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-rw-r--r--target/linux/xburst/patches-3.10/011-dma-Add-a-jz4740-dmaengine-driver.patch478
1 files changed, 0 insertions, 478 deletions
diff --git a/target/linux/xburst/patches-3.10/011-dma-Add-a-jz4740-dmaengine-driver.patch b/target/linux/xburst/patches-3.10/011-dma-Add-a-jz4740-dmaengine-driver.patch
deleted file mode 100644
index e53896bba9..0000000000
--- a/target/linux/xburst/patches-3.10/011-dma-Add-a-jz4740-dmaengine-driver.patch
+++ /dev/null
@@ -1,478 +0,0 @@
-From 8c53b6491806a37d6999886d22c34bfed310034c Mon Sep 17 00:00:00 2001
-From: Lars-Peter Clausen <lars@metafoo.de>
-Date: Thu, 30 May 2013 18:25:02 +0200
-Subject: [PATCH 11/16] dma: Add a jz4740 dmaengine driver
-
-This patch adds dmaengine support for the JZ4740 DMA controller. For now the
-driver will be a wrapper around the custom JZ4740 DMA API. Once all users of the
-custom JZ4740 DMA API have been converted to the dmaengine API the custom API
-will be removed and direct hardware access will be added to the dmaengine
-driver.
-
-Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
-Signed-off-by: Vinod Koul <vinod.koul@intel.com>
----
- drivers/dma/Kconfig | 6 +
- drivers/dma/Makefile | 1 +
- drivers/dma/dma-jz4740.c | 433 ++++++++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 440 insertions(+)
- create mode 100644 drivers/dma/dma-jz4740.c
-
---- a/drivers/dma/Kconfig
-+++ b/drivers/dma/Kconfig
-@@ -312,6 +312,12 @@ config MMP_PDMA
- help
- Support the MMP PDMA engine for PXA and MMP platfrom.
-
-+config DMA_JZ4740
-+ tristate "JZ4740 DMA support"
-+ depends on MACH_JZ4740
-+ select DMA_ENGINE
-+ select DMA_VIRTUAL_CHANNELS
-+
- config DMA_ENGINE
- bool
-
---- a/drivers/dma/Makefile
-+++ b/drivers/dma/Makefile
-@@ -38,3 +38,4 @@ obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o
- obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o
- obj-$(CONFIG_DMA_OMAP) += omap-dma.o
- obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o
-+obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o
---- /dev/null
-+++ b/drivers/dma/dma-jz4740.c
-@@ -0,0 +1,433 @@
-+/*
-+ * Copyright (C) 2013, Lars-Peter Clausen <lars@metafoo.de>
-+ * JZ4740 DMAC support
-+ *
-+ * This program is free software; you can redistribute it and/or modify it
-+ * under the terms of the GNU General Public License as published by the
-+ * Free Software Foundation; either version 2 of the License, or (at your
-+ * option) any later version.
-+ *
-+ * You should have received a copy of the GNU General Public License along
-+ * with this program; if not, write to the Free Software Foundation, Inc.,
-+ * 675 Mass Ave, Cambridge, MA 02139, USA.
-+ *
-+ */
-+
-+#include <linux/dmaengine.h>
-+#include <linux/dma-mapping.h>
-+#include <linux/err.h>
-+#include <linux/init.h>
-+#include <linux/list.h>
-+#include <linux/module.h>
-+#include <linux/platform_device.h>
-+#include <linux/slab.h>
-+#include <linux/spinlock.h>
-+
-+#include <asm/mach-jz4740/dma.h>
-+
-+#include "virt-dma.h"
-+
-+#define JZ_DMA_NR_CHANS 6
-+
-+struct jz4740_dma_sg {
-+ dma_addr_t addr;
-+ unsigned int len;
-+};
-+
-+struct jz4740_dma_desc {
-+ struct virt_dma_desc vdesc;
-+
-+ enum dma_transfer_direction direction;
-+ bool cyclic;
-+
-+ unsigned int num_sgs;
-+ struct jz4740_dma_sg sg[];
-+};
-+
-+struct jz4740_dmaengine_chan {
-+ struct virt_dma_chan vchan;
-+ struct jz4740_dma_chan *jz_chan;
-+
-+ dma_addr_t fifo_addr;
