openwrt/target/linux/coldfire/patches/032-m5445x_edma_update.patch

From 7b5b08d99d5362e9c36fd7d42d6c06c2a848266c Mon Sep 17 00:00:00 2001
From: Kurt Mahan <[email protected]>
Date: Sun, 9 Dec 2007 02:21:19 -0700
Subject: [PATCH] Update EDMA.

LTIBName: m5445x-edma-update
Signed-off-by: Kurt Mahan <[email protected]>
---
 drivers/spi/coldfire_edma.c      |  261 +++++++++++++++++++++++---------------
 include/asm-m68k/coldfire_edma.h |    9 +-
 include/asm-m68k/mcf5445x_edma.h |   28 +++-
 3 files changed, 188 insertions(+), 110 deletions(-)

--- a/drivers/spi/coldfire_edma.c
+++ b/drivers/spi/coldfire_edma.c
@@ -20,76 +20,91 @@
 #include <linux/cdev.h>
 #include <linux/seq_file.h>
 #include <linux/proc_fs.h>
+#ifdef CONFIG_M54455
 #include <asm/mcf5445x_edma.h>
 #include <asm/mcf5445x_intc.h>
+#endif /* CONFIG_M54455 */
 #include <asm/coldfire_edma.h>
 
-
-/* callback handler data for each TCD */
+/*
+ * Callback handler data for each TCD
+ */
 struct edma_isr_record {
-	edma_irq_handler irq_handler;       /* interrupt handler */
-	edma_error_handler error_handler;	/* error interrupt handler */
-	void* dev;							/* device used for the channel */
-	int  allocated;						/* busy flag */
-	spinlock_t *lock;					/* spin lock (if needs to be locked in interrupt) */
-	const char* device_id;				/* device id string, used in proc file system */
+	edma_irq_handler irq_handler;	  /* interrupt handler */
+	edma_error_handler error_handler; /* error interrupt handler */
+	void *arg;			  /* argument to pass back */
+	int allocated;			  /* busy flag */
+	spinlock_t *lock;		  /* spin lock (optional) */
+	const char *device_id;		  /* dev id string, used in procfs */
 };
 
-/* device structure */
+/*
+ * Device structure
+ */
 struct coldfire_edma_dev {
-	struct cdev cdev; 			/* character device */
-	struct edma_isr_record dma_interrupt_handlers[EDMA_CHANNELS]; /* channel handlers */
+	struct cdev cdev;		  /* character device */
+	struct edma_isr_record dma_interrupt_handlers[EDMA_CHANNELS];
 };
 
 /* allocated major device number */
 static int coldfire_dma_major;
+
 /* device driver structure */
-static struct coldfire_edma_dev* devp = NULL;
+static struct coldfire_edma_dev *devp = NULL;
 
 /* device driver file operations */
 struct file_operations coldfire_edma_fops = {
 	.owner = THIS_MODULE,
 };
 
-/* eDMA channel interrupt handler */
+/**
+ * dmaisr - eDMA channel interrupt handler
+ * @irq: interrupt number
+ * @dev_id: argument
+ */
 static int dmaisr(int irq, void *dev_id)
 {
 	int channel = irq - EDMA_INT_CONTROLLER_BASE - EDMA_INT_CHANNEL_BASE;
 	int result = IRQ_HANDLED;
 
-	if (devp!=NULL && devp->dma_interrupt_handlers[channel].lock) {
-		spin_lock(devp->dma_interrupt_handlers[channel].lock);
-	}
+	if ((devp != NULL) &&
+	    (devp->dma_interrupt_handlers[channel].irq_handler)) {
+		/* call user irq handler */
+		if (devp->dma_interrupt_handlers[channel].lock)
+			spin_lock(devp->dma_interrupt_handlers[channel].lock);
+
+		result = devp->dma_interrupt_handlers[channel].irq_handler(
+			channel, devp->dma_interrupt_handlers[channel].arg);
 
