blob: b724622c3a0b74ab5eddfa3b0cfc10dc6eab2c34 [file] [log] [blame]
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +03001#include <linux/kernel.h>
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +03002#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>
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030012
13#include "mpc8xx_pic.h"
14
15
16#define PIC_VEC_SPURRIOUS 15
17
18extern int cpm_get_irq(struct pt_regs *regs);
19
Grant Likelybae1d8f2012-02-14 14:06:50 -070020static struct irq_domain *mpc8xx_pic_host;
Grant Likely8751ed12012-04-23 12:30:01 +000021static unsigned long mpc8xx_cached_irq_mask;
Scott Woodfb533d02007-09-14 14:22:36 -050022static sysconf8xx_t __iomem *siu_reg;
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030023
Grant Likely8751ed12012-04-23 12:30:01 +000024static inline unsigned long mpc8xx_irqd_to_bit(struct irq_data *d)
25{
26 return 0x80000000 >> irqd_to_hwirq(d);
27}
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030028
Lennert Buytenhekfebd4012011-03-07 14:00:00 +000029static void mpc8xx_unmask_irq(struct irq_data *d)
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030030{
Grant Likely8751ed12012-04-23 12:30:01 +000031 mpc8xx_cached_irq_mask |= mpc8xx_irqd_to_bit(d);
32 out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030033}
34
Lennert Buytenhekfebd4012011-03-07 14:00:00 +000035static void mpc8xx_mask_irq(struct irq_data *d)
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030036{
Grant Likely8751ed12012-04-23 12:30:01 +000037 mpc8xx_cached_irq_mask &= ~mpc8xx_irqd_to_bit(d);
38 out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030039}
40
Lennert Buytenhekfebd4012011-03-07 14:00:00 +000041static void mpc8xx_ack(struct irq_data *d)
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030042{
Grant Likely8751ed12012-04-23 12:30:01 +000043 out_be32(&siu_reg->sc_sipend, mpc8xx_irqd_to_bit(d));
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030044}
45
Lennert Buytenhekfebd4012011-03-07 14:00:00 +000046static void mpc8xx_end_irq(struct irq_data *d)
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030047{
Grant Likely8751ed12012-04-23 12:30:01 +000048 mpc8xx_cached_irq_mask |= mpc8xx_irqd_to_bit(d);
49 out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030050}
51
Lennert Buytenhekfebd4012011-03-07 14:00:00 +000052static int mpc8xx_set_irq_type(struct irq_data *d, unsigned int flow_type)
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030053{
Grant Likely8751ed12012-04-23 12:30:01 +000054 /* only external IRQ senses are programmable */
55 if ((flow_type & IRQ_TYPE_EDGE_FALLING) && !(irqd_to_hwirq(d) & 1)) {
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030056 unsigned int siel = in_be32(&siu_reg->sc_siel);
Grant Likely8751ed12012-04-23 12:30:01 +000057 siel |= mpc8xx_irqd_to_bit(d);
58 out_be32(&siu_reg->sc_siel, siel);
59 __irq_set_handler_locked(d->irq, handle_edge_irq);
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030060 }
61 return 0;
62}
63
64static struct irq_chip mpc8xx_pic = {
Anton Blanchardfc380c02010-01-31 20:33:41 +000065 .name = "MPC8XX SIU",
Lennert Buytenhekfebd4012011-03-07 14:00:00 +000066 .irq_unmask = mpc8xx_unmask_irq,
67 .irq_mask = mpc8xx_mask_irq,
68 .irq_ack = mpc8xx_ack,
69 .irq_eoi = mpc8xx_end_irq,
70 .irq_set_type = mpc8xx_set_irq_type,
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030071};
72
73unsigned int mpc8xx_get_irq(void)
74{
75 int irq;
76
77 /* For MPC8xx, read the SIVEC register and shift the bits down
78 * to get the irq number.
