Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.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(unsigned int virq)
29 {
30         int     bit, word;
31         unsigned int irq_nr = (unsigned int)irq_map[virq].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(unsigned int virq)
41 {
42         int     bit, word;
43         unsigned int irq_nr = (unsigned int)irq_map[virq].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(unsigned int virq)
53 {
54         int     bit;
55         unsigned int irq_nr = (unsigned int)irq_map[virq].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(unsigned int virq)
62 {
63         int bit, word;
64         unsigned int irq_nr = (unsigned int)irq_map[virq].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(unsigned int virq, unsigned int flow_type)
74 {
75         struct irq_desc *desc = irq_to_desc(virq);
76
77         desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
78         desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
79         if (flow_type & (IRQ_TYPE_LEVEL_HIGH | IRQ_TYPE_LEVEL_LOW))
80                 desc->status |= IRQ_LEVEL;
81
82         if (flow_type & IRQ_TYPE_EDGE_FALLING) {
83                 irq_hw_number_t hw = (unsigned int)irq_map[virq].hwirq;
84                 unsigned int siel = in_be32(&siu_reg->sc_siel);
85
86                 /* only external IRQ senses are programmable */
87                 if ((hw & 1) == 0) {
88                         siel |= (0x80000000 >> hw);
89                         out_be32(&siu_reg->sc_siel, siel);
90                         desc->handle_irq = handle_edge_irq;
91                 }
92         }
93         return 0;
94 }
95
96 static struct irq_chip mpc8xx_pic = {
97         .name = " MPC8XX SIU ",
98         .unmask = mpc8xx_unmask_irq,
99         .mask = mpc8xx_mask_irq,
100         .ack = mpc8xx_ack,
101         .eoi = mpc8xx_end_irq,
102         .set_type = mpc8xx_set_irq_type,
103 };
104
105 unsigned int mpc8xx_get_irq(void)
106 {
107         int irq;
108
109         /* For MPC8xx, read the SIVEC register and shift the bits down
110          * to get the irq number.
111          */
112         irq = in_be32(&siu_reg->sc_sivec) >> 26;
113
114         if (irq == PIC_VEC_SPURRIOUS)
115                 irq = NO_IRQ;
116
117         return irq_linear_revmap(mpc8xx_pic_host, irq);
118
119 }
120
121 static int mpc8xx_pic_host_map(struct irq_host *h, unsigned int virq,
122                           irq_hw_number_t hw)
123 {
124         pr_debug("mpc8xx_pic_host_map(%d, 0x%lx)\n", virq, hw);
125
126         /* Set default irq handle */
127         set_irq_chip_and_handler(virq, &mpc8xx_pic, handle_level_irq);
128         return 0;
129 }
130
131
132 static int mpc8xx_pic_host_xlate(struct irq_host *h, struct device_node *ct,
133                             const u32 *intspec, unsigned int intsize,
134                             irq_hw_number_t *out_hwirq, unsigned int *out_flags)
135 {
136         static unsigned char map_pic_senses[4] = {
137                 IRQ_TYPE_EDGE_RISING,
138                 IRQ_TYPE_LEVEL_LOW,
139                 IRQ_TYPE_LEVEL_HIGH,
140                 IRQ_TYPE_EDGE_FALLING,
141         };
142
143         *out_hwirq = intspec[0];
144         if (intsize > 1 && intspec[1] < 4)
145                 *out_flags = map_pic_senses[intspec[1]];
146         else
147                 *out_flags = IRQ_TYPE_NONE;
148
149         return 0;
150 }
151
152
153 static struct irq_host_ops mpc8xx_pic_host_ops = {
154         .map = mpc8xx_pic_host_map,
155         .xlate = mpc8xx_pic_host_xlate,
156 };
157
158 int mpc8xx_pic_init(void)
159 {
160         struct resource res;
161         struct device_node *np;
162         int ret;
163
164         np = of_find_compatible_node(NULL, NULL, "fsl,pq1-pic");
165         if (np == NULL)
166                 np = of_find_node_by_type(NULL, "mpc8xx-pic");
167         if (np == NULL) {
168                 printk(KERN_ERR "Could not find fsl,pq1-pic node\n");
169                 return -ENOMEM;
170         }
171
172         ret = of_address_to_resource(np, 0, &res);
173         if (ret)
174                 goto out;
175
176         siu_reg = ioremap(res.start, res.end - res.start + 1);
177         if (siu_reg == NULL) {
178                 ret = -EINVAL;
179                 goto out;
180         }
181
182         mpc8xx_pic_host = irq_alloc_host(np, IRQ_HOST_MAP_LINEAR,
183                                          64, &mpc8xx_pic_host_ops, 64);
184         if (mpc8xx_pic_host == NULL) {
185                 printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
186                 ret = -ENOMEM;
187                 goto out;
188         }
189         return 0;
190
191 out:
192         of_node_put(np);
193         return ret;
194 }