Commit e2c37d90 authored by Alistair Popple's avatar Alistair Popple Committed by Benjamin Herrenschmidt
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powerpc: Added PCI MSI support using the HSTA module



The PPC476GTR SoC supports message signalled interrupts (MSI) by writing
to special addresses within the High Speed Transfer Assist (HSTA) module.

This patch adds support for PCI MSI with a new system device. The DMA
window is also updated to allow access to the entire 42-bit address range
to allow PCI devices write access to the HSTA module.
Signed-off-by: default avatarAlistair Popple <alistair@popple.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 2a2c74b2
ppc476gtr High Speed Serial Assist (HSTA) node
==============================================
The 476gtr SoC contains a high speed serial assist module attached
between the plb4 and plb6 system buses to provide high speed data
transfer between memory and system peripherals as well as support for
PCI message signalled interrupts.
Currently only the MSI support is used by Linux using the following
device tree entries:
Require properties:
- compatible : "ibm,476gtr-hsta-msi", "ibm,hsta-msi"
- reg : register mapping for the HSTA MSI space
- interrupt-parent : parent controller for mapping interrupts
- interrupts : ordered interrupt mapping for each MSI in the register
space. The first interrupt should be associated with a
register offset of 0x00, the second to 0x10, etc.
......@@ -82,6 +82,28 @@
ranges;
clock-frequency = <200000000>; // 200Mhz
HSTA0: hsta@310000e0000 {
compatible = "ibm,476gtr-hsta-msi", "ibm,hsta-msi";
reg = <0x310 0x000e0000 0x0 0xf0>;
interrupt-parent = <&MPIC>;
interrupts = <108 0
109 0
110 0
111 0
112 0
113 0
114 0
115 0
116 0
117 0
118 0
119 0
120 0
121 0
122 0
123 0>;
};
MAL0: mcmal {
compatible = "ibm,mcmal-476gtr", "ibm,mcmal2";
dcr-reg = <0xc0000000 0x062>;
......@@ -242,8 +264,10 @@
ranges = <0x02000000 0x00000000 0x80000000 0x00000110 0x80000000 0x0 0x80000000
0x01000000 0x0 0x0 0x00000140 0x0 0x0 0x00010000>;
/* Inbound starting at 0 to memsize filled in by zImage */
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x0 0x0>;
/* Inbound starting at 0x0 to 0x40000000000. In order to use MSI
* PCI devices must be able to write to the HSTA module.
*/
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x400 0x0>;
/* This drives busses 0 to 0xf */
bus-range = <0x0 0xf>;
......@@ -280,8 +304,10 @@
ranges = <0x02000000 0x00000000 0x80000000 0x00000210 0x80000000 0x0 0x80000000
0x01000000 0x0 0x0 0x00000240 0x0 0x0 0x00010000>;
/* Inbound starting at 0 to memsize filled in by zImage */
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x0 0x0>;
/* Inbound starting at 0x0 to 0x40000000000. In order to use MSI
* PCI devices must be able to write to the HSTA module.
*/
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x400 0x0>;
/* This drives busses 0 to 0xf */
bus-range = <0x0 0xf>;
......@@ -318,8 +344,10 @@
ranges = <0x02000000 0x00000000 0x80000000 0x00000190 0x80000000 0x0 0x80000000
0x01000000 0x0 0x0 0x000001c0 0x0 0x0 0x00010000>;
/* Inbound starting at 0 to memsize filled in by zImage */
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x0 0x0>;
/* Inbound starting at 0x0 to 0x40000000000. In order to use MSI
* PCI devices must be able to write to the HSTA module.
*/
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x400 0x0>;
/* This drives busses 0 to 0xf */
bus-range = <0x0 0xf>;
......@@ -356,8 +384,10 @@
ranges = <0x02000000 0x00000000 0x80000000 0x00000290 0x80000000 0x0 0x80000000
0x01000000 0x0 0x0 0x000002c0 0x0 0x0 0x00010000>;
/* Inbound starting at 0 to memsize filled in by zImage */
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x0 0x0>;
/* Inbound starting at 0x0 to 0x40000000000. In order to use MSI
* PCI devices must be able to write to the HSTA module.
*/
dma-ranges = <0x42000000 0x0 0x0 0x0 0x0 0x400 0x0>;
/* This drives busses 0 to 0xf */
bus-range = <0x0 0xf>;
......
