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
sof_io_write(struct snd_sof_dev * sdev,void __iomem * addr,u32 value)25 void sof_io_write(struct snd_sof_dev *sdev, void __iomem *addr, u32 value)
26 {
27 writel(value, addr);
28 }
29 EXPORT_SYMBOL(sof_io_write);
30
sof_io_read(struct snd_sof_dev * sdev,void __iomem * addr)31 u32 sof_io_read(struct snd_sof_dev *sdev, void __iomem *addr)
32 {
33 return readl(addr);
34 }
35 EXPORT_SYMBOL(sof_io_read);
36
sof_io_write64(struct snd_sof_dev * sdev,void __iomem * addr,u64 value)37 void sof_io_write64(struct snd_sof_dev *sdev, void __iomem *addr, u64 value)
38 {
39 writeq(value, addr);
40 }
41 EXPORT_SYMBOL(sof_io_write64);
42
sof_io_read64(struct snd_sof_dev * sdev,void __iomem * addr)43 u64 sof_io_read64(struct snd_sof_dev *sdev, void __iomem *addr)
44 {
45 return readq(addr);
46 }
47 EXPORT_SYMBOL(sof_io_read64);
48
49 /*
50 * IPC Mailbox IO
51 */
52
sof_mailbox_write(struct snd_sof_dev * sdev,u32 offset,void * message,size_t bytes)53 void 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 }
60 EXPORT_SYMBOL(sof_mailbox_write);
61
sof_mailbox_read(struct snd_sof_dev * sdev,u32 offset,void * message,size_t bytes)62 void 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 }
69 EXPORT_SYMBOL(sof_mailbox_read);
70
71 /*
72 * Memory copy.
73 */
74
sof_block_write(struct snd_sof_dev * sdev,u32 bar,u32 offset,void * src,size_t size)75 void 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 }
104 EXPORT_SYMBOL(sof_block_write);
105
sof_block_read(struct snd_sof_dev * sdev,u32 bar,u32 offset,void * dest,size_t size)106 void 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 }
113 EXPORT_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
snd_sof_create_page_table(struct device * dev,struct snd_dma_buffer * dmab,unsigned char * page_table,size_t size)122 int 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 }
172 EXPORT_SYMBOL(snd_sof_create_page_table);
173