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Note: File does not exist in v6.2.
  1// SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
  2//
  3// This file is provided under a dual BSD/GPLv2 license.  When using or
  4// redistributing this file, you may do so under either license.
  5//
  6// Copyright(c) 2018 Intel Corporation. All rights reserved.
  7//
  8// Author: Keyon Jie <yang.jie@linux.intel.com>
  9//
 10
 11#include <linux/io-64-nonatomic-lo-hi.h>
 12#include <linux/platform_device.h>
 13#include <asm/unaligned.h>
 14#include <sound/soc.h>
 15#include <sound/sof.h>
 16#include "sof-priv.h"
 17
 18/*
 19 * Register IO
 20 *
 21 * The sof_io_xyz() wrappers are typically referenced in snd_sof_dsp_ops
 22 * structures and cannot be inlined.
 23 */
 24
 25void sof_io_write(struct snd_sof_dev *sdev, void __iomem *addr, u32 value)
 26{
 27	writel(value, addr);
 28}
 29EXPORT_SYMBOL(sof_io_write);
 30
 31u32 sof_io_read(struct snd_sof_dev *sdev, void __iomem *addr)
 32{
 33	return readl(addr);
 34}
 35EXPORT_SYMBOL(sof_io_read);
 36
 37void sof_io_write64(struct snd_sof_dev *sdev, void __iomem *addr, u64 value)
 38{
 39	writeq(value, addr);
 40}
 41EXPORT_SYMBOL(sof_io_write64);
 42
 43u64 sof_io_read64(struct snd_sof_dev *sdev, void __iomem *addr)
 44{
 45	return readq(addr);
 46}
 47EXPORT_SYMBOL(sof_io_read64);
 48
 49/*
 50 * IPC Mailbox IO
 51 */
 52
 53void sof_mailbox_write(struct snd_sof_dev *sdev, u32 offset,
 54		       void *message, size_t bytes)
 55{
 56	void __iomem *dest = sdev->bar[sdev->mailbox_bar] + offset;
 57
 58	memcpy_toio(dest, message, bytes);
 59}
 60EXPORT_SYMBOL(sof_mailbox_write);
 61
 62void sof_mailbox_read(struct snd_sof_dev *sdev, u32 offset,
 63		      void *message, size_t bytes)
 64{
 65	void __iomem *src = sdev->bar[sdev->mailbox_bar] + offset;
 66
 67	memcpy_fromio(message, src, bytes);
 68}
 69EXPORT_SYMBOL(sof_mailbox_read);
 70
 71/*
 72 * Memory copy.
 73 */
 74
 75void sof_block_write(struct snd_sof_dev *sdev, u32 bar, u32 offset, void *src,
 76		     size_t size)
 77{
 78	void __iomem *dest = sdev->bar[bar] + offset;
 79	const u8 *src_byte = src;
 80	u32 affected_mask;
 81	u32 tmp;
 82	int m, n;
 83
 84	m = size / 4;
 85	n = size % 4;
 86
 87	/* __iowrite32_copy use 32bit size values so divide by 4 */
 88	__iowrite32_copy(dest, src, m);
 89
 90	if (n) {
 91		affected_mask = (1 << (8 * n)) - 1;
 92
 93		/* first read the 32bit data of dest, then change affected
 94		 * bytes, and write back to dest. For unaffected bytes, it
 95		 * should not be changed
 96		 */
 97		tmp = ioread32(dest + m * 4);
 98		tmp &= ~affected_mask;
 99
100		tmp |= *(u32 *)(src_byte + m * 4) & affected_mask;
101		iowrite32(tmp, dest + m * 4);
102	}
103}
104EXPORT_SYMBOL(sof_block_write);
105
106void sof_block_read(struct snd_sof_dev *sdev, u32 bar, u32 offset, void *dest,
107		    size_t size)
108{
109	void __iomem *src = sdev->bar[bar] + offset;
110
111	memcpy_fromio(dest, src, size);
112}
113EXPORT_SYMBOL(sof_block_read);
114
115/*
116 * Generic buffer page table creation.
117 * Take the each physical page address and drop the least significant unused
118 * bits from each (based on PAGE_SIZE). Then pack valid page address bits
119 * into compressed page table.
120 */
121
122int snd_sof_create_page_table(struct device *dev,
123			      struct snd_dma_buffer *dmab,
124			      unsigned char *page_table, size_t size)
125{
126	int i, pages;
127
128	pages = snd_sgbuf_aligned_pages(size);
129
130	dev_dbg(dev, "generating page table for %p size 0x%zx pages %d\n",
131		dmab->area, size, pages);
132
133	for (i = 0; i < pages; i++) {
134		/*
135		 * The number of valid address bits for each page is 20.
136		 * idx determines the byte position within page_table
137		 * where the current page's address is stored
138		 * in the compressed page_table.
139		 * This can be calculated by multiplying the page number by 2.5.
140		 */
141		u32 idx = (5 * i) >> 1;
142		u32 pfn = snd_sgbuf_get_addr(dmab, i * PAGE_SIZE) >> PAGE_SHIFT;
143		u8 *pg_table;
144
145		dev_vdbg(dev, "pfn i %i idx %d pfn %x\n", i, idx, pfn);
146
147		pg_table = (u8 *)(page_table + idx);
148
149		/*
150		 * pagetable compression:
151		 * byte 0     byte 1     byte 2     byte 3     byte 4     byte 5
152		 * ___________pfn 0__________ __________pfn 1___________  _pfn 2...
153		 * .... ....  .... ....  .... ....  .... ....  .... ....  ....
154		 * It is created by:
155		 * 1. set current location to 0, PFN index i to 0
156		 * 2. put pfn[i] at current location in Little Endian byte order
157		 * 3. calculate an intermediate value as
158		 *    x = (pfn[i+1] << 4) | (pfn[i] & 0xf)
159		 * 4. put x at offset (current location + 2) in LE byte order
160		 * 5. increment current location by 5 bytes, increment i by 2
161		 * 6. continue to (2)
162		 */
163		if (i & 1)
164			put_unaligned_le32((pg_table[0] & 0xf) | pfn << 4,
165					   pg_table);
166		else
167			put_unaligned_le32(pfn, pg_table);
168	}
169
170	return pages;
171}
172EXPORT_SYMBOL(snd_sof_create_page_table);