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84 lines
2.1 KiB
84 lines
2.1 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* 16550 serial console support. |
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* |
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* Original copied from <file:arch/ppc/boot/common/ns16550.c> |
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* (which had no copyright) |
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* Modifications: 2006 (c) MontaVista Software, Inc. |
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* |
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* Modified by: Mark A. Greer <[email protected]> |
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*/ |
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#include <stdarg.h> |
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#include <stddef.h> |
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#include "types.h" |
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#include "string.h" |
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#include "stdio.h" |
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#include "io.h" |
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#include "ops.h" |
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#include "of.h" |
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#define UART_DLL 0 /* Out: Divisor Latch Low */ |
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#define UART_DLM 1 /* Out: Divisor Latch High */ |
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#define UART_FCR 2 /* Out: FIFO Control Register */ |
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#define UART_LCR 3 /* Out: Line Control Register */ |
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#define UART_MCR 4 /* Out: Modem Control Register */ |
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#define UART_LSR 5 /* In: Line Status Register */ |
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#define UART_LSR_THRE 0x20 /* Transmit-hold-register empty */ |
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#define UART_LSR_DR 0x01 /* Receiver data ready */ |
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#define UART_MSR 6 /* In: Modem Status Register */ |
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#define UART_SCR 7 /* I/O: Scratch Register */ |
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static unsigned char *reg_base; |
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static u32 reg_shift; |
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static int ns16550_open(void) |
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{ |
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out_8(reg_base + (UART_FCR << reg_shift), 0x06); |
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return 0; |
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} |
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static void ns16550_putc(unsigned char c) |
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{ |
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while ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_THRE) == 0); |
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out_8(reg_base, c); |
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} |
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static unsigned char ns16550_getc(void) |
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{ |
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while ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_DR) == 0); |
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return in_8(reg_base); |
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} |
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static u8 ns16550_tstc(void) |
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{ |
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return ((in_8(reg_base + (UART_LSR << reg_shift)) & UART_LSR_DR) != 0); |
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} |
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int ns16550_console_init(void *devp, struct serial_console_data *scdp) |
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{ |
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int n; |
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u32 reg_offset; |
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if (dt_get_virtual_reg(devp, (void **)®_base, 1) < 1) { |
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printf("virt reg parse fail...\r\n"); |
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return -1; |
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} |
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n = getprop(devp, "reg-offset", ®_offset, sizeof(reg_offset)); |
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if (n == sizeof(reg_offset)) |
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reg_base += be32_to_cpu(reg_offset); |
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n = getprop(devp, "reg-shift", ®_shift, sizeof(reg_shift)); |
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if (n != sizeof(reg_shift)) |
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reg_shift = 0; |
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else |
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reg_shift = be32_to_cpu(reg_shift); |
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scdp->open = ns16550_open; |
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scdp->putc = ns16550_putc; |
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scdp->getc = ns16550_getc; |
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scdp->tstc = ns16550_tstc; |
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scdp->close = NULL; |
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return 0; |
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}
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