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iccom_driver.c
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/*
* Copyright (c) 2016, Renesas Electronics Corporation
*
* This program 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.
*
* 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.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/sched.h>
#include <linux/jiffies.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/errno.h>
#include <linux/of_address.h>
#include <linux/uaccess.h>
#include <linux/spinlock.h>
#include <linux/semaphore.h>
#include <linux/mutex.h>
#include <linux/wait.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/version.h>
#include "iccom.h"
#include "iccom_core.h"
#include "iccom_driver.h"
static int32_t iccom_drv_open(struct iccom *iccom,
struct iccom_channel **channel_out);
static ssize_t iccom_drv_read(struct iccom_channel *channel,
struct iccom_cmd *cmd);
static ssize_t iccom_drv_write(struct iccom_channel *channel,
struct iccom_cmd *cmd);
static int32_t iccom_drv_ioctl(struct iccom_channel *channel,
int32_t req, void *arg);
static int32_t iccom_drv_close(struct iccom_channel *channel);
static irqreturn_t iccom_drv_isr(int irq, void *dev_id);
static int32_t iccom_drv_write_mfis(struct iccom_channel *channel,
uint32_t write_data, size_t msg_size);
static int32_t iccom_drv_poll_int_clear(uint32_t *iicr_add, int32_t timer);
static int32_t iccom_drv_probe(struct platform_device *pdev);
static int32_t iccom_drv_remove(struct platform_device *pdev);
static int32_t iccom_drv_init(void);
static void iccom_drv_exit(void);
static void iccom_drv_device_release(struct device *dev);
static void iccom_drv_release_channel(struct iccom_channel *channel);
static void iccom_drv_release_iccom(struct iccom *iccom, uint8_t request_flg);
static int32_t iccom_drv_poll_int_clear(uint32_t *iicr_add, int32_t timer)
{
int32_t i;
uint32_t check_mfis;
int32_t ret;
pr_debug("%s: Start\n", __func__);
for (i = 0; i < timer; i++) {
check_mfis = ioread32(iicr_add);
if ((check_mfis & ICCOM_CTRL_INT) == 0U) {
break;
}
usleep_range(ICCOM_WAIT_TIMER_US, ICCOM_WAIT_TIMER_US + 1U);
}
if (i < timer) {
ret = ICCOM_OK;
} else {
ret = -EDEADLK;
}
pr_debug("%s: End ret = %d, count = %d\n", __func__, ret, i);
return ret;
}
static int32_t iccom_drv_write_mfis(struct iccom_channel *channel,
uint32_t write_data, size_t msg_size)
{
int32_t ret;
struct iccom_communication_info *iccom_comm;
struct iccom_hardware_info *iccom_hw;
pr_debug("%s: Start write_data = 0x%x, msg_size = %zd\n",
__func__, write_data, msg_size);
iccom_comm = (struct iccom_communication_info *)channel->priv;
iccom_hw = (struct iccom_hardware_info *)channel->iccom->priv;
mutex_lock(&iccom_comm->mutex_poll_intbit);
ret = iccom_drv_poll_int_clear(iccom_comm->mfis_iicr_addr,
iccom_hw->trg_timeout);
if (ret == ICCOM_OK) {
iowrite32(msg_size, iccom_comm->mfis_imbr_addr);
iowrite32(write_data, iccom_comm->mfis_iicr_addr);
}
mutex_unlock(&iccom_comm->mutex_poll_intbit);
pr_debug("%s: End ret = %d\n", __func__, ret);
return ret;
}
static int32_t iccom_drv_open(struct iccom *iccom,
struct iccom_channel **channel_out)
{
int32_t ret = ICCOM_OK;
struct iccom_channel *l_channel = NULL;
struct iccom_communication_info *iccom_comm = NULL;
struct iccom_hardware_info *iccom_hw;
uint32_t write_iicr;
uint32_t copy_eicr;
void __iomem *remap_addr;
dev_dbg(iccom->dev, "%s: Start\n", __func__);
mutex_lock(&iccom->mutex_channel_open);
if ((iccom->flg & ICCOM_FLG_CH_OPEN) == 0U) {
pr_debug("Open route\n");
