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PCI: rcar: Add Renesas R-Car PCIe driver
This PCIe Host driver currently does not support MSI, so cards fall back to INTx interrupts. Signed-off-by: Phil Edworthy <phil.edworthy@renesas.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Simon Horman <horms+renesas@verge.net.au>
This commit is contained in:
Phil Edworthy
Bjorn Helgaas
parent
b9bfe1bca8
commit
c25da47788
3 changed files with 775 additions and 0 deletions
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@ -33,4 +33,10 @@ config PCI_RCAR_GEN2
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There are 3 internal PCI controllers available with a single
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built-in EHCI/OHCI host controller present on each one.
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config PCI_RCAR_GEN2_PCIE
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bool "Renesas R-Car PCIe controller"
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depends on ARCH_SHMOBILE || (ARM && COMPILE_TEST)
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help
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Say Y here if you want PCIe controller support on R-Car Gen2 SoCs.
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endmenu
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@ -4,3 +4,4 @@ obj-$(CONFIG_PCI_IMX6) += pci-imx6.o
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obj-$(CONFIG_PCI_MVEBU) += pci-mvebu.o
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obj-$(CONFIG_PCI_TEGRA) += pci-tegra.o
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obj-$(CONFIG_PCI_RCAR_GEN2) += pci-rcar-gen2.o
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obj-$(CONFIG_PCI_RCAR_GEN2_PCIE) += pcie-rcar.o
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768
drivers/pci/host/pcie-rcar.c
Normal file
768
drivers/pci/host/pcie-rcar.c
Normal file
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@ -0,0 +1,768 @@
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/*
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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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* 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/kernel.h>
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#include <linux/module.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/slab.h>
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#define DRV_NAME "rcar-pcie"
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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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/* 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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/* 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 PCIEPARL(x) (0x03400 + ((x) * 0x20))
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#define PCIEPARH(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 MACCTLR 0x011058
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#define SCRAMBLE_DISABLE (1 << 27)
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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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#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 PCI_MAX_RESOURCES 4
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#define MAX_NR_INBOUND_MAPS 6
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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 resource res[PCI_MAX_RESOURCES];
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struct resource busn;
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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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};
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static inline struct rcar_pcie *sys_to_pcie(struct pci_sys_data *sys)
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{
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return sys->private_data;
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}
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static void 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 pci_read_reg(struct rcar_pcie *pcie, 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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PCI_ACCESS_READ,
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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 = pci_read_reg(pcie, where & ~3);
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val &= ~(mask << shift);
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val |= data << shift;
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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 = 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 == PCI_ACCESS_READ) {
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*data = 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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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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pci_write_reg(pcie, pci_read_reg(pcie, PCIEERRFR), PCIEERRFR);
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/* Set the PIO address */
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pci_write_reg(pcie, PCIE_CONF_BUS(bus->number) | PCIE_CONF_DEV(dev) |
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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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pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE0, PCIECCTLR);
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else
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pci_write_reg(pcie, CONFIG_SEND_ENABLE | TYPE1, PCIECCTLR);
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/* Check for errors */
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if (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 == PCI_ACCESS_READ)
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*data = pci_read_reg(pcie, PCIECDR);
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else
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pci_write_reg(pcie, *data, PCIECDR);
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/* Disable the configuration access */
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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 = sys_to_pcie(bus->sysdata);
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int ret;
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if ((size == 2) && (where & 1))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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else if ((size == 4) && (where & 3))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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ret = rcar_pcie_config_access(pcie, 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 "
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"where=0x%04x size=%d val=0x%08lx\n", bus->number,
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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 = sys_to_pcie(bus->sysdata);
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int shift, ret;
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u32 data;
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if ((size == 2) && (where & 1))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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else if ((size == 4) && (where & 3))
