Message-Id: <1244189111-19639-19-git-send-email-vapier@gentoo.org>
Date:	Fri,  5 Jun 2009 04:04:27 -0400
From:	Mike Frysinger <vapier@...too.org>
To:	linux-kernel@...r.kernel.org
Cc:	uclinux-dist-devel@...ckfin.uclinux.org
Subject: [PATCH 18/62] Blackfin: simplify BF561 coreb driver greatly

Since 90% of this driver can be handled in user space, move it to the
corebld user space application.

Signed-off-by: Mike Frysinger <vapier@...too.org>
---
 arch/blackfin/mach-bf561/Kconfig |   15 +--
 arch/blackfin/mach-bf561/coreb.c |  396 +++-----------------------------------
 2 files changed, 33 insertions(+), 378 deletions(-)

diff --git a/arch/blackfin/mach-bf561/Kconfig b/arch/blackfin/mach-bf561/Kconfig
index 638ec38..6965dd5 100644
--- a/arch/blackfin/mach-bf561/Kconfig
+++ b/arch/blackfin/mach-bf561/Kconfig
@@ -9,22 +9,9 @@ if (!SMP)
 comment "Core B Support"
 
 config BF561_COREB
-	bool "Enable Core B support"
+	bool "Enable Core B loader"
 	default y
 
-config BF561_COREB_RESET
-	bool "Enable Core B reset support"
-	default n
-	help
-	  This requires code in the application that is loaded
-	  into Core B. In order to reset, the application needs
-	  to install an interrupt handler for Supplemental
-	  Interrupt 0, that sets RETI to 0xff600000 and writes
-	  bit 11 of SICB_SYSCR when bit 5 of SICA_SYSCR is 0.
-	  This causes Core B to stall when Supplemental Interrupt
-	  0 is set, and will reset PC to 0xff600000 when
-	  COREB_SRAM_INIT is cleared.
-
 endif
 
 comment "Interrupt Priority Assignment"
diff --git a/arch/blackfin/mach-bf561/coreb.c b/arch/blackfin/mach-bf561/coreb.c
index 8598098..93635a7 100644
--- a/arch/blackfin/mach-bf561/coreb.c
+++ b/arch/blackfin/mach-bf561/coreb.c
@@ -1,406 +1,74 @@
-/*
- * File:         arch/blackfin/mach-bf561/coreb.c
- * Based on:
- * Author:
+/* Load firmware into Core B on a BF561
  *
- * Created:
- * Description:  Handle CoreB on a BF561
- *
- * Modified:
- *               Copyright 2004-2006 Analog Devices Inc.
- *
- * Bugs:         Enter bugs at http://blackfin.uclinux.org/
- *
- * 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, see the file COPYING, or write
- * to the Free Software Foundation, Inc.,
- * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ * Copyright 2004-2009 Analog Devices Inc.
+ * Licensed under the GPL-2 or later.
+ */
+
+/* The Core B reset func requires code in the application that is loaded into
+ * Core B.  In order to reset, the application needs to install an interrupt
+ * handler for Supplemental Interrupt 0, that sets RETI to 0xff600000 and
+ * writes bit 11 of SICB_SYSCR when bit 5 of SICA_SYSCR is 0.  This causes Core
+ * B to stall when Supplemental Interrupt 0 is set, and will reset PC to
+ * 0xff600000 when COREB_SRAM_INIT is cleared.
  */
 
-#include <linux/mm.h>
-#include <linux/miscdevice.h>
 #include <linux/device.h>
-#include <linux/ioport.h>
-#include <linux/module.h>
-#include <linux/uaccess.h>
 #include <linux/fs.h>
-#include <asm/dma.h>
-#include <asm/cacheflush.h>
-
-#define MODULE_VER		"v0.1"
-
-static spinlock_t coreb_lock;
-static wait_queue_head_t coreb_dma_wait;
-
-#define COREB_IS_OPEN		0x00000001
-#define COREB_IS_RUNNING	0x00000010
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
 
-#define CMD_COREB_INDEX		1
 #define CMD_COREB_START		2
 #define CMD_COREB_STOP		3
 #define CMD_COREB_RESET		4
 