......@@ -75,24 +75,9 @@ static void ibm_akebono_fixups(void)
{
void *emac;
u32 reg;
void *devp = finddevice("/");
u32 dma_ranges[7];
dt_fixup_memory(0x0ULL, ibm_akebono_memsize);
while ((devp = find_node_by_devtype(devp, "pci"))) {
if (getprop(devp, "dma-ranges", dma_ranges,
sizeof(dma_ranges)) < 0) {
printf("%s: Failed to get dma-ranges\r\n", __func__);
continue;
}
dma_ranges[5] = ibm_akebono_memsize >> 32;
dma_ranges[6] = ibm_akebono_memsize & 0xffffffffUL;
setprop(devp, "dma-ranges", dma_ranges, sizeof(dma_ranges));
}
/* Fixup the SD timeout frequency */
mtdcrx(CCTL0_MCO4, 0x1);
......
......@@ -206,6 +206,8 @@ config AKEBONO
select SWIOTLB
select 476FPE
select PPC4xx_PCI_EXPRESS
select PCI_MSI
select PPC4xx_HSTA_MSI
select I2C
select I2C_IBM_IIC
select NETDEVICES
......
......@@ -7,6 +7,12 @@ config PPC4xx_PCI_EXPRESS
depends on PCI && 4xx
default n
config PPC4xx_HSTA_MSI
bool
depends on PCI_MSI
depends on PCI && 4xx
default n
config PPC4xx_MSI
bool
depends on PCI_MSI
......
......@@ -45,6 +45,7 @@ obj-$(CONFIG_OF_RTC) += of_rtc.o
ifeq ($(CONFIG_PCI),y)
obj-$(CONFIG_4xx) += ppc4xx_pci.o
endif
obj-$(CONFIG_PPC4xx_HSTA_MSI) += ppc4xx_hsta_msi.o
obj-$(CONFIG_PPC4xx_MSI) += ppc4xx_msi.o
obj-$(CONFIG_PPC4xx_CPM) += ppc4xx_cpm.o
obj-$(CONFIG_PPC4xx_GPIO) += ppc4xx_gpio.o
......
/*
* MSI support for PPC4xx SoCs using High Speed Transfer Assist (HSTA) for
* generation of the interrupt.
*
* Copyright © 2013 Alistair Popple <alistair@popple.id.au> IBM Corporation
*
* 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/interrupt.h>
#include <linux/msi.h>
#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/pci.h>
#include <linux/semaphore.h>
#include <asm/msi_bitmap.h>
struct ppc4xx_hsta_msi {
struct device *dev;
/* The ioremapped HSTA MSI IO space */
u32 __iomem *data;
/* Physical address of HSTA MSI IO space */
u64 address;
struct msi_bitmap bmp;
/* An array mapping offsets to hardware IRQs */
int *irq_map;
/* Number of hwirqs supported */
int irq_count;
};
static struct ppc4xx_hsta_msi ppc4xx_hsta_msi;
static int hsta_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
struct msi_msg msg;
struct msi_desc *entry;
int irq, hwirq;
u64 addr;
list_for_each_entry(entry, &dev->msi_list, list) {
irq = msi_bitmap_alloc_hwirqs(&ppc4xx_hsta_msi.bmp, 1);
if (irq < 0) {
pr_debug("%s: Failed to allocate msi interrupt\n",
__func__);
return irq;
}
hwirq = ppc4xx_hsta_msi.irq_map[irq];
if (hwirq == NO_IRQ) {
pr_err("%s: Failed mapping irq %d\n", __func__, irq);
return -EINVAL;
}
/*
* HSTA generates interrupts on writes to 128-bit aligned
* addresses.
