diff options
Diffstat (limited to 'cpu/mpc824x/drivers/i2c/i2c.c')
| -rw-r--r-- | cpu/mpc824x/drivers/i2c/i2c.c | 270 |
1 files changed, 0 insertions, 270 deletions
diff --git a/cpu/mpc824x/drivers/i2c/i2c.c b/cpu/mpc824x/drivers/i2c/i2c.c deleted file mode 100644 index 637ae4c..0000000 --- a/cpu/mpc824x/drivers/i2c/i2c.c +++ /dev/null @@ -1,270 +0,0 @@ -/* - * (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> - -#undef I2CDBG - -#ifdef CONFIG_HARD_I2C -#include <i2c.h> - -#define TIMEOUT (CONFIG_SYS_HZ/4) - -#define I2C_Addr ((unsigned *)(CONFIG_SYS_EUMB_ADDR + 0x3000)) - -#define I2CADR &I2C_Addr[0] -#define I2CFDR &I2C_Addr[1] -#define I2CCCR &I2C_Addr[2] -#define I2CCSR &I2C_Addr[3] -#define I2CCDR &I2C_Addr[4] - -#define MPC107_CCR_MEN 0x80 -#define MPC107_CCR_MIEN 0x40 -#define MPC107_CCR_MSTA 0x20 -#define MPC107_CCR_MTX 0x10 -#define MPC107_CCR_TXAK 0x08 -#define MPC107_CCR_RSTA 0x04 - -#define MPC107_CSR_MCF 0x80 -#define MPC107_CSR_MAAS 0x40 -#define MPC107_CSR_MBB 0x20 -#define MPC107_CSR_MAL 0x10 -#define MPC107_CSR_SRW 0x04 -#define MPC107_CSR_MIF 0x02 -#define MPC107_CSR_RXAK 0x01 - -#define I2C_READ 1 -#define I2C_WRITE 0 - -/* taken from linux include/asm-ppc/io.h */ -inline unsigned in_le32 (volatile unsigned *addr) -{ - unsigned ret; - - __asm__ __volatile__ ("lwbrx %0,0,%1;\n" - "twi 0,%0,0;\n" - "isync":"=r" (ret): "r" (addr), "m" (*addr)); - return ret; -} - -inline void out_le32 (volatile unsigned *addr, int val) -{ - __asm__ __volatile__ ("stwbrx %1,0,%2; eieio":"=m" (*addr):"r" (val), - "r" (addr)); -} - -#define writel(val, addr) out_le32(addr, val) -#define readl(addr) in_le32(addr) - -void i2c_init (int speed, int slaveadd) -{ - /* stop I2C controller */ - writel (0x0, I2CCCR); - /* set clock */ - writel (0x1020, I2CFDR); - /* write slave address */ - writel (slaveadd, I2CADR); - /* clear status register */ - writel (0x0, I2CCSR); - /* start I2C controller */ - writel (MPC107_CCR_MEN, I2CCCR); - - return; -} - -static __inline__ int i2c_wait4bus (void) -{ - ulong timeval = get_timer (0); - - while (readl (I2CCSR) & MPC107_CSR_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 = readl (I2CCSR); - - if (!(csr & MPC107_CSR_MIF)) - continue; - - writel (0x0, I2CCSR); - - if (csr & MPC107_CSR_MAL) { -#ifdef I2CDBG - printf ("i2c_wait: MAL\n"); -#endif - return -1; - } - - if (!(csr & MPC107_CSR_MCF)) { -#ifdef I2CDBG - printf ("i2c_wait: unfinished\n"); -#endif - return -1; - } - - if (write == I2C_WRITE && (csr & MPC107_CSR_RXAK)) { -#ifdef I2CDBG - printf ("i2c_wait: No RXACK\n"); -#endif - return -1; - } - - return 0; - } while (get_timer (timeval) < TIMEOUT); - -#ifdef I2CDBG - printf ("i2c_wait: timed out\n"); -#endif - return -1; -} - -static __inline__ int i2c_write_addr (u8 dev, u8 dir, int rsta) -{ - writel (MPC107_CCR_MEN | MPC107_CCR_MSTA | MPC107_CCR_MTX | - (rsta ? MPC107_CCR_RSTA : 0), I2CCCR); - - writel ((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; - - writel (MPC107_CCR_MEN | MPC107_CCR_MSTA | MPC107_CCR_MTX, I2CCCR); - - for (i = 0; i < length; i++) { - writel (data[i], I2CCDR); - - if (i2c_wait (I2C_WRITE) < 0) - break; - } - - return i; -} - -static __inline__ int __i2c_read (u8 * data, int length) -{ - int i; - - writel (MPC107_CCR_MEN | MPC107_CCR_MSTA | - ((length == 1) ? MPC107_CCR_TXAK : 0), I2CCCR); - - /* dummy read */ - readl (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) - writel (MPC107_CCR_MEN | MPC107_CCR_MSTA | - MPC107_CCR_TXAK, I2CCCR); - - /* Generate stop on last byte */ - if (i == length - 1) - writel (MPC107_CCR_MEN | MPC107_CCR_TXAK, I2CCCR); - - data[i] = readl (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: - writel (MPC107_CCR_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: - writel (MPC107_CCR_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); -} - -#endif /* CONFIG_HARD_I2C */ |