[deliverable/linux.git] / arch / powerpc / sysdev / cpm2_pic.c

/*
 * Platform information definitions.
 *
 * Copied from arch/ppc/syslib/cpm2_pic.c with minor subsequent updates
 * to make in work in arch/powerpc/. Original (c) belongs to Dan Malek.
 *
 * Author:  Vitaly Bordug <vbordug@ru.mvista.com>
 *
 * 1999-2001 (c) Dan Malek <dan@embeddedalley.com>
 * 2006 (c) MontaVista Software, Inc.
 *
 * This file is licensed under the terms of the GNU General Public License
 * version 2. This program is licensed "as is" without any warranty of any
 * kind, whether express or implied.
 */

/* The CPM2 internal interrupt controller.  It is usually
 * the only interrupt controller.
 * There are two 32-bit registers (high/low) for up to 64
 * possible interrupts.
 *
 * Now, the fun starts.....Interrupt Numbers DO NOT MAP
 * in a simple arithmetic fashion to mask or pending registers.
 * That is, interrupt 4 does not map to bit position 4.
 * We create two tables, indexed by vector number, to indicate
 * which register to use and which bit in the register to use.
 */

#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/irq.h>

#include <asm/immap_cpm2.h>
#include <asm/mpc8260.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/fs_pd.h>

#include "cpm2_pic.h"

/* External IRQS */
#define CPM2_IRQ_EXT1		19
#define CPM2_IRQ_EXT7		25

/* Port C IRQS */
#define CPM2_IRQ_PORTC15	48
#define CPM2_IRQ_PORTC0		63

static intctl_cpm2_t __iomem *cpm2_intctl;

static struct irq_host *cpm2_pic_host;
#define NR_MASK_WORDS   ((NR_IRQS + 31) / 32)
static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];

static const u_char irq_to_siureg[] = {
	1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1,
	0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0,
	1, 1, 1, 1, 1, 1, 1, 1,
	1, 1, 1, 1, 1, 1, 1, 1,
	0, 0, 0, 0, 0, 0, 0, 0,
	0, 0, 0, 0, 0, 0, 0, 0
};

/* bit numbers do not match the docs, these are precomputed so the bit for
 * a given irq is (1 << irq_to_siubit[irq]) */
static const u_char irq_to_siubit[] = {
	 0, 15, 14, 13, 12, 11, 10,  9,
	 8,  7,  6,  5,  4,  3,  2,  1,
	 2,  1,  0, 14, 13, 12, 11, 10,
	 9,  8,  7,  6,  5,  4,  3,  0,
	31, 30, 29, 28, 27, 26, 25, 24,
	23, 22, 21, 20, 19, 18, 17, 16,
	16, 17, 18, 19, 20, 21, 22, 23,
	24, 25, 26, 27, 28, 29, 30, 31,
};

static void cpm2_mask_irq(unsigned int virq)
{
	int	bit, word;
	unsigned int irq_nr = virq_to_hw(virq);

	bit = irq_to_siubit[irq_nr];
	word = irq_to_siureg[irq_nr];

	ppc_cached_irq_mask[word] &= ~(1 << bit);
	out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
}

static void cpm2_unmask_irq(unsigned int virq)
{
	int	bit, word;
	unsigned int irq_nr = virq_to_hw(virq);

	bit = irq_to_siubit[irq_nr];
	word = irq_to_siureg[irq_nr];

	ppc_cached_irq_mask[word] |= 1 << bit;
	out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
}

static void cpm2_ack(unsigned int virq)
{
	int	bit, word;
	unsigned int irq_nr = virq_to_hw(virq);

	bit = irq_to_siubit[irq_nr];
	word = irq_to_siureg[irq_nr];

	out_be32(&cpm2_intctl->ic_sipnrh + word, 1 << bit);
}

static void cpm2_end_irq(unsigned int virq)
{
	int	bit, word;
	unsigned int irq_nr = virq_to_hw(virq);

	if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
			&& irq_desc[irq_nr].action) {

		bit = irq_to_siubit[irq_nr];
		word = irq_to_siureg[irq_nr];

		ppc_cached_irq_mask[word] |= 1 << bit;
		out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);