iccom->flg |= ICCOM_FLG_CH_OPEN;
mutex_unlock(&iccom->mutex_channel_open);
l_channel = (struct iccom_channel *)devm_kzalloc(
iccom->dev,
sizeof(struct iccom_channel) +
sizeof(struct iccom_communication_info),
GFP_KERNEL);
if (l_channel == NULL) {
ret = -ENOMEM;
dev_err(iccom->dev, "[Err]No enough memory\n");
}
} else {
ret = -EBUSY;
dev_err(iccom->dev, "[Err]This channel already open\n");
mutex_unlock(&iccom->mutex_channel_open);
}
if (ret == ICCOM_OK) {
l_channel->iccom = iccom;
l_channel->priv = &l_channel[1];
iccom_comm = (struct iccom_communication_info *)l_channel->priv;
iccom_hw = (struct iccom_hardware_info *)iccom->priv;
iccom_comm->read_status = ICCOM_READ_STATE_WAIT_READ;
iccom_comm->write_status[ICCOM_CTA_UPPER] =
ICCOM_WRITE_STATE_WAIT_WRITE;
iccom_comm->write_status[ICCOM_CTA_BOTTOM] =
ICCOM_WRITE_STATE_WAIT_WRITE;
(void)memset(&iccom_comm->ack_arrive, 0,
sizeof(iccom_comm->ack_arrive));
(void)memset(&iccom_comm->recv_index, 0,
sizeof(iccom_comm->recv_index));
(void)memset(&iccom_comm->recv_eicr, 0,
sizeof(iccom_comm->recv_eicr));
(void)memset(&iccom_comm->recv_embr, 0,
sizeof(iccom_comm->recv_embr));
(void)memset(&iccom_comm->ack_embr, 0,
sizeof(iccom_comm->ack_embr));
(void)memset(&iccom_comm->cta_flg, 0,
sizeof(iccom_comm->cta_flg));
sema_init(&iccom_comm->sem_send_cta, ICCOM_CTA_SBUF_NUM);
mutex_init(&iccom_comm->mutex_poll_intbit);
spin_lock_init(&iccom_comm->spinlock_mfis_info);
spin_lock_init(&iccom_comm->spinlock_cta_flg);
init_waitqueue_head(&iccom_comm->write_q);
init_waitqueue_head(&iccom_comm->read_q);
init_waitqueue_head(&iccom_comm->ioctl_q);
iccom_comm->close_flg = 0;
remap_addr = ioremap_nocache(
(uintptr_t)iccom_hw->mfis_iicr_addr, ICCOM_MFIS_LEN);
if (remap_addr == NULL) {
dev_err(iccom->dev, "[Err]Remap IICR failed\n");
ret = -ENOMEM;
} else {
iccom_comm->mfis_iicr_addr = (uint32_t *)remap_addr;
}
remap_addr = ioremap_nocache(
(uintptr_t)iccom_hw->mfis_eicr_addr, ICCOM_MFIS_LEN);
if (remap_addr == NULL) {
dev_err(iccom->dev, "[Err]Remap EICR failed\n");
ret = -ENOMEM;
} else {
iccom_comm->mfis_eicr_addr = (uint32_t *)remap_addr;
}
remap_addr = ioremap_nocache(
(uintptr_t)iccom_hw->mfis_imbr_addr, ICCOM_MFIS_LEN);
if (remap_addr == NULL) {
dev_err(iccom->dev, "[Err]Remap IMBR failed\n");
ret = -ENOMEM;
} else {
iccom_comm->mfis_imbr_addr = (uint32_t *)remap_addr;
}
remap_addr = ioremap_nocache(
(uintptr_t)iccom_hw->mfis_embr_addr, ICCOM_MFIS_LEN);
if (remap_addr == NULL) {
dev_err(iccom->dev, "[Err]Remap EMBR failed\n");
ret = -ENOMEM;
} else {
iccom_comm->mfis_embr_addr = (uint32_t *)remap_addr;
}
remap_addr = ioremap_nocache((uintptr_t)iccom_hw->cta_addr,
iccom_hw->cta_size);
if (remap_addr == NULL) {
dev_err(iccom->dev, "[Err]Remap CTA failed\n");
ret = -ENOMEM;
} else {
iccom_comm->cta_addr = (uint8_t *)remap_addr;
}
}
if (ret == ICCOM_OK) {
dev_dbg(iccom->dev, "flg check: 0x%X\n",
(iccom->flg & ICCOM_FLG_CH_INIT_END));
if ((iccom->flg & ICCOM_FLG_CH_INIT_END) == 0U) {
write_iicr =
(ICCOM_CTRL_INIT_END | ICCOM_CTRL_INT);
iowrite32(write_iicr,
iccom_comm->mfis_iicr_addr);
mutex_lock(&iccom_comm->mutex_poll_intbit);
ret = iccom_drv_poll_int_clear(
iccom_comm->mfis_iicr_addr,
iccom_hw->trg_timeout);
mutex_unlock(&iccom_comm->mutex_poll_intbit);
if (ret == ICCOM_OK) {
iccom->flg |= ICCOM_FLG_CH_INIT_END;
} else {
ret = -EDEADLK;
dev_err(iccom->dev,
"[Err] Channel init EDEADLK\n");
}
}
}
if (ret == ICCOM_OK) {
*channel_out = l_channel;
iccom->channel = l_channel;
/*
* Discard the interrupt received prior to the
* open process is completed.
