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pci.c

/*
 * CHRP pci routines.
 */

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>

#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/irq.h>
#include <asm/hydra.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/sections.h>
#include <asm/pci-bridge.h>
#include <asm/grackle.h>
#include <asm/rtas.h>

#include "chrp.h"
#include "gg2.h"

/* LongTrail */
void __iomem *gg2_pci_config_base;

/*
 * The VLSI Golden Gate II has only 512K of PCI configuration space, so we
 * limit the bus number to 3 bits
 */

int gg2_read_config(struct pci_bus *bus, unsigned int devfn, int off,
                     int len, u32 *val)
{
      volatile void __iomem *cfg_data;
      struct pci_controller *hose = bus->sysdata;

      if (bus->number > 7)
            return PCIBIOS_DEVICE_NOT_FOUND;
      /*
       * Note: the caller has already checked that off is
       * suitably aligned and that len is 1, 2 or 4.
       */
      cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
      switch (len) {
      case 1:
            *val =  in_8(cfg_data);
            break;
      case 2:
            *val = in_le16(cfg_data);
            break;
      default:
            *val = in_le32(cfg_data);
            break;
      }
      return PCIBIOS_SUCCESSFUL;
}

int gg2_write_config(struct pci_bus *bus, unsigned int devfn, int off,
                      int len, u32 val)
{
      volatile void __iomem *cfg_data;
      struct pci_controller *hose = bus->sysdata;

      if (bus->number > 7)
            return PCIBIOS_DEVICE_NOT_FOUND;
      /*
       * Note: the caller has already checked that off is
       * suitably aligned and that len is 1, 2 or 4.
       */
      cfg_data = hose->cfg_data + ((bus->number<<16) | (devfn<<8) | off);
      switch (len) {
      case 1:
            out_8(cfg_data, val);
            break;
      case 2:
            out_le16(cfg_data, val);
            break;
      default:
            out_le32(cfg_data, val);
            break;
      }
      return PCIBIOS_SUCCESSFUL;
}

static struct pci_ops gg2_pci_ops =
{
      .read = gg2_read_config,
      .write = gg2_write_config,
};

/*
 * Access functions for PCI config space using RTAS calls.
 */
int rtas_read_config(struct pci_bus *bus, unsigned int devfn, int offset,
                 int len, u32 *val)
{
      struct pci_controller *hose = bus->sysdata;
      unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
            | (((bus->number - hose->first_busno) & 0xff) << 16)
            | (hose->global_number << 24);
        int ret = -1;
      int rval;

      rval = rtas_call(rtas_token("read-pci-config"), 2, 2, &ret, addr, len);
      *val = ret;
      return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
}

int rtas_write_config(struct pci_bus *bus, unsigned int devfn, int offset,
                  int len, u32 val)
{
      struct pci_controller *hose = bus->sysdata;
      unsigned long addr = (offset & 0xff) | ((devfn & 0xff) << 8)
            | (((bus->number - hose->first_busno) & 0xff) << 16)
            | (hose->global_number << 24);
      int rval;

      rval = rtas_call(rtas_token("write-pci-config"), 3, 1, NULL,
                   addr, len, val);
      return rval? PCIBIOS_DEVICE_NOT_FOUND: PCIBIOS_SUCCESSFUL;
}

static struct pci_ops rtas_pci_ops =
{
      .read = rtas_read_config,
      .write = rtas_write_config,
};

volatile struct Hydra __iomem *Hydra = NULL;

int __init
hydra_init(void)
{
      struct device_node *np;
      struct resource r;

      np = of_find_node_by_name(NULL, "mac-io");
      if (np == NULL || of_address_to_resource(np, 0, &r)) {
            of_node_put(np);
            return 0;
      }
      Hydra = ioremap(r.start, r.end-r.start);
      printk("Hydra Mac I/O at %llx\n", (unsigned long long)r.start);
      printk("Hydra Feature_Control was %x",
             in_le32(&Hydra->Feature_Control));
      out_le32(&Hydra->Feature_Control, (HYDRA_FC_SCC_CELL_EN |
                                 HYDRA_FC_SCSI_CELL_EN |
                                 HYDRA_FC_SCCA_ENABLE |
                                 HYDRA_FC_SCCB_ENABLE |
                                 HYDRA_FC_ARB_BYPASS |
                                 HYDRA_FC_MPIC_ENABLE |
                                 HYDRA_FC_SLOW_SCC_PCLK |
                                 HYDRA_FC_MPIC_IS_MASTER));
      printk(", now %x\n", in_le32(&Hydra->Feature_Control));
      return 1;
}

