| /* |
| * linux/arch/arm/mach-omap1/serial.c |
| * |
| * OMAP1 serial support. |
| * |
| * 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. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/init.h> |
| #include <linux/irq.h> |
| #include <linux/delay.h> |
| #include <linux/serial.h> |
| #include <linux/tty.h> |
| #include <linux/serial_8250.h> |
| #include <linux/serial_reg.h> |
| #include <linux/clk.h> |
| #include <linux/io.h> |
| |
| #include <asm/mach-types.h> |
| |
| #include <mach/board.h> |
| #include <mach/mux.h> |
| #include <mach/gpio.h> |
| #include <mach/fpga.h> |
| |
| static struct clk * uart1_ck; |
| static struct clk * uart2_ck; |
| static struct clk * uart3_ck; |
| |
| static inline unsigned int omap_serial_in(struct plat_serial8250_port *up, |
| int offset) |
| { |
| offset <<= up->regshift; |
| return (unsigned int)__raw_readb(up->membase + offset); |
| } |
| |
| static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset, |
| int value) |
| { |
| offset <<= p->regshift; |
| __raw_writeb(value, p->membase + offset); |
| } |
| |
| /* |
| * Internal UARTs need to be initialized for the 8250 autoconfig to work |
| * properly. Note that the TX watermark initialization may not be needed |
| * once the 8250.c watermark handling code is merged. |
| */ |
| static void __init omap_serial_reset(struct plat_serial8250_port *p) |
| { |
| omap_serial_outp(p, UART_OMAP_MDR1, 0x07); /* disable UART */ |
| omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */ |
| omap_serial_outp(p, UART_OMAP_MDR1, 0x00); /* enable UART */ |
| |
| if (!cpu_is_omap15xx()) { |
| omap_serial_outp(p, UART_OMAP_SYSC, 0x01); |
| while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01)); |
| } |
| } |
| |
| static struct plat_serial8250_port serial_platform_data[] = { |
| { |
| .membase = OMAP1_IO_ADDRESS(OMAP_UART1_BASE), |
| .mapbase = OMAP_UART1_BASE, |
| .irq = INT_UART1, |
| .flags = UPF_BOOT_AUTOCONF, |
| .iotype = UPIO_MEM, |
| .regshift = 2, |
| .uartclk = OMAP16XX_BASE_BAUD * 16, |
| }, |
| { |
| .membase = OMAP1_IO_ADDRESS(OMAP_UART2_BASE), |
| .mapbase = OMAP_UART2_BASE, |
| .irq = INT_UART2, |
| .flags = UPF_BOOT_AUTOCONF, |
| .iotype = UPIO_MEM, |
| .regshift = 2, |
| .uartclk = OMAP16XX_BASE_BAUD * 16, |
| }, |
| { |
| .membase = OMAP1_IO_ADDRESS(OMAP_UART3_BASE), |
| .mapbase = OMAP_UART3_BASE, |
| .irq = INT_UART3, |
| .flags = UPF_BOOT_AUTOCONF, |
| .iotype = UPIO_MEM, |
| .regshift = 2, |
| .uartclk = OMAP16XX_BASE_BAUD * 16, |
| }, |
| { }, |
| }; |
| |
| static struct platform_device serial_device = { |
| .name = "serial8250", |
| .id = PLAT8250_DEV_PLATFORM, |
| .dev = { |
| .platform_data = serial_platform_data, |
| }, |
| }; |
| |
| /* |
| * Note that on Innovator-1510 UART2 pins conflict with USB2. |
| * By default UART2 does not work on Innovator-1510 if you have |
| * USB OHCI enabled. To use UART2, you must disable USB2 first. |
| */ |
| void __init omap_serial_init(void) |
| { |
| int i; |
| |
| if (cpu_is_omap7xx()) { |
| serial_platform_data[0].regshift = 0; |
| serial_platform_data[1].regshift = 0; |
| serial_platform_data[0].irq = INT_730_UART_MODEM_1; |
| serial_platform_data[1].irq = INT_730_UART_MODEM_IRDA_2; |
| } |
| |
| if (cpu_is_omap15xx()) { |
| serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16; |
| serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16; |
| serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16; |
| } |
| |
| for (i = 0; i < OMAP_MAX_NR_PORTS; i++) { |
| unsigned char reg; |
