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Date: Mon, 14 Nov 2022 12:31:15 +0530
From: Manivannan Sadhasivam <mani@...nel.org>
To: Serge Semin <Sergey.Semin@...kalelectronics.ru>
Cc: Rob Herring <robh+dt@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Cai Huoqing <cai.huoqing@...ux.dev>,
Robin Murphy <robin.murphy@....com>,
Jingoo Han <jingoohan1@...il.com>,
Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
Lorenzo Pieralisi <lpieralisi@...nel.org>,
Krzysztof Wilczyński <kw@...ux.com>,
Serge Semin <fancer.lancer@...il.com>,
Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
Frank Li <Frank.Li@....com>,
Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
caihuoqing <caihuoqing@...du.com>, Vinod Koul <vkoul@...nel.org>,
linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v7 19/20] PCI: dwc: Introduce generic platform clocks and
resets
On Sun, Nov 13, 2022 at 10:13:00PM +0300, Serge Semin wrote:
> Currently almost each platform driver uses its own resets and clocks
> naming in order to get the corresponding descriptors. It makes the code
> harder to maintain and comprehend especially seeing the DWC PCIe core main
> resets and clocks signals set hasn't changed much for about at least one
> major IP-core release. So in order to organize things around these signals
> we suggest to create a generic interface for them in accordance with the
> naming introduced in the DWC PCIe IP-core reference manual:
>
> Application clocks:
> - "dbi" - data bus interface clock (on some DWC PCIe platforms it's
> referred as "pclk", "pcie", "sys", "ahb", "cfg", "iface",
> "gio", "reg", "pcie_apb_sys");
> - "mstr" - AXI-bus master interface clock (some DWC PCIe glue drivers
> refer to this clock as "port", "bus", "pcie_bus",
> "bus_master/master_bus/axi_m", "pcie_aclk");
> - "slv" - AXI-bus slave interface clock (also called as "port", "bus",
> "pcie_bus", "bus_slave/slave_bus/axi_s", "pcie_aclk",
> "pcie_inbound_axi").
>
> Core clocks:
> - "pipe" - core-PCS PIPE interface clock coming from external PHY (it's
> normally named by the platform drivers as just "pipe");
> - "core" - primary clock of the controller (none of the platform drivers
> declare such a clock but in accordance with the ref. manual
> the devices may have it separately specified);
> - "aux" - auxiliary PMC domain clock (it is named by some platforms as
> "pcie_aux" and just "aux");
> - "ref" - Generic reference clock (it is a generic clock source, which
> can be used as a signal source for multiple interfaces, some
> platforms call it as "ref", "general", "pcie_phy",
> "pcie_phy_ref").
>
> Application resets:
> - "dbi" - Data-bus interface reset (it's CSR interface clock and is
> normally called as "apb" though technically it's not APB but
> DWC PCIe-specific interface);
> - "mstr" - AXI-bus master reset (some platforms call it as "port", "apps",
> "bus", "axi_m");
> - "slv" - ABI-bus slave reset (some platforms call it as "port", "apps",
> "bus", "axi_s").
>
> Core resets:
> - "non-sticky" - non-sticky CSR flags reset;
> - "sticky" - sticky CSR flags reset;
> - "pipe" - PIPE-interface (Core-PCS) logic reset (some platforms
> call it just "pipe");
> - "core" - controller primary reset (resets everything except PMC
> module, some platforms refer to this signal as "soft",
> "pci");
> - "phy" - PCS/PHY block reset (strictly speaking it is normally
> connected to the input of an external block, but the
> reference manual says it must be available for the PMC
> working correctly, some existing platforms call it
> "pciephy", "phy", "link");
> - "hot" - PMC hot reset signal (also called as "sleep");
> - "pwr" - cold reset signal (can be referred as "pwr", "turnoff").
>
> Bus reset:
> - "perst" - PCIe standard signal used to reset the PCIe peripheral
> devices.
>
> As you can see each platform uses it's own naming for basically the same
> set of the signals. In the framework of this commit we suggest to add a
> set of the clocks and reset signals resources, corresponding names and
> identifiers for each denoted entity. At current stage the platforms will
> be able to use the provided infrastructure to automatically request all
> these resources and manipulate with them in the Host/EP init callbacks.
> Alas it isn't that easy to create a common cold/hot reset procedure due to
> too many platform-specifics in the procedure, like the external flags
> exposure and the delays requirement.
