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@@ -1,9 +1,9 @@
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/* linux/arch/arm/mach-s3c2410/dma.c
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*
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- * Copyright (c) 2003-2005,2006 Simtec Electronics
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+ * Copyright (c) 2006 Simtec Electronics
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* Ben Dooks <ben@simtec.co.uk>
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*
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- * S3C2410 DMA core
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+ * S3C2410 DMA selection
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*
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* http://armlinux.simtec.co.uk/
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*
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@@ -12,1430 +12,170 @@
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* published by the Free Software Foundation.
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*/
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-
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-#ifdef CONFIG_S3C2410_DMA_DEBUG
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-#define DEBUG
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-#endif
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-
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-#include <linux/module.h>
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+#include <linux/kernel.h>
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#include <linux/init.h>
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-#include <linux/sched.h>
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-#include <linux/spinlock.h>
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-#include <linux/interrupt.h>
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#include <linux/sysdev.h>
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-#include <linux/slab.h>
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-#include <linux/errno.h>
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-#include <linux/delay.h>
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+#include <linux/serial_core.h>
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-#include <asm/system.h>
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-#include <asm/irq.h>
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-#include <asm/hardware.h>
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-#include <asm/io.h>
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#include <asm/dma.h>
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-
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-#include <asm/mach/dma.h>
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-#include <asm/arch/map.h>
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-
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-#include "dma.h"
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-
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-/* io map for dma */
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-static void __iomem *dma_base;
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-static struct kmem_cache *dma_kmem;
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-
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-struct s3c24xx_dma_selection dma_sel;
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-
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-/* dma channel state information */
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-struct s3c2410_dma_chan s3c2410_chans[S3C2410_DMA_CHANNELS];
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-
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-/* debugging functions */
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-
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-#define BUF_MAGIC (0xcafebabe)
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-
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-#define dmawarn(fmt...) printk(KERN_DEBUG fmt)
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-
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-#define dma_regaddr(chan, reg) ((chan)->regs + (reg))
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-
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-#if 1
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-#define dma_wrreg(chan, reg, val) writel((val), (chan)->regs + (reg))
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-#else
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-static inline void
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-dma_wrreg(struct s3c2410_dma_chan *chan, int reg, unsigned long val)
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-{
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- pr_debug("writing %08x to register %08x\n",(unsigned int)val,reg);
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- writel(val, dma_regaddr(chan, reg));
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-}
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-#endif
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-
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-#define dma_rdreg(chan, reg) readl((chan)->regs + (reg))
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-
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-/* captured register state for debug */
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-
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-struct s3c2410_dma_regstate {
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- unsigned long dcsrc;
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- unsigned long disrc;
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- unsigned long dstat;
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- unsigned long dcon;
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- unsigned long dmsktrig;
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+#include <asm/arch/dma.h>
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+
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+#include <asm/plat-s3c24xx/cpu.h>
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+#include <asm/plat-s3c24xx/dma.h>
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+
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+#include <asm/arch/regs-serial.h>
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+#include <asm/arch/regs-gpio.h>
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+#include <asm/arch/regs-ac97.h>
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+#include <asm/arch/regs-mem.h>
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+#include <asm/arch/regs-lcd.h>
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+#include <asm/arch/regs-sdi.h>
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+#include <asm/arch/regs-iis.h>
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+#include <asm/arch/regs-spi.h>
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+
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+static struct s3c24xx_dma_map __initdata s3c2410_dma_mappings[] = {
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+ [DMACH_XD0] = {
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+ .name = "xdreq0",
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+ .channels[0] = S3C2410_DCON_CH0_XDREQ0 | DMA_CH_VALID,
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+ },
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+ [DMACH_XD1] = {
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+ .name = "xdreq1",
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+ .channels[1] = S3C2410_DCON_CH1_XDREQ1 | DMA_CH_VALID,
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+ },
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+ [DMACH_SDI] = {
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+ .name = "sdi",
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+ .channels[0] = S3C2410_DCON_CH0_SDI | DMA_CH_VALID,
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+ .channels[2] = S3C2410_DCON_CH2_SDI | DMA_CH_VALID,
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+ .channels[3] = S3C2410_DCON_CH3_SDI | DMA_CH_VALID,
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+ .hw_addr.to = S3C2410_PA_IIS + S3C2410_IISFIFO,
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+ .hw_addr.from = S3C2410_PA_IIS + S3C2410_IISFIFO,
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+ },
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+ [DMACH_SPI0] = {
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+ .name = "spi0",
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+ .channels[1] = S3C2410_DCON_CH1_SPI | DMA_CH_VALID,
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+ .hw_addr.to = S3C2410_PA_SPI + S3C2410_SPTDAT,
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+ .hw_addr.from = S3C2410_PA_SPI + S3C2410_SPRDAT,
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+ },
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+ [DMACH_SPI1] = {
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+ .name = "spi1",
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+ .channels[3] = S3C2410_DCON_CH3_SPI | DMA_CH_VALID,
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+ .hw_addr.to = S3C2410_PA_SPI + 0x20 + S3C2410_SPTDAT,
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+ .hw_addr.from = S3C2410_PA_SPI + 0x20 + S3C2410_SPRDAT,
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+ },
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+ [DMACH_UART0] = {
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+ .name = "uart0",
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+ .channels[0] = S3C2410_DCON_CH0_UART0 | DMA_CH_VALID,
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+ .hw_addr.to = S3C2410_PA_UART0 + S3C2410_UTXH,
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+ .hw_addr.from = S3C2410_PA_UART0 + S3C2410_URXH,
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+ },
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+ [DMACH_UART1] = {
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+ .name = "uart1",
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+ .channels[1] = S3C2410_DCON_CH1_UART1 | DMA_CH_VALID,
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+ .hw_addr.to = S3C2410_PA_UART1 + S3C2410_UTXH,
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+ .hw_addr.from = S3C2410_PA_UART1 + S3C2410_URXH,
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+ },
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+ [DMACH_UART2] = {
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+ .name = "uart2",
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+ .channels[3] = S3C2410_DCON_CH3_UART2 | DMA_CH_VALID,
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+ .hw_addr.to = S3C2410_PA_UART2 + S3C2410_UTXH,
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+ .hw_addr.from = S3C2410_PA_UART2 + S3C2410_URXH,
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+ },
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+ [DMACH_TIMER] = {
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+ .name = "timer",
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+ .channels[0] = S3C2410_DCON_CH0_TIMER | DMA_CH_VALID,
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+ .channels[2] = S3C2410_DCON_CH2_TIMER | DMA_CH_VALID,
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+ .channels[3] = S3C2410_DCON_CH3_TIMER | DMA_CH_VALID,
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+ },
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+ [DMACH_I2S_IN] = {
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+ .name = "i2s-sdi",
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+ .channels[1] = S3C2410_DCON_CH1_I2SSDI | DMA_CH_VALID,
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+ .channels[2] = S3C2410_DCON_CH2_I2SSDI | DMA_CH_VALID,
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+ .hw_addr.from = S3C2410_PA_IIS + S3C2410_IISFIFO,
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+ },
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+ [DMACH_I2S_OUT] = {
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+ .name = "i2s-sdo",
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+ .channels[2] = S3C2410_DCON_CH2_I2SSDO | DMA_CH_VALID,
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+ .hw_addr.to = S3C2410_PA_IIS + S3C2410_IISFIFO,
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+ },
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+ [DMACH_USB_EP1] = {
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+ .name = "usb-ep1",
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+ .channels[0] = S3C2410_DCON_CH0_USBEP1 | DMA_CH_VALID,
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+ },
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+ [DMACH_USB_EP2] = {
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+ .name = "usb-ep2",
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+ .channels[1] = S3C2410_DCON_CH1_USBEP2 | DMA_CH_VALID,
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+ },
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+ [DMACH_USB_EP3] = {
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+ .name = "usb-ep3",
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+ .channels[2] = S3C2410_DCON_CH2_USBEP3 | DMA_CH_VALID,
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+ },
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+ [DMACH_USB_EP4] = {
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+ .name = "usb-ep4",
