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#ifndef __BOOTCODE__
#include <linux/module.h>
#include <linux/init.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/version.h>
#include <platform.h> // GPIO_ABCD_IRQ, PABCD_ISR
#include <asm/delay.h>
#endif
#ifdef __BOOTCODE__
#define ENODEV 19 /* No such device */
#define __init
#endif
#if defined( LINUX_VERSION_CODE ) && (LINUX_VERSION_CODE == KERNEL_VERSION(2,6,30))
#define LINUX_KERNEL_VERSION_2_6_30 1
#endif
#ifdef LINUX_KERNEL_VERSION_2_6_30
#include "bspchip.h" // BSP_GPIO_EFGH_IRQ
#endif
// ------------------------------------------------------------------
// ------------------------------------------------------------------
// Basic setup information
#define SC16IS7X0_BAUDRATE 38400
#ifdef CONFIG_SERIAL_SC16IS7X0_XTAL1_CLK_1843200
#define XTAL1_CLK ( SC16IS7X0_BAUDRATE * 3 * 16 ) // 1.8432 MHZ
#elif defined( CONFIG_SERIAL_SC16IS7X0_XTAL1_CLK_14746500 )
#define XTAL1_CLK ( SC16IS7X0_BAUDRATE * 24 * 16 ) // 14.7465 MHZ (NXP demoboard)
#endif
// ------------------------------------------------------------------
// ------------------------------------------------------------------
// I2C level function
#ifndef __BOOTCODE__
#include "i2c.h"
#else
#include "i2c.h"
#endif
#define I2C_GPIO_ID( port, pin ) ( ( ( port - 'A' ) << 16 ) | ( pin ) )
#ifdef CONFIG_RTK_VOIP_GPIO_8954C_V200
#define SC16IS7X0_SCL I2C_GPIO_ID( 'G', 1 ) // SCL = G1
#define SC16IS7X0_SDA I2C_GPIO_ID( 'G', 0 ) // SDA = G0
#define SC16IS7X0_IRQ I2C_GPIO_ID( 'E', 2 ) // IRQ = E2
#define SC16IS7X0_IRQ_NUM BSP_GPIO_EFGH_IRQ // BSP_GPIO_EFGH_IRQ=33
#define SC16IS7X0_IRQ_STATUS_BIT ( 1 << ( 0 + 2 ) ) // clean pending status of E2
#define SC16IS7X0_IRQ_STATUS_REG PEFGH_ISR
#elif defined (CONFIG_RTK_VOIP_GPIO_8954C_V400)
#error "unknown SC16IS7X0 I2C pin assignment"
#else
#define SC16IS7X0_RESET I2C_GPIO_ID( 'A', 4 ) // RESET = D3
#define SC16IS7X0_SCL I2C_GPIO_ID( 'A', 3 ) // SCL = D4
#define SC16IS7X0_SDA I2C_GPIO_ID( 'A', 5 ) // SDA = D5
#define SC16IS7X0_IRQ I2C_GPIO_ID( 'A', 6 ) // IRQ = D6
#define SC16IS7X0_IRQ_NUM BSP_GPIO_ABCD_IRQ // GPIO_ABCD_IRQ=16
#define SC16IS7X0_IRQ_STATUS_BIT ( 1 << ( 0 + 6 ) ) // clean pending status of D6
#define SC16IS7X0_IRQ_STATUS_REG PABCD_ISR
#endif
#define SC16IS7X0_I2C_ADDR 0x9A
#define SC16IS7X0_I2C_WRITE 0x00
#define SC16IS7X0_I2C_READ 0x01
static i2c_dev_t sc16is7x0_i2c_dev = {
.sclk = SC16IS7X0_SCL,
.sdio = SC16IS7X0_SDA,
.irq = SC16IS7X0_IRQ,
#ifdef SC16IS7X0_RESET
.reset = SC16IS7X0_RESET,
#endif
};
// Register address byte
// 7 : not used
// 6~3: A[3:0] UART's internal register select
// 2~1: channel select: CH1 = 0?!, CH0 = 0
// 0 : not used
#define MK_SC16IS7X0_REG_ADDR( uart_reg ) ( ( uart_reg & 0x0F ) << 3 )
unsigned int serial_in_i2c(unsigned int addr, int offset)
{
unsigned short int data;
//printk( "serial_in_i2c(%X):%X\n", addr, offset );
if( addr != SC16IS7X0_I2C_ADDR )
return 0;
// start
i2c_start_condition( &sc16is7x0_i2c_dev );
// addr + write
i2c_serial_write_byte( &sc16is7x0_i2c_dev, SC16IS7X0_I2C_ADDR |
SC16IS7X0_I2C_WRITE );
// read ACK
if( i2c_ACK( &sc16is7x0_i2c_dev ) != 0 )
return 0;
// write register address
i2c_serial_write_byte( &sc16is7x0_i2c_dev, MK_SC16IS7X0_REG_ADDR( offset ) );
// read ACK
if( i2c_ACK( &sc16is7x0_i2c_dev ) != 0 )
return 0;
// start
i2c_start_condition( &sc16is7x0_i2c_dev );
