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[PATCH V5 1/3] firmware: qcom_scm: provide a read-modify-write function

Kathiravan T posted 3 patches 2 years, 6 months ago
[PATCH V5 1/3] firmware: qcom_scm: provide a read-modify-write function
Posted by Kathiravan T 2 years, 6 months ago 
From: Mukesh Ojha <quic_mojha@quicinc.com>

It was realized by Srinivas K. that there is a need of read-modify-write
scm exported function so that it can be used by multiple clients.

Let's introduce qcom_scm_io_update_field() which masks out the bits and
write the passed value to that bit-offset.

Suggested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
---
Changes in V5:
	- No changes

 drivers/firmware/qcom_scm.c            | 15 +++++++++++++++
 include/linux/firmware/qcom/qcom_scm.h |  2 ++
 2 files changed, 17 insertions(+)

diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index fde33acd46b7..104d86e49b97 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -407,6 +407,21 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
 }
 EXPORT_SYMBOL(qcom_scm_set_remote_state);
 
+int qcom_scm_io_update_field(phys_addr_t addr, unsigned int mask, unsigned int val)
+{
+	unsigned int old, new;
+	int ret;
+
+	ret = qcom_scm_io_readl(addr, &old);
+	if (ret)
+		return ret;
+
+	new = (old & ~mask) | (val & mask);
+
+	return qcom_scm_io_writel(addr, new);
+}
+EXPORT_SYMBOL(qcom_scm_io_update_field);
+
 static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
 {
 	struct qcom_scm_desc desc = {
diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
index 250ea4efb7cb..ca41e4eb33ad 100644
--- a/include/linux/firmware/qcom/qcom_scm.h
+++ b/include/linux/firmware/qcom/qcom_scm.h
@@ -84,6 +84,8 @@ extern bool qcom_scm_pas_supported(u32 peripheral);
 
 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_update_field(phys_addr_t addr, unsigned int mask,
+				    unsigned int val);
 
 extern bool qcom_scm_restore_sec_cfg_available(void);
 extern int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare);
-- 
2.34.1
Re: [PATCH V5 1/3] firmware: qcom_scm: provide a read-modify-write function
Posted by Elliot Berman 2 years, 6 months ago 

On 7/20/2023 12:04 AM, Kathiravan T wrote:
> From: Mukesh Ojha <quic_mojha@quicinc.com>
> 
> It was realized by Srinivas K. that there is a need of read-modify-write
> scm exported function so that it can be used by multiple clients.
> 
> Let's introduce qcom_scm_io_update_field() which masks out the bits and
> write the passed value to that bit-offset.
> 
> Suggested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
> Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>


After updating EXPORT_SYMBOL -> EXPORT_SYMBOL_GPL:

