![Geert Uytterhoeven](/assets/img/avatar_default.png)
If CONFIG_DEBUG_SLAB=y, and no PCIe card is inserted, the kernel crashes
during probe on r8a7791/koelsch:
rcar-pcie fe000000.pcie: PCIe link down
Unable to handle kernel paging request at virtual address 6b6b6b6b
(seeing this message requires earlycon and keep_bootcon).
Indeed, pci_free_host_bridge() frees the PCI host bridge, including the
embedded rcar_pcie object, so pci_free_resource_list() must not be called
afterwards.
To fix this, move the call to pci_free_resource_list() up, and update the
label name accordingly.
Fixes: ddd535f1ea
("PCI: rcar: Fix memory leak when no PCIe card is inserted")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Simon Horman <horms+renesas@verge.net.au>
Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
1195 lines
29 KiB
C
1195 lines
29 KiB
C
/*
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* PCIe driver for Renesas R-Car SoCs
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* Copyright (C) 2014 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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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*/
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#include <linux/clk.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/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_pci.h>
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#include <linux/of_platform.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/slab.h>
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#define PCIECAR 0x000010
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#define PCIECCTLR 0x000018
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#define CONFIG_SEND_ENABLE (1 << 31)
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#define TYPE0 (0 << 8)
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#define TYPE1 (1 << 8)
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#define PCIECDR 0x000020
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#define PCIEMSR 0x000028
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#define PCIEINTXR 0x000400
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#define PCIEMSITXR 0x000840
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/* Transfer control */
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#define PCIETCTLR 0x02000
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#define CFINIT 1
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#define PCIETSTR 0x02004
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#define DATA_LINK_ACTIVE 1
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#define PCIEERRFR 0x02020
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#define UNSUPPORTED_REQUEST (1 << 4)
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#define PCIEMSIFR 0x02044
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#define PCIEMSIALR 0x02048
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#define MSIFE 1
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#define PCIEMSIAUR 0x0204c
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#define PCIEMSIIER 0x02050
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/* root port address */
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#define PCIEPRAR(x) (0x02080 + ((x) * 0x4))
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/* local address reg & mask */
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#define PCIELAR(x) (0x02200 + ((x) * 0x20))
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#define PCIELAMR(x) (0x02208 + ((x) * 0x20))
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#define LAM_PREFETCH (1 << 3)
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#define LAM_64BIT (1 << 2)
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#define LAR_ENABLE (1 << 1)
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/* PCIe address reg & mask */
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#define PCIEPALR(x) (0x03400 + ((x) * 0x20))
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#define PCIEPAUR(x) (0x03404 + ((x) * 0x20))
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#define PCIEPAMR(x) (0x03408 + ((x) * 0x20))
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#define PCIEPTCTLR(x) (0x0340c + ((x) * 0x20))
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#define PAR_ENABLE (1 << 31)
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#define IO_SPACE (1 << 8)
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/* Configuration */
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#define PCICONF(x) (0x010000 + ((x) * 0x4))
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#define PMCAP(x) (0x010040 + ((x) * 0x4))
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#define EXPCAP(x) (0x010070 + ((x) * 0x4))
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#define VCCAP(x) (0x010100 + ((x) * 0x4))
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/* link layer */
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#define IDSETR1 0x011004
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#define TLCTLR 0x011048
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#define MACSR 0x011054
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#define SPCHGFIN (1 << 4)
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#define SPCHGFAIL (1 << 6)
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#define SPCHGSUC (1 << 7)
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#define LINK_SPEED (0xf << 16)
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#define LINK_SPEED_2_5GTS (1 << 16)
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#define LINK_SPEED_5_0GTS (2 << 16)
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#define MACCTLR 0x011058
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#define SPEED_CHANGE (1 << 24)
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#define SCRAMBLE_DISABLE (1 << 27)
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#define MACS2R 0x011078
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#define MACCGSPSETR 0x011084
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#define SPCNGRSN (1 << 31)
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/* R-Car H1 PHY */
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#define H1_PCIEPHYADRR 0x04000c
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#define WRITE_CMD (1 << 16)
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#define PHY_ACK (1 << 24)
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#define RATE_POS 12
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#define LANE_POS 8
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#define ADR_POS 0
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#define H1_PCIEPHYDOUTR 0x040014
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#define H1_PCIEPHYSR 0x040018
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/* R-Car Gen2 PHY */
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#define GEN2_PCIEPHYADDR 0x780
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#define GEN2_PCIEPHYDATA 0x784
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#define GEN2_PCIEPHYCTRL 0x78c
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#define INT_PCI_MSI_NR 32
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#define RCONF(x) (PCICONF(0)+(x))
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#define RPMCAP(x) (PMCAP(0)+(x))
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#define REXPCAP(x) (EXPCAP(0)+(x))
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#define RVCCAP(x) (VCCAP(0)+(x))
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#define PCIE_CONF_BUS(b) (((b) & 0xff) << 24)
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#define PCIE_CONF_DEV(d) (((d) & 0x1f) << 19)
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#define PCIE_CONF_FUNC(f) (((f) & 0x7) << 16)
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#define RCAR_PCI_MAX_RESOURCES 4
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#define MAX_NR_INBOUND_MAPS 6
