[U-Boot] [PATCH v10 01/28] dma: add bcm6348-iudma support

Álvaro Fernández Rojas
2018-11-29T22:25:19Z

BCM6348 IUDMA controller is present on multiple BMIPS (BCM63xx) SoCs.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
v10: Introduce changes suggested by Daniel Schwierzeck:
- Fix license identifiers.
- Move DMAD_ST defines out of dma desc struct definition.
- Remove unneded aigned attribute from dma desc struct definition.
- Fill dma ring from consumer driver instead of allocating a new buffer.
- Correctly check clock/reset errors while probing.
- Switch to live DM live tree.
v9: introduce dma_prepare_rcv_buf dma op:
- bcm6348_iudma_chan_stop: switch to mdelay when resetting channel.
- bcm6348_iudma_receive: track dirty dma descriptors and no longer trigger
dma rx channel.
- bcm6348_iudma_send: reorder to properly flush cache and set dma descriptor
config.
- bcm6348_iudma_prepare_rcv_buf: implemented to clear dirty dma descriptors.
v8: Introduce changes from Grygorii Strashko
v5: Several fixes and improvements:
- Remove unused defines.
- Increment rx descriptors.
- Fix flow control issues.
- Error checking now depends on hw.
- Remove unneeded interrupts.
v4: Fix issues reported by Grygorii Strashko and other fixes:
- Remove usage of net_rx_packets as buffer.
- Allocate dynamic rx buffer.
- Check dma errors and discard invalid packets.
v3: no changes
v2: Fix dma rx burst config and select DMA_CHANNELS.

drivers/dma/Kconfig | 9 +
drivers/dma/Makefile | 1 +
drivers/dma/bcm6348-iudma.c | 642 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 652 insertions(+)
create mode 100644 drivers/dma/bcm6348-iudma.c

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 8a4162eccd..1820676d7a 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -26,6 +26,15 @@ config SANDBOX_DMA
Enable support for a test DMA uclass implementation. It stimulates
DMA transfer by simple copying data between channels.

+config BCM6348_IUDMA
+ bool "BCM6348 IUDMA driver"
+ depends on ARCH_BMIPS
+ select DMA_CHANNELS
+ help
+ Enable the BCM6348 IUDMA driver.
+ This driver support data transfer from devices to
+ memory and from memory to devices.
+
config TI_EDMA3
bool "TI EDMA3 driver"
help
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index aff31f986a..b5f9147e0a 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_DMA) += dma-uclass.o

obj-$(CONFIG_FSLDMAFEC) += MCD_tasksInit.o MCD_dmaApi.o MCD_tasks.o
obj-$(CONFIG_APBH_DMA) += apbh_dma.o
+obj-$(CONFIG_BCM6348_IUDMA) += bcm6348-iudma.o
obj-$(CONFIG_FSL_DMA) += fsl_dma.o
obj-$(CONFIG_SANDBOX_DMA) += sandbox-dma-test.o
obj-$(CONFIG_TI_KSNAV) += keystone_nav.o keystone_nav_cfg.o
diff --git a/drivers/dma/bcm6348-iudma.c b/drivers/dma/bcm6348-iudma.c
new file mode 100644
index 0000000000..699f1a6754
--- /dev/null
+++ b/drivers/dma/bcm6348-iudma.c
