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-rw-r--r--drivers/dma/tegra210-adma.c992
1 files changed, 992 insertions, 0 deletions
diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c
new file mode 100644
index 000000000..79da93cc7
--- /dev/null
+++ b/drivers/dma/tegra210-adma.c
@@ -0,0 +1,992 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * ADMA driver for Nvidia's Tegra210 ADMA controller.
+ *
+ * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
+ */
+
+#include <linux/clk.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/of_irq.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+
+#include "virt-dma.h"
+
+#define ADMA_CH_CMD 0x00
+#define ADMA_CH_STATUS 0x0c
+#define ADMA_CH_STATUS_XFER_EN BIT(0)
+#define ADMA_CH_STATUS_XFER_PAUSED BIT(1)
+
+#define ADMA_CH_INT_STATUS 0x10
+#define ADMA_CH_INT_STATUS_XFER_DONE BIT(0)
+
+#define ADMA_CH_INT_CLEAR 0x1c
+#define ADMA_CH_CTRL 0x24
+#define ADMA_CH_CTRL_DIR(val) (((val) & 0xf) << 12)
+#define ADMA_CH_CTRL_DIR_AHUB2MEM 2
+#define ADMA_CH_CTRL_DIR_MEM2AHUB 4
+#define ADMA_CH_CTRL_MODE_CONTINUOUS (2 << 8)
+#define ADMA_CH_CTRL_FLOWCTRL_EN BIT(1)
+#define ADMA_CH_CTRL_XFER_PAUSE_SHIFT 0
+
+#define ADMA_CH_CONFIG 0x28
+#define ADMA_CH_CONFIG_SRC_BUF(val) (((val) & 0x7) << 28)
+#define ADMA_CH_CONFIG_TRG_BUF(val) (((val) & 0x7) << 24)
+#define ADMA_CH_CONFIG_BURST_SIZE_SHIFT 20
+#define ADMA_CH_CONFIG_MAX_BURST_SIZE 16
+#define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf)
+#define ADMA_CH_CONFIG_MAX_BUFS 8
+#define TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(reqs) (reqs << 4)
+
+#define ADMA_CH_FIFO_CTRL 0x2c
+#define ADMA_CH_TX_FIFO_SIZE_SHIFT 8
+#define ADMA_CH_RX_FIFO_SIZE_SHIFT 0
+
+#define ADMA_CH_LOWER_SRC_ADDR 0x34
+#define ADMA_CH_LOWER_TRG_ADDR 0x3c
+#define ADMA_CH_TC 0x44
+#define ADMA_CH_TC_COUNT_MASK 0x3ffffffc
+
+#define ADMA_CH_XFER_STATUS 0x54
+#define ADMA_CH_XFER_STATUS_COUNT_MASK 0xffff
+
+#define ADMA_GLOBAL_CMD 0x00
+#define ADMA_GLOBAL_SOFT_RESET 0x04
+
+#define TEGRA_ADMA_BURST_COMPLETE_TIME 20
+
+#define ADMA_CH_REG_FIELD_VAL(val, mask, shift) (((val) & mask) << shift)
+
+struct tegra_adma;
+
+/*
+ * struct tegra_adma_chip_data - Tegra chip specific data
+ * @adma_get_burst_config: Function callback used to set DMA burst size.
+ * @global_reg_offset: Register offset of DMA global register.
+ * @global_int_clear: Register offset of DMA global interrupt clear.
+ * @ch_req_tx_shift: Register offset for AHUB transmit channel select.
+ * @ch_req_rx_shift: Register offset for AHUB receive channel select.
+ * @ch_base_offset: Register offset of DMA channel registers.
+ * @ch_fifo_ctrl: Default value for channel FIFO CTRL register.
+ * @ch_req_mask: Mask for Tx or Rx channel select.
+ * @ch_req_max: Maximum number of Tx or Rx channels available.
+ * @ch_reg_size: Size of DMA channel register space.
+ * @nr_channels: Number of DMA channels available.
+ * @ch_fifo_size_mask: Mask for FIFO size field.
+ * @sreq_index_offset: Slave channel index offset.
+ * @has_outstanding_reqs: If DMA channel can have outstanding requests.
