board/ti/am335x/board.c

   1 /*
   2  * board.c
   3  *
   4  * Board functions for TI AM335X based boards
   5  *
   6  * Copyright (C) 2011, Texas Instruments, Incorporated - http://www.ti.com/
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR /PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  */
  18
  19 #include <common.h>
  20 #include <errno.h>
  21 #include <spl.h>
  22 #include <asm/arch/cpu.h>
  23 #include <asm/arch/hardware.h>
  24 #include <asm/arch/omap.h>
  25 #include <asm/arch/ddr_defs.h>
  26 #include <asm/arch/clock.h>
  27 #include <asm/arch/gpio.h>
  28 #include <asm/arch/mmc_host_def.h>
  29 #include <asm/arch/sys_proto.h>
  30 #include <asm/io.h>
  31 #include <asm/emif.h>
  32 #include <asm/gpio.h>
  33 #include <i2c.h>
  34 #include <miiphy.h>
  35 #include <cpsw.h>
  36 #include "board.h"
  37
  38 DECLARE_GLOBAL_DATA_PTR;
  39
  40 static struct wd_timer *wdtimer = (struct wd_timer *)WDT_BASE;
  41 #ifdef CONFIG_SPL_BUILD
  42 static struct uart_sys *uart_base = (struct uart_sys *)DEFAULT_UART_BASE;
  43 #endif
  44
  45 /* MII mode defines */
  46 #define MII_MODE_ENABLE         0x0
  47 #define RGMII_MODE_ENABLE       0xA
  48
  49 /* GPIO that controls power to DDR on EVM-SK */
  50 #define GPIO_DDR_VTT_EN         7
  51
  52 static struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;
  53
  54 static struct am335x_baseboard_id __attribute__((section (".data"))) header;
  55
  56 static inline int board_is_bone(void)
  57 {
  58         return !strncmp(header.name, "A335BONE", HDR_NAME_LEN);
  59 }
  60
  61 static inline int board_is_bone_lt(void)
  62 {
  63         return !strncmp(header.name, "A335BNLT", HDR_NAME_LEN);
  64 }
  65
  66 static inline int board_is_evm_sk(void)
  67 {
  68         return !strncmp("A335X_SK", header.name, HDR_NAME_LEN);
  69 }
  70
  71 static inline int board_is_idk(void)
  72 {
  73         return !strncmp(header.config, "SKU#02", 6);
  74 }
  75
  76 /*
  77  * Read header information from EEPROM into global structure.
  78  */
  79 static int read_eeprom(void)
  80 {
  81         /* Check if baseboard eeprom is available */
  82         if (i2c_probe(CONFIG_SYS_I2C_EEPROM_ADDR)) {
  83                 puts("Could not probe the EEPROM; something fundamentally "
  84                         "wrong on the I2C bus.\n");
  85                 return -ENODEV;
  86         }
  87
  88         /* read the eeprom using i2c */
  89         if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 2, (uchar *)&header,
  90                                                         sizeof(header))) {
  91                 puts("Could not read the EEPROM; something fundamentally"
  92                         " wrong on the I2C bus.\n");
  93                 return -EIO;
  94         }
  95
  96         if (header.magic != 0xEE3355AA) {
  97                 /*
  98                  * read the eeprom using i2c again,
  99                  * but use only a 1 byte address
 100                  */
 101                 if (i2c_read(CONFIG_SYS_I2C_EEPROM_ADDR, 0, 1,
 102                                         (uchar *)&header, sizeof(header))) {
 103                         puts("Could not read the EEPROM; something "
 104                                 "fundamentally wrong on the I2C bus.\n");
 105                         return -EIO;
 106                 }
 107
 108                 if (header.magic != 0xEE3355AA) {
 109                         printf("Incorrect magic number (0x%x) in EEPROM\n",
 110                                         header.magic);
 111                         return -EINVAL;
 112                 }
 113         }
 114
 115         return 0;
 116 }
 117
 118 /* UART Defines */
 119 #ifdef CONFIG_SPL_BUILD
 120 #define UART_RESET              (0x1 << 1)
 121 #define UART_CLK_RUNNING_MASK   0x1
 122 #define UART_SMART_IDLE_EN      (0x1 << 0x3)
 123
 124 static void rtc32k_enable(void)
 125 {
 126         struct rtc_regs *rtc = (struct rtc_regs *)AM335X_RTC_BASE;
 127
 128         /*
 129          * Unlock the RTC's registers.  For more details please see the
 130          * RTC_SS section of the TRM.  In order to unlock we need to
 131          * write these specific values (keys) in this order.
