target/linux/atheros/files/arch/mips/atheros/ar5315/board.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) 2003 Atheros Communications, Inc.,  All Rights Reserved.
   7  * Copyright (C) 2006 FON Technology, SL.
   8  * Copyright (C) 2006 Imre Kaloz <kaloz@openwrt.org>
   9  * Copyright (C) 2006 Felix Fietkau <nbd@openwrt.org>
  10  */
  11
  12 /*
  13  * Platform devices for Atheros SoCs
  14  */
  15
  16 #include <linux/autoconf.h>
  17 #include <linux/init.h>
  18 #include <linux/module.h>
  19 #include <linux/types.h>
  20 #include <linux/string.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/kernel.h>
  23 #include <linux/reboot.h>
  24 #include <asm/bootinfo.h>
  25 #include <asm/reboot.h>
  26 #include <asm/time.h>
  27 #include <asm/irq.h>
  28 #include <asm/io.h>
  29 #include <ar531x.h>
  30 #include <linux/leds.h>
  31 #include <asm/gpio.h>
  32
  33 static int is_5315 = 0;
  34
  35 static struct resource ar5315_eth_res[] = {
  36         {
  37                 .name = "eth0_membase",
  38                 .flags = IORESOURCE_MEM,
  39                 .start = AR5315_ENET0,
  40                 .end = AR5315_ENET0 + 0x2000,
  41         },
  42         {
  43                 .name = "eth0_irq",
  44                 .flags = IORESOURCE_IRQ,
  45                 .start = AR5315_IRQ_ENET0_INTRS,
  46                 .end = AR5315_IRQ_ENET0_INTRS,
  47         },
  48 };
  49
  50 static struct ar531x_eth ar5315_eth_data = {
  51         .phy = 1,
  52         .mac = 0,
  53         .reset_base = AR5315_RESET,
  54         .reset_mac = AR5315_RESET_ENET0,
  55         .reset_phy = AR5315_RESET_EPHY0,
  56         .phy_base = AR5315_ENET0
  57 };
  58
  59 static struct platform_device ar5315_eth = {
  60         .id = 0,
  61         .name = "ar531x-eth",
  62         .dev.platform_data = &ar5315_eth_data,
  63         .resource = ar5315_eth_res,
  64         .num_resources = ARRAY_SIZE(ar5315_eth_res)
  65 };
  66
  67 static struct platform_device ar5315_wmac = {
  68         .id = 0,
  69         .name = "ar531x-wmac",
  70         /* FIXME: add resources */
  71 };
  72
  73 static struct resource ar5315_spiflash_res[] = {
  74         {
  75                 .name = "flash_base",
  76                 .flags = IORESOURCE_MEM,
  77                 .start = KSEG1ADDR(AR5315_SPI_READ),
  78                 .end = KSEG1ADDR(AR5315_SPI_READ) + 0x800000,
  79         },
  80         {
  81                 .name = "flash_regs",
  82                 .flags = IORESOURCE_MEM,
  83                 .start = 0x11300000,
  84                 .end = 0x11300012,
  85         },
  86 };
  87
  88 static struct platform_device ar5315_spiflash = {
  89         .id = 0,
  90         .name = "spiflash",
  91         .resource = ar5315_spiflash_res,
  92         .num_resources = ARRAY_SIZE(ar5315_spiflash_res)
  93 };
  94
  95 #ifdef CONFIG_LEDS_GPIO
  96 static struct gpio_led ar5315_leds[8];
  97
  98 static struct gpio_led_platform_data ar5315_led_data = {
  99         .num_leds = ARRAY_SIZE(ar5315_leds),
 100         .leds = (void *) ar5315_leds,
 101 };
 102
 103 static struct platform_device ar5315_gpio_leds = {
 104         .name = "leds-gpio",
 105         .id = -1,
 106         .dev = {
 107                 .platform_data = (void *) &ar5315_led_data,
 108         }
 109 };