+ */
+struct tegra_adma_chip_data {
+ unsigned int (*adma_get_burst_config)(unsigned int burst_size);
+ unsigned int global_reg_offset;
+ unsigned int global_int_clear;
+ unsigned int ch_req_tx_shift;
+ unsigned int ch_req_rx_shift;
+ unsigned int ch_base_offset;
+ unsigned int ch_fifo_ctrl;
+ unsigned int ch_req_mask;
+ unsigned int ch_req_max;
+ unsigned int ch_reg_size;
+ unsigned int nr_channels;
+ unsigned int ch_fifo_size_mask;
+ unsigned int sreq_index_offset;
+ bool has_outstanding_reqs;
+};
+
+/*
+ * struct tegra_adma_chan_regs - Tegra ADMA channel registers
+ */
+struct tegra_adma_chan_regs {
+ unsigned int ctrl;
+ unsigned int config;
+ unsigned int src_addr;
+ unsigned int trg_addr;
+ unsigned int fifo_ctrl;
+ unsigned int cmd;
+ unsigned int tc;
+};
+
+/*
+ * struct tegra_adma_desc - Tegra ADMA descriptor to manage transfer requests.
+ */
+struct tegra_adma_desc {
+ struct virt_dma_desc vd;
+ struct tegra_adma_chan_regs ch_regs;
+ size_t buf_len;
+ size_t period_len;
+ size_t num_periods;
+};
+
+/*
+ * struct tegra_adma_chan - Tegra ADMA channel information
+ */
+struct tegra_adma_chan {
+ struct virt_dma_chan vc;
+ struct tegra_adma_desc *desc;
+ struct tegra_adma *tdma;
+ int irq;
+ void __iomem *chan_addr;
+
+ /* Slave channel configuration info */
+ struct dma_slave_config sconfig;
+ enum dma_transfer_direction sreq_dir;
+ unsigned int sreq_index;
+ bool sreq_reserved;
+ struct tegra_adma_chan_regs ch_regs;
+
+ /* Transfer count and position info */
+ unsigned int tx_buf_count;
+ unsigned int tx_buf_pos;
+};
+
+/*
+ * struct tegra_adma - Tegra ADMA controller information
+ */
+struct tegra_adma {
+ struct dma_device dma_dev;
+ struct device *dev;
+ void __iomem *base_addr;
+ struct clk *ahub_clk;
+ unsigned int nr_channels;
+ unsigned long rx_requests_reserved;
+ unsigned long tx_requests_reserved;
+
+ /* Used to store global command register state when suspending */
+ unsigned int global_cmd;
+
+ const struct tegra_adma_chip_data *cdata;
+
+ /* Last member of the structure */
+ struct tegra_adma_chan channels[];
+};
+
+static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val)
+{
+ writel(val, tdma->base_addr + tdma->cdata->global_reg_offset + reg);
+}
+
+static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg)
+{
+ return readl(tdma->base_addr + tdma->cdata->global_reg_offset + reg);
+}
+
+static inline void tdma_ch_write(struct tegra_adma_chan *tdc, u32 reg, u32 val)
+{
+ writel(val, tdc->chan_addr + reg);
+}
+
+static inline u32 tdma_ch_read(struct tegra_adma_chan *tdc, u32 reg)
+{
+ return readl(tdc->chan_addr + reg);
+}
+
+static inline struct tegra_adma_chan *to_tegra_adma_chan(struct dma_chan *dc)
+{
+ return container_of(dc, struct tegra_adma_chan, vc.chan);
+}
+
+static inline struct tegra_adma_desc *to_tegra_adma_desc(
+ struct dma_async_tx_descriptor *td)
+{
+ return container_of(td, struct tegra_adma_desc, vd.tx);
+}
+
+static inline struct device *tdc2dev(struct tegra_adma_chan *tdc)
+{
+ return tdc->tdma->dev;
+}
+
+static void tegra_adma_desc_free(struct virt_dma_desc *vd)
+{
+ kfree(container_of(vd, struct tegra_adma_desc, vd));
+}
+
+static int tegra_adma_slave_config(struct dma_chan *dc,
+ struct dma_slave_config *sconfig)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+