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return PCIBIOS_BAD_REGISTER_NUMBER;
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ret = rcar_pcie_config_access(pcie, 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 "
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"where=0x%04x size=%d val=0x%08lx\n", bus->number,
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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, 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 resource *res,
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struct rcar_pcie *pcie)
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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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u32 mask;
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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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pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
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pci_write_reg(pcie, upper_32_bits(res->start), PCIEPARH(win));
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pci_write_reg(pcie, lower_32_bits(res->start), PCIEPARL(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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pci_write_reg(pcie, mask, PCIEPTCTLR(win));
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}
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static int rcar_pcie_setup(int nr, struct pci_sys_data *sys)
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{
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struct rcar_pcie *pcie = sys_to_pcie(sys);
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struct resource *res;
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int i;
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pcie->root_bus_nr = -1;
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/* Setup PCI resources */
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for (i = 0; i < PCI_MAX_RESOURCES; i++) {
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res = &pcie->res[i];
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if (!res->flags)
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continue;
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rcar_pcie_setup_window(i, res, pcie);
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if (res->flags & IORESOURCE_IO)
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pci_ioremap_io(nr * SZ_64K, res->start);
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else
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pci_add_resource(&sys->resources, res);
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}
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pci_add_resource(&sys->resources, &pcie->busn);
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return 1;
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}
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struct hw_pci rcar_pci = {
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.setup = rcar_pcie_setup,
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.map_irq = of_irq_parse_and_map_pci,
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.ops = &rcar_pcie_ops,
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};
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static void rcar_pcie_enable(struct rcar_pcie *pcie)
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{
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struct platform_device *pdev = to_platform_device(pcie->dev);
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rcar_pci.nr_controllers = 1;
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rcar_pci.private_data = (void **)&pcie;
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pci_common_init_dev(&pdev->dev, &rcar_pci);
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#ifdef CONFIG_PCI_DOMAINS
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rcar_pci.domain++;
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#endif
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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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unsigned int timeout = 100;
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while (timeout--) {
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if (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(pcie->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, unsigned int addr,
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unsigned int lane, unsigned int data)
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{
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unsigned long 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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pci_write_reg(pcie, data, H1_PCIEPHYDOUTR);
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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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pci_write_reg(pcie, 0, H1_PCIEPHYDOUTR);
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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_wait_for_dl(struct rcar_pcie *pcie)
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{
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unsigned int timeout = 10;
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while (timeout--) {
|
||||
if ((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 */
|
||||
pci_write_reg(pcie, 0, PCIETCTLR);
|
||||
|
||||
/* Set mode */
|
||||
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.
|
||||
*/
|
||||
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), 0, 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), 0, 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), 0xfff0, 0);
|
||||
|
||||
/* Enable MAC data scrambling. */
|
||||
rcar_rmw32(pcie, MACCTLR, SCRAMBLE_DISABLE, 0);
|
||||
|
||||
/* Finish initialization - establish a PCI Express link */
|
||||
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);
|
||||
|
||||
/* Enable slave Bus Mastering */
|
||||
rcar_rmw32(pcie, RCONF(PCI_STATUS), PCI_STATUS_DEVSEL_MASK,
|
||||
PCI_COMMAND_IO | PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER |
|
||||
PCI_STATUS_CAP_LIST | PCI_STATUS_DEVSEL_FAST);
|
||||
|
||||
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 (pci_read_reg(pcie, H1_PCIEPHYSR))
|
||||
return rcar_pcie_hw_init(pcie);
|
||||
|
||||
msleep(5);
|
||||
}
|
||||
|
||||
return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
static int rcar_pcie_get_resources(struct platform_device *pdev,
|
||||
struct rcar_pcie *pcie)
|
||||
{
|
||||
struct resource res;
|
||||
int err;
|
||||
|
||||
err = of_address_to_resource(pdev->dev.of_node, 0, &res);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
pcie->clk = devm_clk_get(&pdev->dev, "pcie");
|
||||
if (IS_ERR(pcie->clk)) {
|
||||
dev_err(pcie->dev, "cannot get platform clock\n");
|
||||
return PTR_ERR(pcie->clk);
|
||||
}
|
||||
err = clk_prepare_enable(pcie->clk);
|
||||
if (err)
|
||||
goto fail_clk;
|
||||
|
||||
pcie->bus_clk = devm_clk_get(&pdev->dev, "pcie_bus");
|
||||
if (IS_ERR(pcie->bus_clk)) {
|
||||
dev_err(pcie->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 err_map_reg;
|
||||
|
||||
pcie->base = devm_ioremap_resource(&pdev->dev, &res);
|
||||
if (IS_ERR(pcie->base)) {
|
||||
err = PTR_ERR(pcie->base);
|
||||
goto err_map_reg;
|
||||
}
|
||||
|
||||
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.
