| Message ID | 20250410104426.463453-5-s-vadapalli@ti.com (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Krzysztof Wilczyński |
| Headers | show |
| Series | Loadable Module support for PCIe Cadence and J721E | expand |
On Thu, Apr 10, 2025 at 04:14:26PM +0530, Siddharth Vadapalli wrote: > The 'pci-j721e.c' driver is the application/glue/wrapper driver for the > Cadence PCIe Controllers on TI SoCs. Implement support for building it as a > loadable module. > > Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com> > --- > > v2 of this patch is at: > https://lore.kernel.org/r/20250330083914.529222-5-s-vadapalli@ti.com/ > Change since v2: > - Dropped a delay before PERST assertion in the driver's remove callback > based on Mani's feedback at: > https://lore.kernel.org/r/zsxnx7biwogov5dw5yiafkgk6tsrtspac75bjbrca5uevweaim@ly67hwfyk7qh/ > > drivers/pci/controller/cadence/Kconfig | 6 ++--- > drivers/pci/controller/cadence/pci-j721e.c | 31 +++++++++++++++++++++- > 2 files changed, 33 insertions(+), 4 deletions(-) > [...] > diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c > index ef1cfdae33bb..51b09f70000c 100644 > --- a/drivers/pci/controller/cadence/pci-j721e.c > +++ b/drivers/pci/controller/cadence/pci-j721e.c > @@ -15,6 +15,7 @@ > #include <linux/irqchip/chained_irq.h> > #include <linux/irqdomain.h> > #include <linux/mfd/syscon.h> > +#include <linux/module.h> > #include <linux/of.h> > #include <linux/pci.h> > #include <linux/platform_device.h> > @@ -27,6 +28,7 @@ > #define cdns_pcie_to_rc(p) container_of(p, struct cdns_pcie_rc, pcie) > > #define ENABLE_REG_SYS_2 0x108 > +#define ENABLE_CLR_REG_SYS_2 0x308 > #define STATUS_REG_SYS_2 0x508 > #define STATUS_CLR_REG_SYS_2 0x708 > #define LINK_DOWN BIT(1) > @@ -116,6 +118,15 @@ static irqreturn_t j721e_pcie_link_irq_handler(int irq, void *priv) > return IRQ_HANDLED; > } > > +static void j721e_pcie_disable_link_irq(struct j721e_pcie *pcie) > +{ > + u32 reg; > + > + reg = j721e_pcie_intd_readl(pcie, ENABLE_CLR_REG_SYS_2); > + reg |= pcie->linkdown_irq_regfield; > + j721e_pcie_intd_writel(pcie, ENABLE_CLR_REG_SYS_2, reg); > +} > + > static void j721e_pcie_config_link_irq(struct j721e_pcie *pcie) > { > u32 reg; > @@ -633,9 +644,23 @@ static void j721e_pcie_remove(struct platform_device *pdev) > struct j721e_pcie *pcie = platform_get_drvdata(pdev); > struct cdns_pcie *cdns_pcie = pcie->cdns_pcie; > struct device *dev = &pdev->dev; > + struct cdns_pcie_ep *ep; > + struct cdns_pcie_rc *rc; > + > + if (pcie->mode == PCI_MODE_RC) { > + rc = container_of(cdns_pcie, struct cdns_pcie_rc, pcie); > + cdns_pcie_host_disable(rc); > + } else { > + ep = container_of(cdns_pcie, struct cdns_pcie_ep, pcie); > + cdns_pcie_ep_disable(ep); > + } > + > + if (pcie->reset_gpio) > + gpiod_set_value_cansleep(pcie->reset_gpio, 1); As Mani pointed out in the v2 series at: https://lore.kernel.org/r/6bi5gul3sqvycmkf6cwokkvownjffaf2tkonjlefo2d7cautwx@uhfexzgz3okp/ for PERST# assert in the .remove callback, it should have been a 0 instead of a 1. I will fix this in the v4 series. Regards, Siddharth.
