Alexandru Gagniuc (mr.nuke.me@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/12524
-gerrit
commit ff7c3f12bf9991be6308b1a96c97c886bffea451 Author: Alexandru Gagniuc mr.nuke.me@gmail.com Date: Mon Nov 23 16:18:12 2015 -0800
libpayload: Remove redundant 8250 MMIO32 UART driver
The more generic 8250 driver can handle both port-mapped and memory- mapped 8250-compatible UARTs, with different register sizes. Thus, a separate driver for MMIO32 is not needed. The generic 8250 driver was tested to work for both output and input, on Apollolake SoC, which only presents an MMIO32 UART.
Change-Id: Idab766588ddd097649a37de92394b0078ecc660a Signed-off-by: Alexandru Gagniuc mr.nuke.me@gmail.com --- payloads/libpayload/Kconfig | 10 +- payloads/libpayload/drivers/serial/8250_mmio32.c | 113 ----------------------- 2 files changed, 2 insertions(+), 121 deletions(-)
diff --git a/payloads/libpayload/Kconfig b/payloads/libpayload/Kconfig index 024fa15..5e02624 100644 --- a/payloads/libpayload/Kconfig +++ b/payloads/libpayload/Kconfig @@ -200,21 +200,15 @@ config SERIAL_CONSOLE default y
config 8250_SERIAL_CONSOLE - bool "8250, 16450, 16550, 16550A compatible serial port driver" + bool "8250-compatible serial port driver (including IO and MMIO)" depends on SERIAL_CONSOLE - default y if ARCH_X86 - default n if !ARCH_X86 + default y
config S5P_SERIAL_CONSOLE bool "Exynos SOC, S5P compatible serial port driver" depends on SERIAL_CONSOLE default n
-config 8250_MMIO32_SERIAL_CONSOLE - bool "Memory-mapped 8250-compatible serial port driver with 32-bit regs" - depends on SERIAL_CONSOLE - default n - config IPQ806X_SERIAL_CONSOLE bool "IPQ806x SOC compatible serial port driver" depends on SERIAL_CONSOLE diff --git a/payloads/libpayload/drivers/serial/8250_mmio32.c b/payloads/libpayload/drivers/serial/8250_mmio32.c deleted file mode 100644 index 285f7f6..0000000 --- a/payloads/libpayload/drivers/serial/8250_mmio32.c +++ /dev/null @@ -1,113 +0,0 @@ -/* - * 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 mmio32_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 { - LSR_DR = 0x1 << 0, // Data ready. - LSR_OE = 0x1 << 1, // Overrun. - LSR_PE = 0x1 << 2, // Parity error. - LSR_FE = 0x1 << 3, // Framing error. - LSR_BI = 0x1 << 4, // Break. - LSR_THRE = 0x1 << 5, // Xmit holding register empty. - LSR_TEMT = 0x1 << 6, // Xmitter empty. - LSR_ERR = 0x1 << 7 // Error. -}; - -static struct mmio32_uart *uart = NULL; - -void serial_putchar(unsigned int c) -{ - while (!(readl(&uart->lsr) & LSR_THRE)) - /* wait for transmit register to clear */; - - writel((char)c, &uart->thr); - if (c == '\n') - serial_putchar('\r'); -} - -int serial_havechar(void) -{ - uint8_t lsr = readl(&uart->lsr); - return (lsr & LSR_DR) == LSR_DR; -} - -int serial_getchar(void) -{ - while (!serial_havechar()) - /* wait for character */; - - return readl(&uart->rbr); -} - -static struct console_output_driver mmio32_serial_output = { - .putchar = &serial_putchar -}; - -static struct console_input_driver mmio32_serial_input = { - .havekey = &serial_havechar, - .getchar = &serial_getchar -}; - -void serial_init(void) -{ - if (!lib_sysinfo.serial || !lib_sysinfo.serial->baseaddr) - return; - - uart = (struct mmio32_uart *)(uintptr_t)lib_sysinfo.serial->baseaddr; -} - -void serial_console_init(void) -{ - serial_init(); - - if (uart) { - console_add_output_driver(&mmio32_serial_output); - console_add_input_driver(&mmio32_serial_input); - } -}