[deliverable/linux.git] / drivers / pci / msi-altix.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2006 Silicon Graphics, Inc.  All Rights Reserved.
 */

#include <linux/types.h>
#include <linux/pci.h>
#include <linux/cpumask.h>

#include <asm/sn/addrs.h>
#include <asm/sn/intr.h>
#include <asm/sn/pcibus_provider_defs.h>
#include <asm/sn/pcidev.h>
#include <asm/sn/nodepda.h>

#include "msi.h"

struct sn_msi_info {
	u64 pci_addr;
	struct sn_irq_info *sn_irq_info;
};

static struct sn_msi_info *sn_msi_info;

static void
sn_msi_teardown(unsigned int irq)
{
	nasid_t nasid;
	int widget;
	struct pci_dev *pdev;
	struct pcidev_info *sn_pdev;
	struct sn_irq_info *sn_irq_info;
	struct pcibus_bussoft *bussoft;
	struct sn_pcibus_provider *provider;

	sn_irq_info = sn_msi_info[irq].sn_irq_info;
	if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
		return;

	sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
	pdev = sn_pdev->pdi_linux_pcidev;
	provider = SN_PCIDEV_BUSPROVIDER(pdev);

	(*provider->dma_unmap)(pdev,
			       sn_msi_info[irq].pci_addr,
			       PCI_DMA_FROMDEVICE);
	sn_msi_info[irq].pci_addr = 0;

	bussoft = SN_PCIDEV_BUSSOFT(pdev);
	nasid = NASID_GET(bussoft->bs_base);
	widget = (nasid & 1) ?
			TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
			SWIN_WIDGETNUM(bussoft->bs_base);

	sn_intr_free(nasid, widget, sn_irq_info);
	sn_msi_info[irq].sn_irq_info = NULL;

	return;
}

int
sn_msi_setup(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg)
{
	int widget;
	int status;
	nasid_t nasid;
	u64 bus_addr;
	struct sn_irq_info *sn_irq_info;
	struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
	struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);

	if (bussoft == NULL)
		return -EINVAL;

	if (provider == NULL || provider->dma_map_consistent == NULL)
		return -EINVAL;

	/*
	 * Set up the vector plumbing.  Let the prom (via sn_intr_alloc)
	 * decide which cpu to direct this msi at by default.
	 */

	nasid = NASID_GET(bussoft->bs_base);
	widget = (nasid & 1) ?
			TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
			SWIN_WIDGETNUM(bussoft->bs_base);

	sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
	if (! sn_irq_info)
		return -ENOMEM;

	status = sn_intr_alloc(nasid, widget, sn_irq_info, irq, -1, -1);
	if (status) {
		kfree(sn_irq_info);
		return -ENOMEM;
	}

	sn_irq_info->irq_int_bit = -1;		/* mark this as an MSI irq */
	sn_irq_fixup(pdev, sn_irq_info);

	/* Prom probably should fill these in, but doesn't ... */
	sn_irq_info->irq_bridge_type = bussoft->bs_asic_type;
	sn_irq_info->irq_bridge = (void *)bussoft->bs_base;

	/*
	 * Map the xio address into bus space
	 */
	bus_addr = (*provider->dma_map_consistent)(pdev,
					sn_irq_info->irq_xtalkaddr,
					sizeof(sn_irq_info->irq_xtalkaddr),
					SN_DMA_MSI|SN_DMA_ADDR_XIO);
	if (! bus_addr) {
		sn_intr_free(nasid, widget, sn_irq_info);
		kfree(sn_irq_info);
		return -ENOMEM;
	}

	sn_msi_info[irq].sn_irq_info = sn_irq_info;
	sn_msi_info[irq].pci_addr = bus_addr;

	msg->address_hi = (u32)(bus_addr >> 32);
	msg->address_lo = (u32)(bus_addr & 0x00000000ffffffff);

	/*
	 * In the SN platform, bit 16 is a "send vector" bit which
	 * must be present in order to move the vector through the system.
	 */
	msg->data = 0x100 + irq;