*/
addr = ppc4xx_hsta_msi.address + irq*0x10;
msg.address_hi = upper_32_bits(addr);
msg.address_lo = lower_32_bits(addr);
/* Data is not used by the HSTA. */
msg.data = 0;
pr_debug("%s: Setup irq %d (0x%0llx)\n", __func__, hwirq,
(((u64) msg.address_hi) << 32) | msg.address_lo);
if (irq_set_msi_desc(hwirq, entry)) {
pr_err(
"%s: Invalid hwirq %d specified in device tree\n",
__func__, hwirq);
msi_bitmap_free_hwirqs(&ppc4xx_hsta_msi.bmp, irq, 1);
return -EINVAL;
}
write_msi_msg(hwirq, &msg);
}
return 0;
}
static int hsta_find_hwirq_offset(int hwirq)
{
int irq;
/* Find the offset given the hwirq */
for (irq = 0; irq < ppc4xx_hsta_msi.irq_count; irq++)
if (ppc4xx_hsta_msi.irq_map[irq] == hwirq)
return irq;
return -EINVAL;
}
static void hsta_teardown_msi_irqs(struct pci_dev *dev)
{
struct msi_desc *entry;
int irq;
list_for_each_entry(entry, &dev->msi_list, list) {
if (entry->irq == NO_IRQ)
continue;
irq = hsta_find_hwirq_offset(entry->irq);
/* entry->irq should always be in irq_map */
BUG_ON(irq < 0);
irq_set_msi_desc(entry->irq, NULL);
msi_bitmap_free_hwirqs(&ppc4xx_hsta_msi.bmp, irq, 1);
pr_debug("%s: Teardown IRQ %u (index %u)\n", __func__,
entry->irq, irq);
}
}
static int hsta_msi_check_device(struct pci_dev *pdev, int nvec, int type)
{
/* We don't support MSI-X */
if (type == PCI_CAP_ID_MSIX) {
pr_debug("%s: MSI-X not supported.\n", __func__);
return -EINVAL;
}
return 0;
}
static int hsta_msi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *mem;
int irq, ret, irq_count;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (IS_ERR(mem)) {
dev_err(dev, "Unable to get mmio space\n");
return -EINVAL;
}
irq_count = of_irq_count(dev->of_node);
if (!irq_count) {
dev_err(dev, "Unable to find IRQ range\n");
return -EINVAL;
}
ppc4xx_hsta_msi.dev = dev;
ppc4xx_hsta_msi.address = mem->start;
ppc4xx_hsta_msi.data = ioremap(mem->start, resource_size(mem));
ppc4xx_hsta_msi.irq_count = irq_count;
if (IS_ERR(ppc4xx_hsta_msi.data)) {
dev_err(dev, "Unable to map memory\n");
return -ENOMEM;
}
ret = msi_bitmap_alloc(&ppc4xx_hsta_msi.bmp, irq_count, dev->of_node);
if (ret)
goto out;
ppc4xx_hsta_msi.irq_map = kmalloc(sizeof(int) * irq_count, GFP_KERNEL);
if (IS_ERR(ppc4xx_hsta_msi.irq_map)) {
ret = -ENOMEM;
goto out1;
}
/* Setup a mapping from irq offsets to hardware irq numbers */
for (irq = 0; irq < irq_count; irq++) {
ppc4xx_hsta_msi.irq_map[irq] =
irq_of_parse_and_map(dev->of_node, irq);
if (ppc4xx_hsta_msi.irq_map[irq] == NO_IRQ) {
dev_err(dev, "Unable to map IRQ\n");
ret = -EINVAL;
goto out2;
}
}
ppc_md.setup_msi_irqs = hsta_setup_msi_irqs;
ppc_md.teardown_msi_irqs = hsta_teardown_msi_irqs;
ppc_md.msi_check_device = hsta_msi_check_device;
return 0;
out2:
kfree(ppc4xx_hsta_msi.irq_map);
out1:
msi_bitmap_free(&ppc4xx_hsta_msi.bmp);
out:
iounmap(ppc4xx_hsta_msi.data);
return ret;
}
static const struct of_device_id hsta_msi_ids[] = {
{
.compatible = "ibm,hsta-msi",
},
{}
};
static struct platform_driver hsta_msi_driver = {
.probe = hsta_msi_probe,
.driver = {
.name = "hsta-msi",
.owner = THIS_MODULE,
.of_match_table = hsta_msi_ids,
},
};
static int hsta_msi_init(void)
{
return platform_driver_register(&hsta_msi_driver);
}
subsys_initcall(hsta_msi_init);
......@@ -176,8 +176,12 @@ static int __init ppc4xx_parse_dma_ranges(struct pci_controller *hose,
return -ENXIO;
}
/* Check that we are fully contained within 32 bits space */
if (res->end > 0xffffffff) {
/* Check that we are fully contained within 32 bits space if we are not
* running on a 460sx or 476fpe which have 64 bit bus addresses.
*/
if (res->end > 0xffffffff &&
!(of_device_is_compatible(hose->dn, "ibm,plb-pciex-460sx")
|| of_device_is_compatible(hose->dn, "ibm,plb-pciex-476fpe"))) {
printk(KERN_ERR "%s: dma-ranges outside of 32 bits space\n",
hose->dn->full_name);
return -ENXIO;
......
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