Move code that is common between the Tegra20-APB DMA and Tegra210 ADMA driver into separate source files. Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx> --- drivers/dma/Kconfig | 4 + drivers/dma/Makefile | 1 + drivers/dma/tegra-common.c | 733 ++++++++++++++++++++++++++++++++++ drivers/dma/tegra-common.h | 226 +++++++++++ drivers/dma/tegra20-apb-dma.c | 910 +----------------------------------------- 5 files changed, 972 insertions(+), 902 deletions(-) create mode 100644 drivers/dma/tegra-common.c create mode 100644 drivers/dma/tegra-common.h diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index ff50af3f1bb0..dd79b0bf0876 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -189,10 +189,14 @@ config TXX9_DMAC Support the TXx9 SoC internal DMA controller. This can be integrated in chips such as the Toshiba TX4927/38/39. +config TEGRA_DMA_COMMON + bool + config TEGRA20_APB_DMA bool "NVIDIA Tegra20 APB DMA support" depends on ARCH_TEGRA select DMA_ENGINE + select TEGRA_DMA_COMMON help Support for the NVIDIA Tegra20 APB DMA controller driver. The DMA controller is having multiple DMA channel which can be diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index 264eb3c52446..d9c2bf5ef0bd 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -32,6 +32,7 @@ obj-$(CONFIG_SIRF_DMA) += sirf-dma.o obj-$(CONFIG_TI_EDMA) += edma.o obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o +obj-$(CONFIG_TEGRA_DMA_COMMON) += tegra-common.o obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o obj-$(CONFIG_PL330_DMA) += pl330.o obj-$(CONFIG_PCH_DMA) += pch_dma.o diff --git a/drivers/dma/tegra-common.c b/drivers/dma/tegra-common.c new file mode 100644 index 000000000000..fff0a143f5bb --- /dev/null +++ b/drivers/dma/tegra-common.c @@ -0,0 +1,733 @@ +/* + * Helper functions for NVIDIA DMA drivers. + * + * 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. + */ + +#include <linux/delay.h> +#include <linux/dmaengine.h> +#include <linux/interrupt.h> +#include <linux/pm_runtime.h> +#include <linux/slab.h> + +#include "dmaengine.h" +#include "tegra-common.h" + +static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd) +{ + struct tegra_dma_desc *dma_desc = txd_to_tegra_dma_desc(txd); + struct tegra_dma_channel *tdc = to_tegra_dma_chan(txd->chan); + unsigned long flags; + dma_cookie_t cookie; + + spin_lock_irqsave(&tdc->lock, flags); + dma_desc->dma_status = DMA_IN_PROGRESS; + cookie = dma_cookie_assign(&dma_desc->txd); + list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req); + spin_unlock_irqrestore(&tdc->lock, flags); + return cookie; +} + +/* Get DMA desc from free list, if not there then allocate it. */ +static struct tegra_dma_desc *tegra_dma_desc_get(struct tegra_dma_channel *tdc) +{ + struct tegra_dma_desc *dma_desc; + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + + /* Do not allocate if desc are waiting for ack */ + list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) { + if (async_tx_test_ack(&dma_desc->txd)) { + list_del(&dma_desc->node); + spin_unlock_irqrestore(&tdc->lock, flags); + dma_desc->txd.flags = 0; + return dma_desc; + } + } + + spin_unlock_irqrestore(&tdc->lock, flags); + + /* Allocate DMA desc */ + dma_desc = kzalloc(sizeof(*dma_desc), GFP_ATOMIC); + if (!dma_desc) + return NULL; + + dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan); + dma_desc->txd.tx_submit = tegra_dma_tx_submit; + dma_desc->txd.flags = 0; + return dma_desc; +} + +static void tegra_dma_desc_put(struct tegra_dma_channel *tdc, + struct tegra_dma_desc *dma_desc) +{ + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + if (!list_empty(&dma_desc->tx_list)) + list_splice_init(&dma_desc->tx_list, &tdc->free_sg_req); + list_add_tail(&dma_desc->node, &tdc->free_dma_desc); + spin_unlock_irqrestore(&tdc->lock, flags); +} + +static struct tegra_dma_sg_req *tegra_dma_sg_req_get( + struct tegra_dma_channel *tdc) +{ + struct tegra_dma_sg_req *sg_req = NULL; + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + if (!list_empty(&tdc->free_sg_req)) { + sg_req = list_first_entry(&tdc->free_sg_req, + typeof(*sg_req), node); + list_del(&sg_req->node); + spin_unlock_irqrestore(&tdc->lock, flags); + return sg_req; + } + spin_unlock_irqrestore(&tdc->lock, flags); + + return kzalloc(sizeof(struct tegra_dma_sg_req), GFP_ATOMIC); +} + +static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *nsg_req) +{ + const struct tegra_dma_ops *ops = tdc->tdma->ops; + unsigned long status; + + /* + * The DMA controller reloads the new configuration for next transfer + * after last burst of current transfer completes. + * If there is no IEC status then this makes sure that last burst + * has not be completed. There may be case that last burst is on + * flight and so it can complete but because DMA is paused, it + * will not generates interrupt as well as not reload the new + * configuration. + * If there is already IEC status then interrupt handler need to + * load new configuration. + */ + ops->pause(tdc, false); + status = ops->irq_status(tdc); + + /* + * If interrupt is pending then do nothing as the ISR will handle + * the programing for new request. + */ + if (status) { + dev_err(tdc2dev(tdc), + "Skipping new configuration as interrupt is pending\n"); + ops->resume(tdc); + return; + } + + /* Safe to program new configuration */ + ops->program(tdc, nsg_req); + ops->resume(tdc); +} + +static void tdc_start_head_req(struct tegra_dma_channel *tdc) +{ + const struct tegra_dma_ops *ops = tdc->tdma->ops; + struct tegra_dma_sg_req *sg_req; + + if (list_empty(&tdc->pending_sg_req)) + return; + + sg_req = list_first_entry(&tdc->pending_sg_req, + typeof(*sg_req), node); + ops->start(tdc, sg_req); + sg_req->configured = true; + tdc->busy = true; +} + +static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc) +{ + struct tegra_dma_sg_req *hsgreq; + struct tegra_dma_sg_req *hnsgreq; + + if (list_empty(&tdc->pending_sg_req)) + return; + + hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node); + if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) { + hnsgreq = list_first_entry(&hsgreq->node, + typeof(*hnsgreq), node); + tegra_dma_configure_for_next(tdc, hnsgreq); + } +} + +static inline int get_current_xferred_count(struct tegra_dma_sg_req *sg_req, + unsigned long wcount) +{ + return sg_req->req_len - wcount; +} + +static void tegra_dma_abort_all(struct tegra_dma_channel *tdc) +{ + struct tegra_dma_sg_req *sgreq; + struct tegra_dma_desc *dma_desc; + + while (!list_empty(&tdc->pending_sg_req)) { + sgreq = list_first_entry(&tdc->pending_sg_req, + typeof(*sgreq), node); + list_move_tail(&sgreq->node, &tdc->free_sg_req); + if (sgreq->last_sg) { + dma_desc = sgreq->dma_desc; + dma_desc->dma_status = DMA_ERROR; + list_add_tail(&dma_desc->node, &tdc->free_dma_desc); + + /* Add in cb list if it is not