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yucca.c

/*
 * Yucca board specific routines
 *
 * Roland Dreier <rolandd@cisco.com> (based on luan.c by Matt Porter)
 *
 * Copyright 2004-2005 MontaVista Software Inc.
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/stddef.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/pci.h>
#include <linux/kdev_t.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/console.h>
#include <linux/delay.h>
#include <linux/ide.h>
#include <linux/initrd.h>
#include <linux/seq_file.h>
#include <linux/root_dev.h>
#include <linux/tty.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_8250.h>

#include <asm/system.h>
#include <asm/pgtable.h>
#include <asm/page.h>
#include <asm/dma.h>
#include <asm/io.h>
#include <asm/machdep.h>
#include <asm/ocp.h>
#include <asm/pci-bridge.h>
#include <asm/time.h>
#include <asm/todc.h>
#include <asm/bootinfo.h>
#include <asm/ppc4xx_pic.h>
#include <asm/ppcboot.h>

#include <syslib/ibm44x_common.h>
#include <syslib/ibm440gx_common.h>
#include <syslib/ibm440sp_common.h>
#include <syslib/ppc440spe_pcie.h>

extern bd_t __res;

static struct ibm44x_clocks clocks __initdata;

static void __init
yucca_calibrate_decr(void)
{
      unsigned int freq;

      if (mfspr(SPRN_CCR1) & CCR1_TCS)
            freq = YUCCA_TMR_CLK;
      else
            freq = clocks.cpu;

      ibm44x_calibrate_decr(freq);
}

static int
yucca_show_cpuinfo(struct seq_file *m)
{
      seq_printf(m, "vendor\t\t: AMCC\n");
      seq_printf(m, "machine\t\t: PPC440SPe EVB (Yucca)\n");

      return 0;
}

static enum {
      HOSE_UNKNOWN,
      HOSE_PCIX,
      HOSE_PCIE0,
      HOSE_PCIE1,
      HOSE_PCIE2
} hose_type[4];

static inline int
yucca_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
{
      struct pci_controller *hose = pci_bus_to_hose(dev->bus->number);

      if (hose_type[hose->index] == HOSE_PCIX) {
            static char pci_irq_table[][4] =
            /*
             *    PCI IDSEL/INTPIN->INTLINE
             *      A   B   C   D
             */
            {
                  { 81, -1, -1, -1 },     /* IDSEL 1 - PCIX0 Slot 0 */
            };
            const long min_idsel = 1, max_idsel = 1, irqs_per_slot = 4;
            return PCI_IRQ_TABLE_LOOKUP;
      } else if (hose_type[hose->index] == HOSE_PCIE0) {
            static char pci_irq_table[][4] =
            /*
             *    PCI IDSEL/INTPIN->INTLINE
             *      A   B   C   D
             */
            {
                  { 96, 97, 98, 99 },
            };
            const long min_idsel = 1, max_idsel = 1, irqs_per_slot = 4;
            return PCI_IRQ_TABLE_LOOKUP;
      } else if (hose_type[hose->index] == HOSE_PCIE1) {
            static char pci_irq_table[][4] =
            /*
             *    PCI IDSEL/INTPIN->INTLINE
             *      A   B   C   D
             */
            {
                  { 100, 101, 102, 103 },
            };
            const long min_idsel = 1, max_idsel = 1, irqs_per_slot = 4;
            return PCI_IRQ_TABLE_LOOKUP;
      } else if (hose_type[hose->index] == HOSE_PCIE2) {
            static char pci_irq_table[][4] =
            /*
             *    PCI IDSEL/INTPIN->INTLINE
             *      A   B   C   D
             */
            {
                  { 104, 105, 106, 107 },
            };
            const long min_idsel = 1, max_idsel = 1, irqs_per_slot = 4;
            return PCI_IRQ_TABLE_LOOKUP;
      }
      return -1;
}

static void __init yucca_set_emacdata(void)
{
      struct ocp_def *def;
      struct ocp_func_emac_data *emacdata;