-	if (devp!=NULL && devp->dma_interrupt_handlers[channel].irq_handler) {
-		result = devp->dma_interrupt_handlers[channel].irq_handler(channel,
-							devp->dma_interrupt_handlers[channel].dev);
+   		if (devp->dma_interrupt_handlers[channel].lock)
+			spin_unlock(devp->dma_interrupt_handlers[channel].lock);
 	} else {
+		/* no irq handler so just ack it */
 		confirm_edma_interrupt_handled(channel);
-		printk(EDMA_DRIVER_NAME ": No handler for DMA channel %d\n", channel);
-	}
-
-   	if (devp!=NULL && devp->dma_interrupt_handlers[channel].lock) {
-		spin_unlock(devp->dma_interrupt_handlers[channel].lock);
+		printk(EDMA_DRIVER_NAME ": No handler for DMA channel %d\n",
+		       channel);
 	}
 
 	return result;
 }
 
-/* eDMA error interrupt handler */
+/**
+ * dma_error_isr - eDMA error interrupt handler
+ * @irq: interrupt number
+ * @dev_id: argument
+ */
 static int dma_error_isr(int irq, void* dev_id)
 {
 	u16 err;
 	int i;
 
 	err = MCF_EDMA_ERR;
-	for (i=0;i<EDMA_CHANNELS;i++) {
+	for (i=0; i<EDMA_CHANNELS; i++) {
 		if (err & (1<<i)) {
-			if (devp!=NULL && devp->dma_interrupt_handlers[i].error_handler) {
-				devp->dma_interrupt_handlers[i].error_handler(i, devp->dma_interrupt_handlers[i].dev);
-			} else {
+			if (devp!=NULL && devp->dma_interrupt_handlers[i].error_handler)
+				devp->dma_interrupt_handlers[i].error_handler(i, devp->dma_interrupt_handlers[i].arg);
+			else
 				printk(KERN_WARNING EDMA_DRIVER_NAME ": DMA error on channel %d\n", i);
-			}
 		}
 	}
 
@@ -97,11 +112,26 @@ static int dma_error_isr(int irq, void* 
 	return IRQ_HANDLED;
 }
 
-/* sets channel parameters */
+/**
+ * set_edma_params - Set transfer control descriptor (TCD)
+ * @channel: channel number
+ * @source: source address
+ * @dest: destination address
+ * @attr: attributes
+ * @soff: source offset
+ * @nbytes: number of bytes to be transfered in minor loop
+ * @slast: last source address adjustment
+ * @citer: major loop count
+ * @biter: beginning minor loop count
+ * @doff: destination offset
+ * @dlast_sga: last destination address adjustment
+ * @major_int: generate interrupt after each major loop
+ * @disable_req: disable DMA request after major loop
+ */
 void set_edma_params(int channel, u32 source, u32 dest,
-					 u32 attr, u32 soff, u32 nbytes, u32 slast,
-					 u32 citer, u32 biter, u32 doff, u32 dlast_sga,
-					 int major_int, int disable_req)
+	u32 attr, u32 soff, u32 nbytes, u32 slast,
+	u32 citer, u32 biter, u32 doff, u32 dlast_sga,
+	int major_int, int disable_req)
 {
 
 	if (channel<0 || channel>EDMA_CHANNELS)
@@ -117,45 +147,56 @@ void set_edma_params(int channel, u32 so
 	MCF_EDMA_TCD_BITER(channel)=MCF_EDMA_TCD_BITER_BITER(biter);
 	MCF_EDMA_TCD_DOFF(channel) = MCF_EDMA_TCD_DOFF_DOFF(doff);
 	MCF_EDMA_TCD_DLAST_SGA(channel) = MCF_EDMA_TCD_DLAST_SGA_DLAST_SGA(dlast_sga);
+
 	/* interrupt at the end of major loop */
-	if (major_int) {
+	if (major_int)
 		MCF_EDMA_TCD_CSR(channel) |= MCF_EDMA_TCD_CSR_INT_MAJOR;
-	} else {
+	else
 		MCF_EDMA_TCD_CSR(channel) &= ~MCF_EDMA_TCD_CSR_INT_MAJOR;
-	}
+
 	/* disable request at the end of major loop of transfer or not*/
-	if (disable_req) {
+	if (disable_req)
 		MCF_EDMA_TCD_CSR(channel) |= MCF_EDMA_TCD_CSR_D_REQ;
-	} else {
+	else
 		MCF_EDMA_TCD_CSR(channel) &= ~MCF_EDMA_TCD_CSR_D_REQ;
-	}
-
 }
 EXPORT_SYMBOL(set_edma_params);
 