 110 #endif
 111
 112 static __initdata struct platform_device *ar5315_devs[5];
 113
 114 static void *flash_regs;
 115
 116 static inline __u32 spiflash_regread32(int reg)
 117 {
 118         volatile __u32 *data = (__u32 *)(flash_regs + reg);
 119
 120         return (*data);
 121 }
 122
 123 static inline void spiflash_regwrite32(int reg, __u32 data)
 124 {
 125         volatile __u32 *addr = (__u32 *)(flash_regs + reg);
 126
 127         *addr = data;
 128 }
 129
 130 #define SPI_FLASH_CTL      0x00
 131 #define SPI_FLASH_OPCODE   0x04
 132 #define SPI_FLASH_DATA     0x08
 133
 134 static __u8 spiflash_probe(void)
 135 {
 136          __u32 reg;
 137
 138         do {
 139                 reg = spiflash_regread32(SPI_FLASH_CTL);
 140         } while (reg & SPI_CTL_BUSY);
 141
 142         spiflash_regwrite32(SPI_FLASH_OPCODE, 0xab);
 143
 144         reg = (reg & ~SPI_CTL_TX_RX_CNT_MASK) | 4 |
 145                 (1 << 4) | SPI_CTL_START;
 146
 147         spiflash_regwrite32(SPI_FLASH_CTL, reg);
 148
 149         do {
 150                 reg = spiflash_regread32(SPI_FLASH_CTL);
 151         } while (reg & SPI_CTL_BUSY);
 152
 153         reg = (__u32) spiflash_regread32(SPI_FLASH_DATA);
 154         reg &= 0xff;
 155
 156         return (u8) reg;
 157 }
 158
 159
 160 #define STM_8MBIT_SIGNATURE     0x13
 161 #define STM_16MBIT_SIGNATURE    0x14
 162 #define STM_32MBIT_SIGNATURE    0x15
 163 #define STM_64MBIT_SIGNATURE    0x16
 164 #define STM_128MBIT_SIGNATURE   0x17
 165
 166
 167 static char __init *ar5315_flash_limit(void)
 168 {
 169         u8 sig;
 170         u32 flash_size = 0;
 171
 172         /* probe the flash chip size */
 173         flash_regs = ioremap_nocache(ar5315_spiflash_res[1].start, ar5315_spiflash_res[1].end - ar5315_spiflash_res[1].start);
 174         sig = spiflash_probe();
 175         iounmap(flash_regs);
 176
 177         switch(sig) {
 178                 case STM_8MBIT_SIGNATURE:
 179                         flash_size = 0x00100000;
 180                         break;
 181                 case STM_16MBIT_SIGNATURE:
 182                         flash_size = 0x00200000;
 183                         break;
 184                 case STM_32MBIT_SIGNATURE:
 185                         flash_size = 0x00400000;
 186                         break;
 187                 case STM_64MBIT_SIGNATURE:
 188                         flash_size = 0x00800000;
 189                         break;
 190                 case STM_128MBIT_SIGNATURE:
 191                         flash_size = 0x01000000;
 192                         break;
 193         }
 194
 195         ar5315_spiflash_res[0].end = ar5315_spiflash_res[0].start + flash_size;
 196         return (char *) ar5315_spiflash_res[0].end;
 197 }
 198
 199 int __init ar5315_init_devices(void)
 200 {
 201         struct ar531x_config *config;
 202         struct ar531x_boarddata *bcfg;
 203         int dev = 0;
 204 #ifdef CONFIG_LEDS_GPIO
 205         int i;
 206         char *tmp;
 207 #endif
 208
 209         if (!is_5315)
 210                 return 0;
 211
 212         /* Find board configuration */
 213         ar531x_find_config(ar5315_flash_limit());
 214         bcfg = (struct ar531x_boarddata *) board_config;
 215
 216 #if 0
 217         {
 218         /* Detect the hardware based on the device ID */
