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PCI: keystone: Add TI Keystone PCIe driver
The Keystone PCIe controller is based on v3.65 version of the Designware
h/w. Main differences are:
1. No ATU support
2. Legacy and MSI IRQ functions are implemented in application register
space
3. MSI interrupts are multiplexed over 8 IRQ lines to the Host side.
All of the application register space handing code is organized into
pci-keystone-dw.c and the functions are called from pci-keystone.c to
implement PCI controller driver. Also add necessary DT documentation and
update the MAINTAINERS file for the driver.
[bhelgaas: spelling and whitespace fixes]
Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
CC: Russell King <linux@arm.linux.org.uk>
CC: Grant Likely <grant.likely@linaro.org>
CC: Rob Herring <robh+dt@kernel.org>
CC: Mohit Kumar <mohit.kumar@st.com>
CC: Pratyush Anand <pratyush.anand@st.com>
CC: Jingoo Han <jg1.han@samsung.com>
CC: Richard Zhu <r65037@freescale.com>
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Marek Vasut <marex@denx.de>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Pawel Moll <pawel.moll@arm.com>
CC: Mark Rutland <mark.rutland@arm.com>
CC: Ian Campbell <ijc+devicetree@hellion.org.uk>
CC: Kumar Gala <galak@codeaurora.org>
CC: Randy Dunlap <rdunlap@infradead.org>
CC: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Murali Karicheri
Bjorn Helgaas
parent
b14a3d1784
commit
0c4ffcfe1f
68
Documentation/devicetree/bindings/pci/pci-keystone.txt
Normal file
68
Documentation/devicetree/bindings/pci/pci-keystone.txt
Normal file
@ -0,0 +1,68 @@
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TI Keystone PCIe interface
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Keystone PCI host Controller is based on Designware PCI h/w version 3.65.
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It shares common functions with PCIe Designware core driver and inherit
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common properties defined in
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Documentation/devicetree/bindings/pci/designware-pci.txt
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Please refer to Documentation/devicetree/bindings/pci/designware-pci.txt
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for the details of Designware DT bindings. Additional properties are
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described here as well as properties that are not applicable.
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Required Properties:-
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compatibility: "ti,keystone-pcie"
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reg: index 1 is the base address and length of DW application registers.
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index 2 is the base address and length of PCI mode configuration
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register.
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index 3 is the base address and length of PCI device ID register.
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pcie_msi_intc : Interrupt controller device node for MSI IRQ chip
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interrupt-cells: should be set to 1
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interrupt-parent: Parent interrupt controller phandle
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interrupts: GIC interrupt lines connected to PCI MSI interrupt lines
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Example:
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pcie_msi_intc: msi-interrupt-controller {
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interrupt-controller;
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#interrupt-cells = <1>;
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interrupt-parent = <&gic>;
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interrupts = <GIC_SPI 30 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 31 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 32 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 33 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 34 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 35 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 36 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 37 IRQ_TYPE_EDGE_RISING>;
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};
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pcie_intc: Interrupt controller device node for Legacy IRQ chip
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interrupt-cells: should be set to 1
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interrupt-parent: Parent interrupt controller phandle
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interrupts: GIC interrupt lines connected to PCI Legacy interrupt lines
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Example:
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pcie_intc: legacy-interrupt-controller {
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interrupt-controller;
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#interrupt-cells = <1>;
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interrupt-parent = <&gic>;
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interrupts = <GIC_SPI 26 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 27 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 28 IRQ_TYPE_EDGE_RISING>,
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<GIC_SPI 29 IRQ_TYPE_EDGE_RISING>;
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};
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Optional properties:-
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phys: phandle to Generic Keystone SerDes phy for PCI
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phy-names: name of the Generic Keystine SerDes phy for PCI
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- If boot loader already does PCI link establishment, then phys and
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phy-names shouldn't be present.
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Designware DT Properties not applicable for Keystone PCI
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1. pcie_bus clock-names not used. Instead, a phandle to phys is used.
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Note for PCI driver usage
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=========================
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Driver requires pci=pcie_bus_perf in the bootargs for proper functioning.
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@ -6876,6 +6876,13 @@ L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
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S: Maintained
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F: drivers/pci/host/*imx6*
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PCI DRIVER FOR TI KEYSTONE
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M: Murali Karicheri <m-karicheri2@ti.com>
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L: linux-pci@vger.kernel.org
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L: linux-arm-kernel@lists.infradead.org (moderated for non-subscribers)
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S: Maintained
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F: drivers/pci/host/*keystone*
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PCI DRIVER FOR MVEBU (Marvell Armada 370 and Armada XP SOC support)
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M: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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M: Jason Cooper <jason@lakedaemon.net>
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@ -63,4 +63,14 @@ config PCIE_SPEAR13XX
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help
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Say Y here if you want PCIe support on SPEAr13XX SoCs.
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config PCI_KEYSTONE
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bool "TI Keystone PCIe controller"
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depends on ARCH_KEYSTONE
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select PCIE_DW
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select PCIEPORTBUS
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help
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Say Y here if you want to enable PCI controller support on Keystone
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SoCs. The PCI controller on Keystone is based on Designware hardware
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and therefore the driver re-uses the Designware core functions to
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implement the driver.
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endmenu
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@ -8,3 +8,4 @@ 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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obj-$(CONFIG_PCI_HOST_GENERIC) += pci-host-generic.o
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obj-$(CONFIG_PCIE_SPEAR13XX) += pcie-spear13xx.o
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obj-$(CONFIG_PCI_KEYSTONE) += pci-keystone-dw.o pci-keystone.o
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516
drivers/pci/host/pci-keystone-dw.c
Normal file
516
drivers/pci/host/pci-keystone-dw.c
Normal file
@ -0,0 +1,516 @@
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/*
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* Designware application register space functions for Keystone PCI controller
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*
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* Copyright (C) 2013-2014 Texas Instruments., Ltd.