-/* init eDMA controller */
+/**
+ * init_edma - Initialize the eDMA controller
+ */
 void init_edma(void)
 {
 	MCF_EDMA_CR = 0;
 }
 EXPORT_SYMBOL(init_edma);
 
-/* request eDMA channel */
+/**
+ * request_edma_channel - Request an eDMA channel
+ * @channel: channel number
+ * @handler: dma handler
+ * @error_handler: dma error handler
+ * @arg: argument to pass back
+ * @lock: optional spinlock to hold over interrupt
+ * @device_id: device id
+ *
+ * Returns 0 if success or a negative value if failure
+ */
 int request_edma_channel(int channel,
-						edma_irq_handler handler,
-						edma_error_handler error_handler,
-						void* dev,
-						spinlock_t *lock,
-						const char* device_id )
+	edma_irq_handler handler,
+	edma_error_handler error_handler,
+	void *arg,
+	spinlock_t *lock,
+	const char *device_id )
 {
 	if (devp!=NULL && channel>=0 && channel<=EDMA_CHANNELS) {
-		if (devp->dma_interrupt_handlers[channel].allocated) {
+		if (devp->dma_interrupt_handlers[channel].allocated)
 			return -EBUSY;
-		}
+
 		devp->dma_interrupt_handlers[channel].allocated = 1;
 		devp->dma_interrupt_handlers[channel].irq_handler = handler;
 		devp->dma_interrupt_handlers[channel].error_handler = error_handler;
-		devp->dma_interrupt_handlers[channel].dev = dev;
+		devp->dma_interrupt_handlers[channel].arg = arg;
 		devp->dma_interrupt_handlers[channel].lock = lock;
 		devp->dma_interrupt_handlers[channel].device_id = device_id;
 		return 0;
@@ -164,16 +205,22 @@ int request_edma_channel(int channel,
 }
 EXPORT_SYMBOL(request_edma_channel);
 
-/* free eDMA channel */
-int free_edma_channel(int channel, void* dev)
+/**
+ * free_edma_channel - Free the edma channel
+ * @channel: channel number
+ * @arg: argument created with
+ *
+ * Returns 0 if success or a negative value if failure
+ */
+int free_edma_channel(int channel, void *arg)
 {
 	if (devp!=NULL && channel>=0 && channel<=EDMA_CHANNELS) {
 		if (devp->dma_interrupt_handlers[channel].allocated) {
-			if (devp->dma_interrupt_handlers[channel].dev != dev) {
+			if (devp->dma_interrupt_handlers[channel].arg != arg)
 				return -EBUSY;
-			}
+
 			devp->dma_interrupt_handlers[channel].allocated = 0;
-			devp->dma_interrupt_handlers[channel].dev = NULL;
+			devp->dma_interrupt_handlers[channel].arg = NULL;
 			devp->dma_interrupt_handlers[channel].irq_handler = NULL;
 			devp->dma_interrupt_handlers[channel].error_handler = NULL;
 			devp->dma_interrupt_handlers[channel].lock = NULL;
@@ -184,7 +231,9 @@ int free_edma_channel(int channel, void*
 }
 EXPORT_SYMBOL(free_edma_channel);
 
-/* clean-up device driver allocated resources */
+/**
+ * coldfire_edma_cleanup - cleanup driver allocated resources
+ */
 static void coldfire_edma_cleanup(void)
 {
 	dev_t devno;
@@ -192,13 +241,10 @@ static void coldfire_edma_cleanup(void)
 