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+ .channels[3] =S3C2410_DCON_CH3_USBEP4 | DMA_CH_VALID,
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+ },
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};
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-#ifdef CONFIG_S3C2410_DMA_DEBUG
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-
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-/* dmadbg_showregs
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- *
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- * simple debug routine to print the current state of the dma registers
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-*/
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-
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-static void
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-dmadbg_capture(struct s3c2410_dma_chan *chan, struct s3c2410_dma_regstate *regs)
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-{
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- regs->dcsrc = dma_rdreg(chan, S3C2410_DMA_DCSRC);
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- regs->disrc = dma_rdreg(chan, S3C2410_DMA_DISRC);
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- regs->dstat = dma_rdreg(chan, S3C2410_DMA_DSTAT);
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- regs->dcon = dma_rdreg(chan, S3C2410_DMA_DCON);
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- regs->dmsktrig = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
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-}
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-
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-static void
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-dmadbg_dumpregs(const char *fname, int line, struct s3c2410_dma_chan *chan,
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- struct s3c2410_dma_regstate *regs)
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-{
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- printk(KERN_DEBUG "dma%d: %s:%d: DCSRC=%08lx, DISRC=%08lx, DSTAT=%08lx DMT=%02lx, DCON=%08lx\n",
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- chan->number, fname, line,
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- regs->dcsrc, regs->disrc, regs->dstat, regs->dmsktrig,
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- regs->dcon);
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-}
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-
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-static void
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-dmadbg_showchan(const char *fname, int line, struct s3c2410_dma_chan *chan)
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-{
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- struct s3c2410_dma_regstate state;
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-
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- dmadbg_capture(chan, &state);
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-
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- printk(KERN_DEBUG "dma%d: %s:%d: ls=%d, cur=%p, %p %p\n",
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- chan->number, fname, line, chan->load_state,
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- chan->curr, chan->next, chan->end);
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-
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- dmadbg_dumpregs(fname, line, chan, &state);
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-}
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-
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-static void
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-dmadbg_showregs(const char *fname, int line, struct s3c2410_dma_chan *chan)
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-{
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- struct s3c2410_dma_regstate state;
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-
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- dmadbg_capture(chan, &state);
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- dmadbg_dumpregs(fname, line, chan, &state);
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-}
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-
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-#define dbg_showregs(chan) dmadbg_showregs(__FUNCTION__, __LINE__, (chan))
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-#define dbg_showchan(chan) dmadbg_showchan(__FUNCTION__, __LINE__, (chan))
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-#else
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-#define dbg_showregs(chan) do { } while(0)
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-#define dbg_showchan(chan) do { } while(0)
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-#endif /* CONFIG_S3C2410_DMA_DEBUG */
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-
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-static struct s3c2410_dma_chan *dma_chan_map[DMACH_MAX];
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-
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-/* lookup_dma_channel
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- *
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- * change the dma channel number given into a real dma channel id
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-*/
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-
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-static struct s3c2410_dma_chan *lookup_dma_channel(unsigned int channel)
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-{
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- if (channel & DMACH_LOW_LEVEL)
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- return &s3c2410_chans[channel & ~DMACH_LOW_LEVEL];
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- else
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- return dma_chan_map[channel];
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-}
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-
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-/* s3c2410_dma_stats_timeout
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- *
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- * Update DMA stats from timeout info
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-*/
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-
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-static void
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-s3c2410_dma_stats_timeout(struct s3c2410_dma_stats *stats, int val)
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+static void s3c2410_dma_select(struct s3c2410_dma_chan *chan,
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+ struct s3c24xx_dma_map *map)
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{
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- if (stats == NULL)
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- return;
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-
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- if (val > stats->timeout_longest)
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- stats->timeout_longest = val;
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- if (val < stats->timeout_shortest)
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- stats->timeout_shortest = val;
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-
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- stats->timeout_avg += val;
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+ chan->dcon = map->channels[chan->number] & ~DMA_CH_VALID;
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}
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-/* s3c2410_dma_waitforload
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- *
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- * wait for the DMA engine to load a buffer, and update the state accordingly
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-*/
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-
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-static int
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-s3c2410_dma_waitforload(struct s3c2410_dma_chan *chan, int line)
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-{
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- int timeout = chan->load_timeout;
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- int took;
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-
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- if (chan->load_state != S3C2410_DMALOAD_1LOADED) {
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- printk(KERN_ERR "dma%d: s3c2410_dma_waitforload() called in loadstate %d from line %d\n", chan->number, chan->load_state, line);
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- return 0;
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- }
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-
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- if (chan->stats != NULL)
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- chan->stats->loads++;
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-
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- while (--timeout > 0) {
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- if ((dma_rdreg(chan, S3C2410_DMA_DSTAT) << (32-20)) != 0) {
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- took = chan->load_timeout - timeout;
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-
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- s3c2410_dma_stats_timeout(chan->stats, took);
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-
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- switch (chan->load_state) {
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- case S3C2410_DMALOAD_1LOADED:
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- chan->load_state = S3C2410_DMALOAD_1RUNNING;
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- break;
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-
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- default:
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- printk(KERN_ERR "dma%d: unknown load_state in s3c2410_dma_waitforload() %d\n", chan->number, chan->load_state);
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- }
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-
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- return 1;
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- }
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- }
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-
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- if (chan->stats != NULL) {
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- chan->stats->timeout_failed++;
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- }
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-
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- return 0;
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-}
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-
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-
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-
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-/* s3c2410_dma_loadbuffer
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- *
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- * load a buffer, and update the channel state
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-*/
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-
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-static inline int
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-s3c2410_dma_loadbuffer(struct s3c2410_dma_chan *chan,
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- struct s3c2410_dma_buf *buf)
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-{
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- unsigned long reload;
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-
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- pr_debug("s3c2410_chan_loadbuffer: loading buff %p (0x%08lx,0x%06x)\n",
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- buf, (unsigned long)buf->data, buf->size);
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-
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- if (buf == NULL) {
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- dmawarn("buffer is NULL\n");
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- return -EINVAL;
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- }
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-
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- /* check the state of the channel before we do anything */
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-
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- if (chan->load_state == S3C2410_DMALOAD_1LOADED) {
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- dmawarn("load_state is S3C2410_DMALOAD_1LOADED\n");
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- }
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-
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- if (chan->load_state == S3C2410_DMALOAD_1LOADED_1RUNNING) {
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- dmawarn("state is S3C2410_DMALOAD_1LOADED_1RUNNING\n");
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- }
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-
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- /* it would seem sensible if we are the last buffer to not bother
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- * with the auto-reload bit, so that the DMA engine will not try
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- * and load another transfer after this one has finished...
