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wifipineapple-openwrt/target/linux/coldfire/patches/025-Add-I2C-driver-for-MCF5...

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From a7c7130d916c1f7e0d27ad9b338912496ad53089 Mon Sep 17 00:00:00 2001
From: Alison Wang <b18965@freescale.com>
Date: Thu, 4 Aug 2011 09:59:46 +0800
Subject: [PATCH 25/52] Add I2C driver for MCF5445x/MCF547x/MCF548x.
Add common I2C driver for MCF5445x/MCF547x/MCF548x and add I2C slave
mode support for MCF5445x.
Configure I2C adaptor as slave mode and Support I2C adaptor as a
"eeprom-like" slave device.
Signed-off-by: Alison Wang <b18965@freescale.com>
---
arch/m68k/include/asm/mcfi2c.h | 57 +++
drivers/i2c/busses/Kconfig | 24 ++
drivers/i2c/busses/Makefile | 2 +
drivers/i2c/busses/i2c-algo-mcf.h | 23 ++
drivers/i2c/busses/i2c-mcf-slave.c | 358 ++++++++++++++++++
drivers/i2c/busses/i2c-mcf.c | 698 ++++++++++++++++++++++++++++++++++++
6 files changed, 1162 insertions(+), 0 deletions(-)
create mode 100644 arch/m68k/include/asm/mcfi2c.h
create mode 100644 drivers/i2c/busses/i2c-algo-mcf.h
create mode 100644 drivers/i2c/busses/i2c-mcf-slave.c
create mode 100644 drivers/i2c/busses/i2c-mcf.c
--- /dev/null
+++ b/arch/m68k/include/asm/mcfi2c.h
@@ -0,0 +1,57 @@
+/*
+ * mcfi2c.h -- ColdFire mcfv4/mcfv4e i2c controller support.
+ * Copyright (C) 2009-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ */
+#ifndef MCF_I2C_H
+#define MCF_I2C_H
+
+/* Register read/write macros */
+#if defined(CONFIG_M547X_8X)
+#define MCF_I2AR MCF_REG08(0x008F00) /* I2C Address */
+#define MCF_I2FDR MCF_REG08(0x008F04) /* I2C Frequency Divider */
+#define MCF_I2CR MCF_REG08(0x008F08) /* I2C Control */
+#define MCF_I2SR MCF_REG08(0x008F0C) /* I2C Status */
+#define MCF_I2DR MCF_REG08(0x008F10) /* I2C Data I/O */
+#define MCF_I2ICR MCF_REG08(0x008F20) /* I2C Interrupt Control */
+#elif defined(CONFIG_M5445X) || defined(CONFIG_M5441X)
+#define MCF_I2AR (*(volatile u8 *)(0xFC058000)) /* I2C Address */
+/* I2C Frequency Divider */
+#define MCF_I2FDR (*(volatile u8 *)(0xFC058004))
+#define MCF_I2CR (*(volatile u8 *)(0xFC058008)) /* I2C Control */
+#define MCF_I2SR (*(volatile u8 *)(0xFC05800C)) /* I2C Status */
+#define MCF_I2DR (*(volatile u8 *)(0xFC058010)) /* I2C Data I/O */
+#endif
+
+/* Bit definitions and macros for MCF_I2C_I2AR */
+#define MCF_I2AR_ADR(x) (((x)&0x7F)<<1)
+
+/* Bit definitions and macros for MCF_I2C_I2FDR */
+#define MCF_I2FDR_IC(x) (((x)&0x3F)<<0)
+
+/* Bit definitions and macros for MCF_I2C_I2CR */
+#define MCF_I2CR_RSTA (0x04)
+#define MCF_I2CR_TXAK (0x08)
+#define MCF_I2CR_MTX (0x10)
+#define MCF_I2CR_MSTA (0x20)
+#define MCF_I2CR_IIEN (0x40)
+#define MCF_I2CR_IEN (0x80)
+
+/* Bit definitions and macros for MCF_I2C_I2SR */
+#define MCF_I2SR_RXAK (0x01)
+#define MCF_I2SR_IIF (0x02)
+#define MCF_I2SR_SRW (0x04)
+#define MCF_I2SR_IAL (0x10)
+#define MCF_I2SR_IBB (0x20)
+#define MCF_I2SR_IAAS (0x40)
+#define MCF_I2SR_ICF (0x80)
+
+/* Bit definitions and macros for MCF_I2C_I2ICR */
+#if defined(CONFIG_M547X_8X)
+#define MCF_I2ICR_IE (0x01)
+#define MCF_I2ICR_RE (0x02)
+#define MCF_I2ICR_TE (0x04)
+#define MCF_I2ICR_BNBE (0x08)
+#endif
+
+/********************************************************************/
+#endif
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -431,6 +431,30 @@ config I2C_IXP2000
This driver is deprecated and will be dropped soon. Use i2c-gpio
instead.
