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Date: Mon, 21 Oct 2013 17:03:20 -0700
From: Bin Gao <bin.gao@...ux.intel.com>
To: Arnd Bergmann <arnd@...db.de>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] drivers/misc: add rawio framework driver
Rawio provides a framework to read/write registers from a bus, including
pci, i2c, I/O device(memory mapped), etc. based on debug fs.
Rawio bus drivers implement the read/write operation on a specific bus
on top of the rawio framework driver.
They are designed to help device driver and kernel debugging on
embedded systems.
Signed-off-by: Bin Gao <bin.gao@...el.com>
---
drivers/misc/Kconfig | 1 +
drivers/misc/Makefile | 1 +
drivers/misc/rawio/Kconfig | 21 ++
drivers/misc/rawio/Makefile | 1 +
drivers/misc/rawio/rawio.c | 514
++++++++++++++++++++++++++++++++++++++++++++
include/linux/rawio.h | 78 +++++++
6 files changed, 616 insertions(+)
create mode 100644 drivers/misc/rawio/Kconfig
create mode 100644 drivers/misc/rawio/Makefile
create mode 100644 drivers/misc/rawio/rawio.c
create mode 100644 include/linux/rawio.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index 8dacd4c..1afbe4e 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -537,4 +537,5 @@ source "drivers/misc/carma/Kconfig"
source "drivers/misc/altera-stapl/Kconfig"
source "drivers/misc/mei/Kconfig"
source "drivers/misc/vmw_vmci/Kconfig"
+source "drivers/misc/rawio/Kconfig"
endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index c235d5b..3bc116b 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -53,3 +53,4 @@ obj-$(CONFIG_INTEL_MEI) += mei/
obj-$(CONFIG_VMWARE_VMCI) += vmw_vmci/
obj-$(CONFIG_LATTICE_ECP3_CONFIG) += lattice-ecp3-config.o
obj-$(CONFIG_SRAM) += sram.o
+obj-$(CONFIG_RAWIO) += rawio/
diff --git a/drivers/misc/rawio/Kconfig b/drivers/misc/rawio/Kconfig
new file mode 100644
index 0000000..fd4272e
--- /dev/null
+++ b/drivers/misc/rawio/Kconfig
@@ -0,0 +1,21 @@
+#
+# rawio utility drivers
+#
+
+menuconfig RAWIO
+ tristate "Debug fs based raw io device read/write framework "
+ depends on DEBUG_FS
+ default no
+ help
+ This option enables support for reading or writing registers/memory
+ region in a io device via debug fs.
+ With this option and related rawio driver options enabled, you could
+ read configuration space of a PCI device, registers of a memory
+ mapped or port mapped device, registers of a i2c device, etc.
+ This is the just the framework driver. You need enable more
+ options to support specific device types.
+
+ To compile this driver as a module, choose M: the module will
+ be called rawio.
+
+ If you are not sure, say N here.
diff --git a/drivers/misc/rawio/Makefile b/drivers/misc/rawio/Makefile
new file mode 100644
index 0000000..c21453c
--- /dev/null
+++ b/drivers/misc/rawio/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_RAWIO) += rawio.o
diff --git a/drivers/misc/rawio/rawio.c b/drivers/misc/rawio/rawio.c
new file mode 100644
index 0000000..a05b493
--- /dev/null
+++ b/drivers/misc/rawio/rawio.c
@@ -0,0 +1,514 @@
+/*
+ * rawio.c - a debugfs based framework for reading/writing registers
+ * from a I/O device.
+ * With pluggable rawio drivers, it can support PCI devices, I2C devices,
+ * memory mapped I/O devices, etc.
+ * It's designed for helping debug Linux device drivers on embedded
system or
+ * SoC platforms.
+ *
+ * Copyright (c) 2013 Bin Gao <bin.gao@...el.com>
+ *
+ * This file is released under the GPLv2
+ *
+ *
+ * Two files are created in debugfs root folder: rawio_cmd and
rawio_output.
+ * To read or write via the rawio debugfs interface, first echo a rawio
+ * command to the file rawio_cmd, then cat the file rawio_output:
+ * $ echo "<rawio command>" > /sys/kernel/debug/rawio_cmd
+ * $ cat /sys/kernel/debug/rawio_output
+ * The cat command is required for both read and write operations.
