| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Valentine Barshak | 854 | 48.55% | 2 | 8.00% |
| Ben Dooks | 359 | 20.41% | 4 | 16.00% |
| Phil Edworthy | 231 | 13.13% | 1 | 4.00% |
| Magnus Damm | 164 | 9.32% | 2 | 8.00% |
| Björn Helgaas | 75 | 4.26% | 4 | 16.00% |
| Lucas Stach | 27 | 1.53% | 1 | 4.00% |
| Nobuhiro Iwamatsu | 12 | 0.68% | 1 | 4.00% |
| Simon Horman | 10 | 0.57% | 2 | 8.00% |
| Rob Herring | 10 | 0.57% | 2 | 8.00% |
| Wei Yongjun | 7 | 0.40% | 1 | 4.00% |
| Sergei Shtylyov | 6 | 0.34% | 1 | 4.00% |
| Marc Gonzalez | 1 | 0.06% | 1 | 4.00% |
| Colin Ian King | 1 | 0.06% | 1 | 4.00% |
| Arvind Yadav | 1 | 0.06% | 1 | 4.00% |
| Paul Gortmaker | 1 | 0.06% | 1 | 4.00% |
| Total | 1759 | 25 |
// SPDX-License-Identifier: GPL-2.0 /* * pci-rcar-gen2: internal PCI bus support * * Copyright (C) 2013 Renesas Solutions Corp. * Copyright (C) 2013 Cogent Embedded, Inc. * * Author: Valentine Barshak <valentine.barshak@cogentembedded.com> */ #include <linux/delay.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/of_address.h> #include <linux/of_pci.h> #include <linux/pci.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/sizes.h> #include <linux/slab.h> #include "../pci.h" /* AHB-PCI Bridge PCI communication registers */ #define RCAR_AHBPCI_PCICOM_OFFSET 0x800 #define RCAR_PCIAHB_WIN1_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x00) #define RCAR_PCIAHB_WIN2_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x04) #define RCAR_PCIAHB_PREFETCH0 0x0 #define RCAR_PCIAHB_PREFETCH4 0x1 #define RCAR_PCIAHB_PREFETCH8 0x2 #define RCAR_PCIAHB_PREFETCH16 0x3 #define RCAR_AHBPCI_WIN1_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x10) #define RCAR_AHBPCI_WIN2_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x14) #define RCAR_AHBPCI_WIN_CTR_MEM (3 << 1) #define RCAR_AHBPCI_WIN_CTR_CFG (5 << 1) #define RCAR_AHBPCI_WIN1_HOST (1 << 30) #define RCAR_AHBPCI_WIN1_DEVICE (1 << 31) #define RCAR_PCI_INT_ENABLE_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x20) #define RCAR_PCI_INT_STATUS_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x24) #define RCAR_PCI_INT_SIGTABORT (1 << 0) #define RCAR_PCI_INT_SIGRETABORT (1 << 1) #define RCAR_PCI_INT_REMABORT (1 << 2) #define RCAR_PCI_INT_PERR (1 << 3) #define RCAR_PCI_INT_SIGSERR (1 << 4) #define RCAR_PCI_INT_RESERR (1 << 5) #define RCAR_PCI_INT_WIN1ERR (1 << 12) #define RCAR_PCI_INT_WIN2ERR (1 << 13) #define RCAR_PCI_INT_A (1 << 16) #define RCAR_PCI_INT_B (1 << 17) #define RCAR_PCI_INT_PME (1 << 19) #define RCAR_PCI_INT_ALLERRORS (RCAR_PCI_INT_SIGTABORT | \ RCAR_PCI_INT_SIGRETABORT | \ RCAR_PCI_INT_REMABORT | \ RCAR_PCI_INT_PERR | \ RCAR_PCI_INT_SIGSERR | \ RCAR_PCI_INT_RESERR | \ RCAR_PCI_INT_WIN1ERR | \ RCAR_PCI_INT_WIN2ERR) #define RCAR_AHB_BUS_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x30) #define RCAR_AHB_BUS_MMODE_HTRANS (1 << 0) #define RCAR_AHB_BUS_MMODE_BYTE_BURST (1 << 1) #define RCAR_AHB_BUS_MMODE_WR_INCR (1 << 2) #define RCAR_AHB_BUS_MMODE_HBUS_REQ (1 << 7) #define RCAR_AHB_BUS_SMODE_READYCTR (1 << 17) #define RCAR_AHB_BUS_MODE (RCAR_AHB_BUS_MMODE_HTRANS | \ RCAR_AHB_BUS_MMODE_BYTE_BURST | \ RCAR_AHB_BUS_MMODE_WR_INCR | \ RCAR_AHB_BUS_MMODE_HBUS_REQ | \ RCAR_AHB_BUS_SMODE_READYCTR) #define RCAR_USBCTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x34) #define RCAR_USBCTR_USBH_RST (1 << 0) #define RCAR_USBCTR_PCICLK_MASK (1 << 1) #define RCAR_USBCTR_PLL_RST (1 << 2) #define RCAR_USBCTR_DIRPD (1 << 8) #define RCAR_USBCTR_PCIAHB_WIN2_EN (1 << 9) #define RCAR_USBCTR_PCIAHB_WIN1_256M (0 << 10) #define RCAR_USBCTR_PCIAHB_WIN1_512M (1 << 10) #define RCAR_USBCTR_PCIAHB_WIN1_1G (2 << 10) #define RCAR_USBCTR_PCIAHB_WIN1_2G (3 << 10) #define RCAR_USBCTR_PCIAHB_WIN1_MASK (3 << 10) #define RCAR_PCI_ARBITER_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x40) #define RCAR_PCI_ARBITER_PCIREQ0 (1 << 0) #define RCAR_PCI_ARBITER_PCIREQ1 (1 << 1) #define RCAR_PCI_ARBITER_PCIBP_MODE (1 << 12) #define RCAR_PCI_UNIT_REV_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x48) struct rcar_pci_priv { struct device *dev; void __iomem *reg; struct resource mem_res; struct resource *cfg_res; unsigned busnr; int irq; unsigned long window_size; unsigned long window_addr; unsigned long window_pci; }; /* PCI configuration space operations */ static void __iomem *rcar_pci_cfg_base(struct pci_bus *bus, unsigned int devfn, int where) { struct pci_sys_data *sys = bus->sysdata; struct rcar_pci_priv *priv = sys->private_data; int slot, val; if (sys->busnr != bus->number || PCI_FUNC(devfn)) return NULL; /* Only one EHCI/OHCI device built-in */ slot = PCI_SLOT(devfn); if (slot > 2) return NULL; /* bridge logic only has registers to 0x40 */ if (slot == 0x0 && where >= 0x40) return NULL; val = slot ? RCAR_AHBPCI_WIN1_DEVICE | RCAR_AHBPCI_WIN_CTR_CFG : RCAR_AHBPCI_WIN1_HOST | RCAR_AHBPCI_WIN_CTR_CFG; iowrite32(val, priv->reg + RCAR_AHBPCI_WIN1_CTR_REG); return priv->reg + (slot >> 1) * 0x100 + where; } /* PCI interrupt mapping */ static int rcar_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) { struct pci_sys_data *sys = dev->bus->sysdata; struct rcar_pci_priv *priv = sys->private_data; int irq; irq = of_irq_parse_and_map_pci(dev, slot, pin); if (!irq) irq = priv->irq; return irq; } #ifdef CONFIG_PCI_DEBUG /* if debug enabled, then attach an error handler irq to the bridge */ static irqreturn_t rcar_pci_err_irq(int irq, void *pw) { struct rcar_pci_priv *priv = pw; struct device *dev = priv->dev; u32 status = ioread32(priv->reg + RCAR_PCI_INT_STATUS_REG); if (status & RCAR_PCI_INT_ALLERRORS) { dev_err(dev, "error irq: status %08x\n", status); /* clear the error(s) */ iowrite32(status & RCAR_PCI_INT_ALLERRORS, priv->reg + RCAR_PCI_INT_STATUS_REG); return IRQ_HANDLED; } return IRQ_NONE; } static void rcar_pci_setup_errirq(struct rcar_pci_priv *priv) { struct device *dev = priv->dev; int ret; u32 val; ret = devm_request_irq(dev, priv->irq, rcar_pci_err_irq, IRQF_SHARED, "error irq", priv); if (ret) { dev_err(dev, "cannot claim IRQ for error handling\n"); return; } val = ioread32(priv->reg + RCAR_PCI_INT_ENABLE_REG); val |= RCAR_PCI_INT_ALLERRORS; iowrite32(val, priv->reg + RCAR_PCI_INT_ENABLE_REG); } #else static inline void rcar_pci_setup_errirq(struct rcar_pci_priv *priv) { } #endif /* PCI host controller setup */ static int rcar_pci_setup(int nr, struct pci_sys_data *sys) { struct rcar_pci_priv *priv = sys->private_data; struct device *dev = priv->dev; void __iomem *reg = priv->reg; u32 val; int ret; pm_runtime_enable(dev); pm_runtime_get_sync(dev); val = ioread32(reg + RCAR_PCI_UNIT_REV_REG); dev_info(dev, "PCI: bus%u revision %x\n", sys->busnr, val); /* Disable Direct Power Down State and assert reset */ val = ioread32(reg + RCAR_USBCTR_REG) & ~RCAR_USBCTR_DIRPD; val |= RCAR_USBCTR_USBH_RST | RCAR_USBCTR_PLL_RST; iowrite32(val, reg + RCAR_USBCTR_REG); udelay(4); /* De-assert reset and reset PCIAHB window1 size */ val &= ~(RCAR_USBCTR_PCIAHB_WIN1_MASK | RCAR_USBCTR_PCICLK_MASK | RCAR_USBCTR_USBH_RST | RCAR_USBCTR_PLL_RST); /* Setup PCIAHB window1 size */ switch (priv->window_size) { case SZ_2G: val |= RCAR_USBCTR_PCIAHB_WIN1_2G; break; case SZ_1G: val |= RCAR_USBCTR_PCIAHB_WIN1_1G; break; case SZ_512M: val |= RCAR_USBCTR_PCIAHB_WIN1_512M; break; default: pr_warn("unknown window size %ld - defaulting to 256M\n", priv->window_size); priv->window_size = SZ_256M; /* fall-through */ case SZ_256M: val |= RCAR_USBCTR_PCIAHB_WIN1_256M; break; } iowrite32(val, reg + RCAR_USBCTR_REG); /* Configure AHB master and slave modes */ iowrite32(RCAR_AHB_BUS_MODE, reg + RCAR_AHB_BUS_CTR_REG); /* Configure PCI arbiter */ val = ioread32(reg + RCAR_PCI_ARBITER_CTR_REG); val |= RCAR_PCI_ARBITER_PCIREQ0 | RCAR_PCI_ARBITER_PCIREQ1 | RCAR_PCI_ARBITER_PCIBP_MODE; iowrite32(val, reg + RCAR_PCI_ARBITER_CTR_REG); /* PCI-AHB mapping */ iowrite32(priv->window_addr | RCAR_PCIAHB_PREFETCH16, reg + RCAR_PCIAHB_WIN1_CTR_REG); /* AHB-PCI mapping: OHCI/EHCI registers */ val = priv->mem_res.start | RCAR_AHBPCI_WIN_CTR_MEM; iowrite32(val, reg + RCAR_AHBPCI_WIN2_CTR_REG); /* Enable AHB-PCI bridge PCI configuration access */ iowrite32(RCAR_AHBPCI_WIN1_HOST | RCAR_AHBPCI_WIN_CTR_CFG, reg + RCAR_AHBPCI_WIN1_CTR_REG); /* Set PCI-AHB Window1 address */ iowrite32(priv->window_pci | PCI_BASE_ADDRESS_MEM_PREFETCH, reg + PCI_BASE_ADDRESS_1); /* Set AHB-PCI bridge PCI communication area address */ val = priv->cfg_res->start + RCAR_AHBPCI_PCICOM_OFFSET; iowrite32(val, reg + PCI_BASE_ADDRESS_0); val = ioread32(reg + PCI_COMMAND); val |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER; iowrite32(val, reg + PCI_COMMAND); /* Enable PCI interrupts */ iowrite32(RCAR_PCI_INT_A | RCAR_PCI_INT_B | RCAR_PCI_INT_PME, reg + RCAR_PCI_INT_ENABLE_REG); if (priv->irq > 0) rcar_pci_setup_errirq(priv); /* Add PCI resources */ pci_add_resource(&sys->resources, &priv->mem_res); ret = devm_request_pci_bus_resources(dev, &sys->resources); if (ret < 0) return ret; /* Setup bus number based on platform device id / of bus-range */ sys->busnr = priv->busnr; return 1; } static struct pci_ops rcar_pci_ops = { .map_bus = rcar_pci_cfg_base, .read = pci_generic_config_read, .write = pci_generic_config_write, }; static int rcar_pci_parse_map_dma_ranges(struct