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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;
- }
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