+ * For details of rawio command format, see specific rawio drivers.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/debugfs.h>
+#include <linux/err.h>
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/rawio.h>
+
+#define SHOW_NUM_PER_LINE (32 / active_width)
+#define LINE_WIDTH 32
+#define IS_WHITESPACE(c) ((c) == ' ' || (c) == '\t' || (c) == '\n')
+
+static struct dentry *rawio_cmd_dentry, *rawio_output_dentry;
+static char rawio_cmd_buf[RAWIO_CMD_LEN], rawio_err_buf[RAWIO_ERR_LEN + 1];
+static DEFINE_MUTEX(rawio_lock);
+static LIST_HEAD(rawio_driver_head);
+static struct rawio_driver *active_driver;
+static enum width active_width;
+static enum ops active_ops;
+static u64 args_val[RAWIO_ARGS_MAX];
+static u8 args_postfix[RAWIO_ARGS_MAX];
+static int num_args_val;
+
+static void store_value(u64 *where, void *value, enum type type)
+{
+ switch (type) {
+ case TYPE_U8:
+ *(u8 *)where = *(u8 *)value;
+ break;
+ case TYPE_U16:
+ *(u16 *)where = *(u16 *)value;
+ break;
+ case TYPE_U32:
+ *(u32 *)where = *(u32 *)value;
+ break;
+ case TYPE_U64:
+ *where = *(u64 *)value;
+ break;
+ case TYPE_S8:
+ *(s8 *)where = *(s8 *)value;
+ break;
+ case TYPE_S16:
+ *(s16 *)where = *(s16 *)value;
+ break;
+ case TYPE_S32:
+ *(s32 *)where = *(s32 *)value;
+ break;
+ case TYPE_S64:
+ *(s64 *)where = *(s64 *)value;
+ break;
+ default:
+ break;
+ }
+}
+
+int rawio_register_driver(struct rawio_driver *driver)
+{
+ mutex_lock(&rawio_lock);
+ list_add_tail(&driver->list, &rawio_driver_head);
+ mutex_unlock(&rawio_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rawio_register_driver);
+
+int rawio_unregister_driver(struct rawio_driver *driver)
+{
+ mutex_lock(&rawio_lock);
+ list_del(&driver->list);
+ mutex_unlock(&rawio_lock);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rawio_unregister_driver);
+
+void rawio_err(const char *fmt, ...)
+{
+ va_list args;
+ va_start(args, fmt);
+ vsnprintf(rawio_err_buf, RAWIO_ERR_LEN, fmt, args);
+ va_end(args);
+}
+EXPORT_SYMBOL_GPL(rawio_err);
+
+static int parse_arguments(char *input, char **args)
+{
+ int count, located;
+ char *p = input;
+ int input_len = strlen(input);
+
+ count = 0;
+ located = 0;
+ while (*p != 0) {
+ if (p - input >= input_len)
+ break;
+
+ /* Locate the first character of a argument */
+ if (!IS_WHITESPACE(*p)) {
+ if (!located) {
+ located = 1;
+ args[count++] = p;
+ if (count > RAWIO_ARGS_MAX)
+ break;
+ }
+ } else {
+ if (located) {
+ *p = 0;
+ located = 0;
+ }
+ }
+ p++;
+ }
+
+ return count;
+}
+
+static int parse_driver_args(struct rawio_driver *driver, char **arg_list,
+ int num_args, enum ops ops, u64 *arg_val, u8 *postfix)
+{
+ int i;
+ size_t str_len;
+ enum type type;
+ u64 value;
+ char *str;
+ char *args_postfix;
+
+ for (i = 0; i < num_args; i++) {
+ switch (ops) {
+ case OPS_RD:
+ type = driver->args_rd_types[i];
+ args_postfix = driver->args_rd_postfix;
+ break;
+ case OPS_WR:
+ type = driver->args_wr_types[i];
+ args_postfix = driver->args_wr_postfix;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (args_postfix[i]) {
+ str = (char *) arg_list[i];
+ str_len = strlen(str);
+ if (str[str_len - 1] == args_postfix[i]) {
+ postfix[i] = 1;
+ str[str_len - 1] = 0;
+ } else {
+ postfix[i] = 0;
+ }
+ }
+
+ if (kstrtou64(arg_list[i], 0, &value))
+ goto failed;
+ store_value(arg_val + i, &value, type);
+ }
+
+ return 0;
+
+failed:
