diff options
Diffstat (limited to 'target/linux/realtek/files/drivers/serial/i2c.c')
| -rw-r--r-- | target/linux/realtek/files/drivers/serial/i2c.c | 305 |
1 files changed, 305 insertions, 0 deletions
diff --git a/target/linux/realtek/files/drivers/serial/i2c.c b/target/linux/realtek/files/drivers/serial/i2c.c new file mode 100644 index 000000000..42fdebd03 --- /dev/null +++ b/target/linux/realtek/files/drivers/serial/i2c.c @@ -0,0 +1,305 @@ +#ifdef __UBOOT__
+#include <config.h>
+#endif
+#ifndef __BOOTCODE__
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/string.h>
+#endif
+#ifndef __UBOOT__
+#include <linux/delay.h> // linux and realtek bootcode use
+#endif
+
+#include "gpio.h"
+#include "i2c.h"
+
+#define __i2c_initGpioPin(pid, dir, interrupt) RTK_GPIO_INIT(pid, GPIO_CONT_GPIO, dir, interrupt)
+#define __i2c_getGpioDataBit(pid, pData) RTK_GPIO_GET(pid, pData)
+#define __i2c_setGpioDataBit(pid, data) RTK_GPIO_SET(pid, data)
+
+//-----------------------------
+#if 0 //0: kernel used(udelay), 1: test program used(for(;;))
+#define __test_program_used__
+#else
+#define __kernel_used__
+#endif
+
+#if defined(CONFIG_RTK_VOIP_DRIVERS_CODEC_WM8510)
+//----------------------- WM8510 codec ----------------------------------------------
+#define I2C_RATING_FACTOR 10 //Adjust I2C read and write rating.
+//There is an I2C protocal.
+#define _I2C_WM8510_ //GPIO pin
+//cli() protection for kernel used. Don't define MACRO _WM8510_CLI_PROTECT in test program.
+//#define _WM8510_CLI_PROTECT
+
+#elif defined(CONFIG_RTK_VOIP_DRIVERS_CODEC_ALC5621)
+//----------------------- ALC5621 codec ----------------------------------------------
+#define I2C_RATING_FACTOR 10 //Adjust I2C read and write rating.
+//There is an I2C protocal.
+#define _I2C_ALC5621_ //GPIO pin
+//cli() protection for kernel used. Don't define MACRO _WM8510_CLI_PROTECT in test program.
+ #if defined( CONFIG_RTK_VOIP_GPIO_IPP_8972_V00 ) || defined( CONFIG_RTK_VOIP_GPIO_IPP_8972_V01 ) || defined( CONFIG_RTK_VOIP_GPIO_IPP_8972B_V99 )
+ #define _ALC5621_CLI_PROTECT // 8972 share ALC PIN to other
+ #endif
+#elif defined(CONFIG_SERIAL_SC16IS7X0)
+#define I2C_RATING_FACTOR 1
+#endif
+
+#ifdef __kernel_used__ // pkshih: If we use udelay, factor 1 should be work, doesn't it?
+#undef I2C_RATING_FACTOR
+#define I2C_RATING_FACTOR 1
+#endif
+
+/************************* I2C read/write function ************************/
+void i2c_serial_write_byte(i2c_dev_t* pI2C_Dev, unsigned char data)
+{
+#ifdef __test_program_used__
+ int i;
+#endif
+ char j;
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_OUT, GPIO_INT_DISABLE);//change sdio to output
+ for (j=7;j>=0;j--) {
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, ((data)>>j)&0x00000001);//write data,from MSB to LSB
+ //delay 2 us.
