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Subject[PATCH]2.5.30 i2c updates 3/4
Hello Linus,
Please apply the following four patches that update
2.5.30 with these I2C changes:
o Support for SMBus 2.0 PEC Packet Error Checking
o New algorithm-i2c-algo-8xxx for MPC8XXX
o New algorithm-i2c-algo-ibm_ocp for IBM PPC 405
o New adapter-i2c-adap-ibm_ocp for IBM PPC 405
o New adapter-i2c-frodo for SA 1110 board
o New adapter-i2c-pcf-epp for PCF8584
o New adapter-i2c-pport for parallel port
o New adapter-i2c-rpx for embeded MPC8XX
o Replace depreciated cli()&sti() with spin_{un}lock_irq()
o Updated documentation
Thanks,
Albert
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-adap-ibm_ocp.c 2002-07-03 21:00:38.000000000 -0400
@@ -0,0 +1,401 @@
+/*
+ -------------------------------------------------------------------------
+ i2c-adap-ibm_ocp.c i2c-hw access for the IIC peripheral on the IBM PPC 405
+ -------------------------------------------------------------------------
+
+ Ian DaSilva, MontaVista Software, Inc.
+ idasilva@mvista.com or source@mvista.com
+
+ Copyright 2000 MontaVista Software Inc.
+
+ Changes made to support the IIC peripheral on the IBM PPC 405
+
+
+ ----------------------------------------------------------------------------
+ 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@cc.hut.fi> and even
+ Frodo Looijaard <frodol@dds.nl>
+
+
+ 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.
+ ----------------------------------------------------------------------------
+
+ History: 01/20/12 - Armin
+ akuster@mvista.com
+ ported up to 2.4.16+
+
+ Version 02/03/25 - Armin
+ converted to ocp format
+ removed commented out or #if 0 code
+
+ TODO: convert to ocp_register
+ add PM hooks
+
+*/
+
+
+#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 <asm/irq.h>
+#include <asm/io.h>
+#include <linux/i2c.h>
+#include "i2c-algo-ibm_ocp.h"
+#include <linux/i2c-id.h>
+#include <asm/ocp.h>
+
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
+
+/*
+ * This next section is configurable, and it is used to set the number
+ * of i2c controllers in the system. The default number of instances is 1,
+ * however, this should be changed to reflect your system's configuration.
+ */
+
+/*
+ * The STB03xxx, with a PPC405 core, has two i2c controllers.
+ */
+//(sizeof(IIC_ADDR)/sizeof(struct iic_regs))
+extern iic_t *IIC_ADDR[];
+static struct iic_ibm iic_ibmocp_adaps[IIC_NUMS][5];
+
+static struct i2c_algo_iic_data *iic_ibmocp_data[IIC_NUMS];
+static struct i2c_adapter *iic_ibmocp_ops[IIC_NUMS];
+
+static int i2c_debug=0;
+static wait_queue_head_t iic_wait[IIC_NUMS];
+static int iic_pending;
+
+
+/* ----- 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 */
+
+/* ----- local functions ---------------------------------------------- */
+
+//
+// Description: Write a byte to IIC hardware
+//
+static void iic_ibmocp_setbyte(void *data, int ctl, int val)
+{
+ // writeb resolves to a write to the specified memory location
+ // plus a call to eieio. eieio ensures that all instructions
+ // preceding it are completed before any further stores are
+ // completed.
+ // Delays at this level (to protect writes) are not needed here.
+ writeb(val, ctl);
+}
+
+
+//
+// Description: Read a byte from IIC hardware
+//
+static int iic_ibmocp_getbyte(void *data, int ctl)
+{
+ int val;
+
+ val = readb(ctl);
+ return (val);
+}
+
+
+//
+// Description: Return our slave address. This is the address
+// put on the I2C bus when another master on the bus wants to address us
+// as a slave
+//
+static int iic_ibmocp_getown(void *data)
+{
+ return(((struct iic_ibm *)(data))->iic_own);
+}
+
+
+//
+// Description: Return the clock rate
+//
+static int iic_ibmocp_getclock(void *data)
+{
+ return(((struct iic_ibm *)(data))->iic_clock);
+}
+
+
+#if 0
+static void iic_ibmocp_sleep(unsigned long timeout)
+{
+ schedule_timeout( timeout * HZ);
+}
+#endif
+
+
+//
+// Description: Put this process to sleep. We will wake up when the
+// IIC controller interrupts.
+//
+static void iic_ibmocp_waitforpin(void *data) {
+
+ int timeout = 2;
+ struct iic_ibm *priv_data = data;
+ spinlock_t driver_lock = SPIN_LOCK_UNLOCKED;
+
+ //
+ // If interrupts are enabled (which they are), then put the process to
+ // sleep. This process will be awakened by two events -- either the
+ // the IIC peripheral interrupts or the timeout expires.
+ //
+ if (priv_data->iic_irq > 0) {
+ spin_lock_irq(&driver_lock);
+ if (iic_pending == 0) {
+ interruptible_sleep_on_timeout(&(iic_wait[priv_data->index]), timeout*HZ );
+ } else
+ iic_pending = 0;
+ spin_unlock_irq(&driver_lock);
+ } else {
+ //
+ // If interrupts are not enabled then delay for a reasonable amount
+ // of time and return. We expect that by time we return to the calling
+ // function that the IIC has finished our requested transaction and
+ // the status bit reflects this.
+ //
+ // udelay is probably not the best choice for this since it is
+ // the equivalent of a busy wait
+ //
+ udelay(100);
+ }
+ //printk("iic_ibmocp_waitforpin: exitting\n");
+}
+
+
+//
+// Description: The registered interrupt handler
+//
+static void iic_ibmocp_handler(int this_irq, void *dev_id, struct pt_regs *regs)
+{
+ int ret;
+ struct iic_regs *iic;
+ struct iic_ibm *priv_data = dev_id;
+ iic = (struct iic_regs *) priv_data->iic_base;
+ iic_pending = 1;
+ DEB2(printk("iic_ibmocp_handler: in interrupt handler\n"));
+ // Read status register
+ ret = readb((int) &(iic->sts));
+ DEB2(printk("iic_ibmocp_handler: status = %x\n", ret));
+ // Clear status register. See IBM PPC 405 reference manual for details
+ writeb(0x0a, (int) &(iic->sts));
+ wake_up_interruptible(&(iic_wait[priv_data->index]));
+}
+
+
+//
+// Description: This function is very hardware dependent. First, we lock
+// the region of memory where out registers exist. Next, we request our
+// interrupt line and register its associated handler. Our IIC peripheral
+// uses interrupt number 2, as specified by the 405 reference manual.
+//
+static int iic_hw_resrc_init(int instance)
+{
+
+ DEB(printk("iic_hw_resrc_init: Physical Base address: 0x%x\n", (u32) IIC_ADDR[instance] ));
+ iic_ibmocp_adaps[instance]->iic_base = (u32)ioremap((unsigned long)IIC_ADDR[instance],PAGE_SIZE);
+
+ DEB(printk("iic_hw_resrc_init: ioremapped base address: 0x%x\n", iic_ibmocp_adaps[instance]->iic_base));
+
+ if (iic_ibmocp_adaps[instance]->iic_irq > 0) {
+
+ if (request_irq(iic_ibmocp_adaps[instance]->iic_irq, iic_ibmocp_handler,
+ 0, "IBM OCP IIC", iic_ibmocp_adaps[instance]) < 0) {
+ printk(KERN_ERR "iic_hw_resrc_init: Request irq%d failed\n",
+ iic_ibmocp_adaps[instance]->iic_irq);
+ iic_ibmocp_adaps[instance]->iic_irq = 0;
+ } else {
+ DEB3(printk("iic_hw_resrc_init: Enabled interrupt\n"));
+ }
+ }
+ return 0;
+}
+
+
+//
+// Description: Release irq and memory
+//
+static void iic_ibmocp_release(void)
+{
+ int i;
+
+ for(i=0; i<IIC_NUMS; i++) {
+ struct iic_ibm *priv_data = (struct iic_ibm *)iic_ibmocp_data[i]->data;
+ if (priv_data->iic_irq > 0) {
+ disable_irq(priv_data->iic_irq);
+ free_irq(priv_data->iic_irq, 0);
+ }
+ kfree(iic_ibmocp_data[i]);
+ kfree(iic_ibmocp_ops[i]);
+ }
+}
+
+
+//
+// Description: Does nothing
+//
+static int iic_ibmocp_reg(struct i2c_client *client)
+{
+ return 0;
+}
+
+
+//
+// Description: Does nothing
+//
+static int iic_ibmocp_unreg(struct i2c_client *client)
+{
+ return 0;
+}
+
+
+//
+// Description: If this compiled as a module, then increment the count
+//
+static void iic_ibmocp_inc_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+ MOD_INC_USE_COUNT;
+#endif
+}
+
+
+//
+// Description: If this is a module, then decrement the count
+//
+static void iic_ibmocp_dec_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+}
+
+//
+// Description: Called when the module is loaded. This function starts the
+// cascade of calls up through the heirarchy of i2c modules (i.e. up to the
+// algorithm layer and into to the core layer)
+//
+static int __init iic_ibmocp_init(void)
+{
+ int i;
+
+ printk(KERN_INFO "iic_ibmocp_init: IBM on-chip iic adapter module\n");
+
+ for(i=0; i<IIC_NUMS; i++) {
+ iic_ibmocp_data[i] = kmalloc(sizeof(struct i2c_algo_iic_data),GFP_KERNEL);
+ if(iic_ibmocp_data[i] == NULL) {
+ return -ENOMEM;
+ }
+ memset(iic_ibmocp_data[i], 0, sizeof(struct i2c_algo_iic_data));
+
+ switch (i) {
+ case 0:
+ iic_ibmocp_adaps[i]->iic_irq = IIC_IRQ(0);
+ break;
+ case 1:
+ iic_ibmocp_adaps[i]->iic_irq = IIC_IRQ(1);
+ break;
+ }
+ iic_ibmocp_adaps[i]->iic_clock = IIC_CLOCK;
+ iic_ibmocp_adaps[i]->iic_own = IIC_OWN;
+ iic_ibmocp_adaps[i]->index = i;
+
+ DEB(printk("irq %x\n", iic_ibmocp_adaps[i]->iic_irq));
+ DEB(printk("clock %x\n", iic_ibmocp_adaps[i]->iic_clock));
+ DEB(printk("own %x\n", iic_ibmocp_adaps[i]->iic_own));
+ DEB(printk("index %x\n", iic_ibmocp_adaps[i]->index));
+
+
+ iic_ibmocp_data[i]->data = (struct iic_regs *)iic_ibmocp_adaps[i];
+ iic_ibmocp_data[i]->setiic = iic_ibmocp_setbyte;
+ iic_ibmocp_data[i]->getiic = iic_ibmocp_getbyte;
+ iic_ibmocp_data[i]->getown = iic_ibmocp_getown;
+ iic_ibmocp_data[i]->getclock = iic_ibmocp_getclock;
+ iic_ibmocp_data[i]->waitforpin = iic_ibmocp_waitforpin;
+ iic_ibmocp_data[i]->udelay = 80;
+ iic_ibmocp_data[i]->mdelay = 80;
+ iic_ibmocp_data[i]->timeout = 100;
+
+ iic_ibmocp_ops[i] = kmalloc(sizeof(struct i2c_adapter), GFP_KERNEL);
+ if(iic_ibmocp_ops[i] == NULL) {
+ return -ENOMEM;
+ }
+ memset(iic_ibmocp_ops[i], 0, sizeof(struct i2c_adapter));
+ strcpy(iic_ibmocp_ops[i]->name, "IBM OCP IIC adapter");
+ iic_ibmocp_ops[i]->id = I2C_HW_OCP;
+ iic_ibmocp_ops[i]->algo = NULL;
+ iic_ibmocp_ops[i]->algo_data = iic_ibmocp_data[i];
+ iic_ibmocp_ops[i]->inc_use = iic_ibmocp_inc_use;
+ iic_ibmocp_ops[i]->dec_use = iic_ibmocp_dec_use;
+ iic_ibmocp_ops[i]->client_register = iic_ibmocp_reg;
+ iic_ibmocp_ops[i]->client_unregister = iic_ibmocp_unreg;
+
+
+ init_waitqueue_head(&(iic_wait[i]));
+ if (iic_hw_resrc_init(i) == 0) {
+ if (i2c_iic_add_bus(iic_ibmocp_ops[i]) < 0)
+ return -ENODEV;
+ } else {
+ return -ENODEV;
+ }
+ DEB(printk(KERN_INFO "iic_ibmocp_init: found device at %#x.\n\n", iic_ibmocp_adaps[i]->iic_base));
+ }
+ return 0;
+}
+
+
+static void iic_ibmocp_exit(void)
+{
+ int i;
+
+ for(i=0; i<IIC_NUMS; i++) {
+ i2c_iic_del_bus(iic_ibmocp_ops[i]);
+ }
+ iic_ibmocp_release();
+}
+
+EXPORT_NO_SYMBOLS;
+
+//
+// If modules is NOT defined when this file is compiled, then the MODULE_*
+// macros will resolve to nothing
+//
+MODULE_AUTHOR("MontaVista Software <www.mvista.com>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for PPC 405 IIC bus adapter");
+MODULE_PARM(base, "i");
+MODULE_PARM(irq, "i");
+MODULE_PARM(clock, "i");
+MODULE_PARM(own, "i");
+MODULE_PARM(i2c_debug,"i");
+
+
+module_init(iic_ibmocp_init);
+module_exit(iic_ibmocp_exit);
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-algo-8xx.c 2002-06-11 22:29:54.000000000 -0400
@@ -0,0 +1,592 @@
+/*
+ * i2c-algo-8xx.c i2x driver algorithms for MPC8XX CPM
+ * Copyright (c) 1999 Dan Malek (dmalek@jlc.net).
