libpayload: serial: Move the depthcharge serial drivers into libpayload.

These drivers need to be ready right away and never really fit into the
depthcharge driver model anyway.

CQ-DEPEND=CL:194063
BUG=None
TEST=Built and booted on nyan and peach_pit. Built for nyan_big, nyan_blaze,
and daisy.
BRANCH=None

Original-Change-Id: I9570dee53c57d42ef4cd956f66a878ce39a2dc20
Original-Signed-off-by: Gabe Black <gabeblack@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/194057
Original-Reviewed-by: Gabe Black <gabeblack@chromium.org>
Original-Commit-Queue: Gabe Black <gabeblack@chromium.org>
Original-Tested-by: Gabe Black <gabeblack@chromium.org>
(cherry picked from commit 26e18f680c93fc990a3d1057c164f19859634a9f)
Signed-off-by: Marc Jones <marc.jones@se-eng.com>

Change-Id: Ia2233e2bd821d8de8d2d57a9423aeb74be7efd93
Reviewed-on: http://review.coreboot.org/7224
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Tested-by: build bot (Jenkins)

payloads/libpayload/drivers/serial/s5p.c

@@ -0,0 +1,106 @@
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <libpayload.h>
+#include <stdint.h>
+
+struct s5p_uart
+{
+	uint32_t ulcon;		// line control
+	uint32_t ucon;		// control
+	uint32_t ufcon;		// FIFO control
+	uint32_t umcon;		// modem control
+	uint32_t utrstat;	// Tx/Rx status
+	uint32_t uerstat;	// Rx error status
+	uint32_t ufstat;	// FIFO status
+	uint32_t umstat;	// modem status
+	uint32_t utxh;		// transmit buffer
+	uint32_t urxh;		// receive buffer
+	uint32_t ubrdiv;	// baud rate divisor
+	uint32_t ufracval;	// divisor fractional value
+	uint32_t uintp;		// interrupt pending
+	uint32_t uints;		// interrupt source
+	uint32_t uintm;		// interrupt mask
+};
+
+static struct s5p_uart *uart_regs;
+
+void serial_putchar(unsigned int c)
+{
+	const uint32_t TxFifoFullBit = (0x1 << 24);
+
+	while (readl(&uart_regs->ufstat) & TxFifoFullBit)
+	{;}
+
+	writeb(c, &uart_regs->utxh);
+	if (c == '\n')
+		serial_putchar('\r');
+}
+
+int serial_havechar(void)
+{
+	const uint32_t DataReadyMask = (0xf << 0) | (0x1 << 8);
+
+	return (readl(&uart_regs->ufstat) & DataReadyMask) != 0;
+}
+
+int serial_getchar(void)
+{
+	while (!serial_havechar())
+	{;}
+
+	return readb(&uart_regs->urxh);
+}
+
+static struct console_output_driver s5p_serial_output =
+{
+	.putchar = &serial_putchar
+};
+
+static struct console_input_driver s5p_serial_input =
+{
+	.havekey = &serial_havechar,
+	.getchar = &serial_getchar
+};
+
+void serial_init(void)
+{
+	if (!lib_sysinfo.serial || !lib_sysinfo.serial->baseaddr)
+		return;
+
+	uart_regs = (struct s5p_uart *)lib_sysinfo.serial->baseaddr;
+}
+
+void serial_console_init(void)
+{
+	serial_init();
+
+	if (uart_regs) {
+		console_add_output_driver(&s5p_serial_output);
+		console_add_input_driver(&s5p_serial_input);
+	}
+}