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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 msi_controller chip;
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unsigned long pages;
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struct mutex lock;
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int irq1;
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int irq2;
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};
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static inline struct rcar_msi *to_rcar_msi(struct msi_controller *chip)
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{
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return container_of(chip, struct rcar_msi, chip);
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}
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/* Structure representing the PCIe interface */
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struct rcar_pcie {
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struct device *dev;
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void __iomem *base;
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struct list_head resources;
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int root_bus_nr;
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struct clk *clk;
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struct clk *bus_clk;
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struct rcar_msi msi;
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};
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static void rcar_pci_write_reg(struct rcar_pcie *pcie, unsigned long val,
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unsigned long reg)
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{
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writel(val, pcie->base + reg);
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}
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static unsigned long rcar_pci_read_reg(struct rcar_pcie *pcie,
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unsigned long reg)
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{
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return readl(pcie->base + reg);
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}
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enum {
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RCAR_PCI_ACCESS_READ,
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RCAR_PCI_ACCESS_WRITE,
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};
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static void rcar_rmw32(struct rcar_pcie *pcie, int where, u32 mask, u32 data)
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{
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int shift = 8 * (where & 3);
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u32 val = rcar_pci_read_reg(pcie, where & ~3);
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val &= ~(mask << shift);
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val |= data << shift;
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rcar_pci_write_reg(pcie, val, where & ~3);
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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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int shift = 8 * (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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/* Serialization is provided by 'pci_lock' in drivers/pci/access.c */
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static int rcar_pcie_config_access(struct rcar_pcie *pcie,
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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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int dev, func, reg, index;
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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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/* Keep an eye out for changes to the root bus number */
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if (pci_is_root_bus(bus) && (reg == PCI_PRIMARY_BUS))
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pcie->root_bus_nr = *data & 0xff;
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rcar_pci_write_reg(pcie, *data, PCICONF(index));
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}
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return PCIBIOS_SUCCESSFUL;
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}
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if (pcie->root_bus_nr < 0)
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return PCIBIOS_DEVICE_NOT_FOUND;
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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 (bus->parent->number == pcie->root_bus_nr)
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rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR);
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else
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rcar_pci_write_reg(pcie, CONFIG_SEND_ENABLE | 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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*data = rcar_pci_read_reg(pcie, PCIECDR);
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else
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rcar_pci_write_reg(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 PCIBIOS_SUCCESSFUL;
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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 *pcie = bus->sysdata;
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int ret;
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ret = rcar_pcie_config_access(pcie, RCAR_PCI_ACCESS_READ,
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bus, devfn, where, val);
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if (ret != PCIBIOS_SUCCESSFUL) {
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*val = 0xffffffff;
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return ret;
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}
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if (size == 1)
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*val = (*val >> (8 * (where & 3))) & 0xff;
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else if (size == 2)
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*val = (*val >> (8 * (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%08lx\n",
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bus->number, devfn, where, size, (unsigned long)*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 *pcie = bus->sysdata;
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int shift, ret;
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u32 data;
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ret = rcar_pcie_config_access(pcie, 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%08lx\n",
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bus->number, devfn, where, size, (unsigned long)val);
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if (size == 1) {
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shift = 8 * (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 = 8 * (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(pcie, 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_setup_window(int win, struct rcar_pcie *pcie,
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struct resource *res)
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{
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/* Setup PCIe address space mappings for each resource */
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resource_size_t size;
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resource_size_t res_start;
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u32 mask;
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rcar_pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win));
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/*
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* The PAMR mask is calculated in units of 128Bytes, which
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* keeps things pretty simple.
