*/
#include <common.h>
+#include <clk.h>
#include <dm.h>
#include <asm/io.h>
#include <serial.h>
{
struct stm32x7_serial_platdata *plat = dev->platdata;
struct stm32_usart *const usart = plat->base;
- u32 clock, int_div, frac_div, tmp;
+ u32 clock, int_div, mantissa, fraction, oversampling;
if (((u32)usart & STM32_BUS_MASK) == APB1_PERIPH_BASE)
clock = clock_get(CLOCK_APB1);
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);
+ int_div = DIV_ROUND_CLOSEST(clock, baudrate);
+
+ if (int_div < 16) {
+ oversampling = 8;
+ setbits_le32(&usart->cr1, USART_CR1_OVER8);
+ } else {
+ oversampling = 16;
+ clrbits_le32(&usart->cr1, USART_CR1_OVER8);
+ }
+
+ mantissa = (int_div / oversampling) << USART_BRR_M_SHIFT;
+ fraction = int_div % oversampling;
+
+ writel(mantissa | fraction, &usart->brr);
return 0;
}
{
struct stm32x7_serial_platdata *plat = dev->platdata;
struct stm32_usart *const usart = plat->base;
+
+#ifdef CONFIG_CLK
+ int ret;
+ struct clk clk;
+
+ 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;
+ }
+#endif
+
+ /* Disable usart-> disable overrun-> enable usart */
+ clrbits_le32(&usart->cr1, USART_CR1_RE | USART_CR1_TE | USART_CR1_UE);
+ setbits_le32(&usart->cr3, USART_CR3_OVRDIS);
setbits_le32(&usart->cr1, USART_CR1_RE | USART_CR1_TE | USART_CR1_UE);
return 0;
#if CONFIG_IS_ENABLED(OF_CONTROL)
static const struct udevice_id stm32_serial_id[] = {
- {.compatible = "st,stm32-usart"},
- {.compatible = "st,stm32-uart"},
+ {.compatible = "st,stm32f7-usart"},
+ {.compatible = "st,stm32f7-uart"},
{}
};
struct stm32x7_serial_platdata *plat = dev_get_platdata(dev);
fdt_addr_t addr;
- addr = dev_get_addr(dev);
+ addr = devfdt_get_addr(dev);
if (addr == FDT_ADDR_T_NONE)
return -EINVAL;
plat->base = (struct stm32_usart *)addr;
+
return 0;
}
#endif