[ARM] S3C64XX: DMA support

Add support for the DMA blocks in the S3C64XX series of CPUS,
which are based on the ARM PL080 PrimeCell system.

Unfortunately, these DMA controllers diverge from the PL080
design by adding another DMA controller register and
configuration for OneNAND.

Signed-off-by: Ben Dooks <ben@simtec.co.uk>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>

arch/arm/include/asm/hardware/pl080.h

@@ -0,0 +1,138 @@
+/* arch/arm/include/asm/hardware/pl080.h
+ *
+ * Copyright 2008 Openmoko, Inc.
+ * Copyright 2008 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * ARM PrimeCell PL080 DMA controller
+ *
+ * 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.
+*/
+
+/* Note, there are some Samsung updates to this controller block which
+ * make it not entierly compatible with the PL080 specification from
+ * ARM. When in doubt, check the Samsung documentation first.
+ *
+ * The Samsung defines are PL080S, and add an extra controll register,
+ * the ability to move more than 2^11 counts of data and some extra
+ * OneNAND features.
+*/
+
+#define PL080_INT_STATUS			(0x00)
+#define PL080_TC_STATUS				(0x04)
+#define PL080_TC_CLEAR				(0x08)
+#define PL080_ERR_STATUS			(0x0C)
+#define PL080_ERR_CLEAR				(0x10)
+#define PL080_RAW_TC_STATUS			(0x14)
+#define PL080_RAW_ERR_STATUS			(0x18)
+#define PL080_EN_CHAN				(0x1c)
+#define PL080_SOFT_BREQ				(0x20)
+#define PL080_SOFT_SREQ				(0x24)
+#define PL080_SOFT_LBREQ			(0x28)
+#define PL080_SOFT_LSREQ			(0x2C)
+
+#define PL080_CONFIG				(0x30)
+#define PL080_CONFIG_M2_BE			(1 << 2)
+#define PL080_CONFIG_M1_BE			(1 << 1)
+#define PL080_CONFIG_ENABLE			(1 << 0)
+
+#define PL080_SYNC				(0x34)
+
+/* Per channel configuration registers */
+
+#define PL008_Cx_STRIDE				(0x20)
+#define PL080_Cx_BASE(x)			((0x100 + (x * 0x20)))
+#define PL080_Cx_SRC_ADDR(x)			((0x100 + (x * 0x20)))
+#define PL080_Cx_DST_ADDR(x)			((0x104 + (x * 0x20)))
+#define PL080_Cx_LLI(x)				((0x108 + (x * 0x20)))
+#define PL080_Cx_CONTROL(x)			((0x10C + (x * 0x20)))
+#define PL080_Cx_CONFIG(x)			((0x110 + (x * 0x20)))
+#define PL080S_Cx_CONTROL2(x)			((0x110 + (x * 0x20)))
+#define PL080S_Cx_CONFIG(x)			((0x114 + (x * 0x20)))
+
+#define PL080_CH_SRC_ADDR			(0x00)
+#define PL080_CH_DST_ADDR			(0x04)
+#define PL080_CH_LLI				(0x08)
+#define PL080_CH_CONTROL			(0x0C)
+#define PL080_CH_CONFIG				(0x10)
+#define PL080S_CH_CONTROL2			(0x10)
+#define PL080S_CH_CONFIG			(0x14)
+
+#define PL080_LLI_ADDR_MASK			(0x3fffffff << 2)
+#define PL080_LLI_ADDR_SHIFT			(2)
+#define PL080_LLI_LM_AHB2			(1 << 0)
+
+#define PL080_CONTROL_TC_IRQ_EN			(1 << 31)
+#define PL080_CONTROL_PROT_MASK			(0x7 << 28)
+#define PL080_CONTROL_PROT_SHIFT		(28)
+#define PL080_CONTROL_PROT_SYS			(1 << 28)
+#define PL080_CONTROL_DST_INCR			(1 << 27)
+#define PL080_CONTROL_SRC_INCR			(1 << 26)
+#define PL080_CONTROL_DST_AHB2			(1 << 25)
+#define PL080_CONTROL_SRC_AHB2			(1 << 24)
+#define PL080_CONTROL_DWIDTH_MASK		(0x7 << 21)
+#define PL080_CONTROL_DWIDTH_SHIFT		(21)
+#define PL080_CONTROL_SWIDTH_MASK		(0x7 << 18)
+#define PL080_CONTROL_SWIDTH_SHIFT		(18)
+#define PL080_CONTROL_DB_SIZE_MASK		(0x7 << 15)
+#define PL080_CONTROL_DB_SIZE_SHIFT		(15)
+#define PL080_CONTROL_SB_SIZE_MASK		(0x7 << 12)
+#define PL080_CONTROL_SB_SIZE_SHIFT		(12)
+#define PL080_CONTROL_TRANSFER_SIZE_MASK	(0xfff << 0)
+#define PL080_CONTROL_TRANSFER_SIZE_SHIFT	(0)
+
+#define PL080_BSIZE_1				(0x0)
+#define PL080_BSIZE_4				(0x1)
+#define PL080_BSIZE_8				(0x2)
+#define PL080_BSIZE_16				(0x3)
+#define PL080_BSIZE_32				(0x4)
+#define PL080_BSIZE_64				(0x5)
+#define PL080_BSIZE_128				(0x6)
+#define PL080_BSIZE_256				(0x7)
+
+#define PL080_WIDTH_8BIT			(0x0)
+#define PL080_WIDTH_16BIT			(0x1)
+#define PL080_WIDTH_32BIT			(0x2)
+
+#define PL080_CONFIG_HALT			(1 << 18)
+#define PL080_CONFIG_ACTIVE			(1 << 17)  /* RO */
+#define PL080_CONFIG_LOCK			(1 << 16)
+#define PL080_CONFIG_TC_IRQ_MASK		(1 << 15)
+#define PL080_CONFIG_ERR_IRQ_MASK		(1 << 14)
+#define PL080_CONFIG_FLOW_CONTROL_MASK		(0x7 << 11)
+#define PL080_CONFIG_FLOW_CONTROL_SHIFT		(11)
+#define PL080_CONFIG_DST_SEL_MASK		(0xf << 6)
+#define PL080_CONFIG_DST_SEL_SHIFT		(6)
+#define PL080_CONFIG_SRC_SEL_MASK		(0xf << 1)
+#define PL080_CONFIG_SRC_SEL_SHIFT		(1)
+#define PL080_CONFIG_ENABLE			(1 << 0)
+
+#define PL080_FLOW_MEM2MEM			(0x0)
+#define PL080_FLOW_MEM2PER			(0x1)
+#define PL080_FLOW_PER2MEM			(0x2)
+#define PL080_FLOW_SRC2DST			(0x3)
+#define PL080_FLOW_SRC2DST_DST			(0x4)
+#define PL080_FLOW_MEM2PER_PER			(0x5)
+#define PL080_FLOW_PER2MEM_PER			(0x6)
+#define PL080_FLOW_SRC2DST_SRC			(0x7)
+
+/* DMA linked list chain structure */
+
+struct pl080_lli {
+	u32	src_addr;
+	u32	dst_addr;
+	u32	next_lli;
+	u32	control0;
+};
+
+struct pl080s_lli {
+	u32	src_addr;
+	u32	dst_addr;
+	u32	next_lli;
+	u32	control0;
+	u32	control1;
+};
+