#ifdef CONFIG_SMP
	set_irq_affinity_info(irq, sn_irq_info->irq_cpuid, 0);
#endif

	return 0;
}

static void
sn_msi_target(unsigned int irq, cpumask_t cpu_mask, struct msi_msg *msg)
{
	int slice;
	nasid_t nasid;
	u64 bus_addr;
	struct pci_dev *pdev;
	struct pcidev_info *sn_pdev;
	struct sn_irq_info *sn_irq_info;
	struct sn_irq_info *new_irq_info;
	struct sn_pcibus_provider *provider;
	unsigned int cpu;

	cpu = first_cpu(cpu_mask);
	sn_irq_info = sn_msi_info[irq].sn_irq_info;
	if (sn_irq_info == NULL || sn_irq_info->irq_int_bit >= 0)
		return;

	/*
	 * Release XIO resources for the old MSI PCI address
	 */

        sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
	pdev = sn_pdev->pdi_linux_pcidev;
	provider = SN_PCIDEV_BUSPROVIDER(pdev);

	bus_addr = (u64)(msg->address_hi) << 32 | (u64)(msg->address_lo);
	(*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
	sn_msi_info[irq].pci_addr = 0;

	nasid = cpuid_to_nasid(cpu);
	slice = cpuid_to_slice(cpu);

	new_irq_info = sn_retarget_vector(sn_irq_info, nasid, slice);
	sn_msi_info[irq].sn_irq_info = new_irq_info;
	if (new_irq_info == NULL)
		return;

	/*
	 * Map the xio address into bus space
	 */

	bus_addr = (*provider->dma_map_consistent)(pdev,
					new_irq_info->irq_xtalkaddr,
					sizeof(new_irq_info->irq_xtalkaddr),
					SN_DMA_MSI|SN_DMA_ADDR_XIO);

	sn_msi_info[irq].pci_addr = bus_addr;
	msg->address_hi = (u32)(bus_addr >> 32);
	msg->address_lo = (u32)(bus_addr & 0x00000000ffffffff);
}

struct msi_ops sn_msi_ops = {
	.needs_64bit_address = 1,
	.setup = sn_msi_setup,
	.teardown = sn_msi_teardown,
#ifdef CONFIG_SMP
	.target = sn_msi_target,
#endif
};

int
sn_msi_init(void)
{
	sn_msi_info =
		kzalloc(sizeof(struct sn_msi_info) * NR_IRQS, GFP_KERNEL);
	if (! sn_msi_info)
		return -ENOMEM;

