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authorFurquan Shaikh <furquan@chromium.org>2017-02-11 10:57:23 -0800
committerFurquan Shaikh <furquan@google.com>2017-02-16 08:41:28 +0100
commit7606c377f56ab68421aa482b1ded6840d426e197 (patch)
treee25c60cc8e33127ce9193c7190ff8e1299d173fd /src
parente67002968b6ebc69c5a94fb2cee17af3845268c9 (diff)
downloadcoreboot-7606c377f56ab68421aa482b1ded6840d426e197.tar.xz
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 <furquan@chromium.org> Reviewed-on: https://review.coreboot.org/18340 Reviewed-by: Duncan Laurie <dlaurie@chromium.org> Tested-by: build bot (Jenkins)
Diffstat (limited to 'src')
-rw-r--r--src/device/device_util.c10
-rw-r--r--src/include/device/device.h2
-rw-r--r--src/include/device/path.h10
-rw-r--r--src/include/device/spi.h30
4 files changed, 51 insertions, 1 deletions
diff --git a/src/device/device_util.c b/src/device/device_util.c
index 1a0a60fdb3..e31ade56c0 100644
--- a/src/device/device_util.c
+++ b/src/device/device_util.c
@@ -250,6 +250,9 @@ u32 dev_path_encode(device_t dev)
case DEVICE_PATH_GENERIC:
ret |= dev->path.generic.subid << 8 | dev->path.generic.id;
break;
+ case DEVICE_PATH_SPI:
+ ret |= dev->path.spi.cs;
+ break;
case DEVICE_PATH_NONE:
default:
break;
@@ -319,6 +322,10 @@ const char *dev_path(device_t dev)
"GENERIC: %d.%d", dev->path.generic.id,
dev->path.generic.subid);
break;
+ case DEVICE_PATH_SPI:
+ snprintf(buffer, sizeof (buffer), "SPI: %02x",
+ dev->path.spi.cs);
+ break;
default:
printk(BIOS_ERR, "Unknown device path type: %d\n",
dev->path.type);
@@ -390,6 +397,9 @@ int path_eq(struct device_path *path1, struct device_path *path2)
equal = (path1->generic.id == path2->generic.id) &&
(path1->generic.subid == path2->generic.subid);
break;
+ case DEVICE_PATH_SPI:
+ equal = (path1->spi.cs == path2->spi.cs);
+ break;
default:
printk(BIOS_ERR, "Unknown device type: %d\n", path1->type);
break;
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__ */