		/*
		 * Work around large numbers of spurious IRQs on PowerPC 82xx
		 * systems.
		 */
		mb();
	}
}

static int cpm2_set_irq_type(unsigned int virq, unsigned int flow_type)
{
	unsigned int src = virq_to_hw(virq);
	struct irq_desc *desc = get_irq_desc(virq);
	unsigned int vold, vnew, edibit;

	if (flow_type == IRQ_TYPE_NONE)
		flow_type = IRQ_TYPE_LEVEL_LOW;

	if (flow_type & IRQ_TYPE_EDGE_RISING) {
		printk(KERN_ERR "CPM2 PIC: sense type 0x%x not supported\n",
			flow_type);
		return -EINVAL;
	}

	desc->status &= ~(IRQ_TYPE_SENSE_MASK | IRQ_LEVEL);
	desc->status |= flow_type & IRQ_TYPE_SENSE_MASK;
	if (flow_type & IRQ_TYPE_LEVEL_LOW)  {
		desc->status |= IRQ_LEVEL;
		desc->handle_irq = handle_level_irq;
	} else
		desc->handle_irq = handle_edge_irq;

	/* internal IRQ senses are LEVEL_LOW
	 * EXT IRQ and Port C IRQ senses are programmable
	 */
	if (src >= CPM2_IRQ_EXT1 && src <= CPM2_IRQ_EXT7)
			edibit = (14 - (src - CPM2_IRQ_EXT1));
	else
		if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0)
			edibit = (31 - (CPM2_IRQ_PORTC0 - src));
		else
			return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -EINVAL;

	vold = in_be32(&cpm2_intctl->ic_siexr);

	if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING)
		vnew = vold | (1 << edibit);
	else
		vnew = vold & ~(1 << edibit);

	if (vold != vnew)
		out_be32(&cpm2_intctl->ic_siexr, vnew);
	return 0;
}

static struct irq_chip cpm2_pic = {
	.typename = " CPM2 SIU ",
	.mask = cpm2_mask_irq,
	.unmask = cpm2_unmask_irq,
	.ack = cpm2_ack,
	.eoi = cpm2_end_irq,
	.set_type = cpm2_set_irq_type,
};

unsigned int cpm2_get_irq(void)
{
	int irq;
	unsigned long bits;

       /* For CPM2, read the SIVEC register and shift the bits down
         * to get the irq number.         */
        bits = in_be32(&cpm2_intctl->ic_sivec);
        irq = bits >> 26;

	if (irq == 0)
		return(-1);
	return irq_linear_revmap(cpm2_pic_host, irq);
}

static int cpm2_pic_host_map(struct irq_host *h, unsigned int virq,
			  irq_hw_number_t hw)
{
	pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw);

	get_irq_desc(virq)->status |= IRQ_LEVEL;
	set_irq_chip_and_handler(virq, &cpm2_pic, handle_level_irq);
	return 0;
}

static int cpm2_pic_host_xlate(struct irq_host *h, struct device_node *ct,
			    u32 *intspec, unsigned int intsize,
			    irq_hw_number_t *out_hwirq, unsigned int *out_flags)
{
	*out_hwirq = intspec[0];
	if (intsize > 1)
		*out_flags = intspec[1];
	else
		*out_flags = IRQ_TYPE_NONE;
	return 0;
}

static struct irq_host_ops cpm2_pic_host_ops = {
	.map = cpm2_pic_host_map,
	.xlate = cpm2_pic_host_xlate,
};

void cpm2_pic_init(struct device_node *node)
{
	int i;

	cpm2_intctl = cpm2_map(im_intctl);

	/* Clear the CPM IRQ controller, in case it has any bits set
	 * from the bootloader
	 */

	/* Mask out everything */

	out_be32(&cpm2_intctl->ic_simrh, 0x00000000);
	out_be32(&cpm2_intctl->ic_simrl, 0x00000000);

	wmb();

	/* Ack everything */
	out_be32(&cpm2_intctl->ic_sipnrh, 0xffffffff);
	out_be32(&cpm2_intctl->ic_sipnrl, 0xffffffff);
	wmb();

	/* Dummy read of the vector */
	i = in_be32(&cpm2_intctl->ic_sivec);
	rmb();

	/* Initialize the default interrupt mapping priorities,
	 * in case the boot rom changed something on us.
	 */
	out_be16(&cpm2_intctl->ic_sicr, 0);
	out_be32(&cpm2_intctl->ic_scprrh, 0x05309770);
	out_be32(&cpm2_intctl->ic_scprrl, 0x05309770);