// addr + read
i2c_serial_write_byte( &sc16is7x0_i2c_dev, SC16IS7X0_I2C_ADDR |
SC16IS7X0_I2C_READ );
// read ACK
if( i2c_ACK( &sc16is7x0_i2c_dev ) != 0 )
return 0;
// read data
i2c_serial_read( &sc16is7x0_i2c_dev, &data );
// write negative-ACK
i2c_ACK_w( &sc16is7x0_i2c_dev, 1 );
// stop
i2c_stop_condition( &sc16is7x0_i2c_dev );
//printk( "in[%X]\n", data );
return data;
}
unsigned int serial_out_i2c(unsigned int addr, int offset, int value)
{
//printk( "serial_out_i2c(%X):%X,%X\n", addr, offset, value );
if( addr != SC16IS7X0_I2C_ADDR )
return 0;
// start
i2c_start_condition( &sc16is7x0_i2c_dev );
// addr + write
i2c_serial_write_byte( &sc16is7x0_i2c_dev, SC16IS7X0_I2C_ADDR |
SC16IS7X0_I2C_WRITE );
// read ACK
if( i2c_ACK( &sc16is7x0_i2c_dev ) != 0 )
return 0;
// write register address
i2c_serial_write_byte( &sc16is7x0_i2c_dev, MK_SC16IS7X0_REG_ADDR( offset ) );
// read ACK
if( i2c_ACK( &sc16is7x0_i2c_dev ) != 0 )
return 0;
// write data
i2c_serial_write_byte( &sc16is7x0_i2c_dev, value );
// read ACK
if( i2c_ACK( &sc16is7x0_i2c_dev ) != 0 )
return 0;
// stop
i2c_stop_condition( &sc16is7x0_i2c_dev );
return 0;
}
static void sc16is7X0_set_baudrate(unsigned int baud)
{
unsigned int divisor;
unsigned char c;
//setup baudrate and etc (copy from 8250_early.c)
#define serial_out( port, offset, value ) serial_out_i2c( SC16IS7X0_I2C_ADDR, offset, value )
#define serial_in( port, offset ) serial_in_i2c( SC16IS7X0_I2C_ADDR, offset )
//divisor = port->uartclk / (16 * device->baud);
divisor = XTAL1_CLK / (16 * SC16IS7X0_BAUDRATE);
c = serial_in(port, UART_LCR);
serial_out(port, UART_LCR, c | UART_LCR_DLAB);
serial_out(port, UART_DLL, divisor & 0xff);
serial_out(port, UART_DLM, (divisor >> 8) & 0xff);
serial_out(port, UART_LCR, c & ~UART_LCR_DLAB);
#undef serial_out
#undef serial_in
}
static void __init sc16is7x0_init_i2c( void )
{
// init SCL / SDA
i2c_init_SCL_SDA( &sc16is7x0_i2c_dev );
serial_in_i2c( SC16IS7X0_I2C_ADDR, 1 ); // avoid NO ACK at first time access
// Enable IRQ
i2c_enable_irq( &sc16is7x0_i2c_dev );
}
// ------------------------------------------------------------------
// ------------------------------------------------------------------
// Early printk or bootcode
int __init early_sc16is7x0_init_i2c_and_check( void )
{
unsigned int bak;
// init i2c
sc16is7x0_init_i2c();
// do simple test (write non-zero, because NO ACK return zero)
bak = serial_in_i2c( SC16IS7X0_I2C_ADDR, 1 );
serial_out_i2c( SC16IS7X0_I2C_ADDR, 1, 0x0F );
if( serial_in_i2c( SC16IS7X0_I2C_ADDR, 1 ) != 0x0F )
goto label_out;
// restore
serial_out_i2c( SC16IS7X0_I2C_ADDR, 1, bak );
return 0;
label_out:
return -ENODEV;
}
#ifdef LINUX_KERNEL_VERSION_2_6_30
int __init early_sc16is7x0_setup(struct console * console, char * option)
{
int ret;
unsigned int divisor;
unsigned char c;
ret = early_sc16is7x0_init_i2c_and_check();
if( ret )
return ret;
// setup baudrate and etc (copy from 8250_early.c)
#define serial_out( port, offset, value ) serial_out_i2c( SC16IS7X0_I2C_ADDR, offset, value )
#define serial_in( port, offset ) serial_in_i2c( SC16IS7X0_I2C_ADDR, offset )
serial_out(port, UART_LCR, 0x3); /* 8n1 */
serial_out(port, UART_IER, 0); /* no interrupt */
serial_out(port, UART_FCR, 0); /* no fifo */
serial_out(port, UART_MCR, 0x3); /* DTR + RTS */
//divisor = port->uartclk / (16 * device->baud);
