344 lines
9.7 KiB
C
344 lines
9.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* pci-rcar-gen2: internal PCI bus support
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*
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* Copyright (C) 2013 Renesas Solutions Corp.
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* Copyright (C) 2013 Cogent Embedded, Inc.
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*
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* Author: Valentine Barshak <valentine.barshak@cogentembedded.com>
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*/
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/of_address.h>
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#include <linux/of_pci.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/pm_runtime.h>
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#include <linux/sizes.h>
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#include <linux/slab.h>
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#include "../pci.h"
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/* AHB-PCI Bridge PCI communication registers */
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#define RCAR_AHBPCI_PCICOM_OFFSET 0x800
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#define RCAR_PCIAHB_WIN1_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x00)
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#define RCAR_PCIAHB_WIN2_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x04)
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#define RCAR_PCIAHB_PREFETCH0 0x0
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#define RCAR_PCIAHB_PREFETCH4 0x1
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#define RCAR_PCIAHB_PREFETCH8 0x2
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#define RCAR_PCIAHB_PREFETCH16 0x3
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#define RCAR_AHBPCI_WIN1_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x10)
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#define RCAR_AHBPCI_WIN2_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x14)
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#define RCAR_AHBPCI_WIN_CTR_MEM (3 << 1)
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#define RCAR_AHBPCI_WIN_CTR_CFG (5 << 1)
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#define RCAR_AHBPCI_WIN1_HOST (1 << 30)
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#define RCAR_AHBPCI_WIN1_DEVICE (1 << 31)
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#define RCAR_PCI_INT_ENABLE_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x20)
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#define RCAR_PCI_INT_STATUS_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x24)
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#define RCAR_PCI_INT_SIGTABORT (1 << 0)
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#define RCAR_PCI_INT_SIGRETABORT (1 << 1)
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#define RCAR_PCI_INT_REMABORT (1 << 2)
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#define RCAR_PCI_INT_PERR (1 << 3)
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#define RCAR_PCI_INT_SIGSERR (1 << 4)
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#define RCAR_PCI_INT_RESERR (1 << 5)
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#define RCAR_PCI_INT_WIN1ERR (1 << 12)
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#define RCAR_PCI_INT_WIN2ERR (1 << 13)
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#define RCAR_PCI_INT_A (1 << 16)
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#define RCAR_PCI_INT_B (1 << 17)
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#define RCAR_PCI_INT_PME (1 << 19)
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#define RCAR_PCI_INT_ALLERRORS (RCAR_PCI_INT_SIGTABORT | \
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RCAR_PCI_INT_SIGRETABORT | \
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RCAR_PCI_INT_REMABORT | \
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RCAR_PCI_INT_PERR | \
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RCAR_PCI_INT_SIGSERR | \
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RCAR_PCI_INT_RESERR | \
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RCAR_PCI_INT_WIN1ERR | \
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RCAR_PCI_INT_WIN2ERR)
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#define RCAR_AHB_BUS_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x30)
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#define RCAR_AHB_BUS_MMODE_HTRANS (1 << 0)
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#define RCAR_AHB_BUS_MMODE_BYTE_BURST (1 << 1)
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#define RCAR_AHB_BUS_MMODE_WR_INCR (1 << 2)
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#define RCAR_AHB_BUS_MMODE_HBUS_REQ (1 << 7)
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#define RCAR_AHB_BUS_SMODE_READYCTR (1 << 17)
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#define RCAR_AHB_BUS_MODE (RCAR_AHB_BUS_MMODE_HTRANS | \
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RCAR_AHB_BUS_MMODE_BYTE_BURST | \
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RCAR_AHB_BUS_MMODE_WR_INCR | \
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RCAR_AHB_BUS_MMODE_HBUS_REQ | \
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RCAR_AHB_BUS_SMODE_READYCTR)
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#define RCAR_USBCTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x34)
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#define RCAR_USBCTR_USBH_RST (1 << 0)
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#define RCAR_USBCTR_PCICLK_MASK (1 << 1)
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#define RCAR_USBCTR_PLL_RST (1 << 2)
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#define RCAR_USBCTR_DIRPD (1 << 8)
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#define RCAR_USBCTR_PCIAHB_WIN2_EN (1 << 9)
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#define RCAR_USBCTR_PCIAHB_WIN1_256M (0 << 10)
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#define RCAR_USBCTR_PCIAHB_WIN1_512M (1 << 10)
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#define RCAR_USBCTR_PCIAHB_WIN1_1G (2 << 10)
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#define RCAR_USBCTR_PCIAHB_WIN1_2G (3 << 10)
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#define RCAR_USBCTR_PCIAHB_WIN1_MASK (3 << 10)
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#define RCAR_PCI_ARBITER_CTR_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x40)
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#define RCAR_PCI_ARBITER_PCIREQ0 (1 << 0)
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#define RCAR_PCI_ARBITER_PCIREQ1 (1 << 1)
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#define RCAR_PCI_ARBITER_PCIBP_MODE (1 << 12)
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#define RCAR_PCI_UNIT_REV_REG (RCAR_AHBPCI_PCICOM_OFFSET + 0x48)
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struct rcar_pci {
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struct device *dev;
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void __iomem *reg;
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struct resource mem_res;
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struct resource *cfg_res;
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int irq;
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};
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/* PCI configuration space operations */
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static void __iomem *rcar_pci_cfg_base(struct pci_bus *bus, unsigned int devfn,
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int where)
