/*
* (C) Copyright 2015
- * Kamil Lulko, <rev13@wp.pl>
+ * Kamil Lulko, <kamil.lulko@gmail.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
+#include <dm.h>
#include <asm/io.h>
#include <serial.h>
#include <asm/arch/stm32.h>
+#include <dm/platform_data/serial_stm32.h>
-/*
- * Set up the usart port
- */
-#if (CONFIG_STM32_USART >= 1) && (CONFIG_STM32_USART <= 6)
-#define USART_PORT (CONFIG_STM32_USART - 1)
-#else
-#define USART_PORT 0
-#endif
-/*
- * Set up the usart base address
- *
- * --STM32_USARTD_BASE means default setting
- */
-#define STM32_USART1_BASE (STM32_APB2PERIPH_BASE + 0x1000)
-#define STM32_USART2_BASE (STM32_APB1PERIPH_BASE + 0x4400)
-#define STM32_USART3_BASE (STM32_APB1PERIPH_BASE + 0x4800)
-#define STM32_USART6_BASE (STM32_APB2PERIPH_BASE + 0x1400)
-#define STM32_USARTD_BASE STM32_USART1_BASE
-/*
- * RCC USART specific definitions
- *
- * --RCC_ENR_USARTDEN means default setting
- */
-#define RCC_ENR_USART1EN (1 << 4)
-#define RCC_ENR_USART2EN (1 << 17)
-#define RCC_ENR_USART3EN (1 << 18)
-#define RCC_ENR_USART6EN (1 << 5)
-#define RCC_ENR_USARTDEN RCC_ENR_USART1EN
-
-struct stm32_serial {
+struct stm32_usart {
u32 sr;
u32 dr;
u32 brr;
u32 gtpr;
};
-#define USART_CR1_RE (1 << 2)
-#define USART_CR1_TE (1 << 3)
-#define USART_CR1_UE (1 << 13)
+#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_SR_FLAG_TXE (1 << 7)
-#define USART_BRR_F_MASK 0xF
+#define USART_BRR_F_MASK 0xF
#define USART_BRR_M_SHIFT 4
#define USART_BRR_M_MASK 0xFFF0
DECLARE_GLOBAL_DATA_PTR;
-static const unsigned long usart_base[] = {
- STM32_USART1_BASE,
- STM32_USART2_BASE,
- STM32_USART3_BASE,
- STM32_USARTD_BASE,
- STM32_USARTD_BASE,
- STM32_USART6_BASE
-};
+#define MAX_SERIAL_PORTS 4
-static const unsigned long rcc_enr_en[] = {
- RCC_ENR_USART1EN,
- RCC_ENR_USART2EN,
- RCC_ENR_USART3EN,
- RCC_ENR_USARTDEN,
- RCC_ENR_USARTDEN,
- RCC_ENR_USART6EN
+/*
+ * RCC USART specific definitions
+ */
+#define RCC_ENR_USART1EN (1 << 4)
+#define RCC_ENR_USART2EN (1 << 17)
+#define RCC_ENR_USART3EN (1 << 18)
+#define RCC_ENR_USART6EN (1 << 5)
+
+/* Array used to figure out which RCC bit needs to be set */
+static const unsigned long usart_port_rcc_pairs[MAX_SERIAL_PORTS][2] = {
+ { STM32_USART1_BASE, RCC_ENR_USART1EN },
+ { STM32_USART2_BASE, RCC_ENR_USART2EN },
+ { STM32_USART3_BASE, RCC_ENR_USART3EN },
+ { STM32_USART6_BASE, RCC_ENR_USART6EN }
};
-static void stm32_serial_setbrg(void)
+static int stm32_serial_setbrg(struct udevice *dev, int baudrate)
{
- serial_init();
-}
+ struct stm32_serial_platdata *plat = dev->platdata;
+ struct stm32_usart *const usart = plat->base;
+ u32 clock, int_div, frac_div, tmp;
-static int stm32_serial_init(void)
-{
- struct stm32_serial *usart =
- (struct stm32_serial *)usart_base[USART_PORT];
- u32 clock, int_div, frac_div, tmp;
-
- if ((usart_base[USART_PORT] & STM32_BUS_MASK) ==
- STM32_APB1PERIPH_BASE) {
- setbits_le32(&STM32_RCC->apb1enr, rcc_enr_en[USART_PORT]);