 132          */
 133         writel(0x83e70b13, &rtc->kick0r);
 134         writel(0x95a4f1e0, &rtc->kick1r);
 135
 136         /* Enable the RTC 32K OSC by setting bits 3 and 6. */
 137         writel((1 << 3) | (1 << 6), &rtc->osc);
 138 }
 139
 140 static const struct ddr_data ddr2_data = {
 141         .datardsratio0 = ((MT47H128M16RT25E_RD_DQS<<30) |
 142                           (MT47H128M16RT25E_RD_DQS<<20) |
 143                           (MT47H128M16RT25E_RD_DQS<<10) |
 144                           (MT47H128M16RT25E_RD_DQS<<0)),
 145         .datawdsratio0 = ((MT47H128M16RT25E_WR_DQS<<30) |
 146                           (MT47H128M16RT25E_WR_DQS<<20) |
 147                           (MT47H128M16RT25E_WR_DQS<<10) |
 148                           (MT47H128M16RT25E_WR_DQS<<0)),
 149         .datawiratio0 = ((MT47H128M16RT25E_PHY_WRLVL<<30) |
 150                          (MT47H128M16RT25E_PHY_WRLVL<<20) |
 151                          (MT47H128M16RT25E_PHY_WRLVL<<10) |
 152                          (MT47H128M16RT25E_PHY_WRLVL<<0)),
 153         .datagiratio0 = ((MT47H128M16RT25E_PHY_GATELVL<<30) |
 154                          (MT47H128M16RT25E_PHY_GATELVL<<20) |
 155                          (MT47H128M16RT25E_PHY_GATELVL<<10) |
 156                          (MT47H128M16RT25E_PHY_GATELVL<<0)),
 157         .datafwsratio0 = ((MT47H128M16RT25E_PHY_FIFO_WE<<30) |
 158                           (MT47H128M16RT25E_PHY_FIFO_WE<<20) |
 159                           (MT47H128M16RT25E_PHY_FIFO_WE<<10) |
 160                           (MT47H128M16RT25E_PHY_FIFO_WE<<0)),
 161         .datawrsratio0 = ((MT47H128M16RT25E_PHY_WR_DATA<<30) |
 162                           (MT47H128M16RT25E_PHY_WR_DATA<<20) |
 163                           (MT47H128M16RT25E_PHY_WR_DATA<<10) |
 164                           (MT47H128M16RT25E_PHY_WR_DATA<<0)),
 165         .datauserank0delay = MT47H128M16RT25E_PHY_RANK0_DELAY,
 166         .datadldiff0 = PHY_DLL_LOCK_DIFF,
 167 };
 168
 169 static const struct cmd_control ddr2_cmd_ctrl_data = {
 170         .cmd0csratio = MT47H128M16RT25E_RATIO,
 171         .cmd0dldiff = MT47H128M16RT25E_DLL_LOCK_DIFF,
 172         .cmd0iclkout = MT47H128M16RT25E_INVERT_CLKOUT,
 173
 174         .cmd1csratio = MT47H128M16RT25E_RATIO,
 175         .cmd1dldiff = MT47H128M16RT25E_DLL_LOCK_DIFF,
 176         .cmd1iclkout = MT47H128M16RT25E_INVERT_CLKOUT,
 177
 178         .cmd2csratio = MT47H128M16RT25E_RATIO,
 179         .cmd2dldiff = MT47H128M16RT25E_DLL_LOCK_DIFF,
 180         .cmd2iclkout = MT47H128M16RT25E_INVERT_CLKOUT,
 181 };
 182
 183 static const struct emif_regs ddr2_emif_reg_data = {
 184         .sdram_config = MT47H128M16RT25E_EMIF_SDCFG,
 185         .ref_ctrl = MT47H128M16RT25E_EMIF_SDREF,
 186         .sdram_tim1 = MT47H128M16RT25E_EMIF_TIM1,
 187         .sdram_tim2 = MT47H128M16RT25E_EMIF_TIM2,
 188         .sdram_tim3 = MT47H128M16RT25E_EMIF_TIM3,
 189         .emif_ddr_phy_ctlr_1 = MT47H128M16RT25E_EMIF_READ_LATENCY,
 190 };
 191
 192 static const struct ddr_data ddr3_data = {
 193         .datardsratio0 = MT41J128MJT125_RD_DQS,
 194         .datawdsratio0 = MT41J128MJT125_WR_DQS,
 195         .datafwsratio0 = MT41J128MJT125_PHY_FIFO_WE,
 196         .datawrsratio0 = MT41J128MJT125_PHY_WR_DATA,
 197         .datadldiff0 = PHY_DLL_LOCK_DIFF,
 198 };
 199