arch/arm/mach-s3c6400/include/mach/dma.h

@@ -11,6 +11,63 @@
 #ifndef __ASM_ARCH_DMA_H
 #define __ASM_ARCH_DMA_H __FILE__
 
-/* currently nothing here, placeholder */
+#define S3C_DMA_CHANNELS	(16)
+
+/* see mach-s3c2410/dma.h for notes on dma channel numbers */
+
+/* Note, for the S3C64XX architecture we keep the DMACH_
+ * defines in the order they are allocated to [S]DMA0/[S]DMA1
+ * so that is easy to do DHACH_ -> DMA controller conversion
+ */
+enum dma_ch {
+	/* DMA0/SDMA0 */
+	DMACH_UART0 = 0,
+	DMACH_UART0_SRC2,
+	DMACH_UART1,
+	DMACH_UART1_SRC2,
+	DMACH_UART2,
+	DMACH_UART2_SRC2,
+	DMACH_UART3,
+	DMACH_UART3_SRC2,
+	DMACH_PCM0_TX,
+	DMACH_PCM0_RX,
+	DMACH_I2S0_OUT,
+	DMACH_I2S0_IN,
+	DMACH_SPI0_TX,
+	DMACH_SPI0_RX,
+	DMACH_HSI_I2SV40_TX,
+	DMACH_HSI_I2SV40_RX,
+
+	/* DMA1/SDMA1 */
+	DMACH_PCM1_TX = 16,
+	DMACH_PCM1_RX,
+	DMACH_I2S1_OUT,
+	DMACH_I2S1_IN,
+	DMACH_SPI1_TX,
+	DMACH_SPI1_RX,
+	DMACH_AC97_PCMOUT,
+	DMACH_AC97_PCMIN,
+	DMACH_AC97_MICIN,
+	DMACH_PWM,
+	DMACH_IRDA,
+	DMACH_EXTERNAL,
+	DMACH_RES1,
+	DMACH_RES2,
+	DMACH_SECURITY_RX,	/* SDMA1 only */
+	DMACH_SECURITY_TX,	/* SDMA1 only */
+	DMACH_MAX		/* the end */
+};
+
+static __inline__ int s3c_dma_has_circular(void)
+{
+	/* we will be supporting ciruclar buffers as soon as we have DMA
+	 * engine support.
+	 */
+	return 1;
+}
+
+#define S3C2410_DMAF_CIRCULAR		(1 << 0)
+
+#include <plat/dma.h>
 
 #endif /* __ASM_ARCH_IRQ_H */

arch/arm/plat-s3c64xx/Kconfig

@@ -38,6 +38,10 @@ config CPU_S3C6400_CLOCK
 	  Common clock support code for the S3C6400 that is shared
 	  by other CPUs in the series, such as the S3C6410.
 
+config S3C64XX_DMA
+	bool "S3C64XX DMA"
+	select S3C_DMA
+
 # platform specific device setup
 
 config S3C64XX_SETUP_I2C0

arch/arm/plat-s3c64xx/Makefile

@@ -24,6 +24,10 @@ obj-y				+= gpiolib.o
 obj-$(CONFIG_CPU_S3C6400_INIT)	+= s3c6400-init.o
 obj-$(CONFIG_CPU_S3C6400_CLOCK)	+= s3c6400-clock.o
 
+# DMA support
+
+obj-$(CONFIG_S3C64XX_DMA)	+= dma.o
+
 # Device setup
 
 obj-$(CONFIG_S3C64XX_SETUP_I2C0) += setup-i2c0.o