diff options
Diffstat (limited to 'arch/avr32/cpu/hsdramc.c')
-rw-r--r-- | arch/avr32/cpu/hsdramc.c | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/arch/avr32/cpu/hsdramc.c b/arch/avr32/cpu/hsdramc.c deleted file mode 100644 index 7e48172038..0000000000 --- a/arch/avr32/cpu/hsdramc.c +++ /dev/null @@ -1,101 +0,0 @@ -/* - * Copyright (C) 2005-2006 Atmel Corporation - * - * SPDX-License-Identifier: GPL-2.0+ - */ -#include <common.h> - -#include <asm/io.h> -#include <asm/sdram.h> - -#include <asm/arch/clk.h> -#include <asm/arch/hardware.h> - -#include "hsdramc1.h" - -unsigned long sdram_init(void *sdram_base, const struct sdram_config *config) -{ - unsigned long sdram_size; - uint32_t cfgreg; - unsigned int i; - - cfgreg = (HSDRAMC1_BF(NC, config->col_bits - 8) - | HSDRAMC1_BF(NR, config->row_bits - 11) - | HSDRAMC1_BF(NB, config->bank_bits - 1) - | HSDRAMC1_BF(CAS, config->cas) - | HSDRAMC1_BF(TWR, config->twr) - | HSDRAMC1_BF(TRC, config->trc) - | HSDRAMC1_BF(TRP, config->trp) - | HSDRAMC1_BF(TRCD, config->trcd) - | HSDRAMC1_BF(TRAS, config->tras) - | HSDRAMC1_BF(TXSR, config->txsr)); - - if (config->data_bits == SDRAM_DATA_16BIT) - cfgreg |= HSDRAMC1_BIT(DBW); - - hsdramc1_writel(CR, cfgreg); - - /* Send a NOP to turn on the clock (necessary on some chips) */ - hsdramc1_writel(MR, HSDRAMC1_MODE_NOP); - hsdramc1_readl(MR); - writel(0, sdram_base); - - /* - * Initialization sequence for SDRAM, from the data sheet: - * - * 1. A minimum pause of 200 us is provided to precede any - * signal toggle. - */ - udelay(200); - - /* - * 2. A Precharge All command is issued to the SDRAM - */ - hsdramc1_writel(MR, HSDRAMC1_MODE_BANKS_PRECHARGE); - hsdramc1_readl(MR); - writel(0, sdram_base); - - /* - * 3. Eight auto-refresh (CBR) cycles are provided - */ - hsdramc1_writel(MR, HSDRAMC1_MODE_AUTO_REFRESH); - hsdramc1_readl(MR); - for (i = 0; i < 8; i++) - writel(0, sdram_base); - - /* - * 4. A mode register set (MRS) cycle is issued to program - * SDRAM parameters, in particular CAS latency and burst - * length. - * - * The address will be chosen by the SDRAMC automatically; we - * just have to make sure BA[1:0] are set to 0. - */ - hsdramc1_writel(MR, HSDRAMC1_MODE_LOAD_MODE); - hsdramc1_readl(MR); - writel(0, sdram_base); - - /* - * 5. The application must go into Normal Mode, setting Mode - * to 0 in the Mode Register and performing a write access - * at any location in the SDRAM. - */ - hsdramc1_writel(MR, HSDRAMC1_MODE_NORMAL); - hsdramc1_readl(MR); - writel(0, sdram_base); - - /* - * 6. Write refresh rate into SDRAMC refresh timer count - * register (refresh rate = timing between refresh cycles). - */ - hsdramc1_writel(TR, config->refresh_period); - - if (config->data_bits == SDRAM_DATA_16BIT) - sdram_size = 1 << (config->row_bits + config->col_bits - + config->bank_bits + 1); - else - sdram_size = 1 << (config->row_bits + config->col_bits - + config->bank_bits + 2); - - return sdram_size; -} |