*/
copy_eicr = ioread32(iccom_comm->mfis_eicr_addr);
iowrite32((copy_eicr & ICCOM_CTRL_CLEAR_INIT_BIT),
iccom_comm->mfis_eicr_addr);
enable_irq(iccom_hw->irq_no);
dev_dbg(iccom->dev, "iccom_communication_info\n");
dev_dbg(iccom->dev, "mfis_iicr_addr = %p\n",
iccom_comm->mfis_iicr_addr);
dev_dbg(iccom->dev, "mfis_eicr_addr = %p\n",
iccom_comm->mfis_eicr_addr);
dev_dbg(iccom->dev, "mfis_imbr_addr = %p\n",
iccom_comm->mfis_imbr_addr);
dev_dbg(iccom->dev, "mfis_embr_addr = %p\n",
iccom_comm->mfis_embr_addr);
dev_dbg(iccom->dev, "cta_addr = %p\n", iccom_comm->cta_addr);
} else {
if (ret != -EBUSY) {
mutex_lock(&iccom->mutex_channel_open);
iccom->flg &= ~ICCOM_FLG_CH_OPEN;
mutex_unlock(&iccom->mutex_channel_open);
if (l_channel != NULL) {
iccom_drv_release_channel(l_channel);
}
}
}
dev_dbg(iccom->dev, "%s: End ret = %d\n", __func__, ret);
return ret;
}
static ssize_t iccom_drv_read(struct iccom_channel *channel,
struct iccom_cmd *cmd)
{
struct iccom_communication_info *iccom_comm;
int32_t ret_poll;
uint32_t set_info;
enum iccom_cta_area cta_sw;
int32_t err_wait;
uintptr_t irq_flg = 0UL;
ssize_t ret = ICCOM_OK;
uint8_t *tgt_addr;
int64_t ret_cpy = 0;
int32_t ret_access;
uint32_t recv_i;
pr_debug("%s: Start\n", __func__);
iccom_comm = (struct iccom_communication_info *)channel->priv;
if (iccom_comm->read_status == ICCOM_READ_STATE_SEND_ACK) {
pr_debug("Send ACK\n");
cta_sw = iccom_comm->recv_index[0];
set_info = (cta_sw << ICCOM_SHIFT_SET_ACK_AREA);
set_info |= ICCOM_CTRL_INT;
/* Organize MFIS information */
spin_lock_irqsave(&iccom_comm->spinlock_mfis_info, irq_flg);
for (recv_i = 0U; recv_i < (ICCOM_CTA_RBUF_NUM - 1); recv_i++) {
iccom_comm->recv_index[recv_i] =
iccom_comm->recv_index[recv_i + 1U];
}
iccom_comm->data_arrive--;
spin_unlock_irqrestore(&iccom_comm->spinlock_mfis_info,
irq_flg);
ret_poll = iccom_drv_write_mfis(channel, set_info,
iccom_comm->recv_embr[cta_sw]);
if (ret_poll != ICCOM_OK) {
iccom_comm->read_status = ICCOM_READ_STATE_WAIT_READ;
ret = -EDEADLK;
dev_err(channel->iccom->dev, "[Err]Send Ack failed\n");
}
}
if (ret == ICCOM_OK) {
if (iccom_comm->data_arrive == 0U) {
iccom_comm->read_status = ICCOM_READ_STATE_RECEIVING;
}
pr_debug("Wait read\n");
err_wait = wait_event_interruptible(iccom_comm->read_q,
((iccom_comm->data_arrive >= 1) ||
iccom_comm->close_flg == 1));
if (err_wait < 0) {
ret = -EINTR;
} else if (iccom_comm->data_arrive == 0) {
pr_debug("read close flg = %d\n",
iccom_comm->close_flg);
/* Iccom_lib_Final() is called and all ACK is sended. */
iccom_comm->close_flg = 2;
wake_up_interruptible(&iccom_comm->ioctl_q);
ret = -ECANCELED;
} else {
cta_sw = iccom_comm->recv_index[0];
cmd->count = iccom_comm->recv_embr[cta_sw];
tgt_addr = (iccom_comm->cta_addr +
((cta_sw + ICCOM_CTA_SBUF_NUM) *
ICCOM_BUF_MAX_SIZE));
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 0, 0)
ret_access = access_ok(cmd->buf, cmd->count);
#else
ret_access = access_ok(VERIFY_WRITE, cmd->buf,
cmd->count);
#endif
if (ret_access != 0) {
