8xxx: Break out DMA code to a common file

DMA support is now enabled via the CONFIG_FSL_DMA define instead of the
previous CONFIG_DDR_ECC

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

cpu/mpc85xx/cpu.c

@@ -264,53 +264,6 @@ reset_85xx_watchdog(void)
 }
 #endif	/* CONFIG_WATCHDOG */
 
-#if defined(CONFIG_DDR_ECC)
-void dma_init(void) {
-	volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR);
-	volatile fsl_dma_t *dma = &dma_base->dma[0];
-
-	dma->satr = 0x00040000;
-	dma->datr = 0x00040000;
-	dma->sr = 0xffffffff; /* clear any errors */
-	asm("sync; isync; msync");
-	return;
-}
-
-uint dma_check(void) {
-	volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR);
-	volatile fsl_dma_t *dma = &dma_base->dma[0];
-	volatile uint status = dma->sr;
-
-	/* While the channel is busy, spin */
-	while((status & 4) == 4) {
-		status = dma->sr;
-	}
-
-	/* clear MR[CS] channel start bit */
-	dma->mr &= 0x00000001;
-	asm("sync;isync;msync");
-
-	if (status != 0) {
-		printf ("DMA Error: status = %x\n", status);
-	}
-	return status;
-}
-
-int dma_xfer(void *dest, uint count, void *src) {
-	volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR);
-	volatile fsl_dma_t *dma = &dma_base->dma[0];
-
-	dma->dar = (uint) dest;
-	dma->sar = (uint) src;
-	dma->bcr = count;
-	dma->mr = 0xf000004;
-	asm("sync;isync;msync");
-	dma->mr = 0xf000005;
-	asm("sync;isync;msync");
-	return dma_check();
-}
-#endif
-
 /*
  * Configures a UPM. The function requires the respective MxMR to be set
  * before calling this function. "size" is the number or entries, not a sizeof.

cpu/mpc86xx/cpu.c

@@ -186,61 +186,6 @@ watchdog_reset(void)
 }
 #endif	/* CONFIG_WATCHDOG */
 
-
-#if defined(CONFIG_DDR_ECC)
-void
-dma_init(void)
-{
-	volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC86xx_DMA_ADDR);
-	volatile fsl_dma_t *dma = &dma_base->dma[0];
-
-	dma->satr = 0x00040000;
-	dma->datr = 0x00040000;
-	dma->sr = 0xffffffff; /* clear any errors */
-	asm("sync; isync");
-}
-
-uint
-dma_check(void)
-{
-	volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC86xx_DMA_ADDR);
-	volatile fsl_dma_t *dma = &dma_base->dma[0];
-	volatile uint status = dma->sr;
-
-	/* While the channel is busy, spin */
-	while ((status & 4) == 4) {
-		status = dma->sr;
-	}
-
-	/* clear MR[CS] channel start bit */
-	dma->mr &= 0x00000001;
-	asm("sync;isync");
-
-	if (status != 0) {
-		printf("DMA Error: status = %x\n", status);
-	}
-	return status;
-}
-
-int
-dma_xfer(void *dest, uint count, void *src)
-{
-	volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC86xx_DMA_ADDR);
-	volatile fsl_dma_t *dma = &dma_base->dma[0];
-
-	dma->dar = (uint) dest;
-	dma->sar = (uint) src;
-	dma->bcr = count;
-	dma->mr = 0xf000004;
-	asm("sync;isync");
-	dma->mr = 0xf000005;
-	asm("sync;isync");
-	return dma_check();
-}
-
-#endif	/* CONFIG_DDR_ECC */
-
-
 /*
  * Print out the state of various machine registers.
  * Currently prints out LAWs, BR0/OR0, and BATs

drivers/dma/Makefile

@@ -26,6 +26,7 @@ include $(TOPDIR)/config.mk
 LIB	:= $(obj)libdma.a
 
 COBJS-$(CONFIG_FSLDMAFEC) += MCD_tasksInit.o MCD_dmaApi.o MCD_tasks.o
+COBJS-$(CONFIG_FSL_DMA) += fsl_dma.o
 