+ if (((u32)usart & STM32_BUS_MASK) == STM32_APB1PERIPH_BASE)
clock = clock_get(CLOCK_APB1);
- } else if ((usart_base[USART_PORT] & STM32_BUS_MASK) ==
- STM32_APB2PERIPH_BASE) {
- setbits_le32(&STM32_RCC->apb2enr, rcc_enr_en[USART_PORT]);
+ else if (((u32)usart & STM32_BUS_MASK) == STM32_APB2PERIPH_BASE)
clock = clock_get(CLOCK_APB2);
- } else {
- return -1;
- }
+ else
+ return -EINVAL;
- int_div = (25 * clock) / (4 * gd->baudrate);
+ 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);
- setbits_le32(&usart->cr1, USART_CR1_RE | USART_CR1_TE | USART_CR1_UE);
return 0;
}
-static int stm32_serial_getc(void)
+static int stm32_serial_getc(struct udevice *dev)
{
- struct stm32_serial *usart =
- (struct stm32_serial *)usart_base[USART_PORT];
- while ((readl(&usart->sr) & USART_SR_FLAG_RXNE) == 0)
- ;
+ struct stm32_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->dr);
}
-static void stm32_serial_putc(const char c)
+static int stm32_serial_putc(struct udevice *dev, const char c)
{
- struct stm32_serial *usart =
- (struct stm32_serial *)usart_base[USART_PORT];
+ struct stm32_serial_platdata *plat = dev->platdata;
+ struct stm32_usart *const usart = plat->base;
- if (c == '\n')
- stm32_serial_putc('\r');
+ if ((readl(&usart->sr) & USART_SR_FLAG_TXE) == 0)
+ return -EAGAIN;
- while ((readl(&usart->sr) & USART_SR_FLAG_TXE) == 0)
- ;
writel(c, &usart->dr);
+
+ return 0;
}
-static int stm32_serial_tstc(void)
+static int stm32_serial_pending(struct udevice *dev, bool input)
{
- struct stm32_serial *usart =
- (struct stm32_serial *)usart_base[USART_PORT];
- u8 ret;
+ struct stm32_serial_platdata *plat = dev->platdata;
+ struct stm32_usart *const usart = plat->base;
- ret = readl(&usart->sr) & USART_SR_FLAG_RXNE;
- return ret;
+ if (input)
+ return readl(&usart->sr) & USART_SR_FLAG_RXNE ? 1 : 0;
+ else
+ return readl(&usart->sr) & USART_SR_FLAG_TXE ? 0 : 1;
}
-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)
+static int stm32_serial_probe(struct udevice *dev)
{
- serial_register(&stm32_serial_drv);
-}
+ struct stm32_serial_platdata *plat = dev->platdata;
+ struct stm32_usart *const usart = plat->base;
+ int usart_port = -1;
+ int i;
+
+ for (i = 0; i < MAX_SERIAL_PORTS; i++) {
+ if ((u32)usart == usart_port_rcc_pairs[i][0]) {
+ usart_port = i;
+ break;
+ }
+ }
-__weak struct serial_device *default_serial_console(void)
-{
- return &stm32_serial_drv;
+ if (usart_port == -1)
+ return -EINVAL;
+
+ if (((u32)usart & STM32_BUS_MASK) == STM32_APB1PERIPH_BASE)
+ setbits_le32(&STM32_RCC->apb1enr,
+ usart_port_rcc_pairs[usart_port][1]);
+ else if (((u32)usart & STM32_BUS_MASK) == STM32_APB2PERIPH_BASE)
+ setbits_le32(&STM32_RCC->apb2enr,
+ usart_port_rcc_pairs[usart_port][1]);
+ else
+ return -EINVAL;
+
+ 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_stm32",
+ .id = UCLASS_SERIAL,
+ .ops = &stm32_serial_ops,
+ .probe = stm32_serial_probe,
+ .flags = DM_FLAG_PRE_RELOC,
+};
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