Subject: Re: [PATCH v2 3/4] firmware/qcom_scm: Add scm call to handle smmu errata

From: Bjorn Andersson <[email-masked]>
Date: Mon, 25 Mar 2019 14:10:10 -0700

On Sun 09 Sep 23:25 PDT 2018, Vivek Gautam wrote:

> Qcom's smmu-500 needs to toggle wait-for-safe sequence to
> handle TLB invalidation sync's.
> Few firmwares allow doing that through SCM interface.
> Add API to toggle wait for safe from firmware through a
> SCM call.
> 
> Signed-off-by: Vivek Gautam <[email-masked]>

Reviewed-by: Bjorn Andersson <[email-masked]>

Regards,
Bjorn

> ---
>  drivers/firmware/qcom_scm-32.c |  5 +++++
>  drivers/firmware/qcom_scm-64.c | 13 +++++++++++++
>  drivers/firmware/qcom_scm.c    |  6 ++++++
>  drivers/firmware/qcom_scm.h    |  5 +++++
>  include/linux/qcom_scm.h       |  2 ++
>  5 files changed, 31 insertions(+)
> 
> diff --git a/drivers/firmware/qcom_scm-32.c b/drivers/firmware/qcom_scm-32.c
> index 7293e5efad69..2d301ad053f8 100644
> --- a/drivers/firmware/qcom_scm-32.c
> +++ b/drivers/firmware/qcom_scm-32.c
> @@ -639,3 +639,8 @@ int __qcom_scm_io_writel_atomic(struct device *dev, phys_addr_t addr,
>  {
>  	return -ENODEV;
>  }
> +
> +int __qcom_scm_qsmmu500_wait_safe_toggle(struct device *dev, bool enable)
> +{
> +	return -ENODEV;
> +}
> diff --git a/drivers/firmware/qcom_scm-64.c b/drivers/firmware/qcom_scm-64.c
> index 6bf55403f6e3..f13bcabc5d78 100644
> --- a/drivers/firmware/qcom_scm-64.c
> +++ b/drivers/firmware/qcom_scm-64.c
> @@ -590,3 +590,16 @@ int __qcom_scm_io_writel_atomic(struct device *dev, phys_addr_t addr,
>  	return qcom_scm_call_atomic(dev, QCOM_SCM_SVC_IO, QCOM_SCM_IO_WRITE,
>  				    &desc, &res);
>  }
> +
> +int __qcom_scm_qsmmu500_wait_safe_toggle(struct device *dev, bool en)
> +{
> +	struct qcom_scm_desc desc = {0};
> +	struct arm_smccc_res res;
> +
> +	desc.args[0] = QCOM_SCM_CONFIG_ERRATA1_CLIENT_ALL;
> +	desc.args[1] = en;
> +	desc.arginfo = QCOM_SCM_ARGS(2);
> +
> +	return qcom_scm_call_atomic(dev, QCOM_SCM_SVC_SMMU_PROGRAM,
> +				    QCOM_SCM_CONFIG_ERRATA1, &desc, &res);
> +}
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index 36da0000b37f..5f15cc2e9f69 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -353,6 +353,12 @@ int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare)
>  }
>  EXPORT_SYMBOL(qcom_scm_iommu_secure_ptbl_init);
>  
> +int qcom_scm_qsmmu500_wait_safe_toggle(bool en)
> +{
> +	return __qcom_scm_qsmmu500_wait_safe_toggle(__scm->dev, en);
> +}
> +EXPORT_SYMBOL(qcom_scm_qsmmu500_wait_safe_toggle);
> +
>  int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val)
>  {
>  	return __qcom_scm_io_readl(__scm->dev, addr, val);
> diff --git a/drivers/firmware/qcom_scm.h b/drivers/firmware/qcom_scm.h
> index bb176107f51e..89a822c23e33 100644
> --- a/drivers/firmware/qcom_scm.h
> +++ b/drivers/firmware/qcom_scm.h
> @@ -103,10 +103,15 @@ extern int __qcom_scm_restore_sec_cfg(struct device *dev, u32 device_id,
>  				      u32 spare);
>  #define QCOM_SCM_IOMMU_SECURE_PTBL_SIZE	3
>  #define QCOM_SCM_IOMMU_SECURE_PTBL_INIT	4
> +#define QCOM_SCM_SVC_SMMU_PROGRAM	0x15
> +#define QCOM_SCM_CONFIG_ERRATA1		0x3
> +#define QCOM_SCM_CONFIG_ERRATA1_CLIENT_ALL	0x2
>  extern int __qcom_scm_iommu_secure_ptbl_size(struct device *dev, u32 spare,
>  					     size_t *size);
>  extern int __qcom_scm_iommu_secure_ptbl_init(struct device *dev, u64 addr,
>  					     u32 size, u32 spare);
> +extern int __qcom_scm_qsmmu500_wait_safe_toggle(struct device *dev,
> +						bool enable);
>  #define QCOM_MEM_PROT_ASSIGN_ID	0x16
>  extern int  __qcom_scm_assign_mem(struct device *dev,
>  				  phys_addr_t mem_region, size_t mem_sz,
> diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
> index 6a5d0c98b328..46e6b1692998 100644
> --- a/include/linux/qcom_scm.h
> +++ b/include/linux/qcom_scm.h
> @@ -62,6 +62,7 @@ extern int qcom_scm_set_remote_state(u32 state, u32 id);
>  extern int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare);
>  extern int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size);
>  extern int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare);
> +extern int qcom_scm_qsmmu500_wait_safe_toggle(bool en);
>  extern int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val);
>  extern int qcom_scm_io_writel(phys_addr_t addr, unsigned int val);
>  extern int qcom_scm_io_readl_atomic(phys_addr_t addr, unsigned int *val);
> @@ -100,6 +101,7 @@ qcom_scm_set_remote_state(u32 state,u32 id) { return -ENODEV; }
>  static inline int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare) { return -ENODEV; }
>  static inline int qcom_scm_iommu_secure_ptbl_size(u32 spare, size_t *size) { return -ENODEV; }
>  static inline int qcom_scm_iommu_secure_ptbl_init(u64 addr, u32 size, u32 spare) { return -ENODEV; }
> +static inline int qcom_scm_qsmmu500_wait_safe_toggle(bool en) { return -ENODEV; }
>  static inline int qcom_scm_io_readl(phys_addr_t addr, unsigned int *val) { return -ENODEV; }
>  static inline int qcom_scm_io_writel(phys_addr_t addr, unsigned int val) { return -ENODEV; }
>  static inline int qcom_scm_io_readl_atomic(phys_addr_t addr, unsigned int *val) { return -ENODEV; }
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> 

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