|
||||
*/
|
||||
pci_write_reg(pcie, lower_32_bits(pci_addr), PCIEPRAR(idx));
|
||||
pci_write_reg(pcie, lower_32_bits(cpu_addr), PCIELAR(idx));
|
||||
pci_write_reg(pcie, lower_32_bits(mask) | flags, PCIELAMR(idx));
|
||||
|
||||
pci_write_reg(pcie, upper_32_bits(pci_addr), PCIEPRAR(idx+1));
|
||||
pci_write_reg(pcie, upper_32_bits(cpu_addr), PCIELAR(idx+1));
|
||||
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 pci_dma_range_parser_init(struct of_pci_range_parser *parser,
|
||||
struct device_node *node)
|
||||
{
|
||||
const int na = 3, ns = 2;
|
||||
int rlen;
|
||||
|
||||
parser->node = node;
|
||||
parser->pna = of_n_addr_cells(node);
|
||||
parser->np = parser->pna + na + ns;
|
||||
|
||||
parser->range = of_get_property(node, "dma-ranges", &rlen);
|
||||
if (!parser->range)
|
||||
return -ENOENT;
|
||||
|
||||
parser->end = parser->range + rlen / sizeof(__be32);
|
||||
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 (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 },
|
||||
{ .compatible = "renesas,pcie-r8a7791", .data = rcar_pcie_hw_init },
|
||||
{},
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, rcar_pcie_of_match);
|
||||
|
||||
static int rcar_pcie_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct rcar_pcie *pcie;
|
||||
unsigned int data;
|
||||
struct of_pci_range range;
|
||||
struct of_pci_range_parser parser;
|
||||
const struct of_device_id *of_id;
|
||||
int err, win = 0;
|
||||
int (*hw_init_fn)(struct rcar_pcie *);
|
||||
|
||||
pcie = devm_kzalloc(&pdev->dev, sizeof(*pcie), GFP_KERNEL);
|
||||
if (!pcie)
|
||||
return -ENOMEM;
|
||||
|
||||
pcie->dev = &pdev->dev;
|
||||
platform_set_drvdata(pdev, pcie);
|
||||
|
||||
/* Get the bus range */
|
||||
if (of_pci_parse_bus_range(pdev->dev.of_node, &pcie->busn)) {
|
||||
dev_err(&pdev->dev, "failed to parse bus-range property\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (of_pci_range_parser_init(&parser, pdev->dev.of_node)) {
|
||||
dev_err(&pdev->dev, "missing ranges property\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
err = rcar_pcie_get_resources(pdev, pcie);
|
||||
if (err < 0) {
|
||||
dev_err(&pdev->dev, "failed to request resources: %d\n", err);
|
||||
return err;
|
||||
}
|
||||
|
||||
for_each_of_pci_range(&parser, &range) {
|
||||
of_pci_range_to_resource(&range, pdev->dev.of_node,
|
||||
&pcie->res[win++]);
|
||||
|
||||
if (win > PCI_MAX_RESOURCES)
|
||||
break;
|
||||
}
|
||||
|
||||
err = rcar_pcie_parse_map_dma_ranges(pcie, pdev->dev.of_node);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
of_id = of_match_device(rcar_pcie_of_match, pcie->dev);
|
||||
if (!of_id || !of_id->data)
|
||||
return -EINVAL;
|
||||
hw_init_fn = of_id->data;
|
||||
|
||||
/* Failure to get a link might just be that no cards are inserted */
|
||||
err = hw_init_fn(pcie);
|
||||
if (err) {
|
||||
dev_info(&pdev->dev, "PCIe link down\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
data = pci_read_reg(pcie, MACSR);
|
||||
dev_info(&pdev->dev, "PCIe x%d: link up\n", (data >> 20) & 0x3f);
|
||||
|
||||
rcar_pcie_enable(pcie);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver rcar_pcie_driver = {
|
||||
.driver = {
|
||||
.name = DRV_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = rcar_pcie_of_match,
|
||||
.suppress_bind_attrs = true,
|
||||
},
|
||||
.probe = rcar_pcie_probe,
|
||||
};
|
||||
module_platform_driver(rcar_pcie_driver);
|
||||
|
||||
MODULE_AUTHOR("Phil Edworthy <phil.edworthy@renesas.com>");
|
||||
MODULE_DESCRIPTION("Renesas R-Car PCIe driver");
|
||||
MODULE_LICENSE("GPLv2");
|
||||
Loading…
Reference in a new issue