dma: lpc32xx: add DMA driver
Incorporate DMA driver from legacy LPCLinux NXP BSP.
The files taken from the legacy patch are:
- lpc32xx DMA driver
- lpc3250 header file DMA registers definition.
The legacy driver was updated and clean-up as part of the integration with the latest u-boot.
Signed-off-by: Sylvain Lemieux <slemieux@tycoint.com>
Acked-by: Marek Vasut <marex@denx.de>
Tested-by: Vladimir Zapolskiy <vz@mleia.com>
diff --git a/drivers/dma/lpc32xx_dma.c b/drivers/dma/lpc32xx_dma.c
new file mode 100644
index 0000000..955adfe
--- /dev/null
+++ b/drivers/dma/lpc32xx_dma.c
@@ -0,0 +1,147 @@
+/*
+ * Copyright (C) 2008 by NXP Semiconductors
+ * @Author: Kevin Wells
+ * @Descr: LPC3250 DMA controller interface support functions
+ *
+ * Copyright (c) 2015 Tyco Fire Protection Products.
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <errno.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>
+
+/* 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))) {
+ error("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)) {
+ error("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) {
+ error("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));
+ error("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;
+}