diff options
Diffstat (limited to 'target/linux/ramips/patches-3.8/0061-DMA-MIPS-ralink-add-dmaengine-driver.patch')
| -rw-r--r-- | target/linux/ramips/patches-3.8/0061-DMA-MIPS-ralink-add-dmaengine-driver.patch | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/target/linux/ramips/patches-3.8/0061-DMA-MIPS-ralink-add-dmaengine-driver.patch b/target/linux/ramips/patches-3.8/0061-DMA-MIPS-ralink-add-dmaengine-driver.patch new file mode 100644 index 0000000..a2f8f09 --- /dev/null +++ b/target/linux/ramips/patches-3.8/0061-DMA-MIPS-ralink-add-dmaengine-driver.patch @@ -0,0 +1,341 @@ +From 1db0d19afe5830f7d020c7c5386be8cc20cf0f15 Mon Sep 17 00:00:00 2001 +From: John Crispin <blogic@openwrt.org> +Date: Thu, 23 May 2013 18:45:29 +0200 +Subject: [PATCH 61/79] DMA: MIPS: ralink: add dmaengine driver + +Signed-off-by: John Crispin <blogic@openwrt.org> +--- + drivers/dma/Kconfig | 7 ++ + drivers/dma/Makefile | 1 + + drivers/dma/ralink_gdma.c | 229 +++++++++++++++++++++++++++++++++++++++++++++ + drivers/dma/ralink_gdma.h | 55 +++++++++++ + 4 files changed, 292 insertions(+) + create mode 100644 drivers/dma/ralink_gdma.c + create mode 100644 drivers/dma/ralink_gdma.h + +diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig +index d4c1218..323f684 100644 +--- a/drivers/dma/Kconfig ++++ b/drivers/dma/Kconfig +@@ -320,6 +320,13 @@ config MMP_PDMA + help + Support the MMP PDMA engine for PXA and MMP platfrom. + ++config RALINK_GDMA ++ bool "Ralink Generic DMA support" ++ depends on RALINK ++ select DMA_ENGINE ++ help ++ Support the GDMA engine for MIPS based Ralink SoC. ++ + config DMA_ENGINE + bool + +diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile +index 7428fea..a981e2c 100644 +--- a/drivers/dma/Makefile ++++ b/drivers/dma/Makefile +@@ -34,3 +34,4 @@ 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_RALINK_GDMA) += ralink_gdma.o +diff --git a/drivers/dma/ralink_gdma.c b/drivers/dma/ralink_gdma.c +new file mode 100644 +index 0000000..be7c317 +--- /dev/null ++++ b/drivers/dma/ralink_gdma.c +@@ -0,0 +1,229 @@ ++#include <linux/init.h> ++#include <linux/module.h> ++#include <linux/slab.h> ++#include <linux/delay.h> ++#include <linux/dma-mapping.h> ++#include <linux/spinlock.h> ++#include <linux/interrupt.h> ++#include <linux/platform_device.h> ++#include <linux/of_platform.h> ++#include <linux/memory.h> ++ ++#include "ralink_gdma.h" ++ ++#define SURFBOARDINT_DMA 10 ++#define MEMCPY_DMA_CH 8 ++#define to_rt2880_dma_chan(chan) \ ++ container_of(chan, struct rt2880_dma_chan, common) ++ ++static dma_cookie_t rt2880_dma_tx_submit(struct dma_async_tx_descriptor *tx) ++{ ++ dma_cookie_t cookie; ++ ++ cookie = tx->chan->cookie; ++ ++ return cookie; ++} ++ ++#define MIN_RTDMA_PKT_LEN 128 ++static struct dma_async_tx_descriptor * ++rt2880_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest, dma_addr_t src, ++ size_t len, unsigned long flags) ++{ ++ struct rt2880_dma_chan *rt_chan = to_rt2880_dma_chan(chan); ++ unsigned long mid_offset; ++ ++ spin_lock_bh(&rt_chan->lock); ++ ++ if(len < MIN_RTDMA_PKT_LEN) { ++ memcpy(phys_to_virt(dest), phys_to_virt(src), len); ++ } else { ++ mid_offset = len/2; ++ ++ /* Lower parts are transferred by GDMA. ++ * Upper parts are transferred by CPU. ++ */ ++ RT_DMA_WRITE_REG(RT_DMA_SRC_REG(MEMCPY_DMA_CH), src); ++ RT_DMA_WRITE_REG(RT_DMA_DST_REG(MEMCPY_DMA_CH), dest); ++ RT_DMA_WRITE_REG(RT_DMA_CTRL_REG(MEMCPY_DMA_CH), (mid_offset << 16) | (3 << 3) | (3 << 0)); ++ ++ memcpy(phys_to_virt(dest)+mid_offset, phys_to_virt(src)+mid_offset, len-mid_offset); ++ ++ dma_async_tx_descriptor_init(&rt_chan->txd, chan); ++ ++ while((RT_DMA_READ_REG(RT_DMA_DONEINT) & (0x1<<MEMCPY_DMA_CH))==0); ++ RT_DMA_WRITE_REG(RT_DMA_DONEINT, (1<<MEMCPY_DMA_CH)); ++ } ++ ++ spin_unlock_bh(&rt_chan->lock); ++ ++ return &rt_chan->txd; ++} ++ ++/** ++ * rt2880_dma_status - poll the status of an XOR transaction ++ * @chan: XOR channel handle ++ * @cookie: XOR transaction identifier ++ * @txstate: XOR transactions state holder (or NULL) ++ */ ++static enum dma_status rt2880_dma_status(struct dma_chan *chan, ++ dma_cookie_t cookie, ++ struct dma_tx_state *txstate) ++{ ++ return 0; ++} ++ ++static irqreturn_t rt2880_dma_interrupt_handler(int irq, void *data) ++{ ++ ++ printk("%s\n",__FUNCTION__); ++ ++ return IRQ_HANDLED; ++} ++ ++static void rt2880_dma_issue_pending(struct dma_chan *chan) ++{ ++} ++ ++static int rt2880_dma_alloc_chan_resources(struct dma_chan *chan) ++{ ++// printk("%s\n",__FUNCTION__); ++ ++ return 0; ++} ++ ++static void rt2880_dma_free_chan_resources(struct dma_chan *chan) ++{ ++// printk("%s\n",__FUNCTION__); ++ ++} ++ ++static int rt2880_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd, unsigned long arg) ++{ ++ switch (cmd) { ++ case DMA_TERMINATE_ALL: ++ printk("%s:%s[%d]\n", __FILE__, __func__, __LINE__); ++ break; ++ case DMA_SLAVE_CONFIG: ++ printk("%s:%s[%d]\n", __FILE__, __func__, __LINE__); ++ break; ++ default: ++ return -ENXIO; ++ } ++ ++ return 0; ++} ++ ++static int rt2880_dma_probe(struct platform_device *pdev) ++{ ++ struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ __iomem void *membase; ++ struct dma_device *dma_dev; ++ struct rt2880_dma_chan *rt_chan; ++ int err; ++ int ret; ++ int reg; ++ int irq; ++ ++ membase = devm_request_and_ioremap(&pdev->dev, res); ++ if (IS_ERR(membase)) ++ return PTR_ERR(membase); ++ ++ dma_dev = devm_kzalloc(&pdev->dev, sizeof(*dma_dev), GFP_KERNEL); ++ if (!dma_dev) ++ return -ENOMEM; ++ ++ irq = platform_get_irq(pdev, 0); ++ if (!irq) { ++ dev_err(&pdev->dev, "failed to load irq\n"); ++ return -ENOENT; ++ } ++ ++ ++ INIT_LIST_HEAD(&dma_dev->channels); ++ dma_cap_zero(dma_dev->cap_mask); ++ dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask); ++ dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); ++ dma_dev->device_alloc_chan_resources = rt2880_dma_alloc_chan_resources; ++ dma_dev->device_free_chan_resources = rt2880_dma_free_chan_resources; ++ dma_dev->device_tx_status = rt2880_dma_status; ++ dma_dev->device_issue_pending = rt2880_dma_issue_pending; ++ dma_dev->device_prep_dma_memcpy = rt2880_dma_prep_dma_memcpy; ++ dma_dev->device_control = rt2880_dma_control; ++ dma_dev->dev = &pdev->dev; ++ ++ rt_chan = devm_kzalloc(&pdev->dev, sizeof(*rt_chan), GFP_KERNEL); ++ if (!rt_chan) { ++ return -ENOMEM; ++ } ++ ++ spin_lock_init(&rt_chan->lock); ++ INIT_LIST_HEAD(&rt_chan->chain); ++ INIT_LIST_HEAD(&rt_chan->completed_slots); ++ INIT_LIST_HEAD(&rt_chan->all_slots); ++ rt_chan->common.device = dma_dev; ++ rt_chan->txd.tx_submit = rt2880_dma_tx_submit; ++ ++ list_add_tail(&rt_chan->common.device_node, &dma_dev->channels); ++ ++ err = dma_async_device_register(dma_dev); ++ if (0 != err) { ++ pr_err("ERR_MDMA:device_register failed: %d\n", err); ++ return 1; ++ } ++ ++ ret = request_irq(irq, rt2880_dma_interrupt_handler, 0, dev_name(&pdev->dev), NULL); ++ if(ret){ ++ pr_err("IRQ %d is not free.