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
  42 static void ks8695_pci_setupconfig(unsigned int bus_nr, unsigned int devfn, unsigned int where)
  43 {
  44         unsigned long pbca;
  45
  46         pbca = PBCA_ENABLE | (where & ~3);
  47         pbca |= PCI_SLOT(devfn) << 11 ;
  48         pbca |= PCI_FUNC(devfn) << 8;
  49         pbca |= bus_nr << 16;
  50
  51         if (bus_nr == 0) {
  52                 /* use Type-0 transaction */
  53                 __raw_writel(pbca, KS8695_PCI_VA + KS8695_PBCA);
  54         } else {
  55                 /* use Type-1 transaction */
  56                 __raw_writel(pbca | PBCA_TYPE1, KS8695_PCI_VA + KS8695_PBCA);
  57         }
  58 }
  59
  60 static void __iomem *ks8695_pci_map_bus(struct pci_bus *bus, unsigned int devfn,
  61                                         int where)
  62 {
  63         ks8695_pci_setupconfig(bus->number, devfn, where);
  64         return KS8695_PCI_VA +  KS8695_PBCD;
  65 }
  66
  67 static void ks8695_local_writeconfig(int where, u32 value)
  68 {
  69         ks8695_pci_setupconfig(0, 0, where);
  70         __raw_writel(value, KS8695_PCI_VA + KS8695_PBCD);
  71 }
  72
  73 static struct pci_ops ks8695_pci_ops = {
  74         .map_bus = ks8695_pci_map_bus,
  75         .read   = pci_generic_config_read32,
  76         .write  = pci_generic_config_write32,
  77 };
  78
  79 static struct resource pci_mem = {
  80         .name   = "PCI Memory space",
  81         .start  = KS8695_PCIMEM_PA,
  82         .end    = KS8695_PCIMEM_PA + (KS8695_PCIMEM_SIZE - 1),
  83         .flags  = IORESOURCE_MEM,
  84 };
  85
  86 static struct resource pci_io = {
  87         .name   = "PCI IO space",
  88         .start  = KS8695_PCIIO_PA,
  89         .end    = KS8695_PCIIO_PA + (KS8695_PCIIO_SIZE - 1),
  90         .flags  = IORESOURCE_IO,
  91 };
  92
  93 static int __init ks8695_pci_setup(int nr, struct pci_sys_data *sys)
  94 {
  95         if (nr > 0)
  96                 return 0;
  97
  98         request_resource(&iomem_resource, &pci_mem);
  99         request_resource(&ioport_resource, &pci_io);
 100
 101         pci_add_resource_offset(&sys->resources, &pci_io, sys->io_offset);
 102         pci_add_resource_offset(&sys->resources, &pci_mem, sys->mem_offset);
 103
 104         /* Assign and enable processor bridge */
 105         ks8695_local_writeconfig(PCI_BASE_ADDRESS_0, KS8695_PCIMEM_PA);
 106
 107         /* Enable bus-master & Memory Space access */
 108         ks8695_local_writeconfig(PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
 109
 110         /* Set cache-line size & latency. */
 111         ks8695_local_writeconfig(PCI_CACHE_LINE_SIZE, (32 << 8) | (L1_CACHE_BYTES / sizeof(u32)));
 112
 113         /* Reserve PCI memory space for PCI-AHB resources */
 114         if (!request_mem_region(KS8695_PCIMEM_PA, SZ_64M, "PCI-AHB Bridge")) {
 115                 printk(KERN_ERR "Cannot allocate PCI-AHB Bridge memory.\n");
 116                 return -EBUSY;
 117         }
 118
 119         return 1;
 120 }
 121
 122 static inline unsigned int size_mask(unsigned long size)
 123 {
 124         return (~size) + 1;
 125 }
 126
 127 static int ks8695_pci_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
 128 {
 129         unsigned long pc = instruction_pointer(regs);
 130         unsigned long instr = *(unsigned long *)pc;
 131         unsigned long cmdstat;
 132
 133         cmdstat = __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS);
 134
 135         printk(KERN_ERR "PCI abort: address = 0x%08lx fsr = 0x%03x PC = 0x%08lx LR = 0x%08lx [%s%s%s%s%s]\n",
 136                 addr, fsr, regs->ARM_pc, regs->ARM_lr,
 137                 cmdstat & (PCI_STATUS_SIG_TARGET_ABORT << 16) ? "GenTarget" : " ",
 138                 cmdstat & (PCI_STATUS_REC_TARGET_ABORT << 16) ? "RecvTarget" : " ",
 139                 cmdstat & (PCI_STATUS_REC_MASTER_ABORT << 16) ? "MasterAbort" : " ",
 140                 cmdstat & (PCI_STATUS_SIG_SYSTEM_ERROR << 16) ? "SysError" : " ",
 141                 cmdstat & (PCI_STATUS_DETECTED_PARITY << 16)  ? "Parity" : " "
 142         );
 143
 144         __raw_writel(cmdstat, KS8695_PCI_VA + KS8695_CRCFCS);
 145
 146         /*
 147          * If the instruction being executed was a read,
 148          * make it look like it read all-ones.
