Add support for the Tegra210 Audio DMA controller that is used for transferring data between system memory and the Audio sub-system. The driver only supports cyclic transfers because this is being solely used for audio. This driver is based upon the work by Dara Ramesh <dramesh@xxxxxxxxxx>. Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx> --- drivers/dma/Kconfig | 13 + drivers/dma/Makefile | 1 + drivers/dma/tegra210-adma.c | 888 ++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 902 insertions(+) create mode 100644 drivers/dma/tegra210-adma.c diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index 5c931d45fdca..1f83877f3328 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -463,6 +463,19 @@ config TEGRA20_APB_DMA This DMA controller transfers data from memory to peripheral fifo or vice versa. It does not support memory to memory data transfer. +config TEGRA210_ADMA + bool "NVIDIA Tegra210 ADMA support" + depends on ARCH_TEGRA + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Support for the NVIDIA Tegra210 ADMA controller driver. The + DMA controller has multiple DMA channels and is used to service + various audio clients in the Tegra210 audio processing engine + (APE). This DMA controller transfers data from memory to + peripheral and vice versa. It does not support memory to + memory data transfer. + config TIMB_DMA tristate "Timberdale FPGA DMA support" depends on MFD_TIMBERDALE diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index ef9c099bd2b6..0b81fb20207b 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -59,6 +59,7 @@ obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o +obj-$(CONFIG_TEGRA210_ADMA) += tegra210-adma.o obj-$(CONFIG_TIMB_DMA) += timb_dma.o obj-$(CONFIG_TI_CPPI41) += cppi41.o obj-$(CONFIG_TI_DMA_CROSSBAR) += ti-dma-crossbar.o diff --git a/drivers/dma/tegra210-adma.c b/drivers/dma/tegra210-adma.c new file mode 100644 index 000000000000..fb6a66106162 --- /dev/null +++ b/drivers/dma/tegra210-adma.c @@ -0,0 +1,888 @@ +/* + * ADMA driver for Nvidia's Tegra210 ADMA controller. + * + * Copyright (c) 2015, NVIDIA CORPORATION. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/bitops.h> +#include <linux/clk.h> +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/dma-mapping.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/iopoll.h> +#include <linux/mm.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/pm.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> +#include <linux/clk/tegra.h> + +#include "dmaengine.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_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_TX_REQ(val) (((val) & 0xf) << 28) +#define ADMA_CH_CTRL_RX_REQ(val) (((val) & 0xf) << 24) +#define ADMA_CH_CTRL_XFER_DIR(val) (((val) & 0xf) << 12) +#define ADMA_CH_CTRL_XFER_MODE_CONTINUOUS (2 << 8) +#define ADMA_CH_CTRL_XFER_FLOWCTRL_EN BIT(1) + +#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(val) (((val) & 0x7) << 20) +#define ADMA_CH_CONFIG_WEIGHT_FOR_WRR(val) ((val) & 0xf) +#define ADMA_CH_CONFIG_MAX_BUFS 8 + +#define ADMA_CH_FIFO_CTRL 0x2c +#define ADMA_CH_FIFO_CTRL_OVRFW_THRES(val) (((val) & 0xf) << 24) +#define ADMA_CH_FIFO_CTRL_STARV_THRES(val) (((val) & 0xf) << 16) +#define ADMA_CH_FIFO_CTRL_TX_SIZE(val) (((val) & 0xf) << 8) +#define ADMA_CH_FIFO_CTRL_RX_SIZE(val) ((val) & 0xf) + +#define ADMA_CH_TC_STATUS 0x30 +#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 0xc00 +#define ADMA_GLOBAL_SOFT_RESET 0xc04 +#define ADMA_GLOBAL_INT_CLEAR 0xc20 +#define ADMA_GLOBAL_CTRL 0xc24 + +#define ADMA_BURSTSIZE_16 5 +#define ADMA_AHUB_TO_MEM 2 +#define ADMA_MEM_TO_AHUB 4 + +#define ADMA_CH_REG_OFFSET(a) (a * 0x80) + +#define ADMA_CH_FIFO_CTRL_DEFAULT (ADMA_CH_FIFO_CTRL_OVRFW_THRES(1) | \ + ADMA_CH_FIFO_CTRL_STARV_THRES(1) | \ + ADMA_CH_FIFO_CTRL_TX_SIZE(3) | \ + ADMA_CH_FIFO_CTRL_RX_SIZE(3)) +struct tegra_adma; + +/* + * 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 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; + unsigned long bytes_requested; + unsigned long bytes_transferred; +}; + +/* + * 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; + char name[30]; + int irq; + void __iomem *chan_addr; + spinlock_t lock; + + /* Slave channel configuration info */ + struct dma_slave_config config; + bool config_valid; + unsigned int slave_dir; + unsigned int slave_req; + + /* 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; + struct clk *adma_clk; + void __iomem *base_addr; + unsigned int nr_channels; + unsigned int rx_requests; + unsigned int rx_requests_reserved; + unsigned int tx_requests; + unsigned int tx_requests_reserved; + + /* Used to store global command register state when suspending */ + unsigned int global_cmd; + + /* Last member of the structure */ + struct tegra_adma_chan channels[0]; +}; + +static inline void tdma_write(struct tegra_adma *tdma, u32 reg, u32 val) +{ + writel(val, tdma->base_addr + reg); +} + +static inline u32 tdma_read(struct tegra_adma *tdma, u32 reg) +{ + return readl(tdma->base_addr + 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 *config) +{ + struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); + + memcpy(&tdc->config, config, sizeof(*config)); + tdc->config_valid = true; + + return 0; +} + +static int tegra_adma_init(struct tegra_adma *tdma) +{ + u32 status; + int ret; + + /* Clear any interrupts */ + tdma_write(tdma, ADMA_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 + 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 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; + } + + 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 void tegra_adma_update_position(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); + + /* + * 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; + + tdc->tx_buf_pos = pos; + + desc->bytes_transferred = tdc->tx_buf_count * desc->ch_regs.tc; + + /* + * If we are not currently active, then it is safe to read the + * remaining words from the TC_STATUS register and add the partial + * buffer to the total transferred. + */ + if (!tdc->desc) + desc->bytes_transferred += desc->ch_regs.tc - + tdma_ch_read(tdc, ADMA_CH_TC_STATUS); +} + +static unsigned int tegra_adma_get_residue(struct tegra_adma_desc *desc) +{ + return desc->bytes_requested - (desc->bytes_transferred % + desc->bytes_requested); +} + +static irqreturn_t tegra_adma_isr(int irq, void *dev_id) +{ + struct tegra_adma_chan *tdc = dev_id; + unsigned long status; + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + + status = tegra_adma_irq_clear(tdc); + if (status == 0 || !tdc->desc) { + spin_unlock_irqrestore(&tdc->lock, flags); + return IRQ_NONE; + } + + vchan_cyclic_callback(&tdc->desc->vd); + + spin_unlock_irqrestore(&tdc->lock, flags); + + 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->lock, flags); + + if (vchan_issue_pending(&tdc->vc)) { + if (tdc->desc) + dev_warn(tdc2dev(tdc), "DMA already running\n"); + else + tegra_adma_start(tdc); + } + + spin_unlock_irqrestore(&tdc->lock, flags); +} + +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->lock, flags); + + if (tdc->desc) + tegra_adma_stop(tdc); + + vchan_get_all_descriptors(&tdc->vc, &head); + spin_unlock_irqrestore(&tdc->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; + + spin_lock_irqsave(&tdc->lock, flags); + + ret = dma_cookie_status(dc, cookie, txstate); + if (ret == DMA_COMPLETE) { + spin_unlock_irqrestore(&tdc->lock, flags); + return ret; + } + + 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) { + tegra_adma_update_position(tdc); + residual = tegra_adma_get_residue(tdc->desc); + } else { + residual = 0; + } + + dma_set_residue(txstate, residual); + + spin_unlock_irqrestore(&tdc->lock, flags); + + return ret; +} + +static int tegra_adma_set_xfer_params(struct tegra_adma_chan *tdc, + struct tegra_adma_desc *desc, + dma_addr_t buf_addr, size_t buf_len, + size_t period_len, + enum dma_transfer_direction direction) +{ + struct tegra_adma_chan_regs *ch_regs = &desc->ch_regs; + unsigned int burst_size, num_bufs; + + num_bufs = buf_len / period_len; + + if (num_bufs > ADMA_CH_CONFIG_MAX_BUFS) + return -EINVAL; + + switch (direction) { + case DMA_MEM_TO_DEV: + if (tdc->slave_dir != ADMA_MEM_TO_AHUB) + return -EINVAL; + + burst_size = fls(tdc->config.dst_maxburst); + ch_regs->config = ADMA_CH_CONFIG_SRC_BUF(num_bufs - 