diff options
Diffstat (limited to 'target/linux/xburst/patches-2.6.35/010-dma.patch')
| -rw-r--r-- | target/linux/xburst/patches-2.6.35/010-dma.patch | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/target/linux/xburst/patches-2.6.35/010-dma.patch b/target/linux/xburst/patches-2.6.35/010-dma.patch new file mode 100644 index 0000000..17f5dd2 --- /dev/null +++ b/target/linux/xburst/patches-2.6.35/010-dma.patch @@ -0,0 +1,404 @@ +From ced95a5a9d7a3ba168e8518d9b5004c9a0cad1fe Mon Sep 17 00:00:00 2001 +From: Lars-Peter Clausen <lars@metafoo.de> +Date: Sat, 19 Jun 2010 04:08:14 +0000 +Subject: [PATCH] MIPS: JZ4740: Add DMA support. + +Add support for DMA transfers on JZ4740 SoCs. + +Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> +Cc: linux-mips@linux-mips.org +Cc: linux-kernel@vger.kernel.org +Patchwork: https://patchwork.linux-mips.org/patch/1401/ +Signed-off-by: Ralf Baechle <ralf@linux-mips.org> +--- + arch/mips/include/asm/mach-jz4740/dma.h | 90 ++++++++++ + arch/mips/jz4740/dma.c | 289 +++++++++++++++++++++++++++++++ + 2 files changed, 379 insertions(+), 0 deletions(-) + create mode 100644 arch/mips/include/asm/mach-jz4740/dma.h + create mode 100644 arch/mips/jz4740/dma.c + +--- /dev/null ++++ b/arch/mips/include/asm/mach-jz4740/dma.h +@@ -0,0 +1,90 @@ ++/* ++ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> ++ * JZ7420/JZ4740 DMA definitions ++ * ++ * 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. ++ * ++ */ ++ ++#ifndef __ASM_MACH_JZ4740_DMA_H__ ++#define __ASM_MACH_JZ4740_DMA_H__ ++ ++struct jz4740_dma_chan; ++ ++enum jz4740_dma_request_type { ++ JZ4740_DMA_TYPE_AUTO_REQUEST = 8, ++ JZ4740_DMA_TYPE_UART_TRANSMIT = 20, ++ JZ4740_DMA_TYPE_UART_RECEIVE = 21, ++ JZ4740_DMA_TYPE_SPI_TRANSMIT = 22, ++ JZ4740_DMA_TYPE_SPI_RECEIVE = 23, ++ JZ4740_DMA_TYPE_AIC_TRANSMIT = 24, ++ JZ4740_DMA_TYPE_AIC_RECEIVE = 25, ++ JZ4740_DMA_TYPE_MMC_TRANSMIT = 26, ++ JZ4740_DMA_TYPE_MMC_RECEIVE = 27, ++ JZ4740_DMA_TYPE_TCU = 28, ++ JZ4740_DMA_TYPE_SADC = 29, ++ JZ4740_DMA_TYPE_SLCD = 30, ++}; ++ ++enum jz4740_dma_width { ++ JZ4740_DMA_WIDTH_32BIT = 0, ++ JZ4740_DMA_WIDTH_8BIT = 1, ++ JZ4740_DMA_WIDTH_16BIT = 2, ++}; ++ ++enum jz4740_dma_transfer_size { ++ JZ4740_DMA_TRANSFER_SIZE_4BYTE = 0, ++ JZ4740_DMA_TRANSFER_SIZE_1BYTE = 1, ++ JZ4740_DMA_TRANSFER_SIZE_2BYTE = 2, ++ JZ4740_DMA_TRANSFER_SIZE_16BYTE = 3, ++ JZ4740_DMA_TRANSFER_SIZE_32BYTE = 4, ++}; ++ ++enum jz4740_dma_flags { ++ JZ4740_DMA_SRC_AUTOINC = 0x2, ++ JZ4740_DMA_DST_AUTOINC = 0x1, ++}; ++ ++enum jz4740_dma_mode { ++ JZ4740_DMA_MODE_SINGLE = 0, ++ JZ4740_DMA_MODE_BLOCK = 1, ++}; ++ ++struct jz4740_dma_config { ++ enum jz4740_dma_width src_width; ++ enum jz4740_dma_width dst_width; ++ enum jz4740_dma_transfer_size transfer_size; ++ enum jz4740_dma_request_type request_type; ++ enum jz4740_dma_flags flags; ++ enum jz4740_dma_mode mode; ++}; ++ ++typedef void (*jz4740_dma_complete_callback_t)(struct jz4740_dma_chan *, int, void *); ++ ++struct