sound/soc/intel/sst-baytrail-dsp.c - maze/linux - Git at Google

 /*
  * Intel Baytrail SST DSP driver
  * Copyright (c) 2014, Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope 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.
  */

 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
 #include <linux/module.h>
 #include <linux/dma-mapping.h>
 #include <linux/platform_device.h>
 #include <linux/firmware.h>

 #include "sst-dsp.h"
 #include "sst-dsp-priv.h"
 #include "sst-baytrail-ipc.h"

 #define SST_BYT_FW_SIGNATURE_SIZE	4
 #define SST_BYT_FW_SIGN			"$SST"

 #define SST_BYT_IRAM_OFFSET	0xC0000
 #define SST_BYT_DRAM_OFFSET	0x100000
 #define SST_BYT_SHIM_OFFSET	0x140000

 enum sst_ram_type {
 	SST_BYT_IRAM	= 1,
 	SST_BYT_DRAM	= 2,
 	SST_BYT_CACHE	= 3,
 };

 struct dma_block_info {
 	enum sst_ram_type	type;	/* IRAM/DRAM */
 	u32			size;	/* Bytes */
 	u32			ram_offset; /* Offset in I/DRAM */
 	u32			rsvd;	/* Reserved field */
 };

 struct fw_header {
 	unsigned char signature[SST_BYT_FW_SIGNATURE_SIZE];
 	u32 file_size; /* size of fw minus this header */
 	u32 modules; /*  # of modules */
 	u32 file_format; /* version of header format */
 	u32 reserved[4];
 };

 struct sst_byt_fw_module_header {
 	unsigned char signature[SST_BYT_FW_SIGNATURE_SIZE];
 	u32 mod_size; /* size of module */
 	u32 blocks; /* # of blocks */
 	u32 type; /* codec type, pp lib */
 	u32 entry_point;
 };

 static int sst_byt_parse_module(struct sst_dsp *dsp, struct sst_fw *fw,
 				struct sst_byt_fw_module_header *module)
 {
 	struct dma_block_info *block;
 	struct sst_module *mod;
 	struct sst_module_data block_data;
 	struct sst_module_template template;
 	int count;

 	memset(&template, 0, sizeof(template));
 	template.id = module->type;
 	template.entry = module->entry_point;
 	template.p.type = SST_MEM_DRAM;
 	template.p.data_type = SST_DATA_P;
 	template.s.type = SST_MEM_DRAM;
 	template.s.data_type = SST_DATA_S;

 	mod = sst_module_new(fw, &template, NULL);
 	if (mod == NULL)
 		return -ENOMEM;

 	block = (void *)module + sizeof(*module);

 	for (count = 0; count < module->blocks; count++) {

 		if (block->size <= 0) {
 			dev_err(dsp->dev, "block %d size invalid\n", count);
 			return -EINVAL;
 		}

 		switch (block->type) {
 		case SST_BYT_IRAM:
 			block_data.offset = block->ram_offset +
 					    dsp->addr.iram_offset;
 			block_data.type = SST_MEM_IRAM;
 			break;
 		case SST_BYT_DRAM:
 			block_data.offset = block->ram_offset +
 					    dsp->addr.dram_offset;
 			block_data.type = SST_MEM_DRAM;
 			break;
 		case SST_BYT_CACHE:
 			block_data.offset = block->ram_offset +
 					    (dsp->addr.fw_ext - dsp->addr.lpe);
 			block_data.type = SST_MEM_CACHE;
 			break;
 		default:
 			dev_err(dsp->dev, "wrong ram type 0x%x in block0x%x\n",
 				block->type, count);
 			return -EINVAL;
 		}

 		block_data.size = block->size;
 		block_data.data_type = SST_DATA_M;
 		block_data.data = (void *)block + sizeof(*block);

 		sst_module_insert_fixed_block(mod, &block_data);

 		block = (void *)block + sizeof(*block) + block->size;
 	}
 	return 0;
 }

 static int sst_byt_parse_fw_image(struct sst_fw *sst_fw)
 {
 	struct fw_header *header;
 	struct sst_byt_fw_module_header *module;
 	struct sst_dsp *dsp = sst_fw->dsp;
 	int ret, count;

 	/* Read the header information from the data pointer */
 	header = (struct fw_header *)sst_fw->dma_buf;