@@ -0,0 +1,642 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
+ *
+ * Derived from linux/drivers/dma/bcm63xx-iudma.c:
+ * Copyright (C) 2015 Simon Arlott <simon@fire.lp0.eu>
+ *
+ * Derived from linux/drivers/net/ethernet/broadcom/bcm63xx_enet.c:
+ * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
+ *
+ * Derived from bcm963xx_4.12L.06B_consumer/shared/opensource/include/bcm963xx/63268_map_part.h:
+ * Copyright (C) 2000-2010 Broadcom Corporation
+ *
+ * Derived from bcm963xx_4.12L.06B_consumer/bcmdrivers/opensource/net/enet/impl4/bcmenet.c:
+ * Copyright (C) 2010 Broadcom Corporation
+ */
+
+#include <common.h>
+#include <clk.h>
+#include <dm.h>
+#include <dma-uclass.h>
+#include <memalign.h>
+#include <reset.h>
+#include <asm/io.h>
+
+#define DMA_RX_DESC 6
+#define DMA_TX_DESC 1
+
+/* DMA Channels */
+#define DMA_CHAN_FLOWC(x) ((x) >> 1)
+#define DMA_CHAN_MAX 16
+#define DMA_CHAN_SIZE 0x10
+#define DMA_CHAN_TOUT 500
+
+/* DMA Global Configuration register */
+#define DMA_CFG_REG 0x00
+#define DMA_CFG_ENABLE_SHIFT 0
+#define DMA_CFG_ENABLE_MASK (1 << DMA_CFG_ENABLE_SHIFT)
+#define DMA_CFG_FLOWC_ENABLE(x) BIT(DMA_CHAN_FLOWC(x) + 1)
+#define DMA_CFG_NCHANS_SHIFT 24
+#define DMA_CFG_NCHANS_MASK (0xf << DMA_CFG_NCHANS_SHIFT)
+
+/* DMA Global Flow Control registers */
+#define DMA_FLOWC_THR_LO_REG(x) (0x04 + DMA_CHAN_FLOWC(x) * 0x0c)
+#define DMA_FLOWC_THR_HI_REG(x) (0x08 + DMA_CHAN_FLOWC(x) * 0x0c)
+#define DMA_FLOWC_ALLOC_REG(x) (0x0c + DMA_CHAN_FLOWC(x) * 0x0c)
+#define DMA_FLOWC_ALLOC_FORCE_SHIFT 31
+#define DMA_FLOWC_ALLOC_FORCE_MASK (1 << DMA_FLOWC_ALLOC_FORCE_SHIFT)
+
+/* DMA Global Reset register */
+#define DMA_RST_REG 0x34
+#define DMA_RST_CHAN_SHIFT 0
+#define DMA_RST_CHAN_MASK(x) (1 << x)
+
+/* DMA Channel Configuration register */
+#define DMAC_CFG_REG(x) (DMA_CHAN_SIZE * (x) + 0x00)
+#define DMAC_CFG_ENABLE_SHIFT 0
+#define DMAC_CFG_ENABLE_MASK (1 << DMAC_CFG_ENABLE_SHIFT)
+#define DMAC_CFG_PKT_HALT_SHIFT 1
+#define DMAC_CFG_PKT_HALT_MASK (1 << DMAC_CFG_PKT_HALT_SHIFT)
+#define DMAC_CFG_BRST_HALT_SHIFT 2
+#define DMAC_CFG_BRST_HALT_MASK (1 << DMAC_CFG_BRST_HALT_SHIFT)
+
+/* DMA Channel Max Burst Length register */
+#define DMAC_BURST_REG(x) (DMA_CHAN_SIZE * (x) + 0x0c)
+
+/* DMA SRAM Descriptor Ring Start register */
+#define DMAS_RSTART_REG(x) (DMA_CHAN_SIZE * (x) + 0x00)
+
+/* DMA SRAM State/Bytes done/ring offset register */
+#define DMAS_STATE_DATA_REG(x) (DMA_CHAN_SIZE * (x) + 0x04)
+
+/* DMA SRAM Buffer Descriptor status and length register */
+#define DMAS_DESC_LEN_STATUS_REG(x) (DMA_CHAN_SIZE * (x) + 0x08)
+
+/* DMA SRAM Buffer Descriptor status and length register */
+#define DMAS_DESC_BASE_BUFPTR_REG(x) (DMA_CHAN_SIZE * (x) + 0x0c)
+
+/* DMA Descriptor Status */
+#define DMAD_ST_CRC_SHIFT 8
+#define DMAD_ST_CRC_MASK (1 << DMAD_ST_CRC_SHIFT)
+#define DMAD_ST_WRAP_SHIFT 12
