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
  31 static int is_5315 = 0;
  32
  33 static struct resource ar5315_eth_res[] = {
  34         {
  35                 .name = "eth0_membase",
  36                 .flags = IORESOURCE_MEM,
  37                 .start = AR5315_ENET0,
  38                 .end = AR5315_ENET0 + 0x2000,
  39         },
  40         {
  41                 .name = "eth0_irq",
  42                 .flags = IORESOURCE_IRQ,
  43                 .start = AR5315_IRQ_ENET0_INTRS,
  44                 .end = AR5315_IRQ_ENET0_INTRS,
  45         },
  46 };
  47
  48 static struct ar531x_eth ar5315_eth_data = {
  49         .phy = 1,
  50         .mac = 0,
  51         .reset_base = AR5315_RESET,
  52         .reset_mac = AR5315_RESET_ENET0,
  53         .reset_phy = AR5315_RESET_EPHY0,
  54         .phy_base = AR5315_ENET0
  55 };
  56
  57 static struct platform_device ar5315_eth = {
  58         .id = 0,
  59         .name = "ar531x-eth",
  60         .dev.platform_data = &ar5315_eth_data,
  61         .resource = ar5315_eth_res,
  62         .num_resources = ARRAY_SIZE(ar5315_eth_res)
  63 };
  64
  65 static struct platform_device ar5315_wmac = {
  66         .id = 0,
  67         .name = "ar531x-wmac",
  68         /* FIXME: add resources */
  69 };
  70
  71 static struct resource ar5315_spiflash_res[] = {
  72         {
  73                 .name = "flash_base",
  74                 .flags = IORESOURCE_MEM,
  75                 .start = KSEG1ADDR(AR5315_SPI_READ),
  76                 .end = KSEG1ADDR(AR5315_SPI_READ) + 0x800000,
  77         },
  78         {
  79                 .name = "flash_regs",
  80                 .flags = IORESOURCE_MEM,
  81                 .start = 0x11300000,
  82                 .end = 0x11300012,
  83         },
  84 };
  85
  86 static struct platform_device ar5315_spiflash = {
  87         .id = 0,
  88         .name = "spiflash",
  89         .resource = ar5315_spiflash_res,
  90         .num_resources = ARRAY_SIZE(ar5315_spiflash_res)
  91 };
  92
  93 static __initdata struct platform_device *ar5315_devs[4];
  94
  95
  96
  97 static void *flash_regs;
  98
  99 static inline __u32 spiflash_regread32(int reg)
 100 {
 101         volatile __u32 *data = (__u32 *)(flash_regs + reg);
 102
 103         return (*data);
 104 }
 105
 106 static inline void spiflash_regwrite32(int reg, __u32 data)
 107 {
 108         volatile __u32 *addr = (__u32 *)(flash_regs + reg);
 109
 110         *addr = data;
 111 }
 112
 113 #define SPI_FLASH_CTL      0x00
 114 #define SPI_FLASH_OPCODE   0x04
 115 #define SPI_FLASH_DATA     0x08
 116
 117 static __u8 spiflash_probe(void)
 118 {
 119          __u32 reg;
 120
 121         do {
 122                 reg = spiflash_regread32(SPI_FLASH_CTL);
 123         } while (reg & SPI_CTL_BUSY);
 124
 125         spiflash_regwrite32(SPI_FLASH_OPCODE, 0xab);
 126
 127         reg = (reg & ~SPI_CTL_TX_RX_CNT_MASK) | 4 |
 128                 (1 << 4) | SPI_CTL_START;
 129
 130         spiflash_regwrite32(SPI_FLASH_CTL, reg);
 131
 132         do {
 133                 reg = spiflash_regread32(SPI_FLASH_CTL);
 134         } while (reg & SPI_CTL_BUSY);
 135
 136         reg = (__u32) spiflash_regread32(SPI_FLASH_DATA);
 137         reg &= 0xff;
 138
 139         return (u8) reg;
 140 }
 141
 142
 143 #define STM_8MBIT_SIGNATURE     0x13
 144 #define STM_16MBIT_SIGNATURE    0x14
 145 #define STM_32MBIT_SIGNATURE    0x15
 146 #define STM_64MBIT_SIGNATURE    0x16
 147 #define STM_128MBIT_SIGNATURE   0x17
 148
 149
 150 static char __init *ar5315_flash_limit(void)
 151 {
 152         u8 sig;
 153         u32 flash_size = 0;
 154
 155         /* probe the flash chip size */
