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Message-ID: <d323007c6bf14cb9f90a497a26b66dac151164fc.camel@amazon.com>
Date: Sun, 21 Jul 2019 15:08:18 +0000
From: "Chocron, Jonathan" <jonnyc@...zon.com>
To: "jingoohan1@...il.com" <jingoohan1@...il.com>,
"mark.rutland@....com" <mark.rutland@....com>,
"lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
"Gustavo.Pimentel@...opsys.com" <Gustavo.Pimentel@...opsys.com>,
"bhelgaas@...gle.com" <bhelgaas@...gle.com>,
"robh+dt@...nel.org" <robh+dt@...nel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"Woodhouse, David" <dwmw@...zon.co.uk>,
"Hanoch, Uri" <hanochu@...zon.com>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"Wasserstrom, Barak" <barakw@...zon.com>,
"Saidi, Ali" <alisaidi@...zon.com>,
"Hawa, Hanna" <hhhawa@...zon.com>,
"Shenhar, Talel" <talel@...zon.com>,
"Krupnik, Ronen" <ronenk@...zon.com>,
"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
"benh@...nel.crashing.org" <benh@...nel.crashing.org>
Subject: Re: [PATCH v2 6/8] PCI: al: Add support for DW based driver type
On Fri, 2019-07-19 at 08:55 +0000, Gustavo Pimentel wrote:
> On Thu, Jul 18, 2019 at 10:47:16, Jonathan Chocron <jonnyc@...zon.com
> >
> wrote:
>
> > This driver is DT based and utilizes the DesignWare APIs.
> > It allows using a smaller ECAM range for a larger bus range -
> > usually an entire bus uses 1MB of address space, but the driver
> > can use it for a larger number of buses.
> >
> > All link initializations are handled by the boot FW.
> >
> > Signed-off-by: Jonathan Chocron <jonnyc@...zon.com>
> > ---
> > drivers/pci/controller/dwc/Kconfig | 12 +
> > drivers/pci/controller/dwc/pcie-al.c | 373
> > +++++++++++++++++++++++++++
> > 2 files changed, 385 insertions(+)
> >
> > diff --git a/drivers/pci/controller/dwc/Kconfig
> > b/drivers/pci/controller/dwc/Kconfig
> > index 6ea778ae4877..3c6094cbcc3b 100644
> > --- a/drivers/pci/controller/dwc/Kconfig
> > +++ b/drivers/pci/controller/dwc/Kconfig
> > @@ -230,4 +230,16 @@ config PCIE_UNIPHIER
> > Say Y here if you want PCIe controller support on UniPhier
> > SoCs.
> > This driver supports LD20 and PXs3 SoCs.
> >
> > +config PCIE_AL
> > + bool "Amazon Annapurna Labs PCIe controller"
> > + depends on OF && (ARM64 || COMPILE_TEST)
> > + depends on PCI_MSI_IRQ_DOMAIN
> > + select PCIE_DW_HOST
> > + help
> > + Say Y here to enable support of the Amazon's Annapurna Labs
> > PCIe
> > + controller IP on Amazon SoCs. The PCIe controller uses the
> > DesignWare
> > + core plus Annapurna Labs proprietary hardware wrappers. This
> > is
> > + required only for DT-based platforms. ACPI platforms with the
> > + Annapurna Labs PCIe controller don't need to enable this.