+ memcpy(&tdc->sconfig, sconfig, sizeof(*sconfig));
+
+ return 0;
+}
+
+static int tegra_adma_init(struct tegra_adma *tdma)
+{
+ u32 status;
+ int ret;
+
+ /* Clear any interrupts */
+ tdma_write(tdma, tdma->cdata->ch_base_offset + tdma->cdata->global_int_clear, 0x1);
+
+ /* Assert soft reset */
+ tdma_write(tdma, ADMA_GLOBAL_SOFT_RESET, 0x1);
+
+ /* Wait for reset to clear */
+ ret = readx_poll_timeout(readl,
+ tdma->base_addr +
+ tdma->cdata->global_reg_offset +
+ ADMA_GLOBAL_SOFT_RESET,
+ status, status == 0, 20, 10000);
+ if (ret)
+ return ret;
+
+ /* Enable global ADMA registers */
+ tdma_write(tdma, ADMA_GLOBAL_CMD, 1);
+
+ return 0;
+}
+
+static int tegra_adma_request_alloc(struct tegra_adma_chan *tdc,
+ enum dma_transfer_direction direction)
+{
+ struct tegra_adma *tdma = tdc->tdma;
+ unsigned int sreq_index = tdc->sreq_index;
+
+ if (tdc->sreq_reserved)
+ return tdc->sreq_dir == direction ? 0 : -EINVAL;
+
+ if (sreq_index > tdma->cdata->ch_req_max) {
+ dev_err(tdma->dev, "invalid DMA request\n");
+ return -EINVAL;
+ }
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ if (test_and_set_bit(sreq_index, &tdma->tx_requests_reserved)) {
+ dev_err(tdma->dev, "DMA request reserved\n");
+ return -EINVAL;
+ }
+ break;
+
+ case DMA_DEV_TO_MEM:
+ if (test_and_set_bit(sreq_index, &tdma->rx_requests_reserved)) {
+ dev_err(tdma->dev, "DMA request reserved\n");
+ return -EINVAL;
+ }
+ break;
+
+ default:
+ dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
+ dma_chan_name(&tdc->vc.chan));
+ return -EINVAL;
+ }
+
+ tdc->sreq_dir = direction;
+ tdc->sreq_reserved = true;
+
+ return 0;
+}
+
+static void tegra_adma_request_free(struct tegra_adma_chan *tdc)
+{
+ struct tegra_adma *tdma = tdc->tdma;
+
+ if (!tdc->sreq_reserved)
+ return;
+
+ switch (tdc->sreq_dir) {
+ case DMA_MEM_TO_DEV:
+ clear_bit(tdc->sreq_index, &tdma->tx_requests_reserved);
+ break;
+
+ case DMA_DEV_TO_MEM:
+ clear_bit(tdc->sreq_index, &tdma->rx_requests_reserved);
+ break;
+
+ default:
+ dev_WARN(tdma->dev, "channel %s has invalid transfer type\n",
+ dma_chan_name(&tdc->vc.chan));
+ return;
+ }
+
+ tdc->sreq_reserved = false;
+}
+
+static u32 tegra_adma_irq_status(struct tegra_adma_chan *tdc)
+{
+ u32 status = tdma_ch_read(tdc, ADMA_CH_INT_STATUS);
+
+ return status & ADMA_CH_INT_STATUS_XFER_DONE;
+}
+
+static u32 tegra_adma_irq_clear(struct tegra_adma_chan *tdc)
+{
+ u32 status = tegra_adma_irq_status(tdc);
+
+ if (status)
+ tdma_ch_write(tdc, ADMA_CH_INT_CLEAR, status);
+
+ return status;
+}
+
+static void tegra_adma_stop(struct tegra_adma_chan *tdc)
+{
+ unsigned int status;
+
+ /* Disable ADMA */
+ tdma_ch_write(tdc, ADMA_CH_CMD, 0);
+
+ /* Clear interrupt status */
+ tegra_adma_irq_clear(tdc);
+
+ if (readx_poll_timeout_atomic(readl, tdc->chan_addr + ADMA_CH_STATUS,
+ status, !(status & ADMA_CH_STATUS_XFER_EN),
+ 20, 10000)) {
+ dev_err(tdc2dev(tdc), "unable to stop DMA channel\n");
+ return;
+ }
+
+ kfree(tdc->desc);
+ tdc->desc = NULL;
+}
+
+static void tegra_adma_start(struct tegra_adma_chan *tdc)
+{
+ struct virt_dma_desc *vd = vchan_next_desc(&tdc->vc);
+ struct tegra_adma_chan_regs *ch_regs;
+ struct tegra_adma_desc *desc;
+
+ if (!vd)
+ return;
+
+ list_del(&vd->node);
+
+ desc = to_tegra_adma_desc(&vd->tx);
+
+ if (!desc) {
+ dev_warn(tdc2dev(tdc), "unable to start DMA, no descriptor\n");
