288 lines
7.4 KiB
C
288 lines
7.4 KiB
C
/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 SoC DMA support
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.h>
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#include <linux/dma-mapping.h>
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#include <asm/mach-jz4740/dma.h>
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#include <asm/mach-jz4740/base.h>
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#define JZ_REG_DMA_SRC_ADDR(x) (0x00 + (x) * 0x20)
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#define JZ_REG_DMA_DST_ADDR(x) (0x04 + (x) * 0x20)
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#define JZ_REG_DMA_TRANSFER_COUNT(x) (0x08 + (x) * 0x20)
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#define JZ_REG_DMA_REQ_TYPE(x) (0x0C + (x) * 0x20)
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#define JZ_REG_DMA_STATUS_CTRL(x) (0x10 + (x) * 0x20)
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#define JZ_REG_DMA_CMD(x) (0x14 + (x) * 0x20)
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#define JZ_REG_DMA_DESC_ADDR(x) (0x18 + (x) * 0x20)
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#define JZ_REG_DMA_CTRL 0x300
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#define JZ_REG_DMA_IRQ 0x304
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#define JZ_REG_DMA_DOORBELL 0x308
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#define JZ_REG_DMA_DOORBELL_SET 0x30C
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#define JZ_DMA_STATUS_CTRL_NO_DESC BIT(31)
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#define JZ_DMA_STATUS_CTRL_DESC_INV BIT(6)
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#define JZ_DMA_STATUS_CTRL_ADDR_ERR BIT(4)
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#define JZ_DMA_STATUS_CTRL_TRANSFER_DONE BIT(3)
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#define JZ_DMA_STATUS_CTRL_HALT BIT(2)
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#define JZ_DMA_STATUS_CTRL_COUNT_TERMINATE BIT(1)
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#define JZ_DMA_STATUS_CTRL_ENABLE BIT(0)
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#define JZ_DMA_CMD_SRC_INC BIT(23)
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#define JZ_DMA_CMD_DST_INC BIT(22)
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#define JZ_DMA_CMD_RDIL_MASK (0xf << 16)
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#define JZ_DMA_CMD_SRC_WIDTH_MASK (0x3 << 14)
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#define JZ_DMA_CMD_DST_WIDTH_MASK (0x3 << 12)
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#define JZ_DMA_CMD_INTERVAL_LENGTH_MASK (0x7 << 8)
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#define JZ_DMA_CMD_BLOCK_MODE BIT(7)
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#define JZ_DMA_CMD_DESC_VALID BIT(4)
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#define JZ_DMA_CMD_DESC_VALID_MODE BIT(3)
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#define JZ_DMA_CMD_VALID_IRQ_ENABLE BIT(2)
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#define JZ_DMA_CMD_TRANSFER_IRQ_ENABLE BIT(1)
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#define JZ_DMA_CMD_LINK_ENABLE BIT(0)
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#define JZ_DMA_CMD_FLAGS_OFFSET 22
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#define JZ_DMA_CMD_RDIL_OFFSET 16
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#define JZ_DMA_CMD_SRC_WIDTH_OFFSET 14
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#define JZ_DMA_CMD_DST_WIDTH_OFFSET 12
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#define JZ_DMA_CMD_TRANSFER_SIZE_OFFSET 8
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#define JZ_DMA_CMD_MODE_OFFSET 7
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#define JZ_DMA_CTRL_PRIORITY_MASK (0x3 << 8)
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#define JZ_DMA_CTRL_HALT BIT(3)
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#define JZ_DMA_CTRL_ADDRESS_ERROR BIT(2)
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#define JZ_DMA_CTRL_ENABLE BIT(0)
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static void __iomem *jz4740_dma_base;
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static spinlock_t jz4740_dma_lock;
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static inline uint32_t jz4740_dma_read(size_t reg)
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{
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return readl(jz4740_dma_base + reg);
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}
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static inline void jz4740_dma_write(size_t reg, uint32_t val)
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{
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writel(val, jz4740_dma_base + reg);
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}
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static inline void jz4740_dma_write_mask(size_t reg, uint32_t val, uint32_t mask)
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{
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uint32_t val2;
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val2 = jz4740_dma_read(reg);
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val2 &= ~mask;
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val2 |= val;
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jz4740_dma_write(reg, val2);
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}
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struct jz4740_dma_chan {
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unsigned int id;
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void *dev;
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const char *name;
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enum jz4740_dma_flags flags;
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uint32_t transfer_shift;
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jz4740_dma_complete_callback_t complete_cb;
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unsigned used:1;
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};
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#define JZ4740_DMA_CHANNEL(_id) { .id = _id }
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struct jz4740_dma_chan jz4740_dma_channels[] = {
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JZ4740_DMA_CHANNEL(0),
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JZ4740_DMA_CHANNEL(1),
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JZ4740_DMA_CHANNEL(2),
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JZ4740_DMA_CHANNEL(3),
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JZ4740_DMA_CHANNEL(4),
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JZ4740_DMA_CHANNEL(5),
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};
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struct jz4740_dma_chan *jz4740_dma_request(void *dev, const char *name)
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{
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unsigned int i;
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struct jz4740_dma_chan *dma = NULL;
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spin_lock(&jz4740_dma_lock);
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for (i = 0; i < ARRAY_SIZE(jz4740_dma_channels); ++i) {
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if (!jz4740_dma_channels[i].used) {
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dma = &jz4740_dma_channels[i];
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dma->used = 1;
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break;
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}
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}
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spin_unlock(&jz4740_dma_lock);
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if (!dma)
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return NULL;
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dma->dev = dev;
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dma->name = name;
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return dma;
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_request);
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void jz4740_dma_configure(struct jz4740_dma_chan *dma,
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const struct jz4740_dma_config *config)
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{
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uint32_t cmd;
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switch (config->transfer_size) {
