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Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/busses/i2c-ibm_iic.c')
-rw-r--r--ANDROID_3.4.5/drivers/i2c/busses/i2c-ibm_iic.c818
1 files changed, 0 insertions, 818 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/busses/i2c-ibm_iic.c b/ANDROID_3.4.5/drivers/i2c/busses/i2c-ibm_iic.c
deleted file mode 100644
index 806e225f..00000000
--- a/ANDROID_3.4.5/drivers/i2c/busses/i2c-ibm_iic.c
+++ /dev/null
@@ -1,818 +0,0 @@
-/*
- * drivers/i2c/busses/i2c-ibm_iic.c
- *
- * Support for the IIC peripheral on IBM PPC 4xx
- *
- * Copyright (c) 2003, 2004 Zultys Technologies.
- * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
- *
- * Copyright (c) 2008 PIKA Technologies
- * Sean MacLennan <smaclennan@pikatech.com>
- *
- * Based on original work by
- * Ian DaSilva <idasilva@mvista.com>
- * Armin Kuster <akuster@mvista.com>
- * Matt Porter <mporter@mvista.com>
- *
- * Copyright 2000-2003 MontaVista Software Inc.
- *
- * Original driver version was highly leveraged from i2c-elektor.c
- *
- * Copyright 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.
- *
- */
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/ioport.h>
-#include <linux/delay.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <asm/irq.h>
-#include <linux/io.h>
-#include <linux/i2c.h>
-#include <linux/of_platform.h>
-#include <linux/of_i2c.h>
-
-#include "i2c-ibm_iic.h"
-
-#define DRIVER_VERSION "2.2"
-
-MODULE_DESCRIPTION("IBM IIC driver v" DRIVER_VERSION);
-MODULE_LICENSE("GPL");
-
-static bool iic_force_poll;
-module_param(iic_force_poll, bool, 0);
-MODULE_PARM_DESC(iic_force_poll, "Force polling mode");
-
-static bool iic_force_fast;
-module_param(iic_force_fast, bool, 0);
-MODULE_PARM_DESC(iic_force_fast, "Force fast mode (400 kHz)");
-
-#define DBG_LEVEL 0
-
-#ifdef DBG
-#undef DBG
-#endif
-
-#ifdef DBG2
-#undef DBG2
-#endif
-
-#if DBG_LEVEL > 0
-# define DBG(f,x...) printk(KERN_DEBUG "ibm-iic" f, ##x)
-#else
-# define DBG(f,x...) ((void)0)
-#endif
-#if DBG_LEVEL > 1
-# define DBG2(f,x...) DBG(f, ##x)
-#else
-# define DBG2(f,x...) ((void)0)
-#endif
-#if DBG_LEVEL > 2
-static void dump_iic_regs(const char* header, struct ibm_iic_private* dev)
-{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- printk(KERN_DEBUG "ibm-iic%d: %s\n", dev->idx, header);
- printk(KERN_DEBUG
- " cntl = 0x%02x, mdcntl = 0x%02x\n"
- " sts = 0x%02x, extsts = 0x%02x\n"
- " clkdiv = 0x%02x, xfrcnt = 0x%02x\n"
- " xtcntlss = 0x%02x, directcntl = 0x%02x\n",
- in_8(&iic->cntl), in_8(&iic->mdcntl), in_8(&iic->sts),
- in_8(&iic->extsts), in_8(&iic->clkdiv), in_8(&iic->xfrcnt),
- in_8(&iic->xtcntlss), in_8(&iic->directcntl));
-}
-# define DUMP_REGS(h,dev) dump_iic_regs((h),(dev))
-#else
-# define DUMP_REGS(h,dev) ((void)0)
-#endif
-
-/* Bus timings (in ns) for bit-banging */
-static struct i2c_timings {
- unsigned int hd_sta;
- unsigned int su_sto;
- unsigned int low;
- unsigned int high;
- unsigned int buf;
-} timings [] = {
-/* Standard mode (100 KHz) */
-{
- .hd_sta = 4000,
- .su_sto = 4000,
- .low = 4700,
- .high = 4000,
- .buf = 4700,
-},
-/* Fast mode (400 KHz) */
-{
- .hd_sta = 600,
- .su_sto = 600,
- .low = 1300,
- .high = 600,
- .buf = 1300,
-}};
-
-/* Enable/disable interrupt generation */
-static inline void iic_interrupt_mode(struct ibm_iic_private* dev, int enable)
-{
- out_8(&dev->vaddr->intmsk, enable ? INTRMSK_EIMTC : 0);
-}
-
-/*
- * Initialize IIC interface.
