[03/13] PCI: cadence: Add support to use custom read and write accessors
diff mbox series

Message ID 20191209092147.22901-4-kishon@ti.com
State Superseded
Delegated to: Lorenzo Pieralisi
Headers show
Series
  • Add PCIe support to TI's J721E SoC
Related show

Commit Message

Kishon Vijay Abraham I Dec. 9, 2019, 9:21 a.m. UTC
Add support to use custom read and write accessors. Platforms that
doesn't support half word or byte access or any other constraint
while accessing registers can use this feature to populate custom
read and write accessors. These custom accessors are used for both
standard register access and configuration space register access.
This is in preparation for adding PCIe support in TI's J721E SoC which
uses Cadence PCIe core.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
---
 drivers/pci/controller/cadence/pcie-cadence.h | 99 +++++++++++++++++--
 1 file changed, 90 insertions(+), 9 deletions(-)

Comments

Andrew Murray Dec. 16, 2019, 2:07 p.m. UTC | #1
On Mon, Dec 09, 2019 at 02:51:37PM +0530, Kishon Vijay Abraham I wrote:
> Add support to use custom read and write accessors. Platforms that
> doesn't support half word or byte access or any other constraint

s/doesn't/don't/

> while accessing registers can use this feature to populate custom
> read and write accessors. These custom accessors are used for both
> standard register access and configuration space register access.

You can put the following sentence underneath a --- as it's not needed
in the commit message (but may be helpful to reviewers).

> This is in preparation for adding PCIe support in TI's J721E SoC which
> uses Cadence PCIe core.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
>  drivers/pci/controller/cadence/pcie-cadence.h | 99 +++++++++++++++++--
>  1 file changed, 90 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
> index a2b28b912ca4..d0d91c69fa1d 100644
> --- a/drivers/pci/controller/cadence/pcie-cadence.h
> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
> @@ -223,6 +223,11 @@ enum cdns_pcie_msg_routing {
>  	MSG_ROUTING_GATHER,
>  };
>  
> +struct cdns_pcie_ops {
> +	u32	(*read)(void __iomem *addr, int size);
> +	void	(*write)(void __iomem *addr, int size, u32 value);
> +};
> +
>  /**
>   * struct cdns_pcie - private data for Cadence PCIe controller drivers
>   * @reg_base: IO mapped register base
> @@ -239,7 +244,7 @@ struct cdns_pcie {
>  	int			phy_count;
>  	struct phy		**phy;
>  	struct device_link	**link;
> -	const struct cdns_pcie_common_ops *ops;

What was cdns_pcie_common_ops? It's not defined in the current tree is it?

> +	const struct cdns_pcie_ops *ops;
>  };
>  
>  /**
> @@ -301,21 +306,47 @@ struct cdns_pcie_ep {
>  /* Register access */
>  static inline void cdns_pcie_writeb(struct cdns_pcie *pcie, u32 reg, u8 value)
>  {
> +	void __iomem *addr = pcie->reg_base + reg;
> +
> +	if (pcie->ops && pcie->ops->write) {
> +		pcie->ops->write(addr, 0x1, value);
> +		return;
> +	}
> +
>  	writeb(value, pcie->reg_base + reg);

Can you use 'addr' here instead of 'pcie->reg_base + reg'? (And similar for the
rest of them).

