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)

3 files changed, 462 insertions, 0 deletions

diff --git a/payloads/libpayload/drivers/serial/8250.c b/payloads/libpayload/drivers/serial/8250.c
new file mode 100644
index 0000000000..a4c1b1a2ab
--- /dev/null
+++ b/payloads/libpayload/drivers/serial/8250.c
@@ -0,0 +1,245 @@
+/*
+ * This file is part of the libpayload project.
+ *
+ * Copyright (C) 2008 Advanced Micro Devices, Inc.
+ * Copyright (C) 2008 Ulf Jordan <jordan@chalmers.se>
+ *
+ * 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-config.h>
+#include <libpayload.h>
+
+#define IOBASE lib_sysinfo.serial->baseaddr
+#define MEMBASE (phys_to_virt(IOBASE))
+
+static int serial_hardware_is_present = 0;
+static int serial_is_mem_mapped = 0;
+
+static uint8_t serial_read_reg(int offset)
+{
+#ifdef CONFIG_LP_IO_ADDRESS_SPACE
+	if (!serial_is_mem_mapped)
+		return inb(IOBASE + offset);
+	else
+#endif
+		return readb(MEMBASE + offset);
+}
+
+static void serial_write_reg(uint8_t val, int offset)
+{
+#ifdef CONFIG_LP_IO_ADDRESS_SPACE
+	if (!serial_is_mem_mapped)
+		outb(val, IOBASE + offset);
+	else
+#endif
+		writeb(val, MEMBASE + offset);
+}
+
+#ifdef CONFIG_LP_SERIAL_SET_SPEED
+static void serial_hardware_init(int speed, int word_bits,
+				 int parity, int stop_bits)
+{
+	unsigned char reg;
+
+	/* Disable interrupts. */
+	serial_write_reg(0, 0x01);
+
+	/* Assert RTS and DTR. */
+	serial_write_reg(3, 0x04);
+
+	/* Set the divisor latch. */
+	reg = serial_read_reg(0x03);
+	serial_write_reg(reg | 0x80, 0x03);
+
+	/* Write the divisor. */
+	uint16_t divisor = 115200 / speed;
+	serial_write_reg(divisor & 0xFF, 0x00);
+	serial_write_reg(divisor >> 8, 0x01);
+
+	/* Restore the previous value of the divisor.
+	 * And set 8 bits per character */
+	serial_write_reg((reg & ~0x80) | 3, 0x03);
+}
+#endif
+
+static struct console_input_driver consin = {
+	.havekey = &serial_havechar,
+	.getchar = &serial_getchar
+};
+
+static struct console_output_driver consout = {
+	.putchar = &serial_putchar
+};
+
+void serial_init(void)
+{
+	if (!lib_sysinfo.serial)
+		return;
+
+	serial_is_mem_mapped =
+		(lib_sysinfo.serial->type == CB_SERIAL_TYPE_MEMORY_MAPPED);
+
+	if (!serial_is_mem_mapped) {
+#ifdef CONFIG_LP_IO_ADDRESS_SPACE
+		if ((inb(IOBASE + 0x05) == 0xFF) &&
+				(inb(IOBASE + 0x06) == 0xFF)) {
+			printf("IO space mapped serial not present.");
+			return;
+		}
+#else
+		printf("IO space mapped serial not supported.");
+		return;
+#endif
+	}
+
+#ifdef CONFIG_LP_SERIAL_SET_SPEED
+	serial_hardware_init(CONFIG_LP_SERIAL_BAUD_RATE, 8, 0, 1);
+#endif
+}
+
+void serial_console_init(void)
+{
+	if (!lib_sysinfo.serial)
+		return;
+
+	serial_init();
+
+	console_add_input_driver(&consin);
+	console_add_output_driver(&consout);
+	serial_hardware_is_present = 1;
+}
+
+void serial_putchar(unsigned int c)
+{
+	if (!serial_hardware_is_present)
+		return;
+	while ((serial_read_reg(0x05) & 0x20) == 0) ;
+	serial_write_reg(c, 0x00);
+}
+
+int serial_havechar(void)
+{
+	if (!serial_hardware_is_present)
+		return 0;
+	return serial_read_reg(0x05) & 0x01;
+}
+
+int serial_getchar(void)
+{
+	if (!serial_hardware_is_present)
+		return -1;
+	while (!serial_havechar()) ;
+	return serial_read_reg(0x00);
+}
+
+/*  These are thinly veiled vt100 functions used by curses */
+
+#define VT100_CLEAR       "\e[H\e[J"
+/* These defines will fail if you use bold and reverse at the same time.
+ * Switching off one of them will switch off both. tinycurses knows about
+ * this and does the right thing.
