| Message ID | 20190710164519.17883-7-jonnyc@amazon.com |
|---|---|
| State | Superseded |
| Delegated to: | Lorenzo Pieralisi |
| Headers | show |
| Series | Amazon's Annapurna Labs DT-based PCIe host controller driver | expand |
On Thu, Jul 11, 2019 at 05:57:05PM +0300, Jonathan Chocron 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@amazon.com> > --- > drivers/pci/controller/dwc/Kconfig | 11 + > drivers/pci/controller/dwc/pcie-al.c | 397 +++++++++++++++++++++++++++ > 2 files changed, 408 insertions(+) > > diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig > index a6ce1ee51b4c..51da9cb219aa 100644 > --- a/drivers/pci/controller/dwc/Kconfig > +++ b/drivers/pci/controller/dwc/Kconfig > @@ -230,4 +230,15 @@ 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 Annapurna Labs PCIe controller IP > + on Amazon SoCs. > + The PCIe controller uses the DesignWare core plus > + Amazon-specific hardware wrappers. Is this one paragraph or two? This should mention the fact that only DT platforms need CONFIG_PCIE_AL. ACPI platforms with the Annapurna Labs PCIe controller don't need this. > + > endmenu > diff --git a/drivers/pci/controller/dwc/pcie-al.c b/drivers/pci/controller/dwc/pcie-al.c > index 3ab58f0584a8..2742a0895aab 100644 > --- a/drivers/pci/controller/dwc/pcie-al.c > +++ b/drivers/pci/controller/dwc/pcie-al.c > @@ -91,3 +91,400 @@ 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 > + > +/* The AXI regs are always at the beginning of the PCIE controller reg space. */ > +#define AXI_BASE_OFFSET 0x0 > + > +#define DEVICE_ID_OFFSET 0x16c > + > +#define DEVICE_REV_ID 0x0 > +#define DEVICE_REV_ID_DEV_ID_MASK 0xFFFF0000 > +#define DEVICE_REV_ID_DEV_ID_SHIFT 16 > + > +#define DEVICE_REV_ID_DEV_ID_X4 (0 << DEVICE_REV_ID_DEV_ID_SHIFT) > +#define DEVICE_REV_ID_DEV_ID_X8 (2 << DEVICE_REV_ID_DEV_ID_SHIFT) > +#define DEVICE_REV_ID_DEV_ID_X16 (4 << DEVICE_REV_ID_DEV_ID_SHIFT) > + > +/* The ob_ctrl offset inside the axi regs is different between revisions. > + */ s/axi/AXI/ to be consistent. Fix comment style (either single-line with "/* ... */" or multi-line with "/*" on first line and "*/" on last line). > +#define OB_CTRL_REV1_2_OFFSET 0x0040 > +#define OB_CTRL_REV3_5_OFFSET 0x0030 > + > +#define CFG_TARGET_BUS 0x0 > +#define CFG_TARGET_BUS_MASK_SHIFT 0 > +#define CFG_TARGET_BUS_BUSNUM_SHIFT 8 > + > +#define CFG_CONTROL 0x4 > +#define CFG_CONTROL_SUBBUS_MASK 0x0000FF00 > +#define CFG_CONTROL_SUBBUS_SHIFT 8 > +#define CFG_CONTROL_SEC_BUS_MASK 0x00FF0000 > +#define CFG_CONTROL_SEC_BUS_SHIFT 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) */ > + void __iomem *dbi_base; I *guess* this is different from the dw_pcie.dbi_base? > + resource_size_t ecam_size; > + struct device *dev; > + 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) I think al_pcie_rev_id_get() and al_pcie_reg_offsets_set() are more complicated than necessary, at least for the current code. All you're really using is something like this: static void al_pcie_rev_id_get(...) { ... switch (dev_rev_id) { case DEVICE_REV_ID_DEV_ID_X4: pcie->reg_offsets.ob_ctrl = OB_CTRL_REV1_2_OFFSET; break; case DEVICE_REV_ID_DEV_ID_X8: case DEVICE_REV_ID_DEV_ID_X16: pcie->reg_offsets.ob_ctrl = OB_CTRL_REV3_5_OFFSET; break; default: dev_err("unsupported rev_id\n"); break; } } > +{ > + 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 = readl(dev_rev_id_addr) & DEVICE_REV_ID_DEV_ID_MASK; > + > + 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%08x)\n", > + dev_rev_id); > + return -EINVAL; > + } > + > + dev_dbg(pcie->dev, "dev_rev_id: 0x%08x\n", dev_rev_id); > + > + 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); > + 