* Modified to support C structur SoC access by
* Andreas Bießmann <biessmann@corscience.de>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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>
DECLARE_GLOBAL_DATA_PTR;
-void 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;
* 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);
}
-int 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
__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)
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;
}
-void serial_putc(char c)
+static void atmel_serial_putc(char c)
{
atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
writel(c, &usart->thr);
}
-void serial_puts(const char *s)
-{
- while (*s)
- serial_putc(*s++);
-}
-
-int serial_getc(void)
+static int atmel_serial_getc(void)
{
atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
return readl(&usart->rhr);
}
-int serial_tstc(void)
+static int atmel_serial_tstc(void)
{
atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
return (readl(&usart->csr) & USART3_BIT(RXRDY)) != 0;
}
+
+static struct serial_device atmel_serial_drv = {
+ .name = "atmel_serial",
+ .start = atmel_serial_init,
+ .stop = NULL,
+ .setbrg = atmel_serial_setbrg,
+ .putc = atmel_serial_putc,
+ .puts = default_serial_puts,
+ .getc = atmel_serial_getc,
+ .tstc = atmel_serial_tstc,
+};
+
+void atmel_serial_initialize(void)
+{
+ serial_register(&atmel_serial_drv);
+}
+
+__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
projects / karo-tx-uboot.git / blobdiff