dev_dbg(channel->iccom->dev,
"copy_to_user route\n");
ret_cpy = copy_to_user(cmd->buf, tgt_addr,
cmd->count);
} else {
dev_dbg(channel->iccom->dev,
"memcpy route\n");
memcpy_fromio(cmd->buf, tgt_addr, cmd->count);
}
if (ret_cpy == 0) {
iccom_comm->read_status =
ICCOM_READ_STATE_SEND_ACK;
ret = cmd->count;
}
}
}
pr_debug("%s: End ret = %zd\n", __func__, ret);
return ret;
}
static ssize_t iccom_drv_write(struct iccom_channel *channel,
struct iccom_cmd *cmd)
{
struct iccom_communication_info *iccom_comm;
struct iccom_hardware_info *iccom_hw;
int32_t ret_pall;
enum iccom_cta_area cta_sw = ICCOM_CTA_UPPER;
uint32_t mfis_set_info;
int32_t err;
ssize_t ret = 0;
int64_t ret_cpy = 0;
uint8_t *tgt_addr;
enum iccom_cta_area snd_area;
uintptr_t irq_flg = 0UL;
pr_debug("%s: Start cmd->cnt = %zd\n", __func__, cmd->count);
iccom_comm = (struct iccom_communication_info *)channel->priv;
iccom_hw = (struct iccom_hardware_info *)channel->iccom->priv;
if (down_trylock(&iccom_comm->sem_send_cta) != 0) {
pr_err("[Err]No CTA semaphore\n");
ret = -ENOSPC;
} else {
spin_lock_irqsave(&iccom_comm->spinlock_cta_flg, irq_flg);
for (snd_area = 0; snd_area < ICCOM_CTA_COUNT; snd_area++) {
if ((iccom_comm->cta_flg[snd_area] == 0U) &&
(iccom_comm->write_status[snd_area] ==
ICCOM_WRITE_STATE_WAIT_WRITE)) {
cta_sw = snd_area;
iccom_comm->cta_flg[cta_sw] = 1U;
break;
}
}
spin_unlock_irqrestore(&iccom_comm->spinlock_cta_flg, irq_flg);
if (snd_area >= ICCOM_CTA_COUNT) {
pr_err("[Err]CTA area is all used\n");
ret = -ENOSPC;
} else {
pr_debug("CTA%d write\n", cta_sw);
tgt_addr = (iccom_comm->cta_addr +
(cta_sw * ICCOM_BUF_MAX_SIZE));
dev_dbg(channel->iccom->dev,
"memcpy_toio : "
"tgt_addr = %p, buf = %p,"
" count = %lu\n", (void *)tgt_addr,
(void *)cmd->buf, cmd->count);
memcpy_toio(tgt_addr, cmd->buf, cmd->count);
if (ret_cpy == 0) {
dev_dbg(channel->iccom->dev, "Write success\n");
mfis_set_info = ((cta_sw
<< ICCOM_SHIFT_SET_SEND_AREA)
| (ICCOM_CTRL_INT
| ICCOM_CTRL_SND_ACK));
pr_debug("mfis set info :0x%X\n",
mfis_set_info);
iccom_comm->ack_arrive[cta_sw] = 0U;
iccom_comm->write_status[cta_sw] =
ICCOM_WRITE_STATE_RECV_ACK;
ret_pall = iccom_drv_write_mfis(channel,
mfis_set_info, cmd->count);
if (ret_pall != ICCOM_OK) {
dev_err(channel->iccom->dev,
"[Err]Write EDEADLK\n");
spin_lock_irqsave(
&iccom_comm->spinlock_cta_flg,
irq_flg);
iccom_comm->cta_flg[cta_sw] = 0U;
spin_unlock_irqrestore(
&iccom_comm->spinlock_cta_flg,
irq_flg);
ret = -EDEADLK;
} else {
pr_debug("Wait ack\n");
err = wait_event_interruptible_timeout(
iccom_comm->write_q,
(iccom_comm->ack_arrive[cta_sw]
== 1),
iccom_hw->ack_timeout_jf);
if (err == 0) {
ret = -ETIMEDOUT;
} else if (err < 0) {
ret = -EINTR;
} else {
ret
= iccom_comm->ack_embr[cta_sw];
}
}
iccom_comm->write_status[cta_sw] =
ICCOM_WRITE_STATE_WAIT_WRITE;
} else {
spin_lock_irqsave(&iccom_comm->spinlock_cta_flg,
irq_flg);
iccom_comm->cta_flg[cta_sw] = 0U;
spin_unlock_irqrestore(
&iccom_comm->spinlock_cta_flg,
irq_flg);
}
}