>
I'm not really sure if this generification is going to help. For instance, in
Qcom platforms we have some required clocks and some optional clocks and that
too differs with each SoC. For sure you can add logic in the core dwc driver to
handle those cases but that starting to do that will add a pile of mess to the
dwc driver.
IMO, if the dwc driver is not going to use these clocks, like controlling the
clocks/resets, then there is no point in keeping the resource acquiring part in
it.
Thanks,
Mani
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
>
> ---
>
> Changelog v3:
> - Add a method to at least request the generic clocks and resets. (@Rob)
> - Add GPIO-based PERST# signal support.
> ---
> drivers/pci/controller/dwc/pcie-designware.c | 91 ++++++++++++++++++++
> drivers/pci/controller/dwc/pcie-designware.h | 42 +++++++++
> 2 files changed, 133 insertions(+)
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
> index d31f9d41d5cb..1e06ccf2dc9e 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.c
> +++ b/drivers/pci/controller/dwc/pcie-designware.c
> @@ -10,7 +10,9 @@
>
> #include <linux/align.h>
> #include <linux/bitops.h>
> +#include <linux/clk.h>
> #include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/ioport.h>
> #include <linux/of.h>
> #include <linux/of_platform.h>
> @@ -20,11 +22,89 @@
> #include "../../pci.h"
> #include "pcie-designware.h"
>
> +static const char * const dw_pcie_app_clks[DW_PCIE_NUM_APP_CLKS] = {
> + [DW_PCIE_DBI_CLK] = "dbi",
> + [DW_PCIE_MSTR_CLK] = "mstr",
> + [DW_PCIE_SLV_CLK] = "slv",
> +};
> +
> +static const char * const dw_pcie_core_clks[DW_PCIE_NUM_CORE_CLKS] = {
> + [DW_PCIE_PIPE_CLK] = "pipe",
> + [DW_PCIE_CORE_CLK] = "core",
> + [DW_PCIE_AUX_CLK] = "aux",
> + [DW_PCIE_REF_CLK] = "ref",
> +};
> +
> +static const char * const dw_pcie_app_rsts[DW_PCIE_NUM_APP_RSTS] = {
> + [DW_PCIE_DBI_RST] = "dbi",
> + [DW_PCIE_MSTR_RST] = "mstr",
> + [DW_PCIE_SLV_RST] = "slv",
> +};
> +
> +static const char * const dw_pcie_core_rsts[DW_PCIE_NUM_CORE_RSTS] = {
> + [DW_PCIE_NON_STICKY_RST] = "non-sticky",
> + [DW_PCIE_STICKY_RST] = "sticky",
> + [DW_PCIE_CORE_RST] = "core",
> + [DW_PCIE_PIPE_RST] = "pipe",
> + [DW_PCIE_PHY_RST] = "phy",
> + [DW_PCIE_HOT_RST] = "hot",
> + [DW_PCIE_PWR_RST] = "pwr",
> +};
> +
> +static int dw_pcie_get_clocks(struct dw_pcie *pci)
> +{
> + int i, ret;
> +
> + for (i = 0; i < DW_PCIE_NUM_APP_CLKS; i++)
> + pci->app_clks[i].id = dw_pcie_app_clks[i];
> +
> + for (i = 0; i < DW_PCIE_NUM_CORE_CLKS; i++)
> + pci->core_clks[i].id = dw_pcie_core_clks[i];
> +
> + ret = devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_APP_CLKS,
> + pci->app_clks);
> + if (ret)
> + return ret;
> +
> + return devm_clk_bulk_get_optional(pci->dev, DW_PCIE_NUM_CORE_CLKS,
> + pci->core_clks);
> +}
> +
> +static int dw_pcie_get_resets(struct dw_pcie *pci)
> +{
> + int i, ret;
> +
> + for (i = 0; i < DW_PCIE_NUM_APP_RSTS; i++)
> + pci->app_rsts[i].id = dw_pcie_app_rsts[i];
> +
> + for (i = 0; i < DW_PCIE_NUM_CORE_RSTS; i++)
> + pci->core_rsts[i].id = dw_pcie_core_rsts[i];
> +
> + ret = devm_reset_control_bulk_get_optional_shared(pci->dev,
> + DW_PCIE_NUM_APP_RSTS,
> + pci->app_rsts);
> + if (ret)