divisor = XTAL1_CLK / (16 * SC16IS7X0_BAUDRATE);
c = serial_in(port, UART_LCR);
serial_out(port, UART_LCR, c | UART_LCR_DLAB);
serial_out(port, UART_DLL, divisor & 0xff);
serial_out(port, UART_DLM, (divisor >> 8) & 0xff);
serial_out(port, UART_LCR, c & ~UART_LCR_DLAB);
#undef serial_out
#undef serial_in
return 0;
}
#endif
// ------------------------------------------------------------------
// ------------------------------------------------------------------
// Bootcode wrapper
#if defined( __BOOTCODE__ ) || defined( LINUX_KERNEL_VERSION_2_6_30 )
unsigned int sc16is7x0_serial_out_i2c(int offset, int value)
{
return serial_out_i2c( SC16IS7X0_I2C_ADDR, offset, value );
}
unsigned int sc16is7x0_serial_in_i2c(int offset)
{
return serial_in_i2c( SC16IS7X0_I2C_ADDR, offset );
}
#endif
// ------------------------------------------------------------------
// ------------------------------------------------------------------
// Platform level function
#ifndef __BOOTCODE__
int sc16is7x0_clean_interrupt( int irq )
{
if( irq != SC16IS7X0_IRQ_NUM )
return 0; // not my irq
// clean my bit only
if( REG32( SC16IS7X0_IRQ_STATUS_REG ) & SC16IS7X0_IRQ_STATUS_BIT ) {
REG32( SC16IS7X0_IRQ_STATUS_REG ) = SC16IS7X0_IRQ_STATUS_BIT;
return 0;
}
return -1; // not my gpio
}
#endif
// ------------------------------------------------------------------
// ------------------------------------------------------------------
// UART level function
#ifndef __BOOTCODE__
#ifdef LINUX_KERNEL_VERSION_2_6_30
#define PORT_TYPE PORT_16654
#define PORT_FLAGS /*UPF_BOOT_AUTOCONF |*/ UPF_SKIP_TEST | UPF_FIXED_TYPE | UPF_SHARE_IRQ
#else
#define PORT_TYPE 0 // autoconf (2.6.19)
#define PORT_FLAGS /*UPF_BOOT_AUTOCONF |*/ UPF_SKIP_TEST
#endif
#define PORT(_base,_irq) \
{ \
.type = PORT_TYPE, \
.iobase = _base, \
.irq = _irq, \
.uartclk = XTAL1_CLK, \
.iotype = UPIO_I2C, \
.flags = PORT_FLAGS, \
}
static struct plat_serial8250_port sc16is7x0_data[] = {
PORT(SC16IS7X0_I2C_ADDR, SC16IS7X0_IRQ_NUM),
{ },
};
static struct platform_device sc16is7x0_device = {
.name = "serial8250",
.id = PLAT8250_DEV_SC16IS7X0,
.dev = {
.platform_data = sc16is7x0_data,
},
};
void __init sc16is7x0_get_port( struct uart_port *port )
{
// call by static void __init serial_init(void)
// in linux-2.6.x/arch/mips/realtek/rtl8196b/setup.c
memset(port, 0, sizeof(*port));
port ->type = PORT_16654;
port ->iobase = SC16IS7X0_I2C_ADDR;
port ->irq = SC16IS7X0_IRQ_NUM;
port ->uartclk = XTAL1_CLK;
#ifdef LINUX_KERNEL_VERSION_2_6_30
port ->flags = PORT_FLAGS;
#else
//port ->flags = UPF_SKIP_TEST | UPF_LOW_LATENCY | UPF_SPD_CUST;
port ->flags = UPF_SKIP_TEST | UPF_SPD_CUST;
//port ->flags = UPF_SKIP_TEST | UPF_SPD_CUST | UART_CAP_FIFO | UART_CAP_EFR | UART_CAP_SLEEP
#endif
port ->iotype = UPIO_I2C;
port ->fifosize = 1;
#ifdef LINUX_KERNEL_VERSION_2_6_30
// linux 2.6.30's early_serial_setup()r doesn't copy custom_divisor
#else
port ->custom_divisor = XTAL1_CLK / (SC16IS7X0_BAUDRATE * 16);
#endif
}
static int __init sc16is7x0_init(void)
{
int ret;
sc16is7x0_init_i2c();
ret = platform_device_register(&sc16is7x0_device);
//enable irq
REG32(BSP_GIMR) |= BSP_GPIO_ABCD_IE;
return ret;
}
module_init(sc16is7x0_init);
MODULE_AUTHOR("Realtek");
MODULE_DESCRIPTION("8250 serial probe module for SC16IS7x0");
MODULE_LICENSE("GPL");
#endif
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