 COBJS	:= $(COBJS-y)
 SRCS	:= $(COBJS:.o=.c)

drivers/dma/fsl_dma.c

@@ -0,0 +1,92 @@
+/*
+ * Copyright 2004,2007,2008 Freescale Semiconductor, Inc.
+ * (C) Copyright 2002, 2003 Motorola Inc.
+ * Xianghua Xiao (X.Xiao@motorola.com)
+ *
+ * (C) Copyright 2000
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#include <config.h>
+#include <common.h>
+#include <asm/fsl_dma.h>
+
+#if defined(CONFIG_MPC85xx)
+volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC85xx_DMA_ADDR);
+#elif defined(CONFIG_MPC86xx)
+volatile ccsr_dma_t *dma_base = (void *)(CONFIG_SYS_MPC86xx_DMA_ADDR);
+#else
+#error "Freescale DMA engine not supported on your processor"
+#endif
+
+static void dma_sync(void)
+{
+#if defined(CONFIG_MPC85xx)
+	asm("sync; isync; msync");
+#elif defined(CONFIG_MPC86xx)
+	asm("sync; isync");
+#endif
+}
+
+static uint dma_check(void) {
+	volatile fsl_dma_t *dma = &dma_base->dma[0];
+	volatile uint status = dma->sr;
+
+	/* While the channel is busy, spin */
+	while (status & 4)
+		status = dma->sr;
+
+	/* clear MR[CS] channel start bit */
+	dma->mr &= 1;
+	dma_sync();
+
+	if (status != 0)
+		printf ("DMA Error: status = %x\n", status);
+
+	return status;
+}
+
+void dma_init(void) {
+	volatile fsl_dma_t *dma = &dma_base->dma[0];
+
+	dma->satr = 0x00040000;
+	dma->datr = 0x00040000;
+	dma->sr = 0xffffffff; /* clear any errors */
+	dma_sync();
+}
+
+int dma_xfer(void *dest, uint count, void *src) {
+	volatile fsl_dma_t *dma = &dma_base->dma[0];
+
+	dma->dar = (uint) dest;
+	dma->sar = (uint) src;
+	dma->bcr = count;
+
+	/* Disable bandwidth control, use direct transfer mode */
+	dma->mr = 0xf000004;
+	dma_sync();
+
+	/* Start the transfer */
+	dma->mr = 0xf000005;
+	dma_sync();
+
+	return dma_check();
+}

include/asm-ppc/config.h

@@ -29,4 +29,11 @@
 #endif
 #endif
 
+#ifndef CONFIG_FSL_DMA
+#if defined(CONFIG_DDR_ECC) && !defined(CONFIG_ECC_INIT_VIA_DDRCONTROLLER) && \
+	(defined(CONFIG_MPC85xx) || defined(CONFIG_MPC86xx))
+#define CONFIG_FSL_DMA
 #endif
+#endif
+
+#endif /* _ASM_CONFIG_H_ */

include/configs/PM854.h

@@ -96,6 +96,7 @@
 #undef CONFIG_DDR_SPD
 #define CONFIG_DDR_DLL                      /* possible DLL fix needed */
 #define CONFIG_DDR_ECC			    /* only for ECC DDR module */
+#define CONFIG_FSL_DMA			    /* use DMA to init DDR ECC  */
 
 #define CONFIG_MEM_INIT_VALUE	0xDeadBeef
 

include/configs/PM856.h

@@ -98,6 +98,7 @@
 #undef CONFIG_DDR_SPD
 #define CONFIG_DDR_DLL                      /* possible DLL fix needed */
 #define CONFIG_DDR_ECC			    /* only for ECC DDR module */
+#define CONFIG_FSL_DMA			    /* use DMA to init DDR ECC  */
 
 #define CONFIG_MEM_INIT_VALUE	0xDeadBeef