+config I2C_MCF
+ tristate "MCF ColdFire I2C Interface"
+ depends on I2C && COLDFIRE
+ help
+ If you say yes to this option, support will be included for the
+ I2C on most ColdFire CPUs
+
+ This driver can also be built as a module. If so, the module
+ will be called i2c-mcf.
+
+config I2C_MCF_SLAVE
+ tristate "MCF ColdFire I2C Slave Interface"
+ depends on !(I2C_MCF)
+ default n
+ help
+ mcf i2c adapter slave mode, only supported on mcf5445x platform.
+
+config I2C_SLAVE_TEST
+ bool "I2C Slave Mode Test Configuration"
+ depends on I2C_MCF_SLAVE
+ default y
+ help
+ This configuration help to test I2C slave mode
+
config I2C_MPC
tristate "MPC107/824x/85xx/512x/52xx/83xx/86xx"
depends on PPC32
--- a/drivers/i2c/busses/Makefile
+++ b/drivers/i2c/busses/Makefile
@@ -77,5 +77,7 @@ obj-$(CONFIG_I2C_SIBYTE) += i2c-sibyte.o
obj-$(CONFIG_I2C_STUB) += i2c-stub.o
obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
+obj-$(CONFIG_I2C_MCF) += i2c-mcf.o
+obj-$(CONFIG_I2C_MCF_SLAVE) += i2c-mcf-slave.o
ccflags-$(CONFIG_I2C_DEBUG_BUS) := -DDEBUG
--- /dev/null
+++ b/drivers/i2c/busses/i2c-algo-mcf.h
@@ -0,0 +1,23 @@
+#ifndef I2C_ALGO_MCF_H
+#define I2C_ALGO_MCF_H 1
+
+/* --- Defines for pcf-adapters --------------------------------------- */
+#include <linux/i2c.h>
+
+struct i2c_algo_mcf_data {
+ void *data; /* private data for lolevel routines */
+ void (*setmcf) (void *data, int ctl, int val);
+ int (*getmcf) (void *data, int ctl);
+ int (*getown) (void *data);
+ int (*getclock) (void *data);
+ void (*waitforpin) (void);
+ /* local settings */
+ int udelay;
+ int mdelay;
+ int timeout;
+};
+
+int i2c_mcf_add_bus(struct i2c_adapter *);
+int i2c_mcf_del_bus(struct i2c_adapter *);
+
+#endif /* I2C_ALGO_MCF_H */
--- /dev/null
+++ b/drivers/i2c/busses/i2c-mcf-slave.c
@@ -0,0 +1,358 @@
+/*
+ * i2c-mcf-slave.c - support adpater slave mode, now only support
+ * mcf5445x platform
+ *
+ * Copyright (C) 2009-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Lanttor Guo <lanttor.guo@freescale.com>
+ *
+ * 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.
+*/
+
+#ifdef CONFIG_I2C_SLAVE_TEST
+#define DEBUG
+#endif
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/proc_fs.h>
+#include <linux/types.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/irq.h>
+#include <asm/mcfi2c.h>
+#if defined(CONFIG_M5445X)
+#include <asm/mcf5445x_intc.h>
+#endif
+
+#define IRQ (64+30)
+#define SLAVE_HANDLER_NAME "mcf-i2c slave handler"
+#define I2C_BUFFER_SIZE 50
+
+/* Structure for storing I2C transfer data */
+struct i2c_buffer {
+ int tx_index; /* TX index */
+ int rx_index; /* RX index */
+ u16 length; /* Length of the buffer in bytes */
+ u8 buf[I2C_BUFFER_SIZE]; /* Data buffer */
+};
+
+struct i2c_buffer i2c_tx_buffer;
+struct i2c_buffer i2c_rx_buffer;
+
+u8 *tx_string = "abcdefghijklmnopqrstuvwxyz0123456789)!@#$%^&*([].";
+
+/*
+ * I2C slave mode interrupt handler
+ *
+ */
+static irqreturn_t i2c_slave_handler(int this_irq, void *dev_id)
+{
+ u8 dummy_read;
+ int tmp_index;
+
+#ifdef DEBUG
+ printk(KERN_INFO "i2c adapter slave mode irq handler.\n");
+#endif
+
+ /* Clear I2C interupt flag */
+ MCF_I2SR = ~MCF_I2SR_IIF;
+
+ /* Check if this device is in Master or Slave Mode. */
+ if (MCF_I2CR & MCF_I2CR_MSTA) {
+ /* Master mode, do nothing here */
+ printk(KERN_INFO "i2c master mode at %s(), do nothing!\n",
+ __func__);
+ return IRQ_NONE;
+ } else {
+ /* Slave Mode - Check if Arbitration Lost. */
+ if (MCF_I2SR & MCF_I2SR_IAL) {
+
+ #ifdef DEBUG
+ printk(KERN_INFO "Arbitration Lost.\n");
+ #endif
+
+ /* Clear IAL bit */
+ MCF_I2SR &= ~MCF_I2SR_IAL;
+
+ /* Arbitration Lost -
+ * Check if this device is being addressed as slave.
+ *(If not, nothing more needs to be done.)