Thanks,

Andrew Murray


>  }
>  
>  static inline void cdns_pcie_writew(struct cdns_pcie *pcie, u32 reg, u16 value)
>  {
> +	void __iomem *addr = pcie->reg_base + reg;
> +
> +	if (pcie->ops && pcie->ops->write) {
> +		pcie->ops->write(addr, 0x2, value);
> +		return;
> +	}
> +
>  	writew(value, pcie->reg_base + reg);
>  }
>  
>  static inline void cdns_pcie_writel(struct cdns_pcie *pcie, u32 reg, u32 value)
>  {
> +	void __iomem *addr = pcie->reg_base + reg;
> +
> +	if (pcie->ops && pcie->ops->write) {
> +		pcie->ops->write(addr, 0x4, value);
> +		return;
> +	}
> +
>  	writel(value, pcie->reg_base + reg);
>  }
>  
>  static inline u32 cdns_pcie_readl(struct cdns_pcie *pcie, u32 reg)
>  {
> +	void __iomem *addr = pcie->reg_base + reg;
> +
> +	if (pcie->ops && pcie->ops->read)
> +		return pcie->ops->read(addr, 0x4);
> +
>  	return readl(pcie->reg_base + reg);
>  }
>  
> @@ -323,47 +354,97 @@ static inline u32 cdns_pcie_readl(struct cdns_pcie *pcie, u32 reg)
>  static inline void cdns_pcie_rp_writeb(struct cdns_pcie *pcie,
>  				       u32 reg, u8 value)
>  {
> -	writeb(value, pcie->reg_base + CDNS_PCIE_RP_BASE + reg);
> +	void __iomem *addr = pcie->reg_base + CDNS_PCIE_RP_BASE + reg;
> +
> +	if (pcie->ops && pcie->ops->write) {
> +		pcie->ops->write(addr, 0x1, value);
> +		return;
> +	}
> +
> +	writeb(value, addr);
>  }
>  
>  static inline void cdns_pcie_rp_writew(struct cdns_pcie *pcie,
>  				       u32 reg, u16 value)
>  {
> -	writew(value, pcie->reg_base + CDNS_PCIE_RP_BASE + reg);
> +	void __iomem *addr = pcie->reg_base + CDNS_PCIE_RP_BASE + reg;
> +
> +	if (pcie->ops && pcie->ops->write) {
> +		pcie->ops->write(addr, 0x2, value);
> +		return;
> +	}
> +
> +	writew(value, addr);
>  }
>  
>  /* Endpoint Function register access */
>  static inline void cdns_pcie_ep_fn_writeb(struct cdns_pcie *pcie, u8 fn,
>  					  u32 reg, u8 value)
>  {
> -	writeb(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
> +	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
> +
> +	if (pcie->ops && pcie->ops->write) {
> +		pcie->ops->write(addr, 0x1, value);
> +		return;
> +	}
> +
> +	writeb(value, addr);
>  }
>  
>  static inline void cdns_pcie_ep_fn_writew(struct cdns_pcie *pcie, u8 fn,
>  					  u32 reg, u16 value)
>  {
> -	writew(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
> +	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
> +
> +	if (pcie->ops && pcie->ops->write) {
> +		pcie->ops->write(addr, 0x2, value);
> +		return;
> +	}
> +
> +	writew(value, addr);
>  }
>  
>  static inline void cdns_pcie_ep_fn_writel(struct cdns_pcie *pcie, u8 fn,
>  					  u32 reg, u32 value)
>  {
> -	writel(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
> +	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
> +
> +	if (pcie->ops && pcie->ops->write) {
> +		pcie->ops->write(addr, 0x4, value);
> +		return;
> +	}
> +
> +	writel(value, addr);
>  }
>  
>  static inline u8 cdns_pcie_ep_fn_readb(struct cdns_pcie *pcie, u8 fn, u32 reg)
>  {
> -	return readb(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
> +	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
> +
> +	if (pcie->ops && pcie->ops->read)
> +		return pcie->ops->read(addr, 0x1);
> +
> +	return readb(addr);
>  }
>  
>  static inline u16 cdns_pcie_ep_fn_readw(struct cdns_pcie *pcie, u8 fn, u32 reg)
>  {
> -	return readw(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
> +	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
> +
> +	if (pcie->ops && pcie->ops->read)
> +		return pcie->ops->read(addr, 0x2);
> +
> +	return readw(addr);
>  }
>  
>  static inline u32 cdns_pcie_ep_fn_readl(struct cdns_pcie *pcie, u8 fn, u32 reg)
>  {
> -	return readl(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
> +	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
> +
> +	if (pcie->ops && pcie->ops->read)
> +		return pcie->ops->read(addr, 0x4);
> +
> +	return readl(addr);
>  }
>  
>  #ifdef CONFIG_PCIE_CADENCE_HOST
> -- 
> 2.17.1
>
Kishon Vijay Abraham I Dec. 19, 2019, 11:41 a.m. UTC | #2
Hi,