 	/* verify FW */
 	if ((strncmp(header->signature, SST_BYT_FW_SIGN, 4) != 0) ||
 	    (sst_fw->size != header->file_size + sizeof(*header))) {
 		/* Invalid FW signature */
 		dev_err(dsp->dev, "Invalid FW sign/filesize mismatch\n");
 		return -EINVAL;
 	}

 	dev_dbg(dsp->dev,
 		"header sign=%4s size=0x%x modules=0x%x fmt=0x%x size=%zu\n",
 		header->signature, header->file_size, header->modules,
 		header->file_format, sizeof(*header));

 	module = (void *)sst_fw->dma_buf + sizeof(*header);
 	for (count = 0; count < header->modules; count++) {
 		/* module */
 		ret = sst_byt_parse_module(dsp, sst_fw, module);
 		if (ret < 0) {
 			dev_err(dsp->dev, "invalid module %d\n", count);
 			return ret;
 		}
 		module = (void *)module + sizeof(*module) + module->mod_size;
 	}

 	return 0;
 }

 static void sst_byt_dump_shim(struct sst_dsp *sst)
 {
 	int i;
 	u64 reg;

 	for (i = 0; i <= 0xF0; i += 8) {
 		reg = sst_dsp_shim_read64_unlocked(sst, i);
 		if (reg)
 			dev_dbg(sst->dev, "shim 0x%2.2x value 0x%16.16llx\n",
 				i, reg);
 	}

 	for (i = 0x00; i <= 0xff; i += 4) {
 		reg = readl(sst->addr.pci_cfg + i);
 		if (reg)
 			dev_dbg(sst->dev, "pci 0x%2.2x value 0x%8.8x\n",
 				i, (u32)reg);
 	}
 }

 static irqreturn_t sst_byt_irq(int irq, void *context)
 {
 	struct sst_dsp *sst = (struct sst_dsp *) context;
 	u64 isrx;
 	irqreturn_t ret = IRQ_NONE;

 	spin_lock(&sst->spinlock);

 	isrx = sst_dsp_shim_read64_unlocked(sst, SST_ISRX);
 	if (isrx & SST_ISRX_DONE) {
 		/* ADSP has processed the message request from IA */
 		sst_dsp_shim_update_bits64_unlocked(sst, SST_IPCX,
 						    SST_BYT_IPCX_DONE, 0);
 		ret = IRQ_WAKE_THREAD;
 	}
 	if (isrx & SST_BYT_ISRX_REQUEST) {
 		/* mask message request from ADSP and do processing later */
 		sst_dsp_shim_update_bits64_unlocked(sst, SST_IMRX,
 						    SST_BYT_IMRX_REQUEST,
 						    SST_BYT_IMRX_REQUEST);
 		ret = IRQ_WAKE_THREAD;
 	}

 	spin_unlock(&sst->spinlock);

 	return ret;
 }

 static void sst_byt_boot(struct sst_dsp *sst)
 {
 	int tries = 10;

 	/* release stall and wait to unstall */
 	sst_dsp_shim_update_bits64(sst, SST_CSR, SST_BYT_CSR_STALL, 0x0);
 	while (tries--) {
 		if (!(sst_dsp_shim_read64(sst, SST_CSR) &
 		      SST_BYT_CSR_PWAITMODE))
 			break;
 		msleep(100);
 	}
 	if (tries < 0) {
 		dev_err(sst->dev, "unable to start DSP\n");
 		sst_byt_dump_shim(sst);
 	}
 }

 static void sst_byt_reset(struct sst_dsp *sst)
 {
 	/* put DSP into reset, set reset vector and stall */
 	sst_dsp_shim_update_bits64(sst, SST_CSR,
 		SST_BYT_CSR_RST | SST_BYT_CSR_VECTOR_SEL | SST_BYT_CSR_STALL,
 		SST_BYT_CSR_RST | SST_BYT_CSR_VECTOR_SEL | SST_BYT_CSR_STALL);

 	udelay(10);

 	/* take DSP out of reset and keep stalled for FW loading */
 	sst_dsp_shim_update_bits64(sst, SST_CSR, SST_BYT_CSR_RST, 0);
 }

 struct sst_adsp_memregion {
 	u32 start;
 	u32 end;
 	int blocks;
 	enum sst_mem_type type;
 };