+ */
+ if (MCF_I2SR & MCF_I2SR_IAAS) {
+ /* Addressed as slave -
+ * Check if master was reading from slave or
+ * writing to slave.
+ */
+ if (MCF_I2SR & MCF_I2SR_SRW) {
+ /* Set tx_index to 0 */
+ if (i2c_tx_buffer.length == 0) {
+ i2c_tx_buffer.length =
+ I2C_BUFFER_SIZE;
+ i2c_tx_buffer.tx_index = 0;
+ }
+
+ /* Master was reading from slave -
+ * Set Transmit Mode.
+ */
+ MCF_I2CR |= MCF_I2CR_MTX;
+
+ /* Write data to MBDR. */
+ tmp_index = i2c_tx_buffer.tx_index++;
+ MCF_I2DR = i2c_tx_buffer.buf[tmp_index];
+ i2c_tx_buffer.length--;
+
+ #ifdef DEBUG
+ printk(KERN_INFO "Arbitration Lost: "
+ "Addressed as slave - "
+ "TX mode.\n");
+ #endif
+ } else {
+ /* Set rx_index to 0 */
+ i2c_rx_buffer.rx_index = 0;
+
+ /* Master was writing to slave -
+ Set Receive Mode. */
+ MCF_I2CR &= ~MCF_I2CR_MTX;
+
+ /* Dummy read from MBDR, to clear
+ the ICF bit. */
+ dummy_read = MCF_I2DR;
+
+ #ifdef DEBUG
+ printk(KERN_INFO "Arbitration Lost: "
+ "Addressed as slave - "
+ "RX mode.\n");
+ #endif
+ }
+ }
+
+ } else {
+ /* Arbitration Not Lost - Check if data byte is this
+ devices's Slave Address byte. */
+ if (MCF_I2SR & MCF_I2SR_IAAS) {
+ /* Data byte is Slave Address byte -
+ Check Slave Read/Write bit. */
+ if (MCF_I2SR & MCF_I2SR_SRW) {
+ /* Set tx_index to 0 */
+ if (i2c_tx_buffer.length == 0) {
+ i2c_tx_buffer.length =
+ I2C_BUFFER_SIZE;
+ i2c_tx_buffer.tx_index = 0;
+ }
+
+ /* Master was reading from slave -
+ Set Transmit Mode. */
+ MCF_I2CR |= MCF_I2CR_MTX;
+
+ /* Write data to MBDR. */
+ tmp_index = i2c_tx_buffer.tx_index++;
+ MCF_I2DR = i2c_tx_buffer.buf[tmp_index];
+ i2c_tx_buffer.length--;
+
+ #ifdef DEBUG
+ tmp_index = i2c_tx_buffer.tx_index - 1;
+ printk(KERN_INFO "Slave TX: First byte"
+ " - 0x%02X\n",
+ i2c_tx_buffer.buf[tmp_index]);
+ #endif
+ } else {
+ /* Master has specified Slave Receive
+ Mode. Set Receive Mode. (Writing to
+ MBCR clears IAAS.) */
+
+ /* Set rx_index to 0 */
+ i2c_rx_buffer.rx_index = 0;
+
+ MCF_I2CR &= ~MCF_I2CR_MTX;
+
+ /* Dummy read from MBDR, to clear
+ the ICF bit. */
+ dummy_read = MCF_I2DR;
+
+ #ifdef DEBUG
+ printk(KERN_INFO "Slave RX: Receive "
+ "address.\n");
+ #endif
+ }
+ } else {
+ /* Data byte received is not Slave Address byte
+ Check if this device is in Transmit or
+ Receive Mode. */
+ if (MCF_I2CR & MCF_I2CR_MTX) {
+ /* Last byte received? */
+ if (MCF_I2SR & MCF_I2SR_RXAK) {
+ MCF_I2CR &= ~MCF_I2CR_MTX;
+ dummy_read = MCF_I2DR;
+
+ #ifdef DEBUG
+ printk(KERN_INFO "Slave TX: "
+ "Last byte has been "
+ "sent.\n");
+ #endif
+ } else {
+ /* Write data to MBDR. */
+ tmp_index =
+ i2c_tx_buffer.tx_index++;
+ MCF_I2DR =
+ i2c_tx_buffer.buf[tmp_index];
+ i2c_tx_buffer.length--;
+
+ if (i2c_tx_buffer.length == 0) {
+ i2c_tx_buffer.length =
+ I2C_BUFFER_SIZE;
+ i2c_tx_buffer.tx_index =
+ 0;
+ }
+
+ }
+ } else {
+ /* Receive Mode - Read data from
+ MBDR and store it. */
+ tmp_index = i2c_rx_buffer.rx_index++;
+ i2c_rx_buffer.buf[tmp_index] = MCF_I2DR;
+ i2c_rx_buffer.length++;
+ }
+ }
+ }
+ return IRQ_HANDLED;
+ }
+}
+
+#ifdef CONFIG_PROC_FS
+
+/*
+ * Info exported via "/proc/driver/i2c".