-#define COREB_MINOR		229
-
-static unsigned long coreb_status = 0;
-static unsigned long coreb_base = 0xff600000;
-static unsigned long coreb_size = 0x4000;
-int coreb_dma_done;
-
-static loff_t coreb_lseek(struct file *file, loff_t offset, int origin);
-static ssize_t coreb_read(struct file *file, char *buf, size_t count,
-			  loff_t * ppos);
-static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
-			   loff_t * ppos);
-static int coreb_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
-		       unsigned long arg);
-static int coreb_open(struct inode *inode, struct file *file);
-static int coreb_release(struct inode *inode, struct file *file);
-
-static irqreturn_t coreb_dma_interrupt(int irq, void *dev_id)
-{
-	clear_dma_irqstat(CH_MEM_STREAM2_DEST);
-	coreb_dma_done = 1;
-	wake_up_interruptible(&coreb_dma_wait);
-	return IRQ_HANDLED;
-}
-
-static ssize_t coreb_write(struct file *file, const char *buf, size_t count,
-			   loff_t * ppos)
-{
-	unsigned long p = *ppos;
-	ssize_t wrote = 0;
-
-	if (p + count > coreb_size)
-		return -EFAULT;
-
-	while (count > 0) {
-		int len = count;
-
-		if (len > PAGE_SIZE)
-			len = PAGE_SIZE;
-
-		coreb_dma_done = 0;
-
-		flush_dcache_range((unsigned long)buf, (unsigned long)(buf+len));
-		/* Source Channel */
-		set_dma_start_addr(CH_MEM_STREAM2_SRC, (unsigned long)buf);
-		set_dma_x_count(CH_MEM_STREAM2_SRC, len);
-		set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
-		set_dma_config(CH_MEM_STREAM2_SRC, 0);
-		/* Destination Channel */
-		set_dma_start_addr(CH_MEM_STREAM2_DEST, coreb_base + p);
-		set_dma_x_count(CH_MEM_STREAM2_DEST, len);
-		set_dma_x_modify(CH_MEM_STREAM2_DEST, sizeof(char));
-		set_dma_config(CH_MEM_STREAM2_DEST, WNR | RESTART | DI_EN);
-
-		enable_dma(CH_MEM_STREAM2_SRC);
-		enable_dma(CH_MEM_STREAM2_DEST);
-
-		wait_event_interruptible(coreb_dma_wait, coreb_dma_done);
-
-		disable_dma(CH_MEM_STREAM2_SRC);
-		disable_dma(CH_MEM_STREAM2_DEST);
-
-		count -= len;
-		wrote += len;
-		buf += len;
-		p += len;
-	}
-	*ppos = p;
-	return wrote;
-}
-
-static ssize_t coreb_read(struct file *file, char *buf, size_t count,
-			  loff_t * ppos)
-{
-	unsigned long p = *ppos;
-	ssize_t read = 0;
-
-	if ((p + count) > coreb_size)
-		return -EFAULT;
-
-	while (count > 0) {
-		int len = count;
-
-		if (len > PAGE_SIZE)
-			len = PAGE_SIZE;
-
-		coreb_dma_done = 0;
-
-		invalidate_dcache_range((unsigned long)buf, (unsigned long)(buf+len));
-		/* Source Channel */
-		set_dma_start_addr(CH_MEM_STREAM2_SRC, coreb_base + p);
-		set_dma_x_count(CH_MEM_STREAM2_SRC, len);
-		set_dma_x_modify(CH_MEM_STREAM2_SRC, sizeof(char));
-		set_dma_config(CH_MEM_STREAM2_SRC, 0);
-		/* Destination Channel */
-		set_dma_start_addr(CH_MEM_STREAM2_DEST, (unsigned long)buf);
-		set_dma_x_count(CH_MEM_STREAM2_DEST, len);
-		set_dma_x_modify(CH_MEM_STREAM2_DEST, sizeof(char));
-		set_dma_config(CH_MEM_STREAM2_DEST, WNR | RESTART | DI_EN);
-
-		enable_dma(CH_MEM_STREAM2_SRC);
-		enable_dma(CH_MEM_STREAM2_DEST);
-
-		wait_event_interruptible(coreb_dma_wait, coreb_dma_done);
-
-		disable_dma(CH_MEM_STREAM2_SRC);
-		disable_dma(CH_MEM_STREAM2_DEST);
-
-		count -= len;
-		read += len;
-		buf += len;
-		p += len;
-	}
-
-	return read;
-}
-
-static loff_t coreb_lseek(struct file *file, loff_t offset, int origin)
+static int
+coreb_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
 {
-	loff_t ret;
-
-	mutex_lock(&file->f_dentry->d_inode->i_mutex);
-
-	switch (origin) {
-	case 0 /* SEEK_SET */ :
-		if (offset < coreb_size) {
-			file->f_pos = offset;
-			ret = file->f_pos;
-		} else
-			ret = -EINVAL;
-		break;
-	case 1 /* SEEK_CUR */ :
-		if ((offset + file->f_pos) < coreb_size) {
-			file->f_pos += offset;
-			ret = file->f_pos;
-		} else
-			ret = -EINVAL;
-	default:
-		ret = -EINVAL;
-	}
-	mutex_unlock(&file->f_dentry->d_inode->i_mutex);
-	return ret;
-}
-
-/* No BKL needed here */
-static int coreb_open(struct inode *inode, struct file *file)
-{
-	spin_lock_irq(&coreb_lock);
-
-	if (coreb_status & COREB_IS_OPEN)
-		goto out_busy;
-
-	coreb_status |= COREB_IS_OPEN;
-
-	spin_unlock_irq(&coreb_lock);
-	return 0;
-
- out_busy:
-	spin_unlock_irq(&coreb_lock);
-	return -EBUSY;
-}
-
-static int coreb_release(struct inode *inode, struct file *file)
-{
-	spin_lock_irq(&coreb_lock);
-	coreb_status &= ~COREB_IS_OPEN;
-	spin_unlock_irq(&coreb_lock);
-	return 0;
-}
-
-static int coreb_ioctl(struct inode *inode, struct file *file,
-		       unsigned int cmd, unsigned long arg)
-{
-	int retval = 0;
-	int coreb_index = 0;
+	int ret = 0;
 
