Commit a959ff56 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Paul Mackerras
Browse files

[POWERPC] Improve MPIC driver auto-configuration from DT 



This patch applies on top of the MPIC DCR support. It makes the MPIC
driver capable of a lot more auto-configuration based on the device-tree,
for example, it can retreive it's own physical address if not passed as
an argument, find out if it's DCR or MMIO mapped, and set the BIG_ENDIAN
flag automatically in the presence of a "big-endian" property in the
device-tree node.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent fbf0274e

arch/powerpc/sysdev/mpic.c

+37 −13
Original line number Diff line number Diff line
@@ -894,7 +894,7 @@ static struct irq_host_ops mpic_host_ops = { 
 */



struct mpic * __init mpic_alloc(struct device_node *node,

				unsigned long phys_addr,

				phys_addr_t phys_addr,

				unsigned int flags,

				unsigned int isu_size,

				unsigned int irq_count,
@@ -904,6 +904,7 @@ struct mpic * __init mpic_alloc(struct device_node *node, 
	u32		reg;

	const char	*vers;

	int		i;

	u64		paddr = phys_addr;



	mpic = alloc_bootmem(sizeof(struct mpic));

	if (mpic == NULL)
@@ -943,6 +944,11 @@ struct mpic * __init mpic_alloc(struct device_node *node, 
	mpic->irq_count = irq_count;

	mpic->num_sources = 0; /* so far */



	/* Check for "big-endian" in device-tree */

	if (node && get_property(node, "big-endian", NULL) != NULL)

		mpic->flags |= MPIC_BIG_ENDIAN;





#ifdef CONFIG_MPIC_WEIRD

	mpic->hw_set = mpic_infos[MPIC_GET_REGSET(flags)];

#endif
@@ -951,11 +957,17 @@ struct mpic * __init mpic_alloc(struct device_node *node, 
	mpic->reg_type = (flags & MPIC_BIG_ENDIAN) ?

		mpic_access_mmio_be : mpic_access_mmio_le;



	/* If no physical address is passed in, a device-node is mandatory */

	BUG_ON(paddr == 0 && node == NULL);



	/* If no physical address passed in, check if it's dcr based */

	if (paddr == 0 && get_property(node, "dcr-reg", NULL) != NULL)

		mpic->flags |= MPIC_USES_DCR;



#ifdef CONFIG_PPC_DCR

	if (mpic->flags & MPIC_USES_DCR) {

		const u32 *dbasep;

		BUG_ON(mpic->of_node == NULL);

		dbasep = get_property(mpic->of_node, "dcr-reg", NULL);

		dbasep = get_property(node, "dcr-reg", NULL);

		BUG_ON(dbasep == NULL);

		mpic->dcr_base = *dbasep;

		mpic->reg_type = mpic_access_dcr;
@@ -964,9 +976,20 @@ struct mpic * __init mpic_alloc(struct device_node *node, 
	BUG_ON (mpic->flags & MPIC_USES_DCR);

#endif /* CONFIG_PPC_DCR */



	/* If the MPIC is not DCR based, and no physical address was passed

	 * in, try to obtain one

	 */

	if (paddr == 0 && !(mpic->flags & MPIC_USES_DCR)) {

		const u32 *reg;

		reg = get_property(node, "reg", NULL);

		BUG_ON(reg == NULL);

		paddr = of_translate_address(node, reg);

		BUG_ON(paddr == OF_BAD_ADDR);

	}



	/* Map the global registers */

	mpic_map(mpic, phys_addr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);

	mpic_map(mpic, phys_addr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);

	mpic_map(mpic, paddr, &mpic->gregs, MPIC_INFO(GREG_BASE), 0x1000);

	mpic_map(mpic, paddr, &mpic->tmregs, MPIC_INFO(TIMER_BASE), 0x1000);



	/* Reset */

	if (flags & MPIC_WANTS_RESET) {
@@ -991,7 +1014,7 @@ struct mpic * __init mpic_alloc(struct device_node *node, 


	/* Map the per-CPU registers */

	for (i = 0; i < mpic->num_cpus; i++) {

		mpic_map(mpic, phys_addr, &mpic->cpuregs[i],

		mpic_map(mpic, paddr, &mpic->cpuregs[i],

			 MPIC_INFO(CPU_BASE) + i * MPIC_INFO(CPU_STRIDE),

			 0x1000);

	}
@@ -999,7 +1022,7 @@ struct mpic * __init mpic_alloc(struct device_node *node, 
	/* Initialize main ISU if none provided */

	if (mpic->isu_size == 0) {

		mpic->isu_size = mpic->num_sources;

		mpic_map(mpic, phys_addr, &mpic->isus[0],

		mpic_map(mpic, paddr, &mpic->isus[0],

			 MPIC_INFO(IRQ_BASE), MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);

	}

	mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1);
@@ -1020,10 +1043,11 @@ struct mpic * __init mpic_alloc(struct device_node *node, 
		vers = "<unknown>";

		break;

	}

	printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n",

	       name, vers, phys_addr, mpic->num_cpus);

	printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size,

	       mpic->isu_shift, mpic->isu_mask);

	printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %llx,"

	       " max %d CPUs\n",

	       name, vers, (unsigned long long)paddr, mpic->num_cpus);

	printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n",

	       mpic->isu_size, mpic->isu_shift, mpic->isu_mask);



	mpic->next = mpics;

	mpics = mpic;
@@ -1037,13 +1061,13 @@ struct mpic * __init mpic_alloc(struct device_node *node, 
}



void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,

			    unsigned long phys_addr)

			    phys_addr_t paddr)

{

	unsigned int isu_first = isu_num * mpic->isu_size;



	BUG_ON(isu_num >= MPIC_MAX_ISU);



	mpic_map(mpic, phys_addr, &mpic->isus[isu_num], 0,

	mpic_map(mpic, paddr, &mpic->isus[isu_num], 0,

		 MPIC_INFO(IRQ_STRIDE) * mpic->isu_size);

	if ((isu_first + mpic->isu_size) > mpic->num_sources)

		mpic->num_sources = isu_first + mpic->isu_size;

include/asm-powerpc/mpic.h

+2 −2
Original line number Diff line number Diff line
@@ -364,7 +364,7 @@ struct mpic 
 * that is senses[0] correspond to linux irq "irq_offset".

 */

extern struct mpic *mpic_alloc(struct device_node *node,

			       unsigned long phys_addr,

			       phys_addr_t phys_addr,

			       unsigned int flags,

			       unsigned int isu_size,

			       unsigned int irq_count,
@@ -377,7 +377,7 @@ extern struct mpic *mpic_alloc(struct device_node *node, 
 * @phys_addr:	physical address of the ISU

 */

extern void mpic_assign_isu(struct mpic *mpic, unsigned int isu_num,

			    unsigned long phys_addr);

			    phys_addr_t phys_addr);



/* Set default sense codes

 *

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