beaglebone: initial Kconfig and Makefiles

Initial structure of Beaglebone port

Change-Id: Ia255ab207f424dcd525990cdc0d74953e012c087
Signed-off-by: David Hendricks <dhendrix@chromium.org>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3279
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

1 files changed, 137 insertions, 0 deletions

diff --git a/src/cpu/ti/am335x/uart.c b/src/cpu/ti/am335x/uart.c
new file mode 100644
index 0000000000..fdf5c05908
--- /dev/null
+++ b/src/cpu/ti/am335x/uart.c
@@ -0,0 +1,137 @@
+/*
+ * (C) Copyright 2009 SAMSUNG Electronics
+ * Minkyu Kang <mk7.kang@samsung.com>
+ * Heungjun Kim <riverful.kim@samsung.com>
+ *
+ * based on drivers/serial/s3c64xx.c
+ *
+ * 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
+ *
+ */
+
+#include <types.h>
+#include <uart.h>
+#include <arch/io.h>
+
+#include <console/console.h>	/* for __console definition */
+
+#include <cpu/ti/am335x/uart.h>
+
+#define RX_FIFO_COUNT_MASK	0xff
+#define RX_FIFO_FULL_MASK	(1 << 8)
+#define TX_FIFO_FULL_MASK	(1 << 24)
+
+/*
+ * Initialise the serial port with the given baudrate. The settings
+ * are always 8 data bits, no parity, 1 stop bit, no start bits.
+ */
+static void am335x_uart_init_dev(void)
+{
+	/* FIXME: implement this
+	 * ref: section 19.4.1.1.1 for reset
+	 * ref: section 19.4.1.1.2 for FIFO, skip DMA
+	 * ref: section 19.4.1.1.3 for baud rate, skip
+	 *      interrupts and protocol stuff.
+	 * */
+#if 0
+	struct s5p_uart *uart = (struct s5p_uart *)base_port;
+
+	// TODO initialize with correct peripheral id by base_port.
+	exynos_pinmux_config(PERIPH_ID_UART3, PINMUX_FLAG_NONE);
+
+	/* enable FIFOs */
+	writel(0x1, &uart->ufcon);
+	writel(0, &uart->umcon);
+	/* 8N1 */
+	writel(0x3, &uart->ulcon);
+	/* No interrupts, no DMA, pure polling */
+	writel(0x245, &uart->ucon);
+
+	serial_setbrg_dev();
+#endif
+}
+
+/*
+ * Read a single byte from the serial port. Returns 1 on success, 0
+ * otherwise. When the function is succesfull, the character read is
+ * written into its argument c.
+ */
+static unsigned char am335x_uart_rx_byte(void)
+{
+	/* FIXME: stub */
+#if 0
+	struct s5p_uart *uart = (struct s5p_uart *)base_port;
+
+	/* wait for character to arrive */
+	while (!(readl(&uart->ufstat) & (RX_FIFO_COUNT_MASK |
+					 RX_FIFO_FULL_MASK))) {
+		if (exynos5_uart_err_check(0))
+			return 0;
+	}
+
+	return readb(&uart->urxh) & 0xff;
+#endif
+	return 0xaa;
+}
+
+/*
+ * Output a single byte to the serial port.
+ */
+static void am335x_uart_tx_byte(unsigned char data)
+{
+	/* FIXME: stub */
+#if 0
+	struct s5p_uart *uart = (struct s5p_uart *)base_port;
+
+	/* wait for room in the tx FIFO */
+	while ((readl(&uart->ufstat) & TX_FIFO_FULL_MASK)) {
+		if (exynos5_uart_err_check(1))
+			return;
+	}
+
+	writeb(data, &uart->utxh);
+#endif
+}
+
+uint32_t uartmem_getbaseaddr(void)
+{
+	return CONFIG_CONSOLE_SERIAL_UART_ADDRESS;
+}
+
+#if !defined(__PRE_RAM__)
+static const struct console_driver exynos5_uart_console __console = {
+	.init     = am335x_uart_init_dev,
+	.tx_byte  = am335x_uart_tx_byte,
+	.rx_byte  = am335x_uart_rx_byte,
+};
+#else
+void uart_init(void)
+{
+	am335x_uart_init_dev();
+}
+
+unsigned char uart_rx_byte(void)
+{
+	return am335x_uart_rx_byte();
+}
+
+void uart_tx_byte(unsigned char data)
+{
+	am335x_uart_tx_byte(data);
+}
+
+void uart_tx_flush(void) {
+}
+#endif