Below is patch to support I2C controller on NEC EMMA2RH board
Signed-off: dmitry pervushin <dpervushin@xxxxxxxxxxxxx>
drivers/i2c/algos/Kconfig | 5
drivers/i2c/algos/Makefile | 1
drivers/i2c/algos/i2c-algo-emma2rh.c | 426 +++++++++++++++++++++++++++++++++++
drivers/i2c/algos/i2c-algo-emma2rh.h | 105 ++++++++
drivers/i2c/busses/Kconfig | 7
drivers/i2c/busses/Makefile | 1
drivers/i2c/busses/i2c-emma2rh.c | 253 ++++++++++++++++++++
7 files changed, 798 insertions(+)
Index: linux-2.6.20/drivers/i2c/algos/Kconfig
===================================================================
--- linux-2.6.20.orig/drivers/i2c/algos/Kconfig
+++ linux-2.6.20/drivers/i2c/algos/Kconfig
@@ -49,5 +49,10 @@ config I2C_ALGO_SGI
Supports the SGI interfaces like the ones found on SGI Indy VINO
or SGI O2 MACE.
+config I2C_ALGO_EMMA2RH
+ tristate "I2C EMMA2RH interfaces"
+ depends on I2C && MARKEINS
+ help
+ NEC EMMA2RH I2C Algorithm
endmenu
Index: linux-2.6.20/drivers/i2c/algos/Makefile
===================================================================
--- linux-2.6.20.orig/drivers/i2c/algos/Makefile
+++ linux-2.6.20/drivers/i2c/algos/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_I2C_ALGOBIT) += i2c-algo-bi
obj-$(CONFIG_I2C_ALGOPCF) += i2c-algo-pcf.o
obj-$(CONFIG_I2C_ALGOPCA) += i2c-algo-pca.o
obj-$(CONFIG_I2C_ALGO_SGI) += i2c-algo-sgi.o
+obj-$(CONFIG_I2C_ALGO_EMMA2RH) += i2c-algo-emma2rh.o
ifeq ($(CONFIG_I2C_DEBUG_ALGO),y)
EXTRA_CFLAGS += -DDEBUG
Index: linux-2.6.20/drivers/i2c/algos/i2c-algo-emma2rh.c
===================================================================
--- /dev/null
+++ linux-2.6.20/drivers/i2c/algos/i2c-algo-emma2rh.c
@@ -0,0 +1,426 @@
+/*
+ -------------------------------------------------------------------------
+ i2c-algo-emma2rh.c i2c driver algorithms for NEC EMMA2RH I2C adapters
+ -------------------------------------------------------------------------
+
+ Copyright (C) NEC Electronics Corporation 2005-2006
+
+ Changes made to support the I2C peripheral on the NEC EMMA2RH
+
+ -------------------------------------------------------------------------
+ This file was highly leveraged from i2c-algo-pcf.c, which was created
+ by Simon G. Vogl and Hans Berglund:
+
+ Copyright (C) 1995-1997 Simon G. Vogl
+ 1998-2000 Hans Berglund
+
+ With some changes from Kyösti Mälkki <kmalkki@xxxxxxxxx> and
+ Frodo Looijaard <frodol@xxxxxx> ,and also from Martin Bailey
+ <mbailey@xxxxxxxxxxxxxxxxxx>
+
+ Partially rewriten by Oleg I. Vdovikin <vdovikin@xxxxxxx> to handle multiple
+ messages, proper stop/repstart signaling during receive,
+ added detect code
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ -------------------------------------------------------------------------
+*/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/ioport.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-emma2rh.h>
+
+#include <asm/emma2rh/emma2rh.h>
+
+#ifdef DEBUG
+#define i2c_emma2rh_debug(level,op) do { if (i2c_debug>=(level)) { op; } } while (0)
+static int i2c_debug;
+module_param(i2c_debug, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(i2c_debug,
+ "debug level - 0 off; 1 normal; 2,3 more verbose; 9 i2c-protocol");