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*/
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size = resource_size(res);
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mask = (roundup_pow_of_two(size) / SZ_128) - 1;
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rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
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if (res->flags & IORESOURCE_IO)
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res_start = pci_pio_to_address(res->start);
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else
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res_start = res->start;
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rcar_pci_write_reg(pcie, upper_32_bits(res_start), PCIEPAUR(win));
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rcar_pci_write_reg(pcie, lower_32_bits(res_start) & ~0x7F,
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PCIEPALR(win));
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/* First resource is for IO */
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mask = PAR_ENABLE;
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if (res->flags & IORESOURCE_IO)
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mask |= IO_SPACE;
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rcar_pci_write_reg(pcie, mask, PCIEPTCTLR(win));
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}
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static int rcar_pcie_setup(struct list_head *resource, struct rcar_pcie *pci)
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{
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struct resource_entry *win;
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int i = 0;
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/* Setup PCI resources */
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resource_list_for_each_entry(win, &pci->resources) {
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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_setup_window(i, pci, res);
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i++;
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break;
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case IORESOURCE_BUS:
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pci->root_bus_nr = res->start;
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break;
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default:
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continue;
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}
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pci_add_resource(resource, res);
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}
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return 1;
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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 int rcar_pcie_enable(struct rcar_pcie *pcie)
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{
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struct device *dev = pcie->dev;
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struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
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struct pci_bus *bus, *child;
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int ret;
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/* Try setting 5 GT/s link speed */
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rcar_pcie_force_speedup(pcie);
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rcar_pcie_setup(&bridge->windows, pcie);