- */
-static void iic_dev_init(struct ibm_iic_private* dev)
-{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
-
- DBG("%d: init\n", dev->idx);
-
- /* Clear master address */
- out_8(&iic->lmadr, 0);
- out_8(&iic->hmadr, 0);
-
- /* Clear slave address */
- out_8(&iic->lsadr, 0);
- out_8(&iic->hsadr, 0);
-
- /* Clear status & extended status */
- out_8(&iic->sts, STS_SCMP | STS_IRQA);
- out_8(&iic->extsts, EXTSTS_IRQP | EXTSTS_IRQD | EXTSTS_LA
- | EXTSTS_ICT | EXTSTS_XFRA);
-
- /* Set clock divider */
- out_8(&iic->clkdiv, dev->clckdiv);
-
- /* Clear transfer count */
- out_8(&iic->xfrcnt, 0);
-
- /* Clear extended control and status */
- out_8(&iic->xtcntlss, XTCNTLSS_SRC | XTCNTLSS_SRS | XTCNTLSS_SWC
- | XTCNTLSS_SWS);
-
- /* Clear control register */
- out_8(&iic->cntl, 0);
-
- /* Enable interrupts if possible */
- iic_interrupt_mode(dev, dev->irq >= 0);
-
- /* Set mode control */
- out_8(&iic->mdcntl, MDCNTL_FMDB | MDCNTL_EINT | MDCNTL_EUBS
- | (dev->fast_mode ? MDCNTL_FSM : 0));
-
- DUMP_REGS("iic_init", dev);
-}
-
-/*
- * Reset IIC interface
- */
-static void iic_dev_reset(struct ibm_iic_private* dev)
-{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- int i;
- u8 dc;
-
- DBG("%d: soft reset\n", dev->idx);
- DUMP_REGS("reset", dev);
-
- /* Place chip in the reset state */
- out_8(&iic->xtcntlss, XTCNTLSS_SRST);
-
- /* Check if bus is free */
- dc = in_8(&iic->directcntl);
- if (!DIRCTNL_FREE(dc)){
- DBG("%d: trying to regain bus control\n", dev->idx);
-
- /* Try to set bus free state */
- out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC);
-
- /* Wait until we regain bus control */
- for (i = 0; i < 100; ++i){
- dc = in_8(&iic->directcntl);
- if (DIRCTNL_FREE(dc))
- break;
-
- /* Toggle SCL line */
- dc ^= DIRCNTL_SCC;
- out_8(&iic->directcntl, dc);
- udelay(10);
- dc ^= DIRCNTL_SCC;
- out_8(&iic->directcntl, dc);
-
- /* be nice */
- cond_resched();
- }
- }
-
- /* Remove reset */
- out_8(&iic->xtcntlss, 0);
-
- /* Reinitialize interface */
- iic_dev_init(dev);
-}
-
-/*
- * Do 0-length transaction using bit-banging through IIC_DIRECTCNTL register.