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- */
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- if (chan->load_state == S3C2410_DMALOAD_NONE) {
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- pr_debug("load_state is none, checking for noreload (next=%p)\n",
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- buf->next);
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- reload = (buf->next == NULL) ? S3C2410_DCON_NORELOAD : 0;
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- } else {
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- //pr_debug("load_state is %d => autoreload\n", chan->load_state);
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- reload = S3C2410_DCON_AUTORELOAD;
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- }
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-
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- if ((buf->data & 0xf0000000) != 0x30000000) {
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- dmawarn("dmaload: buffer is %p\n", (void *)buf->data);
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- }
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-
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- writel(buf->data, chan->addr_reg);
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-
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- dma_wrreg(chan, S3C2410_DMA_DCON,
|
|
|
- chan->dcon | reload | (buf->size/chan->xfer_unit));
|
|
|
-
|
|
|
- chan->next = buf->next;
|
|
|
-
|
|
|
- /* update the state of the channel */
|
|
|
-
|
|
|
- switch (chan->load_state) {
|
|
|
- case S3C2410_DMALOAD_NONE:
|
|
|
- chan->load_state = S3C2410_DMALOAD_1LOADED;
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_1RUNNING:
|
|
|
- chan->load_state = S3C2410_DMALOAD_1LOADED_1RUNNING;
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- dmawarn("dmaload: unknown state %d in loadbuffer\n",
|
|
|
- chan->load_state);
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* s3c2410_dma_call_op
|
|
|
- *
|
|
|
- * small routine to call the op routine with the given op if it has been
|
|
|
- * registered
|
|
|
-*/
|
|
|
-
|
|
|
-static void
|
|
|
-s3c2410_dma_call_op(struct s3c2410_dma_chan *chan, enum s3c2410_chan_op op)
|
|
|
-{
|
|
|
- if (chan->op_fn != NULL) {
|
|
|
- (chan->op_fn)(chan, op);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* s3c2410_dma_buffdone
|
|
|
- *
|
|
|
- * small wrapper to check if callback routine needs to be called, and
|
|
|
- * if so, call it
|
|
|
-*/
|
|
|
-
|
|
|
-static inline void
|
|
|
-s3c2410_dma_buffdone(struct s3c2410_dma_chan *chan, struct s3c2410_dma_buf *buf,
|
|
|
- enum s3c2410_dma_buffresult result)
|
|
|
-{
|
|
|
-#if 0
|
|
|
- pr_debug("callback_fn=%p, buf=%p, id=%p, size=%d, result=%d\n",
|
|
|
- chan->callback_fn, buf, buf->id, buf->size, result);
|
|
|
-#endif
|
|
|
-
|
|
|
- if (chan->callback_fn != NULL) {
|
|
|
- (chan->callback_fn)(chan, buf->id, buf->size, result);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* s3c2410_dma_start
|
|
|
- *
|
|
|
- * start a dma channel going
|
|
|
-*/
|
|
|
-
|
|
|
-static int s3c2410_dma_start(struct s3c2410_dma_chan *chan)
|
|
|
-{
|
|
|
- unsigned long tmp;
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- pr_debug("s3c2410_start_dma: channel=%d\n", chan->number);
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- if (chan->state == S3C2410_DMA_RUNNING) {
|
|
|
- pr_debug("s3c2410_start_dma: already running (%d)\n", chan->state);
|
|
|
- local_irq_restore(flags);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
- chan->state = S3C2410_DMA_RUNNING;
|
|
|
-
|
|
|
- /* check wether there is anything to load, and if not, see
|
|
|
- * if we can find anything to load
|
|
|
- */
|
|
|
-
|
|
|
- if (chan->load_state == S3C2410_DMALOAD_NONE) {
|
|
|
- if (chan->next == NULL) {
|
|
|
- printk(KERN_ERR "dma%d: channel has nothing loaded\n",
|
|
|
- chan->number);
|
|
|
- chan->state = S3C2410_DMA_IDLE;
|
|
|
- local_irq_restore(flags);
|
|
|
- return -EINVAL;
|
|
|
- }
|
|
|
-
|
|
|
- s3c2410_dma_loadbuffer(chan, chan->next);
|
|
|
- }
|
|
|
-
|
|
|
- dbg_showchan(chan);
|
|
|
-
|
|
|
- /* enable the channel */
|
|
|
-
|
|
|
- if (!chan->irq_enabled) {
|
|
|
- enable_irq(chan->irq);
|
|
|
- chan->irq_enabled = 1;
|
|
|
- }
|
|
|
-
|
|
|
- /* start the channel going */
|
|
|
-
|
|
|
- tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
|
|
|
- tmp &= ~S3C2410_DMASKTRIG_STOP;
|
|
|
- tmp |= S3C2410_DMASKTRIG_ON;
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp);
|
|
|
-
|
|
|
- pr_debug("dma%d: %08lx to DMASKTRIG\n", chan->number, tmp);
|
|
|
-
|
|
|
-#if 0
|
|
|
- /* the dma buffer loads should take care of clearing the AUTO
|
|
|
- * reloading feature */
|
|
|
- tmp = dma_rdreg(chan, S3C2410_DMA_DCON);
|
|
|
- tmp &= ~S3C2410_DCON_NORELOAD;
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
|
|
|
-#endif
|
|
|
-
|
|
|
- s3c2410_dma_call_op(chan, S3C2410_DMAOP_START);
|
|
|
-
|
|
|
- dbg_showchan(chan);
|
|
|
-
|
|
|
- /* if we've only loaded one buffer onto the channel, then chec
|
|
|
- * to see if we have another, and if so, try and load it so when
|
|
|
- * the first buffer is finished, the new one will be loaded onto
|
|
|
- * the channel */
|
|
|
-
|
|
|
- if (chan->next != NULL) {
|
|
|
- if (chan->load_state == S3C2410_DMALOAD_1LOADED) {
|
|
|
-
|
|
|
- if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
|
|
|
- pr_debug("%s: buff not yet loaded, no more todo\n",
|
|
|
- __FUNCTION__);
|
|
|
- } else {
|
|
|
- chan->load_state = S3C2410_DMALOAD_1RUNNING;
|
|
|
- s3c2410_dma_loadbuffer(chan, chan->next);
|
|
|
- }
|
|
|
-
|
|
|
- } else if (chan->load_state == S3C2410_DMALOAD_1RUNNING) {
|
|
|
- s3c2410_dma_loadbuffer(chan, chan->next);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- local_irq_restore(flags);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* s3c2410_dma_canload
|
|
|
- *
|
|
|
- * work out if we can queue another buffer into the DMA engine
|
|
|
-*/
|
|
|
-
|
|
|
-static int
|
|
|
-s3c2410_dma_canload(struct s3c2410_dma_chan *chan)
|
|
|
-{
|
|
|
- if (chan->load_state == S3C2410_DMALOAD_NONE ||
|
|
|
- chan->load_state == S3C2410_DMALOAD_1RUNNING)
|
|
|
- return 1;
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/* s3c2410_dma_enqueue
|
|
|
- *
|
|
|
- * queue an given buffer for dma transfer.
|
|
|
- *
|
|
|
- * id the device driver's id information for this buffer
|
|
|
- * data the physical address of the buffer data
|
|
|
- * size the size of the buffer in bytes
|
|
|
- *
|
|
|
- * If the channel is not running, then the flag S3C2410_DMAF_AUTOSTART
|
|
|
- * is checked, and if set, the channel is started. If this flag isn't set,
|
|
|
- * then an error will be returned.
|
|
|
- *
|
|
|
- * It is possible to queue more than one DMA buffer onto a channel at
|
|
|
- * once, and the code will deal with the re-loading of the next buffer
|
|
|
- * when necessary.
