various changes to VCMA9 board specific files * Add I2C support for MGT5100 / MPC5200master
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/*
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* (C) Copyright 2003 |
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de. |
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* |
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* See file CREDITS for list of people who contributed to this |
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* project. |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as |
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* published by the Free Software Foundation; either version 2 of |
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* the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, |
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* MA 02111-1307 USA |
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*/ |
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#include <common.h> |
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#ifdef CONFIG_HARD_I2C |
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#include <mpc5xxx.h> |
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#include <i2c.h> |
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#ifdef CFG_I2C_MODULE |
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#define I2C_BASE MPC5XXX_I2C2 |
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#else |
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#define I2C_BASE MPC5XXX_I2C1 |
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#endif |
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#define I2C_TIMEOUT 100 |
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#define I2C_RETRIES 3 |
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static int mpc_reg_in (volatile u32 *reg); |
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static void mpc_reg_out (volatile u32 *reg, int val, int mask); |
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static int wait_for_bb (void); |
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static int wait_for_pin (int *status); |
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static int do_address (uchar chip, char rdwr_flag); |
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static int send_bytes (uchar chip, char *buf, int len); |
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static int receive_bytes (uchar chip, char *buf, int len); |
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static int mpc_reg_in(volatile u32 *reg) |
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{ |
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return *reg >> 24; |
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__asm__ __volatile__ ("eieio"); |
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} |
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static void mpc_reg_out(volatile u32 *reg, int val, int mask) |
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{ |
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int tmp; |
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if (!mask) { |
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*reg = val << 24; |
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} else { |
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tmp = mpc_reg_in(reg); |
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*reg = ((tmp & ~mask) | (val & mask)) << 24; |
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} |
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__asm__ __volatile__ ("eieio"); |
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return; |
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} |
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static int wait_for_bb(void) |
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{ |
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struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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int timeout = I2C_TIMEOUT; |
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int status; |
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status = mpc_reg_in(®s->msr); |
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while (timeout-- && (status & I2C_BB)) { |
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#if 1 |
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volatile int temp; |
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mpc_reg_out(®s->mcr, I2C_STA, I2C_STA); |
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temp = mpc_reg_in(®s->mdr); |
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mpc_reg_out(®s->mcr, 0, I2C_STA); |
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mpc_reg_out(®s->mcr, 0, 0); |
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mpc_reg_out(®s->mcr, I2C_EN, 0); |
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#endif |
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udelay(1000); |
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status = mpc_reg_in(®s->msr); |
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} |
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return (status & I2C_BB); |
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} |
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static int wait_for_pin(int *status) |
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{ |
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struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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int timeout = I2C_TIMEOUT; |
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*status = mpc_reg_in(®s->msr); |
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while (timeout-- && !(*status & I2C_IF)) { |
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udelay(1000); |
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*status = mpc_reg_in(®s->msr); |
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} |
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if (!(*status & I2C_IF)) { |
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return -1; |
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} |
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mpc_reg_out(®s->msr, 0, I2C_IF); |
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return 0; |
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} |
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static int do_address(uchar chip, char rdwr_flag) |
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{ |
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struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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int status; |
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chip <<= 1; |
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if (rdwr_flag) { |
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chip |= 1; |
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} |
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mpc_reg_out(®s->mcr, I2C_TX, I2C_TX); |
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mpc_reg_out(®s->mdr, chip, 0); |
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if (wait_for_pin(&status)) { |
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return -2; |
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} |
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if (status & I2C_RXAK) { |
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return -3; |
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} |
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return 0; |
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} |
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static int send_bytes(uchar chip, char *buf, int len) |
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{ |
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struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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int wrcount; |
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int status; |
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for (wrcount = 0; wrcount < len; ++wrcount) { |
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mpc_reg_out(®s->mdr, buf[wrcount], 0); |
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if (wait_for_pin(&status)) { |
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break; |
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} |
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if (status & I2C_RXAK) { |
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break; |
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} |
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} |
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return !(wrcount == len); |
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} |
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static int receive_bytes(uchar chip, char *buf, int len) |
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{ |
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struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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int dummy = 1; |
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int rdcount = 0; |
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int status; |
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int i; |
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mpc_reg_out(®s->mcr, 0, I2C_TX); |
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for (i = 0; i < len; ++i) { |
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buf[rdcount] = mpc_reg_in(®s->mdr); |
