diff options
| -rw-r--r-- | Documentation/devicetree/bindings/bus/renesas,bsc.txt | 46 | ||||
| -rw-r--r-- | Documentation/devicetree/bindings/bus/simple-pm-bus.txt | 44 | ||||
| -rw-r--r-- | drivers/bus/Kconfig | 53 | ||||
| -rw-r--r-- | drivers/bus/Makefile | 15 | ||||
| -rw-r--r-- | drivers/bus/simple-pm-bus.c | 58 |
5 files changed, 189 insertions, 27 deletions
diff --git a/Documentation/devicetree/bindings/bus/renesas,bsc.txt b/Documentation/devicetree/bindings/bus/renesas,bsc.txt new file mode 100644 index 000000000000..90e947269437 --- /dev/null +++ b/Documentation/devicetree/bindings/bus/renesas,bsc.txt @@ -0,0 +1,46 @@ +Renesas Bus State Controller (BSC) +================================== + +The Renesas Bus State Controller (BSC, sometimes called "LBSC within Bus +Bridge", or "External Bus Interface") can be found in several Renesas ARM SoCs. +It provides an external bus for connecting multiple external devices to the +SoC, driving several chip select lines, for e.g. NOR FLASH, Ethernet and USB. + +While the BSC is a fairly simple memory-mapped bus, it may be part of a PM +domain, and may have a gateable functional clock. +Before a device connected to the BSC can be accessed, the PM domain +containing the BSC must be powered on, and the functional clock +driving the BSC must be enabled. + +The bindings for the BSC extend the bindings for "simple-pm-bus". + + +Required properties + - compatible: Must contain an SoC-specific value, and "renesas,bsc" and + "simple-pm-bus" as fallbacks. + SoC-specific values can be: + "renesas,bsc-r8a73a4" for R-Mobile APE6 (r8a73a4) + "renesas,bsc-sh73a0" for SH-Mobile AG5 (sh73a0) + - #address-cells, #size-cells, ranges: Must describe the mapping between + parent address and child address spaces. + - reg: Must contain the base address and length to access the bus controller. + +Optional properties: + - interrupts: Must contain a reference to the BSC interrupt, if available. + - clocks: Must contain a reference to the functional clock, if available. + - power-domains: Must contain a reference to the PM domain, if available. + + +Example: + + bsc: bus@fec10000 { + compatible = "renesas,bsc-sh73a0", "renesas,bsc", + "simple-pm-bus"; + #address-cells = <1>; + #size-cells = <1>; + ranges = <0 0 0x20000000>; + reg = <0xfec10000 0x400>; + interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&zb_clk>; + power-domains = <&pd_a4s>; + }; diff --git a/Documentation/devicetree/bindings/bus/simple-pm-bus.txt b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt new file mode 100644 index 000000000000..d032237512c2 --- /dev/null +++ b/Documentation/devicetree/bindings/bus/simple-pm-bus.txt @@ -0,0 +1,44 @@ +Simple Power-Managed Bus +======================== + +A Simple Power-Managed Bus is a transparent bus that doesn't need a real +driver, as it's typically initialized by the boot loader. + +However, its bus controller is part of a PM domain, or under the control of a +functional clock. Hence, the bus controller's PM domain and/or clock must be +enabled for child devices connected to the bus (either on-SoC or externally) +to function. + +While "simple-pm-bus" follows the "simple-bus" set of properties, as specified +in ePAPR, it is not an extension of "simple-bus". + + +Required properties: + - compatible: Must contain at least "simple-pm-bus". + Must not contain "simple-bus". + It's recommended to let this be preceded by one or more + vendor-specific compatible values. + - #address-cells, #size-cells, ranges: Must describe the mapping between + parent address and child address spaces. + +Optional platform-specific properties for clock or PM domain control (at least +one of them is required): + - clocks: Must contain a reference to the functional clock(s), + - power-domains: Must contain a reference to the PM domain. +Please refer to the binding documentation for the clock and/or PM domain +providers for more details. + + +Example: + + bsc: bus@fec10000 { + compatible = "renesas,bsc-sh73a0", "renesas,bsc", + "simple-pm-bus"; + #address-cells = <1>; + #size-cells = <1>; + ranges = <0 0 0x20000000>; + reg = <0xfec10000 0x400>; + interrupts = <0 39 IRQ_TYPE_LEVEL_HIGH>; + clocks = <&zb_clk>; + power-domains = <&pd_a4s>; + }; diff --git a/drivers/bus/Kconfig b/drivers/bus/Kconfig index b99729e36860..7e9c2674af81 100644 --- a/drivers/bus/Kconfig +++ b/drivers/bus/Kconfig @@ -4,6 +4,21 @@ menu "Bus devices" +config ARM_CCI + bool "ARM CCI driver support" + depends on ARM && OF && CPU_V7 + help + Driver supporting the CCI cache coherent interconnect for ARM + platforms. + +config ARM_CCN + bool "ARM CCN driver support" + depends on ARM || ARM64 + depends on