linux-kernel - Re: [PATCH V3 2/5] mailbox: Add support for QTI CPUCP mailbox controller

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Message-ID: <CAA8EJpq93GO+DMovuNdk8B-PYBF72SGxVXT2nwRX5w9X7pC4vg@mail.gmail.com>
Date: Wed, 17 Apr 2024 21:27:54 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Sibi Sankar <quic_sibis@...cinc.com>
Cc: sudeep.holla@....com, cristian.marussi@....com, andersson@...nel.org, 
	konrad.dybcio@...aro.org, jassisinghbrar@...il.com, robh+dt@...nel.org, 
	krzysztof.kozlowski+dt@...aro.org, linux-kernel@...r.kernel.org, 
	linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org, 
	quic_rgottimu@...cinc.com, quic_kshivnan@...cinc.com, conor+dt@...nel.org, 
	quic_gkohli@...cinc.com, quic_nkela@...cinc.com, quic_psodagud@...cinc.com
Subject: Re: [PATCH V3 2/5] mailbox: Add support for QTI CPUCP mailbox controller

On Wed, 17 Apr 2024 at 16:29, Sibi Sankar <quic_sibis@...cinc.com> wrote:
>
> Add support for CPUSS Control Processor (CPUCP) mailbox controller,
> this driver enables communication between AP and CPUCP by acting as
> a doorbell between them.
>
> Signed-off-by: Sibi Sankar <quic_sibis@...cinc.com>
> ---
>
> v2:
> * Use BIT() instead of manual shift. [Dmitry]
> * Define RX_MBOX_CMD to account for chan calculation. [Dmitry]
> * Clear the bit instead of the entire status within the spinlock. [Dmitry]
> * Use dev_err_probe instead. [Dmitry]
> * Drop superfluous error message while handling errors from get_irq. [Dmitry]
> * Use devm_mbox_controller_register and drop remove path. [Dmitry]
> * Define TX_MBOX_CMD to account for chan calculation.
> * Use cpucp->dev in probe path for conformity.
>
>  drivers/mailbox/Kconfig           |   8 ++
>  drivers/mailbox/Makefile          |   2 +
>  drivers/mailbox/qcom-cpucp-mbox.c | 188 ++++++++++++++++++++++++++++++
>  3 files changed, 198 insertions(+)
>  create mode 100644 drivers/mailbox/qcom-cpucp-mbox.c
>
> diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
> index 42940108a187..23741a6f054e 100644
> --- a/drivers/mailbox/Kconfig
> +++ b/drivers/mailbox/Kconfig
> @@ -273,6 +273,14 @@ config SPRD_MBOX
>           to send message between application processors and MCU. Say Y here if
>           you want to build the Spreatrum mailbox controller driver.
>
> +config QCOM_CPUCP_MBOX
> +       tristate "Qualcomm Technologies, Inc. CPUCP mailbox driver"
> +       depends on ARCH_QCOM || COMPILE_TEST
> +       help
> +         Qualcomm Technologies, Inc. CPUSS Control Processor (CPUCP) mailbox
> +         controller driver enables communication between AP and CPUCP. Say
> +         Y here if you want to build this driver.
> +
>  config QCOM_IPCC
>         tristate "Qualcomm Technologies, Inc. IPCC driver"
>         depends on ARCH_QCOM || COMPILE_TEST
> diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
> index 18793e6caa2f..53b512800bde 100644
> --- a/drivers/mailbox/Makefile
> +++ b/drivers/mailbox/Makefile
> @@ -59,4 +59,6 @@ obj-$(CONFIG_SUN6I_MSGBOX)    += sun6i-msgbox.o
>
>  obj-$(CONFIG_SPRD_MBOX)                += sprd-mailbox.o
>
> +obj-$(CONFIG_QCOM_CPUCP_MBOX)  += qcom-cpucp-mbox.o
> +
>  obj-$(CONFIG_QCOM_IPCC)                += qcom-ipcc.o
> diff --git a/drivers/mailbox/qcom-cpucp-mbox.c b/drivers/mailbox/qcom-cpucp-mbox.c
> new file mode 100644
> index 000000000000..059eb25f217c
> --- /dev/null
> +++ b/drivers/mailbox/qcom-cpucp-mbox.c
> @@ -0,0 +1,188 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2024, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/platform_device.h>
> +#include <linux/mailbox_controller.h>
> +#include <linux/module.h>
> +
> +#define APSS_CPUCP_IPC_CHAN_SUPPORTED          3
> +#define APSS_CPUCP_MBOX_CMD_OFF                        0x4
> +
> +/* Tx Registers */
> +#define APSS_CPUCP_TX_MBOX_IDR                 0

I don't see _IDR defines being used.

Other than that:

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>


> +#define APSS_CPUCP_TX_MBOX_CMD(i)              (0x100 + ((i) * 8))
> +
> +/* Rx Registers */
> +#define APSS_CPUCP_RX_MBOX_IDR                 0
> +#define APSS_CPUCP_RX_MBOX_CMD(i)              (0x100 + ((i) * 8))
> +#define APSS_CPUCP_RX_MBOX_MAP                 0x4000
> +#define APSS_CPUCP_RX_MBOX_STAT                        0x4400
> +#define APSS_CPUCP_RX_MBOX_CLEAR               0x4800
> +#define APSS_CPUCP_RX_MBOX_EN                  0x4C00
> +#define APSS_CPUCP_RX_MBOX_CMD_MASK            0xFFFFFFFFFFFFFFFF


-- 
With best wishes
Dmitry