+++ /dev/null
-/*
- * U-boot - serial.c Blackfin Serial Driver
- *
- * Copyright (c) 2005-2008 Analog Devices Inc.
- *
- * Copyright (c) 2003 Bas Vermeulen <bas@buyways.nl>,
- * BuyWays B.V. (www.buyways.nl)
- *
- * Based heavily on:
- * blkfinserial.c: Serial driver for BlackFin DSP internal USRTs.
- * Copyright(c) 2003 Metrowerks <mwaddel@metrowerks.com>
- * Copyright(c) 2001 Tony Z. Kou <tonyko@arcturusnetworks.com>
- * Copyright(c) 2001-2002 Arcturus Networks Inc. <www.arcturusnetworks.com>
- *
- * Based on code from 68328 version serial driver imlpementation which was:
- * Copyright (C) 1995 David S. Miller <davem@caip.rutgers.edu>
- * Copyright (C) 1998 Kenneth Albanowski <kjahds@kjahds.com>
- * Copyright (C) 1998, 1999 D. Jeff Dionne <jeff@uclinux.org>
- * Copyright (C) 1999 Vladimir Gurevich <vgurevic@cisco.com>
- *
- * (C) Copyright 2000-2004
- * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
- *
- * Licensed under the GPL-2 or later.
- */
-
-/* Anomaly notes:
- * 05000086 - we don't support autobaud
- * 05000099 - we only use DR bit, so losing others is not a problem
- * 05000100 - we don't use the UART_IIR register
- * 05000215 - we poll the uart (no dma/interrupts)
- * 05000225 - no workaround possible, but this shouldnt cause errors ...
- * 05000230 - we tweak the baud rate calculation slightly
- * 05000231 - we always use 1 stop bit
- * 05000309 - we always enable the uart before we modify it in anyway
- * 05000350 - we always enable the uart regardless of boot mode
- * 05000363 - we don't support break signals, so don't generate one
- */
-
-#include <common.h>
-#include <watchdog.h>
-#include <asm/blackfin.h>
-#include <asm/mach-common/bits/uart.h>
-
-#ifdef CONFIG_UART_CONSOLE
-
-#include "serial.h"
-
-#ifdef CONFIG_DEBUG_SERIAL
-uint16_t cached_lsr[256];
-uint16_t cached_rbr[256];
-size_t cache_count;
-
-/* The LSR is read-to-clear on some parts, so we have to make sure status
- * bits aren't inadvertently lost when doing various tests. This also
- * works around anomaly 05000099 at the same time by keeping a cumulative
- * tally of all the status bits.
- */
-static uint16_t uart_lsr_save;
-static uint16_t uart_lsr_read(void)
-{
- uint16_t lsr = bfin_read16(&pUART->lsr);
- uart_lsr_save |= (lsr & (OE|PE|FE|BI));
- return lsr | uart_lsr_save;
-}
-/* Just do the clear for everyone since it can't hurt. */
-static void uart_lsr_clear(void)
-{
- uart_lsr_save = 0;
- bfin_write16(&pUART->lsr, bfin_read16(&pUART->lsr) | -1);
-}
-#else
-/* When debugging is disabled, we only care about the DR bit, so if other
- * bits get set/cleared, we don't really care since we don't read them
- * anyways (and thus anomaly 05000099 is irrelevant).
- */
-static uint16_t uart_lsr_read(void)
-{
- return bfin_read16(&pUART->lsr);
-}
-static void uart_lsr_clear(void)
-{
- bfin_write16(&pUART->lsr, bfin_read16(&pUART->lsr) | -1);
-}
-#endif
-
-/* Symbol for our assembly to call. */
-void serial_set_baud(uint32_t baud)
-{
- serial_early_set_baud(baud);
-}
-
-/* Symbol for common u-boot code to call.
- * Setup the baudrate (brg: baudrate generator).
- */
-void serial_setbrg(void)
-{
- DECLARE_GLOBAL_DATA_PTR;
- serial_set_baud(gd->baudrate);
-}
-
-/* Symbol for our assembly to call. */
-void serial_initialize(void)
-{
- serial_early_init();
-}
-
-/* Symbol for common u-boot code to call. */
-int serial_init(void)
-{
- serial_initialize();
- serial_setbrg();
- uart_lsr_clear();
-#ifdef CONFIG_DEBUG_SERIAL
- cache_count = 0;
- memset(cached_lsr, 0x00, sizeof(cached_lsr));
- memset(cached_rbr, 0x00, sizeof(cached_rbr));
-#endif
- return 0;
-}
-
-void serial_putc(const char c)
-{
- /* send a \r for compatibility */
- if (c == '\n')
- serial_putc('\r');
-
- WATCHDOG_RESET();
-
- /* wait for the hardware fifo to clear up */
- while (!(uart_lsr_read() & THRE))
- continue;
-
- /* queue the character for transmission */
- bfin_write16(&pUART->thr, c);
- SSYNC();
-
- WATCHDOG_RESET();
-}
-
-int serial_tstc(void)
-{
- WATCHDOG_RESET();
- return (uart_lsr_read() & DR) ? 1 : 0;
-}
-
-int serial_getc(void)
-{
- uint16_t uart_rbr_val;
-
- /* wait for data ! */
- while (!serial_tstc())
- continue;
-
- /* grab the new byte */
- uart_rbr_val = bfin_read16(&pUART->rbr);
-
-#ifdef CONFIG_DEBUG_SERIAL
- /* grab & clear the LSR */
- uint16_t uart_lsr_val = uart_lsr_read();
-
- cached_lsr[cache_count] = uart_lsr_val;
- cached_rbr[cache_count] = uart_rbr_val;
- cache_count = (cache_count + 1) % ARRAY_SIZE(cached_lsr);
-
- if (uart_lsr_val & (OE|PE|FE|BI)) {
- uint16_t dll, dlh;
- printf("\n[SERIAL ERROR]\n");
- ACCESS_LATCH();
- dll = bfin_read16(&pUART->dll);
- dlh = bfin_read16(&pUART->dlh);
- ACCESS_PORT_IER();
- printf("\tDLL=0x%x DLH=0x%x\n", dll, dlh);
- do {
- --cache_count;
- printf("\t%3i: RBR=0x%02x LSR=0x%02x\n", cache_count,
- cached_rbr[cache_count], cached_lsr[cache_count]);
- } while (cache_count > 0);
- return -1;
- }
-#endif
- uart_lsr_clear();
-
- return uart_rbr_val;
-}
-
-void serial_puts(const char *s)
-{
- while (*s)
- serial_putc(*s++);
-}
-
-#endif
projects / u-boot / blobdiff