#define PRG_CL_RESET_VALID 0x00010000

static void __init
setup_python(struct pci_controller *hose, struct device_node *dev)
{
      u32 __iomem *reg;
      u32 val;
      struct resource r;

      if (of_address_to_resource(dev, 0, &r)) {
            printk(KERN_ERR "No address for Python PCI controller\n");
            return;
      }

      /* Clear the magic go-slow bit */
      reg = ioremap(r.start + 0xf6000, 0x40);
      BUG_ON(!reg); 
      val = in_be32(&reg[12]);
      if (val & PRG_CL_RESET_VALID) {
            out_be32(&reg[12], val & ~PRG_CL_RESET_VALID);
            in_be32(&reg[12]);
      }
      iounmap(reg);

      setup_indirect_pci(hose, r.start + 0xf8000, r.start + 0xf8010, 0);
}

/* Marvell Discovery II based Pegasos 2 */
static void __init setup_peg2(struct pci_controller *hose, struct device_node *dev)
{
      struct device_node *root = of_find_node_by_path("/");
      struct device_node *rtas;

      rtas = of_find_node_by_name (root, "rtas");
      if (rtas) {
            hose->ops = &rtas_pci_ops;
            of_node_put(rtas);
      } else {
            printk ("RTAS supporting Pegasos OF not found, please upgrade"
                  " your firmware\n");
      }
      ppc_pci_flags |= PPC_PCI_REASSIGN_ALL_BUS;
      /* keep the reference to the root node */
}

void __init
chrp_find_bridges(void)
{
      struct device_node *dev;
      const int *bus_range;
      int len, index = -1;
      struct pci_controller *hose;
      const unsigned int *dma;
      const char *model, *machine;
      int is_longtrail = 0, is_mot = 0, is_pegasos = 0;
      struct device_node *root = of_find_node_by_path("/");
      struct resource r;
      /*
       * The PCI host bridge nodes on some machines don't have
       * properties to adequately identify them, so we have to
       * look at what sort of machine this is as well.
       */
      machine = of_get_property(root, "model", NULL);
      if (machine != NULL) {
            is_longtrail = strncmp(machine, "IBM,LongTrail", 13) == 0;
            is_mot = strncmp(machine, "MOT", 3) == 0;
            if (strncmp(machine, "Pegasos2", 8) == 0)
                  is_pegasos = 2;
            else if (strncmp(machine, "Pegasos", 7) == 0)
                  is_pegasos = 1;
      }
      for (dev = root->child; dev != NULL; dev = dev->sibling) {
            if (dev->type == NULL || strcmp(dev->type, "pci") != 0)
                  continue;
            ++index;
            /* The GG2 bridge on the LongTrail doesn't have an address */
            if (of_address_to_resource(dev, 0, &r) && !is_longtrail) {
                  printk(KERN_WARNING "Can't use %s: no address\n",
                         dev->full_name);
                  continue;
            }
            bus_range = of_get_property(dev, "bus-range", &len);
            if (bus_range == NULL || len < 2 * sizeof(int)) {
                  printk(KERN_WARNING "Can't get bus-range for %s\n",
                        dev->full_name);
                  continue;
            }
            if (bus_range[1] == bus_range[0])
                  printk(KERN_INFO "PCI bus %d", bus_range[0]);
            else
                  printk(KERN_INFO "PCI buses %d..%d",
                         bus_range[0], bus_range[1]);
            printk(" controlled by %s", dev->full_name);
            if (!is_longtrail)
                  printk(" at %llx", (unsigned long long)r.start);
            printk("\n");

            hose = pcibios_alloc_controller(dev);
            if (!hose) {
                  printk("Can't allocate PCI controller structure for %s\n",
                        dev->full_name);
                  continue;
            }
            hose->first_busno = hose->self_busno = bus_range[0];
            hose->last_busno = bus_range[1];

