--- /dev/null
+/*
+ * dell_rbu.c
+ * Bios Update driver for Dell systems
+ * Author: Dell Inc
+ * Abhay Salunke <abhay_salunke@dell.com>
+ *
+ * Copyright (C) 2005 Dell Inc.
+ *
+ * Remote BIOS Update (rbu) driver is used for updating DELL BIOS by
+ * creating entries in the /sys file systems on Linux 2.6 and higher
+ * kernels. The driver supports two mechanism to update the BIOS namely
+ * contiguous and packetized. Both these methods still require having some
+ * application to set the CMOS bit indicating the BIOS to update itself
+ * after a reboot.
+ *
+ * Contiguous method:
+ * This driver writes the incoming data in a monolithic image by allocating
+ * contiguous physical pages large enough to accommodate the incoming BIOS
+ * image size.
+ *
+ * Packetized method:
+ * The driver writes the incoming packet image by allocating a new packet
+ * on every time the packet data is written. This driver requires an
+ * application to break the BIOS image in to fixed sized packet chunks.
+ *
+ * See Documentation/dell_rbu.txt for more info.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License v2.0 as published by
+ * the Free Software Foundation
+ *
+ * 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/version.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/blkdev.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/moduleparam.h>
+#include <linux/firmware.h>
+#include <linux/dma-mapping.h>
+
+MODULE_AUTHOR("Abhay Salunke <abhay_salunke@dell.com>");
+MODULE_DESCRIPTION("Driver for updating BIOS image on DELL systems");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("1.0");
+
+#define BIOS_SCAN_LIMIT 0xffffffff
+#define MAX_IMAGE_LENGTH 16
+static struct _rbu_data {
+ void *image_update_buffer;
+ unsigned long image_update_buffer_size;
+ unsigned long bios_image_size;
+ int image_update_ordernum;
+ int dma_alloc;
+ spinlock_t lock;
+ unsigned long packet_read_count;
+ unsigned long packet_write_count;
+ unsigned long num_packets;
+ unsigned long packetsize;
+} rbu_data;
+
+static char image_type[MAX_IMAGE_LENGTH] = "mono";
+module_param_string(image_type, image_type, sizeof(image_type), 0);
+MODULE_PARM_DESC(image_type, "BIOS image type. choose- mono or packet");
+
+struct packet_data {
+ struct list_head list;
+ size_t length;
+ void *data;
+ int ordernum;
+};
+
+static struct packet_data packet_data_head;
+
+static struct platform_device *rbu_device;
+static int context;
+static dma_addr_t dell_rbu_dmaaddr;
+
+static void init_packet_head(void)
+{
+ INIT_LIST_HEAD(&packet_data_head.list);
+ rbu_data.packet_write_count = 0;
+ rbu_data.packet_read_count = 0;
+ rbu_data.num_packets = 0;
+ rbu_data.packetsize = 0;
+}
+
+static int fill_last_packet(void *data, size_t length)
+{
+ struct list_head *ptemp_list;
+ struct packet_data *packet = NULL;
+ int packet_count = 0;
+
+ pr_debug("fill_last_packet: entry \n");
+
+ if (!rbu_data.num_packets) {
+ pr_debug("fill_last_packet: num_packets=0\n");
+ return -ENOMEM;
+ }
+
+ packet_count = rbu_data.num_packets;
+
+ ptemp_list = (&packet_data_head.list)->prev;
+
+ packet = list_entry(ptemp_list, struct packet_data, list);
