1 files changed, 121 insertions, 0 deletions
diff --git a/fs/proc/sprd_debug/sprd_uboot_log_dump.c b/fs/proc/sprd_debug/sprd_uboot_log_dump.c
new file mode 100644
index 00000000..b195bdf7
--- /dev/null
+++ b/fs/proc/sprd_debug/sprd_uboot_log_dump.c
@@ -0,0 +1,121 @@
+/*
+ * Copyright (C) 2015 Spreadtrum Communications Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/memblock.h>
+#include <linux/io.h>
+#include <linux/proc_fs.h>
+
+#define PROC_DUMP_PARENT "bootloader"
+#define PROC_DUMP	 "log_buf"
+
+static unsigned int log_start = ~0x1;
+static unsigned int log_size  = ~0x1;
+
+static int __init set_ram_range(char *str)
+{
+
+	if (get_option(&str, &log_start) == 2)
+		get_option(&str, &log_size);
+
+	return 1;
+}
+
+__setup("boot_ram_log=", set_ram_range);
+
+static int log_buf_open(struct inode *inode, struct file *filp)
+{
+	void  *base;
+
+	/* determine the ram area is valid or not. */
+	if (!valid_phys_addr_range(log_start, log_size)
+	    || !memblock_is_region_reserved(log_start, log_size)) {
+		pr_err("%s: check memory range failed!\n", __func__);
+
+		return -EINVAL;
+	}
+
+	base = ioremap(log_start, log_size);
+	filp->private_data = base;
+	if (!base) {
+		pr_err("%s: remap error!\n", __func__);
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+static int log_buf_release(struct inode *inode, struct file *filp)
+{
+	void *base = filp->private_data;
+
+	if (base)
+		iounmap(base);
+
+	return 0;
+}
+
+
+static ssize_t log_buf_read(struct file *filp, char __user *buffer,
+			size_t len, loff_t *offset)
+{
+	void  *base = filp->private_data;
+
+	if (!base)
+		return -ENOMEM;
+
+	return simple_read_from_buffer(buffer, len, offset, base, log_size);
+}
+
+
+static int log_buf_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+
+	return vm_iomap_memory(vma, log_start, log_size);
+}
+
+
+static const struct file_operations log_buf_fops = {
+	.owner	 = THIS_MODULE,
+	.read	 = log_buf_read,
+	.open	 = log_buf_open,
+	.mmap	 = log_buf_mmap,
+	.release = log_buf_release,
+};
+
+
+static int __init uboot_log_dump(void)
+{
+	int err;
+	struct proc_dir_entry *entry_parent, *entry_dump;
+
+	entry_parent = proc_mkdir("bootloader", NULL);
+	if (!entry_parent) {
+		pr_err("u-boot log dump: create proc file failed\n");
+		return -ENOMEM;
+	}
+
+	/* other user is NOT permitted to dump buffer */
+	entry_dump = proc_create_data(PROC_DUMP, S_IRUSR, entry_parent,
+			&log_buf_fops, NULL);
+
+	err = entry_dump ? 0 : -ENOMEM;
+
+	return err;
+}
+
+module_init(uboot_log_dump);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Spreadtrum U-boot log dump support");