From: Vikas Manocha Date: Thu, 11 Feb 2016 23:47:19 +0000 (-0800) Subject: stm32x7: add support for stm32x7 serial driver X-Git-Tag: v2016.03-rc3~53 X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=6a12cebd90a752b0214a65b152703ca63a941478;p=u-boot stm32x7: add support for stm32x7 serial driver This patch adds support for stm32f7 family usart peripheral. Signed-off-by: Vikas Manocha Reviewed-by: Simon Glass --- diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index c63999ac41..05bdf56c6f 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_ARC_SERIAL) += serial_arc.o obj-$(CONFIG_UNIPHIER_SERIAL) += serial_uniphier.o obj-$(CONFIG_STM32_SERIAL) += serial_stm32.o obj-$(CONFIG_PIC32_SERIAL) += serial_pic32.o +obj-$(CONFIG_STM32X7_SERIAL) += serial_stm32x7.o ifndef CONFIG_SPL_BUILD obj-$(CONFIG_USB_TTY) += usbtty.o diff --git a/drivers/serial/serial_stm32x7.c b/drivers/serial/serial_stm32x7.c new file mode 100644 index 0000000000..cfbfab7e41 --- /dev/null +++ b/drivers/serial/serial_stm32x7.c @@ -0,0 +1,83 @@ +/* + * (C) Copyright 2016 + * Vikas Manocha, + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include +#include +#include +#include +#include +#include "serial_stm32x7.h" + +DECLARE_GLOBAL_DATA_PTR; + +static int stm32_serial_setbrg(struct udevice *dev, int baudrate) +{ + struct stm32x7_serial_platdata *plat = dev->platdata; + struct stm32_usart *const usart = plat->base; + writel(plat->clock/baudrate, &usart->brr); + + return 0; +} + +static int stm32_serial_getc(struct udevice *dev) +{ + struct stm32x7_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->rd_dr); +} + +static int stm32_serial_putc(struct udevice *dev, const char c) +{ + struct stm32x7_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->tx_dr); + + return 0; +} + +static int stm32_serial_pending(struct udevice *dev, bool input) +{ + struct stm32x7_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 stm32x7_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_stm32x7", + .id = UCLASS_SERIAL, + .ops = &stm32_serial_ops, + .probe = stm32_serial_probe, + .flags = DM_FLAG_PRE_RELOC, +}; diff --git a/drivers/serial/serial_stm32x7.h b/drivers/serial/serial_stm32x7.h new file mode 100644 index 0000000000..6190d67406 --- /dev/null +++ b/drivers/serial/serial_stm32x7.h @@ -0,0 +1,37 @@ +/* + * (C) Copyright 2016 + * Vikas Manocha, + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _SERIAL_STM32_X7_ +#define _SERIAL_STM32_X7_ + +struct stm32_usart { + u32 cr1; + u32 cr2; + u32 cr3; + u32 brr; + u32 gtpr; + u32 rtor; + u32 rqr; + u32 sr; + u32 icr; + u32 rd_dr; + u32 tx_dr; +}; + + +#define USART_CR1_RE (1 << 2) +#define USART_CR1_TE (1 << 3) +#define USART_CR1_UE (1 << 0) + +#define USART_SR_FLAG_RXNE (1 << 5) +#define USART_SR_FLAG_TXE (1 << 7) + +#define USART_BRR_F_MASK 0xFF +#define USART_BRR_M_SHIFT 4 +#define USART_BRR_M_MASK 0xFFF0 + +#endif diff --git a/include/dm/platform_data/serial_stm32x7.h b/include/dm/platform_data/serial_stm32x7.h new file mode 100644 index 0000000000..328a8a3ff2 --- /dev/null +++ b/include/dm/platform_data/serial_stm32x7.h @@ -0,0 +1,17 @@ +/* + * (C) Copyright 2016 + * Vikas Manocha, + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef __SERIAL_STM32x7_H +#define __SERIAL_STM32x7_H + +/* Information about a serial port */ +struct stm32x7_serial_platdata { + struct stm32_usart *base; /* address of registers in physical memory */ + unsigned int clock; +}; + +#endif /* __SERIAL_STM32x7_H */