+
+ if ((rbu_data.packet_write_count + length) > rbu_data.packetsize) {
+ pr_debug("dell_rbu:%s: packet size data "
+ "overrun\n", __FUNCTION__);
+ return -EINVAL;
+ }
+
+ pr_debug("fill_last_packet : buffer = %p\n", packet->data);
+
+ memcpy((packet->data + rbu_data.packet_write_count), data, length);
+
+ if ((rbu_data.packet_write_count + length) == rbu_data.packetsize) {
+ /*
+ * this was the last data chunk in the packet
+ * so reinitialize the packet data counter to zero
+ */
+ rbu_data.packet_write_count = 0;
+ } else
+ rbu_data.packet_write_count += length;
+
+ pr_debug("fill_last_packet: exit \n");
+ return 0;
+}
+
+static int create_packet(size_t length)
+{
+ struct packet_data *newpacket;
+ int ordernum = 0;
+
+ pr_debug("create_packet: entry \n");
+
+ if (!rbu_data.packetsize) {
+ pr_debug("create_packet: packetsize not specified\n");
+ return -EINVAL;
+ }
+
+ newpacket = kmalloc(sizeof(struct packet_data), GFP_KERNEL);
+ if (!newpacket) {
+ printk(KERN_WARNING
+ "dell_rbu:%s: failed to allocate new "
+ "packet\n", __FUNCTION__);
+ return -ENOMEM;
+ }
+
+ ordernum = get_order(length);
+ /*
+ * there is no upper limit on memory
+ * address for packetized mechanism
+ */
+ newpacket->data = (unsigned char *)__get_free_pages(GFP_KERNEL,
+ ordernum);
+
+ pr_debug("create_packet: newpacket %p\n", newpacket->data);
+
+ if (!newpacket->data) {
+ printk(KERN_WARNING
+ "dell_rbu:%s: failed to allocate new "
+ "packet\n", __FUNCTION__);
+ kfree(newpacket);
+ return -ENOMEM;
+ }
+
+ newpacket->ordernum = ordernum;
+ ++rbu_data.num_packets;
+ /*
+ * initialize the newly created packet headers
+ */
+ INIT_LIST_HEAD(&newpacket->list);
+ list_add_tail(&newpacket->list, &packet_data_head.list);
+ /*
+ * packets have fixed size
+ */
+ newpacket->length = rbu_data.packetsize;
+
+ pr_debug("create_packet: exit \n");
+
+ return 0;
+}
+
+static int packetize_data(void *data, size_t length)
+{
+ int rc = 0;
+
+ if (!rbu_data.packet_write_count) {
+ if ((rc = create_packet(length)))
+ return rc;
+ }
+ if ((rc = fill_last_packet(data, length)))
+ return rc;
+
+ return rc;
+}
+
+static int
+do_packet_read(char *data, struct list_head *ptemp_list,
+ int length, int bytes_read, int *list_read_count)
+{
+ void *ptemp_buf;
+ struct packet_data *newpacket = NULL;
+ int bytes_copied = 0;
+ int j = 0;
+
+ newpacket = list_entry(ptemp_list, struct packet_data, list);
+ *list_read_count += newpacket->length;
+
+ if (*list_read_count > bytes_read) {
+ /* point to the start of unread data */
+ j = newpacket->length - (*list_read_count - bytes_read);
+ /* point to the offset in the packet buffer */
+ ptemp_buf = (u8 *) newpacket->data + j;
+ /*
+ * check if there is enough room in
+ * * the incoming buffer
+ */
+ if (length > (*list_read_count - bytes_read))
+ /*
+ * copy what ever is there in this
+ * packet and move on
+ */
+ bytes_copied = (*list_read_count - bytes_read);
+ else
+ /* copy the remaining */
+ bytes_copied = length;
+ memcpy(data, ptemp_buf, bytes_copied);
+ }
+ return bytes_copied;
+}
+
+static int packet_read_list(char *data, size_t * pread_length)
+{