Reviewed-by: Elliot Berman <quic_eberman@quicinc.com>

> ---
> Changes in V5:
> 	- No changes
> 
>   drivers/firmware/qcom_scm.c            | 15 +++++++++++++++
>   include/linux/firmware/qcom/qcom_scm.h |  2 ++
>   2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index fde33acd46b7..104d86e49b97 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -407,6 +407,21 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
>   }
>   EXPORT_SYMBOL(qcom_scm_set_remote_state);
>   
> +int qcom_scm_io_update_field(phys_addr_t addr, unsigned int mask, unsigned int val)
> +{
> +	unsigned int old, new;
> +	int ret;
> +
> +	ret = qcom_scm_io_readl(addr, &old);
> +	if (ret)
> +		return ret;
> +
> +	new = (old & ~mask) | (val & mask);
> +
> +	return qcom_scm_io_writel(addr, new);
> +}
> +EXPORT_SYMBOL(qcom_scm_io_update_field);
> +
>   static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
>   {
>   	struct qcom_scm_desc desc = {
> diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
> index 250ea4efb7cb..ca41e4eb33ad 100644
> --- a/include/linux/firmware/qcom/qcom_scm.h
> +++ b/include/linux/firmware/qcom/qcom_scm.h
> @@ -84,6 +84,8 @@ extern bool qcom_scm_pas_supported(u32 peripheral);
>   
>   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_update_field(phys_addr_t addr, unsigned int mask,
> +				    unsigned int val);
>   
>   extern bool qcom_scm_restore_sec_cfg_available(void);
>   extern int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare);
Re: [PATCH V5 1/3] firmware: qcom_scm: provide a read-modify-write function
Posted by Trilok Soni 2 years, 6 months ago 
On 7/20/2023 12:04 AM, Kathiravan T wrote:
> From: Mukesh Ojha <quic_mojha@quicinc.com>
> 
> It was realized by Srinivas K. that there is a need of read-modify-write
> scm exported function so that it can be used by multiple clients.
> 
> Let's introduce qcom_scm_io_update_field() which masks out the bits and
> write the passed value to that bit-offset.
> 
> Suggested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
> Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
> ---
> Changes in V5:
> 	- No changes
> 
>   drivers/firmware/qcom_scm.c            | 15 +++++++++++++++
>   include/linux/firmware/qcom/qcom_scm.h |  2 ++
>   2 files changed, 17 insertions(+)
> 
> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> index fde33acd46b7..104d86e49b97 100644
> --- a/drivers/firmware/qcom_scm.c
> +++ b/drivers/firmware/qcom_scm.c
> @@ -407,6 +407,21 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
>   }
>   EXPORT_SYMBOL(qcom_scm_set_remote_state);
>   
> +int qcom_scm_io_update_field(phys_addr_t addr, unsigned int mask, unsigned int val)
> +{
> +	unsigned int old, new;
> +	int ret;
> +
> +	ret = qcom_scm_io_readl(addr, &old);
> +	if (ret)
> +		return ret;
> +
> +	new = (old & ~mask) | (val & mask);
> +
> +	return qcom_scm_io_writel(addr, new);
> +}
> +EXPORT_SYMBOL(qcom_scm_io_update_field);

EXPORT_SYMBO_GPL please.

> +
>   static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
>   {
>   	struct qcom_scm_desc desc = {
> diff --git a/include/linux/firmware/qcom/qcom_scm.h b/include/linux/firmware/qcom/qcom_scm.h
> index 250ea4efb7cb..ca41e4eb33ad 100644
> --- a/include/linux/firmware/qcom/qcom_scm.h
> +++ b/include/linux/firmware/qcom/qcom_scm.h
> @@ -84,6 +84,8 @@ extern bool qcom_scm_pas_supported(u32 peripheral);
>   
>   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_update_field(phys_addr_t addr, unsigned int mask,
> +				    unsigned int val);
>   
>   extern bool qcom_scm_restore_sec_cfg_available(void);
>   extern int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare);
Re: [PATCH V5 1/3] firmware: qcom_scm: provide a read-modify-write function
Posted by Kathiravan T 2 years, 6 months ago 
On 7/22/2023 6:47 AM, Trilok Soni wrote:
> On 7/20/2023 12:04 AM, Kathiravan T wrote:
>> From: Mukesh Ojha <quic_mojha@quicinc.com>
>>
>> It was realized by Srinivas K. that there is a need of read-modify-write
>> scm exported function so that it can be used by multiple clients.
>>
>> Let's introduce qcom_scm_io_update_field() which masks out the bits and
>> write the passed value to that bit-offset.
>>
>> Suggested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>> Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
>> Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
>> ---
>> Changes in V5:
>>     - No changes
>>
>>   drivers/firmware/qcom_scm.c            | 15 +++++++++++++++
>>   include/linux/firmware/qcom/qcom_scm.h |  2 ++
>>   2 files changed, 17 insertions(+)
>>
>> diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
>> index fde33acd46b7..104d86e49b97 100644
>> --- a/drivers/firmware/qcom_scm.c
>> +++ b/drivers/firmware/qcom_scm.c
>> @@ -407,6 +407,21 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
>>   }
>>   EXPORT_SYMBOL(qcom_scm_set_remote_state);
>>   +int qcom_scm_io_update_field(phys_addr_t addr, unsigned int mask, 
>> unsigned int val)
>> +{
>> +    unsigned int old, new;
>> +    int ret;
>> +
>> +    ret = qcom_scm_io_readl(addr, &old);
>> +    if (ret)
>> +        return ret;
>> +
>> +    new = (old & ~mask) | (val & mask);
>> +
>> +    return qcom_scm_io_writel(addr, new);
>> +}
>> +EXPORT_SYMBOL(qcom_scm_io_update_field);
>
> EXPORT_SYMBO_GPL please.


