arch/mips/bcm63xx/setup.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
   7  */
   8
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/delay.h>
  12 #include <linux/memblock.h>
  13 #include <linux/ioport.h>
  14 #include <linux/pm.h>
  15 #include <asm/bmips.h>
  16 #include <asm/bootinfo.h>
  17 #include <asm/time.h>
  18 #include <asm/reboot.h>
  19 #include <asm/cacheflush.h>
  20 #include <bcm63xx_board.h>
  21 #include <bcm63xx_cpu.h>
  22 #include <bcm63xx_regs.h>
  23 #include <bcm63xx_io.h>
  24 #include <bcm63xx_gpio.h>
  25
  26 /*
  27  * CBR addr doesn't change and we can cache it.
  28  * For broken SoC/Bootloader CBR addr might also be provided via DT
  29  * with "brcm,bmips-cbr-reg" in the "cpus" node.
  30  */
  31 void __iomem *bmips_cbr_addr __read_mostly;
  32
  33 void bcm63xx_machine_halt(void)
  34 {
  35         pr_info("System halted\n");
  36         while (1)
  37                 ;
  38 }
  39
  40 static void bcm6348_a1_reboot(void)
  41 {
  42         u32 reg;
  43
  44         /* soft reset all blocks */
  45         pr_info("soft-resetting all blocks ...\n");
  46         reg = bcm_perf_readl(PERF_SOFTRESET_REG);
  47         reg &= ~SOFTRESET_6348_ALL;
  48         bcm_perf_writel(reg, PERF_SOFTRESET_REG);
  49         mdelay(10);
  50
  51         reg = bcm_perf_readl(PERF_SOFTRESET_REG);
  52         reg |= SOFTRESET_6348_ALL;
  53         bcm_perf_writel(reg, PERF_SOFTRESET_REG);
  54         mdelay(10);
  55
  56         /* Jump to the power on address. */
  57         pr_info("jumping to reset vector.\n");
  58         /* set high vectors (base at 0xbfc00000 */
  59         set_c0_status(ST0_BEV | ST0_ERL);
  60         /* run uncached in kseg0 */
  61         change_c0_config(CONF_CM_CMASK, CONF_CM_UNCACHED);
  62         __flush_cache_all();
  63         /* remove all wired TLB entries */
  64         write_c0_wired(0);
  65         __asm__ __volatile__(
  66                 "jr\t%0"
  67                 :
  68                 : "r" (0xbfc00000));
  69         while (1)
  70                 ;
  71 }
  72
  73 void bcm63xx_machine_reboot(void)
  74 {
  75         u32 reg, perf_regs[2] = { 0, 0 };
  76         unsigned int i;
  77
  78         /* mask and clear all external irq */
  79         switch (bcm63xx_get_cpu_id()) {
  80         case BCM3368_CPU_ID:
  81                 perf_regs[0] = PERF_EXTIRQ_CFG_REG_3368;
  82                 break;
  83         case BCM6328_CPU_ID:
  84                 perf_regs[0] = PERF_EXTIRQ_CFG_REG_6328;
  85                 break;
  86         case BCM6338_CPU_ID:
  87                 perf_regs[0] = PERF_EXTIRQ_CFG_REG_6338;
  88                 break;
  89         case BCM6345_CPU_ID:
  90                 perf_regs[0] = PERF_EXTIRQ_CFG_REG_6345;
  91                 break;
  92         case BCM6348_CPU_ID:
  93                 perf_regs[0] = PERF_EXTIRQ_CFG_REG_6348;
  94                 break;
  95         case BCM6358_CPU_ID:
  96                 perf_regs[0] = PERF_EXTIRQ_CFG_REG_6358;
  97                 break;
  98         case BCM6362_CPU_ID:
  99                 perf_regs[0] = PERF_EXTIRQ_CFG_REG_6362;
 100                 break;
 101         }
 102
 103         for (i = 0; i < 2; i++) {
 104                 if (!perf_regs[i])
 105                         break;
 106
 107                 reg = bcm_perf_readl(perf_regs[i]);
 108                 if (BCMCPU_IS_6348()) {
 109                         reg &= ~EXTIRQ_CFG_MASK_ALL_6348;
 110                         reg |= EXTIRQ_CFG_CLEAR_ALL_6348;
 111                 } else {
 112                         reg &= ~EXTIRQ_CFG_MASK_ALL;
 113                         reg |= EXTIRQ_CFG_CLEAR_ALL;
 114                 }
 115                 bcm_perf_writel(reg, perf_regs[i]);
 116         }
 117
 118         if (BCMCPU_IS_6348() && (bcm63xx_get_cpu_rev() == 0xa1))
 119                 bcm6348_a1_reboot();
 120
 121         pr_info("triggering watchdog soft-reset...\n");
 122         if (BCMCPU_IS_6328()) {
 123                 bcm_wdt_writel(1, WDT_SOFTRESET_REG);
 124         } else {
 125                 reg = bcm_perf_readl(PERF_SYS_PLL_CTL_REG);
 126                 reg |= SYS_PLL_SOFT_RESET;
 127                 bcm_perf_writel(reg, PERF_SYS_PLL_CTL_REG);
 128         }
 129         while (1)
 130                 ;
 131 }
 132
 133 static void __bcm63xx_machine_reboot(char *p)
 134 {
 135         bcm63xx_machine_reboot();
 136 }
 137
 138 /*
 139  * return system type in /proc/cpuinfo
 140  */
 141 const char *get_system_type(void)
 142 {
 143         static char buf[128];
 144         snprintf(buf, sizeof(buf), "bcm63xx/%s (0x%04x/0x%02X)",
 145                  board_get_name(),
 146                  bcm63xx_get_cpu_id(), bcm63xx_get_cpu_rev());
 147         return buf;
 148 }
 149
 150 void __init plat_time_init(void)
 151 {
 152         mips_hpt_frequency = bcm63xx_get_cpu_freq() / 2;
 153 }
 154
 155 void __init plat_mem_setup(void)
 156 {
 157         memblock_add(0, bcm63xx_get_memory_size());
 158
 159         _machine_halt = bcm63xx_machine_halt;
 160         _machine_restart = __bcm63xx_machine_reboot;
 161         pm_power_off = bcm63xx_machine_halt;
 162
 163         set_io_port_base(0);
 164         ioport_resource.start = 0;
 165         ioport_resource.end = ~0;
 166
 167         board_setup();
 168 }
 169
 170 static int __init bcm63xx_register_devices(void)
 171 {
 172         /* register gpiochip */
 173         bcm63xx_gpio_init();
 174
 175         return board_register_devices();
 176 }
 177
 178 arch_initcall(bcm63xx_register_devices);