appletalk: Fix OOPS in atalk_release().
[pandora-kernel.git] / arch / powerpc / sysdev / mpc8xx_pic.c
1 #include <linux/kernel.h>
2 #include <linux/module.h>
3 #include <linux/stddef.h>
4 #include <linux/init.h>
5 #include <linux/sched.h>
6 #include <linux/signal.h>
7 #include <linux/irq.h>
8 #include <linux/dma-mapping.h>
9 #include <asm/prom.h>
10 #include <asm/irq.h>
11 #include <asm/io.h>
12 #include <asm/8xx_immap.h>
13
14 #include "mpc8xx_pic.h"
15
16
17 #define PIC_VEC_SPURRIOUS      15
18
19 extern int cpm_get_irq(struct pt_regs *regs);
20
21 static struct irq_host *mpc8xx_pic_host;
22 #define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
23 static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
24 static sysconf8xx_t __iomem *siu_reg;
25
26 int cpm_get_irq(struct pt_regs *regs);
27
28 static void mpc8xx_unmask_irq(struct irq_data *d)
29 {
30         int     bit, word;
31         unsigned int irq_nr = (unsigned int)irq_map[d->irq].hwirq;
32
33         bit = irq_nr & 0x1f;
34         word = irq_nr >> 5;
35
36         ppc_cached_irq_mask[word] |= (1 << (31-bit));
37         out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
38 }
39
40 static void mpc8xx_mask_irq(struct irq_data *d)
41 {
42         int     bit, word;
43         unsigned int irq_nr = (unsigned int)irq_map[d->irq].hwirq;
44
45         bit = irq_nr & 0x1f;
46         word = irq_nr >> 5;
47
48         ppc_cached_irq_mask[word] &= ~(1 << (31-bit));
49         out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
50 }
51
52 static void mpc8xx_ack(struct irq_data *d)
53 {
54         int     bit;
55         unsigned int irq_nr = (unsigned int)irq_map[d->irq].hwirq;
56
57         bit = irq_nr & 0x1f;
58         out_be32(&siu_reg->sc_sipend, 1 << (31-bit));
59 }
60
61 static void mpc8xx_end_irq(struct irq_data *d)
62 {
63         int bit, word;
64         unsigned int irq_nr = (unsigned int)irq_map[d->irq].hwirq;
65
66         bit = irq_nr & 0x1f;
67         word = irq_nr >> 5;
68
69         ppc_cached_irq_mask[word] |= (1 << (31-bit));
70         out_be32(&siu_reg->sc_simask, ppc_cached_irq_mask[word]);
71 }
72
73 static int mpc8xx_set_irq_type(struct irq_data *d, unsigned int flow_type)
74 {
75         if (flow_type & IRQ_TYPE_EDGE_FALLING) {
76                 irq_hw_number_t hw = (unsigned int)irq_map[d->irq].hwirq;
77                 unsigned int siel = in_be32(&siu_reg->sc_siel);
78
79                 /* only external IRQ senses are programmable */
80                 if ((hw & 1) == 0) {
81                         siel |= (0x80000000 >> hw);
82                         out_be32(&siu_reg->sc_siel, siel);
83                         __irq_set_handler_locked(irq, handle_edge_irq);
84                 }
85         }
86         return 0;
87 }
88
89 static struct irq_chip mpc8xx_pic = {
90         .name = "MPC8XX SIU",
91         .irq_unmask = mpc8xx_unmask_irq,
92         .irq_mask = mpc8xx_mask_irq,
93         .irq_ack = mpc8xx_ack,
94         .irq_eoi = mpc8xx_end_irq,
95         .irq_set_type = mpc8xx_set_irq_type,
96 };
97
98 unsigned int mpc8xx_get_irq(void)
99 {
100         int irq;
101
102         /* For MPC8xx, read the SIVEC register and shift the bits down
103          * to get the irq number.
104          */
105         irq = in_be32(&siu_reg->sc_sivec) >> 26;
106
107         if (irq == PIC_VEC_SPURRIOUS)
108                 irq = NO_IRQ;
109
110         return irq_linear_revmap(mpc8xx_pic_host, irq);
111
112 }
113
114 static int mpc8xx_pic_host_map(struct irq_host *h, unsigned int virq,
115                           irq_hw_number_t hw)
116 {
117         pr_debug("mpc8xx_pic_host_map(%d, 0x%lx)\n", virq, hw);
118
119         /* Set default irq handle */
120         irq_set_chip_and_handler(virq, &mpc8xx_pic, handle_level_irq);
121         return 0;
122 }
123
124
125 static int mpc8xx_pic_host_xlate(struct irq_host *h, struct device_node *ct,
126                             const u32 *intspec, unsigned int intsize,
127                             irq_hw_number_t *out_hwirq, unsigned int *out_flags)
128 {
129         static unsigned char map_pic_senses[4] = {
130                 IRQ_TYPE_EDGE_RISING,
131                 IRQ_TYPE_LEVEL_LOW,
132                 IRQ_TYPE_LEVEL_HIGH,
133                 IRQ_TYPE_EDGE_FALLING,
134         };
135
136         *out_hwirq = intspec[0];
137         if (intsize > 1 && intspec[1] < 4)
138                 *out_flags = map_pic_senses[intspec[1]];
139         else
140                 *out_flags = IRQ_TYPE_NONE;
141
142         return 0;
143 }
144
145
146 static struct irq_host_ops mpc8xx_pic_host_ops = {
147         .map = mpc8xx_pic_host_map,
148         .xlate = mpc8xx_pic_host_xlate,
149 };
150
151 int mpc8xx_pic_init(void)
152 {
153         struct resource res;
154         struct device_node *np;
155         int ret;
156
157         np = of_find_compatible_node(NULL, NULL, "fsl,pq1-pic");
158         if (np == NULL)
159                 np = of_find_node_by_type(NULL, "mpc8xx-pic");
160         if (np == NULL) {
161                 printk(KERN_ERR "Could not find fsl,pq1-pic node\n");
162                 return -ENOMEM;
163         }
164
165         ret = of_address_to_resource(np, 0, &res);
166         if (ret)
167                 goto out;
168
169         siu_reg = ioremap(res.start, res.end - res.start + 1);
170         if (siu_reg == NULL) {
171                 ret = -EINVAL;
172                 goto out;
173         }
174
175         mpc8xx_pic_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
176                                          64, &mpc8xx_pic_host_ops, 64);
177         if (mpc8xx_pic_host == NULL) {
178                 printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
179                 ret = -ENOMEM;
180                 goto out;
181         }
182         return 0;
183
184 out:
185         of_node_put(np);
186         return ret;
187 }