[linux-2.6-block.git] / arch / powerpc / sysdev / qe_lib / qe_ic.c

/*
 * arch/powerpc/sysdev/qe_lib/qe_ic.c
 *
 * Copyright (C) 2006 Freescale Semiconductor, Inc.  All rights reserved.
 *
 * Author: Li Yang <leoli@freescale.com>
 * Based on code from Shlomi Gridish <gridish@freescale.com>
 *
 * QUICC ENGINE Interrupt Controller
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/reboot.h>
#include <linux/slab.h>
#include <linux/stddef.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/device.h>
#include <linux/spinlock.h>
#include <asm/irq.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/qe_ic.h>

#include "qe_ic.h"

static DEFINE_RAW_SPINLOCK(qe_ic_lock);

static struct qe_ic_info qe_ic_info[] = {
	[1] = {
	       .mask = 0x00008000,
	       .mask_reg = QEIC_CIMR,
	       .pri_code = 0,
	       .pri_reg = QEIC_CIPWCC,
	       },
	[2] = {
	       .mask = 0x00004000,
	       .mask_reg = QEIC_CIMR,
	       .pri_code = 1,
	       .pri_reg = QEIC_CIPWCC,
	       },
	[3] = {
	       .mask = 0x00002000,
	       .mask_reg = QEIC_CIMR,
	       .pri_code = 2,
	       .pri_reg = QEIC_CIPWCC,
	       },
	[10] = {
		.mask = 0x00000040,
		.mask_reg = QEIC_CIMR,
		.pri_code = 1,
		.pri_reg = QEIC_CIPZCC,
		},
	[11] = {
		.mask = 0x00000020,
		.mask_reg = QEIC_CIMR,
		.pri_code = 2,
		.pri_reg = QEIC_CIPZCC,
		},
	[12] = {
		.mask = 0x00000010,
		.mask_reg = QEIC_CIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPZCC,
		},
	[13] = {
		.mask = 0x00000008,
		.mask_reg = QEIC_CIMR,
		.pri_code = 4,
		.pri_reg = QEIC_CIPZCC,
		},
	[14] = {
		.mask = 0x00000004,
		.mask_reg = QEIC_CIMR,
		.pri_code = 5,
		.pri_reg = QEIC_CIPZCC,
		},
	[15] = {
		.mask = 0x00000002,
		.mask_reg = QEIC_CIMR,
		.pri_code = 6,
		.pri_reg = QEIC_CIPZCC,
		},
	[20] = {
		.mask = 0x10000000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPRTA,
		},
	[25] = {
		.mask = 0x00800000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 0,
		.pri_reg = QEIC_CIPRTB,
		},
	[26] = {
		.mask = 0x00400000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 1,
		.pri_reg = QEIC_CIPRTB,
		},
	[27] = {
		.mask = 0x00200000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 2,
		.pri_reg = QEIC_CIPRTB,
		},
	[28] = {
		.mask = 0x00100000,
		.mask_reg = QEIC_CRIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPRTB,
		},
	[32] = {
		.mask = 0x80000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 0,
		.pri_reg = QEIC_CIPXCC,
		},
	[33] = {
		.mask = 0x40000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 1,
		.pri_reg = QEIC_CIPXCC,
		},
	[34] = {
		.mask = 0x20000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 2,
		.pri_reg = QEIC_CIPXCC,
		},
	[35] = {
		.mask = 0x10000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPXCC,
		},
	[36] = {
		.mask = 0x08000000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 4,
		.pri_reg = QEIC_CIPXCC,
		},
	[40] = {
		.mask = 0x00800000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 0,
		.pri_reg = QEIC_CIPYCC,
		},
	[41] = {
		.mask = 0x00400000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 1,
		.pri_reg = QEIC_CIPYCC,
		},
	[42] = {
		.mask = 0x00200000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 2,
		.pri_reg = QEIC_CIPYCC,
		},
	[43] = {
		.mask = 0x00100000,
		.mask_reg = QEIC_CIMR,
		.pri_code = 3,
		.pri_reg = QEIC_CIPYCC,
		},
};

static inline u32 qe_ic_read(volatile __be32  __iomem * base, unsigned int reg)
{
	return in_be32(base + (reg >> 2));
}