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|
|
pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
|
|
|
|
bridge->dev.parent = dev;
|
|
bridge->sysdata = pcie;
|
|
bridge->busnr = pcie->root_bus_nr;
|
|
bridge->ops = &rcar_pcie_ops;
|
|
bridge->map_irq = of_irq_parse_and_map_pci;
|
|
bridge->swizzle_irq = pci_common_swizzle;
|
|
if (IS_ENABLED(CONFIG_PCI_MSI))
|
|
bridge->msi = &pcie->msi.chip;
|
|
|
|
ret = pci_scan_root_bus_bridge(bridge);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
bus = bridge->bus;
|
|
|
|
pci_bus_size_bridges(bus);
|
|
pci_bus_assign_resources(bus);
|
|
|
|
list_for_each_entry(child, &bus->children, node)
|
|
pcie_bus_configure_settings(child);
|
|
|
|
pci_bus_add_devices(bus);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int phy_wait_for_ack(struct rcar_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
unsigned int timeout = 100;
|
|
|
|
while (timeout--) {
|
|
if (rcar_pci_read_reg(pcie, H1_PCIEPHYADRR) & PHY_ACK)
|
|
return 0;
|
|
|
|
udelay(100);
|
|
}
|
|
|
|
dev_err(dev, "Access to PCIe phy timed out\n");
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static void phy_write_reg(struct rcar_pcie *pcie,
|
|
unsigned int rate, unsigned int addr,
|
|
unsigned int lane, unsigned int data)
|
|
{
|
|
unsigned long phyaddr;
|
|
|
|
phyaddr = WRITE_CMD |
|
|
((rate & 1) << RATE_POS) |
|
|
((lane & 0xf) << LANE_POS) |
|
|
((addr & 0xff) << ADR_POS);
|
|
|
|
/* Set write data */
|
|
rcar_pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
|
|
rcar_pci_write_reg(pcie, phyaddr, H1_PCIEPHYADRR);
|
|
|
|
/* Ignore errors as they will be dealt with if the data link is down */
|
|
phy_wait_for_ack(pcie);
|
|
|
|
/* Clear command */
|
|
rcar_pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
|
|
rcar_pci_write_reg(pcie, 0, H1_PCIEPHYADRR);
|
|
|
|
/* Ignore errors as they will be dealt with if the data link is down */
|
|
phy_wait_for_ack(pcie);
|
|
}
|
|
|
|
static int rcar_pcie_wait_for_dl(struct rcar_pcie *pcie)
|
|
{
|
|
unsigned int timeout = 10;
|
|
|
|
while (timeout--) {
|
|
if ((rcar_pci_read_reg(pcie, PCIETSTR) & DATA_LINK_ACTIVE))
|
|
return 0;
|
|
|
|
msleep(5);
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int rcar_pcie_hw_init(struct rcar_pcie *pcie)
|
|
{
|
|
int err;
|
|
|
|
/* Begin initialization */
|
|
rcar_pci_write_reg(pcie, 0, PCIETCTLR);
|
|
|
|
/* Set mode */
|
|
rcar_pci_write_reg(pcie, 1, PCIEMSR);
|
|
|
|
/*
|
|
* Initial header for port config space is type 1, set the device
|
|
* class to match. Hardware takes care of propagating the IDSETR
|
|
* settings, so there is no need to bother with a quirk.
|
|
*/
|
|
rcar_pci_write_reg(pcie, PCI_CLASS_BRIDGE_PCI << 16, IDSETR1);
|
|
|
|
/*
|
|
* Setup Secondary Bus Number & Subordinate Bus Number, even though
|
|
* they aren't used, to avoid bridge being detected as broken.
|
|
*/
|
|
rcar_rmw32(pcie, RCONF(PCI_SECONDARY_BUS), 0xff, 1);
|
|
rcar_rmw32(pcie, RCONF(PCI_SUBORDINATE_BUS), 0xff, 1);
|
|
|
|
/* Initialize default capabilities. */
|
|
rcar_rmw32(pcie, REXPCAP(0), 0xff, PCI_CAP_ID_EXP);
|
|
rcar_rmw32(pcie, REXPCAP(PCI_EXP_FLAGS),
|
|
PCI_EXP_FLAGS_TYPE, PCI_EXP_TYPE_ROOT_PORT << 4);
|
|
rcar_rmw32(pcie, RCONF(PCI_HEADER_TYPE), 0x7f,
|
|
PCI_HEADER_TYPE_BRIDGE);
|
|
|
|
/* 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);
|
|
|
|
/* 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_hw_init_h1(struct rcar_pcie *pcie)
|
|
{
|
|
unsigned int timeout = 10;
|
|
|
|
/* 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);
|
|
|
|
while (timeout--) {
|
|