up(&iccom_comm->sem_send_cta);
}
pr_debug("%s: End ret = %zd\n", __func__, ret);
return ret;
}
static int32_t iccom_drv_ioctl(struct iccom_channel *channel,
int32_t req, void *arg)
{
int32_t ret = 0;
struct iccom_communication_info *iccom_comm;
struct iccom_hardware_info *iccom_hw;
int32_t err_wait;
pr_debug("%s: Start\n", __func__);
iccom_comm = (struct iccom_communication_info *)channel->priv;
iccom_hw = (struct iccom_hardware_info *)channel->iccom->priv;
switch (req) {
case ICCOM_IOC_CANCEL_RECEIVE:
disable_irq(iccom_hw->irq_no);
iccom_comm->close_flg = 1;
wake_up_interruptible(&iccom_comm->read_q);
/* Wait ACK send finish or trg timeout */
err_wait = wait_event_interruptible_timeout(
iccom_comm->ioctl_q,
(iccom_comm->close_flg == 2),
iccom_hw->trg_timeout);
if (err_wait == 0) {
pr_err("[Err]Wait all ACK send failed.\n");
ret = -ETIMEDOUT;
}
break;
default:
ret = -EINVAL;
pr_err("[Err]Invalid argument. req=%d\n", req);
break;
}
pr_debug("%s: End ret = %d\n", __func__, ret);
return ret;
}
static int32_t iccom_drv_close(struct iccom_channel *channel)
{
struct iccom *l_iccom;
struct iccom_communication_info *iccom_comm;
struct iccom_hardware_info *iccom_hw;
uintptr_t irq_flg = 0UL;
pr_debug("%s: Start\n", __func__);
l_iccom = channel->iccom;
iccom_comm = (struct iccom_communication_info *)channel->priv;
iccom_hw = (struct iccom_hardware_info *)l_iccom->priv;
if (iccom_comm->close_flg == 0) {
pr_debug("%s: disable_irq exec . iccom_comm->close_flg = %u\n",
__func__, iccom_comm->close_flg);
/* Process finalize but not call Iccom_lib_Final(). */
disable_irq(iccom_hw->irq_no);
}
spin_lock_irqsave(&iccom_comm->spinlock_mfis_info, irq_flg);
(void)memset(&iccom_comm->recv_index, 0,
sizeof(iccom_comm->recv_index));
(void)memset(&iccom_comm->recv_embr, 0, sizeof(iccom_comm->recv_embr));
iccom_comm->data_arrive = 0;
spin_unlock_irqrestore(&iccom_comm->spinlock_mfis_info, irq_flg);
wake_up_interruptible(&iccom_comm->read_q);
l_iccom->channel = NULL;
iccom_drv_release_channel(channel);
l_iccom->flg &= ~ICCOM_FLG_CH_OPEN;
pr_debug("%s: End\n", __func__);
return ICCOM_OK;
}
/* Interrupt handler */
static irqreturn_t iccom_drv_isr(int irq, void *dev_id)
{
uint32_t mfis_ctrl;
uint32_t mfis_msg;
enum iccom_cta_area cta_sw;
uint32_t snd_ack_flg;
struct iccom_communication_info *iccom_comm = NULL;
struct iccom_channel *l_channel;
struct iccom *l_iccom;
uintptr_t irq_flg = 0UL;
pr_debug("%s: Start\n", __func__);
disable_irq_nosync(irq);
l_iccom = (struct iccom *)dev_id;
l_channel = l_iccom->channel;
/*
* If the close function is called by the present function after
* it has been called, to check here for iccom_channel there is a
* possibility of NULL
*/
if (l_channel != NULL) {
iccom_comm = (struct iccom_communication_info *)l_channel->priv;
}
/*
* If the close function is called by the present function after
* it has been called, to check here for iccom_communication_info
* there is a possibility of NULL
*/
if (iccom_comm != NULL) {