+ *
+ 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.
+ *
+ * moved into proper i2c interface; separated out platform specific
+ * parts into i2c-rpx.c
+ * Brad Parker (brad@heeltoe.com)
+ */
+
+// XXX todo
+// timeout sleep?
+
+/* $Id: i2c-algo-8xx.c,v 1.6 2002/06/12 02:29:54 mds Exp $ */
+
+#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 <asm/mpc8xx.h>
+#include <asm/commproc.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-8xx.h>
+
+#define CPM_MAX_READ 513
+
+static wait_queue_head_t iic_wait;
+static ushort r_tbase, r_rbase;
+
+int cpm_scan = 1;
+int cpm_debug = 0;
+
+static void
+cpm_iic_interrupt(void *dev_id, void *regs)
+{
+ volatile i2c8xx_t *i2c = (i2c8xx_t *)dev_id;
+
+ if (cpm_debug > 1)
+ printk("cpm_iic_interrupt(dev_id=%p)\n", dev_id);
+
+ /* Chip errata, clear enable.
+ */
+ i2c->i2c_i2mod = 0;
+
+ /* Clear interrupt.
+ */
+ i2c->i2c_i2cer = 0xff;
+
+ /* Get 'me going again.
+ */
+ wake_up_interruptible(&iic_wait);
+}
+
+static void
+cpm_iic_init(struct i2c_algo_8xx_data *cpm_adap)
+{
+ volatile iic_t *iip = cpm_adap->iip;
+ volatile i2c8xx_t *i2c = cpm_adap->i2c;
+
+ if (cpm_debug) printk("cpm_iic_init() - iip=%p\n",iip);
+
+ /* Initialize the parameter ram.
+ * We need to make sure many things are initialized to zero,
+ * especially in the case of a microcode patch.
+ */
+ iip->iic_rstate = 0;
+ iip->iic_rdp = 0;
+ iip->iic_rbptr = 0;
+ iip->iic_rbc = 0;
+ iip->iic_rxtmp = 0;
+ iip->iic_tstate = 0;
+ iip->iic_tdp = 0;
+ iip->iic_tbptr = 0;
+ iip->iic_tbc = 0;
+ iip->iic_txtmp = 0;
+
+ /* Set up the IIC parameters in the parameter ram.
+ */
+ iip->iic_tbase = r_tbase = cpm_adap->dp_addr;
+ iip->iic_rbase = r_rbase = cpm_adap->dp_addr + sizeof(cbd_t)*2;
+
+ iip->iic_tfcr = SMC_EB;
+ iip->iic_rfcr = SMC_EB;
+
+ /* Set maximum receive size.
+ */
+ iip->iic_mrblr = CPM_MAX_READ;
+
+ /* Initialize Tx/Rx parameters.
+ */
+ if (cpm_adap->reloc == 0) {
+ volatile cpm8xx_t *cp = cpm_adap->cp;
+
+ cp->cp_cpcr =
+ mk_cr_cmd(CPM_CR_CH_I2C, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+ while (cp->cp_cpcr & CPM_CR_FLG);
+ }
+
+ /* Select an arbitrary address. Just make sure it is unique.
+ */
+ i2c->i2c_i2add = 0x34;
+
+ /* Make clock run maximum slow.
+ */
+ i2c->i2c_i2brg = 7;
+
+ /* Disable interrupts.
+ */
+ i2c->i2c_i2cmr = 0;
+ i2c->i2c_i2cer = 0xff;
+
+ init_waitqueue_head(&iic_wait);
+
+ /* Install interrupt handler.
+ */
+ if (cpm_debug) {
+ printk ("%s[%d] Install ISR for IRQ %d\n",
+ __func__,__LINE__, CPMVEC_I2C);
+ }
+ (*cpm_adap->setisr)(CPMVEC_I2C, cpm_iic_interrupt, (void *)i2c);
+}
+
+
+static int
+cpm_iic_shutdown(struct i2c_algo_8xx_data *cpm_adap)
+{
+ volatile i2c8xx_t *i2c = cpm_adap->i2c;
+
+ /* Shut down IIC.
+ */
+ i2c->i2c_i2mod = 0;
+ i2c->i2c_i2cmr = 0;
+ i2c->i2c_i2cer = 0xff;
+
+ return(0);
+}
+
+static void
+cpm_reset_iic_params(volatile iic_t *iip)
+{
+ iip->iic_tbase = r_tbase;
+ iip->iic_rbase = r_rbase;
+
+ iip->iic_tfcr = SMC_EB;
+ iip->iic_rfcr = SMC_EB;
+
+ iip->iic_mrblr = CPM_MAX_READ;
+
+ iip->iic_rstate = 0;
+ iip->iic_rdp = 0;
+ iip->iic_rbptr = r_rbase;
+ iip->iic_rbc = 0;
+ iip->iic_rxtmp = 0;
+ iip->iic_tstate = 0;
+ iip->iic_tdp = 0;
+ iip->iic_tbptr = r_tbase;
+ iip->iic_tbc = 0;
+ iip->iic_txtmp = 0;
+}
+
+#define BD_SC_NAK ((ushort)0x0004) /* NAK - did not respond */
+#define CPM_CR_CLOSE_RXBD ((ushort)0x0007)
+
+static void force_close(struct i2c_algo_8xx_data *cpm)
+{
+ if (cpm->reloc == 0) {
+ volatile cpm8xx_t *cp = cpm->cp;
+
+ if (cpm_debug) printk("force_close()\n");
+ cp->cp_cpcr =
+ mk_cr_cmd(CPM_CR_CH_I2C, CPM_CR_CLOSE_RXBD) |
+ CPM_CR_FLG;
+
+ while (cp->cp_cpcr & CPM_CR_FLG);
+ }
+}
+
+
+/* Read from IIC...
+ * abyte = address byte, with r/w flag already set
+ */
+static int
+cpm_iic_read(struct i2c_algo_8xx_data *cpm, u_char abyte, char *buf, int count)
+{
+ volatile iic_t *iip = cpm->iip;
+ volatile i2c8xx_t *i2c = cpm->i2c;
+ volatile cpm8xx_t *cp = cpm->cp;
+ volatile cbd_t *tbdf, *rbdf;
+ u_char *tb;
+ unsigned long flags;
+
+ if (count >= CPM_MAX_READ)
+ return -EINVAL;
+
+ /* check for and use a microcode relocation patch */
+ if (cpm->reloc) {
+ cpm_reset_iic_params(iip);
+ }
+
+ tbdf = (cbd_t *)&cp->cp_dpmem[iip->iic_tbase];
+ rbdf = (cbd_t *)&cp->cp_dpmem[iip->iic_rbase];
+
+ /* To read, we need an empty buffer of the proper length.
+ * All that is used is the first byte for address, the remainder
+ * is just used for timing (and doesn't really have to exist).
+ */
+ if (cpm->reloc) {
+ cpm_reset_iic_params(iip);
+ }
+ tb = cpm->temp;
+ tb = (u_char *)(((uint)tb + 15) & ~15);
+ tb[0] = abyte; /* Device address byte w/rw flag */
+
+ flush_dcache_range((unsigned long) tb, (unsigned long) (tb+1));
+
+ if (cpm_debug) printk("cpm_iic_read(abyte=0x%x)\n", abyte);
+
+ tbdf->cbd_bufaddr = __pa(tb);
+ tbdf->cbd_datlen = count + 1;
+ tbdf->cbd_sc =
+ BD_SC_READY | BD_SC_INTRPT | BD_SC_LAST |
+ BD_SC_WRAP | BD_IIC_START;
+
+ rbdf->cbd_datlen = 0;
+ rbdf->cbd_bufaddr = __pa(buf);
+ rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
+
+ invalidate_dcache_range((unsigned long) buf, (unsigned long) (buf+count));
+
+ /* Chip bug, set enable here */
+ local_irq_save(flags);
+ i2c->i2c_i2cmr = 0x13; /* Enable some interupts */
+ i2c->i2c_i2cer = 0xff;
+ i2c->i2c_i2mod = 1; /* Enable */
+ i2c->i2c_i2com = 0x81; /* Start master */
+
+ /* Wait for IIC transfer */
+ interruptible_sleep_on(&iic_wait);
+ local_irq_restore(flags);
+ if (signal_pending(current))
+ return -EIO;
+
+ if (cpm_debug) {
+ printk("tx sc %04x, rx sc %04x\n",
+ tbdf->cbd_sc, rbdf->cbd_sc);
+ }
+
+ if (tbdf->cbd_sc & BD_SC_NAK) {
+ printk("IIC read; no ack\n");
+ return 0;
+ }
+
+ if (rbdf->cbd_sc & BD_SC_EMPTY) {
+ printk("IIC read; complete but rbuf empty\n");
+ force_close(cpm);
+ printk("tx sc %04x, rx sc %04x\n",
+ tbdf->cbd_sc, rbdf->cbd_sc);
+ }
+
+ if (cpm_debug) printk("read %d bytes\n", rbdf->cbd_datlen);
+
+ if (rbdf->cbd_datlen < count) {
+ printk("IIC read; short, wanted %d got %d\n",
+ count, rbdf->cbd_datlen);
+ return 0;
+ }
+
+
+ invalidate_dcache_range((unsigned long) buf, (unsigned long) (buf+count));
+
+ return count;
+}
+
+/* Write to IIC...