+#else
+#define i2c_emma2rh_debug(level,op) /* nothing */
+#endif
+
+#define DEB(x) i2c_emma2rh_debug(1, x)
+#define DEB2(x) i2c_emma2rh_debug(2, x)
+#define DEB3(x) i2c_emma2rh_debug(3, x)
+#define DEBPROTO(x) i2c_emma2rh_debug(9,x)
+
+#define EMMA2RH_I2C_RETRIES 3
+#define EMMA2RH_I2C_TIMEOUT 100
+
+/* --- setting states on the bus with the right timing: --------------- */
+#define set_emma(adap, ctl, val) adap->setemma(adap->data, ctl, val)
+#define get_emma(adap, ctl) adap->getemma(adap->data, ctl)
+#define get_own(adap) adap->getown(adap->data)
+#define get_clock(adap) adap->getclock(adap->data)
+
+/* --- other auxiliary functions -------------------------------------- */
+
+static void i2c_start(struct i2c_algo_emma_data *adap)
+{
+ DEBPROTO(printk("S "));
+ set_emma(adap, I2C_EMMA_CNT, I2C_EMMA_START);
+}
+
+static void i2c_repstart(struct i2c_algo_emma_data *adap)
+{
+ DEBPROTO(printk(" Sr "));
+ set_emma(adap, I2C_EMMA_CNT, I2C_EMMA_REPSTART);
+}
+
+static void i2c_stop(struct i2c_algo_emma_data *adap)
+{
+ DEBPROTO(printk("P\n"));
+ set_emma(adap, I2C_EMMA_CNT, I2C_EMMA_STOP);
+}
+
+static inline void emma_sleep(unsigned long timeout)
+{
+ schedule_timeout(timeout * HZ);
+}
+
+static int wait_for_pin(struct i2c_algo_emma_data *adap, int *status)
+{
+ adap->waitforpin(adap->data);
+ *status = get_emma(adap, I2C_EMMA_STA);
+ return 0;
+}
+
+static int emma_init(struct i2c_algo_emma_data *adap)
+{
+ unsigned char temp;
+
+ /* serial interface off */
+ set_emma(adap, I2C_EMMA_CNT, 0);
+
+ /* load clock register CS */
+ set_emma(adap, I2C_EMMA_CSEL, get_clock(adap));
+ udelay(20); /* wait awhile */
+ /* check it's realy written, the only 4 lowest bits does matter */
+ if (((temp = get_emma(adap, I2C_EMMA_CSEL)) & 0x8f) != get_clock(adap)) {
+ DEB2(printk
+ (KERN_ERR
+ "%s: EMMA detection failed -- can't set I2C_EMMA_CSEL (0x%02x).\n",
+ __FUNCTION__, temp));
+ return -ENXIO;
+ }
+
+ /* initialize interrupt mask */
+ set_emma(adap, I2C_EMMA_INT, 0);
+ set_emma(adap, I2C_EMMA_INTM, INTE0);
+
+ /* Enable serial interface */
+ set_emma(adap, I2C_EMMA_CNT, IICE);
+
+ /* generate a STOP condition, first of all */
+ i2c_stop(adap);
+
+ return 0;
+}
+
+static int emma_exit(struct i2c_algo_emma_data *adap)
+{
+ set_emma(adap, I2C_EMMA_INTM, 0);
+}
+
+/* --- Utility functions ---------------------------------------------- */
+
+static inline int try_address(struct i2c_algo_emma_data *adap,
+ unsigned char addr, int retries)
+{
+ int i, status, ret = -1;
+
+ for (i = 0; i < retries; i++) {
+ i2c_start(adap);
+ set_emma(adap, I2C_EMMA_SHR, addr);
+ if (wait_for_pin(adap, &status) >= 0)
+ if (status & ACKD) {
+ i2c_stop(adap);
+ ret = 1;
+ break; /* success! */
+ }
+ i2c_stop(adap);
+ udelay(adap->udelay);
+ }
+ DEB2(if (i)
+ printk(KERN_DEBUG "%s: needed %d retries for %d\n", __FUNCTION__, i, addr)) ;
+ return ret;
+}
+
+static int emma_sendbytes(struct i2c_adapter *i2c_adap, const char *buf,
+ int count, int last)
+{
+ struct i2c_algo_emma_data *adap = i2c_adap->algo_data;
+ int wrcount, status, timeout;
+
+ set_emma(adap, I2C_EMMA_CNT, IICE | WTIM);