 200 static const struct cmd_control ddr3_cmd_ctrl_data = {
 201         .cmd0csratio = MT41J128MJT125_RATIO,
 202         .cmd0dldiff = MT41J128MJT125_DLL_LOCK_DIFF,
 203         .cmd0iclkout = MT41J128MJT125_INVERT_CLKOUT,
 204
 205         .cmd1csratio = MT41J128MJT125_RATIO,
 206         .cmd1dldiff = MT41J128MJT125_DLL_LOCK_DIFF,
 207         .cmd1iclkout = MT41J128MJT125_INVERT_CLKOUT,
 208
 209         .cmd2csratio = MT41J128MJT125_RATIO,
 210         .cmd2dldiff = MT41J128MJT125_DLL_LOCK_DIFF,
 211         .cmd2iclkout = MT41J128MJT125_INVERT_CLKOUT,
 212 };
 213
 214 static struct emif_regs ddr3_emif_reg_data = {
 215         .sdram_config = MT41J128MJT125_EMIF_SDCFG,
 216         .ref_ctrl = MT41J128MJT125_EMIF_SDREF,
 217         .sdram_tim1 = MT41J128MJT125_EMIF_TIM1,
 218         .sdram_tim2 = MT41J128MJT125_EMIF_TIM2,
 219         .sdram_tim3 = MT41J128MJT125_EMIF_TIM3,
 220         .zq_config = MT41J128MJT125_ZQ_CFG,
 221         .emif_ddr_phy_ctlr_1 = MT41J128MJT125_EMIF_READ_LATENCY,
 222 };
 223 #endif
 224
 225 /*
 226  * early system init of muxing and clocks.
 227  */
 228 void s_init(void)
 229 {
 230         /* WDT1 is already running when the bootloader gets control
 231          * Disable it to avoid "random" resets
 232          */
 233         writel(0xAAAA, &wdtimer->wdtwspr);
 234         while (readl(&wdtimer->wdtwwps) != 0x0)
 235                 ;
 236         writel(0x5555, &wdtimer->wdtwspr);
 237         while (readl(&wdtimer->wdtwwps) != 0x0)
 238                 ;
 239
 240 #ifdef CONFIG_SPL_BUILD
 241         /* Setup the PLLs and the clocks for the peripherals */
 242         pll_init();
 243
 244         /* Enable RTC32K clock */
 245         rtc32k_enable();
 246
 247         /* UART softreset */
 248         u32 regVal;
 249
 250 #ifdef CONFIG_SERIAL1
 251         enable_uart0_pin_mux();
 252 #endif /* CONFIG_SERIAL1 */
 253 #ifdef CONFIG_SERIAL2
 254         enable_uart1_pin_mux();
 255 #endif /* CONFIG_SERIAL2 */
 256 #ifdef CONFIG_SERIAL3
 257         enable_uart2_pin_mux();
 258 #endif /* CONFIG_SERIAL3 */
 259 #ifdef CONFIG_SERIAL4
 260         enable_uart3_pin_mux();
 261 #endif /* CONFIG_SERIAL4 */
 262 #ifdef CONFIG_SERIAL5
 263         enable_uart4_pin_mux();
 264 #endif /* CONFIG_SERIAL5 */
 265 #ifdef CONFIG_SERIAL6
 266         enable_uart5_pin_mux();
 267 #endif /* CONFIG_SERIAL6 */
 268
 269         regVal = readl(&uart_base->uartsyscfg);
 270         regVal |= UART_RESET;
 271         writel(regVal, &uart_base->uartsyscfg);
 272         while ((readl(&uart_base->uartsyssts) &
 273                 UART_CLK_RUNNING_MASK) != UART_CLK_RUNNING_MASK)
 274                 ;
 275
 276         /* Disable smart idle */
 277         regVal = readl(&uart_base->uartsyscfg);
 278         regVal |= UART_SMART_IDLE_EN;
 279         writel(regVal, &uart_base->uartsyscfg);
 280
 281         gd = &gdata;
 282
 283         preloader_console_init();
 284
 285         /* Initalize the board header */
 286         enable_i2c0_pin_mux();
 287         i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 288         if (read_eeprom() < 0)
 289                 puts("Could not get board ID.\n");
 290
 291         enable_board_pin_mux(&header);
 292         if (board_is_evm_sk()) {
 293                 /*
 294                  * EVM SK 1.2A and later use gpio0_7 to enable DDR3.
