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Date: Wed, 26 Jun 2019 08:56:44 +0000
From: Jingoo Han <jingoohan1@...il.com>
To: Vidya Sagar <vidyas@...dia.com>,
"gustavo.pimentel@...opsys.com" <gustavo.pimentel@...opsys.com>,
"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"Jisheng.Zhang@...aptics.com" <Jisheng.Zhang@...aptics.com>,
"thierry.reding@...il.com" <thierry.reding@...il.com>,
"kishon@...com" <kishon@...com>
CC: "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"kthota@...dia.com" <kthota@...dia.com>,
"mmaddireddy@...dia.com" <mmaddireddy@...dia.com>,
"sagar.tv@...il.com" <sagar.tv@...il.com>,
Han Jingoo <jingoohan1@...il.com>
Subject: Re: [PATCH V9 2/3] PCI: dwc: Cleanup DBI,ATU read and write APIs
On 6/25/19, 6:22 PM, 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@...dia.com>
Acked-by: Jingoo Han <jingoohan1@...il.com>
Best regards,
Jingoo Han
> ---
> Changes from v8:
> * Removed exporting dw_pcie_{read/write}_atu() APIs
>
> Changes from v7:
> * Based on suggestion from Jingoo Han, moved implementation of readl, writel for ATU
> region to separate APIs dw_pcie_{read/write}_atu() in pcie-designware.c file and
> calling them from pcie-designware.h file.
>
> 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 | 57 ++++++++++++++------
> drivers/pci/controller/dwc/pcie-designware.h | 34 ++++++------
> 2 files changed, 57 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index 9d7c51c32b3b..c2843ea1d1e8 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -52,68 +52,93 @@ int dw_pcie_write(void __iomem *addr, int size, u32 val)
> return PCIBIOS_SUCCESSFUL;
> }
>
> -u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
> - size_t size)
> +u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size)
> {
> int ret;
> u32 val;
>
> if (pci->ops->read_dbi)
> - return pci->ops->read_dbi(pci, base, reg, size);
> + return pci->ops->read_dbi(pci, pci->dbi_base, reg, size);
>
> - ret = dw_pcie_read(base + reg, size, &val);
> + ret = dw_pcie_read(pci->dbi_base + reg, size, &val);
> if (ret)
> dev_err(pci->dev, "Read DBI address failed\n");
>
> return val;
> }
>
> -void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
> - size_t size, u32 val)
> +void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
> {
> int ret;
>
> if (pci->ops->write_dbi) {
> - pci->ops->write_dbi(pci, base, reg, size, val);
> + pci->ops->write_dbi(pci, pci->dbi_base, reg, size, val);
> return;
> }
>
> - ret = dw_pcie_write(base + reg, size, val);
> + ret = dw_pcie_write(pci->dbi_base + reg, size, val);
> if (ret)
> dev_err(pci->dev, "Write DBI address failed\n");
> }
>
> -u32 __dw_pcie_read_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg,
> - size_t size)
> +u32 dw_pcie_read_dbi2(struct dw_pcie *pci, u32 reg, size_t size)
> {
> int ret;
> u32 val;
>
> if (pci->ops->read_dbi2)
> - return pci->ops->read_dbi2(pci, base, reg, size);
> + return pci->ops->read_dbi2(pci, pci->dbi_base2, reg, size);
>
> - ret = dw_pcie_read(base + reg, size, &val);
> + ret = dw_pcie_read(pci->dbi_base2 + reg, size, &val);
> if (ret)
> dev_err(pci->dev, "read DBI address failed\n");
>
> return val;
> }
>
> -void __dw_pcie_write_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg,
> - size_t size, u32 val)
> +void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
> {
> int ret;
>
> if (pci->ops->write_dbi2) {
> - pci->ops->write_dbi2(pci, base, reg, size, val);
> + pci->ops->write_dbi2(pci, pci->dbi_base2, reg, size, val);
> return;
> }
>
> - ret = dw_pcie_write(base + reg, size, val);
