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https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
146 lines
3.5 KiB
C
146 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2008 by NXP Semiconductors
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* @Author: Kevin Wells
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* @Descr: LPC3250 DMA controller interface support functions
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*
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* Copyright (c) 2015 Tyco Fire Protection Products.
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*/
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#include <common.h>
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#include <errno.h>
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#include <asm/arch/dma.h>
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#include <asm/arch/cpu.h>
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#include <asm/arch/clk.h>
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#include <asm/arch/sys_proto.h>
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#include <asm/io.h>
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/* DMA controller channel register structure */
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struct dmac_chan_reg {
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u32 src_addr;
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u32 dest_addr;
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u32 lli;
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u32 control;
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u32 config_ch;
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u32 reserved[3];
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};
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/* DMA controller register structures */
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struct dma_reg {
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u32 int_stat;
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u32 int_tc_stat;
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u32 int_tc_clear;
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u32 int_err_stat;
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u32 int_err_clear;
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u32 raw_tc_stat;
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u32 raw_err_stat;
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u32 chan_enable;
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u32 sw_burst_req;
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u32 sw_single_req;
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u32 sw_last_burst_req;
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u32 sw_last_single_req;
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u32 config;
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u32 sync;
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u32 reserved[50];
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struct dmac_chan_reg dma_chan[8];
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};
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#define DMA_NO_OF_CHANNELS 8
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/* config register definitions */
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#define DMAC_CTRL_ENABLE (1 << 0) /* For enabling the DMA controller */
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static u32 alloc_ch;
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static struct dma_reg *dma = (struct dma_reg *)DMA_BASE;
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int lpc32xx_dma_get_channel(void)
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{
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int i;
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if (!alloc_ch) { /* First time caller */
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/*
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* DMA clock are enable by "lpc32xx_dma_init()" and should
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* be call by board "board_early_init_f()" function.
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*/
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/*
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* Make sure DMA controller and all channels are disabled.
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* Controller is in little-endian mode. Disable sync signals.
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*/
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writel(0, &dma->config);
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writel(0, &dma->sync);
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/* Clear interrupt and error statuses */
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writel(0xFF, &dma->int_tc_clear);
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writel(0xFF, &dma->raw_tc_stat);
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writel(0xFF, &dma->int_err_clear);
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writel(0xFF, &dma->raw_err_stat);
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/* Enable DMA controller */
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writel(DMAC_CTRL_ENABLE, &dma->config);
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}
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i = ffz(alloc_ch);
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/* Check if all the available channels are busy */
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if (unlikely(i == DMA_NO_OF_CHANNELS))
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return -1;
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alloc_ch |= BIT_MASK(i);
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return i;
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}
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int lpc32xx_dma_start_xfer(unsigned int channel,
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const struct lpc32xx_dmac_ll *desc, u32 config)
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{
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if (unlikely(((BIT_MASK(channel) & alloc_ch) == 0) ||
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(channel >= DMA_NO_OF_CHANNELS))) {
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pr_err("Request for xfer on unallocated channel %d", channel);
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return -1;
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}
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writel(BIT_MASK(channel), &dma->int_tc_clear);
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writel(BIT_MASK(channel), &dma->int_err_clear);
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writel(desc->dma_src, &dma->dma_chan[channel].src_addr);
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writel(desc->dma_dest, &dma->dma_chan[channel].dest_addr);
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writel(desc->next_lli, &dma->dma_chan[channel].lli);
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writel(desc->next_ctrl, &dma->dma_chan[channel].control);
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writel(config, &dma->dma_chan[channel].config_ch);
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return 0;
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}
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int lpc32xx_dma_wait_status(unsigned int channel)
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{
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unsigned long start;
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u32 reg;
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/* Check if given channel is valid */
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if (unlikely(channel >= DMA_NO_OF_CHANNELS)) {
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pr_err("Request for status on unallocated channel %d", channel);
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return -1;
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}
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start = get_timer(0);
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while (1) {
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reg = readl(&dma->raw_tc_stat);
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reg |= readl(dma->raw_err_stat);
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if (reg & BIT_MASK(channel))
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break;
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if (get_timer(start) > CONFIG_SYS_HZ) {
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pr_err("DMA status timeout channel %d\n", channel);
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return -ETIMEDOUT;
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}
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udelay(1);
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}
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if (unlikely(readl(&dma->raw_err_stat) & BIT_MASK(channel))) {
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setbits_le32(&dma->int_err_clear, BIT_MASK(channel));
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setbits_le32(&dma->raw_err_stat, BIT_MASK(channel));
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pr_err("DMA error on channel %d\n", channel);
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return -1;
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}
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setbits_le32(&dma->int_tc_clear, BIT_MASK(channel));
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setbits_le32(&dma->raw_tc_stat, BIT_MASK(channel));
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return 0;
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}
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