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 = (target_bus << CFG_TARGET_BUS_BUSNUM_SHIFT) | > + 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); > +} > + > +static void __iomem *al_pcie_conf_addr_map(struct al_pcie *pcie, > + unsigned int busnr, > + unsigned int devfn) > +{ > + void __iomem *pci_base_addr; > + 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 %d to %d\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) Rewrap to use fewer lines. > +{ > + 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 %#x (pci_addr: 0x%p) - 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_dbg(pci->dev, "%d-byte config write to %04x:%02x:%02x.%d offset %#x (pci_addr: 0x%p) - 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 = 0; Why is this initialized? It doesn't look like it can be used before being set. > + 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) | > + (secondary_bus << CFG_CONTROL_SEC_BUS_SHIFT); > + reg = (reg & ~CFG_CONTROL_SUBBUS_MASK) | > + (subordinate_bus << CFG_CONTROL_SUBBUS_SHIFT); > + > + 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 = 0; > + u32 reg = 0; Why initialize link_up and reg? > + int rc; > + > + reg = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE); > + if (reg != PCI_HEADER_TYPE_BRIDGE) { > + dev_err(pci->dev, "PCIe controller is not set to bridge type (%d)!\n", > + reg); > + return -EIO; > + } > + > + link_up = dw_pcie_link_up(pci); > + if (!link_up) { > + dev_err(pci->dev, "link in not up!\n"); s/in/is/ > + return -ENOLINK; > + } > + > + dev_info(pci->dev, "link is up\n"); > + > + 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; > + > + 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 %p\n", dbi_res); %pR (see below). > + 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); Several of these function calls would fit on one line, or at least fewer than they currently use. > + if (IS_ERR(al_pcie->controller_base)) { > + dev_err(dev, "couldn't remap controller base %p\n", > + controller_res); Use %pR. I think this %p prints the address of the struct resource, not the address you tried to map. > + return PTR_ERR(al_pcie->controller_base); > + } > + > + dev_dbg(dev, "From DT: dbi_base: 0x%llx, controller_base: 0x%llx\n", > + dbi_res->start, controller_res->start); Use %pR instead of printing dbi_res->start, controller_res->start. > + > + platform_set_drvdata(pdev, al_pcie); > + > + ret = al_add_pcie_port(&pci->pp, pdev); > + if (ret) > + return ret; > + > + return 0; > +} > + > +static const struct of_device_id al_pcie_of_match[] = { > + { .compatible = "amazon,al-pcie", > + .data = NULL, ".data = NULL" is unnecessary. > + }, > + {}, > +}; > + > +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 > >
On Fri, 2019-07-12 at 08:42 -0500, Bjorn Helgaas wrote: > On Thu, Jul 11, 2019 at 05:57:05PM +0300, Jonathan Chocron 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@amazon.com> > > --- > > drivers/pci/controller/dwc/Kconfig | 11 + > > drivers/pci/controller/dwc/pcie-al.c | 397 > > +++++++++++++++++++++++++++ > > 2 files changed, 408 insertions(+) > > > > diff --git a/drivers/pci/controller/dwc/Kconfig > > b/drivers/pci/controller/dwc/Kconfig > > index a6ce1ee51b4c..51da9cb219aa 100644 > > --- a/drivers/pci/controller/dwc/Kconfig > > +++ b/drivers/pci/controller/dwc/Kconfig > > @@ -230,4 +230,15 @@ 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 Annapurna Labs PCIe > > controller IP > > + on Amazon SoCs. > > + The PCIe controller uses the DesignWare core plus > > + Amazon-specific hardware wrappers. > > Is this one paragraph or two? > This was originally a single paragraph, but I hacked it a bit