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-rw-r--r--cpu/at91rm9200/Makefile2
-rw-r--r--cpu/at91rm9200/cpu.c7
-rw-r--r--cpu/at91rm9200/i2c.c192
-rw-r--r--cpu/at91rm9200/serial.c25
4 files changed, 219 insertions, 7 deletions
diff --git a/cpu/at91rm9200/Makefile b/cpu/at91rm9200/Makefile
index dfe50c0..b7a30c9 100644
--- a/cpu/at91rm9200/Makefile
+++ b/cpu/at91rm9200/Makefile
@@ -27,7 +27,7 @@ LIB = lib$(CPU).a
START = start.o
OBJS = serial.o interrupts.o cpu.o \
- at91rm9200_ether.o
+ at91rm9200_ether.o i2c.o
all: .depend $(START) $(LIB)
diff --git a/cpu/at91rm9200/cpu.c b/cpu/at91rm9200/cpu.c
index c006d9c..a7e2ca9 100644
--- a/cpu/at91rm9200/cpu.c
+++ b/cpu/at91rm9200/cpu.c
@@ -35,8 +35,8 @@
#include <asm/io.h>
#include <asm/arch/hardware.h>
-#if !defined(CONFIG_DBGU) && !defined(CONFIG_USART1)
-#error must define one of CONFIG_DBGU or CONFIG_USART1
+#if !defined(CONFIG_DBGU) && !defined(CONFIG_USART0) && !defined(CONFIG_USART1)
+#error must define one of CONFIG_DBGU or CONFIG_USART0 or CONFIG_USART1
#endif
/* read co-processor 15, register #1 (control register) */
@@ -123,6 +123,9 @@ int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
#ifdef CONFIG_DBGU
AT91PS_USART us = AT91C_BASE_DBGU;
#endif
+#ifdef CONFIG_USART0
+ AT91PS_USART us = AT91C_BASE_US0;
+#endif
#ifdef CONFIG_USART1
AT91PS_USART us = AT91C_BASE_US1;
#endif
diff --git a/cpu/at91rm9200/i2c.c b/cpu/at91rm9200/i2c.c
new file mode 100644
index 0000000..d5d6268d
--- /dev/null
+++ b/cpu/at91rm9200/i2c.c
@@ -0,0 +1,192 @@
+/*
+ * i2c Support for Atmel's AT91RM9200 Two-Wire Interface
+ *
+ * (c) Rick Bronson
+ *
+ * Borrowed heavily from original work by:
+ * Copyright (c) 2000 Philip Edelbrock <phil@stimpy.netroedge.com>
+ *
+ * Modified to work with u-boot by (C) 2004 Gary Jennejohn garyj@denx.de
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+*/
+#include <common.h>
+
+#ifdef CONFIG_HARD_I2C
+
+#include <i2c.h>
+#include <asm/io.h>
+#include <asm/arch/hardware.h>
+
+#include <at91rm9200_i2c.h>
+
+static int debug = 0;
+
+/*
+ * Poll the i2c status register until the specified bit is set.
+ * Returns 0 if timed out (100 msec)
+ */
+static short at91_poll_status(AT91PS_TWI twi, unsigned long bit) {
+ int loop_cntr = 10000;
+ do {
+ udelay(100);
+ } while (!(twi->TWI_SR & bit) && (--loop_cntr > 0));
+
+ return (loop_cntr > 0);
+}
+
+/*
+ * Generic i2c master transfer entrypoint
+ *
+ * rw == 1 means that this is a read
+ */
+static int
+at91_xfer(unsigned char chip, unsigned int addr, int alen,
+ unsigned char *buffer, int len, int rw)
+{
+ AT91PS_TWI twi = (AT91PS_TWI) AT91_TWI_BASE;
+ int length;
+ unsigned char *buf;
+
+ /* Set the TWI Master Mode Register */
+ twi->TWI_MMR = (chip << 16) | (alen << 8)
+ | ((rw == 1) ? AT91C_TWI_MREAD : 0);
+
+ /* Set TWI Internal Address Register with first messages data field */
+ /* only one address byte is supported */
+ if (alen > 0)
+ twi->TWI_IADR = addr & 0xff;
+
+ length = len;
+ buf = buffer;
+ if (length && buf) { /* sanity check */
+ if (rw) {
+ twi->TWI_CR = AT91C_TWI_START;
+ while (length--) {
+ if (!length)
+ twi->TWI_CR = AT91C_TWI_STOP;
+ /* Wait until transfer is finished */
+ if (!at91_poll_status(twi, AT91C_TWI_RXRDY)) {
+ if (debug)
+ printf("at91_i2c: timeout 1\n");
+ return 1;
+ }
+ *buf++ = twi->TWI_RHR;
+ }
+ if (!at91_poll_status(twi, AT91C_TWI_TXCOMP)) {
+ if (debug)
+ printf("at91_i2c: timeout 2\n");
+ return 1;
+ }
+ } else {
+ twi->TWI_CR = AT91C_TWI_START;
+ while (length--) {
+ twi->TWI_THR = *buf++;
+ if (!length)
+ twi->TWI_CR = AT91C_TWI_STOP;
+ if (!at91_poll_status(twi, AT91C_TWI_TXRDY)) {
+ if (debug)
+ printf("at91_i2c: timeout 3\n");
+ return 1;
+ }
+ }
+ /* Wait until transfer is finished */
+ if (!at91_poll_status(twi, AT91C_TWI_TXCOMP)) {
+ if (debug)