-+
-+ struct jz4740_dma_desc *desc;
-+ unsigned int next_sg;
-+};
-+
-+struct jz4740_dma_dev {
-+ struct dma_device ddev;
-+
-+ struct jz4740_dmaengine_chan chan[JZ_DMA_NR_CHANS];
-+};
-+
-+static struct jz4740_dmaengine_chan *to_jz4740_dma_chan(struct dma_chan *c)
-+{
-+ return container_of(c, struct jz4740_dmaengine_chan, vchan.chan);
-+}
-+
-+static struct jz4740_dma_desc *to_jz4740_dma_desc(struct virt_dma_desc *vdesc)
-+{
-+ return container_of(vdesc, struct jz4740_dma_desc, vdesc);
-+}
-+
-+static struct jz4740_dma_desc *jz4740_dma_alloc_desc(unsigned int num_sgs)
-+{
-+ return kzalloc(sizeof(struct jz4740_dma_desc) +
-+ sizeof(struct jz4740_dma_sg) * num_sgs, GFP_ATOMIC);
-+}
-+
-+static enum jz4740_dma_width jz4740_dma_width(enum dma_slave_buswidth width)
-+{
-+ switch (width) {
-+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
-+ return JZ4740_DMA_WIDTH_8BIT;
-+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
-+ return JZ4740_DMA_WIDTH_16BIT;
-+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
-+ return JZ4740_DMA_WIDTH_32BIT;
-+ default:
-+ return JZ4740_DMA_WIDTH_32BIT;
-+ }
-+}
-+
-+static enum jz4740_dma_transfer_size jz4740_dma_maxburst(u32 maxburst)
-+{
-+ if (maxburst <= 1)
-+ return JZ4740_DMA_TRANSFER_SIZE_1BYTE;
-+ else if (maxburst <= 3)
-+ return JZ4740_DMA_TRANSFER_SIZE_2BYTE;
-+ else if (maxburst <= 15)
-+ return JZ4740_DMA_TRANSFER_SIZE_4BYTE;
-+ else if (maxburst <= 31)
-+ return JZ4740_DMA_TRANSFER_SIZE_16BYTE;
-+
-+ return JZ4740_DMA_TRANSFER_SIZE_32BYTE;
-+}
-+
-+static int jz4740_dma_slave_config(struct dma_chan *c,
-+ const struct dma_slave_config *config)
-+{
-+ struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-+ struct jz4740_dma_config jzcfg;
-+
-+ switch (config->direction) {
-+ case DMA_MEM_TO_DEV:
-+ jzcfg.flags = JZ4740_DMA_SRC_AUTOINC;
-+ jzcfg.transfer_size = jz4740_dma_maxburst(config->dst_maxburst);
-+ chan->fifo_addr = config->dst_addr;
-+ break;
-+ case DMA_DEV_TO_MEM:
-+ jzcfg.flags = JZ4740_DMA_DST_AUTOINC;
-+ jzcfg.transfer_size = jz4740_dma_maxburst(config->src_maxburst);
-+ chan->fifo_addr = config->src_addr;
-+ break;
-+ default:
-+ return -EINVAL;
-+ }
-+
-+
-+ jzcfg.src_width = jz4740_dma_width(config->src_addr_width);
-+ jzcfg.dst_width = jz4740_dma_width(config->dst_addr_width);
-+ jzcfg.mode = JZ4740_DMA_MODE_SINGLE;
-+ jzcfg.request_type = config->slave_id;
-+
-+ jz4740_dma_configure(chan->jz_chan, &jzcfg);
-+
-+ return 0;
-+}
-+
-+static int jz4740_dma_terminate_all(struct dma_chan *c)
-+{
-+ struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-+ unsigned long flags;
-+ LIST_HEAD(head);
-+
-+ spin_lock_irqsave(&chan->vchan.lock, flags);
-+ jz4740_dma_disable(chan->jz_chan);
-+ chan->desc = NULL;
-+ vchan_get_all_descriptors(&chan->vchan, &head);
-+ spin_unlock_irqrestore(&chan->vchan.lock, flags);
-+
-+ vchan_dma_desc_free_list(&chan->vchan, &head);
-+
-+ return 0;
-+}
-+
-+static int jz4740_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
-+ unsigned long arg)
-+{
-+ struct dma_slave_config *config = (struct dma_slave_config *)arg;
-+
-+ switch (cmd) {
-+ case DMA_SLAVE_CONFIG:
-+ return jz4740_dma_slave_config(chan, config);
-+ case DMA_TERMINATE_ALL:
-+ return jz4740_dma_terminate_all(chan);
-+ default:
-+ return -ENOSYS;
-+ }
-+}
-+
-+static int jz4740_dma_start_transfer(struct jz4740_dmaengine_chan *chan)
-+{
-+ dma_addr_t src_addr, dst_addr;
-+ struct virt_dma_desc *vdesc;
-+ struct jz4740_dma_sg *sg;
