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/*
* (C) Copyright 2007
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* Author: Igor Lisitsin <igor@emcraft.com>
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
/*
* UART test
*
* The controllers are configured to loopback mode and several
* characters are transmitted.
*/
#ifdef CONFIG_POST
#include <post.h>
#if CONFIG_POST & CFG_POST_UART
#include <asm/processor.h>
#include <serial.h>
#define UART0_BASE CFG_PERIPHERAL_BASE + 0x00000300
#define UART1_BASE CFG_PERIPHERAL_BASE + 0x00000400
#define UART2_BASE CFG_PERIPHERAL_BASE + 0x00000500
#define UART3_BASE CFG_PERIPHERAL_BASE + 0x00000600
#define CR0_MASK 0xdfffffff
#define CR0_EXTCLK_ENA 0x00800000
#define CR0_UDIV_POS 0
#define UDIV_SUBTRACT 0
#define UART0_SDR sdr_uart0
#define UART1_SDR sdr_uart1
#define UART2_SDR sdr_uart2
#define UART3_SDR sdr_uart3
#define MFREG(a, d) mfsdr(a, d)
#define MTREG(a, d) mtsdr(a, d)
#define UART_RBR 0x00
#define UART_THR 0x00
#define UART_IER 0x01
#define UART_IIR 0x02
#define UART_FCR 0x02
#define UART_LCR 0x03
#define UART_MCR 0x04
#define UART_LSR 0x05
#define UART_MSR 0x06
#define UART_SCR 0x07
#define UART_DLL 0x00
#define UART_DLM 0x01
/*
Line Status Register.
*/
#define asyncLSRDataReady1 0x01
#define asyncLSROverrunError1 0x02
#define asyncLSRParityError1 0x04
#define asyncLSRFramingError1 0x08
#define asyncLSRBreakInterrupt1 0x10
#define asyncLSRTxHoldEmpty1 0x20
#define asyncLSRTxShiftEmpty1 0x40
#define asyncLSRRxFifoError1 0x80
DECLARE_GLOBAL_DATA_PTR;
#if !defined(CFG_EXT_SERIAL_CLOCK)
static void serial_divs (int baudrate, unsigned long *pudiv,
unsigned short *pbdiv)
{
sys_info_t sysinfo;
unsigned long div; /* total divisor udiv * bdiv */
unsigned long umin; /* minimum udiv */
unsigned short diff; /* smallest diff */
unsigned long udiv; /* best udiv */
unsigned short idiff; /* current diff */
unsigned short ibdiv; /* current bdiv */
unsigned long i;
unsigned long est; /* current estimate */
get_sys_info(&sysinfo);
udiv = 32; /* Assume lowest possible serial clk */
div = sysinfo.freqPLB / (16 * baudrate); /* total divisor */
umin = sysinfo.pllOpbDiv << 1; /* 2 x OPB divisor */
diff = 32; /* highest possible */
/* i is the test udiv value -- start with the largest
* possible (32) to minimize serial clock and constrain
* search to umin.
*/
for (i = 32; i > umin; i--) {
ibdiv = div / i;
est = i * ibdiv;
idiff = (est > div) ? (est-div) : (div-est);
if (idiff == 0) {
udiv = i;
break; /* can't do better */
} else if (idiff < diff) {
udiv = i; /* best so far */
diff = idiff; /* update lowest diff*/
}
}
*pudiv = udiv;
*pbdiv = div / udiv;
}
#endif
static int uart_post_init (unsigned long dev_base)
{
unsigned long reg;
unsigned long udiv;
unsigned short bdiv;
volatile char val;
#ifdef CFG_EXT_SERIAL_CLOCK
unsigned long tmp;
#endif
int i;
for (i = 0; i < 3500; i++) {
if (in8 (dev_base + UART_LSR) & asyncLSRTxHoldEmpty1)
break;
udelay (100);
}
MFREG(UART0_SDR, reg);
reg &= ~CR0_MASK;
#ifdef CFG_EXT_SERIAL_CLOCK
reg |= CR0_EXTCLK_ENA;
udiv = 1;
tmp = gd->baudrate * 16;
bdiv = (CFG_EXT_SERIAL_CLOCK + tmp / 2) / tmp;
#else
/* For 440, the cpu clock is on divider chain A, UART on divider
* chain B ... so cpu clock is irrelevant. Get the "optimized"
* values that are subject to the 1/2 opb clock constraint
*/
serial_divs (gd->baudrate, &udiv, &bdiv);
#endif
reg |= (udiv - UDIV_SUBTRACT) << CR0_UDIV_POS; /* set the UART divisor */
/*
* Configure input clock to baudrate generator for all
* available serial ports here
*/
MTREG(UART0_SDR, reg);
#if defined(UART1_SDR)
MTREG(UART1_SDR, reg);
#endif
#if defined(UART2_SDR)
MTREG(UART2_SDR, reg);
#endif
#if defined(UART3_SDR)
MTREG(UART3_SDR, reg);
#endif
out8(dev_base + UART_LCR, 0x80); /* set DLAB bit */
out8(dev_base + UART_DLL, bdiv); /* set baudrate divisor */
out8(dev_base + UART_DLM, bdiv >> 8); /* set baudrate divisor */
out8(dev_base + UART_LCR, 0x03); /* clear DLAB; set 8 bits, no parity */
out8(dev_base + UART_FCR, 0x00); /* disable FIFO */
out8(dev_base + UART_MCR, 0x10); /* enable loopback mode */
val = in8(dev_base + UART_LSR); /* clear line status */
val = in8(dev_base + UART_RBR); /* read receive buffer */
out8(dev_base + UART_SCR, 0x00); /* set scratchpad */
out8(dev_base + UART_IER, 0x00); /* set interrupt enable reg */
return 0;
}
static void uart_post_putc (unsigned long dev_base, char c)
{
int i;
out8 (dev_base + UART_THR, c); /* put character out */
/* Wait for transfer completion */
for (i = 0; i < 3500; i++) {
if (in8 (dev_base + UART_LSR) & asyncLSRTxHoldEmpty1)
break;
udelay (100);
}
}
static int uart_post_getc (unsigned long dev_base)
{
int i;
/* Wait for character available */
for (i = 0; i < 3500; i++) {
if (in8 (dev_base + UART_LSR) & asyncLSRDataReady1)
break;
udelay (100);
}
return 0xff & in8 (dev_base + UART_RBR);
}
static int test_ctlr (unsigned long dev_base, int index)
{
int res = -1;
char test_str[] = "*** UART Test String ***\r\n";
int i;
uart_post_init (dev_base);
for (i = 0; i < sizeof (test_str) - 1; i++) {
uart_post_putc (dev_base, test_str[i]);
if (uart_post_getc (dev_base) != test_str[i])
goto done;
}
res = 0;
done:
if (res)
post_log ("uart%d test failed\n", index);
return res;
}
int uart_post_test (int flags)
{
int i, res = 0;
static unsigned long base[] = {
UART0_BASE, UART1_BASE, UART2_BASE, UART3_BASE
};
for (i = 0; i < sizeof (base) / sizeof (base[0]); i++) {
if (test_ctlr (base[i], i))
res = -1;
}
serial_reinit_all ();
return res;
}
#endif /* CONFIG_POST & CFG_POST_UART */
#endif /* CONFIG_POST */
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