diff --git a/drivers/pci/controller/cadence/Kconfig b/drivers/pci/controller/cadence/Kconfig index 82b58096eea0..72d7d264d6c3 100644 --- a/drivers/pci/controller/cadence/Kconfig +++ b/drivers/pci/controller/cadence/Kconfig @@ -43,10 +43,10 @@ config PCIE_CADENCE_PLAT_EP different vendors SoCs. config PCI_J721E - bool + tristate config PCI_J721E_HOST - bool "TI J721E PCIe controller (host mode)" + tristate "TI J721E PCIe controller (host mode)" depends on ARCH_K3 || COMPILE_TEST depends on OF select PCIE_CADENCE_HOST @@ -57,7 +57,7 @@ config PCI_J721E_HOST core. config PCI_J721E_EP - bool "TI J721E PCIe controller (endpoint mode)" + tristate "TI J721E PCIe controller (endpoint mode)" depends on ARCH_K3 || COMPILE_TEST depends on OF depends on PCI_ENDPOINT diff --git a/drivers/pci/controller/cadence/pci-j721e.c b/drivers/pci/controller/cadence/pci-j721e.c index ef1cfdae33bb..51b09f70000c 100644 --- a/drivers/pci/controller/cadence/pci-j721e.c +++ b/drivers/pci/controller/cadence/pci-j721e.c @@ -15,6 +15,7 @@ #include <linux/irqchip/chained_irq.h> #include <linux/irqdomain.h> #include <linux/mfd/syscon.h> +#include <linux/module.h> #include <linux/of.h> #include <linux/pci.h> #include <linux/platform_device.h> @@ -27,6 +28,7 @@ #define cdns_pcie_to_rc(p) container_of(p, struct cdns_pcie_rc, pcie) #define ENABLE_REG_SYS_2 0x108 +#define ENABLE_CLR_REG_SYS_2 0x308 #define STATUS_REG_SYS_2 0x508 #define STATUS_CLR_REG_SYS_2 0x708 #define LINK_DOWN BIT(1) @@ -116,6 +118,15 @@ static irqreturn_t j721e_pcie_link_irq_handler(int irq, void *priv) return IRQ_HANDLED; } +static void j721e_pcie_disable_link_irq(struct j721e_pcie *pcie) +{ + u32 reg; + + reg = j721e_pcie_intd_readl(pcie, ENABLE_CLR_REG_SYS_2); + reg |= pcie->linkdown_irq_regfield; + j721e_pcie_intd_writel(pcie, ENABLE_CLR_REG_SYS_2, reg); +} + static void j721e_pcie_config_link_irq(struct j721e_pcie *pcie) { u32 reg; @@ -633,9 +644,23 @@ static void j721e_pcie_remove(struct platform_device *pdev) struct j721e_pcie *pcie = platform_get_drvdata(pdev); struct cdns_pcie *cdns_pcie = pcie->cdns_pcie; struct device *dev = &pdev->dev; + struct cdns_pcie_ep *ep; + struct cdns_pcie_rc *rc; + + if (pcie->mode == PCI_MODE_RC) { + rc = container_of(cdns_pcie, struct cdns_pcie_rc, pcie); + cdns_pcie_host_disable(rc); + } else { + ep = container_of(cdns_pcie, struct cdns_pcie_ep, pcie); + cdns_pcie_ep_disable(ep); + } + + if (pcie->reset_gpio) + gpiod_set_value_cansleep(pcie->reset_gpio, 1); clk_disable_unprepare(pcie->refclk); cdns_pcie_disable_phy(cdns_pcie); + j721e_pcie_disable_link_irq(pcie); pm_runtime_put(dev); pm_runtime_disable(dev); } @@ -730,4 +755,8 @@ static struct platform_driver j721e_pcie_driver = { .pm = pm_sleep_ptr(&j721e_pcie_pm_ops), }, }; -builtin_platform_driver(j721e_pcie_driver); +module_platform_driver(j721e_pcie_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("PCIe controller driver for TI's J721E and related SoCs"); +MODULE_AUTHOR("Kishon Vijay Abraham I <kishon@ti.com>");
The 'pci-j721e.c' driver is the application/glue/wrapper driver for the Cadence PCIe Controllers on TI SoCs. Implement support for building it as a loadable module. Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com> --- v2 of this patch is at: https://lore.kernel.org/r/20250330083914.529222-5-s-vadapalli@ti.com/ Change since v2: - Dropped a delay before PERST assertion in the driver's remove callback based on Mani's feedback at: https://lore.kernel.org/r/zsxnx7biwogov5dw5yiafkgk6tsrtspac75bjbrca5uevweaim@ly67hwfyk7qh/ drivers/pci/controller/cadence/Kconfig | 6 ++--- drivers/pci/controller/cadence/pci-j721e.c | 31 +++++++++++++++++++++- 2 files changed, 33 insertions(+), 4 deletions(-)