+ return;
+ }
+
+ ch_regs = &desc->ch_regs;
+
+ tdc->tx_buf_pos = 0;
+ tdc->tx_buf_count = 0;
+ tdma_ch_write(tdc, ADMA_CH_TC, ch_regs->tc);
+ tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
+ tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_regs->src_addr);
+ tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_regs->trg_addr);
+ tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_regs->fifo_ctrl);
+ tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_regs->config);
+
+ /* Start ADMA */
+ tdma_ch_write(tdc, ADMA_CH_CMD, 1);
+
+ tdc->desc = desc;
+}
+
+static unsigned int tegra_adma_get_residue(struct tegra_adma_chan *tdc)
+{
+ struct tegra_adma_desc *desc = tdc->desc;
+ unsigned int max = ADMA_CH_XFER_STATUS_COUNT_MASK + 1;
+ unsigned int pos = tdma_ch_read(tdc, ADMA_CH_XFER_STATUS);
+ unsigned int periods_remaining;
+
+ /*
+ * Handle wrap around of buffer count register
+ */
+ if (pos < tdc->tx_buf_pos)
+ tdc->tx_buf_count += pos + (max - tdc->tx_buf_pos);
+ else
+ tdc->tx_buf_count += pos - tdc->tx_buf_pos;
+
+ periods_remaining = tdc->tx_buf_count % desc->num_periods;
+ tdc->tx_buf_pos = pos;
+
+ return desc->buf_len - (periods_remaining * desc->period_len);
+}
+
+static irqreturn_t tegra_adma_isr(int irq, void *dev_id)
+{
+ struct tegra_adma_chan *tdc = dev_id;
+ unsigned long status;
+
+ spin_lock(&tdc->vc.lock);
+
+ status = tegra_adma_irq_clear(tdc);
+ if (status == 0 || !tdc->desc) {
+ spin_unlock(&tdc->vc.lock);
+ return IRQ_NONE;
+ }
+
+ vchan_cyclic_callback(&tdc->desc->vd);
+
+ spin_unlock(&tdc->vc.lock);
+
+ return IRQ_HANDLED;
+}
+
+static void tegra_adma_issue_pending(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&tdc->vc.lock, flags);
+
+ if (vchan_issue_pending(&tdc->vc)) {
+ if (!tdc->desc)
+ tegra_adma_start(tdc);
+ }
+
+ spin_unlock_irqrestore(&tdc->vc.lock, flags);
+}
+
+static bool tegra_adma_is_paused(struct tegra_adma_chan *tdc)
+{
+ u32 csts;
+
+ csts = tdma_ch_read(tdc, ADMA_CH_STATUS);
+ csts &= ADMA_CH_STATUS_XFER_PAUSED;
+
+ return csts ? true : false;
+}
+
+static int tegra_adma_pause(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ struct tegra_adma_desc *desc = tdc->desc;
+ struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
+ int dcnt = 10;
+
+ ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
+ ch_regs->ctrl |= (1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
+ tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
+
+ while (dcnt-- && !tegra_adma_is_paused(tdc))
+ udelay(TEGRA_ADMA_BURST_COMPLETE_TIME);
+
+ if (dcnt < 0) {
+ dev_err(tdc2dev(tdc), "unable to pause DMA channel\n");
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+static int tegra_adma_resume(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ struct tegra_adma_desc *desc = tdc->desc;
+ struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
+
+ ch_regs->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
+ ch_regs->ctrl &= ~(1 << ADMA_CH_CTRL_XFER_PAUSE_SHIFT);
+ tdma_ch_write(tdc, ADMA_CH_CTRL, ch_regs->ctrl);
+
+ return 0;
+}
+
+static int tegra_adma_terminate_all(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ unsigned long flags;
+ LIST_HEAD(head);
+
+ spin_lock_irqsave(&tdc->vc.lock, flags);
+
+ if (tdc->desc)
+ tegra_adma_stop(tdc);
+