PERF_EVENTS + help + PMU (perf) driver supporting the ARM CCN (Cache Coherent Network) + interconnect. + config BRCMSTB_GISB_ARB bool "Broadcom STB GISB bus arbiter" depends on ARM || MIPS @@ -27,15 +42,6 @@ config MVEBU_MBUS Driver needed for the MBus configuration on Marvell EBU SoCs (Kirkwood, Dove, Orion5x, MV78XX0 and Armada 370/XP). -config OMAP_OCP2SCP - tristate "OMAP OCP2SCP DRIVER" - depends on ARCH_OMAP2PLUS - help - Driver to enable ocp2scp module which transforms ocp interface - protocol to scp protocol. In OMAP4, USB PHY is connected via - OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via - OCP2SCP. - config OMAP_INTERCONNECT tristate "OMAP INTERCONNECT DRIVER" depends on ARCH_OMAP2PLUS @@ -43,20 +49,27 @@ config OMAP_INTERCONNECT help Driver to enable OMAP interconnect error handling driver. -config ARM_CCI - bool "ARM CCI driver support" - depends on ARM && OF && CPU_V7 +config OMAP_OCP2SCP + tristate "OMAP OCP2SCP DRIVER" + depends on ARCH_OMAP2PLUS help - Driver supporting the CCI cache coherent interconnect for ARM - platforms. + Driver to enable ocp2scp module which transforms ocp interface + protocol to scp protocol. In OMAP4, USB PHY is connected via + OCP2SCP and in OMAP5, both USB PHY and SATA PHY is connected via + OCP2SCP. -config ARM_CCN - bool "ARM CCN driver support" - depends on ARM || ARM64 - depends on PERF_EVENTS +config SIMPLE_PM_BUS + bool "Simple Power-Managed Bus Driver" + depends on OF && PM + depends on ARCH_SHMOBILE || COMPILE_TEST help - PMU (perf) driver supporting the ARM CCN (Cache Coherent Network) - interconnect. + Driver for transparent busses that don't need a real driver, but + where the bus controller is part of a PM domain, or under the control + of a functional clock, and thus relies on runtime PM for managing + this PM domain and/or clock. + An example of such a bus controller is the Renesas Bus State + Controller (BSC, sometimes called "LBSC within Bus Bridge", or + "External Bus Interface") as found on several Renesas ARM SoCs. config VEXPRESS_CONFIG bool "Versatile Express configuration bus" diff --git a/drivers/bus/Makefile b/drivers/bus/Makefile index 2973c18cbcc2..e023a2bec664 100644 --- a/drivers/bus/Makefile +++ b/drivers/bus/Makefile @@ -2,16 +2,17 @@ # Makefile for the bus drivers. # +# Interconnect bus drivers for ARM platforms +obj-$(CONFIG_ARM_CCI) += arm-cci.o +obj-$(CONFIG_ARM_CCN) += arm-ccn.o + obj-$(CONFIG_BRCMSTB_GISB_ARB) += brcmstb_gisb.o -obj-$(CONFIG_IMX_WEIM) += imx-weim.o -obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o -obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o +obj-$(CONFIG_IMX_WEIM) += imx-weim.o +obj-$(CONFIG_MVEBU_MBUS) += mvebu-mbus.o # Interconnect bus driver for OMAP SoCs. obj-$(CONFIG_OMAP_INTERCONNECT) += omap_l3_smx.o omap_l3_noc.o -# Interconnect bus drivers for ARM platforms -obj-$(CONFIG_ARM_CCI) += arm-cci.o -obj-$(CONFIG_ARM_CCN) += arm-ccn.o - +obj-$(CONFIG_OMAP_OCP2SCP) += omap-ocp2scp.o +obj-$(CONFIG_SIMPLE_PM_BUS) += simple-pm-bus.o obj-$(CONFIG_VEXPRESS_CONFIG) += vexpress-config.o diff --git a/drivers/bus/simple-pm-bus.c b/drivers/bus/simple-pm-bus.c new file mode 100644 index 000000000000..c5eb46cbf388 --- /dev/null +++ b/drivers/bus/simple-pm-bus.c @@ -0,0 +1,58 @@ +/* + * Simple Power-Managed Bus Driver + * + * Copyright (C) 2014-2015 Glider bvba + * + * This file is subject to the terms and conditions of the GNU General Public + * License. See the file "COPYING" in the main directory of this archive + * for more details. + */ + +#include <linux/module.h> +#include <linux/of_platform.h> +#include <linux/platform_device.h> +#include <linux/pm_runtime.h> + + +static int simple_pm_bus_probe(struct platform_device *pdev) +{ + struct device_node *np = pdev->dev.of_node; + + dev_dbg(&pdev->dev, "%s\n", __func__); + + pm_runtime_enable(&pdev->dev); + + if (np) + of_platform_populate(np, NULL, NULL, &pdev->dev); + + return 0; +} + +static int simple_pm_bus_remove(struct platform_device *pdev) +{ + dev_dbg(&pdev->dev, "%s\n", __func__); + + pm_runtime_disable(&pdev->dev); + return 0; +} + +static const struct of_device_id simple_pm_bus_of_match[] = { + { .compatible = "simple-pm-bus", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, simple_pm_bus_of_match); + +static struct platform_driver simple_pm_bus_driver = { + .probe = simple_pm_bus_probe, + .remove = simple_pm_bus_remove, + .driver = { + .name = "simple-pm-bus", + .of_match_table = simple_pm_bus_of_match, + }, +}; + +module_platform_driver(simple_pm_bus_driver); + +MODULE_DESCRIPTION("Simple Power-Managed Bus Driver"); +MODULE_AUTHOR("Geert Uytterhoeven <[email protected]>"); +MODULE_LICENSE("GPL v2"); |