+ for (wrcount = 0; wrcount < count; wrcount++) {
+ set_emma(adap, I2C_EMMA_INT, 0);
+ set_emma(adap, I2C_EMMA_SHR, buf[wrcount] & SR);
+ timeout = wait_for_pin(adap, &status);
+ if (timeout) {
+ i2c_stop(adap);
+ printk(KERN_ERR "%s i2c_write: "
+ "error - timeout.\n", i2c_adap->name);
+ return -EREMOTEIO; /* got a better one ?? */
+ }
+ if (!(status & ACKD)) {
+ i2c_stop(adap);
+ printk(KERN_ERR "%s i2c_write: "
+ "error - no ack.\n", i2c_adap->name);
+ return -EREMOTEIO; /* got a better one ?? */
+ }
+ }
+
+ if (last)
+ i2c_stop(adap);
+ else
+ i2c_repstart(adap);
+
+ return (wrcount);
+}
+
+static int emma_readbytes(struct i2c_adapter *i2c_adap, char *buf,
+ int count, int last)
+{
+ struct i2c_algo_emma_data *adap = i2c_adap->algo_data;
+ int rdcount, status, timeout;
+
+ for (rdcount = 0; rdcount < count; rdcount++) {
+
+ /* we will suffer from unexpected interrupts if we
+ * use 8-clock-wait.
+ */
+
+ set_emma(adap, I2C_EMMA_INT, 0);
+ if (rdcount == count - 1)
+ /* last byte */
+ set_emma(adap, I2C_EMMA_CNT, IICE | WREL | WTIM);
+ else
+ set_emma(adap, I2C_EMMA_CNT, IICE | WREL | WTIM | ACKE);
+
+ timeout = wait_for_pin(adap, &status);
+ if (timeout) {
+ i2c_stop(adap);
+ printk(KERN_ERR
+ "i2c-algo-emma.o: emma_readbytes timed out.\n");
+ return (-1);
+ }
+ if (!(status & ACKD) && (rdcount != count - 1)) {
+ i2c_stop(adap);
+ printk(KERN_ERR
+ "i2c-algo-emma.o: i2c_read: i2c_inb, No ack.\n");
+ return (-1);
+ }
+ buf[rdcount] = get_emma(adap, I2C_EMMA_SHR);
+ }
+
+ if (last)
+ i2c_stop(adap);
+ else
+ i2c_repstart(adap);
+
+ return (rdcount);
+}
+
+static inline int emma_doAddress(struct i2c_algo_emma_data *adap,
+ struct i2c_msg *msg, int retries)
+{
+ unsigned short flags = msg->flags;
+ unsigned int addr;
+ int ret;
+
+ set_emma(adap, I2C_EMMA_INT, 0);
+
+ if (flags & I2C_M_TEN) {
+ /* a ten bit address */
+ addr = 0xf0 | ((msg->addr >> 7) & 0x03);
+ DEB2(printk(KERN_DEBUG "addr0: %d\n", addr));
+
+ /* try extended address code... */
+ ret = try_address(adap, addr, retries);
+ if (ret != 1) {
+ printk(KERN_ERR "died at extended address code.\n");
+ return -EREMOTEIO;
+ }
+ /* the remaining 8 bit address */
+ /* ...TBD */
+ printk(KERN_ERR"10 bit addresses are not supported in this driver.\n");
+ return -EREMOTEIO;
+ } else { /* normal 7bit address */
+ addr = (msg->addr << 1);
+ if (flags & I2C_M_RD)
+ addr |= 1;
+ if (flags & I2C_M_REV_DIR_ADDR)
+ addr ^= 1;
+ set_emma(adap, I2C_EMMA_SHR, addr);
+ }
+ return 0;
+}
+
+static int emma_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[], int num)
+{
+ struct i2c_algo_emma_data *adap = i2c_adap->algo_data;
+ struct i2c_msg *pmsg;
+ int i;
+ int ret = 0, timeout, status;
+
+ for (i = 0; ret >= 0 && i < num; i++) {
+ pmsg = &msgs[i];
+
+ DEB2(printk
+ (KERN_DEBUG
+ "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);
+
+ ret = emma_doAddress(adap, pmsg, i2c_adap->retries);
+
+ /* Wait for PIN (pending interrupt NOT) */
+ timeout = wait_for_pin(adap, &status);
+ if (timeout) {
+ i2c_stop(adap);
+ DEB2(printk(KERN_ERR "Timeout waiting "
+ "for PIN(1) in emma_xfer\n"));
+ return (-EREMOTEIO);
+ }
+
