tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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#include "ops.h"
18
19/*
20 * Register IO
21 *
22 * The sof_io_xyz() wrappers are typically referenced in snd_sof_dsp_ops
23 * structures and cannot be inlined.
24 */
25
26void sof_io_write(struct snd_sof_dev *sdev, void __iomem *addr, u32 value)
27{
28 writel(value, addr);
29}
30EXPORT_SYMBOL(sof_io_write);
31
32u32 sof_io_read(struct snd_sof_dev *sdev, void __iomem *addr)
33{
34 return readl(addr);
35}
36EXPORT_SYMBOL(sof_io_read);
37
38void sof_io_write64(struct snd_sof_dev *sdev, void __iomem *addr, u64 value)
39{
40 writeq(value, addr);
41}
42EXPORT_SYMBOL(sof_io_write64);
43
44u64 sof_io_read64(struct snd_sof_dev *sdev, void __iomem *addr)
45{
46 return readq(addr);
47}
48EXPORT_SYMBOL(sof_io_read64);
49
50/*
51 * IPC Mailbox IO
52 */
53
54void sof_mailbox_write(struct snd_sof_dev *sdev, u32 offset,
55 void *message, size_t bytes)
56{
57 void __iomem *dest = sdev->bar[sdev->mailbox_bar] + offset;
58
59 memcpy_toio(dest, message, bytes);
60}
61EXPORT_SYMBOL(sof_mailbox_write);
62
63void sof_mailbox_read(struct snd_sof_dev *sdev, u32 offset,
64 void *message, size_t bytes)
65{
66 void __iomem *src = sdev->bar[sdev->mailbox_bar] + offset;
67
68 memcpy_fromio(message, src, bytes);
69}
70EXPORT_SYMBOL(sof_mailbox_read);
71
72/*
73 * Memory copy.
74 */
75
76int sof_block_write(struct snd_sof_dev *sdev, enum snd_sof_fw_blk_type blk_type,
77 u32 offset, void *src, size_t size)
78{
79 int bar = snd_sof_dsp_get_bar_index(sdev, blk_type);
80 const u8 *src_byte = src;
81 void __iomem *dest;
82 u32 affected_mask;
83 u32 tmp;
84 int m, n;
85
86 if (bar < 0)
87 return bar;
88
89 dest = sdev->bar[bar] + offset;
90
91 m = size / 4;
92 n = size % 4;
93
94 /* __iowrite32_copy use 32bit size values so divide by 4 */
95 __iowrite32_copy(dest, src, m);
96
97 if (n) {
98 affected_mask = (1 << (8 * n)) - 1;
99
100 /* first read the 32bit data of dest, then change affected
101 * bytes, and write back to dest. For unaffected bytes, it
102 * should not be changed
103 */
104 tmp = ioread32(dest + m * 4);
105 tmp &= ~affected_mask;
106
107 tmp |= *(u32 *)(src_byte + m * 4) & affected_mask;
108 iowrite32(tmp, dest + m * 4);
109 }
110
111 return 0;
112}
113EXPORT_SYMBOL(sof_block_write);
114
115int sof_block_read(struct snd_sof_dev *sdev, enum snd_sof_fw_blk_type blk_type,
116 u32 offset, void *dest, size_t size)
117{
118 int bar = snd_sof_dsp_get_bar_index(sdev, blk_type);
119
120 if (bar < 0)
121 return bar;
122
123 memcpy_fromio(dest, sdev->bar[bar] + offset, size);
124
125 return 0;
126}
127EXPORT_SYMBOL(sof_block_read);
128
129/*
130 * Generic buffer page table creation.
131 * Take the each physical page address and drop the least significant unused
132 * bits from each (based on PAGE_SIZE). Then pack valid page address bits
133 * into compressed page table.
134 */
135
136int snd_sof_create_page_table(struct device *dev,
137 struct snd_dma_buffer *dmab,
138 unsigned char *page_table, size_t size)
139{
140 int i, pages;
141
142 pages = snd_sgbuf_aligned_pages(size);
143
144 dev_dbg(dev, "generating page table for %p size 0x%zx pages %d\n",
145 dmab->area, size, pages);
146
147 for (i = 0; i < pages; i++) {
148 /*
149 * The number of valid address bits for each page is 20.
150 * idx determines the byte position within page_table
151 * where the current page's address is stored
152 * in the compressed page_table.
153 * This can be calculated by multiplying the page number by 2.5.
154 */
155 u32 idx = (5 * i) >> 1;
156 u32 pfn = snd_sgbuf_get_addr(dmab, i * PAGE_SIZE) >> PAGE_SHIFT;
157 u8 *pg_table;
158
159 dev_vdbg(dev, "pfn i %i idx %d pfn %x\n", i, idx, pfn);
160
161 pg_table = (u8 *)(page_table + idx);
162
163 /*
164 * pagetable compression:
165 * byte 0 byte 1 byte 2 byte 3 byte 4 byte 5
166 * ___________pfn 0__________ __________pfn 1___________ _pfn 2...
167 * .... .... .... .... .... .... .... .... .... .... ....
168 * It is created by:
169 * 1. set current location to 0, PFN index i to 0
170 * 2. put pfn[i] at current location in Little Endian byte order
171 * 3. calculate an intermediate value as
172 * x = (pfn[i+1] << 4) | (pfn[i] & 0xf)
173 * 4. put x at offset (current location + 2) in LE byte order
174 * 5. increment current location by 5 bytes, increment i by 2
175 * 6. continue to (2)
176 */
177 if (i & 1)
178 put_unaligned_le32((pg_table[0] & 0xf) | pfn << 4,
179 pg_table);
180 else
181 put_unaligned_le32(pfn, pg_table);
182 }
183
184 return pages;
185}
186EXPORT_SYMBOL(snd_sof_create_page_table);