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 <linux/delay.h>
  14 #include <linux/clk.h>
  15 #include <asm/bootinfo.h>
  16
  17 #include <bcm63xx_reset.h>
  18
  19 #include "pci-bcm63xx.h"
  20
  21 /*
  22  * Allow PCI to be disabled at runtime depending on board nvram
  23  * configuration
  24  */
  25 int bcm63xx_pci_enabled;
  26
  27 static struct resource bcm_pci_mem_resource = {
  28         .name   = "bcm63xx PCI memory space",
  29         .start  = BCM_PCI_MEM_BASE_PA,
  30         .end    = BCM_PCI_MEM_END_PA,
  31         .flags  = IORESOURCE_MEM
  32 };
  33
  34 static struct resource bcm_pci_io_resource = {
  35         .name   = "bcm63xx PCI IO space",
  36         .start  = BCM_PCI_IO_BASE_PA,
  37 #ifdef CONFIG_CARDBUS
  38         .end    = BCM_PCI_IO_HALF_PA,
  39 #else
  40         .end    = BCM_PCI_IO_END_PA,
  41 #endif
  42         .flags  = IORESOURCE_IO
  43 };
  44
  45 struct pci_controller bcm63xx_controller = {
  46         .pci_ops        = &bcm63xx_pci_ops,
  47         .io_resource    = &bcm_pci_io_resource,
  48         .mem_resource   = &bcm_pci_mem_resource,
  49 };
  50
  51 /*
  52  * We handle cardbus  via a fake Cardbus bridge,  memory and io spaces
  53  * have to be  clearly separated from PCI one  since we have different
  54  * memory decoder.
  55  */
  56 #ifdef CONFIG_CARDBUS
  57 static struct resource bcm_cb_mem_resource = {
  58         .name   = "bcm63xx Cardbus memory space",
  59         .start  = BCM_CB_MEM_BASE_PA,
  60         .end    = BCM_CB_MEM_END_PA,
  61         .flags  = IORESOURCE_MEM
  62 };
  63
  64 static struct resource bcm_cb_io_resource = {
  65         .name   = "bcm63xx Cardbus IO space",
  66         .start  = BCM_PCI_IO_HALF_PA + 1,
  67         .end    = BCM_PCI_IO_END_PA,
  68         .flags  = IORESOURCE_IO
  69 };
  70
  71 struct pci_controller bcm63xx_cb_controller = {
  72         .pci_ops        = &bcm63xx_cb_ops,
  73         .io_resource    = &bcm_cb_io_resource,
  74         .mem_resource   = &bcm_cb_mem_resource,
  75 };
  76 #endif
  77
  78 static struct resource bcm_pcie_mem_resource = {
  79         .name   = "bcm63xx PCIe memory space",
  80         .start  = BCM_PCIE_MEM_BASE_PA,
  81         .end    = BCM_PCIE_MEM_END_PA,
  82         .flags  = IORESOURCE_MEM,
  83 };
  84
  85 static struct resource bcm_pcie_io_resource = {
  86         .name   = "bcm63xx PCIe IO space",
  87         .start  = 0,
  88         .end    = 0,
  89         .flags  = 0,
  90 };
  91
  92 struct pci_controller bcm63xx_pcie_controller = {
  93         .pci_ops        = &bcm63xx_pcie_ops,
  94         .io_resource    = &bcm_pcie_io_resource,
  95         .mem_resource   = &bcm_pcie_mem_resource,
  96 };
  97
  98 static u32 bcm63xx_int_cfg_readl(u32 reg)
  99 {
 100         u32 tmp;
 101
 102         tmp = reg & MPI_PCICFGCTL_CFGADDR_MASK;
 103         tmp |= MPI_PCICFGCTL_WRITEEN_MASK;
 104         bcm_mpi_writel(tmp, MPI_PCICFGCTL_REG);
 105         iob();
 106         return bcm_mpi_readl(MPI_PCICFGDATA_REG);
 107 }
 108
 109 static void bcm63xx_int_cfg_writel(u32 val, u32 reg)
 110 {
 111         u32 tmp;
 112
 113         tmp = reg & MPI_PCICFGCTL_CFGADDR_MASK;
 114         tmp |=  MPI_PCICFGCTL_WRITEEN_MASK;
 115         bcm_mpi_writel(tmp, MPI_PCICFGCTL_REG);
 116         bcm_mpi_writel(val, MPI_PCICFGDATA_REG);
 117 }
 118
 119 void __iomem *pci_iospace_start;