static inline void qe_ic_write(volatile __be32  __iomem * base, unsigned int reg,
			       u32 value)
{
	out_be32(base + (reg >> 2), value);
}

static inline struct qe_ic *qe_ic_from_irq(unsigned int virq)
{
	return irq_get_chip_data(virq);
}

static inline struct qe_ic *qe_ic_from_irq_data(struct irq_data *d)
{
	return irq_data_get_irq_chip_data(d);
}

static void qe_ic_unmask_irq(struct irq_data *d)
{
	struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
	unsigned int src = irqd_to_hwirq(d);
	unsigned long flags;
	u32 temp;

	raw_spin_lock_irqsave(&qe_ic_lock, flags);

	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
	qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
		    temp | qe_ic_info[src].mask);

	raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
}

static void qe_ic_mask_irq(struct irq_data *d)
{
	struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
	unsigned int src = irqd_to_hwirq(d);
	unsigned long flags;
	u32 temp;

	raw_spin_lock_irqsave(&qe_ic_lock, flags);

	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
	qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
		    temp & ~qe_ic_info[src].mask);

	/* Flush the above write before enabling interrupts; otherwise,
	 * spurious interrupts will sometimes happen.  To be 100% sure
	 * that the write has reached the device before interrupts are
	 * enabled, the mask register would have to be read back; however,
	 * this is not required for correctness, only to avoid wasting
	 * time on a large number of spurious interrupts.  In testing,
	 * a sync reduced the observed spurious interrupts to zero.
	 */
	mb();

	raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
}

static struct irq_chip qe_ic_irq_chip = {
	.name = "QEIC",
	.irq_unmask = qe_ic_unmask_irq,
	.irq_mask = qe_ic_mask_irq,
	.irq_mask_ack = qe_ic_mask_irq,
};

static int qe_ic_host_match(struct irq_domain *h, struct device_node *node)
{
	/* Exact match, unless qe_ic node is NULL */
	return h->of_node == NULL || h->of_node == node;
}

static int qe_ic_host_map(struct irq_domain *h, unsigned int virq,
			  irq_hw_number_t hw)
{
	struct qe_ic *qe_ic = h->host_data;
	struct irq_chip *chip;

	if (qe_ic_info[hw].mask == 0) {
		printk(KERN_ERR "Can't map reserved IRQ\n");
		return -EINVAL;
	}
	/* Default chip */
	chip = &qe_ic->hc_irq;

	irq_set_chip_data(virq, qe_ic);
	irq_set_status_flags(virq, IRQ_LEVEL);

	irq_set_chip_and_handler(virq, chip, handle_level_irq);

	return 0;
}

static const struct irq_domain_ops qe_ic_host_ops = {
	.match = qe_ic_host_match,
	.map = qe_ic_host_map,
	.xlate = irq_domain_xlate_onetwocell,
};

/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
{
	int irq;

	BUG_ON(qe_ic == NULL);

	/* get the interrupt source vector. */
	irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26;

	if (irq == 0)
		return NO_IRQ;

	return irq_linear_revmap(qe_ic->irqhost, irq);
}

/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
{
	int irq;

	BUG_ON(qe_ic == NULL);

	/* get the interrupt source vector. */
	irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26;

	if (irq == 0)
		return NO_IRQ;

	return irq_linear_revmap(qe_ic->irqhost, irq);
}

void __init qe_ic_init(struct device_node *node, unsigned int flags,
		void (*low_handler)(unsigned int irq, struct irq_desc *desc),
		void (*high_handler)(unsigned int irq, struct irq_desc *desc))
{
	struct qe_ic *qe_ic;
	struct resource res;
	u32 temp = 0, ret, high_active = 0;

	ret = of_address_to_resource(node, 0, &res);
	if (ret)
		return;

	qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL);
	if (qe_ic == NULL)
		return;

	qe_ic->irqhost = irq_domain_add_linear(node, NR_QE_IC_INTS,
					       &qe_ic_host_ops, qe_ic);
	if (qe_ic->irqhost == NULL) {
		kfree(qe_ic);
		return;
	}

	qe_ic->regs = ioremap(res.start, resource_size(&res));

	qe_ic->hc_irq = qe_ic_irq_chip;

	qe_ic->virq_high = irq_of_parse_and_map(node, 0);
	qe_ic->virq_low = irq_of_parse_and_map(node, 1);

	if (qe_ic->virq_low == NO_IRQ) {
		printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
		kfree(qe_ic);
		return;
	}

