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holly.c

/*
 * Board setup routines for the IBM 750GX/CL platform w/ TSI10x bridge
 *
 * Copyright 2007 IBM Corporation
 *
 * Stephen Winiecki <stevewin@us.ibm.com>
 * Josh Boyer <jwboyer@linux.vnet.ibm.com>
 *
 * Based on code from mpc7448_hpc2.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * version 2 as published by the Free Software Foundation.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_core.h>
#include <linux/of_platform.h>

#include <asm/system.h>
#include <asm/time.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/udbg.h>
#include <asm/tsi108.h>
#include <asm/pci-bridge.h>
#include <asm/reg.h>
#include <mm/mmu_decl.h>
#include <asm/tsi108_irq.h>
#include <asm/tsi108_pci.h>
#include <asm/mpic.h>

#undef DEBUG

#define HOLLY_PCI_CFG_PHYS 0x7c000000

int holly_exclude_device(struct pci_controller *hose, u_char bus, u_char devfn)
{
      if (bus == 0 && PCI_SLOT(devfn) == 0)
            return PCIBIOS_DEVICE_NOT_FOUND;
      else
            return PCIBIOS_SUCCESSFUL;
}

static void holly_remap_bridge(void)
{
      u32 lut_val, lut_addr;
      int i;

      printk(KERN_INFO "Remapping PCI bridge\n");

      /* Re-init the PCI bridge and LUT registers to have mappings that don't
       * rely on PIBS
       */
      lut_addr = 0x900;
      for (i = 0; i < 31; i++) {
            tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000201);
            lut_addr += 4;
            tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);
            lut_addr += 4;
      }

      /* Reserve the last LUT entry for PCI I/O space */
      tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x00000241);
      lut_addr += 4;
      tsi108_write_reg(TSI108_PB_OFFSET + lut_addr, 0x0);

      /* Map PCI I/O space */
      tsi108_write_reg(TSI108_PCI_PFAB_IO_UPPER, 0x0);
      tsi108_write_reg(TSI108_PCI_PFAB_IO, 0x1);

      /* Map PCI CFG space */
      tsi108_write_reg(TSI108_PCI_PFAB_BAR0_UPPER, 0x0);
      tsi108_write_reg(TSI108_PCI_PFAB_BAR0, 0x7c000000 | 0x01);

      /* We don't need MEM32 and PRM remapping so disable them */
      tsi108_write_reg(TSI108_PCI_PFAB_MEM32, 0x0);
      tsi108_write_reg(TSI108_PCI_PFAB_PFM3, 0x0);
      tsi108_write_reg(TSI108_PCI_PFAB_PFM4, 0x0);

      /* Set P2O_BAR0 */
      tsi108_write_reg(TSI108_PCI_P2O_BAR0_UPPER, 0x0);
      tsi108_write_reg(TSI108_PCI_P2O_BAR0, 0xc0000000);

      /* Init the PCI LUTs to do no remapping */
      lut_addr = 0x500;
      lut_val = 0x00000002;

      for (i = 0; i < 32; i++) {
            tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, lut_val);
            lut_addr += 4;
            tsi108_write_reg(TSI108_PCI_OFFSET + lut_addr, 0x40000000);
            lut_addr += 4;
            lut_val += 0x02000000;
      }
      tsi108_write_reg(TSI108_PCI_P2O_PAGE_SIZES, 0x00007900);

      /* Set 64-bit PCI bus address for system memory */
      tsi108_write_reg(TSI108_PCI_P2O_BAR2_UPPER, 0x0);
      tsi108_write_reg(TSI108_PCI_P2O_BAR2, 0x0);
}

static void __init holly_setup_arch(void)
{
      struct device_node *np;

      if (ppc_md.progress)
            ppc_md.progress("holly_setup_arch():set_bridge", 0);

      tsi108_csr_vir_base = get_vir_csrbase();

      /* setup PCI host bridge */
      holly_remap_bridge();

      np = of_find_node_by_type(NULL, "pci");
      if (np)
            tsi108_setup_pci(np, HOLLY_PCI_CFG_PHYS, 1);

      ppc_md.pci_exclude_device = holly_exclude_device;
      if (ppc_md.progress)
            ppc_md.progress("tsi108: resources set", 0x100);

      printk(KERN_INFO "PPC750GX/CL Platform\n");
}

/*
 * Interrupt setup and service.  Interrupts on the holly come
 * from the four external INT pins, PCI interrupts are routed via
 * PCI interrupt control registers, it generates internal IRQ23
 *
 * Interrupt routing on the Holly Board:
 * TSI108:PB_INT[0] -> CPU0:INT#
 * TSI108:PB_INT[1] -> CPU0:MCP#
 * TSI108:PB_INT[2] -> N/C
 * TSI108:PB_INT[3] -> N/C
 */
static void __init holly_init_IRQ(void)
{
      struct mpic *mpic;
      phys_addr_t mpic_paddr = 0;
      struct device_node *tsi_pic;
#ifdef CONFIG_PCI
      unsigned int cascade_pci_irq;
      struct device_node *tsi_pci;
      struct device_node *cascade_node = NULL;
#endif