- */
-
-/* Wait for SCL and/or SDA to be high */
-static int iic_dc_wait(volatile struct iic_regs __iomem *iic, u8 mask)
-{
- unsigned long x = jiffies + HZ / 28 + 2;
- while ((in_8(&iic->directcntl) & mask) != mask){
- if (unlikely(time_after(jiffies, x)))
- return -1;
- cond_resched();
- }
- return 0;
-}
-
-static int iic_smbus_quick(struct ibm_iic_private* dev, const struct i2c_msg* p)
-{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- const struct i2c_timings* t = &timings[dev->fast_mode ? 1 : 0];
- u8 mask, v, sda;
- int i, res;
-
- /* Only 7-bit addresses are supported */
- if (unlikely(p->flags & I2C_M_TEN)){
- DBG("%d: smbus_quick - 10 bit addresses are not supported\n",
- dev->idx);
- return -EINVAL;
- }
-
- DBG("%d: smbus_quick(0x%02x)\n", dev->idx, p->addr);
-
- /* Reset IIC interface */
- out_8(&iic->xtcntlss, XTCNTLSS_SRST);
-
- /* Wait for bus to become free */
- out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC);
- if (unlikely(iic_dc_wait(iic, DIRCNTL_MSDA | DIRCNTL_MSC)))
- goto err;
- ndelay(t->buf);
-
- /* START */
- out_8(&iic->directcntl, DIRCNTL_SCC);
- sda = 0;
- ndelay(t->hd_sta);
-
- /* Send address */
- v = (u8)((p->addr << 1) | ((p->flags & I2C_M_RD) ? 1 : 0));
- for (i = 0, mask = 0x80; i < 8; ++i, mask >>= 1){
- out_8(&iic->directcntl, sda);
- ndelay(t->low / 2);
- sda = (v & mask) ? DIRCNTL_SDAC : 0;
- out_8(&iic->directcntl, sda);
- ndelay(t->low / 2);
-
- out_8(&iic->directcntl, DIRCNTL_SCC | sda);
- if (unlikely(iic_dc_wait(iic, DIRCNTL_MSC)))
- goto err;
- ndelay(t->high);
- }
-
- /* ACK */
- out_8(&iic->directcntl, sda);
- ndelay(t->low / 2);
- out_8(&iic->directcntl, DIRCNTL_SDAC);
- ndelay(t->low / 2);
- out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC);
- if (unlikely(iic_dc_wait(iic, DIRCNTL_MSC)))
- goto err;
- res = (in_8(&iic->directcntl) & DIRCNTL_MSDA) ? -EREMOTEIO : 1;
- ndelay(t->high);
-
- /* STOP */
- out_8(&iic->directcntl, 0);
- ndelay(t->low);
- out_8(&iic->directcntl, DIRCNTL_SCC);
- if (unlikely(iic_dc_wait(iic, DIRCNTL_MSC)))
- goto err;
- ndelay(t->su_sto);
- out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC);
-
- ndelay(t->buf);
-
- DBG("%d: smbus_quick -> %s\n", dev->idx, res ? "NACK" : "ACK");
-out:
- /* Remove reset */
- out_8(&iic->xtcntlss, 0);
-
- /* Reinitialize interface */
- iic_dev_init(dev);
-
- return res;
-err:
- DBG("%d: smbus_quick - bus is stuck\n", dev->idx);
- res = -EREMOTEIO;
- goto out;
-}
-
-/*
- * IIC interrupt handler
- */
-static irqreturn_t iic_handler(int irq, void *dev_id)
-{
- struct ibm_iic_private* dev = (struct ibm_iic_private*)dev_id;
- volatile struct iic_regs __iomem *iic = dev->vaddr;
-
- DBG2("%d: irq handler, STS = 0x%02x, EXTSTS = 0x%02x\n",
- dev->idx, in_8(&iic->sts), in_8(&iic->extsts));
-
- /* Acknowledge IRQ and wakeup iic_wait_for_tc */
- out_8(&iic->sts, STS_IRQA | STS_SCMP);
- wake_up_interruptible(&dev->wq);
-
- return IRQ_HANDLED;
-}
-
-/*
- * Get master transfer result and clear errors if any.