	/* create a legacy host */
	cpm2_pic_host = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
				       64, &cpm2_pic_host_ops, 64);
	if (cpm2_pic_host == NULL) {
		printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
		return;
	}
}
Commit	Line	Data
b0c110b4 VB	1	/*
	2	* Platform information definitions.
	3	*
	4	* Copied from arch/ppc/syslib/cpm2_pic.c with minor subsequent updates
	5	* to make in work in arch/powerpc/. Original (c) belongs to Dan Malek.
	6	*
	7	* Author: Vitaly Bordug <vbordug@ru.mvista.com>
	8	*
	9	* 1999-2001 (c) Dan Malek <dan@embeddedalley.com>
	10	* 2006 (c) MontaVista Software, Inc.
	11	*
	12	* This file is licensed under the terms of the GNU General Public License
	13	* version 2. This program is licensed "as is" without any warranty of any
	14	* kind, whether express or implied.
	15	*/
	16
	17	/* The CPM2 internal interrupt controller. It is usually
	18	* the only interrupt controller.
	19	* There are two 32-bit registers (high/low) for up to 64
	20	* possible interrupts.
	21	*
	22	* Now, the fun starts.....Interrupt Numbers DO NOT MAP
	23	* in a simple arithmetic fashion to mask or pending registers.
	24	* That is, interrupt 4 does not map to bit position 4.
	25	* We create two tables, indexed by vector number, to indicate
	26	* which register to use and which bit in the register to use.
	27	*/
	28
	29	#include <linux/stddef.h>
	30	#include <linux/init.h>
	31	#include <linux/sched.h>
	32	#include <linux/signal.h>
	33	#include <linux/irq.h>
	34
	35	#include <asm/immap_cpm2.h>
	36	#include <asm/mpc8260.h>
	37	#include <asm/io.h>
	38	#include <asm/prom.h>
73844ecb	39	#include <asm/fs_pd.h>
b0c110b4 VB	40
	41	#include "cpm2_pic.h"
	42
73844ecb VB	43	/* External IRQS */
	44	#define CPM2_IRQ_EXT1 19
	45	#define CPM2_IRQ_EXT7 25
	46
	47	/* Port C IRQS */
	48	#define CPM2_IRQ_PORTC15 48
	49	#define CPM2_IRQ_PORTC0 63
	50
449012da	51	static intctl_cpm2_t __iomem *cpm2_intctl;
73844ecb	52
b0c110b4 VB	53	static struct irq_host *cpm2_pic_host;
	54	#define NR_MASK_WORDS ((NR_IRQS + 31) / 32)
	55	static unsigned long ppc_cached_irq_mask[NR_MASK_WORDS];
	56
	57	static const u_char irq_to_siureg[] = {
	58	1, 1, 1, 1, 1, 1, 1, 1,
	59	1, 1, 1, 1, 1, 1, 1, 1,
	60	0, 0, 0, 0, 0, 0, 0, 0,
	61	0, 0, 0, 0, 0, 0, 0, 0,
	62	1, 1, 1, 1, 1, 1, 1, 1,
	63	1, 1, 1, 1, 1, 1, 1, 1,
	64	0, 0, 0, 0, 0, 0, 0, 0,
	65	0, 0, 0, 0, 0, 0, 0, 0
	66	};
	67
	68	/* bit numbers do not match the docs, these are precomputed so the bit for
	69	* a given irq is (1 << irq_to_siubit[irq]) */
	70	static const u_char irq_to_siubit[] = {
	71	0, 15, 14, 13, 12, 11, 10, 9,
	72	8, 7, 6, 5, 4, 3, 2, 1,
	73	2, 1, 0, 14, 13, 12, 11, 10,
	74	9, 8, 7, 6, 5, 4, 3, 0,
	75	31, 30, 29, 28, 27, 26, 25, 24,
	76	23, 22, 21, 20, 19, 18, 17, 16,
	77	16, 17, 18, 19, 20, 21, 22, 23,
	78	24, 25, 26, 27, 28, 29, 30, 31,
	79	};
	80
73844ecb	81	static void cpm2_mask_irq(unsigned int virq)
b0c110b4 VB	82	{
b0c110b4 VB	83	int bit, word;
73844ecb	84	unsigned int irq_nr = virq_to_hw(virq);
b0c110b4 VB	85
	86	bit = irq_to_siubit[irq_nr];