|
|
|
-*/
|
|
|
-
|
|
|
-int s3c2410_dma_enqueue(unsigned int channel, void *id,
|
|
|
- dma_addr_t data, int size)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
- struct s3c2410_dma_buf *buf;
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- pr_debug("%s: id=%p, data=%08x, size=%d\n",
|
|
|
- __FUNCTION__, id, (unsigned int)data, size);
|
|
|
-
|
|
|
- buf = kmem_cache_alloc(dma_kmem, GFP_ATOMIC);
|
|
|
- if (buf == NULL) {
|
|
|
- pr_debug("%s: out of memory (%ld alloc)\n",
|
|
|
- __FUNCTION__, (long)sizeof(*buf));
|
|
|
- return -ENOMEM;
|
|
|
- }
|
|
|
-
|
|
|
- //pr_debug("%s: new buffer %p\n", __FUNCTION__, buf);
|
|
|
- //dbg_showchan(chan);
|
|
|
-
|
|
|
- buf->next = NULL;
|
|
|
- buf->data = buf->ptr = data;
|
|
|
- buf->size = size;
|
|
|
- buf->id = id;
|
|
|
- buf->magic = BUF_MAGIC;
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- if (chan->curr == NULL) {
|
|
|
- /* we've got nothing loaded... */
|
|
|
- pr_debug("%s: buffer %p queued onto empty channel\n",
|
|
|
- __FUNCTION__, buf);
|
|
|
-
|
|
|
- chan->curr = buf;
|
|
|
- chan->end = buf;
|
|
|
- chan->next = NULL;
|
|
|
- } else {
|
|
|
- pr_debug("dma%d: %s: buffer %p queued onto non-empty channel\n",
|
|
|
- chan->number, __FUNCTION__, buf);
|
|
|
-
|
|
|
- if (chan->end == NULL)
|
|
|
- pr_debug("dma%d: %s: %p not empty, and chan->end==NULL?\n",
|
|
|
- chan->number, __FUNCTION__, chan);
|
|
|
-
|
|
|
- chan->end->next = buf;
|
|
|
- chan->end = buf;
|
|
|
- }
|
|
|
-
|
|
|
- /* if necessary, update the next buffer field */
|
|
|
- if (chan->next == NULL)
|
|
|
- chan->next = buf;
|
|
|
-
|
|
|
- /* check to see if we can load a buffer */
|
|
|
- if (chan->state == S3C2410_DMA_RUNNING) {
|
|
|
- if (chan->load_state == S3C2410_DMALOAD_1LOADED && 1) {
|
|
|
- if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
|
|
|
- printk(KERN_ERR "dma%d: loadbuffer:"
|
|
|
- "timeout loading buffer\n",
|
|
|
- chan->number);
|
|
|
- dbg_showchan(chan);
|
|
|
- local_irq_restore(flags);
|
|
|
- return -EINVAL;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- while (s3c2410_dma_canload(chan) && chan->next != NULL) {
|
|
|
- s3c2410_dma_loadbuffer(chan, chan->next);
|
|
|
- }
|
|
|
- } else if (chan->state == S3C2410_DMA_IDLE) {
|
|
|
- if (chan->flags & S3C2410_DMAF_AUTOSTART) {
|
|
|
- s3c2410_dma_ctrl(chan->number, S3C2410_DMAOP_START);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- local_irq_restore(flags);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_enqueue);
|
|
|
-
|
|
|
-static inline void
|
|
|
-s3c2410_dma_freebuf(struct s3c2410_dma_buf *buf)
|
|
|
-{
|
|
|
- int magicok = (buf->magic == BUF_MAGIC);
|
|
|
-
|
|
|
- buf->magic = -1;
|
|
|
-
|
|
|
- if (magicok) {
|
|
|
- kmem_cache_free(dma_kmem, buf);
|
|
|
- } else {
|
|
|
- printk("s3c2410_dma_freebuf: buff %p with bad magic\n", buf);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-/* s3c2410_dma_lastxfer
|
|
|
- *
|
|
|
- * called when the system is out of buffers, to ensure that the channel
|
|
|
- * is prepared for shutdown.
|
|
|
-*/
|
|
|
-
|
|
|
-static inline void
|
|
|
-s3c2410_dma_lastxfer(struct s3c2410_dma_chan *chan)
|
|
|
-{
|
|
|
-#if 0
|
|
|
- pr_debug("dma%d: s3c2410_dma_lastxfer: load_state %d\n",
|
|
|
- chan->number, chan->load_state);
|
|
|
-#endif
|
|
|
-
|
|
|
- switch (chan->load_state) {
|
|
|
- case S3C2410_DMALOAD_NONE:
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_1LOADED:
|
|
|
- if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
|
|
|
- /* flag error? */
|
|
|
- printk(KERN_ERR "dma%d: timeout waiting for load (%s)\n",
|
|
|
- chan->number, __FUNCTION__);
|
|
|
- return;
|
|
|
- }
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_1LOADED_1RUNNING:
|
|
|
- /* I belive in this case we do not have anything to do
|
|
|
- * until the next buffer comes along, and we turn off the
|
|
|
- * reload */
|
|
|
- return;
|
|
|
-
|
|
|
- default:
|
|
|
- pr_debug("dma%d: lastxfer: unhandled load_state %d with no next\n",
|
|
|
- chan->number, chan->load_state);
|
|
|
- return;
|
|
|
-
|
|
|
- }
|
|
|
-
|
|
|
- /* hopefully this'll shut the damned thing up after the transfer... */
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DCON, chan->dcon | S3C2410_DCON_NORELOAD);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-#define dmadbg2(x...)
|
|
|
-
|
|
|
-static irqreturn_t
|
|
|
-s3c2410_dma_irq(int irq, void *devpw)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = (struct s3c2410_dma_chan *)devpw;
|
|
|
- struct s3c2410_dma_buf *buf;
|
|
|
-
|
|
|
- buf = chan->curr;
|
|
|
-
|
|
|
- dbg_showchan(chan);
|
|
|
-
|
|
|
- /* modify the channel state */
|
|
|
-
|
|
|
- switch (chan->load_state) {
|
|
|
- case S3C2410_DMALOAD_1RUNNING:
|
|
|
- /* TODO - if we are running only one buffer, we probably
|
|
|
- * want to reload here, and then worry about the buffer
|
|
|
- * callback */
|
|
|
-
|
|
|
- chan->load_state = S3C2410_DMALOAD_NONE;
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_1LOADED:
|
|
|
- /* iirc, we should go back to NONE loaded here, we
|
|
|
- * had a buffer, and it was never verified as being
|
|
|
- * loaded.
|
|
|
- */
|
|
|
-
|
|
|
- chan->load_state = S3C2410_DMALOAD_NONE;
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_1LOADED_1RUNNING:
|
|
|
- /* we'll worry about checking to see if another buffer is
|
|
|
- * ready after we've called back the owner. This should
|
|
|
- * ensure we do not wait around too long for the DMA
|
|
|
- * engine to start the next transfer
|
|
|
- */
|
|
|
-
|
|
|
- chan->load_state = S3C2410_DMALOAD_1LOADED;
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_NONE:
|
|
|
- printk(KERN_ERR "dma%d: IRQ with no loaded buffer?\n",
|
|
|
- chan->number);
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- printk(KERN_ERR "dma%d: IRQ in invalid load_state %d\n",
|
|
|
- chan->number, chan->load_state);
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- if (buf != NULL) {
|
|
|
- /* update the chain to make sure that if we load any more
|
|
|
- * buffers when we call the callback function, things should
|
|
|
- * work properly */
|
|
|
-
|
|
|
- chan->curr = buf->next;
|
|
|
- buf->next = NULL;
|
|
|
-
|
|
|
- if (buf->magic != BUF_MAGIC) {
|
|
|
- printk(KERN_ERR "dma%d: %s: buf %p incorrect magic\n",
|
|
|
- chan->number, __FUNCTION__, buf);
|
|
|
- return IRQ_HANDLED;
|
|
|
- }
|
|
|
-
|
|
|
- s3c2410_dma_buffdone(chan, buf, S3C2410_RES_OK);
|
|
|
-
|
|
|
- /* free resouces */
|
|
|
- s3c2410_dma_freebuf(buf);
|
|
|
- } else {
|
|
|
- }
|
|
|
-
|
|
|