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* http://www.ti.com
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*
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* Author: Murali Karicheri <m-karicheri2@ti.com>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/irq.h>
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#include <linux/irqdomain.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_pci.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include "pcie-designware.h"
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#include "pci-keystone.h"
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/* Application register defines */
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#define LTSSM_EN_VAL 1
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#define LTSSM_STATE_MASK 0x1f
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#define LTSSM_STATE_L0 0x11
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#define DBI_CS2_EN_VAL 0x20
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#define OB_XLAT_EN_VAL 2
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/* Application registers */
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#define CMD_STATUS 0x004
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#define CFG_SETUP 0x008
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#define OB_SIZE 0x030
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#define CFG_PCIM_WIN_SZ_IDX 3
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#define CFG_PCIM_WIN_CNT 32
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#define SPACE0_REMOTE_CFG_OFFSET 0x1000
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#define OB_OFFSET_INDEX(n) (0x200 + (8 * n))
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#define OB_OFFSET_HI(n) (0x204 + (8 * n))
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/* IRQ register defines */
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#define IRQ_EOI 0x050
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#define IRQ_STATUS 0x184
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#define IRQ_ENABLE_SET 0x188
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#define IRQ_ENABLE_CLR 0x18c
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#define MSI_IRQ 0x054
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#define MSI0_IRQ_STATUS 0x104
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#define MSI0_IRQ_ENABLE_SET 0x108
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#define MSI0_IRQ_ENABLE_CLR 0x10c
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#define IRQ_STATUS 0x184
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#define MSI_IRQ_OFFSET 4
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/* Config space registers */
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#define DEBUG0 0x728
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#define to_keystone_pcie(x) container_of(x, struct keystone_pcie, pp)
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static inline struct pcie_port *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 inline void update_reg_offset_bit_pos(u32 offset, u32 *reg_offset,
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u32 *bit_pos)
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{
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*reg_offset = offset % 8;
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*bit_pos = offset >> 3;
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}
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u32 ks_dw_pcie_get_msi_data(struct pcie_port *pp)
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{
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struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
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return ks_pcie->app.start + MSI_IRQ;
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}
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void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset)
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{
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struct pcie_port *pp = &ks_pcie->pp;
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u32 pending, vector;
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int src, virq;
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pending = readl(ks_pcie->va_app_base + MSI0_IRQ_STATUS + (offset << 4));
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/*
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* MSI0 status bit 0-3 shows vectors 0, 8, 16, 24, MSI1 status bit
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* shows 1, 9, 17, 25 and so forth
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*/
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for (src = 0; src < 4; src++) {
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if (BIT(src) & pending) {
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vector = offset + (src << 3);
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virq = irq_linear_revmap(pp->irq_domain, vector);
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dev_dbg(pp->dev, "irq: bit %d, vector %d, virq %d\n",
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src, vector, virq);
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generic_handle_irq(virq);
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}
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}
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}
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static void ks_dw_pcie_msi_irq_ack(struct irq_data *d)
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{
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u32 offset, reg_offset, bit_pos;
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struct keystone_pcie *ks_pcie;
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unsigned int irq = d->irq;
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struct msi_desc *msi;
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struct pcie_port *pp;
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msi = irq_get_msi_desc(irq);
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pp = sys_to_pcie(msi->dev->bus->sysdata);
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ks_pcie = to_keystone_pcie(pp);
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offset = irq - irq_linear_revmap(pp->irq_domain, 0);
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update_reg_offset_bit_pos(offset, ®_offset, &bit_pos);
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writel(BIT(bit_pos),
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ks_pcie->va_app_base + MSI0_IRQ_STATUS + (reg_offset << 4));
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writel(reg_offset + MSI_IRQ_OFFSET, ks_pcie->va_app_base + IRQ_EOI);
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}
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void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq)
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{
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u32 reg_offset, bit_pos;
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struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
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update_reg_offset_bit_pos(irq, ®_offset, &bit_pos);
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writel(BIT(bit_pos),
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ks_pcie->va_app_base + MSI0_IRQ_ENABLE_SET + (reg_offset << 4));
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}
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void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq)
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{
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u32 reg_offset, bit_pos;
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struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
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update_reg_offset_bit_pos(irq, ®_offset, &bit_pos);
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writel(BIT(bit_pos),
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ks_pcie->va_app_base + MSI0_IRQ_ENABLE_CLR + (reg_offset << 4));
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}
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static void ks_dw_pcie_msi_irq_mask(struct irq_data *d)
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{
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struct keystone_pcie *ks_pcie;
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unsigned int irq = d->irq;
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struct msi_desc *msi;
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struct pcie_port *pp;
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u32 offset;
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msi = irq_get_msi_desc(irq);
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pp = sys_to_pcie(msi->dev->bus->sysdata);
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ks_pcie = to_keystone_pcie(pp);
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offset = irq - irq_linear_revmap(pp->irq_domain, 0);
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/* Mask the end point if PVM implemented */
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if (IS_ENABLED(CONFIG_PCI_MSI)) {
