Messages in this thread Patch in this message | | | From | Mike Frysinger <> | Subject | [PATCH] sigma-firmware: loader for Analog Devices' SigmaStudio | Date | Wed, 12 Jan 2011 00:41:31 -0500 |
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Analog Devices' SigmaStudio can produce firmware blobs for devices with these DSPs embedded (like some audio codecs). Allow these device drivers to easily parse and load them.
Signed-off-by: Mike Frysinger <vapier@gentoo.org> --- drivers/firmware/Kconfig | 12 +++++ drivers/firmware/Makefile | 1 + drivers/firmware/sigma.c | 110 +++++++++++++++++++++++++++++++++++++++++++++ include/linux/sigma.h | 60 ++++++++++++++++++++++++ 4 files changed, 183 insertions(+), 0 deletions(-) create mode 100644 drivers/firmware/sigma.c create mode 100644 include/linux/sigma.h
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig index e8b6a13..8f4f7b2 100644 --- a/drivers/firmware/Kconfig +++ b/drivers/firmware/Kconfig @@ -134,4 +134,16 @@ 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 1c3c173..ede9722 100644 --- a/drivers/firmware/Makefile +++ b/drivers/firmware/Makefile @@ -11,3 +11,4 @@ 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 0000000..e2945be --- /dev/null +++ b/drivers/firmware/sigma.c @@ -0,0 +1,110 @@ +/* + * Load Analog Devices SigmaStudio firmware files + * + * Copyright 2009 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 */ +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; +} + +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; + + 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 */ + if (fw->size < sizeof(*ssfw_head)) { + ret = -ENODATA; + goto done; + } + ssfw_head = (void *)fw->data; + if (memcmp(ssfw_head->magic, SIGMA_MAGIC, ARRAY_SIZE(ssfw_head->magic))) { + ret = -EINVAL; + goto done; + } + pr_debug("%s: crc=%x\n", __func__, crc32(0, fw->data, fw->size)); + + 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); diff --git a/include/linux/sigma.h b/include/linux/sigma.h new file mode 100644 index 0000000..510765f --- /dev/null +++ b/include/linux/sigma.h @@ -0,0 +1,60 @@ +/* + * Load firmware files from Analog Devices SigmaStudio + * + * Copyright 2009 Analog Devices Inc. + * + * Licensed under the GPL-2 or later. + */ + +#ifndef __SIGMA_FIRMWARE_H__ +#define __SIGMA_FIRMWARE_H__ + +#include <linux/firmware.h> +#include <linux/types.h> + +#define SIGMA_MAGIC "ADISIGM" + +struct sigma_firmware { + const struct firmware *fw; + size_t pos; +}; + +struct sigma_firmware_header { + unsigned char magic[7]; + u8 version; + u32 crc; +}; + +enum { + SIGMA_ACTION_WRITEXBYTES = 0, + SIGMA_ACTION_WRITESINGLE, + SIGMA_ACTION_WRITESAFELOAD, + SIGMA_ACTION_DELAY, + SIGMA_ACTION_PLLWAIT, + SIGMA_ACTION_NOOP, + SIGMA_ACTION_END, +}; + +struct sigma_action { + u8 instr; + u8 len_hi; + u16 len; + u16 addr; + unsigned char payload[]; +}; + +static inline u32 sigma_action_len(struct sigma_action *sa) +{ + return (sa->len_hi << 16) | sa->len; +} + +static inline size_t sigma_action_size(struct sigma_action *sa, u32 payload_len) +{ + return sizeof(*sa) + payload_len + (payload_len % 2); +} + +struct i2c_client; + +extern int process_sigma_firmware(struct i2c_client *client, const char *name); + +#endif -- 1.7.4.rc1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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