jz4740_dma_chan *jz4740_dma_request(void *dev, const char *name); ++void jz4740_dma_free(struct jz4740_dma_chan *dma); ++ ++void jz4740_dma_configure(struct jz4740_dma_chan *dma, ++ const struct jz4740_dma_config *config); ++ ++ ++void jz4740_dma_enable(struct jz4740_dma_chan *dma); ++void jz4740_dma_disable(struct jz4740_dma_chan *dma); ++ ++void jz4740_dma_set_src_addr(struct jz4740_dma_chan *dma, dma_addr_t src); ++void jz4740_dma_set_dst_addr(struct jz4740_dma_chan *dma, dma_addr_t dst); ++void jz4740_dma_set_transfer_count(struct jz4740_dma_chan *dma, uint32_t count); ++ ++uint32_t jz4740_dma_get_residue(const struct jz4740_dma_chan *dma); ++ ++void jz4740_dma_set_complete_cb(struct jz4740_dma_chan *dma, ++ jz4740_dma_complete_callback_t cb); ++ ++#endif /* __ASM_JZ4740_DMA_H__ */ +--- /dev/null ++++ b/arch/mips/jz4740/dma.c +@@ -0,0 +1,289 @@ ++/* ++ * Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de> ++ * JZ4740 SoC DMA 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/kernel.h> ++#include <linux/module.h> ++#include <linux/spinlock.h> ++#include <linux/interrupt.h> ++ ++#include <linux/dma-mapping.h> ++#include <asm/mach-jz4740/dma.h> ++#include <asm/mach-jz4740/base.h> ++ ++#define JZ_REG_DMA_SRC_ADDR(x) (0x00 + (x) * 0x20) ++#define JZ_REG_DMA_DST_ADDR(x) (0x04 + (x) * 0x20) ++#define JZ_REG_DMA_TRANSFER_COUNT(x) (0x08 + (x) * 0x20) ++#define JZ_REG_DMA_REQ_TYPE(x) (0x0C + (x) * 0x20) ++#define JZ_REG_DMA_STATUS_CTRL(x) (0x10 + (x) * 0x20) ++#define JZ_REG_DMA_CMD(x) (0x14 + (x) * 0x20) ++#define JZ_REG_DMA_DESC_ADDR(x) (0x18 + (x) * 0x20) ++ ++#define JZ_REG_DMA_CTRL 0x300 ++#define JZ_REG_DMA_IRQ 0x304 ++#define JZ_REG_DMA_DOORBELL 0x308 ++#define JZ_REG_DMA_DOORBELL_SET 0x30C ++ ++#define JZ_DMA_STATUS_CTRL_NO_DESC BIT(31) ++#define JZ_DMA_STATUS_CTRL_DESC_INV BIT(6) ++#define JZ_DMA_STATUS_CTRL_ADDR_ERR BIT(4) ++#define JZ_DMA_STATUS_CTRL_TRANSFER_DONE BIT(3) ++#define JZ_DMA_STATUS_CTRL_HALT BIT(2) ++#define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE BIT(1) ++#define JZ_DMA_STATUS_CTRL_ENABLE BIT(0) ++ ++#define JZ_DMA_CMD_SRC_INC BIT(23) ++#define JZ_DMA_CMD_DST_INC BIT(22) ++#define JZ_DMA_CMD_RDIL_MASK (0xf << 16) ++#define JZ_DMA_CMD_SRC_WIDTH_MASK (0x3 << 14) ++#define JZ_DMA_CMD_DST_WIDTH_MASK (0x3 << 12) ++#define JZ_DMA_CMD_INTERVAL_LENGTH_MASK (0x7 << 8) ++#define JZ_DMA_CMD_BLOCK_MODE BIT(7) ++#define JZ_DMA_CMD_DESC_VALID BIT(4) ++#define JZ_DMA_CMD_DESC_VALID_MODE BIT(3) ++#define JZ_DMA_CMD_VALID_IRQ_ENABLE BIT(2) ++#define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE BIT(1) ++#define JZ_DMA_CMD_LINK_ENABLE BIT(0) ++ ++#define JZ_DMA_CMD_FLAGS_OFFSET 22 ++#define JZ_DMA_CMD_RDIL_OFFSET 16 ++#define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14 ++#define JZ_DMA_CMD_DST_WIDTH_OFFSET 12 ++#define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8 ++#define JZ_DMA_CMD_MODE_OFFSET 7 ++ ++#define JZ_DMA_CTRL_PRIORITY_MASK (0x3 << 8) ++#define