+ /* Check LRB (last rcvd bit - slave ack) */
+ if (!(status & ACKD)) {
+ i2c_stop(adap);
+ DEB2(printk
+ (KERN_ERR
+ "No LRB(1) in emma_xfer\n"));
+ return (-EREMOTEIO);
+ }
+
+ DEB3(printk
+ (KERN_DEBUG
+ "i2c-algo-emma.o: Msg %d, addr=0x%x, flags=0x%x, len=%d\n",
+ i, msgs[i].addr, msgs[i].flags, msgs[i].len));
+
+ if (pmsg->flags & I2C_M_RD)
+ /* read bytes into buffer */
+ ret = emma_readbytes(i2c_adap, pmsg->buf, pmsg->len,
+ (i + 1 == num));
+ else /* Write */
+ ret = emma_sendbytes(i2c_adap, pmsg->buf, pmsg->len,
+ (i + 1 == num));
+
+ DEB2( printk( KERN_DEBUG "transferred %d bytes of %d -- %s\n",
+ ret, pmsg->len, ret != pmsg->len ? "FAIL" : "succeeded"));
+ }
+
+ return (i);
+}
+
+static int algo_control(struct i2c_adapter *adapter,
+ unsigned int cmd, unsigned long arg)
+{
+ return 0;
+}
+
+static u32 emma_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_PROTOCOL_MANGLING;
+}
+
+/* --- exported algorithm data ---------------------------------------- */
+
+static struct i2c_algorithm emma_algo = {
+ .master_xfer = emma_xfer,
+ .smbus_xfer = NULL,
+ .algo_control = algo_control, /* ioctl */
+ .functionality = emma_func, /* functionality */
+};
+
+/*
+ * registering functions to load algorithms at routine
+ */
+int i2c_emma_add_bus(struct i2c_adapter *adap)
+{
+ int i;
+ struct i2c_algo_emma_data *emma_adap = adap->algo_data;
+
+ DEB2(printk
+ (KERN_DEBUG "hw routines for %s registered.\n",
+ adap->name));
+
+ /* register new adapter to i2c module... */
+ adap->algo = &emma_algo;
+
+ adap->timeout = EMMA2RH_I2C_TIMEOUT; /* default values, should */
+ adap->retries = EMMA2RH_I2C_RETRIES; /* be replaced by defines */
+
+ if ((i = emma_init(emma_adap)))
+ return i;
+
+ i2c_add_adapter(adap);
+
+ return 0;
+}
+
+int i2c_emma_del_bus(struct i2c_adapter *adap)
+{
+ int res;
+ struct i2c_algo_emma_data *emma_adap = adap->algo_data;
+
+ emma_exit(emma_adap);
+
+ if ((res = i2c_del_adapter(adap)) < 0)
+ return res;
+ DEB2(printk(KERN_DEBUG "adapter unregistered: %s\n",
+ adap->name));
+
+ return 0;
+}
+
+int __init i2c_algo_emma_init(void)
+{
+ return 0;
+}
+
+void i2c_algo_emma_exit(void)
+{
+ return;
+}
+
+EXPORT_SYMBOL_GPL(i2c_emma_add_bus);
+EXPORT_SYMBOL_GPL(i2c_emma_del_bus);
+
+MODULE_AUTHOR("NEC Electronics Corporation <www.necel.com>");
+MODULE_DESCRIPTION("NEC EMMA2RH I2C-Bus algorithm");
+MODULE_LICENSE("GPL");
+
+module_init(i2c_algo_emma_init);
+module_exit(i2c_algo_emma_exit);
Index: linux-2.6.20/drivers/i2c/algos/i2c-algo-emma2rh.h
===================================================================
--- /dev/null
+++ linux-2.6.20/drivers/i2c/algos/i2c-algo-emma2rh.h
@@ -0,0 +1,105 @@
+/* -------------------------------------------------------------------- */
+/* i2c-algo-emma2rh.h: NEC EMMA2RH global defines */
+/* -------------------------------------------------------------------- */
+/*
+ Copyright (C) NEC Electronics Corporation 2005-2006
+
+ 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*/
+/* -------------------------------------------------------------------- */
+
+#ifndef I2C_EMMA2RH_H
+#define I2C_EMMA2RH_H
+
+/*---------------------------------------------------------------------------*/
