arch/arm/mach-ks8695/pci.c

   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 #include <linux/io.h>
  31
  32 #include <asm/signal.h>
  33 #include <asm/mach/pci.h>
  34 #include <mach/hardware.h>
  35
  36 #include <mach/devices.h>
  37 #include <mach/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* __init 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         /* make software reset to avoid freeze if PCI bus was messed up */
 249         __raw_writel(0x80000000, KS8695_PCI_VA + KS8695_PBCS);
 250
 251         /* stage 1 initialization, subid, subdevice = 0x0001 */
 252         __raw_writel(0x00010001, KS8695_PCI_VA + KS8695_CRCSID);
 253
 254         /* stage 2 initialization */
 255         /* prefetch limits with 16 words, retry enable */
 256         __raw_writel(0x40000000, KS8695_PCI_VA + KS8695_PBCS);
 257
 258         /* configure memory mapping */
 259         __raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBA);
 260         __raw_writel(size_mask(KS8695_PCIMEM_SIZE), KS8695_PCI_VA + KS8695_PMBAM);
 261         __raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBAT);
 262         __raw_writel(0, KS8695_PCI_VA + KS8695_PMBAC);
 263
 264         /* configure IO mapping */
 265         __raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBA);
 266         __raw_writel(size_mask(KS8695_PCIIO_SIZE), KS8695_PCI_VA + KS8695_PIOBAM);
 267         __raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBAT);
 268         __raw_writel(0, KS8695_PCI_VA + KS8695_PIOBAC);
 269
 270         /* hook in fault handlers */
 271         hook_fault_code(8, ks8695_pci_fault, SIGBUS, "external abort on non-linefetch");
 272         hook_fault_code(10, ks8695_pci_fault, SIGBUS, "external abort on non-linefetch");
 273 }
 274
 275 static void ks8695_show_pciregs(void)
 276 {
 277         if (!pci_dbg)
 278                 return;
 279
 280         printk(KERN_INFO "PCI: CRCFID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFID));
 281         printk(KERN_INFO "PCI: CRCFCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS));
 282         printk(KERN_INFO "PCI: CRCFRV = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFRV));
 283         printk(KERN_INFO "PCI: CRCFLT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFLT));
 284         printk(KERN_INFO "PCI: CRCBMA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCBMA));
 285         printk(KERN_INFO "PCI: CRCSID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCSID));
 286         printk(KERN_INFO "PCI: CRCFIT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFIT));
 287
 288         printk(KERN_INFO "PCI: PBM    = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBM));
 289         printk(KERN_INFO "PCI: PBCS   = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBCS));
 290
 291         printk(KERN_INFO "PCI: PMBA   = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBA));
 292         printk(KERN_INFO "PCI: PMBAC  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAC));
 293         printk(KERN_INFO "PCI: PMBAM  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAM));
 294         printk(KERN_INFO "PCI: PMBAT  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAT));
 295
 296         printk(KERN_INFO "PCI: PIOBA  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBA));
 297         printk(KERN_INFO "PCI: PIOBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAC));
 298         printk(KERN_INFO "PCI: PIOBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAM));
 299         printk(KERN_INFO "PCI: PIOBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAT));
 300 }
 301
 302
 303 static struct hw_pci ks8695_pci __initdata = {
 304         .nr_controllers = 1,
 305         .preinit        = ks8695_pci_preinit,
 306         .setup          = ks8695_pci_setup,
 307         .scan           = ks8695_pci_scan_bus,
 308         .postinit       = NULL,
 309         .swizzle        = pci_std_swizzle,
 310         .map_irq        = NULL,
 311 };
 312
 313 void __init ks8695_init_pci(struct ks8695_pci_cfg *cfg)
 314 {
 315         if (__raw_readl(KS8695_PCI_VA + KS8695_CRCFRV) & CFRV_GUEST) {
 316                 printk("PCI: KS8695 in guest mode, not initialising\n");
 317                 return;
 318         }
 319
 320         printk(KERN_INFO "PCI: Initialising\n");
 321         ks8695_show_pciregs();
 322
 323         /* set Mode */
 324         __raw_writel(cfg->mode << 29, KS8695_PCI_VA + KS8695_PBM);
 325
 326         ks8695_pci.map_irq = cfg->map_irq;      /* board-specific map_irq method */
 327
 328         pci_common_init(&ks8695_pci);
 329 }