 295                  * This is safe enough to do on older revs.
 296                  */
 297                 gpio_request(GPIO_DDR_VTT_EN, "ddr_vtt_en");
 298                 gpio_direction_output(GPIO_DDR_VTT_EN, 1);
 299         }
 300
 301         if (board_is_evm_sk() || board_is_bone_lt())
 302                 config_ddr(303, MT41J128MJT125_IOCTRL_VALUE, &ddr3_data,
 303                            &ddr3_cmd_ctrl_data, &ddr3_emif_reg_data);
 304         else
 305                 config_ddr(266, MT47H128M16RT25E_IOCTRL_VALUE, &ddr2_data,
 306                            &ddr2_cmd_ctrl_data, &ddr2_emif_reg_data);
 307 #endif
 308 }
 309
 310 /*
 311  * Basic board specific setup.  Pinmux has been handled already.
 312  */
 313 int board_init(void)
 314 {
 315         i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 316         if (read_eeprom() < 0)
 317                 puts("Could not get board ID.\n");
 318
 319         gd->bd->bi_boot_params = PHYS_DRAM_1 + 0x100;
 320
 321         return 0;
 322 }
 323
 324 #ifdef CONFIG_DRIVER_TI_CPSW
 325 static void cpsw_control(int enabled)
 326 {
 327         /* VTP can be added here */
 328
 329         return;
 330 }
 331
 332 static struct cpsw_slave_data cpsw_slaves[] = {
 333         {
 334                 .slave_reg_ofs  = 0x208,
 335                 .sliver_reg_ofs = 0xd80,
 336                 .phy_id         = 0,
 337         },
 338         {
 339                 .slave_reg_ofs  = 0x308,
 340                 .sliver_reg_ofs = 0xdc0,
 341                 .phy_id         = 1,
 342         },
 343 };
 344
 345 static struct cpsw_platform_data cpsw_data = {
 346         .mdio_base              = AM335X_CPSW_MDIO_BASE,
 347         .cpsw_base              = AM335X_CPSW_BASE,
 348         .mdio_div               = 0xff,
 349         .channels               = 8,
 350         .cpdma_reg_ofs          = 0x800,
 351         .slaves                 = 1,
 352         .slave_data             = cpsw_slaves,
 353         .ale_reg_ofs            = 0xd00,
 354         .ale_entries            = 1024,
 355         .host_port_reg_ofs      = 0x108,
 356         .hw_stats_reg_ofs       = 0x900,
 357         .mac_control            = (1 << 5),
 358         .control                = cpsw_control,
 359         .host_port_num          = 0,
 360         .version                = CPSW_CTRL_VERSION_2,
 361 };
 362
 363 int board_eth_init(bd_t *bis)
 364 {
 365         uint8_t mac_addr[6];
 366         uint32_t mac_hi, mac_lo;
 367
 368         if (!eth_getenv_enetaddr("ethaddr", mac_addr)) {
 369                 debug("<ethaddr> not set. Reading from E-fuse\n");
 370                 /* try reading mac address from efuse */
 371                 mac_lo = readl(&cdev->macid0l);
 372                 mac_hi = readl(&cdev->macid0h);
 373                 mac_addr[0] = mac_hi & 0xFF;
 374                 mac_addr[1] = (mac_hi & 0xFF00) >> 8;
 375                 mac_addr[2] = (mac_hi & 0xFF0000) >> 16;
 376                 mac_addr[3] = (mac_hi & 0xFF000000) >> 24;
 377                 mac_addr[4] = mac_lo & 0xFF;
 378                 mac_addr[5] = (mac_lo & 0xFF00) >> 8;
 379
 380                 if (is_valid_ether_addr(mac_addr))
 381                         eth_setenv_enetaddr("ethaddr", mac_addr);
 382                 else
 383                         return -1;
 384         }
 385
 386         if (board_is_bone() || board_is_bone_lt() || board_is_idk()) {
 387                 writel(MII_MODE_ENABLE, &cdev->miisel);
 388                 cpsw_slaves[0].phy_if = cpsw_slaves[1].phy_if =
 389                                 PHY_INTERFACE_MODE_MII;
 390         } else {
 391                 writel(RGMII_MODE_ENABLE, &cdev->miisel);
 392                 cpsw_slaves[0].phy_if = cpsw_slaves[1].phy_if =
 393                                 PHY_INTERFACE_MODE_RGMII;
 394         }
 395
 396         return cpsw_register(&cpsw_data);
 397 }
 398 #endif