powerpc/wsp: Add MSI support for PCI on PowerEN

Based on a patch by Michael Ellerman <michael@ellerman.id.au>

Patch was simply forward ported upstream.

Jimi Xenidis <jimix@pobox.com>

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Ellerman 2011-08-08 12:30:55 +00:00 committed by Benjamin Herrenschmidt
parent f352c72512
commit f9a71e0fd1
5 changed files with 175 additions and 0 deletions

View file

@ -5,3 +5,4 @@ obj-$(CONFIG_PPC_PSR2) += psr2.o opb_pic.o
obj-$(CONFIG_PPC_WSP) += scom_wsp.o
obj-$(CONFIG_SMP) += smp.o scom_smp.o
obj-$(CONFIG_PCI) += wsp_pci.o
obj-$(CONFIG_PCI_MSI) += msi.o

View file

@ -710,3 +710,51 @@ void __init wsp_init_irq(void)
/* We need to patch our irq chip's EOI to point to the right ICP */
wsp_irq_chip.irq_eoi = icp_ops->eoi;
}
#ifdef CONFIG_PCI_MSI
static void wsp_ics_msi_unmask_irq(struct irq_data *d)
{
wsp_chip_unmask_irq(d);
unmask_msi_irq(d);
}
static unsigned int wsp_ics_msi_startup(struct irq_data *d)
{
wsp_ics_msi_unmask_irq(d);
return 0;
}
static void wsp_ics_msi_mask_irq(struct irq_data *d)
{
mask_msi_irq(d);
wsp_chip_mask_irq(d);
}
/*
* we do it this way because we reassinge default EOI handling in
* irq_init() above
*/
static void wsp_ics_eoi(struct irq_data *data)
{
wsp_irq_chip.irq_eoi(data);
}
static struct irq_chip wsp_ics_msi = {
.name = "WSP ICS MSI",
.irq_startup = wsp_ics_msi_startup,
.irq_mask = wsp_ics_msi_mask_irq,
.irq_unmask = wsp_ics_msi_unmask_irq,
.irq_eoi = wsp_ics_eoi,
.irq_set_affinity = wsp_chip_set_affinity
};
void wsp_ics_set_msi_chip(unsigned int irq)
{
irq_set_chip(irq, &wsp_ics_msi);
}
void wsp_ics_set_std_chip(unsigned int irq)
{
irq_set_chip(irq, &wsp_irq_chip);
}
#endif /* CONFIG_PCI_MSI */

View file

@ -17,4 +17,9 @@ extern void wsp_init_irq(void);
extern int wsp_ics_alloc_irq(struct device_node *dn, int num);
extern void wsp_ics_free_irq(struct device_node *dn, unsigned int irq);
#ifdef CONFIG_PCI_MSI
extern void wsp_ics_set_msi_chip(unsigned int irq);
extern void wsp_ics_set_std_chip(unsigned int irq);
#endif /* CONFIG_PCI_MSI */
#endif /* __ICS_H */

View file

@ -0,0 +1,102 @@
/*
* Copyright 2011 Michael Ellerman, IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/msi.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include "msi.h"
#include "ics.h"
#include "wsp_pci.h"
/* Magic addresses for 32 & 64-bit MSIs with hardcoded MVE 0 */
#define MSI_ADDR_32 0xFFFF0000ul
#define MSI_ADDR_64 0x1000000000000000ul
int wsp_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
struct pci_controller *phb;
struct msi_desc *entry;
struct msi_msg msg;
unsigned int virq;
int hwirq;
phb = pci_bus_to_host(dev->bus);
if (!phb)
return -ENOENT;
entry = list_first_entry(&dev->msi_list, struct msi_desc, list);
if (entry->msi_attrib.is_64) {
msg.address_lo = 0;
msg.address_hi = MSI_ADDR_64 >> 32;
} else {
msg.address_lo = MSI_ADDR_32;
msg.address_hi = 0;
}
list_for_each_entry(entry, &dev->msi_list, list) {
hwirq = wsp_ics_alloc_irq(phb->dn, 1);
if (hwirq < 0) {
dev_warn(&dev->dev, "wsp_msi: hwirq alloc failed!\n");
return hwirq;
}
virq = irq_create_mapping(NULL, hwirq);
if (virq == NO_IRQ) {
dev_warn(&dev->dev, "wsp_msi: virq alloc failed!\n");
return -1;
}
dev_dbg(&dev->dev, "wsp_msi: allocated irq %#x/%#x\n",
hwirq, virq);
wsp_ics_set_msi_chip(virq);
irq_set_msi_desc(virq, entry);
msg.data = hwirq & XIVE_ADDR_MASK;
write_msi_msg(virq, &msg);
}
return 0;
}
void wsp_teardown_msi_irqs(struct pci_dev *dev)
{
struct pci_controller *phb;
struct msi_desc *entry;
int hwirq;
phb = pci_bus_to_host(dev->bus);
dev_dbg(&dev->dev, "wsp_msi: tearing down msi irqs\n");
list_for_each_entry(entry, &dev->msi_list, list) {
if (entry->irq == NO_IRQ)
continue;
irq_set_msi_desc(entry->irq, NULL);
wsp_ics_set_std_chip(entry->irq);
hwirq = virq_to_hw(entry->irq);
/* In this order to avoid racing with irq_create_mapping() */
irq_dispose_mapping(entry->irq);
wsp_ics_free_irq(phb->dn, hwirq);
}
}
void wsp_setup_phb_msi(struct pci_controller *phb)
{
/* Create a single MVE at offset 0 that matches everything */
out_be64(phb->cfg_data + PCIE_REG_IODA_ADDR, PCIE_REG_IODA_AD_TBL_MVT);
out_be64(phb->cfg_data + PCIE_REG_IODA_DATA0, 1ull << 63);
ppc_md.setup_msi_irqs = wsp_setup_msi_irqs;
ppc_md.teardown_msi_irqs = wsp_teardown_msi_irqs;
}

View file

@ -0,0 +1,19 @@
/*
* Copyright 2011 Michael Ellerman, IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef __WSP_MSI_H
#define __WSP_MSI_H
#ifdef CONFIG_PCI_MSI
extern void wsp_setup_phb_msi(struct pci_controller *phb);
#else
static inline void wsp_setup_phb_msi(struct pci_controller *phb) { }
#endif
#endif /* __WSP_MSI_H */