+ */
+
+static int gen_i2c_proc_output(char *buf)
+{
+ char *p;
+
+ p = buf;
+ p += sprintf(p,
+ "I2CR: 0x%x\n"
+ "I2SR: 0x%x\n"
+ "I2DR: 0x%x\n",
+ MCF_I2CR, MCF_I2SR, MCF_I2DR);
+
+ return p - buf;
+}
+
+static int gen_i2c_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int len = gen_i2c_proc_output(page);
+ if (len <= off+count)
+ *eof = 1;
+ *start = page + off;
+ len -= off;
+ if (len > count)
+ len = count;
+ if (len < 0)
+ len = 0;
+ return len;
+}
+
+static int __init gen_i2c_proc_init(void)
+{
+ struct proc_dir_entry *r;
+
+ r = create_proc_read_entry("driver/i2c-adaptor-register", 0, NULL,
+ gen_i2c_read_proc, NULL);
+ if (!r)
+ return -ENOMEM;
+ return 0;
+}
+#else
+static inline int gen_i2c_proc_init(void) { return 0; }
+#endif /* CONFIG_PROC_FS */
+
+/*
+ * Initalize I2C module
+ */
+static int __init i2c_coldfire_init(void)
+{
+ int retval;
+ u8 dummy_read;
+
+#ifdef DEBUG
+ printk(KERN_INFO "init i2c adaptor slave mode!\n");
+#endif
+
+ /* Initialize the tx buffer */
+ strcpy((char *)&i2c_tx_buffer.buf, (const char *)tx_string);
+ i2c_tx_buffer.length = I2C_BUFFER_SIZE;
+
+#if defined(CONFIG_M5445X)
+ /*
+ * Initialize the GPIOs for I2C
+ */
+ MCF_GPIO_PAR_FECI2C |= (0
+ | MCF_GPIO_PAR_FECI2C_PAR_SDA(3)
+ | MCF_GPIO_PAR_FECI2C_PAR_SCL(3));
+#endif
+
+ /* Set transmission frequency 0x19 = ~100kHz */
+ MCF_I2FDR = 0x19;
+
+ /* set the I2C slave address */
+ MCF_I2AR = 0x6A;
+
+ /* Enable I2C module and if IBB is set, do the special initialzation */
+ /* procedures as are documented */
+
+ if ((MCF_I2SR & MCF_I2SR_IBB) == 1) {
+ printk(KERN_INFO "%s - do special I2C init procedures\n",
+ __func__);
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0xA0;
+ dummy_read = MCF_I2DR;
+ MCF_I2SR = 0x00;
+ MCF_I2CR = 0x00;
+ }
+
+ MCF_I2CR |= (MCF_I2CR_IEN | MCF_I2CR_IIEN);
+
+ /* default I2C mode is - slave and receive */
+ MCF_I2CR &= ~(MCF_I2CR_MSTA | MCF_I2CR_MTX);
+
+ retval = request_irq(IRQ, i2c_slave_handler, IRQF_DISABLED,
+ SLAVE_HANDLER_NAME, NULL);
+ if (retval < 0)
+ printk(KERN_INFO "request_irq for i2c slave mode failed!\n");
+
+ retval = gen_i2c_proc_init();
+
+ if (retval < 0)
+ printk(KERN_INFO "gen /proc/i2c-adaptor-register for i2c slave mode failed!\n");
+
+ return retval;
+};
+
+/*
+ * I2C module exit function
+ */
+
+static void __exit i2c_coldfire_exit(void)
+{
+ /* disable I2C and Interrupt */
+ MCF_I2CR &= ~(MCF_I2CR_IEN | MCF_I2CR_IIEN);
+ free_irq(IRQ, NULL);
+
+};
+
+MODULE_DESCRIPTION("MCF5445x I2C adaptor slave mode support");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_coldfire_init);
+module_exit(i2c_coldfire_exit);
--- /dev/null
+++ b/drivers/i2c/busses/i2c-mcf.c
@@ -0,0 +1,698 @@
+/*
+ * Copyright (C) 2009-2011 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Lanttor.Guo@freescale.com
+ *
+ * I2C bus driver on mcfv4/mcfv4e platform
+ *
+ * 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.
