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/*
* Copyright (C) 2012 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/delay.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/irq.h>
#include <linux/printk.h>
#include <linux/sched.h>
#include <linux/wakelock.h>
#include <linux/bitops.h>
#include <mach/board.h>
#include "ipc_gpio.h"
#include <linux/proc_fs.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
#include <linux/dma-mapping.h>
#define SDHCI_RESEND_SUPPORT
#define PIN_STATUS_ACTIVE 1
#define PIN_STATUS_INACTIVE 0
#define DRIVER_NAME "sdhci_hal"
#define DBG(f, x...) pr_debug(DRIVER_NAME " [%s()]: " f, __func__,## x)
#define MAX_MIPC_WAIT_TIMEOUT 2000
static unsigned int cp_to_ap_req_irq;
static wait_queue_head_t s_gpio_cp_ready_wq;
extern void process_modem_packet(unsigned long data);
int cp2ap_req(void)
{
DBG("[SDIO_IPC] cp_to_ap_req=%d\r\n",gpio_get_value(GPIO_CP_TO_AP_RDY));
return (PIN_STATUS_ACTIVE == gpio_get_value(GPIO_CP_TO_AP_RDY));
}
void ap2cp_req_enable(void)
{
DBG("SDIO ap2cp_req_enable AP_TO_CP_RTS is 1\r\n");
gpio_set_value(GPIO_AP_TO_CP_RTS, PIN_STATUS_ACTIVE);
}
void ap2cp_req_disable(void)
{
DBG("SDIO ap2cp_req_disable AP_TO_CP_RTS is 0\r\n");
gpio_set_value(GPIO_AP_TO_CP_RTS, PIN_STATUS_INACTIVE);
}
extern u32 wake_up_mipc_rx_thread(u32 need_to_rx_data);
extern void set_cp_awake(bool awake);
static irqreturn_t cp_to_ap_req_handle(int irq, void *handle)
{
int cur = cp2ap_req();
if(cur) {
irq_set_irq_type(cp_to_ap_req_irq, IRQ_TYPE_LEVEL_LOW);
} else {
irq_set_irq_type(cp_to_ap_req_irq, IRQ_TYPE_LEVEL_HIGH);
}
DBG("[SDIO_IPC]cp_to_ap_req_handle:%d\r\n ", cur);
if(cur) {
set_cp_awake(true);
wake_up_mipc_rx_thread(1);
}
return IRQ_HANDLED;
}
/*****************************************************************************\
* *
* Driver init/exit *
* *
\*****************************************************************************/
int sdhci_hal_gpio_init(void)
{
int ret;
DBG("sdhci_hal_gpio init \n");
init_waitqueue_head(&s_gpio_cp_ready_wq);
//config ap_to_cp_rts
ret = gpio_request(GPIO_AP_TO_CP_RTS, "ap_to_cp_rts");
if (ret) {
DBG("Cannot request GPIO %d\r\n", GPIO_AP_TO_CP_RTS);
gpio_free(GPIO_AP_TO_CP_RTS);
return ret;
}
gpio_direction_output(GPIO_AP_TO_CP_RTS, 1); //use new sdio dma option, default value change to 1
gpio_export(GPIO_AP_TO_CP_RTS, 1);
//config cp_out_rdy
ret = gpio_request(GPIO_CP_TO_AP_RDY, "cp_out_rdy");
if (ret) {
DBG("Cannot request GPIO %d\r\n",GPIO_CP_TO_AP_RDY);
gpio_free(GPIO_CP_TO_AP_RDY);
return ret;
}
gpio_direction_input(GPIO_CP_TO_AP_RDY);
gpio_export(GPIO_CP_TO_AP_RDY, 1);
return 0;
}
int sdhci_hal_gpio_irq_init(void)
{
int ret;
DBG("sdhci_hal_gpio init \n");
cp_to_ap_req_irq = gpio_to_irq(GPIO_CP_TO_AP_RDY);
if (cp_to_ap_req_irq < 0)
return -1;
ret = request_threaded_irq(cp_to_ap_req_irq, cp_to_ap_req_handle,
NULL, IRQF_NO_SUSPEND|IRQF_DISABLED|IRQF_TRIGGER_HIGH,
"cp_to_ap_req_irq", NULL);
if (ret) {
DBG("lee :cannot alloc cp_to_ap_req_irq, err %d\r\r\n", ret);
return ret;
}
enable_irq_wake(cp_to_ap_req_irq);
if(cp2ap_req()) {
printk("[SDIO_IPC]initial check call cp_to_ap_req_handle()\r\n ");
cp_to_ap_req_handle(0, NULL);
}
return 0;
}
void sdhci_hal_gpio_exit(void)
{
DBG("sdhci_hal gpio exit\r\n");
gpio_free(GPIO_AP_TO_CP_RTS);
gpio_free(GPIO_CP_TO_AP_RDY);
free_irq(cp_to_ap_req_irq, NULL);
}
//MODULE_AUTHOR("Bin.Xu<bin.xu@spreadtrum.com>");
//MODULE_DESCRIPTION("GPIO driver about mux sdio");
//MODULE_LICENSE("GPL");
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