linux/arch/powerpc/platforms/86xx/gef_sbc310.c
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   1/*
   2 * GE SBC310 board support
   3 *
   4 * Author: Martyn Welch <martyn.welch@ge.com>
   5 *
   6 * Copyright 2008 GE Intelligent Platforms Embedded Systems, Inc.
   7 *
   8 * This program is free software; you can redistribute  it and/or modify it
   9 * under  the terms of  the GNU General  Public License as published by the
  10 * Free Software Foundation;  either version 2 of the  License, or (at your
  11 * option) any later version.
  12 *
  13 * Based on: mpc86xx_hpcn.c (MPC86xx HPCN board specific routines)
  14 * Copyright 2006 Freescale Semiconductor Inc.
  15 *
  16 * NEC fixup adapted from arch/mips/pci/fixup-lm2e.c
  17 */
  18
  19#include <linux/stddef.h>
  20#include <linux/kernel.h>
  21#include <linux/pci.h>
  22#include <linux/kdev_t.h>
  23#include <linux/delay.h>
  24#include <linux/seq_file.h>
  25#include <linux/of_platform.h>
  26
  27#include <asm/system.h>
  28#include <asm/time.h>
  29#include <asm/machdep.h>
  30#include <asm/pci-bridge.h>
  31#include <asm/prom.h>
  32#include <mm/mmu_decl.h>
  33#include <asm/udbg.h>
  34
  35#include <asm/mpic.h>
  36#include <asm/nvram.h>
  37
  38#include <sysdev/fsl_pci.h>
  39#include <sysdev/fsl_soc.h>
  40
  41#include "mpc86xx.h"
  42#include "gef_pic.h"
  43
  44#undef DEBUG
  45
  46#ifdef DEBUG
  47#define DBG (fmt...) do { printk(KERN_ERR "SBC310: " fmt); } while (0)
  48#else
  49#define DBG (fmt...) do { } while (0)
  50#endif
  51
  52void __iomem *sbc310_regs;
  53
  54static void __init gef_sbc310_init_irq(void)
  55{
  56        struct device_node *cascade_node = NULL;
  57
  58        mpc86xx_init_irq();
  59
  60        /*
  61         * There is a simple interrupt handler in the main FPGA, this needs
  62         * to be cascaded into the MPIC
  63         */
  64        cascade_node = of_find_compatible_node(NULL, NULL, "gef,fpga-pic");
  65        if (!cascade_node) {
  66                printk(KERN_WARNING "SBC310: No FPGA PIC\n");
  67                return;
  68        }
  69
  70        gef_pic_init(cascade_node);
  71        of_node_put(cascade_node);
  72}
  73
  74static void __init gef_sbc310_setup_arch(void)
  75{
  76        struct device_node *regs;
  77#ifdef CONFIG_PCI
  78        struct device_node *np;
  79
  80        for_each_compatible_node(np, "pci", "fsl,mpc8641-pcie") {
  81                fsl_add_bridge(np, 1);
  82        }
  83#endif
  84
  85        printk(KERN_INFO "GE Intelligent Platforms SBC310 6U VPX SBC\n");
  86
  87#ifdef CONFIG_SMP
  88        mpc86xx_smp_init();
  89#endif
  90
  91        /* Remap basic board registers */
  92        regs = of_find_compatible_node(NULL, NULL, "gef,fpga-regs");
  93        if (regs) {
  94                sbc310_regs = of_iomap(regs, 0);
  95                if (sbc310_regs == NULL)
  96                        printk(KERN_WARNING "Unable to map board registers\n");
  97                of_node_put(regs);
  98        }
  99
 100#if defined(CONFIG_MMIO_NVRAM)
 101        mmio_nvram_init();
 102#endif
 103}
 104
 105/* Return the PCB revision */
 106static unsigned int gef_sbc310_get_board_id(void)
 107{
 108        unsigned int reg;
 109
 110        reg = ioread32(sbc310_regs);
 111        return reg & 0xff;
 112}
 113
 114/* Return the PCB revision */
 115static unsigned int gef_sbc310_get_pcb_rev(void)
 116{
 117        unsigned int reg;
 118
 119        reg = ioread32(sbc310_regs);
 120        return (reg >> 8) & 0xff;
 121}
 122
 123/* Return the board (software) revision */
 124static unsigned int gef_sbc310_get_board_rev(void)
 125{
 126        unsigned int reg;
 127
 128        reg = ioread32(sbc310_regs);