+ */
+#include <linux/i2c.h>
+#include "i2c-algo-mcf.h"
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/proc_fs.h>
+
+#include <asm/coldfire.h>
+#include <asm/mcfi2c.h>
+
+#if defined(CONFIG_M547X_8X)
+#include <asm/m5485sim.h>
+#elif defined(CONFIG_M5445X) || defined(CONFIG_M5441X)
+#include <asm/mcfsim.h>
+#endif
+
+#define get_clock(adap) (clock)
+#define get_own(adap) (own)
+
+#if defined(CONFIG_M547X_8X)
+static int clock = 0x3b;
+#elif defined(CONFIG_M5445X) || defined(CONFIG_M5441X)
+static int clock = 0x19;
+#endif
+module_param(clock, int, 0);
+MODULE_PARM_DESC(clock,
+ "Set I2C clock in kHz: 400=fast mode (default == 100khz)");
+
+static int own = 0x78;
+module_param(own, int, 0);
+MODULE_PARM_DESC(clock, "Set I2C Master controller address");
+
+static struct i2c_algo_mcf_data i2c_mcf_board_data = {
+ .timeout = 10000,
+};
+
+static struct i2c_adapter i2c_mcf_board_adapter = {
+ .owner = THIS_MODULE,
+ .name = "mcf i2c adapter",
+ .algo_data = &i2c_mcf_board_data,
+ .class = I2C_CLASS_HWMON,
+ .timeout = 100,
+ .retries = 2
+};
+/*
+ * static void i2c_start()
+ *
+ * Generates START signal
+ */
+static void
+i2c_start(
+ struct i2c_algo_mcf_data *adap
+) {
+ MCF_I2CR |= MCF_I2CR_MSTA;
+}
+
+
+/*
+ * static void i2c_stop()
+ *
+ * Generates STOP signal
+ */
+static void
+i2c_stop(
+ struct i2c_algo_mcf_data *adap
+) {
+ MCF_I2CR &= ~MCF_I2CR_MSTA;
+}
+
+static int
+i2c_getack(
+ struct i2c_algo_mcf_data *adap
+) {
+ return !(MCF_I2SR & MCF_I2SR_RXAK);
+}
+
+/*
+ * static void wait_for_bb()
+ *
+ * Wait for bus idle state
+ */
+static int
+wait_for_bb(
+ struct i2c_algo_mcf_data *adap
+) {
+ int i;
+ for (i = 0; i < adap->timeout; i++) {
+ if (!(MCF_I2SR & MCF_I2SR_IBB))
+ return 0;
+ udelay(100);
+ }
+ printk(KERN_ERR "%s: timeout", __func__);
+ return -ETIMEDOUT;
+}
+
+/*
+ * static void wait_for_not_bb()
+ *
+ * Wait for bus busy state
+ */
+static int
+wait_for_not_bb(
+ struct i2c_algo_mcf_data *adap
+) {
+ int i;
+ for (i = 0; i < adap->timeout; i++) {
+ if (MCF_I2SR & MCF_I2SR_IBB)
+ return 0;
+ udelay(100);
+ }
+ printk(KERN_ERR "%s: timeout", __func__);
+ return -ETIMEDOUT;
+}
+
+/*
+ * static void wait_xfer_done()
+ *
+ * Wait for transfer to complete
+ */
+static int
+wait_xfer_done(
+ struct i2c_algo_mcf_data *adap
+) {
+ int i;
+
+ for (i = 0; i < adap->timeout; i++) {
+ if (MCF_I2SR & MCF_I2SR_IIF) {
+ MCF_I2SR &= ~MCF_I2SR_IIF;
+ return 0;
+ }
+ udelay(10);
+ }
+ printk(KERN_ERR "%s: timeout", __func__);
+ return -ETIMEDOUT;
+}
+
+
+/*
+ * static void i2c_set_addr()
+ *
+ * Sets slave address to communicate
+ */
+static int
+i2c_set_addr(
+ struct i2c_algo_mcf_data *adap,
+ struct i2c_msg *msg,
+ int retries
+) {
+ unsigned short flags = msg->flags;
+ unsigned char addr;
+ MCF_I2CR |= MCF_I2CR_MTX;
+ if ((flags & I2C_M_TEN)) {
+ /* 10 bit address not supported yet */
+ return -EIO;
+ } else {
+ /* normal 7bit address */
+ addr = (msg->addr << 1);
+ if (flags & I2C_M_RD)
+ addr |= 1;
+ if (flags & I2C_M_REV_DIR_ADDR)
+ addr ^= 1;
+
+ MCF_I2DR = addr;
+ }
+ return 0;
+}
+
+
+/*
+ * static void mcf_i2c_init()
+ *
+ * Perform ColdFire i2c initialization
+ */
+static void
+mcf_i2c_init(struct i2c_algo_mcf_data *adap)
+{
+ u8 dummy;
+
+ /* Setup GPIO lines */
+#if defined(CONFIG_M547X_8X)
+ MCF_PAR_FECI2CIRQ |= MCF_PAR_SDA;
+ MCF_PAR_FECI2CIRQ |= MCF_PAR_SCL;
+#elif defined(CONFIG_M5445X)
+ MCF_GPIO_PAR_FECI2C |= (0
+ | MCF_GPIO_PAR_FECI2C_PAR_SDA(3)
+ | MCF_GPIO_PAR_FECI2C_PAR_SCL(3));
