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![Linus Torvalds](/assets/img/avatar_default.png)
- 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 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJV5+GzAAoJEFHr6jzI4aWA0iAP/jcd0kNaNBzLgcDKKygKdgz4 xn4EWu81vfMfZYWesb0ATrjlH0hLsRxSXoFUqUMhtJTa5kNAoCIaz/M8WBALS50h aT+i7br4WEU2j2FcaMyP3iAZx/2hl+2utODJSHPRWPkec1fUDBfEyBf++e520RWM HUQGIGZXh8yq7KMA96Pwhsvls9vOB8hS2UdU/NS8ff3J5jFvXC1/WmF2qfzJBS1V 8iHyz26Jl8+dJ+et7iC2oD5XQAjIH1oJgOyPVPBzAQttfi8RjuVzRA30TfPBAUwI lC9nlmPy6bCe4kiQYWVB1z7GegHyW/9vkeuMj/u8mZbqpaayMEMZmd2C3iNDXNHx i2NSvdln539t4qWYsV2v6lVCfa/ayDHD73Wackj5Dk394tzXnpCPhxNzc2yKEd5v h7vwYc9jBhsbfSCSogaM+gSHJ1APgCidggHJMYYNA2nN2u6V62RpsMB7zp/1+Q2v yqYdD8oYF4Dm21x/ujaNFrlizROD46WS0UqdJ3yP6HAqRYIpRXtibmpECJgt1n5h HjADEci4hQ2UQxdMdp/Q5KZnPTJebBtrZrmkW5r6cZBUaTB5TVkFaEWN44CT/Loh tMNeA3qOBN06CaQS2WL3UUUWpbZq9fSbWuUZ5lWZDb5AOyRxe5eWVYNLkiyIXozY L24l1bYdBhXahnjoS/kc =n9+X -----END PGP SIGNATURE----- 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 ...
213 lines
4.9 KiB
C
213 lines
4.9 KiB
C
/*
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* MSI support for PPC4xx SoCs using High Speed Transfer Assist (HSTA) for
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* generation of the interrupt.
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*
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* Copyright © 2013 Alistair Popple <alistair@popple.id.au> IBM Corporation
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/msi.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/pci.h>
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#include <linux/semaphore.h>
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#include <asm/msi_bitmap.h>
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#include <asm/ppc-pci.h>
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struct ppc4xx_hsta_msi {
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struct device *dev;
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/* The ioremapped HSTA MSI IO space */
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u32 __iomem *data;
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/* Physical address of HSTA MSI IO space */
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u64 address;
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struct msi_bitmap bmp;
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/* An array mapping offsets to hardware IRQs */
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int *irq_map;
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/* Number of hwirqs supported */
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int irq_count;
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};
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static struct ppc4xx_hsta_msi ppc4xx_hsta_msi;
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static int hsta_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
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{
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struct msi_msg msg;
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struct msi_desc *entry;
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int irq, hwirq;
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u64 addr;
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/* We don't support MSI-X */
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if (type == PCI_CAP_ID_MSIX) {
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pr_debug("%s: MSI-X not supported.\n", __func__);
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return -EINVAL;
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}
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for_each_pci_msi_entry(entry, dev) {
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irq = msi_bitmap_alloc_hwirqs(&ppc4xx_hsta_msi.bmp, 1);
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if (irq < 0) {
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pr_debug("%s: Failed to allocate msi interrupt\n",
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__func__);
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return irq;
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}
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hwirq = ppc4xx_hsta_msi.irq_map[irq];
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if (hwirq == NO_IRQ) {
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pr_err("%s: Failed mapping irq %d\n", __func__, irq);
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return -EINVAL;
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}
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/*
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* HSTA generates interrupts on writes to 128-bit aligned
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* addresses.
