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serial: atmel_usart: Add clk support

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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:
Wenyou Yang 2017-04-14 15:01:28 +08:00 • committed by Simon Glass
parent 5f29e79915
commit f8b7fff1d5
1 changed files with 49 additions and 3 deletions
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52
drivers/serial/atmel_usart.c
View file

@ -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