JZ_DMA_CTRL_HALT BIT(3) ++#define JZ_DMA_CTRL_ADDRESS_ERROR BIT(2) ++#define JZ_DMA_CTRL_ENABLE BIT(0) ++ ++ ++static void __iomem *jz4740_dma_base; ++static spinlock_t jz4740_dma_lock; ++ ++static inline uint32_t jz4740_dma_read(size_t reg) ++{ ++ return readl(jz4740_dma_base + reg); ++} ++ ++static inline void jz4740_dma_write(size_t reg, uint32_t val) ++{ ++ writel(val, jz4740_dma_base + reg); ++} ++ ++static inline void jz4740_dma_write_mask(size_t reg, uint32_t val, uint32_t mask) ++{ ++ uint32_t val2; ++ val2 = jz4740_dma_read(reg); ++ val2 &= ~mask; ++ val2 |= val; ++ jz4740_dma_write(reg, val2); ++} ++ ++struct jz4740_dma_chan { ++ unsigned int id; ++ void *dev; ++ const char *name; ++ ++ enum jz4740_dma_flags flags; ++ uint32_t transfer_shift; ++ ++ jz4740_dma_complete_callback_t complete_cb; ++ ++ unsigned used:1; ++}; ++ ++#define JZ4740_DMA_CHANNEL(_id) { .id = _id } ++ ++struct jz4740_dma_chan jz4740_dma_channels[] = { ++ JZ4740_DMA_CHANNEL(0), ++ JZ4740_DMA_CHANNEL(1), ++ JZ4740_DMA_CHANNEL(2), ++ JZ4740_DMA_CHANNEL(3), ++ JZ4740_DMA_CHANNEL(4), ++ JZ4740_DMA_CHANNEL(5), ++}; ++ ++struct jz4740_dma_chan *jz4740_dma_request(void *dev, const char *name) ++{ ++ unsigned int i; ++ struct jz4740_dma_chan *dma = NULL; ++ ++ spin_lock(&jz4740_dma_lock); ++ ++ for (i = 0; i < ARRAY_SIZE(jz4740_dma_channels); ++i) { ++ if (!jz4740_dma_channels[i].used) { ++ dma = &jz4740_dma_channels[i]; ++ dma->used = 1; ++ break; ++ } ++ } ++ ++ spin_unlock(&jz4740_dma_lock); ++ ++ if (!dma) ++ return NULL; ++ ++ dma->dev = dev; ++ dma->name = name; ++ ++ return dma; ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_request); ++ ++void jz4740_dma_configure(struct jz4740_dma_chan *dma, ++ const struct jz4740_dma_config *config) ++{ ++ uint32_t cmd; ++ ++ switch (config->transfer_size) { ++ case JZ4740_DMA_TRANSFER_SIZE_2BYTE: ++ dma->transfer_shift = 1; ++ break; ++ case JZ4740_DMA_TRANSFER_SIZE_4BYTE: ++ dma->transfer_shift = 2; ++ break; ++ case JZ4740_DMA_TRANSFER_SIZE_16BYTE: ++ dma->transfer_shift = 4; ++ break; ++ case JZ4740_DMA_TRANSFER_SIZE_32BYTE: ++ dma->transfer_shift = 5; ++ break; ++ default: ++ dma->transfer_shift = 0; ++ break; ++ } ++ ++ cmd = config->flags << JZ_DMA_CMD_FLAGS_OFFSET; ++ cmd |= config->src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET; ++ cmd |= config->dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET; ++ cmd |= config->transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET; ++ cmd |= config->mode << JZ_DMA_CMD_MODE_OFFSET; ++ cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE; ++ ++ jz4740_dma_write(JZ_REG_DMA_CMD(dma->id), cmd); ++ jz4740_dma_write(JZ_REG_DMA_STATUS_CTRL(dma->id), 0); ++ jz4740_dma_write(JZ_REG_DMA_REQ_TYPE(dma->id), config->request_type); ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_configure); ++ ++void jz4740_dma_set_src_addr(struct jz4740_dma_chan *dma, dma_addr_t src) ++{ ++ jz4740_dma_write(JZ_REG_DMA_SRC_ADDR(dma->id), src); ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_set_src_addr); ++ ++void jz4740_dma_set_dst_addr(struct jz4740_dma_chan *dma, dma_addr_t dst) ++{ ++ jz4740_dma_write(JZ_REG_DMA_DST_ADDR(dma->id), dst); ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_set_dst_addr); ++ ++void jz4740_dma_set_transfer_count(struct jz4740_dma_chan *dma, uint32_t count) ++{ ++ count >>= dma->transfer_shift; ++ jz4740_dma_write(JZ_REG_DMA_TRANSFER_COUNT(dma->id), count); ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_set_transfer_count); ++ ++void jz4740_dma_set_complete_cb(struct jz4740_dma_chan *dma, ++ jz4740_dma_complete_callback_t cb) ++{ ++ dma->complete_cb = cb; ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_set_complete_cb); ++ ++void jz4740_dma_free(struct jz4740_dma_chan *dma) ++{ ++ dma->dev = NULL; ++ dma->complete_cb = NULL; ++ dma->used = 0; ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_free); ++ ++void jz4740_dma_enable(struct jz4740_dma_chan *dma) ++{ ++ jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), ++ JZ_DMA_STATUS_CTRL_NO_DESC | JZ_DMA_STATUS_CTRL_ENABLE, ++ JZ_DMA_STATUS_CTRL_HALT | JZ_DMA_STATUS_CTRL_NO_DESC | ++ JZ_DMA_STATUS_CTRL_ENABLE); ++ ++ jz4740_dma_write_mask(JZ_REG_DMA_CTRL, ++ JZ_DMA_CTRL_ENABLE, ++ JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE); ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_enable); ++ ++void jz4740_dma_disable(struct jz4740_dma_chan *dma) ++{ ++ jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0, ++ JZ_DMA_STATUS_CTRL_ENABLE); ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_disable); ++ ++uint32_t jz4740_dma_get_residue(const struct jz4740_dma_chan *dma) ++{ ++ uint32_t residue; ++ residue = jz4740_dma_read(JZ_REG_DMA_TRANSFER_COUNT(dma->id)); ++ return residue << dma->transfer_shift; ++} ++EXPORT_SYMBOL_GPL(jz4740_dma_get_residue); ++ ++static void jz4740_dma_chan_irq(struct jz4740_dma_chan *dma) ++{ ++ uint32_t status; ++ ++ status = jz4740_dma_read(JZ_REG_DMA_STATUS_CTRL(dma->id)); ++ ++ jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0, ++ JZ_DMA_STATUS_CTRL_ENABLE | JZ_DMA_STATUS_CTRL_TRANSFER_DONE); ++ ++ if (dma->complete_cb) ++ dma->complete_cb(dma, 0, dma->dev); ++} ++ ++static irqreturn_t jz4740_dma_irq(int irq, void *dev_id) ++{ ++ uint32_t irq_status; ++ unsigned int i; ++ ++ irq_status = readl(jz4740_dma_base + JZ_REG_DMA_IRQ); ++ ++ for (i = 0; i < 6; ++i) { ++ if (irq_status & (1 << i)) ++ jz4740_dma_chan_irq(&jz4740_dma_channels[i]); ++ } ++ ++ return IRQ_HANDLED; ++} ++ ++static int jz4740_dma_init(void) ++{ ++ unsigned int ret; ++ ++ jz4740_dma_base = ioremap(JZ4740_DMAC_BASE_ADDR, 0x400); ++ ++ if (!jz4740_dma_base) ++ return -EBUSY; ++ ++ spin_lock_init(&jz4740_dma_lock); ++ ++ ret = request_irq(JZ4740_IRQ_DMAC, jz4740_dma_irq, 0, "DMA", NULL); ++ ++ if (ret) ++ printk(KERN_ERR "JZ4740 DMA: Failed to request irq: %d\n", ret); ++ ++ return ret; ++} ++arch_initcall(jz4740_dma_init); |