 149          */
 150         if ((instr & 0x0c100000) == 0x04100000) {
 151                 int reg = (instr >> 12) & 15;
 152                 unsigned long val;
 153
 154                 if (instr & 0x00400000)
 155                         val = 255;
 156                 else
 157                         val = -1;
 158
 159                 regs->uregs[reg] = val;
 160                 regs->ARM_pc += 4;
 161                 return 0;
 162         }
 163
 164         if ((instr & 0x0e100090) == 0x00100090) {
 165                 int reg = (instr >> 12) & 15;
 166
 167                 regs->uregs[reg] = -1;
 168                 regs->ARM_pc += 4;
 169                 return 0;
 170         }
 171
 172         return 1;
 173 }
 174
 175 static void __init ks8695_pci_preinit(void)
 176 {
 177         /* make software reset to avoid freeze if PCI bus was messed up */
 178         __raw_writel(0x80000000, KS8695_PCI_VA + KS8695_PBCS);
 179
 180         /* stage 1 initialization, subid, subdevice = 0x0001 */
 181         __raw_writel(0x00010001, KS8695_PCI_VA + KS8695_CRCSID);
 182
 183         /* stage 2 initialization */
 184         /* prefetch limits with 16 words, retry enable */
 185         __raw_writel(0x40000000, KS8695_PCI_VA + KS8695_PBCS);
 186
 187         /* configure memory mapping */
 188         __raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBA);
 189         __raw_writel(size_mask(KS8695_PCIMEM_SIZE), KS8695_PCI_VA + KS8695_PMBAM);
 190         __raw_writel(KS8695_PCIMEM_PA, KS8695_PCI_VA + KS8695_PMBAT);
 191         __raw_writel(0, KS8695_PCI_VA + KS8695_PMBAC);
 192
 193         /* configure IO mapping */
 194         __raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBA);
 195         __raw_writel(size_mask(KS8695_PCIIO_SIZE), KS8695_PCI_VA + KS8695_PIOBAM);
 196         __raw_writel(KS8695_PCIIO_PA, KS8695_PCI_VA + KS8695_PIOBAT);
 197         __raw_writel(0, KS8695_PCI_VA + KS8695_PIOBAC);
 198
 199         /* hook in fault handlers */
 200         hook_fault_code(8, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
 201         hook_fault_code(10, ks8695_pci_fault, SIGBUS, 0, "external abort on non-linefetch");
 202 }
 203
 204 static void ks8695_show_pciregs(void)
 205 {
 206         if (!pci_dbg)
 207                 return;
 208
 209         printk(KERN_INFO "PCI: CRCFID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFID));
 210         printk(KERN_INFO "PCI: CRCFCS = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFCS));
 211         printk(KERN_INFO "PCI: CRCFRV = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFRV));
 212         printk(KERN_INFO "PCI: CRCFLT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFLT));
 213         printk(KERN_INFO "PCI: CRCBMA = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCBMA));
 214         printk(KERN_INFO "PCI: CRCSID = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCSID));
 215         printk(KERN_INFO "PCI: CRCFIT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_CRCFIT));
 216
 217         printk(KERN_INFO "PCI: PBM    = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBM));
 218         printk(KERN_INFO "PCI: PBCS   = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PBCS));
 219
 220         printk(KERN_INFO "PCI: PMBA   = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBA));
 221         printk(KERN_INFO "PCI: PMBAC  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAC));
 222         printk(KERN_INFO "PCI: PMBAM  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAM));
 223         printk(KERN_INFO "PCI: PMBAT  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PMBAT));
 224
 225         printk(KERN_INFO "PCI: PIOBA  = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBA));
 226         printk(KERN_INFO "PCI: PIOBAC = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAC));
 227         printk(KERN_INFO "PCI: PIOBAM = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAM));
 228         printk(KERN_INFO "PCI: PIOBAT = %08x\n", __raw_readl(KS8695_PCI_VA + KS8695_PIOBAT));
 229 }
 230
 231
 232 static struct hw_pci ks8695_pci __initdata = {
 233         .nr_controllers = 1,
 234         .ops            = &ks8695_pci_ops,
 235         .preinit        = ks8695_pci_preinit,
 236         .setup          = ks8695_pci_setup,
 237         .postinit       = NULL,
 238         .map_irq        = NULL,
 239 };
 240
 241 void __init ks8695_init_pci(struct ks8695_pci_cfg *cfg)
 242 {
 243         if (__raw_readl(KS8695_PCI_VA + KS8695_CRCFRV) & CFRV_GUEST) {
 244                 printk("PCI: KS8695 in guest mode, not initialising\n");
 245                 return;
 246         }
 247
 248         pcibios_min_io = 0;
 249         pcibios_min_mem = 0;
 250
 251         printk(KERN_INFO "PCI: Initialising\n");
 252         ks8695_show_pciregs();
 253
 254         /* set Mode */
 255         __raw_writel(cfg->mode << 29, KS8695_PCI_VA + KS8695_PBM);
 256
 257         ks8695_pci.map_irq = cfg->map_irq;      /* board-specific map_irq method */
 258
 259         pci_common_init(&ks8695_pci);
 260 }