+#define DMAD_ST_WRAP_MASK (1 << DMAD_ST_WRAP_SHIFT)
+#define DMAD_ST_SOP_SHIFT 13
+#define DMAD_ST_SOP_MASK (1 << DMAD_ST_SOP_SHIFT)
+#define DMAD_ST_EOP_SHIFT 14
+#define DMAD_ST_EOP_MASK (1 << DMAD_ST_EOP_SHIFT)
+#define DMAD_ST_OWN_SHIFT 15
+#define DMAD_ST_OWN_MASK (1 << DMAD_ST_OWN_SHIFT)
+
+#define DMAD6348_ST_OV_ERR_SHIFT 0
+#define DMAD6348_ST_OV_ERR_MASK (1 << DMAD6348_ST_OV_ERR_SHIFT)
+#define DMAD6348_ST_CRC_ERR_SHIFT 1
+#define DMAD6348_ST_CRC_ERR_MASK (1 << DMAD6348_ST_CRC_ERR_SHIFT)
+#define DMAD6348_ST_RX_ERR_SHIFT 2
+#define DMAD6348_ST_RX_ERR_MASK (1 << DMAD6348_ST_RX_ERR_SHIFT)
+#define DMAD6348_ST_OS_ERR_SHIFT 4
+#define DMAD6348_ST_OS_ERR_MASK (1 << DMAD6348_ST_OS_ERR_SHIFT)
+#define DMAD6348_ST_UN_ERR_SHIFT 9
+#define DMAD6348_ST_UN_ERR_MASK (1 << DMAD6348_ST_UN_ERR_SHIFT)
+
+struct bcm6348_dma_desc {
+ uint16_t length;
+ uint16_t status;
+ uint32_t address;
+};
+
+struct bcm6348_chan_priv {
+ void __iomem *dma_ring;
+ uint8_t dma_ring_size;
+ uint8_t desc_id;
+ uint8_t desc_cnt;
+ bool *busy_desc;
+ bool running;
+};
+
+struct bcm6348_iudma_hw {
+ uint16_t err_mask;
+};
+
+struct bcm6348_iudma_priv {
+ const struct bcm6348_iudma_hw *hw;
+ void __iomem *base;
+ void __iomem *chan;
+ void __iomem *sram;
+ struct bcm6348_chan_priv **ch_priv;
+ uint8_t n_channels;
+};
+
+static inline bool bcm6348_iudma_chan_is_rx(uint8_t ch)
+{
+ return !(ch & 1);
+}
+
+static inline void bcm6348_iudma_fdc(void *ptr, ulong size)
+{
+ ulong start = (ulong) ptr;
+
+ flush_dcache_range(start, start + size);
+}
+
+static inline void bcm6348_iudma_idc(void *ptr, ulong size)
+{
+ ulong start = (ulong) ptr;
+
+ invalidate_dcache_range(start, start + size);
+}
+
+static void bcm6348_iudma_chan_stop(struct bcm6348_iudma_priv *priv,
+ uint8_t ch)
+{
+ unsigned int timeout = DMA_CHAN_TOUT;
+
+ do {
+ uint32_t cfg, halt;
+
+ if (timeout > DMA_CHAN_TOUT / 2)
+ halt = DMAC_CFG_PKT_HALT_MASK;
+ else
+ halt = DMAC_CFG_BRST_HALT_MASK;
+
+ /* try to stop dma channel */
+ writel_be(halt, priv->chan + DMAC_CFG_REG(ch));
+ mb();
+
+ /* check if channel was stopped */
+ cfg = readl_be(priv->chan + DMAC_CFG_REG(ch));
+ if (!(cfg & DMAC_CFG_ENABLE_MASK))
+ break;
+
+ udelay(1);
+ } while (--timeout);
+
+ if (!timeout)
+ pr_err("unable to stop channel %u\n", ch);
+
+ /* reset dma channel */
+ setbits_be32(priv->base + DMA_RST_REG, DMA_RST_CHAN_MASK(ch));
+ mb();
+ clrbits_be32(priv->base + DMA_RST_REG, DMA_RST_CHAN_MASK(ch));
+}
+
+static int bcm6348_iudma_disable(struct dma *dma)
+{
+ struct bcm6348_iudma_priv *priv = dev_get_priv(dma->dev);
+ struct bcm6348_chan_priv *ch_priv = priv->ch_priv[dma->id];
+
+ /* stop dma channel */
+ bcm6348_iudma_chan_stop(priv, dma->id);
+
+ /* dma flow control */
+ if (bcm6348_iudma_chan_is_rx(dma->id))
+ writel_be(DMA_FLOWC_ALLOC_FORCE_MASK,
+ DMA_FLOWC_ALLOC_REG(dma->id));
+
+ /* init channel config */
