Commit dd5e6d6a authored by Thomas Bogendoerfer's avatar Thomas Bogendoerfer Committed by Helge Deller
Browse files

parisc: Fix interrupt routing for C8000 serial ports 



We can't use dev->mod_index for selecting the interrupt routing entry,
because it's not an index into interrupt routing table. It will be even
wrong on a machine with 2 CPUs (4 cores). But all needed information is
contained in the PAT entries for the serial ports. mod[0] contains the
iosapic address and mod_info has some indications for the interrupt
input (at least it looks like it). This patch implements the searching
for the right iosapic and uses this interrupt input information.

Signed-off-by: default avatarThomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: <stable@vger.kernel.org> # 3.10
Signed-off-by: default avatarHelge Deller <deller@gmx.de>
parent 5a0ce2dc

arch/parisc/include/asm/parisc-device.h

+3 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ struct parisc_device { 
	/* generic info returned from pdc_pat_cell_module() */

	unsigned long	mod_info;	/* PAT specific - Misc Module info */

	unsigned long	pmod_loc;	/* physical Module location */

	unsigned long	mod0;

#endif

	u64		dma_mask;	/* DMA mask for I/O */

	struct device 	dev;
@@ -61,4 +62,6 @@ parisc_get_drvdata(struct parisc_device *d) 


extern struct bus_type parisc_bus_type;



int iosapic_serial_irq(struct parisc_device *dev);



#endif /*_ASM_PARISC_PARISC_DEVICE_H_*/

arch/parisc/kernel/inventory.c

+1 −0
Original line number Diff line number Diff line
@@ -211,6 +211,7 @@ pat_query_module(ulong pcell_loc, ulong mod_index) 
	/* REVISIT: who is the consumer of this? not sure yet... */

	dev->mod_info = pa_pdc_cell->mod_info;	/* pass to PAT_GET_ENTITY() */

	dev->pmod_loc = pa_pdc_cell->mod_location;

	dev->mod0 = pa_pdc_cell->mod[0];



	register_parisc_device(dev);	/* advertise device */

drivers/parisc/iosapic.c

+27 −11
Original line number Diff line number Diff line
@@ -811,18 +811,28 @@ int iosapic_fixup_irq(void *isi_obj, struct pci_dev *pcidev) 
	return pcidev->irq;

}



static struct iosapic_info *first_isi = NULL;

static struct iosapic_info *iosapic_list;



#ifdef CONFIG_64BIT

int iosapic_serial_irq(int num)

int iosapic_serial_irq(struct parisc_device *dev)

{

	struct iosapic_info *isi = first_isi;

	struct irt_entry *irte = NULL;  /* only used if PAT PDC */

	struct iosapic_info *isi;

	struct irt_entry *irte;

	struct vector_info *vi;

	int isi_line;	/* line used by device */

	int cnt;

	int intin;



	intin = (dev->mod_info >> 24) & 15;



	/* lookup IRT entry for isi/slot/pin set */

	irte = &irt_cell[num];

	for (cnt = 0; cnt < irt_num_entry; cnt++) {

		irte = &irt_cell[cnt];

		if (COMPARE_IRTE_ADDR(irte, dev->mod0) &&

		    irte->dest_iosapic_intin == intin)

			break;

	}

	if (cnt >= irt_num_entry)

		return 0; /* no irq found, force polling */



	DBG_IRT("iosapic_serial_irq(): irte %p %x %x %x %x %x %x %x %x\n",

		irte,
@@ -834,11 +844,17 @@ int iosapic_serial_irq(int num) 
		irte->src_seg_id,

		irte->dest_iosapic_intin,

		(u32) irte->dest_iosapic_addr);

	isi_line = irte->dest_iosapic_intin;



	/* search for iosapic */

	for (isi = iosapic_list; isi; isi = isi->isi_next)

		if (isi->isi_hpa == dev->mod0)

			break;

	if (!isi)

		return 0; /* no iosapic found, force polling */



	/* get vector info for this input line */

	vi = isi->isi_vector + isi_line;

	DBG_IRT("iosapic_serial_irq:  line %d vi 0x%p\n", isi_line, vi);

	vi = isi->isi_vector + intin;

	DBG_IRT("iosapic_serial_irq:  line %d vi 0x%p\n", iosapic_intin, vi);



	/* If this IRQ line has already been setup, skip it */

	if (vi->irte)
@@ -941,8 +957,8 @@ void *iosapic_register(unsigned long hpa) 
		vip->irqline = (unsigned char) cnt;

		vip->iosapic = isi;

	}

	if (!first_isi)

		first_isi = isi;

	isi->isi_next = iosapic_list;

	iosapic_list = isi;

	return isi;

}

drivers/tty/serial/8250/8250_gsc.c

+1 −2
Original line number Diff line number Diff line
@@ -31,9 +31,8 @@ static int __init serial_init_chip(struct parisc_device *dev) 
	int err;



#ifdef CONFIG_64BIT

	extern int iosapic_serial_irq(int cellnum);

	if (!dev->irq && (dev->id.sversion == 0xad))

		dev->irq = iosapic_serial_irq(dev->mod_index-1);

		dev->irq = iosapic_serial_irq(dev);

#endif



	if (!dev->irq) {

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