87246b7567
For a given SDRAM clock rate, SDRAM chips require memory controllers
to use a specific set of timing minimums and maximums to transfer data
reliably. These parameters can be different for different memory chips
and can also potentially vary by board.
This patch adds the infrastructure for board-*.c files to pass this
timing data to the SDRAM controller init function. The timing data is
specified in an 'omap_sdrc_params' structure, in terms of SDRC
controller register values. An array of these structs, one per SDRC
target clock rate, is passed by the board-*.c file to
omap2_init_common_hw().
This patch does not define the values for different memory chips, nor
does it use the values for anything; those will come in subsequent patches.
linux-omap source commit is bc84ecfc79.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
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* linux/arch/arm/mach-omap2/board-generic.c
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*
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* Copyright (C) 2005 Nokia Corporation
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* Author: Paul Mundt <paul.mundt@nokia.com>
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*
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* Modified from mach-omap/omap1/board-generic.c
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*
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* Code for generic OMAP2 board. Should work on many OMAP2 systems where
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* the bootloader passes the board-specific data to the kernel.
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* Do not put any board specific code to this file; create a new machine
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* type if you need custom low-level initializations.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <mach/hardware.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <mach/gpio.h>
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#include <mach/mux.h>
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#include <mach/usb.h>
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#include <mach/board.h>
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#include <mach/common.h>
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static void __init omap_generic_init_irq(void)
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{
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omap2_init_common_hw(NULL);
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omap_init_irq();
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}
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static struct omap_uart_config generic_uart_config __initdata = {
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.enabled_uarts = ((1 << 0) | (1 << 1) | (1 << 2)),
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};
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static struct omap_board_config_kernel generic_config[] = {
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{ OMAP_TAG_UART, &generic_uart_config },
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};
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static void __init omap_generic_init(void)
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{
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omap_board_config = generic_config;
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omap_board_config_size = ARRAY_SIZE(generic_config);
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omap_serial_init();
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}
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static void __init omap_generic_map_io(void)
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{
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omap2_set_globals_242x(); /* should be 242x, 243x, or 343x */
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omap2_map_common_io();
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}
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MACHINE_START(OMAP_GENERIC, "Generic OMAP24xx")
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/* Maintainer: Paul Mundt <paul.mundt@nokia.com> */
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.phys_io = 0x48000000,
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.io_pg_offst = ((0xd8000000) >> 18) & 0xfffc,
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.boot_params = 0x80000100,
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.map_io = omap_generic_map_io,
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.init_irq = omap_generic_init_irq,
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.init_machine = omap_generic_init,
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.timer = &omap_timer,
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MACHINE_END
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