if (rcar_pci_read_reg(pcie, H1_PCIEPHYSR))
|
|
return rcar_pcie_hw_init(pcie);
|
|
|
|
msleep(5);
|
|
}
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int rcar_pcie_hw_init_gen2(struct rcar_pcie *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 rcar_pcie_hw_init(pcie);
|
|
}
|
|
|
|
static int rcar_msi_alloc(struct rcar_msi *chip)
|
|
{
|
|
int msi;
|
|
|
|
mutex_lock(&chip->lock);
|
|
|
|
msi = find_first_zero_bit(chip->used, INT_PCI_MSI_NR);
|
|
if (msi < INT_PCI_MSI_NR)
|
|
set_bit(msi, chip->used);
|
|
else
|
|
msi = -ENOSPC;
|
|
|
|
mutex_unlock(&chip->lock);
|
|
|
|
return msi;
|
|
}
|
|
|
|
static int rcar_msi_alloc_region(struct rcar_msi *chip, int no_irqs)
|
|
{
|
|
int msi;
|
|
|
|
mutex_lock(&chip->lock);
|
|
msi = bitmap_find_free_region(chip->used, INT_PCI_MSI_NR,
|
|
order_base_2(no_irqs));
|
|
mutex_unlock(&chip->lock);
|
|
|
|
return msi;
|
|
}
|
|
|
|
static void rcar_msi_free(struct rcar_msi *chip, unsigned long irq)
|
|
{
|
|
mutex_lock(&chip->lock);
|
|
clear_bit(irq, chip->used);
|
|
mutex_unlock(&chip->lock);
|
|
}
|
|
|
|
static irqreturn_t rcar_pcie_msi_irq(int irq, void *data)
|
|
{
|
|
struct rcar_pcie *pcie = data;
|
|
struct rcar_msi *msi = &pcie->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);
|
|
unsigned int irq;
|
|
|
|
/* clear the interrupt */
|
|
rcar_pci_write_reg(pcie, 1 << index, PCIEMSIFR);
|
|
|
|
irq = irq_find_mapping(msi->domain, index);
|
|
if (irq) {
|
|
if (test_bit(index, msi->used))
|
|
generic_handle_irq(irq);
|
|
else
|
|
dev_info(dev, "unhandled MSI\n");
|
|
} else {
|
|
/* Unknown MSI, just clear it */
|
|
dev_dbg(dev, "unexpected MSI\n");
|
|
}
|
|
|
|
/* see if there's any more pending in this vector */
|
|
reg = rcar_pci_read_reg(pcie, PCIEMSIFR);
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static int rcar_msi_setup_irq(struct msi_controller *chip, struct pci_dev *pdev,
|
|
struct msi_desc *desc)
|
|
{
|
|
struct rcar_msi *msi = to_rcar_msi(chip);
|
|
struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
|
|
struct msi_msg msg;
|
|
unsigned int irq;
|
|
int hwirq;
|
|
|
|
hwirq = rcar_msi_alloc(msi);
|
|
if (hwirq < 0)
|
|
return hwirq;
|
|
|
|
irq = irq_find_mapping(msi->domain, hwirq);
|
|
if (!irq) {
|
|
rcar_msi_free(msi, hwirq);
|
|
return -EINVAL;
|
|
}
|
|
|
|
irq_set_msi_desc(irq, desc);
|
|
|
|
msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
|
|
msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
|
|
msg.data = hwirq;
|
|
|
|
pci_write_msi_msg(irq, &msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_msi_setup_irqs(struct msi_controller *chip,
|
|
struct pci_dev *pdev, int nvec, int type)
|
|
{
|
|
struct rcar_pcie *pcie = container_of(chip, struct rcar_pcie, msi.chip);
|
|
struct rcar_msi *msi = to_rcar_msi(chip);
|
|
struct msi_desc *desc;
|
|
struct msi_msg msg;
|
|
unsigned int irq;
|
|
int hwirq;
|
|
int i;
|
|
|
|
/* MSI-X interrupts are not supported */
|
|
if (type == PCI_CAP_ID_MSIX)
|
|
return -EINVAL;
|
|
|
|
WARN_ON(!list_is_singular(&pdev->dev.msi_list));
|
|
desc = list_entry(pdev->dev.msi_list.next, struct msi_desc, list);
|
|
|
|
hwirq = rcar_msi_alloc_region(msi, nvec);
|
|
if (hwirq < 0)
|
|
return -ENOSPC;
|
|
|
|
irq = irq_find_mapping(msi->domain, hwirq);
|
|
if (!irq)
|
|
return -ENOSPC;
|
|
|
|
for (i = 0; i < nvec; i++) {
|
|
/*
|
|
* irq_create_mapping() called from rcar_pcie_probe() pre-
|
|
* allocates descs, so there is no need to allocate descs here.
|
|
* We can therefore assume that if irq_find_mapping() above
|
|
* returns non-zero, then the descs are also successfully
|
|
* allocated.
