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-rw-r--r--drivers/serial/atmel_usart.c116
-rw-r--r--drivers/serial/serial-uclass.c77
-rw-r--r--drivers/serial/serial_tegra.c16
3 files changed, 197 insertions, 12 deletions
diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c
index 8f0e348..4fe992b 100644
--- a/drivers/serial/atmel_usart.c
+++ b/drivers/serial/atmel_usart.c
@@ -7,11 +7,16 @@
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
+#include <dm.h>
+#include <errno.h>
#include <watchdog.h>
#include <serial.h>
#include <linux/compiler.h>
#include <asm/io.h>
+#ifdef CONFIG_DM_SERIAL
+#include <asm/arch/atmel_serial.h>
+#endif
#include <asm/arch/clk.h>
#include <asm/arch/hardware.h>
@@ -19,9 +24,9 @@
DECLARE_GLOBAL_DATA_PTR;
-static void atmel_serial_setbrg(void)
+static void atmel_serial_setbrg_internal(atmel_usart3_t *usart, int id,
+ int baudrate)
{
- atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
unsigned long divisor;
unsigned long usart_hz;
@@ -30,15 +35,13 @@ static void atmel_serial_setbrg(void)
* Baud Rate = --------------
* 16 * CD
*/
- usart_hz = get_usart_clk_rate(CONFIG_USART_ID);
- divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate;
+ usart_hz = get_usart_clk_rate(id);
+ divisor = (usart_hz / 16 + baudrate / 2) / baudrate;
writel(USART3_BF(CD, divisor), &usart->brgr);
}
-static int atmel_serial_init(void)
+static void atmel_serial_init_internal(atmel_usart3_t *usart)
{
- atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
-
/*
* Just in case: drain transmitter register
* 1000us is enough for baudrate >= 9600
@@ -47,9 +50,10 @@ static int atmel_serial_init(void)
__udelay(1000);
writel(USART3_BIT(RSTRX) | USART3_BIT(RSTTX), &usart->cr);
+}
- serial_setbrg();
-
+static void atmel_serial_activate(atmel_usart3_t *usart)
+{
writel((USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL)
| USART3_BF(USCLKS, USART3_USCLKS_MCK)
| USART3_BF(CHRL, USART3_CHRL_8)
@@ -59,6 +63,22 @@ static int atmel_serial_init(void)
writel(USART3_BIT(RXEN) | USART3_BIT(TXEN), &usart->cr);
/* 100us is enough for the new settings to be settled */
__udelay(100);
+}
+
+#ifndef CONFIG_DM_SERIAL
+static void atmel_serial_setbrg(void)
+{
+ atmel_serial_setbrg_internal((atmel_usart3_t *)CONFIG_USART_BASE,
+ CONFIG_USART_ID, gd->baudrate);
+}
+
+static int atmel_serial_init(void)
+{
+ atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+
+ atmel_serial_init_internal(usart);
+ serial_setbrg();
+ atmel_serial_activate(usart);
return 0;
}
@@ -109,3 +129,81 @@ __weak struct serial_device *default_serial_console(void)
{
return &atmel_serial_drv;
}
+#endif
+
+#ifdef CONFIG_DM_SERIAL
+
+struct atmel_serial_priv {
+ atmel_usart3_t *usart;
+};
+
+int atmel_serial_setbrg(struct udevice *dev, int baudrate)
+{
+ struct atmel_serial_priv *priv = dev_get_priv(dev);
+
+ atmel_serial_setbrg_internal(priv->usart, 0 /* ignored */, baudrate);
+ atmel_serial_activate(priv->usart);
+
+ return 0;
+}
+
+static int atmel_serial_getc(struct udevice *dev)
+{
+ struct atmel_serial_priv *priv = dev_get_priv(dev);
+
+ if (!(readl(&priv->usart->csr) & USART3_BIT(RXRDY)))
+ return -EAGAIN;
+
+ return readl(&priv->usart->rhr);
+}
+
+static int atmel_serial_putc(struct udevice *dev, const char ch)
+{
+ struct atmel_serial_priv *priv = dev_get_priv(dev);
+
+ if (!(readl(&priv->usart->csr) & USART3_BIT(TXRDY)))
+ return -EAGAIN;
+
+ writel(ch, &priv->usart->thr);
+
+ return 0;
+}
+
+static int atmel_serial_pending(struct udevice *dev, bool input)
+{
+ struct atmel_serial_priv *priv = dev_get_priv(dev);
+ uint32_t csr = readl(&priv->usart->csr);
+
+ if (input)
+ return csr & USART3_BIT(RXRDY) ? 1 : 0;
+ else
+ return csr & USART3_BIT(TXEMPTY) ? 0 : 1;
+}
+
+static const struct dm_serial_ops atmel_serial_ops = {
+ .putc = atmel_serial_putc,
+ .pending = atmel_serial_pending,
+ .getc = atmel_serial_getc,
+ .setbrg = atmel_serial_setbrg,
+};
+
+static int atmel_serial_probe(struct udevice *dev)
+{
+ struct atmel_serial_platdata *plat = dev->platdata;
+ struct atmel_serial_priv *priv = dev_get_priv(dev);
+
+ priv->usart = (atmel_usart3_t *)plat->base_addr;
+ atmel_serial_init_internal(priv->usart);
+
+ return 0;
+}
+
+U_BOOT_DRIVER(serial_atmel) = {
+ .name = "serial_atmel",
+ .id = UCLASS_SERIAL,
+ .probe = atmel_serial_probe,
+ .ops = &atmel_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
+ .priv_auto_alloc_size = sizeof(struct atmel_serial_priv),
+};
+#endif
diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c
index 0f019c8..b09053f 100644
--- a/drivers/serial/serial-uclass.c
+++ b/drivers/serial/serial-uclass.c
@@ -6,6 +6,7 @@
#include <common.h>
#include <dm.h>
+#include <environment.h>
#include <errno.h>
#include <fdtdec.h>
#include <os.h>
@@ -19,6 +20,11 @@
DECLARE_GLOBAL_DATA_PTR;
+/*
+ * Table with supported baudrates (defined in config_xyz.h)
+ */
+static const unsigned long baudrate_table[] = CONFIG_SYS_BAUDRATE_TABLE;
+
#ifndef CONFIG_SYS_MALLOC_F_LEN
#error "Serial is required before relocation - define CONFIG_SYS_MALLOC_F_LEN to make this work"
#endif
@@ -160,10 +166,12 @@ void serial_stdio_init(void)
{
}
+#ifdef CONFIG_DM_STDIO
static void serial_stub_putc(struct stdio_dev *sdev, const char ch)
{
_serial_putc(sdev->priv, ch);
}
+#endif
void serial_stub_puts(struct stdio_dev *sdev, const char *str)
{
@@ -180,11 +188,74 @@ int serial_stub_tstc(struct stdio_dev *sdev)
return _serial_tstc(sdev->priv);
}
+/**
+ * on_baudrate() - Update the actual baudrate when the env var changes
+ *
+ * This will check for a valid baudrate and only apply it if valid.
