Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1#include <linux/kernel.h>
2#include <linux/stddef.h>
3#include <linux/init.h>
4#include <linux/sched.h>
5#include <linux/signal.h>
6#include <linux/irq.h>
7#include <linux/dma-mapping.h>
8#include <asm/prom.h>
9#include <asm/irq.h>
10#include <asm/io.h>
11#include <asm/8xx_immap.h>
12
13#include "mpc8xx_pic.h"
14
15
16#define PIC_VEC_SPURRIOUS 15
17
18extern int cpm_get_irq(struct pt_regs *regs);
19
20static struct irq_host *mpc8xx_pic_host;
21#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
22static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
23static sysconf8xx_t __iomem *siu_reg;
24
25int cpm_get_irq(struct pt_regs *regs);
26
27static void mpc8xx_unmask_irq(struct irq_data *d)
28{
29 int bit, word;
30 unsigned int irq_nr = (unsigned int)irqd_to_hwirq(d);
31
32 bit = irq_nr & 0x1f;
33 word = irq_nr >> 5;
34
35 ppc_cached_irq_mask[word] |= (1 << (31-bit));
36 out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
37}
38
39static void mpc8xx_mask_irq(struct irq_data *d)
40{
41 int bit, word;
42 unsigned int irq_nr = (unsigned int)irqd_to_hwirq(d);
43
44 bit = irq_nr & 0x1f;
45 word = irq_nr >> 5;
46
47 ppc_cached_irq_mask[word] &= ~(1 << (31-bit));
48 out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
49}
50
51static void mpc8xx_ack(struct irq_data *d)
52{
53 int bit;
54 unsigned int irq_nr = (unsigned int)irqd_to_hwirq(d);
55
56 bit = irq_nr & 0x1f;
57 out_be32(&siu_reg->sc_sipend, 1 << (31-bit));
58}
59
60static void mpc8xx_end_irq(struct irq_data *d)
61{
62 int bit, word;
63 unsigned int irq_nr = (unsigned int)irqd_to_hwirq(d);
64
65 bit = irq_nr & 0x1f;
66 word = irq_nr >> 5;
67
68 ppc_cached_irq_mask[word] |= (1 << (31-bit));
69 out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
70}
71
72static int mpc8xx_set_irq_type(struct irq_data *d, unsigned int flow_type)
73{
74 if (flow_type & IRQ_TYPE_EDGE_FALLING) {
75 irq_hw_number_t hw = (unsigned int)irqd_to_hwirq(d);
76 unsigned int siel = in_be32(&siu_reg->sc_siel);
77
78 /* only external IRQ senses are programmable */
79 if ((hw & 1) == 0) {
80 siel |= (0x80000000 >> hw);
81 out_be32(&siu_reg->sc_siel, siel);
82 __irq_set_handler_locked(d->irq, handle_edge_irq);
83 }
84 }
85 return 0;
86}
87
88static struct irq_chip mpc8xx_pic = {
89 .name = "MPC8XX SIU",
90 .irq_unmask = mpc8xx_unmask_irq,
91 .irq_mask = mpc8xx_mask_irq,
92 .irq_ack = mpc8xx_ack,
93 .irq_eoi = mpc8xx_end_irq,
94 .irq_set_type = mpc8xx_set_irq_type,
95};
96
97unsigned int mpc8xx_get_irq(void)
98{
99 int irq;
100
101 /* For MPC8xx, read the SIVEC register and shift the bits down
102 * to get the irq number.
103 */
104 irq = in_be32(&siu_reg->sc_sivec) >> 26;
105
106 if (irq == PIC_VEC_SPURRIOUS)
107 irq = NO_IRQ;
108
109 return irq_linear_revmap(mpc8xx_pic_host, irq);
110
111}
112
113static int mpc8xx_pic_host_map(struct irq_host *h, unsigned int virq,
114 irq_hw_number_t hw)
115{
116 pr_debug("mpc8xx_pic_host_map(%d, 0x%lx)\n", virq, hw);
117
118 /* Set default irq handle */
119 irq_set_chip_and_handler(virq, &mpc8xx_pic, handle_level_irq);
120 return 0;
121}
122
123
124static int mpc8xx_pic_host_xlate(struct irq_host *h, struct device_node *ct,
125 const u32 *intspec, unsigned int intsize,
126 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
127{
128 static unsigned char map_pic_senses[4] = {
129 IRQ_TYPE_EDGE_RISING,
130 IRQ_TYPE_LEVEL_LOW,
131 IRQ_TYPE_LEVEL_HIGH,
132 IRQ_TYPE_EDGE_FALLING,
133 };
134
135 *out_hwirq = intspec[0];
136 if (intsize > 1 && intspec[1] < 4)
137 *out_flags = map_pic_senses[intspec[1]];
138 else
139 *out_flags = IRQ_TYPE_NONE;
140
141 return 0;
142}
143
144
145static struct irq_host_ops mpc8xx_pic_host_ops = {
146 .map = mpc8xx_pic_host_map,
147 .xlate = mpc8xx_pic_host_xlate,
148};
149
150int mpc8xx_pic_init(void)
151{
152 struct resource res;
153 struct device_node *np;
154 int ret;
155
156 np = of_find_compatible_node(NULL, NULL, "fsl,pq1-pic");
157 if (np == NULL)
158 np = of_find_node_by_type(NULL, "mpc8xx-pic");
159 if (np == NULL) {
160 printk(KERN_ERR "Could not find fsl,pq1-pic node\n");
161 return -ENOMEM;
162 }
163
164 ret = of_address_to_resource(np, 0, &res);
165 if (ret)
166 goto out;
167
168 siu_reg = ioremap(res.start, resource_size(&res));
169 if (siu_reg == NULL) {
170 ret = -EINVAL;
171 goto out;
172 }
173
174 mpc8xx_pic_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
175 64, &mpc8xx_pic_host_ops, 64);
176 if (mpc8xx_pic_host == NULL) {
177 printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
178 ret = -ENOMEM;
179 goto out;
180 }
181 return 0;
182
183out:
184 of_node_put(np);
185 return ret;
186}