> > +
> > endmenu
> > diff --git a/drivers/pci/controller/dwc/pcie-al.c
> > b/drivers/pci/controller/dwc/pcie-al.c
> > index 3ab58f0584a8..40555532fb9a 100644
> > --- a/drivers/pci/controller/dwc/pcie-al.c
> > +++ b/drivers/pci/controller/dwc/pcie-al.c
> > @@ -91,3 +91,376 @@ struct pci_ecam_ops al_pcie_ops = {
> > };
> >
> > #endif /* defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS) */
> > +
> > +#ifdef CONFIG_PCIE_AL
> > +
> > +#include <linux/of_pci.h>
> > +#include "pcie-designware.h"
> > +
> > +#define AL_PCIE_REV_ID_2 2
> > +#define AL_PCIE_REV_ID_3 3
> > +#define AL_PCIE_REV_ID_4 4
> > +
> > +#define AXI_BASE_OFFSET 0x0
> > +
> > +#define DEVICE_ID_OFFSET 0x16c
> > +
> > +#define DEVICE_REV_ID 0x0
> > +#define DEVICE_REV_ID_DEV_ID_MASK GENMASK(31, 16)
> > +
> > +#define DEVICE_REV_ID_DEV_ID_X4 0
> > +#define DEVICE_REV_ID_DEV_ID_X8 2
> > +#define DEVICE_REV_ID_DEV_ID_X16 4
> > +
> > +#define OB_CTRL_REV1_2_OFFSET 0x0040
> > +#define OB_CTRL_REV3_5_OFFSET 0x0030
> > +
> > +#define CFG_TARGET_BUS 0x0
> > +#define CFG_TARGET_BUS_MASK_MASK GENMASK(7, 0)
> > +#define CFG_TARGET_BUS_BUSNUM_MASK GENMASK(15, 8)
> > +
> > +#define CFG_CONTROL 0x4
> > +#define CFG_CONTROL_SUBBUS_MASK GENMASK(15, 8)
> > +#define CFG_CONTROL_SEC_BUS_MASK GENMASK(23, 16)
> > +
> > +struct al_pcie_reg_offsets {
> > + unsigned int ob_ctrl;
> > +};
> > +
> > +struct al_pcie_target_bus_cfg {
> > + u8 reg_val;
> > + u8 reg_mask;
> > + u8 ecam_mask;
> > +};
> > +
> > +struct al_pcie {
> > + struct dw_pcie *pci;
> > + void __iomem *controller_base; /* base of PCIe unit (not DW
> > core) */
> > + struct device *dev;
> > + resource_size_t ecam_size;
> > + unsigned int controller_rev_id;
> > + struct al_pcie_reg_offsets reg_offsets;
> > + struct al_pcie_target_bus_cfg target_bus_cfg;
> > +};
> > +
> > +#define PCIE_ECAM_DEVFN(x) (((x) & 0xff) << 12)
> > +
> > +#define to_al_pcie(x) dev_get_drvdata((x)->dev)
> > +
> > +static int al_pcie_rev_id_get(struct al_pcie *pcie, unsigned int
> > *rev_id)
> > +{
> > + void __iomem *dev_rev_id_addr;
> > + u32 dev_rev_id;
> > +
> > + dev_rev_id_addr = (void __iomem *)((uintptr_t)pcie-
> > >controller_base +
> > + AXI_BASE_OFFSET + DEVICE_ID_OFFSET +
> > DEVICE_REV_ID);
> > +
> > + dev_rev_id = FIELD_GET(DEVICE_REV_ID_DEV_ID_MASK,
> > + readl(dev_rev_id_addr));
> > + switch (dev_rev_id) {
> > + case DEVICE_REV_ID_DEV_ID_X4:
> > + *rev_id = AL_PCIE_REV_ID_2;
> > + break;
> > + case DEVICE_REV_ID_DEV_ID_X8:
> > + *rev_id = AL_PCIE_REV_ID_3;
> > + break;
> > + case DEVICE_REV_ID_DEV_ID_X16:
> > + *rev_id = AL_PCIE_REV_ID_4;
> > + break;
> > + default:
> > + dev_err(pcie->dev, "Unsupported dev_rev_id (0x%x)\n",
> > + dev_rev_id);
> > + return -EINVAL;
> > + }
> > +
> > + dev_dbg(pcie->dev, "dev_rev_id: 0x%x\n", dev_rev_id);
>
> Consider s/dev_dbg/pci_dbg/g
>
There is no struct pci_dev context (the dev belongs to the
platform_device).
> > +
> > + return 0;
> > +}
> > +
> > +static int al_pcie_reg_offsets_set(struct al_pcie *pcie)
> > +{
> > + switch (pcie->controller_rev_id) {
> > + case AL_PCIE_REV_ID_2:
> > + pcie->reg_offsets.ob_ctrl = OB_CTRL_REV1_2_OFFSET;
> > + break;
> > + case AL_PCIE_REV_ID_3:
> > + case AL_PCIE_REV_ID_4:
> > + pcie->reg_offsets.ob_ctrl = OB_CTRL_REV3_5_OFFSET;
> > + break;
> > + default:
> > + dev_err(pcie->dev, "Unsupported controller rev_id:
> > 0x%x\n",
> > + pcie->controller_rev_id);
>
> Consider s/dev_err/pci_err/g
>
Same as above.