- * Returns the number of actually transferred bytes or error (<0)
- */
-static int iic_xfer_result(struct ibm_iic_private* dev)
-{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
-
- if (unlikely(in_8(&iic->sts) & STS_ERR)){
- DBG("%d: xfer error, EXTSTS = 0x%02x\n", dev->idx,
- in_8(&iic->extsts));
-
- /* Clear errors and possible pending IRQs */
- out_8(&iic->extsts, EXTSTS_IRQP | EXTSTS_IRQD |
- EXTSTS_LA | EXTSTS_ICT | EXTSTS_XFRA);
-
- /* Flush master data buffer */
- out_8(&iic->mdcntl, in_8(&iic->mdcntl) | MDCNTL_FMDB);
-
- /* Is bus free?
- * If error happened during combined xfer
- * IIC interface is usually stuck in some strange
- * state, the only way out - soft reset.
- */
- if ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){
- DBG("%d: bus is stuck, resetting\n", dev->idx);
- iic_dev_reset(dev);
- }
- return -EREMOTEIO;
- }
- else
- return in_8(&iic->xfrcnt) & XFRCNT_MTC_MASK;
-}
-
-/*
- * Try to abort active transfer.
- */
-static void iic_abort_xfer(struct ibm_iic_private* dev)
-{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- unsigned long x;
-
- DBG("%d: iic_abort_xfer\n", dev->idx);
-
- out_8(&iic->cntl, CNTL_HMT);
-
- /*
- * Wait for the abort command to complete.
- * It's not worth to be optimized, just poll (timeout >= 1 tick)
- */
- x = jiffies + 2;
- while ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){
- if (time_after(jiffies, x)){
- DBG("%d: abort timeout, resetting...\n", dev->idx);
- iic_dev_reset(dev);
- return;
- }
- schedule();
- }
-
- /* Just to clear errors */
- iic_xfer_result(dev);
-}
-
-/*
- * Wait for master transfer to complete.
- * It puts current process to sleep until we get interrupt or timeout expires.
- * Returns the number of transferred bytes or error (<0)
- */
-static int iic_wait_for_tc(struct ibm_iic_private* dev){
-
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- int ret = 0;
-
- if (dev->irq >= 0){
- /* Interrupt mode */
- ret = wait_event_interruptible_timeout(dev->wq,
- !(in_8(&iic->sts) & STS_PT), dev->adap.timeout);
-
- if (unlikely(ret < 0))
- DBG("%d: wait interrupted\n", dev->idx);
- else if (unlikely(in_8(&iic->sts) & STS_PT)){
- DBG("%d: wait timeout\n", dev->idx);
- ret = -ETIMEDOUT;
- }
- }
- else {
- /* Polling mode */
- unsigned long x = jiffies + dev->adap.timeout;
-
- while (in_8(&iic->sts) & STS_PT){
- if (unlikely(time_after(jiffies, x))){
- DBG("%d: poll timeout\n", dev->idx);
- ret = -ETIMEDOUT;
- break;
- }
-
- if (unlikely(signal_pending(current))){
- DBG("%d: poll interrupted\n", dev->idx);
- ret = -ERESTARTSYS;
- break;
- }
- schedule();
- }
- }
-
- if (unlikely(ret < 0))
- iic_abort_xfer(dev);
- else
- ret = iic_xfer_result(dev);
-
- DBG2("%d: iic_wait_for_tc -> %d\n", dev->idx, ret);
-
- return ret;
-}
-
-/*
- * Low level master transfer routine
- */
-static int iic_xfer_bytes(struct ibm_iic_private* dev, struct i2c_msg* pm,
- int combined_xfer)
