This patch adds a driver for the bus associated with a IHS FPGA.
Signed-off-by: Mario Six mario.six@gdsys.cc ---
v1 -> v2: * Switched to correct uclass for IHS FPGA driver (now in MISC uclass)
--- drivers/misc/Kconfig | 6 ++++- drivers/misc/Makefile | 1 + drivers/misc/gdsys_soc.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++ drivers/misc/gdsys_soc.h | 24 +++++++++++++++++ 4 files changed, 97 insertions(+), 1 deletion(-) create mode 100644 drivers/misc/gdsys_soc.c create mode 100644 drivers/misc/gdsys_soc.h
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index d774569cbc..9d58d96321 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -263,5 +263,9 @@ config SYS_I2C_EEPROM_ADDR_OVERFLOW
endif
- +config GDSYS_SOC + bool "Enable gdsys SOC driver" + depends on MISC + help + Support for IHS SOC. endmenu diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index e8d598cd47..d35f7d856d 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -54,3 +54,4 @@ obj-$(CONFIG_QFW) += qfw.o obj-$(CONFIG_ROCKCHIP_EFUSE) += rockchip-efuse.o obj-$(CONFIG_STM32_RCC) += stm32_rcc.o obj-$(CONFIG_SYS_DPAA_QBMAN) += fsl_portals.o +obj-$(CONFIG_GDSYS_SOC) += gdsys_soc.o diff --git a/drivers/misc/gdsys_soc.c b/drivers/misc/gdsys_soc.c new file mode 100644 index 0000000000..0bf1dd8303 --- /dev/null +++ b/drivers/misc/gdsys_soc.c @@ -0,0 +1,67 @@ +/* + * (C) Copyright 2017 + * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <dm.h> +#include <dm/lists.h> + +#include "gdsys_soc.h" + +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) + return -EINVAL; + + if (!device_is_compatible(child->parent, "gdsys,soc")) + 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) { + printf("%s: Could not find 'fpga' phandle.\n", dev->name); + return -EINVAL; + } + + if (res == -ENODEV) { + printf("%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 0000000000..0f88149fd6 --- /dev/null +++ b/drivers/misc/gdsys_soc.h @@ -0,0 +1,24 @@ +/* + * (C) Copyright 2017 + * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _GDSYS_SOC_H_ +#define _GDSYS_SOC_H_ + +/** + * gdsys_soc_get_fpga() - Retrieve pointer to parent bus' 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. + * + * @child: The child device on the FPGA bus needing access to the FPGA. + * @fpga: Pointer to the retrieved FPGA device. + * @return 0 on success, -ve on failure + */ +int gdsys_soc_get_fpga(struct udevice *child, struct udevice **fpga); +#endif /* _GDSYS_SOC_H_ */