+ * addr = address byte, with r/w flag already set
+ */
+static int
+cpm_iic_write(struct i2c_algo_8xx_data *cpm, u_char abyte, char *buf,int count)
+{
+ volatile iic_t *iip = cpm->iip;
+ volatile i2c8xx_t *i2c = cpm->i2c;
+ volatile cpm8xx_t *cp = cpm->cp;
+ volatile cbd_t *tbdf;
+ u_char *tb;
+ unsigned long flags;
+
+ /* check for and use a microcode relocation patch */
+ if (cpm->reloc) {
+ cpm_reset_iic_params(iip);
+ }
+ tb = cpm->temp;
+ tb = (u_char *)(((uint)tb + 15) & ~15);
+ *tb = abyte; /* Device address byte w/rw flag */
+
+ flush_dcache_range((unsigned long) tb, (unsigned long) (tb+1));
+ flush_dcache_range((unsigned long) buf, (unsigned long) (buf+count));
+
+ if (cpm_debug) printk("cpm_iic_write(abyte=0x%x)\n", abyte);
+
+ /* set up 2 descriptors */
+ tbdf = (cbd_t *)&cp->cp_dpmem[iip->iic_tbase];
+
+ tbdf[0].cbd_bufaddr = __pa(tb);
+ tbdf[0].cbd_datlen = 1;
+ tbdf[0].cbd_sc = BD_SC_READY | BD_IIC_START;
+
+ tbdf[1].cbd_bufaddr = __pa(buf);
+ tbdf[1].cbd_datlen = count;
+ tbdf[1].cbd_sc = BD_SC_READY | BD_SC_INTRPT | BD_SC_LAST | BD_SC_WRAP;
+
+ /* Chip bug, set enable here */
+ local_irq_save(flags);
+ i2c->i2c_i2cmr = 0x13; /* Enable some interupts */
+ i2c->i2c_i2cer = 0xff;
+ i2c->i2c_i2mod = 1; /* Enable */
+ i2c->i2c_i2com = 0x81; /* Start master */
+
+ /* Wait for IIC transfer */
+ interruptible_sleep_on(&iic_wait);
+ local_irq_restore(flags);
+ if (signal_pending(current))
+ return -EIO;
+
+ if (cpm_debug) {
+ printk("tx0 sc %04x, tx1 sc %04x\n",
+ tbdf[0].cbd_sc, tbdf[1].cbd_sc);
+ }
+
+ if (tbdf->cbd_sc & BD_SC_NAK) {
+ printk("IIC write; no ack\n");
+ return 0;
+ }
+
+ if (tbdf->cbd_sc & BD_SC_READY) {
+ printk("IIC write; complete but tbuf ready\n");
+ return 0;
+ }
+
+ return count;
+}
+
+/* See if an IIC address exists..
+ * addr = 7 bit address, unshifted
+ */
+static int
+cpm_iic_tryaddress(struct i2c_algo_8xx_data *cpm, int addr)
+{
+ volatile iic_t *iip = cpm->iip;
+ volatile i2c8xx_t *i2c = cpm->i2c;
+ volatile cpm8xx_t *cp = cpm->cp;
+ volatile cbd_t *tbdf, *rbdf;
+ u_char *tb;
+ unsigned long flags, len;
+
+ if (cpm_debug > 1)
+ printk("cpm_iic_tryaddress(cpm=%p,addr=%d)\n", cpm, addr);
+
+ /* check for and use a microcode relocation patch */
+ if (cpm->reloc) {
+ cpm_reset_iic_params(iip);
+ }
+
+ if (cpm_debug && addr == 0) {
+ printk("iip %p, dp_addr 0x%x\n", cpm->iip, cpm->dp_addr);
+ printk("iic_tbase %d, r_tbase %d\n", iip->iic_tbase, r_tbase);
+ }
+
+ tbdf = (cbd_t *)&cp->cp_dpmem[iip->iic_tbase];
+ rbdf = (cbd_t *)&cp->cp_dpmem[iip->iic_rbase];
+
+ tb = cpm->temp;
+ tb = (u_char *)(((uint)tb + 15) & ~15);
+
+ /* do a simple read */
+ tb[0] = (addr << 1) | 1; /* device address (+ read) */
+ len = 2;
+
+ flush_dcache_range((unsigned long) tb, (unsigned long) (tb+1));
+
+ tbdf->cbd_bufaddr = __pa(tb);
+ tbdf->cbd_datlen = len;
+ tbdf->cbd_sc =
+ BD_SC_READY | BD_SC_INTRPT | BD_SC_LAST |
+ BD_SC_WRAP | BD_IIC_START;
+
+ rbdf->cbd_datlen = 0;
+ rbdf->cbd_bufaddr = __pa(tb+2);
+ rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
+
+ local_irq_save(flags);
+ i2c->i2c_i2cmr = 0x13; /* Enable some interupts */
+ i2c->i2c_i2cer = 0xff;
+ i2c->i2c_i2mod = 1; /* Enable */
+ i2c->i2c_i2com = 0x81; /* Start master */
+
+ if (cpm_debug > 1) printk("about to sleep\n");
+
+ /* wait for IIC transfer */
+ interruptible_sleep_on(&iic_wait);
+ local_irq_restore(flags);
+ if (signal_pending(current))
+ return -EIO;
+
+ if (cpm_debug > 1) printk("back from sleep\n");
+
+ if (tbdf->cbd_sc & BD_SC_NAK) {
+ if (cpm_debug > 1) printk("IIC try; no ack\n");
+ return 0;
+ }
+
+ if (tbdf->cbd_sc & BD_SC_READY) {
+ printk("IIC try; complete but tbuf ready\n");
+ }
+
+ return 1;
+}
+
+static int cpm_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[],
+ int num)
+{
+ struct i2c_algo_8xx_data *adap = i2c_adap->algo_data;
+ struct i2c_msg *pmsg;
+ int i, ret;
+ u_char addr;
+
+ for (i = 0; i < num; i++) {
+ pmsg = &msgs[i];
+
+ if (cpm_debug)
+ printk("i2c-algo-8xx.o: "
+ "#%d addr=0x%x flags=0x%x len=%d\n",
+ i, pmsg->addr, pmsg->flags, pmsg->len);
+
+ addr = pmsg->addr << 1;
+ if (pmsg->flags & I2C_M_RD )
+ addr |= 1;
+ if (pmsg->flags & I2C_M_REV_DIR_ADDR )
+ addr ^= 1;
+
+ if (!(pmsg->flags & I2C_M_NOSTART)) {
+ }
+ if (pmsg->flags & I2C_M_RD ) {
+ /* read bytes into buffer*/
+ ret = cpm_iic_read(adap, addr, pmsg->buf, pmsg->len);
+ if (cpm_debug)
+ printk("i2c-algo-8xx.o: read %d bytes\n", ret);
+ if (ret < pmsg->len ) {
+ return (ret<0)? ret : -EREMOTEIO;
+ }
+ } else {
+ /* write bytes from buffer */
+ ret = cpm_iic_write(adap, addr, pmsg->buf, pmsg->len);
+ if (cpm_debug)
+ printk("i2c-algo-8xx.o: wrote %d\n", ret);
+ if (ret < pmsg->len ) {
+ return (ret<0) ? ret : -EREMOTEIO;
+ }
+ }
+ }
+ return (num);
+}
+
+static int algo_control(struct i2c_adapter *adapter,
+ unsigned int cmd, unsigned long arg)
+{
+ return 0;
+}
+
+static u32 cpm_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR |
+ I2C_FUNC_PROTOCOL_MANGLING;
+}
+
+/* -----exported algorithm data: ------------------------------------- */
+
+static struct i2c_algorithm cpm_algo = {
+ "MPC8xx CPM algorithm",
+ I2C_ALGO_MPC8XX,
+ cpm_xfer,
+ NULL,
+ NULL, /* slave_xmit */
+ NULL, /* slave_recv */
+ algo_control, /* ioctl */
+ cpm_func, /* functionality */
+};
+
+/*
+ * registering functions to load algorithms at runtime
+ */
+int i2c_8xx_add_bus(struct i2c_adapter *adap)
+{
+ int i;
+ struct i2c_algo_8xx_data *cpm_adap = adap->algo_data;
+
+ if (cpm_debug)
+ printk("i2c-algo-8xx.o: hw routines for %s registered.\n",
+ adap->name);
+
+ /* register new adapter to i2c module... */
+
+ adap->id |= cpm_algo.id;
+ adap->algo = &cpm_algo;
+
+#ifdef MODULE
+ MOD_INC_USE_COUNT;
+#endif
+
+ i2c_add_adapter(adap);
+ cpm_iic_init(cpm_adap);
+
+ /* scan bus */
+ if (cpm_scan) {
+ printk(KERN_INFO " i2c-algo-8xx.o: scanning bus %s...\n",
+ adap->name);
+ for (i = 0; i < 128; i++) {
+ if (cpm_iic_tryaddress(cpm_adap, i)) {
+ printk("(%02x)",i<<1);
+ }
+ }
+ printk("\n");
+ }
+ return 0;
+}
+
+
+int i2c_8xx_del_bus(struct i2c_adapter *adap)
+{
+ int res;
+ struct i2c_algo_8xx_data *cpm_adap = adap->algo_data;
+
+ cpm_iic_shutdown(cpm_adap);
+
+ if ((res = i2c_del_adapter(adap)) < 0)
+ return res;
+
+ printk("i2c-algo-8xx.o: adapter unregistered: %s\n",adap->name);
+
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+ return 0;
+}
+
+EXPORT_SYMBOL(i2c_8xx_add_bus);
+EXPORT_SYMBOL(i2c_8xx_del_bus);
+
+int __init i2c_algo_8xx_init (void)
+{
+ printk("i2c-algo-8xx.o: i2c mpc8xx algorithm module version %s (%s)\n", I2C_VERSION, I2C_DATE);
+ return 0;
+}
+
+
+#ifdef MODULE
+MODULE_AUTHOR("Brad Parker <brad@heeltoe.com>");
+MODULE_DESCRIPTION("I2C-Bus MPC8XX algorithm");
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
+
+int init_module(void)
+{
+ return i2c_algo_8xx_init();
+}
+
+void cleanup_module(void)
+{
+}
+#endif
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/include/linux/i2c-algo-8xx.h 2002-06-11 22:29:54.000000000 -0400
@@ -0,0 +1,43 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-algo-8xx.h i2c driver algorithms for MPX8XX CPM */
+/*
+ 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. */
+/* ------------------------------------------------------------------------- */
+
+/* $Id: i2c-algo-8xx.h,v 1.3 2002/06/12 02:29:54 mds Exp $ */
+
+#ifndef I2C_ALGO_8XX_H
+#define I2C_ALGO_8XX_H 1
+
+#include <linux/i2c.h>
+
+struct i2c_algo_8xx_data {
+ uint dp_addr;
+ int reloc;
+ volatile i2c8xx_t *i2c;
+ volatile iic_t *iip;
+ volatile cpm8xx_t *cp;
+
+ int (*setisr) (int irq,
+ void (*func)(void *, void *),
+ void *data);
+
+ u_char temp[513];
+};
+
+int i2c_8xx_add_bus(struct i2c_adapter *);
+int i2c_8xx_del_bus(struct i2c_adapter *);
+
+#endif /* I2C_ALGO_8XX_H */
--- linux-2.5.26/drivers/i2c/i2c-algo-bit.c.orig 2002-07-05 19:42:28.000000000 -0400
+++ linux/drivers/i2c/i2c-algo-bit.c 2002-07-07 20:41:49.000000000 -0400
@@ -21,7 +21,7 @@
/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
Frodo Looijaard <frodol@dds.nl> */

-/* $Id: i2c-algo-bit.c,v 1.34 2001/11/19 18:45:02 mds Exp $ */
+/* $Id: i2c-algo-bit.c,v 1.37 2002/07/08 00:41:49 mds Exp $ */

#include <linux/kernel.h>
#include <linux/module.h>
@@ -143,7 +148,7 @@
/* scl, sda may not be high */
DEBPROTO(printk(" Sr "));
setsda(adap,1);
- setscl(adap,1);
+ sclhi(adap);
udelay(adap->udelay);

sdalo(adap);
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-algo-ibm_ocp.c 2002-07-03 21:00:38.000000000 -0400
@@ -0,0 +1,966 @@
+/*
+ -------------------------------------------------------------------------
+ i2c-algo-ibm_ocp.c i2c driver algorithms for IBM PPC 405 adapters
+ -------------------------------------------------------------------------
+
+ Ian DaSilva, MontaVista Software, Inc.