mfis_ctrl = ioread32(iccom_comm->mfis_eicr_addr);
pr_debug("mfis ctrl :0x%X\n", mfis_ctrl);
snd_ack_flg = mfis_ctrl & ICCOM_CTRL_SND_ACK;
mfis_msg = ioread32(iccom_comm->mfis_embr_addr);
if (snd_ack_flg == 0U) {
cta_sw = (mfis_ctrl & ICCOM_CTRL_ACK_BUFF)
>> ICCOM_SHIFT_GET_ACK_AREA;
pr_debug("Recv Ack\n");
/* Check target message is not timeout. */
spin_lock_irqsave(&iccom_comm->spinlock_cta_flg,
irq_flg);
iccom_comm->cta_flg[cta_sw] = 0U;
spin_unlock_irqrestore(&iccom_comm->spinlock_cta_flg,
irq_flg);
if (iccom_comm->write_status[cta_sw]
== ICCOM_WRITE_STATE_RECV_ACK) {
iccom_comm->ack_arrive[cta_sw] = 1U;
iccom_comm->ack_embr[cta_sw] = mfis_msg;
wake_up_interruptible(
&iccom_comm->write_q);
} else {
pr_err("[Err]No wait Area \n");
}
} else {
cta_sw = (mfis_ctrl & ICCOM_CTRL_SND_BUFF)
>> ICCOM_SHIFT_GET_RECV_AREA;
pr_debug("Recv Msg\n");
/* Check receiving message rule. */
if (iccom_comm->data_arrive < ICCOM_CTA_RBUF_NUM) {
/* Save MFIS info */
spin_lock_irqsave(
&iccom_comm->spinlock_mfis_info,
irq_flg);
iccom_comm->recv_index[iccom_comm->data_arrive]
= cta_sw;
iccom_comm->data_arrive++;
spin_unlock_irqrestore(
&iccom_comm->spinlock_mfis_info,
irq_flg);
iccom_comm->recv_eicr[cta_sw] = mfis_ctrl;
iccom_comm->recv_embr[cta_sw] = mfis_msg;
wake_up_interruptible(&iccom_comm->read_q);
}
}
iowrite32((mfis_ctrl & ICCOM_CTRL_CLEAR_INIT_BIT),
iccom_comm->mfis_eicr_addr);
}
enable_irq(irq);
pr_debug("%s: End\n", __func__);
return IRQ_HANDLED;
}
const struct iccom_ops iccom_drv_fops = {
.owner = THIS_MODULE,
.open = &iccom_drv_open,
.read = &iccom_drv_read,
.write = &iccom_drv_write,
.ioctl = &iccom_drv_ioctl,
.close = &iccom_drv_close,
};
static const struct of_device_id iccom_drv_match[] = {
{ .compatible = "renesas,iccom-rcar", },
{ }
};
MODULE_DEVICE_TABLE(of, iccom_drv_match);
static int32_t iccom_drv_probe(struct platform_device *pdev)
{
struct iccom *l_iccom = NULL;
struct iccom_hardware_info *iccom_hw = NULL;
struct resource mfis_base;
struct resource *req_iicr;
struct resource *req_eicr;
struct resource *req_imbr;
struct resource *req_embr;
struct resource *req_cta;
int32_t ret = ICCOM_OK;
int32_t ret_irq;
int32_t ret_get_irq;
const void *reg_offset_ptr;
const void *cta_addr_ptr;
const void *ack_timer_ptr;
const void *trg_timer_ptr;
struct device_node *dev_node;
int8_t channel_name[ICCOM_CANNEL_NO_LEN];
int32_t len;
enum Iccom_channel_number i;
enum Iccom_channel_number l_channel_no = ICCOM_CHANNEL_MAX;
size_t fixed_len;
uint8_t request_flg = 0U;
int32_t ret_cmp;
pr_debug("%s: Start\n", __func__);
dev_node = dev_of_node(&pdev->dev);
if (dev_node != NULL) {
fixed_len = strlen(dev_node->name);
for (i = ICCOM_CHANNEL_0; i < ICCOM_CHANNEL_MAX; i++) {
(void)snprintf(channel_name, ICCOM_CANNEL_NO_LEN,
"%d", i);
ret_cmp = strncmp(&dev_node->name[fixed_len - 1U],
channel_name, strlen(channel_name));
if (ret_cmp == 0) {
l_channel_no = i;
break;
}
}
if (i >= ICCOM_CHANNEL_MAX) {
ret = -ENODEV;
dev_err(&pdev->dev, "Get Channel No failed\n");
}
if (ret == ICCOM_OK) {