 	switch (cmd) {
-	case CMD_COREB_INDEX:
-		if (copy_from_user(&coreb_index, (int *)arg, sizeof(int))) {
-			retval = -EFAULT;
-			break;
-		}
-
-		spin_lock_irq(&coreb_lock);
-		switch (coreb_index) {
-		case 0:
-			coreb_base = 0xff600000;
-			coreb_size = 0x4000;
-			break;
-		case 1:
-			coreb_base = 0xff610000;
-			coreb_size = 0x4000;
-			break;
-		case 2:
-			coreb_base = 0xff500000;
-			coreb_size = 0x8000;
-			break;
-		case 3:
-			coreb_base = 0xff400000;
-			coreb_size = 0x8000;
-			break;
-		default:
-			retval = -EINVAL;
-			break;
-		}
-		spin_unlock_irq(&coreb_lock);
-
-		mutex_lock(&file->f_dentry->d_inode->i_mutex);
-		file->f_pos = 0;
-		mutex_unlock(&file->f_dentry->d_inode->i_mutex);
-		break;
 	case CMD_COREB_START:
-		spin_lock_irq(&coreb_lock);
-		if (coreb_status & COREB_IS_RUNNING) {
-			retval = -EBUSY;
-			break;
-		}
-		printk(KERN_INFO "Starting Core B\n");
-		coreb_status |= COREB_IS_RUNNING;
 		bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() & ~0x0020);
-		SSYNC();
-		spin_unlock_irq(&coreb_lock);
 		break;
-#if defined(CONFIG_BF561_COREB_RESET)
 	case CMD_COREB_STOP:
-		spin_lock_irq(&coreb_lock);
-		printk(KERN_INFO "Stopping Core B\n");
 		bfin_write_SICA_SYSCR(bfin_read_SICA_SYSCR() | 0x0020);
 		bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
-		coreb_status &= ~COREB_IS_RUNNING;
-		spin_unlock_irq(&coreb_lock);
 		break;
 	case CMD_COREB_RESET:
-		printk(KERN_INFO "Resetting Core B\n");
 		bfin_write_SICB_SYSCR(bfin_read_SICB_SYSCR() | 0x0080);
 		break;
-#endif
+	default:
+		ret = -EINVAL;
+		break;
 	}
 
-	return retval;
+	CSYNC();
+
+	return ret;
 }
 
 static struct file_operations coreb_fops = {
-	.owner = THIS_MODULE,
-	.llseek = coreb_lseek,
-	.read = coreb_read,
-	.write = coreb_write,
-	.ioctl = coreb_ioctl,
-	.open = coreb_open,
-	.release = coreb_release
+	.owner   = THIS_MODULE,
+	.ioctl   = coreb_ioctl,
 };
 
 static struct miscdevice coreb_dev = {
-	COREB_MINOR,
-	"coreb",
-	&coreb_fops
+	.minor = MISC_DYNAMIC_MINOR,
+	.name  = "coreb",
+	.fops  = &coreb_fops,
 };
 