 /* BYT test stuff */
 static const struct sst_adsp_memregion byt_region[] = {
 	{0xC0000, 0x100000, 8, SST_MEM_IRAM}, /* I-SRAM - 8 * 32kB */
 	{0x100000, 0x140000, 8, SST_MEM_DRAM}, /* D-SRAM0 - 8 * 32kB */
 };

 static int sst_byt_resource_map(struct sst_dsp *sst, struct sst_pdata *pdata)
 {
 	sst->addr.lpe_base = pdata->lpe_base;
 	sst->addr.lpe = ioremap(pdata->lpe_base, pdata->lpe_size);
 	if (!sst->addr.lpe)
 		return -ENODEV;

 	/* ADSP PCI MMIO config space */
 	sst->addr.pci_cfg = ioremap(pdata->pcicfg_base, pdata->pcicfg_size);
 	if (!sst->addr.pci_cfg) {
 		iounmap(sst->addr.lpe);
 		return -ENODEV;
 	}

 	/* SST Extended FW allocation */
 	sst->addr.fw_ext = ioremap(pdata->fw_base, pdata->fw_size);
 	if (!sst->addr.fw_ext) {
 		iounmap(sst->addr.pci_cfg);
 		iounmap(sst->addr.lpe);
 		return -ENODEV;
 	}

 	/* SST Shim */
 	sst->addr.shim = sst->addr.lpe + sst->addr.shim_offset;

 	sst_dsp_mailbox_init(sst, SST_BYT_MAILBOX_OFFSET + 0x204,
 			     SST_BYT_IPC_MAX_PAYLOAD_SIZE,
 			     SST_BYT_MAILBOX_OFFSET,
 			     SST_BYT_IPC_MAX_PAYLOAD_SIZE);

 	sst->irq = pdata->irq;

 	return 0;
 }

 static int sst_byt_init(struct sst_dsp *sst, struct sst_pdata *pdata)
 {
 	const struct sst_adsp_memregion *region;
 	struct device *dev;
 	int ret = -ENODEV, i, j, region_count;
 	u32 offset, size;

 	dev = sst->dev;

 	switch (sst->id) {
 	case SST_DEV_ID_BYT:
 		region = byt_region;
 		region_count = ARRAY_SIZE(byt_region);
 		sst->addr.iram_offset = SST_BYT_IRAM_OFFSET;
 		sst->addr.dram_offset = SST_BYT_DRAM_OFFSET;
 		sst->addr.shim_offset = SST_BYT_SHIM_OFFSET;
 		break;
 	default:
 		dev_err(dev, "failed to get mem resources\n");
 		return ret;
 	}

 	ret = sst_byt_resource_map(sst, pdata);
 	if (ret < 0) {
 		dev_err(dev, "failed to map resources\n");
 		return ret;
 	}

 	/*
 	 * save the physical address of extended firmware block in the first
 	 * 4 bytes of the mailbox
 	 */
 	memcpy_toio(sst->addr.lpe + SST_BYT_MAILBOX_OFFSET,
 	       &pdata->fw_base, sizeof(u32));

 	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
 	if (ret)
 		return ret;

 	/* enable Interrupt from both sides */
 	sst_dsp_shim_update_bits64(sst, SST_IMRX, 0x3, 0x0);
 	sst_dsp_shim_update_bits64(sst, SST_IMRD, 0x3, 0x0);

 	/* register DSP memory blocks - ideally we should get this from ACPI */
 	for (i = 0; i < region_count; i++) {
 		offset = region[i].start;
 		size = (region[i].end - region[i].start) / region[i].blocks;

 		/* register individual memory blocks */
 		for (j = 0; j < region[i].blocks; j++) {
 			sst_mem_block_register(sst, offset, size,
 					       region[i].type, NULL, j, sst);
 			offset += size;
 		}
 	}

 	return 0;
 }

 static void sst_byt_free(struct sst_dsp *sst)
 {
 	sst_mem_block_unregister_all(sst);
 	iounmap(sst->addr.lpe);
 	iounmap(sst->addr.pci_cfg);
 	iounmap(sst->addr.fw_ext);
 }

 struct sst_ops sst_byt_ops = {
 	.reset = sst_byt_reset,
 	.boot = sst_byt_boot,
 	.write = sst_shim32_write,
 	.read = sst_shim32_read,
 	.write64 = sst_shim32_write64,
 	.read64 = sst_shim32_read64,
 	.ram_read = sst_memcpy_fromio_32,
 	.ram_write = sst_memcpy_toio_32,
 	.irq_handler = sst_byt_irq,
 	.init = sst_byt_init,
 	.free = sst_byt_free,
 	.parse_fw = sst_byt_parse_fw_image,
 };
	/*
	* Intel Baytrail SST DSP driver
	* Copyright (c) 2014, Intel Corporation.
	*
	* This program is free software; you can redistribute it and/or modify it
	* under the terms and conditions of the GNU General Public License,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope 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.
	*/

