coreboot-kgpe-d16/payloads/libpayload/drivers/serial/tegra.c

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/*
* 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);
libpayload: console: Allow output drivers to print whole strings at once The console output driver framework in libpayload is currently built on the putchar primitive, meaning that every driver's function gets called one character at a time. This becomes an issue when we add drivers that could output multiple characters at a time, but have a high constant overhead per invocation (such as the planned GDB stub, which needs to wrap a special frame around output strings and wait for an acknowledgement from the server). This patch adds a new 'write' function pointer to the console_output_driver structure as an alternative to 'putchar'. Output drivers need to provide at least one of the two ('write' is preferred if available). The CBMEM console driver is ported as a proof of concept (since it's our most performace-critical driver and should in theory benefit the most from less function pointer invocations, although it's probably still negligible compared to the big sprawling mess that is printf()). Even with this fix, the problem remains that printf() was written with the putchar primitive in mind. Even though normal text already contains an optimization to allow multiple characters at a time, almost all formatting directives cause their output (including things like padding whitespace) to be putchar()ed one character at a time. Therefore, this patch reworks parts of the output code (especially number printing) to all but remove that inefficiency (directives still invoke an extra write() call, but at least not one per character). Since I'm touching printf() core code anyway, I also tried to salvage what I could from that weird, broken "return negative on error" code path (not that any of our current output drivers can trigger it anyway). A final consequence of this patch is that the responsibility to prepend line feeds with carriage returns is moved into the output driver implementations. Doing this only makes sense for drivers with explicit cursor position control (i.e. serial or video), and things like the CBMEM console that appears like a normal file to the system really have no business containing carriage returns (we don't want people to accidentally associate us with Windows, now, do we?). BUG=chrome-os-partner:18390 TEST=Made sure video and CBMEM console still look good, tried printf() with as many weird edge-case strings as I could find and compared serial output as well as sprintf() return value. Original-Change-Id: Ie05ae489332a0103461620f5348774b6d4afd91a Original-Signed-off-by: Julius Werner <jwerner@chromium.org> Original-Reviewed-on: https://chromium-review.googlesource.com/196384 Original-Reviewed-by: Hung-Te Lin <hungte@chromium.org> Original-Reviewed-by: David Hendricks <dhendrix@chromium.org> (cherry picked from commit ab1ef0c07736fe1aa3e0baaf02d258731e6856c0) Signed-off-by: Marc Jones <marc.jones@se-eng.com> Change-Id: I78f5aedf6d0c3665924995cdab691ee0162de404 Reviewed-on: http://review.coreboot.org/7880 Tested-by: build bot (Jenkins) Reviewed-by: Patrick Georgi <pgeorgi@google.com>
2014-04-18 05:00:20 +02:00
if (c == '\n')
serial_putchar('\r');
}
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);
}
}