to pass the checkpatch minimum 4 line description requirement :) > This should mention the fact that only DT platforms need > CONFIG_PCIE_AL. ACPI platforms with the Annapurna Labs PCIe > controller don't need this. > No problem, will add. The reason I didn't explicitly state this is because I didn't see it mentioned in PCIE_HISI, which has similar support of both ACPI and DT-based drivers. > > + > > endmenu > > diff --git a/drivers/pci/controller/dwc/pcie-al.c > > b/drivers/pci/controller/dwc/pcie-al.c > > index 3ab58f0584a8..2742a0895aab 100644 > > --- a/drivers/pci/controller/dwc/pcie-al.c > > +++ b/drivers/pci/controller/dwc/pcie-al.c > > @@ -91,3 +91,400 @@ 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 > > + > > +/* The AXI regs are always at the beginning of the PCIE controller > > reg space. */ > > +#define AXI_BASE_OFFSET 0x0 > > + > > +#define DEVICE_ID_OFFSET 0x16c > > + > > +#define DEVICE_REV_ID 0x0 > > +#define DEVICE_REV_ID_DEV_ID_MASK 0xFFFF0000 > > +#define DEVICE_REV_ID_DEV_ID_SHIFT 16 > > + > > +#define DEVICE_REV_ID_DEV_ID_X4 (0 << > > DEVICE_REV_ID_DEV_ID_SHIFT) > > +#define DEVICE_REV_ID_DEV_ID_X8 (2 << > > DEVICE_REV_ID_DEV_ID_SHIFT) > > +#define DEVICE_REV_ID_DEV_ID_X16 (4 << > > DEVICE_REV_ID_DEV_ID_SHIFT) > > + > > +/* The ob_ctrl offset inside the axi regs is different between > > revisions. > > + */ > > s/axi/AXI/ to be consistent. > Ack. > Fix comment style (either single-line with "/* ... */" or multi-line > with "/*" on first line and "*/" on last line). > Ack. I'd expect checkpatch to catch that, no? > > +#define OB_CTRL_REV1_2_OFFSET 0x0040 > > +#define OB_CTRL_REV3_5_OFFSET 0x0030 > > + > > +#define CFG_TARGET_BUS 0x0 > > +#define CFG_TARGET_BUS_MASK_SHIFT 0 > > +#define CFG_TARGET_BUS_BUSNUM_SHIFT 8 > > + > > +#define CFG_CONTROL 0x4 > > +#define CFG_CONTROL_SUBBUS_MASK 0x0000FF00 > > +#define CFG_CONTROL_SUBBUS_SHIFT 8 > > +#define CFG_CONTROL_SEC_BUS_MASK 0x00FF0000 > > +#define CFG_CONTROL_SEC_BUS_SHIFT 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) */ > > + void __iomem *dbi_base; > > I *guess* this is different from the dw_pcie.dbi_base? Removed (leftover from an early revision). > > > + resource_size_t ecam_size; > > + struct device *dev; > > + 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) > > I think al_pcie_rev_id_get() and al_pcie_reg_offsets_set() are more > complicated than necessary, at least for the current code. All > you're > really using is something like this: > > static void al_pcie_rev_id_get(...) > { > ... > switch (dev_rev_id) { > case DEVICE_REV_ID_DEV_ID_X4: > pcie->reg_offsets.ob_ctrl = OB_CTRL_REV1_2_OFFSET; > break; > case DEVICE_REV_ID_DEV_ID_X8: > case DEVICE_REV_ID_DEV_ID_X16: > pcie->reg_offsets.ob_ctrl = OB_CTRL_REV3_5_OFFSET; > break; > default: > dev_err("unsupported rev_id\n"); > break; > } > } > I understand, this was more of a future preparation, in case a configuration would be different for a future HW revision. So you think I should entirely remove the controller_rev_id from the al_pcie context, or simply unify the logic into a single "al_pcie_rev_id_setup()" func? > > +{ > > + 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 = readl(dev_rev_id_addr) & > > DEVICE_REV_ID_DEV_ID_MASK; > > + > > + 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%08x)\n", > > + dev_rev_id); > > + return -EINVAL; > > + } > > + > > + dev_dbg(pcie->dev, "dev_rev_id: 0x%08x\n", dev_rev_id); > > + > > + 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); > > + 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 = (target_bus << CFG_TARGET_BUS_BUSNUM_SHIFT) | > > + 