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*/
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addr = ppc4xx_hsta_msi.address + irq*0x10;
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msg.address_hi = upper_32_bits(addr);
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msg.address_lo = lower_32_bits(addr);
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/* Data is not used by the HSTA. */
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msg.data = 0;
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pr_debug("%s: Setup irq %d (0x%0llx)\n", __func__, hwirq,
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(((u64) msg.address_hi) << 32) | msg.address_lo);
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if (irq_set_msi_desc(hwirq, entry)) {
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pr_err(
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"%s: Invalid hwirq %d specified in device tree\n",
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__func__, hwirq);
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msi_bitmap_free_hwirqs(&ppc4xx_hsta_msi.bmp, irq, 1);
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return -EINVAL;
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}
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pci_write_msi_msg(hwirq, &msg);
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}
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return 0;
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}
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static int hsta_find_hwirq_offset(int hwirq)
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{
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int irq;
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/* Find the offset given the hwirq */
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for (irq = 0; irq < ppc4xx_hsta_msi.irq_count; irq++)
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if (ppc4xx_hsta_msi.irq_map[irq] == hwirq)
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return irq;
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return -EINVAL;
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}
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static void hsta_teardown_msi_irqs(struct pci_dev *dev)
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{
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struct msi_desc *entry;
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int irq;
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for_each_pci_msi_entry(entry, dev) {
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if (entry->irq == NO_IRQ)
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continue;
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irq = hsta_find_hwirq_offset(entry->irq);
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/* entry->irq should always be in irq_map */
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BUG_ON(irq < 0);
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irq_set_msi_desc(entry->irq, NULL);
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msi_bitmap_free_hwirqs(&ppc4xx_hsta_msi.bmp, irq, 1);
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pr_debug("%s: Teardown IRQ %u (index %u)\n", __func__,
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entry->irq, irq);
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}
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}
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static int hsta_msi_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct resource *mem;
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int irq, ret, irq_count;
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struct pci_controller *phb;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!mem) {
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dev_err(dev, "Unable to get mmio space\n");
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return -EINVAL;
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}
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irq_count = of_irq_count(dev->of_node);
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if (!irq_count) {
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dev_err(dev, "Unable to find IRQ range\n");
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return -EINVAL;
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}
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ppc4xx_hsta_msi.dev = dev;
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ppc4xx_hsta_msi.address = mem->start;
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ppc4xx_hsta_msi.data = ioremap(mem->start, resource_size(mem));
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ppc4xx_hsta_msi.irq_count = irq_count;
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if (!ppc4xx_hsta_msi.data) {
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dev_err(dev, "Unable to map memory\n");
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return -ENOMEM;
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}
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ret = msi_bitmap_alloc(&ppc4xx_hsta_msi.bmp, irq_count, dev->of_node);
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if (ret)
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goto out;
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ppc4xx_hsta_msi.irq_map = kmalloc(sizeof(int) * irq_count, GFP_KERNEL);
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if (!ppc4xx_hsta_msi.irq_map) {
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ret = -ENOMEM;
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goto out1;
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}
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/* Setup a mapping from irq offsets to hardware irq numbers */
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for (irq = 0; irq < irq_count; irq++) {
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ppc4xx_hsta_msi.irq_map[irq] =
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irq_of_parse_and_map(dev->of_node, irq);
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if (ppc4xx_hsta_msi.irq_map[irq] == NO_IRQ) {
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dev_err(dev, "Unable to map IRQ\n");
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ret = -EINVAL;
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goto out2;
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}
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}
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list_for_each_entry(phb, &hose_list, list_node) {
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phb->controller_ops.setup_msi_irqs = hsta_setup_msi_irqs;
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phb->controller_ops.teardown_msi_irqs = hsta_teardown_msi_irqs;
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}
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return 0;
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out2:
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kfree(ppc4xx_hsta_msi.irq_map);
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out1:
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msi_bitmap_free(&ppc4xx_hsta_msi.bmp);
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out:
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iounmap(ppc4xx_hsta_msi.data);
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return ret;
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}
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static const struct of_device_id hsta_msi_ids[] = {
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{
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.compatible = "ibm,hsta-msi",
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},
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{}
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};
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static struct platform_driver hsta_msi_driver = {
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.probe = hsta_msi_probe,
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.driver = {
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.name = "hsta-msi",
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.of_match_table = hsta_msi_ids,
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},
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};
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static int hsta_msi_init(void)
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{
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return platform_driver_register(&hsta_msi_driver);
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}
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subsys_initcall(hsta_msi_init);
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