+ idasilva@mvista.com or source@mvista.com
+
+ Copyright 2000 MontaVista Software Inc.
+
+ Changes made to support the IIC peripheral on the IBM PPC 405
+
+
+ ---------------------------------------------------------------------------
+ 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@cc.hut.fi> and
+ Frodo Looijaard <frodol@dds.nl> ,and also from Martin Bailey
+ <mbailey@littlefeet-inc.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.
+
+ 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.
+ ---------------------------------------------------------------------------
+
+ History: 01/20/12 - Armin
+ akuster@mvista.com
+ ported up to 2.4.16+
+
+ Version 02/03/25 - Armin
+ converted to ocp format
+ removed commented out or #if 0 code
+ added Gérard Basler's fix to iic_combined_transaction() such that it
+ returns the number of successfully completed transfers .
+*/
+
+
+#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/i2c.h>
+#include "i2c-algo-ibm_ocp.h"
+//ACC#include <asm/ocp.h>
+
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
+
+
+/* ----- 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 /* print several statistical values*/
+#define DEBPROTO(x) if (i2c_debug>=9) x;
+ /* debug the protocol by showing transferred bits */
+#define DEF_TIMEOUT 5
+
+/* debugging - slow down transfer to have a look at the data .. */
+/* I use this with two leds&resistors, each one connected to sda,scl */
+/* respectively. This makes sure that the algorithm works. Some chips */
+/* might not like this, as they have an internal timeout of some mils */
+/*
+#define SLO_IO jif=jiffies;while(jiffies<=jif+i2c_table[minor].veryslow)\
+ if (need_resched) schedule();
+*/
+
+
+/* ----- global variables --------------------------------------------- */
+
+#ifdef SLO_IO
+ int jif;
+#endif
+
+/* module parameters:
+ */
+static int i2c_debug=0;
+static int iic_scan=0; /* have a look at what's hanging 'round */
+
+/* --- setting states on the bus with the right timing: --------------- */
+
+#define iic_outb(adap, reg, val) adap->setiic(adap->data, (int) &(reg), val)
+#define iic_inb(adap, reg) adap->getiic(adap->data, (int) &(reg))
+
+#define IICO_I2C_SDAHIGH 0x0780
+#define IICO_I2C_SDALOW 0x0781
+#define IICO_I2C_SCLHIGH 0x0782
+#define IICO_I2C_SCLLOW 0x0783
+#define IICO_I2C_LINEREAD 0x0784
+
+#define IIC_SINGLE_XFER 0
+#define IIC_COMBINED_XFER 1
+
+#define IIC_ERR_LOST_ARB -2
+#define IIC_ERR_INCOMPLETE_XFR -3
+#define IIC_ERR_NACK -1
+
+/* --- other auxiliary functions -------------------------------------- */
+
+
+//
+// Description: Puts this process to sleep for a period equal to timeout
+//
+static inline void iic_sleep(unsigned long timeout)
+{
+ schedule_timeout( timeout * HZ);
+}
+
+
+//
+// Description: This performs the IBM PPC 405 IIC initialization sequence
+// as described in the PPC405GP data book.
+//
+static int iic_init (struct i2c_algo_iic_data *adap)
+{
+ struct iic_regs *iic;
+ struct iic_ibm *adap_priv_data = adap->data;
+ unsigned short retval;
+ iic = (struct iic_regs *) adap_priv_data->iic_base;
+
+ /* Clear master low master address */
+ iic_outb(adap,iic->lmadr, 0);
+
+ /* Clear high master address */
+ iic_outb(adap,iic->hmadr, 0);
+
+ /* Clear low slave address */
+ iic_outb(adap,iic->lsadr, 0);
+
+ /* Clear high slave address */
+ iic_outb(adap,iic->hsadr, 0);
+
+ /* Clear status */
+ iic_outb(adap,iic->sts, 0x0a);
+
+ /* Clear extended status */
+ iic_outb(adap,iic->extsts, 0x8f);
+
+ /* Set clock division */
+ iic_outb(adap,iic->clkdiv, 0x04);
+
+ retval = iic_inb(adap, iic->clkdiv);
+ DEB(printk("iic_init: CLKDIV register = %x\n", retval));
+
+ /* Enable interrupts on Requested Master Transfer Complete */
+ iic_outb(adap,iic->intmsk, 0x01);
+
+ /* Clear transfer count */
+ iic_outb(adap,iic->xfrcnt, 0x0);
+
+ /* Clear extended control and status */
+ iic_outb(adap,iic->xtcntlss, 0xf0);
+
+ /* Set mode control (flush master data buf, enable hold SCL, exit */
+ /* unknown state. */
+ iic_outb(adap,iic->mdcntl, 0x47);
+
+ /* Clear control register */
+ iic_outb(adap,iic->cntl, 0x0);
+
+ DEB2(printk(KERN_DEBUG "iic_init: Initialized IIC on PPC 405\n"));
+ return 0;
+}
+
+
+//
+// Description: After we issue a transaction on the IIC bus, this function
+// is called. It puts this process to sleep until we get an interrupt from
+// from the controller telling us that the transaction we requested in complete.
+//
+static int wait_for_pin(struct i2c_algo_iic_data *adap, int *status)
+{
+
+ int timeout = DEF_TIMEOUT;
+ int retval;
+ struct iic_regs *iic;
+ struct iic_ibm *adap_priv_data = adap->data;
+ iic = (struct iic_regs *) adap_priv_data->iic_base;
+
+
+ *status = iic_inb(adap, iic->sts);
+#ifndef STUB_I2C
+
+ while (timeout-- && (*status & 0x01)) {
+ adap->waitforpin(adap->data);
+ *status = iic_inb(adap, iic->sts);
+ }
+#endif
+ if (timeout <= 0) {
+ /* Issue stop signal on the bus, and force an interrupt */
+ retval = iic_inb(adap, iic->cntl);
+ iic_outb(adap, iic->cntl, retval | 0x80);
+ /* Clear status register */
+ iic_outb(adap, iic->sts, 0x0a);
+ /* Exit unknown bus state */
+ retval = iic_inb(adap, iic->mdcntl);
+ iic_outb(adap, iic->mdcntl, (retval | 0x02));
+
+ // Check the status of the controller. Does it still see a
+ // pending transfer, even though we've tried to stop any
+ // ongoing transaction?
+ retval = iic_inb(adap, iic->sts);
+ retval = retval & 0x01;
+ if(retval) {
+ // The iic controller is hosed. It is not responding to any
+ // of our commands. We have already tried to force it into
+ // a known state, but it has not worked. Our only choice now
+ // is a soft reset, which will clear all registers, and force
+ // us to re-initialize the controller.
+ /* Soft reset */
+ iic_outb(adap, iic->xtcntlss, 0x01);
+ udelay(500);
+ iic_init(adap);
+ /* Is the pending transfer bit in the sts reg finally cleared? */
+ retval = iic_inb(adap, iic->sts);
+ retval = retval & 0x01;
+ if(retval) {
+ printk(KERN_CRIT "The IIC Controller is hosed. A processor reset is required\n");
+ }
+ // For some reason, even though the interrupt bit in this
+ // register was set during iic_init, it didn't take. We
+ // need to set it again. Don't ask me why....this is just what
+ // I saw when testing timeouts.
+ iic_outb(adap, iic->intmsk, 0x01);
+ }
+ return(-1);
+ }
+ else
+ return(0);
+}
+
+
+//------------------------------------
+// Utility functions
+//
+
+
+//
+// Description: Look at the status register to see if there was an error
+// in the requested transaction. If there is, look at the extended status
+// register and determine the exact cause.
+//
+int analyze_status(struct i2c_algo_iic_data *adap, int *error_code)
+{
+ int ret;
+ struct iic_regs *iic;
+ struct iic_ibm *adap_priv_data = adap->data;
+ iic = (struct iic_regs *) adap_priv_data->iic_base;
+
+
+ ret = iic_inb(adap, iic->sts);
+ if(ret & 0x04) {
+ // Error occurred
+ ret = iic_inb(adap, iic->extsts);
+ if(ret & 0x04) {
+ // Lost arbitration
+ *error_code = IIC_ERR_LOST_ARB;
+ }
+ if(ret & 0x02) {
+ // Incomplete transfer
+ *error_code = IIC_ERR_INCOMPLETE_XFR;
+ }
+ if(ret & 0x01) {
+ // Master transfer aborted by a NACK during the transfer of the
+ // address byte
+ *error_code = IIC_ERR_NACK;
+ }
+ return -1;
+ }
+ return 0;
+}
+
+
+//
+// Description: This function is called by the upper layers to do the
+// grunt work for a master send transaction
+//
+static int iic_sendbytes(struct i2c_adapter *i2c_adap,const char *buf,
+ int count, int xfer_flag)
+{
+ struct iic_regs *iic;
+ struct i2c_algo_iic_data *adap = i2c_adap->algo_data;
+ struct iic_ibm *adap_priv_data = adap->data;
+ int wrcount, status, timeout;
+ int loops, remainder, i, j;
+ int ret, error_code;
+ iic = (struct iic_regs *) adap_priv_data->iic_base;
+
+
+ if( count == 0 ) return 0;
+ wrcount = 0;
+ loops = count / 4;
+ remainder = count % 4;
+
+ if((loops > 1) && (remainder == 0)) {
+ for(i=0; i<(loops-1); i++) {
+ //
+ // Write four bytes to master data buffer
+ //
+ for(j=0; j<4; j++) {
+ iic_outb(adap, iic->mdbuf,
+ buf[wrcount++]);
+ }
+ //
+ // Issue command to IICO device to begin transmission
+ //
+ iic_outb(adap, iic->cntl, 0x35);
+ //
+ // Wait for transmission to complete. When it does,
+ //loop to the top of the for statement and write the
+ // next four bytes.
+ //
+ timeout = wait_for_pin(adap, &status);
+ if(timeout < 0) {
+ //
+ // Error handling
+ //
+ //printk(KERN_ERR "Error: write timeout\n");
+ return wrcount;
+ }
+ ret = analyze_status(adap, &error_code);
+ if(ret < 0) {
+ if(error_code == IIC_ERR_INCOMPLETE_XFR) {
+ // Return the number of bytes transferred
+ ret = iic_inb(adap, iic->xfrcnt);
+ ret = ret & 0x07;
+ return (wrcount-4+ret);
+ }
+ else return error_code;
+ }
+ }
+ }
+ else if((loops >= 1) && (remainder > 0)){
+ //printk(KERN_DEBUG "iic_sendbytes: (loops >= 1)\n");
+ for(i=0; i<loops; i++) {
+ //
+ // Write four bytes to master data buffer
+ //
+ for(j=0; j<4; j++) {
+ iic_outb(adap, iic->mdbuf,
+ buf[wrcount++]);
+ }
+ //
+ // Issue command to IICO device to begin transmission
+ //
+ iic_outb(adap, iic->cntl, 0x35);
+ //
+ // Wait for transmission to complete. When it does,
+ //loop to the top of the for statement and write the
+ // next four bytes.