 156         flash_regs = ioremap_nocache(ar5315_spiflash_res[1].start, ar5315_spiflash_res[1].end - ar5315_spiflash_res[1].start);
 157         sig = spiflash_probe();
 158         iounmap(flash_regs);
 159
 160         switch(sig) {
 161                 case STM_8MBIT_SIGNATURE:
 162                         flash_size = 0x00100000;
 163                         break;
 164                 case STM_16MBIT_SIGNATURE:
 165                         flash_size = 0x00200000;
 166                         break;
 167                 case STM_32MBIT_SIGNATURE:
 168                         flash_size = 0x00400000;
 169                         break;
 170                 case STM_64MBIT_SIGNATURE:
 171                         flash_size = 0x00800000;
 172                         break;
 173                 case STM_128MBIT_SIGNATURE:
 174                         flash_size = 0x01000000;
 175                         break;
 176         }
 177
 178         ar5315_spiflash_res[0].end = ar5315_spiflash_res[0].start + flash_size;
 179         return (char *) ar5315_spiflash_res[0].end;
 180 }
 181
 182 int __init ar5315_init_devices(void)
 183 {
 184         struct ar531x_config *config;
 185         struct ar531x_boarddata *bcfg;
 186         int dev = 0;
 187
 188         if (!is_5315)
 189                 return 0;
 190
 191         /* Find board configuration */
 192         ar531x_find_config(ar5315_flash_limit());
 193         bcfg = (struct ar531x_boarddata *) board_config;
 194
 195 #if 0
 196         {
 197         /* Detect the hardware based on the device ID */
 198         u32 devid = sysRegRead(AR5315_SREV) & AR5315_REV_MAJ >> AR5315_REV_MAJ_S;
 199                 switch(devid) {
 200                 case 0x9:
 201                         mips_machtype = MACH_ATHEROS_AR2317;
 202                         break;
 203                 /* FIXME: how can we detect AR2316? */
 204                 case 0x8:
 205                 default:
 206                         mips_machtype = MACH_ATHEROS_AR2315;
 207                         break;
 208                 }
 209         }
 210 #endif
 211
 212         config = (struct ar531x_config *) kzalloc(sizeof(struct ar531x_config), GFP_KERNEL);
 213         config->board = board_config;
 214         config->radio = radio_config;
 215         config->unit = 0;
 216         config->tag = (u_int16_t) (sysRegRead(AR5315_SREV) & AR5315_REV_CHIP);
 217
 218         ar5315_eth_data.board_config = board_config;
 219         ar5315_eth_data.macaddr = bcfg->enet0Mac;
 220         ar5315_wmac.dev.platform_data = config;
 221
 222         ar5315_devs[dev++] = &ar5315_eth;
 223         ar5315_devs[dev++] = &ar5315_wmac;
 224         ar5315_devs[dev++] = &ar5315_spiflash;
 225
 226
 227         return platform_add_devices(ar5315_devs, dev);
 228 }
 229
 230 static void ar5315_halt(void)
 231 {
 232          while (1);
 233 }
 234
 235 static void ar5315_power_off(void)
 236 {
 237          ar5315_halt();
 238 }
 239
 240
 241 static void ar5315_restart(char *command)
 242 {
 243         unsigned int reg;
 244         for(;;) {
 245
 246                 /* reset the system */
 247                 sysRegWrite(AR5315_COLD_RESET,AR5317_RESET_SYSTEM);
 248
 249                 /*
 250                  * Cold reset does not work on the AR2315/6, use the GPIO reset bits a workaround.
 251                  */
 252
 253                 reg = sysRegRead(AR5315_GPIO_DO);
 254                 reg &= ~(1 << AR5315_RESET_GPIO);
 255                 sysRegWrite(AR5315_GPIO_DO, reg);
 256                 (void)sysRegRead(AR5315_GPIO_DO); /* flush write to hardware */
 257         }
 258 }
 259
 260
 261 /*
 262  * This table is indexed by bits 5..4 of the CLOCKCTL1 register
 263  * to determine the predevisor value.
