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linux-next/arch/powerpc/sysdev/fsl_msi.c
Kumar Gala 3da34aae03 powerpc/fsl: Support unique MSI addresses per PCIe Root Complex
Its feasible based on how the PCI address map is setup that the region
of PCI address space used for MSIs differs for each PHB on the same SoC.

Instead of assuming that the address mappes to CCSRBAR 1:1 we read
PEXCSRBAR (BAR0) for the PHB that the given pci_dev is on.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
2009-05-19 00:50:38 -05:00

358 lines
8.0 KiB
C

/*
* Copyright (C) 2007-2008 Freescale Semiconductor, Inc. All rights reserved.
*
* Author: Tony Li <tony.li@freescale.com>
* Jason Jin <Jason.jin@freescale.com>
*
* The hwirq alloc and free code reuse from sysdev/mpic_msi.c
*
* 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; version 2 of the
* License.
*
*/
#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/msi.h>
#include <linux/pci.h>
#include <linux/of_platform.h>
#include <sysdev/fsl_soc.h>
#include <asm/prom.h>
#include <asm/hw_irq.h>
#include <asm/ppc-pci.h>
#include "fsl_msi.h"
struct fsl_msi_feature {
u32 fsl_pic_ip;
u32 msiir_offset;
};
static struct fsl_msi *fsl_msi;
static inline u32 fsl_msi_read(u32 __iomem *base, unsigned int reg)
{
return in_be32(base + (reg >> 2));
}
/*
* We do not need this actually. The MSIR register has been read once
* in the cascade interrupt. So, this MSI interrupt has been acked
*/
static void fsl_msi_end_irq(unsigned int virq)
{
}
static struct irq_chip fsl_msi_chip = {
.mask = mask_msi_irq,
.unmask = unmask_msi_irq,
.ack = fsl_msi_end_irq,
.typename = " FSL-MSI ",
};
static int fsl_msi_host_map(struct irq_host *h, unsigned int virq,
irq_hw_number_t hw)
{
struct irq_chip *chip = &fsl_msi_chip;
get_irq_desc(virq)->status |= IRQ_TYPE_EDGE_FALLING;
set_irq_chip_and_handler(virq, chip, handle_edge_irq);
return 0;
}
static struct irq_host_ops fsl_msi_host_ops = {
.map = fsl_msi_host_map,
};
static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
{
int rc;
rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS,
msi_data->irqhost->of_node);
if (rc)
return rc;
rc = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap);
if (rc < 0) {
msi_bitmap_free(&msi_data->bitmap);
return rc;
}
return 0;
}
static int fsl_msi_check_device(struct pci_dev *pdev, int nvec, int type)
{
if (type == PCI_CAP_ID_MSIX)
pr_debug("fslmsi: MSI-X untested, trying anyway.\n");
return 0;
}
static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
{
struct msi_desc *entry;
struct fsl_msi *msi_data = fsl_msi;
list_for_each_entry(entry, &pdev->msi_list, list) {
if (entry->irq == NO_IRQ)
continue;
set_irq_msi(entry->irq, NULL);
msi_bitmap_free_hwirqs(&msi_data->bitmap,
virq_to_hw(entry->irq), 1);
irq_dispose_mapping(entry->irq);
}
return;
}
static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
struct msi_msg *msg)
{
struct fsl_msi *msi_data = fsl_msi;
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
u32 base = 0;
pci_bus_read_config_dword(hose->bus,
PCI_DEVFN(0, 0), PCI_BASE_ADDRESS_0, &base);
msg->address_lo = msi_data->msi_addr_lo + base;
msg->address_hi = msi_data->msi_addr_hi;
msg->data = hwirq;
pr_debug("%s: allocated srs: %d, ibs: %d\n",
__func__, hwirq / IRQS_PER_MSI_REG, hwirq % IRQS_PER_MSI_REG);
}
static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
int rc, hwirq;
unsigned int virq;
struct msi_desc *entry;
struct msi_msg msg;
struct fsl_msi *msi_data = fsl_msi;
list_for_each_entry(entry, &pdev->msi_list, list) {
hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
if (hwirq < 0) {
rc = hwirq;
pr_debug("%s: fail allocating msi interrupt\n",
__func__);
goto out_free;
}
virq = irq_create_mapping(msi_data->irqhost, hwirq);
if (virq == NO_IRQ) {
pr_debug("%s: fail mapping hwirq 0x%x\n",
__func__, hwirq);
msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
rc = -ENOSPC;
goto out_free;
}
set_irq_msi(virq, entry);
fsl_compose_msi_msg(pdev, hwirq, &msg);
write_msi_msg(virq, &msg);
}
return 0;
out_free:
return rc;
}
static void fsl_msi_cascade(unsigned int irq, struct irq_desc *desc)