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "invalid argument %s, usage:\n", arg_list[i]);
+ strncat(rawio_err_buf, driver->help, RAWIO_ERR_LEN -
+ strlen(rawio_err_buf));
+ return -EINVAL;
+}
+
+static struct rawio_driver *find_driver(const char *name)
+{
+ struct rawio_driver *driver;
+
+ mutex_lock(&rawio_lock);
+ list_for_each_entry(driver, &rawio_driver_head, list) {
+ if (!strncmp(driver->name, name, strlen(name))) {
+ mutex_unlock(&rawio_lock);
+ return driver;
+ }
+ }
+ mutex_unlock(&rawio_lock);
+
+ return NULL;
+}
+
+static ssize_t rawio_cmd_write(struct file *file, const char __user *buf,
+ size_t len, loff_t *offset)
+{
+ char cmd[RAWIO_CMD_LEN];
+ char *arg_list[RAWIO_ARGS_MAX];
+ int num_args;
+ enum ops ops;
+ enum width width;
+ struct rawio_driver *driver;
+
+ rawio_err_buf[0] = 0;
+
+ if (len >= RAWIO_CMD_LEN) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN, "command is too long.\n"
+ "max allowed command length is %d\n",
+ RAWIO_CMD_LEN);
+ goto done;
+ }
+
+ if (copy_from_user(cmd, buf, len)) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "copy_from_user() failed.\n");
+ goto done;
+ }
+ cmd[len] = 0;
+
+ rawio_cmd_buf[0] = 0;
+ strncpy(rawio_cmd_buf, cmd, len);
+ rawio_cmd_buf[len] = 0;
+
+ num_args = parse_arguments(cmd, arg_list);
+ if (num_args < RAWIO_ARGS_MIN) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "invalid command(too few arguments)\n");
+ goto done;
+ }
+ if (num_args > RAWIO_ARGS_MAX) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "invalid command(too many arguments)\n");
+ goto done;
+ }
+
+ /* arg 0: ops(read/write) and width (8/16/32/64 bit) */
+ if (arg_list[0][0] == 'r')
+ ops = OPS_RD;
+ else if (arg_list[0][0] == 'w')
+ ops = OPS_WR;
+ else {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "invalid operation: %c, only r and w are supported\n",
+ arg_list[0][0]);
+ goto done;
+ }
+
+ if (strlen(arg_list[0]) >= 3) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "invalid bus width: %s, only 1 2 4 8 are supported\n",
+ arg_list[0] + 1);
+ goto done;
+ }
+
+ if (strlen(arg_list[0]) == 1)
+ width = WIDTH_DEFAULT;
+ else {
+ switch (arg_list[0][1]) {
+ case '1':
+ width = WIDTH_1;
+ break;
+ case '2':
+ width = WIDTH_2;
+ break;
+ case '4':
+ width = WIDTH_4;
+ break;
+ case '8':
+ width = WIDTH_8;
+ break;
+ default:
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "invalid bus width: %c, only 1 2 4 8 are supported\n",
+ arg_list[0][1]);
+ goto done;
+ }
+ }
+
+ /* arg1: driver name */
+ driver = find_driver(arg_list[1]);
+ if (!driver) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "unsupported driver type: %s\n", arg_list[1]);
+ goto done;
+ }
+
+ if (width == WIDTH_DEFAULT)
+ width = driver->default_width;
+
+ if (!(width & driver->supported_width)) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "unsupported driver width: %s\n", arg_list[0]);
+ goto done;
+ }
+
+ /* arg2, ..., argn: driver specific arguments */
+ num_args = num_args - 2;
+ if (((ops == OPS_RD) && (num_args > driver->args_rd_max_num)) ||
+ ((ops == OPS_WR) && (num_args > driver->args_wr_max_num))) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "too many arguments, usage:\n");
+ strncat(rawio_err_buf, driver->help, RAWIO_ERR_LEN -
+ strlen(rawio_err_buf));
+ goto done;
+ }
+ if (((ops == OPS_RD) && (num_args < driver->args_rd_min_num)) ||
+ ((ops == OPS_WR) && (num_args < driver->args_wr_min_num))) {
