blackfin: the sclk MHz in i2c driver should be divided by 1000 other than 1024

[karo-tx-uboot.git] / drivers / serial / atmel_usart.c

diff --git a/drivers/serial/atmel_usart.c b/drivers/serial/atmel_usart.c
index f35b99730f786528de863802191a1f11e2cd3846..8f0e3489a0e59287c60a2e3b34cc1fdc69eb91d7 100644 (file)
--- a/drivers/serial/atmel_usart.c
+++ b/drivers/serial/atmel_usart.c
@@ -1,47 +1,27 @@
 /*
  * 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;
 
@@ -50,51 +30,82 @@ void serial_setbrg(void)
         * 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;
+}