+ ch_priv->running = false;
+ ch_priv->desc_id = 0;
+ if (bcm6348_iudma_chan_is_rx(dma->id))
+ ch_priv->desc_cnt = 0;
+ else
+ ch_priv->desc_cnt = ch_priv->dma_ring_size;
+
+ return 0;
+}
+
+static int bcm6348_iudma_enable(struct dma *dma)
+{
+ const struct bcm6348_iudma_priv *priv = dev_get_priv(dma->dev);
+ struct bcm6348_chan_priv *ch_priv = priv->ch_priv[dma->id];
+ struct bcm6348_dma_desc *dma_desc = ch_priv->dma_ring;
+ uint8_t i;
+
+ /* dma ring init */
+ for (i = 0; i < ch_priv->desc_cnt; i++) {
+ if (bcm6348_iudma_chan_is_rx(dma->id)) {
+ ch_priv->busy_desc[i] = false;
+ dma_desc->status |= DMAD_ST_OWN_MASK;
+ } else {
+ dma_desc->status = 0;
+ dma_desc->length = 0;
+ dma_desc->address = 0;
+ }
+
+ if (i == ch_priv->desc_cnt - 1)
+ dma_desc->status |= DMAD_ST_WRAP_MASK;
+
+ dma_desc++;
+ }
+
+ /* init to first descriptor */
+ ch_priv->desc_id = 0;
+
+ /* force cache writeback */
+ bcm6348_iudma_fdc(ch_priv->dma_ring,
+ sizeof(*dma_desc) * ch_priv->desc_cnt);
+
+ /* clear sram */
+ writel_be(0, priv->sram + DMAS_STATE_DATA_REG(dma->id));
+ writel_be(0, priv->sram + DMAS_DESC_LEN_STATUS_REG(dma->id));
+ writel_be(0, priv->sram + DMAS_DESC_BASE_BUFPTR_REG(dma->id));
+
+ /* set dma ring start */
+ writel_be(virt_to_phys(ch_priv->dma_ring),
+ priv->sram + DMAS_RSTART_REG(dma->id));
+
+ /* set flow control */
+ if (bcm6348_iudma_chan_is_rx(dma->id)) {
+ u32 val;
+
+ setbits_be32(priv->base + DMA_CFG_REG,
+ DMA_CFG_FLOWC_ENABLE(dma->id));
+
+ val = ch_priv->desc_cnt / 3;
+ writel_be(val, priv->base + DMA_FLOWC_THR_LO_REG(dma->id));
+
+ val = (ch_priv->desc_cnt * 2) / 3;
+ writel_be(val, priv->base + DMA_FLOWC_THR_HI_REG(dma->id));
+
+ writel_be(0, priv->base + DMA_FLOWC_ALLOC_REG(dma->id));
+ }
+
+ /* set dma max burst */
+ writel_be(ch_priv->desc_cnt,
+ priv->chan + DMAC_BURST_REG(dma->id));
+
+ /* kick rx dma channel */
+ if (bcm6348_iudma_chan_is_rx(dma->id))
+ setbits_be32(priv->chan + DMAC_CFG_REG(dma->id),
+ DMAC_CFG_ENABLE_MASK);
+
+ /* channel is now enabled */
+ ch_priv->running = true;
+
+ return 0;
+}
+
+static int bcm6348_iudma_request(struct dma *dma)
+{
+ const struct bcm6348_iudma_priv *priv = dev_get_priv(dma->dev);
+ struct bcm6348_chan_priv *ch_priv;
+
+ /* check if channel is valid */
+ if (dma->id >= priv->n_channels)
+ return -ENODEV;
+
+ /* alloc channel private data */
+ priv->ch_priv[dma->id] = calloc(1, sizeof(struct bcm6348_chan_priv));
+ if (!priv->ch_priv[dma->id])
+ return -ENOMEM;
+ ch_priv = priv->ch_priv[dma->id];
+
+ /* alloc dma ring */
+ if (bcm6348_iudma_chan_is_rx(dma->id))
+ ch_priv->dma_ring_size = DMA_RX_DESC;
+ else
+ ch_priv->dma_ring_size = DMA_TX_DESC;
+
+ ch_priv->dma_ring =
+ malloc_cache_aligned(sizeof(struct bcm6348_dma_desc) *
+ ch_priv->dma_ring_size);
+ if (!ch_priv->dma_ring)
+ return -ENOMEM;
+
+ /* init channel config */