+ snprintf(rawio_err_buf, RAWIO_ERR_LEN,
+ "too few arguments, usage:\n");
+ strncat(rawio_err_buf, driver->help, RAWIO_ERR_LEN -
+ strlen(rawio_err_buf));
+ goto done;
+ }
+
+ if (parse_driver_args(driver, arg_list + 2, num_args, ops,
+ args_val, args_postfix))
+ goto done;
+
+ active_driver = driver;
+ active_width = width;
+ active_ops = ops;
+ num_args_val = num_args;
+done:
+ return len;
+}
+
+static int rawio_output_show(struct seq_file *s, void *unused)
+{
+ u32 start, end, start_nature, end_nature;
+ int ret, i, comp1, comp2, output_len;
+ void *output;
+ char seq_buf[16];
+
+ mutex_lock(&rawio_lock);
+
+ if (strlen(rawio_err_buf) > 0) {
+ seq_puts(s, rawio_err_buf);
+ mutex_unlock(&rawio_lock);
+ return 0;
+ }
+
+ active_driver->s = s;
+
+ if (active_ops == OPS_WR) {
+ ret = active_driver->ops->write(active_driver, active_width,
+ args_val, args_postfix, num_args_val);
+ if (ret)
+ seq_puts(s, rawio_err_buf);
+ else
+ seq_puts(s, "write succeeded.\n");
+
+ mutex_unlock(&rawio_lock);
+ return 0;
+ }
+
+ if (active_driver->ops->read_and_show) {
+ ret = active_driver->ops->read_and_show(active_driver,
+ active_width, args_val, args_postfix, num_args_val);
+ if (ret)
+ seq_puts(s, rawio_err_buf);
+ mutex_unlock(&rawio_lock);
+ return 0;
+ }
+
+ ret = active_driver->ops->read(active_driver, active_width, args_val,
+ args_postfix, num_args_val, &output, &output_len);
+ if (ret) {
+ seq_puts(s, rawio_err_buf);
+ mutex_unlock(&rawio_lock);
+ return 0;
+ }
+
+ start_nature = (u32)args_val[active_driver->addr_pos];
+ start = (start_nature / LINE_WIDTH) * LINE_WIDTH;
+ end_nature = start_nature + (output_len - 1) * active_width;
+ end = (end_nature / LINE_WIDTH + 1) * LINE_WIDTH - active_width;
+ comp1 = (start_nature - start) / active_width;
+ comp2 = (end - end_nature) / active_width;
+
+ mutex_unlock(&rawio_lock);
+
+ for (i = 0; i < comp1 + comp2 + output_len; i++) {
+ if ((i % SHOW_NUM_PER_LINE) == 0) {
+ snprintf(seq_buf, sizeof(seq_buf), "[%08x]",
+ (u32)start + i * 4);
+ seq_puts(s, seq_buf);
+ }
+ if (i < comp1 || i >= output_len + comp1) {
+ switch (active_width) {
+ case WIDTH_8:
+ seq_puts(s, " ****************");
+ break;
+ case WIDTH_4:
+ seq_puts(s, " ********");
+ break;
+ case WIDTH_2:
+ seq_puts(s, " ****");
+ break;
+ case WIDTH_1:
+ seq_puts(s, " **");
+ break;
+ default:
+ break;
+ }
+ } else {
+ switch (active_width) {
+ case WIDTH_8:
+ snprintf(seq_buf, sizeof(seq_buf), "[%016llx]",
+ *((u64 *)output + i - comp1));
+ seq_puts(s, seq_buf);
+ break;
+ case WIDTH_4:
+ snprintf(seq_buf, sizeof(seq_buf), " %08x",
+ *((u32 *)output + i - comp1));
+ seq_puts(s, seq_buf);
+ break;
+ case WIDTH_2:
+ snprintf(seq_buf, sizeof(seq_buf), " %04x",
+ *((u16 *)output + i - comp1));
+ seq_puts(s, seq_buf);
+ break;
+ case WIDTH_1:
+ snprintf(seq_buf, sizeof(seq_buf), " %02x",
+ *((u8 *)output + i - comp1));
+ seq_puts(s, seq_buf);
+ break;
+ default:
+ break;
+ }
+ }
+
+ if ((i + 1) % SHOW_NUM_PER_LINE == 0)
+ seq_puts(s, "\n");
+ }
+
+ kfree(output);
+ return 0;
+}
+
+static int rawio_cmd_show(struct seq_file *s, void *unused)
+{
+ seq_puts(s, rawio_cmd_buf);
+ return 0;
+}
+
+static int rawio_cmd_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, rawio_cmd_show, NULL);
+}
+
+static const struct file_operations rawio_cmd_fops = {
+ .owner = THIS_MODULE,
+ .open = rawio_cmd_open,
