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c164620ae2
Two of the remaining four headers are never used, the other two are only used inside of the platform code. Move them next to the files that include them and remove the Makefile trick that adds the include path. Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/*
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* arch/arm/plat-spear/pl080.c
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*
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* DMAC pl080 definitions for SPEAr platform
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*
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* Copyright (C) 2012 ST Microelectronics
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* Viresh Kumar <vireshk@kernel.org>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/amba/pl08x.h>
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#include <linux/amba/bus.h>
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#include <linux/bug.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/spinlock_types.h>
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#include "spear.h"
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#include "misc_regs.h"
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static spinlock_t lock = __SPIN_LOCK_UNLOCKED(x);
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struct {
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unsigned char busy;
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unsigned char val;
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} signals[16] = {{0, 0}, };
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int pl080_get_signal(const struct pl08x_channel_data *cd)
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{
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unsigned int signal = cd->min_signal, val;
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unsigned long flags;
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spin_lock_irqsave(&lock, flags);
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/* Return if signal is already acquired by somebody else */
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if (signals[signal].busy &&
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(signals[signal].val != cd->muxval)) {
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spin_unlock_irqrestore(&lock, flags);
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return -EBUSY;
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}
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/* If acquiring for the first time, configure it */
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if (!signals[signal].busy) {
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val = readl(DMA_CHN_CFG);
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/*
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* Each request line has two bits in DMA_CHN_CFG register. To
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* goto the bits of current request line, do left shift of
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* value by 2 * signal number.
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*/
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val &= ~(0x3 << (signal * 2));
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val |= cd->muxval << (signal * 2);
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writel(val, DMA_CHN_CFG);
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}
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signals[signal].busy++;
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signals[signal].val = cd->muxval;
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spin_unlock_irqrestore(&lock, flags);
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return signal;
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}
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void pl080_put_signal(const struct pl08x_channel_data *cd, int signal)
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{
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unsigned long flags;
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spin_lock_irqsave(&lock, flags);
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/* if signal is not used */
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if (!signals[signal].busy)
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BUG();
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signals[signal].busy--;
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spin_unlock_irqrestore(&lock, flags);
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}
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