	#include <linux/delay.h>
	#include <linux/fs.h>
	#include <linux/slab.h>
	#include <linux/device.h>
	#include <linux/interrupt.h>
	#include <linux/module.h>
	#include <linux/dma-mapping.h>
	#include <linux/platform_device.h>
	#include <linux/firmware.h>

	#include "sst-dsp.h"
	#include "sst-dsp-priv.h"
	#include "sst-baytrail-ipc.h"

	#define SST_BYT_FW_SIGNATURE_SIZE 4
	#define SST_BYT_FW_SIGN "$SST"

	#define SST_BYT_IRAM_OFFSET 0xC0000
	#define SST_BYT_DRAM_OFFSET 0x100000
	#define SST_BYT_SHIM_OFFSET 0x140000

	enum sst_ram_type {
	SST_BYT_IRAM = 1,
	SST_BYT_DRAM = 2,
	SST_BYT_CACHE = 3,
	};

	struct dma_block_info {
	enum sst_ram_type type; /* IRAM/DRAM */
	u32 size; /* Bytes */
	u32 ram_offset; /* Offset in I/DRAM */
	u32 rsvd; /* Reserved field */
	};

	struct fw_header {
	unsigned char signature[SST_BYT_FW_SIGNATURE_SIZE];
	u32 file_size; /* size of fw minus this header */
	u32 modules; /* # of modules */
	u32 file_format; /* version of header format */
	u32 reserved[4];
	};

	struct sst_byt_fw_module_header {
	unsigned char signature[SST_BYT_FW_SIGNATURE_SIZE];
	u32 mod_size; /* size of module */
	u32 blocks; /* # of blocks */
	u32 type; /* codec type, pp lib */
	u32 entry_point;
	};

	static int sst_byt_parse_module(struct sst_dsp dsp, struct sst_fw fw,
	struct sst_byt_fw_module_header *module)
	{
	struct dma_block_info *block;
	struct sst_module *mod;
	struct sst_module_data block_data;
	struct sst_module_template template;
	int count;

	memset(&template, 0, sizeof(template));
	template.id = module->type;
	template.entry = module->entry_point;
	template.p.type = SST_MEM_DRAM;
	template.p.data_type = SST_DATA_P;
	template.s.type = SST_MEM_DRAM;
	template.s.data_type = SST_DATA_S;

	mod = sst_module_new(fw, &template, NULL);
	if (mod == NULL)
	return -ENOMEM;

	block = (void )module + sizeof(module);

	for (count = 0; count < module->blocks; count++) {

	if (block->size <= 0) {
	dev_err(dsp->dev, "block %d size invalid\n", count);
	return -EINVAL;
	}

	switch (block->type) {
	case SST_BYT_IRAM:
	block_data.offset = block->ram_offset +
	dsp->addr.iram_offset;
	block_data.type = SST_MEM_IRAM;
	break;
	case SST_BYT_DRAM:
	block_data.offset = block->ram_offset +
	dsp->addr.dram_offset;
	block_data.type = SST_MEM_DRAM;
	break;
	case SST_BYT_CACHE:
	block_data.offset = block->ram_offset +
	(dsp->addr.fw_ext - dsp->addr.lpe);
	block_data.type = SST_MEM_CACHE;
	break;
	default:
	dev_err(dsp->dev, "wrong ram type 0x%x in block0x%x\n",
	block->type, count);
	return -EINVAL;
	}

	block_data.size = block->size;
	block_data.data_type = SST_DATA_M;
	block_data.data = (void )block + sizeof(block);

	sst_module_insert_fixed_block(mod, &block_data);

	block = (void )block + sizeof(block) + block->size;
	}
	return 0;
	}

	static int sst_byt_parse_fw_image(struct sst_fw *sst_fw)
	{
	struct fw_header *header;
	struct sst_byt_fw_module_header *module;
	struct sst_dsp *dsp = sst_fw->dsp;
	int ret, count;

