mmdc_size.c
1.66 KB
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// SPDX-License-Identifier: GPL-2.0+
#include <common.h>
#include <asm/io.h>
#if defined(CONFIG_MX53)
#define MEMCTL_BASE ESDCTL_BASE_ADDR
#elif defined(CONFIG_MX6)
#define MEMCTL_BASE MMDC_P0_BASE_ADDR
#elif defined(CONFIG_MX7ULP)
#define MEMCTL_BASE MMDC0_RBASE
#endif
static const unsigned char col_lookup[] = {9, 10, 11, 8, 12, 9, 9, 9};
static const unsigned char bank_lookup[] = {3, 2};
/* these MMDC registers are common to the IMX53 and IMX6 */
struct esd_mmdc_regs {
u32 ctl;
u32 pdc;
u32 otc;
u32 cfg0;
u32 cfg1;
u32 cfg2;
u32 misc;
};
#define ESD_MMDC_CTL_GET_ROW(mdctl) ((ctl >> 24) & 7)
#define ESD_MMDC_CTL_GET_COLUMN(mdctl) ((ctl >> 20) & 7)
#define ESD_MMDC_CTL_GET_WIDTH(mdctl) ((ctl >> 16) & 3)
#define ESD_MMDC_CTL_GET_CS1(mdctl) ((ctl >> 30) & 1)
#define ESD_MMDC_MISC_GET_BANK(mdmisc) ((misc >> 5) & 1)
/*
* imx_ddr_size - return size in bytes of DRAM according MMDC config
* The MMDC MDCTL register holds the number of bits for row, col, and data
* width and the MMDC MDMISC register holds the number of banks. Combine
* all these bits to determine the meme size the MMDC has been configured for
*/
unsigned int imx_ddr_size(void)
{
struct esd_mmdc_regs *mem = (struct esd_mmdc_regs *)MEMCTL_BASE;
unsigned int ctl = readl(&mem->ctl);
unsigned int misc = readl(&mem->misc);
int bits = 11 + 0 + 0 + 1; /* row + col + bank + width */
bits += ESD_MMDC_CTL_GET_ROW(ctl);
bits += col_lookup[ESD_MMDC_CTL_GET_COLUMN(ctl)];
bits += bank_lookup[ESD_MMDC_MISC_GET_BANK(misc)];
bits += ESD_MMDC_CTL_GET_WIDTH(ctl);
bits += ESD_MMDC_CTL_GET_CS1(ctl);
/* The MX6 can do only 3840 MiB of DRAM */
if (bits == 32)
return 0xf0000000;
return 1 << bits;
}