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linux-pinenote/arch/arm/mach-s3c64xx/pl080.c
Tomasz Figa 1db0287ab1 ARM: s3c64xx: Add support for DMA using generic amba-pl08x driver 
This patch adds all required platform-specific data and initialization
code to support the generic amba-pl08x driver on S3C64xx SoCs.

Also some compatibility definitions are added to make the transition
from legacy API to DMA engine easier. The biggest hack here is passing
const char * pointers through DMA resource, casted to unsigned long,
but this is how Samsung DMA wrappers (used to support both s3c-dma and
DMA engine in drivers) are designed.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
2013-11-24 14:38:24 +00:00

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/*
* Samsung's S3C64XX generic DMA support using amba-pl08x driver.
*
* Copyright (c) 2013 Tomasz Figa <tomasz.figa@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/amba/bus.h>
#include <linux/amba/pl080.h>
#include <linux/amba/pl08x.h>
#include <linux/of.h>
#include <mach/irqs.h>
#include <mach/map.h>
#include "regs-sys.h"
static int pl08x_get_xfer_signal(const struct pl08x_channel_data *cd)
{
return cd->min_signal;
}
static void pl08x_put_xfer_signal(const struct pl08x_channel_data *cd, int ch)
{
}
/*
* DMA0
*/
static struct pl08x_channel_data s3c64xx_dma0_info[] = {
{
.bus_id = "uart0_tx",
.min_signal = 0,
.max_signal = 0,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "uart0_rx",
.min_signal = 1,
.max_signal = 1,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "uart1_tx",
.min_signal = 2,
.max_signal = 2,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "uart1_rx",
.min_signal = 3,
.max_signal = 3,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "uart2_tx",
.min_signal = 4,
.max_signal = 4,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "uart2_rx",
.min_signal = 5,
.max_signal = 5,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "uart3_tx",
.min_signal = 6,
.max_signal = 6,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "uart3_rx",
.min_signal = 7,
.max_signal = 7,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "pcm0_tx",
.min_signal = 8,
.max_signal = 8,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "pcm0_rx",
.min_signal = 9,
.max_signal = 9,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "i2s0_tx",
.min_signal = 10,
.max_signal = 10,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "i2s0_rx",
.min_signal = 11,
.max_signal = 11,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "spi0_tx",
.min_signal = 12,
.max_signal = 12,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "spi0_rx",
.min_signal = 13,
.max_signal = 13,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "i2s2_tx",
.min_signal = 14,
.max_signal = 14,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "i2s2_rx",
.min_signal = 15,
.max_signal = 15,
.periph_buses = PL08X_AHB2,
}
};
struct pl08x_platform_data s3c64xx_dma0_plat_data = {
.memcpy_channel = {
.bus_id = "memcpy",
.cctl_memcpy =
(PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT |
PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT |
PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT |
PL080_CONTROL_PROT_BUFF | PL080_CONTROL_PROT_CACHE |
PL080_CONTROL_PROT_SYS),
},
.lli_buses = PL08X_AHB1,
.mem_buses = PL08X_AHB1,
.get_xfer_signal = pl08x_get_xfer_signal,
.put_xfer_signal = pl08x_put_xfer_signal,
.slave_channels = s3c64xx_dma0_info,
.num_slave_channels = ARRAY_SIZE(s3c64xx_dma0_info),
};
static AMBA_AHB_DEVICE(s3c64xx_dma0, "dma-pl080s.0", 0,
0x75000000, {IRQ_DMA0}, &s3c64xx_dma0_plat_data);
/*
* DMA1
*/
static struct pl08x_channel_data s3c64xx_dma1_info[] = {
{
.bus_id = "pcm1_tx",
.min_signal = 0,
.max_signal = 0,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "pcm1_rx",
.min_signal = 1,
.max_signal = 1,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "i2s1_tx",
.min_signal = 2,
.max_signal = 2,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "i2s1_rx",
.min_signal = 3,
.max_signal = 3,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "spi1_tx",
.min_signal = 4,
.max_signal = 4,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "spi1_rx",
.min_signal = 5,
.max_signal = 5,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "ac97_out",
.min_signal = 6,
.max_signal = 6,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "ac97_in",
.min_signal = 7,
.max_signal = 7,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "ac97_mic",
.min_signal = 8,
.max_signal = 8,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "pwm",
.min_signal = 9,
.max_signal = 9,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "irda",
.min_signal = 10,
.max_signal = 10,
.periph_buses = PL08X_AHB2,
}, {
.bus_id = "external",
.min_signal = 11,
.max_signal = 11,
.periph_buses = PL08X_AHB2,
},
};
struct pl08x_platform_data s3c64xx_dma1_plat_data = {
.memcpy_channel = {
.bus_id = "memcpy",
.cctl_memcpy =
(PL080_BSIZE_4 << PL080_CONTROL_SB_SIZE_SHIFT |
PL080_BSIZE_4 << PL080_CONTROL_DB_SIZE_SHIFT |
PL080_WIDTH_32BIT << PL080_CONTROL_SWIDTH_SHIFT |
PL080_WIDTH_32BIT << PL080_CONTROL_DWIDTH_SHIFT |
PL080_CONTROL_PROT_BUFF | PL080_CONTROL_PROT_CACHE |
PL080_CONTROL_PROT_SYS),
},
.lli_buses = PL08X_AHB1,
.mem_buses = PL08X_AHB1,
.get_xfer_signal = pl08x_get_xfer_signal,
.put_xfer_signal = pl08x_put_xfer_signal,
.slave_channels = s3c64xx_dma1_info,
.num_slave_channels = ARRAY_SIZE(s3c64xx_dma1_info),
};
static AMBA_AHB_DEVICE(s3c64xx_dma1, "dma-pl080s.1", 0,
0x75100000, {IRQ_DMA1}, &s3c64xx_dma1_plat_data);
static int __init s3c64xx_pl080_init(void)
{
/* Set all DMA configuration to be DMA, not SDMA */
writel(0xffffff, S3C64XX_SDMA_SEL);
if (of_have_populated_dt())
return 0;
amba_device_register(&s3c64xx_dma0_device, &iomem_resource);
amba_device_register(&s3c64xx_dma1_device, &iomem_resource);
return 0;
}
arch_initcall(s3c64xx_pl080_init);
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