+ */
+#define VT100_SBOLD       "\e[1m"
+#define VT100_EBOLD       "\e[m"
+#define VT100_SREVERSE    "\e[7m"
+#define VT100_EREVERSE    "\e[m"
+#define VT100_CURSOR_ADDR "\e[%d;%dH"
+#define VT100_CURSOR_ON   "\e[?25l"
+#define VT100_CURSOR_OFF  "\e[?25h"
+/* The following smacs/rmacs are actually for xterm; a real vt100 has
+   enacs=\E(B\E)0, smacs=^N, rmacs=^O.  */
+#define VT100_SMACS       "\e(0"
+#define VT100_RMACS       "\e(B"
+/* A vt100 doesn't do color, setaf/setab below are from xterm-color. */
+#define VT100_SET_COLOR   "\e[3%d;4%dm"
+
+static void serial_putcmd(const char *str)
+{
+	while (*str)
+		serial_putchar(*(str++));
+}
+
+void serial_clear(void)
+{
+	serial_putcmd(VT100_CLEAR);
+}
+
+void serial_start_bold(void)
+{
+	serial_putcmd(VT100_SBOLD);
+}
+
+void serial_end_bold(void)
+{
+	serial_putcmd(VT100_EBOLD);
+}
+
+void serial_start_reverse(void)
+{
+	serial_putcmd(VT100_SREVERSE);
+}
+
+void serial_end_reverse(void)
+{
+	serial_putcmd(VT100_EREVERSE);
+}
+
+void serial_start_altcharset(void)
+{
+	serial_putcmd(VT100_SMACS);
+}
+
+void serial_end_altcharset(void)
+{
+	serial_putcmd(VT100_RMACS);
+}
+
+/**
+ * Set the foreground and background colors on the serial console.
+ *
+ * @param fg Foreground color number.
+ * @param bg Background color number.
+ */
+void serial_set_color(short fg, short bg)
+{
+	char buffer[32];
+	snprintf(buffer, sizeof(buffer), VT100_SET_COLOR, fg, bg);
+	serial_putcmd(buffer);
+}
+
+void serial_set_cursor(int y, int x)
+{
+	char buffer[32];
+	snprintf(buffer, sizeof(buffer), VT100_CURSOR_ADDR, y + 1, x + 1);
+	serial_putcmd(buffer);
+}
+
+void serial_cursor_enable(int state)
+{
+	if (state)
+		serial_putcmd(VT100_CURSOR_ON);
+	else
+		serial_putcmd(VT100_CURSOR_OFF);
+}
diff --git a/payloads/libpayload/drivers/serial/s5p.c b/payloads/libpayload/drivers/serial/s5p.c
new file mode 100644
index 0000000000..1d23352ec4
--- /dev/null
+++ b/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);
+	}
+}
diff --git a/payloads/libpayload/drivers/serial/tegra.c b/payloads/libpayload/drivers/serial/tegra.c
new file mode 100644
index 0000000000..bcf7b1925d
--- /dev/null
+++ b/payloads/libpayload/drivers/serial/tegra.c
@@ -0,0 +1,111 @@
+/*
+ * 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 tegra_uart {
+	union {
+		uint32_t thr; // Transmit holding register.
+		uint32_t rbr; // Receive buffer register.
+		uint32_t dll; // Divisor latch lsb.
+	};
+	union {
+		uint32_t ier; // Interrupt enable register.
+		uint32_t dlm; // Divisor latch msb.
+	};
+	union {
+		uint32_t iir; // Interrupt identification register.
+		uint32_t fcr; // FIFO control register.
+	};
+	uint32_t lcr; // Line control register.
+	uint32_t mcr; // Modem control register.
+	uint32_t lsr; // Line status register.
+	uint32_t msr; // Modem status register.
+} __attribute__ ((packed));
+
+enum {
+	TEGRA_UART_LSR_DR = 0x1 << 0, // Data ready.
+	TEGRA_UART_LSR_OE = 0x1 << 1, // Overrun.
+	TEGRA_UART_LSR_PE = 0x1 << 2, // Parity error.
+	TEGRA_UART_LSR_FE = 0x1 << 3, // Framing error.
+	TEGRA_UART_LSR_BI = 0x1 << 4, // Break.
+	TEGRA_UART_LSR_THRE = 0x1 << 5, // Xmit holding register empty.
+	TEGRA_UART_LSR_TEMT = 0x1 << 6, // Xmitter empty.
+	TEGRA_UART_LSR_ERR = 0x1 << 7 // Error.
+};
+
+static struct tegra_uart *uart_regs;
+
+void serial_putchar(unsigned int c)
+{
+	while (!(readb(&uart_regs->lsr) & TEGRA_UART_LSR_THRE));
+	writeb(c, &uart_regs->thr);
+}
+
+int serial_havechar(void)
+{
+	uint8_t lsr = readb(&uart_regs->lsr);
+	return (lsr & TEGRA_UART_LSR_DR) == TEGRA_UART_LSR_DR;
+}
+
+int serial_getchar(void)
+{
+	while (!serial_havechar())
+	{;}
+
+	return readb(&uart_regs->rbr);
+}
+
+static struct console_output_driver tegra_serial_output =
+{
+	.putchar = &serial_putchar
+};
+
+static struct console_input_driver tegra_serial_input =
+{
+	.havekey = &serial_havechar,
+	.getchar = &serial_getchar
+};
+
+void serial_init(void)
+{
+	if (!lib_sysinfo.serial || !lib_sysinfo.serial->baseaddr)
+		return;
+
+	uart_regs = (struct tegra_uart *)lib_sysinfo.serial->baseaddr;
+}
+
+void serial_console_init(void)
+{
+	serial_init();
+
+	if (uart_regs) {
+		console_add_output_driver(&tegra_serial_output);
+		console_add_input_driver(&tegra_serial_input);
+	}
+}