board/freescale/p1010rdb/spl_minimal.c

   1 /*
   2  * Copyright 2011 Freescale Semiconductor, Inc.
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6 #include <common.h>
   7 #include <mpc85xx.h>
   8 #include <asm/io.h>
   9 #include <ns16550.h>
  10 #include <nand.h>
  11 #include <asm/mmu.h>
  12 #include <asm/immap_85xx.h>
  13 #include <fsl_ddr_sdram.h>
  14 #include <asm/fsl_law.h>
  15 #include <asm/global_data.h>
  16
  17 DECLARE_GLOBAL_DATA_PTR;
  18
  19
  20 void sdram_init(void)
  21 {
  22         struct ccsr_ddr __iomem *ddr =
  23                 (struct ccsr_ddr __iomem *)CONFIG_SYS_FSL_DDR_ADDR;
  24         ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
  25         u32 ddr_ratio;
  26         unsigned long ddr_freq_mhz;
  27
  28         ddr_ratio = in_be32(&gur->porpllsr) & MPC85xx_PORPLLSR_DDR_RATIO;
  29         ddr_ratio = ddr_ratio >> MPC85xx_PORPLLSR_DDR_RATIO_SHIFT;
  30         ddr_freq_mhz = (CONFIG_SYS_CLK_FREQ * ddr_ratio) / 1000000;
  31
  32         /* mask off E bit */
  33         u32 svr = SVR_SOC_VER(mfspr(SPRN_SVR));
  34
  35         __raw_writel(CONFIG_SYS_DDR_CONTROL | SDRAM_CFG_32_BE, &ddr->sdram_cfg);
  36         __raw_writel(CONFIG_SYS_DDR_CS0_BNDS, &ddr->cs0_bnds);
  37         __raw_writel(CONFIG_SYS_DDR_CS0_CONFIG, &ddr->cs0_config);
  38         __raw_writel(CONFIG_SYS_DDR_CONTROL_2, &ddr->sdram_cfg_2);
  39         __raw_writel(CONFIG_SYS_DDR_DATA_INIT, &ddr->sdram_data_init);
  40
  41         if (ddr_freq_mhz < 700) {
  42                 __raw_writel(CONFIG_SYS_DDR_TIMING_3_667, &ddr->timing_cfg_3);
  43                 __raw_writel(CONFIG_SYS_DDR_TIMING_0_667, &ddr->timing_cfg_0);
  44                 __raw_writel(CONFIG_SYS_DDR_TIMING_1_667, &ddr->timing_cfg_1);
  45                 __raw_writel(CONFIG_SYS_DDR_TIMING_2_667, &ddr->timing_cfg_2);
  46                 __raw_writel(CONFIG_SYS_DDR_MODE_1_667, &ddr->sdram_mode);
  47                 __raw_writel(CONFIG_SYS_DDR_MODE_2_667, &ddr->sdram_mode_2);
  48                 __raw_writel(CONFIG_SYS_DDR_INTERVAL_667, &ddr->sdram_interval);
  49                 __raw_writel(CONFIG_SYS_DDR_CLK_CTRL_667, &ddr->sdram_clk_cntl);
  50                 __raw_writel(CONFIG_SYS_DDR_WRLVL_CONTROL_667, &ddr->ddr_wrlvl_cntl);
  51         } else {
  52                 __raw_writel(CONFIG_SYS_DDR_TIMING_3_800, &ddr->timing_cfg_3);
  53                 __raw_writel(CONFIG_SYS_DDR_TIMING_0_800, &ddr->timing_cfg_0);
  54                 __raw_writel(CONFIG_SYS_DDR_TIMING_1_800, &ddr->timing_cfg_1);
  55                 __raw_writel(CONFIG_SYS_DDR_TIMING_2_800, &ddr->timing_cfg_2);
  56                 __raw_writel(CONFIG_SYS_DDR_MODE_1_800, &ddr->sdram_mode);
  57                 __raw_writel(CONFIG_SYS_DDR_MODE_2_800, &ddr->sdram_mode_2);
