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_domain *mpc8xx_pic_host;
 21static unsigned long mpc8xx_cached_irq_mask;
 22static sysconf8xx_t __iomem *siu_reg;
 23
 24static inline unsigned long mpc8xx_irqd_to_bit(struct irq_data *d)
 25{
 26	return 0x80000000 >> irqd_to_hwirq(d);
 27}
 28
 29static void mpc8xx_unmask_irq(struct irq_data *d)
 30{
 31	mpc8xx_cached_irq_mask |= mpc8xx_irqd_to_bit(d);
 32	out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
 33}
 34
 35static void mpc8xx_mask_irq(struct irq_data *d)
 36{
 37	mpc8xx_cached_irq_mask &= ~mpc8xx_irqd_to_bit(d);
 38	out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
 39}
 40
 41static void mpc8xx_ack(struct irq_data *d)
 42{
 43	out_be32(&siu_reg->sc_sipend, mpc8xx_irqd_to_bit(d));
 44}
 45
 46static void mpc8xx_end_irq(struct irq_data *d)
 47{
 48	mpc8xx_cached_irq_mask |= mpc8xx_irqd_to_bit(d);
 49	out_be32(&siu_reg->sc_simask, mpc8xx_cached_irq_mask);
 50}
 51
 52static int mpc8xx_set_irq_type(struct irq_data *d, unsigned int flow_type)
 53{
 54	/* only external IRQ senses are programmable */
 55	if ((flow_type & IRQ_TYPE_EDGE_FALLING) && !(irqd_to_hwirq(d) & 1)) {
 56		unsigned int siel = in_be32(&siu_reg->sc_siel);
 57		siel |= mpc8xx_irqd_to_bit(d);
 58		out_be32(&siu_reg->sc_siel, siel);
 59		__irq_set_handler_locked(d->irq, handle_edge_irq);
 60	}
 61	return 0;
 62}
 63
 64static struct irq_chip mpc8xx_pic = {
 65	.name = "MPC8XX SIU",
 66	.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,
 71};
 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
 89static int mpc8xx_pic_host_map(struct irq_domain *h, unsigned int virq,
 90			  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 */
 95	irq_set_chip_and_handler(virq, &mpc8xx_pic, handle_level_irq);
 96	return 0;
 97}
 98
 99
100static int mpc8xx_pic_host_xlate(struct irq_domain *h, struct device_node *ct,
101			    const u32 *intspec, unsigned int intsize,
102			    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
111	if (intspec[0] > 0x1f)
112		return 0;
113
114	*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
124static struct irq_domain_ops mpc8xx_pic_host_ops = {
125	.map = mpc8xx_pic_host_map,
126	.xlate = mpc8xx_pic_host_xlate,
127};
128
129int mpc8xx_pic_init(void)
130{
131	struct resource res;
132	struct device_node *np;
133	int ret;
134
135	np = of_find_compatible_node(NULL, NULL, "fsl,pq1-pic");
136	if (np == NULL)
137		np = of_find_node_by_type(NULL, "mpc8xx-pic");
138	if (np == NULL) {
139		printk(KERN_ERR "Could not find fsl,pq1-pic node\n");
140		return -ENOMEM;
141	}
142
143	ret = of_address_to_resource(np, 0, &res);
144	if (ret)
145		goto out;
146
147	siu_reg = ioremap(res.start, resource_size(&res));
148	if (siu_reg == NULL) {
149		ret = -EINVAL;
150		goto out;
151	}
152
153	mpc8xx_pic_host = irq_domain_add_linear(np, 64, &mpc8xx_pic_host_ops, NULL);
154	if (mpc8xx_pic_host == NULL) {
155		printk(KERN_ERR "MPC8xx PIC: failed to allocate irq host!\n");
156		ret = -ENOMEM;
157		goto out;
158	}
159	return 0;
160
161out:
162	of_node_put(np);
163	return ret;
164}