 120
 121 static void __init bcm63xx_reset_pcie(void)
 122 {
 123         u32 val;
 124
 125         /* enable SERDES */
 126         val = bcm_misc_readl(MISC_SERDES_CTRL_REG);
 127         val |= SERDES_PCIE_EN | SERDES_PCIE_EXD_EN;
 128         bcm_misc_writel(val, MISC_SERDES_CTRL_REG);
 129
 130         /* reset the PCIe core */
 131         bcm63xx_core_set_reset(BCM63XX_RESET_PCIE, 1);
 132         bcm63xx_core_set_reset(BCM63XX_RESET_PCIE_EXT, 1);
 133         mdelay(10);
 134
 135         bcm63xx_core_set_reset(BCM63XX_RESET_PCIE, 0);
 136         mdelay(10);
 137
 138         bcm63xx_core_set_reset(BCM63XX_RESET_PCIE_EXT, 0);
 139         mdelay(200);
 140 }
 141
 142 static struct clk *pcie_clk;
 143
 144 static int __init bcm63xx_register_pcie(void)
 145 {
 146         u32 val;
 147
 148         /* enable clock */
 149         pcie_clk = clk_get(NULL, "pcie");
 150         if (IS_ERR_OR_NULL(pcie_clk))
 151                 return -ENODEV;
 152
 153         clk_prepare_enable(pcie_clk);
 154
 155         bcm63xx_reset_pcie();
 156
 157         /* configure the PCIe bridge */
 158         val = bcm_pcie_readl(PCIE_BRIDGE_OPT1_REG);
 159         val |= OPT1_RD_BE_OPT_EN;
 160         val |= OPT1_RD_REPLY_BE_FIX_EN;
 161         val |= OPT1_PCIE_BRIDGE_HOLE_DET_EN;
 162         val |= OPT1_L1_INT_STATUS_MASK_POL;
 163         bcm_pcie_writel(val, PCIE_BRIDGE_OPT1_REG);
 164
 165         /* setup the interrupts */
 166         val = bcm_pcie_readl(PCIE_BRIDGE_RC_INT_MASK_REG);
 167         val |= PCIE_RC_INT_A | PCIE_RC_INT_B | PCIE_RC_INT_C | PCIE_RC_INT_D;
 168         bcm_pcie_writel(val, PCIE_BRIDGE_RC_INT_MASK_REG);
 169
 170         val = bcm_pcie_readl(PCIE_BRIDGE_OPT2_REG);
 171         /* enable credit checking and error checking */
 172         val |= OPT2_TX_CREDIT_CHK_EN;
 173         val |= OPT2_UBUS_UR_DECODE_DIS;
 174
 175         /* set device bus/func for the pcie device */
 176         val |= (PCIE_BUS_DEVICE << OPT2_CFG_TYPE1_BUS_NO_SHIFT);
 177         val |= OPT2_CFG_TYPE1_BD_SEL;
 178         bcm_pcie_writel(val, PCIE_BRIDGE_OPT2_REG);
 179
 180         /* setup class code as bridge */
 181         val = bcm_pcie_readl(PCIE_IDVAL3_REG);
 182         val &= ~IDVAL3_CLASS_CODE_MASK;
 183         val |= (PCI_CLASS_BRIDGE_PCI << IDVAL3_SUBCLASS_SHIFT);
 184         bcm_pcie_writel(val, PCIE_IDVAL3_REG);
 185
 186         /* disable bar1 size */
 187         val = bcm_pcie_readl(PCIE_CONFIG2_REG);
 188         val &= ~CONFIG2_BAR1_SIZE_MASK;
 189         bcm_pcie_writel(val, PCIE_CONFIG2_REG);
 190
 191         /* set bar0 to little endian */
 192         val = (BCM_PCIE_MEM_BASE_PA >> 20) << BASEMASK_BASE_SHIFT;
 193         val |= (BCM_PCIE_MEM_BASE_PA >> 20) << BASEMASK_MASK_SHIFT;
 194         val |= BASEMASK_REMAP_EN;
 195         bcm_pcie_writel(val, PCIE_BRIDGE_BAR0_BASEMASK_REG);
 196
 197         val = (BCM_PCIE_MEM_BASE_PA >> 20) << REBASE_ADDR_BASE_SHIFT;
 198         bcm_pcie_writel(val, PCIE_BRIDGE_BAR0_REBASE_ADDR_REG);
 199
 200         register_pci_controller(&bcm63xx_pcie_controller);
 201
 202         return 0;
 203 }
 204
 205 static int __init bcm63xx_register_pci(void)
 206 {
 207         unsigned int mem_size;
 208         u32 val;
 209         /*
 210          * configuration  access are  done through  IO space,  remap 4
 211          * first bytes to access it from CPU.