+/* CNT - Control register (00H R/W) */
+/*---------------------------------------------------------------------------*/
+#define SPT 0x00000001
+#define STT 0x00000002
+#define ACKE 0x00000004
+#define WTIM 0x00000008
+#define SPIE 0x00000010
+#define WREL 0x00000020
+#define LREL 0x00000040
+#define IICE 0x00000080
+#define CNT_RESERVED 0x000000ff /* reserved bit 0 */
+
+#define I2C_EMMA_START (IICE | STT)
+#define I2C_EMMA_STOP (IICE | SPT)
+#define I2C_EMMA_REPSTART I2C_EMMA_START
+
+/*---------------------------------------------------------------------------*/
+/* STA - Status register (10H Read) */
+/*---------------------------------------------------------------------------*/
+#define MSTS 0x00000080
+#define ALD 0x00000040
+#define EXC 0x00000020
+#define COI 0x00000010
+#define TRC 0x00000008
+#define ACKD 0x00000004
+#define STD 0x00000002
+#define SPD 0x00000001
+
+/*---------------------------------------------------------------------------*/
+/* CSEL - Clock select register (20H R/W) */
+/*---------------------------------------------------------------------------*/
+#define FCL 0x00000080
+#define ND50 0x00000040
+#define CLD 0x00000020
+#define DAD 0x00000010
+#define SMC 0x00000008
+#define DFC 0x00000004
+#define CL 0x00000003
+#define CSEL_RESERVED 0x000000ff /* reserved bit 0 */
+
+#define FAST397 0x0000008b
+#define FAST297 0x0000008a
+#define FAST347 0x0000000b
+#define FAST260 0x0000000a
+#define FAST130 0x00000008
+#define STANDARD108 0x00000083
+#define STANDARD83 0x00000082
+#define STANDARD95 0x00000003
+#define STANDARD73 0x00000002
+#define STANDARD36 0x00000001
+#define STANDARD71 0x00000000
+
+/*---------------------------------------------------------------------------*/
+/* SVA - Slave address register (30H R/W) */
+/*---------------------------------------------------------------------------*/
+#define SVA 0x000000fe
+
+/*---------------------------------------------------------------------------*/
+/* SHR - Shift register (40H R/W) */
+/*---------------------------------------------------------------------------*/
+#define SR 0x000000ff
+
+/*---------------------------------------------------------------------------*/
+/* INT - Interrupt register (50H R/W) */
+/* INTM - Interrupt mask register (60H R/W) */
+/*---------------------------------------------------------------------------*/
+#define INTE0 0x00000001
+
+/***********************************************************************
+ * I2C registers
+ ***********************************************************************
+ */
+#define I2C_EMMA_CNT 0x00
+#define I2C_EMMA_STA 0x10
+#define I2C_EMMA_CSEL 0x20
+#define I2C_EMMA_SVA 0x30
+#define I2C_EMMA_SHR 0x40
+#define I2C_EMMA_INT 0x50
+#define I2C_EMMA_INTM 0x60
+#endif /* I2C_EMMA2RH_H */
Index: linux-2.6.20/drivers/i2c/busses/Kconfig
===================================================================
--- linux-2.6.20.orig/drivers/i2c/busses/Kconfig
+++ linux-2.6.20/drivers/i2c/busses/Kconfig
@@ -573,4 +573,11 @@ config I2C_PNX
This driver can also be built as a module. If so, the module
will be called i2c-pnx.