On 16/12/19 7:37 pm, Andrew Murray wrote:
> On Mon, Dec 09, 2019 at 02:51:37PM +0530, Kishon Vijay Abraham I wrote:
>> Add support to use custom read and write accessors. Platforms that
>> doesn't support half word or byte access or any other constraint
> 
> s/doesn't/don't/
> 
>> while accessing registers can use this feature to populate custom
>> read and write accessors. These custom accessors are used for both
>> standard register access and configuration space register access.
> 
> You can put the following sentence underneath a --- as it's not needed
> in the commit message (but may be helpful to reviewers).
> 
>> This is in preparation for adding PCIe support in TI's J721E SoC which
>> uses Cadence PCIe core.
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
>> ---
>>  drivers/pci/controller/cadence/pcie-cadence.h | 99 +++++++++++++++++--
>>  1 file changed, 90 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
>> index a2b28b912ca4..d0d91c69fa1d 100644
>> --- a/drivers/pci/controller/cadence/pcie-cadence.h
>> +++ b/drivers/pci/controller/cadence/pcie-cadence.h
>> @@ -223,6 +223,11 @@ enum cdns_pcie_msg_routing {
>>  	MSG_ROUTING_GATHER,
>>  };
>>  
>> +struct cdns_pcie_ops {
>> +	u32	(*read)(void __iomem *addr, int size);
>> +	void	(*write)(void __iomem *addr, int size, u32 value);
>> +};
>> +
>>  /**
>>   * struct cdns_pcie - private data for Cadence PCIe controller drivers
>>   * @reg_base: IO mapped register base
>> @@ -239,7 +244,7 @@ struct cdns_pcie {
>>  	int			phy_count;
>>  	struct phy		**phy;
>>  	struct device_link	**link;
>> -	const struct cdns_pcie_common_ops *ops;
> 
> What was cdns_pcie_common_ops? It's not defined in the current tree is it?

Yeah, it's spurious change that has got merged.
> 
>> +	const struct cdns_pcie_ops *ops;
>>  };
>>  
>>  /**
>> @@ -301,21 +306,47 @@ struct cdns_pcie_ep {
>>  /* Register access */
>>  static inline void cdns_pcie_writeb(struct cdns_pcie *pcie, u32 reg, u8 value)
>>  {
>> +	void __iomem *addr = pcie->reg_base + reg;
>> +
>> +	if (pcie->ops && pcie->ops->write) {
>> +		pcie->ops->write(addr, 0x1, value);
>> +		return;
>> +	}
>> +
>>  	writeb(value, pcie->reg_base + reg);
> 
> Can you use 'addr' here instead of 'pcie->reg_base + reg'? (And similar for the
> rest of them).

Sure.

Thanks
Kishon

Patch
diff mbox series

diff --git a/drivers/pci/controller/cadence/pcie-cadence.h b/drivers/pci/controller/cadence/pcie-cadence.h
index a2b28b912ca4..d0d91c69fa1d 100644
--- a/drivers/pci/controller/cadence/pcie-cadence.h
+++ b/drivers/pci/controller/cadence/pcie-cadence.h
@@ -223,6 +223,11 @@  enum cdns_pcie_msg_routing {
 	MSG_ROUTING_GATHER,
 };
 
+struct cdns_pcie_ops {
+	u32	(*read)(void __iomem *addr, int size);
+	void	(*write)(void __iomem *addr, int size, u32 value);
+};
+
 /**
  * struct cdns_pcie - private data for Cadence PCIe controller drivers
  * @reg_base: IO mapped register base
@@ -239,7 +244,7 @@  struct cdns_pcie {
 	int			phy_count;
 	struct phy		**phy;
 	struct device_link	**link;
-	const struct cdns_pcie_common_ops *ops;
+	const struct cdns_pcie_ops *ops;
 };
 
 /**
@@ -301,21 +306,47 @@  struct cdns_pcie_ep {
 /* Register access */
 static inline void cdns_pcie_writeb(struct cdns_pcie *pcie, u32 reg, u8 value)
 {
+	void __iomem *addr = pcie->reg_base + reg;
+
+	if (pcie->ops && pcie->ops->write) {
+		pcie->ops->write(addr, 0x1, value);
+		return;
+	}
+
 	writeb(value, pcie->reg_base + reg);
 }
 
 static inline void cdns_pcie_writew(struct cdns_pcie *pcie, u32 reg, u16 value)
 {
+	void __iomem *addr = pcie->reg_base + reg;
+
+	if (pcie->ops && pcie->ops->write) {
+		pcie->ops->write(addr, 0x2, value);
+		return;
+	}
+
 	writew(value, pcie->reg_base + reg);
 }
 