> > + return -EINVAL;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static inline void al_pcie_target_bus_set(struct al_pcie *pcie,
> > + u8 target_bus,
> > + u8 mask_target_bus)
> > +{
> > + void __iomem *cfg_control_addr;
> > + u32 reg;
> > +
> > + reg = FIELD_PREP(CFG_TARGET_BUS_MASK_MASK, mask_target_bus) |
> > + FIELD_PREP(CFG_TARGET_BUS_BUSNUM_MASK, target_bus);
> > +
> > + cfg_control_addr = (void __iomem *)((uintptr_t)pcie-
> > >controller_base +
> > + AXI_BASE_OFFSET + pcie->reg_offsets.ob_ctrl
> > +
> > + CFG_TARGET_BUS);
> > +
> > + writel(reg, cfg_control_addr);
>
> From what I'm seeing you commonly use writel() and readl() with a
> common
> base address, such as pcie->controller_base + AXI_BASE_OFFSET.
> I'd suggest to creating a writel and readl with that offset built-in.
>
I prefer to keep it generic, since in future revisions we might want to
access regs which are not in the AXI region. You think I should add
wrappers which simply hide the pcie->controller_base part?
> > +}
> > +
> > +static void __iomem *al_pcie_conf_addr_map(struct al_pcie *pcie,
> > + unsigned int busnr,
> > + unsigned int devfn)
> > +{
> > + void __iomem *pci_base_addr;
>
> Consider passing this variable declaration to the bottom, following
> the
> reverse tree order.
>
Done. Moved 'struct pcie_port *pp' as well.
> > + struct pcie_port *pp = &pcie->pci->pp;
> > + struct al_pcie_target_bus_cfg *target_bus_cfg = &pcie-
> > >target_bus_cfg;
> > + unsigned int busnr_ecam = busnr & target_bus_cfg->ecam_mask;
> > + unsigned int busnr_reg = busnr & target_bus_cfg->reg_mask;
> > +
> > + pci_base_addr = (void __iomem *)((uintptr_t)pp->va_cfg0_base +
> > + (busnr_ecam << 20) +
> > + PCIE_ECAM_DEVFN(devfn));
> > +
> > + if (busnr_reg != target_bus_cfg->reg_val) {
> > + dev_dbg(pcie->pci->dev, "Changing target bus busnum val
> > from 0x%x to 0x%x\n",
> > + target_bus_cfg->reg_val, busnr_reg);
> > + target_bus_cfg->reg_val = busnr_reg;
> > + al_pcie_target_bus_set(pcie,
> > + target_bus_cfg->reg_val,
> > + target_bus_cfg->reg_mask);
> > + }
> > +
> > + return pci_base_addr;
> > +}
> > +
> > +static int al_pcie_rd_other_conf(struct pcie_port *pp, struct
> > pci_bus *bus,
> > + unsigned int devfn, int where, int
> > size,
> > + u32 *val)
> > +{
> > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > + struct al_pcie *pcie = to_al_pcie(pci);
> > + unsigned int busnr = bus->number;
> > + void __iomem *pci_addr;
> > + int rc;
> > +
> > + pci_addr = al_pcie_conf_addr_map(pcie, busnr, devfn);
> > +
> > + rc = dw_pcie_read(pci_addr + where, size, val);
> > +
> > + dev_dbg(pci->dev, "%d-byte config read from %04x:%02x:%02x.%d
> > offset 0x%x (pci_addr: 0x%px) - val:0x%x\n",
> > + size, pci_domain_nr(bus), bus->number,
> > + PCI_SLOT(devfn), PCI_FUNC(devfn), where,
> > + (pci_addr + where), *val);
> > +
> > + return rc;
> > +}
> > +
