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>

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c1f1a7e..ba0e232 100644 (file)
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -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

diff --git a/arch/arm/mach-s3c64xx/Kconfig b/arch/arm/mach-s3c64xx/Kconfig
index 2cb8dc5..d8e0288 100644 (file)
--- a/arch/arm/mach-s3c64xx/Kconfig
+++ b/arch/arm/mach-s3c64xx/Kconfig
@@ -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

diff --git a/arch/arm/mach-s3c64xx/Makefile b/arch/arm/mach-s3c64xx/Makefile
index 6faedcf..e8e9a46 100644 (file)
--- a/arch/arm/mach-s3c64xx/Makefile
+++ b/arch/arm/mach-s3c64xx/Makefile
@@ -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
 

diff --git a/arch/arm/mach-s3c64xx/common.h b/arch/arm/mach-s3c64xx/common.h
index bd3bd56..7043e7a 100644 (file)
--- a/arch/arm/mach-s3c64xx/common.h
+++ b/arch/arm/mach-s3c64xx/common.h
@@ -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 */

diff --git a/arch/arm/mach-s3c64xx/include/mach/dma.h b/arch/arm/mach-s3c64xx/include/mach/dma.h
index fe1a98c..26a6bc3 100644 (file)
--- a/arch/arm/mach-s3c64xx/include/mach/dma.h
+++ b/arch/arm/mach-s3c64xx/include/mach/dma.h
@@ -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 */

diff --git a/arch/arm/mach-s3c64xx/pl080.c b/arch/arm/mach-s3c64xx/pl080.c
new file mode 100644 (file)
index 0000000..901a984
--- /dev/null
+++ b/arch/arm/mach-s3c64xx/pl080.c
@@ -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);

diff --git a/arch/arm/plat-samsung/devs.c b/arch/arm/plat-samsung/devs.c
index 99a3590..ac07e87 100644 (file)
--- a/arch/arm/plat-samsung/devs.c
+++ b/arch/arm/plat-samsung/devs.c
@@ -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);

diff --git a/arch/arm/plat-samsung/dma-ops.c b/arch/arm/plat-samsung/dma-ops.c
index ec0d731..886326e 100644 (file)
--- a/arch/arm/plat-samsung/dma-ops.c
+++ b/arch/arm/plat-samsung/dma-ops.c
@@ -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);
 }