+ ch_priv->running = false;
+ ch_priv->desc_id = 0;
+ if (bcm6348_iudma_chan_is_rx(dma->id)) {
+ ch_priv->desc_cnt = 0;
+ ch_priv->busy_desc = calloc(ch_priv->desc_cnt, sizeof(bool));
+ } else {
+ ch_priv->desc_cnt = ch_priv->dma_ring_size;
+ ch_priv->busy_desc = NULL;
+ }
+
+ return 0;
+}
+
+static int bcm6348_iudma_receive(struct dma *dma, void **dst, void *metadata)
+{
+ const struct bcm6348_iudma_priv *priv = dev_get_priv(dma->dev);
+ const struct bcm6348_iudma_hw *hw = priv->hw;
+ struct bcm6348_chan_priv *ch_priv = priv->ch_priv[dma->id];
+ struct bcm6348_dma_desc *dma_desc = dma_desc = ch_priv->dma_ring;
+ int ret;
+
+ /* get dma ring descriptor address */
+ dma_desc += ch_priv->desc_id;
+
+ /* invalidate cache data */
+ bcm6348_iudma_idc(dma_desc, sizeof(*dma_desc));
+
+ /* check dma own */
+ if (dma_desc->status & DMAD_ST_OWN_MASK)
+ return -EAGAIN;
+
+ /* check pkt */
+ if (!(dma_desc->status & DMAD_ST_EOP_MASK) ||
+ !(dma_desc->status & DMAD_ST_SOP_MASK) ||
+ (dma_desc->status & hw->err_mask)) {
+ pr_err("invalid pkt received (ch=%ld desc=%u) (st=%04x)\n",
+ dma->id, ch_priv->desc_id, dma_desc->status);
+ ret = -EAGAIN;
+ } else {
+ /* set dma buffer address */
+ *dst = phys_to_virt(dma_desc->address);
+
+ /* invalidate cache data */
+ bcm6348_iudma_idc(*dst, dma_desc->length);
+
+ /* remove crc */
+ ret = dma_desc->length - 4;
+ }
+
+ /* busy dma descriptor */
+ ch_priv->busy_desc[ch_priv->desc_id] = true;
+
+ /* increment dma descriptor */
+ ch_priv->desc_id = (ch_priv->desc_id + 1) % ch_priv->desc_cnt;
+
+ return ret;
+}
+
+static int bcm6348_iudma_send(struct dma *dma, void *src, size_t len,
+ void *metadata)
+{
+ const struct bcm6348_iudma_priv *priv = dev_get_priv(dma->dev);
+ struct bcm6348_chan_priv *ch_priv = priv->ch_priv[dma->id];
+ struct bcm6348_dma_desc *dma_desc;
+ uint16_t status;
+
+ /* flush cache */
+ bcm6348_iudma_fdc(src, len);
+
+ /* get dma ring descriptor address */
+ dma_desc = ch_priv->dma_ring;
+ dma_desc += ch_priv->desc_id;
+
+ /* config dma descriptor */
+ status = (DMAD_ST_OWN_MASK |
+ DMAD_ST_EOP_MASK |
+ DMAD_ST_CRC_MASK |
+ DMAD_ST_SOP_MASK);
+ if (ch_priv->desc_id == ch_priv->desc_cnt - 1)
+ status |= DMAD_ST_WRAP_MASK;
+
+ /* set dma descriptor */
+ dma_desc->address = virt_to_phys(src);
+ dma_desc->length = len;
+ dma_desc->status = status;
+
+ /* flush cache */
+ bcm6348_iudma_fdc(dma_desc, sizeof(*dma_desc));
+
+ /* kick tx dma channel */
+ setbits_be32(priv->chan + DMAC_CFG_REG(dma->id), DMAC_CFG_ENABLE_MASK);
+
+ /* poll dma status */
+ do {
+ /* invalidate cache */
+ bcm6348_iudma_idc(dma_desc, sizeof(*dma_desc));
+
+ if (!(dma_desc->status & DMAD_ST_OWN_MASK))
+ break;
+ } while(1);
+
+ /* increment dma descriptor */
+ ch_priv->desc_id = (ch_priv->desc_id + 1) % ch_priv->desc_cnt;
+
+ return 0;
+}
+
+static int bcm6348_iudma_free_rcv_buf(struct dma *dma, void *dst, size_t size)