	/* default priority scheme is grouped. If spread mode is    */
	/* required, configure cicr accordingly.                    */
	if (flags & QE_IC_SPREADMODE_GRP_W)
		temp |= CICR_GWCC;
	if (flags & QE_IC_SPREADMODE_GRP_X)
		temp |= CICR_GXCC;
	if (flags & QE_IC_SPREADMODE_GRP_Y)
		temp |= CICR_GYCC;
	if (flags & QE_IC_SPREADMODE_GRP_Z)
		temp |= CICR_GZCC;
	if (flags & QE_IC_SPREADMODE_GRP_RISCA)
		temp |= CICR_GRTA;
	if (flags & QE_IC_SPREADMODE_GRP_RISCB)
		temp |= CICR_GRTB;

	/* choose destination signal for highest priority interrupt */
	if (flags & QE_IC_HIGH_SIGNAL) {
		temp |= (SIGNAL_HIGH << CICR_HPIT_SHIFT);
		high_active = 1;
	}

	qe_ic_write(qe_ic->regs, QEIC_CICR, temp);

	irq_set_handler_data(qe_ic->virq_low, qe_ic);
	irq_set_chained_handler(qe_ic->virq_low, low_handler);

	if (qe_ic->virq_high != NO_IRQ &&
			qe_ic->virq_high != qe_ic->virq_low) {
		irq_set_handler_data(qe_ic->virq_high, qe_ic);
		irq_set_chained_handler(qe_ic->virq_high, high_handler);
	}
}

void qe_ic_set_highest_priority(unsigned int virq, int high)
{
	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	unsigned int src = virq_to_hw(virq);
	u32 temp = 0;

	temp = qe_ic_read(qe_ic->regs, QEIC_CICR);

	temp &= ~CICR_HP_MASK;
	temp |= src << CICR_HP_SHIFT;

	temp &= ~CICR_HPIT_MASK;
	temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT;

	qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
}

/* Set Priority level within its group, from 1 to 8 */
int qe_ic_set_priority(unsigned int virq, unsigned int priority)
{
	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	unsigned int src = virq_to_hw(virq);
	u32 temp;

	if (priority > 8 || priority == 0)
		return -EINVAL;
	if (src > 127)
		return -EINVAL;
	if (qe_ic_info[src].pri_reg == 0)
		return -EINVAL;

	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg);

	if (priority < 4) {
		temp &= ~(0x7 << (32 - priority * 3));
		temp |= qe_ic_info[src].pri_code << (32 - priority * 3);
	} else {
		temp &= ~(0x7 << (24 - priority * 3));
		temp |= qe_ic_info[src].pri_code << (24 - priority * 3);
	}

	qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp);

	return 0;
}

/* Set a QE priority to use high irq, only priority 1~2 can use high irq */
int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high)
{
	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	unsigned int src = virq_to_hw(virq);
	u32 temp, control_reg = QEIC_CICNR, shift = 0;

	if (priority > 2 || priority == 0)
		return -EINVAL;

	switch (qe_ic_info[src].pri_reg) {
	case QEIC_CIPZCC:
		shift = CICNR_ZCC1T_SHIFT;
		break;
	case QEIC_CIPWCC:
		shift = CICNR_WCC1T_SHIFT;
		break;
	case QEIC_CIPYCC:
		shift = CICNR_YCC1T_SHIFT;
		break;
	case QEIC_CIPXCC:
		shift = CICNR_XCC1T_SHIFT;
		break;
	case QEIC_CIPRTA:
		shift = CRICR_RTA1T_SHIFT;
		control_reg = QEIC_CRICR;
		break;
	case QEIC_CIPRTB:
		shift = CRICR_RTB1T_SHIFT;
		control_reg = QEIC_CRICR;
		break;
	default:
		return -EINVAL;
	}