+ struct list_head *ptemp_list;
+ int temp_count = 0;
+ int bytes_copied = 0;
+ int bytes_read = 0;
+ int remaining_bytes = 0;
+ char *pdest = data;
+
+ /* check if we have any packets */
+ if (0 == rbu_data.num_packets)
+ return -ENOMEM;
+
+ remaining_bytes = *pread_length;
+ bytes_read = rbu_data.packet_read_count;
+
+ ptemp_list = (&packet_data_head.list)->next;
+ while (!list_empty(ptemp_list)) {
+ bytes_copied = do_packet_read(pdest, ptemp_list,
+ remaining_bytes, bytes_read,
+ &temp_count);
+ remaining_bytes -= bytes_copied;
+ bytes_read += bytes_copied;
+ pdest += bytes_copied;
+ /*
+ * check if we reached end of buffer before reaching the
+ * last packet
+ */
+ if (remaining_bytes == 0)
+ break;
+
+ ptemp_list = ptemp_list->next;
+ }
+ /*finally set the bytes read */
+ *pread_length = bytes_read - rbu_data.packet_read_count;
+ rbu_data.packet_read_count = bytes_read;
+ return 0;
+}
+
+static void packet_empty_list(void)
+{
+ struct list_head *ptemp_list;
+ struct list_head *pnext_list;
+ struct packet_data *newpacket;
+
+ ptemp_list = (&packet_data_head.list)->next;
+ while (!list_empty(ptemp_list)) {
+ newpacket =
+ list_entry(ptemp_list, struct packet_data, list);
+ pnext_list = ptemp_list->next;
+ list_del(ptemp_list);
+ ptemp_list = pnext_list;
+ /*
+ * zero out the RBU packet memory before freeing
+ * to make sure there are no stale RBU packets left in memory
+ */
+ memset(newpacket->data, 0, rbu_data.packetsize);
+ free_pages((unsigned long)newpacket->data,
+ newpacket->ordernum);
+ kfree(newpacket);
+ }
+ rbu_data.packet_write_count = 0;
+ rbu_data.packet_read_count = 0;
+ rbu_data.num_packets = 0;
+ rbu_data.packetsize = 0;
+}
+
+/*
+ * img_update_free: Frees the buffer allocated for storing BIOS image
+ * Always called with lock held and returned with lock held
+ */
+static void img_update_free(void)
+{
+ if (!rbu_data.image_update_buffer)
+ return;
+ /*
+ * zero out this buffer before freeing it to get rid of any stale
+ * BIOS image copied in memory.
+ */
+ memset(rbu_data.image_update_buffer, 0,
+ rbu_data.image_update_buffer_size);
+ if (rbu_data.dma_alloc == 1)
+ dma_free_coherent(NULL, rbu_data.bios_image_size,
+ rbu_data.image_update_buffer,
+ dell_rbu_dmaaddr);
+ else
+ free_pages((unsigned long)rbu_data.image_update_buffer,
+ rbu_data.image_update_ordernum);
+
+ /*
+ * Re-initialize the rbu_data variables after a free
+ */
+ rbu_data.image_update_ordernum = -1;
+ rbu_data.image_update_buffer = NULL;
+ rbu_data.image_update_buffer_size = 0;
+ rbu_data.bios_image_size = 0;
+ rbu_data.dma_alloc = 0;
+}
+
+/*
+ * img_update_realloc: This function allocates the contiguous pages to
+ * accommodate the requested size of data. The memory address and size
+ * values are stored globally and on every call to this function the new
+ * size is checked to see if more data is required than the existing size.
+ * If true the previous memory is freed and new allocation is done to
+ * accommodate the new size. If the incoming size is less then than the
+ * already allocated size, then that memory is reused. This function is
+ * called with lock held and returns with lock held.