+config I2C_EMMA2RH
+ tristate "EMMA2RH I2C adapter"
+ depends on I2C && MARKEINS
+ select I2C_ALGO_EMMA2RH
+ help
+ Support for NEC EMMA2RH I2C Adapter
+
endmenu
Index: linux-2.6.20/drivers/i2c/busses/Makefile
===================================================================
--- linux-2.6.20.orig/drivers/i2c/busses/Makefile
+++ linux-2.6.20/drivers/i2c/busses/Makefile
@@ -47,6 +47,7 @@ obj-$(CONFIG_I2C_VIAPRO) += i2c-viapro.o
obj-$(CONFIG_I2C_VOODOO3) += i2c-voodoo3.o
obj-$(CONFIG_SCx200_ACB) += scx200_acb.o
obj-$(CONFIG_SCx200_I2C) += scx200_i2c.o
+obj-$(CONFIG_I2C_EMMA2RH) += i2c-emma2rh.o
ifeq ($(CONFIG_I2C_DEBUG_BUS),y)
EXTRA_CFLAGS += -DDEBUG
Index: linux-2.6.20/drivers/i2c/busses/i2c-emma2rh.c
===================================================================
--- /dev/null
+++ linux-2.6.20/drivers/i2c/busses/i2c-emma2rh.c
@@ -0,0 +1,253 @@
+/*
+ -------------------------------------------------------------------------
+ i2c-emma2rh.c i2c-hw access for the I2C peripheral on the NEC EMMA2RH
+ -------------------------------------------------------------------------
+
+ Copyright (C) NEC Electronics Corporation 2005-2006
+
+ Changes made to support the I2C peripheral on the NEC EMMA2RH
+
+ -------------------------------------------------------------------------
+ This file was highly leveraged from i2c-elektor.c, which was created
+ by Simon G. Vogl and Hans Berglund:
+
+ Copyright (C) 1995-97 Simon G. Vogl
+ 1998-99 Hans Berglund
+
+ With some changes from Kyösti Mälkki <kmalkki@xxxxxxxxx> and even
+ Frodo Looijaard <frodol@xxxxxx>
+
+ Partialy rewriten by Oleg I. Vdovikin for mmapped support of
+ for Alpha Processor Inc. UP-2000(+) boards
+
+ 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ -------------------------------------------------------------------------
+*/
+
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/delay.h>
+#include <linux/slab.h>
+#include <linux/version.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/i2c-id.h>
+#include <linux/i2c-algo-emma2rh.h>
+#include <linux/platform_device.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/atomic.h>
+#include <asm/emma2rh/emma2rh.h>
+
+#define I2C_EMMA2RH "emma2rh-iic"
+static int i2c_debug = 0;
+
+/* ----- global defines ----------------------------------------------- */
+#define DEB(x) if (i2c_debug>=1) x
+#define DEB2(x) if (i2c_debug>=2) x
+#define DEB3(x) if (i2c_debug>=3) x
+#define DEBE(x) x /* error messages */
+
+struct i2c_drvdata {
+ struct i2c_algo_emma_data alg;
+ struct i2c_adapter adap;
+ spinlock_t lock;
+ atomic_t pending;
+ u32 base;
+ int irq;
+ int clock;
+ int own;
+ wait_queue_head_t wait;
+};
+
+/* ----- local functions ---------------------------------------------- */
+static void i2c_emma_setbyte(void *data, int ctl, int val)
+{
+ int address = ((struct i2c_drvdata *)data)->base + ctl;
+
+ DEB3(printk
+ (KERN_DEBUG "i2c_emma_setbyte: Write 0x%08x 0x%08x\n", address,
+ val));
+ __raw_writel(val, (void *)address);
+}
+
+static int i2c_emma_getbyte(void *data, int ctl)
+{
+ int address = ((struct i2c_drvdata *)data)->base + ctl;
+ int val = __raw_readl((void *)address);
+
+ DEB3(printk
+ (KERN_DEBUG "i2c_emma_getbyte: Read 0x%08x 0x%08x\n", address,
+ val));
+ return (val);
+}
+