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); > > +} > > + > > +static void __iomem *al_pcie_conf_addr_map(struct al_pcie *pcie, > > + unsigned int busnr, > > + unsigned int devfn) > > +{ > > + void __iomem *pci_base_addr; > > + 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 %d to %d\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) > > Rewrap to use fewer lines. > Done. > > +{ > > + 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 %#x (pci_addr: 0x%p) - val:0x%x\n", Do you think I should change the %p here to %px? > > + 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_dbg(pci->dev, "%d-byte config write to %04x:%02x:%02x.%d > > offset %#x (pci_addr: 0x%p) - 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 = 0; > > Why is this initialized? It doesn't look like it can be used before > being set. Removed initialization. > > > + 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) | > > + (secondary_bus << CFG_CONTROL_SEC_BUS_SHIFT); > > + reg = (reg & ~CFG_CONTROL_SUBBUS_MASK) | > > + (subordinate_bus << CFG_CONTROL_SUBBUS_SHIFT); > > + > > + 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 = 0; > > + u32 reg = 0; > > Why initialize link_up and reg? > Removed initialization. > > + int rc; > > + > > + reg = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE); > > + if (reg != PCI_HEADER_TYPE_BRIDGE) { > > + dev_err(pci->dev, "PCIe controller is not set to bridge > > type (%d)!\n", > > + reg); > > + return -EIO; > > + } > > + Removing this validation as it is done generically in PATCH 7/8. > > + link_up = dw_pcie_link_up(pci); > > + if (!link_up) { > > + dev_err(pci->dev, "link in not up!\n"); > > s/in/is/ Ack. > > > + return -ENOLINK; > > + } > > + > > + dev_info(pci->dev, "link is up\n"); > > + > > + 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; > > + > > + 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 %p\n", dbi_res); > > %pR (see below). > Fixed. > > + 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 > > ); > > Several of these function calls would fit on one line, or at least > fewer than they currently use. > Fixed. > > + if (IS_ERR(al_pcie->controller_base)) { > > + dev_err(dev, "couldn't remap controller base %p\n", > > + controller_res); > > Use %pR. I think this %p prints the address of the struct resource, > not the address you tried to map. > Fixed. > > + return PTR_ERR(al_pcie->controller_base); > > + } > > + > > + dev_dbg(dev, "From DT: dbi_base: 0x%llx, controller_base: > > 0x%llx\n", > > + dbi_res->start, controller_res->start); > > Use %pR instead of printing dbi_res->start, controller_res->start. > Done. > > + > > + platform_set_drvdata(pdev, al_pcie); > > + > > + ret = al_add_pcie_port(&pci->pp, pdev); > > + if (ret) > > + return ret; > > + > > + return 0; > > +} > > + > > +static const struct of_device_id al_pcie_of_match[] = { > > + { .compatible = "amazon,al-pcie", > > + .data = NULL, > > ".data = NULL" is unnecessary. > Done. > > + }, > > + {}, > > +}; > > + > > +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 > >
diff --git a/drivers/pci/controller/dwc/Kconfig b/drivers/pci/controller/dwc/Kconfig index a6ce1ee51b4c..51da9cb219aa 100644 --- a/drivers/pci/controller/dwc/Kconfig +++ b/drivers/pci/controller/dwc/Kconfig @@ -230,4 +230,15 @@ 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 Annapurna Labs PCIe controller IP + on Amazon SoCs. + The PCIe controller uses the DesignWare core plus + Amazon-specific hardware wrappers. + endmenu diff --git a/drivers/pci/controller/dwc/pcie-al.c b/drivers/pci/controller/dwc/pcie-al.c index 3ab58f0584a8..2742a0895aab 100644 --- a/drivers/pci/controller/dwc/pcie-al.c +++ b/drivers/pci/controller/dwc/pcie-al.c @@ -91,3 +91,400 @@ 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 + +/* The AXI regs are always at the beginning of the PCIE controller reg space. */ +#define AXI_BASE_OFFSET 0x0 + +#define DEVICE_ID_OFFSET 0x16c + +#define DEVICE_REV_ID 0x0 +#define DEVICE_REV_ID_DEV_ID_MASK 0xFFFF0000 +#define DEVICE_REV_ID_DEV_ID_SHIFT 16 + +#define DEVICE_REV_ID_DEV_ID_X4 (0 << DEVICE_REV_ID_DEV_ID_SHIFT) +#define DEVICE_REV_ID_DEV_ID_X8 (2 << DEVICE_REV_ID_DEV_ID_SHIFT) +#define DEVICE_REV_ID_DEV_ID_X16 (4 << DEVICE_REV_ID_DEV_ID_SHIFT) + +/* The ob_ctrl offset inside the axi regs is different between revisions. + */ +#define OB_CTRL_REV1_2_OFFSET 0x0040 +#define OB_CTRL_REV3_5_OFFSET 0x0030 + +#define CFG_TARGET_BUS 0x0 +#define CFG_TARGET_BUS_MASK_SHIFT 0 +#define CFG_TARGET_BUS_BUSNUM_SHIFT 8 + +#define CFG_CONTROL 0x4 +#define CFG_CONTROL_SUBBUS_MASK 0x0000FF00 +#define CFG_CONTROL_SUBBUS_SHIFT 8 +#define CFG_CONTROL_SEC_BUS_MASK 0x00FF0000 +#define CFG_CONTROL_SEC_BUS_SHIFT 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) */ + void __iomem *dbi_base; + resource_size_t ecam_size; + struct device *dev; + 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 = readl(dev_rev_id_addr) & DEVICE_REV_ID_DEV_ID_MASK; + + 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%08x)\n", + dev_rev_id); + return -EINVAL; + } + + dev_dbg(pcie->dev, "dev_rev_id: 0x%08x\n", dev_rev_id); + + 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); + 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 = (target_bus << CFG_TARGET_BUS_BUSNUM_SHIFT) | + 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); +} + +static void __iomem *al_pcie_conf_addr_map(struct al_pcie *pcie, + unsigned int busnr, + unsigned int devfn) +{ + void __iomem *pci_base_addr; + 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 %d to %d\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 %#x (pci_addr: 0x%p) - 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_dbg(pci->dev, "%d-byte config write to %04x:%02x:%02x.%d offset %#x (pci_addr: 0x%p) - 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 = 0; + + 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) | + (secondary_bus << CFG_CONTROL_SEC_BUS_SHIFT); + reg = (reg & ~CFG_CONTROL_SUBBUS_MASK) | + (subordinate_bus << CFG_CONTROL_SUBBUS_SHIFT); + + 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 = 0; + u32 reg = 0; + int rc; + + reg = dw_pcie_readb_dbi(pci, PCI_HEADER_TYPE); + if (reg != PCI_HEADER_TYPE_BRIDGE) { + dev_err(pci->dev, "PCIe controller is not set to bridge type (%d)!\n", + reg); + return -EIO; + } + + link_up = dw_pcie_link_up(pci); + if (!link_up) { + dev_err(pci->dev, "link in not up!\n"); + return -ENOLINK; + } + + dev_info(pci->dev, "link is up\n"); + + 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; + + 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 %p\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 %p\n", + controller_res); + return PTR_ERR(al_pcie->controller_base); + } + + dev_dbg(dev, "From DT: dbi_base: 0x%llx, controller_base: 0x%llx\n", + dbi_res->start, controller_res->start); + + platform_set_drvdata(pdev, al_pcie); + + ret = al_add_pcie_port(&pci->pp, pdev); + if (ret) + return ret; + + return 0; +} + +static const struct of_device_id al_pcie_of_match[] = { + { .compatible = "amazon,al-pcie", + .data = NULL, + }, + {}, +}; + +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*/
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@amazon.com> --- drivers/pci/controller/dwc/Kconfig | 11 + drivers/pci/controller/dwc/pcie-al.c | 397 +++++++++++++++++++++++++++ 2 files changed, 408 insertions(+)