diff options
Diffstat (limited to 'drivers/serial/serial_stm32.c')
-rw-r--r-- | drivers/serial/serial_stm32.c | 117 |
1 files changed, 0 insertions, 117 deletions
diff --git a/drivers/serial/serial_stm32.c b/drivers/serial/serial_stm32.c deleted file mode 100644 index c793ba6e90..0000000000 --- a/drivers/serial/serial_stm32.c +++ /dev/null @@ -1,117 +0,0 @@ -/* - * (C) Copyright 2015 - * Kamil Lulko, <kamil.lulko@gmail.com> - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <common.h> -#include <dm.h> -#include <asm/io.h> -#include <serial.h> -#include <asm/arch/stm32.h> -#include <dm/platform_data/serial_stm32.h> - -struct stm32_usart { - u32 sr; - u32 dr; - u32 brr; - u32 cr1; - u32 cr2; - u32 cr3; - u32 gtpr; -}; - -#define USART_CR1_RE (1 << 2) -#define USART_CR1_TE (1 << 3) -#define USART_CR1_UE (1 << 13) - -#define USART_SR_FLAG_RXNE (1 << 5) -#define USART_SR_FLAG_TXE (1 << 7) - -#define USART_BRR_F_MASK 0xF -#define USART_BRR_M_SHIFT 4 -#define USART_BRR_M_MASK 0xFFF0 - -DECLARE_GLOBAL_DATA_PTR; - -static int stm32_serial_setbrg(struct udevice *dev, int baudrate) -{ - struct stm32_serial_platdata *plat = dev->platdata; - struct stm32_usart *const usart = plat->base; - u32 clock, int_div, frac_div, tmp; - - if (((u32)usart & STM32_BUS_MASK) == STM32_APB1PERIPH_BASE) - clock = clock_get(CLOCK_APB1); - else if (((u32)usart & STM32_BUS_MASK) == STM32_APB2PERIPH_BASE) - clock = clock_get(CLOCK_APB2); - else - return -EINVAL; - - int_div = (25 * clock) / (4 * baudrate); - tmp = ((int_div / 100) << USART_BRR_M_SHIFT) & USART_BRR_M_MASK; - frac_div = int_div - (100 * (tmp >> USART_BRR_M_SHIFT)); - tmp |= (((frac_div * 16) + 50) / 100) & USART_BRR_F_MASK; - writel(tmp, &usart->brr); - - return 0; -} - -static int stm32_serial_getc(struct udevice *dev) -{ - struct stm32_serial_platdata *plat = dev->platdata; - struct stm32_usart *const usart = plat->base; - - if ((readl(&usart->sr) & USART_SR_FLAG_RXNE) == 0) - return -EAGAIN; - - return readl(&usart->dr); -} - -static int stm32_serial_putc(struct udevice *dev, const char c) -{ - struct stm32_serial_platdata *plat = dev->platdata; - struct stm32_usart *const usart = plat->base; - - if ((readl(&usart->sr) & USART_SR_FLAG_TXE) == 0) - return -EAGAIN; - - writel(c, &usart->dr); - - return 0; -} - -static int stm32_serial_pending(struct udevice *dev, bool input) -{ - struct stm32_serial_platdata *plat = dev->platdata; - struct stm32_usart *const usart = plat->base; - - if (input) - return readl(&usart->sr) & USART_SR_FLAG_RXNE ? 1 : 0; - else - return readl(&usart->sr) & USART_SR_FLAG_TXE ? 0 : 1; -} - -static int stm32_serial_probe(struct udevice *dev) -{ - struct stm32_serial_platdata *plat = dev->platdata; - struct stm32_usart *const usart = plat->base; - setbits_le32(&usart->cr1, USART_CR1_RE | USART_CR1_TE | USART_CR1_UE); - - return 0; -} - -static const struct dm_serial_ops stm32_serial_ops = { - .putc = stm32_serial_putc, - .pending = stm32_serial_pending, - .getc = stm32_serial_getc, - .setbrg = stm32_serial_setbrg, -}; - -U_BOOT_DRIVER(serial_stm32) = { - .name = "serial_stm32", - .id = UCLASS_SERIAL, - .ops = &stm32_serial_ops, - .probe = stm32_serial_probe, - .flags = DM_FLAG_PRE_RELOC, -}; |