LXR uboot/arch/avr32/include/asm/sdram.h

   1/*
   2 * Copyright (C) 2006 Atmel Corporation
   3 *
   4 * SPDX-License-Identifier:     GPL-2.0+
   5 */
   6#ifndef __ASM_AVR32_SDRAM_H
   7#define __ASM_AVR32_SDRAM_H
   8
   9struct sdram_config {
  10        /* Number of data bits. */
  11        enum {
  12                SDRAM_DATA_16BIT = 16,
  13                SDRAM_DATA_32BIT = 32,
  14        } data_bits;
  15
  16        /* Number of address bits */
  17        uint8_t row_bits, col_bits, bank_bits;
  18
  19        /* SDRAM timings in cycles */
  20        uint8_t cas, twr, trc, trp, trcd, tras, txsr;
  21
  22        /* SDRAM refresh period in cycles */
  23        unsigned long refresh_period;
  24};
  25
  26/*
  27 * Attempt to initialize the SDRAM controller using the specified
  28 * parameters. Return the expected size of the memory area based on
  29 * the number of address and data bits.
  30 *
  31 * The caller should verify that the configuration is correct by
  32 * running a memory test, e.g. get_ram_size().
  33 */
  34extern unsigned long sdram_init(void *sdram_base,
  35                        const struct sdram_config *config);
  36
  37#endif /* __ASM_AVR32_SDRAM_H */
  38