(KERN_INFO "PCI: PIOBA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBA)); |
| 294 | printk(KERN_INFO "PCI: PIOBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAC)); |
| 295 | printk(KERN_INFO "PCI: PIOBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAM)); |
| 296 | printk(KERN_INFO "PCI: PIOBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAT)); |
| 297 | } |
| 298 | |
| 299 | |
| 300 | static struct hw_pci ks8695_pci __initdata = { |
| 301 | .nr_controllers = 1, |
| 302 | .preinit = ks8695_pci_preinit, |
| 303 | .setup = ks8695_pci_setup, |
| 304 | .scan = ks8695_pci_scan_bus, |
| 305 | .postinit = NULL, |
| 306 | .swizzle = pci_std_swizzle, |
| 307 | .map_irq = NULL, |
| 308 | }; |
| 309 | |
| 310 | void __init ks8695_init_pci(struct ks8695_pci_cfg *cfg) |
| 311 | { |
| 312 | if (__raw_readl(KS8695_PCI_VA + KS8695_CRCFRV) & CFRV_GUEST) { |
| 313 | printk("PCI: KS8695 in guest mode, not initialising\n"); |
| 314 | return; |
| 315 | } |
| 316 | |
| 317 | printk(KERN_INFO "PCI: Initialising\n"); |
| 318 | ks8695_show_pciregs(); |
| 319 | |
| 320 | /* set Mode */ |
| 321 | __raw_writel(cfg->mode << 29, KS8695_PCI_VA + KS8695_PBM); |
| 322 | |
| 323 | ks8695_pci.map_irq = cfg->map_irq; /* board-specific map_irq method */ |
| 324 | |
| 325 | pci_common_init(&ks8695_pci); |
| 326 | } |