release/src-rt-6.x.4708/linux/linux-2.6.36/arch/mips/pci/pci-bcm63xx.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   7  */
   8
   9 #include <linux/types.h>
  10 #include <linux/pci.h>
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <asm/bootinfo.h>
  14
  15 #include "pci-bcm63xx.h"
  16
  17 /*
  18  * Allow PCI to be disabled at runtime depending on board nvram
  19  * configuration
  20  */
  21 int bcm63xx_pci_enabled;
  22
  23 static struct resource bcm_pci_mem_resource = {
  24         .name   = "bcm63xx PCI memory space",
  25         .start  = BCM_PCI_MEM_BASE_PA,
  26         .end    = BCM_PCI_MEM_END_PA,
  27         .flags  = IORESOURCE_MEM
  28 };
  29
  30 static struct resource bcm_pci_io_resource = {
  31         .name   = "bcm63xx PCI IO space",
  32         .start  = BCM_PCI_IO_BASE_PA,
  33 #ifdef CONFIG_CARDBUS
  34         .end    = BCM_PCI_IO_HALF_PA,
  35 #else
  36         .end    = BCM_PCI_IO_END_PA,
  37 #endif
  38         .flags  = IORESOURCE_IO
  39 };
  40
  41 struct pci_controller bcm63xx_controller = {
  42         .pci_ops        = &bcm63xx_pci_ops,
  43         .io_resource    = &bcm_pci_io_resource,
  44         .mem_resource   = &bcm_pci_mem_resource,
  45 };
  46
  47 /*
  48  * We handle cardbus  via a fake Cardbus bridge,  memory and io spaces
  49  * have to be  clearly separated from PCI one  since we have different
  50  * memory decoder.
  51  */
  52 #ifdef CONFIG_CARDBUS
  53 static struct resource bcm_cb_mem_resource = {
  54         .name   = "bcm63xx Cardbus memory space",
  55         .start  = BCM_CB_MEM_BASE_PA,
  56         .end    = BCM_CB_MEM_END_PA,
  57         .flags  = IORESOURCE_MEM
  58 };
  59
  60 static struct resource bcm_cb_io_resource = {
  61         .name   = "bcm63xx Cardbus IO space",
  62         .start  = BCM_PCI_IO_HALF_PA + 1,
  63         .end    = BCM_PCI_IO_END_PA,
  64         .flags  = IORESOURCE_IO
  65 };
  66
  67 struct pci_controller bcm63xx_cb_controller = {
  68         .pci_ops        = &bcm63xx_cb_ops,
  69         .io_resource    = &bcm_cb_io_resource,
  70         .mem_resource   = &bcm_cb_mem_resource,
  71 };
  72 #endif
  73
  74 static u32 bcm63xx_int_cfg_readl(u32 reg)
  75 {
  76         u32 tmp;
  77
  78         tmp = reg & MPI_PCICFGCTL_CFGADDR_MASK;
  79         tmp |= MPI_PCICFGCTL_WRITEEN_MASK;
  80         bcm_mpi_writel(tmp, MPI_PCICFGCTL_REG);
  81         iob();
  82         return bcm_mpi_readl(MPI_PCICFGDATA_REG);
  83 }
  84
  85 static void bcm63xx_int_cfg_writel(u32 val, u32 reg)
  86 {
  87         u32 tmp;
  88
  89         tmp = reg & MPI_PCICFGCTL_CFGADDR_MASK;
  90         tmp |=  MPI_PCICFGCTL_WRITEEN_MASK;
  91         bcm_mpi_writel(tmp, MPI_PCICFGCTL_REG);
  92         bcm_mpi_writel(val, MPI_PCICFGDATA_REG);
  93 }
  94
  95 void __iomem *pci_iospace_start;
  96
  97 static int __init bcm63xx_pci_init(void)
  98 {
  99         unsigned int mem_size;
 100         u32 val;
 101
 102         if (!BCMCPU_IS_6348() && !BCMCPU_IS_6358())
 103                 return -ENODEV;
 104
 105         if (!bcm63xx_pci_enabled)
 106                 return -ENODEV;
 107
 108         /*
 109          * configuration  access are  done through  IO space,  remap 4
 110          * first bytes to access it from CPU.
 111          *
 112          * this means that  no io access from CPU  should happen while
 113          * we do a configuration cycle,  but there's no way we can add
 114          * a spinlock for each io access, so this is currently kind of
 115          * broken on SMP.
