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authorStefan Roese <sr@denx.de>2006-11-10 07:48:47 +0100
committerStefan Roese <sr@denx.de>2006-11-10 07:48:47 +0100
commitdfc8a9ee0040e53ada125a3c52f241e37f09cf28 (patch)
tree60fd3973150a4e6b3d9d129d117ecab71b5edabe /cpu/mpc85xx/i2c.c
parent5c912cb1c31266c66ca59b36f9b6f87296421d75 (diff)
parent91650b3e4de688038d4f71279c44858e3e2c6870 (diff)
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Merge with /home/stefan/git/u-boot/denx
Diffstat (limited to 'cpu/mpc85xx/i2c.c')
-rw-r--r--cpu/mpc85xx/i2c.c265
1 files changed, 0 insertions, 265 deletions
diff --git a/cpu/mpc85xx/i2c.c b/cpu/mpc85xx/i2c.c
deleted file mode 100644
index 32dcf5d..0000000
--- a/cpu/mpc85xx/i2c.c
+++ /dev/null
@@ -1,265 +0,0 @@
-/*
- * (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
- */
-
-#include <common.h>
-#include <command.h>
-#include <asm/io.h>
-
-#ifdef CONFIG_HARD_I2C
-#include <i2c.h>
-
-#define TIMEOUT (CFG_HZ/4)
-
-#define I2C_Addr ((u8 *)(CFG_CCSRBAR + 0x3000))
-
-#define I2CADR &I2C_Addr[0]
-#define I2CFDR &I2C_Addr[4]
-#define I2CCCR &I2C_Addr[8]
-#define I2CCSR &I2C_Addr[12]
-#define I2CCDR &I2C_Addr[16]
-#define I2CDFSRR &I2C_Addr[20]
-
-#define I2C_READ 1
-#define I2C_WRITE 0
-
-void
-i2c_init(int speed, int slaveadd)
-{
- /* stop I2C controller */
- writeb(0x0, I2CCCR);
-
- /* set clock */
- writeb(0x3f, I2CFDR);
-
- /* set default filter */
- writeb(0x10,I2CDFSRR);
-
- /* write slave address */
- writeb(slaveadd, I2CADR);
-
- /* clear status register */
- writeb(0x0, I2CCSR);
-
- /* start I2C controller */
- writeb(MPC85xx_I2CCR_MEN, I2CCCR);
-}
-
-static __inline__ int
-i2c_wait4bus (void)
-{
- ulong timeval = get_timer (0);
-
- while (readb(I2CCSR) & MPC85xx_I2CSR_MBB) {
- if (get_timer (timeval) > TIMEOUT) {
- return -1;
- }
- }
-
- return 0;
-}
-
-static __inline__ int
-i2c_wait (int write)
-{
- u32 csr;
- ulong timeval = get_timer (0);
-
- do {
- csr = readb(I2CCSR);
-
- if (!(csr & MPC85xx_I2CSR_MIF))
- continue;
-
- writeb(0x0, I2CCSR);
-
- if (csr & MPC85xx_I2CSR_MAL) {
- debug("i2c_wait: MAL\n");
- return -1;
- }
-
- if (!(csr & MPC85xx_I2CSR_MCF)) {
- debug("i2c_wait: unfinished\n");
- return -1;
- }
-
- if (write == I2C_WRITE && (csr & MPC85xx_I2CSR_RXAK)) {
- debug("i2c_wait: No RXACK\n");
- return -1;
- }
-
- return 0;
- } while (get_timer (timeval) < TIMEOUT);
-
- debug("i2c_wait: timed out\n");
- return -1;
-}
-
-static __inline__ int
-i2c_write_addr (u8 dev, u8 dir, int rsta)
-{
- writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | MPC85xx_I2CCR_MTX |
- (rsta?MPC85xx_I2CCR_RSTA:0),
- I2CCCR);
-
- writeb((dev << 1) | dir, I2CCDR);
-
- if (i2c_wait (I2C_WRITE) < 0)
- return 0;
-
- return 1;
-}
-
-static __inline__ int
-__i2c_write (u8 *data, int length)
-{
- int i;
-
- writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA | MPC85xx_I2CCR_MTX,
- I2CCCR);
-
- for (i=0; i < length; i++) {
- writeb(data[i], I2CCDR);
-
- if (i2c_wait (I2C_WRITE) < 0)
- break;
- }
-
- return i;
-}
-
-static __inline__ int
-__i2c_read (u8 *data, int length)
-{
- int i;
-
- writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA |
- ((length == 1) ? MPC85xx_I2CCR_TXAK : 0),
- I2CCCR);
-
- /* dummy read */
- readb(I2CCDR);
-
- 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(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_MSTA |
- MPC85xx_I2CCR_TXAK,
- I2CCCR);
-
- /* Generate stop on last byte */
- if (i == length - 1)
- writeb(MPC85xx_I2CCR_MEN | MPC85xx_I2CCR_TXAK, I2CCCR);
-
- data[i] = readb(I2CCDR);
- }
-
- 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(MPC85xx_I2CCR_MEN, I2CCCR);
-
- 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(MPC85xx_I2CCR_MEN, I2CCCR);
-
- 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, (uchar *)&tmp, 1);
-}
-
-uchar i2c_reg_read (uchar i2c_addr, uchar reg)
-{
- uchar 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 */