New patch to review for coreboot: 30496f1 libpayload: serial: Move the depthcharge serial drivers into libpayload.
Marc Jones (marc.jones@se-eng.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/7224
-gerrit
commit 30496f1afdbf32596cb8a7ebae386a12ba36ab16 Author: Gabe Black gabeblack@google.com Date: Thu Apr 10 01:07:28 2014 -0700
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 --- payloads/libpayload/Config.in | 10 ++ payloads/libpayload/drivers/Makefile.inc | 4 +- payloads/libpayload/drivers/serial.c | 245 ----------------------------- payloads/libpayload/drivers/serial/8250.c | 245 +++++++++++++++++++++++++++++ payloads/libpayload/drivers/serial/s5p.c | 106 +++++++++++++ payloads/libpayload/drivers/serial/tegra.c | 111 +++++++++++++ 6 files changed, 475 insertions(+), 246 deletions(-)
diff --git a/payloads/libpayload/Config.in b/payloads/libpayload/Config.in index 2a5048c..f47d105 100644 --- a/payloads/libpayload/Config.in +++ b/payloads/libpayload/Config.in @@ -168,6 +168,16 @@ config 8250_SERIAL_CONSOLE default y if ARCH_X86 default n if !ARCH_X86
+config S5P_SERIAL_CONSOLE + bool "Exynos SOC, S5P compatible serial port driver" + depends on SERIAL_CONSOLE + default n + +config TEGRA_SERIAL_CONSOLE + bool "Tegra SOC compatible serial port driver" + depends on SERIAL_CONSOLE + default n + config SERIAL_IOBASE ## This default is currently not used on non-x86 systems. hex "Default I/O base for the serial port (default 0x3f8)" diff --git a/payloads/libpayload/drivers/Makefile.inc b/payloads/libpayload/drivers/Makefile.inc index ed8fe41..5ce0a79 100644 --- a/payloads/libpayload/drivers/Makefile.inc +++ b/payloads/libpayload/drivers/Makefile.inc @@ -33,7 +33,9 @@ libc-$(CONFIG_LP_PCI) += pci.c
libc-$(CONFIG_LP_SPEAKER) += speaker.c
-libc-$(CONFIG_LP_8250_SERIAL_CONSOLE) += serial.c +libc-$(CONFIG_LP_8250_SERIAL_CONSOLE) += serial/8250.c +libc-$(CONFIG_LP_S5P_SERIAL_CONSOLE) += serial/s5p.c +libc-$(CONFIG_LP_TEGRA_SERIAL_CONSOLE) += serial/tegra.c
libc-$(CONFIG_LP_PC_KEYBOARD) += keyboard.c
diff --git a/payloads/libpayload/drivers/serial.c b/payloads/libpayload/drivers/serial.c deleted file mode 100644 index a4c1b1a..0000000 --- a/payloads/libpayload/drivers/serial.c +++ /dev/null @@ -1,245 +0,0 @@ -/* - * 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/8250.c b/payloads/libpayload/drivers/serial/8250.c new file mode 100644 index 0000000..a4c1b1a --- /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 0000000..1d23352 --- /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 0000000..bcf7b19 --- /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); + } +}
-
Marc Jones