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if (msi->msi_attrib.maskbit)
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mask_msi_irq(d);
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}
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ks_dw_pcie_msi_clear_irq(pp, offset);
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}
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static void ks_dw_pcie_msi_irq_unmask(struct irq_data *d)
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{
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struct keystone_pcie *ks_pcie;
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unsigned int irq = d->irq;
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struct msi_desc *msi;
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struct pcie_port *pp;
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u32 offset;
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msi = irq_get_msi_desc(irq);
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pp = sys_to_pcie(msi->dev->bus->sysdata);
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ks_pcie = to_keystone_pcie(pp);
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offset = irq - irq_linear_revmap(pp->irq_domain, 0);
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/* Mask the end point if PVM implemented */
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if (IS_ENABLED(CONFIG_PCI_MSI)) {
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if (msi->msi_attrib.maskbit)
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unmask_msi_irq(d);
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}
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ks_dw_pcie_msi_set_irq(pp, offset);
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}
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static struct irq_chip ks_dw_pcie_msi_irq_chip = {
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.name = "Keystone-PCIe-MSI-IRQ",
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.irq_ack = ks_dw_pcie_msi_irq_ack,
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.irq_mask = ks_dw_pcie_msi_irq_mask,
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.irq_unmask = ks_dw_pcie_msi_irq_unmask,
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};
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static int ks_dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
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irq_hw_number_t hwirq)
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{
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irq_set_chip_and_handler(irq, &ks_dw_pcie_msi_irq_chip,
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handle_level_irq);
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irq_set_chip_data(irq, domain->host_data);
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set_irq_flags(irq, IRQF_VALID);
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return 0;
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}
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const struct irq_domain_ops ks_dw_pcie_msi_domain_ops = {
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.map = ks_dw_pcie_msi_map,
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};
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int ks_dw_pcie_msi_host_init(struct pcie_port *pp, struct msi_chip *chip)
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{
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struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
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int i;
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pp->irq_domain = irq_domain_add_linear(ks_pcie->msi_intc_np,
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MAX_MSI_IRQS,
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&ks_dw_pcie_msi_domain_ops,
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chip);
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if (!pp->irq_domain) {
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dev_err(pp->dev, "irq domain init failed\n");
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return -ENXIO;
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}
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for (i = 0; i < MAX_MSI_IRQS; i++)
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irq_create_mapping(pp->irq_domain, i);
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return 0;
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}
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void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie)
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{
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int i;
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for (i = 0; i < MAX_LEGACY_IRQS; i++)
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writel(0x1, ks_pcie->va_app_base + IRQ_ENABLE_SET + (i << 4));
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}
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void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset)
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{
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struct pcie_port *pp = &ks_pcie->pp;
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u32 pending;
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int virq;
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pending = readl(ks_pcie->va_app_base + IRQ_STATUS + (offset << 4));
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if (BIT(0) & pending) {
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virq = irq_linear_revmap(ks_pcie->legacy_irq_domain, offset);
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dev_dbg(pp->dev, ": irq: irq_offset %d, virq %d\n", offset,
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virq);
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generic_handle_irq(virq);
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}
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/* EOI the INTx interrupt */
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writel(offset, ks_pcie->va_app_base + IRQ_EOI);
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}
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static void ks_dw_pcie_ack_legacy_irq(struct irq_data *d)
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{
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}
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static void ks_dw_pcie_mask_legacy_irq(struct irq_data *d)
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{
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}
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static void ks_dw_pcie_unmask_legacy_irq(struct irq_data *d)
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{
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}
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static struct irq_chip ks_dw_pcie_legacy_irq_chip = {
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.name = "Keystone-PCI-Legacy-IRQ",
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.irq_ack = ks_dw_pcie_ack_legacy_irq,
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.irq_mask = ks_dw_pcie_mask_legacy_irq,
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.irq_unmask = ks_dw_pcie_unmask_legacy_irq,
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};
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static int ks_dw_pcie_init_legacy_irq_map(struct irq_domain *d,
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unsigned int irq, irq_hw_number_t hw_irq)
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{
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irq_set_chip_and_handler(irq, &ks_dw_pcie_legacy_irq_chip,
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handle_level_irq);
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irq_set_chip_data(irq, d->host_data);
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set_irq_flags(irq, IRQF_VALID);
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return 0;
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}
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static const struct irq_domain_ops ks_dw_pcie_legacy_irq_domain_ops = {
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.map = ks_dw_pcie_init_legacy_irq_map,
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.xlate = irq_domain_xlate_onetwocell,
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};
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/**
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* ks_dw_pcie_set_dbi_mode() - Set DBI mode to access overlaid BAR mask
|
||||
* registers
|
||||
*
|
||||
* Since modification of dbi_cs2 involves different clock domain, read the
|
||||
* status back to ensure the transition is complete.
|
||||
*/
|
||||
static void ks_dw_pcie_set_dbi_mode(void __iomem *reg_virt)
|
||||
{
|
||||
u32 val;
|
||||
|
||||
writel(DBI_CS2_EN_VAL | readl(reg_virt + CMD_STATUS),
|
||||
reg_virt + CMD_STATUS);
|
||||
|
||||
do {
|
||||
val = readl(reg_virt + CMD_STATUS);
|
||||
} while (!(val & DBI_CS2_EN_VAL));
|
||||
}
|
||||
|
||||
/**
|
||||
* ks_dw_pcie_clear_dbi_mode() - Disable DBI mode
|
||||
*
|
||||
* Since modification of dbi_cs2 involves different clock domain, read the
|
||||
* status back to ensure the transition is complete.
