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ARM: s3c64xx: Add support for DMA using generic amba-pl08x driver

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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>
This commit is contained in:
Tomasz Figa 2013-10-16 21:10:54 +02:00 committed by Mark Brown
parent 1b49f10c69
commit 1db0287ab1
8 changed files with 336 additions and 4 deletions
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1
arch/arm/Kconfig
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@ -723,6 +723,7 @@ config ARCH_S3C64XX
bool "Samsung S3C64XX"
select ARCH_HAS_CPUFREQ
select ARCH_REQUIRE_GPIOLIB
select ARM_AMBA
select ARM_VIC
select CLKDEV_LOOKUP
select CLKSRC_SAMSUNG_PWM

8
arch/arm/mach-s3c64xx/Kconfig
View File

@ -17,9 +17,15 @@ config CPU_S3C6410
help
Enable S3C6410 CPU support
config S3C64XX_PL080
bool "S3C64XX DMA using generic PL08x driver"
select AMBA_PL08X
select SAMSUNG_DMADEV
config S3C64XX_DMA
bool "S3C64XX DMA"
bool "S3C64XX DMA using legacy S3C DMA API"
select S3C_DMA
depends on !S3C64XX_PL080
config S3C64XX_SETUP_SDHCI
bool

1
arch/arm/mach-s3c64xx/Makefile
View File

@ -27,6 +27,7 @@ obj-$(CONFIG_CPU_IDLE) += cpuidle.o
# DMA support
obj-$(CONFIG_S3C64XX_DMA) += dma.o
obj-$(CONFIG_S3C64XX_PL080) += pl080.o
# Device support

5
arch/arm/mach-s3c64xx/common.h
View File

@ -58,4 +58,9 @@ int __init s3c64xx_pm_late_initcall(void);
static inline int s3c64xx_pm_late_initcall(void) { return 0; }
#endif
#ifdef CONFIG_S3C64XX_PL080
extern struct pl08x_platform_data s3c64xx_dma0_plat_data;
extern struct pl08x_platform_data s3c64xx_dma1_plat_data;
#endif
#endif /* __ARCH_ARM_MACH_S3C64XX_COMMON_H */

63
arch/arm/mach-s3c64xx/include/mach/dma.h
View File

@ -11,6 +11,8 @@
#ifndef __ASM_ARCH_DMA_H
#define __ASM_ARCH_DMA_H __FILE__
#ifdef CONFIG_S3C64XX_DMA
#define S3C_DMA_CHANNELS (16)
/* see mach-s3c2410/dma.h for notes on dma channel numbers */
@ -128,4 +130,65 @@ struct s3c2410_dma_chan {
#include <plat/dma-core.h>
#else
#define S3C64XX_DMA_CHAN(name) ((unsigned long)(name))
/* DMA0/SDMA0 */
#define DMACH_UART0 S3C64XX_DMA_CHAN("uart0_tx")
#define DMACH_UART0_SRC2 S3C64XX_DMA_CHAN("uart0_rx")
#define DMACH_UART1 S3C64XX_DMA_CHAN("uart1_tx")
#define DMACH_UART1_SRC2 S3C64XX_DMA_CHAN("uart1_rx")
#define DMACH_UART2 S3C64XX_DMA_CHAN("uart2_tx")
#define DMACH_UART2_SRC2 S3C64XX_DMA_CHAN("uart2_rx")
#define DMACH_UART3 S3C64XX_DMA_CHAN("uart3_tx")
#define DMACH_UART3_SRC2 S3C64XX_DMA_CHAN("uart3_rx")
#define DMACH_PCM0_TX S3C64XX_DMA_CHAN("pcm0_tx")
#define DMACH_PCM0_RX S3C64XX_DMA_CHAN("pcm0_rx")
#define DMACH_I2S0_OUT S3C64XX_DMA_CHAN("i2s0_tx")
#define DMACH_I2S0_IN S3C64XX_DMA_CHAN("i2s0_rx")
#define DMACH_SPI0_TX S3C64XX_DMA_CHAN("spi0_tx")
#define DMACH_SPI0_RX S3C64XX_DMA_CHAN("spi0_rx")
#define DMACH_HSI_I2SV40_TX S3C64XX_DMA_CHAN("i2s2_tx")
#define DMACH_HSI_I2SV40_RX S3C64XX_DMA_CHAN("i2s2_rx")
/* DMA1/SDMA1 */
#define DMACH_PCM1_TX S3C64XX_DMA_CHAN("pcm1_tx")
#define DMACH_PCM1_RX S3C64XX_DMA_CHAN("pcm1_rx")
#define DMACH_I2S1_OUT S3C64XX_DMA_CHAN("i2s1_tx")
#define DMACH_I2S1_IN S3C64XX_DMA_CHAN("i2s1_rx")
#define DMACH_SPI1_TX S3C64XX_DMA_CHAN("spi1_tx")
#define DMACH_SPI1_RX S3C64XX_DMA_CHAN("spi1_rx")
#define DMACH_AC97_PCMOUT S3C64XX_DMA_CHAN("ac97_out")
#define DMACH_AC97_PCMIN S3C64XX_DMA_CHAN("ac97_in")
#define DMACH_AC97_MICIN S3C64XX_DMA_CHAN("ac97_mic")
#define DMACH_PWM S3C64XX_DMA_CHAN("pwm")
#define DMACH_IRDA S3C64XX_DMA_CHAN("irda")
#define DMACH_EXTERNAL S3C64XX_DMA_CHAN("external")
#define DMACH_SECURITY_RX S3C64XX_DMA_CHAN("sec_rx")
#define DMACH_SECURITY_TX S3C64XX_DMA_CHAN("sec_tx")
enum dma_ch {
DMACH_MAX = 32
};
struct s3c2410_dma_client {
char *name;
};
static inline bool samsung_dma_has_circular(void)
{
return true;
}
static inline bool samsung_dma_is_dmadev(void)
{
return true;
}
#include <linux/amba/pl08x.h>
#include <plat/dma-ops.h>
#endif
#endif /* __ASM_ARCH_IRQ_H */

