57d1992b39
Use MSI_FLAG_NO_AFFINITY, which keeps .irq_set_affinity() unset and allows migrate_one_irq() to exit right away, without warnings like this: IRQ...: set affinity failed(-22) Remove the .irq_set_affinity() implementation that is no longer needed. Link: https://lore.kernel.org/r/20240723132958.41320-11-marek.vasut+renesas@mailbox.org Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> [bhelgaas: commit log] Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Acked-by: Thomas Gleixner <tglx@linutronix.de>
1170 lines
29 KiB
C
1170 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* PCIe driver for Renesas R-Car SoCs
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* Copyright (C) 2014-2020 Renesas Electronics Europe Ltd
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*
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* Based on:
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* arch/sh/drivers/pci/pcie-sh7786.c
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* arch/sh/drivers/pci/ops-sh7786.c
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* Copyright (C) 2009 - 2011 Paul Mundt
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*
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* Author: Phil Edworthy <phil.edworthy@renesas.com>
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*/
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#include <linux/bitops.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/iopoll.h>
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#include <linux/msi.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/of_platform.h>
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#include <linux/pci.h>
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#include <linux/phy/phy.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/regulator/consumer.h>
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#include "pcie-rcar.h"
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struct rcar_msi {
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DECLARE_BITMAP(used, INT_PCI_MSI_NR);
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struct irq_domain *domain;
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struct mutex map_lock;
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spinlock_t mask_lock;
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int irq1;
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int irq2;
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};
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/* Structure representing the PCIe interface */
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struct rcar_pcie_host {
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struct rcar_pcie pcie;
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struct phy *phy;
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struct clk *bus_clk;
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struct rcar_msi msi;
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int (*phy_init_fn)(struct rcar_pcie_host *host);
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};
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static DEFINE_SPINLOCK(pmsr_lock);
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static int rcar_pcie_wakeup(struct device *pcie_dev, void __iomem *pcie_base)
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{
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unsigned long flags;
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u32 pmsr, val;
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int ret = 0;
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spin_lock_irqsave(&pmsr_lock, flags);
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if (!pcie_base || pm_runtime_suspended(pcie_dev)) {
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ret = -EINVAL;
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goto unlock_exit;
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}
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pmsr = readl(pcie_base + PMSR);
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/*
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* Test if the PCIe controller received PM_ENTER_L1 DLLP and
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* the PCIe controller is not in L1 link state. If true, apply
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* fix, which will put the controller into L1 link state, from
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* which it can return to L0s/L0 on its own.
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*/
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if ((pmsr & PMEL1RX) && ((pmsr & PMSTATE) != PMSTATE_L1)) {
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writel(L1IATN, pcie_base + PMCTLR);
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ret = readl_poll_timeout_atomic(pcie_base + PMSR, val,
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val & L1FAEG, 10, 1000);
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if (ret) {
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dev_warn_ratelimited(pcie_dev,
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"Timeout waiting for L1 link state, ret=%d\n",
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ret);
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}
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writel(L1FAEG | PMEL1RX, pcie_base + PMSR);
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}
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unlock_exit:
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spin_unlock_irqrestore(&pmsr_lock, flags);
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return ret;
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}
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static struct rcar_pcie_host *msi_to_host(struct rcar_msi *msi)
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{
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return container_of(msi, struct rcar_pcie_host, msi);
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}
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static u32 rcar_read_conf(struct rcar_pcie *pcie, int where)
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{
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unsigned int shift = BITS_PER_BYTE * (where & 3);
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u32 val = rcar_pci_read_reg(pcie, where & ~3);
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return val >> shift;
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}
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#ifdef CONFIG_ARM
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#define __rcar_pci_rw_reg_workaround(instr) \
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" .arch armv7-a\n" \
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"1: " instr " %1, [%2]\n" \
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"2: isb\n" \
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"3: .pushsection .text.fixup,\"ax\"\n" \
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" .align 2\n" \
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"4: mov %0, #" __stringify(PCIBIOS_SET_FAILED) "\n" \
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" b 3b\n" \
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" .popsection\n" \
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" .pushsection __ex_table,\"a\"\n" \
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" .align 3\n" \
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" .long 1b, 4b\n" \
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" .long 2b, 4b\n" \
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" .popsection\n"
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#endif
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static int rcar_pci_write_reg_workaround(struct rcar_pcie *pcie, u32 val,
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unsigned int reg)
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{
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int error = PCIBIOS_SUCCESSFUL;
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#ifdef CONFIG_ARM
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asm volatile(
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__rcar_pci_rw_reg_workaround("str")
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: "+r"(error):"r"(val), "r"(pcie->base + reg) : "memory");
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#else
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rcar_pci_write_reg(pcie, val, reg);
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#endif
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return error;
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}
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static int rcar_pci_read_reg_workaround(struct rcar_pcie *pcie, u32 *val,
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unsigned int reg)
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{
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int error = PCIBIOS_SUCCESSFUL;
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#ifdef CONFIG_ARM
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asm volatile(
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__rcar_pci_rw_reg_workaround("ldr")
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: "+r"(error), "=r"(*val) : "r"(pcie->base + reg) : "memory");
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if (error != PCIBIOS_SUCCESSFUL)
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PCI_SET_ERROR_RESPONSE(val);
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#else
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*val = rcar_pci_read_reg(pcie, reg);
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#endif
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return error;
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}
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/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
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static int rcar_pcie_config_access(struct rcar_pcie_host *host,
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unsigned char access_type, struct pci_bus *bus,
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unsigned int devfn, int where, u32 *data)
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{
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struct rcar_pcie *pcie = &host->pcie;
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unsigned int dev, func, reg, index;
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int ret;
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/* Wake the bus up in case it is in L1 state. */
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ret = rcar_pcie_wakeup(pcie->dev, pcie->base);
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if (ret) {
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PCI_SET_ERROR_RESPONSE(data);
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return PCIBIOS_SET_FAILED;
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}
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dev = PCI_SLOT(devfn);
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func = PCI_FUNC(devfn);
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reg = where & ~3;
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index = reg / 4;
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/*
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* While each channel has its own memory-mapped extended config
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* space, it's generally only accessible when in endpoint mode.
