linux/arch/powerpc/sysdev/ppc4xx_hsta_msi.c
Linus Torvalds ff474e8ca8 powerpc updates for 4.3
- Support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask from Benjamin Herrenschmidt
  - EEH fixes for SRIOV from Gavin
  - Introduce rtas_get_sensor_fast() for IRQ handlers from Thomas Huth
  - Use hardware RNG for arch_get_random_seed_* not arch_get_random_* from Paul Mackerras
  - Seccomp filter support from Michael Ellerman
  - opal_cec_reboot2() handling for HMIs & machine checks from Mahesh Salgaonkar
  - Add powerpc timebase as a trace clock source from Naveen N. Rao
  - Misc cleanups in the xmon, signal & SLB code from Anshuman Khandual
  - Add an inline function to update POWER8 HID0 from Gautham R. Shenoy
  - Fix pte_pagesize_index() crash on 4K w/64K hash from Michael Ellerman
  - Drop support for 64K local store on 4K kernels from Michael Ellerman
  - move dma_get_required_mask() from pnv_phb to pci_controller_ops from Andrew Donnellan
  - Initialize distance lookup table from drconf path from Nikunj A Dadhania
  - Enable RTC class support from Vaibhav Jain
  - Disable automatically blocked PCI config from Gavin Shan
  - Add LEDs driver for PowerNV platform from Vasant Hegde
  - Fix endianness issues in the HVSI driver from Laurent Dufour
  - Kexec endian fixes from Samuel Mendoza-Jonas
  - Fix corrupted pdn list from Gavin Shan
  - Fix fenced PHB caused by eeh_slot_error_detail() from Gavin Shan
 
  - Freescale updates from Scott: Highlights include 32-bit memcpy/memset
    optimizations, checksum optimizations, 85xx config fragments and updates,
    device tree updates, e6500 fixes for non-SMP, and misc cleanup and minor
    fixes.
 
  - A ton of cxl updates & fixes:
   - Add explicit precision specifiers from Rasmus Villemoes
   - use more common format specifier from Rasmus Villemoes
   - Destroy cxl_adapter_idr on module_exit from Johannes Thumshirn
   - Destroy afu->contexts_idr on release of an afu from Johannes Thumshirn
   - Compile with -Werror from Daniel Axtens
   - EEH support from Daniel Axtens
   - Plug irq_bitmap getting leaked in cxl_context from Vaibhav Jain
   - Add alternate MMIO error handling from Ian Munsie
   - Allow release of contexts which have been OPENED but not STARTED from Andrew Donnellan
   - Remove use of macro DEFINE_PCI_DEVICE_TABLE from Vaishali Thakkar
   - Release irqs if memory allocation fails from Vaibhav Jain
   - Remove racy attempt to force EEH invocation in reset from Daniel Axtens
   - Fix + cleanup error paths in cxl_dev_context_init from Ian Munsie
   - Fix force unmapping mmaps of contexts allocated through the kernel api from Ian Munsie
   - Set up and enable PSL Timebase from Philippe Bergheaud
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Merge tag 'powerpc-4.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

Pull powerpc updates from Michael Ellerman:

 - support "hybrid" iommu/direct DMA ops for coherent_mask < dma_mask
   from Benjamin Herrenschmidt

 - EEH fixes for SRIOV from Gavin

 - introduce rtas_get_sensor_fast() for IRQ handlers from Thomas Huth

 - use hardware RNG for arch_get_random_seed_* not arch_get_random_*
   from Paul Mackerras

 - seccomp filter support from Michael Ellerman

 - opal_cec_reboot2() handling for HMIs & machine checks from Mahesh
   Salgaonkar

 - add powerpc timebase as a trace clock source from Naveen N.  Rao

 - misc cleanups in the xmon, signal & SLB code from Anshuman Khandual

 - add an inline function to update POWER8 HID0 from Gautham R.  Shenoy

 - fix pte_pagesize_index() crash on 4K w/64K hash from Michael Ellerman

 - drop support for 64K local store on 4K kernels from Michael Ellerman

 - move dma_get_required_mask() from pnv_phb to pci_controller_ops from
   Andrew Donnellan