| |
| switch (i) { |
| case 0: |
| uart1_ck = clk_get(NULL, "uart1_ck"); |
| if (IS_ERR(uart1_ck)) |
| printk("Could not get uart1_ck\n"); |
| else { |
| clk_enable(uart1_ck); |
| if (cpu_is_omap15xx()) |
| clk_set_rate(uart1_ck, 12000000); |
| } |
| if (cpu_is_omap15xx()) { |
| omap_cfg_reg(UART1_TX); |
| omap_cfg_reg(UART1_RTS); |
| if (machine_is_omap_innovator()) { |
| reg = fpga_read(OMAP1510_FPGA_POWER); |
| reg |= OMAP1510_FPGA_PCR_COM1_EN; |
| fpga_write(reg, OMAP1510_FPGA_POWER); |
| udelay(10); |
| } |
| } |
| break; |
| case 1: |
| uart2_ck = clk_get(NULL, "uart2_ck"); |
| if (IS_ERR(uart2_ck)) |
| printk("Could not get uart2_ck\n"); |
| else { |
| clk_enable(uart2_ck); |
| if (cpu_is_omap15xx()) |
| clk_set_rate(uart2_ck, 12000000); |
| else |
| clk_set_rate(uart2_ck, 48000000); |
| } |
| if (cpu_is_omap15xx()) { |
| omap_cfg_reg(UART2_TX); |
| omap_cfg_reg(UART2_RTS); |
| if (machine_is_omap_innovator()) { |
| reg = fpga_read(OMAP1510_FPGA_POWER); |
| reg |= OMAP1510_FPGA_PCR_COM2_EN; |
| fpga_write(reg, OMAP1510_FPGA_POWER); |
| udelay(10); |
| } |
| } |
| break; |
| case 2: |
| uart3_ck = clk_get(NULL, "uart3_ck"); |
| if (IS_ERR(uart3_ck)) |
| printk("Could not get uart3_ck\n"); |
| else { |
| clk_enable(uart3_ck); |
| if (cpu_is_omap15xx()) |
| clk_set_rate(uart3_ck, 12000000); |
| } |
| if (cpu_is_omap15xx()) { |
| omap_cfg_reg(UART3_TX); |
| omap_cfg_reg(UART3_RX); |
| } |
| break; |
| } |
| omap_serial_reset(&serial_platform_data[i]); |
| } |
| } |
| |
| #ifdef CONFIG_OMAP_SERIAL_WAKE |
| |
| static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id) |
| { |
| /* Need to do something with serial port right after wake-up? */ |
| return IRQ_HANDLED; |
| } |
| |
| /* |
| * Reroutes serial RX lines to GPIO lines for the duration of |
| * sleep to allow waking up the device from serial port even |
| * in deep sleep. |
| */ |
| void omap_serial_wake_trigger(int enable) |
| { |
| if (!cpu_is_omap16xx()) |
| return; |
| |
| if (uart1_ck != NULL) { |
| if (enable) |
| omap_cfg_reg(V14_16XX_GPIO37); |
| else |
| omap_cfg_reg(V14_16XX_UART1_RX); |
| } |
| if (uart2_ck != NULL) { |
| if (enable) |
| omap_cfg_reg(R9_16XX_GPIO18); |
| else |
| omap_cfg_reg(R9_16XX_UART2_RX); |
| } |
| if (uart3_ck != NULL) { |
| if (enable) |
| omap_cfg_reg(L14_16XX_GPIO49); |
| else |
| omap_cfg_reg(L14_16XX_UART3_RX); |
| } |
| } |
| |
| static void __init omap_serial_set_port_wakeup(int gpio_nr) |
| { |
| int ret; |
| |
| ret = gpio_request(gpio_nr, "UART wake"); |
| if (ret < 0) { |
| printk(KERN_ERR "Could not request UART wake GPIO: %i\n", |
| gpio_nr); |
| return; |
| } |
| gpio_direction_input(gpio_nr); |
| ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt, |
| IRQF_TRIGGER_RISING, "serial wakeup", NULL); |
| if (ret) { |
| gpio_free(gpio_nr); |
| printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n", |
| gpio_nr); |
| return; |
| } |
| enable_irq_wake(gpio_to_irq(gpio_nr)); |
| } |
| |
| static int __init omap_serial_wakeup_init(void) |
| { |
| if (!cpu_is_omap16xx()) |
| return 0; |
| |
| if (uart1_ck != NULL) |
| omap_serial_set_port_wakeup(37); |
| if (uart2_ck != NULL) |
| omap_serial_set_port_wakeup(18); |
| if (uart3_ck != NULL) |
| omap_serial_set_port_wakeup(49); |
| |
| return 0; |
| } |
| late_initcall(omap_serial_wakeup_init); |
| |
| #endif /* CONFIG_OMAP_SERIAL_WAKE */ |
| |
| static int __init omap_init(void) |
| { |
| return platform_device_register(&serial_device); |
| } |
| arch_initcall(omap_init); |