arch/powerpc/sysdev/cpm2_pic.c - linux - Git at Google

 /*
  * 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)
 {
 	struct irq_desc *desc;
 	int	bit, word;
 	unsigned int irq_nr = virq_to_hw(virq);

 	desc = irq_to_desc(irq_nr);
 	if (!(desc->status & (IRQ_DISABLED|IRQ_INPROGRESS))
 			&& desc->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 = irq_to_desc(virq);
 	unsigned int vold, vnew, edibit;

 	/* Port C interrupts are either IRQ_TYPE_EDGE_FALLING or
 	 * IRQ_TYPE_EDGE_BOTH (default).  All others are IRQ_TYPE_EDGE_FALLING
 	 * or IRQ_TYPE_LEVEL_LOW (default)
 	 */
 	if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0) {
 		if (flow_type == IRQ_TYPE_NONE)
 			flow_type = IRQ_TYPE_EDGE_BOTH;

 		if (flow_type != IRQ_TYPE_EDGE_BOTH &&
 		    flow_type != IRQ_TYPE_EDGE_FALLING)
 			goto err_sense;
 	} else {
 		if (flow_type == IRQ_TYPE_NONE)
 			flow_type = IRQ_TYPE_LEVEL_LOW;

 		if (flow_type & (IRQ_TYPE_EDGE_RISING | IRQ_TYPE_LEVEL_HIGH))
 			goto err_sense;
 	}

 	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;

 err_sense:
 	pr_err("CPM2 PIC: sense type 0x%x not supported\n", flow_type);
 	return -EINVAL;
 }

 static struct irq_chip cpm2_pic = {
 	.name = " 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);

 	irq_to_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,
 			    const 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;
 	}
 }
	/*
	* 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)
	{
	struct irq_desc *desc;
	int bit, word;
	unsigned int irq_nr = virq_to_hw(virq);

	desc = irq_to_desc(irq_nr);
	if (!(desc->status & (IRQ_DISABLED\|IRQ_INPROGRESS))
	&& desc->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 = irq_to_desc(virq);
	unsigned int vold, vnew, edibit;

	/* Port C interrupts are either IRQ_TYPE_EDGE_FALLING or
	* IRQ_TYPE_EDGE_BOTH (default). All others are IRQ_TYPE_EDGE_FALLING
	* or IRQ_TYPE_LEVEL_LOW (default)
	*/
	if (src >= CPM2_IRQ_PORTC15 && src <= CPM2_IRQ_PORTC0) {
	if (flow_type == IRQ_TYPE_NONE)
	flow_type = IRQ_TYPE_EDGE_BOTH;

	if (flow_type != IRQ_TYPE_EDGE_BOTH &&
	flow_type != IRQ_TYPE_EDGE_FALLING)
	goto err_sense;
	} else {
	if (flow_type == IRQ_TYPE_NONE)
	flow_type = IRQ_TYPE_LEVEL_LOW;

	if (flow_type & (IRQ_TYPE_EDGE_RISING \| IRQ_TYPE_LEVEL_HIGH))
	goto err_sense;
	}

	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;

	err_sense:
	pr_err("CPM2 PIC: sense type 0x%x not supported\n", flow_type);
	return -EINVAL;
	}

	static struct irq_chip cpm2_pic = {
	.name = " 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);

	irq_to_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,
	const 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;
	}
	}