+ tegra_adma_request_free(tdc);
+ vchan_get_all_descriptors(&tdc->vc, &head);
+ spin_unlock_irqrestore(&tdc->vc.lock, flags);
+ vchan_dma_desc_free_list(&tdc->vc, &head);
+
+ return 0;
+}
+
+static enum dma_status tegra_adma_tx_status(struct dma_chan *dc,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ struct tegra_adma_desc *desc;
+ struct virt_dma_desc *vd;
+ enum dma_status ret;
+ unsigned long flags;
+ unsigned int residual;
+
+ ret = dma_cookie_status(dc, cookie, txstate);
+ if (ret == DMA_COMPLETE || !txstate)
+ return ret;
+
+ spin_lock_irqsave(&tdc->vc.lock, flags);
+
+ vd = vchan_find_desc(&tdc->vc, cookie);
+ if (vd) {
+ desc = to_tegra_adma_desc(&vd->tx);
+ residual = desc->ch_regs.tc;
+ } else if (tdc->desc && tdc->desc->vd.tx.cookie == cookie) {
+ residual = tegra_adma_get_residue(tdc);
+ } else {
+ residual = 0;
+ }
+
+ spin_unlock_irqrestore(&tdc->vc.lock, flags);
+
+ dma_set_residue(txstate, residual);
+
+ return ret;
+}
+
+static unsigned int tegra210_adma_get_burst_config(unsigned int burst_size)
+{
+ if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
+ burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
+
+ return fls(burst_size) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
+}
+
+static unsigned int tegra186_adma_get_burst_config(unsigned int burst_size)
+{
+ if (!burst_size || burst_size > ADMA_CH_CONFIG_MAX_BURST_SIZE)
+ burst_size = ADMA_CH_CONFIG_MAX_BURST_SIZE;
+
+ return (burst_size - 1) << ADMA_CH_CONFIG_BURST_SIZE_SHIFT;
+}
+
+static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc,
+ struct tegra_adma_desc *desc,
+ dma_addr_t buf_addr,
+ enum dma_transfer_direction direction)
+{
+ struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs;
+ const struct tegra_adma_chip_data *cdata = tdc->tdma->cdata;
+ unsigned int burst_size, adma_dir, fifo_size_shift;
+
+ if (desc->num_periods > ADMA_CH_CONFIG_MAX_BUFS)
+ return -EINVAL;
+
+ switch (direction) {
+ case DMA_MEM_TO_DEV:
+ fifo_size_shift = ADMA_CH_TX_FIFO_SIZE_SHIFT;
+ adma_dir = ADMA_CH_CTRL_DIR_MEM2AHUB;
+ burst_size = tdc->sconfig.dst_maxburst;
+ ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(desc->num_periods - 1);
+ ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
+ cdata->ch_req_mask,
+ cdata->ch_req_tx_shift);
+ ch_regs->src_addr = buf_addr;
+ break;
+
+ case DMA_DEV_TO_MEM:
+ fifo_size_shift = ADMA_CH_RX_FIFO_SIZE_SHIFT;
+ adma_dir = ADMA_CH_CTRL_DIR_AHUB2MEM;
+ burst_size = tdc->sconfig.src_maxburst;
+ ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(desc->num_periods - 1);
+ ch_regs->ctrl = ADMA_CH_REG_FIELD_VAL(tdc->sreq_index,
+ cdata->ch_req_mask,
+ cdata->ch_req_rx_shift);
+ ch_regs->trg_addr = buf_addr;
+ break;
+
+ default:
+ dev_err(tdc2dev(tdc), "DMA direction is not supported\n");
+ return -EINVAL;
+ }
+
+ ch_regs->ctrl |= ADMA_CH_CTRL_DIR(adma_dir) |
+ ADMA_CH_CTRL_MODE_CONTINUOUS |
+ ADMA_CH_CTRL_FLOWCTRL_EN;
+ ch_regs->config |= cdata->adma_get_burst_config(burst_size);
+ ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1);
+ if (cdata->has_outstanding_reqs)
+ ch_regs->config |= TEGRA186_ADMA_CH_CONFIG_OUTSTANDING_REQS(8);
+
+ /*
+ * 'sreq_index' represents the current ADMAIF channel number and as per
+ * HW recommendation its FIFO size should match with the corresponding
+ * ADMA channel.
