mirror of
https://github.com/Fishwaldo/u-boot.git
synced 2025-03-18 21:21:37 +00:00
serial: atmel_usart: Add clk support
Add the clock support. Note that the clock handling of the DBGU peripheral is different from the USART. Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com> Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
parent
5f29e79915
commit
f8b7fff1d5
1 changed files with 49 additions and 3 deletions
|
@ -7,6 +7,7 @@
|
||||||
* SPDX-License-Identifier: GPL-2.0+
|
* SPDX-License-Identifier: GPL-2.0+
|
||||||
*/
|
*/
|
||||||
#include <common.h>
|
#include <common.h>
|
||||||
|
#include <clk.h>
|
||||||
#include <dm.h>
|
#include <dm.h>
|
||||||
#include <errno.h>
|
#include <errno.h>
|
||||||
#include <watchdog.h>
|
#include <watchdog.h>
|
||||||
|
@ -133,9 +134,14 @@ __weak struct serial_device *default_serial_console(void)
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
#ifdef CONFIG_DM_SERIAL
|
#ifdef CONFIG_DM_SERIAL
|
||||||
|
enum serial_clk_type {
|
||||||
|
CLK_TYPE_NORMAL = 0,
|
||||||
|
CLK_TYPE_DBGU,
|
||||||
|
};
|
||||||
|
|
||||||
struct atmel_serial_priv {
|
struct atmel_serial_priv {
|
||||||
atmel_usart3_t *usart;
|
atmel_usart3_t *usart;
|
||||||
|
ulong usart_clk_rate;
|
||||||
};
|
};
|
||||||
|
|
||||||
static void _atmel_serial_set_brg(atmel_usart3_t *usart,
|
static void _atmel_serial_set_brg(atmel_usart3_t *usart,
|
||||||
|
@ -168,7 +174,7 @@ int atmel_serial_setbrg(struct udevice *dev, int baudrate)
|
||||||
{
|
{
|
||||||
struct atmel_serial_priv *priv = dev_get_priv(dev);
|
struct atmel_serial_priv *priv = dev_get_priv(dev);
|
||||||
|
|
||||||
_atmel_serial_set_brg(priv->usart, get_usart_clk_rate(0), baudrate);
|
_atmel_serial_set_brg(priv->usart, priv->usart_clk_rate, baudrate);
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
@ -213,10 +219,39 @@ static const struct dm_serial_ops atmel_serial_ops = {
|
||||||
.setbrg = atmel_serial_setbrg,
|
.setbrg = atmel_serial_setbrg,
|
||||||
};
|
};
|
||||||
|
|
||||||
|
static int atmel_serial_enable_clk(struct udevice *dev)
|
||||||
|
{
|
||||||
|
struct atmel_serial_priv *priv = dev_get_priv(dev);
|
||||||
|
struct clk clk;
|
||||||
|
ulong clk_rate;
|
||||||
|
int ret;
|
||||||
|
|
||||||
|
ret = clk_get_by_index(dev, 0, &clk);
|
||||||
|
if (ret)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
if (dev_get_driver_data(dev) == CLK_TYPE_NORMAL) {
|
||||||
|
ret = clk_enable(&clk);
|
||||||
|
if (ret)
|
||||||
|
return ret;
|
||||||
|
}
|
||||||
|
|
||||||
|
clk_rate = clk_get_rate(&clk);
|
||||||
|
if (!clk_rate)
|
||||||
|
return -EINVAL;
|
||||||
|
|
||||||
|
priv->usart_clk_rate = clk_rate;
|
||||||
|
|
||||||
|
clk_free(&clk);
|
||||||
|
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
static int atmel_serial_probe(struct udevice *dev)
|
static int atmel_serial_probe(struct udevice *dev)
|
||||||
{
|
{
|
||||||
struct atmel_serial_platdata *plat = dev->platdata;
|
struct atmel_serial_platdata *plat = dev->platdata;
|
||||||
struct atmel_serial_priv *priv = dev_get_priv(dev);
|
struct atmel_serial_priv *priv = dev_get_priv(dev);
|
||||||
|
int ret;
|
||||||
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
||||||
fdt_addr_t addr_base;
|
fdt_addr_t addr_base;
|
||||||
|
|
||||||
|
@ -228,14 +263,25 @@ static int atmel_serial_probe(struct udevice *dev)
|
||||||
#endif
|
#endif
|
||||||
priv->usart = (atmel_usart3_t *)plat->base_addr;
|
priv->usart = (atmel_usart3_t *)plat->base_addr;
|
||||||
|
|
||||||
_atmel_serial_init(priv->usart, get_usart_clk_rate(0), gd->baudrate);
|
ret = atmel_serial_enable_clk(dev);
|
||||||
|
if (ret)
|
||||||
|
return ret;
|
||||||
|
|
||||||
|
_atmel_serial_init(priv->usart, priv->usart_clk_rate, gd->baudrate);
|
||||||
|
|
||||||
return 0;
|
return 0;
|
||||||
}
|
}
|
||||||
|
|
||||||
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
#if CONFIG_IS_ENABLED(OF_CONTROL)
|
||||||
static const struct udevice_id atmel_serial_ids[] = {
|
static const struct udevice_id atmel_serial_ids[] = {
|
||||||
{ .compatible = "atmel,at91sam9260-usart" },
|
{
|
||||||
|
.compatible = "atmel,at91sam9260-dbgu",
|
||||||
|
.data = CLK_TYPE_DBGU,
|
||||||
|
},
|
||||||
|
{
|
||||||
|
.compatible = "atmel,at91sam9260-usart",
|
||||||
|
.data = CLK_TYPE_NORMAL,
|
||||||
|
},
|
||||||
{ }
|
{ }
|
||||||
};
|
};
|
||||||
#endif
|
#endif
|
||||||
|
|
Loading…
Add table
Reference in a new issue