 static inline void cdns_pcie_writel(struct cdns_pcie *pcie, u32 reg, u32 value)
 {
+	void __iomem *addr = pcie->reg_base + reg;
+
+	if (pcie->ops && pcie->ops->write) {
+		pcie->ops->write(addr, 0x4, value);
+		return;
+	}
+
 	writel(value, pcie->reg_base + reg);
 }
 
 static inline u32 cdns_pcie_readl(struct cdns_pcie *pcie, u32 reg)
 {
+	void __iomem *addr = pcie->reg_base + reg;
+
+	if (pcie->ops && pcie->ops->read)
+		return pcie->ops->read(addr, 0x4);
+
 	return readl(pcie->reg_base + reg);
 }
 
@@ -323,47 +354,97 @@  static inline u32 cdns_pcie_readl(struct cdns_pcie *pcie, u32 reg)
 static inline void cdns_pcie_rp_writeb(struct cdns_pcie *pcie,
 				       u32 reg, u8 value)
 {
-	writeb(value, pcie->reg_base + CDNS_PCIE_RP_BASE + reg);
+	void __iomem *addr = pcie->reg_base + CDNS_PCIE_RP_BASE + reg;
+
+	if (pcie->ops && pcie->ops->write) {
+		pcie->ops->write(addr, 0x1, value);
+		return;
+	}
+
+	writeb(value, addr);
 }
 
 static inline void cdns_pcie_rp_writew(struct cdns_pcie *pcie,
 				       u32 reg, u16 value)
 {
-	writew(value, pcie->reg_base + CDNS_PCIE_RP_BASE + reg);
+	void __iomem *addr = pcie->reg_base + CDNS_PCIE_RP_BASE + reg;
+
+	if (pcie->ops && pcie->ops->write) {
+		pcie->ops->write(addr, 0x2, value);
+		return;
+	}
+
+	writew(value, addr);
 }
 
 /* Endpoint Function register access */
 static inline void cdns_pcie_ep_fn_writeb(struct cdns_pcie *pcie, u8 fn,
 					  u32 reg, u8 value)
 {
-	writeb(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
+
+	if (pcie->ops && pcie->ops->write) {
+		pcie->ops->write(addr, 0x1, value);
+		return;
+	}
+
+	writeb(value, addr);
 }
 
 static inline void cdns_pcie_ep_fn_writew(struct cdns_pcie *pcie, u8 fn,
 					  u32 reg, u16 value)
 {
-	writew(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
+
+	if (pcie->ops && pcie->ops->write) {
+		pcie->ops->write(addr, 0x2, value);
+		return;
+	}
+
+	writew(value, addr);
 }
 
 static inline void cdns_pcie_ep_fn_writel(struct cdns_pcie *pcie, u8 fn,
 					  u32 reg, u32 value)
 {
-	writel(value, pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
+
+	if (pcie->ops && pcie->ops->write) {
+		pcie->ops->write(addr, 0x4, value);
+		return;
+	}
+
+	writel(value, addr);
 }
 
 static inline u8 cdns_pcie_ep_fn_readb(struct cdns_pcie *pcie, u8 fn, u32 reg)
 {
-	return readb(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
+
+	if (pcie->ops && pcie->ops->read)
+		return pcie->ops->read(addr, 0x1);
+
+	return readb(addr);
 }
 
 static inline u16 cdns_pcie_ep_fn_readw(struct cdns_pcie *pcie, u8 fn, u32 reg)
 {
-	return readw(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
+
+	if (pcie->ops && pcie->ops->read)
+		return pcie->ops->read(addr, 0x2);
+
+	return readw(addr);
 }
 
 static inline u32 cdns_pcie_ep_fn_readl(struct cdns_pcie *pcie, u8 fn, u32 reg)
 {
-	return readl(pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg);
+	void __iomem *addr = pcie->reg_base + CDNS_PCIE_EP_FUNC_BASE(fn) + reg;
+
+	if (pcie->ops && pcie->ops->read)
+		return pcie->ops->read(addr, 0x4);
+
+	return readl(addr);
 }
 
 #ifdef CONFIG_PCIE_CADENCE_HOST