+ printf("at91_i2c: timeout 4\n");
+ return 1;
+ }
+ }
+ }
+ return 0;
+}
+
+int
+i2c_probe(unsigned char chip)
+{
+ char buffer[1];
+
+ return at91_xfer(chip, 0, 0, buffer, 1, 1);
+}
+
+int
+i2c_read(unsigned char chip, unsigned int addr, int alen,
+ unsigned char *buffer, int len)
+{
+ /* we only allow one address byte */
+ if (alen > 1)
+ return 1;
+#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW
+ /* XXX assume an ATMEL AT24C16 */
+ if (alen == 1) {
+ chip |= (addr >> 8) & 0xff;
+ addr = addr & 0xff;
+ }
+#endif
+ return at91_xfer(chip, addr, alen, buffer, len, 1);
+}
+
+int
+i2c_write(unsigned char chip, unsigned int addr, int alen,
+ unsigned char *buffer, int len)
+{
+ int i;
+ unsigned char *buf;
+
+ /* we only allow one address byte */
+ if (alen > 1)
+ return 1;
+#ifdef CFG_I2C_EEPROM_ADDR_OVERFLOW
+ /* XXX assume an ATMEL AT24C16 */
+ if (alen == 1) {
+ buf = buffer;
+ /* do single byte writes */
+ for (i = 0; i < len; i++) {
+ chip |= (addr >> 8) & 0xff;
+ addr = addr & 0xff;
+ if (at91_xfer(chip, addr, alen, buf++, 1, 0))
+ return 1;
+ }
+ }
+ return 0;
+#endif
+ return at91_xfer(chip, addr, alen, buffer, len, 0);
+}
+
+/*
+ * Main initialization routine
+ */
+void
+i2c_init(int speed, int slaveaddr)
+{
+ AT91PS_TWI twi = (AT91PS_TWI) AT91_TWI_BASE;
+
+ *AT91C_PIOA_PDR = AT91C_PA25_TWD | AT91C_PA26_TWCK;
+ *AT91C_PIOA_ASR = AT91C_PA25_TWD | AT91C_PA26_TWCK;
+ *AT91C_PIOA_MDER = AT91C_PA25_TWD | AT91C_PA26_TWCK;
+ *AT91C_PMC_PCER = 1 << AT91C_ID_TWI; /* enable peripheral clock */
+
+ twi->TWI_IDR = 0x3ff; /* Disable all interrupts */
+ twi->TWI_CR = AT91C_TWI_SWRST; /* Reset peripheral */
+ twi->TWI_CR = AT91C_TWI_MSEN | AT91C_TWI_SVDIS; /* Set Master mode */
+
+ /* Here, CKDIV = 1 and CHDIV=CLDIV ==> CLDIV = CHDIV = 1/4*((Fmclk/FTWI) -6) */
+ twi->TWI_CWGR = AT91C_TWI_CKDIV1 | AT91C_TWI_CLDIV3 | (AT91C_TWI_CLDIV3 << 8);
+
+ printf("Found AT91 i2c\n");
+ return;
+}
+#endif /* CONFIG_HARD_I2C */
diff --git a/cpu/at91rm9200/serial.c b/cpu/at91rm9200/serial.c
index c16c9d4..fb03851 100644
--- a/cpu/at91rm9200/serial.c
+++ b/cpu/at91rm9200/serial.c
@@ -33,14 +33,17 @@
#include <asm/io.h>
#include <asm/arch/hardware.h>
-#if !defined(CONFIG_DBGU) && !defined(CONFIG_USART1)
-#error must define one of CONFIG_DBGU or CONFIG_USART1
+#if !defined(CONFIG_DBGU) && !defined(CONFIG_USART0) && !defined(CONFIG_USART1)
+#error must define one of CONFIG_DBGU or CONFIG_USART0 or CONFIG_USART1
#endif
/* ggi thunder */
#ifdef CONFIG_DBGU
AT91PS_USART us = (AT91PS_USART) AT91C_BASE_DBGU;
#endif
+#ifdef CONFIG_USART0
+AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US0;
+#endif
#ifdef CONFIG_USART1
AT91PS_USART us = (AT91PS_USART) AT91C_BASE_US1;
#endif
@@ -50,9 +53,19 @@ void serial_setbrg (void)
DECLARE_GLOBAL_DATA_PTR;
int baudrate;
- if ((baudrate = gd->bd->bi_baudrate) <= 0)
+ if ((baudrate = gd->baudrate) <= 0)
baudrate = CONFIG_BAUDRATE;
- us->US_BRGR = CFG_AT91C_BRGR_DIVISOR; /* hardcode so no __divsi3 */
+ if (baudrate == CONFIG_BAUDRATE) {
+ us->US_BRGR = CFG_AT91C_BRGR_DIVISOR; /* hardcode so no __divsi3 */
+ } else {
+#if 0
+ /* 33 -> 115200 */
+ us->US_BRGR = 33 * (115200/baudrate);
+#else
+ /* MASTER_CLOCK/(16 * baudrate) */
+ us->US_BRGR = (AT91C_MASTER_CLOCK >> 4)/baudrate;
+#endif
+ }
}
int serial_init (void)
@@ -62,6 +75,10 @@ int serial_init (void)
*AT91C_PIOA_PDR = AT91C_PA31_DTXD | AT91C_PA30_DRXD; /* PA 31 & 30 */
*AT91C_PMC_PCER = 1 << AT91C_ID_SYS; /* enable clock */
#endif
+#ifdef CONFIG_USART0
+ *AT91C_PIOA_PDR = AT91C_PA17_TXD0 | AT91C_PA18_RXD0;
+ *AT91C_PMC_PCER |= 1 << AT91C_ID_USART0; /* enable clock */
+#endif
#ifdef CONFIG_USART1
*AT91C_PIOB_PDR = AT91C_PB21_TXD1 | AT91C_PB20_RXD1;
*AT91C_PMC_PCER |= 1 << AT91C_ID_USART1; /* enable clock */
generated by cgit v1.1 at 2024-12-01 03:19:36 +0000