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 void __iomem *ptr = (void __iomem *)addr; 79 return intc_get_field_from_handle(__raw_readb(ptr), h); 80 } 81 82 static unsigned long test_16(unsigned long addr, unsigned long h, 83 unsigned long ignore) 84 { 85 void __iomem *ptr = (void __iomem *)addr; 86 return intc_get_field_from_handle(__raw_readw(ptr), h); 87 } 88 89 static unsigned long test_32(unsigned long addr, unsigned long h, 90 unsigned long ignore) 91 { 92 void __iomem *ptr = (void __iomem *)addr; 93 return intc_get_field_from_handle(__raw_readl(ptr), h); 94 } 95 96 static unsigned long write_8(unsigned long addr, unsigned long h, 97 unsigned long data) 98 { 99 void __iomem *ptr = (void __iomem *)addr; 100 __raw_writeb(intc_set_field_from_handle(0, data, h), ptr); 101 (void)__raw_readb(ptr); /* Defeat write posting */ 102 return 0; 103 } 104 105 static unsigned long write_16(unsigned long addr, unsigned long h, 106 unsigned long data) 107 { 108 void __iomem *ptr = (void __iomem *)addr; 109 __raw_writew(intc_set_field_from_handle(0, data, h), ptr); 110 (void)__raw_readw(ptr); /* Defeat write posting */ 111 return 0; 112 } 113 114 static unsigned long write_32(unsigned long addr, unsigned long h, 115 unsigned long data) 116 { 117 void __iomem *ptr = (void __iomem *)addr; 118 __raw_writel(intc_set_field_from_handle(0, data, h), ptr); 119 (void)__raw_readl(ptr); /* Defeat write posting */ 120 return 0; 121 } 122 123 static unsigned long modify_8(unsigned long addr, unsigned long h, 124 unsigned long data) 125 { 126 void __iomem *ptr = (void __iomem *)addr; 127 unsigned long flags; 128 unsigned int value; 129 local_irq_save(flags); 130 value = intc_set_field_from_handle(__raw_readb(ptr), data, h); 131 __raw_writeb(value, ptr); 132 (void)__raw_readb(ptr); /* Defeat write posting */ 133 local_irq_restore(flags); 134 return 0; 135 } 136 137 static unsigned long modify_16(unsigned long addr, unsigned long h, 138 unsigned long data) 139 { 140 void __iomem *ptr = (void __iomem *)addr; 141 unsigned long flags; 142 unsigned int value; 143 local_irq_save(flags); 144 value = intc_set_field_from_handle(__raw_readw(ptr), data, h); 145 __raw_writew(value, ptr); 146 (void)__raw_readw(ptr); /* Defeat write posting */ 147 local_irq_restore(flags); 148 return 0; 149 } 150 151 static unsigned long modify_32(unsigned long addr, unsigned long h, 152 unsigned long data) 153 { 154 void __iomem *ptr = (void __iomem *)addr; 155 unsigned long flags; 156 unsigned int value; 157 local_irq_save(flags); 158 value = intc_set_field_from_handle(__raw_readl(ptr), data, h); 159 __raw_writel(value, ptr); 160 (void)__raw_readl(ptr); /* Defeat write posting */ 161 local_irq_restore(flags); 162 return 0; 163 } 164 165 static unsigned long intc_mode_field(unsigned long addr, 166 unsigned long handle, 167 unsigned long (*fn)(unsigned long, 168 unsigned long, 169 unsigned long), 170 unsigned int irq) 171 { 172 return fn(addr, handle, ((1 << _INTC_WIDTH(handle)) - 1)); 173 } 174 175 static unsigned long intc_mode_zero(unsigned long addr, 176 unsigned long handle, 177 unsigned long (*fn)(unsigned long, 178 unsigned long, 179 unsigned long), 180 unsigned int irq) 181 { 182 return fn(addr, handle, 0); 183 } 184 185 static unsigned long intc_mode_prio(unsigned long addr, 186 unsigned long handle, 187 unsigned long (*fn)(unsigned long, 188 unsigned long, 189 unsigned long), 190 unsigned int irq) 191 { 192 return fn(addr, handle, intc_get_prio_level(irq)); 193 } 194 195 unsigned long (*intc_reg_fns[])(unsigned long addr, 196 unsigned long h, 197 unsigned long data) = { 198 [REG_FN_TEST_BASE + 0] = test_8, 199 [REG_FN_TEST_BASE + 1] = test_16, 200 [REG_FN_TEST_BASE + 3] = test_32, 201 [REG_FN_WRITE_BASE + 0] = write_8, 202 [REG_FN_WRITE_BASE + 1] = write_16, 203 [REG_FN_WRITE_BASE + 3] = write_32, 204 [REG_FN_MODIFY_BASE + 0] = modify_8, 205 [REG_FN_MODIFY_BASE + 1] = modify_16, 206 [REG_FN_MODIFY_BASE + 3] = modify_32, 207 }; 208 209 unsigned long (*intc_enable_fns[])(unsigned long addr, 210 unsigned long handle, 211 unsigned long (*fn)(unsigned long, 212 unsigned long, 213 unsigned long), 214 unsigned int irq) = { 215 [MODE_ENABLE_REG] = intc_mode_field, 216 [MODE_MASK_REG] = intc_mode_zero, 217 [MODE_DUAL_REG] = intc_mode_field, 218 [MODE_PRIO_REG] = intc_mode_prio, 219 [MODE_PCLR_REG] = intc_mode_prio, 220 }; 221 222 unsigned long (*intc_disable_fns[])(unsigned long addr, 223 unsigned long handle, 224 unsigned long (*fn)(unsigned long, 225 unsigned long, 226 unsigned long), 227 unsigned int irq) = { 228 [MODE_ENABLE_REG] = intc_mode_zero, 229 [MODE_MASK_REG] = intc_mode_field, 230 [MODE_DUAL_REG] = intc_mode_field, 231 [MODE_PRIO_REG] = intc_mode_zero, 232 [MODE_PCLR_REG] = intc_mode_field, 233 }; 234 235 unsigned long (*intc_enable_noprio_fns[])(unsigned long addr, 236 unsigned long handle, 237 unsigned long (*fn)(unsigned long, 238 unsigned long, 239 unsigned long), 240 unsigned int irq) = { 241 [MODE_ENABLE_REG] = intc_mode_field, 242 [MODE_MASK_REG] = intc_mode_zero, 243 [MODE_DUAL_REG] = intc_mode_field, 244 [MODE_PRIO_REG] = intc_mode_field, 245 [MODE_PCLR_REG] = intc_mode_field, 246 }; 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