+static int i2c_emma_getown(void *data)
+{
+ return (((struct i2c_drvdata *)data)->own);
+}
+
+static int i2c_emma_getclock(void *data)
+{
+ return (((struct i2c_drvdata *)data)->clock);
+}
+
+
+
+static int i2c_emma_reg(struct i2c_client *client)
+{
+ return 0;
+}
+
+static int i2c_emma_unreg(struct i2c_client *client)
+{
+ return 0;
+}
+
+
+static irqreturn_t i2c_emma_handler(int this_irq, void *dev_id)
+{
+ struct i2c_drvdata *dd = dev_id;
+
+ DEB2(printk("i2c_emma_handler: status = 0x%08x\n",
+ __raw_readl((void *)(dd->base + I2C_EMMA_INT))));
+ /* clear interrupt */
+ __raw_writel(0, (void *)(dd->base + I2C_EMMA_INT));
+
+ atomic_set(&dd->pending, 1);
+ wake_up(&dd->wait);
+ return IRQ_HANDLED;
+}
+
+static void i2c_emma_waitforpin(void *data)
+{
+ int timeout = 2;
+ struct i2c_drvdata *dd = data;
+
+ if (dd->irq >=0) {
+ timeout = wait_event_timeout(dd->wait,
+ atomic_read(&dd->pending),
+ timeout * HZ);
+ atomic_set(&dd->pending,0);
+ } else
+ udelay(100);
+}
+
+static int __devinit i2c_emma_probe(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct i2c_drvdata *dd;
+ int err = 0;
+ struct resource *r;
+
+ dd = kzalloc (sizeof *dd, GFP_KERNEL);
+ if (dd == NULL) {
+ err = -ENOMEM;
+ goto out;
+ }
+ dd->alg.data = dd;
+ dd->alg.setemma = i2c_emma_setbyte;
+ dd->alg.getemma = i2c_emma_getbyte;
+ dd->alg.getown = i2c_emma_getown;
+ dd->alg.getclock = i2c_emma_getclock;
+ dd->alg.waitforpin = i2c_emma_waitforpin;
+ dd->alg.udelay = 80;
+ dd->alg.mdelay = 80;
+ dd->alg.timeout = 200;
+
+ strcpy(dd->adap.name, dev->bus_id);
+ dd->adap.id = 0x00;
+ dd->adap.algo = NULL;
+ dd->adap.algo_data = &dd->alg;
+ dd->adap.client_register = i2c_emma_reg;
+ dd->adap.client_unregister = i2c_emma_unreg;
+
+ spin_lock_init(&dd->lock);
+
+ atomic_set(&dd->pending,0);
+ init_waitqueue_head(&dd->wait);
+
+ dev_set_drvdata(dev, dd);
+
+ r = platform_get_resource(pdev, 0, 0);
+ /* get resource of type '0' with #0 */
+
+ if (!r) {
+ printk("Cannot get resource\n");
+ err = -ENODEV;
+ goto out_free;
+ }
+ dd->base = r->start;
+
+ dd->irq = platform_get_irq(pdev,0);
+ dd->clock = FAST397;
+ dd->own = 0x40 + pdev->id * 4;
+
+ err = request_irq(dd->irq, i2c_emma_handler, 0, dev->bus_id, dd);
+ if (err < 0)
+ goto out_free;
+
+ if ((err = i2c_emma_add_bus(&dd->adap)) < 0)
+ goto out_irq;
+
+ return 0;
+out_irq:
+ free_irq(dd->irq, dev->bus_id);
+out_free:
+ kfree(dd);
+out:
+ return err;
+}
+
+static int __devexit i2c_emma_remove (struct device *dev)
+{
+ struct i2c_drvdata* dd = dev_get_drvdata(dev);
+
+ if (dd) {
+ disable_irq(dd->irq);
+ free_irq(dd->irq, dev->bus_id);
+ i2c_emma_del_bus(&dd->adap);
+ kfree(dd);
+ }
+ return 0;
+}
+
+static struct device_driver i2c_emma_driver = {
+ .bus = &platform_bus_type,
+ .name = I2C_EMMA2RH,
+ .probe = i2c_emma_probe,
+ .remove = i2c_emma_remove,
+};
+
+static int __init i2c_emma_init(void)
+{
+ return driver_register(&i2c_emma_driver);
+}
+
+static void __exit i2c_emma_exit(void)
+{
+ driver_unregister(&i2c_emma_driver);
+}
+
+MODULE_AUTHOR("NEC Electronics Corporation <www.necel.com>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for EMMA2RH I2C bus adapter");
+MODULE_LICENSE("GPL");
+
+module_param(i2c_debug, int, S_IRUGO | S_IWUSR);
+module_init(i2c_emma_init);
+module_exit(i2c_emma_exit);
