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authorTerry Lv <r65388@freescale.com>2011-08-16 16:06:24 +0800
committerTerry Lv <r65388@freescale.com>2011-08-16 17:04:22 +0800
commitf797ffb751b2c56ad6880e85c983c01661cdde81 (patch)
tree5e94d0019a9dbd818fd7a73a75f75df5b16a3758 /drivers
parentb3f710aa160a9d190c7d6800f74f2da490a048d5 (diff)
ENGR00154889-2: Add virtual iim driver
Add virtual iim driver. This driver will be used by MM team. Signed-off-by: Terry Lv <r65388@freescale.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/char/Kconfig6
-rw-r--r--drivers/char/Makefile1
-rwxr-xr-xdrivers/char/fsl_otp.h4
-rw-r--r--drivers/char/mxs_viim.c175
4 files changed, 184 insertions, 2 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index f7079a27e362..3343d49dc5f0 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -1166,5 +1166,11 @@ config MXC_IIM
help
Support for access to MXC IIM device, most people should say N here.
+config MXS_VIIM
+ tristate "MXS Virtual IIM device driver"
+ depends on (ARCH_MX50 || ARCH_MX6)
+ help
+ Support for access to MXS Virtual IIM device, most people should say N here.
+
endmenu
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index f97d5a0a2810..044d61b7121b 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -86,6 +86,7 @@ obj-$(CONFIG_PS3_FLASH) += ps3flash.o
obj-$(CONFIG_RAMOOPS) += ramoops.o
obj-$(CONFIG_MXC_IIM) += mxc_iim.o
+obj-$(CONFIG_MXS_VIIM) += mxs_viim.o
obj-$(CONFIG_JS_RTC) += js-rtc.o
js-rtc-y = rtc.o
diff --git a/drivers/char/fsl_otp.h b/drivers/char/fsl_otp.h
index fa2b21e12a88..5f779e53e41a 100755
--- a/drivers/char/fsl_otp.h
+++ b/drivers/char/fsl_otp.h
@@ -190,7 +190,7 @@ static int set_otp_timing(struct mxc_otp_platform_data *otp_data)
/* IMX5 does not need to open the bank anymore */
static int otp_read_prepare(struct mxc_otp_platform_data *otp_data)
{
- return set_otp_timing();
+ return set_otp_timing(otp_data);
}
static int otp_read_post(struct mxc_otp_platform_data *otp_data)
{
@@ -202,7 +202,7 @@ static int otp_write_prepare(struct mxc_otp_platform_data *otp_data)
int ret = 0;
/* [1] set timing */
- ret = set_otp_timing();
+ ret = set_otp_timing(otp_data);
if (ret)
return ret;
diff --git a/drivers/char/mxs_viim.c b/drivers/char/mxs_viim.c
new file mode 100644
index 000000000000..31195b39aa42
--- /dev/null
+++ b/drivers/char/mxs_viim.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2009-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+
+/*
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/err.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+
+static unsigned long iim_reg_base0, iim_reg_end0, iim_reg_size0;
+static unsigned long iim_reg_base1, iim_reg_end1, iim_reg_size1;
+static struct device *iim_dev;
+
+/*!
+ * MXS Virtual IIM interface - memory map function
+ * This function maps one page size VIIM registers from VIIM base address0
+ * if the size of the required virtual memory space is less than or equal to
+ * one page size, otherwise this function will also map one page size VIIM
+ * registers from VIIM base address1.
+ *
+ * @param file struct file *
+ * @param vma structure vm_area_struct *
+ *
+ * @return Return 0 on success or negative error code on error
+ */
+static int mxs_viim_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ size_t size = vma->vm_end - vma->vm_start;
+
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+ /* Remap-pfn-range will mark the range VM_IO and VM_RESERVED */
+ if (remap_pfn_range(vma,
+ vma->vm_start,
+ iim_reg_base0 >> PAGE_SHIFT,
+ iim_reg_size0,
+ vma->vm_page_prot))
+ return -EAGAIN;
+
+ if (size > iim_reg_size0) {
+ if (remap_pfn_range(vma,
+ vma->vm_start + iim_reg_size0,
+ iim_reg_base1 >> PAGE_SHIFT,
+ iim_reg_size1,
+ vma->vm_page_prot))
+ return -EAGAIN;
+ }
+
+ return 0;
+}
+
+/*!
+ * MXS Virtual IIM interface - open function
+ *
+ * @param inode struct inode *
+ * @param filp struct file *
+ *
+ * @return Return 0 on success or negative error code on error
+ */
+static int mxs_viim_open(struct inode *inode, struct file *filp)
+{
+ return 0;
+}
+
+/*!
+ * MXS Virtual IIM interface - release function
+ *
+ * @param inode struct inode *
+ * @param filp struct file *
+ *
+ * @return Return 0 on success or negative error code on error
+ */
+static int mxs_viim_release(struct inode *inode, struct file *filp)
+{
+ return 0;
+}
+
+static const struct file_operations mxs_viim_fops = {
+ .mmap = mxs_viim_mmap,
+ .open = mxs_viim_open,
+ .release = mxs_viim_release,
+};
+
+static struct miscdevice mxs_viim_miscdev = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "mxs_viim",
+ .fops = &mxs_viim_fops,
+};
+
+/*!
+ * This function is called by the driver framework to get virtual iim base/end
+ * address and register iim misc device.
+ *
+ * @param dev The device structure for Virtual IIM passed in by the
+ * driver framework.
+ *
+ * @return Returns 0 on success or negative error code on error
+ */
+static int mxs_viim_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret;
+
+ iim_dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (IS_ERR(res)) {
+ dev_err(iim_dev, "Unable to get Virtual IIM resource 0\n");
+ return -ENODEV;
+ }
+
+ iim_reg_base0 = res->start;
+ iim_reg_end0 = res->end;
+ iim_reg_size0 = iim_reg_end0 - iim_reg_base0 + 1;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (IS_ERR(res)) {
+ dev_err(iim_dev, "Unable to get Virtual IIM resource 1\n");
+ return -ENODEV;
+ }
+
+ iim_reg_base1 = res->start;
+ iim_reg_end1 = res->end;
+ iim_reg_size1 = iim_reg_end1 - iim_reg_base1 + 1;
+
+ ret = misc_register(&mxs_viim_miscdev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int mxs_viim_remove(struct platform_device *pdev)
+{
+ misc_deregister(&mxs_viim_miscdev);
+ return 0;
+}
+
+static struct platform_driver mxs_viim_driver = {
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "imx_viim",
+ },
+ .probe = mxs_viim_probe,
+ .remove = mxs_viim_remove,
+};
+
+static int __init mxs_viim_dev_init(void)
+{
+ return platform_driver_register(&mxs_viim_driver);
+}
+
+static void __exit mxs_viim_dev_cleanup(void)
+{
+ platform_driver_unregister(&mxs_viim_driver);
+}
+
+module_init(mxs_viim_dev_init);
+module_exit(mxs_viim_dev_cleanup);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("IMX Virtual IIM driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(MISC_DYNAMIC_MINOR);