diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/Kconfig | 10 | ||||
| -rw-r--r-- | drivers/serial/Makefile | 1 | ||||
| -rw-r--r-- | drivers/serial/ns16550.c | 36 | ||||
| -rw-r--r-- | drivers/serial/serial-uclass.c | 2 | ||||
| -rw-r--r-- | drivers/serial/serial.c | 2 | ||||
| -rw-r--r-- | drivers/serial/serial_stm32.c | 117 |
6 files changed, 152 insertions, 16 deletions
diff --git a/drivers/serial/Kconfig b/drivers/serial/Kconfig index 1686a1f951..54e6f26d38 100644 --- a/drivers/serial/Kconfig +++ b/drivers/serial/Kconfig @@ -66,6 +66,16 @@ config DEBUG_UART_CLOCK A default should be provided by your board, but if not you will need to use the correct value here. +config DEBUG_UART_SHIFT + int "UART register shift" + depends on DEBUG_UART + default 0 if DEBUG_UART + help + Some UARTs (notably ns16550) support different register layouts + where the registers are spaced either as bytes, words or some other + value. Use this value to specify the shift to use, where 0=byte + registers, 2=32-bit word registers, etc. + config UNIPHIER_SERIAL bool "UniPhier on-chip UART support" depends on ARCH_UNIPHIER && DM_SERIAL diff --git a/drivers/serial/Makefile b/drivers/serial/Makefile index b385852eee..d183eedbcb 100644 --- a/drivers/serial/Makefile +++ b/drivers/serial/Makefile @@ -44,6 +44,7 @@ obj-$(CONFIG_TEGRA_SERIAL) += serial_tegra.o obj-$(CONFIG_UNIPHIER_SERIAL) += serial_uniphier.o obj-$(CONFIG_OMAP_SERIAL) += serial_omap.o obj-$(CONFIG_X86_SERIAL) += serial_x86.o +obj-$(CONFIG_STM32_SERIAL) += serial_stm32.o ifndef CONFIG_SPL_BUILD obj-$(CONFIG_USB_TTY) += usbtty.o diff --git a/drivers/serial/ns16550.c b/drivers/serial/ns16550.c index 67b1d60171..fd110b3ddc 100644 --- a/drivers/serial/ns16550.c +++ b/drivers/serial/ns16550.c @@ -57,7 +57,7 @@ DECLARE_GLOBAL_DATA_PTR; #ifdef CONFIG_DM_SERIAL -static inline void serial_out_shift(unsigned char *addr, int shift, int value) +static inline void serial_out_shift(void *addr, int shift, int value) { #ifdef CONFIG_SYS_NS16550_PORT_MAPPED outb(value, (ulong)addr); @@ -72,7 +72,7 @@ static inline void serial_out_shift(unsigned char *addr, int shift, int value) #endif } -static inline int serial_in_shift(unsigned char *addr, int shift) +static inline int serial_in_shift(void *addr, int shift) { #ifdef CONFIG_SYS_NS16550_PORT_MAPPED return inb((ulong)addr); @@ -114,9 +114,11 @@ static int ns16550_readb(NS16550_t port, int offset) /* We can clean these up once everything is moved to driver model */ #define serial_out(value, addr) \ - ns16550_writeb(com_port, addr - (unsigned char *)com_port, value) + ns16550_writeb(com_port, \ + (unsigned char *)addr - (unsigned char *)com_port, value) #define serial_in(addr) \ - ns16550_readb(com_port, addr - (unsigned char *)com_port) + ns16550_readb(com_port, \ + (unsigned char *)addr - (unsigned char *)com_port) #endif static inline int calc_divisor(NS16550_t port, int clock, int baudrate) @@ -173,7 +175,6 @@ void NS16550_init(NS16550_t com_port, int baud_divisor) defined(CONFIG_TI81XX) || defined(CONFIG_AM43XX) serial_out(0x7, &com_port->mdr1); /* mode select reset TL16C750*/ #endif - NS16550_setbrg(com_port, 0); serial_out(UART_MCRVAL, &com_port->mcr); serial_out(UART_FCRVAL, &com_port->fcr); if (baud_divisor != -1) @@ -254,15 +255,20 @@ void debug_uart_init(void) */ baud_divisor = calc_divisor(com_port, CONFIG_DEBUG_UART_CLOCK, CONFIG_BAUDRATE); - - serial_out_shift(&com_port->ier, 0, CONFIG_SYS_NS16550_IER); - serial_out_shift(&com_port->mcr, 0, UART_MCRVAL); - serial_out_shift(&com_port->fcr, 0, UART_FCRVAL); - - serial_out_shift(&com_port->lcr, 0, UART_LCR_BKSE | UART_LCRVAL); - serial_out_shift(&com_port->dll, 0, baud_divisor & 0xff); - serial_out_shift(&com_port->dlm, 0, (baud_divisor >> 8) & 0xff); - serial_out_shift(&com_port->lcr, 0, UART_LCRVAL); + baud_divisor = 13; + serial_out_shift(&com_port->ier, CONFIG_DEBUG_UART_SHIFT, + CONFIG_SYS_NS16550_IER); + serial_out_shift(&com_port->mcr, CONFIG_DEBUG_UART_SHIFT, UART_MCRVAL); + serial_out_shift(&com_port->fcr, CONFIG_DEBUG_UART_SHIFT, UART_FCRVAL); + + serial_out_shift(&com_port->lcr, CONFIG_DEBUG_UART_SHIFT, + UART_LCR_BKSE | UART_LCRVAL); + serial_out_shift(&com_port->dll, CONFIG_DEBUG_UART_SHIFT, + baud_divisor & 0xff); + serial_out_shift(&com_port->dlm, CONFIG_DEBUG_UART_SHIFT, + (baud_divisor >> 8) & 0xff); + serial_out_shift(&com_port->lcr, CONFIG_DEBUG_UART_SHIFT, + UART_LCRVAL); } static inline void _debug_uart_putc(int ch) @@ -271,7 +277,7 @@ static inline void _debug_uart_putc(int ch) while (!