02a00cf672
Implement Standby support. In this mode, we'll suspend all drivers,
put the SDRAM in self-refresh mode and switch off the HSB bus
("frozen" mode.)
Implement Suspend-to-mem support. In this mode, we suspend all
drivers, put the SDRAM into self-refresh mode and switch off all
internal clocks except the 32 kHz oscillator ("stop" mode.)
The lowest-level suspend code runs from a small portion of SRAM
allocated at startup time. This gets rid of a small potential race
with the SDRAM where we might try to enter self-refresh mode in the
middle of an icache burst. We also relocate all interrupt and
exception handlers to SRAM during the small window when we enter and
exit the low-power modes.
We don't need to do any special tricks to start and stop the PLL. The
main clock is automatically gated by hardware until the PLL is stable.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
76 lines
2.6 KiB
C
76 lines
2.6 KiB
C
/*
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* Register definitions for the AT32AP SDRAM Controller
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*
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* Copyright (C) 2008 Atmel Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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/* Register offsets */
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#define SDRAMC_MR 0x0000
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#define SDRAMC_TR 0x0004
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#define SDRAMC_CR 0x0008
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#define SDRAMC_HSR 0x000c
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#define SDRAMC_LPR 0x0010
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#define SDRAMC_IER 0x0014
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#define SDRAMC_IDR 0x0018
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#define SDRAMC_IMR 0x001c
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#define SDRAMC_ISR 0x0020
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#define SDRAMC_MDR 0x0024
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/* MR - Mode Register */
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#define SDRAMC_MR_MODE_NORMAL ( 0 << 0)
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#define SDRAMC_MR_MODE_NOP ( 1 << 0)
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#define SDRAMC_MR_MODE_BANKS_PRECHARGE ( 2 << 0)
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#define SDRAMC_MR_MODE_LOAD_MODE ( 3 << 0)
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#define SDRAMC_MR_MODE_AUTO_REFRESH ( 4 << 0)
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#define SDRAMC_MR_MODE_EXT_LOAD_MODE ( 5 << 0)
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#define SDRAMC_MR_MODE_POWER_DOWN ( 6 << 0)
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/* CR - Configuration Register */
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#define SDRAMC_CR_NC_8_BITS ( 0 << 0)
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#define SDRAMC_CR_NC_9_BITS ( 1 << 0)
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#define SDRAMC_CR_NC_10_BITS ( 2 << 0)
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#define SDRAMC_CR_NC_11_BITS ( 3 << 0)
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#define SDRAMC_CR_NR_11_BITS ( 0 << 2)
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#define SDRAMC_CR_NR_12_BITS ( 1 << 2)
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#define SDRAMC_CR_NR_13_BITS ( 2 << 2)
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#define SDRAMC_CR_NB_2_BANKS ( 0 << 4)
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#define SDRAMC_CR_NB_4_BANKS ( 1 << 4)
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#define SDRAMC_CR_CAS(x) ((x) << 5)
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#define SDRAMC_CR_DBW_32_BITS ( 0 << 7)
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#define SDRAMC_CR_DBW_16_BITS ( 1 << 7)
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#define SDRAMC_CR_TWR(x) ((x) << 8)
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#define SDRAMC_CR_TRC(x) ((x) << 12)
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#define SDRAMC_CR_TRP(x) ((x) << 16)
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#define SDRAMC_CR_TRCD(x) ((x) << 20)
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#define SDRAMC_CR_TRAS(x) ((x) << 24)
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#define SDRAMC_CR_TXSR(x) ((x) << 28)
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/* HSR - High Speed Register */
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#define SDRAMC_HSR_DA ( 1 << 0)
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/* LPR - Low Power Register */
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#define SDRAMC_LPR_LPCB_INHIBIT ( 0 << 0)
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#define SDRAMC_LPR_LPCB_SELF_RFR ( 1 << 0)
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#define SDRAMC_LPR_LPCB_PDOWN ( 2 << 0)
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#define SDRAMC_LPR_LPCB_DEEP_PDOWN ( 3 << 0)
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#define SDRAMC_LPR_PASR(x) ((x) << 4)
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#define SDRAMC_LPR_TCSR(x) ((x) << 8)
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#define SDRAMC_LPR_DS(x) ((x) << 10)
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#define SDRAMC_LPR_TIMEOUT(x) ((x) << 12)
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/* IER/IDR/IMR/ISR - Interrupt Enable/Disable/Mask/Status Register */
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#define SDRAMC_ISR_RES ( 1 << 0)
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/* MDR - Memory Device Register */
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#define SDRAMC_MDR_MD_SDRAM ( 0 << 0)
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#define SDRAMC_MDR_MD_LOW_PWR_SDRAM ( 1 << 0)
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/* Register access macros */
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#define sdramc_readl(reg) \
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__raw_readl((void __iomem __force *)SDRAMC_BASE + SDRAMC_##reg)
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#define sdramc_writel(reg, value) \
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__raw_writel(value, (void __iomem __force *)SDRAMC_BASE + SDRAMC_##reg)
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