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/*
* kernel/driver/char/modem_interface/modem_buffer.c
*
* Generic modem interface pingpang buffer API.
*
* Author: Jiayong Yang(Jiayong.Yang@spreadtrum.com)
* Created: Jul 27, 2012
* Copyright: Spreadtrum Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
/* #define DEBUG */
/* #define VERBOSE_DEBUG */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <mach/modem_interface.h>
#include <linux/kernel.h>
#include <linux/utsname.h>
#include <linux/semaphore.h>
#include <linux/irqflags.h>
#include "modem_buffer.h"
#define dloader_record_timestamp(time)
spinlock_t buffer_lock;
static int buffer_data_size(struct single_buffer_t *buffer)
{
int data_size = 0;
if (buffer->write_point == buffer->read_point)
return 0;
data_size = buffer->write_point - buffer->read_point;
if (buffer->write_point < buffer->read_point)
data_size = buffer->size + data_size;
return data_size;
}
int save_to_receive_buffer(struct modem_buffer *buffer,char *data,int size)
{
int free_space = 0;
int data_size = 0;
int i;
int write_point= buffer->buffer[0].write_point;
if (buffer->type==BUF_RECV) {
do{
data_size = buffer_data_size(&buffer->buffer[0]);
free_space = buffer->buffer[0].size-1-data_size;
if (free_space >= size)
break;
down(&buffer->buf_read_sem);
}while(1);
for(i=0;i<size;i++){
buffer->buffer[0].addr[write_point++]=data[i];
if(write_point >= buffer->buffer[0].size)
write_point = 0;
}
buffer->buffer[0].write_point = write_point;
up(&buffer->buf_read_sem);
return size;
}
return 0;
}
int pingpang_buffer_read(struct modem_buffer *buffer,char *data,int size)
{
int read_len = 0;
int data_size = 0;
int i;
int read_point= buffer->buffer[0].read_point;
if (buffer->type==BUF_RECV) {
do{
if (buffer->buffer[0].write_point != buffer->buffer[0].read_point)
break;
down(&buffer->buf_read_sem);
}while(1);
data_size = buffer_data_size(&buffer->buffer[0]);
if(data_size==0)
return 0;
if(data_size < size){
read_len = data_size;
} else {
read_len = size;
}
for (i=0;i<read_len;i++) {
data[i]= buffer->buffer[0].addr[read_point++];
if(read_point >= buffer->buffer[0].size)
read_point = 0;
}
dloader_record_timestamp(0x30000000|buffer->buffer[0].read_point);
dloader_record_timestamp(0x40000000|read_point);
buffer->buffer[0].read_point = read_point;
up(&buffer->buf_read_sem);
return read_len;
}
return 0;
}
int pingpang_buffer_send(struct modem_buffer *buffer)
{
enum BUF_status_t status;
int i,index;
unsigned long flags;
if(buffer->type == BUF_SEND){
if(buffer->trans_index!=0xFF)
index = buffer->trans_index;
else
index = buffer->save_index;
local_irq_save(flags);
spin_lock_irqsave(&buffer_lock, flags);
for(i=0;i<2;i++){
status = buffer->buffer[index].status;
if ((status != BUF_STATUS_IDLE) && (status != BUF_STATUS_WRITTEN)) {
buffer->buffer[index].status = BUF_STATUS_SENT;
local_irq_restore(flags);
spin_unlock_irqrestore(&buffer_lock, flags);
buffer->trans_index = index;
dloader_record_timestamp(0x50000000|(index<<24)|buffer->buffer[index].write_point);
if(buffer->save_index == index)
buffer->save_index = 1- index;
return index;
}
index = 1 - index;
}
local_irq_restore(flags);
spin_unlock_irqrestore(&buffer_lock, flags);
}
return 0xFF;
}
void pingpang_buffer_send_complete(struct modem_buffer *buffer,int index)
{
