cbfs: new API and better program loading

A new CBFS API is introduced to allow making CBFS access
easier for providing multiple CBFS sources. That is achieved
by decoupling the cbfs source from a CBFS file. A CBFS
source is described by a descriptor. It contains the necessary
properties for walking a CBFS to locate a file. The CBFS
file is then decoupled from the CBFS descriptor in that it's
no longer needed to access the contents of the file.

All of this is accomplished using the regions infrastructure
by repsenting CBFS sources and files as region_devices. Because
region_devices can be chained together forming subregions this
allows one to decouple a CBFS source from a file. This also allows
one to provide CBFS files that came from other sources for
payload and/or stage loading.

The program loading takes advantage of those very properties
by allowing multiple sources for locating a program. Because of
this we can reduce the overhead of loading programs because
it's all done in the common code paths. Only locating the
program is per source.

Change-Id: I339b84fce95f03d1dbb63a0f54a26be5eb07f7c8
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/9134
Tested-by: build bot (Jenkins)
Tested-by: Raptor Engineering Automated Test Stand <noreply@raptorengineeringinc.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

2 files changed, 6 insertions, 84 deletions

diff --git a/src/soc/nvidia/tegra132/ccplex.c b/src/soc/nvidia/tegra132/ccplex.c
index 7ab752fbc4..e133b48482 100644
--- a/src/soc/nvidia/tegra132/ccplex.c
+++ b/src/soc/nvidia/tegra132/ccplex.c
@@ -75,10 +75,9 @@ static int ccplex_start(void)
 
 int ccplex_load_mts(void)
 {
-	struct cbfs_file file;
-	ssize_t offset;
-	size_t nread;
+	ssize_t nread;
 	struct stopwatch sw;
+	struct region_device fh;
 
 	/*
 	 * MTS location is hard coded to this magic address. The hardware will
@@ -86,21 +85,19 @@ int ccplex_load_mts(void)
 	 * place in the carveout region.
 	 */
 	void * const mts = (void *)(uintptr_t)MTS_LOAD_ADDRESS;
-	struct cbfs_media *media = CBFS_DEFAULT_MEDIA;
 
 	stopwatch_init(&sw);
-	offset = cbfs_locate_file(media, &file, MTS_FILE_NAME);
-	if (offset < 0) {
+	if (cbfs_boot_locate(&fh, MTS_FILE_NAME, NULL)) {
 		printk(BIOS_DEBUG, "MTS file not found: %s\n", MTS_FILE_NAME);
 		return -1;
 	}
 
 	/* Read MTS file into the carveout region. */
-	nread = cbfs_read(media, mts, offset, file.len);
+	nread = rdev_readat(&fh, mts, 0, region_device_sz(&fh));
 
-	if (nread != file.len) {
+	if (nread != region_device_sz(&fh)) {
 		printk(BIOS_DEBUG, "MTS bytes read (%zu) != file length(%u)!\n",
-			nread, file.len);
+			nread, region_device_sz(&fh));
 		return -1;
 	}
 
diff --git a/src/soc/nvidia/tegra132/spi.c b/src/soc/nvidia/tegra132/spi.c
index 1650057fab..efe43343ca 100644
--- a/src/soc/nvidia/tegra132/spi.c
+++ b/src/soc/nvidia/tegra132/spi.c
@@ -817,18 +817,6 @@ int spi_xfer(struct spi_slave *slave, const void *dout,
 	return ret;
 }
 
-static int tegra_spi_cbfs_open(struct cbfs_media *media)
-{
-	DEBUG_SPI("tegra_spi_cbfs_open\n");
-	return 0;
-}
-
-static int tegra_spi_cbfs_close(struct cbfs_media *media)
-{
-	DEBUG_SPI("tegra_spi_cbfs_close\n");
-	return 0;
-}
-
 #define JEDEC_READ			0x03
 #define JEDEC_READ_OUTSIZE		0x04
 #define JEDEC_FAST_READ_DUAL		0x3b
@@ -892,69 +880,6 @@ tegra_spi_cbfs_read_exit:
 	return ret;
 }
 
-static size_t tegra_spi_cbfs_read(struct cbfs_media *media, void *dest,
-				size_t offset, size_t count)
-{
-	const struct region_device *boot_dev;
-
-	boot_dev = media->context;
-
-	DEBUG_SPI("%s: reading %zx bytes from %zx\n", __func__, count, offset);
-
-	if (rdev_readat(boot_dev, dest, offset, count) < 0)
-		return 0;
-
-	return count;
-}
-
-static void *tegra_spi_cbfs_map(struct cbfs_media *media, size_t offset,
-				 size_t count)
-{
-	const struct region_device *boot_dev;
-	void *map;
-
-	DEBUG_SPI("tegra_spi_cbfs_map\n");
-
-	boot_dev = media->context;
-
-	map = rdev_mmap(boot_dev, offset, count);
-
-	if (map == NULL)
-		map = (void *)-1;
-
-	return map;
-}
-
-static void *tegra_spi_cbfs_unmap(struct cbfs_media *media,
-				   const void *address)
-{
-	const struct region_device *boot_dev;
-
-	DEBUG_SPI("tegra_spi_cbfs_unmap\n");
-
-	boot_dev = media->context;
-
-	rdev_munmap(boot_dev, (void *)address);
-
-	return NULL;
-}
-
-int init_default_cbfs_media(struct cbfs_media *media)
-{
-	DEBUG_SPI("Initializing CBFS media on SPI\n");
-
-	boot_device_init();
-
-	media->context = (void *)boot_device_ro();
-	media->open = tegra_spi_cbfs_open;
-	media->close = tegra_spi_cbfs_close;
-	media->read = tegra_spi_cbfs_read;
-	media->map = tegra_spi_cbfs_map;
-	media->unmap = tegra_spi_cbfs_unmap;
-
-	return 0;
-}
-
 struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
 {
 	struct tegra_spi_channel *channel = to_tegra_spi(bus);