Sure, is it okay if I send the patch to convert the existing 
EXPORT_SYMBOL to EXPORT_SYMBOL_GPL as well?


>
>> +
>>   static int __qcom_scm_set_dload_mode(struct device *dev, bool enable)
>>   {
>>       struct qcom_scm_desc desc = {
>> diff --git a/include/linux/firmware/qcom/qcom_scm.h 
>> b/include/linux/firmware/qcom/qcom_scm.h
>> index 250ea4efb7cb..ca41e4eb33ad 100644
>> --- a/include/linux/firmware/qcom/qcom_scm.h
>> +++ b/include/linux/firmware/qcom/qcom_scm.h
>> @@ -84,6 +84,8 @@ extern bool qcom_scm_pas_supported(u32 peripheral);
>>     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_update_field(phys_addr_t addr, unsigned int 
>> mask,
>> +                    unsigned int val);
>>     extern bool qcom_scm_restore_sec_cfg_available(void);
>>   extern int qcom_scm_restore_sec_cfg(u32 device_id, u32 spare);
Re: [PATCH V5 1/3] firmware: qcom_scm: provide a read-modify-write function
Posted by Guru Das Srinagesh 2 years, 6 months ago 
On Jul 23 2023 19:25, Kathiravan T wrote:
> 
> On 7/22/2023 6:47 AM, Trilok Soni wrote:
> >On 7/20/2023 12:04 AM, Kathiravan T wrote:
> >>From: Mukesh Ojha <quic_mojha@quicinc.com>
> >>
> >>It was realized by Srinivas K. that there is a need of read-modify-write
> >>scm exported function so that it can be used by multiple clients.
> >>
> >>Let's introduce qcom_scm_io_update_field() which masks out the bits and
> >>write the passed value to that bit-offset.
> >>
> >>Suggested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
> >>Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
> >>Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
> >>---
> >>Changes in V5:
> >>    - No changes
> >>
> >>  drivers/firmware/qcom_scm.c            | 15 +++++++++++++++
> >>  include/linux/firmware/qcom/qcom_scm.h |  2 ++
> >>  2 files changed, 17 insertions(+)
> >>
> >>diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
> >>index fde33acd46b7..104d86e49b97 100644
> >>--- a/drivers/firmware/qcom_scm.c
> >>+++ b/drivers/firmware/qcom_scm.c
> >>@@ -407,6 +407,21 @@ int qcom_scm_set_remote_state(u32 state, u32 id)
> >>  }
> >>  EXPORT_SYMBOL(qcom_scm_set_remote_state);
> >>  +int qcom_scm_io_update_field(phys_addr_t addr, unsigned int mask,
> >>unsigned int val)
> >>+{
> >>+    unsigned int old, new;
> >>+    int ret;
> >>+
> >>+    ret = qcom_scm_io_readl(addr, &old);
> >>+    if (ret)
> >>+        return ret;
> >>+
> >>+    new = (old & ~mask) | (val & mask);
> >>+
> >>+    return qcom_scm_io_writel(addr, new);
> >>+}
> >>+EXPORT_SYMBOL(qcom_scm_io_update_field);
> >
> >EXPORT_SYMBO_GPL please.
> 
> 
> Sure, is it okay if I send the patch to convert the existing EXPORT_SYMBOL
> to EXPORT_SYMBOL_GPL as well?

This is done already [1].

[1] https://lore.kernel.org/lkml/19d9ac0bf79f957574ef9b3b73246ea0113cc0fd.1690503893.git.quic_gurus@quicinc.com/

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