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* When in root complex mode, the controller is unable to target
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* itself with either type 0 or type 1 accesses, and indeed, any
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* controller initiated target transfer to its own config space
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* result in a completer abort.
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*
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* Each channel effectively only supports a single device, but as
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* the same channel <-> device access works for any PCI_SLOT()
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* value, we cheat a bit here and bind the controller's config
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* space to devfn 0 in order to enable self-enumeration. In this
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* case the regular ECAR/ECDR path is sidelined and the mangled
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* config access itself is initiated as an internal bus transaction.
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*/
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if (pci_is_root_bus(bus)) {
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if (dev != 0)
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return PCIBIOS_DEVICE_NOT_FOUND;
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if (access_type == RCAR_PCI_ACCESS_READ)
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*data = rcar_pci_read_reg(pcie, PCICONF(index));
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else
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rcar_pci_write_reg(pcie, *data, PCICONF(index));
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return PCIBIOS_SUCCESSFUL;
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}
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/* Clear errors */
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rcar_pci_write_reg(pcie, rcar_pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);
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/* Set the PIO address */
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rcar_pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) |
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PCIE_CONF_DEV(dev) | PCIE_CONF_FUNC(func) | reg, PCIECAR);
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/* Enable the configuration access */
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if (pci_is_root_bus(bus->parent))
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rcar_pci_write_reg(pcie, PCIECCTLR_CCIE | TYPE0, PCIECCTLR);
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else
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rcar_pci_write_reg(pcie, PCIECCTLR_CCIE | TYPE1, PCIECCTLR);
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/* Check for errors */
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if (rcar_pci_read_reg(pcie, PCIEERRFR) & UNSUPPORTED_REQUEST)
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return PCIBIOS_DEVICE_NOT_FOUND;
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/* Check for master and target aborts */
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if (rcar_read_conf(pcie, RCONF(PCI_STATUS)) &
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(PCI_STATUS_REC_MASTER_ABORT | PCI_STATUS_REC_TARGET_ABORT))
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return PCIBIOS_DEVICE_NOT_FOUND;
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if (access_type == RCAR_PCI_ACCESS_READ)
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ret = rcar_pci_read_reg_workaround(pcie, data, PCIECDR);
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else
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ret = rcar_pci_write_reg_workaround(pcie, *data, PCIECDR);
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/* Disable the configuration access */
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rcar_pci_write_reg(pcie, 0, PCIECCTLR);
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return ret;
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}
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static int rcar_pcie_read_conf(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 *val)
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{
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struct rcar_pcie_host *host = bus->sysdata;
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int ret;
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ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
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bus, devfn, where, val);
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if (ret != PCIBIOS_SUCCESSFUL)
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return ret;
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if (size == 1)
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*val = (*val >> (BITS_PER_BYTE * (where & 3))) & 0xff;
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else if (size == 2)
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*val = (*val >> (BITS_PER_BYTE * (where & 2))) & 0xffff;
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dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
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bus->number, devfn, where, size, *val);
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return ret;
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}
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/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
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static int rcar_pcie_write_conf(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 val)
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{
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struct rcar_pcie_host *host = bus->sysdata;
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unsigned int shift;
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u32 data;
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int ret;
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ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_READ,
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bus, devfn, where, &data);
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if (ret != PCIBIOS_SUCCESSFUL)
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return ret;
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dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x where=0x%04x size=%d val=0x%08x\n",
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bus->number, devfn, where, size, val);
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if (size == 1) {
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shift = BITS_PER_BYTE * (where & 3);
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data &= ~(0xff << shift);
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data |= ((val & 0xff) << shift);
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} else if (size == 2) {
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shift = BITS_PER_BYTE * (where & 2);
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data &= ~(0xffff << shift);
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data |= ((val & 0xffff) << shift);
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} else
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data = val;
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ret = rcar_pcie_config_access(host, RCAR_PCI_ACCESS_WRITE,
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bus, devfn, where, &data);
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return ret;
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}
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static struct pci_ops rcar_pcie_ops = {
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.read = rcar_pcie_read_conf,
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.write = rcar_pcie_write_conf,
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};
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static void rcar_pcie_force_speedup(struct rcar_pcie *pcie)
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{
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struct device *dev = pcie->dev;
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unsigned int timeout = 1000;
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u32 macsr;
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if ((rcar_pci_read_reg(pcie, MACS2R) & LINK_SPEED) != LINK_SPEED_5_0GTS)
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return;
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if (rcar_pci_read_reg(pcie, MACCTLR) & SPEED_CHANGE) {
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dev_err(dev, "Speed change already in progress\n");
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return;
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}
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macsr = rcar_pci_read_reg(pcie, MACSR);