there. */ + if (!dma_desc->cb_count) + list_add_tail(&dma_desc->cb_node, + &tdc->cb_desc); + dma_desc->cb_count++; + } + } + tdc->isr_handler = NULL; +} + +static bool handle_continuous_head_request(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *last_sg_req, + bool to_terminate) +{ + const struct tegra_dma_ops *ops = tdc->tdma->ops; + struct tegra_dma_sg_req *hsgreq = NULL; + + if (list_empty(&tdc->pending_sg_req)) { + dev_err(tdc2dev(tdc), "Dma is running without req\n"); + ops->stop(tdc); + return false; + } + + /* + * Check that head req on list should be in flight. + * If it is not in flight then abort transfer as + * looping of transfer can not continue. + */ + hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node); + if (!hsgreq->configured) { + ops->stop(tdc); + dev_err(tdc2dev(tdc), "Error in dma transfer, aborting dma\n"); + tegra_dma_abort_all(tdc); + return false; + } + + /* Configure next request */ + if (!to_terminate) + tdc_configure_next_head_desc(tdc); + return true; +} + +static void handle_once_dma_done(struct tegra_dma_channel *tdc, + bool to_terminate) +{ + struct tegra_dma_sg_req *sgreq; + struct tegra_dma_desc *dma_desc; + + tdc->busy = false; + sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node); + dma_desc = sgreq->dma_desc; + dma_desc->bytes_transferred += sgreq->req_len; + + list_del(&sgreq->node); + if (sgreq->last_sg) { + dma_desc->dma_status = DMA_COMPLETE; + dma_cookie_complete(&dma_desc->txd); + if (!dma_desc->cb_count) + list_add_tail(&dma_desc->cb_node, &tdc->cb_desc); + dma_desc->cb_count++; + list_add_tail(&dma_desc->node, &tdc->free_dma_desc); + } + list_add_tail(&sgreq->node, &tdc->free_sg_req); + + /* Do not start DMA if it is going to be terminate */ + if (to_terminate || list_empty(&tdc->pending_sg_req)) + return; + + tdc_start_head_req(tdc); +} + +static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc, + bool to_terminate) +{ + struct tegra_dma_sg_req *sgreq; + struct tegra_dma_desc *dma_desc; + bool st; + + sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node); + dma_desc = sgreq->dma_desc; + dma_desc->bytes_transferred += sgreq->req_len; + + /* Callback need to be call */ + if (!dma_desc->cb_count) + list_add_tail(&dma_desc->cb_node, &tdc->cb_desc); + dma_desc->cb_count++; + + /* If not last req then put at end of pending list */ + if (!list_is_last(&sgreq->node, &tdc->pending_sg_req)) { + list_move_tail(&sgreq->node, &tdc->pending_sg_req); + sgreq->configured = false; + st = handle_continuous_head_request(tdc, sgreq, to_terminate); + if (!st) + dma_desc->dma_status = DMA_ERROR; + } +} + +int tegra_dma_slave_config(struct dma_chan *dc, + struct dma_slave_config *sconfig) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + + if (!list_empty(&tdc->pending_sg_req)) { + dev_err(tdc2dev(tdc), "Configuration not allowed\n"); + return -EBUSY; + } + + memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig)); + if (!tdc->slave_id) + tdc->slave_id = sconfig->slave_id; + tdc->config_init = true; + return 0; +} + +void tegra_dma_tasklet(unsigned long data) +{ + struct tegra_dma_channel *tdc = (struct tegra_dma_channel *)data; + dma_async_tx_callback callback = NULL; + void *callback_param = NULL; + struct tegra_dma_desc *dma_desc; + unsigned long flags; + int cb_count; + + spin_lock_irqsave(&tdc->lock, flags); + while (!list_empty(&tdc->cb_desc)) { + dma_desc = list_first_entry(&tdc->cb_desc, + typeof(*dma_desc), cb_node); + list_del(&dma_desc->cb_node); + callback = dma_desc->txd.callback; + callback_param = dma_desc->txd.callback_param; + cb_count = dma_desc->cb_count; + dma_desc->cb_count = 0; + spin_unlock_irqrestore(&tdc->lock, flags); + while (cb_count-- && callback) + callback(callback_param); + spin_lock_irqsave(&tdc->lock, flags); + } + spin_unlock_irqrestore(&tdc->lock, flags); +} + +irqreturn_t tegra_dma_isr(int irq, void *dev_id) +{ + struct tegra_dma_channel *tdc = dev_id; + const struct tegra_dma_ops *ops = tdc->tdma->ops; + unsigned long status; + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + + status = ops->irq_clear(tdc); + if (status) { + tdc->isr_handler(tdc, false); + tasklet_schedule(&tdc->tasklet); + spin_unlock_irqrestore(&tdc->lock, flags); + return IRQ_HANDLED; + } + + spin_unlock_irqrestore(&tdc->lock, flags); + dev_info(tdc2dev(tdc), + "Interrupt already served status 0x%08lx\n", status); + return IRQ_NONE; +} + +void tegra_dma_issue_pending(struct dma_chan *dc) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + unsigned long flags; + + spin_lock_irqsave(&tdc->lock, flags); + if (list_empty(&tdc->pending_sg_req)) { + dev_err(tdc2dev(tdc), "No DMA request\n"); + goto end; + } + if (!tdc->busy) { + tdc_start_head_req(tdc); + + /* Continuous single mode: Configure next req */ + if (tdc->cyclic) { + /* + * Wait for 1 burst time for configure DMA for + * next transfer. + */ + udelay(tdc->tdma->chip_data->burst_time); + tdc_configure_next_head_desc(tdc); + } + } +end: + spin_unlock_irqrestore(&tdc->lock, flags); +} + +int tegra_dma_terminate_all(struct dma_chan *dc) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + const struct tegra_dma_ops *ops = tdc->tdma->ops; + struct tegra_dma_sg_req *sgreq; + struct tegra_dma_desc *dma_desc; + unsigned long flags; + unsigned long status; + unsigned long wcount; + bool was_busy; + + spin_lock_irqsave(&tdc->lock, flags); + if (list_empty(&tdc->pending_sg_req)) { + spin_unlock_irqrestore(&tdc->lock, flags); + return 0; + } + + if (!tdc->busy) + goto skip_dma_stop; + + /* Pause DMA before checking the queue status */ + ops->pause(tdc, true); + + status = ops->irq_status(tdc); + if (status) { + dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__); + tdc->isr_handler(tdc, true); + } + + wcount = ops->get_xfer_count(tdc); + + was_busy = tdc->busy; + ops->stop(tdc); + + if (!list_empty(&tdc->pending_sg_req) && was_busy) { + sgreq = list_first_entry(&tdc->pending_sg_req, + typeof(*sgreq), node); + sgreq->dma_desc->bytes_transferred += + get_current_xferred_count(sgreq, wcount); + } + ops->resume(tdc); + +skip_dma_stop: + tegra_dma_abort_all(tdc); + + while (!list_empty(&tdc->cb_desc)) { + dma_desc = list_first_entry(&tdc->cb_desc, + typeof(*dma_desc), cb_node); + list_del(&dma_desc->cb_node); + dma_desc->cb_count = 0; + } + spin_unlock_irqrestore(&tdc->lock, flags); + return 0; +} + +enum dma_status tegra_dma_tx_status(struct dma_chan *dc, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma_desc *dma_desc; + struct tegra_dma_sg_req *sg_req; + enum dma_status ret; + unsigned long flags; + unsigned int residual; + + ret = dma_cookie_status(dc, cookie, txstate); + if (ret == DMA_COMPLETE) + return ret; + + spin_lock_irqsave(&tdc->lock, flags); + + /* Check on wait_ack desc status */ + list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) { + if (dma_desc->txd.cookie == cookie) { + residual = dma_desc->bytes_requested - + (dma_desc->bytes_transferred % + dma_desc->bytes_requested); + dma_set_residue(txstate, residual); + ret = dma_desc->dma_status; + spin_unlock_irqrestore(&tdc->lock, flags); + return ret; + } + } + + /* Check in pending list */ + list_for_each_entry(sg_req, &tdc->pending_sg_req, node) { + dma_desc = sg_req->dma_desc; + if (dma_desc->txd.cookie == cookie) { + residual = dma_desc->bytes_requested - + (dma_desc->bytes_transferred % + dma_desc->bytes_requested); + dma_set_residue(txstate, residual); + ret = dma_desc->dma_status; + spin_unlock_irqrestore(&tdc->lock, flags); + return ret; + } + } + + dev_dbg(tdc2dev(tdc), "cookie %d does not found\n", cookie); + spin_unlock_irqrestore(&tdc->lock, flags); + return ret; +} + +struct dma_async_tx_descriptor *tegra_dma_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_dma_channel *tdc = to_tegra_dma_chan(dc); + const struct tegra_dma_ops *ops = tdc->tdma->ops; + struct tegra_dma_desc *dma_desc; + unsigned int i; + struct scatterlist *sg; + struct list_head req_list; + struct tegra_dma_sg_req sg_base, *sg_req = NULL; + + if (!tdc->config_init) { + dev_err(tdc2dev(tdc), "dma channel is not configured\n"); + return NULL; + } + if (sg_len < 1) { + dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len); + return NULL; + } + + if (ops->get_xfer_params_sg(tdc, &sg_base, direction, flags) < 0) + return NULL; + + INIT_LIST_HEAD(&req_list); + + dma_desc = tegra_dma_desc_get(tdc); + if (!dma_desc) { + dev_err(tdc2dev(tdc), "Dma descriptors not available\n"); + return NULL; + } + INIT_LIST_HEAD(&dma_desc->tx_list); + INIT_LIST_HEAD(&dma_desc->cb_node); + dma_desc->cb_count = 0; + dma_desc->bytes_requested = 0; + dma_desc->bytes_transferred = 0; + dma_desc->dma_status = DMA_IN_PROGRESS; + + /* Make transfer requests */ + for_each_sg(sgl, sg, sg_len, i) { + u32 len, mem; + + mem = sg_dma_address(sg); + len = sg_dma_len(sg); + + if ((len & 3) || (mem & 3) || + (len > tdc->tdma->chip_data->max_dma_count)) { + dev_err(tdc2dev(tdc), + "Dma length/memory address is not supported\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + + sg_req = tegra_dma_sg_req_get(tdc); + if (!sg_req) { + dev_err(tdc2dev(tdc), "Dma sg-req not available\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + + dma_desc->bytes_requested += len; + + ops->set_xfer_params(tdc, sg_req, &sg_base, direction, mem, + len); + sg_req->dma_desc = dma_desc; + + list_add_tail(&sg_req->node, &dma_desc->tx_list); + } + sg_req->last_sg = true; + if (flags & DMA_CTRL_ACK) + dma_desc->txd.flags = DMA_CTRL_ACK; + + /* + * Make sure that mode should not be conflicting with currently + * configured mode. + */ + if (!tdc->isr_handler) { + tdc->isr_handler = handle_once_dma_done; + tdc->cyclic = false; + } else { + if (tdc->cyclic) { + dev_err(tdc2dev(tdc), "DMA configured in cyclic mode\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + } + + return &dma_desc->txd; +} + +struct dma_async_tx_descriptor *tegra_dma_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_dma_channel *tdc = to_tegra_dma_chan(dc); + const struct tegra_dma_ops *ops = tdc->tdma->ops; + struct tegra_dma_desc *dma_desc = NULL; + struct tegra_dma_sg_req sg_base, *sg_req = NULL; + int len; + size_t remain_len; + dma_addr_t mem = buf_addr; + + if (!buf_len || !period_len) { + dev_err(tdc2dev(tdc), "Invalid buffer/period len\n"); + return NULL; + } + + if (!tdc->config_init) { + dev_err(tdc2dev(tdc), "DMA slave is not configured\n"); + return NULL; + } + + /* + * We allow to take more number of requests till DMA is + * not started. The driver will loop over all requests. + * Once DMA is started then new requests can be queued only after + * terminating the DMA. + */ + if (tdc->busy) { + dev_err(tdc2dev(tdc), "Request not allowed when dma running\n"); + return NULL; + } + + /* + * We only support cycle transfer when buf_len is multiple of + * period_len. + */ + if (buf_len % period_len) { + dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n"); + return NULL; + } + + len = period_len; + if ((len & 3) || (buf_addr & 3) || + (len > tdc->tdma->chip_data->max_dma_count)) { + dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n"); + return NULL; + } + + if (ops->get_xfer_params_cyclic(tdc, &sg_base, direction, flags) < 0) + return NULL; + + dma_desc = tegra_dma_desc_get(tdc); + if (!dma_desc) { + dev_err(tdc2dev(tdc), "not enough descriptors available\n"); + return NULL; + } + + INIT_LIST_HEAD(&dma_desc->tx_list); + INIT_LIST_HEAD(&dma_desc->cb_node); + dma_desc->cb_count = 0; + + dma_desc->bytes_transferred = 0; + dma_desc->bytes_requested = buf_len; + remain_len = buf_len; + + /* Split transfer equal to period size */ + while (remain_len) { + sg_req = tegra_dma_sg_req_get(tdc); + if (!sg_req) { + dev_err(tdc2dev(tdc), "Dma sg-req not available\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + + ops->set_xfer_params(tdc, sg_req, &sg_base, direction, mem, + len); + sg_req->dma_desc = dma_desc; + + list_add_tail(&sg_req->node, &dma_desc->tx_list); + remain_len -= len; + mem += len; + } + sg_req->last_sg = true; + if (flags & DMA_CTRL_ACK) + dma_desc->txd.flags = DMA_CTRL_ACK; + + /* + * Make sure that mode should not be conflicting with currently + * configured mode. + */ + if (!tdc->isr_handler) { + tdc->isr_handler = handle_cont_sngl_cycle_dma_done; + tdc->cyclic = true; + } else { + if (!tdc->cyclic) { + dev_err(tdc2dev(tdc), "DMA configuration conflict\n"); + tegra_dma_desc_put(tdc, dma_desc); + return NULL; + } + } + + return &dma_desc->txd; +} + +int tegra_dma_alloc_chan_resources(struct dma_chan *dc) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma *tdma = tdc->tdma; + + dma_cookie_init(&tdc->dma_chan); + tdc->config_init = false; + + return pm_runtime_get_sync(tdma->dev); +} + +void tegra_dma_free_chan_resources(struct dma_chan *dc) +{ + struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); + struct tegra_dma *tdma = tdc->tdma; + + struct tegra_dma_desc *dma_desc; + struct tegra_dma_sg_req *sg_req; + struct list_head dma_desc_list; + struct list_head sg_req_list; + unsigned long flags; + + INIT_LIST_HEAD(&dma_desc_list); + INIT_LIST_HEAD(&sg_req_list); + + dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id); + + if (tdc->busy) + tegra_dma_terminate_all(dc); + + spin_lock_irqsave(&tdc->lock, flags); + list_splice_init(&tdc->pending_sg_req, &sg_req_list); + list_splice_init(&tdc->free_sg_req, &sg_req_list); + list_splice_init(&tdc->free_dma_desc, &dma_desc_list); + INIT_LIST_HEAD(&tdc->cb_desc); + tdc->config_init = false; + tdc->isr_handler = NULL; + spin_unlock_irqrestore(&tdc->lock, flags); + + while (!list_empty(&dma_desc_list)) { + dma_desc = list_first_entry(&dma_desc_list, + typeof(*dma_desc), node); + list_del(&dma_desc->node); + kfree(dma_desc); + } + + while (!list_empty(&sg_req_list)) { + sg_req = list_first_entry(&sg_req_list, typeof(*sg_req), node); + list_del(&sg_req->node); + kfree(sg_req); + } + pm_runtime_put(tdma->dev); + + tdc->slave_id = 0; +} diff --git a/drivers/dma/tegra-common.h b/drivers/dma/tegra-common.h new file mode 100644 index 000000000000..e0d4d2b13cb8 --- /dev/null +++ b/drivers/dma/tegra-common.h @@ -0,0 +1,226 @@ +/* + * 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/>. + */ + +/* + * tegra_dma_chip_data Tegra chip specific DMA data + * @nr_channels: Number of channels available in the controller. + * @channel_reg_size: Channel register size/stride. + * @max_dma_count: Maximum DMA transfer count supported by DMA controller. + * @support_channel_pause: Support channel wise pause of dma. + * @support_separate_wcount_reg: Support separate word count register. + */ +struct tegra_dma_chip_data { + int burst_time; + int nr_channels; + int channel_reg_size; + int max_dma_count; + bool support_channel_pause; + bool support_separate_wcount_reg; +}; + +/* + * DMA channel registers + */ +struct tegra_dma_channel_regs { + unsigned long csr; + unsigned long ahb_ptr; + unsigned long apb_ptr; + unsigned long ahb_seq; + unsigned long apb_seq; + unsigned long wcount; +}; + +/* + * tegra_dma_sg_req: Dma request details to configure hardware. This + * contains the details for one transfer to configure DMA hw. + * The client's request for data transfer can be broken into multiple + * sub-transfer as per requester details and hw support. + * This sub transfer get added in the list of transfer and point to Tegra + * DMA descriptor which manages the transfer details. + */ +struct tegra_dma_sg_req { + struct tegra_dma_channel_regs ch_regs; + int req_len; + bool configured; + bool last_sg; + struct list_head node; + struct tegra_dma_desc *dma_desc; +}; + +/* + * tegra_dma_desc: Tegra DMA descriptors which manages the client requests. + * This descriptor keep track of transfer status, callbacks and request + * counts etc. + */ +struct tegra_dma_desc { + struct dma_async_tx_descriptor txd; + int bytes_requested; + int bytes_transferred; + enum dma_status dma_status; + struct list_head node; + struct list_head tx_list; + struct list_head cb_node; + int cb_count; +}; + +struct tegra_dma_channel; + +typedef void (*dma_isr_handler)(struct tegra_dma_channel *tdc, + bool to_terminate); + +/* + * tegra_dma_channel: Channel specific information + */ +struct tegra_dma_channel { + struct dma_chan dma_chan; + char name[30]; + bool config_init; + int id; + int irq; + void __iomem *chan_addr; + spinlock_t lock; + bool busy; + struct tegra_dma *tdma; + bool cyclic; + + /* Different lists for managing the requests */ + struct list_head free_sg_req; + struct list_head pending_sg_req; + struct list_head free_dma_desc; + struct list_head cb_desc; + + /* ISR handler and tasklet for bottom half of isr handling */ + dma_isr_handler isr_handler; + struct tasklet_struct tasklet; + + /* Channel-slave specific configuration */ + unsigned int slave_id; + struct dma_slave_config dma_sconfig; + struct tegra_dma_channel_regs channel_reg; +}; + +/* + * tegra_dma_ops: Tegra DMA function table + */ +struct tegra_dma_ops { + u32 (*get_xfer_count)(struct tegra_dma_channel *tdc); + int (*get_xfer_params_cyclic)(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *sg_req, + enum dma_transfer_direction direction, + unsigned int flags); + int (*get_xfer_params_sg)(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *sg_req, + enum dma_transfer_direction direction, + unsigned int flags); + u32 (*irq_clear)(struct tegra_dma_channel *tdc); + u32 (*irq_status)(struct tegra_dma_channel *tdc); + void (*pause)(struct tegra_dma_channel *tdc, + bool wait_for_burst_complete); + void (*program)(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *sg_req); + void (*resume)(struct tegra_dma_channel *tdc); + void (*set_xfer_params)(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *sg_req, + struct tegra_dma_sg_req *sg_base, + enum dma_transfer_direction direction, + u32 mem, u32 len); + void (*start)(struct tegra_dma_channel *tdc, + struct tegra_dma_sg_req *sg_req); + void (*stop)(struct tegra_dma_channel *tdc); +}; + +/* + * tegra_dma: Tegra DMA specific information + */ +struct tegra_dma { + struct dma_device dma_dev; + struct device *dev; + struct clk *dma_clk; + struct reset_control *rst; + spinlock_t global_lock; + void __iomem *base_addr; + const struct tegra_dma_chip_data *chip_data; + const struct tegra_dma_ops *ops; + + /* + * Counter for managing global pausing of the DMA controller. + * Only applicable for devices that don't support individual + * channel pausing. + */ + u32 global_pause_count; + + /* Some register need to be cache before suspend */ + u32 reg_gen; + + /* Last member of the structure */ + struct tegra_dma_channel channels[0]; +}; + +static inline void tdma_write(struct tegra_dma *tdma, u32 reg, u32 val) +{ + writel(val, tdma->base_addr + reg); +} + +static inline u32 tdma_read(struct tegra_dma *tdma, u32 reg) +{ + return readl(tdma->base_addr + reg); +} + +static inline void tdc_write(struct tegra_dma_channel *tdc, + u32 reg, u32 val) +{ + writel(val, tdc->chan_addr + reg); +} + +static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg) +{ + return readl(tdc->chan_addr + reg); +} + +static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc) +{ + return container_of(dc, struct tegra_dma_channel, dma_chan); +} + +static inline struct tegra_dma_desc *txd_to_tegra_dma_desc( + struct dma_async_tx_descriptor *td) +{ + return container_of(td, struct tegra_dma_desc, txd); +} + +static inline struct device *tdc2dev(struct tegra_dma_channel *tdc) +{ + return &tdc->dma_chan.dev->device; +} + +irqreturn_t tegra_dma_isr(int irq, void *dev_id); +void tegra_dma_issue_pending(struct dma_chan *dc); +int tegra_dma_slave_config(struct dma_chan *dc, + struct dma_slave_config *sconfig); +void tegra_dma_tasklet(unsigned long data); +enum dma_status tegra_dma_tx_status(struct dma_chan *dc, dma_cookie_t cookie, + struct dma_tx_state *txstate); +int tegra_dma_terminate_all(struct dma_chan *dc); +struct dma_async_tx_descriptor *tegra_dma_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 dma_async_tx_descriptor *tegra_dma_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); +int tegra_dma_alloc_chan_resources(struct dma_chan *dc); +void tegra_dma_free_chan_resources(struct dma_chan *dc); diff --git a/drivers/dma/tegra20-apb-dma.c b/drivers/dma/tegra20-apb-dma.c index 7947acdf23db..0895732aaa28 100644 --- a/drivers/dma/tegra20-apb-dma.c +++ b/drivers/dma/tegra20-apb-dma.c @@ -38,6 +38,8 @@ #include "dmaengine.h" +#include "tegra-common.h" + #define TEGRA_APBDMA_GENERAL 0x0 #define TEGRA_APBDMA_GENERAL_ENABLE BIT(31) @@ -114,279 +116,9 @@ /* Channel base address offset from APBDMA base address */ #define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000 -struct tegra_dma; - -/* - * tegra_dma_chip_data Tegra chip specific DMA data - * @nr_channels: Number of channels available in the controller. - * @channel_reg_size: Channel register size/stride. - * @max_dma_count: Maximum DMA transfer count supported by DMA controller. - * @support_channel_pause: Support channel wise pause of dma. - * @support_separate_wcount_reg: Support separate word count register. - */ -struct tegra_dma_chip_data { - int nr_channels; - int channel_reg_size; - int max_dma_count; - bool support_channel_pause; - bool support_separate_wcount_reg; -}; - -/* DMA channel registers */ -struct tegra_dma_channel_regs { - unsigned long csr; - unsigned long ahb_ptr; - unsigned long apb_ptr; - unsigned long ahb_seq; - unsigned long apb_seq; - unsigned long wcount; -}; - -/* - * tegra_dma_sg_req: Dma request details to configure hardware. This - * contains the details for one transfer to configure DMA hw. - * The client's request for data transfer can be broken into multiple - * sub-transfer as per requester details and hw support. - * This sub transfer get added in the list of transfer and point to Tegra - * DMA descriptor which manages the transfer details. - */ -struct tegra_dma_sg_req { - struct tegra_dma_channel_regs ch_regs; - int req_len; - bool configured; - bool last_sg; - struct list_head node; - struct tegra_dma_desc *dma_desc; -}; - -/* - * tegra_dma_desc: Tegra DMA descriptors which manages the client requests. - * This descriptor keep track of transfer status, callbacks and request - * counts etc. - */ -struct tegra_dma_desc { - struct dma_async_tx_descriptor txd; - int bytes_requested; - int bytes_transferred; - enum dma_status dma_status; - struct list_head node; - struct list_head tx_list; - struct list_head cb_node; - int cb_count; -}; - -struct tegra_dma_channel; - -typedef void (*dma_isr_handler)(struct tegra_dma_channel *tdc, - bool to_terminate); - -/* tegra_dma_channel: Channel specific information */ -struct tegra_dma_channel { - struct dma_chan dma_chan; - char name[30]; - bool config_init; - int id; - int irq; - void __iomem *chan_addr; - spinlock_t lock; - bool busy; - struct tegra_dma *tdma; - bool cyclic; - - /* Different lists for managing the requests */ - struct list_head free_sg_req; - struct list_head pending_sg_req; - struct list_head free_dma_desc; - struct list_head cb_desc; - - /* ISR handler and tasklet for bottom half of isr handling */ - dma_isr_handler isr_handler; - struct tasklet_struct tasklet; - - /* Channel-slave specific configuration */ - unsigned int slave_id; - struct dma_slave_config dma_sconfig; - struct tegra_dma_channel_regs channel_reg; -}; - -struct tegra_dma_ops { - u32 (*get_xfer_count)(struct tegra_dma_channel *tdc); - int (*get_xfer_params_cyclic)(struct tegra_dma_channel *tdc, - struct tegra_dma_sg_req *sg_req, - enum dma_transfer_direction direction, - unsigned int flags); - int (*get_xfer_params_sg)(struct tegra_dma_channel *tdc, - struct tegra_dma_sg_req *sg_req, - enum dma_transfer_direction direction, - unsigned int flags); - u32 (*irq_clear)(struct tegra_dma_channel *tdc); - u32 (*irq_status)(struct tegra_dma_channel *tdc); - void (*pause)(struct tegra_dma_channel *tdc, - bool wait_for_burst_complete); - void (*program)(struct tegra_dma_channel *tdc, - struct tegra_dma_sg_req *sg_req); - void (*resume)(struct tegra_dma_channel *tdc); - void (*set_xfer_params)(struct tegra_dma_channel *tdc, - struct tegra_dma_sg_req *sg_req, - struct tegra_dma_sg_req *sg_base, - enum dma_transfer_direction direction, - u32 mem, u32 len); - void (*start)(struct tegra_dma_channel *tdc, - struct tegra_dma_sg_req *sg_req); - void (*stop)(struct tegra_dma_channel *tdc); -}; - -/* tegra_dma: Tegra DMA specific information */ -struct tegra_dma { - struct dma_device dma_dev; - struct device *dev; - struct clk *dma_clk; - struct reset_control *rst; - spinlock_t global_lock; - void __iomem *base_addr; - const struct tegra_dma_chip_data *chip_data; - const struct tegra_dma_ops *ops; - - /* - * Counter for managing global pausing of the DMA controller. - * Only applicable for devices that don't support individual - * channel pausing. - */ - u32 global_pause_count; - - /* Some register need to be cache before suspend */ - u32 reg_gen; - - /* Last member of the structure */ - struct tegra_dma_channel channels[0]; -}; - -static inline void tdma_write(struct tegra_dma *tdma, u32 reg, u32 val) -{ - writel(val, tdma->base_addr + reg); -} - -static inline u32 tdma_read(struct tegra_dma *tdma, u32 reg) -{ - return readl(tdma->base_addr + reg); -} - -static inline void tdc_write(struct tegra_dma_channel *tdc, - u32 reg, u32 val) -{ - writel(val, tdc->chan_addr + reg); -} - -static inline u32 tdc_read(struct tegra_dma_channel *tdc, u32 reg) -{ - return readl(tdc->chan_addr + reg); -} - -static inline struct tegra_dma_channel *to_tegra_dma_chan(struct dma_chan *dc) -{ - return container_of(dc, struct tegra_dma_channel, dma_chan); -} - -static inline struct tegra_dma_desc *txd_to_tegra_dma_desc( - struct dma_async_tx_descriptor *td) -{ - return container_of(td, struct tegra_dma_desc, txd); -} - -static inline struct device *tdc2dev(struct tegra_dma_channel *tdc) -{ - return &tdc->dma_chan.dev->device; -} - -static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *tx); static int tegra_dma_runtime_suspend(struct device *dev); static int tegra_dma_runtime_resume(struct device *dev); -/* Get DMA desc from free list, if not there then allocate it. */ -static struct tegra_dma_desc *tegra_dma_desc_get( - struct tegra_dma_channel *tdc) -{ - struct tegra_dma_desc *dma_desc; - unsigned long flags; - - spin_lock_irqsave(&tdc->lock, flags); - - /* Do not allocate if desc are waiting for ack */ - list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) { - if (async_tx_test_ack(&dma_desc->txd)) { - list_del(&dma_desc->node); - spin_unlock_irqrestore(&tdc->lock, flags); - dma_desc->txd.flags = 0; - return dma_desc; - } - } - - spin_unlock_irqrestore(&tdc->lock, flags); - - /* Allocate DMA desc */ - dma_desc = kzalloc(sizeof(*dma_desc), GFP_ATOMIC); - if (!dma_desc) { - dev_err(tdc2dev(tdc), "dma_desc alloc failed\n"); - return NULL; - } - - dma_async_tx_descriptor_init(&dma_desc->txd, &tdc->dma_chan); - dma_desc->txd.tx_submit = tegra_dma_tx_submit; - dma_desc->txd.flags = 0; - return dma_desc; -} - -static void tegra_dma_desc_put(struct tegra_dma_channel *tdc, - struct tegra_dma_desc *dma_desc) -{ - unsigned long flags; - - spin_lock_irqsave(&tdc->lock, flags); - if (!list_empty(&dma_desc->tx_list)) - list_splice_init(&dma_desc->tx_list, &tdc->free_sg_req); - list_add_tail(&dma_desc->node, &tdc->free_dma_desc); - spin_unlock_irqrestore(&tdc->lock, flags); -} - -static