|
|
*/
|
|
if (irq_set_msi_desc_off(irq, i, desc)) {
|
|
/* TODO: clear */
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
desc->nvec_used = nvec;
|
|
desc->msi_attrib.multiple = order_base_2(nvec);
|
|
|
|
msg.address_lo = rcar_pci_read_reg(pcie, PCIEMSIALR) & ~MSIFE;
|
|
msg.address_hi = rcar_pci_read_reg(pcie, PCIEMSIAUR);
|
|
msg.data = hwirq;
|
|
|
|
pci_write_msi_msg(irq, &msg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rcar_msi_teardown_irq(struct msi_controller *chip, unsigned int irq)
|
|
{
|
|
struct rcar_msi *msi = to_rcar_msi(chip);
|
|
struct irq_data *d = irq_get_irq_data(irq);
|
|
|
|
rcar_msi_free(msi, d->hwirq);
|
|
}
|
|
|
|
static struct irq_chip rcar_msi_irq_chip = {
|
|
.name = "R-Car PCIe MSI",
|
|
.irq_enable = pci_msi_unmask_irq,
|
|
.irq_disable = pci_msi_mask_irq,
|
|
.irq_mask = pci_msi_mask_irq,
|
|
.irq_unmask = pci_msi_unmask_irq,
|
|
};
|
|
|
|
static int rcar_msi_map(struct irq_domain *domain, unsigned int irq,
|
|
irq_hw_number_t hwirq)
|
|
{
|
|
irq_set_chip_and_handler(irq, &rcar_msi_irq_chip, handle_simple_irq);
|
|
irq_set_chip_data(irq, domain->host_data);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops msi_domain_ops = {
|
|
.map = rcar_msi_map,
|
|
};
|
|
|
|
static int rcar_pcie_enable_msi(struct rcar_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct rcar_msi *msi = &pcie->msi;
|
|
unsigned long base;
|
|
int err, i;
|
|
|
|
mutex_init(&msi->lock);
|
|
|
|
msi->chip.dev = dev;
|
|
msi->chip.setup_irq = rcar_msi_setup_irq;
|
|
msi->chip.setup_irqs = rcar_msi_setup_irqs;
|
|
msi->chip.teardown_irq = rcar_msi_teardown_irq;
|
|
|
|
msi->domain = irq_domain_add_linear(dev->of_node, INT_PCI_MSI_NR,
|
|
&msi_domain_ops, &msi->chip);
|
|
if (!msi->domain) {
|
|
dev_err(dev, "failed to create IRQ domain\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
for (i = 0; i < INT_PCI_MSI_NR; i++)
|
|
irq_create_mapping(msi->domain, i);
|
|
|
|
/* 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_irq_chip.name, pcie);
|
|
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_irq_chip.name, pcie);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to request IRQ: %d\n", err);
|
|
goto err;
|
|
}
|
|
|
|
/* setup MSI data target */
|
|
msi->pages = __get_free_pages(GFP_KERNEL, 0);
|
|
base = virt_to_phys((void *)msi->pages);
|
|
|
|
rcar_pci_write_reg(pcie, base | MSIFE, PCIEMSIALR);
|
|
rcar_pci_write_reg(pcie, 0, PCIEMSIAUR);
|
|
|
|
/* enable all MSI interrupts */
|
|
rcar_pci_write_reg(pcie, 0xffffffff, PCIEMSIIER);
|
|
|
|
return 0;
|
|
|
|
err:
|
|
irq_domain_remove(msi->domain);
|
|
return err;
|
|
}
|
|
|
|
static int rcar_pcie_get_resources(struct rcar_pcie *pcie)
|
|
{
|
|
struct device *dev = pcie->dev;
|
|
struct resource res;
|
|
int err, i;
|
|
|
|
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);
|
|
|
|
pcie->clk = devm_clk_get(dev, "pcie");
|
|
if (IS_ERR(pcie->clk)) {
|
|
dev_err(dev, "cannot get platform clock\n");
|
|
return PTR_ERR(pcie->clk);
|
|
}
|
|
err = clk_prepare_enable(pcie->clk);
|
|
if (err)
|
|
return err;
|
|
|
|
pcie->bus_clk = devm_clk_get(dev, "pcie_bus");