- /* only reload if the channel is still running... our buffer done
|
|
|
- * routine may have altered the state by requesting the dma channel
|
|
|
- * to stop or shutdown... */
|
|
|
-
|
|
|
- /* todo: check that when the channel is shut-down from inside this
|
|
|
- * function, we cope with unsetting reload, etc */
|
|
|
-
|
|
|
- if (chan->next != NULL && chan->state != S3C2410_DMA_IDLE) {
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- switch (chan->load_state) {
|
|
|
- case S3C2410_DMALOAD_1RUNNING:
|
|
|
- /* don't need to do anything for this state */
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_NONE:
|
|
|
- /* can load buffer immediately */
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_1LOADED:
|
|
|
- if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
|
|
|
- /* flag error? */
|
|
|
- printk(KERN_ERR "dma%d: timeout waiting for load (%s)\n",
|
|
|
- chan->number, __FUNCTION__);
|
|
|
- return IRQ_HANDLED;
|
|
|
- }
|
|
|
-
|
|
|
- break;
|
|
|
-
|
|
|
- case S3C2410_DMALOAD_1LOADED_1RUNNING:
|
|
|
- goto no_load;
|
|
|
-
|
|
|
- default:
|
|
|
- printk(KERN_ERR "dma%d: unknown load_state in irq, %d\n",
|
|
|
- chan->number, chan->load_state);
|
|
|
- return IRQ_HANDLED;
|
|
|
- }
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
- s3c2410_dma_loadbuffer(chan, chan->next);
|
|
|
- local_irq_restore(flags);
|
|
|
- } else {
|
|
|
- s3c2410_dma_lastxfer(chan);
|
|
|
-
|
|
|
- /* see if we can stop this channel.. */
|
|
|
- if (chan->load_state == S3C2410_DMALOAD_NONE) {
|
|
|
- pr_debug("dma%d: end of transfer, stopping channel (%ld)\n",
|
|
|
- chan->number, jiffies);
|
|
|
- s3c2410_dma_ctrl(chan->number | DMACH_LOW_LEVEL,
|
|
|
- S3C2410_DMAOP_STOP);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- no_load:
|
|
|
- return IRQ_HANDLED;
|
|
|
-}
|
|
|
-
|
|
|
-static struct s3c2410_dma_chan *s3c2410_dma_map_channel(int channel);
|
|
|
-
|
|
|
-/* s3c2410_request_dma
|
|
|
- *
|
|
|
- * get control of an dma channel
|
|
|
-*/
|
|
|
-
|
|
|
-int s3c2410_dma_request(unsigned int channel,
|
|
|
- struct s3c2410_dma_client *client,
|
|
|
- void *dev)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan;
|
|
|
- unsigned long flags;
|
|
|
- int err;
|
|
|
-
|
|
|
- pr_debug("dma%d: s3c2410_request_dma: client=%s, dev=%p\n",
|
|
|
- channel, client->name, dev);
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- chan = s3c2410_dma_map_channel(channel);
|
|
|
- if (chan == NULL) {
|
|
|
- local_irq_restore(flags);
|
|
|
- return -EBUSY;
|
|
|
- }
|
|
|
-
|
|
|
- dbg_showchan(chan);
|
|
|
-
|
|
|
- chan->client = client;
|
|
|
- chan->in_use = 1;
|
|
|
-
|
|
|
- if (!chan->irq_claimed) {
|
|
|
- pr_debug("dma%d: %s : requesting irq %d\n",
|
|
|
- channel, __FUNCTION__, chan->irq);
|
|
|
-
|
|
|
- chan->irq_claimed = 1;
|
|
|
- local_irq_restore(flags);
|
|
|
-
|
|
|
- err = request_irq(chan->irq, s3c2410_dma_irq, IRQF_DISABLED,
|
|
|
- client->name, (void *)chan);
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- if (err) {
|
|
|
- chan->in_use = 0;
|
|
|
- chan->irq_claimed = 0;
|
|
|
- local_irq_restore(flags);
|
|
|
-
|
|
|
- printk(KERN_ERR "%s: cannot get IRQ %d for DMA %d\n",
|
|
|
- client->name, chan->irq, chan->number);
|
|
|
- return err;
|
|
|
- }
|
|
|
-
|
|
|
- chan->irq_enabled = 1;
|
|
|
- }
|
|
|
-
|
|
|
- local_irq_restore(flags);
|
|
|
-
|
|
|
- /* need to setup */
|
|
|
-
|
|
|
- pr_debug("%s: channel initialised, %p\n", __FUNCTION__, chan);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_request);
|
|
|
+static struct s3c24xx_dma_selection __initdata s3c2410_dma_sel = {
|
|
|
+ .select = s3c2410_dma_select,
|
|
|
+ .dcon_mask = 7 << 24,
|
|
|
+ .map = s3c2410_dma_mappings,
|
|
|
+ .map_size = ARRAY_SIZE(s3c2410_dma_mappings),
|
|
|
+};
|
|
|
|
|
|
-/* s3c2410_dma_free
|
|
|
- *
|
|
|
- * release the given channel back to the system, will stop and flush
|
|
|
- * any outstanding transfers, and ensure the channel is ready for the
|
|
|
- * next claimant.
|
|
|
- *
|
|
|
- * Note, although a warning is currently printed if the freeing client
|
|
|
- * info is not the same as the registrant's client info, the free is still
|
|
|
- * allowed to go through.
|
|
|
-*/
|
|
|
+static struct s3c24xx_dma_order __initdata s3c2410_dma_order = {
|
|
|
+ .channels = {
|
|
|
+ [DMACH_SDI] = {
|
|
|
+ .list = {
|
|
|
+ [0] = 3 | DMA_CH_VALID,
|
|
|
+ [1] = 2 | DMA_CH_VALID,
|
|
|
+ [2] = 0 | DMA_CH_VALID,
|
|
|
+ },
|
|
|
+ },
|
|
|
+ [DMACH_I2S_IN] = {
|
|
|
+ .list = {
|
|
|
+ [0] = 1 | DMA_CH_VALID,
|
|
|
+ [1] = 2 | DMA_CH_VALID,
|
|
|
+ },
|
|
|
+ },
|
|
|
+ },
|
|
|
+};
|
|
|
|
|
|
-int s3c2410_dma_free(dmach_t channel, struct s3c2410_dma_client *client)
|
|
|
+static int s3c2410_dma_add(struct sys_device *sysdev)
|
|
|
{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- if (chan->client != client) {
|
|
|
- printk(KERN_WARNING "dma%d: possible free from different client (channel %p, passed %p)\n",
|
|
|
- channel, chan->client, client);
|
|
|
- }
|
|
|
-
|
|
|
- /* sort out stopping and freeing the channel */
|
|
|
-
|
|
|
- if (chan->state != S3C2410_DMA_IDLE) {
|
|
|
- pr_debug("%s: need to stop dma channel %p\n",
|
|
|
- __FUNCTION__, chan);
|
|
|
-
|
|
|
- /* possibly flush the channel */
|
|
|
- s3c2410_dma_ctrl(channel, S3C2410_DMAOP_STOP);
|
|
|
- }
|
|
|
-
|
|
|
- chan->client = NULL;
|
|
|
- chan->in_use = 0;
|
|
|
-
|
|
|
- if (chan->irq_claimed)
|
|
|
- free_irq(chan->irq, (void *)chan);
|
|
|
-
|
|
|
- chan->irq_claimed = 0;
|
|
|
-
|
|
|
- if (!(channel & DMACH_LOW_LEVEL))
|
|
|
- dma_chan_map[channel] = NULL;
|
|
|
-
|
|
|
- local_irq_restore(flags);
|
|
|
-
|
|
|
- return 0;
|
|
|
+ s3c2410_dma_init();
|
|
|
+ s3c24xx_dma_order_set(&s3c2410_dma_order);
|
|
|
+ return s3c24xx_dma_init_map(&s3c2410_dma_sel);
|
|
|
}
|
|
|
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_free);
|
|
|
-
|
|
|
-static int s3c2410_dma_dostop(struct s3c2410_dma_chan *chan)
|
|
|
-{
|
|
|
- unsigned long flags;
|
|
|
- unsigned long tmp;
|
|
|
-
|
|
|
- pr_debug("%s:\n", __FUNCTION__);
|
|
|
-
|
|
|
- dbg_showchan(chan);
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- s3c2410_dma_call_op(chan, S3C2410_DMAOP_STOP);
|
|
|
-
|
|
|
- tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
|
|
|
- tmp |= S3C2410_DMASKTRIG_STOP;
|
|
|
- //tmp &= ~S3C2410_DMASKTRIG_ON;
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DMASKTRIG, tmp);
|
|
|
-
|
|
|
-#if 0
|
|
|
- /* should also clear interrupts, according to WinCE BSP */
|
|
|
- tmp = dma_rdreg(chan, S3C2410_DMA_DCON);
|
|