	shift += (2 - priority) * 2;
	temp = qe_ic_read(qe_ic->regs, control_reg);
	temp &= ~(SIGNAL_MASK << shift);
	temp |= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift;
	qe_ic_write(qe_ic->regs, control_reg, temp);

	return 0;
}

static struct bus_type qe_ic_subsys = {
	.name = "qe_ic",
	.dev_name = "qe_ic",
};

static struct device device_qe_ic = {
	.id = 0,
	.bus = &qe_ic_subsys,
};

static int __init init_qe_ic_sysfs(void)
{
	int rc;

	printk(KERN_DEBUG "Registering qe_ic with sysfs...\n");

	rc = subsys_system_register(&qe_ic_subsys, NULL);
	if (rc) {
		printk(KERN_ERR "Failed registering qe_ic sys class\n");
		return -ENODEV;
	}
	rc = device_register(&device_qe_ic);
	if (rc) {
		printk(KERN_ERR "Failed registering qe_ic sys device\n");
		return -ENODEV;
	}
	return 0;
}

subsys_initcall(init_qe_ic_sysfs);
Commit	Line	Data
98658538 LY	1	/*
	2	* arch/powerpc/sysdev/qe_lib/qe_ic.c
	3	*
8a56e1ee	4	* Copyright (C) 2006 Freescale Semiconductor, Inc. All rights reserved.
98658538 LY	5	*
	6	* Author: Li Yang <leoli@freescale.com>
	7	* Based on code from Shlomi Gridish <gridish@freescale.com>
	8	*
	9	* QUICC ENGINE Interrupt Controller
	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
	15	*/
	16
	17	#include <linux/kernel.h>
	18	#include <linux/init.h>
	19	#include <linux/errno.h>
	20	#include <linux/reboot.h>
	21	#include <linux/slab.h>
	22	#include <linux/stddef.h>
	23	#include <linux/sched.h>
	24	#include <linux/signal.h>
98658538	25	#include <linux/device.h>
98658538 LY	26	#include <linux/spinlock.h>
	27	#include <asm/irq.h>
	28	#include <asm/io.h>
	29	#include <asm/prom.h>
	30	#include <asm/qe_ic.h>
	31
	32	#include "qe_ic.h"
	33
43a5a01b	34	static DEFINE_RAW_SPINLOCK(qe_ic_lock);
98658538 LY	35
	36	static struct qe_ic_info qe_ic_info[] = {
	37	[1] = {
	38	.mask = 0x00008000,
	39	.mask_reg = QEIC_CIMR,
	40	.pri_code = 0,
	41	.pri_reg = QEIC_CIPWCC,
	42	},
	43	[2] = {
	44	.mask = 0x00004000,
	45	.mask_reg = QEIC_CIMR,
	46	.pri_code = 1,
	47	.pri_reg = QEIC_CIPWCC,
	48	},
	49	[3] = {
	50	.mask = 0x00002000,
	51	.mask_reg = QEIC_CIMR,
	52	.pri_code = 2,
	53	.pri_reg = QEIC_CIPWCC,
	54	},
	55	[10] = {
	56	.mask = 0x00000040,
	57	.mask_reg = QEIC_CIMR,
	58	.pri_code = 1,
	59	.pri_reg = QEIC_CIPZCC,
	60	},
	61	[11] = {
	62	.mask = 0x00000020,
	63	.mask_reg = QEIC_CIMR,
	64	.pri_code = 2,
	65	.pri_reg = QEIC_CIPZCC,
	66	},
	67	[12] = {
	68	.mask = 0x00000010,
	69	.mask_reg = QEIC_CIMR,
	70	.pri_code = 3,
	71	.pri_reg = QEIC_CIPZCC,
	72	},
	73	[13] = {
	74	.mask = 0x00000008,
	75	.mask_reg = QEIC_CIMR,
	76	.pri_code = 4,
	77	.pri_reg = QEIC_CIPZCC,
	78	},
	79	[14] = {
	80	.mask = 0x00000004,
	81	.mask_reg = QEIC_CIMR,
	82	.pri_code = 5,
	83	.pri_reg = QEIC_CIPZCC,
	84	},
	85	[15] = {
	86	.mask = 0x00000002,
	87	.mask_reg = QEIC_CIMR,
	88	.pri_code = 6,
	89	.pri_reg = QEIC_CIPZCC,
	90	},
	91	[20] = {
	92	.mask = 0x10000000,
	93	.mask_reg = QEIC_CRIMR,
	94	.pri_code = 3,