1); + ch_regs->ctrl = ADMA_CH_CTRL_TX_REQ(tdc->slave_req); + ch_regs->src_addr = buf_addr; + break; + + case DMA_DEV_TO_MEM: + if (tdc->slave_dir != ADMA_AHUB_TO_MEM) + return -EINVAL; + + burst_size = fls(tdc->config.src_maxburst); + ch_regs->config = ADMA_CH_CONFIG_TRG_BUF(num_bufs - 1); + ch_regs->ctrl = ADMA_CH_CTRL_RX_REQ(tdc->slave_req); + ch_regs->trg_addr = buf_addr; + break; + + default: + dev_err(tdc2dev(tdc), "DMA direction is not supported\n"); + return -EINVAL; + } + + if (!burst_size || burst_size > ADMA_BURSTSIZE_16) + burst_size = ADMA_BURSTSIZE_16; + + ch_regs->ctrl |= ADMA_CH_CTRL_XFER_DIR(tdc->slave_dir) | + ADMA_CH_CTRL_XFER_MODE_CONTINUOUS | + ADMA_CH_CTRL_XFER_FLOWCTRL_EN; + ch_regs->config |= ADMA_CH_CONFIG_BURST_SIZE(burst_size); + ch_regs->config |= ADMA_CH_CONFIG_WEIGHT_FOR_WRR(1); + ch_regs->fifo_ctrl = ADMA_CH_FIFO_CTRL_DEFAULT; + ch_regs->tc = period_len & ADMA_CH_TC_COUNT_MASK; + + return 0; +} + +static struct dma_async_tx_descriptor *tegra_adma_prep_slave_sg( + struct dma_chan *dc, struct scatterlist *sgl, unsigned int sg_len, + enum dma_transfer_direction direction, unsigned long flags, + void *context) +{ + struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); + + dev_warn(tdc2dev(tdc), "scatter-gather transfers are not supported\n"); + + return NULL; +} + +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 (!tdc->config_valid) { + dev_err(tdc2dev(tdc), "ADMA slave configuration not set\n"); + return 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_ATOMIC); + if (!desc) + return NULL; + + desc->bytes_transferred = 0; + desc->bytes_requested = buf_len; + + if (tegra_adma_set_xfer_params(tdc, desc, buf_addr, buf_len, period_len, + 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 = pm_runtime_get_sync(tdc2dev(tdc)); + if (ret) + return ret; + + dma_cookie_init(&tdc->vc.chan); + tdc->config_valid = false; + + return 0; +} + +static void tegra_adma_free_chan_resources(struct dma_chan *dc) +{ + struct tegra_adma_chan *tdc = to_tegra_adma_chan(dc); + struct tegra_adma *tdma = tdc->tdma; + + if (tdc->desc) + tegra_adma_terminate_all(dc); + + tdc->config_valid = false; + vchan_free_chan_resources(&tdc->vc); + + pm_runtime_put(tdc2dev(tdc)); + + if (tdc->slave_req) { + switch (tdc->slave_dir) { + case ADMA_AHUB_TO_MEM: + tdma->rx_requests_reserved &= ~BIT(tdc->slave_req); + break; + case ADMA_MEM_TO_AHUB: + tdma->tx_requests_reserved &= ~BIT(tdc->slave_req); + break; + default: + dev_WARN(tdc2dev(tdc), + "channel freed with invalid transfer type\n"); + break; + } + + tdc->slave_req = 0; + tdc->slave_dir = 0; + } +} + +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 slave_dir, slave_req; + + if (dma_spec->args_count != 2) + return NULL; + + slave_req = dma_spec->args[0]; + slave_dir = dma_spec->args[1]; + + if (slave_req == 0) + return NULL; + + switch (slave_dir) { + case ADMA_AHUB_TO_MEM: + if (slave_req > tdma->rx_requests) + return NULL; + + if (tdma->rx_requests_reserved & BIT(slave_req)) + return NULL; + + tdma->rx_requests_reserved |= BIT(slave_req); + break; + case ADMA_MEM_TO_AHUB: + if (slave_req > tdma->tx_requests) + return NULL; + + if (tdma->tx_requests_reserved & BIT(slave_req)) + return NULL; + + tdma->tx_requests_reserved |= BIT(slave_req); + break; + default: + dev_err(tdma->dev, "invalid transfer type\n"); + return NULL; + } + + chan = dma_get_any_slave_channel(&tdma->dma_dev); + if (!chan) + return NULL; + + tdc = to_tegra_adma_chan(chan); + tdc->slave_req = slave_req; + tdc->slave_dir = slave_dir; + + return chan; +} + +static int tegra_adma_runtime_suspend(struct device *dev) +{ + struct tegra_adma *tdma = dev_get_drvdata(dev); + + tdma->global_cmd = tdma_read(tdma, ADMA_GLOBAL_CMD); + + clk_disable_unprepare(tdma->adma_clk); + + return 0; +} + +static int tegra_adma_runtime_resume(struct device *dev) +{ + struct tegra_adma *tdma = dev_get_drvdata(dev); + int ret; + + ret = clk_prepare_enable(tdma->adma_clk); + if (ret < 0) { + dev_err(dev, "failed to enable ADMA clock: %d\n", ret); + return ret; + } + + tdma_write(tdma, ADMA_GLOBAL_CMD, tdma->global_cmd); + + return 0; +} + +static const struct of_device_id