1 /* 2 * Common INTC2 register accessors 3 * 4 * Copyright (C) 2007, 2008 Magnus Damm 5 * Copyright (C) 2009, 2010 Paul Mundt 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file "COPYING" in the main directory of this archive 9 * for more details. 10 */ 11 #include <linux/io.h> 12 #include "internals.h" 13 14 unsigned long intc_phys_to_virt(struct intc_desc_int *d, unsigned long address) 15 { 16 struct intc_window *window; 17 int k; 18 19 /* scan through physical windows and convert address */ 20 for (k = 0; k < d->nr_windows; k++) { 21 window = d->window + k; 22 23 if (address < window->phys) 24 continue; 25 26 if (address >= (window->phys + window->size)) 27 continue; 28 29 address -= window->phys; 30 address += (unsigned long)window->virt; 31 32 return address; 33 } 34 35 /* no windows defined, register must be 1:1 mapped virt:phys */ 36 return address; 37 } 38 39 unsigned int intc_get_reg(struct intc_desc_int *d, unsigned long address) 40 { 41 unsigned int k; 42 43 address = intc_phys_to_virt(d, address); 44 45 for (k = 0; k < d->nr_reg; k++) { 46 if (d->reg[k] == address) 47 return k; 48 } 49 50 BUG(); 51 return 0; 52 } 53 54 unsigned int intc_set_field_from_handle(unsigned int value, 55 unsigned int field_value, 56 unsigned int handle) 57 { 58 unsigned int width = _INTC_WIDTH(handle); 59 unsigned int shift = _INTC_SHIFT(handle); 60 61 value &= ~(((1 << width) - 1) << shift); 62 value |= field_value << shift; 63 return value; 64 } 65 66 unsigned long intc_get_field_from_handle(unsigned int value, unsigned int handle) 67 { 68 unsigned int width = _INTC_WIDTH(handle); 69 unsigned int shift = _INTC_SHIFT(handle); 70 unsigned int mask = ((1 << width) - 1) << shift; 71 72 return (value & mask) >> shift; 73 } 74 75 static unsigned long test_8(unsigned long addr, unsigned long h, 76 unsigned long ignore) 77 { 78 return intc_get_field_from_handle(__raw_readb(addr), h); 79 } 80 81 static unsigned long test_16(unsigned long addr, unsigned long h, 82 unsigned long ignore) 83 { 84 return intc_get_field_from_handle(__raw_readw(addr), h); 85 } 86 87 static unsigned long test_32(unsigned long addr, unsigned long h, 88 unsigned long ignore) 89 { 90 return intc_get_field_from_handle(__raw_readl(addr), h); 91 } 92 93 static unsigned long write_8(unsigned long addr, unsigned long h, 94 unsigned long data) 95 { 96 __raw_writeb(intc_set_field_from_handle(0, data, h), addr); 97 (void)__raw_readb(addr); /* Defeat write posting */ 98 return 0; 99 } 100 101 static unsigned long write_16(unsigned long addr, unsigned long h, 102 unsigned long data) 103 { 104 __raw_writew(intc_set_field_from_handle(0, data, h), addr); 105 (void)__raw_readw(addr); /* Defeat write posting */ 106 return 0; 107 } 108 109 static unsigned long write_32(unsigned long addr, unsigned long h, 110 unsigned long data) 111 { 112 __raw_writel(intc_set_field_from_handle(0, data, h), addr); 113 (void)__raw_readl(addr); /* Defeat write posting */ 114 return 0; 115 } 116 117 static unsigned long modify_8(unsigned long addr, unsigned long h, 118 unsigned long data) 119 { 120 unsigned long flags; 121 unsigned int value; 122 local_irq_save(flags); 123 value = intc_set_field_from_handle(__raw_readb(addr), data, h); 124 __raw_writeb(value, addr); 125 (void)__raw_readb(addr); /* Defeat