|
||||
*/
|
||||
static void ks_dw_pcie_clear_dbi_mode(void __iomem *reg_virt)
|
||||
{
|
||||
u32 val;
|
||||
|
||||
writel(~DBI_CS2_EN_VAL & readl(reg_virt + CMD_STATUS),
|
||||
reg_virt + CMD_STATUS);
|
||||
|
||||
do {
|
||||
val = readl(reg_virt + CMD_STATUS);
|
||||
} while (val & DBI_CS2_EN_VAL);
|
||||
}
|
||||
|
||||
void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie)
|
||||
{
|
||||
struct pcie_port *pp = &ks_pcie->pp;
|
||||
u32 start = pp->mem.start, end = pp->mem.end;
|
||||
int i, tr_size;
|
||||
|
||||
/* Disable BARs for inbound access */
|
||||
ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
|
||||
writel(0, pp->dbi_base + PCI_BASE_ADDRESS_0);
|
||||
writel(0, pp->dbi_base + PCI_BASE_ADDRESS_1);
|
||||
ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
|
||||
|
||||
/* Set outbound translation size per window division */
|
||||
writel(CFG_PCIM_WIN_SZ_IDX & 0x7, ks_pcie->va_app_base + OB_SIZE);
|
||||
|
||||
tr_size = (1 << (CFG_PCIM_WIN_SZ_IDX & 0x7)) * SZ_1M;
|
||||
|
||||
/* Using Direct 1:1 mapping of RC <-> PCI memory space */
|
||||
for (i = 0; (i < CFG_PCIM_WIN_CNT) && (start < end); i++) {
|
||||
writel(start | 1, ks_pcie->va_app_base + OB_OFFSET_INDEX(i));
|
||||
writel(0, ks_pcie->va_app_base + OB_OFFSET_HI(i));
|
||||
start += tr_size;
|
||||
}
|
||||
|
||||
/* Enable OB translation */
|
||||
writel(OB_XLAT_EN_VAL | readl(ks_pcie->va_app_base + CMD_STATUS),
|
||||
ks_pcie->va_app_base + CMD_STATUS);
|
||||
}
|
||||
|
||||
/**
|
||||
* ks_pcie_cfg_setup() - Set up configuration space address for a device
|
||||
*
|
||||
* @ks_pcie: ptr to keystone_pcie structure
|
||||
* @bus: Bus number the device is residing on
|
||||
* @devfn: device, function number info
|
||||
*
|
||||
* Forms and returns the address of configuration space mapped in PCIESS
|
||||
* address space 0. Also configures CFG_SETUP for remote configuration space
|
||||
* access.
|
||||
*
|
||||
* The address space has two regions to access configuration - local and remote.
|
||||
* We access local region for bus 0 (as RC is attached on bus 0) and remote
|
||||
* region for others with TYPE 1 access when bus > 1. As for device on bus = 1,
|
||||
* we will do TYPE 0 access as it will be on our secondary bus (logical).
|
||||
* CFG_SETUP is needed only for remote configuration access.
|
||||
*/
|
||||
static void __iomem *ks_pcie_cfg_setup(struct keystone_pcie *ks_pcie, u8 bus,
|
||||
unsigned int devfn)
|
||||
{
|
||||
u8 device = PCI_SLOT(devfn), function = PCI_FUNC(devfn);
|
||||
struct pcie_port *pp = &ks_pcie->pp;
|
||||
u32 regval;
|
||||
|
||||
if (bus == 0)
|
||||
return pp->dbi_base;
|
||||
|
||||
regval = (bus << 16) | (device << 8) | function;
|
||||
|
||||
/*
|
||||
* Since Bus#1 will be a virtual bus, we need to have TYPE0
|
||||
* access only.
|
||||
* TYPE 1
|
||||
*/
|
||||
if (bus != 1)
|
||||
regval |= BIT(24);
|
||||
|
||||
writel(regval, ks_pcie->va_app_base + CFG_SETUP);
|
||||
return pp->va_cfg0_base;
|
||||
}
|
||||
|
||||
int ks_dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
|
||||
unsigned int devfn, int where, int size, u32 *val)
|
||||
{
|
||||
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
|
||||
u8 bus_num = bus->number;
|
||||
void __iomem *addr;
|
||||
|
||||
addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
|
||||
|
||||
return dw_pcie_cfg_read(addr + (where & ~0x3), where, size, val);
|
||||
}
|
||||
|
||||
int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
|
||||
unsigned int devfn, int where, int size, u32 val)
|
||||
{
|
||||
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
|
||||
u8 bus_num = bus->number;
|
||||
void __iomem *addr;
|
||||
|
||||
addr = ks_pcie_cfg_setup(ks_pcie, bus_num, devfn);
|
||||
|
||||
return dw_pcie_cfg_write(addr + (where & ~0x3), where, size, val);
|
||||
}
|
||||
|
||||
/**
|
||||
* ks_dw_pcie_v3_65_scan_bus() - keystone scan_bus post initialization
|
||||
*
|
||||
* This sets BAR0 to enable inbound access for MSI_IRQ register
|
||||
*/
|
||||
void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp)
|
||||
{
|
||||
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
|
||||
|
||||
/* Configure and set up BAR0 */
|
||||
ks_dw_pcie_set_dbi_mode(ks_pcie->va_app_base);
|
||||
|
||||
/* Enable BAR0 */
|
||||
writel(1, pp->dbi_base + PCI_BASE_ADDRESS_0);
|
||||
writel(SZ_4K - 1, pp->dbi_base + PCI_BASE_ADDRESS_0);
|
||||
|
||||
ks_dw_pcie_clear_dbi_mode(ks_pcie->va_app_base);
|
||||
|
||||
/*
|
||||
* For BAR0, just setting bus address for inbound writes (MSI) should
|
||||
* be sufficient. Use physical address to avoid any conflicts.