+ */
+static int on_baudrate(const char *name, const char *value, enum env_op op,
+ int flags)
+{
+ int i;
+ int baudrate;
+
+ switch (op) {
+ case env_op_create:
+ case env_op_overwrite:
+ /*
+ * Switch to new baudrate if new baudrate is supported
+ */
+ baudrate = simple_strtoul(value, NULL, 10);
+
+ /* Not actually changing */
+ if (gd->baudrate == baudrate)
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(baudrate_table); ++i) {
+ if (baudrate == baudrate_table[i])
+ break;
+ }
+ if (i == ARRAY_SIZE(baudrate_table)) {
+ if ((flags & H_FORCE) == 0)
+ printf("## Baudrate %d bps not supported\n",
+ baudrate);
+ return 1;
+ }
+ if ((flags & H_INTERACTIVE) != 0) {
+ printf("## Switch baudrate to %d bps and press ENTER ...\n",
+ baudrate);
+ udelay(50000);
+ }
+
+ gd->baudrate = baudrate;
+
+ serial_setbrg();
+
+ udelay(50000);
+
+ if ((flags & H_INTERACTIVE) != 0)
+ while (1) {
+ if (getc() == '\r')
+ break;
+ }
+
+ return 0;
+ case env_op_delete:
+ printf("## Baudrate may not be deleted\n");
+ return 1;
+ default:
+ return 0;
+ }
+}
+U_BOOT_ENV_CALLBACK(baudrate, on_baudrate);
+
static int serial_post_probe(struct udevice *dev)
{
- struct stdio_dev sdev;
struct dm_serial_ops *ops = serial_get_ops(dev);
+#ifdef CONFIG_DM_STDIO
struct serial_dev_priv *upriv = dev->uclass_priv;
+ struct stdio_dev sdev;
+#endif
int ret;
/* Set the baud rate */
@@ -194,9 +265,9 @@ static int serial_post_probe(struct udevice *dev)
return ret;
}
+#ifdef CONFIG_DM_STDIO
if (!(gd->flags & GD_FLG_RELOC))
return 0;
-
memset(&sdev, '\0', sizeof(sdev));
strncpy(sdev.name, dev->name, sizeof(sdev.name));
@@ -207,7 +278,7 @@ static int serial_post_probe(struct udevice *dev)
sdev.getc = serial_stub_getc;
sdev.tstc = serial_stub_tstc;
stdio_register_dev(&sdev, &upriv->sdev);
-
+#endif
return 0;
}
diff --git a/drivers/serial/serial_tegra.c b/drivers/serial/serial_tegra.c
index 7eb70e1..b9227f0 100644
--- a/drivers/serial/serial_tegra.c
+++ b/drivers/serial/serial_tegra.c
@@ -9,6 +9,7 @@
#include <ns16550.h>
#include <serial.h>
+#ifdef CONFIG_OF_CONTROL
static const struct udevice_id tegra_serial_ids[] = {
{ .compatible = "nvidia,tegra20-uart" },
{ }
@@ -26,13 +27,28 @@ static int tegra_serial_ofdata_to_platdata(struct udevice *dev)
return 0;
}
+#else
+struct ns16550_platdata tegra_serial = {
+ .base = CONFIG_SYS_NS16550_COM1,
+ .reg_shift = 2,
+ .clock = V_NS16550_CLK,
+};
+
+U_BOOT_DEVICE(ns16550_serial) = {
+ "serial_tegra20", &tegra_serial
+};
+#endif
+
U_BOOT_DRIVER(serial_ns16550) = {
.name = "serial_tegra20",
.id = UCLASS_SERIAL,
+#ifdef CONFIG_OF_CONTROL
.of_match = tegra_serial_ids,
.ofdata_to_platdata = tegra_serial_ofdata_to_platdata,
.platdata_auto_alloc_size = sizeof(struct ns16550_platdata),
+#endif
.priv_auto_alloc_size = sizeof(struct NS16550),
.probe = ns16550_serial_probe,
.ops = &ns16550_serial_ops,
+ .flags = DM_FLAG_PRE_RELOC,
};
generated by cgit v1.1 at 2024-11-23 09:07:23 +0000