From 608793e27b3313b2385af557c95d8e4207126670 Mon Sep 17 00:00:00 2001 From: Kishon Vijay Abraham I Date: Mon, 27 Mar 2017 15:15:08 +0530 Subject: [PATCH] PCI: dwc: dra7xx: Add EP mode support The PCIe controller integrated in dra7xx SoCs is capable of operating in endpoint mode. Add endpoint mode support to dra7xx driver. Signed-off-by: Kishon Vijay Abraham I Signed-off-by: Bjorn Helgaas --- drivers/pci/dwc/Kconfig | 31 ++++- drivers/pci/dwc/Makefile | 4 +- drivers/pci/dwc/pci-dra7xx.c | 197 ++++++++++++++++++++++++++++-- drivers/pci/dwc/pcie-designware.h | 7 ++ 4 files changed, 221 insertions(+), 18 deletions(-) diff --git a/drivers/pci/dwc/Kconfig b/drivers/pci/dwc/Kconfig index d37ea72a846a..b7e15526d676 100644 --- a/drivers/pci/dwc/Kconfig +++ b/drivers/pci/dwc/Kconfig @@ -16,14 +16,37 @@ config PCIE_DW_EP config PCI_DRA7XX bool "TI DRA7xx PCIe controller" - depends on PCI + depends on (PCI && PCI_MSI_IRQ_DOMAIN) || PCI_ENDPOINT depends on OF && HAS_IOMEM && TI_PIPE3 + help + Enables support for the PCIe controller in the DRA7xx SoC. There + are two instances of PCIe controller in DRA7xx. This controller can + work either as EP or RC. In order to enable host-specific features + PCI_DRA7XX_HOST must be selected and in order to enable device- + specific features PCI_DRA7XX_EP must be selected. This uses + the Designware core. + +if PCI_DRA7XX + +config PCI_DRA7XX_HOST + bool "PCI DRA7xx Host Mode" + depends on PCI depends on PCI_MSI_IRQ_DOMAIN select PCIE_DW_HOST + default y help - Enables support for the PCIe controller in the DRA7xx SoC. There - are two instances of PCIe controller in DRA7xx. This controller can - act both as EP and RC. This reuses the Designware core. + Enables support for the PCIe controller in the DRA7xx SoC to work in + host mode. + +config PCI_DRA7XX_EP + bool "PCI DRA7xx Endpoint Mode" + depends on PCI_ENDPOINT + select PCIE_DW_EP + help + Enables support for the PCIe controller in the DRA7xx SoC to work in + endpoint mode. + +endif config PCIE_DW_PLAT bool "Platform bus based DesignWare PCIe Controller" diff --git a/drivers/pci/dwc/Makefile b/drivers/pci/dwc/Makefile index b38425d36200..f31a8596442a 100644 --- a/drivers/pci/dwc/Makefile +++ b/drivers/pci/dwc/Makefile @@ -2,7 +2,9 @@ obj-$(CONFIG_PCIE_DW) += pcie-designware.o obj-$(CONFIG_PCIE_DW_HOST) += pcie-designware-host.o obj-$(CONFIG_PCIE_DW_EP) += pcie-designware-ep.o obj-$(CONFIG_PCIE_DW_PLAT) += pcie-designware-plat.o -obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o +ifneq ($(filter y,$(CONFIG_PCI_DRA7XX_HOST) $(CONFIG_PCI_DRA7XX_EP)),) + obj-$(CONFIG_PCI_DRA7XX) += pci-dra7xx.o +endif obj-$(CONFIG_PCI_EXYNOS) += pci-exynos.o obj-$(CONFIG_PCI_IMX6) += pci-imx6.o obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c index d78974d20360..35c18534469c 100644 --- a/drivers/pci/dwc/pci-dra7xx.c +++ b/drivers/pci/dwc/pci-dra7xx.c @@ -10,12 +10,14 @@ * published by the Free Software Foundation. */ +#include #include #include #include #include #include #include +#include #include #include #include @@ -57,6 +59,11 @@ #define MSI BIT(4) #define LEG_EP_INTERRUPTS (INTA | INTB | INTC | INTD) +#define PCIECTRL_TI_CONF_DEVICE_TYPE 0x0100 +#define DEVICE_TYPE_EP 0x0 +#define DEVICE_TYPE_LEG_EP 0x1 +#define DEVICE_TYPE_RC 0x4 + #define PCIECTRL_DRA7XX_CONF_DEVICE_CMD 0x0104 #define LTSSM_EN 0x1 @@ -66,6 +73,13 @@ #define EXP_CAP_ID_OFFSET 0x70 +#define PCIECTRL_TI_CONF_INTX_ASSERT 0x0124 +#define PCIECTRL_TI_CONF_INTX_DEASSERT 0x0128 + +#define PCIECTRL_TI_CONF_MSI_XMT 0x012c +#define MSI_REQ_GRANT BIT(0) +#define MSI_VECTOR_SHIFT 7 + struct dra7xx_pcie { struct dw_pcie *pci; void __iomem *base; /* DT ti_conf */ @@ -73,6 +87,11 @@ struct dra7xx_pcie { struct phy **phy; int link_gen; struct irq_domain *irq_domain; + enum dw_pcie_device_mode mode; +}; + +struct dra7xx_pcie_of_data { + enum dw_pcie_device_mode mode; }; #define to_dra7xx_pcie(x) dev_get_drvdata((x)->dev) @@ -101,9 +120,19 @@ static int dra7xx_pcie_link_up(struct dw_pcie *pci) return !!