-+
-+ jz4740_dma_disable(chan->jz_chan);
-+
-+ if (!chan->desc) {
-+ vdesc = vchan_next_desc(&chan->vchan);
-+ if (!vdesc)
-+ return 0;
-+ chan->desc = to_jz4740_dma_desc(vdesc);
-+ chan->next_sg = 0;
-+ }
-+
-+ if (chan->next_sg == chan->desc->num_sgs)
-+ chan->next_sg = 0;
-+
-+ sg = &chan->desc->sg[chan->next_sg];
-+
-+ if (chan->desc->direction == DMA_MEM_TO_DEV) {
-+ src_addr = sg->addr;
-+ dst_addr = chan->fifo_addr;
-+ } else {
-+ src_addr = chan->fifo_addr;
-+ dst_addr = sg->addr;
-+ }
-+ jz4740_dma_set_src_addr(chan->jz_chan, src_addr);
-+ jz4740_dma_set_dst_addr(chan->jz_chan, dst_addr);
-+ jz4740_dma_set_transfer_count(chan->jz_chan, sg->len);
-+
-+ chan->next_sg++;
-+
-+ jz4740_dma_enable(chan->jz_chan);
-+
-+ return 0;
-+}
-+
-+static void jz4740_dma_complete_cb(struct jz4740_dma_chan *jz_chan, int error,
-+ void *devid)
-+{
-+ struct jz4740_dmaengine_chan *chan = devid;
-+
-+ spin_lock(&chan->vchan.lock);
-+ if (chan->desc) {
-+ if (chan->desc && chan->desc->cyclic) {
-+ vchan_cyclic_callback(&chan->desc->vdesc);
-+ } else {
-+ if (chan->next_sg == chan->desc->num_sgs) {
-+ chan->desc = NULL;
-+ vchan_cookie_complete(&chan->desc->vdesc);
-+ }
-+ }
-+ }
-+ jz4740_dma_start_transfer(chan);
-+ spin_unlock(&chan->vchan.lock);
-+}
-+
-+static void jz4740_dma_issue_pending(struct dma_chan *c)
-+{
-+ struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-+ unsigned long flags;
-+
-+ spin_lock_irqsave(&chan->vchan.lock, flags);
-+ if (vchan_issue_pending(&chan->vchan) && !chan->desc)
-+ jz4740_dma_start_transfer(chan);
-+ spin_unlock_irqrestore(&chan->vchan.lock, flags);
-+}
-+
-+static struct dma_async_tx_descriptor *jz4740_dma_prep_slave_sg(
-+ struct dma_chan *c, struct scatterlist *sgl,
-+ unsigned int sg_len, enum dma_transfer_direction direction,
-+ unsigned long flags, void *context)
-+{
-+ struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-+ struct jz4740_dma_desc *desc;
-+ struct scatterlist *sg;
-+ unsigned int i;
-+
-+ desc = jz4740_dma_alloc_desc(sg_len);
-+ if (!desc)
-+ return NULL;
-+
-+ for_each_sg(sgl, sg, sg_len, i) {
-+ desc->sg[i].addr = sg_dma_address(sg);
-+ desc->sg[i].len = sg_dma_len(sg);
-+ }
-+
-+ desc->num_sgs = sg_len;
-+ desc->direction = direction;
-+ desc->cyclic = false;
-+
-+ return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-+}
-+
-+static struct dma_async_tx_descriptor *jz4740_dma_prep_dma_cyclic(
-+ struct dma_chan *c, dma_addr_t buf_addr, size_t buf_len,
-+ size_t period_len, enum dma_transfer_direction direction,
-+ unsigned long flags, void *context)
-+{
-+ struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-+ struct jz4740_dma_desc *desc;
-+ unsigned int num_periods, i;
-+
-+ if (buf_len % period_len)
-+ return NULL;
-+
-+ num_periods = buf_len / period_len;
-+
-+ desc = jz4740_dma_alloc_desc(num_periods);
-+ if (!desc)
-+ return NULL;
-+
-+ for (i = 0; i < num_periods; i++) {
-+ desc->sg[i].addr = buf_addr;
-+ desc->sg[i].len = period_len;
-+ buf_addr += period_len;
-+ }
-+
-+ desc->num_sgs = num_periods;
-+ desc->direction = direction;
-+ desc->cyclic = true;
-+
-+ return vchan_tx_prep(&chan->vchan, &desc->vdesc, flags);
-+}
-+
-+static size_t jz4740_dma_desc_residue(struct jz4740_dmaengine_chan *chan,
-+ struct jz4740_dma_desc *desc, unsigned int next_sg)
-+{
-+ size_t residue = 0;
-+ unsigned int i;
-+
-+ residue = 0;
-+
-+ for (i = next_sg; i < desc->num_sgs; i++)
-+ residue += desc->sg[i].len;
-+
-+ if (next_sg != 0)
