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-rw-r--r--cpu/mpc83xx/i2c.c251
1 files changed, 251 insertions, 0 deletions
diff --git a/cpu/mpc83xx/i2c.c b/cpu/mpc83xx/i2c.c
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+/*
+ * (C) Copyright 2003,Motorola Inc.
+ * Xianghua Xiao <x.xiao@motorola.com>
+ * Adapted for Motorola 85xx chip.
+ *
+ * (C) Copyright 2003
+ * Gleb Natapov <gnatapov@mrv.com>
+ * Some bits are taken from linux driver writen by adrian@humboldt.co.uk
+ *
+ * Hardware I2C driver for MPC107 PCI bridge.
+ *
+ * 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
+ *
+ * Change log:
+ *
+ * 20050101: Eran Liberty (liberty@freescale.com)
+ * Initial file creating (porting from 85XX & 8260)
+ */
+
+#include <common.h>
+#include <command.h>
+#include <asm/io.h>
+
+#ifdef CONFIG_HARD_I2C
+#include <i2c.h>
+#include <asm/i2c.h>
+
+#ifdef CONFIG_MPC8349ADS
+i2c_t * mpc8349_i2c = (i2c_t*)(CFG_IMMRBAR + CFG_I2C_OFFSET);
+#endif
+
+void
+i2c_init(int speed, int slaveadd)
+{
+ /* stop I2C controller */
+ writeb(0x00 , &I2C->cr);
+
+ /* set clock */
+ writeb(0x3f, &I2C->fdr);
+
+ /* set default filter */
+ writeb(0x10,&I2C->dfsrr);
+
+ /* write slave address */
+ writeb(slaveadd, &I2C->adr);
+
+ /* clear status register */
+ writeb(0x00, &I2C->sr);
+
+ /* start I2C controller */
+ writeb(I2C_CR_MEN, &I2C->cr);
+}
+
+static __inline__ int
+i2c_wait4bus (void)
+{
+ ulong timeval = get_timer (0);
+ while (readb(&I2C->sr) & I2C_SR_MBB) {
+ if (get_timer (timeval) > I2C_TIMEOUT) {
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static __inline__ int
+i2c_wait (int write)
+{
+ u32 csr;
+ ulong timeval = get_timer(0);
+ do {
+ csr = readb(&I2C->sr);
+
+ if (!(csr & I2C_SR_MIF))
+ continue;
+
+ writeb(0x0, &I2C->sr);
+
+ if (csr & I2C_SR_MAL) {
+ debug("i2c_wait: MAL\n");
+ return -1;
+ }
+
+ if (!(csr & I2C_SR_MCF)) {
+ debug("i2c_wait: unfinished\n");
+ return -1;
+ }
+
+ if (write == I2C_WRITE && (csr & I2C_SR_RXAK)) {
+ debug("i2c_wait: No RXACK\n");
+ return -1;
+ }
+
+ return 0;
+ } while (get_timer (timeval) < I2C_TIMEOUT);
+ debug("i2c_wait: timed out\n");
+}
+
+static __inline__ int
+i2c_write_addr (u8 dev, u8 dir, int rsta)
+{
+ writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX |
+ (rsta?I2C_CR_RSTA:0),
+ &I2C->cr);
+
+ writeb((dev << 1) | dir, &I2C->dr);
+
+ if (i2c_wait (I2C_WRITE) < 0)
+ return 0;
+ return 1;
+}
+
+static __inline__ int
+__i2c_write (u8 *data, int length)
+{
+ int i;
+
+ writeb(I2C_CR_MEN | I2C_CR_MSTA | I2C_CR_MTX,
+ &I2C->cr);
+
+ for (i=0; i < length; i++) {
+ writeb(data[i], &I2C->dr);
+
+ if (i2c_wait (I2C_WRITE) < 0)
+ break;
+ }
+ return i;
+}
+
+static __inline__ int
+__i2c_read (u8 *data, int length)
+{
+ int i;
+
+ writeb(I2C_CR_MEN | I2C_CR_MSTA |
+ ((length == 1) ? I2C_CR_TXAK : 0),
+ &I2C->cr);
+
+ /* dummy read */
+ readb(&I2C->dr);
+
+ for (i=0; i < length; i++) {
+ if (i2c_wait (I2C_READ) < 0)
+ break;
+
+ /* Generate ack on last next to last byte */
+ if (i == length - 2)
+ writeb(I2C_CR_MEN | I2C_CR_MSTA |
+ I2C_CR_TXAK,
+ &I2C->cr);
+
+ /* Generate stop on last byte */
+ if (i == length - 1)
+ writeb(I2C_CR_MEN | I2C_CR_TXAK, &I2C->cr);
+
+ data[i] = readb(&I2C->dr);
+ }
+ return i;
+}
+
+int
+i2c_read (u8 dev, uint addr, int alen, u8 *data, int length)
+{
+ int i = 0;
+ u8 *a = (u8*)&addr;
+
+ if (i2c_wait4bus () < 0)
+ goto exit;
+
+ if (i2c_write_addr (dev, I2C_WRITE, 0) == 0)
+ goto exit;
+
+ if (__i2c_write (&a[4 - alen], alen) != alen)
+ goto exit;
+
+ if (i2c_write_addr (dev, I2C_READ, 1) == 0)
+ goto exit;
+
+ i = __i2c_read (data, length);
+
+ exit:
+ writeb(I2C_CR_MEN, &I2C->cr);
+ return !(i == length);
+}
+
+int
+i2c_write (u8 dev, uint addr, int alen, u8 *data, int length)
+{
+ int i = 0;
+ u8 *a = (u8*)&addr;
+
+ if (i2c_wait4bus () < 0)
+ goto exit;
+
+ if (i2c_write_addr (dev, I2C_WRITE, 0) == 0)
+ goto exit;
+
+ if (__i2c_write (&a[4 - alen], alen) != alen)
+ goto exit;
+
+ i = __i2c_write (data, length);
+
+ exit:
+ writeb(I2C_CR_MEN, &I2C->cr);
+ return !(i == length);
+}
+
+int i2c_probe (uchar chip)
+{
+ int tmp;
+
+ /*
+ * Try to read the first location of the chip. The underlying
+ * driver doesn't appear to support sending just the chip address
+ * and looking for an <ACK> back.
+ */
+ udelay(10000);
+ return i2c_read (chip, 0, 1, (char *)&tmp, 1);
+}
+
+uchar i2c_reg_read (uchar i2c_addr, uchar reg)
+{
+ char buf[1];
+
+ i2c_read (i2c_addr, reg, 1, buf, 1);
+
+ return (buf[0]);
+}
+
+void i2c_reg_write (uchar i2c_addr, uchar reg, uchar val)
+{
+ i2c_write (i2c_addr, reg, 1, &val, 1);
+}
+
+#endif /* CONFIG_HARD_I2C */