264 lines
5.8 KiB
C
264 lines
5.8 KiB
C
/*
|
|
* Copyright 2006 Jake Moilanen <moilanen@austin.ibm.com>, IBM Corp.
|
|
* Copyright 2006-2007 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; version 2 of the
|
|
* License.
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/msi.h>
|
|
|
|
#include <asm/rtas.h>
|
|
#include <asm/hw_irq.h>
|
|
#include <asm/ppc-pci.h>
|
|
|
|
static int query_token, change_token;
|
|
|
|
#define RTAS_QUERY_FN 0
|
|
#define RTAS_CHANGE_FN 1
|
|
#define RTAS_RESET_FN 2
|
|
#define RTAS_CHANGE_MSI_FN 3
|
|
#define RTAS_CHANGE_MSIX_FN 4
|
|
|
|
static struct pci_dn *get_pdn(struct pci_dev *pdev)
|
|
{
|
|
struct device_node *dn;
|
|
struct pci_dn *pdn;
|
|
|
|
dn = pci_device_to_OF_node(pdev);
|
|
if (!dn) {
|
|
dev_dbg(&pdev->dev, "rtas_msi: No OF device node\n");
|
|
return NULL;
|
|
}
|
|
|
|
pdn = PCI_DN(dn);
|
|
if (!pdn) {
|
|
dev_dbg(&pdev->dev, "rtas_msi: No PCI DN\n");
|
|
return NULL;
|
|
}
|
|
|
|
return pdn;
|
|
}
|
|
|
|
/* RTAS Helpers */
|
|
|
|
static int rtas_change_msi(struct pci_dn *pdn, u32 func, u32 num_irqs)
|
|
{
|
|
u32 addr, seq_num, rtas_ret[3];
|
|
unsigned long buid;
|
|
int rc;
|
|
|
|
addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);
|
|
buid = pdn->phb->buid;
|
|
|
|
seq_num = 1;
|
|
do {
|
|
if (func == RTAS_CHANGE_MSI_FN || func == RTAS_CHANGE_MSIX_FN)
|
|
rc = rtas_call(change_token, 6, 4, rtas_ret, addr,
|
|
BUID_HI(buid), BUID_LO(buid),
|
|
func, num_irqs, seq_num);
|
|
else
|
|
rc = rtas_call(change_token, 6, 3, rtas_ret, addr,
|
|
BUID_HI(buid), BUID_LO(buid),
|
|
func, num_irqs, seq_num);
|
|
|
|
seq_num = rtas_ret[1];
|
|
} while (rtas_busy_delay(rc));
|
|
|
|
/*
|
|
* If the RTAS call succeeded, check the number of irqs is actually
|
|
* what we asked for. If not, return an error.
|
|
*/
|
|
if (rc == 0 && rtas_ret[0] != num_irqs)
|
|
rc = -ENOSPC;
|
|
|
|
pr_debug("rtas_msi: ibm,change_msi(func=%d,num=%d), got %d rc = %d\n",
|
|
func, num_irqs, rtas_ret[0], rc);
|
|
|
|
return rc;
|
|
}
|
|
|
|
static void rtas_disable_msi(struct pci_dev *pdev)
|
|
{
|
|
struct pci_dn *pdn;
|
|
|
|
pdn = get_pdn(pdev);
|
|
if (!pdn)
|
|
return;
|
|
|
|
if (rtas_change_msi(pdn, RTAS_CHANGE_FN, 0))
|
|
pr_debug("rtas_msi: Setting MSIs to 0 failed!\n");
|
|
}
|
|
|
|
static int rtas_query_irq_number(struct pci_dn *pdn, int offset)
|
|
{
|
|
u32 addr, rtas_ret[2];
|
|
unsigned long buid;
|
|
int rc;
|
|
|
|
addr = rtas_config_addr(pdn->busno, pdn->devfn, 0);
|
|
buid = pdn->phb->buid;
|
|
|
|
do {
|
|
rc = rtas_call(query_token, 4, 3, rtas_ret, addr,
|
|
BUID_HI(buid), BUID_LO(buid), offset);
|
|
} while (rtas_busy_delay(rc));
|
|
|
|
if (rc) {
|
|
pr_debug("rtas_msi: error (%d) querying source number\n", rc);
|
|
return rc;
|
|
}
|
|
|
|
return rtas_ret[0];
|
|
}
|
|
|
|
static void rtas_teardown_msi_irqs(struct pci_dev *pdev)
|
|
{
|
|
struct msi_desc *entry;
|
|
|
|
list_for_each_entry(entry, &pdev->msi_list, list) {
|
|
if (entry->irq == NO_IRQ)
|
|
continue;
|
|
|
|
set_irq_msi(entry->irq, NULL);
|
|
irq_dispose_mapping(entry->irq);
|
|
}
|
|
|
|
rtas_disable_msi(pdev);
|
|
}
|
|
|
|
static int check_req_msi(struct pci_dev *pdev, int nvec)
|
|
{
|
|
struct device_node *dn;
|
|
struct pci_dn *pdn;
|
|
const u32 *req_msi;
|
|
|
|
pdn = get_pdn(pdev);
|
|
if (!pdn)
|
|
return -ENODEV;
|
|
|
|
dn = pdn->node;
|
|
|
|
req_msi = of_get_property(dn, "ibm,req#msi", NULL);
|
|
if (!req_msi) {
|
|
pr_debug("rtas_msi: No ibm,req#msi on %s\n", dn->full_name);
|
|
return -ENOENT;
|
|
}
|
|
|
|
if (*req_msi < nvec) {
|
|
pr_debug("rtas_msi: ibm,req#msi requests < %d MSIs\n", nvec);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rtas_msi_check_device(struct pci_dev *pdev, int nvec, int type)
|
|
{
|
|
if (type == PCI_CAP_ID_MSIX)
|
|
pr_debug("rtas_msi: MSI-X untested, trying anyway.\n");
|
|
|
|
return check_req_msi(pdev, nvec);
|
|
}
|
|
|
|
static int rtas_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
|
|
{
|
|
struct pci_dn *pdn;
|
|
int hwirq, virq, i, rc;
|
|
struct msi_desc *entry;
|
|
|
|
pdn = get_pdn(pdev);
|
|
if (!pdn)
|
|
return -ENODEV;
|
|
|
|
/*
|
|
* Try the new more explicit firmware interface, if that fails fall
|
|
* back to the old interface. The old interface is known to never
|
|
* return MSI-Xs.