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case JZ4740_DMA_TRANSFER_SIZE_2BYTE:
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dma->transfer_shift = 1;
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break;
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case JZ4740_DMA_TRANSFER_SIZE_4BYTE:
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dma->transfer_shift = 2;
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break;
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case JZ4740_DMA_TRANSFER_SIZE_16BYTE:
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dma->transfer_shift = 4;
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break;
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case JZ4740_DMA_TRANSFER_SIZE_32BYTE:
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dma->transfer_shift = 5;
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break;
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default:
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dma->transfer_shift = 0;
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break;
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}
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cmd = config->flags << JZ_DMA_CMD_FLAGS_OFFSET;
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cmd |= config->src_width << JZ_DMA_CMD_SRC_WIDTH_OFFSET;
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cmd |= config->dst_width << JZ_DMA_CMD_DST_WIDTH_OFFSET;
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cmd |= config->transfer_size << JZ_DMA_CMD_TRANSFER_SIZE_OFFSET;
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cmd |= config->mode << JZ_DMA_CMD_MODE_OFFSET;
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cmd |= JZ_DMA_CMD_TRANSFER_IRQ_ENABLE;
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jz4740_dma_write(JZ_REG_DMA_CMD(dma->id), cmd);
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jz4740_dma_write(JZ_REG_DMA_STATUS_CTRL(dma->id), 0);
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jz4740_dma_write(JZ_REG_DMA_REQ_TYPE(dma->id), config->request_type);
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_configure);
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void jz4740_dma_set_src_addr(struct jz4740_dma_chan *dma, dma_addr_t src)
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{
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jz4740_dma_write(JZ_REG_DMA_SRC_ADDR(dma->id), src);
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_set_src_addr);
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void jz4740_dma_set_dst_addr(struct jz4740_dma_chan *dma, dma_addr_t dst)
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{
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jz4740_dma_write(JZ_REG_DMA_DST_ADDR(dma->id), dst);
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_set_dst_addr);
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void jz4740_dma_set_transfer_count(struct jz4740_dma_chan *dma, uint32_t count)
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{
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count >>= dma->transfer_shift;
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jz4740_dma_write(JZ_REG_DMA_TRANSFER_COUNT(dma->id), count);
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_set_transfer_count);
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void jz4740_dma_set_complete_cb(struct jz4740_dma_chan *dma,
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jz4740_dma_complete_callback_t cb)
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{
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dma->complete_cb = cb;
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_set_complete_cb);
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void jz4740_dma_free(struct jz4740_dma_chan *dma)
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{
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dma->dev = NULL;
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dma->complete_cb = NULL;
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dma->used = 0;
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_free);
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void jz4740_dma_enable(struct jz4740_dma_chan *dma)
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{
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jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id),
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JZ_DMA_STATUS_CTRL_NO_DESC | JZ_DMA_STATUS_CTRL_ENABLE,
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JZ_DMA_STATUS_CTRL_HALT | JZ_DMA_STATUS_CTRL_NO_DESC |
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JZ_DMA_STATUS_CTRL_ENABLE);
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jz4740_dma_write_mask(JZ_REG_DMA_CTRL,
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JZ_DMA_CTRL_ENABLE,
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JZ_DMA_CTRL_HALT | JZ_DMA_CTRL_ENABLE);
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_enable);
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void jz4740_dma_disable(struct jz4740_dma_chan *dma)
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{
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jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
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JZ_DMA_STATUS_CTRL_ENABLE);
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_disable);
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uint32_t jz4740_dma_get_residue(const struct jz4740_dma_chan *dma)
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{
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uint32_t residue;
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residue = jz4740_dma_read(JZ_REG_DMA_TRANSFER_COUNT(dma->id));
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return residue << dma->transfer_shift;
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}
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EXPORT_SYMBOL_GPL(jz4740_dma_get_residue);
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static void jz4740_dma_chan_irq(struct jz4740_dma_chan *dma)
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{
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(void) jz4740_dma_read(JZ_REG_DMA_STATUS_CTRL(dma->id));
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jz4740_dma_write_mask(JZ_REG_DMA_STATUS_CTRL(dma->id), 0,
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JZ_DMA_STATUS_CTRL_ENABLE | JZ_DMA_STATUS_CTRL_TRANSFER_DONE);
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if (dma->complete_cb)
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dma->complete_cb(dma, 0, dma->dev);
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}
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static irqreturn_t jz4740_dma_irq(int irq, void *dev_id)
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{
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uint32_t irq_status;
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unsigned int i;
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irq_status = readl(jz4740_dma_base + JZ_REG_DMA_IRQ);
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for (i = 0; i < 6; ++i) {
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if (irq_status & (1 << i))
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jz4740_dma_chan_irq(&jz4740_dma_channels[i]);
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}
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return IRQ_HANDLED;
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}
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static int jz4740_dma_init(void)
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{
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unsigned int ret;
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jz4740_dma_base = ioremap(JZ4740_DMAC_BASE_ADDR, 0x400);
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if (!jz4740_dma_base)
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return -EBUSY;
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spin_lock_init(&jz4740_dma_lock);
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ret = request_irq(JZ4740_IRQ_DMAC, jz4740_dma_irq, 0, "DMA", NULL);
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if (ret)
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printk(KERN_ERR "JZ4740 DMA: Failed to request irq: %d\n", ret);
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return ret;
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}
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arch_initcall(jz4740_dma_init);
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