release/src-rt-6.x.4708/linux/linux-2.6.36/arch/powerpc/platforms/embedded6xx/prpmc2800.c

   1 /*
   2  * Board setup routines for the Motorola PrPMC2800
   3  *
   4  * Author: Dale Farnsworth <dale@farnsworth.org>
   5  *
   6  * 2007 (c) MontaVista, Software, Inc.  This file is licensed under
   7  * the terms of the GNU General Public License version 2.  This program
   8  * is licensed "as is" without any warranty of any kind, whether express
   9  * or implied.
  10  */
  11
  12 #include <linux/stddef.h>
  13 #include <linux/kernel.h>
  14 #include <linux/delay.h>
  15 #include <linux/interrupt.h>
  16 #include <linux/seq_file.h>
  17
  18 #include <asm/machdep.h>
  19 #include <asm/prom.h>
  20 #include <asm/system.h>
  21 #include <asm/time.h>
  22
  23 #include <mm/mmu_decl.h>
  24
  25 #include <sysdev/mv64x60.h>
  26
  27 #define MV64x60_MPP_CNTL_0      0x0000
  28 #define MV64x60_MPP_CNTL_2      0x0008
  29
  30 #define MV64x60_GPP_IO_CNTL     0x0000
  31 #define MV64x60_GPP_LEVEL_CNTL  0x0010
  32 #define MV64x60_GPP_VALUE_SET   0x0018
  33
  34 #define PLATFORM_NAME_MAX       32
  35
  36 static char prpmc2800_platform_name[PLATFORM_NAME_MAX];
  37
  38 static void __iomem *mv64x60_mpp_reg_base;
  39 static void __iomem *mv64x60_gpp_reg_base;
  40
  41 static void __init prpmc2800_setup_arch(void)
  42 {
  43         struct device_node *np;
  44         phys_addr_t paddr;
  45         const unsigned int *reg;
  46
  47         /*
  48          * ioremap mpp and gpp registers in case they are later
  49          * needed by prpmc2800_reset_board().
  50          */
  51         np = of_find_compatible_node(NULL, NULL, "marvell,mv64360-mpp");
  52         reg = of_get_property(np, "reg", NULL);
  53         paddr = of_translate_address(np, reg);
  54         of_node_put(np);
  55         mv64x60_mpp_reg_base = ioremap(paddr, reg[1]);
  56
  57         np = of_find_compatible_node(NULL, NULL, "marvell,mv64360-gpp");
  58         reg = of_get_property(np, "reg", NULL);
  59         paddr = of_translate_address(np, reg);
  60         of_node_put(np);
  61         mv64x60_gpp_reg_base = ioremap(paddr, reg[1]);
  62
  63 #ifdef CONFIG_PCI
  64         mv64x60_pci_init();
  65 #endif
  66
  67         printk("Motorola %s\n", prpmc2800_platform_name);
  68 }
  69
  70 static void prpmc2800_reset_board(void)
  71 {
  72         u32 temp;
  73
  74         local_irq_disable();
  75
  76         temp = in_le32(mv64x60_mpp_reg_base + MV64x60_MPP_CNTL_0);
  77         temp &= 0xFFFF0FFF;
  78         out_le32(mv64x60_mpp_reg_base + MV64x60_MPP_CNTL_0, temp);
  79
  80         temp = in_le32(mv64x60_gpp_reg_base + MV64x60_GPP_LEVEL_CNTL);
  81         temp |= 0x00000004;
  82         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_LEVEL_CNTL, temp);
  83
  84         temp = in_le32(mv64x60_gpp_reg_base + MV64x60_GPP_IO_CNTL);
  85         temp |= 0x00000004;
  86         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_IO_CNTL, temp);
  87
  88         temp = in_le32(mv64x60_mpp_reg_base + MV64x60_MPP_CNTL_2);
  89         temp &= 0xFFFF0FFF;
  90         out_le32(mv64x60_mpp_reg_base + MV64x60_MPP_CNTL_2, temp);
  91
  92         temp = in_le32(mv64x60_gpp_reg_base + MV64x60_GPP_LEVEL_CNTL);
  93         temp |= 0x00080000;
  94         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_LEVEL_CNTL, temp);
  95
  96         temp = in_le32(mv64x60_gpp_reg_base + MV64x60_GPP_IO_CNTL);
  97         temp |= 0x00080000;
  98         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_IO_CNTL, temp);
  99
 100         out_le32(mv64x60_gpp_reg_base + MV64x60_GPP_VALUE_SET, 0x00080004);
 101 }
 102
 103 static void prpmc2800_restart(char *cmd)
 104 {
 105         volatile ulong i = 10000000;
 106
 107         prpmc2800_reset_board();
 108
 109         while (i-- > 0);
 110         panic("restart failed\n");
 111 }
 112
 113 #ifdef CONFIG_NOT_COHERENT_CACHE
 114 #define PPRPM2800_COHERENCY_SETTING "off"
 115 #else
 116 #define PPRPM2800_COHERENCY_SETTING "on"
 117 #endif
 118
 119 void prpmc2800_show_cpuinfo(struct seq_file *m)
 120 {
 121         seq_printf(m, "Vendor\t\t: Motorola\n");
 122         seq_printf(m, "coherency\t: %s\n", PPRPM2800_COHERENCY_SETTING);
 123 }
 124
 125 /*
 126  * Called very early, device-tree isn't unflattened
 127  */
 128 static int __init prpmc2800_probe(void)
 129 {
 130         unsigned long root = of_get_flat_dt_root();
 131         unsigned long len = PLATFORM_NAME_MAX;
 132         void *m;
 133
 134         if (!of_flat_dt_is_compatible(root, "motorola,PrPMC2800"))
 135                 return 0;
 136
 137         /* Update ppc_md.name with name from dt */
 138         m = of_get_flat_dt_prop(root, "model", &len);
 139         if (m)
 140                 strncpy(prpmc2800_platform_name, m,
 141                         min((int)len, PLATFORM_NAME_MAX - 1));
 142
 143         _set_L2CR(_get_L2CR() | L2CR_L2E);
 144         return 1;
 145 }
 146
 147 define_machine(prpmc2800){
 148         .name                   = prpmc2800_platform_name,
 149         .probe                  = prpmc2800_probe,
 150         .setup_arch             = prpmc2800_setup_arch,
 151         .init_early             = mv64x60_init_early,
 152         .show_cpuinfo           = prpmc2800_show_cpuinfo,
 153         .init_IRQ               = mv64x60_init_irq,
 154         .get_irq                = mv64x60_get_irq,
 155         .restart                = prpmc2800_restart,
 156         .calibrate_decr         = generic_calibrate_decr,
 157 };