 219         u32 devid = sysRegRead(AR5315_SREV) & AR5315_REV_MAJ >> AR5315_REV_MAJ_S;
 220                 switch(devid) {
 221                 case 0x9:
 222                         mips_machtype = MACH_ATHEROS_AR2317;
 223                         break;
 224                 /* FIXME: how can we detect AR2316? */
 225                 case 0x8:
 226                 default:
 227                         mips_machtype = MACH_ATHEROS_AR2315;
 228                         break;
 229                 }
 230         }
 231 #endif
 232
 233         config = (struct ar531x_config *) kzalloc(sizeof(struct ar531x_config), GFP_KERNEL);
 234         config->board = board_config;
 235         config->radio = radio_config;
 236         config->unit = 0;
 237         config->tag = (u_int16_t) (sysRegRead(AR5315_SREV) & AR5315_REV_CHIP);
 238
 239         ar5315_eth_data.board_config = board_config;
 240         ar5315_eth_data.macaddr = bcfg->enet0Mac;
 241         ar5315_wmac.dev.platform_data = config;
 242
 243         ar5315_devs[dev++] = &ar5315_eth;
 244         ar5315_devs[dev++] = &ar5315_wmac;
 245         ar5315_devs[dev++] = &ar5315_spiflash;
 246
 247 #ifdef CONFIG_LEDS_GPIO
 248         ar5315_led_data.num_leds = 0;
 249         for(i = 0; i < 8; i++)
 250         {
 251                 if((i != AR5315_RESET_GPIO) && (i != bcfg->resetConfigGpio))
 252                 {
 253                         if(i == bcfg->sysLedGpio)
 254                         {
 255                                 tmp = kstrdup("wlan", GFP_KERNEL);
 256                         } else {
 257                                 tmp = kmalloc(6, GFP_KERNEL);
 258                                 if(tmp)
 259                                         sprintf((char*)tmp, "gpio%d", i);
 260                         }
 261                         if(tmp)
 262                         {
 263                                 ar5315_leds[ar5315_led_data.num_leds].name = tmp;
 264                                 ar5315_leds[ar5315_led_data.num_leds].gpio = i;
 265                                 ar5315_leds[ar5315_led_data.num_leds].active_low = 0;
 266                                 ar5315_led_data.num_leds++;
 267                         } else {
 268                                 printk("failed to alloc led string\n");
 269                                 continue;
 270                         }
 271                 }
 272         }
 273         ar5315_devs[dev++] = &ar5315_gpio_leds;
 274 #endif
 275
 276         return platform_add_devices(ar5315_devs, dev);
 277 }
 278
 279 static void ar5315_halt(void)
 280 {
 281          while (1);
 282 }
 283
 284 static void ar5315_power_off(void)
 285 {
 286          ar5315_halt();
 287 }
 288
 289
 290 static void ar5315_restart(char *command)
 291 {
 292         unsigned int reg;
 293         for(;;) {
 294                 /* reset the system */
 295                 sysRegWrite(AR5315_COLD_RESET,AR5317_RESET_SYSTEM);
 296
 297                 /*
 298                  * Cold reset does not work on the AR2315/6, use the GPIO reset bits a workaround.
 299                  */
 300                 gpio_direction_output(AR5315_RESET_GPIO, 0);
 301         }
 302 }
 303
 304
 305 /*
 306  * This table is indexed by bits 5..4 of the CLOCKCTL1 register
 307  * to determine the predevisor value.