tegra_adma_of_match[] = { + { .compatible = "nvidia,tegra210-adma", }, + { }, +}; +MODULE_DEVICE_TABLE(of, tegra_adma_of_match); + +static int tegra_adma_probe(struct platform_device *pdev) +{ + const struct of_device_id *match; + struct tegra_adma *tdma; + struct resource *res; + unsigned int nr_channels; + int ret, i; + + if (!pdev->dev.of_node) { + dev_err(&pdev->dev, "no device tree node for ADMA\n"); + return -ENODEV; + } + + match = of_match_device(tegra_adma_of_match, &pdev->dev); + if (!match) { + dev_err(&pdev->dev, "no device match found\n"); + return -ENODEV; + } + + ret = of_property_read_u32(pdev->dev.of_node, "dma-channels", + &nr_channels); + if (ret) { + dev_err(&pdev->dev, "unable to find dma-channels property\n"); + return -EINVAL; + } + + tdma = devm_kzalloc(&pdev->dev, sizeof(*tdma) + nr_channels * + sizeof(struct tegra_adma_chan), GFP_KERNEL); + if (!tdma) + return -ENOMEM; + + ret = of_property_read_u32(pdev->dev.of_node, "dma-rx-requests", + &tdma->rx_requests); + if (ret) { + dev_err(&pdev->dev, "unable to find dma-rx-requests property\n"); + return -EINVAL; + } + + ret = of_property_read_u32(pdev->dev.of_node, "dma-tx-requests", + &tdma->tx_requests); + if (ret) { + dev_err(&pdev->dev, "unable to find dma-tx-requests property\n"); + return -EINVAL; + } + + tdma->dev = &pdev->dev; + tdma->nr_channels = 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->adma_clk = devm_clk_get(&pdev->dev, "adma_ape"); + if (IS_ERR(tdma->adma_clk)) { + dev_err(&pdev->dev, "ADMA clock not found\n"); + return PTR_ERR(tdma->adma_clk); + } + + pm_runtime_enable(&pdev->dev); + if (pm_runtime_enabled(&pdev->dev)) + ret = pm_runtime_get_sync(&pdev->dev); + else + ret = tegra_adma_runtime_resume(&pdev->dev); + + if (ret) { + pm_runtime_disable(&pdev->dev); + return ret; + } + + ret = tegra_adma_init(tdma); + if (ret) + goto err_pm_disable; + + 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 + ADMA_CH_REG_OFFSET(i); + + snprintf(tdc->name, sizeof(tdc->name), "adma.%d", i); + + tdc->irq = platform_get_irq(pdev, i); + if (tdc->irq < 0) { + ret = -EPROBE_DEFER; + goto err_irq; + } + + ret = devm_request_irq(&pdev->dev, tdc->irq, tegra_adma_isr, 0, + tdc->name, tdc); + if (ret) { + dev_err(&pdev->dev, + "failed to get interrupt for channel %d\n", i); + goto err_irq; + } + + spin_lock_init(&tdc->lock); + vchan_init(&tdc->vc, &tdma->dma_dev); + tdc->vc.desc_free = tegra_adma_desc_free; + tdc->tdma = tdma; + } + + 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_slave_sg = tegra_adma_prep_slave_sg; + 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); + + ret = dma_async_device_register(&tdma->dma_dev); + if (ret < 0) { + dev_err(&pdev->dev, "ADMA registration failed: %d\n", ret); + goto err_irq; + } + + 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 err_unregister_dma_dev; + } + + pm_runtime_put(&pdev->dev); + + dev_info(&pdev->dev, "Tegra210 ADMA driver registered %d channels\n", + tdma->nr_channels); + + return 0; + +err_unregister_dma_dev: + dma_async_device_unregister(&tdma->dma_dev); +err_irq: + while (--i >= 0) { + struct tegra_adma_chan *tdc = &tdma->channels[i]; + + tasklet_kill(&tdc->vc.task); + } +err_pm_disable: + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_adma_runtime_suspend(&pdev->dev); + + return ret; +} + +static int tegra_adma_remove(struct platform_device *pdev) +{ + struct tegra_adma *tdma = platform_get_drvdata(pdev); + struct tegra_adma_chan *tdc; + int i; + + dma_async_device_unregister(&tdma->dma_dev); + + for (i = 0; i < tdma->nr_channels; ++i) { + tdc = &tdma->channels[i]; + tasklet_kill(&tdc->vc.task); + } + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_adma_runtime_suspend(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tegra_adma_pm_suspend(struct device *dev) +{ + return pm_runtime_suspended(dev); +} +#endif + +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_SYSTEM_SLEEP_PM_OPS(tegra_adma_pm_suspend, NULL) +}; + +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@xxxxxxxxxx>"); +MODULE_AUTHOR("Jon Hunter <jonathanh@xxxxxxxxxx>"); +MODULE_LICENSE("GPL v2"); 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