	msi_register(&sn_msi_ops);
	return 0;
}
Commit	Line	Data
fd58e55f MM	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 2006 Silicon Graphics, Inc. All Rights Reserved.
	7	*/
	8
83821d3f MM	9	#include <linux/types.h>
	10	#include <linux/pci.h>
	11	#include <linux/cpumask.h>
	12
	13	#include <asm/sn/addrs.h>
	14	#include <asm/sn/intr.h>
	15	#include <asm/sn/pcibus_provider_defs.h>
	16	#include <asm/sn/pcidev.h>
	17	#include <asm/sn/nodepda.h>
	18
	19	#include "msi.h"
	20
	21	struct sn_msi_info {
	22	u64 pci_addr;
	23	struct sn_irq_info *sn_irq_info;
	24	};
	25
	26	static struct sn_msi_info *sn_msi_info;
	27
	28	static void
38bc0361	29	sn_msi_teardown(unsigned int irq)
83821d3f MM	30	{
	31	nasid_t nasid;
	32	int widget;
	33	struct pci_dev *pdev;
	34	struct pcidev_info *sn_pdev;
	35	struct sn_irq_info *sn_irq_info;
	36	struct pcibus_bussoft *bussoft;
	37	struct sn_pcibus_provider *provider;
	38
38bc0361	39	sn_irq_info = sn_msi_info[irq].sn_irq_info;
83821d3f MM	40	if (sn_irq_info == NULL \|\| sn_irq_info->irq_int_bit >= 0)
	41	return;
	42
	43	sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
	44	pdev = sn_pdev->pdi_linux_pcidev;
	45	provider = SN_PCIDEV_BUSPROVIDER(pdev);
	46
	47	(*provider->dma_unmap)(pdev,
38bc0361	48	sn_msi_info[irq].pci_addr,
83821d3f	49	PCI_DMA_FROMDEVICE);
38bc0361	50	sn_msi_info[irq].pci_addr = 0;
83821d3f MM	51
	52	bussoft = SN_PCIDEV_BUSSOFT(pdev);
	53	nasid = NASID_GET(bussoft->bs_base);
	54	widget = (nasid & 1) ?
	55	TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
	56	SWIN_WIDGETNUM(bussoft->bs_base);
	57
	58	sn_intr_free(nasid, widget, sn_irq_info);
38bc0361	59	sn_msi_info[irq].sn_irq_info = NULL;
83821d3f MM	60
	61	return;
	62	}
fd58e55f MM	63
fd58e55f MM	64	int
38bc0361	65	sn_msi_setup(struct pci_dev pdev, unsigned int irq, struct msi_msg msg)
fd58e55f	66	{
83821d3f MM	67	int widget;
	68	int status;
	69	nasid_t nasid;
	70	u64 bus_addr;
	71	struct sn_irq_info *sn_irq_info;
	72	struct pcibus_bussoft *bussoft = SN_PCIDEV_BUSSOFT(pdev);
	73	struct sn_pcibus_provider *provider = SN_PCIDEV_BUSPROVIDER(pdev);
	74
	75	if (bussoft == NULL)
	76	return -EINVAL;
	77
	78	if (provider == NULL \|\| provider->dma_map_consistent == NULL)
	79	return -EINVAL;
	80
	81	/*
	82	* Set up the vector plumbing. Let the prom (via sn_intr_alloc)
	83	* decide which cpu to direct this msi at by default.
	84	*/
	85
	86	nasid = NASID_GET(bussoft->bs_base);
	87	widget = (nasid & 1) ?
	88	TIO_SWIN_WIDGETNUM(bussoft->bs_base) :
	89	SWIN_WIDGETNUM(bussoft->bs_base);
	90
	91	sn_irq_info = kzalloc(sizeof(struct sn_irq_info), GFP_KERNEL);
	92	if (! sn_irq_info)
	93	return -ENOMEM;
	94
38bc0361	95	status = sn_intr_alloc(nasid, widget, sn_irq_info, irq, -1, -1);
83821d3f MM	96	if (status) {
	97	kfree(sn_irq_info);
	98	return -ENOMEM;
	99	}
	100
	101	sn_irq_info->irq_int_bit = -1; /* mark this as an MSI irq */
	102	sn_irq_fixup(pdev, sn_irq_info);
	103
	104	/* Prom probably should fill these in, but doesn't ... */
	105	sn_irq_info->irq_bridge_type = bussoft->bs_asic_type;
	106	sn_irq_info->irq_bridge = (void *)bussoft->bs_base;
	107
fd58e55f	108	/*
83821d3f	109	* Map the xio address into bus space