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if (dummy) { |
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dummy = 0; |
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} else { |
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rdcount++; |
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} |
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if (wait_for_pin(&status)) { |
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return -4; |
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} |
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} |
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mpc_reg_out(®s->mcr, I2C_TXAK, I2C_TXAK); |
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buf[rdcount++] = mpc_reg_in(®s->mdr); |
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if (wait_for_pin(&status)) { |
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return -5; |
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} |
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mpc_reg_out(®s->mcr, 0, I2C_TXAK); |
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return 0; |
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} |
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/**************** I2C API ****************/ |
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void i2c_init(int speed, int saddr) |
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{ |
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struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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mpc_reg_out(®s->mcr, 0, 0); |
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mpc_reg_out(®s->madr, saddr << 1, 0); |
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/* Set clock
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*/ |
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mpc_reg_out(®s->mfdr, speed, 0); |
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/* Enable module
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*/ |
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mpc_reg_out(®s->mcr, I2C_EN, I2C_INIT_MASK); |
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mpc_reg_out(®s->msr, 0, I2C_IF); |
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return; |
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} |
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int i2c_probe(uchar chip) |
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{ |
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struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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int i; |
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for (i = 0; i < I2C_RETRIES; i++) { |
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mpc_reg_out(®s->mcr, I2C_STA, I2C_STA); |
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if (! do_address(chip, 0)) { |
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mpc_reg_out(®s->mcr, 0, I2C_STA); |
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break; |
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} |
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mpc_reg_out(®s->mcr, 0, I2C_STA); |
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udelay(500); |
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} |
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return (i == I2C_RETRIES); |
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} |
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int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len) |
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{ |
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uchar xaddr[4]; |
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struct mpc5xxx_i2c * regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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int ret = -1; |
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xaddr[0] = (addr >> 24) & 0xFF; |
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xaddr[1] = (addr >> 16) & 0xFF; |
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xaddr[2] = (addr >> 8) & 0xFF; |
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xaddr[3] = addr & 0xFF; |
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if (wait_for_bb()) { |
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printf("i2c_read: bus is busy\n"); |
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goto Done; |
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} |
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mpc_reg_out(®s->mcr, I2C_STA, I2C_STA); |
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if (do_address(chip, 0)) { |
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printf("i2c_read: failed to address chip\n"); |
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goto Done; |
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} |
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if (send_bytes(chip, &xaddr[4-alen], alen)) { |
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printf("i2c_read: send_bytes failed\n"); |
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goto Done; |
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} |
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mpc_reg_out(®s->mcr, I2C_RSTA, I2C_RSTA); |
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if (do_address(chip, 1)) { |
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printf("i2c_read: failed to address chip\n"); |
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goto Done; |
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} |
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if (receive_bytes(chip, buf, len)) { |
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printf("i2c_read: receive_bytes failed\n"); |
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goto Done; |
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} |
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ret = 0; |
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Done: |
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mpc_reg_out(®s->mcr, 0, I2C_STA); |
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return ret; |
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} |
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int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len) |
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{ |
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uchar xaddr[4]; |
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struct mpc5xxx_i2c *regs = (struct mpc5xxx_i2c *)I2C_BASE; |
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int ret = -1; |
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xaddr[0] = (addr >> 24) & 0xFF; |
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xaddr[1] = (addr >> 16) & 0xFF; |
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xaddr[2] = (addr >> 8) & 0xFF; |
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xaddr[3] = addr & 0xFF; |
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if (wait_for_bb()) { |
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printf("i2c_write: bus is busy\n"); |
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goto Done; |
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} |
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mpc_reg_out(®s->mcr, I2C_STA, I2C_STA); |
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if (do_address(chip, 0)) { |
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printf("i2c_write: failed to address chip\n"); |
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goto Done; |
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} |
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if (send_bytes(chip, &xaddr[4-alen], alen)) { |
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printf("i2c_write: send_bytes failed\n"); |
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goto Done; |
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} |
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if (send_bytes(chip, buf, len)) { |
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printf("i2c_write: send_bytes failed\n"); |
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goto Done; |
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} |
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ret = 0; |
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Done: |
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mpc_reg_out(®s->mcr, 0, I2C_STA); |
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return ret; |
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} |
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uchar i2c_reg_read(uchar chip, uchar reg) |
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{ |
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char buf; |
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i2c_read(chip, reg, 1, &buf, 1); |
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return buf; |
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} |
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void i2c_reg_write(uchar chip, uchar reg, uchar val) |
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{ |
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i2c_write(chip, reg, 1, &val, 1); |
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return; |
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} |
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#endif /* CONFIG_HARD_I2C */ |
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