+{
+ const struct bcm6348_iudma_priv *priv = dev_get_priv(dma->dev);
+ struct bcm6348_chan_priv *ch_priv = priv->ch_priv[dma->id];
+ struct bcm6348_dma_desc *dma_desc = ch_priv->dma_ring;
+ uint16_t status;
+ uint8_t i;
+ u32 cfg;
+
+ /* get dirty dma descriptor */
+ for (i = 0; i < ch_priv->desc_cnt; i++) {
+ if (phys_to_virt(dma_desc->address) == dst)
+ break;
+
+ dma_desc++;
+ }
+
+ /* dma descriptor not found */
+ if (i == ch_priv->desc_cnt) {
+ pr_err("dirty dma descriptor not found\n");
+ return -ENOENT;
+ }
+
+ /* invalidate cache */
+ bcm6348_iudma_idc(ch_priv->dma_ring,
+ sizeof(*dma_desc) * ch_priv->desc_cnt);
+
+ /* free dma descriptor */
+ ch_priv->busy_desc[i] = false;
+
+ status = DMAD_ST_OWN_MASK;
+ if (i == ch_priv->desc_cnt - 1)
+ status |= DMAD_ST_WRAP_MASK;
+
+ dma_desc->status |= status;
+ dma_desc->length = PKTSIZE_ALIGN;
+
+ /* tell dma we allocated one buffer */
+ writel_be(1, DMA_FLOWC_ALLOC_REG(dma->id));
+
+ /* flush cache */
+ bcm6348_iudma_fdc(ch_priv->dma_ring,
+ sizeof(*dma_desc) * ch_priv->desc_cnt);
+
+ /* kick rx dma channel if disabled */
+ cfg = readl_be(priv->chan + DMAC_CFG_REG(dma->id));
+ if (!(cfg & DMAC_CFG_ENABLE_MASK))
+ setbits_be32(priv->chan + DMAC_CFG_REG(dma->id),
+ DMAC_CFG_ENABLE_MASK);
+
+ return 0;
+}
+
+static int bcm6348_iudma_add_rcv_buf(struct dma *dma, void *dst, size_t size)
+{
+ const struct bcm6348_iudma_priv *priv = dev_get_priv(dma->dev);
+ struct bcm6348_chan_priv *ch_priv = priv->ch_priv[dma->id];
+ struct bcm6348_dma_desc *dma_desc = ch_priv->dma_ring;
+
+ /* no more dma descriptors available */
+ if (ch_priv->desc_cnt == ch_priv->dma_ring_size) {
+ pr_err("max number of buffers reached\n");
+ return -EINVAL;
+ }
+
+ /* get next dma descriptor */
+ dma_desc += ch_priv->desc_cnt;
+
+ /* init dma descriptor */
+ dma_desc->address = virt_to_phys(dst);
+ dma_desc->length = size;
+ dma_desc->status = 0;
+
+ /* flush cache */
+ bcm6348_iudma_fdc(dma_desc, sizeof(*dma_desc));
+
+ /* increment dma descriptors */
+ ch_priv->desc_cnt++;
+
+ return 0;
+}
+
+static int bcm6348_iudma_prepare_rcv_buf(struct dma *dma, void *dst,
+ size_t size)
+{
+ const struct bcm6348_iudma_priv *priv = dev_get_priv(dma->dev);
+ struct bcm6348_chan_priv *ch_priv = priv->ch_priv[dma->id];
+
+ /* only add new rx buffers if channel isn't running */
+ if (ch_priv->running)
+ return bcm6348_iudma_free_rcv_buf(dma, dst, size);
+ else
+ return bcm6348_iudma_add_rcv_buf(dma, dst, size);
+}
+
+static const struct dma_ops bcm6348_iudma_ops = {
+ .disable = bcm6348_iudma_disable,
+ .enable = bcm6348_iudma_enable,
+ .prepare_rcv_buf = bcm6348_iudma_prepare_rcv_buf,
+ .request = bcm6348_iudma_request,
+ .receive = bcm6348_iudma_receive,
+ .send = bcm6348_iudma_send,
+};
+
+static const struct bcm6348_iudma_hw bcm6348_hw = {
+ .err_mask = (DMAD6348_ST_OV_ERR_MASK |