+ .read = seq_read,
+ .write = rawio_cmd_write,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int rawio_output_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, rawio_output_show, NULL);
+}
+
+static const struct file_operations rawio_output_fops = {
+ .owner = THIS_MODULE,
+ .open = rawio_output_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static int __init rawio_init(void)
+{
+ rawio_cmd_dentry = debugfs_create_file("rawio_cmd",
+ S_IFREG | S_IRUGO | S_IWUSR, NULL, NULL, &rawio_cmd_fops);
+ rawio_output_dentry = debugfs_create_file("rawio_output",
+ S_IFREG | S_IRUGO, NULL, NULL, &rawio_output_fops);
+ if (!rawio_cmd_dentry || !rawio_output_dentry) {
+ pr_err("rawio: can't create debugfs node\n");
+ return -EFAULT;
+ }
+
+ return 0;
+}
+module_init(rawio_init);
+
+static void __exit rawio_exit(void)
+{
+ debugfs_remove(rawio_cmd_dentry);
+ debugfs_remove(rawio_output_dentry);
+}
+module_exit(rawio_exit);
+
+MODULE_DESCRIPTION("Raw IO read/write utility framework driver");
+MODULE_VERSION("1.0");
+MODULE_AUTHOR("Bin Gao <bin.gao@...el.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/rawio.h b/include/linux/rawio.h
new file mode 100644
index 0000000..8f62851
--- /dev/null
+++ b/include/linux/rawio.h
@@ -0,0 +1,78 @@
+#ifndef RAWIO_H
+#define RAWIO_H
+
+#define RAWIO_DRVNAME_LEN 8
+#define RAWIO_ERR_LEN 256
+#define RAWIO_CMD_LEN 96
+#define RAWIO_HELP_LEN 128
+#define RAWIO_ARGS_MIN 3
+#define RAWIO_ARGS_MAX 10
+
+enum type {
+ TYPE_STR = 0,
+ TYPE_U8,
+ TYPE_U16,
+ TYPE_U32,
+ TYPE_U64,
+ TYPE_S8,
+ TYPE_S16,
+ TYPE_S32,
+ TYPE_S64,
+};
+
+/* read/write width: 1, 2, 4 or 8 bytes */
+enum width {
+ WIDTH_DEFAULT = 0,
+ WIDTH_1 = 1,
+ WIDTH_2 = 2,
+ WIDTH_4 = 4,
+ WIDTH_8 = 8,
+};
+
+enum ops {
+ OPS_RD = 1, /* read */
+ OPS_WR, /* write */
+};
+
+struct rawio_driver {
+ struct list_head list;
+ char name[RAWIO_DRVNAME_LEN];
+
+ int args_rd_max_num; /* max args for read(including optional args) */
+ enum type args_rd_types[RAWIO_ARGS_MAX]; /* type of each arg */
+ int args_rd_min_num; /* min args for read */
+ char args_rd_postfix[RAWIO_ARGS_MAX]; /* read args postfix */
+
+ int args_wr_max_num; /* max args for write(including optional args) */
+ enum type args_wr_types[RAWIO_ARGS_MAX]; /* type of each arg */
+ int args_wr_min_num; /* min args for write */
+ char args_wr_postfix[RAWIO_ARGS_MAX]; /* write args postfix */
+
+ /* index of argument that specifies the register or memory address */
+ int addr_pos;
+
+ unsigned int supported_width;
+ enum width default_width;
+ char help[RAWIO_HELP_LEN];
+ struct rawio_ops *ops;
+ struct seq_file *s;
+};
+
+struct rawio_ops {
+ /* driver reads io device and returns the data to framework */
+ int (*read) (struct rawio_driver *drv, int width,
+ u64 *input, u8 *postfix, int input_num,
+ void **output, int *output_num);
+ /* driver reads io device and shows the data */
+ int (*read_and_show) (struct rawio_driver *drv, int width,
+ u64 *input, u8 *postfix, int input_num);
+ /* driver writes data passed from framework to io device */
+ int (*write) (struct rawio_driver *driver, int width,
+ u64 *input, u8 *postfix, int input_num);
+};
+
+int rawio_register_driver(struct rawio_driver *drv);
+int rawio_unregister_driver(struct rawio_driver *drv);
+void rawio_err(const char *fmt, ...);
+
+#endif
--
1.8.1.2
--
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