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if ((macsr & LINK_SPEED) == LINK_SPEED_5_0GTS)
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goto done;
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/* Set target link speed to 5.0 GT/s */
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rcar_rmw32(pcie, EXPCAP(12), PCI_EXP_LNKSTA_CLS,
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PCI_EXP_LNKSTA_CLS_5_0GB);
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/* Set speed change reason as intentional factor */
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rcar_rmw32(pcie, MACCGSPSETR, SPCNGRSN, 0);
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/* Clear SPCHGFIN, SPCHGSUC, and SPCHGFAIL */
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if (macsr & (SPCHGFIN | SPCHGSUC | SPCHGFAIL))
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rcar_pci_write_reg(pcie, macsr, MACSR);
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/* Start link speed change */
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rcar_rmw32(pcie, MACCTLR, SPEED_CHANGE, SPEED_CHANGE);
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while (timeout--) {
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macsr = rcar_pci_read_reg(pcie, MACSR);
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if (macsr & SPCHGFIN) {
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/* Clear the interrupt bits */
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rcar_pci_write_reg(pcie, macsr, MACSR);
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if (macsr & SPCHGFAIL)
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dev_err(dev, "Speed change failed\n");
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goto done;
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}
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msleep(1);
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}
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dev_err(dev, "Speed change timed out\n");
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done:
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dev_info(dev, "Current link speed is %s GT/s\n",
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(macsr & LINK_SPEED) == LINK_SPEED_5_0GTS ? "5" : "2.5");
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}
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static void rcar_pcie_hw_enable(struct rcar_pcie_host *host)
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{
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struct rcar_pcie *pcie = &host->pcie;
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struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
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struct resource_entry *win;
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LIST_HEAD(res);
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int i = 0;
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/* Try setting 5 GT/s link speed */
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rcar_pcie_force_speedup(pcie);
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/* Setup PCI resources */
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resource_list_for_each_entry(win, &bridge->windows) {
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struct resource *res = win->res;
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if (!res->flags)
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continue;
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switch (resource_type(res)) {
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case IORESOURCE_IO:
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case IORESOURCE_MEM:
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rcar_pcie_set_outbound(pcie, i, win);
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i++;
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break;
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}
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}
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}
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static int rcar_pcie_enable(struct rcar_pcie_host *host)
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{
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struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
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rcar_pcie_hw_enable(host);
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pci_add_flags(PCI_REASSIGN_ALL_BUS);
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bridge->sysdata = host;
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bridge->ops = &rcar_pcie_ops;
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return pci_host_probe(bridge);
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}
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static int phy_wait_for_ack(struct rcar_pcie *pcie)
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{
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struct device *dev = pcie->dev;
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unsigned int timeout = 100;
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while (timeout--) {
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if (rcar_pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
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return 0;
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udelay(100);
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}
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dev_err(dev, "Access to PCIe phy timed out\n");
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return -ETIMEDOUT;
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}
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static void phy_write_reg(struct rcar_pcie *pcie,
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unsigned int rate, u32 addr,
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unsigned int lane, u32 data)
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{
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u32 phyaddr;
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phyaddr = WRITE_CMD |
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((rate & 1) << RATE_POS) |
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((lane & 0xf) << LANE_POS) |
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((addr & 0xff) << ADR_POS);
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/* Set write data */
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rcar_pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
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rcar_pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR);
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/* Ignore errors as they will be dealt with if the data link is down */
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phy_wait_for_ack(pcie);
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/* Clear command */
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rcar_pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
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rcar_pci_write_reg(pcie, 0, H1_PCIEPHYADRR);
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/* Ignore errors as they will be dealt with if the data link is down */
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phy_wait_for_ack(pcie);
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}
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static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
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{
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int err;
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/* Begin initialization */
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rcar_pci_write_reg(pcie, 0, PCIETCTLR);
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/* Set mode */
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rcar_pci_write_reg(pcie, 1, PCIEMSR);
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err = rcar_pcie_wait_for_phyrdy(pcie);
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if (err)
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return err;
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|
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/*
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* Initial header for port config space is type 1, set the device
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* class to match. Hardware takes care of propagating the IDSETR
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* settings, so there is no need to bother with a quirk.
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*/
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rcar_pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI_NORMAL << 8, IDSETR1);
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/*
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* Setup Secondary Bus Number & Subordinate Bus Number, even though
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* they aren't used, to avoid bridge being detected as broken.
