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drivers: uart_ns16550: remove soc specific codes and bug fixes

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* remove soc specific codes
* optimize the caculation of baudrate.

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
This commit is contained in:
Wayne Ren 2019-01-29 14:25:56 +08:00 • committed by Anas Nashif
commit 1e392fbd0a
3 changed files with 17 additions and 13 deletions
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23
drivers/serial/uart_ns16550.c
View file

@ -193,10 +193,8 @@
#ifdef UART_NS16550_ACCESS_IOPORT
#define INBYTE(x) sys_in8(x)
#define OUTBYTE(x, d) sys_out8(d, x)
#ifdef CONFIG_SOC_ARC_IOT
#define UART_REG_ADDR_INTERVAL 4 /* address diff of adjacent regs. */
#else
#define UART_REG_ADDR_INTERVAL 1
#ifndef UART_REG_ADDR_INTERVAL
#define UART_REG_ADDR_INTERVAL 1 /* address diff of adjacent regs. */
#endif
#else
#define INBYTE(x) sys_read8(x)
@ -254,8 +252,12 @@ static void set_baud_rate(struct device *dev, u32_t baud_rate)
u8_t lcr_cache;
if ((baud_rate != 0) && (dev_cfg->sys_clk_freq != 0)) {
/* calculate baud rate divisor */
divisor = ((dev_cfg->sys_clk_freq / baud_rate) >> 4) + 1;
/*
* calculate baud rate divisor. a variant of
* (u32_t)(dev_cfg->sys_clk_freq / (16.0 * baud_rate) + 0.5)
*/
divisor = ((dev_cfg->sys_clk_freq + (baud_rate << 3))
/ baud_rate) >> 4;
/* set the DLAB to access the baud rate divisor registers */
lcr_cache = INBYTE(LCR(dev));
@ -327,17 +329,12 @@ static int uart_ns16550_init(struct device *dev)
old_level = irq_lock();
#ifdef CONFIG_SOC_ARC_IOT
/* enbale clk for uart before write any regs */
OUTBYTE(DLF(dev), 1);
#endif
set_baud_rate(dev, dev_data->baud_rate);
#ifdef CONFIG_UART_NS16550_DLF
set_dlf(dev, dev_data->dlf);
#endif
set_baud_rate(dev, dev_data->baud_rate);
/* 8 data bits, 1 stop bit, no parity, clear DLAB */
OUTBYTE(LCR(dev), LCR_CS8 | LCR_1_STB | LCR_PDIS);

6
soc/arc/snps_arc_iot/Kconfig.defconfig
View file

@ -37,6 +37,9 @@ if SERIAL
config UART_NS16550
def_bool y
config UART_NS16550_DLF
def_bool y
endif # SERIAL
if UART_CONSOLE
@ -44,6 +47,9 @@ if UART_CONSOLE
config UART_NS16550_PORT_0
def_bool y
config UART_NS16550_PORT_0_DLF
default 1
endif # UART_CONSOLE
endif #ARC_IOT

1
soc/arc/snps_arc_iot/soc.h
View file

@ -23,6 +23,7 @@
* UART: use lr and sr to access subsystem uart IP
*/
#define UART_NS16550_ACCESS_IOPORT
#define UART_REG_ADDR_INTERVAL 4
/* ARC EM Core IRQs */