On 6/23/19, 1:52 AM, Vidya Sagar wrote:
Cleanup DBI read and write APIs by removing "__" (underscore) from their
names as there are no no-underscore versions and the underscore versions
are already doing what no-underscore versions typically do. It also removes
passing dbi/dbi2 base address as one of the arguments as the same can be
derived with in read and write APIs. Since dw_pcie_{readl/writel}_dbi()
APIs can't be used for ATU read/write as ATU base address could be
different from DBI base address, this patch attempts to implement
ATU read/write APIs using ATU base address without using
dw_pcie_{readl/writel}_dbi() APIs.
Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx>
---
Changes from v6:
* Modified ATU read/write APIs to use implementation specific DBI read/write
APIs if present.
Changes from v5:
* Removed passing base address as one of the arguments as the same can be derived within
the API itself.
* Modified ATU read/write APIs to call dw_pcie_{write/read}() API
Changes from v4:
* This is a new patch in this series
drivers/pci/controller/dwc/pcie-designware.c | 28 +++++------
drivers/pci/controller/dwc/pcie-designware.h | 51 +++++++++++++-------
2 files changed, 45 insertions(+), 34 deletions(-)
.....
static inline void dw_pcie_writel_atu(struct dw_pcie *pci, u32 reg, u32 val)
{
- __dw_pcie_write_dbi(pci, pci->atu_base, reg, 0x4, val);
+ int ret;
+
+ if (pci->ops->write_dbi) {
+ pci->ops->write_dbi(pci, pci->atu_base, reg, 0x4, val);
+ return;
+ }
+
+ ret = dw_pcie_write(pci->atu_base + reg, 0x4, val);
+ if (ret)
+ dev_err(pci->dev, "Write ATU address failed\n");
}
static inline u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 reg)
{
- return __dw_pcie_read_dbi(pci, pci->atu_base, reg, 0x4);
+ int ret;
+ u32 val;
+
+ if (pci->ops->read_dbi)
+ return pci->ops->read_dbi(pci, pci->atu_base, reg, 0x4);
+
+ ret = dw_pcie_read(pci->atu_base + reg, 0x4, &val);
+ if (ret)
+ dev_err(pci->dev, "Read ATU address failed\n");
+
+ return val;
}
Hmm. In cases of dbi and dbi2, readb/readw/readl and writeb/writew/writel are
located in pcie-designware.h. These functions just call read/write which are located
in pcie-designware.c. For readability, would you write the code as below?
1. For drivers/pci/controller/dwc/pcie-designware.h,
Just call dw_pcie_{write/read}_atu(), instead of implementing functions as below.
static inline void dw_pcie_writel_atu(struct dw_pcie *pci, u32 reg, u32 val)
{
return dw_pcie_write_atu(pci, reg, 0x4, val);
}
static inline u32 dw_pcie_readl_atu(struct dw_pcie *pci, u32 reg)
{
return dw_pcie_read_atu(pci, reg, 0x4);
}
2. For drivers/pci/controller/dwc/pcie-designware.c,
Please add new dw_pcie_{write/read}_atu() as below.
void dw_pcie_write_atu(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
{
int ret;
if (pci->ops->write_dbi) {
pci->ops->write_dbi(pci, pci->atu_base, reg, size, val);
return;
}
ret = dw_pcie_write(pci->atu_base + reg, size, val);
if (ret)
dev_err(pci->dev, "Write ATU address failed\n");
}
u32 dw_pcie_read_atu(struct dw_pcie *pci, u32 reg, size_t size)
{
int ret;
u32 val;
if (pci->ops->read_dbi)
return pci->ops->read_dbi(pci, pci->atu_base, reg, size);
ret = dw_pcie_read(pci->atu_base + reg, size, &val);
if (ret)
dev_err(pci->dev, "Read ATU address failed\n");
return val;
}
Thank you.
Best regards,
Jingoo Han