	87	word = irq_to_siureg[irq_nr];
	88
b0c110b4	89	ppc_cached_irq_mask[word] &= ~(1 << bit);
73844ecb	90	out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
b0c110b4 VB	91	}
b0c110b4 VB	92
73844ecb	93	static void cpm2_unmask_irq(unsigned int virq)
b0c110b4 VB	94	{
b0c110b4 VB	95	int bit, word;
73844ecb	96	unsigned int irq_nr = virq_to_hw(virq);
b0c110b4 VB	97
	98	bit = irq_to_siubit[irq_nr];
	99	word = irq_to_siureg[irq_nr];
	100
b0c110b4	101	ppc_cached_irq_mask[word] \|= 1 << bit;
73844ecb	102	out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
b0c110b4 VB	103	}
b0c110b4 VB	104
73844ecb	105	static void cpm2_ack(unsigned int virq)
b0c110b4 VB	106	{
b0c110b4 VB	107	int bit, word;
73844ecb	108	unsigned int irq_nr = virq_to_hw(virq);
b0c110b4 VB	109
	110	bit = irq_to_siubit[irq_nr];
	111	word = irq_to_siureg[irq_nr];
	112
73844ecb	113	out_be32(&cpm2_intctl->ic_sipnrh + word, 1 << bit);
b0c110b4 VB	114	}
b0c110b4 VB	115
73844ecb	116	static void cpm2_end_irq(unsigned int virq)
b0c110b4 VB	117	{
b0c110b4 VB	118	int bit, word;
73844ecb	119	unsigned int irq_nr = virq_to_hw(virq);
b0c110b4 VB	120
	121	if (!(irq_desc[irq_nr].status & (IRQ_DISABLED\|IRQ_INPROGRESS))
	122	&& irq_desc[irq_nr].action) {
	123
b0c110b4 VB	124	bit = irq_to_siubit[irq_nr];
	125	word = irq_to_siureg[irq_nr];
	126
b0c110b4	127	ppc_cached_irq_mask[word] \|= 1 << bit;
73844ecb VB	128	out_be32(&cpm2_intctl->ic_simrh + word, ppc_cached_irq_mask[word]);
73844ecb VB	129
b0c110b4 VB	130	/*
	131	* Work around large numbers of spurious IRQs on PowerPC 82xx
	132	* systems.
	133	*/
	134	mb();
	135	}
	136	}
	137
73844ecb VB	138	static int cpm2_set_irq_type(unsigned int virq, unsigned int flow_type)
	139	{
	140	unsigned int src = virq_to_hw(virq);
	141	struct irq_desc *desc = get_irq_desc(virq);
	142	unsigned int vold, vnew, edibit;
	143
	144	if (flow_type == IRQ_TYPE_NONE)
	145	flow_type = IRQ_TYPE_LEVEL_LOW;
	146
	147	if (flow_type & IRQ_TYPE_EDGE_RISING) {
	148	printk(KERN_ERR "CPM2 PIC: sense type 0x%x not supported\n",
	149	flow_type);
	150	return -EINVAL;
	151	}
	152
	153	desc->status &= ~(IRQ_TYPE_SENSE_MASK \| IRQ_LEVEL);
	154	desc->status \|= flow_type & IRQ_TYPE_SENSE_MASK;
	155	if (flow_type & IRQ_TYPE_LEVEL_LOW) {
	156	desc->status \|= IRQ_LEVEL;
	157	desc->handle_irq = handle_level_irq;
	158	} else
	159	desc->handle_irq = handle_edge_irq;
	160
	161	/* internal IRQ senses are LEVEL_LOW
	162	* EXT IRQ and Port C IRQ senses are programmable
	163	*/
	164	if (src >= CPM2_IRQ_EXT1 && src <= CPM2_IRQ_EXT7)
	165	edibit = (14 - (src - CPM2_IRQ_EXT1));
	166	else
	167	if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0)
7f3ea17f	168	edibit = (31 - (CPM2_IRQ_PORTC0 - src));
73844ecb VB	169	else
	170	return (flow_type & IRQ_TYPE_LEVEL_LOW) ? 0 : -EINVAL;
	171
	172	vold = in_be32(&cpm2_intctl->ic_siexr);
	173
	174	if ((flow_type & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_EDGE_FALLING)
	175	vnew = vold \| (1 << edibit);
	176	else
	177	vnew = vold & ~(1 << edibit);
	178
	179	if (vold != vnew)