|
||||
*/
|
||||
writel(ks_pcie->app.start, pp->dbi_base + PCI_BASE_ADDRESS_0);
|
||||
}
|
||||
|
||||
/**
|
||||
* ks_dw_pcie_link_up() - Check if link up
|
||||
*/
|
||||
int ks_dw_pcie_link_up(struct pcie_port *pp)
|
||||
{
|
||||
u32 val = readl(pp->dbi_base + DEBUG0);
|
||||
|
||||
return (val & LTSSM_STATE_MASK) == LTSSM_STATE_L0;
|
||||
}
|
||||
|
||||
void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie)
|
||||
{
|
||||
u32 val;
|
||||
|
||||
/* Disable Link training */
|
||||
val = readl(ks_pcie->va_app_base + CMD_STATUS);
|
||||
val &= ~LTSSM_EN_VAL;
|
||||
writel(LTSSM_EN_VAL | val, ks_pcie->va_app_base + CMD_STATUS);
|
||||
|
||||
/* Initiate Link Training */
|
||||
val = readl(ks_pcie->va_app_base + CMD_STATUS);
|
||||
writel(LTSSM_EN_VAL | val, ks_pcie->va_app_base + CMD_STATUS);
|
||||
}
|
||||
|
||||
/**
|
||||
* ks_dw_pcie_host_init() - initialize host for v3_65 dw hardware
|
||||
*
|
||||
* Ioremap the register resources, initialize legacy irq domain
|
||||
* and call dw_pcie_v3_65_host_init() API to initialize the Keystone
|
||||
* PCI host controller.
|
||||
*/
|
||||
int __init ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
|
||||
struct device_node *msi_intc_np)
|
||||
{
|
||||
struct pcie_port *pp = &ks_pcie->pp;
|
||||
struct platform_device *pdev = to_platform_device(pp->dev);
|
||||
struct resource *res;
|
||||
|
||||
/* Index 0 is the config reg. space address */
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
pp->dbi_base = devm_ioremap_resource(pp->dev, res);
|
||||
if (IS_ERR(pp->dbi_base))
|
||||
return PTR_ERR(pp->dbi_base);
|
||||
|
||||
/*
|
||||
* We set these same and is used in pcie rd/wr_other_conf
|
||||
* functions
|
||||
*/
|
||||
pp->va_cfg0_base = pp->dbi_base + SPACE0_REMOTE_CFG_OFFSET;
|
||||
pp->va_cfg1_base = pp->va_cfg0_base;
|
||||
|
||||
/* Index 1 is the application reg. space address */
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
|
||||
ks_pcie->app = *res;
|
||||
ks_pcie->va_app_base = devm_ioremap_resource(pp->dev, res);
|
||||
if (IS_ERR(ks_pcie->va_app_base))
|
||||
return PTR_ERR(ks_pcie->va_app_base);
|
||||
|
||||
/* Create legacy IRQ domain */
|
||||
ks_pcie->legacy_irq_domain =
|
||||
irq_domain_add_linear(ks_pcie->legacy_intc_np,
|
||||
MAX_LEGACY_IRQS,
|
||||
&ks_dw_pcie_legacy_irq_domain_ops,
|
||||
NULL);
|
||||
if (!ks_pcie->legacy_irq_domain) {
|
||||
dev_err(pp->dev, "Failed to add irq domain for legacy irqs\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return dw_pcie_host_init(pp);
|
||||
}
|
||||
386
drivers/pci/host/pci-keystone.c
Normal file
386
drivers/pci/host/pci-keystone.c
Normal file
@ -0,0 +1,386 @@
|
||||
/*
|
||||
* PCIe host controller driver for Texas Instruments Keystone SoCs
|
||||
*
|
||||
* Copyright (C) 2013-2014 Texas Instruments., Ltd.
|
||||
* http://www.ti.com
|
||||
*
|
||||
* Author: Murali Karicheri <m-karicheri2@ti.com>
|
||||
* Implementation based on pci-exynos.c and pcie-designware.c
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/irqchip/chained_irq.h>
|
||||
#include <linux/clk.h>
|
||||
#include <linux/delay.h>
|
||||
#include <linux/irqdomain.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/msi.h>
|
||||
#include <linux/of_irq.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_pci.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/phy/phy.h>
|
||||
#include <linux/resource.h>
|
||||
#include <linux/signal.h>
|
||||
|
||||
#include "pcie-designware.h"
|
||||
#include "pci-keystone.h"
|
||||
|
||||
#define DRIVER_NAME "keystone-pcie"
|
||||
|
||||
/* driver specific constants */
|
||||
#define MAX_MSI_HOST_IRQS 8
|
||||
#define MAX_LEGACY_HOST_IRQS 4
|
||||
|
||||
/* RC mode settings masks */
|
||||
#define PCIE_RC_MODE BIT(2)
|
||||
#define PCIE_MODE_MASK (BIT(1) | BIT(2))
|
||||
|
||||
/* DEV_STAT_CTRL */
|
||||
#define PCIE_CAP_BASE 0x70
|
||||
|
||||
#define to_keystone_pcie(x) container_of(x, struct keystone_pcie, pp)
|
||||
|
||||
static int ks_pcie_establish_link(struct keystone_pcie *ks_pcie)
|
||||
{
|
||||
struct pcie_port *pp = &ks_pcie->pp;
|
||||
int count = 200;
|
||||
|
||||
dw_pcie_setup_rc(pp);
|
||||
|
||||
if (dw_pcie_link_up(pp)) {
|
||||
dev_err(pp->dev, "Link already up\n");
|
||||
return 0;
|
||||
}
|
||||
|
||||
ks_dw_pcie_initiate_link_train(ks_pcie);
|
||||
/* check if the link is up or not */
|
||||
while (!dw_pcie_link_up(pp)) {
|
||||
usleep_range(100, 1000);
|
||||
if (--count) {
|
||||
ks_dw_pcie_initiate_link_train(ks_pcie);
|
||||
continue;
|
||||
}
|
||||
dev_err(pp->dev, "phy link never came up\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void ks_pcie_msi_irq_handler(unsigned int irq, struct irq_desc *desc)
|
||||
{
|
||||
struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
|
||||
u32 offset = irq - ks_pcie->msi_host_irqs[0];
|
||||
struct pcie_port *pp = &ks_pcie->pp;
|
||||
struct irq_chip *chip = irq_desc_get_chip(desc);
|
||||
|
||||
dev_dbg(pp->dev, "ks_pci_msi_irq_handler, irq %d\n", irq);
|
||||
|
||||
/*
|
||||
* The chained irq handler installation would have replaced normal
|
||||
* interrupt driver handler so we need to take care of mask/unmask and
|
||||
* ack operation.
