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Date: Thu, 21 Jun 2018 09:13:14 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: Mikko Perttunen <mperttunen@...dia.com>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <jassisinghbrar@...il.com>,
<gregkh@...uxfoundation.org>, <thierry.reding@...il.com>
CC: <devicetree@...r.kernel.org>, <linux-serial@...r.kernel.org>,
<linux-tegra@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/8] mailbox: tegra-hsp: Refactor in preparation of
mailboxes
On 20/06/18 13:20, Mikko Perttunen wrote:
> The HSP driver is currently in many places written with the assumption
> of only supporting doorbells. Prepare for the addition of shared
> mailbox support by removing these assumptions and cleaning up the code.
>
> Signed-off-by: Mikko Perttunen <mperttunen@...dia.com>
> ---
>
> Notes:
> v2:
> - Moved fixes for some style and other issues from the next patch
> here, where they belong.
>
> drivers/mailbox/tegra-hsp.c | 123 +++++++++++++++++++++++++++++---------------
> 1 file changed, 81 insertions(+), 42 deletions(-)
>
> diff --git a/drivers/mailbox/tegra-hsp.c b/drivers/mailbox/tegra-hsp.c
> index 0cde356c11ab..5dc21a6d01bb 100644
> --- a/drivers/mailbox/tegra-hsp.c
> +++ b/drivers/mailbox/tegra-hsp.c
> @@ -1,5 +1,5 @@
> /*
> - * Copyright (c) 2016, NVIDIA CORPORATION. All rights reserved.
> + * Copyright (c) 2016-2018, NVIDIA CORPORATION. All rights reserved.
> *
> * This program is free software; you can redistribute it and/or modify it
> * under the terms and conditions of the GNU General Public License,
> @@ -42,6 +42,7 @@ struct tegra_hsp_channel;
> struct tegra_hsp;
>
> struct tegra_hsp_channel {
> + unsigned int type;
> struct tegra_hsp *hsp;
> struct mbox_chan *chan;
> void __iomem *regs;
> @@ -55,6 +56,12 @@ struct tegra_hsp_doorbell {
> unsigned int index;
> };
>
> +static inline struct tegra_hsp_doorbell *
> +channel_to_doorbell(struct tegra_hsp_channel *channel)
> +{
> + return container_of(channel, struct tegra_hsp_doorbell, channel);
> +}
> +
> struct tegra_hsp_db_map {
> const char *name;
> unsigned int master;
> @@ -69,7 +76,7 @@ struct tegra_hsp {
> const struct tegra_hsp_soc *soc;
> struct mbox_controller mbox;
> void __iomem *regs;
> - unsigned int irq;
> + unsigned int doorbell_irq;
> unsigned int num_sm;
> unsigned int num_as;
> unsigned int num_ss;
> @@ -194,7 +201,7 @@ tegra_hsp_doorbell_create(struct tegra_hsp *hsp, const char *name,
> if (!db)
> return ERR_PTR(-ENOMEM);
>
> - offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) << 16;
> + offset = (1 + (hsp->num_sm / 2) + hsp->num_ss + hsp->num_as) * SZ_64K;
> offset += index * 0x100;
>
> db->channel.regs = hsp->regs + offset;
> @@ -218,18 +225,8 @@ static void __tegra_hsp_doorbell_destroy(struct tegra_hsp_doorbell *db)
> kfree(db);
> }
>
> -static int tegra_hsp_doorbell_send_data(struct mbox_chan *chan, void *data)
> -{
> - struct tegra_hsp_doorbell *db = chan->con_priv;
> -
> - tegra_hsp_channel_writel(&db->channel, 1, HSP_DB_TRIGGER);
> -
> - return 0;
> -}
> -
> -static int tegra_hsp_doorbell_startup(struct mbox_chan *chan)
> +static int tegra_hsp_doorbell_startup(struct tegra_hsp_doorbell *db)
> {
> - struct tegra_hsp_doorbell *db = chan->con_priv;
> struct tegra_hsp *hsp = db->channel.hsp;
> struct tegra_hsp_doorbell *ccplex;
> unsigned long flags;
> @@ -260,9 +257,8 @@ static int tegra_hsp_doorbell_startup(struct mbox_chan *chan)
> return 0;
> }
>
> -static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan)
> +static void tegra_hsp_doorbell_shutdown(struct tegra_hsp_doorbell *db)
> {
> - struct tegra_hsp_doorbell *db = chan->con_priv;
> struct tegra_hsp *hsp = db->channel.hsp;
> struct tegra_hsp_doorbell *ccplex;
> unsigned long flags;
> @@ -281,35 +277,60 @@ static void tegra_hsp_doorbell_shutdown(struct mbox_chan *chan)
> spin_unlock_irqrestore(&hsp->lock, flags);
> }
>
> -static const struct mbox_chan_ops tegra_hsp_doorbell_ops = {
> - .send_data = tegra_hsp_doorbell_send_data,