|
|
if (IS_ERR(pcie->bus_clk)) {
|
|
dev_err(dev, "cannot get pcie bus clock\n");
|
|
err = PTR_ERR(pcie->bus_clk);
|
|
goto fail_clk;
|
|
}
|
|
err = clk_prepare_enable(pcie->bus_clk);
|
|
if (err)
|
|
goto fail_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_map_reg;
|
|
}
|
|
pcie->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_map_reg;
|
|
}
|
|
pcie->msi.irq2 = i;
|
|
|
|
return 0;
|
|
|
|
err_map_reg:
|
|
clk_disable_unprepare(pcie->bus_clk);
|
|
fail_clk:
|
|
clk_disable_unprepare(pcie->clk);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int rcar_pcie_inbound_ranges(struct rcar_pcie *pcie,
|
|
struct of_pci_range *range,
|
|
int *index)
|
|
{
|
|
u64 restype = range->flags;
|
|
u64 cpu_addr = range->cpu_addr;
|
|
u64 cpu_end = range->cpu_addr + range->size;
|
|
u64 pci_addr = range->pci_addr;
|
|
u32 flags = LAM_64BIT | LAR_ENABLE;
|
|
u64 mask;
|
|
u64 size;
|
|
int idx = *index;
|
|
|
|
if (restype & IORESOURCE_PREFETCH)
|
|
flags |= LAM_PREFETCH;
|
|
|
|
/*
|
|
* 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(range->size, alignment);
|
|
} else {
|
|
size = range->size;
|
|
}
|
|
/* Hardware supports max 4GiB inbound region */
|
|
size = min(size, 1ULL << 32);
|
|
|
|
mask = roundup_pow_of_two(size) - 1;
|
|
mask &= ~0xf;
|
|
|
|
while (cpu_addr < cpu_end) {
|
|
/*
|
|
* Set up 64-bit inbound regions as the range parser doesn't
|
|
* distinguish between 32 and 64-bit types.
|
|
*/
|
|
rcar_pci_write_reg(pcie, lower_32_bits(pci_addr),
|
|
PCIEPRAR(idx));
|
|
rcar_pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
|
|
rcar_pci_write_reg(pcie, lower_32_bits(mask) | flags,
|
|
PCIELAMR(idx));
|
|
|
|
rcar_pci_write_reg(pcie, upper_32_bits(pci_addr),
|
|
PCIEPRAR(idx + 1));
|
|
rcar_pci_write_reg(pcie, upper_32_bits(cpu_addr),
|
|
PCIELAR(idx + 1));
|
|
rcar_pci_write_reg(pcie, 0, PCIELAMR(idx + 1));
|
|
|
|
pci_addr += size;
|
|
cpu_addr += size;
|
|
idx += 2;
|
|
|
|
if (idx > MAX_NR_INBOUND_MAPS) {
|
|
dev_err(pcie->dev, "Failed to map inbound regions!\n");
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
*index = idx;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rcar_pcie_parse_map_dma_ranges(struct rcar_pcie *pcie,
|
|
struct device_node *np)
|
|
{
|
|
struct of_pci_range range;
|
|
struct of_pci_range_parser parser;
|
|
int index = 0;
|
|
int err;
|
|
|
|
if (of_pci_dma_range_parser_init(&parser, np))
|
|
return -EINVAL;
|
|
|
|
/* Get the dma-ranges from DT */
|
|
for_each_of_pci_range(&parser, &range) {
|
|
u64 end = range.cpu_addr + range.size - 1;
|
|
|
|
dev_dbg(pcie->dev, "0x%08x 0x%016llx..0x%016llx -> 0x%016llx\n",
|
|
range.flags, range.cpu_addr, end, range.pci_addr);
|
|
|
|
err = rcar_pcie_inbound_ranges(pcie, &range, &index);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id rcar_pcie_of_match[] = {
|
|
{ .compatible = "renesas,pcie-r8a7779", .data = rcar_pcie_hw_init_h1 },
|
|
{ .compatible = "renesas,pcie-r8a7790",
|
|
.data = rcar_pcie_hw_init_gen2 },
|
|
{ .compatible = "renesas,pcie-r8a7791",
|
|
.data = rcar_pcie_hw_init_gen2 },
|
|
{ .compatible = "renesas,pcie-rcar-gen2",