-static ssize_t coreb_show_status(struct device *dev, struct device_attribute *attr, char *buf)
+static int __init bf561_coreb_init(void)
 {
-	return sprintf(buf,
-		       "Base Address:\t0x%08lx\n"
-		       "Core B is %s\n"
-		       "SICA_SYSCR:\t%04x\n"
-		       "SICB_SYSCR:\t%04x\n"
-		       "\n"
-		       "IRQ Status:\tCore A\t\tCore B\n"
-		       "ISR0:\t\t%08x\t\t%08x\n"
-		       "ISR1:\t\t%08x\t\t%08x\n"
-		       "IMASK0:\t\t%08x\t\t%08x\n"
-		       "IMASK1:\t\t%08x\t\t%08x\n",
-		       coreb_base,
-		       coreb_status & COREB_IS_RUNNING ? "running" : "stalled",
-		       bfin_read_SICA_SYSCR(), bfin_read_SICB_SYSCR(),
-		       bfin_read_SICA_ISR0(), bfin_read_SICB_ISR0(),
-		       bfin_read_SICA_ISR1(), bfin_read_SICB_ISR0(),
-		       bfin_read_SICA_IMASK0(), bfin_read_SICB_IMASK0(),
-		       bfin_read_SICA_IMASK1(), bfin_read_SICB_IMASK1());
-}
-
-static DEVICE_ATTR(coreb_status, S_IRUGO, coreb_show_status, NULL);
-
-int __init bf561_coreb_init(void)
-{
-	init_waitqueue_head(&coreb_dma_wait);
-
-	spin_lock_init(&coreb_lock);
-	/* Request the core memory regions for Core B */
-	if (request_mem_region(0xff600000, 0x4000,
-			       "Core B - Instruction SRAM") == NULL)
-		goto exit;
-
-	if (request_mem_region(0xFF610000, 0x4000,
-			       "Core B - Instruction SRAM") == NULL)
-		goto release_instruction_a_sram;
-
-	if (request_mem_region(0xFF500000, 0x8000,
-			       "Core B - Data Bank B SRAM") == NULL)
-		goto release_instruction_b_sram;
-
-	if (request_mem_region(0xff400000, 0x8000,
-			       "Core B - Data Bank A SRAM") == NULL)
-		goto release_data_b_sram;
-
-	if (request_dma(CH_MEM_STREAM2_DEST, "Core B - DMA Destination") < 0)
-		goto release_data_a_sram;
-
-	if (request_dma(CH_MEM_STREAM2_SRC, "Core B - DMA Source") < 0)
-		goto release_dma_dest;
-
-	set_dma_callback(CH_MEM_STREAM2_DEST, coreb_dma_interrupt, NULL);
-
-	misc_register(&coreb_dev);
-
-	if (device_create_file(coreb_dev.this_device, &dev_attr_coreb_status))
-		goto release_dma_src;
-
-	printk(KERN_INFO "BF561 Core B driver %s initialized.\n", MODULE_VER);
-	return 0;
-
- release_dma_src:
-	free_dma(CH_MEM_STREAM2_SRC);
- release_dma_dest:
-	free_dma(CH_MEM_STREAM2_DEST);
- release_data_a_sram:
-	release_mem_region(0xff400000, 0x8000);
- release_data_b_sram:
-	release_mem_region(0xff500000, 0x8000);
- release_instruction_b_sram:
-	release_mem_region(0xff610000, 0x4000);
- release_instruction_a_sram:
-	release_mem_region(0xff600000, 0x4000);
- exit:
-	return -ENOMEM;
+	return misc_register(&coreb_dev);
 }
+module_init(bf561_coreb_init);
 
-void __exit bf561_coreb_exit(void)
+static void __exit bf561_coreb_exit(void)
 {
-	device_remove_file(coreb_dev.this_device, &dev_attr_coreb_status);
 	misc_deregister(&coreb_dev);
-
-	release_mem_region(0xff610000, 0x4000);
-	release_mem_region(0xff600000, 0x4000);
-	release_mem_region(0xff500000, 0x8000);
-	release_mem_region(0xff400000, 0x8000);
-
-	free_dma(CH_MEM_STREAM2_DEST);
-	free_dma(CH_MEM_STREAM2_SRC);
 }
-
-module_init(bf561_coreb_init);
 module_exit(bf561_coreb_exit);
 
 MODULE_AUTHOR("Bas Vermeulen <bvermeul@...ckstar.xs4all.nl>");
-- 
1.6.3.1

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