|
- tmp |= S3C2410_DCON_NORELOAD;
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
|
|
|
-#endif
|
|
|
-
|
|
|
- /* should stop do this, or should we wait for flush? */
|
|
|
- chan->state = S3C2410_DMA_IDLE;
|
|
|
- chan->load_state = S3C2410_DMALOAD_NONE;
|
|
|
-
|
|
|
- local_irq_restore(flags);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
+#if defined(CONFIG_CPU_S3C2410)
|
|
|
+static struct sysdev_driver s3c2410_dma_driver = {
|
|
|
+ .add = s3c2410_dma_add,
|
|
|
+};
|
|
|
|
|
|
-void s3c2410_dma_waitforstop(struct s3c2410_dma_chan *chan)
|
|
|
+static int __init s3c2410_dma_drvinit(void)
|
|
|
{
|
|
|
- unsigned long tmp;
|
|
|
- unsigned int timeout = 0x10000;
|
|
|
-
|
|
|
- while (timeout-- > 0) {
|
|
|
- tmp = dma_rdreg(chan, S3C2410_DMA_DMASKTRIG);
|
|
|
-
|
|
|
- if (!(tmp & S3C2410_DMASKTRIG_ON))
|
|
|
- return;
|
|
|
- }
|
|
|
-
|
|
|
- pr_debug("dma%d: failed to stop?\n", chan->number);
|
|
|
+ return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_dma_driver);
|
|
|
}
|
|
|
|
|
|
-
|
|
|
-/* s3c2410_dma_flush
|
|
|
- *
|
|
|
- * stop the channel, and remove all current and pending transfers
|
|
|
-*/
|
|
|
-
|
|
|
-static int s3c2410_dma_flush(struct s3c2410_dma_chan *chan)
|
|
|
-{
|
|
|
- struct s3c2410_dma_buf *buf, *next;
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- pr_debug("%s: chan %p (%d)\n", __FUNCTION__, chan, chan->number);
|
|
|
-
|
|
|
- dbg_showchan(chan);
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- if (chan->state != S3C2410_DMA_IDLE) {
|
|
|
- pr_debug("%s: stopping channel...\n", __FUNCTION__ );
|
|
|
- s3c2410_dma_ctrl(chan->number, S3C2410_DMAOP_STOP);
|
|
|
- }
|
|
|
-
|
|
|
- buf = chan->curr;
|
|
|
- if (buf == NULL)
|
|
|
- buf = chan->next;
|
|
|
-
|
|
|
- chan->curr = chan->next = chan->end = NULL;
|
|
|
-
|
|
|
- if (buf != NULL) {
|
|
|
- for ( ; buf != NULL; buf = next) {
|
|
|
- next = buf->next;
|
|
|
-
|
|
|
- pr_debug("%s: free buffer %p, next %p\n",
|
|
|
- __FUNCTION__, buf, buf->next);
|
|
|
-
|
|
|
- s3c2410_dma_buffdone(chan, buf, S3C2410_RES_ABORT);
|
|
|
- s3c2410_dma_freebuf(buf);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- dbg_showregs(chan);
|
|
|
-
|
|
|
- s3c2410_dma_waitforstop(chan);
|
|
|
-
|
|
|
-#if 0
|
|
|
- /* should also clear interrupts, according to WinCE BSP */
|
|
|
- {
|
|
|
- unsigned long tmp;
|
|
|
-
|
|
|
- tmp = dma_rdreg(chan, S3C2410_DMA_DCON);
|
|
|
- tmp |= S3C2410_DCON_NORELOAD;
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DCON, tmp);
|
|
|
- }
|
|
|
+arch_initcall(s3c2410_dma_drvinit);
|
|
|
#endif
|
|
|
|
|
|
- dbg_showregs(chan);
|
|
|
-
|
|
|
- local_irq_restore(flags);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-int
|
|
|
-s3c2410_dma_started(struct s3c2410_dma_chan *chan)
|
|
|
-{
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- local_irq_save(flags);
|
|
|
-
|
|
|
- dbg_showchan(chan);
|
|
|
-
|
|
|
- /* if we've only loaded one buffer onto the channel, then chec
|
|
|
- * to see if we have another, and if so, try and load it so when
|
|
|
- * the first buffer is finished, the new one will be loaded onto
|
|
|
- * the channel */
|
|
|
-
|
|
|
- if (chan->next != NULL) {
|
|
|
- if (chan->load_state == S3C2410_DMALOAD_1LOADED) {
|
|
|
-
|
|
|
- if (s3c2410_dma_waitforload(chan, __LINE__) == 0) {
|
|
|
- pr_debug("%s: buff not yet loaded, no more todo\n",
|
|
|
- __FUNCTION__);
|
|
|
- } else {
|
|
|
- chan->load_state = S3C2410_DMALOAD_1RUNNING;
|
|
|
- s3c2410_dma_loadbuffer(chan, chan->next);
|
|
|
- }
|
|
|
-
|
|
|
- } else if (chan->load_state == S3C2410_DMALOAD_1RUNNING) {
|
|
|
- s3c2410_dma_loadbuffer(chan, chan->next);
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
-
|
|
|
- local_irq_restore(flags);
|
|
|
-
|
|
|
- return 0;
|
|
|
-
|
|
|
-}
|
|
|
-
|
|
|
-int
|
|
|
-s3c2410_dma_ctrl(dmach_t channel, enum s3c2410_chan_op op)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- switch (op) {
|
|
|
- case S3C2410_DMAOP_START:
|
|
|
- return s3c2410_dma_start(chan);
|
|
|
-
|
|
|
- case S3C2410_DMAOP_STOP:
|
|
|
- return s3c2410_dma_dostop(chan);
|
|
|
-
|
|
|
- case S3C2410_DMAOP_PAUSE:
|
|
|
- case S3C2410_DMAOP_RESUME:
|
|
|
- return -ENOENT;
|
|
|
-
|
|
|
- case S3C2410_DMAOP_FLUSH:
|
|
|
- return s3c2410_dma_flush(chan);
|
|
|
-
|
|
|
- case S3C2410_DMAOP_STARTED:
|
|
|
- return s3c2410_dma_started(chan);
|
|
|
-
|
|
|
- case S3C2410_DMAOP_TIMEOUT:
|
|
|
- return 0;
|
|
|
-
|
|
|
- }
|
|
|
-
|
|
|
- return -ENOENT; /* unknown, don't bother */
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_ctrl);
|
|
|
-
|
|
|
-/* DMA configuration for each channel
|
|
|
- *
|
|
|
- * DISRCC -> source of the DMA (AHB,APB)
|
|
|
- * DISRC -> source address of the DMA
|
|
|
- * DIDSTC -> destination of the DMA (AHB,APD)
|
|
|
- * DIDST -> destination address of the DMA
|
|
|
-*/
|
|
|
-
|
|
|
-/* s3c2410_dma_config
|
|
|
- *
|
|
|
- * xfersize: size of unit in bytes (1,2,4)
|
|
|
- * dcon: base value of the DCONx register
|
|
|
-*/
|
|
|
-
|
|
|
-int s3c2410_dma_config(dmach_t channel,
|
|
|
- int xferunit,
|
|
|
- int dcon)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
-
|
|
|
- pr_debug("%s: chan=%d, xfer_unit=%d, dcon=%08x\n",
|
|
|
- __FUNCTION__, channel, xferunit, dcon);
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- pr_debug("%s: Initial dcon is %08x\n", __FUNCTION__, dcon);
|
|
|
-
|
|
|
- dcon |= chan->dcon & dma_sel.dcon_mask;
|
|
|
-
|
|
|
- pr_debug("%s: New dcon is %08x\n", __FUNCTION__, dcon);
|
|
|
-
|
|
|
- switch (xferunit) {
|
|
|
- case 1:
|
|
|
- dcon |= S3C2410_DCON_BYTE;
|
|
|
- break;
|
|
|
-
|
|
|
- case 2:
|
|
|
- dcon |= S3C2410_DCON_HALFWORD;
|
|
|
- break;
|
|
|
-
|
|
|
- case 4:
|
|
|
- dcon |= S3C2410_DCON_WORD;
|
|
|
- break;
|
|
|
-
|
|
|
- default:
|
|
|
- pr_debug("%s: bad transfer size %d\n", __FUNCTION__, xferunit);
|
|
|
- return -EINVAL;
|
|
|
- }
|
|
|
-
|
|
|
- dcon |= S3C2410_DCON_HWTRIG;
|
|
|
- dcon |= S3C2410_DCON_INTREQ;
|
|
|
-
|
|
|
- pr_debug("%s: dcon now %08x\n", __FUNCTION__, dcon);
|
|
|
-
|
|
|
- chan->dcon = dcon;
|
|
|
- chan->xfer_unit = xferunit;
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_config);
|
|
|
-
|
|
|
-int s3c2410_dma_setflags(dmach_t channel, unsigned int flags)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- pr_debug("%s: chan=%p, flags=%08x\n", __FUNCTION__, chan, flags);
|
|
|
-
|
|
|
- chan->flags = flags;
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_setflags);
|
|
|
-
|
|
|
-
|
|
|
-/* do we need to protect the settings of the fields from
|
|
|
- * irq?