244
arch/arm/mach-s3c64xx/pl080.c Normal file
View File

@ -0,0 +1,244 @@
/*
* 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);

10
arch/arm/plat-samsung/devs.c
View File

@ -1468,6 +1468,8 @@ void __init s3c64xx_spi0_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
pd.cfg_gpio = (cfg_gpio) ? cfg_gpio : s3c64xx_spi0_cfg_gpio;
#if defined(CONFIG_PL330_DMA)
pd.filter = pl330_filter;
#elif defined(CONFIG_S3C64XX_PL080)
pd.filter = pl08x_filter_id;
#elif defined(CONFIG_S3C24XX_DMAC)
pd.filter = s3c24xx_dma_filter;
#endif
@ -1509,8 +1511,10 @@ void __init s3c64xx_spi1_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
pd.num_cs = num_cs;
pd.src_clk_nr = src_clk_nr;
pd.cfg_gpio = (cfg_gpio) ? cfg_gpio : s3c64xx_spi1_cfg_gpio;
#ifdef CONFIG_PL330_DMA
#if defined(CONFIG_PL330_DMA)
pd.filter = pl330_filter;
#elif defined(CONFIG_S3C64XX_PL080)
pd.filter = pl08x_filter_id;
#endif
s3c_set_platdata(&pd, sizeof(pd), &s3c64xx_device_spi1);
@ -1550,8 +1554,10 @@ void __init s3c64xx_spi2_set_platdata(int (*cfg_gpio)(void), int src_clk_nr,
pd.num_cs = num_cs;
pd.src_clk_nr = src_clk_nr;
pd.cfg_gpio = (cfg_gpio) ? cfg_gpio : s3c64xx_spi2_cfg_gpio;
#ifdef CONFIG_PL330_DMA
#if defined(CONFIG_PL330_DMA)
pd.filter = pl330_filter;
#elif defined(CONFIG_S3C64XX_PL080)
pd.filter = pl08x_filter_id;
#endif
s3c_set_platdata(&pd, sizeof(pd), &s3c64xx_device_spi2);

8
arch/arm/plat-samsung/dma-ops.c
View File

@ -18,6 +18,12 @@
#include <mach/dma.h>
#if defined(CONFIG_PL330_DMA)
#define dma_filter pl330_filter
#elif defined(CONFIG_S3C64XX_PL080)
#define dma_filter pl08x_filter_id
#endif
static unsigned samsung_dmadev_request(enum dma_ch dma_ch,
struct samsung_dma_req *param,
struct device *dev, char *ch_name)
@ -30,7 +36,7 @@ static unsigned samsung_dmadev_request(enum dma_ch dma_ch,
if (dev->of_node)
return (unsigned)dma_request_slave_channel(dev, ch_name);
else
return (unsigned)dma_request_channel(mask, pl330_filter,
return (unsigned)dma_request_channel(mask, dma_filter,
(void *)dma_ch);
}