> + ret = dw_pcie_write(pci->dbi_base2 + reg, size, val);
> if (ret)
> dev_err(pci->dev, "write DBI 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;
> +}
> +
> +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");
> +}
> +
> static u32 dw_pcie_readl_ob_unroll(struct dw_pcie *pci, u32 index, u32 reg)
> {
> u32 offset = PCIE_GET_ATU_OUTB_UNR_REG_OFFSET(index);
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 14762e262758..ffed084a0b4f 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -254,14 +254,12 @@ struct dw_pcie {
> int dw_pcie_read(void __iomem *addr, int size, u32 *val);
> int dw_pcie_write(void __iomem *addr, int size, u32 val);
>
> -u32 __dw_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
> - size_t size);
> -void __dw_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, u32 reg,
> - size_t size, u32 val);
> -u32 __dw_pcie_read_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg,
> - size_t size);
> -void __dw_pcie_write_dbi2(struct dw_pcie *pci, void __iomem *base, u32 reg,
> - size_t size, u32 val);
> +u32 dw_pcie_read_dbi(struct dw_pcie *pci, u32 reg, size_t size);
> +void dw_pcie_write_dbi(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
> +u32 dw_pcie_read_dbi2(struct dw_pcie *pci, u32 reg, size_t size);
> +void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
> +u32 dw_pcie_read_atu(struct dw_pcie *pci, u32 reg, size_t size);
> +void dw_pcie_write_atu(struct dw_pcie *pci, u32 reg, size_t size, u32 val);
> int dw_pcie_link_up(struct dw_pcie *pci);
> int dw_pcie_wait_for_link(struct dw_pcie *pci);
> void dw_pcie_prog_outbound_atu(struct dw_pcie *pci, int index,
> @@ -275,52 +273,52 @@ void dw_pcie_setup(struct dw_pcie *pci);
>
> static inline void dw_pcie_writel_dbi(struct dw_pcie *pci, u32 reg, u32 val)
> {
> - __dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x4, val);
> + dw_pcie_write_dbi(pci, reg, 0x4, val);
> }
>
> static inline u32 dw_pcie_readl_dbi(struct dw_pcie *pci, u32 reg)
> {
> - return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x4);
> + return dw_pcie_read_dbi(pci, reg, 0x4);
> }
>
> static inline void dw_pcie_writew_dbi(struct dw_pcie *pci, u32 reg, u16 val)
> {
> - __dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x2, val);
> + dw_pcie_write_dbi(pci, reg, 0x2, val);
> }
>
> static inline u16 dw_pcie_readw_dbi(struct dw_pcie *pci, u32 reg)
> {
> - return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x2);
> + return dw_pcie_read_dbi(pci, reg, 0x2);
> }
>
> static inline void dw_pcie_writeb_dbi(struct dw_pcie *pci, u32 reg, u8 val)
> {
> - __dw_pcie_write_dbi(pci, pci->dbi_base, reg, 0x1, val);
> + dw_pcie_write_dbi(pci, reg, 0x1, val);
> }
>
> static inline u8 dw_pcie_readb_dbi(struct dw_pcie *pci, u32 reg)
> {
> - return __dw_pcie_read_dbi(pci, pci->dbi_base, reg, 0x1);
> + return dw_pcie_read_dbi(pci, reg, 0x1);
> }
>
> static inline void dw_pcie_writel_dbi2(struct dw_pcie *pci, u32 reg, u32 val)
> {
> - __dw_pcie_write_dbi2(pci, pci->dbi_base2, reg, 0x4, val);
> + dw_pcie_write_dbi2(pci, reg, 0x4, val);
> }
>
> static inline u32 dw_pcie_readl_dbi2(struct dw_pcie *pci, u32 reg)
> {
> - return __dw_pcie_read_dbi2(pci, pci->dbi_base2, reg, 0x4);
> + return dw_pcie_read_dbi2(pci, reg, 0x4);
> }
>
> 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);
> + 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_dbi(pci, pci->atu_base, reg, 0x4);
> + return dw_pcie_read_atu(pci, reg, 0x4);
> }
>
> static inline void dw_pcie_dbi_ro_wr_en(struct dw_pcie *pci)
> --
> 2.17.1
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