	95	.pri_reg = QEIC_CIPRTA,
	96	},
	97	[25] = {
	98	.mask = 0x00800000,
99	.mask_reg = QEIC_CRIMR,
100	.pri_code = 0,
101	.pri_reg = QEIC_CIPRTB,
102	},
103	[26] = {
104	.mask = 0x00400000,
105	.mask_reg = QEIC_CRIMR,
106	.pri_code = 1,
107	.pri_reg = QEIC_CIPRTB,
108	},
109	[27] = {
110	.mask = 0x00200000,
111	.mask_reg = QEIC_CRIMR,
112	.pri_code = 2,
113	.pri_reg = QEIC_CIPRTB,
114	},
115	[28] = {
116	.mask = 0x00100000,
117	.mask_reg = QEIC_CRIMR,
118	.pri_code = 3,
119	.pri_reg = QEIC_CIPRTB,
120	},
121	[32] = {
122	.mask = 0x80000000,
123	.mask_reg = QEIC_CIMR,
124	.pri_code = 0,
125	.pri_reg = QEIC_CIPXCC,
126	},
127	[33] = {
128	.mask = 0x40000000,
129	.mask_reg = QEIC_CIMR,
130	.pri_code = 1,
131	.pri_reg = QEIC_CIPXCC,
132	},
133	[34] = {
134	.mask = 0x20000000,
135	.mask_reg = QEIC_CIMR,
136	.pri_code = 2,
137	.pri_reg = QEIC_CIPXCC,
138	},
139	[35] = {
140	.mask = 0x10000000,
141	.mask_reg = QEIC_CIMR,
142	.pri_code = 3,
143	.pri_reg = QEIC_CIPXCC,
144	},
145	[36] = {
146	.mask = 0x08000000,
147	.mask_reg = QEIC_CIMR,
148	.pri_code = 4,
149	.pri_reg = QEIC_CIPXCC,
150	},
151	[40] = {
152	.mask = 0x00800000,
153	.mask_reg = QEIC_CIMR,
154	.pri_code = 0,
155	.pri_reg = QEIC_CIPYCC,
156	},
157	[41] = {
158	.mask = 0x00400000,
159	.mask_reg = QEIC_CIMR,
160	.pri_code = 1,
161	.pri_reg = QEIC_CIPYCC,
162	},
163	[42] = {
164	.mask = 0x00200000,
165	.mask_reg = QEIC_CIMR,
166	.pri_code = 2,
167	.pri_reg = QEIC_CIPYCC,
168	},
169	[43] = {
170	.mask = 0x00100000,
171	.mask_reg = QEIC_CIMR,
172	.pri_code = 3,
173	.pri_reg = QEIC_CIPYCC,
174	},
175	};
176
177	static inline u32 qe_ic_read(volatile __be32 __iomem * base, unsigned int reg)
178	{
179	return in_be32(base + (reg >> 2));
180	}
181
182	static inline void qe_ic_write(volatile __be32 __iomem * base, unsigned int reg,
183	u32 value)
184	{
185	out_be32(base + (reg >> 2), value);
186	}
187
188	static inline struct qe_ic *qe_ic_from_irq(unsigned int virq)
189	{
ec775d0e	190	return irq_get_chip_data(virq);
3a0adfab LB	191	}
	192
	193	static inline struct qe_ic qe_ic_from_irq_data(struct irq_data d)
	194	{
	195	return irq_data_get_irq_chip_data(d);
98658538 LY	196	}
98658538 LY	197
3a0adfab	198	static void qe_ic_unmask_irq(struct irq_data *d)
98658538	199	{
3a0adfab	200	struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
476eb491	201	unsigned int src = irqd_to_hwirq(d);
98658538 LY	202	unsigned long flags;
	203	u32 temp;
	204
43a5a01b	205	raw_spin_lock_irqsave(&qe_ic_lock, flags);
98658538 LY	206
	207	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
	208	qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
	209	temp \| qe_ic_info[src].mask);
	210
43a5a01b	211	raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
98658538 LY	212	}
98658538 LY	213
3a0adfab	214	static void qe_ic_mask_irq(struct irq_data *d)
98658538	215	{
3a0adfab	216	struct qe_ic *qe_ic = qe_ic_from_irq_data(d);
476eb491	217	unsigned int src = irqd_to_hwirq(d);