 212          *
 213          * this means that  no io access from CPU  should happen while
 214          * we do a configuration cycle,  but there's no way we can add
 215          * a spinlock for each io access, so this is currently kind of
 216          * broken on SMP.
 217          */
 218         pci_iospace_start = ioremap_nocache(BCM_PCI_IO_BASE_PA, 4);
 219         if (!pci_iospace_start)
 220                 return -ENOMEM;
 221
 222         /* setup local bus to PCI access (PCI memory) */
 223         val = BCM_PCI_MEM_BASE_PA & MPI_L2P_BASE_MASK;
 224         bcm_mpi_writel(val, MPI_L2PMEMBASE1_REG);
 225         bcm_mpi_writel(~(BCM_PCI_MEM_SIZE - 1), MPI_L2PMEMRANGE1_REG);
 226         bcm_mpi_writel(val | MPI_L2PREMAP_ENABLED_MASK, MPI_L2PMEMREMAP1_REG);
 227
 228         /* set Cardbus IDSEL (type 0 cfg access on primary bus for
 229          * this IDSEL will be done on Cardbus instead) */
 230         val = bcm_pcmcia_readl(PCMCIA_C1_REG);
 231         val &= ~PCMCIA_C1_CBIDSEL_MASK;
 232         val |= (CARDBUS_PCI_IDSEL << PCMCIA_C1_CBIDSEL_SHIFT);
 233         bcm_pcmcia_writel(val, PCMCIA_C1_REG);
 234
 235 #ifdef CONFIG_CARDBUS
 236         /* setup local bus to PCI access (Cardbus memory) */
 237         val = BCM_CB_MEM_BASE_PA & MPI_L2P_BASE_MASK;
 238         bcm_mpi_writel(val, MPI_L2PMEMBASE2_REG);
 239         bcm_mpi_writel(~(BCM_CB_MEM_SIZE - 1), MPI_L2PMEMRANGE2_REG);
 240         val |= MPI_L2PREMAP_ENABLED_MASK | MPI_L2PREMAP_IS_CARDBUS_MASK;
 241         bcm_mpi_writel(val, MPI_L2PMEMREMAP2_REG);
 242 #else
 243         /* disable second access windows */
 244         bcm_mpi_writel(0, MPI_L2PMEMREMAP2_REG);
 245 #endif
 246
 247         /* setup local bus  to PCI access (IO memory),  we have only 1
 248          * IO window  for both PCI  and cardbus, but it  cannot handle
 249          * both  at the  same time,  assume standard  PCI for  now, if
 250          * cardbus card has  IO zone, PCI fixup will  change window to
 251          * cardbus */
 252         val = BCM_PCI_IO_BASE_PA & MPI_L2P_BASE_MASK;
 253         bcm_mpi_writel(val, MPI_L2PIOBASE_REG);
 254         bcm_mpi_writel(~(BCM_PCI_IO_SIZE - 1), MPI_L2PIORANGE_REG);
 255         bcm_mpi_writel(val | MPI_L2PREMAP_ENABLED_MASK, MPI_L2PIOREMAP_REG);
 256
 257         /* enable PCI related GPIO pins */
 258         bcm_mpi_writel(MPI_LOCBUSCTL_EN_PCI_GPIO_MASK, MPI_LOCBUSCTL_REG);
 259
 260         /* setup PCI to local bus access, used by PCI device to target
 261          * local RAM while bus mastering */
 262         bcm63xx_int_cfg_writel(0, PCI_BASE_ADDRESS_3);
 263         if (BCMCPU_IS_6358() || BCMCPU_IS_6368())
 264                 val = MPI_SP0_REMAP_ENABLE_MASK;
 265         else
 266                 val = 0;
 267         bcm_mpi_writel(val, MPI_SP0_REMAP_REG);
 268
 269         bcm63xx_int_cfg_writel(0x0, PCI_BASE_ADDRESS_4);
 270         bcm_mpi_writel(0, MPI_SP1_REMAP_REG);
 271
 272         mem_size = bcm63xx_get_memory_size();
