Commit d22ce25f authored by Gabor Juhos's avatar Gabor Juhos Committed by Ralf Baechle
Browse files

MIPS: ath79: allow to use SoC specific PCI IRQ maps 



The PCI controllers in the AR71XX and in the
AR724X SoCs are different, and both of them
uses different IRQ wiring.

The patch modifies the 'pcibios_map_irq' function
in order to allow to use different IRQ maps for
the different SoCs. The patch also adds a function,
which lets the board setup code to override the
default IRQ map.

Signed-off-by: default avatarGabor Juhos <juhosg@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/3500/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent f8365ec4

arch/mips/ath79/pci.c

+68 −4
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
 *  by the Free Software Foundation.

 */



#include <linux/init.h>

#include <linux/pci.h>

#include <asm/mach-ath79/ath79.h>

#include <asm/mach-ath79/irq.h>
@@ -15,9 +16,35 @@ 
#include "pci.h"



static int (*ath79_pci_plat_dev_init)(struct pci_dev *dev);

static const struct ath79_pci_irq *ath79_pci_irq_map __initdata;

static unsigned ath79_pci_nr_irqs __initdata;

static struct ar724x_pci_data *pci_data;

static int pci_data_size;



static const struct ath79_pci_irq ar71xx_pci_irq_map[] __initconst = {

	{

		.slot	= 17,

		.pin	= 1,

		.irq	= ATH79_PCI_IRQ(0),

	}, {

		.slot	= 18,

		.pin	= 1,

		.irq	= ATH79_PCI_IRQ(1),

	}, {

		.slot	= 19,

		.pin	= 1,

		.irq	= ATH79_PCI_IRQ(2),

	}

};



static const struct ath79_pci_irq ar724x_pci_irq_map[] __initconst = {

	{

		.slot	= 0,

		.pin	= 1,

		.irq	= ATH79_PCI_IRQ(0),

	}

};



void ar724x_pci_add_data(struct ar724x_pci_data *data, int size)

{

	pci_data	= data;
@@ -26,13 +53,40 @@ void ar724x_pci_add_data(struct ar724x_pci_data *data, int size) 


int __init pcibios_map_irq(const struct pci_dev *dev, uint8_t slot, uint8_t pin)

{

	unsigned int devfn = dev->devfn;

	int irq = -1;

	int i;



	if (devfn > pci_data_size - 1)

	if (ath79_pci_nr_irqs == 0 ||

	    ath79_pci_irq_map == NULL) {

		if (soc_is_ar71xx()) {

			ath79_pci_irq_map = ar71xx_pci_irq_map;

			ath79_pci_nr_irqs = ARRAY_SIZE(ar71xx_pci_irq_map);

		} else if (soc_is_ar724x()) {

			ath79_pci_irq_map = ar724x_pci_irq_map;

			ath79_pci_nr_irqs = ARRAY_SIZE(ar724x_pci_irq_map);

		} else {

			pr_crit("pci %s: invalid irq map\n",

				pci_name((struct pci_dev *) dev));

			return irq;

		}

	}



	irq = pci_data[devfn].irq;

	for (i = 0; i < ath79_pci_nr_irqs; i++) {

		const struct ath79_pci_irq *entry;



		entry = &ath79_pci_irq_map[i];

		if (entry->slot == slot && entry->pin == pin) {

			irq = entry->irq;

			break;

		}

	}



	if (irq < 0)

		pr_crit("pci %s: no irq found for pin %u\n",

			pci_name((struct pci_dev *) dev), pin);

	else

		pr_info("pci %s: using irq %d for pin %u\n",

			pci_name((struct pci_dev *) dev), irq, pin);



	return irq;

}
@@ -45,6 +99,13 @@ int pcibios_plat_dev_init(struct pci_dev *dev) 
	return 0;

}



void __init ath79_pci_set_irq_map(unsigned nr_irqs,

				  const struct ath79_pci_irq *map)

{

	ath79_pci_nr_irqs = nr_irqs;

	ath79_pci_irq_map = map;

}



void __init ath79_pci_set_plat_dev_init(int (*func)(struct pci_dev *dev))

{

	ath79_pci_plat_dev_init = func;
@@ -52,6 +113,9 @@ void __init ath79_pci_set_plat_dev_init(int (*func)(struct pci_dev *dev)) 


int __init ath79_register_pci(void)

{

	if (soc_is_ar71xx())

		return ar71xx_pcibios_init();



	if (soc_is_ar724x())

		return ar724x_pcibios_init(ATH79_CPU_IRQ_IP2);

arch/mips/ath79/pci.h

+9 −0
Original line number Diff line number Diff line
@@ -15,13 +15,22 @@ struct ar724x_pci_data { 
	int irq;

};



struct ath79_pci_irq {

	u8	slot;

	u8	pin;

	int	irq;

};



void ar724x_pci_add_data(struct ar724x_pci_data *data, int size);



#ifdef CONFIG_PCI

void ath79_pci_set_irq_map(unsigned nr_irqs, const struct ath79_pci_irq *map);

void ath79_pci_set_plat_dev_init(int (*func)(struct pci_dev *dev));

int ath79_register_pci(void);

#else

static inline void

ath79_pci_set_irq_map(unsigned nr_irqs, const struct ath79_pci_irq *map) {}

static inline void

ath79_pci_set_plat_dev_init(int (*func)(struct pci_dev *)) {}

static inline int ath79_register_pci(void) { return 0; }

#endif

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