(reg & LINK_UP); } -static int dra7xx_pcie_establish_link(struct dra7xx_pcie *dra7xx) +static void dra7xx_pcie_stop_link(struct dw_pcie *pci) { - struct dw_pcie *pci = dra7xx->pci; + struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci); + u32 reg; + + reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD); + reg &= ~LTSSM_EN; + dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg); +} + +static int dra7xx_pcie_establish_link(struct dw_pcie *pci) +{ + struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci); struct device *dev = pci->dev; u32 reg; u32 exp_cap_off = EXP_CAP_ID_OFFSET; @@ -137,7 +166,7 @@ static int dra7xx_pcie_establish_link(struct dra7xx_pcie *dra7xx) reg |= LTSSM_EN; dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg); - return dw_pcie_wait_for_link(pci); + return 0; } static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx) @@ -171,7 +200,8 @@ static void dra7xx_pcie_host_init(struct pcie_port *pp) dw_pcie_setup_rc(pp); - dra7xx_pcie_establish_link(dra7xx); + dra7xx_pcie_establish_link(pci); + dw_pcie_wait_for_link(pci); dw_pcie_msi_init(pp); dra7xx_pcie_enable_interrupts(dra7xx); } @@ -249,6 +279,7 @@ static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg) struct dra7xx_pcie *dra7xx = arg; struct dw_pcie *pci = dra7xx->pci; struct device *dev = pci->dev; + struct dw_pcie_ep *ep = &pci->ep; u32 reg; reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN); @@ -285,8 +316,11 @@ static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg) if (reg & LINK_REQ_RST) dev_dbg(dev, "Link Request Reset\n"); - if (reg & LINK_UP_EVT) + if (reg & LINK_UP_EVT) { + if (dra7xx->mode == DW_PCIE_EP_TYPE) + dw_pcie_ep_linkup(ep); dev_dbg(dev, "Link-up state change\n"); + } if (reg & CFG_BME_EVT) dev_dbg(dev, "CFG 'Bus Master Enable' change\n"); @@ -299,6 +333,94 @@ static irqreturn_t dra7xx_pcie_irq_handler(int irq, void *arg) return IRQ_HANDLED; } +static void dra7xx_pcie_ep_init(struct dw_pcie_ep *ep) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci); + + dra7xx_pcie_enable_wrapper_interrupts(dra7xx); +} + +static void dra7xx_pcie_raise_legacy_irq(struct dra7xx_pcie *dra7xx) +{ + dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_INTX_ASSERT, 0x1); + mdelay(1); + dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_INTX_DEASSERT, 0x1); +} + +static void dra7xx_pcie_raise_msi_irq(struct dra7xx_pcie *dra7xx, + u8 interrupt_num) +{ + u32 reg; + + reg = (interrupt_num - 1) << MSI_VECTOR_SHIFT; + reg |= MSI_REQ_GRANT; + dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_MSI_XMT, reg); +} + +static int dra7xx_pcie_raise_irq(struct dw_pcie_ep *ep, + enum pci_epc_irq_type type, u8 interrupt_num) +{ + struct dw_pcie *pci = to_dw_pcie_from_ep(ep); + struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pci); + + switch (type) { + case PCI_EPC_IRQ_LEGACY: + dra7xx_pcie_raise_legacy_irq(dra7xx); + break; + case PCI_EPC_IRQ_MSI: + dra7xx_pcie_raise_msi_irq(dra7xx, interrupt_num); + break; + default: + dev_err(pci->dev, "UNKNOWN IRQ type\n"); + } + + return 0; +} + +static struct dw_pcie_ep_ops pcie_ep_ops = { + .ep_init = dra7xx_pcie_ep_init, + .raise_irq = dra7xx_pcie_raise_irq, +}; + +static int __init dra7xx_add_pcie_ep(struct dra7xx_pcie *dra7xx, + struct platform_device *pdev) +{ + int ret; + struct dw_pcie_ep *ep; + struct resource *res; + struct device *dev = &pdev->dev; + struct dw_pcie *pci = dra7xx->pci; + + ep = &pci->ep; + ep->ops = &pcie_ep_ops; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ep_dbics"); + pci->dbi_base = devm_ioremap(dev, res->start, resource_size(res)); + if (!pci->dbi_base) + return -ENOMEM; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ep_dbics2"); + pci->dbi_base2 = devm_ioremap(dev, res->start, resource_size(res)); + if (!pci->dbi_base2) + return -ENOMEM; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "addr_space"); + if (!res) + return -EINVAL; + + ep->phys_base = res->start; + ep->addr_size = resource_size(res); + + ret = dw_pcie_ep_init(ep); + if (ret) { + dev_err(dev, "failed to initialize endpoint\n"); + return ret; + } + + return 0; +} + static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx, struct platform_device *pdev) { @@ -342,6 +464,8 @@ static int __init dra7xx_add_pcie_port(struct dra7xx_pcie *dra7xx, static const struct dw_pcie_ops dw_pcie_ops = { .cpu_addr_fixup = dra7xx_pcie_cpu_addr_fixup, + .start_link = dra7xx_pcie_establish_link, + .stop_link = dra7xx_pcie_stop_link, .link_up = dra7xx_pcie_link_up, }; @@ -384,6 +508,26 @@ static int dra7xx_pcie_enable_phy(struct dra7xx_pcie *dra7xx) return ret; } +static const struct dra7xx_pcie_of_data dra7xx_pcie_rc_of_data = { + .mode = DW_PCIE_RC_TYPE, +}; + +static const struct dra7xx_pcie_of_data dra7xx_pcie_ep_of_data = { + .mode = DW_PCIE_EP_TYPE, +}; + +static const struct of_device_id of_dra7xx_pcie_match[] = { + { + .compatible = "ti,dra7-pcie", + .data = &dra7xx_pcie_rc_of_data, + }, + { + .compatible = "ti,dra7-pcie-ep", + .data = &dra7xx_pcie_ep_of_data, + }, + {}, +}; + static int __init dra7xx_pcie_probe(struct platform_device *pdev) { u32 reg; @@ -401,6 +545,16 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev) struct device_node *np = dev->of_node; char name[10]; struct gpio_desc *reset; + const struct of_device_id *match; + const struct dra7xx_pcie_of_data *data; + enum dw_pcie_device_mode mode; + + match = of_match_device(of_match_ptr(of_dra7xx_pcie_match), dev); + if (!match) + return -EINVAL; + + data = (struct dra7xx_pcie_of_data *)match->data; + mode = (enum dw_pcie_device_mode)data->mode; dra7xx = devm_kzalloc(dev, sizeof(*dra7xx), GFP_KERNEL); if (!dra7xx) @@ -479,9 +633,25 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev) if (dra7xx->link_gen < 0 || dra7xx->link_gen > 2) dra7xx->link_gen = 2; - ret = dra7xx_add_pcie_port(dra7xx, pdev); - if (ret < 0) - goto err_gpio; + switch (mode) { + case DW_PCIE_RC_TYPE: + dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE, + DEVICE_TYPE_RC); + ret = dra7xx_add_pcie_port(dra7xx, pdev); + if (ret < 0) + goto err_gpio; + break; + case DW_PCIE_EP_TYPE: + dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE, + DEVICE_TYPE_EP); + ret = dra7xx_add_pcie_ep(dra7xx, pdev); + if (ret < 0) + goto err_gpio; + break; + default: + dev_err(dev, "INVALID device type %d\n", mode); + } + dra7xx->mode = mode; ret = devm_request_irq(dev, irq, dra7xx_pcie_irq_handler, IRQF_SHARED, "dra7xx-pcie-main", dra7xx); @@ -509,6 +679,9 @@ static int dra7xx_pcie_suspend(struct device *dev) struct dw_pcie *pci = dra7xx->pci; u32 val; + if (dra7xx->mode != DW_PCIE_RC_TYPE) + return 0; + /* clear MSE */ val = dw_pcie_readl_dbi(pci, PCI_COMMAND); val &= ~PCI_COMMAND_MEMORY; @@ -523,6 +696,9 @@ static int dra7xx_pcie_resume(struct device *dev) struct dw_pcie *pci = dra7xx->pci; u32 val; + if (dra7xx->mode != DW_PCIE_RC_TYPE) + return 0; + /* set MSE */ val = dw_pcie_readl_dbi(pci, PCI_COMMAND); val |= PCI_COMMAND_MEMORY; @@ -561,11 +737,6 @@ static const struct dev_pm_ops dra7xx_pcie_pm_ops = { dra7xx_pcie_resume_noirq) }; -static const struct of_device_id of_dra7xx_pcie_match[] = { - { .compatible = "ti,dra7-pcie", }, - {}, -}; - static struct platform_driver dra7xx_pcie_driver = { .driver = { .name = "dra7-pcie", diff --git a/drivers/pci/dwc/pcie-designware.h b/drivers/pci/dwc/pcie-designware.h index 3cafba40abbc..c6a840575796 100644 --- a/drivers/pci/dwc/pcie-designware.h +++ b/drivers/pci/dwc/pcie-designware.h @@ -120,6 +120,13 @@ enum dw_pcie_region_type { DW_PCIE_REGION_OUTBOUND, }; +enum dw_pcie_device_mode { + DW_PCIE_UNKNOWN_TYPE, + DW_PCIE_EP_TYPE, + DW_PCIE_LEG_EP_TYPE, + DW_PCIE_RC_TYPE, +}; + struct dw_pcie_host_ops { int (*rd_own_conf)(struct pcie_port *pp, int where, int size, u32 *val); int (*wr_own_conf)(struct pcie_port *pp, int where, int size, u32 val);