98658538 LY	218	unsigned long flags;
	219	u32 temp;
	220
43a5a01b	221	raw_spin_lock_irqsave(&qe_ic_lock, flags);
98658538 LY	222
	223	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].mask_reg);
	224	qe_ic_write(qe_ic->regs, qe_ic_info[src].mask_reg,
	225	temp & ~qe_ic_info[src].mask);
	226
2c1d2f34 SW	227	/* Flush the above write before enabling interrupts; otherwise,
	228	* spurious interrupts will sometimes happen. To be 100% sure
	229	* that the write has reached the device before interrupts are
	230	* enabled, the mask register would have to be read back; however,
	231	* this is not required for correctness, only to avoid wasting
	232	* time on a large number of spurious interrupts. In testing,
	233	* a sync reduced the observed spurious interrupts to zero.
	234	*/
	235	mb();
98658538	236
43a5a01b	237	raw_spin_unlock_irqrestore(&qe_ic_lock, flags);
98658538 LY	238	}
	239
	240	static struct irq_chip qe_ic_irq_chip = {
fc380c0c	241	.name = "QEIC",
3a0adfab LB	242	.irq_unmask = qe_ic_unmask_irq,
	243	.irq_mask = qe_ic_mask_irq,
	244	.irq_mask_ack = qe_ic_mask_irq,
98658538 LY	245	};
98658538 LY	246
bae1d8f1	247	static int qe_ic_host_match(struct irq_domain h, struct device_node node)
98658538	248	{
98658538	249	/* Exact match, unless qe_ic node is NULL */
52964f87	250	return h->of_node == NULL \|\| h->of_node == node;
98658538 LY	251	}
98658538 LY	252
bae1d8f1	253	static int qe_ic_host_map(struct irq_domain *h, unsigned int virq,
98658538 LY	254	irq_hw_number_t hw)
	255	{
	256	struct qe_ic *qe_ic = h->host_data;
	257	struct irq_chip *chip;
	258
	259	if (qe_ic_info[hw].mask == 0) {
8354be9c	260	printk(KERN_ERR "Can't map reserved IRQ\n");
98658538 LY	261	return -EINVAL;
	262	}
	263	/* Default chip */
	264	chip = &qe_ic->hc_irq;
	265
ec775d0e	266	irq_set_chip_data(virq, qe_ic);
98488db9	267	irq_set_status_flags(virq, IRQ_LEVEL);
98658538	268
ec775d0e	269	irq_set_chip_and_handler(virq, chip, handle_level_irq);
98658538 LY	270
	271	return 0;
	272	}
	273
202648a6	274	static const struct irq_domain_ops qe_ic_host_ops = {
98658538 LY	275	.match = qe_ic_host_match,
98658538 LY	276	.map = qe_ic_host_map,
ff8c3ab8	277	.xlate = irq_domain_xlate_onetwocell,
98658538 LY	278	};
	279
	280	/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
35a84c2f	281	unsigned int qe_ic_get_low_irq(struct qe_ic *qe_ic)
98658538 LY	282	{
	283	int irq;
	284
	285	BUG_ON(qe_ic == NULL);
	286
	287	/* get the interrupt source vector. */
	288	irq = qe_ic_read(qe_ic->regs, QEIC_CIVEC) >> 26;
	289
	290	if (irq == 0)
	291	return NO_IRQ;
	292
	293	return irq_linear_revmap(qe_ic->irqhost, irq);
	294	}
	295
	296	/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
35a84c2f	297	unsigned int qe_ic_get_high_irq(struct qe_ic *qe_ic)
98658538 LY	298	{
	299	int irq;
	300
	301	BUG_ON(qe_ic == NULL);
	302
	303	/* get the interrupt source vector. */
	304	irq = qe_ic_read(qe_ic->regs, QEIC_CHIVEC) >> 26;