 - initialize distance lookup table from drconf path from Nikunj A
   Dadhania

 - enable RTC class support from Vaibhav Jain

 - disable automatically blocked PCI config from Gavin Shan

 - add LEDs driver for PowerNV platform from Vasant Hegde

 - fix endianness issues in the HVSI driver from Laurent Dufour

 - kexec endian fixes from Samuel Mendoza-Jonas

 - fix corrupted pdn list from Gavin Shan

 - fix fenced PHB caused by eeh_slot_error_detail() from Gavin Shan

 - Freescale updates from Scott: Highlights include 32-bit memcpy/memset
   optimizations, checksum optimizations, 85xx config fragments and
   updates, device tree updates, e6500 fixes for non-SMP, and misc
   cleanup and minor fixes.

 - a ton of cxl updates & fixes:
    - add explicit precision specifiers from Rasmus Villemoes
    - use more common format specifier from Rasmus Villemoes
    - destroy cxl_adapter_idr on module_exit from Johannes Thumshirn
    - destroy afu->contexts_idr on release of an afu from Johannes
      Thumshirn
    - compile with -Werror from Daniel Axtens
    - EEH support from Daniel Axtens
    - plug irq_bitmap getting leaked in cxl_context from Vaibhav Jain
    - add alternate MMIO error handling from Ian Munsie
    - allow release of contexts which have been OPENED but not STARTED
      from Andrew Donnellan
    - remove use of macro DEFINE_PCI_DEVICE_TABLE from Vaishali Thakkar
    - release irqs if memory allocation fails from Vaibhav Jain
    - remove racy attempt to force EEH invocation in reset from Daniel
      Axtens
    - fix + cleanup error paths in cxl_dev_context_init from Ian Munsie
    - fix force unmapping mmaps of contexts allocated through the kernel
      api from Ian Munsie
    - set up and enable PSL Timebase from Philippe Bergheaud

* tag 'powerpc-4.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (140 commits)
  cxl: Set up and enable PSL Timebase
  cxl: Fix force unmapping mmaps of contexts allocated through the kernel api
  cxl: Fix + cleanup error paths in cxl_dev_context_init
  powerpc/eeh: Fix fenced PHB caused by eeh_slot_error_detail()
  powerpc/pseries: Cleanup on pci_dn_reconfig_notifier()
  powerpc/pseries: Fix corrupted pdn list
  powerpc/powernv: Enable LEDS support
  powerpc/iommu: Set default DMA offset in dma_dev_setup
  cxl: Remove racy attempt to force EEH invocation in reset
  cxl: Release irqs if memory allocation fails
  cxl: Remove use of macro DEFINE_PCI_DEVICE_TABLE
  powerpc/powernv: Fix mis-merge of OPAL support for LEDS driver
  powerpc/powernv: Reset HILE before kexec_sequence()
  powerpc/kexec: Reset secondary cpu endianness before kexec
  powerpc/hvsi: Fix endianness issues in the HVSI driver
  leds/powernv: Add driver for PowerNV platform
  powerpc/powernv: Create LED platform device
  powerpc/powernv: Add OPAL interfaces for accessing and modifying system LED states
  powerpc/powernv: Fix the log message when disabling VF
  cxl: Allow release of contexts which have been OPENED but not STARTED
  ...
2015-09-03 16:41:38 -07:00

213 lines
4.9 KiB
C

/*
* 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>
#include <asm/ppc-pci.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;
/* We don't support MSI-X */
if (type == PCI_CAP_ID_MSIX) {
pr_debug("%s: MSI-X not supported.\n", __func__);
return -EINVAL;
}
for_each_pci_msi_entry(entry, dev) {
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;
}
pci_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;
for_each_pci_msi_entry(entry, dev) {
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_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct resource *mem;
int irq, ret, irq_count;
struct pci_controller *phb;
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!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 (!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 (!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;
}
}
list_for_each_entry(phb, &hose_list, list_node) {
phb->controller_ops.setup_msi_irqs = hsta_setup_msi_irqs;
phb->controller_ops.teardown_msi_irqs = hsta_teardown_msi_irqs;
}
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",
.of_match_table = hsta_msi_ids,
},
};
static int hsta_msi_init(void)
{
return platform_driver_register(&hsta_msi_driver);
}
subsys_initcall(hsta_msi_init);