LXR uboot/arch/arm/mach-imx/mmdc

   1// SPDX-License-Identifier: GPL-2.0+
   2
   3#include <common.h>
   4#include <asm/io.h>
   5
   6#if defined(CONFIG_MX53)
   7#define MEMCTL_BASE     ESDCTL_BASE_ADDR
   8#elif defined(CONFIG_MX6)
   9#define MEMCTL_BASE     MMDC_P0_BASE_ADDR
  10#elif defined(CONFIG_MX7ULP)
  11#define MEMCTL_BASE     MMDC0_RBASE
  12#endif
  13static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9};
  14static const unsigned char bank_lookup[] = {3, 2};
  15
  16/* these MMDC registers are common to the IMX53 and IMX6 */
  17struct esd_mmdc_regs {
  18        u32 ctl;
  19        u32 pdc;
  20        u32 otc;
  21        u32 cfg0;
  22        u32 cfg1;
  23        u32 cfg2;
  24        u32 misc;
  25};
  26
  27#define ESD_MMDC_CTL_GET_ROW(mdctl)    ((mdctl >> 24) & 7)
  28#define ESD_MMDC_CTL_GET_COLUMN(mdctl) ((mdctl >> 20) & 7)
  29#define ESD_MMDC_CTL_GET_WIDTH(mdctl)  ((mdctl >> 16) & 3)
  30#define ESD_MMDC_CTL_GET_CS1(mdctl)    ((mdctl >> 30) & 1)
  31#define ESD_MMDC_MISC_GET_BANK(mdmisc) ((mdmisc >> 5) & 1)
  32
  33/*
  34 * imx_ddr_size - return size in bytes of DRAM according MMDC config
  35 * The MMDC MDCTL register holds the number of bits for row, col, and data
  36 * width and the MMDC MDMISC register holds the number of banks. Combine
  37 * all these bits to determine the meme size the MMDC has been configured for
  38 */
  39unsigned int imx_ddr_size(void)
  40{
  41        struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE;
  42        unsigned int ctl = readl(&mem->ctl);
  43        unsigned int misc = readl(&mem->misc);
  44        int bits = 11 + 0 + 0 + 1;      /* row + col + bank + width */
  45
  46        bits += ESD_MMDC_CTL_GET_ROW(ctl);
  47        bits += col_lookup[ESD_MMDC_CTL_GET_COLUMN(ctl)];
  48        bits += bank_lookup[ESD_MMDC_MISC_GET_BANK(misc)];
  49        bits += ESD_MMDC_CTL_GET_WIDTH(ctl);
  50        bits += ESD_MMDC_CTL_GET_CS1(ctl);
  51
  52        /* The MX6 can do only 3840 MiB of DRAM */
  53        if (bits == 32)
  54                return 0xf0000000;
  55
  56        return 1 << bits;
  57}
  58