/* * Copyright (c) 2006-2021, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2020-04-09 Jonne Code refactoring for new bsp */ #include <stddef.h> #include <rthw.h> #include <rtdevice.h> #include <board.h> #define ULCON_OFS 0x00 #define UCON_OFS 0x04 #define UFCON_OFS 0x08 #define UMCON_OFS 0x0c #define UTRSTAT_OFS 0x10 #define UERSTAT_OFS 0x14 #define UFSTAT_OFS 0x18 #define UMSTAT_OFS 0x1c #define UTXH_OFS 0x20 #define URXH_OFS 0x24 #define UBRDIV_OFS 0x28 #define readl(addr) (*(volatile unsigned long *)(addr)) #define writel(addr, value) (*(volatile unsigned long *)(addr) = value) #define PCLK_HZ 50000000 struct hw_uart_device { rt_uint32_t hw_base; rt_uint32_t irqno; }; static rt_err_t s3c2440_serial_configure(struct rt_serial_device *serial, struct serial_configure *cfg) { struct hw_uart_device *uart = serial->parent.user_data; writel(uart->hw_base + UBRDIV_OFS, PCLK_HZ / (cfg->baud_rate * 16)); writel(uart->hw_base + ULCON_OFS, 0x03);// 8bit data, 1bit stop, No parity writel(uart->hw_base + UCON_OFS, 0x05); writel(uart->hw_base + UFCON_OFS, 0x00); writel(uart->hw_base + UMCON_OFS, 0x00); return RT_EOK; } static rt_err_t s3c2440_serial_control(struct rt_serial_device *serial, int cmd, void *arg) { struct hw_uart_device *uart; int mask; RT_ASSERT(serial != RT_NULL); uart = (struct hw_uart_device *)serial->parent.user_data; if (uart->irqno == INTUART0) { mask = BIT_SUB_RXD0; } else if (uart->irqno == INTUART1) { mask = BIT_SUB_RXD1; } else { mask = BIT_SUB_RXD2; } switch (cmd) { case RT_DEVICE_CTRL_CLR_INT: /* disable rx irq */ INTSUBMSK |= mask; break; case RT_DEVICE_CTRL_SET_INT: /* enable rx irq */ INTSUBMSK &= ~mask; break; } return RT_EOK; } static int s3c2440_putc(struct rt_serial_device *serial, char c) { struct hw_uart_device *uart = serial->parent.user_data; while (!(readl(uart->hw_base + UTRSTAT_OFS) & (1 << 2))) { } writel(uart->hw_base + UTXH_OFS, c); return 0; } static int s3c2440_getc(struct rt_serial_device *serial) { struct hw_uart_device *uart = serial->parent.user_data; int ch = -1; if (readl(uart->hw_base + UTRSTAT_OFS) & (1 << 0)) { ch = readl(uart->hw_base + URXH_OFS) & 0x000000FF; } return ch; } static void rt_hw_uart_isr(int irqno, void *param) { struct rt_serial_device *serial = (struct rt_serial_device *)param; rt_hw_serial_isr(serial, RT_SERIAL_EVENT_RX_IND); /*clear SUBSRCPND*/ if (irqno == INTUART0) { SUBSRCPND = BIT_SUB_RXD0; } else if (irqno == INTUART1) { SUBSRCPND = BIT_SUB_RXD1; } else { SUBSRCPND = BIT_SUB_RXD2; } } static struct rt_uart_ops s3c2440_uart_ops = { .configure = s3c2440_serial_configure, .control = s3c2440_serial_control, .putc = s3c2440_putc, .getc = s3c2440_getc }; static struct rt_serial_device _serial0 = { .ops = &s3c2440_uart_ops, .config = RT_SERIAL_CONFIG_DEFAULT, .serial_rx = NULL, .serial_tx = NULL }; static struct hw_uart_device _hwserial0 = { .hw_base = 0x50000000, .irqno = INTUART0 }; static struct rt_serial_device _serial1 = { .ops = &s3c2440_uart_ops, .config = RT_SERIAL_CONFIG_DEFAULT, .serial_rx = NULL, .serial_tx = NULL }; static struct hw_uart_device _hwserial1 = { .hw_base = 0x50004000, .irqno = INTUART1 }; static struct rt_serial_device _serial2 = { .ops = &s3c2440_uart_ops, .config = RT_SERIAL_CONFIG_DEFAULT, .serial_rx = NULL, .serial_tx = NULL }; static struct hw_uart_device _hwserial2 = { .hw_base = 0x50008000, .irqno = INTUART2 }; int rt_hw_uart_init(void) { /* UART0 UART1 UART2 port configure */ GPHCON |= 0xAAAA; /* PULLUP is disable */ GPHUP |= 0xFFF; /* register UART0 device */ rt_hw_serial_register(&_serial0, "uart0", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX, &_hwserial0); rt_hw_interrupt_install(_hwserial0.irqno, rt_hw_uart_isr, &_serial0, "uart0"); rt_hw_interrupt_umask(INTUART0); /* register UART1 device */ rt_hw_serial_register(&_serial1, "uart1", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX, &_hwserial1); rt_hw_interrupt_install(_hwserial1.irqno, rt_hw_uart_isr, &_serial1, "uart1"); rt_hw_interrupt_umask(INTUART1); /* register UART2 device */ rt_hw_serial_register(&_serial2, "uart2", RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX, &_hwserial2); rt_hw_interrupt_install(_hwserial2.irqno, rt_hw_uart_isr, &_serial2, "uart2"); rt_hw_interrupt_umask(INTUART2); return RT_EOK; } INIT_BOARD_EXPORT(rt_hw_uart_init);