sound/soc/sof/utils.c

   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
  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
  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
  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
  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
  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
  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
  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
 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
 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);