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PCI: layerscape: Add the endpoint linkup notifier support

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Layerscape has PME interrupt, which can be used as linkup notifier.  Set
CFG_READY bit of PEX_PF0_CONFIG to enable accesses from root complex when
linkup detected.

Link: https://lore.kernel.org/r/20230515151049.2797105-1-Frank.Li@nxp.com
Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
This commit is contained in:
Frank Li 2023-05-15 11:10:49 -04:00 committed by Bjorn Helgaas
parent 4ab91207fe
commit 061cbfab09
1 changed files with 99 additions and 1 deletions
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100
drivers/pci/controller/dwc/pci-layerscape-ep.c
View file

@ -18,6 +18,20 @@
#include "pcie-designware.h"
#define PEX_PF0_CONFIG 0xC0014
#define PEX_PF0_CFG_READY BIT(0)
/* PEX PFa PCIE PME and message interrupt registers*/
#define PEX_PF0_PME_MES_DR 0xC0020
#define PEX_PF0_PME_MES_DR_LUD BIT(7)
#define PEX_PF0_PME_MES_DR_LDD BIT(9)
#define PEX_PF0_PME_MES_DR_HRD BIT(10)
#define PEX_PF0_PME_MES_IER 0xC0028
#define PEX_PF0_PME_MES_IER_LUDIE BIT(7)
#define PEX_PF0_PME_MES_IER_LDDIE BIT(9)
#define PEX_PF0_PME_MES_IER_HRDIE BIT(10)
#define to_ls_pcie_ep(x) dev_get_drvdata((x)->dev)
struct ls_pcie_ep_drvdata {
@ -30,8 +44,84 @@ struct ls_pcie_ep {
struct dw_pcie *pci;
struct pci_epc_features *ls_epc;
const struct ls_pcie_ep_drvdata *drvdata;
int irq;
bool big_endian;
};
static u32 ls_lut_readl(struct ls_pcie_ep *pcie, u32 offset)
{
struct dw_pcie *pci = pcie->pci;
if (pcie->big_endian)
return ioread32be(pci->dbi_base + offset);
else
return ioread32(pci->dbi_base + offset);
}
static void ls_lut_writel(struct ls_pcie_ep *pcie, u32 offset, u32 value)
{
struct dw_pcie *pci = pcie->pci;
if (pcie->big_endian)
iowrite32be(value, pci->dbi_base + offset);
else
iowrite32(value, pci->dbi_base + offset);
}
static irqreturn_t ls_pcie_ep_event_handler(int irq, void *dev_id)
{
struct ls_pcie_ep *pcie = dev_id;
struct dw_pcie *pci = pcie->pci;
u32 val, cfg;
val = ls_lut_readl(pcie, PEX_PF0_PME_MES_DR);
ls_lut_writel(pcie, PEX_PF0_PME_MES_DR, val);
if (!val)
return IRQ_NONE;
if (val & PEX_PF0_PME_MES_DR_LUD) {
cfg = ls_lut_readl(pcie, PEX_PF0_CONFIG);
cfg |= PEX_PF0_CFG_READY;
ls_lut_writel(pcie, PEX_PF0_CONFIG, cfg);
dw_pcie_ep_linkup(&pci->ep);
dev_dbg(pci->dev, "Link up\n");
} else if (val & PEX_PF0_PME_MES_DR_LDD) {
dev_dbg(pci->dev, "Link down\n");
} else if (val & PEX_PF0_PME_MES_DR_HRD) {
dev_dbg(pci->dev, "Hot reset\n");
}
return IRQ_HANDLED;
}
static int ls_pcie_ep_interrupt_init(struct ls_pcie_ep *pcie,
struct platform_device *pdev)
{
u32 val;
int ret;
pcie->irq = platform_get_irq_byname(pdev, "pme");
if (pcie->irq < 0)
return pcie->irq;
ret = devm_request_irq(&pdev->dev, pcie->irq, ls_pcie_ep_event_handler,
IRQF_SHARED, pdev->name, pcie);
if (ret) {
dev_err(&pdev->dev, "Can't register PCIe IRQ\n");
return ret;
}
/* Enable interrupts */
val = ls_lut_readl(pcie, PEX_PF0_PME_MES_IER);
val |= PEX_PF0_PME_MES_IER_LDDIE | PEX_PF0_PME_MES_IER_HRDIE |
PEX_PF0_PME_MES_IER_LUDIE;
ls_lut_writel(pcie, PEX_PF0_PME_MES_IER, val);
return 0;
}
static const struct pci_epc_features*
ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
{
@ -125,6 +215,7 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
struct ls_pcie_ep *pcie;
struct pci_epc_features *ls_epc;
struct resource *dbi_base;
int ret;
pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
if (!pcie)
@ -144,6 +235,7 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
pci->ops = pcie->drvdata->dw_pcie_ops;
ls_epc->bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4);
ls_epc->linkup_notifier = true;
pcie->pci = pci;
pcie->ls_epc = ls_epc;
@ -155,9 +247,15 @@ static int __init ls_pcie_ep_probe(struct platform_device *pdev)
pci->ep.ops = &ls_pcie_ep_ops;
pcie->big_endian = of_property_read_bool(dev->of_node, "big-endian");
platform_set_drvdata(pdev, pcie);
return dw_pcie_ep_init(&pci->ep);
ret = dw_pcie_ep_init(&pci->ep);
if (ret)
return ret;
return ls_pcie_ep_interrupt_init(pcie, pdev);
}
static struct platform_driver ls_pcie_ep_driver = {