 	/* free interrupts/memory */
 	if (devp) {
-		for (i=0;i<EDMA_CHANNELS;i++)
-		{
-			MCF_INTC0_SIMR = EDMA_INT_CHANNEL_BASE+i;
-			free_irq(EDMA_INT_CHANNEL_BASE+EDMA_INT_CONTROLLER_BASE+i,	devp);
-		}
-		MCF_INTC0_SIMR = EDMA_INT_CHANNEL_BASE+EDMA_CHANNELS;
-		free_irq(EDMA_INT_CHANNEL_BASE+EDMA_INT_CONTROLLER_BASE+EDMA_CHANNELS, devp);
+		for (i=0; i<EDMA_CHANNELS; i++)
+			free_irq(EDMA_INT_BASE+i, devp);
+
+		free_irq(EDMA_INT_BASE+EDMA_INT_ERR, devp);
 		cdev_del(&devp->cdev);
 		kfree(devp);
 	}
@@ -209,30 +255,42 @@ static void coldfire_edma_cleanup(void)
 }
 
 #ifdef CONFIG_PROC_FS
-/* proc file system support */
+/*
+ * proc file system support
+ */
 
 #define FREE_CHANNEL "free"
 #define DEVICE_UNKNOWN "device unknown"
 
+/**
+ * proc_edma_show - print out proc info
+ * @m: seq_file
+ * @v:
+ */
 static int proc_edma_show(struct seq_file *m, void *v)
 {
 	int i;
 
-	if (devp==NULL) return 0;
+	if (devp == NULL)
+		return 0;
 
 	for (i = 0 ; i < EDMA_CHANNELS ; i++) {
 		if (devp->dma_interrupt_handlers[i].allocated) {
 			if (devp->dma_interrupt_handlers[i].device_id)
-		    	seq_printf(m, "%2d: %s\n", i, devp->dma_interrupt_handlers[i].device_id);
+		    		seq_printf(m, "%2d: %s\n", i, devp->dma_interrupt_handlers[i].device_id);
 			else
 				seq_printf(m, "%2d: %s\n", i, DEVICE_UNKNOWN);
-		} else {
+		} else
 			seq_printf(m, "%2d: %s\n", i, FREE_CHANNEL);
-		}
 	}
 	return 0;
 }
 
+/**
+ * proc_edma_open - open the proc file
+ * @inode: inode ptr
+ * @file: file ptr
+ */
 static int proc_edma_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, proc_edma_show, NULL);
@@ -245,6 +303,9 @@ static const struct file_operations proc
 	.release	= single_release,
 };
 
+/**
+ * proc_edma_init - initialize proc filesystem
+ */
 static int __init proc_edma_init(void)
 {
 	struct proc_dir_entry *e;
@@ -258,7 +319,9 @@ static int __init proc_edma_init(void)
 
 #endif
 
-/* initializes device driver */
+/**
+ * coldfire_edma_init - eDMA module init
+ */
 static int __init coldfire_edma_init(void)
 {
 	dev_t dev;
@@ -267,8 +330,9 @@ static int __init coldfire_edma_init(voi
 
 	/* allocate free major number */
 	result = alloc_chrdev_region(&dev, DMA_DEV_MINOR, 1, EDMA_DRIVER_NAME);
-	if (result<0) {
-		printk(KERN_WARNING EDMA_DRIVER_NAME": can't get major %d\n", result);
+	if (result < 0) {
+		printk(KERN_WARNING EDMA_DRIVER_NAME": can't get major %d\n",
+		       result);
 		return result;
 	}
 	coldfire_dma_major = MAJOR(dev);
@@ -280,71 +344,68 @@ static int __init coldfire_edma_init(voi
 		goto fail;
 	}
 
-	/* init handlers (no handlers for beggining) */
-   	for (i=0;i<EDMA_CHANNELS;i++) {
+	/* init handlers (no handlers for beginning) */
+   	for (i = 0; i < EDMA_CHANNELS; i++) {
 		devp->dma_interrupt_handlers[i].irq_handler = NULL;
 		devp->dma_interrupt_handlers[i].error_handler = NULL;
-		devp->dma_interrupt_handlers[i].dev = NULL;
+		devp->dma_interrupt_handlers[i].arg = NULL;
 		devp->dma_interrupt_handlers[i].allocated = 0;
 		devp->dma_interrupt_handlers[i].lock = NULL;
 		devp->dma_interrupt_handlers[i].device_id = NULL;
 	}
 