(serial_in_shift(&com_port->lsr, 0) & UART_LSR_THRE)) ; - serial_out_shift(&com_port->thr, 0, ch); + serial_out_shift(&com_port->thr, CONFIG_DEBUG_UART_SHIFT, ch); } DEBUG_UART_FUNCS diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c index b239691efe..b8c2f48228 100644 --- a/drivers/serial/serial-uclass.c +++ b/drivers/serial/serial-uclass.c @@ -70,7 +70,7 @@ static void serial_find_console_or_panic(void) if (uclass_get_device_by_seq(UCLASS_SERIAL, INDEX, &dev) && uclass_get_device(UCLASS_SERIAL, INDEX, &dev) && (uclass_first_device(UCLASS_SERIAL, &dev) || !dev)) - panic("No serial driver found"); + panic_str("No serial driver found"); #undef INDEX gd->cur_serial_dev = dev; } diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c index 9f78492298..699c410d66 100644 --- a/drivers/serial/serial.c +++ b/drivers/serial/serial.c @@ -154,6 +154,7 @@ serial_initfunc(sa1100_serial_initialize); serial_initfunc(sandbox_serial_initialize); serial_initfunc(sconsole_serial_initialize); serial_initfunc(sh_serial_initialize); +serial_initfunc(stm32_serial_initialize); serial_initfunc(uartlite_serial_initialize); serial_initfunc(zynq_serial_initialize); @@ -246,6 +247,7 @@ void serial_initialize(void) sandbox_serial_initialize(); sconsole_serial_initialize(); sh_serial_initialize(); + stm32_serial_initialize(); uartlite_serial_initialize(); zynq_serial_initialize(); diff --git a/drivers/serial/serial_stm32.c b/drivers/serial/serial_stm32.c new file mode 100644 index 0000000000..3c800961d1 --- /dev/null +++ b/drivers/serial/serial_stm32.c @@ -0,0 +1,117 @@ +/* + * (C) Copyright 2015 + * Kamil Lulko, <rev13@wp.pl> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <serial.h> +#include <asm/arch/stm32.h> + +#define STM32_USART1_BASE (STM32_APB2PERIPH_BASE + 0x1000) +#define RCC_APB2ENR_USART1EN (1 << 4) + +#define USART_BASE STM32_USART1_BASE +#define RCC_USART_ENABLE RCC_APB2ENR_USART1EN + +struct stm32_serial { + 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 void stm32_serial_setbrg(void) +{ + serial_init(); +} + +static int stm32_serial_init(void) +{ + struct stm32_serial *usart = (struct stm32_serial *)USART_BASE; + u32 clock, int_div, frac_div, tmp; + + if ((USART_BASE & STM32_BUS_MASK) == STM32_APB1PERIPH_BASE) { + setbits_le32(&STM32_RCC->apb1enr, RCC_USART_ENABLE); + clock = clock_get(CLOCK_APB1); + } else if ((USART_BASE & STM32_BUS_MASK) == STM32_APB2PERIPH_BASE) { + setbits_le32(&STM32_RCC->apb2enr, RCC_USART_ENABLE); + clock = clock_get(CLOCK_APB2); + } else { + return -1; + } + + int_div = (25 * clock) / (4 * gd->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); + setbits_le32(&usart->cr1, USART_CR1_RE | USART_CR1_TE | USART_CR1_UE); + + return 0; +} + +static int stm32_serial_getc(void) +{ + struct stm32_serial *usart = (struct stm32_serial *)USART_BASE; + while ((readl(&usart->sr) & USART_SR_FLAG_RXNE) == 0) + ; + return readl(&usart->dr); +} + +static void stm32_serial_putc(const char c) +{ + struct stm32_serial *usart = (struct stm32_serial *)USART_BASE; + while ((readl(&usart->sr) & USART_SR_FLAG_TXE) == 0) + ; + writel(c, &usart->dr); +} + +static int stm32_serial_tstc(void) +{ + struct stm32_serial *usart = (struct stm32_serial *)USART_BASE; + u8 ret; + + ret = readl(&usart->sr) & USART_SR_FLAG_RXNE; + return ret; +} + +static struct serial_device stm32_serial_drv = { + .name = "stm32_serial", + .start = stm32_serial_init, + .stop = NULL, + .setbrg = stm32_serial_setbrg, + .putc = stm32_serial_putc, + .puts = default_serial_puts, + .getc = stm32_serial_getc, + .tstc = stm32_serial_tstc, +}; + +void stm32_serial_initialize(void) +{ + serial_register(&stm32_serial_drv); +} + +__weak struct serial_device *default_serial_console(void) +{ + return &stm32_serial_drv; +} |