fd58e55f	110	*/
83821d3f MM	111	bus_addr = (*provider->dma_map_consistent)(pdev,
	112	sn_irq_info->irq_xtalkaddr,
	113	sizeof(sn_irq_info->irq_xtalkaddr),
	114	SN_DMA_MSI\|SN_DMA_ADDR_XIO);
	115	if (! bus_addr) {
	116	sn_intr_free(nasid, widget, sn_irq_info);
	117	kfree(sn_irq_info);
	118	return -ENOMEM;
	119	}
	120
38bc0361 EB	121	sn_msi_info[irq].sn_irq_info = sn_irq_info;
38bc0361 EB	122	sn_msi_info[irq].pci_addr = bus_addr;
83821d3f	123
38bc0361 EB	124	msg->address_hi = (u32)(bus_addr >> 32);
38bc0361 EB	125	msg->address_lo = (u32)(bus_addr & 0x00000000ffffffff);
83821d3f MM	126
	127	/*
	128	* In the SN platform, bit 16 is a "send vector" bit which
	129	* must be present in order to move the vector through the system.
	130	*/
38bc0361	131	msg->data = 0x100 + irq;
83821d3f MM	132
83821d3f MM	133	#ifdef CONFIG_SMP
38bc0361	134	set_irq_affinity_info(irq, sn_irq_info->irq_cpuid, 0);
83821d3f MM	135	#endif
	136
	137	return 0;
	138	}
	139
	140	static void
38bc0361	141	sn_msi_target(unsigned int irq, cpumask_t cpu_mask, struct msi_msg *msg)
83821d3f MM	142	{
	143	int slice;
	144	nasid_t nasid;
	145	u64 bus_addr;
	146	struct pci_dev *pdev;
	147	struct pcidev_info *sn_pdev;
	148	struct sn_irq_info *sn_irq_info;
	149	struct sn_irq_info *new_irq_info;
	150	struct sn_pcibus_provider *provider;
38bc0361	151	unsigned int cpu;
83821d3f	152
38bc0361 EB	153	cpu = first_cpu(cpu_mask);
38bc0361 EB	154	sn_irq_info = sn_msi_info[irq].sn_irq_info;
83821d3f MM	155	if (sn_irq_info == NULL \|\| sn_irq_info->irq_int_bit >= 0)
	156	return;
	157
	158	/*
	159	* Release XIO resources for the old MSI PCI address
	160	*/
	161
	162	sn_pdev = (struct pcidev_info *)sn_irq_info->irq_pciioinfo;
	163	pdev = sn_pdev->pdi_linux_pcidev;
	164	provider = SN_PCIDEV_BUSPROVIDER(pdev);
	165
38bc0361	166	bus_addr = (u64)(msg->address_hi) << 32 \| (u64)(msg->address_lo);
83821d3f	167	(*provider->dma_unmap)(pdev, bus_addr, PCI_DMA_FROMDEVICE);
38bc0361	168	sn_msi_info[irq].pci_addr = 0;
83821d3f MM	169
	170	nasid = cpuid_to_nasid(cpu);
	171	slice = cpuid_to_slice(cpu);
	172
	173	new_irq_info = sn_retarget_vector(sn_irq_info, nasid, slice);
38bc0361	174	sn_msi_info[irq].sn_irq_info = new_irq_info;
83821d3f MM	175	if (new_irq_info == NULL)
	176	return;
	177
	178	/*
	179	* Map the xio address into bus space
	180	*/
	181
	182	bus_addr = (*provider->dma_map_consistent)(pdev,
	183	new_irq_info->irq_xtalkaddr,
	184	sizeof(new_irq_info->irq_xtalkaddr),
	185	SN_DMA_MSI\|SN_DMA_ADDR_XIO);
	186
38bc0361 EB	187	sn_msi_info[irq].pci_addr = bus_addr;
	188	msg->address_hi = (u32)(bus_addr >> 32);
	189	msg->address_lo = (u32)(bus_addr & 0x00000000ffffffff);
83821d3f MM	190	}
	191
	192	struct msi_ops sn_msi_ops = {
38bc0361	193	.needs_64bit_address = 1,
83821d3f MM	194	.setup = sn_msi_setup,
	195	.teardown = sn_msi_teardown,
	196	#ifdef CONFIG_SMP
	197	.target = sn_msi_target,
	198	#endif
	199	};
	200
	201	int
	202	sn_msi_init(void)
	203	{
	204	sn_msi_info =
38bc0361	205	kzalloc(sizeof(struct sn_msi_info) * NR_IRQS, GFP_KERNEL);
83821d3f MM	206	if (! sn_msi_info)
	207	return -ENOMEM;
	208
	209	msi_register(&sn_msi_ops);
	210	return 0;
fd58e55f	211	}