bmi260: back out support for compressed config file

Now that the BMI260 config file can be moved to the .init_rom section,
the simple compression scheme is no longer needed.

BUG=b:160330682
BRANCH=none
TEST=make buildall
TEST=Verify BMI260 operation on both volteer and volteer_tcpmv1 builds
using "ectool motionsense lid_angle".

Signed-off-by: Keith Short <keithshort@chromium.org>
Change-Id: I83bbaadcd3dade2d585b771b6b9ebae7e9fdc0cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2354194
Reviewed-by: Jett Rink <jettrink@chromium.org>
Reviewed-by: caveh jalali <caveh@chromium.org>

2 files changed, 6 insertions, 175 deletions

diff --git a/driver/accelgyro_bmi260.c b/driver/accelgyro_bmi260.c
index 6e5fcda86a..6eeb80cb04 100644
--- a/driver/accelgyro_bmi260.c
+++ b/driver/accelgyro_bmi260.c
@@ -380,8 +380,11 @@ static int irq_handler(struct motion_sensor_t *s, uint32_t *event)
 }
 #endif  /* CONFIG_ACCEL_INTERRUPTS */
 
-#if defined(CONFIG_ACCELGYRO_BMI160_COMPRESSED_CONFIG) || \
-	defined(CONFIG_CHIP_INIT_ROM_REGION)
+/*
+ * If the .init_rom section is not memory mapped, we need a static
+ * buffer in RAM to access the BMI configuration data.
+ */
+#ifdef CONFIG_CHIP_INIT_ROM_REGION
 #define BMI_RAM_BUFFER_SIZE		256
 static uint8_t bmi_ram_buffer[BMI_RAM_BUFFER_SIZE];
 #else
@@ -389,163 +392,6 @@ static uint8_t bmi_ram_buffer[BMI_RAM_BUFFER_SIZE];
 static uint8_t *bmi_ram_buffer;
 #endif
 
