drivers/sh/intc/chip.c

   1 /*
   2  * IRQ chip definitions for INTC IRQs.
   3  *
   4  * Copyright (C) 2007, 2008 Magnus Damm
   5  * Copyright (C) 2009 - 2012 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/cpumask.h>
  12 #include <linux/bsearch.h>
  13 #include <linux/io.h>
  14 #include "internals.h"
  15
  16 void _intc_enable(struct irq_data *data, unsigned long handle)
  17 {
  18         unsigned int irq = data->irq;
  19         struct intc_desc_int *d = get_intc_desc(irq);
  20         unsigned long addr;
  21         unsigned int cpu;
  22
  23         for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) {
  24 #ifdef CONFIG_SMP
  25                 if (!cpumask_test_cpu(cpu, irq_data_get_affinity_mask(data)))
  26                         continue;
  27 #endif
  28                 addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu);
  29                 intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\
  30                                                     [_INTC_FN(handle)], irq);
  31         }
  32
  33         intc_balancing_enable(irq);
  34 }
  35
  36 static void intc_enable(struct irq_data *data)
  37 {
  38         _intc_enable(data, (unsigned long)irq_data_get_irq_chip_data(data));
  39 }
  40
  41 static void intc_disable(struct irq_data *data)
  42 {
  43         unsigned int irq = data->irq;
  44         struct intc_desc_int *d = get_intc_desc(irq);
  45         unsigned long handle = (unsigned long)irq_data_get_irq_chip_data(data);
  46         unsigned long addr;
  47         unsigned int cpu;
  48
  49         intc_balancing_disable(irq);
  50
  51         for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) {
  52 #ifdef CONFIG_SMP
  53                 if (!cpumask_test_cpu(cpu, irq_data_get_affinity_mask(data)))
  54                         continue;
  55 #endif
  56                 addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu);
  57                 intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\
  58                                                      [_INTC_FN(handle)], irq);
  59         }
  60 }
  61
  62 #ifdef CONFIG_SMP
  63 /*
  64  * This is held with the irq desc lock held, so we don't require any
  65  * additional locking here at the intc desc level. The affinity mask is
  66  * later tested in the enable/disable paths.
  67  */
  68 static int intc_set_affinity(struct irq_data *data,
  69                              const struct cpumask *cpumask,
  70                              bool force)
  71 {
  72         if (!cpumask_intersects(cpumask, cpu_online_mask))
  73                 return -1;
  74
  75         cpumask_copy(irq_data_get_affinity_mask(data), cpumask);
  76
  77         return IRQ_SET_MASK_OK_NOCOPY;
  78 }
  79 #endif
  80
  81 static void intc_mask_ack(struct irq_data *data)
  82 {
  83         unsigned int irq = data->irq;
  84         struct intc_desc_int *d = get_intc_desc(irq);
  85         unsigned long handle = intc_get_ack_handle(irq);
  86         void __iomem *addr;
  87
  88         intc_disable(data);
  89
  90         /* read register and write zero only to the associated bit */
  91         if (handle) {
  92                 unsigned int value;
  93
  94                 addr = (void __iomem *)INTC_REG(d, _INTC_ADDR_D(handle), 0);
  95                 value = intc_set_field_from_handle(0, 1, handle);
  96
  97                 switch (_INTC_FN(handle)) {
  98                 case REG_FN_MODIFY_BASE + 0:    /* 8bit */
  99                         __raw_readb(addr);
 100                         __raw_writeb(0xff ^ value, addr);
 101                         break;
 102                 case REG_FN_MODIFY_BASE + 1:    /* 16bit */
 103                         __raw_readw(addr);
 104                         __raw_writew(0xffff ^ value, addr);
 105                         break;
 106                 case REG_FN_MODIFY_BASE + 3:    /* 32bit */
