From 7606c377f56ab68421aa482b1ded6840d426e197 Mon Sep 17 00:00:00 2001 From: Furquan Shaikh Date: Sat, 11 Feb 2017 10:57:23 -0800 Subject: device: Add a new "SPI" device type Add support for a new "SPI" device type in the devicetree to bind a device on the SPI bus. Allow device to provide chip select number for the device as a parameter. Add spi_bus_operations with operation dev_to_bus which allows SoCs to define a translation method for converting "struct device" into a unique SPI bus number. BUG=chrome-os-partner:59832 BRANCH=None TEST=Compiles successfully. Change-Id: I86f09516d3cddd619fef23a4659c9e4eadbcf3fa Signed-off-by: Furquan Shaikh Reviewed-on: https://review.coreboot.org/18340 Reviewed-by: Duncan Laurie Tested-by: build bot (Jenkins) --- src/include/device/device.h | 2 ++ src/include/device/path.h | 10 +++++++++- src/include/device/spi.h | 30 ++++++++++++++++++++++++++++++ 3 files changed, 41 insertions(+), 1 deletion(-) create mode 100644 src/include/device/spi.h (limited to 'src/include') diff --git a/src/include/device/device.h b/src/include/device/device.h index 47509f7df6..e21384ba0a 100644 --- a/src/include/device/device.h +++ b/src/include/device/device.h @@ -23,6 +23,7 @@ struct pci_bus_operations; struct i2c_bus_operations; struct smbus_bus_operations; struct pnp_mode_ops; +struct spi_bus_operations; /* Chip operations */ struct chip_operations { @@ -64,6 +65,7 @@ struct device_operations { #endif const struct pci_operations *ops_pci; const struct i2c_bus_operations *ops_i2c_bus; + const struct spi_bus_operations *ops_spi_bus; const struct smbus_bus_operations *ops_smbus_bus; const struct pci_bus_operations * (*ops_pci_bus)(device_t dev); const struct pnp_mode_ops *ops_pnp_mode; diff --git a/src/include/device/path.h b/src/include/device/path.h index 9d7fb38d42..849b579455 100644 --- a/src/include/device/path.h +++ b/src/include/device/path.h @@ -14,6 +14,7 @@ enum device_path_type { DEVICE_PATH_CPU_BUS, DEVICE_PATH_IOAPIC, DEVICE_PATH_GENERIC, + DEVICE_PATH_SPI, /* * When adding path types to this table, please also update the @@ -33,7 +34,8 @@ enum device_path_type { "DEVICE_PATH_CPU", \ "DEVICE_PATH_CPU_BUS", \ "DEVICE_PATH_IOAPIC", \ - "DEVICE_PATH_GENERIC" \ + "DEVICE_PATH_GENERIC", \ + "DEVICE_PATH_SPI", \ } struct domain_path @@ -58,6 +60,11 @@ struct i2c_path unsigned mode_10bit; }; +struct spi_path +{ + unsigned cs; +}; + struct apic_path { unsigned apic_id; @@ -107,6 +114,7 @@ struct device_path { struct cpu_path cpu; struct cpu_bus_path cpu_bus; struct generic_path generic; + struct spi_path spi; }; }; diff --git a/src/include/device/spi.h b/src/include/device/spi.h new file mode 100644 index 0000000000..4315ebce14 --- /dev/null +++ b/src/include/device/spi.h @@ -0,0 +1,30 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2017 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __DEVICE_SPI_H__ +#define __DEVICE_SPI_H__ + +struct device; +struct spi_bus_operations { + /* + * This is a SoC-specific method that can be provided to translate the + * 'struct device' for a SPI controller into a unique SPI bus + * number. Returns -1 if the bus number for this bus cannot be + * determined. + */ + int (*dev_to_bus)(struct device *dev); +}; + +#endif /* __DEVICE_SPI_H__ */ -- cgit v1.2.3