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{
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struct rcar_pci *priv = bus->sysdata;
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int slot, val;
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if (!pci_is_root_bus(bus) || PCI_FUNC(devfn))
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return NULL;
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/* Only one EHCI/OHCI device built-in */
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slot = PCI_SLOT(devfn);
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if (slot > 2)
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return NULL;
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/* bridge logic only has registers to 0x40 */
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if (slot == 0x0 && where >= 0x40)
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return NULL;
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val = slot ? RCAR_AHBPCI_WIN1_DEVICE | RCAR_AHBPCI_WIN_CTR_CFG :
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RCAR_AHBPCI_WIN1_HOST | RCAR_AHBPCI_WIN_CTR_CFG;
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iowrite32(val, priv->reg + RCAR_AHBPCI_WIN1_CTR_REG);
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return priv->reg + (slot >> 1) * 0x100 + where;
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}
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#ifdef CONFIG_PCI_DEBUG
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/* if debug enabled, then attach an error handler irq to the bridge */
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static irqreturn_t rcar_pci_err_irq(int irq, void *pw)
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{
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struct rcar_pci *priv = pw;
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struct device *dev = priv->dev;
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u32 status = ioread32(priv->reg + RCAR_PCI_INT_STATUS_REG);
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if (status & RCAR_PCI_INT_ALLERRORS) {
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dev_err(dev, "error irq: status %08x\n", status);
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/* clear the error(s) */
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iowrite32(status & RCAR_PCI_INT_ALLERRORS,
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priv->reg + RCAR_PCI_INT_STATUS_REG);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static void rcar_pci_setup_errirq(struct rcar_pci *priv)
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{
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struct device *dev = priv->dev;
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int ret;
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u32 val;
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ret = devm_request_irq(dev, priv->irq, rcar_pci_err_irq,
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IRQF_SHARED, "error irq", priv);
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if (ret) {
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dev_err(dev, "cannot claim IRQ for error handling\n");
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return;
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}
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val = ioread32(priv->reg + RCAR_PCI_INT_ENABLE_REG);
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val |= RCAR_PCI_INT_ALLERRORS;
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iowrite32(val, priv->reg + RCAR_PCI_INT_ENABLE_REG);
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}
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#else
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static inline void rcar_pci_setup_errirq(struct rcar_pci *priv) { }
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#endif
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/* PCI host controller setup */
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static void rcar_pci_setup(struct rcar_pci *priv)
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{
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struct pci_host_bridge *bridge = pci_host_bridge_from_priv(priv);
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struct device *dev = priv->dev;
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void __iomem *reg = priv->reg;
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struct resource_entry *entry;
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unsigned long window_size;
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unsigned long window_addr;
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unsigned long window_pci;
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u32 val;
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entry = resource_list_first_type(&bridge->dma_ranges, IORESOURCE_MEM);
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if (!entry) {
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window_addr = 0x40000000;
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window_pci = 0x40000000;
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window_size = SZ_1G;
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} else {
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window_addr = entry->res->start;
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window_pci = entry->res->start - entry->offset;
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window_size = resource_size(entry->res);
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}
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pm_runtime_enable(dev);
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pm_runtime_get_sync(dev);
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val = ioread32(reg + RCAR_PCI_UNIT_REV_REG);
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dev_info(dev, "PCI: revision %x\n", val);
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/* Disable Direct Power Down State and assert reset */
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val = ioread32(reg + RCAR_USBCTR_REG) & ~RCAR_USBCTR_DIRPD;
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val |= RCAR_USBCTR_USBH_RST | RCAR_USBCTR_PLL_RST;
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iowrite32(val, reg + RCAR_USBCTR_REG);
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udelay(4);
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/* De-assert reset and reset PCIAHB window1 size */
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val &= ~(RCAR_USBCTR_PCIAHB_WIN1_MASK | RCAR_USBCTR_PCICLK_MASK |
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RCAR_USBCTR_USBH_RST | RCAR_USBCTR_PLL_RST);
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/* Setup PCIAHB window1 size */
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switch (window_size) {
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case SZ_2G:
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val |= RCAR_USBCTR_PCIAHB_WIN1_2G;
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break;
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case SZ_1G:
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val |= RCAR_USBCTR_PCIAHB_WIN1_1G;
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break;
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case SZ_512M:
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val |= RCAR_USBCTR_PCIAHB_WIN1_512M;
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break;
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default:
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pr_warn("unknown window size %ld - defaulting to 256M\n",
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window_size);