+ */
+static int img_update_realloc(unsigned long size)
+{
+ unsigned char *image_update_buffer = NULL;
+ unsigned long rc;
+ unsigned long img_buf_phys_addr;
+ int ordernum;
+ int dma_alloc = 0;
+
+ /*
+ * check if the buffer of sufficient size has been
+ * already allocated
+ */
+ if (rbu_data.image_update_buffer_size >= size) {
+ /*
+ * check for corruption
+ */
+ if ((size != 0) && (rbu_data.image_update_buffer == NULL)) {
+ printk(KERN_ERR "dell_rbu:%s: corruption "
+ "check failed\n", __FUNCTION__);
+ return -EINVAL;
+ }
+ /*
+ * we have a valid pre-allocated buffer with
+ * sufficient size
+ */
+ return 0;
+ }
+
+ /*
+ * free any previously allocated buffer
+ */
+ img_update_free();
+
+ spin_unlock(&rbu_data.lock);
+
+ ordernum = get_order(size);
+ image_update_buffer =
+ (unsigned char *)__get_free_pages(GFP_KERNEL, ordernum);
+
+ img_buf_phys_addr =
+ (unsigned long)virt_to_phys(image_update_buffer);
+
+ if (img_buf_phys_addr > BIOS_SCAN_LIMIT) {
+ free_pages((unsigned long)image_update_buffer, ordernum);
+ ordernum = -1;
+ image_update_buffer = dma_alloc_coherent(NULL, size,
+ &dell_rbu_dmaaddr,
+ GFP_KERNEL);
+ dma_alloc = 1;
+ }
+
+ spin_lock(&rbu_data.lock);
+
+ if (image_update_buffer != NULL) {
+ rbu_data.image_update_buffer = image_update_buffer;
+ rbu_data.image_update_buffer_size = size;
+ rbu_data.bios_image_size =
+ rbu_data.image_update_buffer_size;
+ rbu_data.image_update_ordernum = ordernum;
+ rbu_data.dma_alloc = dma_alloc;
+ rc = 0;
+ } else {
+ pr_debug("Not enough memory for image update:"
+ "size = %ld\n", size);
+ rc = -ENOMEM;
+ }
+
+ return rc;
+}
+
+static ssize_t read_packet_data(char *buffer, loff_t pos, size_t count)
+{
+ int retval;
+ size_t bytes_left;
+ size_t data_length;
+ char *ptempBuf = buffer;
+ unsigned long imagesize;
+
+ /* check to see if we have something to return */
+ if (rbu_data.num_packets == 0) {
+ pr_debug("read_packet_data: no packets written\n");
+ retval = -ENOMEM;
+ goto read_rbu_data_exit;
+ }
+
+ imagesize = rbu_data.num_packets * rbu_data.packetsize;
+
+ if (pos > imagesize) {
+ retval = 0;
+ printk(KERN_WARNING "dell_rbu:read_packet_data: "
+ "data underrun\n");
+ goto read_rbu_data_exit;
+ }
+
+ bytes_left = imagesize - pos;
+ data_length = min(bytes_left, count);
+
+ if ((retval = packet_read_list(ptempBuf, &data_length)) < 0)
+ goto read_rbu_data_exit;
+
+ if ((pos + count) > imagesize) {
+ rbu_data.packet_read_count = 0;
+ /* this was the last copy */
+ retval = bytes_left;
+ } else
+ retval = count;
+
+ read_rbu_data_exit:
+ return retval;
+}
+
+static ssize_t read_rbu_mono_data(char *buffer, loff_t pos, size_t count)
+{
+ unsigned char *ptemp = NULL;
+ size_t bytes_left = 0;
+ size_t data_length = 0;
+ ssize_t ret_count = 0;
+
+ /* check to see if we have something to return */
+ if ((rbu_data.image_update_buffer == NULL) ||
+ (rbu_data.bios_image_size == 0)) {
+ pr_debug("read_rbu_data_mono: image_update_buffer %p ,"
+ "bios_image_size %lu\n",
+ rbu_data.image_update_buffer,
+ rbu_data.bios_image_size);
+ ret_count = -ENOMEM;
+ goto read_rbu_data_exit;
+ }
+
+ if (pos > rbu_data.bios_image_size) {
+ ret_count = 0;
+ goto read_rbu_data_exit;
+ }
+
+ bytes_left = rbu_data.bios_image_size - pos;
+ data_length = min(bytes_left, count);
+
+ ptemp = rbu_data.image_update_buffer;
+ memcpy(buffer, (ptemp + pos), data_length);
+
+ if ((pos + count) > rbu_data.bios_image_size)
+ /* this was the last copy */
+ ret_count = bytes_left;
+ else