      tsi_pic = of_find_node_by_type(NULL, "open-pic");
      if (tsi_pic) {
            unsigned int size;
            const void *prop = of_get_property(tsi_pic, "reg", &size);
            mpic_paddr = of_translate_address(tsi_pic, prop);
      }

      if (mpic_paddr == 0) {
            printk(KERN_ERR "%s: No tsi108 PIC found !\n", __func__);
            return;
      }

      pr_debug("%s: tsi108 pic phys_addr = 0x%x\n", __func__, (u32) mpic_paddr);

      mpic = mpic_alloc(tsi_pic, mpic_paddr,
                  MPIC_PRIMARY | MPIC_BIG_ENDIAN | MPIC_WANTS_RESET |
                  MPIC_SPV_EOI | MPIC_NO_PTHROU_DIS | MPIC_REGSET_TSI108,
                  24,
                  NR_IRQS-4, /* num_sources used */
                  "Tsi108_PIC");

      BUG_ON(mpic == NULL);

      mpic_assign_isu(mpic, 0, mpic_paddr + 0x100);

      mpic_init(mpic);

#ifdef CONFIG_PCI
      tsi_pci = of_find_node_by_type(NULL, "pci");
      if (tsi_pci == NULL) {
            printk(KERN_ERR "%s: No tsi108 pci node found !\n", __func__);
            return;
      }

      cascade_node = of_find_node_by_type(NULL, "pic-router");
      if (cascade_node == NULL) {
            printk(KERN_ERR "%s: No tsi108 pci cascade node found !\n", __func__);
            return;
      }

      cascade_pci_irq = irq_of_parse_and_map(tsi_pci, 0);
      pr_debug("%s: tsi108 cascade_pci_irq = 0x%x\n", __func__, (u32) cascade_pci_irq);
      tsi108_pci_int_init(cascade_node);
      set_irq_data(cascade_pci_irq, mpic);
      set_irq_chained_handler(cascade_pci_irq, tsi108_irq_cascade);
#endif
      /* Configure MPIC outputs to CPU0 */
      tsi108_write_reg(TSI108_MPIC_OFFSET + 0x30c, 0);
      of_node_put(tsi_pic);
}

void holly_show_cpuinfo(struct seq_file *m)
{
      seq_printf(m, "vendor\t\t: IBM\n");
      seq_printf(m, "machine\t\t: PPC750 GX/CL\n");
}

void holly_restart(char *cmd)
{
      __be32 __iomem *ocn_bar1 = NULL;
      unsigned long bar;
      struct device_node *bridge = NULL;
      const void *prop;
      int size;
      phys_addr_t addr = 0xc0000000;

      local_irq_disable();

      bridge = of_find_node_by_type(NULL, "tsi-bridge");
      if (bridge) {
            prop = of_get_property(bridge, "reg", &size);
            addr = of_translate_address(bridge, prop);
      }
      addr += (TSI108_PB_OFFSET + 0x414);

      ocn_bar1 = ioremap(addr, 0x4);

      /* Turn on the BOOT bit so the addresses are correctly
       * routed to the HLP interface */
      bar = ioread32be(ocn_bar1);
      bar |= 2;
      iowrite32be(bar, ocn_bar1);
      iosync();

      /* Set SRR0 to the reset vector and turn on MSR_IP */
      mtspr(SPRN_SRR0, 0xfff00100);
      mtspr(SPRN_SRR1, MSR_IP);

      /* Do an rfi to jump back to firmware.  Somewhat evil,
       * but it works
       */
      __asm__ __volatile__("rfi" : : : "memory");

      /* Spin until reset happens.  Shouldn't really get here */
      for (;;) ;
}

void holly_power_off(void)
{
      local_irq_disable();
      /* No way to shut power off with software */
      for (;;) ;
}

void holly_halt(void)
{
      holly_power_off();
}

/*
 * Called very early, device-tree isn't unflattened
 */
static int __init holly_probe(void)
{
      unsigned long root = of_get_flat_dt_root();

      if (!of_flat_dt_is_compatible(root, "ibm,holly"))
            return 0;
      return 1;
}

static int ppc750_machine_check_exception(struct pt_regs *regs)
{
      const struct exception_table_entry *entry;

      /* Are we prepared to handle this fault */
      if ((entry = search_exception_tables(regs->nip)) != NULL) {
            tsi108_clear_pci_cfg_error();
            regs->msr |= MSR_RI;
            regs->nip = entry->fixup;
            return 1;
      }
      return 0;
}

define_machine(holly){
      .name                         = "PPC750 GX/CL TSI",
      .probe                        = holly_probe,
      .setup_arch                   = holly_setup_arch,
      .init_IRQ                     = holly_init_IRQ,
      .show_cpuinfo                 = holly_show_cpuinfo,
      .get_irq                      = mpic_get_irq,
      .restart                      = holly_restart,
      .calibrate_decr               = generic_calibrate_decr,
      .machine_check_exception      = ppc750_machine_check_exception,
      .progress                     = udbg_progress,
};

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