Hi Steve,
Steve Bennett wrote:
This patch adds a driver for simple access to the
Coldfire Internal Peripheral System (IPS) address space
via the /dev/ips char device.
Signed-Off-By: Steve Bennett <[EMAIL PROTECTED]>
I have some reservations about this one. Working with peripheral
space registers from user space is not something I want to
encourage.
And, even if I did, wouldn't mmap be a better interface to
them?
Regards
greg
diff -urN uClinux-dist.orig/linux-2.6.x/drivers/char/Makefile
uClinux-dist/linux-2.6.x/drivers/char/Makefile
--- uClinux-dist.orig/linux-2.6.x/drivers/char/Makefile 2006-11-30
12:03:15.000000000 +1000
+++ uClinux-dist/linux-2.6.x/drivers/char/Makefile 2007-05-11
16:12:16.000000000 +1000
@@ -54,6 +54,7 @@
obj-$(CONFIG_HVCS) += hvcs.o
obj-$(CONFIG_SGI_MBCS) += mbcs.o
obj-$(CONFIG_MCF_QSPI) += mcf_qspi.o
+obj-$(CONFIG_MCF_IPS) += mcf_ips.o
obj-$(CONFIG_BRIQ_PANEL) += briq_panel.o
obj-$(CONFIG_PRINTER) += lp.o
diff -urN uClinux-dist.orig/linux-2.6.x/drivers/char/mcf_ips.c
uClinux-dist/linux-2.6.x/drivers/char/mcf_ips.c
--- uClinux-dist.orig/linux-2.6.x/drivers/char/mcf_ips.c 1970-01-01
10:00:00.000000000 +1000
+++ uClinux-dist/linux-2.6.x/drivers/char/mcf_ips.c 2007-05-11
16:12:16.000000000 +1000
@@ -0,0 +1,184 @@
+/*
+ * linux-2.4.x/drivers/char/mcf_ips.c
+ *
+ * Internal Peripheral System Access Driver
+ *
+ * Copyright (C) 2005 Intec Automation ([EMAIL PROTECTED])
+ *
+ *
+ * Provides simple access to the Coldfire Internal Peripheral System
+ * address space via the /dev/ips char device.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/device.h>
+#include <linux/miscdevice.h>
+
+#define DEVICE_NAME "ips"
+
+/* Use a dynamically assigned misc device minor */
+/*#define IPS_MAJOR 0*/
+/* Or a statically assigned device major */
+#define IPS_MAJOR 122
+
+MODULE_AUTHOR("Mike Lavender <[EMAIL PROTECTED]>");
+MODULE_DESCRIPTION("Driver for Reading and Writing Peripherals");
+MODULE_SUPPORTED_DEVICE("Motorola MCF5282");
+MODULE_LICENSE("GPL");
+
+/* ioctl to set the read/write address */
+#define IPS_REG_SET 1
+
+static ssize_t
+ ips_read(
+ struct file *file,
+ char *buffer,
+ size_t length,
+ loff_t *offset )
+{
+ int ret = 0;
+
+ switch (length)
+ {
+ case 1:
+ *(char *)buffer = *(char *)file->private_data;
+ ret = 1;
+ break;
+ case 2:
+ *(short *)buffer = *(short *)file->private_data;
+ ret = 2;
+ break;
+ case 4:
+ *(int *)buffer = *(int *)file->private_data;
+ ret = 4;
+ break;
+ default:
+ memcpy( buffer, (char *)file->private_data, length );
+ ret = length;
+ }
+
+ return (ret);
+}
+
+static ssize_t
+ ips_write(
+ struct file *file,
+ const char *buffer,
+ size_t length,
+ loff_t *offset )
+{
+ int ret = 0;
+
+ switch (length)
+ {
+ case 1:
+ *(char *)file->private_data = *(char *)buffer;
+ ret = 1;
+ break;
+ case 2:
+ *(short *)file->private_data = *(short *)buffer;
+ ret = 2;
+ break;
+ case 4:
+ *(int *)file->private_data = *(int *)buffer;
+ ret = 4;
+ break;
+ default:
