On Sun, Nov 13, 2022 at 10:12:57PM +0300, Serge Semin wrote:
> Since in addition to the already available iATU unrolled mapping we are
> about to add a few more DW PCIe platform-specific capabilities (CDM-check
> and generic clocks/resets resources) let's add a generic interface to set
> and get the flags indicating their availability. The new interface shall
> improve maintainability of the platform-specific code.
>
> Signed-off-by: Serge Semin <Sergey.Semin@xxxxxxxxxxxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Thanks,
Mani
> Reviewed-by: Rob Herring <robh@xxxxxxxxxx>
>
> ---
>
> Note the DW_PCIE_CAP_IATU_UNROLL macro is intentionally set to 1 since
> being added afterwards capability will be more suitable to be identified
> with position 0.
>
> Changelog v3:
> - This is a new patch created on v3 lap of the series.
> ---
> drivers/pci/controller/dwc/pcie-designware.c | 11 ++++++-----
> drivers/pci/controller/dwc/pcie-designware.h | 12 +++++++++++-
> 2 files changed, 17 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index ca830ee794a7..9d78e7ca61e1 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -211,7 +211,7 @@ void dw_pcie_write_dbi2(struct dw_pcie *pci, u32 reg, size_t size, u32 val)
> static inline void __iomem *dw_pcie_select_atu(struct dw_pcie *pci, u32 dir,
> u32 index)
> {
> - if (pci->iatu_unroll_enabled)
> + if (dw_pcie_cap_is(pci, IATU_UNROLL))
> return pci->atu_base + PCIE_ATU_UNROLL_BASE(dir, index);
>
> dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, dir | index);
> @@ -591,7 +591,7 @@ static void dw_pcie_iatu_detect_regions(struct dw_pcie *pci)
> u32 val, min, dir;
> u64 max;
>
> - if (pci->iatu_unroll_enabled) {
> + if (dw_pcie_cap_is(pci, IATU_UNROLL)) {
> max_region = min((int)pci->atu_size / 512, 256);
> } else {
> dw_pcie_writel_dbi(pci, PCIE_ATU_VIEWPORT, 0xFF);
> @@ -641,8 +641,9 @@ void dw_pcie_iatu_detect(struct dw_pcie *pci)
> {
> struct platform_device *pdev = to_platform_device(pci->dev);
>
> - pci->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pci);
> - if (pci->iatu_unroll_enabled) {
> + if (dw_pcie_iatu_unroll_enabled(pci)) {
> + dw_pcie_cap_set(pci, IATU_UNROLL);
> +
> if (!pci->atu_base) {
> struct resource *res =
> platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
> @@ -664,7 +665,7 @@ void dw_pcie_iatu_detect(struct dw_pcie *pci)
>
> dw_pcie_iatu_detect_regions(pci);
>
> - dev_info(pci->dev, "iATU unroll: %s\n", pci->iatu_unroll_enabled ?
> + dev_info(pci->dev, "iATU unroll: %s\n", dw_pcie_cap_is(pci, IATU_UNROLL) ?
> "enabled" : "disabled");
>
> dev_info(pci->dev, "iATU regions: %u ob, %u ib, align %uK, limit %lluG\n",
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 37801bbce854..c6dddacee3b1 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -12,6 +12,7 @@
> #define _PCIE_DESIGNWARE_H
>
> #include <linux/bitfield.h>
> +#include <linux/bitops.h>
> #include <linux/dma-mapping.h>
> #include <linux/irq.h>
> #include <linux/msi.h>
> @@ -43,6 +44,15 @@
> (__dw_pcie_ver_cmp(_pci, _ver, ==) && \
> __dw_pcie_ver_cmp(_pci, TYPE_ ## _type, >=))
>
> +/* DWC PCIe controller capabilities */
> +#define DW_PCIE_CAP_IATU_UNROLL 1
> +
> +#define dw_pcie_cap_is(_pci, _cap) \
> + test_bit(DW_PCIE_CAP_ ## _cap, &(_pci)->caps)
> +
> +#define dw_pcie_cap_set(_pci, _cap) \
> + set_bit(DW_PCIE_CAP_ ## _cap, &(_pci)->caps)
> +
> /* Parameters for the waiting for link up routine */
> #define LINK_WAIT_MAX_RETRIES 10
> #define LINK_WAIT_USLEEP_MIN 90000
> @@ -317,10 +327,10 @@ struct dw_pcie {
> const struct dw_pcie_ops *ops;
> u32 version;
> u32 type;
> + unsigned long caps;
> int num_lanes;
> int link_gen;
> u8 n_fts[2];
> - bool iatu_unroll_enabled: 1;
> };
>
> #define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
> --
> 2.38.1
>
>
--
மணிவண்ணன் சதாசிவம்
