arch/mips/txx9/generic/setup.c

   1 /*
   2  * linux/arch/mips/txx9/generic/setup.c
   3  *
   4  * Based on linux/arch/mips/txx9/rbtx4938/setup.c,
   5  *          and RBTX49xx patch from CELF patch archive.
   6  *
   7  * 2003-2005 (c) MontaVista Software, Inc.
   8  * (C) Copyright TOSHIBA CORPORATION 2000-2001, 2004-2007
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file "COPYING" in the main directory of this archive
  12  * for more details.
  13  */
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/types.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/string.h>
  19 #include <linux/module.h>
  20 #include <linux/clk.h>
  21 #include <linux/err.h>
  22 #include <linux/gpio.h>
  23 #include <asm/bootinfo.h>
  24 #include <asm/time.h>
  25 #include <asm/reboot.h>
  26 #include <asm/txx9/generic.h>
  27 #include <asm/txx9/pci.h>
  28 #ifdef CONFIG_CPU_TX49XX
  29 #include <asm/txx9/tx4938.h>
  30 #endif
  31
  32 /* EBUSC settings of TX4927, etc. */
  33 struct resource txx9_ce_res[8];
  34 static char txx9_ce_res_name[8][4];     /* "CEn" */
  35
  36 /* pcode, internal register */
  37 unsigned int txx9_pcode;
  38 char txx9_pcode_str[8];
  39 static struct resource txx9_reg_res = {
  40         .name = txx9_pcode_str,
  41         .flags = IORESOURCE_MEM,
  42 };
  43 void __init
  44 txx9_reg_res_init(unsigned int pcode, unsigned long base, unsigned long size)
  45 {
  46         int i;
  47
  48         for (i = 0; i < ARRAY_SIZE(txx9_ce_res); i++) {
  49                 sprintf(txx9_ce_res_name[i], "CE%d", i);
  50                 txx9_ce_res[i].flags = IORESOURCE_MEM;
  51                 txx9_ce_res[i].name = txx9_ce_res_name[i];
  52         }
  53
  54         sprintf(txx9_pcode_str, "TX%x", pcode);
  55         if (base) {
  56                 txx9_reg_res.start = base & 0xfffffffffULL;
  57                 txx9_reg_res.end = (base & 0xfffffffffULL) + (size - 1);
  58                 request_resource(&iomem_resource, &txx9_reg_res);
  59         }
  60 }
  61
  62 /* clocks */
  63 unsigned int txx9_master_clock;
  64 unsigned int txx9_cpu_clock;
  65 unsigned int txx9_gbus_clock;
  66
  67 int txx9_ccfg_toeon __initdata = 1;
  68
  69 /* Minimum CLK support */
  70
  71 struct clk *clk_get(struct device *dev, const char *id)
  72 {
  73         if (!strcmp(id, "spi-baseclk"))
  74                 return (struct clk *)((unsigned long)txx9_gbus_clock / 2 / 4);
  75         if (!strcmp(id, "imbus_clk"))
  76                 return (struct clk *)((unsigned long)txx9_gbus_clock / 2);
  77         return ERR_PTR(-ENOENT);
  78 }
  79 EXPORT_SYMBOL(clk_get);
  80
  81 int clk_enable(struct clk *clk)
  82 {
  83         return 0;
  84 }
  85 EXPORT_SYMBOL(clk_enable);
  86
  87 void clk_disable(struct clk *clk)
  88 {
  89 }
  90 EXPORT_SYMBOL(clk_disable);
  91
  92 unsigned long clk_get_rate(struct clk *clk)
  93 {
  94         return (unsigned long)clk;
  95 }
  96 EXPORT_SYMBOL(clk_get_rate);
  97
  98 void clk_put(struct clk *clk)
  99 {
 100 }
 101 EXPORT_SYMBOL(clk_put);
 102
 103 /* GPIO support */
 104
 105 #ifdef CONFIG_GENERIC_GPIO
 106 int gpio_to_irq(unsigned gpio)
 107 {
 108         return -EINVAL;
 109 }
 110 EXPORT_SYMBOL(gpio_to_irq);
 111
 112 int irq_to_gpio(unsigned irq)
 113 {
 114         return -EINVAL;
 115 }
 116 EXPORT_SYMBOL(irq_to_gpio);
 117 #endif
 118
 119 extern struct txx9_board_vec jmr3927_vec;
 120 extern struct txx9_board_vec rbtx4927_vec;
 121 extern struct txx9_board_vec rbtx4937_vec;
 122 extern struct txx9_board_vec rbtx4938_vec;
 123
 124 struct txx9_board_vec *txx9_board_vec __initdata;
 125 static char txx9_system_type[32];
 126
 127 void __init prom_init_cmdline(void)
 128 {
 129         int argc = (int)fw_arg0;
 130         char **argv = (char **)fw_arg1;
 131         int i;                  /* Always ignore the "-c" at argv[0] */
 132 #ifdef CONFIG_64BIT
 133         char *fixed_argv[32];
 134         for (i = 0; i < argc; i++)
 135                 fixed_argv[i] = (char *)(long)(*((__s32 *)argv + i));
 136         argv = fixed_argv;