{
unsigned int cascade_irq;
struct fsl_msi *msi_data = fsl_msi;
int msir_index = -1;
u32 msir_value = 0;
u32 intr_index;
u32 have_shift = 0;
spin_lock(&desc->lock);
if ((msi_data->feature & FSL_PIC_IP_MASK) == FSL_PIC_IP_IPIC) {
if (desc->chip->mask_ack)
desc->chip->mask_ack(irq);
else {
desc->chip->mask(irq);
desc->chip->ack(irq);
}
}
if (unlikely(desc->status & IRQ_INPROGRESS))
goto unlock;
msir_index = (int)desc->handler_data;
if (msir_index >= NR_MSI_REG)
cascade_irq = NO_IRQ;
desc->status |= IRQ_INPROGRESS;
switch (fsl_msi->feature & FSL_PIC_IP_MASK) {
case FSL_PIC_IP_MPIC:
msir_value = fsl_msi_read(msi_data->msi_regs,
msir_index * 0x10);
break;
case FSL_PIC_IP_IPIC:
msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4);
break;
}
while (msir_value) {
intr_index = ffs(msir_value) - 1;
cascade_irq = irq_linear_revmap(msi_data->irqhost,
msir_index * IRQS_PER_MSI_REG +
intr_index + have_shift);
if (cascade_irq != NO_IRQ)
generic_handle_irq(cascade_irq);
have_shift += intr_index + 1;
msir_value = msir_value >> (intr_index + 1);
}
desc->status &= ~IRQ_INPROGRESS;
switch (msi_data->feature & FSL_PIC_IP_MASK) {
case FSL_PIC_IP_MPIC:
desc->chip->eoi(irq);
break;
case FSL_PIC_IP_IPIC:
if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
desc->chip->unmask(irq);
break;
}
unlock:
spin_unlock(&desc->lock);
}
static int __devinit fsl_of_msi_probe(struct of_device *dev,
const struct of_device_id *match)
{
struct fsl_msi *msi;
struct resource res;
int err, i, count;
int rc;
int virt_msir;
const u32 *p;
struct fsl_msi_feature *features = match->data;
printk(KERN_DEBUG "Setting up Freescale MSI support\n");
msi = kzalloc(sizeof(struct fsl_msi), GFP_KERNEL);
if (!msi) {
dev_err(&dev->dev, "No memory for MSI structure\n");
err = -ENOMEM;
goto error_out;
}
msi->irqhost = irq_alloc_host(dev->node, IRQ_HOST_MAP_LINEAR,
NR_MSI_IRQS, &fsl_msi_host_ops, 0);
if (msi->irqhost == NULL) {
dev_err(&dev->dev, "No memory for MSI irqhost\n");
err = -ENOMEM;
goto error_out;
}
/* Get the MSI reg base */
err = of_address_to_resource(dev->node, 0, &res);
if (err) {
dev_err(&dev->dev, "%s resource error!\n",
dev->node->full_name);
goto error_out;
}
msi->msi_regs = ioremap(res.start, res.end - res.start + 1);
if (!msi->msi_regs) {
dev_err(&dev->dev, "ioremap problem failed\n");
goto error_out;
}
msi->feature = features->fsl_pic_ip;
msi->irqhost->host_data = msi;
msi->msi_addr_hi = 0x0;
msi->msi_addr_lo = features->msiir_offset + (res.start & 0xfffff);
rc = fsl_msi_init_allocator(msi);
if (rc) {
dev_err(&dev->dev, "Error allocating MSI bitmap\n");
goto error_out;
}
p = of_get_property(dev->node, "interrupts", &count);
if (!p) {
dev_err(&dev->dev, "no interrupts property found on %s\n",
dev->node->full_name);
err = -ENODEV;
goto error_out;
}
if (count % 8 != 0) {
dev_err(&dev->dev, "Malformed interrupts property on %s\n",
dev->node->full_name);
err = -EINVAL;
goto error_out;
}
count /= sizeof(u32);
for (i = 0; i < count / 2; i++) {
if (i > NR_MSI_REG)
break;
virt_msir = irq_of_parse_and_map(dev->node, i);
if (virt_msir != NO_IRQ) {
set_irq_data(virt_msir, (void *)i);
set_irq_chained_handler(virt_msir, fsl_msi_cascade);
}
}
fsl_msi = msi;
WARN_ON(ppc_md.setup_msi_irqs);
ppc_md.setup_msi_irqs = fsl_setup_msi_irqs;
ppc_md.teardown_msi_irqs = fsl_teardown_msi_irqs;
ppc_md.msi_check_device = fsl_msi_check_device;
return 0;
error_out:
kfree(msi);
return err;
}
static const struct fsl_msi_feature mpic_msi_feature = {
.fsl_pic_ip = FSL_PIC_IP_MPIC,
.msiir_offset = 0x140,
};
static const struct fsl_msi_feature ipic_msi_feature = {
.fsl_pic_ip = FSL_PIC_IP_IPIC,
.msiir_offset = 0x38,
};
static const struct of_device_id fsl_of_msi_ids[] = {
{
.compatible = "fsl,mpic-msi",
.data = (void *)&mpic_msi_feature,
},
{
.compatible = "fsl,ipic-msi",
.data = (void *)&ipic_msi_feature,
},
{}
};
static struct of_platform_driver fsl_of_msi_driver = {
.name = "fsl-msi",
.match_table = fsl_of_msi_ids,
.probe = fsl_of_msi_probe,
};
static __init int fsl_of_msi_init(void)
{
return of_register_platform_driver(&fsl_of_msi_driver);
}
subsys_initcall(fsl_of_msi_init);