diff options
Diffstat (limited to 'payloads/libpayload/drivers/serial.c')
| -rw-r--r-- | payloads/libpayload/drivers/serial.c | 155 |
1 files changed, 49 insertions, 106 deletions
diff --git a/payloads/libpayload/drivers/serial.c b/payloads/libpayload/drivers/serial.c index cd00a13204..0d26750941 100644 --- a/payloads/libpayload/drivers/serial.c +++ b/payloads/libpayload/drivers/serial.c @@ -32,68 +32,61 @@ #include <libpayload.h> #define IOBASE lib_sysinfo.serial->baseaddr -#define MEMBASE (phys_to_virt(lib_sysinfo.serial->baseaddr)) -#define DIVISOR(x) (115200 / x) +#define MEMBASE (phys_to_virt(IOBASE)) -static int serial_io_hardware_is_present = 1; +static int serial_hardware_is_present = 0; +static int serial_is_mem_mapped = 0; -#ifdef CONFIG_SERIAL_SET_SPEED -static void serial_io_hardware_init(int port, int speed, int word_bits, int parity, int stop_bits) +static uint8_t serial_read_reg(int offset) { - unsigned char reg; - - /* Disable interrupts. */ - outb(0, port + 0x01); - - /* Assert RTS and DTR. */ - outb(3, port + 0x04); - - /* Set the divisor latch. */ - reg = inb(port + 0x03); - outb(reg | 0x80, port + 0x03); - - /* Write the divisor. */ - outb(DIVISOR(speed) & 0xFF, port); - outb(DIVISOR(speed) >> 8 & 0xFF, port + 1); + if (serial_is_mem_mapped) + return readb(MEMBASE + offset); + else + return inb(IOBASE + offset); +} - /* Restore the previous value of the divisor. - * And set 8 bits per character */ - outb((reg & ~0x80) | 3, port + 0x03); +static void serial_write_reg(uint8_t val, int offset) +{ + if (serial_is_mem_mapped) + writeb(val, MEMBASE + offset); + else + outb(val, IOBASE + offset); } -static void serial_mem_hardware_init(int port, int speed, int word_bits, int parity, int stop_bits) +#ifdef CONFIG_SERIAL_SET_SPEED +static void serial_hardware_init(int speed, int word_bits, + int parity, int stop_bits) { unsigned char reg; - /* We will assume 8n1 for now. Does anyone use anything else these days? */ - /* Disable interrupts. */ - writeb(0, MEMBASE + 0x01); + serial_write_reg(0, 0x01); /* Assert RTS and DTR. */ - writeb(3, MEMBASE + 0x04); + serial_write_reg(3, 0x04); /* Set the divisor latch. */ - reg = readb(MEMBASE + 0x03); - writeb(reg | 0x80, MEMBASE + 0x03); + reg = serial_read_reg(0x03); + serial_write_reg(reg | 0x80, 0x03); /* Write the divisor. */ - writeb(DIVISOR(speed) & 0xFF, MEMBASE); - writeb(DIVISOR(speed) >> 8 & 0xFF, MEMBASE + 1); + 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 */ - writeb((reg & ~0x80) | 3, MEMBASE + 0x03); + serial_write_reg((reg & ~0x80) | 3, 0x03); } #endif static struct console_input_driver consin = { - .havekey = serial_havechar, - .getchar = serial_getchar + .havekey = &serial_havechar, + .getchar = &serial_getchar }; static struct console_output_driver consout = { - .putchar = serial_putchar + .putchar = &serial_putchar }; void serial_init(void) @@ -101,94 +94,44 @@ void serial_init(void) if (!lib_sysinfo.serial) return; -#ifdef CONFIG_SERIAL_SET_SPEED - if (lib_sysinfo.serial->type == CB_SERIAL_TYPE_MEMORY_MAPPED) - serial_mem_hardware_init(IOBASE, CONFIG_SERIAL_BAUD_RATE, 8, 0, 1); - else - serial_io_hardware_init(IOBASE, CONFIG_SERIAL_BAUD_RATE, 8, 0, 1); -#endif - console_add_input_driver(&consin); - console_add_output_driver(&consout); + serial_is_mem_mapped = + (lib_sysinfo.serial->type == CB_SERIAL_TYPE_MEMORY_MAPPED); - /* check to see if there's actually serial port h/w */ - if (lib_sysinfo.ser_ioport) { - if( (inb(IOBASE + 0x05)==0xFF) && (inb(IOBASE + 0x06)==0xFF) ) - serial_io_hardware_is_present = 0; + if (!serial_is_mem_mapped && (inb(IOBASE + 0x05) == 0xFF) && + (inb(IOBASE + 0x06) == 0xFF)) { + return; } -} - -static void serial_io_putchar(unsigned int c) -{ - c &= 0xff; - while ((inb(IOBASE + 0x05) & 0x20) == 0) ; - outb(c, IOBASE); -} -static int serial_io_havechar(void) -{ - if ( !serial_io_hardware_is_present ) - return 0; - return inb(IOBASE + 0x05) & 0x01; -} - -static int serial_io_getchar(void) -{ - if ( !serial_io_hardware_is_present ) - return -1; - while (!serial_io_havechar()) ; - return (int)inb(IOBASE); -} + serial_hardware_is_present = 1; -static void serial_mem_putchar(unsigned int c) -{ - c &= 0xff; - while ((readb(MEMBASE + 0x05) & 0x20) == 0) ; - writeb(c, MEMBASE); -} - -static int serial_mem_havechar(void) -{ - return readb(MEMBASE + 0x05) & 0x01; -} - -static int serial_mem_getchar(void) -{ - while (!serial_mem_havechar()) ; - return (int)readb(MEMBASE); +#ifdef CONFIG_SERIAL_SET_SPEED + serial_hardware_init(CONFIG_SERIAL_BAUD_RATE, 8, 0, 1); +#endif + console_add_input_driver(&consin); + console_add_output_driver(&consout); } - void serial_putchar(unsigned int c) { - if (!lib_sysinfo.serial) + if (!serial_hardware_is_present) return; - - if (lib_sysinfo.serial->type == CB_SERIAL_TYPE_MEMORY_MAPPED) - serial_mem_putchar(c); - else - serial_io_putchar(c); + while ((serial_read_reg(0x05) & 0x20) == 0) ; + serial_write_reg(c, 0x00); } int serial_havechar(void) { - if (!lib_sysinfo.serial) + if (!serial_hardware_is_present) return 0; - - if (lib_sysinfo.ser_base) - return serial_mem_havechar(); - else - return serial_io_havechar(); + return serial_read_reg(0x05) & 0x01; } int serial_getchar(void) { - if (!lib_sysinfo.serial) + if (!serial_hardware_is_present) return -1; - - if (lib_sysinfo.ser_base) - return serial_mem_getchar(); - else - return serial_io_getchar(); + while (!serial_havechar()) ; + return serial_read_reg(0x00); } /* These are thinly veiled vt100 functions used by curses */ @@ -214,7 +157,7 @@ int serial_getchar(void) static void serial_putcmd(const char *str) { - while(*str) + while (*str) serial_putchar(*(str++)); } |