|
||||
*/
|
||||
chained_irq_enter(chip, desc);
|
||||
ks_dw_pcie_handle_msi_irq(ks_pcie, offset);
|
||||
chained_irq_exit(chip, desc);
|
||||
}
|
||||
|
||||
/**
|
||||
* ks_pcie_legacy_irq_handler() - Handle legacy interrupt
|
||||
* @irq: IRQ line for legacy interrupts
|
||||
* @desc: Pointer to irq descriptor
|
||||
*
|
||||
* Traverse through pending legacy interrupts and invoke handler for each. Also
|
||||
* takes care of interrupt controller level mask/ack operation.
|
||||
*/
|
||||
static void ks_pcie_legacy_irq_handler(unsigned int irq, struct irq_desc *desc)
|
||||
{
|
||||
struct keystone_pcie *ks_pcie = irq_desc_get_handler_data(desc);
|
||||
struct pcie_port *pp = &ks_pcie->pp;
|
||||
u32 irq_offset = irq - ks_pcie->legacy_host_irqs[0];
|
||||
struct irq_chip *chip = irq_desc_get_chip(desc);
|
||||
|
||||
dev_dbg(pp->dev, ": Handling legacy irq %d\n", irq);
|
||||
|
||||
/*
|
||||
* The chained irq handler installation would have replaced normal
|
||||
* interrupt driver handler so we need to take care of mask/unmask and
|
||||
* ack operation.
|
||||
*/
|
||||
chained_irq_enter(chip, desc);
|
||||
ks_dw_pcie_handle_legacy_irq(ks_pcie, irq_offset);
|
||||
chained_irq_exit(chip, desc);
|
||||
}
|
||||
|
||||
static int ks_pcie_get_irq_controller_info(struct keystone_pcie *ks_pcie,
|
||||
char *controller, int *num_irqs)
|
||||
{
|
||||
int temp, max_host_irqs, legacy = 1, *host_irqs, ret = -EINVAL;
|
||||
struct device *dev = ks_pcie->pp.dev;
|
||||
struct device_node *np_pcie = dev->of_node, **np_temp;
|
||||
|
||||
if (!strcmp(controller, "msi-interrupt-controller"))
|
||||
legacy = 0;
|
||||
|
||||
if (legacy) {
|
||||
np_temp = &ks_pcie->legacy_intc_np;
|
||||
max_host_irqs = MAX_LEGACY_HOST_IRQS;
|
||||
host_irqs = &ks_pcie->legacy_host_irqs[0];
|
||||
} else {
|
||||
np_temp = &ks_pcie->msi_intc_np;
|
||||
max_host_irqs = MAX_MSI_HOST_IRQS;
|
||||
host_irqs = &ks_pcie->msi_host_irqs[0];
|
||||
}
|
||||
|
||||
/* interrupt controller is in a child node */
|
||||
*np_temp = of_find_node_by_name(np_pcie, controller);
|
||||
if (!(*np_temp)) {
|
||||
dev_err(dev, "Node for %s is absent\n", controller);
|
||||
goto out;
|
||||
}
|
||||
temp = of_irq_count(*np_temp);
|
||||
if (!temp)
|
||||
goto out;
|
||||
if (temp > max_host_irqs)
|
||||
dev_warn(dev, "Too many %s interrupts defined %u\n",
|
||||
(legacy ? "legacy" : "MSI"), temp);
|
||||
|
||||
/*
|
||||
* support upto max_host_irqs. In dt from index 0 to 3 (legacy) or 0 to
|
||||
* 7 (MSI)
|
||||
*/
|
||||
for (temp = 0; temp < max_host_irqs; temp++) {
|
||||
host_irqs[temp] = irq_of_parse_and_map(*np_temp, temp);
|
||||
if (host_irqs[temp] < 0)
|
||||
break;
|
||||
}
|
||||
if (temp) {
|
||||
*num_irqs = temp;
|
||||
ret = 0;
|
||||
}
|
||||
out:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie)
|
||||
{
|
||||
int i;
|
||||
|
||||
/* Legacy IRQ */
|
||||
for (i = 0; i < ks_pcie->num_legacy_host_irqs; i++) {
|
||||
irq_set_handler_data(ks_pcie->legacy_host_irqs[i], ks_pcie);
|
||||
irq_set_chained_handler(ks_pcie->legacy_host_irqs[i],
|
||||
ks_pcie_legacy_irq_handler);
|
||||
}
|
||||
ks_dw_pcie_enable_legacy_irqs(ks_pcie);
|
||||
|
||||
/* MSI IRQ */
|
||||
if (IS_ENABLED(CONFIG_PCI_MSI)) {
|
||||
for (i = 0; i < ks_pcie->num_msi_host_irqs; i++) {
|
||||
irq_set_chained_handler(ks_pcie->msi_host_irqs[i],
|
||||
ks_pcie_msi_irq_handler);
|
||||
irq_set_handler_data(ks_pcie->msi_host_irqs[i],
|
||||
ks_pcie);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* When a PCI device does not exist during config cycles, keystone host gets a
|
||||
* bus error instead of returning 0xffffffff. This handler always returns 0
|
||||
* for this kind of faults.