            model = of_get_property(dev, "model", NULL);
            if (model == NULL)
                  model = "<none>";
            if (strncmp(model, "IBM, Python", 11) == 0) {
                  setup_python(hose, dev);
            } else if (is_mot
                     || strncmp(model, "Motorola, Grackle", 17) == 0) {
                  setup_grackle(hose);
            } else if (is_longtrail) {
                  void __iomem *p = ioremap(GG2_PCI_CONFIG_BASE, 0x80000);
                  hose->ops = &gg2_pci_ops;
                  hose->cfg_data = p;
                  gg2_pci_config_base = p;
            } else if (is_pegasos == 1) {
                  setup_indirect_pci(hose, 0xfec00cf8, 0xfee00cfc, 0);
            } else if (is_pegasos == 2) {
                  setup_peg2(hose, dev);
            } else if (!strncmp(model, "IBM,CPC710", 10)) {
                  setup_indirect_pci(hose,
                                 r.start + 0x000f8000,
                                 r.start + 0x000f8010,
                                 0);
                  if (index == 0) {
                        dma = of_get_property(dev, "system-dma-base",
                                          &len);
                        if (dma && len >= sizeof(*dma)) {
                              dma = (unsigned int *)
                                    (((unsigned long)dma) +
                                    len - sizeof(*dma));
                                    pci_dram_offset = *dma;
                        }
                  }
            } else {
                  printk("No methods for %s (model %s), using RTAS\n",
                         dev->full_name, model);
                  hose->ops = &rtas_pci_ops;
            }

            pci_process_bridge_OF_ranges(hose, dev, index == 0);

            /* check the first bridge for a property that we can
               use to set pci_dram_offset */
            dma = of_get_property(dev, "ibm,dma-ranges", &len);
            if (index == 0 && dma != NULL && len >= 6 * sizeof(*dma)) {
                  pci_dram_offset = dma[2] - dma[3];
                  printk("pci_dram_offset = %lx\n", pci_dram_offset);
            }
      }
      of_node_put(root);
}

/* SL82C105 IDE Control/Status Register */
#define SL82C105_IDECSR                0x40

/* Fixup for Winbond ATA quirk, required for briq mostly because the
 * 8259 is configured for level sensitive IRQ 14 and so wants the
 * ATA controller to be set to fully native mode or bad things
 * will happen.
 */
static void __devinit chrp_pci_fixup_winbond_ata(struct pci_dev *sl82c105)
{
      u8 progif;

      /* If non-briq machines need that fixup too, please speak up */
      if (!machine_is(chrp) || _chrp_type != _CHRP_briq)
            return;

      if ((sl82c105->class & 5) != 5) {
            printk("W83C553: Switching SL82C105 IDE to PCI native mode\n");
            /* Enable SL82C105 PCI native IDE mode */
            pci_read_config_byte(sl82c105, PCI_CLASS_PROG, &progif);
            pci_write_config_byte(sl82c105, PCI_CLASS_PROG, progif | 0x05);
            sl82c105->class |= 0x05;
            /* Disable SL82C105 second port */
            pci_write_config_word(sl82c105, SL82C105_IDECSR, 0x0003);
            /* Clear IO BARs, they will be reassigned */
            pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_0, 0);
            pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_1, 0);
            pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_2, 0);
            pci_write_config_dword(sl82c105, PCI_BASE_ADDRESS_3, 0);
      }
}
DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
                  chrp_pci_fixup_winbond_ata);

/* Pegasos2 firmware version 20040810 configures the built-in IDE controller
 * in legacy mode, but sets the PCI registers to PCI native mode.
 * The chip can only operate in legacy mode, so force the PCI class into legacy
 * mode as well. The same fixup must be done to the class-code property in
 * the IDE node /pci@80000000/ide@C,1
 */
static void chrp_pci_fixup_vt8231_ata(struct pci_dev *viaide)
{
      u8 progif;
      struct pci_dev *viaisa;

      if (!machine_is(chrp) || _chrp_type != _CHRP_Pegasos)
            return;
      if (viaide->irq != 14)
            return;

      viaisa = pci_get_device(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_8231, NULL);
      if (!viaisa)
            return;
      dev_info(&viaide->dev, "Fixing VIA IDE, force legacy mode on\n");

      pci_read_config_byte(viaide, PCI_CLASS_PROG, &progif);
      pci_write_config_byte(viaide, PCI_CLASS_PROG, progif & ~0x5);
      viaide->class &= ~0x5;

      pci_dev_put(viaisa);
}
DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_82C586_1, chrp_pci_fixup_vt8231_ata);

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