rcar_pci_priv *pci, struct device_node *np) { struct device *dev = pci->dev; struct of_pci_range range; struct of_pci_range_parser parser; int index = 0; /* Failure to parse is ok as we fall back to defaults */ if (of_pci_dma_range_parser_init(&parser, np)) return 0; /* Get the dma-ranges from DT */ for_each_of_pci_range(&parser, &range) { /* Hardware only allows one inbound 32-bit range */ if (index) return -EINVAL; pci->window_addr = (unsigned long)range.cpu_addr; pci->window_pci = (unsigned long)range.pci_addr; pci->window_size = (unsigned long)range.size; /* Catch HW limitations */ if (!(range.flags & IORESOURCE_PREFETCH)) { dev_err(dev, "window must be prefetchable\n"); return -EINVAL; } if (pci->window_addr) { u32 lowaddr = 1 << (ffs(pci->window_addr) - 1); if (lowaddr < pci->window_size) { dev_err(dev, "invalid window size/addr\n"); return -EINVAL; } } index++; } return 0; } static int rcar_pci_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct resource *cfg_res, *mem_res; struct rcar_pci_priv *priv; void __iomem *reg; struct hw_pci hw; void *hw_private[1]; cfg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); reg = devm_ioremap_resource(dev, cfg_res); if (IS_ERR(reg)) return PTR_ERR(reg); mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (!mem_res || !mem_res->start) return -ENODEV; if (mem_res->start & 0xFFFF) return -EINVAL; priv = devm_kzalloc(dev, sizeof(struct rcar_pci_priv), GFP_KERNEL); if (!priv) return -ENOMEM; priv->mem_res = *mem_res; priv->cfg_res = cfg_res; priv->irq = platform_get_irq(pdev, 0); priv->reg = reg; priv->dev = dev; if (priv->irq < 0) { dev_err(dev, "no valid irq found\n"); return priv->irq; } /* default window addr and size if not specified in DT */ priv->window_addr = 0x40000000; priv->window_pci = 0x40000000; priv->window_size = SZ_1G; if (dev->of_node) { struct resource busnr; int ret; ret = of_pci_parse_bus_range(dev->of_node, &busnr); if (ret < 0) { dev_err(dev, "failed to parse bus-range\n"); return ret; } priv->busnr = busnr.start; if (busnr.end != busnr.start) dev_warn(dev, "only one bus number supported\n"); ret = rcar_pci_parse_map_dma_ranges(priv, dev->of_node); if (ret < 0) { dev_err(dev, "failed to parse dma-range\n"); return ret; } } else { priv->busnr = pdev->id; } hw_private[0] = priv; memset(&hw, 0, sizeof(hw)); hw.nr_controllers = ARRAY_SIZE(hw_private); hw.io_optional = 1; hw.private_data = hw_private; hw.map_irq = rcar_pci_map_irq; hw.ops = &rcar_pci_ops; hw.setup = rcar_pci_setup; pci_common_init_dev(dev, &hw); return 0; } static const struct of_device_id rcar_pci_of_match[] = { { .compatible = "renesas,pci-r8a7790", }, { .compatible = "renesas,pci-r8a7791", }, { .compatible = "renesas,pci-r8a7794", }, { .compatible = "renesas,pci-rcar-gen2", }, { }, }; static struct platform_driver rcar_pci_driver = { .driver = { .name = "pci-rcar-gen2", .suppress_bind_attrs = true, .of_match_table = rcar_pci_of_match, }, .probe = rcar_pci_probe, }; builtin_platform_driver(rcar_pci_driver);
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