write posting */ 126 local_irq_restore(flags); 127 return 0; 128 } 129 130 static unsigned long modify_16(unsigned long addr, unsigned long h, 131 unsigned long data) 132 { 133 unsigned long flags; 134 unsigned int value; 135 local_irq_save(flags); 136 value = intc_set_field_from_handle(__raw_readw(addr), data, h); 137 __raw_writew(value, addr); 138 (void)__raw_readw(addr); /* Defeat write posting */ 139 local_irq_restore(flags); 140 return 0; 141 } 142 143 static unsigned long modify_32(unsigned long addr, unsigned long h, 144 unsigned long data) 145 { 146 unsigned long flags; 147 unsigned int value; 148 local_irq_save(flags); 149 value = intc_set_field_from_handle(__raw_readl(addr), data, h); 150 __raw_writel(value, addr); 151 (void)__raw_readl(addr); /* Defeat write posting */ 152 local_irq_restore(flags); 153 return 0; 154 } 155 156 static unsigned long intc_mode_field(unsigned long addr, 157 unsigned long handle, 158 unsigned long (*fn)(unsigned long, 159 unsigned long, 160 unsigned long), 161 unsigned int irq) 162 { 163 return fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1)); 164 } 165 166 static unsigned long intc_mode_zero(unsigned long addr, 167 unsigned long handle, 168 unsigned long (*fn)(unsigned long, 169 unsigned long, 170 unsigned long), 171 unsigned int irq) 172 { 173 return fn(addr, handle, 0); 174 } 175 176 static unsigned long intc_mode_prio(unsigned long addr, 177 unsigned long handle, 178 unsigned long (*fn)(unsigned long, 179 unsigned long, 180 unsigned long), 181 unsigned int irq) 182 { 183 return fn(addr, handle, intc_get_prio_level(irq)); 184 } 185 186 unsigned long (*intc_reg_fns[])(unsigned long addr, 187 unsigned long h, 188 unsigned long data) = { 189 [REG_FN_TEST_BASE + 0] = test_8, 190 [REG_FN_TEST_BASE + 1] = test_16, 191 [REG_FN_TEST_BASE + 3] = test_32, 192 [REG_FN_WRITE_BASE + 0] = write_8, 193 [REG_FN_WRITE_BASE + 1] = write_16, 194 [REG_FN_WRITE_BASE + 3] = write_32, 195 [REG_FN_MODIFY_BASE + 0] = modify_8, 196 [REG_FN_MODIFY_BASE + 1] = modify_16, 197 [REG_FN_MODIFY_BASE + 3] = modify_32, 198 }; 199 200 unsigned long (*intc_enable_fns[])(unsigned long addr, 201 unsigned long handle, 202 unsigned long (*fn)(unsigned long, 203 unsigned long, 204 unsigned long), 205 unsigned int irq) = { 206 [MODE_ENABLE_REG] = intc_mode_field, 207 [MODE_MASK_REG] = intc_mode_zero, 208 [MODE_DUAL_REG] = intc_mode_field, 209 [MODE_PRIO_REG] = intc_mode_prio, 210 [MODE_PCLR_REG] = intc_mode_prio, 211 }; 212 213 unsigned long (*intc_disable_fns[])(unsigned long addr, 214 unsigned long handle, 215 unsigned long (*fn)(unsigned long, 216 unsigned long, 217 unsigned long), 218 unsigned int irq) = { 219 [MODE_ENABLE_REG] = intc_mode_zero, 220 [MODE_MASK_REG] = intc_mode_field, 221 [MODE_DUAL_REG] = intc_mode_field, 222 [MODE_PRIO_REG] = intc_mode_zero, 223 [MODE_PCLR_REG] = intc_mode_field, 224 }; 225 226 unsigned long (*intc_enable_noprio_fns[])(unsigned long addr, 227 unsigned long handle, 228 unsigned long (*fn)(unsigned long, 229 unsigned long, 230 unsigned long), 231 unsigned int irq) = { 232 [MODE_ENABLE_REG] = intc_mode_field, 233 [MODE_MASK_REG] = intc_mode_zero, 234 [MODE_DUAL_REG] = intc_mode_field, 235 [MODE_PRIO_REG] = intc_mode_field, 236 [MODE_PCLR_REG] = intc_mode_field, 237 }; 238