	/* Read the header information from the data pointer */
	header = (struct fw_header *)sst_fw->dma_buf;

	/* verify FW */
	if ((strncmp(header->signature, SST_BYT_FW_SIGN, 4) != 0) \|\|
	(sst_fw->size != header->file_size + sizeof(*header))) {
	/* Invalid FW signature */
	dev_err(dsp->dev, "Invalid FW sign/filesize mismatch\n");
	return -EINVAL;
	}

	dev_dbg(dsp->dev,
	"header sign=%4s size=0x%x modules=0x%x fmt=0x%x size=%zu\n",
	header->signature, header->file_size, header->modules,
	header->file_format, sizeof(*header));

	module = (void )sst_fw->dma_buf + sizeof(header);
	for (count = 0; count < header->modules; count++) {
	/* module */
	ret = sst_byt_parse_module(dsp, sst_fw, module);
	if (ret < 0) {
	dev_err(dsp->dev, "invalid module %d\n", count);
	return ret;
	}
	module = (void )module + sizeof(module) + module->mod_size;
	}

	return 0;
	}

	static void sst_byt_dump_shim(struct sst_dsp *sst)
	{
	int i;
	u64 reg;

	for (i = 0; i <= 0xF0; i += 8) {
	reg = sst_dsp_shim_read64_unlocked(sst, i);
	if (reg)
	dev_dbg(sst->dev, "shim 0x%2.2x value 0x%16.16llx\n",
	i, reg);
	}

	for (i = 0x00; i <= 0xff; i += 4) {
	reg = readl(sst->addr.pci_cfg + i);
	if (reg)
	dev_dbg(sst->dev, "pci 0x%2.2x value 0x%8.8x\n",
	i, (u32)reg);
	}
	}

	static irqreturn_t sst_byt_irq(int irq, void *context)
	{
	struct sst_dsp sst = (struct sst_dsp ) context;
	u64 isrx;
	irqreturn_t ret = IRQ_NONE;

	spin_lock(&sst->spinlock);

	isrx = sst_dsp_shim_read64_unlocked(sst, SST_ISRX);
	if (isrx & SST_ISRX_DONE) {
	/* ADSP has processed the message request from IA */
	sst_dsp_shim_update_bits64_unlocked(sst, SST_IPCX,
	SST_BYT_IPCX_DONE, 0);
	ret = IRQ_WAKE_THREAD;
	}
	if (isrx & SST_BYT_ISRX_REQUEST) {
	/* mask message request from ADSP and do processing later */
	sst_dsp_shim_update_bits64_unlocked(sst, SST_IMRX,
	SST_BYT_IMRX_REQUEST,
	SST_BYT_IMRX_REQUEST);
	ret = IRQ_WAKE_THREAD;
	}

	spin_unlock(&sst->spinlock);

	return ret;
	}

	static void sst_byt_boot(struct sst_dsp *sst)
	{
	int tries = 10;

	/* release stall and wait to unstall */
	sst_dsp_shim_update_bits64(sst, SST_CSR, SST_BYT_CSR_STALL, 0x0);
	while (tries--) {
	if (!(sst_dsp_shim_read64(sst, SST_CSR) &
	SST_BYT_CSR_PWAITMODE))
	break;
	msleep(100);
	}
	if (tries < 0) {
	dev_err(sst->dev, "unable to start DSP\n");
	sst_byt_dump_shim(sst);
	}
	}

	static void sst_byt_reset(struct sst_dsp *sst)
	{
	/* put DSP into reset, set reset vector and stall */
	sst_dsp_shim_update_bits64(sst, SST_CSR,
	SST_BYT_CSR_RST \| SST_BYT_CSR_VECTOR_SEL \| SST_BYT_CSR_STALL,
	SST_BYT_CSR_RST \| SST_BYT_CSR_VECTOR_SEL \| SST_BYT_CSR_STALL);

	udelay(10);

	/* take DSP out of reset and keep stalled for FW loading */
	sst_dsp_shim_update_bits64(sst, SST_CSR, SST_BYT_CSR_RST, 0);
	}

	struct sst_adsp_memregion {
	u32 start;
	u32 end;
	int blocks;
	enum sst_mem_type type;
	};