+ DMAD6348_ST_CRC_ERR_MASK |
+ DMAD6348_ST_RX_ERR_MASK |
+ DMAD6348_ST_OS_ERR_MASK |
+ DMAD6348_ST_UN_ERR_MASK),
+};
+
+static const struct bcm6348_iudma_hw bcm6368_hw = {
+ .err_mask = 0,
+};
+
+static const struct udevice_id bcm6348_iudma_ids[] = {
+ {
+ .compatible = "brcm,bcm6348-iudma",
+ .data = (ulong)&bcm6348_hw,
+ }, {
+ .compatible = "brcm,bcm6368-iudma",
+ .data = (ulong)&bcm6368_hw,
+ }, { /* sentinel */ }
+};
+
+static int bcm6348_iudma_probe(struct udevice *dev)
+{
+ struct dma_dev_priv *uc_priv = dev_get_uclass_priv(dev);
+ struct bcm6348_iudma_priv *priv = dev_get_priv(dev);
+ const struct bcm6348_iudma_hw *hw =
+ (const struct bcm6348_iudma_hw *)dev_get_driver_data(dev);
+ uint8_t ch;
+ int i;
+
+ uc_priv->supported = (DMA_SUPPORTS_DEV_TO_MEM |
+ DMA_SUPPORTS_MEM_TO_DEV);
+ priv->hw = hw;
+
+ /* dma global base address */
+ priv->base = dev_remap_addr_name(dev, "dma");
+ if (!priv->base)
+ return -EINVAL;
+
+ /* dma channels base address */
+ priv->chan = dev_remap_addr_name(dev, "dma-channels");
+ if (!priv->chan)
+ return -EINVAL;
+
+ /* dma sram base address */
+ priv->sram = dev_remap_addr_name(dev, "dma-sram");
+ if (!priv->sram)
+ return -EINVAL;
+
+ /* get number of channels */
+ priv->n_channels = dev_read_u32_default(dev, "dma-channels", 8);
+ if (priv->n_channels > DMA_CHAN_MAX)
+ return -EINVAL;
+
+ /* try to enable clocks */
+ for (i = 0; ; i++) {
+ struct clk clk;
+ int ret;
+
+ ret = clk_get_by_index(dev, i, &clk);
+ if (ret < 0)
+ break;
+
+ ret = clk_enable(&clk);
+ if (ret < 0) {
+ pr_err("error enabling clock %d\n", i);
+ return ret;
+ }
+
+ ret = clk_free(&clk);
+ if (ret < 0) {
+ pr_err("error freeing clock %d\n", i);
+ return ret;
+ }
+ }
+
+ /* try to perform resets */
+ for (i = 0; ; i++) {
+ struct reset_ctl reset;
+ int ret;
+
+ ret = reset_get_by_index(dev, i, &reset);
+ if (ret < 0)
+ break;
+
+ ret = reset_deassert(&reset);
+ if (ret < 0) {
+ pr_err("error deasserting reset %d\n", i);
+ return ret;
+ }
+
+ ret = reset_free(&reset);
+ if (ret < 0) {
+ pr_err("error freeing reset %d\n", i);
+ return ret;
+ }
+ }
+
+ /* disable dma controller */
+ clrbits_be32(priv->base + DMA_CFG_REG, DMA_CFG_ENABLE_MASK);
+
+ /* alloc channel private data pointers */
+ priv->ch_priv = calloc(priv->n_channels,
+ sizeof(struct bcm6348_chan_priv*));
+ if (!priv->ch_priv)
+ return -ENOMEM;
+
+ /* stop dma channels */
+ for (ch = 0; ch < priv->n_channels; ch++)
+ bcm6348_iudma_chan_stop(priv, ch);
+
+ /* enable dma controller */
+ setbits_be32(priv->base + DMA_CFG_REG, DMA_CFG_ENABLE_MASK);
+
+ return 0;
+}
+
+U_BOOT_DRIVER(bcm6348_iudma) = {
+ .name = "bcm6348_iudma",
+ .id = UCLASS_DMA,
+ .of_match = bcm6348_iudma_ids,
+ .ops = &bcm6348_iudma_ops,
+ .priv_auto_alloc_size = sizeof(struct bcm6348_iudma_priv),
+ .probe = bcm6348_iudma_probe,
+};
--
2.11.0