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*/
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rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
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rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
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/* Initialize default capabilities. */
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rcar_rmw32(pcie, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
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rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS),
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PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
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rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), PCI_HEADER_TYPE_MASK,
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PCI_HEADER_TYPE_BRIDGE);
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/* Enable data link layer active state reporting */
|
|
rcar_rmw32(pcie, REXPCAP(PCI_EXP_LNKCAP), PCI_EXP_LNKCAP_DLLLARC,
|
|
PCI_EXP_LNKCAP_DLLLARC);
|
|
|
|
/* Write out the physical slot number = 0 */
|
|
rcar_rmw32(pcie, REXPCAP(PCI_EXP_SLTCAP), PCI_EXP_SLTCAP_PSN, 0);
|
|
|
|
/* Set the completion timer timeout to the maximum 50ms. */
|
|
rcar_rmw32(pcie, TLCTLR + 1, 0x3f, 50);
|
|
|
|
/* Terminate list of capabilities (Next Capability Offset=0) */
|
|
rcar_rmw32(pcie, RVCCAP(0), 0xfff00000, 0);
|
|
|
|
/* Enable MSI */
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
rcar_pci_write_reg(pcie, 0x801f0000, PCIEMSITXR);
|
|
|
|
rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR);
|
|
|
|
/* Finish initialization - establish a PCI Express link */
|
|
rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
|
|
|
|
/* This will timeout if we don't have a link. */
|
|
err = rcar_pcie_wait_for_dl(pcie);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Enable INTx interrupts */
|
|
rcar_rmw32(pcie, PCIEINTXR, 0, 0xF << 8);
|
|
|
|
wmb();
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_pcie_phy_init_h1(struct rcar_pcie_host *host)
|
|
{
|
|
struct rcar_pcie *pcie = &host->pcie;
|
|
|
|
/* Initialize the phy */
|
|
phy_write_reg(pcie, 0, 0x42, 0x1, 0x0EC34191);
|
|
phy_write_reg(pcie, 1, 0x42, 0x1, 0x0EC34180);
|
|
phy_write_reg(pcie, 0, 0x43, 0x1, 0x00210188);
|
|
phy_write_reg(pcie, 1, 0x43, 0x1, 0x00210188);
|
|
phy_write_reg(pcie, 0, 0x44, 0x1, 0x015C0014);
|
|
phy_write_reg(pcie, 1, 0x44, 0x1, 0x015C0014);
|
|
phy_write_reg(pcie, 1, 0x4C, 0x1, 0x786174A0);
|
|
phy_write_reg(pcie, 1, 0x4D, 0x1, 0x048000BB);
|
|
phy_write_reg(pcie, 0, 0x51, 0x1, 0x079EC062);
|
|
phy_write_reg(pcie, 0, 0x52, 0x1, 0x20000000);
|
|
phy_write_reg(pcie, 1, 0x52, 0x1, 0x20000000);
|
|
phy_write_reg(pcie, 1, 0x56, 0x1, 0x00003806);
|
|
|
|
phy_write_reg(pcie, 0, 0x60, 0x1, 0x004B03A5);
|
|
phy_write_reg(pcie, 0, 0x64, 0x1, 0x3F0F1F0F);
|
|
phy_write_reg(pcie, 0, 0x66, 0x1, 0x00008000);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_pcie_phy_init_gen2(struct rcar_pcie_host *host)
|
|
{
|
|
struct rcar_pcie *pcie = &host->pcie;
|
|
|
|
/*
|
|
* These settings come from the R-Car Series, 2nd Generation User's
|
|
* Manual, section 50.3.1 (2) Initialization of the physical layer.
|
|
*/
|
|
rcar_pci_write_reg(pcie, 0x000f0030, GEN2_PCIEPHYADDR);
|
|
rcar_pci_write_reg(pcie, 0x00381203, GEN2_PCIEPHYDATA);
|
|
rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
|
|
rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
|
|
|
|
rcar_pci_write_reg(pcie, 0x000f0054, GEN2_PCIEPHYADDR);
|
|
/* The following value is for DC connection, no termination resistor */
|
|
rcar_pci_write_reg(pcie, 0x13802007, GEN2_PCIEPHYDATA);
|
|
rcar_pci_write_reg(pcie, 0x00000001, GEN2_PCIEPHYCTRL);
|
|
rcar_pci_write_reg(pcie, 0x00000006, GEN2_PCIEPHYCTRL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_pcie_phy_init_gen3(struct rcar_pcie_host *host)
|
|
{
|
|
int err;
|
|
|
|
err = phy_init(host->phy);
|
|
if (err)
|
|
return err;
|
|
|
|
err = phy_power_on(host->phy);
|
|
if (err)
|
|
phy_exit(host->phy);
|
|
|
|
return err;
|
|
}
|
|
|
|
static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
|
|
{
|
|
struct rcar_pcie_host *host = data;
|
|
struct rcar_pcie *pcie = &host->pcie;
|
|
struct rcar_msi *msi = &host->msi;
|
|
struct device *dev = pcie->dev;
|
|
unsigned long reg;
|
|
|
|
reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
|
|
|
|