+ //
+ timeout = wait_for_pin(adap, &status);
+ if(timeout < 0) {
+ //
+ // Error handling
+ //
+ //printk(KERN_ERR "Error: write timeout\n");
+ return wrcount;
+ }
+ ret = analyze_status(adap, &error_code);
+ if(ret < 0) {
+ if(error_code == IIC_ERR_INCOMPLETE_XFR) {
+ // Return the number of bytes transferred
+ ret = iic_inb(adap, iic->xfrcnt);
+ ret = ret & 0x07;
+ return (wrcount-4+ret);
+ }
+ else return error_code;
+ }
+ }
+ }
+
+ //printk(KERN_DEBUG "iic_sendbytes: expedite write\n");
+ if(remainder == 0) remainder = 4;
+ // remainder = remainder - 1;
+ //
+ // Write the remaining bytes (less than or equal to 4)
+ //
+ for(i=0; i<remainder; i++) {
+ iic_outb(adap, iic->mdbuf, buf[wrcount++]);
+ //printk(KERN_DEBUG "iic_sendbytes: data transferred = %x, wrcount = %d\n", buf[wrcount-1], (wrcount-1));
+ }
+ //printk(KERN_DEBUG "iic_sendbytes: Issuing write\n");
+
+ if(xfer_flag == IIC_COMBINED_XFER) {
+ iic_outb(adap, iic->cntl, (0x09 | ((remainder-1) << 4)));
+ }
+ else {
+ iic_outb(adap, iic->cntl, (0x01 | ((remainder-1) << 4)));
+ }
+ DEB2(printk(KERN_DEBUG "iic_sendbytes: Waiting for interrupt\n"));
+ timeout = wait_for_pin(adap, &status);
+ if(timeout < 0) {
+ //
+ // Error handling
+ //
+ //printk(KERN_ERR "Error: write timeout\n");
+ return wrcount;
+ }
+ ret = analyze_status(adap, &error_code);
+ if(ret < 0) {
+ if(error_code == IIC_ERR_INCOMPLETE_XFR) {
+ // Return the number of bytes transferred
+ ret = iic_inb(adap, iic->xfrcnt);
+ ret = ret & 0x07;
+ return (wrcount-4+ret);
+ }
+ else return error_code;
+ }
+ DEB2(printk(KERN_DEBUG "iic_sendbytes: Got interrupt\n"));
+ return wrcount;
+}
+
+
+//
+// Description: Called by the upper layers to do the grunt work for
+// a master read transaction.
+//
+static int iic_readbytes(struct i2c_adapter *i2c_adap, char *buf, int count, int xfer_type)
+{
+ struct iic_regs *iic;
+ int rdcount=0, i, status, timeout;
+ struct i2c_algo_iic_data *adap = i2c_adap->algo_data;
+ struct iic_ibm *adap_priv_data = adap->data;
+ int loops, remainder, j;
+ int ret, error_code;
+ iic = (struct iic_regs *) adap_priv_data->iic_base;
+
+ if(count == 0) return 0;
+ loops = count / 4;
+ remainder = count % 4;
+
+ //printk(KERN_DEBUG "iic_readbytes: loops = %d, remainder = %d\n", loops, remainder);
+
+ if((loops > 1) && (remainder == 0)) {
+ //printk(KERN_DEBUG "iic_readbytes: (loops > 1) && (remainder == 0)\n");
+ for(i=0; i<(loops-1); i++) {
+ //
+ // Issue command to begin master read (4 bytes maximum)
+ //
+ //printk(KERN_DEBUG "--->Issued read command\n");
+ iic_outb(adap, iic->cntl, 0x37);
+ //
+ // Wait for transmission to complete. When it does,
+ // loop to the top of the for statement and write the
+ // next four bytes.
+ //
+ //printk(KERN_DEBUG "--->Waiting for interrupt\n");
+ timeout = wait_for_pin(adap, &status);
+ if(timeout < 0) {
+ // Error Handler
+ //printk(KERN_ERR "Error: read timed out\n");
+ return rdcount;
+ }
+ //printk(KERN_DEBUG "--->Got interrupt\n");
+
+ ret = analyze_status(adap, &error_code);
+ if(ret < 0) {
+ if(error_code == IIC_ERR_INCOMPLETE_XFR)
+ return rdcount;
+ else
+ return error_code;
+ }
+
+ for(j=0; j<4; j++) {
+ // Wait for data to shuffle to top of data buffer
+ // This value needs to optimized.
+ udelay(1);
+ buf[rdcount] = iic_inb(adap, iic->mdbuf);
+ rdcount++;
+ //printk(KERN_DEBUG "--->Read one byte\n");
+ }
+ }
+ }
+
+ else if((loops >= 1) && (remainder > 0)){
+ //printk(KERN_DEBUG "iic_readbytes: (loops >=1) && (remainder > 0)\n");
+ for(i=0; i<loops; i++) {
+ //
+ // Issue command to begin master read (4 bytes maximum)
+ //
+ //printk(KERN_DEBUG "--->Issued read command\n");
+ iic_outb(adap, iic->cntl, 0x37);
+ //
+ // Wait for transmission to complete. When it does,
+ // loop to the top of the for statement and write the
+ // next four bytes.
+ //
+ //printk(KERN_DEBUG "--->Waiting for interrupt\n");
+ timeout = wait_for_pin(adap, &status);
+ if(timeout < 0) {
+ // Error Handler
+ //printk(KERN_ERR "Error: read timed out\n");
+ return rdcount;
+ }
+ //printk(KERN_DEBUG "--->Got interrupt\n");
+
+ ret = analyze_status(adap, &error_code);
+ if(ret < 0) {
+ if(error_code == IIC_ERR_INCOMPLETE_XFR)
+ return rdcount;
+ else
+ return error_code;
+ }
+
+ for(j=0; j<4; j++) {
+ // Wait for data to shuffle to top of data buffer
+ // This value needs to optimized.
+ udelay(1);
+ buf[rdcount] = iic_inb(adap, iic->mdbuf);
+ rdcount++;
+ //printk(KERN_DEBUG "--->Read one byte\n");
+ }
+ }
+ }
+
+ //printk(KERN_DEBUG "iic_readbytes: expedite read\n");
+ if(remainder == 0) remainder = 4;
+ DEB2(printk(KERN_DEBUG "iic_readbytes: writing %x to IICO_CNTL\n", (0x03 | ((remainder-1) << 4))));
+
+ if(xfer_type == IIC_COMBINED_XFER) {
+ iic_outb(adap, iic->cntl, (0x0b | ((remainder-1) << 4)));
+ }
+ else {
+ iic_outb(adap, iic->cntl, (0x03 | ((remainder-1) << 4)));
+ }
+ DEB2(printk(KERN_DEBUG "iic_readbytes: Wait for pin\n"));
+ timeout = wait_for_pin(adap, &status);
+ DEB2(printk(KERN_DEBUG "iic_readbytes: Got the interrupt\n"));
+ if(timeout < 0) {
+ // Error Handler
+ //printk(KERN_ERR "Error: read timed out\n");
+ return rdcount;
+ }
+
+ ret = analyze_status(adap, &error_code);
+ if(ret < 0) {
+ if(error_code == IIC_ERR_INCOMPLETE_XFR)
+ return rdcount;
+ else
+ return error_code;
+ }
+
+ //printk(KERN_DEBUG "iic_readbyte: Begin reading data buffer\n");
+ for(i=0; i<remainder; i++) {
+ buf[rdcount] = iic_inb(adap, iic->mdbuf);
+ // printk(KERN_DEBUG "iic_readbytes: Character read = %x\n", buf[rdcount]);
+ rdcount++;
+ }
+
+ return rdcount;
+}
+
+
+//
+// Description: This function implements combined transactions. Combined
+// transactions consist of combinations of reading and writing blocks of data.
+// Each transfer (i.e. a read or a write) is separated by a repeated start
+// condition.
+//
+static int iic_combined_transaction(struct i2c_adapter *i2c_adap, struct i2c_msg msgs[], int num)
+{
+ int i;
+ struct i2c_msg *pmsg;
+ int ret;
+
+ DEB2(printk(KERN_DEBUG "Beginning combined transaction\n"));
+ for(i=0; i < num; i++) {
+ pmsg = &msgs[i];
+ if(pmsg->flags & I2C_M_RD) {
+
+ // Last read or write segment needs to be terminated with a stop
+ if(i < num-1) {
+ DEB2(printk(KERN_DEBUG "This one is a read\n"));
+ }
+ else {
+ DEB2(printk(KERN_DEBUG "Doing the last read\n"));
+ }
+ ret = iic_readbytes(i2c_adap, pmsg->buf, pmsg->len, (i < num-1) ? IIC_COMBINED_XFER : IIC_SINGLE_XFER);
+
+ if (ret != pmsg->len) {
+ DEB2(printk("i2c-algo-ppc405.o: fail: "
+ "only read %d bytes.\n",ret));
+ return i;
+ }
+ else {
+ DEB2(printk("i2c-algo-ppc405.o: read %d bytes.\n",ret));
+ }
+ }
+ else if(!(pmsg->flags & I2C_M_RD)) {
+
+ // Last read or write segment needs to be terminated with a stop
+ if(i < num-1) {
+ DEB2(printk(KERN_DEBUG "This one is a write\n"));
+ }
+ else {
+ DEB2(printk(KERN_DEBUG "Doing the last write\n"));
+ }
+ ret = iic_sendbytes(i2c_adap, pmsg->buf, pmsg->len, (i < num-1) ? IIC_COMBINED_XFER : IIC_SINGLE_XFER);
+
+ if (ret != pmsg->len) {
+ DEB2(printk("i2c-algo-ppc405.o: fail: "
+ "only wrote %d bytes.\n",ret));
+ return i;
+ }
+ else {
+ DEB2(printk("i2c-algo-ppc405.o: wrote %d bytes.\n",ret));
+ }
+ }
+ }
+
+ return num;
+}
+
+
+//
+// Description: Whenever we initiate a transaction, the first byte clocked
+// onto the bus after the start condition is the address (7 bit) of the
+// device we want to talk to. This function manipulates the address specified
+// so that it makes sense to the hardware when written to the IIC peripheral.
+//
+// Note: 10 bit addresses are not supported in this driver, although they are
+// supported by the hardware. This functionality needs to be implemented.
+//
+static inline int iic_doAddress(struct i2c_algo_iic_data *adap,
+ struct i2c_msg *msg, int retries)
+{
+ struct iic_regs *iic;
+ unsigned short flags = msg->flags;
+ unsigned char addr;
+ struct iic_ibm *adap_priv_data = adap->data;
+ iic = (struct iic_regs *) adap_priv_data->iic_base;
+
+//
+// The following segment for 10 bit addresses needs to be ported
+//
+/* Ten bit addresses not supported right now
+ 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 "iic_doAddress: died at extended address code.\n");
+ return -EREMOTEIO;
+ }
+ // the remaining 8 bit address
+ iic_outb(adap,msg->addr & 0x7f);
+ // Status check comes here
+ if (ret != 1) {
+ printk(KERN_ERR "iic_doAddress: died at 2nd address code.\n");
+ return -EREMOTEIO;
+ }
+ if ( flags & I2C_M_RD ) {
+ i2c_repstart(adap);
+ // okay, now switch into reading mode
+ addr |= 0x01;
+ ret = try_address(adap, addr, retries);
+ if (ret!=1) {
+ printk(KERN_ERR "iic_doAddress: died at extended address code.\n");
+ return -EREMOTEIO;
+ }
+ }
+ } else ----------> // normal 7 bit address
+
+Ten bit addresses not supported yet */
+
+ addr = ( msg->addr << 1 );
+ if (flags & I2C_M_RD )
+ addr |= 1;
+ if (flags & I2C_M_REV_DIR_ADDR )
+ addr ^= 1;
+ //
+ // Write to the low slave address
+ //
+ iic_outb(adap, iic->lmadr, addr);
+ //
+ // Write zero to the high slave register since we are
+ // only using 7 bit addresses
+ //
+ iic_outb(adap, iic->hmadr, 0);
+
+ return 0;
+}
+
+
+//
+// Description: Prepares the controller for a transaction (clearing status
+// registers, data buffers, etc), and then calls either iic_readbytes or
+// iic_sendbytes to do the actual transaction.