 129        return (reg >> 16) & 0xff;
 130}
 131
 132/* Return the FPGA revision */
 133static unsigned int gef_sbc310_get_fpga_rev(void)
 134{
 135        unsigned int reg;
 136
 137        reg = ioread32(sbc310_regs);
 138        return (reg >> 24) & 0xf;
 139}
 140
 141static void gef_sbc310_show_cpuinfo(struct seq_file *m)
 142{
 143        uint svid = mfspr(SPRN_SVR);
 144
 145        seq_printf(m, "Vendor\t\t: GE Intelligent Platforms\n");
 146
 147        seq_printf(m, "Board ID\t: 0x%2.2x\n", gef_sbc310_get_board_id());
 148        seq_printf(m, "Revision\t: %u%c\n", gef_sbc310_get_pcb_rev(),
 149                ('A' + gef_sbc310_get_board_rev() - 1));
 150        seq_printf(m, "FPGA Revision\t: %u\n", gef_sbc310_get_fpga_rev());
 151
 152        seq_printf(m, "SVR\t\t: 0x%x\n", svid);
 153
 154}
 155
 156static void __init gef_sbc310_nec_fixup(struct pci_dev *pdev)
 157{
 158        unsigned int val;
 159
 160        /* Do not do the fixup on other platforms! */
 161        if (!machine_is(gef_sbc310))
 162                return;
 163
 164        printk(KERN_INFO "Running NEC uPD720101 Fixup\n");
 165
 166        /* Ensure only ports 1 & 2 are enabled */
 167        pci_read_config_dword(pdev, 0xe0, &val);
 168        pci_write_config_dword(pdev, 0xe0, (val & ~7) | 0x2);
 169
 170        /* System clock is 48-MHz Oscillator and EHCI Enabled. */
 171        pci_write_config_dword(pdev, 0xe4, 1 << 5);
 172}
 173DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_NEC, PCI_DEVICE_ID_NEC_USB,
 174        gef_sbc310_nec_fixup);
 175
 176/*
 177 * Called very early, device-tree isn't unflattened
 178 *
 179 * This function is called to determine whether the BSP is compatible with the
 180 * supplied device-tree, which is assumed to be the correct one for the actual
 181 * board. It is expected thati, in the future, a kernel may support multiple
 182 * boards.
 183 */
 184static int __init gef_sbc310_probe(void)
 185{
 186        unsigned long root = of_get_flat_dt_root();
 187
 188        if (of_flat_dt_is_compatible(root, "gef,sbc310"))
 189                return 1;
 190
 191        return 0;
 192}
 193
 194static long __init mpc86xx_time_init(void)
 195{
 196        unsigned int temp;
 197
 198        /* Set the time base to zero */
 199        mtspr(SPRN_TBWL, 0);
 200        mtspr(SPRN_TBWU, 0);
 201
 202        temp = mfspr(SPRN_HID0);
 203        temp |= HID0_TBEN;
 204        mtspr(SPRN_HID0, temp);
 205        asm volatile("isync");
 206
 207        return 0;
 208}
 209
 210static __initdata struct of_device_id of_bus_ids[] = {
 211        { .compatible = "simple-bus", },
 212        { .compatible = "gianfar", },
 213        {},
 214};
 215
 216static int __init declare_of_platform_devices(void)
 217{
 218        printk(KERN_DEBUG "Probe platform devices\n");
 219        of_platform_bus_probe(NULL, of_bus_ids, NULL);
 220
 221        return 0;
 222}
 223machine_device_initcall(gef_sbc310, declare_of_platform_devices);
 224
 225define_machine(gef_sbc310) {
 226        .name                   = "GE SBC310",
 227        .probe                  = gef_sbc310_probe,
 228        .setup_arch             = gef_sbc310_setup_arch,
 229        .init_IRQ               = gef_sbc310_init_irq,
 230        .show_cpuinfo           = gef_sbc310_show_cpuinfo,
 231        .get_irq                = mpic_get_irq,
 232        .restart                = fsl_rstcr_restart,
 233        .time_init              = mpc86xx_time_init,
 234        .calibrate_decr         = generic_calibrate_decr,
 235        .progress               = udbg_progress,
 236#ifdef CONFIG_PCI
 237        .pcibios_fixup_bus      = fsl_pcibios_fixup_bus,
 238#endif
 239};
 240