+ #ifdef __kernel_used__
+ udelay(2*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<2000*I2C_RATING_FACTOR;i++);
+ #endif
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 1); /* raise sclk*/
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+ }
+ return;
+}
+
+void i2c_serial_write(i2c_dev_t* pI2C_Dev, unsigned char *data)
+{
+ i2c_serial_write_byte( pI2C_Dev, *data );
+}
+
+unsigned char i2c_ACK(i2c_dev_t* pI2C_Dev)
+{
+#ifdef __test_program_used__
+ int i;
+#endif
+ unsigned int buf;
+#if 0
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, 0); /* fall down sdio*/
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_IN, GPIO_INT_DISABLE);//change sdio to input
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+#endif
+ //__i2c_setGpioDataBit( pI2C_Dev->sdio, 0); /* fall down sdio*/
+
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_IN, GPIO_INT_DISABLE);//change sdio to input
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 1); /* raise sclk*/
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+
+ __i2c_getGpioDataBit(pI2C_Dev->sdio,&buf);
+ if (buf != 0)
+ printk("NO ACK\n");
+ //__i2c_initGpioPin(pI2C_Dev->sdio, GPIO_INT_DISABLE);//change sdio to output
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+ #if 0
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+ #endif
+ return buf;
+}
+
+void i2c_ACK_w(i2c_dev_t* pI2C_Dev, unsigned char data)
+{
+#ifdef __test_program_used__
+ int i;
+#endif
+
+#if 0
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_OUT, GPIO_INT_DISABLE);//change sdio to output
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, data); /* sdio send 0 for ACK, 1 for NACK*/
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+#endif
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+ //for (i=0;i<500*I2C_RATING_FACTOR;i++);
+
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_OUT, GPIO_INT_DISABLE);//change sdio to output
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, data); /* sdio send 0 for ACK, 1 for NACK*/
+
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 1); /* raise sclk*/
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_IN, GPIO_INT_DISABLE);//change sdio to input
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+ #if 0
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+ #endif
+ return;
+}
+
+void i2c_serial_read(i2c_dev_t* pI2C_Dev, unsigned short int *data)
+{
+#ifdef __test_program_used__
+ int i;
+#endif
+ char j;
+ unsigned int buf;
+
+ *data = 0;
+
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_IN, GPIO_INT_DISABLE);//change sdio to input
+ for (j=7;j>=0;j--) {
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+ //delay 2 us.
+ #ifdef __kernel_used__
+ udelay(2*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<2000*I2C_RATING_FACTOR;i++);
+ #endif
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 1); /* raise sclk*/
+ __i2c_getGpioDataBit( pI2C_Dev->sdio, &buf);//read data,from MSB to LSB
+ *data |= (buf<<j);
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+ }
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_OUT, GPIO_INT_DISABLE);//change sdio to output
+ return;
+}
+
+void i2c_start_condition(i2c_dev_t* pI2C_Dev)
+{
+#ifdef __test_program_used__
+ int i;
+#endif
+
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_OUT, GPIO_INT_DISABLE);//change sdio to output
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, 1); /* raise sdio*/
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 1); /* raise sclk*/
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, 0); /* fall down sdio*//*start condition*/
+ //delay 2 us.
+ #ifdef __kernel_used__
+ udelay(2*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<2000*I2C_RATING_FACTOR;i++);
+ #endif
+}
+
+void i2c_stop_condition(i2c_dev_t* pI2C_Dev)
+{
+#ifdef __test_program_used__
+ int i;
+#endif
+
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_OUT, GPIO_INT_DISABLE);//change sdio to output
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 0); /* fall down sclk*/
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, 0); /* fall down sdio*/
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 1); /* raise sclk*/
+ //delay 1 us.
+ #ifdef __kernel_used__
+ udelay(1*I2C_RATING_FACTOR);
+ #endif
+ #ifdef __test_program_used__
+ for (i=0;i<1000*I2C_RATING_FACTOR;i++);
+ #endif
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, 1); /* raise sdio*//*stop condition*/
+}
+
+void i2c_init_SCL_SDA(i2c_dev_t* pI2C_Dev)
+{
+ __i2c_initGpioPin(pI2C_Dev->sclk, GPIO_DIR_OUT, GPIO_INT_DISABLE);
+ __i2c_setGpioDataBit( pI2C_Dev->sclk, 1 );
+ __i2c_initGpioPin(pI2C_Dev->sdio, GPIO_DIR_OUT, GPIO_INT_DISABLE);
+ __i2c_setGpioDataBit( pI2C_Dev->sdio, 1 );
+ __i2c_setGpioDataBit( pI2C_Dev->reset, 1);
+}
+
+void i2c_enable_irq(i2c_dev_t* pI2C_Dev)
+{
+ __i2c_initGpioPin(pI2C_Dev->irq, GPIO_DIR_IN, GPIO_INT_BOTH_EDGE);
+}
+
+void i2c_reset(i2c_dev_t* pI2C_Dev)
+{
+ __i2c_initGpioPin(pI2C_Dev->reset, GPIO_DIR_OUT, GPIO_INT_DISABLE);
+ __i2c_setGpioDataBit( pI2C_Dev->reset, 1);
+ __i2c_setGpioDataBit( pI2C_Dev->reset, 0);
+ udelay( 3 ); // delay 3 us
+ __i2c_setGpioDataBit( pI2C_Dev->reset, 1);
+ udelay( 3 ); // delay 3us
+}
+
|