+ *
+ * ADMA FIFO size is set as per below (based on default ADMAIF channel
+ * FIFO sizes):
+ * fifo_size = 0x2 (sreq_index > sreq_index_offset)
+ * fifo_size = 0x3 (sreq_index <= sreq_index_offset)
+ *
+ */
+ if (tdc->sreq_index > cdata->sreq_index_offset)
+ ch_regs->fifo_ctrl =
+ ADMA_CH_REG_FIELD_VAL(2, cdata->ch_fifo_size_mask,
+ fifo_size_shift);
+ else
+ ch_regs->fifo_ctrl =
+ ADMA_CH_REG_FIELD_VAL(3, cdata->ch_fifo_size_mask,
+ fifo_size_shift);
+
+ ch_regs->tc = desc->period_len & ADMA_CH_TC_COUNT_MASK;
+
+ return tegra_adma_request_alloc(tdc, direction);
+}
+
+static struct dma_async_tx_descriptor *tegra_adma_prep_dma_cyclic(
+ struct dma_chan *dc, dma_addr_t buf_addr, size_t buf_len,
+ size_t period_len, enum dma_transfer_direction direction,
+ unsigned long flags)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ struct tegra_adma_desc *desc = NULL;
+
+ if (!buf_len || !period_len || period_len > ADMA_CH_TC_COUNT_MASK) {
+ dev_err(tdc2dev(tdc), "invalid buffer/period len\n");
+ return NULL;
+ }
+
+ if (buf_len % period_len) {
+ dev_err(tdc2dev(tdc), "buf_len not a multiple of period_len\n");
+ return NULL;
+ }
+
+ if (!IS_ALIGNED(buf_addr, 4)) {
+ dev_err(tdc2dev(tdc), "invalid buffer alignment\n");
+ return NULL;
+ }
+
+ desc = kzalloc(sizeof(*desc), GFP_NOWAIT);
+ if (!desc)
+ return NULL;
+
+ desc->buf_len = buf_len;
+ desc->period_len = period_len;
+ desc->num_periods = buf_len / period_len;
+
+ if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, direction)) {
+ kfree(desc);
+ return NULL;
+ }
+
+ return vchan_tx_prep(&tdc->vc, &desc->vd, flags);
+}
+
+static int tegra_adma_alloc_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+ int ret;
+
+ ret = request_irq(tdc->irq, tegra_adma_isr, 0, dma_chan_name(dc), tdc);
+ if (ret) {
+ dev_err(tdc2dev(tdc), "failed to get interrupt for %s\n",
+ dma_chan_name(dc));
+ return ret;
+ }
+
+ ret = pm_runtime_resume_and_get(tdc2dev(tdc));
+ if (ret < 0) {
+ free_irq(tdc->irq, tdc);
+ return ret;
+ }
+
+ dma_cookie_init(&tdc->vc.chan);
+
+ return 0;
+}
+
+static void tegra_adma_free_chan_resources(struct dma_chan *dc)
+{
+ struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc);
+
+ tegra_adma_terminate_all(dc);
+ vchan_free_chan_resources(&tdc->vc);
+ tasklet_kill(&tdc->vc.task);
+ free_irq(tdc->irq, tdc);
+ pm_runtime_put(tdc2dev(tdc));
+
+ tdc->sreq_index = 0;
+ tdc->sreq_dir = DMA_TRANS_NONE;
+}
+
+static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct tegra_adma *tdma = ofdma->of_dma_data;
+ struct tegra_adma_chan *tdc;
+ struct dma_chan *chan;
+ unsigned int sreq_index;
+
+ if (dma_spec->args_count != 1)
+ return NULL;
+
+ sreq_index = dma_spec->args[0];
+
+ if (sreq_index == 0) {
+ dev_err(tdma->dev, "DMA request must not be 0\n");
+ return NULL;
+ }
+
+ chan = dma_get_any_slave_channel(&tdma->dma_dev);
+ if (!chan)
+ return NULL;
+
+ tdc = to_tegra_adma_chan(chan);
+ tdc->sreq_index = sreq_index;
+
+ return chan;
+}
+
+static int __maybe_unused tegra_adma_runtime_suspend(struct device *dev)
+{
+ struct tegra_adma *tdma = dev_get_drvdata(dev);
+ struct tegra_adma_chan_regs *ch_reg;
+ struct tegra_adma_chan *tdc;
+ int i;
+
+ tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD);
+ if (!tdma->global_cmd)
+ goto clk_disable;
+
+ for (i = 0; i < tdma->nr_channels; i++) {
+ tdc = &tdma->channels[i];
+ ch_reg = &tdc->ch_regs;
+ ch_reg->cmd = tdma_ch_read(tdc, ADMA_CH_CMD);
+ /* skip if channel is not active */
+ if (!ch_reg->cmd)
+ continue;