|
||||
*/
|
||||
static int keystone_pcie_fault(unsigned long addr, unsigned int fsr,
|
||||
struct pt_regs *regs)
|
||||
{
|
||||
unsigned long instr = *(unsigned long *) instruction_pointer(regs);
|
||||
|
||||
if ((instr & 0x0e100090) == 0x00100090) {
|
||||
int reg = (instr >> 12) & 15;
|
||||
|
||||
regs->uregs[reg] = -1;
|
||||
regs->ARM_pc += 4;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __init ks_pcie_host_init(struct pcie_port *pp)
|
||||
{
|
||||
u32 vendor_device_id, val;
|
||||
struct keystone_pcie *ks_pcie = to_keystone_pcie(pp);
|
||||
|
||||
ks_pcie_establish_link(ks_pcie);
|
||||
ks_dw_pcie_setup_rc_app_regs(ks_pcie);
|
||||
ks_pcie_setup_interrupts(ks_pcie);
|
||||
writew(PCI_IO_RANGE_TYPE_32 | (PCI_IO_RANGE_TYPE_32 << 8),
|
||||
pp->dbi_base + PCI_IO_BASE);
|
||||
|
||||
/* update the Vendor ID */
|
||||
vendor_device_id = readl(ks_pcie->va_reg_pciid);
|
||||
writew((vendor_device_id >> 16), pp->dbi_base + PCI_DEVICE_ID);
|
||||
|
||||
/* update the DEV_STAT_CTRL to publish right mrrs */
|
||||
val = readl(pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
|
||||
val &= ~PCI_EXP_DEVCTL_READRQ;
|
||||
/* set the mrrs to 256 bytes */
|
||||
val |= BIT(12);
|
||||
writel(val, pp->dbi_base + PCIE_CAP_BASE + PCI_EXP_DEVCTL);
|
||||
|
||||
/*
|
||||
* PCIe access errors that result into OCP errors are caught by ARM as
|
||||
* "External aborts"
|
||||
*/
|
||||
hook_fault_code(17, keystone_pcie_fault, SIGBUS, 0,
|
||||
"Asynchronous external abort");
|
||||
}
|
||||
|
||||
static struct pcie_host_ops keystone_pcie_host_ops = {
|
||||
.rd_other_conf = ks_dw_pcie_rd_other_conf,
|
||||
.wr_other_conf = ks_dw_pcie_wr_other_conf,
|
||||
.link_up = ks_dw_pcie_link_up,
|
||||
.host_init = ks_pcie_host_init,
|
||||
.msi_set_irq = ks_dw_pcie_msi_set_irq,
|
||||
.msi_clear_irq = ks_dw_pcie_msi_clear_irq,
|
||||
.get_msi_data = ks_dw_pcie_get_msi_data,
|
||||
.msi_host_init = ks_dw_pcie_msi_host_init,
|
||||
.scan_bus = ks_dw_pcie_v3_65_scan_bus,
|
||||
};
|
||||
|
||||
static int __init ks_add_pcie_port(struct keystone_pcie *ks_pcie,
|
||||
struct platform_device *pdev)
|
||||
{
|
||||
struct pcie_port *pp = &ks_pcie->pp;
|
||||
int ret;
|
||||
|
||||
ret = ks_pcie_get_irq_controller_info(ks_pcie,
|
||||
"legacy-interrupt-controller",
|
||||
&ks_pcie->num_legacy_host_irqs);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
if (IS_ENABLED(CONFIG_PCI_MSI)) {
|
||||
ret = ks_pcie_get_irq_controller_info(ks_pcie,
|
||||
"msi-interrupt-controller",
|
||||
&ks_pcie->num_msi_host_irqs);
|
||||
if (ret)
|
||||
return ret;
|
||||
}
|
||||
|
||||
pp->root_bus_nr = -1;
|
||||
pp->ops = &keystone_pcie_host_ops;
|
||||
ret = ks_dw_pcie_host_init(ks_pcie, ks_pcie->msi_intc_np);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "failed to initialize host\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static const struct of_device_id ks_pcie_of_match[] = {
|
||||
{
|
||||
.type = "pci",
|
||||
.compatible = "ti,keystone-pcie",
|
||||
},
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, ks_pcie_of_match);
|
||||
|
||||
static int __exit ks_pcie_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct keystone_pcie *ks_pcie = platform_get_drvdata(pdev);
|
||||
|
||||
clk_disable_unprepare(ks_pcie->clk);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __init ks_pcie_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
struct keystone_pcie *ks_pcie;
|
||||
struct pcie_port *pp;
|
||||
struct resource *res;
|
||||
void __iomem *reg_p;
|
||||
struct phy *phy;
|
||||
int ret = 0;
|
||||
u32 val;
|
||||
|
||||
ks_pcie = devm_kzalloc(&pdev->dev, sizeof(*ks_pcie),
|
||||
GFP_KERNEL);
|
||||
if (!ks_pcie) {
|
||||
dev_err(dev, "no memory for keystone pcie\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
pp = &ks_pcie->pp;
|
||||
|
||||
/* index 2 is the devcfg register for RC mode settings */
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
|
||||
reg_p = devm_ioremap_resource(dev, res);
|
||||
if (IS_ERR(reg_p))
|
||||
return PTR_ERR(reg_p);
|
||||
|
||||