+#elif defined(CONFIG_M5441X)
+ MCF_GPIO_PAR_CANI2C =
+ (MCF_GPIO_PAR_CANI2C & MCF_GPIO_PAR_CANI2C_I2C0SCL_MASK) |
+ MCF_GPIO_PAR_CANI2C_I2C0SCL_I2C0SCL;
+ MCF_GPIO_PAR_CANI2C =
+ (MCF_GPIO_PAR_CANI2C & MCF_GPIO_PAR_CANI2C_I2C0SDA_MASK) |
+ MCF_GPIO_PAR_CANI2C_I2C0SDA_I2C0SDA;
+#endif
+
+ /* Ensure slaves are in idle state */
+ if (MCF_I2SR & MCF_I2SR_IBB) {
+#if defined(CONFIG_M547X_8X)
+ MCF_I2ICR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0x0A;
+ dummy = MCF_I2DR;
+ MCF_I2SR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2ICR = 0x01;
+#elif defined(CONFIG_M5445X) || defined(CONFIG_M5441X)
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0xA0;
+ dummy = MCF_I2DR;
+ MCF_I2SR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0x80;
+#endif
+ }
+
+ /* setup SCL clock */
+ MCF_I2FDR = get_clock(adap);
+
+ /* set slave address */
+ MCF_I2AR = get_own(adap);
+
+ /* enable I2C module */
+#if defined(CONFIG_M5441X)
+ MCF_I2CR = (MCF_I2CR_IEN | MCF_I2CR_IIEN);
+#else
+ MCF_I2CR = MCF_I2CR_IEN;
+#endif
+}
+
+static int i2c_outb(
+ struct i2c_adapter *i2c_adap,
+ char c
+) {
+
+ struct i2c_algo_mcf_data *adap = i2c_adap->algo_data;
+ int timeout;
+ /* Put data to be sent */
+ MCF_I2DR = c;
+ /* Wait for xfer completed*/
+ timeout = wait_xfer_done(adap);
+ if (timeout) {
+ i2c_stop(adap);
+ wait_for_bb(adap);
+ printk(KERN_ERR "i2c-algo-mcf: %s i2c_write: "
+ "error - timeout.\n", i2c_adap->name);
+ return -EREMOTEIO; /* got a better one ?? */
+ }
+
+ return 0;
+}
+
+
+/*
+ * static void mcf_sendbytes()
+ *
+ * Perform tx data transfer
+ */
+static int
+mcf_sendbytes(
+ struct i2c_adapter *i2c_adap,
+ const char *buf,
+ int count, int last
+) {
+ struct i2c_algo_mcf_data *adap = i2c_adap->algo_data;
+ int ret, i;
+
+ /* Set master TX mode */
+ MCF_I2CR |= MCF_I2CR_MTX;
+
+ for (i = 0; i < count; ++i) {
+ printk(KERN_DEBUG "i2c-algo-mcf: %s i2c_write: writing %2.2X\n",
+ i2c_adap->name, buf[i]&0xff);
+ ret = i2c_outb(i2c_adap, buf[i]);
+ if (ret < 0)
+ return ret;
+ }
+ if (last) {
+ i2c_stop(adap);
+ wait_for_bb(adap);
+ } else {
+ /* i2c_repstart(adap);*/
+ }
+
+ return i;
+}
+
+
+/*
+ * static void mcf_readbytes()
+ *
+ * Perform rx data transfer
+ */
+static int
+mcf_readbytes(
+ struct i2c_adapter *i2c_adap,
+ char *buf,
+ int count, int last
+) {
+ int i;
+ struct i2c_algo_mcf_data *adap = i2c_adap->algo_data;
+ u8 dummy;
+
+ /* Set master RX mode */
+ MCF_I2CR &= ~MCF_I2CR_MTX;
+ MCF_I2CR &= ~MCF_I2CR_TXAK;
+ dummy = MCF_I2DR;
+
+ for (i = 0; i < count-1; i++) {
+ if (wait_xfer_done(adap)) {
+ i2c_stop(adap);
+ wait_for_bb(adap);
+ printk(KERN_DEBUG
+ "i2c-algo-mcf: mcf_readbytes timed out.\n");
+ return -1;
+ }
+
+ /* store next data byte */
+ buf[i] = MCF_I2DR;
+ }
+
+ if (wait_xfer_done(adap)) {
+ i2c_stop(adap);
+ wait_for_bb(adap);
+ printk(KERN_DEBUG "i2c-algo-mcf: mcf_readbytes timed out.\n");
+ return -1;
+ }
+
+ /* Disable acknowlege (set I2CR.TXAK) */
+ MCF_I2CR |= MCF_I2CR_TXAK;
+ buf[i] = MCF_I2DR;
+ if (wait_xfer_done(adap)) {
+ i2c_stop(adap);
+ wait_for_bb(adap);
+ printk(KERN_DEBUG "i2c-algo-mcf: mcf_readbytes timed out.\n");
+ return -1;
+ }
+
+ if (last) {
+ i2c_stop(adap);
+ wait_for_bb(adap);
+ } else {
+ /* i2c_repstart(adap);*/
+ }
+
+ return i+1;
+}
+
+
+/*
+ * static void mcf_xfer()
+ *
+ * Perform master data I/O transfer
+ */
+static int
+mcf_xfer(
+ struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs,
+ int num)
+{
+ struct i2c_algo_mcf_data *adap = i2c_adap->algo_data;
+ struct i2c_msg *pmsg;
