kernel/arch/powerpc/platforms/embedded6xx/c2k.c

   1 /*
   2  * Board setup routines for the GEFanuc C2K board
   3  *
   4  * Author: Remi Machet <rmachet@slac.stanford.edu>
   5  *
   6  * Originated from prpmc2800.c
   7  *
   8  * 2008 (c) Stanford University
   9  * 2007 (c) MontaVista, Software, Inc.
  10  *
  11  * This program is free software; you can redistribute it and/or modify it
  12  * under the terms of the GNU General Public License version 2 as published
  13  * by the Free Software Foundation.
  14  */
  15
  16 #include <linux/stddef.h>
  17 #include <linux/kernel.h>
  18 #include <linux/delay.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/time.h>
  22 #include <linux/of.h>
  23
  24 #include <asm/machdep.h>
  25 #include <asm/prom.h>
  26 #include <asm/time.h>
  27
  28 #include <mm/mmu_decl.h>
  29
  30 #include <sysdev/mv64x60.h>
  31
  32 #define MV64x60_MPP_CNTL_0      0x0000
  33 #define MV64x60_MPP_CNTL_2      0x0008
  34
  35 #define MV64x60_GPP_IO_CNTL     0x0000
  36 #define MV64x60_GPP_LEVEL_CNTL  0x0010
  37 #define MV64x60_GPP_VALUE_SET   0x0018
  38
  39 static void __iomem *mv64x60_mpp_reg_base;
  40 static void __iomem *mv64x60_gpp_reg_base;
  41
  42 static void __init c2k_setup_arch(void)
  43 {
  44         struct device_node *np;
  45         phys_addr_t paddr;
  46         const unsigned int *reg;
  47
  48         /*
  49          * ioremap mpp and gpp registers in case they are later
  50          * needed by c2k_reset_board().
  51          */
  52         np = of_find_compatible_node(NULL, NULL, "marvell,mv64360-mpp");
  53         reg = of_get_property(np, "reg", NULL);
  54         paddr = of_translate_address(np, reg);
  55         of_node_put(np);
  56         mv64x60_mpp_reg_base = ioremap(paddr, reg[1]);
  57
  58         np = of_find_compatible_node(NULL, NULL, "marvell,mv64360-gpp");
  59         reg = of_get_property(np, "reg", NULL);
  60         paddr = of_translate_address(np, reg);
  61         of_node_put(np);
  62         mv64x60_gpp_reg_base = ioremap(paddr, reg[1]);
  63
  64 #ifdef CONFIG_PCI
  65         mv64x60_pci_init();
  66 #endif
  67 }
  68
  69 static void c2k_reset_board(void)
  70 {
  71         u32 temp;
  72
  73         local_irq_disable();
  74
  75         temp = in_le32(mv64x60_mpp_reg_base + MV64x60_MPP_CNTL_0);
  76         temp &= 0xFFFF0FFF;
  77         out_le32(mv64x60_mpp_reg_base + MV64x60_MPP_CNTL_0, temp);
  78
  79         temp = in_le32(mv64x60_gpp_reg_base + MV64x60_GPP_LEVEL_CNTL);
  80         temp |= 0x00000004;
  81         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_LEVEL_CNTL, temp);
  82
  83         temp = in_le32(mv64x60_gpp_reg_base + MV64x60_GPP_IO_CNTL);
  84         temp |= 0x00000004;
  85         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_IO_CNTL, temp);
  86
  87         temp = in_le32(mv64x60_mpp_reg_base + MV64x60_MPP_CNTL_2);
  88         temp &= 0xFFFF0FFF;
  89         out_le32(mv64x60_mpp_reg_base + MV64x60_MPP_CNTL_2, temp);
  90
  91         temp = in_le32(mv64x60_gpp_reg_base + MV64x60_GPP_LEVEL_CNTL);
  92         temp |= 0x00080000;
  93         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_LEVEL_CNTL, temp);
  94
  95         temp = in_le32(mv64x60_gpp_reg_base + MV64x60_GPP_IO_CNTL);
  96         temp |= 0x00080000;
  97         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_IO_CNTL, temp);
  98
  99         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_VALUE_SET, 0x00080004);
 100 }
 101
 102 static void c2k_restart(char *cmd)
 103 {
 104         c2k_reset_board();
 105         msleep(100);
 106         panic("restart failed\n");
 107 }
 108
 109 #ifdef CONFIG_NOT_COHERENT_CACHE
 110 #define COHERENCY_SETTING "off"
 111 #else
 112 #define COHERENCY_SETTING "on"
 113 #endif
 114
 115 void c2k_show_cpuinfo(struct seq_file *m)
 116 {
 117         seq_printf(m, "Vendor\t\t: GEFanuc\n");
 118         seq_printf(m, "coherency\t: %s\n", COHERENCY_SETTING);
 119 }
 120
 121 /*
 122  * Called very early, device-tree isn't unflattened
 123  */
 124 static int __init c2k_probe(void)
 125 {
 126         unsigned long root = of_get_flat_dt_root();
 127
 128         if (!of_flat_dt_is_compatible(root, "GEFanuc,C2K"))
 129                 return 0;
 130
 131         printk(KERN_INFO "Detected a GEFanuc C2K board\n");
 132
 133         _set_L2CR(0);
 134         _set_L2CR(L2CR_L2E | L2CR_L2PE | L2CR_L2I);
 135         return 1;
 136 }
 137
 138 define_machine(c2k) {
 139         .name                   = "C2K",
 140         .probe                  = c2k_probe,
 141         .setup_arch             = c2k_setup_arch,
 142         .init_early             = mv64x60_init_early,
 143         .show_cpuinfo           = c2k_show_cpuinfo,
 144         .init_IRQ               = mv64x60_init_irq,
 145         .get_irq                = mv64x60_get_irq,
 146         .restart                = c2k_restart,
 147         .calibrate_decr         = generic_calibrate_decr,
 148 };