/* MSI & INTx share an interrupt - we only handle MSI here */
|
|
if (!reg)
|
|
return IRQ_NONE;
|
|
|
|
while (reg) {
|
|
unsigned int index = find_first_bit(®, 32);
|
|
int ret;
|
|
|
|
ret = generic_handle_domain_irq(msi->domain->parent, index);
|
|
if (ret) {
|
|
/* Unknown MSI, just clear it */
|
|
dev_dbg(dev, "unexpected MSI\n");
|
|
rcar_pci_write_reg(pcie, BIT(index), PCIEMSIFR);
|
|
}
|
|
|
|
/* see if there's any more pending in this vector */
|
|
reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static void rcar_msi_top_irq_ack(struct irq_data *d)
|
|
{
|
|
irq_chip_ack_parent(d);
|
|
}
|
|
|
|
static void rcar_msi_top_irq_mask(struct irq_data *d)
|
|
{
|
|
pci_msi_mask_irq(d);
|
|
irq_chip_mask_parent(d);
|
|
}
|
|
|
|
static void rcar_msi_top_irq_unmask(struct irq_data *d)
|
|
{
|
|
pci_msi_unmask_irq(d);
|
|
irq_chip_unmask_parent(d);
|
|
}
|
|
|
|
static struct irq_chip rcar_msi_top_chip = {
|
|
.name = "PCIe MSI",
|
|
.irq_ack = rcar_msi_top_irq_ack,
|
|
.irq_mask = rcar_msi_top_irq_mask,
|
|
.irq_unmask = rcar_msi_top_irq_unmask,
|
|
};
|
|
|
|
static void rcar_msi_irq_ack(struct irq_data *d)
|
|
{
|
|
struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
|
|
struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
|
|
|
|
/* clear the interrupt */
|
|
rcar_pci_write_reg(pcie, BIT(d->hwirq), PCIEMSIFR);
|
|
}
|
|
|
|
static void rcar_msi_irq_mask(struct irq_data *d)
|
|
{
|
|
struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
|
|
struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
|
|
unsigned long flags;
|
|
u32 value;
|
|
|
|
spin_lock_irqsave(&msi->mask_lock, flags);
|
|
value = rcar_pci_read_reg(pcie, PCIEMSIIER);
|
|
value &= ~BIT(d->hwirq);
|
|
rcar_pci_write_reg(pcie, value, PCIEMSIIER);
|
|
spin_unlock_irqrestore(&msi->mask_lock, flags);
|
|
}
|
|
|
|
static void rcar_msi_irq_unmask(struct irq_data *d)
|
|
{
|
|
struct rcar_msi *msi = irq_data_get_irq_chip_data(d);
|
|
struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
|
|
unsigned long flags;
|
|
u32 value;
|
|
|
|
spin_lock_irqsave(&msi->mask_lock, flags);
|
|
value = rcar_pci_read_reg(pcie, PCIEMSIIER);
|
|
value |= BIT(d->hwirq);
|
|
rcar_pci_write_reg(pcie, value, PCIEMSIIER);
|
|
spin_unlock_irqrestore(&msi->mask_lock, flags);
|
|
}
|
|
|
|
static void rcar_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
|
|
{
|
|
struct rcar_msi *msi = irq_data_get_irq_chip_data(data);
|
|
struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
|
|
|
|
msg->address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
|
|
msg->address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
|
|
msg->data = data->hwirq;
|
|
}
|
|
|
|
static struct irq_chip rcar_msi_bottom_chip = {
|
|
.name = "R-Car MSI",
|
|
.irq_ack = rcar_msi_irq_ack,
|
|
.irq_mask = rcar_msi_irq_mask,
|
|
.irq_unmask = rcar_msi_irq_unmask,
|
|
.irq_compose_msi_msg = rcar_compose_msi_msg,
|
|
};
|
|
|
|
static int rcar_msi_domain_alloc(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs, void *args)
|
|
{
|
|
struct rcar_msi *msi = domain->host_data;
|
|
unsigned int i;
|
|
int hwirq;
|
|
|
|
mutex_lock(&msi->map_lock);
|
|
|
|
hwirq = bitmap_find_free_region(msi->used, INT_PCI_MSI_NR, order_base_2(nr_irqs));
|
|
|
|
mutex_unlock(&msi->map_lock);
|
|
|
|
if (hwirq < 0)
|
|
return -ENOSPC;
|
|
|
|
for (i = 0; i < nr_irqs; i++)
|
|
irq_domain_set_info(domain, virq + i, hwirq + i,
|
|
&rcar_msi_bottom_chip, domain->host_data,
|
|
handle_edge_irq, NULL, NULL);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rcar_msi_domain_free(struct irq_domain *domain, unsigned int virq,
|
|
unsigned int nr_irqs)
|
|
{
|
|
struct irq_data *d = irq_domain_get_irq_data(domain, virq);
|
|
struct rcar_msi *msi = domain->host_data;
|
|
|
|
mutex_lock(&msi->map_lock);
|
|
|
|
bitmap_release_region(msi->used, d->hwirq, order_base_2(nr_irqs));
|
|
|
|
mutex_unlock(&msi->map_lock);
|
|
}
|
|
|
|
static const struct irq_domain_ops rcar_msi_domain_ops = {
|
|
.alloc = rcar_msi_domain_alloc,
|
|
.free = rcar_msi_domain_free,
|
|
};
|
|
|
|
static struct msi_domain_info rcar_msi_info = {
|
|
.flags = MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
|
|
MSI_FLAG_NO_AFFINITY | MSI_FLAG_MULTI_PCI_MSI,
|
|
.chip = &rcar_msi_top_chip,
|
|
};
|
|
|
|
static int rcar_allocate_domains(struct rcar_msi *msi)
|
|
{
|
|
struct rcar_pcie *pcie = &msi_to_host(msi)->pcie;
|
|
struct fwnode_handle *fwnode = dev_fwnode(pcie->dev);
|
|
struct irq_domain *parent;
|
|
|
|