+ int i;
+ int ret = 0, timeout;
+
+ /* Skip own address */
+ if (get_own(adap) == (msgs[0].addr << 1))
+ return -EIO;
+
+ /* Ensure slaves are in idle state */
+ if (MCF_I2SR & MCF_I2SR_IBB) {
+#if defined(CONFIG_M547X_8X)
+ MCF_I2ICR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0x0A;
+ timeout = MCF_I2DR;
+ MCF_I2SR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2ICR = 0x01;
+#elif defined(CONFIG_M5445X) || defined(CONFIG_M5441X)
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0xA0;
+ timeout = MCF_I2DR;
+ MCF_I2SR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0x80;
+#endif
+ }
+
+ /* setup SCL clock */
+ MCF_I2FDR = get_clock(adap);
+ /* set slave address */
+ MCF_I2AR = get_own(adap);
+ /* enable I2C module */
+#if defined(CONFIG_M5441X)
+ MCF_I2CR = (MCF_I2CR_IEN | MCF_I2CR_IIEN);
+#else
+ MCF_I2CR = MCF_I2CR_IEN;
+#endif
+ MCF_I2CR |= MCF_I2CR_TXAK;
+
+ /* Check for bus busy */
+ wait_for_bb(adap);
+
+ for (i = 0; ret >= 0 && i < num; i++) {
+ if (MCF_I2SR & MCF_I2SR_IBB) {
+#if defined(CONFIG_M547X_8X)
+ MCF_I2ICR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0x0A;
+ timeout = MCF_I2DR;
+ MCF_I2SR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2ICR = 0x01;
+#elif defined(CONFIG_M5445X) || defined(CONFIG_M5441X)
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0xA0;
+ timeout = MCF_I2DR;
+ MCF_I2SR = 0x00;
+ MCF_I2CR = 0x00;
+ MCF_I2CR = 0x80;
+#endif
+ }
+ /* setup SCL clock */
+ MCF_I2FDR = get_clock(adap);
+ /* set slave address */
+ MCF_I2AR = get_own(adap);
+ /* enable I2C module */
+#if defined(CONFIG_M5441X)
+ MCF_I2CR = (MCF_I2CR_IEN | MCF_I2CR_IIEN);
+#else
+ MCF_I2CR = MCF_I2CR_IEN;
+#endif
+ MCF_I2CR |= MCF_I2CR_TXAK;
+
+ /* Check for bus busy */
+ wait_for_bb(adap);
+
+ pmsg = &msgs[i];
+
+ printk(KERN_DEBUG "i2c-algo-mcf: Doing %s %d bytes "
+ "to 0x%02x - %d of %d messages\n",
+ pmsg->flags & I2C_M_RD ? "read" : "write",
+ pmsg->len, pmsg->addr, i + 1, num);
+
+ /* Send START */
+ /*if (i == 0)*/
+ i2c_start(adap);
+
+ /* Wait for Bus Busy */
+ wait_for_not_bb(adap);
+
+ MCF_I2CR |= MCF_I2CR_MTX;
+
+ ret = i2c_set_addr(adap, pmsg, i2c_adap->retries);
+ if (ret < 0)
+ return ret;
+
+ /* Wait for address transfer completion */
+ wait_xfer_done(adap);
+
+ /* Check for ACK */
+ if (!i2c_getack(adap)) {
+ i2c_stop(adap);
+ wait_for_bb(adap);
+ printk(KERN_DEBUG "i2c-algo-mcf: No ack after "
+ "send address in mcf_xfer\n");
+ return -EREMOTEIO;
+ }
+
+ printk(KERN_DEBUG "i2c-algo-mcf: Msg %d, "
+ "addr = 0x%x, flags = 0x%x, len = %d\n",
+ i, msgs[i].addr, msgs[i].flags, msgs[i].len);
+ /* Read */
+ if (pmsg->flags & I2C_M_RD) {
+ /* read bytes into buffer*/
+ ret = mcf_readbytes(i2c_adap, pmsg->buf, pmsg->len,
+ (i + 1 == num));
+
+ if (ret != pmsg->len) {
+ printk(KERN_DEBUG "i2c-algo-mcf: fail: "
+ "only read %d bytes.\n", ret);
+ } else {
+ printk(KERN_DEBUG "i2c-algo-mcf: "
+ "read %d bytes.\n", ret);
+ }
+ } else {
+ /* write bytes into buffer*/
+ ret = mcf_sendbytes(i2c_adap, pmsg->buf, pmsg->len,
+ (i + 1 == num));
+ if (ret != pmsg->len) {
+ printk(KERN_DEBUG "i2c-algo-mcf: fail: "
+ "only wrote %d bytes.\n", ret);
+ } else {
+ printk(KERN_DEBUG "i2c-algo-mcf: wrote"
+ "%d bytes.\n", ret);
+ }
+ }
+ MCF_I2CR = 0;
+ }
+
+ /* Disable I2C module */
+ MCF_I2CR = 0;
+ return i;
+}
+
+
+/*
+ * static void mcf_func()
+ *
+ * Return algorithm funtionality
+ */
+static u32
+mcf_func(
+ struct i2c_adapter *i2c_adap
+) {
+ return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_I2C;