-+ residue += jz4740_dma_get_residue(chan->jz_chan);
-+
-+ return residue;
-+}
-+
-+static enum dma_status jz4740_dma_tx_status(struct dma_chan *c,
-+ dma_cookie_t cookie, struct dma_tx_state *state)
-+{
-+ struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-+ struct virt_dma_desc *vdesc;
-+ enum dma_status status;
-+ unsigned long flags;
-+
-+ status = dma_cookie_status(c, cookie, state);
-+ if (status == DMA_SUCCESS || !state)
-+ return status;
-+
-+ spin_lock_irqsave(&chan->vchan.lock, flags);
-+ vdesc = vchan_find_desc(&chan->vchan, cookie);
-+ if (cookie == chan->desc->vdesc.tx.cookie) {
-+ state->residue = jz4740_dma_desc_residue(chan, chan->desc,
-+ chan->next_sg);
-+ } else if (vdesc) {
-+ state->residue = jz4740_dma_desc_residue(chan,
-+ to_jz4740_dma_desc(vdesc), 0);
-+ } else {
-+ state->residue = 0;
-+ }
-+ spin_unlock_irqrestore(&chan->vchan.lock, flags);
-+
-+ return status;
-+}
-+
-+static int jz4740_dma_alloc_chan_resources(struct dma_chan *c)
-+{
-+ struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-+
-+ chan->jz_chan = jz4740_dma_request(chan, NULL);
-+ if (!chan->jz_chan)
-+ return -EBUSY;
-+
-+ jz4740_dma_set_complete_cb(chan->jz_chan, jz4740_dma_complete_cb);
-+
-+ return 0;
-+}
-+
-+static void jz4740_dma_free_chan_resources(struct dma_chan *c)
-+{
-+ struct jz4740_dmaengine_chan *chan = to_jz4740_dma_chan(c);
-+
-+ vchan_free_chan_resources(&chan->vchan);
-+ jz4740_dma_free(chan->jz_chan);
-+ chan->jz_chan = NULL;
-+}
-+
-+static void jz4740_dma_desc_free(struct virt_dma_desc *vdesc)
-+{
-+ kfree(container_of(vdesc, struct jz4740_dma_desc, vdesc));
-+}
-+
-+static int jz4740_dma_probe(struct platform_device *pdev)
-+{
-+ struct jz4740_dmaengine_chan *chan;
-+ struct jz4740_dma_dev *dmadev;
-+ struct dma_device *dd;
-+ unsigned int i;
-+ int ret;
-+
-+ dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
-+ if (!dmadev)
-+ return -EINVAL;
-+
-+ dd = &dmadev->ddev;
-+
-+ dma_cap_set(DMA_SLAVE, dd->cap_mask);
-+ dma_cap_set(DMA_CYCLIC, dd->cap_mask);
-+ dd->device_alloc_chan_resources = jz4740_dma_alloc_chan_resources;
-+ dd->device_free_chan_resources = jz4740_dma_free_chan_resources;
-+ dd->device_tx_status = jz4740_dma_tx_status;
-+ dd->device_issue_pending = jz4740_dma_issue_pending;
-+ dd->device_prep_slave_sg = jz4740_dma_prep_slave_sg;
-+ dd->device_prep_dma_cyclic = jz4740_dma_prep_dma_cyclic;
-+ dd->device_control = jz4740_dma_control;
-+ dd->dev = &pdev->dev;
-+ dd->chancnt = JZ_DMA_NR_CHANS;
-+ INIT_LIST_HEAD(&dd->channels);
-+
-+ for (i = 0; i < dd->chancnt; i++) {
-+ chan = &dmadev->chan[i];
-+ chan->vchan.desc_free = jz4740_dma_desc_free;
-+ vchan_init(&chan->vchan, dd);
-+ }
-+
-+ ret = dma_async_device_register(dd);
-+ if (ret)
-+ return ret;
-+
-+ platform_set_drvdata(pdev, dmadev);
-+
-+ return 0;
-+}
-+
-+static int jz4740_dma_remove(struct platform_device *pdev)
-+{
-+ struct jz4740_dma_dev *dmadev = platform_get_drvdata(pdev);
-+
-+ dma_async_device_unregister(&dmadev->ddev);
-+
-+ return 0;
-+}
-+
-+static struct platform_driver jz4740_dma_driver = {
-+ .probe = jz4740_dma_probe,
-+ .remove = jz4740_dma_remove,
-+ .driver = {
-+ .name = "jz4740-dma",
-+ .owner = THIS_MODULE,
-+ },
-+};
-+module_platform_driver(jz4740_dma_driver);
-+
-+MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
-+MODULE_DESCRIPTION("JZ4740 DMA driver");
-+MODULE_LICENSE("GPLv2");
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-10 03:31:11 +0000