+//
+static int iic_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg msgs[],
+ int num)
+{
+ struct iic_regs *iic;
+ struct i2c_algo_iic_data *adap = i2c_adap->algo_data;
+ struct iic_ibm *adap_priv_data = adap->data;
+ struct i2c_msg *pmsg;
+ int i = 0;
+ int ret;
+ iic = (struct iic_regs *) adap_priv_data->iic_base;
+
+ pmsg = &msgs[i];
+
+ //
+ // Clear status register
+ //
+ DEB2(printk(KERN_DEBUG "iic_xfer: iic_xfer: Clearing status register\n"));
+ iic_outb(adap, iic->sts, 0x0a);
+
+ //
+ // Wait for any pending transfers to complete
+ //
+ DEB2(printk(KERN_DEBUG "iic_xfer: Waiting for any pending transfers to complete\n"));
+ while((ret = iic_inb(adap, iic->sts)) == 0x01) {
+ ;
+ }
+
+ //
+ // Flush master data buf
+ //
+ DEB2(printk(KERN_DEBUG "iic_xfer: Clearing master data buffer\n"));
+ ret = iic_inb(adap, iic->mdcntl);
+ iic_outb(adap, iic->mdcntl, ret | 0x40);
+
+ //
+ // Load slave address
+ //
+ DEB2(printk(KERN_DEBUG "iic_xfer: Loading slave address\n"));
+ ret = iic_doAddress(adap, pmsg, i2c_adap->retries);
+
+ //
+ // Check to see if the bus is busy
+ //
+ ret = iic_inb(adap, iic->extsts);
+ // Mask off the irrelevent bits
+ ret = ret & 0x70;
+ // When the bus is free, the BCS bits in the EXTSTS register are 0b100
+ if(ret != 0x40) return IIC_ERR_LOST_ARB;
+
+ //
+ // Combined transaction (read and write)
+ //
+ if(num > 1) {
+ DEB2(printk(KERN_DEBUG "iic_xfer: Call combined transaction\n"));
+ ret = iic_combined_transaction(i2c_adap, msgs, num);
+ }
+ //
+ // Read only
+ //
+ else if((num == 1) && (pmsg->flags & I2C_M_RD)) {
+ //
+ // Tell device to begin reading data from the master data
+ //
+ DEB2(printk(KERN_DEBUG "iic_xfer: Call adapter's read\n"));
+ ret = iic_readbytes(i2c_adap, pmsg->buf, pmsg->len, IIC_SINGLE_XFER);
+ }
+ //
+ // Write only
+ //
+ else if((num == 1 ) && (!(pmsg->flags & I2C_M_RD))) {
+ //
+ // Write data to master data buffers and tell our device
+ // to begin transmitting
+ //
+ DEB2(printk(KERN_DEBUG "iic_xfer: Call adapter's write\n"));
+ ret = iic_sendbytes(i2c_adap, pmsg->buf, pmsg->len, IIC_SINGLE_XFER);
+ }
+
+ return ret;
+}
+
+
+//
+// Description: Implements device specific ioctls. Higher level ioctls can
+// be found in i2c-core.c and are typical of any i2c controller (specifying
+// slave address, timeouts, etc). These ioctls take advantage of any hardware
+// features built into the controller for which this algorithm-adapter set
+// was written. These ioctls allow you to take control of the data and clock
+// lines on the IBM PPC 405 IIC controller and set the either high or low,
+// similar to a GPIO pin.
+//
+static int algo_control(struct i2c_adapter *adapter,
+ unsigned int cmd, unsigned long arg)
+{
+ struct iic_regs *iic;
+ struct i2c_algo_iic_data *adap = adapter->algo_data;
+ struct iic_ibm *adap_priv_data = adap->data;
+ int ret=0;
+ int lines;
+ iic = (struct iic_regs *) adap_priv_data->iic_base;
+
+ lines = iic_inb(adap, iic->directcntl);
+
+ if (cmd == IICO_I2C_SDAHIGH) {
+ lines = lines & 0x01;
+ if( lines ) lines = 0x04;
+ else lines = 0;
+ iic_outb(adap, iic->directcntl,(0x08|lines));
+ }
+ else if (cmd == IICO_I2C_SDALOW) {
+ lines = lines & 0x01;
+ if( lines ) lines = 0x04;
+ else lines = 0;
+ iic_outb(adap, iic->directcntl,(0x00|lines));
+ }
+ else if (cmd == IICO_I2C_SCLHIGH) {
+ lines = lines & 0x02;
+ if( lines ) lines = 0x08;
+ else lines = 0;
+ iic_outb(adap, iic->directcntl,(0x04|lines));
+ }
+ else if (cmd == IICO_I2C_SCLLOW) {
+ lines = lines & 0x02;
+ if( lines ) lines = 0x08;
+ else lines = 0;
+ iic_outb(adap, iic->directcntl,(0x00|lines));
+ }
+ else if (cmd == IICO_I2C_LINEREAD) {
+ ret = lines;
+ }
+ return ret;
+}
+
+
+static u32 iic_func(struct i2c_adapter *adap)
+{
+ return I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR |
+ I2C_FUNC_PROTOCOL_MANGLING;
+}
+
+
+/* -----exported algorithm data: ------------------------------------- */
+
+static struct i2c_algorithm iic_algo = {
+ "IBM on-chip IIC algorithm",
+ I2C_ALGO_OCP,
+ iic_xfer,
+ NULL,
+ NULL, /* slave_xmit */
+ NULL, /* slave_recv */
+ algo_control, /* ioctl */
+ iic_func, /* functionality */
+};
+
+
+/*
+ * registering functions to load algorithms at runtime
+ */
+
+
+//
+// Description: Register bus structure
+//
+int i2c_iic_add_bus(struct i2c_adapter *adap)
+{
+ struct i2c_algo_iic_data *iic_adap = adap->algo_data;
+
+ DEB2(printk(KERN_DEBUG "i2c-algo-iic.o: hw routines for %s registered.\n",
+ adap->name));
+
+ /* register new adapter to i2c module... */
+
+ adap->id |= iic_algo.id;
+ adap->algo = &iic_algo;
+
+ adap->timeout = 100; /* default values, should */
+ adap->retries = 3; /* be replaced by defines */
+
+#ifdef MODULE
+ MOD_INC_USE_COUNT;
+#endif
+
+ iic_init(iic_adap);
+ i2c_add_adapter(adap);
+
+ /* scan bus */
+ /* By default scanning the bus is turned off. */
+ if (iic_scan) {
+ printk(KERN_INFO " i2c-algo-iic.o: scanning bus %s.\n",
+ adap->name);
+ }
+ return 0;
+}
+
+
+//
+// Done
+//
+int i2c_iic_del_bus(struct i2c_adapter *adap)
+{
+ int res;
+ if ((res = i2c_del_adapter(adap)) < 0)
+ return res;
+ DEB2(printk(KERN_DEBUG "i2c-algo-iic.o: adapter unregistered: %s\n",adap->name));
+
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+ return 0;
+}
+
+
+//
+// Done
+//
+int __init i2c_algo_iic_init (void)
+{
+ printk(KERN_INFO "IBM On-chip iic (i2c) algorithm module 2002.27.03\n");
+ return 0;
+}
+
+
+void i2c_algo_iic_exit(void)
+{
+ return;
+}
+
+
+EXPORT_SYMBOL(i2c_iic_add_bus);
+EXPORT_SYMBOL(i2c_iic_del_bus);
+
+//
+// The MODULE_* macros resolve to nothing if MODULES is not defined
+// when this file is compiled.
+//
+MODULE_AUTHOR("MontaVista Software <www.mvista.com>");
+MODULE_DESCRIPTION("PPC 405 iic algorithm");
+
+MODULE_PARM(iic_test, "i");
+MODULE_PARM(iic_scan, "i");
+MODULE_PARM(i2c_debug,"i");
+
+MODULE_PARM_DESC(iic_test, "Test if the I2C bus is available");
+MODULE_PARM_DESC(iic_scan, "Scan for active chips on the bus");
+MODULE_PARM_DESC(i2c_debug,
+ "debug level - 0 off; 1 normal; 2,3 more verbose; 9 iic-protocol");
+
+
+module_init(i2c_algo_iic_init);
+module_exit(i2c_algo_iic_exit);
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-algo-ibm_ocp.h 2002-07-03 21:00:38.000000000 -0400
@@ -0,0 +1,55 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-algo-ibm_ocp.h i2c driver algorithms for IBM PPC 405 IIC adapters */
+/* ------------------------------------------------------------------------- */
+/* Copyright (C) 1995-97 Simon G. Vogl
+ 1998-99 Hans Berglund
+
+ 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. */
+/* ------------------------------------------------------------------------- */
+
+/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi> and even
+ Frodo Looijaard <frodol@dds.nl> */
+
+/* Modifications by MontaVista Software, August 2000
+ Changes made to support the IIC peripheral on the IBM PPC 405 */
+
+#ifndef I2C_ALGO_IIC_H
+#define I2C_ALGO_IIC_H 1
+
+/* --- Defines for pcf-adapters --------------------------------------- */
+#include <linux/i2c.h>
+
+struct i2c_algo_iic_data {
+ struct iic_regs *data; /* private data for lolevel routines */
+ void (*setiic) (void *data, int ctl, int val);
+ int (*getiic) (void *data, int ctl);
+ int (*getown) (void *data);
+ int (*getclock) (void *data);
+ void (*waitforpin) (void *data);
+
+ /* local settings */
+ int udelay;
+ int mdelay;
+ int timeout;
+};
+
+
+#define I2C_IIC_ADAP_MAX 16
+
+
+int i2c_iic_add_bus(struct i2c_adapter *);
+int i2c_iic_del_bus(struct i2c_adapter *);
+
+#endif /* I2C_ALGO_IIC_H */
--- linux-2.5.26/drivers/i2c/i2c-elektor.c.orig 2002-07-05 19:42:02.000000000 -0400
+++ linux/drivers/i2c/i2c-elektor.c 2001-11-19 13:45:02.000000000 -0500
@@ -119,14 +119,15 @@
static void pcf_isa_waitforpin(void) {

int timeout = 2;
+ spinlock_t driver_lock = SPIN_LOCK_UNLOCKED;

if (irq > 0) {
- cli();
+ spin_lock_irq(&driver_lock);
if (pcf_pending == 0) {
interruptible_sleep_on_timeout(&pcf_wait, timeout*HZ );
} else
pcf_pending = 0;
- sti();
+ spin_unlock_irq(&driver_lock);
} else {
udelay(100);
}
@@ -297,6 +298,7 @@
return 0;
}

+EXPORT_NO_SYMBOLS;

#ifdef MODULE
MODULE_AUTHOR("Hans Berglund <hb@spacetec.no>");
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-frodo.c 2002-07-09 08:39:21.000000000 -0400
@@ -0,0 +1,118 @@
+
+/*
+ * linux/drivers/i2c/i2c-frodo.c
+ *
+ * Author: Abraham van der Merwe <abraham@2d3d.co.za>
+ *
+ * An I2C adapter driver for the 2d3D, Inc. StrongARM SA-1110
+ * Development board (Frodo).
