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authorTerry Lv <r65388@freescale.com>2011-08-16 16:06:24 +0800
committerEric Miao <eric.miao@linaro.org>2012-01-11 13:57:11 +0800
commit8f2d2c660964932bcdf13b2437292ce27a716a38 (patch)
treec83bcafcdd86bf4907e0dc101544211860b4e955
parentcccced5516b1e744c954500b56181f5e021cd8b5 (diff)
downloadlinux-linaro-8f2d2c660964932bcdf13b2437292ce27a716a38.tar.gz
imx6q: add support for virtual IIM driver
Cherry picked from 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> Signed-off-by: Eric Miao <eric.miao@linaro.org>
-rw-r--r--drivers/char/Kconfig6
-rw-r--r--drivers/char/Makefile2
-rw-r--r--drivers/char/mxs_viim.c175
3 files changed, 183 insertions, 0 deletions
diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
index 43643033a3a..aabc52d4a23 100644
--- a/drivers/char/Kconfig
+++ b/drivers/char/Kconfig
@@ -608,6 +608,12 @@ config RAMOOPS
This enables panic and oops messages to be logged to a circular
buffer in RAM where it can be read back at some later point.
+config MXS_VIIM
+ tristate "MXS Virtual IIM device driver"
+ depends on (ARCH_MX50 || SOC_IMX6Q)
+ help
+ Support for access to MXS Virtual IIM device, most people should say N here.
+
config MSM_SMD_PKT
bool "Enable device interface for some SMD packet ports"
default n
diff --git a/drivers/char/Makefile b/drivers/char/Makefile
index 32762ba769c..338b91abdf9 100644
--- a/drivers/char/Makefile
+++ b/drivers/char/Makefile
@@ -61,6 +61,8 @@ obj-$(CONFIG_TCG_TPM) += tpm/
obj-$(CONFIG_PS3_FLASH) += ps3flash.o
obj-$(CONFIG_RAMOOPS) += ramoops.o
+obj-$(CONFIG_MXS_VIIM) += mxs_viim.o
+
obj-$(CONFIG_JS_RTC) += js-rtc.o
js-rtc-y = rtc.o
diff --git a/drivers/char/mxs_viim.c b/drivers/char/mxs_viim.c
new file mode 100644
index 00000000000..31195b39aa4
--- /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);