1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz> 4 * DRAM access routines 5 */ 6 7 #include <linux/time.h> 8 #include <sound/core.h> 9 #include <sound/gus.h> 10 #include <sound/info.h> 11 12 13 static int snd_gus_dram_poke(struct snd_gus_card *gus, char __user *_buffer, 14 unsigned int address, unsigned int size) 15 { 16 unsigned int size1, size2; 17 char buffer[256], *pbuffer; 18 19 while (size > 0) { 20 size1 = size > sizeof(buffer) ? sizeof(buffer) : size; 21 if (copy_from_user(buffer, _buffer, size1)) 22 return -EFAULT; 23 if (gus->interwave) { 24 guard(spinlock_irqsave)(&gus->reg_lock); 25 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01); 26 snd_gf1_dram_addr(gus, address); 27 outsb(GUSP(gus, DRAM), buffer, size1); 28 address += size1; 29 } else { 30 pbuffer = buffer; 31 size2 = size1; 32 while (size2--) 33 snd_gf1_poke(gus, address++, *pbuffer++); 34 } 35 size -= size1; 36 _buffer += size1; 37 } 38 return 0; 39 } 40 41 42 int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer, 43 unsigned int address, unsigned int size) 44 { 45 return snd_gus_dram_poke(gus, buffer, address, size); 46 } 47 48 static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer, 49 unsigned int address, unsigned int size, 50 int rom) 51 { 52 unsigned int size1, size2; 53 char buffer[256], *pbuffer; 54 55 while (size > 0) { 56 size1 = size > sizeof(buffer) ? sizeof(buffer) : size; 57 if (gus->interwave) { 58 guard(spinlock_irqsave)(&gus->reg_lock); 59 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01); 60 snd_gf1_dram_addr(gus, address); 61 insb(GUSP(gus, DRAM), buffer, size1); 62 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01); 63 address += size1; 64 } else { 65 pbuffer = buffer; 66 size2 = size1; 67 while (size2--) 68 *pbuffer++ = snd_gf1_peek(gus, address++); 69 } 70 if (copy_to_user(_buffer, buffer, size1)) 71 return -EFAULT; 72 size -= size1; 73 _buffer += size1; 74 } 75 return 0; 76 } 77 78 int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer, 79 unsigned int address, unsigned int size, 80 int rom) 81 { 82 return snd_gus_dram_peek(gus, buffer, address, size, rom); 83 } 84