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Commit bdaa6e80 authored by Magnus Damm's avatar Magnus Damm Committed by Paul Mundt
Browse files

sh: multiple vectors per irq - base 



Instead of keeping the single vector -> single linux irq mapping
we extend the intc code to support merging of vectors to a single
linux irq. This helps processors such as sh7750, sh7780 and sh7785
which have more vectors than masking ability. With this patch in
place we can modify the intc tables to use one irq per maskable
irq source. Please note the following:

 - If multiple vectors share the same enum then only the
   first vector will be available as a linux irq.

 - Drivers may need to be rewritten to get pending irq
   source from the hardware block instead of irq number.

This patch together with the sh7785 specific intc tables solves
DMA controller irq issues related to buggy interrupt masking.

Reported-by: default avatarYoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: default avatarMagnus Damm <damm@igel.co.jp>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 3e91faec

arch/sh/kernel/irq.c

+1 −1
Original line number Diff line number Diff line
@@ -106,7 +106,7 @@ asmlinkage int do_IRQ(unsigned int irq, struct pt_regs *regs) 
	}

#endif



	irq = irq_demux(evt2irq(irq));

	irq = irq_demux(intc_evt2irq(irq));



#ifdef CONFIG_IRQSTACKS

	curctx = (union irq_ctx *)current_thread_info();

drivers/sh/intc.c

+47 −0
Original line number Diff line number Diff line
@@ -568,6 +568,10 @@ static void __init intc_register_irq(struct intc_desc *desc, 
	if (!data[0] && data[1])

		primary = 1;



	if (!data[0] && !data[1])

		pr_warning("intc: missing unique irq mask for 0x%04x\n",

			   irq2evt(irq));



	data[0] = data[0] ? data[0] : intc_mask_data(desc, d, enum_id, 1);

	data[1] = data[1] ? data[1] : intc_prio_data(desc, d, enum_id, 1);
@@ -641,6 +645,17 @@ static unsigned int __init save_reg(struct intc_desc_int *d, 
	return 0;

}



static unsigned char *intc_evt2irq_table;



unsigned int intc_evt2irq(unsigned int vector)

{

	unsigned int irq = evt2irq(vector);



	if (intc_evt2irq_table && intc_evt2irq_table[irq])

		irq = intc_evt2irq_table[irq];



	return irq;

}



void __init register_intc_controller(struct intc_desc *desc)

{
@@ -705,9 +720,41 @@ void __init register_intc_controller(struct intc_desc *desc) 


	BUG_ON(k > 256); /* _INTC_ADDR_E() and _INTC_ADDR_D() are 8 bits */



	/* keep the first vector only if same enum is used multiple times */

	for (i = 0; i < desc->nr_vectors; i++) {

		struct intc_vect *vect = desc->vectors + i;

		int first_irq = evt2irq(vect->vect);



		if (!vect->enum_id)

			continue;



		for (k = i + 1; k < desc->nr_vectors; k++) {

			struct intc_vect *vect2 = desc->vectors + k;



			if (vect->enum_id != vect2->enum_id)

				continue;



			vect2->enum_id = 0;



			if (!intc_evt2irq_table)

				intc_evt2irq_table = alloc_bootmem(NR_IRQS);



			if (!intc_evt2irq_table) {

				pr_warning("intc: cannot allocate evt2irq!\n");

				continue;

			}



			intc_evt2irq_table[evt2irq(vect2->vect)] = first_irq;

		}

	}



	/* register the vectors one by one */

	for (i = 0; i < desc->nr_vectors; i++) {

		struct intc_vect *vect = desc->vectors + i;



		if (!vect->enum_id)

			continue;



		intc_register_irq(desc, d, vect->enum_id, evt2irq(vect->vect));

	}

}

include/linux/sh_intc.h

+1 −0
Original line number Diff line number Diff line
@@ -85,6 +85,7 @@ struct intc_desc symbol __initdata = { \ 
}

#endif



unsigned int intc_evt2irq(unsigned int vector);

void __init register_intc_controller(struct intc_desc *desc);

int intc_set_priority(unsigned int irq, unsigned int prio);