+ *
+ * This source code is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ */
+
+#include <linux/config.h>
+#include <linux/version.h>
+#include <linux/module.h>
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+
+#include <asm/hardware.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+static void frodo_setsda (void *data,int state)
+{
+ if (state)
+ FRODO_CPLD_I2C |= FRODO_I2C_SDA_OUT;
+ else
+ FRODO_CPLD_I2C &= ~FRODO_I2C_SDA_OUT;
+}
+
+static void frodo_setscl (void *data,int state)
+{
+ if (state)
+ FRODO_CPLD_I2C |= FRODO_I2C_SCL_OUT;
+ else
+ FRODO_CPLD_I2C &= ~FRODO_I2C_SCL_OUT;
+}
+
+static int frodo_getsda (void *data)
+{
+ return ((FRODO_CPLD_I2C & FRODO_I2C_SDA_IN) != 0);
+}
+
+static int frodo_getscl (void *data)
+{
+ return ((FRODO_CPLD_I2C & FRODO_I2C_SCL_IN) != 0);
+}
+
+static struct i2c_algo_bit_data bit_frodo_data = {
+ setsda: frodo_setsda,
+ setscl: frodo_setscl,
+ getsda: frodo_getsda,
+ getscl: frodo_getscl,
+ udelay: 80,
+ mdelay: 80,
+ timeout: 100
+};
+
+static int frodo_client_register (struct i2c_client *client)
+{
+ return (0);
+}
+
+static int frodo_client_unregister (struct i2c_client *client)
+{
+ return (0);
+}
+
+static void frodo_inc_use (struct i2c_adapter *adapter)
+{
+ MOD_INC_USE_COUNT;
+}
+
+static void frodo_dec_use (struct i2c_adapter *adapter)
+{
+ MOD_DEC_USE_COUNT;
+}
+
+static struct i2c_adapter frodo_ops = {
+ name: "Frodo adapter driver",
+ id: I2C_HW_B_FRODO,
+ algo: NULL,
+ algo_data: &bit_frodo_data,
+ inc_use: frodo_inc_use,
+ dec_use: frodo_dec_use,
+ client_register: frodo_client_register,
+ client_unregister: frodo_client_unregister
+};
+
+static int __init i2c_frodo_init (void)
+{
+ return (i2c_bit_add_bus (&frodo_ops));
+}
+
+EXPORT_NO_SYMBOLS;
+
+static void __exit i2c_frodo_exit (void)
+{
+ i2c_bit_del_bus (&frodo_ops);
+}
+
+MODULE_AUTHOR ("Abraham van der Merwe <abraham@2d3d.co.za>");
+MODULE_DESCRIPTION ("I2C-Bus adapter routines for Frodo");
+
+#ifdef MODULE_LICENSE
+MODULE_LICENSE ("GPL");
+#endif /* #ifdef MODULE_LICENSE */
+
+EXPORT_NO_SYMBOLS;
+
+module_init (i2c_frodo_init);
+module_exit (i2c_frodo_exit);
+
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-pcf-epp.c 2002-07-09 21:29:56.000000000 -0400
@@ -0,0 +1,316 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-pcf-epp.c i2c-hw access for PCF8584 style EPP parallel port adapters */
+/* ------------------------------------------------------------------------- */
+
+#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/parport.h>
+#include <asm/irq.h>
+#include <asm/io.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-pcf.h>
+#include "i2c-pcf8584.h"
+
+struct i2c_pcf_epp {
+ int pe_base;
+ int pe_irq;
+ int pe_clock;
+ int pe_own;
+} ;
+
+#define DEFAULT_BASE 0x378
+#define DEFAULT_IRQ 7
+#define DEFAULT_CLOCK 0x1c
+#define DEFAULT_OWN 0x55
+
+static int base = 0;
+static int irq = 0;
+static int clock = 0;
+static int own = 0;
+static int i2c_debug=0;
+static struct i2c_pcf_epp gpe;
+#if (LINUX_VERSION_CODE < 0x020301)
+static struct wait_queue *pcf_wait = NULL;
+#else
+static wait_queue_head_t pcf_wait;
+#endif
+static int pcf_pending;
+
+/* ----- 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 */
+
+/* --- Convenience defines for the EPP/SPP port: */
+#define BASE ((struct i2c_pcf_epp *)(data))->pe_base
+// #define DATA BASE /* SPP data port */
+#define STAT (BASE+1) /* SPP status port */
+#define CTRL (BASE+2) /* SPP control port */
+#define EADD (BASE+3) /* EPP address port */
+#define EDAT (BASE+4) /* EPP data port */
+
+/* ----- local functions ---------------------------------------------- */
+
+static void pcf_epp_setbyte(void *data, int ctl, int val)
+{
+ if (ctl) {
+ if (gpe.pe_irq > 0) {
+ DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Write control 0x%x\n",
+ val|I2C_PCF_ENI));
+ // set A0 pin HIGH
+ outb(inb(CTRL) | PARPORT_CONTROL_INIT, CTRL);
+ // DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: CTRL port = 0x%x\n", inb(CTRL)));
+ // DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: STAT port = 0x%x\n", inb(STAT)));
+
+ // EPP write data cycle
+ outb(val | I2C_PCF_ENI, EDAT);
+ } else {
+ DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Write control 0x%x\n", val));
+ // set A0 pin HIGH
+ outb(inb(CTRL) | PARPORT_CONTROL_INIT, CTRL);
+ outb(val, CTRL);
+ }
+ } else {
+ DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Write data 0x%x\n", val));
+ // set A0 pin LO
+ outb(inb(CTRL) & ~PARPORT_CONTROL_INIT, CTRL);
+ // DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: CTRL port = 0x%x\n", inb(CTRL)));
+ // DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: STAT port = 0x%x\n", inb(STAT)));
+ outb(val, EDAT);
+ }
+}
+
+static int pcf_epp_getbyte(void *data, int ctl)
+{
+ int val;
+
+ if (ctl) {
+ // set A0 pin HIGH
+ outb(inb(CTRL) | PARPORT_CONTROL_INIT, CTRL);
+ val = inb(EDAT);
+ DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Read control 0x%x\n", val));
+ } else {
+ // set A0 pin LOW
+ outb(inb(CTRL) & ~PARPORT_CONTROL_INIT, CTRL);
+ val = inb(EDAT);
+ DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: Read data 0x%x\n", val));
+ }
+ return (val);
+}
+
+static int pcf_epp_getown(void *data)
+{
+ return (gpe.pe_own);
+}
+
+
+static int pcf_epp_getclock(void *data)
+{
+ return (gpe.pe_clock);
+}
+
+#if 0
+static void pcf_epp_sleep(unsigned long timeout)
+{
+ schedule_timeout( timeout * HZ);
+}
+#endif
+
+static void pcf_epp_waitforpin(void) {
+ int timeout = 10;
+ spinlock_t driver_lock = SPIN_LOCK_UNLOCKED;
+
+ if (gpe.pe_irq > 0) {
+ spin_lock_irq(&driver_lock);
+ if (pcf_pending == 0) {
+ interruptible_sleep_on_timeout(&pcf_wait, timeout*HZ);
+ //udelay(100);
+ } else {
+ pcf_pending = 0;
+ }
+ spin_unlock_irq(&driver_lock);
+ } else {
+ udelay(100);
+ }
+}
+
+static void pcf_epp_handler(int this_irq, void *dev_id, struct pt_regs *regs) {
+ pcf_pending = 1;
+ wake_up_interruptible(&pcf_wait);
+ DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: in interrupt handler.\n"));
+}
+
+
+static int pcf_epp_init(void *data)
+{
+ if (check_region(gpe.pe_base, 5) < 0 ) {
+
+ printk(KERN_WARNING "Could not request port region with base 0x%x\n", gpe.pe_base);
+ return -ENODEV;
+ } else {
+ request_region(gpe.pe_base, 5, "i2c (EPP parallel port adapter)");
+ }
+
+ DEB3(printk(KERN_DEBUG "i2c-pcf-epp.o: init status port = 0x%x\n", inb(0x379)));
+
+ if (gpe.pe_irq > 0) {
+ if (request_irq(gpe.pe_irq, pcf_epp_handler, 0, "PCF8584", 0) < 0) {
+ printk(KERN_NOTICE "i2c-pcf-epp.o: Request irq%d failed\n", gpe.pe_irq);
+ gpe.pe_irq = 0;
+ } else
+ disable_irq(gpe.pe_irq);
+ enable_irq(gpe.pe_irq);
+ }
+ // EPP mode initialize
+ // enable interrupt from nINTR pin
+ outb(inb(CTRL)|0x14, CTRL);
+ // clear ERROR bit of STAT
+ outb(inb(STAT)|0x01, STAT);
+ outb(inb(STAT)&~0x01,STAT);
+
+ return 0;
+}
+
+
+static void pcf_epp_exit(void)
+{
+ if (gpe.pe_irq > 0) {
+ disable_irq(gpe.pe_irq);
+ free_irq(gpe.pe_irq, 0);
+ }
+ release_region(gpe.pe_base , 5);
+}
+
+
+static int pcf_epp_reg(struct i2c_client *client)
+{
+ return 0;
+}
+
+
+static int pcf_epp_unreg(struct i2c_client *client)
+{
+ return 0;
+}
+
+static void pcf_epp_inc_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+ MOD_INC_USE_COUNT;
+#endif
+}
+
+static void pcf_epp_dec_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+}
+
+
+/* ------------------------------------------------------------------------
+ * Encapsulate the above functions in the correct operations structure.
+ * This is only done when more than one hardware adapter is supported.
+ */
+static struct i2c_algo_pcf_data pcf_epp_data = {
+ NULL,
+ pcf_epp_setbyte,
+ pcf_epp_getbyte,
+ pcf_epp_getown,
+ pcf_epp_getclock,
+ pcf_epp_waitforpin,
+ 80, 80, 100, /* waits, timeout */
+};
+
+static struct i2c_adapter pcf_epp_ops = {
+ "PCF8584 EPP adapter",
+ I2C_HW_P_LP,
+ NULL,
+ &pcf_epp_data,
+ pcf_epp_inc_use,
+ pcf_epp_dec_use,
+ pcf_epp_reg,
+ pcf_epp_unreg,
+};
+
+int __init i2c_pcfepp_init(void)
+{
+ struct i2c_pcf_epp *pepp = &gpe;
+
+ printk(KERN_DEBUG "i2c-pcf-epp.o: i2c pcf8584-epp adapter module version %s (%s)\n", I2C_VERSION, I2C_DATE);
+ if (base == 0)
+ pepp->pe_base = DEFAULT_BASE;
+ else
+ pepp->pe_base = base;
+
+ if (irq == 0)
+ pepp->pe_irq = DEFAULT_IRQ;
+ else if (irq<0) {
+ // switch off irq
+ pepp->pe_irq=0;
+ } else {
+ pepp->pe_irq = irq;
+ }
+ if (clock == 0)
+ pepp->pe_clock = DEFAULT_CLOCK;
+ else
+ pepp->pe_clock = clock;
+
+ if (own == 0)
+ pepp->pe_own = DEFAULT_OWN;
+ else
+ pepp->pe_own = own;
+
+ pcf_epp_data.data = (void *)pepp;
+#if (LINUX_VERSION_CODE >= 0x020301)
+ init_waitqueue_head(&pcf_wait);
+#endif
+ if (pcf_epp_init(pepp) == 0) {
+ int ret;
+ if ( (ret = i2c_pcf_add_bus(&pcf_epp_ops)) < 0) {
+ printk(KERN_WARNING "i2c_pcf_add_bus caused an error: %d\n",ret);
+ release_region(pepp->pe_base , 5);
+ return ret;
+ }
+ } else {
+
+ return -ENODEV;
+ }
+ printk(KERN_DEBUG "i2c-pcf-epp.o: found device at %#x.\n", pepp->pe_base);
+ return 0;
+}
+
+
+EXPORT_NO_SYMBOLS;
+
+#ifdef MODULE
+MODULE_AUTHOR("Hans Berglund <hb@spacetec.no> \n modified by Ryosuke Tajima <rosk@jsk.t.u-tokyo.ac.jp>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for PCF8584 EPP parallel port adapter");
+
+MODULE_PARM(base, "i");
+MODULE_PARM(irq, "i");
+MODULE_PARM(clock, "i");
+MODULE_PARM(own, "i");
+MODULE_PARM(i2c_debug, "i");
+
+int init_module(void)
+{
+ return i2c_pcfepp_init();
+}
+
+void cleanup_module(void)
+{
+ i2c_pcf_del_bus(&pcf_epp_ops);
+ pcf_epp_exit();
+}
+
+#endif
+
+
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-pport.c 2001-10-13 14:09:01.000000000 -0400
@@ -0,0 +1,254 @@
+/* ------------------------------------------------------------------------- */
+/* i2c-pport.c i2c-hw access for primitive i2c par. port adapter */
+/* ------------------------------------------------------------------------- */
+/* Copyright (C) 2001 Daniel Smolik
+
+ 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. */
+/* ------------------------------------------------------------------------- */
+
+/*
+ See doc/i2c-pport for instructions on wiring to the
+ parallel port connector.