      /* Set phy_map, phy_mode, and mac_addr for the EMAC */
      def = ocp_get_one_device(OCP_VENDOR_IBM, OCP_FUNC_EMAC, 0);
      emacdata = def->additions;
      emacdata->phy_map = 0x00000001;     /* Skip 0x00 */
      emacdata->phy_mode = PHY_MODE_GMII;
      memcpy(emacdata->mac_addr, __res.bi_enetaddr, 6);
}

static int __init yucca_pcie_card_present(int port)
{
   void __iomem *pcie_fpga_base;
   u16 reg;

   pcie_fpga_base = ioremap64(YUCCA_FPGA_REG_BASE, YUCCA_FPGA_REG_SIZE);
   reg = in_be16(pcie_fpga_base + FPGA_REG1C);
   iounmap(pcie_fpga_base);

   switch(port) {
   case 0: return !(reg & FPGA_REG1C_PE0_PRSNT);
   case 1: return !(reg & FPGA_REG1C_PE1_PRSNT);
   case 2: return !(reg & FPGA_REG1C_PE2_PRSNT);
   default: return 0;
   }
}

/*
 * For the given slot, set rootpoint mode, send power to the slot,
 * turn on the green LED and turn off the yellow LED, enable the clock
 * and turn off reset.
 */
static void __init yucca_setup_pcie_fpga_rootpoint(int port)
{
      void __iomem *pcie_reg_fpga_base;
      u16 power, clock, green_led, yellow_led, reset_off, rootpoint, endpoint;

      pcie_reg_fpga_base = ioremap64(YUCCA_FPGA_REG_BASE, YUCCA_FPGA_REG_SIZE);

      switch(port) {
      case 0:
            rootpoint   = FPGA_REG1C_PE0_ROOTPOINT;
            endpoint    = 0;
            power           = FPGA_REG1A_PE0_PWRON;
            green_led   = FPGA_REG1A_PE0_GLED;
            clock           = FPGA_REG1A_PE0_REFCLK_ENABLE;
            yellow_led  = FPGA_REG1A_PE0_YLED;
            reset_off   = FPGA_REG1C_PE0_PERST;
            break;
      case 1:
            rootpoint   = 0;
            endpoint    = FPGA_REG1C_PE1_ENDPOINT;
            power           = FPGA_REG1A_PE1_PWRON;
            green_led   = FPGA_REG1A_PE1_GLED;
            clock           = FPGA_REG1A_PE1_REFCLK_ENABLE;
            yellow_led  = FPGA_REG1A_PE1_YLED;
            reset_off   = FPGA_REG1C_PE1_PERST;
            break;
      case 2:
            rootpoint   = 0;
            endpoint    = FPGA_REG1C_PE2_ENDPOINT;
            power           = FPGA_REG1A_PE2_PWRON;
            green_led   = FPGA_REG1A_PE2_GLED;
            clock           = FPGA_REG1A_PE2_REFCLK_ENABLE;
            yellow_led  = FPGA_REG1A_PE2_YLED;
            reset_off   = FPGA_REG1C_PE2_PERST;
            break;

      default:
            iounmap(pcie_reg_fpga_base);
            return;
      }

      out_be16(pcie_reg_fpga_base + FPGA_REG1A,
             ~(power | clock | green_led) &
             (yellow_led | in_be16(pcie_reg_fpga_base + FPGA_REG1A)));
      out_be16(pcie_reg_fpga_base + FPGA_REG1C,
             ~(endpoint | reset_off) &
             (rootpoint | in_be16(pcie_reg_fpga_base + FPGA_REG1C)));

      /*
       * Leave device in reset for a while after powering on the
       * slot to give it a chance to initialize.
       */
      mdelay(250);

      out_be16(pcie_reg_fpga_base + FPGA_REG1C,
             reset_off | in_be16(pcie_reg_fpga_base + FPGA_REG1C));

      iounmap(pcie_reg_fpga_base);
}

static void __init
yucca_setup_hoses(void)
{
      struct pci_controller *hose;
      char name[20];
      int i;

      if (0 && ppc440spe_init_pcie()) {
            printk(KERN_WARNING "PPC440SPe PCI Express initialization failed\n");
            return;
      }

      for (i = 0; i <= 2; ++i) {
            if (!yucca_pcie_card_present(i))
                  continue;

            printk(KERN_INFO "PCIE%d: card present\n", i);
            yucca_setup_pcie_fpga_rootpoint(i);
            if (ppc440spe_init_pcie_rootport(i)) {
                  printk(KERN_WARNING "PCIE%d: initialization failed\n", i);
                  continue;
            }

            hose = pcibios_alloc_controller();
            if (!hose)
                  return;