 137 #endif
 138
 139         /* ignore all built-in args if any f/w args given */
 140         if (argc > 1)
 141                 *arcs_cmdline = '\0';
 142
 143         for (i = 1; i < argc; i++) {
 144                 if (i != 1)
 145                         strcat(arcs_cmdline, " ");
 146                 strcat(arcs_cmdline, argv[i]);
 147         }
 148 }
 149
 150 void __init prom_init(void)
 151 {
 152 #ifdef CONFIG_CPU_TX39XX
 153         txx9_board_vec = &jmr3927_vec;
 154 #endif
 155 #ifdef CONFIG_CPU_TX49XX
 156         switch (TX4938_REV_PCODE()) {
 157 #ifdef CONFIG_TOSHIBA_RBTX4927
 158         case 0x4927:
 159                 txx9_board_vec = &rbtx4927_vec;
 160                 break;
 161         case 0x4937:
 162                 txx9_board_vec = &rbtx4937_vec;
 163                 break;
 164 #endif
 165 #ifdef CONFIG_TOSHIBA_RBTX4938
 166         case 0x4938:
 167                 txx9_board_vec = &rbtx4938_vec;
 168                 break;
 169 #endif
 170         }
 171 #endif
 172
 173         strcpy(txx9_system_type, txx9_board_vec->system);
 174
 175         txx9_board_vec->prom_init();
 176 }
 177
 178 void __init prom_free_prom_memory(void)
 179 {
 180 }
 181
 182 const char *get_system_type(void)
 183 {
 184         return txx9_system_type;
 185 }
 186
 187 char * __init prom_getcmdline(void)
 188 {
 189         return &(arcs_cmdline[0]);
 190 }
 191
 192 static void __noreturn txx9_machine_halt(void)
 193 {
 194         local_irq_disable();
 195         clear_c0_status(ST0_IM);
 196         while (1) {
 197                 if (cpu_wait) {
 198                         (*cpu_wait)();
 199                         if (cpu_has_counter) {
 200                                 /*
 201                                  * Clear counter interrupt while it
 202                                  * breaks WAIT instruction even if
 203                                  * masked.
 204                                  */
 205                                 write_c0_compare(0);
 206                         }
 207                 }
 208         }
 209 }
 210
 211 /* wrappers */
 212 void __init plat_mem_setup(void)
 213 {
 214         ioport_resource.start = 0;
 215         ioport_resource.end = ~0UL;     /* no limit */
 216         iomem_resource.start = 0;
 217         iomem_resource.end = ~0UL;      /* no limit */
 218
 219         /* fallback restart/halt routines */
 220         _machine_restart = (void (*)(char *))txx9_machine_halt;
 221         _machine_halt = txx9_machine_halt;
 222         pm_power_off = txx9_machine_halt;
 223
 224 #ifdef CONFIG_PCI
 225         pcibios_plat_setup = txx9_pcibios_setup;
 226 #endif
 227         txx9_board_vec->mem_setup();
 228 }
 229
 230 void __init arch_init_irq(void)
 231 {
 232         txx9_board_vec->irq_setup();
 233 }
 234
 235 void __init plat_time_init(void)
 236 {
 237         txx9_board_vec->time_init();
 238 }
 239
 240 static int __init _txx9_arch_init(void)
 241 {
 242         if (txx9_board_vec->arch_init)
 243                 txx9_board_vec->arch_init();
 244         return 0;
 245 }
 246 arch_initcall(_txx9_arch_init);
 247
 248 static int __init _txx9_device_init(void)
 249 {
 250         if (txx9_board_vec->device_init)
 251                 txx9_board_vec->device_init();
 252         return 0;
 253 }
 254 device_initcall(_txx9_device_init);
 255
 256 int (*txx9_irq_dispatch)(int pending);
 257 asmlinkage void plat_irq_dispatch(void)
 258 {
 259         int pending = read_c0_status() & read_c0_cause() & ST0_IM;
 260         int irq = txx9_irq_dispatch(pending);
 261
 262         if (likely(irq >= 0))
 263                 do_IRQ(irq);
 264         else
 265                 spurious_interrupt();
 266 }
 267
 268 /* see include/asm-mips/mach-tx39xx/mangle-port.h, for example. */
 269 #ifdef NEEDS_TXX9_SWIZZLE_ADDR_B
 270 static unsigned long __swizzle_addr_none(unsigned long port)
 271 {
 272         return port;
 273 }
 274 unsigned long (*__swizzle_addr_b)(unsigned long port) = __swizzle_addr_none;
 275 EXPORT_SYMBOL(__swizzle_addr_b);
 276 #endif