struct tegra_dma_sg_req *tegra_dma_sg_req_get( - struct tegra_dma_channel *tdc) -{ - struct tegra_dma_sg_req *sg_req = NULL; - unsigned long flags; - - spin_lock_irqsave(&tdc->lock, flags); - if (!list_empty(&tdc->free_sg_req)) { - sg_req = list_first_entry(&tdc->free_sg_req, - typeof(*sg_req), node); - list_del(&sg_req->node); - spin_unlock_irqrestore(&tdc->lock, flags); - return sg_req; - } - spin_unlock_irqrestore(&tdc->lock, flags); - - sg_req = kzalloc(sizeof(struct tegra_dma_sg_req), GFP_ATOMIC); - if (!sg_req) - dev_err(tdc2dev(tdc), "sg_req alloc failed\n"); - return sg_req; -} - -static int tegra_dma_slave_config(struct dma_chan *dc, - struct dma_slave_config *sconfig) -{ - struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); - - if (!list_empty(&tdc->pending_sg_req)) { - dev_err(tdc2dev(tdc), "Configuration not allowed\n"); - return -EBUSY; - } - - memcpy(&tdc->dma_sconfig, sconfig, sizeof(*sconfig)); - if (!tdc->slave_id) - tdc->slave_id = sconfig->slave_id; - tdc->config_init = true; - return 0; -} - static u32 tegra_dma_get_xfer_count(struct tegra_dma_channel *tdc) { u32 wcount; @@ -409,7 +141,7 @@ static void tegra_dma_global_pause(struct tegra_dma_channel *tdc, if (tdc->tdma->global_pause_count == 0) { tdma_write(tdma, TEGRA_APBDMA_GENERAL, 0); if (wait_for_burst_complete) - udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME); + udelay(tdma->chip_data->burst_time); } tdc->tdma->global_pause_count++; @@ -475,7 +207,7 @@ static void tegra_dma_pause(struct tegra_dma_channel *tdc, tdc_write(tdc, TEGRA_APBDMA_CHAN_CSRE, TEGRA_APBDMA_CHAN_CSRE_PAUSE); if (wait_for_burst_complete) - udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME); + udelay(tdma->chip_data->burst_time); } else { tegra_dma_global_pause(tdc, wait_for_burst_complete); } @@ -529,383 +261,6 @@ static void tegra_dma_start(struct tegra_dma_channel *tdc, ch_regs->csr | TEGRA_APBDMA_CSR_ENB); } -static void tegra_dma_configure_for_next(struct tegra_dma_channel *tdc, - struct tegra_dma_sg_req *nsg_req) -{ - const struct tegra_dma_ops *ops = tdc->tdma->ops; - unsigned long status; - - /* - * The DMA controller reloads the new configuration for next transfer - * after last burst of current transfer completes. - * If there is no IEC status then this makes sure that last burst - * has not be completed. There may be case that last burst is on - * flight and so it can complete but because DMA is paused, it - * will not generates interrupt as well as not reload the new - * configuration. - * If there is already IEC status then interrupt handler need to - * load new configuration. - */ - ops->pause(tdc, false); - status = ops->irq_status(tdc); - - /* - * If interrupt is pending then do nothing as the ISR will handle - * the programing for new request. - */ - if (status) { - dev_err(tdc2dev(tdc), - "Skipping new configuration as interrupt is pending\n"); - ops->resume(tdc); - return; - } - - /* Safe to program new configuration */ - ops->program(tdc, nsg_req); - ops->resume(tdc); -} - -static void tdc_start_head_req(struct tegra_dma_channel *tdc) -{ - const struct tegra_dma_ops *ops = tdc->tdma->ops; - struct tegra_dma_sg_req *sg_req; - - if (list_empty(&tdc->pending_sg_req)) - return; - - sg_req = list_first_entry(&tdc->pending_sg_req, - typeof(*sg_req), node); - ops->start(tdc, sg_req); - sg_req->configured = true; - tdc->busy = true; -} - -static void tdc_configure_next_head_desc(struct tegra_dma_channel *tdc) -{ - struct tegra_dma_sg_req *hsgreq; - struct tegra_dma_sg_req *hnsgreq; - - if (list_empty(&tdc->pending_sg_req)) - return; - - hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node); - if (!list_is_last(&hsgreq->node, &tdc->pending_sg_req)) { - hnsgreq = list_first_entry(&hsgreq->node, - typeof(*hnsgreq), node); - tegra_dma_configure_for_next(tdc, hnsgreq); - } -} - -static inline int get_current_xferred_count(struct tegra_dma_sg_req *sg_req, - unsigned long wcount) -{ - return sg_req->req_len - wcount; -} - -static void tegra_dma_abort_all(struct tegra_dma_channel *tdc) -{ - struct tegra_dma_sg_req *sgreq; - struct tegra_dma_desc *dma_desc; - - while (!list_empty(&tdc->pending_sg_req)) { - sgreq = list_first_entry(&tdc->pending_sg_req, - typeof(*sgreq), node); - list_move_tail(&sgreq->node, &tdc->free_sg_req); - if (sgreq->last_sg) { - dma_desc = sgreq->dma_desc; - dma_desc->dma_status = DMA_ERROR; - list_add_tail(&dma_desc->node, &tdc->free_dma_desc); - - /* Add in cb list if it is not there. */ - if (!dma_desc->cb_count) - list_add_tail(&dma_desc->cb_node, - &tdc->cb_desc); - dma_desc->cb_count++; - } - } - tdc->isr_handler = NULL; -} - -static bool handle_continuous_head_request(struct tegra_dma_channel *tdc, - struct tegra_dma_sg_req *last_sg_req, bool to_terminate) -{ - const struct tegra_dma_ops *ops = tdc->tdma->ops; - struct tegra_dma_sg_req *hsgreq = NULL; - - if (list_empty(&tdc->pending_sg_req)) { - dev_err(tdc2dev(tdc), "Dma is running without req\n"); - ops->stop(tdc); - return false; - } - - /* - * Check that head req on list should be in flight. - * If it is not in flight then abort transfer as - * looping of transfer can not continue. - */ - hsgreq = list_first_entry(&tdc->pending_sg_req, typeof(*hsgreq), node); - if (!hsgreq->configured) { - ops->stop(tdc); - dev_err(tdc2dev(tdc), "Error in dma transfer, aborting dma\n"); - tegra_dma_abort_all(tdc); - return false; - } - - /* Configure next request */ - if (!to_terminate) - tdc_configure_next_head_desc(tdc); - return true; -} - -static void handle_once_dma_done(struct tegra_dma_channel *tdc, - bool to_terminate) -{ - struct tegra_dma_sg_req *sgreq; - struct tegra_dma_desc *dma_desc; - - tdc->busy = false; - sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node); - dma_desc = sgreq->dma_desc; - dma_desc->bytes_transferred += sgreq->req_len; - - list_del(&sgreq->node); - if (sgreq->last_sg) { - dma_desc->dma_status = DMA_COMPLETE; - dma_cookie_complete(&dma_desc->txd); - if (!dma_desc->cb_count) - list_add_tail(&dma_desc->cb_node, &tdc->cb_desc); - dma_desc->cb_count++; - list_add_tail(&dma_desc->node, &tdc->free_dma_desc); - } - list_add_tail(&sgreq->node, &tdc->free_sg_req); - - /* Do not start DMA if it is going to be terminate */ - if (to_terminate || list_empty(&tdc->pending_sg_req)) - return; - - tdc_start_head_req(tdc); -} - -static void handle_cont_sngl_cycle_dma_done(struct tegra_dma_channel *tdc, - bool to_terminate) -{ - struct tegra_dma_sg_req *sgreq; - struct tegra_dma_desc *dma_desc; - bool st; - - sgreq = list_first_entry(&tdc->pending_sg_req, typeof(*sgreq), node); - dma_desc = sgreq->dma_desc; - dma_desc->bytes_transferred += sgreq->req_len; - - /* Callback need to be call */ - if (!dma_desc->cb_count) - list_add_tail(&dma_desc->cb_node, &tdc->cb_desc); - dma_desc->cb_count++; - - /* If