-{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- char* buf = pm->buf;
- int i, j, loops, ret = 0;
- int len = pm->len;
-
- u8 cntl = (in_8(&iic->cntl) & CNTL_AMD) | CNTL_PT;
- if (pm->flags & I2C_M_RD)
- cntl |= CNTL_RW;
-
- loops = (len + 3) / 4;
- for (i = 0; i < loops; ++i, len -= 4){
- int count = len > 4 ? 4 : len;
- u8 cmd = cntl | ((count - 1) << CNTL_TCT_SHIFT);
-
- if (!(cntl & CNTL_RW))
- for (j = 0; j < count; ++j)
- out_8((void __iomem *)&iic->mdbuf, *buf++);
-
- if (i < loops - 1)
- cmd |= CNTL_CHT;
- else if (combined_xfer)
- cmd |= CNTL_RPST;
-
- DBG2("%d: xfer_bytes, %d, CNTL = 0x%02x\n", dev->idx, count, cmd);
-
- /* Start transfer */
- out_8(&iic->cntl, cmd);
-
- /* Wait for completion */
- ret = iic_wait_for_tc(dev);
-
- if (unlikely(ret < 0))
- break;
- else if (unlikely(ret != count)){
- DBG("%d: xfer_bytes, requested %d, transferred %d\n",
- dev->idx, count, ret);
-
- /* If it's not a last part of xfer, abort it */
- if (combined_xfer || (i < loops - 1))
- iic_abort_xfer(dev);
-
- ret = -EREMOTEIO;
- break;
- }
-
- if (cntl & CNTL_RW)
- for (j = 0; j < count; ++j)
- *buf++ = in_8((void __iomem *)&iic->mdbuf);
- }
-
- return ret > 0 ? 0 : ret;
-}
-
-/*
- * Set target slave address for master transfer
- */
-static inline void iic_address(struct ibm_iic_private* dev, struct i2c_msg* msg)
-{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- u16 addr = msg->addr;
-
- DBG2("%d: iic_address, 0x%03x (%d-bit)\n", dev->idx,
- addr, msg->flags & I2C_M_TEN ? 10 : 7);
-
- if (msg->flags & I2C_M_TEN){
- out_8(&iic->cntl, CNTL_AMD);
- out_8(&iic->lmadr, addr);
- out_8(&iic->hmadr, 0xf0 | ((addr >> 7) & 0x06));
- }
- else {
- out_8(&iic->cntl, 0);
- out_8(&iic->lmadr, addr << 1);
- }
-}
-
-static inline int iic_invalid_address(const struct i2c_msg* p)
-{
- return (p->addr > 0x3ff) || (!(p->flags & I2C_M_TEN) && (p->addr > 0x7f));
-}
-
-static inline int iic_address_neq(const struct i2c_msg* p1,
- const struct i2c_msg* p2)
-{
- return (p1->addr != p2->addr)
- || ((p1->flags & I2C_M_TEN) != (p2->flags & I2C_M_TEN));
-}
-
-/*
- * Generic master transfer entrypoint.
- * Returns the number of processed messages or error (<0)
- */
-static int iic_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
-{
- struct ibm_iic_private* dev = (struct ibm_iic_private*)(i2c_get_adapdata(adap));
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- int i, ret = 0;
-
- DBG2("%d: iic_xfer, %d msg(s)\n", dev->idx, num);
-
- if (!num)
- return 0;
-
- /* Check the sanity of the passed messages.
- * Uhh, generic i2c layer is more suitable place for such code...
- */
- if (unlikely(iic_invalid_address(&msgs[0]))){
- DBG("%d: invalid address 0x%03x (%d-bit)\n", dev->idx,
- msgs[0].addr, msgs[0].flags & I2C_M_TEN ? 10 : 7);
- return -EINVAL;
- }
- for (i = 0; i < num; ++i){
- if (unlikely(msgs[i].len <= 0)){
- if (num == 1 && !msgs[0].len){
- /* Special case for I2C_SMBUS_QUICK emulation.