            sprintf(name, "PCIE%d host bridge", i);
            pci_init_resource(&hose->io_resource,
                          YUCCA_PCIX_LOWER_IO,
                          YUCCA_PCIX_UPPER_IO,
                          IORESOURCE_IO,
                          name);

            hose->mem_space.start = YUCCA_PCIE_LOWER_MEM +
                  i * YUCCA_PCIE_MEM_SIZE;
            hose->mem_space.end   = hose->mem_space.start +
                  YUCCA_PCIE_MEM_SIZE - 1;

            pci_init_resource(&hose->mem_resources[0],
                          hose->mem_space.start,
                          hose->mem_space.end,
                          IORESOURCE_MEM,
                          name);

            hose->first_busno = 0;
            hose->last_busno  = 15;
            hose_type[hose->index] = HOSE_PCIE0 + i;

            ppc440spe_setup_pcie(hose, i);
            hose->last_busno = pciauto_bus_scan(hose, hose->first_busno);
      }

      ppc_md.pci_swizzle = common_swizzle;
      ppc_md.pci_map_irq = yucca_map_irq;
}

TODC_ALLOC();

static void __init
yucca_early_serial_map(void)
{
      struct uart_port port;

      /* Setup ioremapped serial port access */
      memset(&port, 0, sizeof(port));
      port.membase = ioremap64(PPC440SPE_UART0_ADDR, 8);
      port.irq = UART0_INT;
      port.uartclk = clocks.uart0;
      port.regshift = 0;
      port.iotype = UPIO_MEM;
      port.flags = UPF_BOOT_AUTOCONF | UPF_SKIP_TEST;
      port.line = 0;

      if (early_serial_setup(&port) != 0) {
            printk("Early serial init of port 0 failed\n");
      }

      port.membase = ioremap64(PPC440SPE_UART1_ADDR, 8);
      port.irq = UART1_INT;
      port.uartclk = clocks.uart1;
      port.line = 1;

      if (early_serial_setup(&port) != 0) {
            printk("Early serial init of port 1 failed\n");
      }

      port.membase = ioremap64(PPC440SPE_UART2_ADDR, 8);
      port.irq = UART2_INT;
      port.uartclk = BASE_BAUD;
      port.line = 2;

      if (early_serial_setup(&port) != 0) {
            printk("Early serial init of port 2 failed\n");
      }
}

static void __init
yucca_setup_arch(void)
{
      yucca_set_emacdata();

#if !defined(CONFIG_BDI_SWITCH)
      /*
       * The Abatron BDI JTAG debugger does not tolerate others
       * mucking with the debug registers.
       */
      mtspr(SPRN_DBCR0, (DBCR0_TDE | DBCR0_IDM));
#endif

      /*
       * Determine various clocks.
       * To be completely correct we should get SysClk
       * from FPGA, because it can be changed by on-board switches
       * --ebs
       */
      /* 440GX and 440SPe clocking is the same - rd */
      ibm440gx_get_clocks(&clocks, 33333333, 6 * 1843200);
      ocp_sys_info.opb_bus_freq = clocks.opb;

      /* init to some ~sane value until calibrate_delay() runs */
      loops_per_jiffy = 50000000/HZ;

      /* Setup PCIXn host bridges */
      yucca_setup_hoses();

#ifdef CONFIG_BLK_DEV_INITRD
      if (initrd_start)
            ROOT_DEV = Root_RAM0;
      else
#endif
#ifdef CONFIG_ROOT_NFS
            ROOT_DEV = Root_NFS;
#else
            ROOT_DEV = Root_HDA1;
#endif

      yucca_early_serial_map();

      /* Identify the system */
      printk("Yucca port (Roland Dreier <rolandd@cisco.com>)\n");
}

void __init platform_init(unsigned long r3, unsigned long r4,
            unsigned long r5, unsigned long r6, unsigned long r7)
{
      ibm44x_platform_init(r3, r4, r5, r6, r7);

      ppc_md.setup_arch = yucca_setup_arch;
      ppc_md.show_cpuinfo = yucca_show_cpuinfo;
      ppc_md.find_end_of_memory = ibm440sp_find_end_of_memory;
      ppc_md.get_irq = NULL;        /* Set in ppc4xx_pic_init() */

      ppc_md.calibrate_decr = yucca_calibrate_decr;
#ifdef CONFIG_KGDB
      ppc_md.early_serial_map = yucca_early_serial_map;
#endif
}

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