|
|
.data = rcar_pcie_hw_init_gen2 },
|
|
{ .compatible = "renesas,pcie-r8a7795", .data = rcar_pcie_hw_init },
|
|
{ .compatible = "renesas,pcie-rcar-gen3", .data = rcar_pcie_hw_init },
|
|
{},
|
|
};
|
|
|
|
static int rcar_pcie_parse_request_of_pci_ranges(struct rcar_pcie *pci)
|
|
{
|
|
int err;
|
|
struct device *dev = pci->dev;
|
|
struct device_node *np = dev->of_node;
|
|
resource_size_t iobase;
|
|
struct resource_entry *win, *tmp;
|
|
|
|
err = of_pci_get_host_bridge_resources(np, 0, 0xff, &pci->resources,
|
|
&iobase);
|
|
if (err)
|
|
return err;
|
|
|
|
err = devm_request_pci_bus_resources(dev, &pci->resources);
|
|
if (err)
|
|
goto out_release_res;
|
|
|
|
resource_list_for_each_entry_safe(win, tmp, &pci->resources) {
|
|
struct resource *res = win->res;
|
|
|
|
if (resource_type(res) == IORESOURCE_IO) {
|
|
err = pci_remap_iospace(res, iobase);
|
|
if (err) {
|
|
dev_warn(dev, "error %d: failed to map resource %pR\n",
|
|
err, res);
|
|
|
|
resource_list_destroy_entry(win);
|
|
}
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
|
|
out_release_res:
|
|
pci_free_resource_list(&pci->resources);
|
|
return err;
|
|
}
|
|
|
|
static int rcar_pcie_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct rcar_pcie *pcie;
|
|
unsigned int data;
|
|
int err;
|
|
int (*hw_init_fn)(struct rcar_pcie *);
|
|
struct pci_host_bridge *bridge;
|
|
|
|
bridge = pci_alloc_host_bridge(sizeof(*pcie));
|
|
if (!bridge)
|
|
return -ENOMEM;
|
|
|
|
pcie = pci_host_bridge_priv(bridge);
|
|
|
|
pcie->dev = dev;
|
|
|
|
INIT_LIST_HEAD(&pcie->resources);
|
|
|
|
rcar_pcie_parse_request_of_pci_ranges(pcie);
|
|
|
|
err = rcar_pcie_get_resources(pcie);
|
|
if (err < 0) {
|
|
dev_err(dev, "failed to request resources: %d\n", err);
|
|
goto err_free_resource_list;
|
|
}
|
|
|
|
err = rcar_pcie_parse_map_dma_ranges(pcie, dev->of_node);
|
|
if (err)
|
|
goto err_free_resource_list;
|
|
|
|
pm_runtime_enable(dev);
|
|
err = pm_runtime_get_sync(dev);
|
|
if (err < 0) {
|
|
dev_err(dev, "pm_runtime_get_sync failed\n");
|
|
goto err_pm_disable;
|
|
}
|
|
|
|
/* Failure to get a link might just be that no cards are inserted */
|
|
hw_init_fn = of_device_get_match_data(dev);
|
|
err = hw_init_fn(pcie);
|
|
if (err) {
|
|
dev_info(dev, "PCIe link down\n");
|
|
err = -ENODEV;
|
|
goto err_pm_put;
|
|
}
|
|
|
|
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(pcie);
|
|
if (err < 0) {
|
|
dev_err(dev,
|
|
"failed to enable MSI support: %d\n",
|
|
err);
|
|
goto err_pm_put;
|
|
}
|
|
}
|
|
|
|
err = rcar_pcie_enable(pcie);
|
|
if (err)
|
|
goto err_pm_put;
|
|
|
|
return 0;
|
|
|
|
err_pm_put:
|
|
pm_runtime_put(dev);
|
|
|
|
err_pm_disable:
|
|
pm_runtime_disable(dev);
|
|
|
|
err_free_resource_list:
|
|
pci_free_resource_list(&pcie->resources);
|
|
pci_free_host_bridge(bridge);
|
|
|
|
return err;
|
|
}
|
|
|
|
static struct platform_driver rcar_pcie_driver = {
|
|
.driver = {
|
|
.name = "rcar-pcie",
|
|
.of_match_table = rcar_pcie_of_match,
|
|
.suppress_bind_attrs = true,
|
|
},
|
|
.probe = rcar_pcie_probe,
|
|
};
|
|
builtin_platform_driver(rcar_pcie_driver);
|