+
+ Cut & paste :-) based on Velleman K9000 driver by Simon G. Vogl
+*/
+
+
+#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 <asm/io.h>
+#include <linux/errno.h>
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+#ifdef MODULE_LICENSE
+MODULE_LICENSE("GPL");
+#endif
+
+#define DEFAULT_BASE 0x378
+static int base=0;
+static unsigned char PortData = 0;
+
+/* ----- global defines ----------------------------------------------- */
+#define DEB(x) /* should be reasonable open, close &c. */
+#define DEB2(x) /* low level debugging - very slow */
+#define DEBE(x) x /* error messages */
+#define DEBINIT(x) x /* detection status messages */
+
+/* --- Convenience defines for the parallel port: */
+#define BASE (unsigned int)(data)
+#define DATA BASE /* Centronics data port */
+#define STAT (BASE+1) /* Centronics status port */
+#define CTRL (BASE+2) /* Centronics control port */
+
+/* we will use SDA - Auto Linefeed(14) bit 1 POUT */
+/* we will use SCL - Initialize printer(16) BUSY bit 2*/
+
+#define SET_SCL | 0x04
+#define CLR_SCL & 0xFB
+
+
+
+
+#define SET_SDA & 0x04
+#define CLR_SDA | 0x02
+
+
+/* ----- local functions ---------------------------------------------- */
+
+
+static void bit_pport_setscl(void *data, int state)
+{
+ if (state) {
+ //high
+ PortData = PortData SET_SCL;
+ } else {
+ //low
+ PortData = PortData CLR_SCL;
+ }
+ outb(PortData, CTRL);
+}
+
+static void bit_pport_setsda(void *data, int state)
+{
+ if (state) {
+
+ PortData = PortData SET_SDA;
+ } else {
+
+ PortData = PortData CLR_SDA;
+ }
+ outb(PortData, CTRL);
+}
+
+static int bit_pport_getscl(void *data)
+{
+
+ return ( 4 == ( (inb_p(CTRL)) & 0x04 ) );
+}
+
+static int bit_pport_getsda(void *data)
+{
+ return ( 0 == ( (inb_p(CTRL)) & 0x02 ) );
+}
+
+static int bit_pport_init(void)
+{
+ //release_region( (base+2) ,1);
+
+ if (check_region((base+2),1) < 0 ) {
+ return -ENODEV;
+ } else {
+
+ /* test for PPORT adap. */
+
+
+ PortData=inb(base+2);
+ PortData= (PortData SET_SDA) SET_SCL;
+ outb(PortData,base+2);
+
+ if (!(inb(base+2) | 0x06)) { /* SDA and SCL will be high */
+ DEBINIT(printk("i2c-pport.o: SDA and SCL was low.\n"));
+ return -ENODEV;
+ } else {
+
+ /*SCL high and SDA low*/
+ PortData = PortData SET_SCL CLR_SDA;
+ outb(PortData,base+2);
+ udelay(400);
+ if ( !(inb(base+2) | 0x4) ) {
+ //outb(0x04,base+2);
+ DEBINIT(printk("i2c-port.o: SDA was high.\n"));
+ return -ENODEV;
+ }
+ }
+ request_region((base+2),1,
+ "i2c (PPORT adapter)");
+ bit_pport_setsda((void*)base,1);
+ bit_pport_setscl((void*)base,1);
+ }
+ return 0;
+}
+
+static void bit_pport_exit(void)
+{
+ release_region((base+2),1);
+}
+
+static int bit_pport_reg(struct i2c_client *client)
+{
+ return 0;
+}
+
+static int bit_pport_unreg(struct i2c_client *client)
+{
+ release_region((base+2),1);
+ return 0;
+}
+
+static void bit_pport_inc_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+ MOD_INC_USE_COUNT;
+#endif
+}
+
+static void bit_pport_dec_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+}
+
+/* ------------------------------------------------------------------------
+ * Encapsulate the above functions in the correct operations structure.
+ * This is only done when more than one hardware adapter is supported.
+ */
+static struct i2c_algo_bit_data bit_pport_data = {
+ NULL,
+ bit_pport_setsda,
+ bit_pport_setscl,
+ bit_pport_getsda,
+ bit_pport_getscl,
+ //NULL,
+ 40, 80, 100, /* waits, timeout */
+};
+
+static struct i2c_adapter bit_pport_ops = {
+ "Primitive Parallel port adaptor",
+ I2C_HW_B_PPORT,
+ NULL,
+ &bit_pport_data,
+ bit_pport_inc_use,
+ bit_pport_dec_use,
+ bit_pport_reg,
+ bit_pport_unreg,
+};
+
+static int __init i2c_bitpport_init(void)
+{
+ printk("i2c-pport.o: i2c Primitive parallel port adapter module version %s (%s)\n", I2C_VERSION, I2C_DATE);
+
+ if (base==0) {
+ /* probe some values */
+ base=DEFAULT_BASE;
+ bit_pport_data.data=(void*)DEFAULT_BASE;
+ if (bit_pport_init()==0) {
+ if(i2c_bit_add_bus(&bit_pport_ops) < 0)
+ return -ENODEV;
+ } else {
+ return -ENODEV;
+ }
+ } else {
+ bit_pport_data.data=(void*)base;
+ if (bit_pport_init()==0) {
+ if(i2c_bit_add_bus(&bit_pport_ops) < 0)
+ return -ENODEV;
+ } else {
+ return -ENODEV;
+ }
+ }
+ printk("i2c-pport.o: found device at %#x.\n",base);
+ return 0;
+}
+
+
+EXPORT_NO_SYMBOLS;
+
+#ifdef MODULE
+MODULE_AUTHOR("Daniel Smolik <marvin@sitour.cz>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for Primitive parallel port adapter")
+;
+
+MODULE_PARM(base, "i");
+
+int init_module(void)
+{
+ return i2c_bitpport_init();
+}
+
+void cleanup_module(void)
+{
+ i2c_bit_del_bus(&bit_pport_ops);
+ bit_pport_exit();
+}
+
+#endif
--- /dev/null 1994-07-17 19:46:18.000000000 -0400
+++ linux/drivers/i2c/i2c-rpx.c 2002-06-11 22:29:54.000000000 -0400
@@ -0,0 +1,136 @@
+/*
+ * Embedded Planet RPX Lite MPC8xx CPM I2C interface.
+ * Copyright (c) 1999 Dan Malek (dmalek@jlc.net).
+ *
+ * moved into proper i2c interface;
+ * Brad Parker (brad@heeltoe.com)
+ *
+ * RPX lite specific parts of the i2c interface
+ * Update: There actually isn't anything RPXLite-specific about this module.
+ * This should work for most any 8xx board. The console messages have been
+ * changed to eliminate RPXLite references.
+ */
+
+#include <linux/kernel.h>
+#include <linux/ioport.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/stddef.h>
+#include <linux/parport.h>
+
+#include <asm/mpc8xx.h>
+#include <asm/commproc.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-8xx.h>
+
+static void
+rpx_iic_init(struct i2c_algo_8xx_data *data)
+{
+ volatile cpm8xx_t *cp;
+ volatile immap_t *immap;
+
+ cp = cpmp; /* Get pointer to Communication Processor */
+ immap = (immap_t *)IMAP_ADDR; /* and to internal registers */
+
+ data->iip = (iic_t *)&cp->cp_dparam[PROFF_IIC];
+
+ /* Check for and use a microcode relocation patch.
+ */
+ if ((data->reloc = data->iip->iic_rpbase))
+ data->iip = (iic_t *)&cp->cp_dpmem[data->iip->iic_rpbase];
+
+ data->i2c = (i2c8xx_t *)&(immap->im_i2c);
+ data->cp = cp;
+
+ /* Initialize Port B IIC pins.
+ */
+ cp->cp_pbpar |= 0x00000030;
+ cp->cp_pbdir |= 0x00000030;
+ cp->cp_pbodr |= 0x00000030;
+
+ /* Allocate space for two transmit and two receive buffer
+ * descriptors in the DP ram.
+ */
+ data->dp_addr = m8xx_cpm_dpalloc(sizeof(cbd_t) * 4);
+
+ /* ptr to i2c area */
+ data->i2c = (i2c8xx_t *)&(((immap_t *)IMAP_ADDR)->im_i2c);
+}
+
+static int rpx_install_isr(int irq, void (*func)(void *, void *), void *data)
+{
+ /* install interrupt handler */
+ cpm_install_handler(irq, (void (*)(void *, struct pt_regs *)) func, data);
+
+ return 0;
+}
+
+static int rpx_reg(struct i2c_client *client)
+{
+ return 0;
+}
+
+static int rpx_unreg(struct i2c_client *client)
+{
+ return 0;
+}
+
+static void rpx_inc_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+ MOD_INC_USE_COUNT;
+#endif
+}
+
+static void rpx_dec_use(struct i2c_adapter *adap)
+{
+#ifdef MODULE
+ MOD_DEC_USE_COUNT;
+#endif
+}
+
+static struct i2c_algo_8xx_data rpx_data = {
+ setisr: rpx_install_isr
+};
+
+
+static struct i2c_adapter rpx_ops = {
+ "m8xx",
+ I2C_HW_MPC8XX_EPON,
+ NULL,
+ &rpx_data,
+ rpx_inc_use,
+ rpx_dec_use,
+ rpx_reg,
+ rpx_unreg,
+};
+
+int __init i2c_rpx_init(void)
+{
+ printk("i2c-rpx.o: i2c MPC8xx module version %s (%s)\n", I2C_VERSION, I2C_DATE);
+
+ /* reset hardware to sane state */
+ rpx_iic_init(&rpx_data);
+
+ if (i2c_8xx_add_bus(&rpx_ops) < 0) {
+ printk("i2c-rpx: Unable to register with I2C\n");
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+void __exit i2c_rpx_exit(void)
+{
+ i2c_8xx_del_bus(&rpx_ops);
+}
+
+#ifdef MODULE
+MODULE_AUTHOR("Dan Malek <dmalek@jlc.net>");
+MODULE_DESCRIPTION("I2C-Bus adapter routines for MPC8xx boards");
+
+module_init(i2c_rpx_init);
+module_exit(i2c_rpx_exit);
+#endif
+
--
Albert Cranford Deerfield Beach FL USA
ac9410@bellsouth.net
-
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