|
|
|
-*/
|
|
|
-
|
|
|
-int s3c2410_dma_set_opfn(dmach_t channel, s3c2410_dma_opfn_t rtn)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- pr_debug("%s: chan=%p, op rtn=%p\n", __FUNCTION__, chan, rtn);
|
|
|
-
|
|
|
- chan->op_fn = rtn;
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_set_opfn);
|
|
|
-
|
|
|
-int s3c2410_dma_set_buffdone_fn(dmach_t channel, s3c2410_dma_cbfn_t rtn)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- pr_debug("%s: chan=%p, callback rtn=%p\n", __FUNCTION__, chan, rtn);
|
|
|
-
|
|
|
- chan->callback_fn = rtn;
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_set_buffdone_fn);
|
|
|
-
|
|
|
-/* s3c2410_dma_devconfig
|
|
|
- *
|
|
|
- * configure the dma source/destination hardware type and address
|
|
|
- *
|
|
|
- * source: S3C2410_DMASRC_HW: source is hardware
|
|
|
- * S3C2410_DMASRC_MEM: source is memory
|
|
|
- *
|
|
|
- * hwcfg: the value for xxxSTCn register,
|
|
|
- * bit 0: 0=increment pointer, 1=leave pointer
|
|
|
- * bit 1: 0=soucre is AHB, 1=soucre is APB
|
|
|
- *
|
|
|
- * devaddr: physical address of the source
|
|
|
-*/
|
|
|
-
|
|
|
-int s3c2410_dma_devconfig(int channel,
|
|
|
- enum s3c2410_dmasrc source,
|
|
|
- int hwcfg,
|
|
|
- unsigned long devaddr)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- pr_debug("%s: source=%d, hwcfg=%08x, devaddr=%08lx\n",
|
|
|
- __FUNCTION__, (int)source, hwcfg, devaddr);
|
|
|
-
|
|
|
- chan->source = source;
|
|
|
- chan->dev_addr = devaddr;
|
|
|
-
|
|
|
- switch (source) {
|
|
|
- case S3C2410_DMASRC_HW:
|
|
|
- /* source is hardware */
|
|
|
- pr_debug("%s: hw source, devaddr=%08lx, hwcfg=%d\n",
|
|
|
- __FUNCTION__, devaddr, hwcfg);
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DISRCC, hwcfg & 3);
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DISRC, devaddr);
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DIDSTC, (0<<1) | (0<<0));
|
|
|
-
|
|
|
- chan->addr_reg = dma_regaddr(chan, S3C2410_DMA_DIDST);
|
|
|
- return 0;
|
|
|
-
|
|
|
- case S3C2410_DMASRC_MEM:
|
|
|
- /* source is memory */
|
|
|
- pr_debug( "%s: mem source, devaddr=%08lx, hwcfg=%d\n",
|
|
|
- __FUNCTION__, devaddr, hwcfg);
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DISRCC, (0<<1) | (0<<0));
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DIDST, devaddr);
|
|
|
- dma_wrreg(chan, S3C2410_DMA_DIDSTC, hwcfg & 3);
|
|
|
-
|
|
|
- chan->addr_reg = dma_regaddr(chan, S3C2410_DMA_DISRC);
|
|
|
- return 0;
|
|
|
- }
|
|
|
-
|
|
|
- printk(KERN_ERR "dma%d: invalid source type (%d)\n", channel, source);
|
|
|
- return -EINVAL;
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_devconfig);
|
|
|
-
|
|
|
-/* s3c2410_dma_getposition
|
|
|
- *
|
|
|
- * returns the current transfer points for the dma source and destination
|
|
|
-*/
|
|
|
-
|
|
|
-int s3c2410_dma_getposition(dmach_t channel, dma_addr_t *src, dma_addr_t *dst)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *chan = lookup_dma_channel(channel);
|
|
|
-
|
|
|
- if (chan == NULL)
|
|
|
- return -EINVAL;
|
|
|
-
|
|
|
- if (src != NULL)
|
|
|
- *src = dma_rdreg(chan, S3C2410_DMA_DCSRC);
|
|
|
-
|
|
|
- if (dst != NULL)
|
|
|
- *dst = dma_rdreg(chan, S3C2410_DMA_DCDST);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-EXPORT_SYMBOL(s3c2410_dma_getposition);
|
|
|
-
|
|
|
-
|
|
|
-/* system device class */
|
|
|
-
|
|
|
-#ifdef CONFIG_PM
|
|
|
-
|
|
|
-static int s3c2410_dma_suspend(struct sys_device *dev, pm_message_t state)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *cp = container_of(dev, struct s3c2410_dma_chan, dev);
|
|
|
-
|
|
|
- printk(KERN_DEBUG "suspending dma channel %d\n", cp->number);
|
|
|
-
|
|
|
- if (dma_rdreg(cp, S3C2410_DMA_DMASKTRIG) & S3C2410_DMASKTRIG_ON) {
|
|
|
- /* the dma channel is still working, which is probably
|
|
|
- * a bad thing to do over suspend/resume. We stop the
|
|
|
- * channel and assume that the client is either going to
|
|
|
- * retry after resume, or that it is broken.