parent = irq_domain_create_linear(fwnode, INT_PCI_MSI_NR,
|
|
&rcar_msi_domain_ops, msi);
|
|
if (!parent) {
|
|
dev_err(pcie->dev, "failed to create IRQ domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
irq_domain_update_bus_token(parent, DOMAIN_BUS_NEXUS);
|
|
|
|
msi->domain = pci_msi_create_irq_domain(fwnode, &rcar_msi_info, parent);
|
|
if (!msi->domain) {
|
|
dev_err(pcie->dev, "failed to create MSI domain\n");
|
|
irq_domain_remove(parent);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rcar_free_domains(struct rcar_msi *msi)
|
|
{
|
|
struct irq_domain *parent = msi->domain->parent;
|
|
|
|
irq_domain_remove(msi->domain);
|
|
irq_domain_remove(parent);
|
|
}
|
|
|
|
static int rcar_pcie_enable_msi(struct rcar_pcie_host *host)
|
|
{
|
|
struct rcar_pcie *pcie = &host->pcie;
|
|
struct device *dev = pcie->dev;
|
|
struct rcar_msi *msi = &host->msi;
|
|
struct resource res;
|
|
int err;
|
|
|
|
mutex_init(&msi->map_lock);
|
|
spin_lock_init(&msi->mask_lock);
|
|
|
|
err = of_address_to_resource(dev->of_node, 0, &res);
|
|
if (err)
|
|
return err;
|
|
|
|
err = rcar_allocate_domains(msi);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Two irqs are for MSI, but they are also used for non-MSI irqs */
|
|
err = devm_request_irq(dev, msi->irq1, rcar_pcie_msi_irq,
|
|
IRQF_SHARED | IRQF_NO_THREAD,
|
|
rcar_msi_bottom_chip.name, host);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to request IRQ: %d\n", err);
|
|
goto err;
|
|
}
|
|
|
|
err = devm_request_irq(dev, msi->irq2, rcar_pcie_msi_irq,
|
|
IRQF_SHARED | IRQF_NO_THREAD,
|
|
rcar_msi_bottom_chip.name, host);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to request IRQ: %d\n", err);
|
|
goto err;
|
|
}
|
|
|
|
/* disable all MSIs */
|
|
rcar_pci_write_reg(pcie, 0, PCIEMSIIER);
|
|
|
|
/*
|
|
* Setup MSI data target using RC base address address, which
|
|
* is guaranteed to be in the low 32bit range on any R-Car HW.
|
|
*/
|
|
rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
|
|
rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
rcar_free_domains(msi);
|
|
return err;
|
|
}
|
|
|
|
static void rcar_pcie_teardown_msi(struct rcar_pcie_host *host)
|
|
{
|
|
struct rcar_pcie *pcie = &host->pcie;
|
|
|
|
/* Disable all MSI interrupts */
|
|
rcar_pci_write_reg(pcie, 0, PCIEMSIIER);
|
|
|
|
/* Disable address decoding of the MSI interrupt, MSIFE */
|
|
rcar_pci_write_reg(pcie, 0, PCIEMSIALR);
|
|
|
|
rcar_free_domains(&host->msi);
|
|
}
|
|
|
|
static int rcar_pcie_get_resources(struct rcar_pcie_host *host)
|
|
{
|
|
struct rcar_pcie *pcie = &host->pcie;
|
|
struct device *dev = pcie->dev;
|
|
struct resource res;
|
|
int err, i;
|
|
|
|
host->phy = devm_phy_optional_get(dev, "pcie");
|
|
if (IS_ERR(host->phy))
|
|
return PTR_ERR(host->phy);
|
|
|
|
err = of_address_to_resource(dev->of_node, 0, &res);
|
|
if (err)
|
|
return err;
|
|
|
|
pcie->base = devm_ioremap_resource(dev, &res);
|
|
if (IS_ERR(pcie->base))
|
|
return PTR_ERR(pcie->base);
|
|
|
|
host->bus_clk = devm_clk_get(dev, "pcie_bus");
|
|
if (IS_ERR(host->bus_clk)) {
|
|
dev_err(dev, "cannot get pcie bus clock\n");
|
|
return PTR_ERR(host->bus_clk);
|
|
}
|
|
|
|
i = irq_of_parse_and_map(dev->of_node, 0);
|
|
if (!i) {
|
|
dev_err(dev, "cannot get platform resources for msi interrupt\n");
|
|
err = -ENOENT;
|
|
goto err_irq1;
|
|
}
|
|
host->msi.irq1 = i;
|
|
|
|
i = irq_of_parse_and_map(dev->of_node, 1);
|
|
if (!i) {
|
|
dev_err(dev, "cannot get platform resources for msi interrupt\n");
|
|
err = -ENOENT;
|
|
goto err_irq2;
|
|
}
|
|
host->msi.irq2 = i;
|
|
|
|
return 0;
|
|
|
|
err_irq2:
|
|
irq_dispose_mapping(host->msi.irq1);
|
|
err_irq1:
|
|
return err;
|
|
}
|
|
|
|
static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
|
|
struct resource_entry *entry,
|
|
int *index)
|
|
{
|
|
u64 restype = entry->res->flags;
|
|
u64 cpu_addr = entry->res->start;
|
|
u64 cpu_end = entry->res->end;
|
|
u64 pci_addr = entry->res->start - entry->offset;
|
|
u32 flags = LAM_64BIT | LAR_ENABLE;
|
|
u64 mask;
|
|
u64 size = resource_size(entry->res);
|
|
int idx = *index;
|
|
|
|
if (restype & IORESOURCE_PREFETCH)
|
|
flags |= LAM_PREFETCH;
|
|
|
|
while (cpu_addr < cpu_end) {
|
|
if (idx >= MAX_NR_INBOUND_MAPS - 1) {
|
|
dev_err(pcie->dev, "Failed to map inbound regions!\n");
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* If the size of the range is larger than the alignment of
|
|
* the start address, we have to use multiple entries to
|
|
* perform the mapping.
