mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-16 17:58:23 +00:00
df548d3c3e
Rewrite the resource management code (i.e. I/O memory, clock gating, gpio) so it doesn't depend on any global state. This is necessary because this code is heavily used before relocation to RAM, so we can't write to any global variables. As an added bonus, this makes u-boot's memory footprint a bit smaller, although some functionality has been left out; all clocks are enabled all the time, and there's no checking for gpio line conflicts. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* Copyright (C) 2006 Atmel Corporation
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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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 as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/io.h>
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#include <asm/arch/gpio.h>
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#include <asm/arch/memory-map.h>
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#include "pio2.h"
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void gpio_select_periph_A(unsigned int pin, int use_pullup)
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{
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void *base = gpio_pin_to_addr(pin);
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uint32_t mask = 1 << (pin & 0x1f);
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if (!base)
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panic("Invalid GPIO pin %u\n", pin);
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pio2_writel(base, ASR, mask);
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pio2_writel(base, PDR, mask);
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if (use_pullup)
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pio2_writel(base, PUER, mask);
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else
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pio2_writel(base, PUDR, mask);
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}
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void gpio_select_periph_B(unsigned int pin, int use_pullup)
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{
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void *base = gpio_pin_to_addr(pin);
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uint32_t mask = 1 << (pin & 0x1f);
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if (!base)
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panic("Invalid GPIO pin %u\n", pin);
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pio2_writel(base, BSR, mask);
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pio2_writel(base, PDR, mask);
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if (use_pullup)
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pio2_writel(base, PUER, mask);
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else
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pio2_writel(base, PUDR, mask);
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}
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