|
|
|
- */
|
|
|
-
|
|
|
- printk(KERN_INFO "dma: stopping channel %d due to suspend\n",
|
|
|
- cp->number);
|
|
|
-
|
|
|
- s3c2410_dma_dostop(cp);
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static int s3c2410_dma_resume(struct sys_device *dev)
|
|
|
-{
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-#else
|
|
|
-#define s3c2410_dma_suspend NULL
|
|
|
-#define s3c2410_dma_resume NULL
|
|
|
-#endif /* CONFIG_PM */
|
|
|
-
|
|
|
-struct sysdev_class dma_sysclass = {
|
|
|
- set_kset_name("s3c24xx-dma"),
|
|
|
- .suspend = s3c2410_dma_suspend,
|
|
|
- .resume = s3c2410_dma_resume,
|
|
|
+#if defined(CONFIG_CPU_S3C2442)
|
|
|
+/* S3C2442 DMA contains the same selection table as the S3C2410 */
|
|
|
+static struct sysdev_driver s3c2442_dma_driver = {
|
|
|
+ .add = s3c2410_dma_add,
|
|
|
};
|
|
|
|
|
|
-/* kmem cache implementation */
|
|
|
-
|
|
|
-static void s3c2410_dma_cache_ctor(void *p, struct kmem_cache *c, unsigned long f)
|
|
|
-{
|
|
|
- memset(p, 0, sizeof(struct s3c2410_dma_buf));
|
|
|
-}
|
|
|
-
|
|
|
-/* initialisation code */
|
|
|
-
|
|
|
-static int __init s3c2410_init_dma(void)
|
|
|
-{
|
|
|
- struct s3c2410_dma_chan *cp;
|
|
|
- int channel;
|
|
|
- int ret;
|
|
|
-
|
|
|
- printk("S3C24XX DMA Driver, (c) 2003-2004,2006 Simtec Electronics\n");
|
|
|
-
|
|
|
- dma_base = ioremap(S3C24XX_PA_DMA, 0x200);
|
|
|
- if (dma_base == NULL) {
|
|
|
- printk(KERN_ERR "dma failed to remap register block\n");
|
|
|
- return -ENOMEM;
|
|
|
- }
|
|
|
-
|
|
|
- printk("Registering sysclass\n");
|
|
|
-
|
|
|
- ret = sysdev_class_register(&dma_sysclass);
|
|
|
- if (ret != 0) {
|
|
|
- printk(KERN_ERR "dma sysclass registration failed\n");
|
|
|
- goto err;
|
|
|
- }
|
|
|
-
|
|
|
- dma_kmem = kmem_cache_create("dma_desc", sizeof(struct s3c2410_dma_buf), 0,
|
|
|
- SLAB_HWCACHE_ALIGN,
|
|
|
- s3c2410_dma_cache_ctor, NULL);
|
|
|
-
|
|
|
- if (dma_kmem == NULL) {
|
|
|
- printk(KERN_ERR "dma failed to make kmem cache\n");
|
|
|
- ret = -ENOMEM;
|
|
|
- goto err;
|
|
|
- }
|
|
|
-
|
|
|
- for (channel = 0; channel < S3C2410_DMA_CHANNELS; channel++) {
|
|
|
- cp = &s3c2410_chans[channel];
|
|
|
-
|
|
|
- memset(cp, 0, sizeof(struct s3c2410_dma_chan));
|
|
|
-
|
|
|
- /* dma channel irqs are in order.. */
|
|
|
- cp->number = channel;
|
|
|
- cp->irq = channel + IRQ_DMA0;
|
|
|
- cp->regs = dma_base + (channel*0x40);
|
|
|
-
|
|
|
- /* point current stats somewhere */
|
|
|
- cp->stats = &cp->stats_store;
|
|
|
- cp->stats_store.timeout_shortest = LONG_MAX;
|
|
|
-
|
|
|
- /* basic channel configuration */
|
|
|
-
|
|
|
- cp->load_timeout = 1<<18;
|
|
|
-
|
|
|
- /* register system device */
|
|
|
-
|
|
|
- cp->dev.cls = &dma_sysclass;
|
|
|
- cp->dev.id = channel;
|
|
|
- ret = sysdev_register(&cp->dev);
|
|
|
-
|
|
|
- printk("DMA channel %d at %p, irq %d\n",
|
|
|
- cp->number, cp->regs, cp->irq);
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-
|
|
|
- err:
|
|
|
- kmem_cache_destroy(dma_kmem);
|
|
|
- iounmap(dma_base);
|
|
|
- dma_base = NULL;
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-core_initcall(s3c2410_init_dma);
|
|
|
-
|
|
|
-static inline int is_channel_valid(unsigned int channel)
|
|
|
+static int __init s3c2442_dma_drvinit(void)
|
|
|
{
|
|
|
- return (channel & DMA_CH_VALID);
|
|
|
+ return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_dma_driver);
|
|
|
}
|
|
|
|
|
|
-/* s3c2410_dma_map_channel()
|
|
|
- *
|
|
|
- * turn the virtual channel number into a real, and un-used hardware
|
|
|
- * channel.
|
|
|
- *
|
|
|
- * currently this code uses first-free channel from the specified harware
|
|
|
- * map, not taking into account anything that the board setup code may
|
|
|
- * have to say about the likely peripheral set to be in use.
|
|
|
-*/
|
|
|
-
|
|
|
-struct s3c2410_dma_chan *s3c2410_dma_map_channel(int channel)
|
|
|
-{
|
|
|
- struct s3c24xx_dma_map *ch_map;
|
|
|
- struct s3c2410_dma_chan *dmach;
|
|
|
- int ch;
|
|
|
-
|
|
|
- if (dma_sel.map == NULL || channel > dma_sel.map_size)
|
|
|
- return NULL;
|
|
|
-
|
|
|
- ch_map = dma_sel.map + channel;
|
|
|
-
|
|
|
- for (ch = 0; ch < S3C2410_DMA_CHANNELS; ch++) {
|
|
|
- if (!is_channel_valid(ch_map->channels[ch]))
|
|
|
- continue;
|
|
|
-
|
|
|
- if (s3c2410_chans[ch].in_use == 0) {
|
|
|
- printk("mapped channel %d to %d\n", channel, ch);
|
|
|
- break;
|
|
|
- }
|
|
|
- }
|
|
|
-
|
|
|
- if (ch >= S3C2410_DMA_CHANNELS)
|
|
|
- return NULL;
|
|
|
-
|
|
|
- /* update our channel mapping */
|
|
|
-
|
|
|
- dmach = &s3c2410_chans[ch];
|
|
|
- dma_chan_map[channel] = dmach;
|
|
|
-
|
|
|
- /* select the channel */
|
|
|
-
|
|
|
- (dma_sel.select)(dmach, ch_map);
|
|
|
-
|
|
|
- return dmach;
|
|
|
-}
|
|
|
-
|
|
|
-static void s3c24xx_dma_show_ch(struct s3c24xx_dma_map *map, int ch)
|
|
|
-{
|
|
|
- /* show the channel configuration */
|
|
|
-
|
|
|
- printk("%2d: %20s, channels %c%c%c%c\n", ch, map->name,
|
|
|
- (is_channel_valid(map->channels[0]) ? '0' : '-'),
|
|
|
- (is_channel_valid(map->channels[1]) ? '1' : '-'),
|
|
|
- (is_channel_valid(map->channels[2]) ? '2' : '-'),
|
|
|
- (is_channel_valid(map->channels[3]) ? '3' : '-'));
|
|
|
-}
|
|
|
-
|
|
|
-static int s3c24xx_dma_check_entry(struct s3c24xx_dma_map *map, int ch)
|
|
|
-{
|
|
|
- if (1)
|
|
|
- s3c24xx_dma_show_ch(map, ch);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-int __init s3c24xx_dma_init_map(struct s3c24xx_dma_selection *sel)
|
|
|
-{
|
|
|
- struct s3c24xx_dma_map *nmap;
|
|
|
- size_t map_sz = sizeof(*nmap) * sel->map_size;
|
|
|
- int ptr;
|
|
|
-
|
|
|
- nmap = kmalloc(map_sz, GFP_KERNEL);
|
|
|
- if (nmap == NULL)
|
|
|
- return -ENOMEM;
|
|
|
-
|
|
|
- memcpy(nmap, sel->map, map_sz);
|
|
|
- memcpy(&dma_sel, sel, sizeof(*sel));
|
|
|
-
|
|
|
- dma_sel.map = nmap;
|
|
|
-
|
|
|
- for (ptr = 0; ptr < sel->map_size; ptr++)
|
|
|
- s3c24xx_dma_check_entry(nmap+ptr, ptr);
|
|
|
+arch_initcall(s3c2442_dma_drvinit);
|
|
|
+#endif
|
|
|
|
|
|
- return 0;
|
|
|
-}
|