Re: [PATCH 6/8] PCI: al: Add support for DW based driver type

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxxxxxx>
> > ---
> >  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
> > 





[Index of Archives]     [Device Tree Compilter]     [Device Tree Spec]     [Linux Driver Backports]     [Video for Linux]     [Linux USB Devel]     [Linux PCI Devel]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Yosemite Backpacking]


  Powered by Linux