	/* BYT test stuff */
	static const struct sst_adsp_memregion byt_region[] = {
	{0xC0000, 0x100000, 8, SST_MEM_IRAM}, /* I-SRAM - 8 * 32kB */
	{0x100000, 0x140000, 8, SST_MEM_DRAM}, /* D-SRAM0 - 8 * 32kB */
	};

	static int sst_byt_resource_map(struct sst_dsp sst, struct sst_pdata pdata)
	{
	sst->addr.lpe_base = pdata->lpe_base;
	sst->addr.lpe = ioremap(pdata->lpe_base, pdata->lpe_size);
	if (!sst->addr.lpe)
	return -ENODEV;

	/* ADSP PCI MMIO config space */
	sst->addr.pci_cfg = ioremap(pdata->pcicfg_base, pdata->pcicfg_size);
	if (!sst->addr.pci_cfg) {
	iounmap(sst->addr.lpe);
	return -ENODEV;
	}

	/* SST Extended FW allocation */
	sst->addr.fw_ext = ioremap(pdata->fw_base, pdata->fw_size);
	if (!sst->addr.fw_ext) {
	iounmap(sst->addr.pci_cfg);
	iounmap(sst->addr.lpe);
	return -ENODEV;
	}

	/* SST Shim */
	sst->addr.shim = sst->addr.lpe + sst->addr.shim_offset;

	sst_dsp_mailbox_init(sst, SST_BYT_MAILBOX_OFFSET + 0x204,
	SST_BYT_IPC_MAX_PAYLOAD_SIZE,
	SST_BYT_MAILBOX_OFFSET,
	SST_BYT_IPC_MAX_PAYLOAD_SIZE);

	sst->irq = pdata->irq;

	return 0;
	}

	static int sst_byt_init(struct sst_dsp sst, struct sst_pdata pdata)
	{
	const struct sst_adsp_memregion *region;
	struct device *dev;
	int ret = -ENODEV, i, j, region_count;
	u32 offset, size;

	dev = sst->dev;

	switch (sst->id) {
	case SST_DEV_ID_BYT:
	region = byt_region;
	region_count = ARRAY_SIZE(byt_region);
	sst->addr.iram_offset = SST_BYT_IRAM_OFFSET;
	sst->addr.dram_offset = SST_BYT_DRAM_OFFSET;
	sst->addr.shim_offset = SST_BYT_SHIM_OFFSET;
	break;
	default:
	dev_err(dev, "failed to get mem resources\n");
	return ret;
	}

	ret = sst_byt_resource_map(sst, pdata);
	if (ret < 0) {
	dev_err(dev, "failed to map resources\n");
	return ret;
	}

	/*
	* save the physical address of extended firmware block in the first
	* 4 bytes of the mailbox
	*/
	memcpy_toio(sst->addr.lpe + SST_BYT_MAILBOX_OFFSET,
	&pdata->fw_base, sizeof(u32));

	ret = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(32));
	if (ret)
	return ret;

	/* enable Interrupt from both sides */
	sst_dsp_shim_update_bits64(sst, SST_IMRX, 0x3, 0x0);
	sst_dsp_shim_update_bits64(sst, SST_IMRD, 0x3, 0x0);

	/* register DSP memory blocks - ideally we should get this from ACPI */
	for (i = 0; i < region_count; i++) {
	offset = region[i].start;
	size = (region[i].end - region[i].start) / region[i].blocks;

	/* register individual memory blocks */
	for (j = 0; j < region[i].blocks; j++) {
	sst_mem_block_register(sst, offset, size,
	region[i].type, NULL, j, sst);
	offset += size;
	}
	}

	return 0;
	}

	static void sst_byt_free(struct sst_dsp *sst)
	{
	sst_mem_block_unregister_all(sst);
	iounmap(sst->addr.lpe);
	iounmap(sst->addr.pci_cfg);
	iounmap(sst->addr.fw_ext);
	}

	struct sst_ops sst_byt_ops = {
	.reset = sst_byt_reset,
	.boot = sst_byt_boot,
	.write = sst_shim32_write,
	.read = sst_shim32_read,
	.write64 = sst_shim32_write64,
	.read64 = sst_shim32_read64,
	.ram_read = sst_memcpy_fromio_32,
	.ram_write = sst_memcpy_toio_32,
	.irq_handler = sst_byt_irq,
	.init = sst_byt_init,
	.free = sst_byt_free,
	.parse_fw = sst_byt_parse_fw_image,
	};