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 long flags; 17 unsigned int size1, size2; 18 char buffer[256], *pbuffer; 19 20 while (size > 0) { 21 size1 = size > sizeof(buffer) ? sizeof(buffer) : size; 22 if (copy_from_user(buffer, _buffer, size1)) 23 return -EFAULT; 24 if (gus->interwave) { 25 spin_lock_irqsave(&gus->reg_lock, flags); 26 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01); 27 snd_gf1_dram_addr(gus, address); 28 outsb(GUSP(gus, DRAM), buffer, size1); 29 spin_unlock_irqrestore(&gus->reg_lock, flags); 30 address += size1; 31 } else { 32 pbuffer = buffer; 33 size2 = size1; 34 while (size2--) 35 snd_gf1_poke(gus, address++, *pbuffer++); 36 } 37 size -= size1; 38 _buffer += size1; 39 } 40 return 0; 41 } 42 43 44 int snd_gus_dram_write(struct snd_gus_card *gus, char __user *buffer, 45 unsigned int address, unsigned int size) 46 { 47 return snd_gus_dram_poke(gus, buffer, address, size); 48 } 49 50 static int snd_gus_dram_peek(struct snd_gus_card *gus, char __user *_buffer, 51 unsigned int address, unsigned int size, 52 int rom) 53 { 54 unsigned long flags; 55 unsigned int size1, size2; 56 char buffer[256], *pbuffer; 57 58 while (size > 0) { 59 size1 = size > sizeof(buffer) ? sizeof(buffer) : size; 60 if (gus->interwave) { 61 spin_lock_irqsave(&gus->reg_lock, flags); 62 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, rom ? 0x03 : 0x01); 63 snd_gf1_dram_addr(gus, address); 64 insb(GUSP(gus, DRAM), buffer, size1); 65 snd_gf1_write8(gus, SNDRV_GF1_GB_MEMORY_CONTROL, 0x01); 66 spin_unlock_irqrestore(&gus->reg_lock, flags); 67 address += size1; 68 } else { 69 pbuffer = buffer; 70 size2 = size1; 71 while (size2--) 72 *pbuffer++ = snd_gf1_peek(gus, address++); 73 } 74 if (copy_to_user(_buffer, buffer, size1)) 75 return -EFAULT; 76 size -= size1; 77 _buffer += size1; 78 } 79 return 0; 80 } 81 82 int snd_gus_dram_read(struct snd_gus_card *gus, char __user *buffer, 83 unsigned int address, unsigned int size, 84 int rom) 85 { 86 return snd_gus_dram_peek(gus, buffer, address, size, rom); 87 } 88