l_iccom = iccom_core_alloc(&pdev->dev,
(int32_t)l_channel_no,
&iccom_drv_fops,
sizeof(*iccom_hw));
if (l_iccom == NULL) {
ret = -ENOMEM;
pr_err("[Err]iccom_core_alloc err\n");
}
}
if (ret == ICCOM_OK) {
iccom_hw =
(struct iccom_hardware_info *)l_iccom->priv;
ret_get_irq = platform_get_irq(pdev, 0U);
if (ret_get_irq <= 0) {
ret = ret_get_irq;
pr_err("[Err]Get_irq err\n");
} else {
iccom_hw->irq_no = (uint32_t)ret_get_irq;
}
}
if (ret == ICCOM_OK) {
ret = of_address_to_resource(dev_node, 0, &mfis_base);
if (ret != 0) {
dev_err(l_iccom->dev,
"Get MFIS base failed\n");
}
}
if (ret == ICCOM_OK) {
reg_offset_ptr = of_get_property(dev_node,
"iccom,reg-offset",
&len);
if ((reg_offset_ptr == NULL) ||
(len < ICCOM_REG_OFFSET_LEN)) {
ret = -ENODEV;
dev_err(l_iccom->dev,
"No defined reg_offset\n");
}
cta_addr_ptr = of_get_property(dev_node,
"iccom,cta-memory",
&len);
if ((cta_addr_ptr == NULL) ||
(len < ICCOM_CTA_MEMORY_LEN)) {
ret = -ENODEV;
dev_err(l_iccom->dev,
"No defined cta_memory\n");
}
ack_timer_ptr = of_get_property(dev_node,
"iccom,ack-timeout",
NULL);
if (ack_timer_ptr == NULL) {
ret = -ENODEV;
dev_err(l_iccom->dev,
"No defined ack_timeout\n");
}
trg_timer_ptr = of_get_property(dev_node,
"iccom,trg-timeout",
NULL);
if (trg_timer_ptr == NULL) {
ret = -ENODEV;
dev_err(l_iccom->dev,
"No defined trg_timeout\n");
}
}
if (ret == ICCOM_OK) {
iccom_hw->mfis_iicr_addr =
mfis_base.start + be32_to_cpup(reg_offset_ptr);
iccom_hw->mfis_eicr_addr =
mfis_base.start +
be32_to_cpup(reg_offset_ptr + 4);
iccom_hw->mfis_imbr_addr =
mfis_base.start +
be32_to_cpup(reg_offset_ptr + 8);
iccom_hw->mfis_embr_addr =
mfis_base.start +
be32_to_cpup(reg_offset_ptr + 12);
iccom_hw->cta_addr = be32_to_cpup(cta_addr_ptr + 4);
iccom_hw->cta_size = be32_to_cpup(cta_addr_ptr + 12);
iccom_hw->trg_timeout = be32_to_cpup(trg_timer_ptr);
iccom_hw->ack_timeout_jf =
msecs_to_jiffies(
be32_to_cpup(ack_timer_ptr));
ret_irq = request_irq(iccom_hw->irq_no,
(irq_handler_t)&iccom_drv_isr,
IRQF_PROBE_SHARED,
l_iccom->name,
(void *)l_iccom);
if (ret_irq != 0) {
ret = -ENODEV;
dev_err(l_iccom->dev, "SAME IRQ registered\n");
} else {
request_flg |= ICCOM_REQUEST_IRQ;
disable_irq_nosync(iccom_hw->irq_no);
}
req_iicr = request_mem_region(
(uintptr_t)iccom_hw->mfis_iicr_addr,
ICCOM_MFIS_LEN, l_iccom->name);
if (req_iicr == NULL) {
ret = -ENODEV;
dev_err(l_iccom->dev, "Overlap IICR\n");
} else {
request_flg |= ICCOM_REQUEST_IICR;
}
req_eicr = request_mem_region(
(uintptr_t)iccom_hw->mfis_eicr_addr,
ICCOM_MFIS_LEN, l_iccom->name);
if (req_eicr == NULL) {
ret = -ENODEV;
dev_err(l_iccom->dev, "Overlap EICR\n");
} else {
request_flg |= ICCOM_REQUEST_EICR;
}
req_imbr = request_mem_region(
(uintptr_t)iccom_hw->mfis_imbr_addr,
ICCOM_MFIS_LEN, l_iccom->name);
if (req_imbr == NULL) {
ret = -ENODEV;
dev_err(l_iccom->dev, "Overlap IMBR\n");
} else {
request_flg |= ICCOM_REQUEST_IMBR;
}
req_embr = request_mem_region(
(uintptr_t)iccom_hw->mfis_embr_addr,
ICCOM_MFIS_LEN, l_iccom->name);
