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 <asm/bootinfo.h>
  23 #include <asm/txx9/generic.h>
  24 #ifdef CONFIG_CPU_TX49XX
  25 #include <asm/txx9/tx4938.h>
  26 #endif
  27
  28 /* EBUSC settings of TX4927, etc. */
  29 struct resource txx9_ce_res[8];
  30 static char txx9_ce_res_name[8][4];     /* "CEn" */
  31
  32 /* pcode, internal register */
  33 char txx9_pcode_str[8];
  34 static struct resource txx9_reg_res = {
  35         .name = txx9_pcode_str,
  36         .flags = IORESOURCE_MEM,
  37 };
  38 void __init
  39 txx9_reg_res_init(unsigned int pcode, unsigned long base, unsigned long size)
  40 {
  41         int i;
  42
  43         for (i = 0; i < ARRAY_SIZE(txx9_ce_res); i++) {
  44                 sprintf(txx9_ce_res_name[i], "CE%d", i);
  45                 txx9_ce_res[i].flags = IORESOURCE_MEM;
  46                 txx9_ce_res[i].name = txx9_ce_res_name[i];
  47         }
  48
  49         sprintf(txx9_pcode_str, "TX%x", pcode);
  50         if (base) {
  51                 txx9_reg_res.start = base & 0xfffffffffULL;
  52                 txx9_reg_res.end = (base & 0xfffffffffULL) + (size - 1);
  53                 request_resource(&iomem_resource, &txx9_reg_res);
  54         }
  55 }
  56
  57 /* clocks */
  58 unsigned int txx9_master_clock;
  59 unsigned int txx9_cpu_clock;
  60 unsigned int txx9_gbus_clock;
  61
  62
  63 /* Minimum CLK support */
  64
  65 struct clk *clk_get(struct device *dev, const char *id)
  66 {
  67         if (!strcmp(id, "spi-baseclk"))
  68                 return (struct clk *)(txx9_gbus_clock / 2 / 4);
  69         if (!strcmp(id, "imbus_clk"))
  70                 return (struct clk *)(txx9_gbus_clock / 2);
  71         return ERR_PTR(-ENOENT);
  72 }
  73 EXPORT_SYMBOL(clk_get);
  74
  75 int clk_enable(struct clk *clk)
  76 {
  77         return 0;
  78 }
  79 EXPORT_SYMBOL(clk_enable);
  80
  81 void clk_disable(struct clk *clk)
  82 {
  83 }
  84 EXPORT_SYMBOL(clk_disable);
  85
  86 unsigned long clk_get_rate(struct clk *clk)
  87 {
  88         return (unsigned long)clk;
  89 }
  90 EXPORT_SYMBOL(clk_get_rate);
  91
  92 void clk_put(struct clk *clk)
  93 {
  94 }
  95 EXPORT_SYMBOL(clk_put);
  96
  97 /* GPIO support */
  98
  99 #ifdef CONFIG_GENERIC_GPIO
 100 int gpio_to_irq(unsigned gpio)
 101 {
 102         return -EINVAL;
 103 }
 104 EXPORT_SYMBOL(gpio_to_irq);
 105
 106 int irq_to_gpio(unsigned irq)
 107 {
 108         return -EINVAL;
 109 }
 110 EXPORT_SYMBOL(irq_to_gpio);
 111 #endif
 112
 113 extern struct txx9_board_vec jmr3927_vec;
 114 extern struct txx9_board_vec rbtx4927_vec;
 115 extern struct txx9_board_vec rbtx4937_vec;
 116 extern struct txx9_board_vec rbtx4938_vec;
 117
 118 struct txx9_board_vec *txx9_board_vec __initdata;
 119 static char txx9_system_type[32];
 120
 121 void __init prom_init_cmdline(void)
 122 {
 123         int argc = (int)fw_arg0;
 124         char **argv = (char **)fw_arg1;
 125         int i;                  /* Always ignore the "-c" at argv[0] */
 126
 127         /* ignore all built-in args if any f/w args given */
 128         if (argc > 1)
 129                 *arcs_cmdline = '\0';
 130
 131         for (i = 1; i < argc; i++) {
 132                 if (i != 1)
 133                         strcat(arcs_cmdline, " ");
 134                 strcat(arcs_cmdline, argv[i]);
 135         }
 136 }
 137
 138 void __init prom_init(void)
 139 {
 140 #ifdef CONFIG_CPU_TX39XX
 141         txx9_board_vec = &jmr3927_vec;
 142 #endif
 143 #ifdef CONFIG_CPU_TX49XX
 144         switch (TX4938_REV_PCODE()) {
 145 #ifdef CONFIG_TOSHIBA_RBTX4927
 146         case 0x4927:
 147                 txx9_board_vec = &rbtx4927_vec;
 148                 break;
 149         case 0x4937:
 150                 txx9_board_vec = &rbtx4937_vec;
 151                 break;
 152 #endif
 153 #ifdef CONFIG_TOSHIBA_RBTX4938
 154         case 0x4938:
 155                 txx9_board_vec = &rbtx4938_vec;
 156                 break;
 157 #endif
 158         }
 159 #endif
 160
 161         strcpy(txx9_system_type, txx9_board_vec->system);
 162
 163         txx9_board_vec->prom_init();
 164 }
 165
 166 void __init prom_free_prom_memory(void)
 167 {
 168 }
 169
 170 const char *get_system_type(void)
 171 {
 172         return txx9_system_type;
 173 }
 174
 175 char * __init prom_getcmdline(void)
 176 {
 177         return &(arcs_cmdline[0]);
 178 }
 179
 180 /* wrappers */
 181 void __init plat_mem_setup(void)
 182 {
 183         txx9_board_vec->mem_setup();
 184 }
 185
 186 void __init arch_init_irq(void)
 187 {
 188         txx9_board_vec->irq_setup();
 189 }
 190
 191 void __init plat_time_init(void)
 192 {
 193         txx9_board_vec->time_init();
 194 }
 195
 196 static int __init _txx9_arch_init(void)
 197 {
 198         if (txx9_board_vec->arch_init)
 199                 txx9_board_vec->arch_init();
 200         return 0;
 201 }
 202 arch_initcall(_txx9_arch_init);
 203
 204 static int __init _txx9_device_init(void)
 205 {
 206         if (txx9_board_vec->device_init)
 207                 txx9_board_vec->device_init();
 208         return 0;
 209 }
 210 device_initcall(_txx9_device_init);
 211
 212 int (*txx9_irq_dispatch)(int pending);
 213 asmlinkage void plat_irq_dispatch(void)
 214 {
 215         int pending = read_c0_status() & read_c0_cause() & ST0_IM;
 216         int irq = txx9_irq_dispatch(pending);
 217
 218         if (likely(irq >= 0))
 219                 do_IRQ(irq);
 220         else
 221                 spurious_interrupt();
 222 }
 223
 224 /* see include/asm-mips/mach-tx39xx/mangle-port.h, for example. */
 225 #ifdef NEEDS_TXX9_SWIZZLE_ADDR_B
 226 static unsigned long __swizzle_addr_none(unsigned long port)
 227 {
 228         return port;
 229 }
 230 unsigned long (*__swizzle_addr_b)(unsigned long port) = __swizzle_addr_none;
 231 EXPORT_SYMBOL(__swizzle_addr_b);
 232 #endif