|
|
*/
|
|
if (cpu_addr > 0) {
|
|
unsigned long nr_zeros = __ffs64(cpu_addr);
|
|
u64 alignment = 1ULL << nr_zeros;
|
|
|
|
size = min(size, alignment);
|
|
}
|
|
/* Hardware supports max 4GiB inbound region */
|
|
size = min(size, 1ULL << 32);
|
|
|
|
mask = roundup_pow_of_two(size) - 1;
|
|
mask &= ~0xf;
|
|
|
|
rcar_pcie_set_inbound(pcie, cpu_addr, pci_addr,
|
|
lower_32_bits(mask) | flags, idx, true);
|
|
|
|
pci_addr += size;
|
|
cpu_addr += size;
|
|
idx += 2;
|
|
}
|
|
*index = idx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie_host *host)
|
|
{
|
|
struct pci_host_bridge *bridge = pci_host_bridge_from_priv(host);
|
|
struct resource_entry *entry;
|
|
int index = 0, err = 0;
|
|
|
|
resource_list_for_each_entry(entry, &bridge->dma_ranges) {
|
|
err = rcar_pcie_inbound_ranges(&host->pcie, entry, &index);
|
|
if (err)
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const struct of_device_id rcar_pcie_of_match[] = {
|
|
{ .compatible = "renesas,pcie-r8a7779",
|
|
.data = rcar_pcie_phy_init_h1 },
|
|
{ .compatible = "renesas,pcie-r8a7790",
|
|
.data = rcar_pcie_phy_init_gen2 },
|
|
{ .compatible = "renesas,pcie-r8a7791",
|
|
.data = rcar_pcie_phy_init_gen2 },
|
|
{ .compatible = "renesas,pcie-rcar-gen2",
|
|
.data = rcar_pcie_phy_init_gen2 },
|
|
{ .compatible = "renesas,pcie-r8a7795",
|
|
.data = rcar_pcie_phy_init_gen3 },
|
|
{ .compatible = "renesas,pcie-rcar-gen3",
|
|
.data = rcar_pcie_phy_init_gen3 },
|
|
{},
|
|
};
|
|
|
|
/* Design note 346 from Linear Technology says order is not important. */
|
|
static const char * const rcar_pcie_supplies[] = {
|
|
"vpcie1v5",
|
|
"vpcie3v3",
|
|
"vpcie12v",
|
|
};
|
|
|
|
static int rcar_pcie_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct pci_host_bridge *bridge;
|
|
struct rcar_pcie_host *host;
|
|
struct rcar_pcie *pcie;
|
|
unsigned int i;
|
|
u32 data;
|
|
int err;
|
|
|
|
bridge = devm_pci_alloc_host_bridge(dev, sizeof(*host));
|
|
if (!bridge)
|
|
return -ENOMEM;
|
|
|
|
host = pci_host_bridge_priv(bridge);
|
|
pcie = &host->pcie;
|
|
pcie->dev = dev;
|
|
platform_set_drvdata(pdev, host);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(rcar_pcie_supplies); i++) {
|
|
err = devm_regulator_get_enable_optional(dev, rcar_pcie_supplies[i]);
|
|
if (err < 0 && err != -ENODEV)
|
|
return dev_err_probe(dev, err, "failed to enable regulator: %s\n",
|
|
rcar_pcie_supplies[i]);
|
|
}
|
|
|
|
pm_runtime_enable(pcie->dev);
|
|
err = pm_runtime_get_sync(pcie->dev);
|
|
if (err < 0) {
|
|
dev_err(pcie->dev, "pm_runtime_get_sync failed\n");
|
|
goto err_pm_put;
|
|
}
|
|
|
|
err = rcar_pcie_get_resources(host);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to request resources: %d\n", err);
|
|
goto err_pm_put;
|
|
}
|
|
|
|
err = clk_prepare_enable(host->bus_clk);
|
|
if (err) {
|
|
dev_err(dev, "failed to enable bus clock: %d\n", err);
|
|
goto err_unmap_msi_irqs;
|
|
}
|
|
|
|
err = rcar_pcie_parse_map_dma_ranges(host);
|
|
if (err)
|
|
goto err_clk_disable;
|
|
|
|
host->phy_init_fn = of_device_get_match_data(dev);
|
|
err = host->phy_init_fn(host);
|
|
if (err) {
|
|
dev_err(dev, "failed to init PCIe PHY\n");
|
|
goto err_clk_disable;
|
|
}
|
|
|
|
/* Failure to get a link might just be that no cards are inserted */
|
|
if (rcar_pcie_hw_init(pcie)) {
|
|
dev_info(dev, "PCIe link down\n");
|
|
err = -ENODEV;
|
|
goto err_phy_shutdown;
|
|
}
|
|
|
|
data = rcar_pci_read_reg(pcie, MACSR);
|
|
dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
|
|
|
|
if (IS_ENABLED(CONFIG_PCI_MSI)) {
|
|
err = rcar_pcie_enable_msi(host);
|
|
if (err < 0) {
|
|
dev_err(dev,
|
|
"failed to enable MSI support: %d\n",
