/*
* Copyright (C) 2004-2006 Atmel Corporation
*
- * 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.
+ * Modified to support C structur SoC access by
+ * Andreas Bießmann <biessmann@corscience.de>
*
- * 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 <watchdog.h>
+#include <serial.h>
+#include <linux/compiler.h>
-#ifdef CONFIG_ATMEL_USART
#include <asm/io.h>
#include <asm/arch/clk.h>
-#include <asm/arch/memory-map.h>
-
-#if defined(CONFIG_USART0)
-# define USART_ID 0
-# define USART_BASE USART0_BASE
-#elif defined(CONFIG_USART1)
-# define USART_ID 1
-# define USART_BASE USART1_BASE
-#elif defined(CONFIG_USART2)
-# define USART_ID 2
-# define USART_BASE USART2_BASE
-#elif defined(CONFIG_USART3)
-# define USART_ID 3
-# define USART_BASE USART3_BASE
-#endif
+#include <asm/arch/hardware.h>
#include "atmel_usart.h"
DECLARE_GLOBAL_DATA_PTR;
-void serial_setbrg(void)
+static void atmel_serial_setbrg(void)
{
+ 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(USART_ID);
+ usart_hz = get_usart_clk_rate(CONFIG_USART_ID);
divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate;
- usart3_writel(BRGR, USART3_BF(CD, divisor));
+ writel(USART3_BF(CD, divisor), &usart->brgr);
}
-int serial_init(void)
+static int atmel_serial_init(void)
{
- usart3_writel(CR, USART3_BIT(RSTRX) | USART3_BIT(RSTTX));
+ atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+
+ /*
+ * Just in case: drain transmitter register
+ * 1000us is enough for baudrate >= 9600
+ */
+ if (!(readl(&usart->csr) & USART3_BIT(TXEMPTY)))
+ __udelay(1000);
+
+ writel(USART3_BIT(RSTRX) | USART3_BIT(RSTTX), &usart->cr);
serial_setbrg();
- usart3_writel(CR, USART3_BIT(RXEN) | USART3_BIT(TXEN));
- usart3_writel(MR, (USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL)
+ writel((USART3_BF(USART_MODE, USART3_USART_MODE_NORMAL)
| USART3_BF(USCLKS, USART3_USCLKS_MCK)
| USART3_BF(CHRL, USART3_CHRL_8)
| USART3_BF(PAR, USART3_PAR_NONE)
- | USART3_BF(NBSTOP, USART3_NBSTOP_1)));
+ | USART3_BF(NBSTOP, USART3_NBSTOP_1)),
+ &usart->mr);
+ writel(USART3_BIT(RXEN) | USART3_BIT(TXEN), &usart->cr);
+ /* 100us is enough for the new settings to be settled */
+ __udelay(100);
return 0;
}
-void serial_putc(char c)
+static void atmel_serial_putc(char c)
{
+ atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+
if (c == '\n')
serial_putc('\r');
- while (!(usart3_readl(CSR) & USART3_BIT(TXRDY))) ;
- usart3_writel(THR, c);
+ while (!(readl(&usart->csr) & USART3_BIT(TXRDY)));
+ writel(c, &usart->thr);
}
-void serial_puts(const char *s)
+static int atmel_serial_getc(void)
{
- while (*s)
- serial_putc(*s++);
+ atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+
+ while (!(readl(&usart->csr) & USART3_BIT(RXRDY)))
+ WATCHDOG_RESET();
+ return readl(&usart->rhr);
}
-int serial_getc(void)
+static int atmel_serial_tstc(void)
{
- while (!(usart3_readl(CSR) & USART3_BIT(RXRDY))) ;
- return usart3_readl(RHR);
+ atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+ return (readl(&usart->csr) & USART3_BIT(RXRDY)) != 0;
}
-int serial_tstc(void)
+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)
{
- return (usart3_readl(CSR) & USART3_BIT(RXRDY)) != 0;
+ serial_register(&atmel_serial_drv);
}
-#endif /* CONFIG_ATMEL_USART */
+__weak struct serial_device *default_serial_console(void)
+{
+ return &atmel_serial_drv;
+}