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Date: Mon, 15 Dec 2014 14:22:29 +0800
From: Ley Foon Tan <lftan@...era.com>
To: Dinh Nguyen <dinh.linux@...il.com>
Cc: Jassi Brar <jassisinghbrar@...il.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Suman Anna <s-anna@...com>, devicetree@...r.kernel.org
Subject: Re: [PATCH (resend)] mailbox: Add Altera mailbox driver
On Fri, Dec 12, 2014 at 10:38 PM, Dinh Nguyen <dinh.linux@...il.com> wrote:
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/device.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/of.h>
>> +#include <linux/mailbox_controller.h>
>
> Alphabetize the headers.
Okay.
>> +static int altera_mbox_startup_sender(struct mbox_chan *chan)
>> +{
>> + int ret;
>> + struct altera_mbox *mbox = to_altera_mbox(chan);
>> +
>> + if (mbox->intr_mode) {
>> + ret = request_irq(mbox->irq, altera_mbox_tx_interrupt, 0,
>
> Use devm_request_irq, since you didn't have and don't need use free_irq
> in the shutdown function.
We want to free_irq when it shutdown. That means nobody requests for
that mailbox (or channel) and request_irq() again if someone requests
for a mailbox.
>
>> + DRIVER_NAME, chan);
>> + if (unlikely(ret)) {
>> + dev_err(mbox->dev,
>> + "failed to register mailbox interrupt:%d\n",
>> + ret);
>> + return ret;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int altera_mbox_startup_receiver(struct mbox_chan *chan)
>> +{
>> + int ret;
>> + struct altera_mbox *mbox = to_altera_mbox(chan);
>> +
>> + if (mbox->intr_mode) {
>> + ret = request_irq(mbox->irq, altera_mbox_rx_interrupt, 0,
>> + DRIVER_NAME, chan);
>
> Use devm_request_irq
>
>
>> + if (unlikely(ret)) {
>> + dev_err(mbox->dev,
>> + "failed to register mailbox interrupt:%d\n",
>> + ret);
>> + return ret;
>> + }
>> + altera_mbox_rx_intmask(mbox, true);
>> + } else {
>> + /* Setup polling timer */
>> + setup_timer(&mbox->rxpoll_timer, altera_mbox_poll_rx,
>> + (unsigned long)chan);
>> + mod_timer(&mbox->rxpoll_timer,
>> + jiffies + msecs_to_jiffies(MBOX_POLLING_MS));
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int altera_mbox_send_data(struct mbox_chan *chan, void *data)
>> +{
>> + struct altera_mbox *mbox = to_altera_mbox(chan);
>> + u32 *udata = (u32 *)data;
>> +
>> + if (!mbox || !data)
>> + return -EINVAL;
>> + if (!mbox->is_sender) {
>> + dev_warn(mbox->dev,
>> + "failed to send. This is receiver mailbox.\n");
>> + return -EINVAL;
>> + }
>> +
>> + if (altera_mbox_full(mbox))
>> + return -EBUSY;
>> +
>> + /* Enable interrupt before send */
>> + altera_mbox_tx_intmask(mbox, true);
>> +
>> + /* Pointer register must write before command register */
>> + __raw_writel(udata[MBOX_PTR], mbox->mbox_base + MAILBOX_PTR_REG);
>> + __raw_writel(udata[MBOX_CMD], mbox->mbox_base + MAILBOX_CMD_REG);
>> +
>> + return 0;
>> +}
>> +
>> +static bool altera_mbox_last_tx_done(struct mbox_chan *chan)
>> +{
>> + struct altera_mbox *mbox = to_altera_mbox(chan);
>> +
>> + if (WARN_ON(!mbox))
>> + return false;
>
> Are these checks necessary? Shouldn't the driver probe function have
> already failed?
Will removed.
>> +
>> + /* Return false if mailbox is full */
>> + return altera_mbox_full(mbox) ? false : true;
>> +}
>> +
>> +static bool altera_mbox_peek_data(struct mbox_chan *chan)
>> +{
>> + struct altera_mbox *mbox = to_altera_mbox(chan);
>> +
>> + if (WARN_ON(!mbox))
>> + return false;
>> +
>> + return altera_mbox_pending(mbox) ? true : false;
>> +}
>> +
>> +static int altera_mbox_startup(struct mbox_chan *chan)
>> +{
>> + struct altera_mbox *mbox = to_altera_mbox(chan);
>> + int ret = 0;
>> +
>> + if (!mbox)
>> + return -EINVAL;
>> +
>> + if (mbox->is_sender)
>> + ret = altera_mbox_startup_sender(chan);
>> + else
>> + ret = altera_mbox_startup_receiver(chan);
>> +
>> + return ret;
>> +}
>> +
>> +static void altera_mbox_shutdown(struct mbox_chan *chan)
>> +{
>> + struct altera_mbox *mbox = to_altera_mbox(chan);
>> +
>> + if (WARN_ON(!mbox))
>> + return;
>> +
>> + if (mbox->intr_mode) {
>> + /* Unmask all interrupt masks */
>> + __raw_writel(~0, mbox->mbox_base + MAILBOX_INTMASK_REG);
>> + free_irq(mbox->irq, chan);
>> + } else if (!mbox->is_sender)
>> + del_timer_sync(&mbox->rxpoll_timer);
>
> Need braces around the else as well.
Noted.
>
>> +}
>> +
>> +static struct mbox_chan_ops altera_mbox_ops = {
>> + .send_data = altera_mbox_send_data,
>> + .startup = altera_mbox_startup,
>> + .shutdown = altera_mbox_shutdown,
>> + .last_tx_done = altera_mbox_last_tx_done,
>> + .peek_data = altera_mbox_peek_data,
>> +};
>> +
>> +static int altera_mbox_probe(struct platform_device *pdev)
>> +{
>> + struct altera_mbox *mbox;
>> + struct mbox_chan *chans[1];
>
> It would be cleaner if you use devm_kzalloc to allocate the channel here.
Okay.
>
>> + struct resource *regs;
>> + int ret;
>> +
>> + mbox = devm_kzalloc(&pdev->dev, sizeof(struct altera_mbox),
>> + GFP_KERNEL);
>> + if (!mbox)
>> + return -ENOMEM;
>> +
>> + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + if (!regs)
>> + return -ENXIO;
>> +
>> + mbox->mbox_base = devm_ioremap_resource(&pdev->dev, regs);
>> + if (IS_ERR(mbox->mbox_base))
>> + return PTR_ERR(mbox->mbox_base);
>> +
>> + /* Check is it a sender or receiver? */
>> + mbox->is_sender = altera_mbox_is_sender(mbox);
>> +
>> + mbox->irq = platform_get_irq(pdev, 0);
>> + if (mbox->irq >= 0)
>> + mbox->intr_mode = true;
>> +
>> + mbox->dev = &pdev->dev;
>> +
>> + /* Hardware supports only one channel. */
>> + chans[0] = &mbox->chan;
>> + mbox->controller.dev = mbox->dev;
>> + mbox->controller.num_chans = 1;
>> + mbox->controller.chans = &mbox->chan;
>> + mbox->controller.ops = &altera_mbox_ops;
>> +
>> + if (mbox->is_sender) {
>> + if (mbox->intr_mode)
>> + mbox->controller.txdone_irq = true;
>> + else {
>> + mbox->controller.txdone_poll = true;
>> + mbox->controller.txpoll_period = MBOX_POLLING_MS;
>> + }
>
> Need braces around the if as well.
Noted.
>
Regards
Ley Foon
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