AT91SAM9263扩展XR16V554D出错

fishhead

root@at91sam9263ek:~# cat /dev/ttyS3
cat: read error: Input/output error

root@at91sam9263ek:~# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:unknown mmio:0x30000018 irq:86
1: uart:unknown port:00000000 irq:0
2: uart:unknown port:00000000 irq:0
3: uart:unknown port:00000000 irq:0







代码如下：

#include <linux/module.h>
#include <linux/init.h>
#include <linux/serial_8250.h>
#include <mach/gpio.h>
#include <mach/at91sam9_smc.h>
#include <../sam9_smc.h>

#define XR16V554_BASE1 (AT91_CHIPSELECT_2 + 0X00) //Base address of USART0
#define XR16V554_BASE2 (AT91_CHIPSELECT_2 + 0X08)
#define XR16V554_BASE3 (AT91_CHIPSELECT_2 + 0X10)
#define XR16V554_BASE4 (AT91_CHIPSELECT_2 + 0X18)

#define XR16V554_IRQ1 AT91_PIN_PB19
#define XR16V554_IRQ2 AT91_PIN_PB20
#define XR16V554_IRQ3 AT91_PIN_PB21
#define XR16V554_IRQ4 AT91_PIN_PB22

/* Tuned for MCLK=100MHZ also applied for MCLK=133MHZ */
static struct sam9_smc_config __initdata ek_xr16v554_smc_config = {
.ncs_read_setup         = 0,
.nrd_setup         = 2,
.ncs_write_setup        = 0,
.nwe_setup         = 2,

.ncs_read_pulse         = 16, /* min 40ns */
.nrd_pulse         = 12, /* min 40ns */
.ncs_write_pulse        = 16,
.nwe_pulse         = 12,

.read_cycle         = 18,
.write_cycle         = 18,

.mode         = AT91_SMC_READMODE | AT91_SMC_WRITEMODE | AT91_SMC_EXNWMODE_DISABLE | AT91_SMC_DBW_8,
.tdf_cycles         = 10,
};


#define PORT(_base,_irq)         \
{         \
.mapbase        = _base,         \
.irq         = _irq,         \
.uartclk        = 7372800,         \
.iotype         = UPIO_MEM,         \
.regshift        = 0, \
.flags         = UPF_BOOT_AUTOCONF | UPF_IOREMAP,\
}

static struct plat_serial8250_port exar_data[] = {
PORT(XR16V554_BASE1, XR16V554_IRQ1),
PORT(XR16V554_BASE2, XR16V554_IRQ2),
PORT(XR16V554_BASE3, XR16V554_IRQ3),
PORT(XR16V554_BASE4, XR16V554_IRQ4),
{ },
};

static struct platform_device exar_device = {
.name         = "serial8250",
.id         = PLAT8250_DEV_AT91_XR16V554,
.dev         = {
.platform_data        = &exar_data,
},
};

static int __init exar_init(void)
{
/* Set the inerrupt pin to gpio and enable pullup. */
at91_set_GPIO_periph(AT91_PIN_PB19, 1);
at91_set_GPIO_periph(AT91_PIN_PB20, 1);
at91_set_GPIO_periph(AT91_PIN_PB21, 1);
at91_set_GPIO_periph(AT91_PIN_PB22, 1);

/* Enable input and pullup. */
at91_set_gpio_input(AT91_PIN_PB19, 1);
at91_set_gpio_input(AT91_PIN_PB20, 1);
at91_set_gpio_input(AT91_PIN_PB21, 1);
at91_set_gpio_input(AT91_PIN_PB22, 1);

/* Enable glitch. */
at91_set_deglitch(AT91_PIN_PB19, 1);
at91_set_deglitch(AT91_PIN_PB20, 1);
at91_set_deglitch(AT91_PIN_PB21, 1);
at91_set_deglitch(AT91_PIN_PB22, 1);

/* Set up the 8-bit bus */
/* configure chip-select 2 (XR16V554D) */
sam9_smc_configure(2, &ek_xr16v554_smc_config);

printk("8250_at91_xr16v554 device register!\n");

return platform_device_register(&exar_device);
}

module_init(exar_init);

fishhead

而且启动的时候也没有打印16C554串口信息：

atmel_lcdfb atmel_lcdfb.0: 150KiB frame buffer at 23980000 (mapped at ffc00000)
atmel_lcdfb atmel_lcdfb.0: fb0: Atmel LCDC at 0x00700000 (mapped at c48c0000), irq 26
Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
8250_at91_xr16v554 device register!
atmel_usart.0: ttyAT0 at MMIO 0xfeffee00 (irq = 1) is a ATMEL_SERIAL
atmel_usart.1: ttyAT1 at MMIO 0xfff8c000 (irq = 7) is a ATMEL_SERIAL
brd: module loaded
loop: module loaded

fishhead

考 原来是车间的小妹把一个地址线焊短路了