> + return ret;
> +
> + ret = devm_reset_control_bulk_get_optional_exclusive(pci->dev,
> + DW_PCIE_NUM_CORE_RSTS,
> + pci->core_rsts);
> + if (ret)
> + return ret;
> +
> + pci->pe_rst = devm_gpiod_get_optional(pci->dev, "reset", GPIOD_OUT_HIGH);
> + if (IS_ERR(pci->pe_rst))
> + return PTR_ERR(pci->pe_rst);
> +
> + return 0;
> +}
> +
> int dw_pcie_get_resources(struct dw_pcie *pci)
> {
> struct platform_device *pdev = to_platform_device(pci->dev);
> struct device_node *np = dev_of_node(pci->dev);
> struct resource *res;
> + int ret;
>
> if (!pci->dbi_base) {
> res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dbi");
> @@ -62,6 +142,17 @@ int dw_pcie_get_resources(struct dw_pcie *pci)
> if (!pci->atu_size)
> pci->atu_size = SZ_4K;
>
> + /* LLDD is supposed to manually switch the clocks and resets state */
> + if (dw_pcie_cap_is(pci, REQ_RES)) {
> + ret = dw_pcie_get_clocks(pci);
> + if (ret)
> + return ret;
> +
> + ret = dw_pcie_get_resets(pci);
> + if (ret)
> + return ret;
> + }
> +
> if (pci->link_gen < 1)
> pci->link_gen = of_pci_get_max_link_speed(np);
>
> diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
> index 081f169e6021..393dfb931df6 100644
> --- a/drivers/pci/controller/dwc/pcie-designware.h
> +++ b/drivers/pci/controller/dwc/pcie-designware.h
> @@ -13,10 +13,13 @@
>
> #include <linux/bitfield.h>
> #include <linux/bitops.h>
> +#include <linux/clk.h>
> #include <linux/dma-mapping.h>
> +#include <linux/gpio/consumer.h>
> #include <linux/irq.h>
> #include <linux/msi.h>
> #include <linux/pci.h>
> +#include <linux/reset.h>
>
> #include <linux/pci-epc.h>
> #include <linux/pci-epf.h>
> @@ -45,6 +48,7 @@
> __dw_pcie_ver_cmp(_pci, TYPE_ ## _type, >=))
>
> /* DWC PCIe controller capabilities */
> +#define DW_PCIE_CAP_REQ_RES 0
> #define DW_PCIE_CAP_IATU_UNROLL 1
> #define DW_PCIE_CAP_CDM_CHECK 2
>
> @@ -233,6 +237,39 @@ enum dw_pcie_device_mode {
> DW_PCIE_RC_TYPE,
> };
>
> +enum dw_pcie_app_clk {
> + DW_PCIE_DBI_CLK,
> + DW_PCIE_MSTR_CLK,
> + DW_PCIE_SLV_CLK,
> + DW_PCIE_NUM_APP_CLKS
> +};
> +
> +enum dw_pcie_core_clk {
> + DW_PCIE_PIPE_CLK,
> + DW_PCIE_CORE_CLK,
> + DW_PCIE_AUX_CLK,
> + DW_PCIE_REF_CLK,
> + DW_PCIE_NUM_CORE_CLKS
> +};
> +
> +enum dw_pcie_app_rst {
> + DW_PCIE_DBI_RST,
> + DW_PCIE_MSTR_RST,
> + DW_PCIE_SLV_RST,
> + DW_PCIE_NUM_APP_RSTS
> +};
> +
> +enum dw_pcie_core_rst {
> + DW_PCIE_NON_STICKY_RST,
> + DW_PCIE_STICKY_RST,
> + DW_PCIE_CORE_RST,
> + DW_PCIE_PIPE_RST,
> + DW_PCIE_PHY_RST,
> + DW_PCIE_HOT_RST,
> + DW_PCIE_PWR_RST,
> + DW_PCIE_NUM_CORE_RSTS
> +};
> +
> struct dw_pcie_host_ops {
> int (*host_init)(struct dw_pcie_rp *pp);
> void (*host_deinit)(struct dw_pcie_rp *pp);
> @@ -332,6 +369,11 @@ struct dw_pcie {
> int num_lanes;
> int link_gen;
> u8 n_fts[2];
> + struct clk_bulk_data app_clks[DW_PCIE_NUM_APP_CLKS];
> + struct clk_bulk_data core_clks[DW_PCIE_NUM_CORE_CLKS];
> + struct reset_control_bulk_data app_rsts[DW_PCIE_NUM_APP_RSTS];
> + struct reset_control_bulk_data core_rsts[DW_PCIE_NUM_CORE_RSTS];
> + struct gpio_desc *pe_rst;
> };
>
> #define to_dw_pcie_from_pp(port) container_of((port), struct dw_pcie, pp)
> --
> 2.38.1
>
>
--
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