 273
 274         /* 6348 before rev b0 exposes only 16 MB of RAM memory through
 275          * PCI, throw a warning if we have more memory */
 276         if (BCMCPU_IS_6348() && (bcm63xx_get_cpu_rev() & 0xf0) == 0xa0) {
 277                 if (mem_size > (16 * 1024 * 1024))
 278                         printk(KERN_WARNING "bcm63xx: this CPU "
 279                                "revision cannot handle more than 16MB "
 280                                "of RAM for PCI bus mastering\n");
 281         } else {
 282                 /* setup sp0 range to local RAM size */
 283                 bcm_mpi_writel(~(mem_size - 1), MPI_SP0_RANGE_REG);
 284                 bcm_mpi_writel(0, MPI_SP1_RANGE_REG);
 285         }
 286
 287         /* change  host bridge  retry  counter to  infinite number  of
 288          * retry,  needed for  some broadcom  wifi cards  with Silicon
 289          * Backplane bus where access to srom seems very slow  */
 290         val = bcm63xx_int_cfg_readl(BCMPCI_REG_TIMERS);
 291         val &= ~REG_TIMER_RETRY_MASK;
 292         bcm63xx_int_cfg_writel(val, BCMPCI_REG_TIMERS);
 293
 294         /* enable memory decoder and bus mastering */
 295         val = bcm63xx_int_cfg_readl(PCI_COMMAND);
 296         val |= (PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER);
 297         bcm63xx_int_cfg_writel(val, PCI_COMMAND);
 298
 299         /* enable read prefetching & disable byte swapping for bus
 300          * mastering transfers */
 301         val = bcm_mpi_readl(MPI_PCIMODESEL_REG);
 302         val &= ~MPI_PCIMODESEL_BAR1_NOSWAP_MASK;
 303         val &= ~MPI_PCIMODESEL_BAR2_NOSWAP_MASK;
 304         val &= ~MPI_PCIMODESEL_PREFETCH_MASK;
 305         val |= (8 << MPI_PCIMODESEL_PREFETCH_SHIFT);
 306         bcm_mpi_writel(val, MPI_PCIMODESEL_REG);
 307
 308         /* enable pci interrupt */
 309         val = bcm_mpi_readl(MPI_LOCINT_REG);
 310         val |= MPI_LOCINT_MASK(MPI_LOCINT_EXT_PCI_INT);
 311         bcm_mpi_writel(val, MPI_LOCINT_REG);
 312
 313         register_pci_controller(&bcm63xx_controller);
 314
 315 #ifdef CONFIG_CARDBUS
 316         register_pci_controller(&bcm63xx_cb_controller);
 317 #endif
 318
 319         /* mark memory space used for IO mapping as reserved */
 320         request_mem_region(BCM_PCI_IO_BASE_PA, BCM_PCI_IO_SIZE,
 321                            "bcm63xx PCI IO space");
 322         return 0;
 323 }
 324
 325
 326 static int __init bcm63xx_pci_init(void)
 327 {
 328         if (!bcm63xx_pci_enabled)
 329                 return -ENODEV;
 330
 331         switch (bcm63xx_get_cpu_id()) {
 332         case BCM6328_CPU_ID:
 333                 return bcm63xx_register_pcie();
 334         case BCM6348_CPU_ID:
 335         case BCM6358_CPU_ID:
 336         case BCM6368_CPU_ID:
 337                 return bcm63xx_register_pci();
 338         default:
 339                 return -ENODEV;
 340         }
 341 }
 342
 343 arch_initcall(bcm63xx_pci_init);