 107                         __raw_readl(addr);
 108                         __raw_writel(0xffffffff ^ value, addr);
 109                         break;
 110                 default:
 111                         BUG();
 112                         break;
 113                 }
 114         }
 115 }
 116
 117 static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp,
 118                                              unsigned int nr_hp,
 119                                              unsigned int irq)
 120 {
 121         struct intc_handle_int key;
 122
 123         key.irq = irq;
 124         key.handle = 0;
 125
 126         return bsearch(&key, hp, nr_hp, sizeof(*hp), intc_handle_int_cmp);
 127 }
 128
 129 int intc_set_priority(unsigned int irq, unsigned int prio)
 130 {
 131         struct intc_desc_int *d = get_intc_desc(irq);
 132         struct irq_data *data = irq_get_irq_data(irq);
 133         struct intc_handle_int *ihp;
 134
 135         if (!intc_get_prio_level(irq) || prio <= 1)
 136                 return -EINVAL;
 137
 138         ihp = intc_find_irq(d->prio, d->nr_prio, irq);
 139         if (ihp) {
 140                 if (prio >= (1 << _INTC_WIDTH(ihp->handle)))
 141                         return -EINVAL;
 142
 143                 intc_set_prio_level(irq, prio);
 144
 145                 /*
 146                  * only set secondary masking method directly
 147                  * primary masking method is using intc_prio_level[irq]
 148                  * priority level will be set during next enable()
 149                  */
 150                 if (_INTC_FN(ihp->handle) != REG_FN_ERR)
 151                         _intc_enable(data, ihp->handle);
 152         }
 153         return 0;
 154 }
 155
 156 #define SENSE_VALID_FLAG 0x80
 157 #define VALID(x) (x | SENSE_VALID_FLAG)
 158
 159 static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = {
 160         [IRQ_TYPE_EDGE_FALLING] = VALID(0),
 161         [IRQ_TYPE_EDGE_RISING] = VALID(1),
 162         [IRQ_TYPE_LEVEL_LOW] = VALID(2),
 163         /* SH7706, SH7707 and SH7709 do not support high level triggered */
 164 #if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \
 165     !defined(CONFIG_CPU_SUBTYPE_SH7707) && \
 166     !defined(CONFIG_CPU_SUBTYPE_SH7709)
 167         [IRQ_TYPE_LEVEL_HIGH] = VALID(3),
 168 #endif
 169 #if defined(CONFIG_ARM) /* all recent SH-Mobile / R-Mobile ARM support this */
 170         [IRQ_TYPE_EDGE_BOTH] = VALID(4),
 171 #endif
 172 };
 173
 174 static int intc_set_type(struct irq_data *data, unsigned int type)
 175 {
 176         unsigned int irq = data->irq;
 177         struct intc_desc_int *d = get_intc_desc(irq);
 178         unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK];
 179         struct intc_handle_int *ihp;
 180         unsigned long addr;
 181
 182         if (!value)
 183                 return -EINVAL;
 184
 185         value &= ~SENSE_VALID_FLAG;
 186
 187         ihp = intc_find_irq(d->sense, d->nr_sense, irq);
 188         if (ihp) {
 189                 /* PINT has 2-bit sense registers, should fail on EDGE_BOTH */
 190                 if (value >= (1 << _INTC_WIDTH(ihp->handle)))
 191                         return -EINVAL;
 192
 193                 addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0);
 194                 intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle, value);
 195         }
 196
 197         return 0;
 198 }
 199
 200 struct irq_chip intc_irq_chip   = {
 201         .irq_mask               = intc_disable,
 202         .irq_unmask             = intc_enable,
 203         .irq_mask_ack           = intc_mask_ack,
 204         .irq_enable             = intc_enable,
 205         .irq_disable            = intc_disable,
 206         .irq_set_type           = intc_set_type,
 207 #ifdef CONFIG_SMP
 208         .irq_set_affinity       = intc_set_affinity,
 209 #endif
 210         .flags                  = IRQCHIP_SKIP_SET_WAKE,
 211 };