 308  */
 309 static int __initdata CLOCKCTL1_PREDIVIDE_TABLE[4] = {
 310     1,
 311     2,
 312     4,
 313     5
 314 };
 315
 316 static int __initdata PLLC_DIVIDE_TABLE[5] = {
 317     2,
 318     3,
 319     4,
 320     6,
 321     3
 322 };
 323
 324 static unsigned int __init
 325 ar5315_sys_clk(unsigned int clockCtl)
 326 {
 327     unsigned int pllcCtrl,cpuDiv;
 328     unsigned int pllcOut,refdiv,fdiv,divby2;
 329         unsigned int clkDiv;
 330
 331     pllcCtrl = sysRegRead(AR5315_PLLC_CTL);
 332     refdiv = (pllcCtrl & PLLC_REF_DIV_M) >> PLLC_REF_DIV_S;
 333     refdiv = CLOCKCTL1_PREDIVIDE_TABLE[refdiv];
 334     fdiv = (pllcCtrl & PLLC_FDBACK_DIV_M) >> PLLC_FDBACK_DIV_S;
 335     divby2 = (pllcCtrl & PLLC_ADD_FDBACK_DIV_M) >> PLLC_ADD_FDBACK_DIV_S;
 336     divby2 += 1;
 337     pllcOut = (40000000/refdiv)*(2*divby2)*fdiv;
 338
 339
 340     /* clkm input selected */
 341         switch(clockCtl & CPUCLK_CLK_SEL_M) {
 342                 case 0:
 343                 case 1:
 344                         clkDiv = PLLC_DIVIDE_TABLE[(pllcCtrl & PLLC_CLKM_DIV_M) >> PLLC_CLKM_DIV_S];
 345                         break;
 346                 case 2:
 347                         clkDiv = PLLC_DIVIDE_TABLE[(pllcCtrl & PLLC_CLKC_DIV_M) >> PLLC_CLKC_DIV_S];
 348                         break;
 349                 default:
 350                         pllcOut = 40000000;
 351                         clkDiv = 1;
 352                         break;
 353         }
 354         cpuDiv = (clockCtl & CPUCLK_CLK_DIV_M) >> CPUCLK_CLK_DIV_S;
 355         cpuDiv = cpuDiv * 2 ?: 1;
 356         return (pllcOut/(clkDiv * cpuDiv));
 357 }
 358
 359 static inline unsigned int ar5315_cpu_frequency(void)
 360 {
 361     return ar5315_sys_clk(sysRegRead(AR5315_CPUCLK));
 362 }
 363
 364 static inline unsigned int ar5315_apb_frequency(void)
 365 {
 366     return ar5315_sys_clk(sysRegRead(AR5315_AMBACLK));
 367 }
 368
 369 static void __init ar5315_time_init(void)
 370 {
 371         mips_hpt_frequency = ar5315_cpu_frequency() / 2;
 372 }
 373
 374 void __init ar5315_prom_init(void)
 375 {
 376         u32 memsize, memcfg;
 377
 378         is_5315 = 1;
 379         memcfg = sysRegRead(AR5315_MEM_CFG);
 380         memsize   = 1 + ((memcfg & SDRAM_DATA_WIDTH_M) >> SDRAM_DATA_WIDTH_S);
 381         memsize <<= 1 + ((memcfg & SDRAM_COL_WIDTH_M) >> SDRAM_COL_WIDTH_S);
 382         memsize <<= 1 + ((memcfg & SDRAM_ROW_WIDTH_M) >> SDRAM_ROW_WIDTH_S);
 383         memsize <<= 3;
 384         add_memory_region(0, memsize, BOOT_MEM_RAM);
 385
 386         /* Initialize it to AR2315 for now. Real detection will be done
 387          * in ar5315_init_devices() */
 388         mips_machtype = MACH_ATHEROS_AR2315;
 389 }
 390
 391 void __init ar5315_plat_setup(void)
 392 {
 393         unsigned int config = read_c0_config();
 394
 395         /* Clear any lingering AHB errors */
 396         write_c0_config(config & ~0x3);
 397         sysRegWrite(AR5315_AHB_ERR0,AHB_ERROR_DET);
 398         sysRegRead(AR5315_AHB_ERR1);
 399         sysRegWrite(AR5315_WDC, WDC_IGNORE_EXPIRATION);
 400
 401         board_time_init = ar5315_time_init;
 402
 403         _machine_restart = ar5315_restart;
 404         _machine_halt = ar5315_halt;
 405         pm_power_off = ar5315_power_off;
 406
 407         serial_setup(KSEG1ADDR(AR5315_UART0), ar5315_apb_frequency());
 408 }
 409
 410 arch_initcall(ar5315_init_devices);