> > +static int al_pcie_wr_other_conf(struct pcie_port *pp, struct
> > pci_bus *bus,
> > + unsigned int devfn, int where, int
> > size,
> > + u32 val)
> > +{
> > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > + struct al_pcie *pcie = to_al_pcie(pci);
> > + unsigned int busnr = bus->number;
> > + void __iomem *pci_addr;
> > + int rc;
> > +
> > + pci_addr = al_pcie_conf_addr_map(pcie, busnr, devfn);
> > +
> > + rc = dw_pcie_write(pci_addr + where, size, val);
> > +
> > + dev_err(pci->dev, "%d-byte config write to %04x:%02x:%02x.%d
> > offset 0x%x (pci_addr: 0x%px) - val:0x%x\n",
> > + size, pci_domain_nr(bus), bus->number,
> > + PCI_SLOT(devfn), PCI_FUNC(devfn), where,
> > + (pci_addr + where), val);
> > +
> > + return rc;
> > +}
> > +
> > +static int al_pcie_config_prepare(struct al_pcie *pcie)
> > +{
> > + struct al_pcie_target_bus_cfg *target_bus_cfg;
> > + struct pcie_port *pp = &pcie->pci->pp;
> > + unsigned int ecam_bus_mask;
> > + u8 secondary_bus;
> > + u8 subordinate_bus;
> > + void __iomem *cfg_control_addr;
> > + u32 cfg_control;
> > + u32 reg;
> > +
> > + target_bus_cfg = &pcie->target_bus_cfg;
> > +
> > + ecam_bus_mask = (pcie->ecam_size >> 20) - 1;
> > + if (ecam_bus_mask > 255) {
> > + dev_warn(pcie->dev, "ECAM window size is larger than
> > 256MB. Cutting off at 256\n");
> > + ecam_bus_mask = 255;
> > + }
> > +
> > + /* This portion is taken from the transaction address */
> > + target_bus_cfg->ecam_mask = ecam_bus_mask;
> > + /* This portion is taken from the cfg_target_bus reg */
> > + target_bus_cfg->reg_mask = ~target_bus_cfg->ecam_mask;
> > + target_bus_cfg->reg_val = pp->busn->start & target_bus_cfg-
> > >reg_mask;
> > +
> > + al_pcie_target_bus_set(pcie, target_bus_cfg->reg_val,
> > + target_bus_cfg->reg_mask);
> > +
> > + secondary_bus = pp->busn->start + 1;
> > + subordinate_bus = pp->busn->end;
> > +
> > + /* Set the valid values of secondary and subordinate buses */
> > + cfg_control_addr = pcie->controller_base + AXI_BASE_OFFSET +
> > + pcie->reg_offsets.ob_ctrl + CFG_CONTROL;
> > +
> > + cfg_control = readl(cfg_control_addr);
> > +
> > + reg = cfg_control &
> > + ~(CFG_CONTROL_SEC_BUS_MASK | CFG_CONTROL_SUBBUS_MASK);
> > +
> > + reg |= FIELD_PREP(CFG_CONTROL_SUBBUS_MASK, subordinate_bus) |
> > + FIELD_PREP(CFG_CONTROL_SEC_BUS_MASK, secondary_bus);
> > +
> > + writel(reg, cfg_control_addr);
> > +
> > + return 0;
> > +}
> > +
> > +static int al_pcie_host_init(struct pcie_port *pp)
> > +{
> > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > + struct al_pcie *pcie = to_al_pcie(pci);
> > + int link_up;
> > + int rc;
> > +
> > + link_up = dw_pcie_link_up(pci);
> > + if (!link_up) {
> > + dev_err(pci->dev, "link is not up!\n");
> > + return -ENOLINK;
> > + }
> > +
> > + dev_info(pci->dev, "link is up\n");
>
> Consider s/dev_info/pci_info/g
>
Same as the response above.
