Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / serial / atmel_usart.c

diff --git a/qemu/roms/u-boot/drivers/serial/atmel_usart.c b/qemu/roms/u-boot/drivers/serial/atmel_usart.c
new file mode 100644 (file)
index 0000000..8f0e348
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/serial/atmel_usart.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2004-2006 Atmel Corporation
+ *
+ * Modified to support C structur SoC access by
+ * Andreas Bießmann <biessmann@corscience.de>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+#include <common.h>
+#include <watchdog.h>
+#include <serial.h>
+#include <linux/compiler.h>
+
+#include <asm/io.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/hardware.h>
+
+#include "atmel_usart.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static void atmel_serial_setbrg(void)
+{
+       atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+       unsigned long divisor;
+       unsigned long usart_hz;
+
+       /*
+        *              Master Clock
+        * Baud Rate = --------------
+        *                16 * CD
+        */
+       usart_hz = get_usart_clk_rate(CONFIG_USART_ID);
+       divisor = (usart_hz / 16 + gd->baudrate / 2) / gd->baudrate;
+       writel(USART3_BF(CD, divisor), &usart->brgr);
+}
+
+static int atmel_serial_init(void)
+{
+       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();
+
+       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)),
+                          &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;
+}
+
+static void atmel_serial_putc(char c)
+{
+       atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+
+       if (c == '\n')
+               serial_putc('\r');
+
+       while (!(readl(&usart->csr) & USART3_BIT(TXRDY)));
+       writel(c, &usart->thr);
+}
+
+static int atmel_serial_getc(void)
+{
+       atmel_usart3_t *usart = (atmel_usart3_t *)CONFIG_USART_BASE;
+
+       while (!(readl(&usart->csr) & USART3_BIT(RXRDY)))
+                WATCHDOG_RESET();
+       return readl(&usart->rhr);
+}
+
+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;
+}