79 */
80 irq = in_be32(&siu_reg->sc_sivec) >> 26;
81
82 if (irq == PIC_VEC_SPURRIOUS)
83 irq = NO_IRQ;
84
85 return irq_linear_revmap(mpc8xx_pic_host, irq);
86
87}
88
Grant Likelybae1d8f2012-02-14 14:06:50 -070089static int mpc8xx_pic_host_map(struct irq_domain *h, unsigned int virq,
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030090 irq_hw_number_t hw)
91{
92 pr_debug("mpc8xx_pic_host_map(%d, 0x%lx)\n", virq, hw);
93
94 /* Set default irq handle */
Thomas Gleixnerec775d02011-03-25 16:45:20 +010095 irq_set_chip_and_handler(virq, &mpc8xx_pic, handle_level_irq);
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +030096 return 0;
97}
98
99
Grant Likelybae1d8f2012-02-14 14:06:50 -0700100static int mpc8xx_pic_host_xlate(struct irq_domain *h, struct device_node *ct,
Roman Fietze40d50cf2009-12-08 02:39:50 +0000101 const u32 *intspec, unsigned int intsize,
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300102 irq_hw_number_t *out_hwirq, unsigned int *out_flags)
103{
104 static unsigned char map_pic_senses[4] = {
105 IRQ_TYPE_EDGE_RISING,
106 IRQ_TYPE_LEVEL_LOW,
107 IRQ_TYPE_LEVEL_HIGH,
108 IRQ_TYPE_EDGE_FALLING,
109 };
110
Grant Likely8751ed12012-04-23 12:30:01 +0000111 if (intspec[0] > 0x1f)
112 return 0;
113
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300114 *out_hwirq = intspec[0];
115 if (intsize > 1 && intspec[1] < 4)
116 *out_flags = map_pic_senses[intspec[1]];
117 else
118 *out_flags = IRQ_TYPE_NONE;
119
120 return 0;
121}
122
123
Grant Likelybae1d8f2012-02-14 14:06:50 -0700124static struct irq_domain_ops mpc8xx_pic_host_ops = {
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300125 .map = mpc8xx_pic_host_map,
126 .xlate = mpc8xx_pic_host_xlate,
127};
128
129int mpc8xx_pic_init(void)
130{
131 struct resource res;
Scott Woodfb533d02007-09-14 14:22:36 -0500132 struct device_node *np;
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300133 int ret;
134
Scott Woodfb533d02007-09-14 14:22:36 -0500135 np = of_find_compatible_node(NULL, NULL, "fsl,pq1-pic");
136 if (np == NULL)
137 np = of_find_node_by_type(NULL, "mpc8xx-pic");
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300138 if (np == NULL) {
Scott Woodfb533d02007-09-14 14:22:36 -0500139 printk(KERN_ERR "Could not find fsl,pq1-pic node\n");
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300140 return -ENOMEM;
141 }
142
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300143 ret = of_address_to_resource(np, 0, &res);
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300144 if (ret)
Michael Ellerman52964f82007-08-28 18:47:54 +1000145 goto out;
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300146
Joe Perches28f65c12011-06-09 09:13:32 -0700147 siu_reg = ioremap(res.start, resource_size(&res));
Julia Lawallb1725c92008-02-04 23:34:59 -0800148 if (siu_reg == NULL) {
149 ret = -EINVAL;
150 goto out;
151 }
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300152
Grant Likelya8db8cf2012-02-14 14:06:54 -0700153 mpc8xx_pic_host = irq_domain_add_linear(np, 64, &mpc8xx_pic_host_ops, NULL);
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300154 if (mpc8xx_pic_host == NULL) {
155 printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
156 ret = -ENOMEM;
Julia Lawallb1725c92008-02-04 23:34:59 -0800157 goto out;
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300158 }
Julia Lawallb1725c92008-02-04 23:34:59 -0800159 return 0;
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300160
Michael Ellerman52964f82007-08-28 18:47:54 +1000161out:
162 of_node_put(np);
Vitaly Bordugf2a0bd32007-01-24 22:41:24 +0300163 return ret;
164}