	305
	306	if (irq == 0)
	307	return NO_IRQ;
	308
	309	return irq_linear_revmap(qe_ic->irqhost, irq);
	310	}
	311
cccd2102 AV	312	void __init qe_ic_init(struct device_node *node, unsigned int flags,
	313	void (low_handler)(unsigned int irq, struct irq_desc desc),
	314	void (high_handler)(unsigned int irq, struct irq_desc desc))
98658538 LY	315	{
	316	struct qe_ic *qe_ic;
	317	struct resource res;
	318	u32 temp = 0, ret, high_active = 0;
	319
2272a55f ME	320	ret = of_address_to_resource(node, 0, &res);
	321	if (ret)
	322	return;
	323
ea96025a	324	qe_ic = kzalloc(sizeof(*qe_ic), GFP_KERNEL);
98658538 LY	325	if (qe_ic == NULL)
	326	return;
	327
a8db8cf0 GL	328	qe_ic->irqhost = irq_domain_add_linear(node, NR_QE_IC_INTS,
a8db8cf0 GL	329	&qe_ic_host_ops, qe_ic);
3475dd8a JL	330	if (qe_ic->irqhost == NULL) {
3475dd8a JL	331	kfree(qe_ic);
98658538	332	return;
3475dd8a	333	}
98658538	334
28f65c11	335	qe_ic->regs = ioremap(res.start, resource_size(&res));
98658538	336
98658538 LY	337	qe_ic->hc_irq = qe_ic_irq_chip;
	338
	339	qe_ic->virq_high = irq_of_parse_and_map(node, 0);
	340	qe_ic->virq_low = irq_of_parse_and_map(node, 1);
	341
	342	if (qe_ic->virq_low == NO_IRQ) {
	343	printk(KERN_ERR "Failed to map QE_IC low IRQ\n");
3475dd8a	344	kfree(qe_ic);
98658538 LY	345	return;
	346	}
	347
	348	/* default priority scheme is grouped. If spread mode is */
	349	/* required, configure cicr accordingly. */
	350	if (flags & QE_IC_SPREADMODE_GRP_W)
	351	temp \|= CICR_GWCC;
	352	if (flags & QE_IC_SPREADMODE_GRP_X)
	353	temp \|= CICR_GXCC;
	354	if (flags & QE_IC_SPREADMODE_GRP_Y)
	355	temp \|= CICR_GYCC;
	356	if (flags & QE_IC_SPREADMODE_GRP_Z)
	357	temp \|= CICR_GZCC;
	358	if (flags & QE_IC_SPREADMODE_GRP_RISCA)
	359	temp \|= CICR_GRTA;
	360	if (flags & QE_IC_SPREADMODE_GRP_RISCB)
	361	temp \|= CICR_GRTB;
	362
	363	/* choose destination signal for highest priority interrupt */
	364	if (flags & QE_IC_HIGH_SIGNAL) {
	365	temp \|= (SIGNAL_HIGH << CICR_HPIT_SHIFT);
	366	high_active = 1;
	367	}
	368
	369	qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
	370
ec775d0e TG	371	irq_set_handler_data(qe_ic->virq_low, qe_ic);
ec775d0e TG	372	irq_set_chained_handler(qe_ic->virq_low, low_handler);
98658538	373
cccd2102 AV	374	if (qe_ic->virq_high != NO_IRQ &&
cccd2102 AV	375	qe_ic->virq_high != qe_ic->virq_low) {
ec775d0e TG	376	irq_set_handler_data(qe_ic->virq_high, qe_ic);
ec775d0e TG	377	irq_set_chained_handler(qe_ic->virq_high, high_handler);
98658538	378	}
98658538 LY	379	}
	380
	381	void qe_ic_set_highest_priority(unsigned int virq, int high)
	382	{
	383	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	384	unsigned int src = virq_to_hw(virq);
	385	u32 temp = 0;
	386
	387	temp = qe_ic_read(qe_ic->regs, QEIC_CICR);
	388
	389	temp &= ~CICR_HP_MASK;
	390	temp \|= src << CICR_HP_SHIFT;
	391
	392	temp &= ~CICR_HPIT_MASK;
	393	temp \|= (high ? SIGNAL_HIGH : SIGNAL_LOW) << CICR_HPIT_SHIFT;