\n", SURFBOARDINT_DMA); ++ return 1; ++ } ++ ++ //set GDMA register in advance. ++ reg = (32 << 16) | (32 << 8) | (MEMCPY_DMA_CH << 3); ++ RT_DMA_WRITE_REG(RT_DMA_CTRL_REG1(MEMCPY_DMA_CH), reg); ++ ++ dev_info(&pdev->dev, "running\n"); ++ ++ return 0; ++} ++ ++static int rt2880_dma_remove(struct platform_device *dev) ++{ ++ struct dma_device *dma_dev = platform_get_drvdata(dev); ++ ++ printk("%s\n",__FUNCTION__); ++ ++ dma_async_device_unregister(dma_dev); ++ ++ return 0; ++} ++ ++static const struct of_device_id rt2880_dma_match[] = { ++ { .compatible = "ralink,rt2880-gdma" }, ++ {}, ++}; ++MODULE_DEVICE_TABLE(of, rt2880_wdt_match); ++ ++static struct platform_driver rt2880_dma_driver = { ++ .probe = rt2880_dma_probe, ++ .remove = rt2880_dma_remove, ++ .driver = { ++ .owner = THIS_MODULE, ++ .name = RT_DMA_NAME, ++ .of_match_table = rt2880_dma_match, ++ }, ++}; ++ ++static int __init rt2880_dma_init(void) ++{ ++ int rc; ++ ++ rc = platform_driver_register(&rt2880_dma_driver); ++ return rc; ++} ++module_init(rt2880_dma_init); ++ ++MODULE_AUTHOR("Steven Liu <steven_liu@mediatek.com>"); ++MODULE_AUTHOR("John Crispin <blogic@openwrt.org>"); ++MODULE_DESCRIPTION("DMA engine driver for Ralink DMA engine"); ++MODULE_LICENSE("GPL"); +diff --git a/drivers/dma/ralink_gdma.h b/drivers/dma/ralink_gdma.h +new file mode 100644 +index 0000000..73e1948 +--- /dev/null ++++ b/drivers/dma/ralink_gdma.h +@@ -0,0 +1,55 @@ ++/* ++ * Copyright (C) 2007, 2008, Marvell International Ltd. ++ * ++ * 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, write to the Free Software Foundation, ++ * Inc., 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. ++ */ ++ ++#ifndef RT_DMA_H ++#define RT_DMA_H ++ ++#include <linux/types.h> ++#include <linux/io.h> ++#include <linux/dmaengine.h> ++#include <linux/interrupt.h> ++ ++#define RT_DMA_NAME "rt2880_dma" ++ ++#define RALINK_GDMA_BASE 0xB0002800 ++ ++struct rt2880_dma_chan { ++ int pending; ++ dma_cookie_t completed_cookie; ++ spinlock_t lock; /* protects the descriptor slot pool */ ++ void __iomem *mmr_base; ++ unsigned int idx; ++ enum dma_transaction_type current_type; ++ struct dma_async_tx_descriptor txd; ++ struct list_head chain; ++ struct list_head completed_slots; ++ struct dma_chan common; ++ struct list_head all_slots; ++ int slots_allocated; ++ struct tasklet_struct irq_tasklet; ++}; ++ ++#define RT_DMA_READ_REG(addr) le32_to_cpu(*(volatile u32 *)(addr)) ++#define RT_DMA_WRITE_REG(addr, val) *((volatile uint32_t *)(addr)) = cpu_to_le32(val) ++ ++#define RT_DMA_SRC_REG(ch) (RALINK_GDMA_BASE + ch*16) ++#define RT_DMA_DST_REG(ch) (RT_DMA_SRC_REG(ch) + 4) ++#define RT_DMA_CTRL_REG(ch) (RT_DMA_DST_REG(ch) + 4) ++#define RT_DMA_CTRL_REG1(ch) (RT_DMA_CTRL_REG(ch) + 4) ++#define RT_DMA_DONEINT (RALINK_GDMA_BASE + 0x204) ++ ++#endif +-- +1.7.10.4 + |