 116          */
 117         pci_iospace_start = ioremap_nocache(BCM_PCI_IO_BASE_PA, 4);
 118         if (!pci_iospace_start)
 119                 return -ENOMEM;
 120
 121         /* setup local bus to PCI access (PCI memory) */
 122         val = BCM_PCI_MEM_BASE_PA & MPI_L2P_BASE_MASK;
 123         bcm_mpi_writel(val, MPI_L2PMEMBASE1_REG);
 124         bcm_mpi_writel(~(BCM_PCI_MEM_SIZE - 1), MPI_L2PMEMRANGE1_REG);
 125         bcm_mpi_writel(val | MPI_L2PREMAP_ENABLED_MASK, MPI_L2PMEMREMAP1_REG);
 126
 127         /* set Cardbus IDSEL (type 0 cfg access on primary bus for
 128          * this IDSEL will be done on Cardbus instead) */
 129         val = bcm_pcmcia_readl(PCMCIA_C1_REG);
 130         val &= ~PCMCIA_C1_CBIDSEL_MASK;
 131         val |= (CARDBUS_PCI_IDSEL << PCMCIA_C1_CBIDSEL_SHIFT);
 132         bcm_pcmcia_writel(val, PCMCIA_C1_REG);
 133
 134 #ifdef CONFIG_CARDBUS
 135         /* setup local bus to PCI access (Cardbus memory) */
 136         val = BCM_CB_MEM_BASE_PA & MPI_L2P_BASE_MASK;
 137         bcm_mpi_writel(val, MPI_L2PMEMBASE2_REG);
 138         bcm_mpi_writel(~(BCM_CB_MEM_SIZE - 1), MPI_L2PMEMRANGE2_REG);
 139         val |= MPI_L2PREMAP_ENABLED_MASK | MPI_L2PREMAP_IS_CARDBUS_MASK;
 140         bcm_mpi_writel(val, MPI_L2PMEMREMAP2_REG);
 141 #else
 142         /* disable second access windows */
 143         bcm_mpi_writel(0, MPI_L2PMEMREMAP2_REG);
 144 #endif
 145
 146         /* setup local bus  to PCI access (IO memory),  we have only 1
 147          * IO window  for both PCI  and cardbus, but it  cannot handle
 148          * both  at the  same time,  assume standard  PCI for  now, if
 149          * cardbus card has  IO zone, PCI fixup will  change window to
 150          * cardbus */
 151         val = BCM_PCI_IO_BASE_PA & MPI_L2P_BASE_MASK;
 152         bcm_mpi_writel(val, MPI_L2PIOBASE_REG);
 153         bcm_mpi_writel(~(BCM_PCI_IO_SIZE - 1), MPI_L2PIORANGE_REG);
 154         bcm_mpi_writel(val | MPI_L2PREMAP_ENABLED_MASK, MPI_L2PIOREMAP_REG);
 155
 156         /* enable PCI related GPIO pins */
 157         bcm_mpi_writel(MPI_LOCBUSCTL_EN_PCI_GPIO_MASK, MPI_LOCBUSCTL_REG);
 158
 159         /* setup PCI to local bus access, used by PCI device to target
 160          * local RAM while bus mastering */
 161         bcm63xx_int_cfg_writel(0, PCI_BASE_ADDRESS_3);
 162         if (BCMCPU_IS_6358())
 163                 val = MPI_SP0_REMAP_ENABLE_MASK;
 164         else
 165                 val = 0;
 166         bcm_mpi_writel(val, MPI_SP0_REMAP_REG);
 167
 168         bcm63xx_int_cfg_writel(0x0, PCI_BASE_ADDRESS_4);
 169         bcm_mpi_writel(0, MPI_SP1_REMAP_REG);
 170
 171         mem_size = bcm63xx_get_memory_size();
 172
 173         /* 6348 before rev b0 exposes only 16 MB of RAM memory through
 174          * PCI, throw a warning if we have more memory */
 175         if (BCMCPU_IS_6348() && (bcm63xx_get_cpu_rev() & 0xf0) == 0xa0) {
 176                 if (mem_size > (16 * 1024 * 1024))
 177                         printk(KERN_WARNING "bcm63xx: this CPU "
 178                                "revision cannot handle more than 16MB "
 179                                "of RAM for PCI bus mastering\n");
 180         } else {
 181                 /* setup sp0 range to local RAM size */
 182                 bcm_mpi_writel(~(mem_size - 1), MPI_SP0_RANGE_REG);
 183                 bcm_mpi_writel(0, MPI_SP1_RANGE_REG);
 184         }
 185
 186         /* change  host bridge  retry  counter to  infinite number  of
 187          * retry,  needed for  some broadcom  wifi cards  with Silicon
 188          * Backplane bus where access to srom seems very slow  */
 189         val = bcm63xx_int_cfg_readl(BCMPCI_REG_TIMERS);
 190         val &= ~REG_TIMER_RETRY_MASK;
 191         bcm63xx_int_cfg_writel(val, BCMPCI_REG_TIMERS);
 192
 193         /* enable memory decoder and bus mastering */
 194         val = bcm63xx_int_cfg_readl(PCI_COMMAND);
 195         val |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 196         bcm63xx_int_cfg_writel(val, PCI_COMMAND);
 197
 198         /* enable read prefetching & disable byte swapping for bus
 199          * mastering transfers */
 200         val = bcm_mpi_readl(MPI_PCIMODESEL_REG);
 201         val &= ~MPI_PCIMODESEL_BAR1_NOSWAP_MASK;
 202         val &= ~MPI_PCIMODESEL_BAR2_NOSWAP_MASK;
 203         val &= ~MPI_PCIMODESEL_PREFETCH_MASK;
 204         val |= (8 << MPI_PCIMODESEL_PREFETCH_SHIFT);
 205         bcm_mpi_writel(val, MPI_PCIMODESEL_REG);
 206
 207         /* enable pci interrupt */
 208         val = bcm_mpi_readl(MPI_LOCINT_REG);
 209         val |= MPI_LOCINT_MASK(MPI_LOCINT_EXT_PCI_INT);
 210         bcm_mpi_writel(val, MPI_LOCINT_REG);
 211
 212         register_pci_controller(&bcm63xx_controller);
 213
 214 #ifdef CONFIG_CARDBUS
 215         register_pci_controller(&bcm63xx_cb_controller);
 216 #endif
 217
 218         /* mark memory space used for IO mapping as reserved */
 219         request_mem_region(BCM_PCI_IO_BASE_PA, BCM_PCI_IO_SIZE,
 220                            "bcm63xx PCI IO space");
 221         return 0;
 222 }
 223
 224 arch_initcall(bcm63xx_pci_init);