|
|
*/
|
|
if (type == PCI_CAP_ID_MSI) {
|
|
rc = rtas_change_msi(pdn, RTAS_CHANGE_MSI_FN, nvec);
|
|
|
|
if (rc) {
|
|
pr_debug("rtas_msi: trying the old firmware call.\n");
|
|
rc = rtas_change_msi(pdn, RTAS_CHANGE_FN, nvec);
|
|
}
|
|
} else
|
|
rc = rtas_change_msi(pdn, RTAS_CHANGE_MSIX_FN, nvec);
|
|
|
|
if (rc) {
|
|
pr_debug("rtas_msi: rtas_change_msi() failed\n");
|
|
return rc;
|
|
}
|
|
|
|
i = 0;
|
|
list_for_each_entry(entry, &pdev->msi_list, list) {
|
|
hwirq = rtas_query_irq_number(pdn, i);
|
|
if (hwirq < 0) {
|
|
pr_debug("rtas_msi: error (%d) getting hwirq\n", rc);
|
|
return hwirq;
|
|
}
|
|
|
|
virq = irq_create_mapping(NULL, hwirq);
|
|
|
|
if (virq == NO_IRQ) {
|
|
pr_debug("rtas_msi: Failed mapping hwirq %d\n", hwirq);
|
|
return -ENOSPC;
|
|
}
|
|
|
|
dev_dbg(&pdev->dev, "rtas_msi: allocated virq %d\n", virq);
|
|
set_irq_msi(virq, entry);
|
|
unmask_msi_irq(virq);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rtas_msi_pci_irq_fixup(struct pci_dev *pdev)
|
|
{
|
|
/* No LSI -> leave MSIs (if any) configured */
|
|
if (pdev->irq == NO_IRQ) {
|
|
dev_dbg(&pdev->dev, "rtas_msi: no LSI, nothing to do.\n");
|
|
return;
|
|
}
|
|
|
|
/* No MSI -> MSIs can't have been assigned by fw, leave LSI */
|
|
if (check_req_msi(pdev, 1)) {
|
|
dev_dbg(&pdev->dev, "rtas_msi: no req#msi, nothing to do.\n");
|
|
return;
|
|
}
|
|
|
|
dev_dbg(&pdev->dev, "rtas_msi: disabling existing MSI.\n");
|
|
rtas_disable_msi(pdev);
|
|
}
|
|
|
|
static int rtas_msi_init(void)
|
|
{
|
|
query_token = rtas_token("ibm,query-interrupt-source-number");
|
|
change_token = rtas_token("ibm,change-msi");
|
|
|
|
if ((query_token == RTAS_UNKNOWN_SERVICE) ||
|
|
(change_token == RTAS_UNKNOWN_SERVICE)) {
|
|
pr_debug("rtas_msi: no RTAS tokens, no MSI support.\n");
|
|
return -1;
|
|
}
|
|
|
|
pr_debug("rtas_msi: Registering RTAS MSI callbacks.\n");
|
|
|
|
WARN_ON(ppc_md.setup_msi_irqs);
|
|
ppc_md.setup_msi_irqs = rtas_setup_msi_irqs;
|
|
ppc_md.teardown_msi_irqs = rtas_teardown_msi_irqs;
|
|
ppc_md.msi_check_device = rtas_msi_check_device;
|
|
|
|
WARN_ON(ppc_md.pci_irq_fixup);
|
|
ppc_md.pci_irq_fixup = rtas_msi_pci_irq_fixup;
|
|
|
|
return 0;
|
|
}
|
|
arch_initcall(rtas_msi_init);
|