+ memcpy( (char *)file->private_data, buffer, length );
+ ret = length;
+ }
+
+ return (ret);
+}
+
+int
+ ips_ioctl(
+ struct inode *inode,
+ struct file *file,
+ unsigned int ioctl_num,
+ unsigned long ioctl_param )
+{
+ int ret = 0;
+
+ switch (ioctl_num) {
+ case IPS_REG_SET:
+ file->private_data = (void *)ioctl_param;
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ return (ret);
+}
+
+static int
+ ips_open(
+ struct inode *inode,
+ struct file *file )
+{
+ return 0;
+}
+
+static int
+ ips_release(
+ struct inode *inode,
+ struct file *file )
+{
+ return 0;
+}
+
+/* fixed for 2.4 kernel, owner was ifdef'ed out for 2.0 kernel */
+static struct file_operations fops = {
+ owner: THIS_MODULE,
+ read: ips_read,
+ write: ips_write,
+ ioctl: ips_ioctl,
+ open: ips_open,
+ release: ips_release /* a.k.a. close */
+};
+
+#if IPS_MAJOR == 0
+static struct miscdevice misc_fops = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = DEVICE_NAME,
+ .fops = &fops
+};
+#endif
+
+int __init
+ ips_init(void)
+{
+ int ret;
+
+#if IPS_MAJOR == 0
+ ret = misc_register(&misc_fops);
+#else
+ ret = register_chrdev(IPS_MAJOR, DEVICE_NAME, &fops);
+#endif
+
+ if (ret < 0) {
+ return -EIO;
+ }
+
+ printk("MCF IPS device driver installed\n");
+
+ return 0;
+}
+
+void __exit
+ ips_exit(void)
+{
+#if IPS_MAJOR == 0
+ misc_deregister(&misc_fops);
+#else
+ unregister_chrdev(IPS_MAJOR, DEVICE_NAME);
+#endif
+}
+
+module_init(ips_init);
+module_exit(ips_exit);
diff -urN uClinux-dist.orig/linux-2.6.x/drivers/char/Kconfig
uClinux-dist/linux-2.6.x/drivers/char/Kconfig
--- uClinux-dist.orig/linux-2.6.x/drivers/char/Kconfig 2006-12-07
17:19:47.000000000 +1000
+++ uClinux-dist/linux-2.6.x/drivers/char/Kconfig 2007-05-11
16:12:16.000000000 +1000
@@ -1088,6 +1088,14 @@
help
Driver for Coldfire processors QSPI
+config MCF_IPS
+ tristate "Coldfire IPS access"
+ default n
+ depends on COLDFIRE
+ help
+ Simple access to the Coldfire Internal Peripheral System address space
+ via the /dev/ips char device.
+
config M41T11M6
tristate "M41T11M6 Real Time Clock (RTC) support"
help
------------------------------------------------------------------------
_______________________________________________
uClinux-dev mailing list
[email protected]
http://mailman.uclinux.org/mailman/listinfo/uclinux-dev
This message was resent by [email protected]
To unsubscribe see:
http://mailman.uclinux.org/mailman/options/uclinux-dev
--
------------------------------------------------------------------------
Greg Ungerer -- Chief Software Dude EMAIL: [EMAIL PROTECTED]
Secure Computing Corporation PHONE: +61 7 3435 2888
825 Stanley St, FAX: +61 7 3891 3630
Woolloongabba, QLD, 4102, Australia WEB: http://www.SnapGear.com
_______________________________________________
uClinux-dev mailing list
[email protected]
http://mailman.uclinux.org/mailman/listinfo/uclinux-dev
This message was resent by [email protected]
To unsubscribe see:
http://mailman.uclinux.org/mailman/options/uclinux-dev