> > +
> > + rc = al_pcie_rev_id_get(pcie, &pcie->controller_rev_id);
> > + if (rc)
> > + return rc;
> > +
> > + rc = al_pcie_reg_offsets_set(pcie);
> > + if (rc)
> > + return rc;
> > +
> > + rc = al_pcie_config_prepare(pcie);
> > + if (rc)
> > + return rc;
> > +
> > + return 0;
> > +}
> > +
> > +static const struct dw_pcie_host_ops al_pcie_host_ops = {
> > + .rd_other_conf = al_pcie_rd_other_conf,
> > + .wr_other_conf = al_pcie_wr_other_conf,
> > + .host_init = al_pcie_host_init,
> > +};
> > +
> > +static int al_add_pcie_port(struct pcie_port *pp,
> > + struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + int ret;
> > +
> > + pp->ops = &al_pcie_host_ops;
> > +
> > + ret = dw_pcie_host_init(pp);
> > + if (ret) {
> > + dev_err(dev, "failed to initialize host\n");
> > + return ret;
> > + }
> > +
> > + return 0;
> > +}
> > +
> > +static const struct dw_pcie_ops dw_pcie_ops = {
> > +};
> > +
> > +static int al_pcie_probe(struct platform_device *pdev)
> > +{
> > + struct device *dev = &pdev->dev;
> > + struct al_pcie *al_pcie;
> > + struct dw_pcie *pci;
> > + struct resource *dbi_res;
> > + struct resource *controller_res;
> > + struct resource *ecam_res;
> > + int ret;
>
> Please sort the variables following the reverse tree order.
>
Done.
I'd think that it would make sense to group variables which have a
common characteristic (e.g. resources read from the DT), even if it
mildly breaks the convention (as long as the general frame is longest
to shortest). Does this sound ok?
BTW, I couldn't find any documentation regarding the reverse-tree
convention, do you have a pointer to some?
> > +
> > + al_pcie = devm_kzalloc(dev, sizeof(*al_pcie), GFP_KERNEL);
> > + if (!al_pcie)
> > + return -ENOMEM;
> > +
> > + pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
> > + if (!pci)
> > + return -ENOMEM;
> > +
> > + pci->dev = dev;
> > + pci->ops = &dw_pcie_ops;
> > +
> > + al_pcie->pci = pci;
> > + al_pcie->dev = dev;
> > +
> > + dbi_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > "dbi");
> > + pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_res);
> > + if (IS_ERR(pci->dbi_base)) {
> > + dev_err(dev, "couldn't remap dbi base %pR\n", dbi_res);
> > + return PTR_ERR(pci->dbi_base);
> > + }
> > +
> > + ecam_res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> > "config");
> > + if (!ecam_res) {
> > + dev_err(dev, "couldn't find 'config' reg in DT\n");
> > + return -ENOENT;
> > + }
> > + al_pcie->ecam_size = resource_size(ecam_res);
> > +
> > + controller_res = platform_get_resource_byname(pdev,
> > IORESOURCE_MEM,
> > + "controller");
> > + al_pcie->controller_base = devm_ioremap_resource(dev,
> > controller_res);
> > + if (IS_ERR(al_pcie->controller_base)) {
> > + dev_err(dev, "couldn't remap controller base %pR\n",
> > + controller_res);
> > + return PTR_ERR(al_pcie->controller_base);
> > + }
> > +
> > + dev_dbg(dev, "From DT: dbi_base: %pR, controller_base: %pR\n",
> > + dbi_res, controller_res);
> > +
> > + platform_set_drvdata(pdev, al_pcie);
> > +
> > + ret = al_add_pcie_port(&pci->pp, pdev);
> > + if (ret)
> > + return ret;
> > +
> > + return 0;
>
> Those operations are redundant, aren't they? They can be replaced
> just
> by:
>
> return ret;
>
Ack.
> > +}
> > +
> > +static const struct of_device_id al_pcie_of_match[] = {
> > + { .compatible = "amazon,al-pcie",
> > + },
> > + {},
> > +};
> > +
> > +static struct platform_driver al_pcie_driver = {
> > + .driver = {
> > + .name = "al-pcie",
> > + .of_match_table = al_pcie_of_match,
> > + .suppress_bind_attrs = true,
> > + },
> > + .probe = al_pcie_probe,
> > +};
> > +builtin_platform_driver(al_pcie_driver);
> > +
> > +#endif /* CONFIG_PCIE_AL*/
> > --
> > 2.17.1
>
>
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