	394
	395	qe_ic_write(qe_ic->regs, QEIC_CICR, temp);
	396	}
	397
	398	/* Set Priority level within its group, from 1 to 8 */
	399	int qe_ic_set_priority(unsigned int virq, unsigned int priority)
	400	{
	401	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	402	unsigned int src = virq_to_hw(virq);
	403	u32 temp;
	404
	405	if (priority > 8 \|\| priority == 0)
	406	return -EINVAL;
	407	if (src > 127)
	408	return -EINVAL;
	409	if (qe_ic_info[src].pri_reg == 0)
	410	return -EINVAL;
	411
	412	temp = qe_ic_read(qe_ic->regs, qe_ic_info[src].pri_reg);
	413
	414	if (priority < 4) {
	415	temp &= ~(0x7 << (32 - priority * 3));
	416	temp \|= qe_ic_info[src].pri_code << (32 - priority * 3);
	417	} else {
	418	temp &= ~(0x7 << (24 - priority * 3));
	419	temp \|= qe_ic_info[src].pri_code << (24 - priority * 3);
	420	}
	421
	422	qe_ic_write(qe_ic->regs, qe_ic_info[src].pri_reg, temp);
	423
	424	return 0;
	425	}
	426
	427	/* Set a QE priority to use high irq, only priority 1~2 can use high irq */
	428	int qe_ic_set_high_priority(unsigned int virq, unsigned int priority, int high)
	429	{
	430	struct qe_ic *qe_ic = qe_ic_from_irq(virq);
	431	unsigned int src = virq_to_hw(virq);
	432	u32 temp, control_reg = QEIC_CICNR, shift = 0;
	433
	434	if (priority > 2 \|\| priority == 0)
	435	return -EINVAL;
	436
	437	switch (qe_ic_info[src].pri_reg) {
	438	case QEIC_CIPZCC:
	439	shift = CICNR_ZCC1T_SHIFT;
	440	break;
	441	case QEIC_CIPWCC:
	442	shift = CICNR_WCC1T_SHIFT;
443	break;
444	case QEIC_CIPYCC:
445	shift = CICNR_YCC1T_SHIFT;
446	break;
447	case QEIC_CIPXCC:
448	shift = CICNR_XCC1T_SHIFT;
449	break;
450	case QEIC_CIPRTA:
451	shift = CRICR_RTA1T_SHIFT;
452	control_reg = QEIC_CRICR;
453	break;
454	case QEIC_CIPRTB:
455	shift = CRICR_RTB1T_SHIFT;
456	control_reg = QEIC_CRICR;
457	break;
458	default:
459	return -EINVAL;
460	}
461
462	shift += (2 - priority) * 2;
463	temp = qe_ic_read(qe_ic->regs, control_reg);
464	temp &= ~(SIGNAL_MASK << shift);
465	temp \|= (high ? SIGNAL_HIGH : SIGNAL_LOW) << shift;
466	qe_ic_write(qe_ic->regs, control_reg, temp);
467
468	return 0;
469	}
470
cfde779f	471	static struct bus_type qe_ic_subsys = {
af5ca3f4	472	.name = "qe_ic",
cfde779f	473	.dev_name = "qe_ic",
98658538 LY	474	};
98658538 LY	475
cfde779f	476	static struct device device_qe_ic = {
98658538	477	.id = 0,
cfde779f	478	.bus = &qe_ic_subsys,
98658538 LY	479	};
	480
	481	static int __init init_qe_ic_sysfs(void)
	482	{
	483	int rc;
	484
	485	printk(KERN_DEBUG "Registering qe_ic with sysfs...\n");
	486
cfde779f	487	rc = subsys_system_register(&qe_ic_subsys, NULL);
98658538 LY	488	if (rc) {
	489	printk(KERN_ERR "Failed registering qe_ic sys class\n");
	490	return -ENODEV;
	491	}
cfde779f	492	rc = device_register(&device_qe_ic);
98658538 LY	493	if (rc) {
	494	printk(KERN_ERR "Failed registering qe_ic sys device\n");
	495	return -ENODEV;
	496	}
	497	return 0;
	498	}
	499
	500	subsys_initcall(init_qe_ic_sysfs);