- * IBM IIC doesn't support 0-length transactions
- * so we have to emulate them using bit-banging.
- */
- return iic_smbus_quick(dev, &msgs[0]);
- }
- DBG("%d: invalid len %d in msg[%d]\n", dev->idx,
- msgs[i].len, i);
- return -EINVAL;
- }
- if (unlikely(iic_address_neq(&msgs[0], &msgs[i]))){
- DBG("%d: invalid addr in msg[%d]\n", dev->idx, i);
- return -EINVAL;
- }
- }
-
- /* Check bus state */
- if (unlikely((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE)){
- DBG("%d: iic_xfer, bus is not free\n", dev->idx);
-
- /* Usually it means something serious has happened.
- * We *cannot* have unfinished previous transfer
- * so it doesn't make any sense to try to stop it.
- * Probably we were not able to recover from the
- * previous error.
- * The only *reasonable* thing I can think of here
- * is soft reset. --ebs
- */
- iic_dev_reset(dev);
-
- if ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){
- DBG("%d: iic_xfer, bus is still not free\n", dev->idx);
- return -EREMOTEIO;
- }
- }
- else {
- /* Flush master data buffer (just in case) */
- out_8(&iic->mdcntl, in_8(&iic->mdcntl) | MDCNTL_FMDB);
- }
-
- /* Load slave address */
- iic_address(dev, &msgs[0]);
-
- /* Do real transfer */
- for (i = 0; i < num && !ret; ++i)
- ret = iic_xfer_bytes(dev, &msgs[i], i < num - 1);
-
- return ret < 0 ? ret : num;
-}
-
-static u32 iic_func(struct i2c_adapter *adap)
-{
- return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL | I2C_FUNC_10BIT_ADDR;
-}
-
-static const struct i2c_algorithm iic_algo = {
- .master_xfer = iic_xfer,
- .functionality = iic_func
-};
-
-/*
- * Calculates IICx_CLCKDIV value for a specific OPB clock frequency
- */
-static inline u8 iic_clckdiv(unsigned int opb)
-{
- /* Compatibility kludge, should go away after all cards
- * are fixed to fill correct value for opbfreq.
- * Previous driver version used hardcoded divider value 4,
- * it corresponds to OPB frequency from the range (40, 50] MHz
- */
- if (!opb){
- printk(KERN_WARNING "ibm-iic: using compatibility value for OPB freq,"
- " fix your board specific setup\n");
- opb = 50000000;
- }
-
- /* Convert to MHz */
- opb /= 1000000;
-
- if (opb < 20 || opb > 150){
- printk(KERN_WARNING "ibm-iic: invalid OPB clock frequency %u MHz\n",
- opb);
- opb = opb < 20 ? 20 : 150;
- }
- return (u8)((opb + 9) / 10 - 1);
-}
-
-static int __devinit iic_request_irq(struct platform_device *ofdev,
- struct ibm_iic_private *dev)
-{
- struct device_node *np = ofdev->dev.of_node;
- int irq;
-
- if (iic_force_poll)
- return 0;
-
- irq = irq_of_parse_and_map(np, 0);
- if (!irq) {
- dev_err(&ofdev->dev, "irq_of_parse_and_map failed\n");
- return 0;
- }
-
- /* Disable interrupts until we finish initialization, assumes
- * level-sensitive IRQ setup...