-    /* register char device */
+	/* register char device */
 	cdev_init(&devp->cdev, &coldfire_edma_fops);
 	devp->cdev.owner = THIS_MODULE;
 	devp->cdev.ops = &coldfire_edma_fops;
 	result = cdev_add(&devp->cdev, dev, 1);
 	if (result) {
-		printk(KERN_NOTICE EDMA_DRIVER_NAME": Error %d adding coldfire-dma device\n", result);
+		printk(KERN_NOTICE EDMA_DRIVER_NAME
+		       ": Error %d adding coldfire-dma device\n", result);
 		result = -ENODEV;
 		goto fail;
 	}
 
 	/* request/enable irq for each eDMA channel */
-	for (i=0;i<EDMA_CHANNELS;i++)
-	{
-		result = request_irq(EDMA_INT_CHANNEL_BASE+EDMA_INT_CONTROLLER_BASE+i,
-			dmaisr, SA_INTERRUPT, EDMA_DRIVER_NAME, devp);
+	for (i = 0; i < EDMA_CHANNELS;i++) {
+		result = request_irq(EDMA_INT_BASE + i,
+				     dmaisr, IRQF_DISABLED,
+				     EDMA_DRIVER_NAME, devp);
 		if (result) {
-			printk(KERN_WARNING EDMA_DRIVER_NAME": Cannot request irq %d\n",
-				EDMA_INT_CHANNEL_BASE+EDMA_INT_CONTROLLER_BASE+i);
+			printk(KERN_WARNING EDMA_DRIVER_NAME
+			       ": Cannot request irq %d\n",
+			       (EDMA_INT_BASE + EDMA_INT_ERR+i));
 			result = -EBUSY;
 			goto fail;
 		}
-
-		MCF_INTC0_ICR(EDMA_INT_CHANNEL_BASE+i) = EDMA_IRQ_LEVEL;
-		MCF_INTC0_CIMR = EDMA_INT_CHANNEL_BASE+i;
-
 	}
 
-    /* request error interrupt */
-	result = request_irq(EDMA_INT_CHANNEL_BASE + EDMA_INT_CONTROLLER_BASE + EDMA_CHANNELS,
-				dma_error_isr, SA_INTERRUPT, EDMA_DRIVER_NAME, devp);
+	/* request error interrupt */
+	result = request_irq(EDMA_INT_BASE + EDMA_INT_ERR,
+			     dma_error_isr, IRQF_DISABLED,
+			     EDMA_DRIVER_NAME, devp);
 	if (result) {
-		printk(KERN_WARNING EDMA_DRIVER_NAME": Cannot request irq %d\n",
-				EDMA_INT_CHANNEL_BASE+EDMA_INT_CONTROLLER_BASE+EDMA_CHANNELS);
+		printk(KERN_WARNING EDMA_DRIVER_NAME
+		       ": Cannot request irq %d\n",
+		       (EDMA_INT_BASE + EDMA_INT_ERR));
 		result = -EBUSY;
 		goto fail;
 	}
 
-	/* enable error interrupt in interrupt controller */
-	MCF_INTC0_ICR(EDMA_INT_CHANNEL_BASE+EDMA_CHANNELS) = EDMA_IRQ_LEVEL;
-	MCF_INTC0_CIMR = EDMA_INT_CHANNEL_BASE+EDMA_CHANNELS;
-
 #ifdef CONFIG_PROC_FS
 	proc_edma_init();
 #endif
 
 	printk(EDMA_DRIVER_NAME ": initialized successfully\n");
-
 	return 0;
 fail:
 	coldfire_edma_cleanup();
 	return result;
-
 }
 
+/**
+ * coldfire_edma_exit - eDMA module exit
+ */
 static void __exit coldfire_edma_exit(void)
 {
 	coldfire_edma_cleanup();
@@ -354,5 +415,5 @@ module_init(coldfire_edma_init);
 module_exit(coldfire_edma_exit);
 
 MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Yaroslav Vinogradov, Freescale Inc.");
-MODULE_DESCRIPTION("eDMA library for Coldfire 5445x");
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("eDMA library for Coldfire M5445x");
--- a/include/asm-m68k/coldfire_edma.h
+++ b/include/asm-m68k/coldfire_edma.h
@@ -20,11 +20,14 @@
 #define EDMA_DRIVER_NAME "ColdFire-eDMA"
 #define DMA_DEV_MINOR 1
 
+#ifdef CONFIG_M54455
 #define EDMA_INT_CHANNEL_BASE 		8
 #define EDMA_INT_CONTROLLER_BASE 	64
+#define EDMA_INT_BASE			(EDMA_INT_CHANNEL_BASE + \
+					 EDMA_INT_CONTROLLER_BASE)
 #define EDMA_CHANNELS			16
- 
-#define EDMA_IRQ_LEVEL			5
+#define EDMA_INT_ERR			16	/* edma error interrupt */
+#endif /* CONFIG_M54455 */
  
 typedef irqreturn_t (*edma_irq_handler)(int, void *);
 typedef void (*edma_error_handler)(int, void *);
@@ -38,7 +41,7 @@ typedef void (*edma_error_handler)(int, 
  *   nbytes  - number of bytes to be transfered in minor loop
  *   slast   - last source address adjustment
  *   citer   - major loop count
- *   biter   - beggining minor loop count
+ *   biter   - begining minor loop count
  *   doff    - destination offset
  *   dlast_sga - last destination address adjustment
  *   major_int - generate interrupt after each major loop
--- a/include/asm-m68k/mcf5445x_edma.h
+++ b/include/asm-m68k/mcf5445x_edma.h
@@ -11,11 +11,27 @@
 #ifndef __MCF5445X_EDMA_H__
 #define __MCF5445X_EDMA_H__
 
-/*********************************************************************
-*
-* Enhanced DMA (EDMA)
-*
-*********************************************************************/
+/*
+ * Enhanced DMA (EDMA)
+ */
+
+/* Channels */
+#define MCF_EDMA_CHAN_DREQ0	0	/* External DMA request 0 */
+#define MCF_EDMA_CHAN_DREQ1	1	/* External DMA request 1 */
+#define MCF_EDMA_CHAN_UART0_RX	2	/* UART0 Receive */
+#define MCF_EDMA_CHAN_UART0_TX	3	/* UART0 Transmit */
+#define MCF_EDMA_CHAN_UART1_RX	4	/* UART1 Receive */
+#define MCF_EDMA_CHAN_UART1_TX	5	/* UART1 Transmit */
+#define MCF_EDMA_CHAN_UART2_RX	6	/* UART2 Receive */
+#define MCF_EDMA_CHAN_UART2_TX	7	/* UART2 Transmit */
+#define MCF_EDMA_CHAN_TIMER0	8	/* Timer 0 / SSI0 Rx */
+#define MCF_EDMA_CHAN_TIMER1	9	/* Timer 1 / SSI1 Rx */
+#define MCF_EDMA_CHAN_TIMER2	10	/* Timer 2 / SSI0 Tx */
+#define MCF_EDMA_CHAN_TIMER3	11	/* Timer 3 / SSI1 Tx */
+#define MCF_EDMA_CHAN_DSPI_RX	12	/* DSPI Receive */
+#define MCF_EDMA_CHAN_DSPI_TX	13	/* DSPI Transmit */
+#define MCF_EDMA_CHAN_ATA_RX	14	/* ATA Receive */
+#define MCF_EDMA_CHAN_ATA_TX	15	/* ATA Transmit */
 
 /* Register read/write macros */
 #define MCF_EDMA_CR                     MCF_REG32(0xFC044000)
@@ -1453,6 +1469,4 @@
 #define MCF_EDMA_TCD15_CSR_LINKCH(x)    (((x)&0x003F)<<8)
 #define MCF_EDMA_TCD15_CSR_BWC(x)       (((x)&0x0003)<<14)
 
-/********************************************************************/
-
 #endif /* __MCF5445X_EDMA_H__ */