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window_size = SZ_256M;
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fallthrough;
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case SZ_256M:
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val |= RCAR_USBCTR_PCIAHB_WIN1_256M;
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break;
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}
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iowrite32(val, reg + RCAR_USBCTR_REG);
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/* Configure AHB master and slave modes */
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iowrite32(RCAR_AHB_BUS_MODE, reg + RCAR_AHB_BUS_CTR_REG);
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/* Configure PCI arbiter */
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val = ioread32(reg + RCAR_PCI_ARBITER_CTR_REG);
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val |= RCAR_PCI_ARBITER_PCIREQ0 | RCAR_PCI_ARBITER_PCIREQ1 |
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RCAR_PCI_ARBITER_PCIBP_MODE;
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iowrite32(val, reg + RCAR_PCI_ARBITER_CTR_REG);
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/* PCI-AHB mapping */
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iowrite32(window_addr | RCAR_PCIAHB_PREFETCH16,
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reg + RCAR_PCIAHB_WIN1_CTR_REG);
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/* AHB-PCI mapping: OHCI/EHCI registers */
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val = priv->mem_res.start | RCAR_AHBPCI_WIN_CTR_MEM;
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iowrite32(val, reg + RCAR_AHBPCI_WIN2_CTR_REG);
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/* Enable AHB-PCI bridge PCI configuration access */
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iowrite32(RCAR_AHBPCI_WIN1_HOST | RCAR_AHBPCI_WIN_CTR_CFG,
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reg + RCAR_AHBPCI_WIN1_CTR_REG);
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/* Set PCI-AHB Window1 address */
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iowrite32(window_pci | PCI_BASE_ADDRESS_MEM_PREFETCH,
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reg + PCI_BASE_ADDRESS_1);
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/* Set AHB-PCI bridge PCI communication area address */
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val = priv->cfg_res->start + RCAR_AHBPCI_PCICOM_OFFSET;
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iowrite32(val, reg + PCI_BASE_ADDRESS_0);
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val = ioread32(reg + PCI_COMMAND);
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val |= PCI_COMMAND_SERR | PCI_COMMAND_PARITY |
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PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER;
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iowrite32(val, reg + PCI_COMMAND);
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/* Enable PCI interrupts */
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iowrite32(RCAR_PCI_INT_A | RCAR_PCI_INT_B | RCAR_PCI_INT_PME,
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reg + RCAR_PCI_INT_ENABLE_REG);
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rcar_pci_setup_errirq(priv);
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}
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static struct pci_ops rcar_pci_ops = {
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.map_bus = rcar_pci_cfg_base,
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.read = pci_generic_config_read,
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.write = pci_generic_config_write,
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};
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static int rcar_pci_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *cfg_res, *mem_res;
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struct rcar_pci *priv;
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struct pci_host_bridge *bridge;
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void __iomem *reg;
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bridge = devm_pci_alloc_host_bridge(dev, sizeof(*priv));
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if (!bridge)
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return -ENOMEM;
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priv = pci_host_bridge_priv(bridge);
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bridge->sysdata = priv;
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cfg_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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reg = devm_ioremap_resource(dev, cfg_res);
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if (IS_ERR(reg))
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return PTR_ERR(reg);
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mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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if (!mem_res || !mem_res->start)
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return -ENODEV;
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if (mem_res->start & 0xFFFF)
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return -EINVAL;
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priv->mem_res = *mem_res;
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priv->cfg_res = cfg_res;
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priv->irq = platform_get_irq(pdev, 0);
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priv->reg = reg;
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priv->dev = dev;
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if (priv->irq < 0) {
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dev_err(dev, "no valid irq found\n");
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return priv->irq;
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}
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bridge->ops = &rcar_pci_ops;
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pci_add_flags(PCI_REASSIGN_ALL_BUS);
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rcar_pci_setup(priv);
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return pci_host_probe(bridge);
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}
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static const struct of_device_id rcar_pci_of_match[] = {
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{ .compatible = "renesas,pci-r8a7790", },
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{ .compatible = "renesas,pci-r8a7791", },
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{ .compatible = "renesas,pci-r8a7794", },
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{ .compatible = "renesas,pci-rcar-gen2", },
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{ .compatible = "renesas,pci-rzn1", },
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{ },
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};
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static struct platform_driver rcar_pci_driver = {
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.driver = {
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.name = "pci-rcar-gen2",
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.suppress_bind_attrs = true,
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.of_match_table = rcar_pci_of_match,
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},
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.probe = rcar_pci_probe,
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};
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builtin_platform_driver(rcar_pci_driver);
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