 264  */
 265 static int __initdata CLOCKCTL1_PREDIVIDE_TABLE[4] = {
 266     1,
 267     2,
 268     4,
 269     5
 270 };
 271
 272 static int __initdata PLLC_DIVIDE_TABLE[5] = {
 273     2,
 274     3,
 275     4,
 276     6,
 277     3
 278 };
 279
 280 static unsigned int __init
 281 ar5315_sys_clk(unsigned int clockCtl)
 282 {
 283     unsigned int pllcCtrl,cpuDiv;
 284     unsigned int pllcOut,refdiv,fdiv,divby2;
 285         unsigned int clkDiv;
 286
 287     pllcCtrl = sysRegRead(AR5315_PLLC_CTL);
 288     refdiv = (pllcCtrl & PLLC_REF_DIV_M) >> PLLC_REF_DIV_S;
 289     refdiv = CLOCKCTL1_PREDIVIDE_TABLE[refdiv];
 290     fdiv = (pllcCtrl & PLLC_FDBACK_DIV_M) >> PLLC_FDBACK_DIV_S;
 291     divby2 = (pllcCtrl & PLLC_ADD_FDBACK_DIV_M) >> PLLC_ADD_FDBACK_DIV_S;
 292     divby2 += 1;
 293     pllcOut = (40000000/refdiv)*(2*divby2)*fdiv;
 294
 295
 296     /* clkm input selected */
 297         switch(clockCtl & CPUCLK_CLK_SEL_M) {
 298                 case 0:
 299                 case 1:
 300                         clkDiv = PLLC_DIVIDE_TABLE[(pllcCtrl & PLLC_CLKM_DIV_M) >> PLLC_CLKM_DIV_S];
 301                         break;
 302                 case 2:
 303                         clkDiv = PLLC_DIVIDE_TABLE[(pllcCtrl & PLLC_CLKC_DIV_M) >> PLLC_CLKC_DIV_S];
 304                         break;
 305                 default:
 306                         pllcOut = 40000000;
 307                         clkDiv = 1;
 308                         break;
 309         }
 310         cpuDiv = (clockCtl & CPUCLK_CLK_DIV_M) >> CPUCLK_CLK_DIV_S;
 311         cpuDiv = cpuDiv * 2 ?: 1;
 312         return (pllcOut/(clkDiv * cpuDiv));
 313 }
 314
 315 static inline unsigned int ar5315_cpu_frequency(void)
 316 {
 317     return ar5315_sys_clk(sysRegRead(AR5315_CPUCLK));
 318 }
 319
 320 static inline unsigned int ar5315_apb_frequency(void)
 321 {
 322     return ar5315_sys_clk(sysRegRead(AR5315_AMBACLK));
 323 }
 324
 325 static void __init ar5315_time_init(void)
 326 {
 327         mips_hpt_frequency = ar5315_cpu_frequency() / 2;
 328 }
 329
 330 void __init ar5315_prom_init(void)
 331 {
 332         u32 memsize, memcfg;
 333
 334         is_5315 = 1;
 335         memcfg = sysRegRead(AR5315_MEM_CFG);
 336         memsize   = 1 + ((memcfg & SDRAM_DATA_WIDTH_M) >> SDRAM_DATA_WIDTH_S);
 337         memsize <<= 1 + ((memcfg & SDRAM_COL_WIDTH_M) >> SDRAM_COL_WIDTH_S);
 338         memsize <<= 1 + ((memcfg & SDRAM_ROW_WIDTH_M) >> SDRAM_ROW_WIDTH_S);
 339         memsize <<= 3;
 340         add_memory_region(0, memsize, BOOT_MEM_RAM);
 341
 342         /* Initialize it to AR2315 for now. Real detection will be done
 343          * in ar5315_init_devices() */
 344         mips_machtype = MACH_ATHEROS_AR2315;
 345 }
 346
 347 void __init ar5315_plat_setup(void)
 348 {
 349         unsigned int config = read_c0_config();
 350
 351         /* Clear any lingering AHB errors */
 352         write_c0_config(config & ~0x3);
 353         sysRegWrite(AR5315_AHB_ERR0,AHB_ERROR_DET);
 354         sysRegRead(AR5315_AHB_ERR1);
 355         sysRegWrite(AR5315_WDC, WDC_IGNORE_EXPIRATION);
 356
 357         board_time_init = ar5315_time_init;
 358
 359         _machine_restart = ar5315_restart;
 360         _machine_halt = ar5315_halt;
 361         pm_power_off = ar5315_power_off;
 362
 363         serial_setup(KSEG1ADDR(AR5315_UART0), ar5315_apb_frequency());
 364 }
 365
 366 arch_initcall(ar5315_init_devices);