+ ch_reg->tc = tdma_ch_read(tdc, ADMA_CH_TC);
+ ch_reg->src_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_SRC_ADDR);
+ ch_reg->trg_addr = tdma_ch_read(tdc, ADMA_CH_LOWER_TRG_ADDR);
+ ch_reg->ctrl = tdma_ch_read(tdc, ADMA_CH_CTRL);
+ ch_reg->fifo_ctrl = tdma_ch_read(tdc, ADMA_CH_FIFO_CTRL);
+ ch_reg->config = tdma_ch_read(tdc, ADMA_CH_CONFIG);
+ }
+
+clk_disable:
+ clk_disable_unprepare(tdma->ahub_clk);
+
+ return 0;
+}
+
+static int __maybe_unused tegra_adma_runtime_resume(struct device *dev)
+{
+ struct tegra_adma *tdma = dev_get_drvdata(dev);
+ struct tegra_adma_chan_regs *ch_reg;
+ struct tegra_adma_chan *tdc;
+ int ret, i;
+
+ ret = clk_prepare_enable(tdma->ahub_clk);
+ if (ret) {
+ dev_err(dev, "ahub clk_enable failed: %d\n", ret);
+ return ret;
+ }
+ tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd);
+
+ if (!tdma->global_cmd)
+ return 0;
+
+ for (i = 0; i < tdma->nr_channels; i++) {
+ tdc = &tdma->channels[i];
+ ch_reg = &tdc->ch_regs;
+ /* skip if channel was not active earlier */
+ if (!ch_reg->cmd)
+ continue;
+ tdma_ch_write(tdc, ADMA_CH_TC, ch_reg->tc);
+ tdma_ch_write(tdc, ADMA_CH_LOWER_SRC_ADDR, ch_reg->src_addr);
+ tdma_ch_write(tdc, ADMA_CH_LOWER_TRG_ADDR, ch_reg->trg_addr);
+ tdma_ch_write(tdc, ADMA_CH_CTRL, ch_reg->ctrl);
+ tdma_ch_write(tdc, ADMA_CH_FIFO_CTRL, ch_reg->fifo_ctrl);
+ tdma_ch_write(tdc, ADMA_CH_CONFIG, ch_reg->config);
+ tdma_ch_write(tdc, ADMA_CH_CMD, ch_reg->cmd);
+ }
+
+ return 0;
+}
+
+static const struct tegra_adma_chip_data tegra210_chip_data = {
+ .adma_get_burst_config = tegra210_adma_get_burst_config,
+ .global_reg_offset = 0xc00,
+ .global_int_clear = 0x20,
+ .ch_req_tx_shift = 28,
+ .ch_req_rx_shift = 24,
+ .ch_base_offset = 0,
+ .ch_req_mask = 0xf,
+ .ch_req_max = 10,
+ .ch_reg_size = 0x80,
+ .nr_channels = 22,
+ .ch_fifo_size_mask = 0xf,
+ .sreq_index_offset = 2,
+ .has_outstanding_reqs = false,
+};
+
+static const struct tegra_adma_chip_data tegra186_chip_data = {
+ .adma_get_burst_config = tegra186_adma_get_burst_config,
+ .global_reg_offset = 0,
+ .global_int_clear = 0x402c,
+ .ch_req_tx_shift = 27,
+ .ch_req_rx_shift = 22,
+ .ch_base_offset = 0x10000,
+ .ch_req_mask = 0x1f,
+ .ch_req_max = 20,
+ .ch_reg_size = 0x100,
+ .nr_channels = 32,
+ .ch_fifo_size_mask = 0x1f,
+ .sreq_index_offset = 4,
+ .has_outstanding_reqs = true,
+};
+
+static const struct of_device_id tegra_adma_of_match[] = {
+ { .compatible = "nvidia,tegra210-adma", .data = &tegra210_chip_data },
+ { .compatible = "nvidia,tegra186-adma", .data = &tegra186_chip_data },
+ { },
+};
+MODULE_DEVICE_TABLE(of, tegra_adma_of_match);
+
+static int tegra_adma_probe(struct platform_device *pdev)
+{
+ const struct tegra_adma_chip_data *cdata;
+ struct tegra_adma *tdma;
+ struct resource *res;
+ int ret, i;
+
+ cdata = of_device_get_match_data(&pdev->dev);
+ if (!cdata) {
+ dev_err(&pdev->dev, "device match data not found\n");
+ return -ENODEV;
+ }
+
+ tdma = devm_kzalloc(&pdev->dev,
+ struct_size(tdma, channels, cdata->nr_channels),
+ GFP_KERNEL);
+ if (!tdma)
+ return -ENOMEM;
+
+ tdma->dev = &pdev->dev;
+ tdma->cdata = cdata;
+ tdma->nr_channels = cdata->nr_channels;
+ platform_set_drvdata(pdev, tdma);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ tdma->base_addr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(tdma->base_addr))
+ return PTR_ERR(tdma->base_addr);
+
+ tdma->ahub_clk = devm_clk_get(&pdev->dev, "d_audio");
+ if (IS_ERR(tdma->ahub_clk)) {
+ dev_err(&pdev->dev, "Error: Missing ahub controller clock\n");