/* enable RC mode in devcfg */
|
||||
val = readl(reg_p);
|
||||
val &= ~PCIE_MODE_MASK;
|
||||
val |= PCIE_RC_MODE;
|
||||
writel(val, reg_p);
|
||||
|
||||
/* initialize SerDes Phy if present */
|
||||
phy = devm_phy_get(dev, "pcie-phy");
|
||||
if (!IS_ERR_OR_NULL(phy)) {
|
||||
ret = phy_init(phy);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* index 3 is to read PCI DEVICE_ID */
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 3);
|
||||
reg_p = devm_ioremap_resource(dev, res);
|
||||
if (IS_ERR(reg_p))
|
||||
return PTR_ERR(reg_p);
|
||||
ks_pcie->va_reg_pciid = reg_p;
|
||||
|
||||
pp->dev = dev;
|
||||
platform_set_drvdata(pdev, ks_pcie);
|
||||
ks_pcie->clk = devm_clk_get(dev, "pcie");
|
||||
if (IS_ERR(ks_pcie->clk)) {
|
||||
dev_err(dev, "Failed to get pcie rc clock\n");
|
||||
return PTR_ERR(ks_pcie->clk);
|
||||
}
|
||||
ret = clk_prepare_enable(ks_pcie->clk);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
ret = ks_add_pcie_port(ks_pcie, pdev);
|
||||
if (ret < 0)
|
||||
goto fail_clk;
|
||||
|
||||
return 0;
|
||||
fail_clk:
|
||||
clk_disable_unprepare(ks_pcie->clk);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct platform_driver ks_pcie_driver __refdata = {
|
||||
.probe = ks_pcie_probe,
|
||||
.remove = __exit_p(ks_pcie_remove),
|
||||
.driver = {
|
||||
.name = "keystone-pcie",
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = of_match_ptr(ks_pcie_of_match),
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(ks_pcie_driver);
|
||||
|
||||
MODULE_AUTHOR("Murali Karicheri <m-karicheri2@ti.com>");
|
||||
MODULE_DESCRIPTION("Keystone PCIe host controller driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
58
drivers/pci/host/pci-keystone.h
Normal file
58
drivers/pci/host/pci-keystone.h
Normal file
@ -0,0 +1,58 @@
|
||||
/*
|
||||
* Keystone PCI Controller's common includes
|
||||
*
|
||||
* Copyright (C) 2013-2014 Texas Instruments., Ltd.
|
||||
* http://www.ti.com
|
||||
*
|
||||
* Author: Murali Karicheri <m-karicheri2@ti.com>
|
||||
*
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#define MAX_LEGACY_IRQS 4
|
||||
#define MAX_MSI_HOST_IRQS 8
|
||||
#define MAX_LEGACY_HOST_IRQS 4
|
||||
|
||||
struct keystone_pcie {
|
||||
struct clk *clk;
|
||||
struct pcie_port pp;
|
||||
void __iomem *va_reg_pciid;
|
||||
|
||||
int num_legacy_host_irqs;
|
||||
int legacy_host_irqs[MAX_LEGACY_HOST_IRQS];
|
||||
struct device_node *legacy_intc_np;
|
||||
|
||||
int num_msi_host_irqs;
|
||||
int msi_host_irqs[MAX_MSI_HOST_IRQS];
|
||||
struct device_node *msi_intc_np;
|
||||
struct irq_domain *legacy_irq_domain;
|
||||
|
||||
/* Application register space */
|
||||
void __iomem *va_app_base;
|
||||
struct resource app;
|
||||
};
|
||||
|
||||
/* Keystone DW specific MSI controller APIs/definitions */
|
||||
void ks_dw_pcie_handle_msi_irq(struct keystone_pcie *ks_pcie, int offset);
|
||||
u32 ks_dw_pcie_get_msi_data(struct pcie_port *pp);
|
||||
|
||||
/* Keystone specific PCI controller APIs */
|
||||
void ks_dw_pcie_enable_legacy_irqs(struct keystone_pcie *ks_pcie);
|
||||
void ks_dw_pcie_handle_legacy_irq(struct keystone_pcie *ks_pcie, int offset);
|
||||
int ks_dw_pcie_host_init(struct keystone_pcie *ks_pcie,
|
||||
struct device_node *msi_intc_np);
|
||||
int ks_dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus,
|
||||
unsigned int devfn, int where, int size, u32 val);
|
||||
int ks_dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus,
|
||||
unsigned int devfn, int where, int size, u32 *val);
|
||||
void ks_dw_pcie_setup_rc_app_regs(struct keystone_pcie *ks_pcie);
|
||||
int ks_dw_pcie_link_up(struct pcie_port *pp);
|
||||
void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie);
|
||||
void ks_dw_pcie_msi_set_irq(struct pcie_port *pp, int irq);
|
||||
void ks_dw_pcie_msi_clear_irq(struct pcie_port *pp, int irq);
|
||||
void ks_dw_pcie_v3_65_scan_bus(struct pcie_port *pp);
|
||||
int ks_dw_pcie_msi_host_init(struct pcie_port *pp,
|
||||
struct msi_chip *chip);
|
||||
Loading…
Reference in New Issue
Block a user