-/*
- * TODO(b/160330682): Eliminate or reduce size of BMI260 initialization file.
- * Remove this option once the BMI260 initialization file is moved to the
- * kernel rootfs.
- */
-#ifdef CONFIG_ACCELGYRO_BMI160_COMPRESSED_CONFIG
-
-#define INCBIN_STYLE INCBIN_STYLE_SNAKE
-#define INCBIN_PREFIX
-#include "third_party/incbin/incbin.h"
-INCBIN(bmi260_config,
-	"third_party/bmi260/accelgyro_bmi260_config_compressed.bin");
-
-#define COMPRESS_KEY		0xE9EA
-static int bmi_buffer_bytes;
-static int bmi_config_offset;
-
-static int write_bmi_data(const struct motion_sensor_t *s)
-{
-	uint8_t addr[2];
-	int ret;
-
-	if (bmi_buffer_bytes == 0)
-		return EC_SUCCESS;
-
-	addr[0] = (bmi_config_offset / 2) & 0xF;
-	addr[1] = (bmi_config_offset / 2) >> 4;
-	ret = bmi_write_n(s->port, s->i2c_spi_addr_flags,
-			  BMI260_INIT_ADDR_0, addr, 2);
-	if (ret)
-		return ret;
-
-	ret = bmi_write_n(s->port, s->i2c_spi_addr_flags,
-			  BMI260_INIT_DATA, bmi_ram_buffer,
-			  bmi_buffer_bytes);
-	if (ret)
-		return ret;
-
-	bmi_config_offset += bmi_buffer_bytes;
-	bmi_buffer_bytes = 0;
-
-	return EC_SUCCESS;
-}
-
-/*
- * Stores 4 bytes of BMI configuration data into a static buffer. If the buffer
- * is filled, write the buffer contents over I2C.
- */
-static int enqueue_bmi_data(const struct motion_sensor_t *s, uint32_t *data)
-{
-	int ret;
-
-	memcpy(&bmi_ram_buffer[bmi_buffer_bytes], data, 4);
-	bmi_buffer_bytes += 4;
-
-	if (bmi_buffer_bytes >= BMI_RAM_BUFFER_SIZE) {
-		ret = write_bmi_data(s);
-		if (ret)
-			return ret;
-	}
-
-	return EC_SUCCESS;
-}
-
-/*
- * Load the BMI configuration data from a compressed buffer.
- *
- * Compression scheme:
- *	Repeated 32-bit words are replaced by a 16-bit key, 16-bit count, and
- *	the 32-bit data word. All values stored big-endian.
- *
- *	For example, if the uncompressed file had the following data words:
- *		0x89ABCDEF 0x89ABCDEF 0x89ABCDEF
- *
- *	This is represented compressed as (key 0xE9EA):
- *		0xE9EA0003 0x89ABCDEF
- *
- *	Key value (0xE9EA) chosen as it wasn't found in the BMI configuration
- *	data.
- */
-int bmi_compressed_config_load(const struct motion_sensor_t *s)
-{
-	uint32_t *bmi_compressed_config = (uint32_t *)bmi260_config_data;
-	int length = bmi260_config_size;
-	int i;
-	int output_offset;
-	uint16_t *buf16;
-	uint16_t key;
-	uint16_t repeat_count;
-	uint32_t *data32;
-	int ret;
-
-	length /= sizeof(uint32_t);
-
-	bmi_buffer_bytes = 0;
-	bmi_config_offset = 0;
-
-	output_offset = 0;
-
-	for (i = 0; i < length; i++) {
-		buf16 = (uint16_t *)&bmi_compressed_config[i];
-		key = be16toh(*buf16);
-
-		if (key == COMPRESS_KEY) {
-			repeat_count = be16toh(*++buf16);
-
-			if (repeat_count == 0) {
-				CPRINTF("BMI260 config: invalid repeat count "
-					"found at word offset %d\n",
-					i);
-				return EC_ERROR_UNKNOWN;
-			}
-
-			/*
-			 * Advance to the next word in the buffer, which
-			 * contains the actual data to write.
-			 */
-			if (++i >= length) {
-				CPRINTF("BMI260 config: "
-					"Unexpected end of file\n");
-				return EC_ERROR_UNKNOWN;
-			}
-
-			data32 = &bmi_compressed_config[i];
-
-			while (repeat_count-- > 0) {
-				ret = enqueue_bmi_data(s, data32);
-				if (ret)
-					return ret;
-
-				output_offset += 4;
-			}
-		} else {
-			data32 = &bmi_compressed_config[i];
-			ret = enqueue_bmi_data(s, data32);
-			if (ret)
-				return ret;
-
-			output_offset += 4;
-		}
-	}
-
-	ret = write_bmi_data(s);
-
-	return ret;
-}
-
-static int bmi_config_load(const struct motion_sensor_t *s)
-{
-	return EC_ERROR_UNKNOWN;
-}
-#else /* !CONFIG_ACCELGYRO_BMI160_COMPRESSED_CONFIG */
-static int bmi_compressed_config_load(const struct motion_sensor_t *s)
-{
-	return EC_ERROR_UNKNOWN;
-}
-
 static int bmi_config_load(const struct motion_sensor_t *s)
 {
 	int ret = EC_SUCCESS;
@@ -621,8 +467,6 @@ static int bmi_config_load(const struct motion_sensor_t *s)
 	return ret;
 }
 
-#endif /* CONFIG_ACCELGYRO_BMI160_COMPRESSED_CONFIG */
-
 static int init_config(const struct motion_sensor_t *s)
 {
 	int init_status, ret;
@@ -635,10 +479,7 @@ static int init_config(const struct motion_sensor_t *s)
 	bmi_write8(s->port, s->i2c_spi_addr_flags, BMI260_INIT_CTRL, 0);
 
 	/* load config file to INIT_DATA */
-	if (IS_ENABLED(CONFIG_ACCELGYRO_BMI160_COMPRESSED_CONFIG))
-		ret = bmi_compressed_config_load(s);
-	else
-		ret = bmi_config_load(s);
+	ret = bmi_config_load(s);
 
 	/* finish config load */
 	bmi_write8(s->port, s->i2c_spi_addr_flags, BMI260_INIT_CTRL, 1);
diff --git a/include/config.h b/include/config.h
index 18c377faf1..8ea8c2c24c 100644
--- a/include/config.h
+++ b/include/config.h
@@ -193,16 +193,6 @@
 #undef CONFIG_ACCELGYRO_BMI160_INT2_OUTPUT
 #undef CONFIG_ACCELGYRO_BMI260_INT2_OUTPUT
 
-/*
- * If defined, use a compressed version of the BMI260 configuration file.
- * Saves a net of about 900 bytes of flash space.
- *
- * TODO(b/160330682): Eliminate or reduce size of BMI260 initialization file.
- * Remove this option once the BMI260 initialization file is moved to the
- * kernel rootfs.
- */
-#undef CONFIG_ACCELGYRO_BMI160_COMPRESSED_CONFIG
-
 /* Specify type of Gyrometers attached. */
 #undef CONFIG_GYRO_L3GD20H