This patch adds a driver for the bus associated with a IHS FPGA.
Signed-off-by: Mario Six mario.six@gdsys.cc ---
v2 -> v3: * Fixed style violations * Added bindings file * Added more debug output in case of errors * Switched all printfs to debug * Documented the private data structure * Formatted documentation as proper kernel-doc * Expanded Kconfig description
v1 -> v2: * Switched to correct uclass for IHS FPGA driver (now in MISC uclass)
--- .../devicetree/bindings/misc/gdsys,soc.txt | 16 +++++ drivers/misc/Kconfig | 9 +++ drivers/misc/Makefile | 1 + drivers/misc/gdsys_soc.c | 74 ++++++++++++++++++++++ drivers/misc/gdsys_soc.h | 23 +++++++ 5 files changed, 123 insertions(+) create mode 100644 Documentation/devicetree/bindings/misc/gdsys,soc.txt create mode 100644 drivers/misc/gdsys_soc.c create mode 100644 drivers/misc/gdsys_soc.h
diff --git a/Documentation/devicetree/bindings/misc/gdsys,soc.txt b/Documentation/devicetree/bindings/misc/gdsys,soc.txt new file mode 100644 index 00000000000..278e935b166 --- /dev/null +++ b/Documentation/devicetree/bindings/misc/gdsys,soc.txt @@ -0,0 +1,16 @@ +gdsys soc bus driver + +This driver provides a simple interface for the busses associated with gdsys +IHS FPGAs. The bus itself contains devices whose register maps are contained +within the FPGA's register space. + +Required properties: +- fpga: A phandle to the controlling IHS FPGA + +Example: + +FPGA0BUS: fpga0bus { + compatible = "gdsys,soc"; + ranges = <0x0 0xe0600000 0x00004000>; + fpga = <&FPGA0>; +}; diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 89854a4941b..535be1491e3 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -289,4 +289,13 @@ config GDSYS_IOEP depends on MISC help Support gdsys FPGA's IO endpoint driver. + +config GDSYS_SOC + bool "Enable gdsys SOC driver" + depends on MISC + help + Support for gdsys IHS SOC, a simple bus associated with each gdsys + IHS (Integrated Hardware Systems) FPGA, which holds all devices whose + register maps are contained within the FPGA's register map. + endmenu diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index 3ab110a1aaa..b1f9ce7ed39 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -37,6 +37,7 @@ obj-$(CONFIG_FSL_MC9SDZ60) += mc9sdz60.o obj-$(CONFIG_FSL_SEC_MON) += fsl_sec_mon.o obj-$(CONFIG_GDSYS_IOEP) += gdsys_ioep.o obj-$(CONFIG_GDSYS_RXAUI_CTRL) += gdsys_rxaui_ctrl.o +obj-$(CONFIG_GDSYS_SOC) += gdsys_soc.o obj-$(CONFIG_$(SPL_)I2C_EEPROM) += i2c_eeprom.o obj-$(CONFIG_LED_STATUS) += status_led.o obj-$(CONFIG_LED_STATUS_GPIO) += gpio_led.o diff --git a/drivers/misc/gdsys_soc.c b/drivers/misc/gdsys_soc.c new file mode 100644 index 00000000000..94a21e08af7 --- /dev/null +++ b/drivers/misc/gdsys_soc.c @@ -0,0 +1,74 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * (C) Copyright 2017 + * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc + */ + +#include <common.h> +#include <dm.h> +#include <dm/lists.h> + +#include "gdsys_soc.h" + +/** + * struct gdsys_soc_priv - Private data for gdsys soc bus + * @fpga: The gdsys IHS FPGA this bus is associated with + */ +struct gdsys_soc_priv { + struct udevice *fpga; +}; + +static const struct udevice_id gdsys_soc_ids[] = { + { .compatible = "gdsys,soc" }, + { /* sentinel */ } +}; + +int gdsys_soc_get_fpga(struct udevice *child, struct udevice **fpga) +{ + struct gdsys_soc_priv *bus_priv; + + if (!child->parent) { + debug("%s: Invalid parent\n", child->name); + return -EINVAL; + } + + if (!device_is_compatible(child->parent, "gdsys,soc")) { + debug("%s: Not child of a gdsys soc\n", child->name); + return -EINVAL; + } + + bus_priv = dev_get_priv(child->parent); + + *fpga = bus_priv->fpga; + + return 0; +} + +static int gdsys_soc_probe(struct udevice *dev) +{ + struct gdsys_soc_priv *priv = dev_get_priv(dev); + struct udevice *fpga; + int res = uclass_get_device_by_phandle(UCLASS_MISC, dev, "fpga", + &fpga); + if (res == -ENOENT) { + debug("%s: Could not find 'fpga' phandle\n", dev->name); + return -EINVAL; + } + + if (res == -ENODEV) { + debug("%s: Could not get FPGA device\n", dev->name); + return -EINVAL; + } + + priv->fpga = fpga; + + return 0; +} + +U_BOOT_DRIVER(gdsys_soc_bus) = { + .name = "gdsys_soc_bus", + .id = UCLASS_SIMPLE_BUS, + .of_match = gdsys_soc_ids, + .probe = gdsys_soc_probe, + .priv_auto_alloc_size = sizeof(struct gdsys_soc_priv), +}; diff --git a/drivers/misc/gdsys_soc.h b/drivers/misc/gdsys_soc.h new file mode 100644 index 00000000000..088d3b65234 --- /dev/null +++ b/drivers/misc/gdsys_soc.h @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* + * (C) Copyright 2017 + * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc + */ + +#ifndef _GDSYS_SOC_H_ +#define _GDSYS_SOC_H_ + +/** + * gdsys_soc_get_fpga() - Retrieve pointer to parent bus' FPGA device + * @child: The child device on the FPGA bus needing access to the FPGA. + * @fpga: Pointer to the retrieved FPGA device. + * + * To access their register maps, devices on gdsys soc buses usually have + * facilitate the accessor function of the IHS FPGA their parent bus is + * attached to. To access the FPGA device from within the bus' children, this + * function returns a pointer to it. + * + * Return: 0 on success, -ve on failure + */ +int gdsys_soc_get_fpga(struct udevice *child, struct udevice **fpga); +#endif /* _GDSYS_SOC_H_ */ -- 2.11.0