diff options
Diffstat (limited to 'drivers/serial/serial_stm32x7.c')
| -rw-r--r-- | drivers/serial/serial_stm32x7.c | 159 |
1 files changed, 0 insertions, 159 deletions
diff --git a/drivers/serial/serial_stm32x7.c b/drivers/serial/serial_stm32x7.c deleted file mode 100644 index d1580e3cb5..0000000000 --- a/drivers/serial/serial_stm32x7.c +++ /dev/null @@ -1,159 +0,0 @@ -/* - * Copyright (C) 2016, STMicroelectronics - All Rights Reserved - * Author(s): Vikas Manocha, <vikas.manocha@st.com> for STMicroelectronics. - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <common.h> -#include <clk.h> -#include <dm.h> -#include <asm/io.h> -#include <serial.h> -#include <asm/arch/stm32.h> -#include "serial_stm32x7.h" - -DECLARE_GLOBAL_DATA_PTR; - -static int stm32_serial_setbrg(struct udevice *dev, int baudrate) -{ - struct stm32x7_serial_platdata *plat = dev_get_platdata(dev); - bool stm32f4 = plat->uart_info->stm32f4; - fdt_addr_t base = plat->base; - u32 int_div, mantissa, fraction, oversampling; - - int_div = DIV_ROUND_CLOSEST(plat->clock_rate, baudrate); - - if (int_div < 16) { - oversampling = 8; - setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_OVER8); - } else { - oversampling = 16; - clrbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_OVER8); - } - - mantissa = (int_div / oversampling) << USART_BRR_M_SHIFT; - fraction = int_div % oversampling; - - writel(mantissa | fraction, base + BRR_OFFSET(stm32f4)); - - return 0; -} - -static int stm32_serial_getc(struct udevice *dev) -{ - struct stm32x7_serial_platdata *plat = dev_get_platdata(dev); - bool stm32f4 = plat->uart_info->stm32f4; - fdt_addr_t base = plat->base; - - if ((readl(base + ISR_OFFSET(stm32f4)) & USART_SR_FLAG_RXNE) == 0) - return -EAGAIN; - - return readl(base + RDR_OFFSET(stm32f4)); -} - -static int stm32_serial_putc(struct udevice *dev, const char c) -{ - struct stm32x7_serial_platdata *plat = dev_get_platdata(dev); - bool stm32f4 = plat->uart_info->stm32f4; - fdt_addr_t base = plat->base; - - if ((readl(base + ISR_OFFSET(stm32f4)) & USART_SR_FLAG_TXE) == 0) - return -EAGAIN; - - writel(c, base + TDR_OFFSET(stm32f4)); - - return 0; -} - -static int stm32_serial_pending(struct udevice *dev, bool input) -{ - struct stm32x7_serial_platdata *plat = dev_get_platdata(dev); - bool stm32f4 = plat->uart_info->stm32f4; - fdt_addr_t base = plat->base; - - if (input) - return readl(base + ISR_OFFSET(stm32f4)) & - USART_SR_FLAG_RXNE ? 1 : 0; - else - return readl(base + ISR_OFFSET(stm32f4)) & - USART_SR_FLAG_TXE ? 0 : 1; -} - -static int stm32_serial_probe(struct udevice *dev) -{ - struct stm32x7_serial_platdata *plat = dev_get_platdata(dev); - struct clk clk; - fdt_addr_t base = plat->base; - int ret; - bool stm32f4; - u8 uart_enable_bit; - - plat->uart_info = (struct stm32_uart_info *)dev_get_driver_data(dev); - stm32f4 = plat->uart_info->stm32f4; - uart_enable_bit = plat->uart_info->uart_enable_bit; - - ret = clk_get_by_index(dev, 0, &clk); - if (ret < 0) - return ret; - - ret = clk_enable(&clk); - if (ret) { - dev_err(dev, "failed to enable clock\n"); - return ret; - } - - plat->clock_rate = clk_get_rate(&clk); - if (plat->clock_rate < 0) { - clk_disable(&clk); - return plat->clock_rate; - }; - - /* Disable uart-> disable overrun-> enable uart */ - clrbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_RE | USART_CR1_TE | - BIT(uart_enable_bit)); - if (plat->uart_info->has_overrun_disable) - setbits_le32(base + CR3_OFFSET(stm32f4), USART_CR3_OVRDIS); - if (plat->uart_info->has_fifo) - setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_FIFOEN); - setbits_le32(base + CR1_OFFSET(stm32f4), USART_CR1_RE | USART_CR1_TE | - BIT(uart_enable_bit)); - - return 0; -} - -static const struct udevice_id stm32_serial_id[] = { - { .compatible = "st,stm32-uart", .data = (ulong)&stm32f4_info}, - { .compatible = "st,stm32f7-uart", .data = (ulong)&stm32f7_info}, - { .compatible = "st,stm32h7-uart", .data = (ulong)&stm32h7_info}, - {} -}; - -static int stm32_serial_ofdata_to_platdata(struct udevice *dev) -{ - struct stm32x7_serial_platdata *plat = dev_get_platdata(dev); - - plat->base = devfdt_get_addr(dev); - if (plat->base == FDT_ADDR_T_NONE) - return -EINVAL; - - 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, - .of_match = of_match_ptr(stm32_serial_id), - .ofdata_to_platdata = of_match_ptr(stm32_serial_ofdata_to_platdata), - .platdata_auto_alloc_size = sizeof(struct stm32x7_serial_platdata), - .ops = &stm32_serial_ops, - .probe = stm32_serial_probe, - .flags = DM_FLAG_PRE_RELOC, -}; |