> - .startup = tegra_hsp_doorbell_startup,
> - .shutdown = tegra_hsp_doorbell_shutdown,
> +static int tegra_hsp_send_data(struct mbox_chan *chan, void *data)
> +{
> + struct tegra_hsp_channel *channel = chan->con_priv;
> +
> + switch (channel->type) {
> + case TEGRA_HSP_MBOX_TYPE_DB:
> + tegra_hsp_channel_writel(channel, 1, HSP_DB_TRIGGER);
> + return 0;
> + }
> +
> + return -EINVAL;
> +}
> +
> +static int tegra_hsp_startup(struct mbox_chan *chan)
> +{
> + struct tegra_hsp_channel *channel = chan->con_priv;
> +
> + switch (channel->type) {
> + case TEGRA_HSP_MBOX_TYPE_DB:
> + return tegra_hsp_doorbell_startup(channel_to_doorbell(channel));
> + }
> +
> + return -EINVAL;
> +}
> +
> +static void tegra_hsp_shutdown(struct mbox_chan *chan)
> +{
> + struct tegra_hsp_channel *channel = chan->con_priv;
> +
> + switch (channel->type) {
> + case TEGRA_HSP_MBOX_TYPE_DB:
> + tegra_hsp_doorbell_shutdown(channel_to_doorbell(channel));
> + break;
> + }
> +}
> +
> +static const struct mbox_chan_ops tegra_hsp_ops = {
> + .send_data = tegra_hsp_send_data,
> + .startup = tegra_hsp_startup,
> + .shutdown = tegra_hsp_shutdown,
> };
>
> -static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
> - const struct of_phandle_args *args)
> +static struct mbox_chan *tegra_hsp_doorbell_xlate(struct tegra_hsp *hsp,
> + unsigned int master)
> {
> struct tegra_hsp_channel *channel = ERR_PTR(-ENODEV);
> - struct tegra_hsp *hsp = to_tegra_hsp(mbox);
> - unsigned int type = args->args[0];
> - unsigned int master = args->args[1];
> struct tegra_hsp_doorbell *db;
> struct mbox_chan *chan;
> unsigned long flags;
> unsigned int i;
>
> - switch (type) {
> - case TEGRA_HSP_MBOX_TYPE_DB:
> - db = tegra_hsp_doorbell_get(hsp, master);
> - if (db)
> - channel = &db->channel;
> -
> - break;
> -
> - default:
> - break;
> - }
> + db = tegra_hsp_doorbell_get(hsp, master);
> + if (db)
> + channel = &db->channel;
>
> if (IS_ERR(channel))
> return ERR_CAST(channel);
> @@ -321,6 +342,7 @@ static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
> if (!chan->con_priv) {
> chan->con_priv = channel;
> channel->chan = chan;
> + channel->type = TEGRA_HSP_MBOX_TYPE_DB;
> break;
> }
>
> @@ -332,6 +354,22 @@ static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
> return chan ?: ERR_PTR(-EBUSY);
> }
>
> +static struct mbox_chan *of_tegra_hsp_xlate(struct mbox_controller *mbox,
> + const struct of_phandle_args *args)
> +{
> + struct tegra_hsp *hsp = to_tegra_hsp(mbox);
> + unsigned int type = args->args[0];
> + unsigned int param = args->args[1];
> +
> + switch (type) {
> + case TEGRA_HSP_MBOX_TYPE_DB:
> + return tegra_hsp_doorbell_xlate(hsp, param);
> +
> + default:
> + return ERR_PTR(-EINVAL);
> + }
> +}
> +
> static void tegra_hsp_remove_doorbells(struct tegra_hsp *hsp)
> {
> struct tegra_hsp_doorbell *db, *tmp;
> @@ -397,14 +435,14 @@ static int tegra_hsp_probe(struct platform_device *pdev)
> return err;
> }
>
> - hsp->irq = err;
> + hsp->doorbell_irq = err;
>
> hsp->mbox.of_xlate = of_tegra_hsp_xlate;
> hsp->mbox.num_chans = 32;
> hsp->mbox.dev = &pdev->dev;
> hsp->mbox.txdone_irq = false;
> hsp->mbox.txdone_poll = false;
> - hsp->mbox.ops = &tegra_hsp_doorbell_ops;
> + hsp->mbox.ops = &tegra_hsp_ops;
>
> hsp->mbox.chans = devm_kcalloc(&pdev->dev, hsp->mbox.num_chans,
> sizeof(*hsp->mbox.chans),
> @@ -427,11 +465,12 @@ static int tegra_hsp_probe(struct platform_device *pdev)
> return err;
> }
>
> - err = devm_request_irq(&pdev->dev, hsp->irq, tegra_hsp_doorbell_irq,
> - IRQF_NO_SUSPEND, dev_name(&pdev->dev), hsp);
> + err = devm_request_irq(&pdev->dev, hsp->doorbell_irq,
> + tegra_hsp_doorbell_irq, IRQF_NO_SUSPEND,
> + dev_name(&pdev->dev), hsp);
> if (err < 0) {
> - dev_err(&pdev->dev, "failed to request IRQ#%u: %d\n",
> - hsp->irq, err);
> + dev_err(&pdev->dev, "failed to request doorbell IRQ#%u: %d\n",
> + hsp->doorbell_irq, err);
> return err;
> }
Reviewed-by: Jon Hunter <jonathanh@...dia.com>
Cheers
Jon
--
nvpublic
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