if(buffer->type == BUF_SEND){
if(buffer->trans_index == index){
buffer->trans_count += buffer->buffer[index].write_point;
buffer->buffer[index].write_point = 0;
buffer->buffer[index].read_point = 0;
buffer->trans_index = 0xFF;
buffer->buffer[index].status = BUF_STATUS_IDLE;
up(&buffer->buf_write_sem);
}
}
}
int pingpang_buffer_write(struct modem_buffer *buffer,char *data,int size)
{
int index = 0;
int data_size;
int free_space;
int write_point;
int save_flag = 0;
int i;
unsigned long flags;
enum BUF_status_t status;
if(buffer->type == BUF_SEND){
if (size >= buffer->buffer[0].size)
return 0;
do{
index = buffer->save_index;
for(i=0;i<2;i++){
local_irq_save(flags);
status = buffer->buffer[index].status;
if ((status != BUF_STATUS_SENT) &&
(status != BUF_STATUS_FULL) &&
(status != BUF_STATUS_WRITTEN)) {
buffer->buffer[index].status = BUF_STATUS_WRITTEN;
local_irq_restore(flags);
data_size = buffer_data_size(&buffer->buffer[index]);
free_space = buffer->buffer[index].size -1 - data_size;
if(free_space < size){
buffer->buffer[index].status = BUF_STATUS_FULL;
if(buffer->trans_index == 0xFF)
buffer->trans_index = index;
index = 1 - index;
buffer->save_index = index;
} else {
write_point = buffer->buffer[index].write_point;
for(i=0;i<size;i++){
buffer->buffer[index].addr[write_point++]=data[i];
if(write_point >= buffer->buffer[index].size)
write_point = 0;
}
dloader_record_timestamp(0x10000000|(index<<24)|buffer->buffer[index].write_point);
dloader_record_timestamp(0x20000000|(index<<24)|write_point);
buffer->buffer[index].write_point = write_point;
buffer->buffer[index].status = BUF_STATUS_NOEMPTY;
buffer->buffer[index].status = BUF_STATUS_FULL;
if(buffer->trans_index == 0xFF)
buffer->trans_index = index;
save_flag = 1;
}
} else {
local_irq_restore(flags);
index = 1 - index;
}
}
if(save_flag==0)
down(&buffer->buf_write_sem);
}while(save_flag == 0);
}
return size;
}
int pingpang_buffer_init(struct modem_buffer *buffer)
{
char *address;
int divide = 2;
address = kzalloc(RECV_BUFFER_SIZE + 128, GFP_KERNEL);
if (address == NULL)
return -ENOMEM;
if (buffer->type == BUF_RECV)
divide = 4;
buffer->buffer[0].addr = address+32;
buffer->buffer[0].size = RECV_BUFFER_SIZE - RECV_BUFFER_SIZE/divide;
buffer->buffer[0].write_point = 0;
buffer->buffer[0].read_point = 0;
buffer->buffer[0].status = BUF_STATUS_IDLE;
buffer->buffer[1].addr = address + buffer->buffer[0].size+64;
buffer->buffer[1].size = RECV_BUFFER_SIZE - buffer->buffer[0].size;
buffer->buffer[1].read_point = 0;
buffer->buffer[1].write_point = 0;
buffer->buffer[1].status = BUF_STATUS_IDLE;
buffer->lost_count = 0;
buffer->trans_count = 0;
buffer->save_index = 0;
buffer->trans_index = 0xff;
sema_init(&buffer->buf_read_sem,0);
sema_init(&buffer->buf_write_sem,0);
spin_lock_init(&buffer_lock);
return 0;
}
void pingpang_buffer_free(struct modem_buffer *buffer)
{
if (buffer->buffer[0].addr){
kfree(buffer->buffer[0].addr);
buffer->buffer[0].addr = NULL;
buffer->buffer[0].size = 0;
buffer->buffer[0].write_point = 0;
buffer->buffer[0].read_point = 0;
buffer->buffer[0].status = 0;
buffer->buffer[1].addr = NULL;
buffer->buffer[1].size = 0;
buffer->buffer[1].read_point = 0;
buffer->buffer[1].write_point = 0;
buffer->buffer[1].status = 0;
}
}
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