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Date: Mon, 20 Jun 2016 12:20:01 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Bjorn Andersson <bjorn.andersson@...aro.org>,
Andy Gross <andy.gross@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>,
Stephen Boyd <sboyd@...eaurora.org>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org
Subject: Re: [PATCH v2] firmware: qcom: scm: Expose PAS command 10 as
reset-controller
On 17/06/16 18:40, Bjorn Andersson wrote:
> PAS command 10 is used to assert and deassert the MSS reset via
> TrustZone, expose this as a reset-controller to mimic the direct
> access case.
>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Acked-by: Rob Herring <robh@...nel.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
> ---
Good stuff!
Acked-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
>
> Changes since v1:
> - Selecting RESET_CONTROLLER
> - Constifying reset_ops
>
> drivers/firmware/Kconfig | 1 +
> drivers/firmware/qcom_scm-32.c | 13 +++++++++++++
> drivers/firmware/qcom_scm-64.c | 14 ++++++++++++++
> drivers/firmware/qcom_scm.c | 30 ++++++++++++++++++++++++++++++
> drivers/firmware/qcom_scm.h | 2 ++
> 5 files changed, 60 insertions(+)
>
> diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
> index 6664f1108c7c..5e618058defe 100644
> --- a/drivers/firmware/Kconfig
> +++ b/drivers/firmware/Kconfig
> @@ -184,6 +184,7 @@ config FW_CFG_SYSFS_CMDLINE
> config QCOM_SCM
> bool
> depends on ARM || ARM64
> + select RESET_CONTROLLER
>
> config QCOM_SCM_32
> def_bool y
> diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
> index 3df3798729c3..cf731b3452f3 100644
> --- a/drivers/firmware/qcom_scm-32.c
> +++ b/drivers/firmware/qcom_scm-32.c
> @@ -564,3 +564,16 @@ int __qcom_scm_pas_shutdown(u32 peripheral)
>
> return ret ? : le32_to_cpu(out);
> }
> +
> +int __qcom_scm_pas_mss_reset(bool reset)
> +{
> + __le32 out;
> + __le32 in = cpu_to_le32(reset);
> + int ret;
> +
> + ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_MSS_RESET,
> + &in, sizeof(in),
> + &out, sizeof(out));
> +
> + return ret ? : le32_to_cpu(out);
> +}
> diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c
> index 72c2f81b8fd3..45ee872b6e6d 100644
> --- a/drivers/firmware/qcom_scm-64.c
> +++ b/drivers/firmware/qcom_scm-64.c
> @@ -565,6 +565,20 @@ int __qcom_scm_pas_shutdown(u32 peripheral)
> return ret ? : scm_ret;
> }
>
> +int __qcom_scm_pas_mss_reset(bool reset)
> +{
> + struct qcom_scm_desc desc = {0};
> + int ret;
> +
> + desc.args[0] = reset;
> + desc.args[1] = 0;
> + desc.arginfo = QCOM_SCM_ARGS(2);
> +
> + ret = qcom_scm_call(QCOM_SCM_SVC_PIL, QCOM_SCM_PAS_MSS_RESET, &desc);
> +
> + return ret ? : desc.ret[0];
> +}
> +
> int __qcom_scm_pil_init_image_cmd(u32 proc, u64 image_addr)
> {
> struct qcom_scm_desc desc = {0};
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index 6fc9580a26bd..bfa9bfd9a62c 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -20,6 +20,7 @@
> #include <linux/qcom_scm.h>
> #include <linux/of.h>
> #include <linux/clk.h>
> +#include <linux/reset-controller.h>
>
> #include "qcom_scm.h"
>
> @@ -28,6 +29,7 @@ struct qcom_scm {
> struct clk *core_clk;
> struct clk *iface_clk;
> struct clk *bus_clk;
> + struct reset_controller_dev reset;
> };
>
> static struct qcom_scm *__scm;
> @@ -280,6 +282,29 @@ int qcom_scm_pas_shutdown(u32 peripheral)
> }
> EXPORT_SYMBOL(qcom_scm_pas_shutdown);
>
> +static int qcom_scm_pas_reset_assert(struct reset_controller_dev *rcdev,
> + unsigned long idx)
> +{
> + if (idx != 0)
> + return -EINVAL;
> +
> + return __qcom_scm_pas_mss_reset(1);
> +}
> +
> +static int qcom_scm_pas_reset_deassert(struct reset_controller_dev *rcdev,
> + unsigned long idx)
> +{
> + if (idx != 0)
> + return -EINVAL;
> +
> + return __qcom_scm_pas_mss_reset(0);
> +}
> +
> +static const struct reset_control_ops qcom_scm_pas_reset_ops = {
> + .assert = qcom_scm_pas_reset_assert,
> + .deassert = qcom_scm_pas_reset_deassert,
> +};
> +
> /**
> * qcom_scm_is_available() - Checks if SCM is available
> */
> @@ -322,6 +347,11 @@ static int qcom_scm_probe(struct platform_device *pdev)
> return PTR_ERR(scm->bus_clk);
> }
>
> + scm->reset.ops = &qcom_scm_pas_reset_ops;
> + scm->reset.nr_resets = 1;
> + scm->reset.of_node = pdev->dev.of_node;
> + reset_controller_register(&scm->reset);
> +
> /* vote for max clk rate for highest performance */
> rate = clk_round_rate(scm->core_clk, INT_MAX);
> ret = clk_set_rate(scm->core_clk, rate);
> diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
> index 8f1207fca771..80752cbfd139 100644
> --- a/drivers/firmware/qcom_scm.h
> +++ b/drivers/firmware/qcom_scm.h
> @@ -44,11 +44,13 @@ extern int __qcom_scm_hdcp_req(struct qcom_scm_hdcp_req *req, u32 req_cnt,
> #define QCOM_SCM_PAS_AUTH_AND_RESET_CMD 0x5
> #define QCOM_SCM_PAS_SHUTDOWN_CMD 0x6
> #define QCOM_SCM_PAS_IS_SUPPORTED_CMD 0x7
> +#define QCOM_SCM_PAS_MSS_RESET 0xa
> extern bool __qcom_scm_pas_supported(u32 peripheral);
> extern int __qcom_scm_pas_init_image(u32 peripheral, dma_addr_t metadata_phys);
> extern int __qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr, phys_addr_t size);
> extern int __qcom_scm_pas_auth_and_reset(u32 peripheral);
> extern int __qcom_scm_pas_shutdown(u32 peripheral);
> +extern int __qcom_scm_pas_mss_reset(bool reset);
>
> /* common error codes */
> #define QCOM_SCM_ENOMEM -5
>
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