if (req_embr == NULL) {
ret = -ENODEV;
dev_err(l_iccom->dev, "Overlap EMBR\n");
} else {
request_flg |= ICCOM_REQUEST_EMBR;
}
req_cta = request_mem_region(
(uintptr_t)iccom_hw->cta_addr,
(uintptr_t)iccom_hw->cta_size,
l_iccom->name);
if (req_cta == NULL) {
ret = -ENODEV;
dev_err(&pdev->dev, "Overlap CTA\n");
} else {
request_flg |= ICCOM_REQUEST_CTA;
}
}
if (ret == ICCOM_OK) {
ret = iccom_core_add(l_iccom);
}
if (ret == ICCOM_OK) {
platform_set_drvdata(pdev, l_iccom);
pr_info("ICCOM Channel%d ready\n", l_channel_no);
pr_debug("Channel %d info\n", l_channel_no);
pr_debug("IRQ: 0x%X", iccom_hw->irq_no);
pr_debug("MFISARIICR: 0x%X\n",
iccom_hw->mfis_iicr_addr);
pr_debug("MFISAREICR: 0x%X\n",
iccom_hw->mfis_eicr_addr);
pr_debug("MFISARIMBR: 0x%X\n",
iccom_hw->mfis_imbr_addr);
pr_debug("MFISAREMBR: 0x%X\n",
iccom_hw->mfis_embr_addr);
pr_debug("CTA: 0x%X\n", iccom_hw->cta_addr);
pr_debug("ACK_TIMEOUT: %llu\n", iccom_hw->ack_timeout_jf);
pr_debug("TRG_TIMEOUT: %d\n", iccom_hw->trg_timeout);
} else {
if (l_iccom != NULL) {
iccom_drv_release_iccom(l_iccom, request_flg);
(void)iccom_core_free(l_iccom);
}
if (l_channel_no != ICCOM_CHANNEL_MAX) {
pr_err("[Err]channel %d not use\n",
l_channel_no);
}
}
} else {
/* No operation */
}
pr_debug("%s: End ret = %d\n", __func__, ret);
return ret;
}
static int32_t iccom_drv_remove(struct platform_device *pdev)
{
int32_t ret = ICCOM_OK;
struct iccom *l_iccom;
pr_debug("%s: Start\n", __func__);
l_iccom = platform_get_drvdata(pdev);
if (l_iccom != NULL) {
iccom_drv_release_iccom(l_iccom, ICCOM_REQUEST_ALL);
ret = iccom_core_del(l_iccom);
}
pr_debug("%s: End ret = %d\n", __func__, ret);
return ret;
}
static struct platform_driver iccom_driver = {
.probe = &iccom_drv_probe,
.remove = __exit_p(iccom_drv_remove),
.driver = {
.name = "iccom",
.owner = THIS_MODULE,
.of_match_table = iccom_drv_match,
},
};
static struct platform_device iccom_device = {
.name = "iccom",
.id = 0,
.dev = {
.release = &iccom_drv_device_release
},
};
static __init int32_t iccom_drv_init(void)
{
int32_t ret;
pr_info("%s initialization(R-Car Rev.%s)\n",
ICCOM_MODULE_NAME, VERSION_OF_RENESAS);
pr_debug("%s: Start\n", __func__);
ret = platform_driver_register(&iccom_driver);
if (ret == 0) {
ret = platform_device_register(&iccom_device);
if (ret != 0) {
platform_driver_unregister(&iccom_driver);
}
}
pr_info("%s initialization finish\n", ICCOM_MODULE_NAME);
pr_debug("%s: End\n", __func__);
return ret;
}
static void __exit iccom_drv_exit(void)
{
pr_info("%s de-initialization\n", ICCOM_MODULE_NAME);
pr_debug("%s: Start\n", __func__);
platform_device_unregister(&iccom_device);
platform_driver_unregister(&iccom_driver);
pr_info("%s de-initialization finish\n", ICCOM_MODULE_NAME);
pr_debug("%s: End\n", __func__);
}
static void iccom_drv_device_release(struct device *dev)
{
pr_debug("%s: dev=%p\n", __func__, dev);
}
static void iccom_drv_release_channel(struct iccom_channel *channel)
{
struct iccom_communication_info *iccom_comm = NULL;