+ return PTR_ERR(tdma->ahub_clk);
+ }
+
+ INIT_LIST_HEAD(&tdma->dma_dev.channels);
+ for (i = 0; i < tdma->nr_channels; i++) {
+ struct tegra_adma_chan *tdc = &tdma->channels[i];
+
+ tdc->chan_addr = tdma->base_addr + cdata->ch_base_offset
+ + (cdata->ch_reg_size * i);
+
+ tdc->irq = of_irq_get(pdev->dev.of_node, i);
+ if (tdc->irq <= 0) {
+ ret = tdc->irq ?: -ENXIO;
+ goto irq_dispose;
+ }
+
+ vchan_init(&tdc->vc, &tdma->dma_dev);
+ tdc->vc.desc_free = tegra_adma_desc_free;
+ tdc->tdma = tdma;
+ }
+
+ pm_runtime_enable(&pdev->dev);
+
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret < 0)
+ goto rpm_disable;
+
+ ret = tegra_adma_init(tdma);
+ if (ret)
+ goto rpm_put;
+
+ dma_cap_set(DMA_SLAVE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_PRIVATE, tdma->dma_dev.cap_mask);
+ dma_cap_set(DMA_CYCLIC, tdma->dma_dev.cap_mask);
+
+ tdma->dma_dev.dev = &pdev->dev;
+ tdma->dma_dev.device_alloc_chan_resources =
+ tegra_adma_alloc_chan_resources;
+ tdma->dma_dev.device_free_chan_resources =
+ tegra_adma_free_chan_resources;
+ tdma->dma_dev.device_issue_pending = tegra_adma_issue_pending;
+ tdma->dma_dev.device_prep_dma_cyclic = tegra_adma_prep_dma_cyclic;
+ tdma->dma_dev.device_config = tegra_adma_slave_config;
+ tdma->dma_dev.device_tx_status = tegra_adma_tx_status;
+ tdma->dma_dev.device_terminate_all = tegra_adma_terminate_all;
+ tdma->dma_dev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ tdma->dma_dev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ tdma->dma_dev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ tdma->dma_dev.residue_granularity = DMA_RESIDUE_GRANULARITY_SEGMENT;
+ tdma->dma_dev.device_pause = tegra_adma_pause;
+ tdma->dma_dev.device_resume = tegra_adma_resume;
+
+ ret = dma_async_device_register(&tdma->dma_dev);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret);
+ goto rpm_put;
+ }
+
+ ret = of_dma_controller_register(pdev->dev.of_node,
+ tegra_dma_of_xlate, tdma);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "ADMA OF registration failed %d\n", ret);
+ goto dma_remove;
+ }
+
+ pm_runtime_put(&pdev->dev);
+
+ dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n",
+ tdma->nr_channels);
+
+ return 0;
+
+dma_remove:
+ dma_async_device_unregister(&tdma->dma_dev);
+rpm_put:
+ pm_runtime_put_sync(&pdev->dev);
+rpm_disable:
+ pm_runtime_disable(&pdev->dev);
+irq_dispose:
+ while (--i >= 0)
+ irq_dispose_mapping(tdma->channels[i].irq);
+
+ return ret;
+}
+
+static int tegra_adma_remove(struct platform_device *pdev)
+{
+ struct tegra_adma *tdma = platform_get_drvdata(pdev);
+ int i;
+
+ of_dma_controller_free(pdev->dev.of_node);
+ dma_async_device_unregister(&tdma->dma_dev);
+
+ for (i = 0; i < tdma->nr_channels; ++i)
+ irq_dispose_mapping(tdma->channels[i].irq);
+
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static const struct dev_pm_ops tegra_adma_dev_pm_ops = {
+ SET_RUNTIME_PM_OPS(tegra_adma_runtime_suspend,
+ tegra_adma_runtime_resume, NULL)
+ SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+};
+
+static struct platform_driver tegra_admac_driver = {
+ .driver = {
+ .name = "tegra-adma",
+ .pm = &tegra_adma_dev_pm_ops,
+ .of_match_table = tegra_adma_of_match,
+ },
+ .probe = tegra_adma_probe,
+ .remove = tegra_adma_remove,
+};
+
+module_platform_driver(tegra_admac_driver);
+
+MODULE_ALIAS("platform:tegra210-adma");
+MODULE_DESCRIPTION("NVIDIA Tegra ADMA driver");
+MODULE_AUTHOR("Dara Ramesh <dramesh@nvidia.com>");
+MODULE_AUTHOR("Jon Hunter <jonathanh@nvidia.com>");
+MODULE_LICENSE("GPL v2");