  58                 __raw_writel(CONFIG_SYS_DDR_INTERVAL_800, &ddr->sdram_interval);
  59                 __raw_writel(CONFIG_SYS_DDR_CLK_CTRL_800, &ddr->sdram_clk_cntl);
  60                 __raw_writel(CONFIG_SYS_DDR_WRLVL_CONTROL_800, &ddr->ddr_wrlvl_cntl);
  61         }
  62
  63         __raw_writel(CONFIG_SYS_DDR_TIMING_4, &ddr->timing_cfg_4);
  64         __raw_writel(CONFIG_SYS_DDR_TIMING_5, &ddr->timing_cfg_5);
  65         __raw_writel(CONFIG_SYS_DDR_ZQ_CONTROL, &ddr->ddr_zq_cntl);
  66
  67         /* P1014 and it's derivatives support max 16bit DDR width */
  68         if (svr == SVR_P1014) {
  69                 __raw_writel(ddr->sdram_cfg & ~SDRAM_CFG_DBW_MASK, &ddr->sdram_cfg);
  70                 __raw_writel(ddr->sdram_cfg | SDRAM_CFG_16_BE, &ddr->sdram_cfg);
  71                 /* For CS0_BNDS we divide the start and end address by 2, so we can just
  72                  * shift the entire register to achieve the desired result and the mask
  73                  * the value so we don't write reserved fields */
  74                 __raw_writel((CONFIG_SYS_DDR_CS0_BNDS >> 1) & 0x0fff0fff, &ddr->cs0_bnds);
  75         }
  76
  77         asm volatile("sync;isync");
  78         udelay(500);
  79
  80         /* Let the controller go */
  81         out_be32(&ddr->sdram_cfg, in_be32(&ddr->sdram_cfg) | SDRAM_CFG_MEM_EN);
  82
  83         set_next_law(CONFIG_SYS_NAND_DDR_LAW, LAW_SIZE_1G, LAW_TRGT_IF_DDR_1);
  84 }
  85
  86 void board_init_f(ulong bootflag)
  87 {
  88         u32 plat_ratio;
  89         ccsr_gur_t *gur = (void *)CONFIG_SYS_MPC85xx_GUTS_ADDR;
  90
  91         /* initialize selected port with appropriate baud rate */
  92         plat_ratio = in_be32(&gur->porpllsr) & MPC85xx_PORPLLSR_PLAT_RATIO;
  93         plat_ratio >>= 1;
  94         gd->bus_clk = CONFIG_SYS_CLK_FREQ * plat_ratio;
  95
  96         NS16550_init((NS16550_t)CONFIG_SYS_NS16550_COM1,
  97                         gd->bus_clk / 16 / CONFIG_BAUDRATE);
  98
  99         puts("\nNAND boot... ");
 100
 101         /* Initialize the DDR3 */
 102         sdram_init();
 103
 104         /* copy code to RAM and jump to it - this should not return */
 105         /* NOTE - code has to be copied out of NAND buffer before
 106          * other blocks can be read.
 107          */
 108
 109         relocate_code(CONFIG_SPL_RELOC_STACK, 0, CONFIG_SPL_RELOC_TEXT_BASE);
 110 }
 111
 112 void board_init_r(gd_t *gd, ulong dest_addr)
 113 {
 114         nand_boot();
 115 }
 116
 117 void putc(char c)
 118 {
 119         if (c == '\n')
 120                 NS16550_putc((NS16550_t)CONFIG_SYS_NS16550_COM1, '\r');
 121
 122         NS16550_putc((NS16550_t)CONFIG_SYS_NS16550_COM1, c);
 123 }
 124
 125 void puts(const char *str)
 126 {
 127         while (*str)
 128                 putc(*str++);
 129 }