- */
- iic_interrupt_mode(dev, 0);
- if (request_irq(irq, iic_handler, 0, "IBM IIC", dev)) {
- dev_err(&ofdev->dev, "request_irq %d failed\n", irq);
- /* Fallback to the polling mode */
- return 0;
- }
-
- return irq;
-}
-
-/*
- * Register single IIC interface
- */
-static int __devinit iic_probe(struct platform_device *ofdev)
-{
- struct device_node *np = ofdev->dev.of_node;
- struct ibm_iic_private *dev;
- struct i2c_adapter *adap;
- const u32 *freq;
- int ret;
-
- dev = kzalloc(sizeof(*dev), GFP_KERNEL);
- if (!dev) {
- dev_err(&ofdev->dev, "failed to allocate device data\n");
- return -ENOMEM;
- }
-
- dev_set_drvdata(&ofdev->dev, dev);
-
- dev->vaddr = of_iomap(np, 0);
- if (dev->vaddr == NULL) {
- dev_err(&ofdev->dev, "failed to iomap device\n");
- ret = -ENXIO;
- goto error_cleanup;
- }
-
- init_waitqueue_head(&dev->wq);
-
- dev->irq = iic_request_irq(ofdev, dev);
- if (!dev->irq)
- dev_warn(&ofdev->dev, "using polling mode\n");
-
- /* Board specific settings */
- if (iic_force_fast || of_get_property(np, "fast-mode", NULL))
- dev->fast_mode = 1;
-
- freq = of_get_property(np, "clock-frequency", NULL);
- if (freq == NULL) {
- freq = of_get_property(np->parent, "clock-frequency", NULL);
- if (freq == NULL) {
- dev_err(&ofdev->dev, "Unable to get bus frequency\n");
- ret = -EINVAL;
- goto error_cleanup;
- }
- }
-
- dev->clckdiv = iic_clckdiv(*freq);
- dev_dbg(&ofdev->dev, "clckdiv = %d\n", dev->clckdiv);
-
- /* Initialize IIC interface */
- iic_dev_init(dev);
-
- /* Register it with i2c layer */
- adap = &dev->adap;
- adap->dev.parent = &ofdev->dev;
- adap->dev.of_node = of_node_get(np);
- strlcpy(adap->name, "IBM IIC", sizeof(adap->name));
- i2c_set_adapdata(adap, dev);
- adap->class = I2C_CLASS_HWMON | I2C_CLASS_SPD;
- adap->algo = &iic_algo;
- adap->timeout = HZ;
-
- ret = i2c_add_adapter(adap);
- if (ret < 0) {
- dev_err(&ofdev->dev, "failed to register i2c adapter\n");
- goto error_cleanup;
- }
-
- dev_info(&ofdev->dev, "using %s mode\n",
- dev->fast_mode ? "fast (400 kHz)" : "standard (100 kHz)");
-
- /* Now register all the child nodes */
- of_i2c_register_devices(adap);
-
- return 0;
-
-error_cleanup:
- if (dev->irq) {
- iic_interrupt_mode(dev, 0);
- free_irq(dev->irq, dev);
- }
-
- if (dev->vaddr)
- iounmap(dev->vaddr);
-
- dev_set_drvdata(&ofdev->dev, NULL);
- kfree(dev);
- return ret;
-}
-
-/*
- * Cleanup initialized IIC interface
- */
-static int __devexit iic_remove(struct platform_device *ofdev)
-{
- struct ibm_iic_private *dev = dev_get_drvdata(&ofdev->dev);
-
- dev_set_drvdata(&ofdev->dev, NULL);
-
- i2c_del_adapter(&dev->adap);
-
- if (dev->irq) {
- iic_interrupt_mode(dev, 0);
- free_irq(dev->irq, dev);
- }
-
- iounmap(dev->vaddr);
- kfree(dev);
-
- return 0;
-}
-
-static const struct of_device_id ibm_iic_match[] = {
- { .compatible = "ibm,iic", },
- {}
-};
-
-static struct platform_driver ibm_iic_driver = {
- .driver = {
- .name = "ibm-iic",
- .owner = THIS_MODULE,
- .of_match_table = ibm_iic_match,
- },
- .probe = iic_probe,
- .remove = __devexit_p(iic_remove),
-};
-
-module_platform_driver(ibm_iic_driver);
generated by cgit (git 2.34.1) at 2025-03-30 20:06:04 +0000