	180	out_be32(&cpm2_intctl->ic_siexr, vnew);
	181	return 0;
	182	}
	183
b0c110b4 VB	184	static struct irq_chip cpm2_pic = {
b0c110b4 VB	185	.typename = " CPM2 SIU ",
73844ecb	186	.mask = cpm2_mask_irq,
b0c110b4	187	.unmask = cpm2_unmask_irq,
73844ecb VB	188	.ack = cpm2_ack,
	189	.eoi = cpm2_end_irq,
	190	.set_type = cpm2_set_irq_type,
b0c110b4 VB	191	};
b0c110b4 VB	192
35a84c2f	193	unsigned int cpm2_get_irq(void)
b0c110b4 VB	194	{
	195	int irq;
	196	unsigned long bits;
	197
fc8e50e3 VB	198	/* For CPM2, read the SIVEC register and shift the bits down
fc8e50e3 VB	199	* to get the irq number. */
73844ecb	200	bits = in_be32(&cpm2_intctl->ic_sivec);
fc8e50e3	201	irq = bits >> 26;
b0c110b4 VB	202
	203	if (irq == 0)
	204	return(-1);
73844ecb	205	return irq_linear_revmap(cpm2_pic_host, irq);
b0c110b4 VB	206	}
b0c110b4 VB	207
b0c110b4 VB	208	static int cpm2_pic_host_map(struct irq_host *h, unsigned int virq,
	209	irq_hw_number_t hw)
	210	{
	211	pr_debug("cpm2_pic_host_map(%d, 0x%lx)\n", virq, hw);
	212
	213	get_irq_desc(virq)->status \|= IRQ_LEVEL;
	214	set_irq_chip_and_handler(virq, &cpm2_pic, handle_level_irq);
	215	return 0;
	216	}
	217
b0c110b4 VB	218	static int cpm2_pic_host_xlate(struct irq_host h, struct device_node ct,
	219	u32 *intspec, unsigned int intsize,
	220	irq_hw_number_t out_hwirq, unsigned int out_flags)
	221	{
b0c110b4	222	*out_hwirq = intspec[0];
73844ecb VB	223	if (intsize > 1)
73844ecb VB	224	*out_flags = intspec[1];
b0c110b4 VB	225	else
b0c110b4 VB	226	*out_flags = IRQ_TYPE_NONE;
b0c110b4 VB	227	return 0;
	228	}
	229
	230	static struct irq_host_ops cpm2_pic_host_ops = {
b0c110b4	231	.map = cpm2_pic_host_map,
b0c110b4 VB	232	.xlate = cpm2_pic_host_xlate,
	233	};
	234
	235	void cpm2_pic_init(struct device_node *node)
	236	{
	237	int i;
	238
73844ecb VB	239	cpm2_intctl = cpm2_map(im_intctl);
73844ecb VB	240
b0c110b4 VB	241	/* Clear the CPM IRQ controller, in case it has any bits set
	242	* from the bootloader
	243	*/
	244
	245	/* Mask out everything */
	246
73844ecb VB	247	out_be32(&cpm2_intctl->ic_simrh, 0x00000000);
73844ecb VB	248	out_be32(&cpm2_intctl->ic_simrl, 0x00000000);
b0c110b4 VB	249
	250	wmb();
	251
	252	/* Ack everything */
73844ecb VB	253	out_be32(&cpm2_intctl->ic_sipnrh, 0xffffffff);
73844ecb VB	254	out_be32(&cpm2_intctl->ic_sipnrl, 0xffffffff);
b0c110b4 VB	255	wmb();
	256
	257	/* Dummy read of the vector */
73844ecb	258	i = in_be32(&cpm2_intctl->ic_sivec);
b0c110b4 VB	259	rmb();
	260
	261	/* Initialize the default interrupt mapping priorities,
	262	* in case the boot rom changed something on us.
	263	*/
73844ecb VB	264	out_be16(&cpm2_intctl->ic_sicr, 0);
	265	out_be32(&cpm2_intctl->ic_scprrh, 0x05309770);
	266	out_be32(&cpm2_intctl->ic_scprrl, 0x05309770);
b0c110b4 VB	267
b0c110b4 VB	268	/* create a legacy host */
19fc65b5	269	cpm2_pic_host = irq_alloc_host(node, IRQ_HOST_MAP_LINEAR,
52964f87	270	64, &cpm2_pic_host_ops, 64);
b0c110b4 VB	271	if (cpm2_pic_host == NULL) {
	272	printk(KERN_ERR "CPM2 PIC: failed to allocate irq host!\n");
	273	return;
	274	}
	275	}