+ ret_count = count;
+ read_rbu_data_exit:
+ return ret_count;
+}
+
+static ssize_t
+read_rbu_data(struct kobject *kobj, char *buffer, loff_t pos, size_t count)
+{
+ ssize_t ret_count = 0;
+
+ spin_lock(&rbu_data.lock);
+
+ if (!strcmp(image_type, "mono"))
+ ret_count = read_rbu_mono_data(buffer, pos, count);
+ else if (!strcmp(image_type, "packet"))
+ ret_count = read_packet_data(buffer, pos, count);
+ else
+ pr_debug("read_rbu_data: invalid image type specified\n");
+
+ spin_unlock(&rbu_data.lock);
+ return ret_count;
+}
+
+static ssize_t
+read_rbu_image_type(struct kobject *kobj, char *buffer, loff_t pos,
+ size_t count)
+{
+ int size = 0;
+ if (!pos)
+ size = sprintf(buffer, "%s\n", image_type);
+ return size;
+}
+
+static ssize_t
+write_rbu_image_type(struct kobject *kobj, char *buffer, loff_t pos,
+ size_t count)
+{
+ int rc = count;
+ spin_lock(&rbu_data.lock);
+
+ if (strlen(buffer) < MAX_IMAGE_LENGTH)
+ sscanf(buffer, "%s", image_type);
+ else
+ printk(KERN_WARNING "dell_rbu: image_type is invalid"
+ "max chars = %d, \n incoming str--%s-- \n",
+ MAX_IMAGE_LENGTH, buffer);
+
+ /* we must free all previous allocations */
+ packet_empty_list();
+ img_update_free();
+
+ spin_unlock(&rbu_data.lock);
+ return rc;
+
+}
+
+static struct bin_attribute rbu_data_attr = {
+ .attr = {.name = "data",.owner = THIS_MODULE,.mode = 0444},
+ .read = read_rbu_data,
+};
+
+static struct bin_attribute rbu_image_type_attr = {
+ .attr = {.name = "image_type",.owner = THIS_MODULE,.mode = 0644},
+ .read = read_rbu_image_type,
+ .write = write_rbu_image_type,
+};
+
+static void callbackfn_rbu(const struct firmware *fw, void *context)
+{
+ int rc = 0;
+
+ if (!fw || !fw->size)
+ return;
+
+ spin_lock(&rbu_data.lock);
+ if (!strcmp(image_type, "mono")) {
+ if (!img_update_realloc(fw->size))
+ memcpy(rbu_data.image_update_buffer,
+ fw->data, fw->size);
+ } else if (!strcmp(image_type, "packet")) {
+ if (!rbu_data.packetsize)
+ rbu_data.packetsize = fw->size;
+ else if (rbu_data.packetsize != fw->size) {
+ packet_empty_list();
+ rbu_data.packetsize = fw->size;
+ }
+ packetize_data(fw->data, fw->size);
+ } else
+ pr_debug("invalid image type specified.\n");
+ spin_unlock(&rbu_data.lock);
+
+ rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
+ "dell_rbu", &rbu_device->dev,
+ &context, callbackfn_rbu);
+ if (rc)
+ printk(KERN_ERR
+ "dell_rbu:%s request_firmware_nowait failed"
+ " %d\n", __FUNCTION__, rc);
+}
+
+static int __init dcdrbu_init(void)
+{
+ int rc = 0;
+ spin_lock_init(&rbu_data.lock);
+
+ init_packet_head();
+ rbu_device =
+ platform_device_register_simple("dell_rbu", -1, NULL, 0);
+ if (!rbu_device) {
+ printk(KERN_ERR
+ "dell_rbu:%s:platform_device_register_simple "
+ "failed\n", __FUNCTION__);
+ return -EIO;
+ }
+
+ sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_data_attr);
+ sysfs_create_bin_file(&rbu_device->dev.kobj, &rbu_image_type_attr);
+
+ rc = request_firmware_nowait(THIS_MODULE, FW_ACTION_NOHOTPLUG,
+ "dell_rbu", &rbu_device->dev,
+ &context, callbackfn_rbu);
+ if (rc)
+ printk(KERN_ERR "dell_rbu:%s:request_firmware_nowait"
+ " failed %d\n", __FUNCTION__, rc);
+
+ return rc;
+
+}
+
+static __exit void dcdrbu_exit(void)
+{
+ spin_lock(&rbu_data.lock);
+ packet_empty_list();
+ img_update_free();
+ spin_unlock(&rbu_data.lock);
+ platform_device_unregister(rbu_device);
+}
+
+module_exit(dcdrbu_exit);
+module_init(dcdrbu_init);
projects / platform / kernel / linux-exynos.git / commitdiff