not last req then put at end of pending list */ - if (!list_is_last(&sgreq->node, &tdc->pending_sg_req)) { - list_move_tail(&sgreq->node, &tdc->pending_sg_req); - sgreq->configured = false; - st = handle_continuous_head_request(tdc, sgreq, to_terminate); - if (!st) - dma_desc->dma_status = DMA_ERROR; - } -} - -static void tegra_dma_tasklet(unsigned long data) -{ - struct tegra_dma_channel *tdc = (struct tegra_dma_channel *)data; - dma_async_tx_callback callback = NULL; - void *callback_param = NULL; - struct tegra_dma_desc *dma_desc; - unsigned long flags; - int cb_count; - - spin_lock_irqsave(&tdc->lock, flags); - while (!list_empty(&tdc->cb_desc)) { - dma_desc = list_first_entry(&tdc->cb_desc, - typeof(*dma_desc), cb_node); - list_del(&dma_desc->cb_node); - callback = dma_desc->txd.callback; - callback_param = dma_desc->txd.callback_param; - cb_count = dma_desc->cb_count; - dma_desc->cb_count = 0; - spin_unlock_irqrestore(&tdc->lock, flags); - while (cb_count-- && callback) - callback(callback_param); - spin_lock_irqsave(&tdc->lock, flags); - } - spin_unlock_irqrestore(&tdc->lock, flags); -} - -static irqreturn_t tegra_dma_isr(int irq, void *dev_id) -{ - struct tegra_dma_channel *tdc = dev_id; - const struct tegra_dma_ops *ops = tdc->tdma->ops; - unsigned long status; - unsigned long flags; - - spin_lock_irqsave(&tdc->lock, flags); - - status = ops->irq_clear(tdc); - if (status) { - tdc->isr_handler(tdc, false); - tasklet_schedule(&tdc->tasklet); - spin_unlock_irqrestore(&tdc->lock, flags); - return IRQ_HANDLED; - } - - spin_unlock_irqrestore(&tdc->lock, flags); - dev_info(tdc2dev(tdc), - "Interrupt already served status 0x%08lx\n", status); - return IRQ_NONE; -} - -static dma_cookie_t tegra_dma_tx_submit(struct dma_async_tx_descriptor *txd) -{ - struct tegra_dma_desc *dma_desc = txd_to_tegra_dma_desc(txd); - struct tegra_dma_channel *tdc = to_tegra_dma_chan(txd->chan); - unsigned long flags; - dma_cookie_t cookie; - - spin_lock_irqsave(&tdc->lock, flags); - dma_desc->dma_status = DMA_IN_PROGRESS; - cookie = dma_cookie_assign(&dma_desc->txd); - list_splice_tail_init(&dma_desc->tx_list, &tdc->pending_sg_req); - spin_unlock_irqrestore(&tdc->lock, flags); - return cookie; -} - -static void tegra_dma_issue_pending(struct dma_chan *dc) -{ - struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); - unsigned long flags; - - spin_lock_irqsave(&tdc->lock, flags); - if (list_empty(&tdc->pending_sg_req)) { - dev_err(tdc2dev(tdc), "No DMA request\n"); - goto end; - } - if (!tdc->busy) { - tdc_start_head_req(tdc); - - /* Continuous single mode: Configure next req */ - if (tdc->cyclic) { - /* - * Wait for 1 burst time for configure DMA for - * next transfer. - */ - udelay(TEGRA_APBDMA_BURST_COMPLETE_TIME); - tdc_configure_next_head_desc(tdc); - } - } -end: - spin_unlock_irqrestore(&tdc->lock, flags); -} - -static int tegra_dma_terminate_all(struct dma_chan *dc) -{ - struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); - const struct tegra_dma_ops *ops = tdc->tdma->ops; - struct tegra_dma_sg_req *sgreq; - struct tegra_dma_desc *dma_desc; - unsigned long flags; - unsigned long status; - unsigned long wcount; - bool was_busy; - - spin_lock_irqsave(&tdc->lock, flags); - if (list_empty(&tdc->pending_sg_req)) { - spin_unlock_irqrestore(&tdc->lock, flags); - return 0; - } - - if (!tdc->busy) - goto skip_dma_stop; - - /* Pause DMA before checking the queue status */ - ops->pause(tdc, true); - - status = ops->irq_status(tdc); - if (status) { - dev_dbg(tdc2dev(tdc), "%s():handling isr\n", __func__); - tdc->isr_handler(tdc, true); - } - - wcount = ops->get_xfer_count(tdc); - - was_busy = tdc->busy; - ops->stop(tdc); - - if (!list_empty(&tdc->pending_sg_req) && was_busy) { - sgreq = list_first_entry(&tdc->pending_sg_req, - typeof(*sgreq), node); - sgreq->dma_desc->bytes_transferred += - get_current_xferred_count(sgreq, wcount); - } - ops->resume(tdc); - -skip_dma_stop: - tegra_dma_abort_all(tdc); - - while (!list_empty(&tdc->cb_desc)) { - dma_desc = list_first_entry(&tdc->cb_desc, - typeof(*dma_desc), cb_node); - list_del(&dma_desc->cb_node); - dma_desc->cb_count = 0; - } - spin_unlock_irqrestore(&tdc->lock, flags); - return 0; -} - -static enum dma_status tegra_dma_tx_status(struct dma_chan *dc, - dma_cookie_t cookie, struct dma_tx_state *txstate) -{ - struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); - struct tegra_dma_desc *dma_desc; - struct tegra_dma_sg_req *sg_req; - enum dma_status ret; - unsigned long flags; - unsigned int residual; - - ret = dma_cookie_status(dc, cookie, txstate); - if (ret == DMA_COMPLETE) - return ret; - - spin_lock_irqsave(&tdc->lock, flags); - - /* Check on wait_ack desc status */ - list_for_each_entry(dma_desc, &tdc->free_dma_desc, node) { - if (dma_desc->txd.cookie == cookie) { - residual = dma_desc->bytes_requested - - (dma_desc->bytes_transferred % - dma_desc->bytes_requested); - dma_set_residue(txstate, residual); - ret = dma_desc->dma_status; - spin_unlock_irqrestore(&tdc->lock, flags); - return ret; - } - } - - /* Check in pending list */ - list_for_each_entry(sg_req, &tdc->pending_sg_req, node) { - dma_desc = sg_req->dma_desc; - if (dma_desc->txd.cookie == cookie) { - residual = dma_desc->bytes_requested - - (dma_desc->bytes_transferred % - dma_desc->bytes_requested); - dma_set_residue(txstate, residual); - ret = dma_desc->dma_status; - spin_unlock_irqrestore(&tdc->lock, flags); - return ret; - } - } - - dev_dbg(tdc2dev(tdc), "cookie %d does not found\n", cookie); - spin_unlock_irqrestore(&tdc->lock, flags); - return ret; -} - static inline int get_bus_width(struct tegra_dma_channel *tdc, enum dma_slave_buswidth slave_bw) { @@ -1063,259 +418,6 @@ static void tegra_dma_set_xfer_params(struct tegra_dma_channel *tdc, sg_req->req_len = len; } -static struct dma_async_tx_descriptor *tegra_dma_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_dma_channel *tdc = to_tegra_dma_chan(dc); - const struct tegra_dma_ops *ops = tdc->tdma->ops; - struct tegra_dma_desc *dma_desc; - unsigned int i; - struct scatterlist *sg; - struct list_head req_list; - struct tegra_dma_sg_req sg_base, *sg_req = NULL; - - if (!tdc->config_init) { - dev_err(tdc2dev(tdc), "dma channel is not configured\n"); - return NULL; - } - if (sg_len < 1) { - dev_err(tdc2dev(tdc), "Invalid segment length %d\n", sg_len); - return NULL; - } - - if (ops->get_xfer_params_sg(tdc, &sg_base, direction, flags) < 0) - return NULL; - - INIT_LIST_HEAD(&req_list); - - dma_desc = tegra_dma_desc_get(tdc); - if (!dma_desc) { - dev_err(tdc2dev(tdc), "Dma descriptors not available\n"); - return NULL; - } - INIT_LIST_HEAD(&dma_desc->tx_list); - INIT_LIST_HEAD(&dma_desc->cb_node); - dma_desc->cb_count = 0; - dma_desc->bytes_requested = 0; - dma_desc->bytes_transferred = 0; - dma_desc->dma_status = DMA_IN_PROGRESS; - - /* Make transfer requests */ - for_each_sg(sgl, sg, sg_len, i) { - u32 len, mem; - - mem = sg_dma_address(sg); - len = sg_dma_len(sg); - - if ((len & 3) || (mem & 3) || - (len > tdc->tdma->chip_data->max_dma_count)) { - dev_err(tdc2dev(tdc), - "Dma length/memory address is not supported\n"); - tegra_dma_desc_put(tdc, dma_desc); - return NULL; - } - - sg_req = tegra_dma_sg_req_get(tdc); - if (!sg_req) { - dev_err(tdc2dev(tdc), "Dma sg-req not available\n"); - tegra_dma_desc_put(tdc, dma_desc); - return NULL; - } - - dma_desc->bytes_requested += len; - - ops->set_xfer_params(tdc, sg_req, &sg_base, direction, mem, - len); - sg_req->dma_desc = dma_desc; - - list_add_tail(&sg_req->node, &dma_desc->tx_list); - } - sg_req->last_sg = true; - if (flags & DMA_CTRL_ACK) - dma_desc->txd.flags = DMA_CTRL_ACK; - - /* - * Make sure that mode should not be conflicting with currently - * configured mode. - */ - if (!tdc->isr_handler) { - tdc->isr_handler = handle_once_dma_done; - tdc->cyclic = false; - } else { - if (tdc->cyclic) { - dev_err(tdc2dev(tdc), "DMA configured in cyclic mode\n"); - tegra_dma_desc_put(tdc, dma_desc); - return NULL; - } - } - - return &dma_desc->txd; -} - -static struct dma_async_tx_descriptor *tegra_dma_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_dma_channel *tdc = to_tegra_dma_chan(dc); - const struct tegra_dma_ops *ops = tdc->tdma->ops; - struct tegra_dma_desc *dma_desc = NULL; - struct tegra_dma_sg_req sg_base, *sg_req = NULL; - int len; - size_t remain_len; - dma_addr_t mem = buf_addr; - - if (!buf_len || !period_len) { - dev_err(tdc2dev(tdc), "Invalid buffer/period len\n"); - return NULL; - } - - if (!tdc->config_init) { - dev_err(tdc2dev(tdc), "DMA slave is not configured\n"); - return NULL; - } - - /* - * We allow to take more number of requests till DMA is - * not started. The driver will loop over all requests. - * Once DMA is started then new requests can be queued only after - * terminating the DMA. - */ - if (tdc->busy) { - dev_err(tdc2dev(tdc), "Request not allowed when dma running\n"); - return NULL; - } - - /* - * We only support cycle transfer when buf_len is multiple of - * period_len. - */ - if (buf_len % period_len) { - dev_err(tdc2dev(tdc), "buf_len is not multiple of period_len\n"); - return NULL; - } - - len = period_len; - if ((len & 3) || (buf_addr & 3) || - (len > tdc->tdma->chip_data->max_dma_count)) { - dev_err(tdc2dev(tdc), "Req len/mem address is not correct\n"); - return NULL; - } - - if (ops->get_xfer_params_cyclic(tdc, &sg_base, direction, flags) < 0) - return NULL; - - dma_desc = tegra_dma_desc_get(tdc); - if (!dma_desc) { - dev_err(tdc2dev(tdc), "not enough descriptors available\n"); - return NULL; - } - - INIT_LIST_HEAD(&dma_desc->tx_list); - INIT_LIST_HEAD(&dma_desc->cb_node); - dma_desc->cb_count = 0; - - dma_desc->bytes_transferred = 0; - dma_desc->bytes_requested = buf_len; - remain_len = buf_len; - - /* Split transfer equal to period size */ - while (remain_len) { - sg_req = tegra_dma_sg_req_get(tdc); - if (!sg_req) { - dev_err(tdc2dev(tdc), "Dma sg-req not available\n"); - tegra_dma_desc_put(tdc, dma_desc); - return NULL; - } - - ops->set_xfer_params(tdc, sg_req, &sg_base, direction, mem, - len); - sg_req->dma_desc = dma_desc; - - list_add_tail(&sg_req->node, &dma_desc->tx_list); - remain_len -= len; - mem += len; - } - sg_req->last_sg = true; - if (flags & DMA_CTRL_ACK) - dma_desc->txd.flags = DMA_CTRL_ACK; - - /* - * Make sure that mode should not be conflicting with currently - * configured mode. - */ - if (!tdc->isr_handler) { - tdc->isr_handler = handle_cont_sngl_cycle_dma_done; - tdc->cyclic = true; - } else { - if (!tdc->cyclic) { - dev_err(tdc2dev(tdc), "DMA configuration conflict\n"); - tegra_dma_desc_put(tdc, dma_desc); - return NULL; - } - } - - return &dma_desc->txd; -} - -static int tegra_dma_alloc_chan_resources(struct dma_chan *dc) -{ - struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); - struct tegra_dma *tdma = tdc->tdma; - - dma_cookie_init(&tdc->dma_chan); - tdc->config_init = false; - - return pm_runtime_get_sync(tdma->dev); -} - -static void tegra_dma_free_chan_resources(struct dma_chan *dc) -{ - struct tegra_dma_channel *tdc = to_tegra_dma_chan(dc); - struct tegra_dma *tdma = tdc->tdma; - - struct tegra_dma_desc *dma_desc; - struct tegra_dma_sg_req *sg_req; - struct list_head dma_desc_list; - struct list_head sg_req_list; - unsigned long flags; - - INIT_LIST_HEAD(&dma_desc_list); - INIT_LIST_HEAD(&sg_req_list); - - dev_dbg(tdc2dev(tdc), "Freeing channel %d\n", tdc->id); - - if (tdc->busy) - tegra_dma_terminate_all(dc); - - spin_lock_irqsave(&tdc->lock, flags); - list_splice_init(&tdc->pending_sg_req, &sg_req_list); - list_splice_init(&tdc->free_sg_req, &sg_req_list); - list_splice_init(&tdc->free_dma_desc, &dma_desc_list); - INIT_LIST_HEAD(&tdc->cb_desc); - tdc->config_init = false; - tdc->isr_handler = NULL; - spin_unlock_irqrestore(&tdc->lock, flags); - - while (!list_empty(&dma_desc_list)) { - dma_desc = list_first_entry(&dma_desc_list, - typeof(*dma_desc), node); - list_del(&dma_desc->node); - kfree(dma_desc); - } - - while (!list_empty(&sg_req_list)) { - sg_req = list_first_entry(&sg_req_list, typeof(*sg_req), node); - list_del(&sg_req->node); - kfree(sg_req); - } - pm_runtime_put(tdma->dev); - - tdc->slave_id = 0; -} - static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec, struct of_dma *ofdma) { @@ -1335,6 +437,7 @@ static struct dma_chan *tegra_dma_of_xlate(struct of_phandle_args *dma_spec, /* Tegra20 specific DMA controller information */ static const struct tegra_dma_chip_data tegra20_dma_chip_data = { + .burst_time = TEGRA_APBDMA_BURST_COMPLETE_TIME, .nr_channels = 16, .channel_reg_size = 0x20, .max_dma_count = 1024UL * 64, @@ -1344,6 +447,7 @@ static const struct tegra_dma_chip_data tegra20_dma_chip_data = { /* Tegra30 specific DMA controller information */ static const struct tegra_dma_chip_data tegra30_dma_chip_data = { + .burst_time = TEGRA_APBDMA_BURST_COMPLETE_TIME, .nr_channels = 32, .channel_reg_size = 0x20, .max_dma_count = 1024UL * 64, @@ -1353,6 +457,7 @@ static const struct tegra_dma_chip_data tegra30_dma_chip_data = { /* Tegra114 specific DMA controller information */ static const struct tegra_dma_chip_data tegra114_dma_chip_data = { + .burst_time = TEGRA_APBDMA_BURST_COMPLETE_TIME, .nr_channels = 32, .channel_reg_size = 0x20, .max_dma_count = 1024UL * 64, @@ -1362,6 +467,7 @@ static const struct tegra_dma_chip_data tegra114_dma_chip_data = { /* Tegra148 specific DMA controller information */ static const struct tegra_dma_chip_data tegra148_dma_chip_data = { + .burst_time = TEGRA_APBDMA_BURST_COMPLETE_TIME, .nr_channels = 32, .channel_reg_size = 0x40, .max_dma_count = 1024UL * 64, -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html