+}
+
+/*
+ * ColdFire bus algorithm callbacks
+ */
+static struct i2c_algorithm mcf_algo = {
+ .master_xfer = mcf_xfer,
+ .functionality = mcf_func,
+};
+
+/***********************************************************/
+struct coldfire_i2c {
+ void __iomem *base;
+ struct resource *irqarea;
+ struct resource *ioarea;
+ u32 irq;
+ struct i2c_adapter *adap;
+ u32 flags;
+};
+
+/*
+ * registering functions to load algorithms at runtime
+ */
+int i2c_mcf_add_bus(struct i2c_adapter *adap)
+{
+ struct i2c_algo_mcf_data *mcf_adap = adap->algo_data;
+
+ /*adap->id |= mcf_algo.id;*/
+ adap->algo = &mcf_algo;
+ adap->timeout = 100;
+
+ mcf_i2c_init(mcf_adap);
+
+ i2c_add_numbered_adapter(adap);
+
+ return 0;
+}
+
+static int mcf_i2c_probe(struct platform_device *pdev)
+{
+ struct coldfire_i2c *i2c;
+ int rc = 0;
+
+ /************************************************************/
+ i2c = kzalloc(sizeof(*i2c), GFP_KERNEL);
+ if (!i2c) {
+ printk(KERN_ERR "%s kzalloc coldfire_i2c faile\n",
+ __func__);
+ return -ENOMEM;
+ }
+ /****************************************************************/
+ platform_set_drvdata(pdev, i2c);
+
+ i2c->adap = &i2c_mcf_board_adapter;
+ i2c->adap->dev.parent = &pdev->dev;
+ i2c->adap->nr = pdev->id;
+ rc = i2c_mcf_add_bus(i2c->adap);
+ if (rc < 0) {
+ printk(KERN_ERR "%s - failed to add adapter\n", __func__);
+ rc = -ENODEV;
+ goto fail_add;
+ }
+
+ printk(KERN_INFO "i2c-algo-mcf.o: I2C ColdFire algorithm"
+ " module is loaded.\n");
+ return rc;
+
+fail_add:
+ kfree(i2c);
+ return rc;
+};
+
+static int mcf_i2c_remove(struct platform_device *pdev)
+{
+ struct coldfire_i2c *i2c = platform_get_drvdata(pdev);
+
+ i2c_del_adapter(i2c->adap);
+ platform_set_drvdata(pdev, NULL);
+ iounmap(i2c->base);
+ kfree(i2c);
+ return 0;
+};
+
+/* Structure for a device driver */
+static struct platform_driver mcf_i2c_driver = {
+ .probe = mcf_i2c_probe,
+ .remove = mcf_i2c_remove,
+ .driver = {
+ .owner = THIS_MODULE,
+ .name = "mcf-i2c",
+ },
+};
+
+#ifdef CONFIG_PROC_FS
+
+/*
+ * Info exported via "/proc/driver/i2c".
+ */
+
+static int gen_i2c_proc_output(char *buf)
+{
+ char *p;
+
+ p = buf;
+ p += sprintf(p,
+ "I2CR: 0x%x\n"
+ "I2SR: 0x%x\n"
+ "I2DR: 0x%x\n",
+ MCF_I2CR, MCF_I2SR, MCF_I2DR);
+
+ return p - buf;
+}
+
+static int gen_i2c_read_proc(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ int len = gen_i2c_proc_output(page);
+ if (len <= off+count)
+ *eof = 1;
+ *start = page + off;
+ len -= off;
+ if (len > count)
+ len = count;
+ if (len < 0)
+ len = 0;
+ return len;
+}
+
+static int __init gen_i2c_proc_init(void)
+{
+ struct proc_dir_entry *r;
+
+ r = create_proc_read_entry("driver/i2c-adaptor-register", 0, NULL,
+ gen_i2c_read_proc, NULL);
+ if (!r)
+ return -ENOMEM;
+ return 0;
+}
+#else
+static inline int gen_i2c_proc_init(void) { return 0; }
+#endif /* CONFIG_PROC_FS */
+
+static int __init coldfire_i2c_init(void)
+{
+ int retval;
+
+ retval = gen_i2c_proc_init();
+ if (retval < 0)
+ printk(KERN_INFO "generate /proc/i2c-adaptor-register "
+ "for i2c master mode failed!\n");
+
+ return platform_driver_register(&mcf_i2c_driver);
+}
+
+static void __exit coldfire_i2c_exit(void)
+{
+ platform_driver_unregister(&mcf_i2c_driver);
+}
+
+module_init(coldfire_i2c_init);
+module_exit(coldfire_i2c_exit);
+
+MODULE_AUTHOR("Adrian Cox <adrian@humboldt.co.uk>");
+MODULE_DESCRIPTION("I2C-Bus adapter for MCFV4/MCFV4E processors");
+MODULE_LICENSE("GPL");
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