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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file "COPYING" in the main directory of this archive * for more details. * * Low level I/O functions for SNI. */ #include <linux/string.h> #include <asm/mipsconfig.h> #include <asm/addrspace.h> #include <asm/system.h> #include <asm/spinlock.h> #include <asm/sni.h> unsigned char sni_map_isa_cache; #define unused __attribute__((unused)) /* * The PCIMT_CSMAPISA is shared by all processors; we need locking. * * XXX It's legal to use all the I/O memory access functions in interrupt * code, so we need to use the _irq locking stuff which may result in * significant IRQ latencies. */ static spinlock_t csmapisa_lock unused = SPIN_LOCK_UNLOCKED; /* * Urgs... We only can see a 16mb window of the 4gb EISA address space * at PCIMT_EISA_BASE. Maladia segmentitis ... * * XXX Check out if accessing PCIMT_CSMAPISA really is slow. * For now assume so. */ static inline void update_isa_cache(unsigned long address) { unsigned char upper; upper = address >> 24; if (sni_map_isa_cache != upper) { sni_map_isa_cache = upper; *(volatile unsigned char *)PCIMT_CSMAPISA = ~upper; } } static unsigned char sni_readb(unsigned long addr) { unsigned char res; spin_lock_irq(&csmapisa_lock); update_isa_cache(addr); addr &= 0xffffff; res = *(volatile unsigned char *) (PCIMT_EISA_BASE + addr); spin_unlock_irq(&csmapisa_lock); return res; } static unsigned short sni_readw(unsigned long addr) { unsigned short res; spin_lock_irq(&csmapisa_lock); update_isa_cache(addr); addr &= 0xffffff; res = *(volatile unsigned char *) (PCIMT_EISA_BASE + addr); spin_unlock_irq(&csmapisa_lock); return res; } static unsigned int sni_readl(unsigned long addr) { unsigned int res; spin_lock_irq(&csmapisa_lock); update_isa_cache(addr); addr &= 0xffffff; res = *(volatile unsigned char *) (PCIMT_EISA_BASE + addr); spin_unlock_irq(&csmapisa_lock); return res; } static void sni_writeb(unsigned char val, unsigned long addr) { spin_lock_irq(&csmapisa_lock); update_isa_cache(addr); addr &= 0xffffff; *(volatile unsigned char *) (PCIMT_EISA_BASE + addr) = val; spin_unlock_irq(&csmapisa_lock); } static void sni_writew(unsigned short val, unsigned long addr) { spin_lock_irq(&csmapisa_lock); update_isa_cache(addr); addr &= 0xffffff; *(volatile unsigned char *) (PCIMT_EISA_BASE + addr) = val; spin_unlock_irq(&csmapisa_lock); } static void sni_writel(unsigned int val, unsigned long addr) { spin_lock_irq(&csmapisa_lock); update_isa_cache(addr); addr &= 0xffffff; *(volatile unsigned char *) (PCIMT_EISA_BASE + addr) = val; spin_unlock_irq(&csmapisa_lock); } static void sni_memset_io(unsigned long addr, int val, unsigned long len) { unsigned long waddr; waddr = PCIMT_EISA_BASE | (addr & 0xffffff); spin_lock_irq(&csmapisa_lock); while(len) { unsigned long fraglen; fraglen = (~addr + 1) & 0xffffff; fraglen = (fraglen < len) ? fraglen : len; update_isa_cache(addr); memset((char *)waddr, val, fraglen); addr += fraglen; waddr = waddr + fraglen - 0x1000000; len -= fraglen; } spin_unlock_irq(&csmapisa_lock); } static void sni_memcpy_fromio(unsigned long to, unsigned long from, unsigned long len) { unsigned long waddr; waddr = PCIMT_EISA_BASE | (from & 0xffffff); spin_lock_irq(&csmapisa_lock); while(len) { unsigned long fraglen; fraglen = (~from + 1) & 0xffffff; fraglen = (fraglen < len) ? fraglen : len; update_isa_cache(from); memcpy((void *)to, (void *)waddr, fraglen); to += fraglen; from += fraglen; waddr = waddr + fraglen - 0x1000000; len -= fraglen; } spin_unlock_irq(&csmapisa_lock); } static void sni_memcpy_toio(unsigned long to, unsigned long from, unsigned long len) { unsigned long waddr; waddr = PCIMT_EISA_BASE | (to & 0xffffff); spin_lock_irq(&csmapisa_lock); while(len) { unsigned long fraglen; fraglen = (~to + 1) & 0xffffff; fraglen = (fraglen < len) ? fraglen : len; update_isa_cache(to); memcpy((char *)to + PCIMT_EISA_BASE, (void *)from, fraglen); to += fraglen; from += fraglen; waddr = waddr + fraglen - 0x1000000; len -= fraglen; } spin_unlock_irq(&csmapisa_lock); } |