diff options
Diffstat (limited to 'drivers/dma/lpc32xx_dma.c')
-rw-r--r-- | drivers/dma/lpc32xx_dma.c | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/drivers/dma/lpc32xx_dma.c b/drivers/dma/lpc32xx_dma.c deleted file mode 100644 index f15b67546a9..00000000000 --- a/drivers/dma/lpc32xx_dma.c +++ /dev/null @@ -1,150 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0+ -/* - * Copyright (C) 2008 by NXP Semiconductors - * @Author: Kevin Wells - * @Descr: LPC3250 DMA controller interface support functions - * - * Copyright (c) 2015 Tyco Fire Protection Products. - */ - -#include <errno.h> -#include <init.h> -#include <time.h> -#include <asm/arch/dma.h> -#include <asm/arch/cpu.h> -#include <asm/arch/clk.h> -#include <asm/arch/sys_proto.h> -#include <asm/io.h> -#include <linux/bitops.h> -#include <linux/delay.h> -#include <linux/printk.h> - -/* DMA controller channel register structure */ -struct dmac_chan_reg { - u32 src_addr; - u32 dest_addr; - u32 lli; - u32 control; - u32 config_ch; - u32 reserved[3]; -}; - -/* DMA controller register structures */ -struct dma_reg { - u32 int_stat; - u32 int_tc_stat; - u32 int_tc_clear; - u32 int_err_stat; - u32 int_err_clear; - u32 raw_tc_stat; - u32 raw_err_stat; - u32 chan_enable; - u32 sw_burst_req; - u32 sw_single_req; - u32 sw_last_burst_req; - u32 sw_last_single_req; - u32 config; - u32 sync; - u32 reserved[50]; - struct dmac_chan_reg dma_chan[8]; -}; - -#define DMA_NO_OF_CHANNELS 8 - -/* config register definitions */ -#define DMAC_CTRL_ENABLE (1 << 0) /* For enabling the DMA controller */ - -static u32 alloc_ch; - -static struct dma_reg *dma = (struct dma_reg *)DMA_BASE; - -int lpc32xx_dma_get_channel(void) -{ - int i; - - if (!alloc_ch) { /* First time caller */ - /* - * DMA clock are enable by "lpc32xx_dma_init()" and should - * be call by board "board_early_init_f()" function. - */ - - /* - * Make sure DMA controller and all channels are disabled. - * Controller is in little-endian mode. Disable sync signals. - */ - writel(0, &dma->config); - writel(0, &dma->sync); - - /* Clear interrupt and error statuses */ - writel(0xFF, &dma->int_tc_clear); - writel(0xFF, &dma->raw_tc_stat); - writel(0xFF, &dma->int_err_clear); - writel(0xFF, &dma->raw_err_stat); - - /* Enable DMA controller */ - writel(DMAC_CTRL_ENABLE, &dma->config); - } - - i = ffz(alloc_ch); - - /* Check if all the available channels are busy */ - if (unlikely(i == DMA_NO_OF_CHANNELS)) - return -1; - alloc_ch |= BIT_MASK(i); - return i; -} - -int lpc32xx_dma_start_xfer(unsigned int channel, - const struct lpc32xx_dmac_ll *desc, u32 config) -{ - if (unlikely(((BIT_MASK(channel) & alloc_ch) == 0) || - (channel >= DMA_NO_OF_CHANNELS))) { - pr_err("Request for xfer on unallocated channel %d", channel); - return -1; - } - writel(BIT_MASK(channel), &dma->int_tc_clear); - writel(BIT_MASK(channel), &dma->int_err_clear); - writel(desc->dma_src, &dma->dma_chan[channel].src_addr); - writel(desc->dma_dest, &dma->dma_chan[channel].dest_addr); - writel(desc->next_lli, &dma->dma_chan[channel].lli); - writel(desc->next_ctrl, &dma->dma_chan[channel].control); - writel(config, &dma->dma_chan[channel].config_ch); - - return 0; -} - -int lpc32xx_dma_wait_status(unsigned int channel) -{ - unsigned long start; - u32 reg; - - /* Check if given channel is valid */ - if (unlikely(channel >= DMA_NO_OF_CHANNELS)) { - pr_err("Request for status on unallocated channel %d", channel); - return -1; - } - - start = get_timer(0); - while (1) { - reg = readl(&dma->raw_tc_stat); - reg |= readl(dma->raw_err_stat); - if (reg & BIT_MASK(channel)) - break; - - if (get_timer(start) > CONFIG_SYS_HZ) { - pr_err("DMA status timeout channel %d\n", channel); - return -ETIMEDOUT; - } - udelay(1); - } - - if (unlikely(readl(&dma->raw_err_stat) & BIT_MASK(channel))) { - setbits_le32(&dma->int_err_clear, BIT_MASK(channel)); - setbits_le32(&dma->raw_err_stat, BIT_MASK(channel)); - pr_err("DMA error on channel %d\n", channel); - return -1; - } - setbits_le32(&dma->int_tc_clear, BIT_MASK(channel)); - setbits_le32(&dma->raw_tc_stat, BIT_MASK(channel)); - return 0; -} |