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Diffstat (limited to 'drivers/firmware')
-rw-r--r--drivers/firmware/Kconfig12
-rw-r--r--drivers/firmware/Makefile1
-rw-r--r--drivers/firmware/sigma.c115
3 files changed, 128 insertions, 0 deletions
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 3c56afc5eb1b..b3a25a55ba23 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -145,4 +145,16 @@ config ISCSI_IBFT
detect iSCSI boot parameters dynamically during system boot, say Y.
Otherwise, say N.
+config SIGMA
+ tristate "SigmaStudio firmware loader"
+ depends on I2C
+ select CRC32
+ default n
+ help
+ Enable helper functions for working with Analog Devices SigmaDSP
+ parts and binary firmwares produced by Analog Devices SigmaStudio.
+
+ If unsure, say N here. Drivers that need these helpers will select
+ this option automatically.
+
endmenu
diff --git a/drivers/firmware/Makefile b/drivers/firmware/Makefile
index 20c17fca1232..00bb0b80a79f 100644
--- a/drivers/firmware/Makefile
+++ b/drivers/firmware/Makefile
@@ -12,3 +12,4 @@ obj-$(CONFIG_DMIID) += dmi-id.o
obj-$(CONFIG_ISCSI_IBFT_FIND) += iscsi_ibft_find.o
obj-$(CONFIG_ISCSI_IBFT) += iscsi_ibft.o
obj-$(CONFIG_FIRMWARE_MEMMAP) += memmap.o
+obj-$(CONFIG_SIGMA) += sigma.o
diff --git a/drivers/firmware/sigma.c b/drivers/firmware/sigma.c
new file mode 100644
index 000000000000..c19cd2c39fa6
--- /dev/null
+++ b/drivers/firmware/sigma.c
@@ -0,0 +1,115 @@
+/*
+ * Load Analog Devices SigmaStudio firmware files
+ *
+ * Copyright 2009-2011 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/crc32.h>
+#include <linux/delay.h>
+#include <linux/firmware.h>
+#include <linux/kernel.h>
+#include <linux/i2c.h>
+#include <linux/sigma.h>
+
+/* Return: 0==OK, <0==error, =1 ==no more actions */
+static int
+process_sigma_action(struct i2c_client *client, struct sigma_firmware *ssfw)
+{
+ struct sigma_action *sa = (void *)(ssfw->fw->data + ssfw->pos);
+ size_t len = sigma_action_len(sa);
+ int ret = 0;
+
+ pr_debug("%s: instr:%i addr:%#x len:%zu\n", __func__,
+ sa->instr, sa->addr, len);
+
+ switch (sa->instr) {
+ case SIGMA_ACTION_WRITEXBYTES:
+ case SIGMA_ACTION_WRITESINGLE:
+ case SIGMA_ACTION_WRITESAFELOAD:
+ if (ssfw->fw->size < ssfw->pos + len)
+ return -EINVAL;
+ ret = i2c_master_send(client, (void *)&sa->addr, len);
+ if (ret < 0)
+ return -EINVAL;
+ break;
+
+ case SIGMA_ACTION_DELAY:
+ ret = 0;
+ udelay(len);
+ len = 0;
+ break;
+
+ case SIGMA_ACTION_END:
+ return 1;
+
+ default:
+ return -EINVAL;
+ }
+
+ /* when arrive here ret=0 or sent data */
+ ssfw->pos += sigma_action_size(sa, len);
+ return ssfw->pos == ssfw->fw->size;
+}
+
+static int
+process_sigma_actions(struct i2c_client *client, struct sigma_firmware *ssfw)
+{
+ pr_debug("%s: processing %p\n", __func__, ssfw);
+
+ while (1) {
+ int ret = process_sigma_action(client, ssfw);
+ pr_debug("%s: action returned %i\n", __func__, ret);
+ if (ret == 1)
+ return 0;
+ else if (ret)
+ return ret;
+ }
+}
+
+int process_sigma_firmware(struct i2c_client *client, const char *name)
+{
+ int ret;
+ struct sigma_firmware_header *ssfw_head;
+ struct sigma_firmware ssfw;
+ const struct firmware *fw;
+ u32 crc;
+
+ pr_debug("%s: loading firmware %s\n", __func__, name);
+
+ /* first load the blob */
+ ret = request_firmware(&fw, name, &client->dev);
+ if (ret) {
+ pr_debug("%s: request_firmware() failed with %i\n", __func__, ret);
+ return ret;
+ }
+ ssfw.fw = fw;
+
+ /* then verify the header */
+ ret = -EINVAL;
+ if (fw->size < sizeof(*ssfw_head))
+ goto done;
+
+ ssfw_head = (void *)fw->data;
+ if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic)))
+ goto done;
+
+ crc = crc32(0, fw->data, fw->size);
+ pr_debug("%s: crc=%x\n", __func__, crc);
+ if (crc != ssfw_head->crc)
+ goto done;
+
+ ssfw.pos = sizeof(*ssfw_head);
+
+ /* finally process all of the actions */
+ ret = process_sigma_actions(client, &ssfw);
+
+ done:
+ release_firmware(fw);
+
+ pr_debug("%s: loaded %s\n", __func__, name);
+
+ return ret;
+}
+EXPORT_SYMBOL(process_sigma_firmware);