122 lines
2.7 KiB
C
122 lines
2.7 KiB
C
/*
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* serial.c -- KS8695 serial driver
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*
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* (C) Copyright 2004, Greg Ungerer <greg.ungerer@opengear.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <asm/arch/platform.h>
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#include <serial.h>
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#include <linux/compiler.h>
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#ifndef CONFIG_SERIAL1
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#error "Bad: you didn't configure serial ..."
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#endif
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DECLARE_GLOBAL_DATA_PTR;
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/*
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* Define the UART hardware register access structure.
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*/
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struct ks8695uart {
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unsigned int RX; /* 0x00 - Receive data (r) */
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unsigned int TX; /* 0x04 - Transmit data (w) */
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unsigned int FCR; /* 0x08 - Fifo Control (r/w) */
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unsigned int LCR; /* 0x0c - Line Control (r/w) */
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unsigned int MCR; /* 0x10 - Modem Control (r/w) */
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unsigned int LSR; /* 0x14 - Line Status (r/w) */
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unsigned int MSR; /* 0x18 - Modem Status (r/w) */
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unsigned int BD; /* 0x1c - Baud Rate (r/w) */
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unsigned int SR; /* 0x20 - Status (r/w) */
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};
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#define KS8695_UART_ADDR ((void *) (KS8695_IO_BASE + KS8695_UART_RX_BUFFER))
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#define KS8695_UART_CLK 25000000
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/*
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* Under some circumstances we want to be "quiet" and not issue any
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* serial output - though we want u-boot to otherwise work and behave
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* the same. By default be noisy.
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*/
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int serial_console = 1;
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static void ks8695_serial_setbrg(void)
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{
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volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
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/* Set to global baud rate and 8 data bits, no parity, 1 stop bit*/
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uartp->BD = KS8695_UART_CLK / gd->baudrate;
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uartp->LCR = KS8695_UART_LINEC_WLEN8;
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}
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static int ks8695_serial_init(void)
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{
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serial_console = 1;
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serial_setbrg();
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return 0;
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}
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static void ks8695_serial_raw_putc(const char c)
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{
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volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
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int i;
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for (i = 0; (i < 0x100000); i++) {
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if (uartp->LSR & KS8695_UART_LINES_TXFE)
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break;
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}
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uartp->TX = c;
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}
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static void ks8695_serial_putc(const char c)
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{
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if (serial_console) {
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ks8695_serial_raw_putc(c);
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if (c == '\n')
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ks8695_serial_raw_putc('\r');
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}
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}
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static int ks8695_serial_tstc(void)
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{
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volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
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if (serial_console)
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return ((uartp->LSR & KS8695_UART_LINES_RXFE) ? 1 : 0);
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return 0;
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}
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static int ks8695_serial_getc(void)
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{
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volatile struct ks8695uart *uartp = KS8695_UART_ADDR;
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while ((uartp->LSR & KS8695_UART_LINES_RXFE) == 0)
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;
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return (uartp->RX);
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}
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static struct serial_device ks8695_serial_drv = {
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.name = "ks8695_serial",
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.start = ks8695_serial_init,
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.stop = NULL,
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.setbrg = ks8695_serial_setbrg,
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.putc = ks8695_serial_putc,
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.puts = default_serial_puts,
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.getc = ks8695_serial_getc,
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.tstc = ks8695_serial_tstc,
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};
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void ks8695_serial_initialize(void)
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{
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serial_register(&ks8695_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &ks8695_serial_drv;
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}
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