|
|
err);
|
|
goto err_phy_shutdown;
|
|
}
|
|
}
|
|
|
|
err = rcar_pcie_enable(host);
|
|
if (err)
|
|
goto err_msi_teardown;
|
|
|
|
return 0;
|
|
|
|
err_msi_teardown:
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
rcar_pcie_teardown_msi(host);
|
|
|
|
err_phy_shutdown:
|
|
if (host->phy) {
|
|
phy_power_off(host->phy);
|
|
phy_exit(host->phy);
|
|
}
|
|
|
|
err_clk_disable:
|
|
clk_disable_unprepare(host->bus_clk);
|
|
|
|
err_unmap_msi_irqs:
|
|
irq_dispose_mapping(host->msi.irq2);
|
|
irq_dispose_mapping(host->msi.irq1);
|
|
|
|
err_pm_put:
|
|
pm_runtime_put(dev);
|
|
pm_runtime_disable(dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int rcar_pcie_resume(struct device *dev)
|
|
{
|
|
struct rcar_pcie_host *host = dev_get_drvdata(dev);
|
|
struct rcar_pcie *pcie = &host->pcie;
|
|
unsigned int data;
|
|
int err;
|
|
|
|
err = rcar_pcie_parse_map_dma_ranges(host);
|
|
if (err)
|
|
return 0;
|
|
|
|
/* Failure to get a link might just be that no cards are inserted */
|
|
err = host->phy_init_fn(host);
|
|
if (err) {
|
|
dev_info(dev, "PCIe link down\n");
|
|
return 0;
|
|
}
|
|
|
|
data = rcar_pci_read_reg(pcie, MACSR);
|
|
dev_info(dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
|
|
|
|
/* Enable MSI */
|
|
if (IS_ENABLED(CONFIG_PCI_MSI)) {
|
|
struct resource res;
|
|
u32 val;
|
|
|
|
of_address_to_resource(dev->of_node, 0, &res);
|
|
rcar_pci_write_reg(pcie, upper_32_bits(res.start), PCIEMSIAUR);
|
|
rcar_pci_write_reg(pcie, lower_32_bits(res.start) | MSIFE, PCIEMSIALR);
|
|
|
|
bitmap_to_arr32(&val, host->msi.used, INT_PCI_MSI_NR);
|
|
rcar_pci_write_reg(pcie, val, PCIEMSIIER);
|
|
}
|
|
|
|
rcar_pcie_hw_enable(host);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_pcie_resume_noirq(struct device *dev)
|
|
{
|
|
struct rcar_pcie_host *host = dev_get_drvdata(dev);
|
|
struct rcar_pcie *pcie = &host->pcie;
|
|
|
|
if (rcar_pci_read_reg(pcie, PMSR) &&
|
|
!(rcar_pci_read_reg(pcie, PCIETCTLR) & DL_DOWN))
|
|
return 0;
|
|
|
|
/* Re-establish the PCIe link */
|
|
rcar_pci_write_reg(pcie, MACCTLR_INIT_VAL, MACCTLR);
|
|
rcar_pci_write_reg(pcie, CFINIT, PCIETCTLR);
|
|
return rcar_pcie_wait_for_dl(pcie);
|
|
}
|
|
|
|
static const struct dev_pm_ops rcar_pcie_pm_ops = {
|
|
SYSTEM_SLEEP_PM_OPS(NULL, rcar_pcie_resume)
|
|
.resume_noirq = rcar_pcie_resume_noirq,
|
|
};
|
|
|
|
static struct platform_driver rcar_pcie_driver = {
|
|
.driver = {
|
|
.name = "rcar-pcie",
|
|
.of_match_table = rcar_pcie_of_match,
|
|
.pm = &rcar_pcie_pm_ops,
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
.probe = rcar_pcie_probe,
|
|
};
|
|
|
|
#ifdef CONFIG_ARM
|
|
static int rcar_pcie_aarch32_abort_handler(unsigned long addr,
|
|
unsigned int fsr, struct pt_regs *regs)
|
|
{
|
|
return !fixup_exception(regs);
|
|
}
|
|
|
|
static const struct of_device_id rcar_pcie_abort_handler_of_match[] __initconst = {
|
|
{ .compatible = "renesas,pcie-r8a7779" },
|
|
{ .compatible = "renesas,pcie-r8a7790" },
|
|
{ .compatible = "renesas,pcie-r8a7791" },
|
|
{ .compatible = "renesas,pcie-rcar-gen2" },
|
|
{},
|
|
};
|
|
|
|
static int __init rcar_pcie_init(void)
|
|
{
|
|
if (of_find_matching_node(NULL, rcar_pcie_abort_handler_of_match)) {
|
|
#ifdef CONFIG_ARM_LPAE
|
|
hook_fault_code(17, rcar_pcie_aarch32_abort_handler, SIGBUS, 0,
|
|
"asynchronous external abort");
|
|
#else
|
|
hook_fault_code(22, rcar_pcie_aarch32_abort_handler, SIGBUS, 0,
|
|
"imprecise external abort");
|
|
#endif
|
|
}
|
|
|
|
return platform_driver_register(&rcar_pcie_driver);
|
|
}
|
|
device_initcall(rcar_pcie_init);
|
|
#else
|
|
builtin_platform_driver(rcar_pcie_driver);
|
|
#endif
|