From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/arch/powerpc/sysdev/ppc4xx_msi.c | 282 ++++++++++++++++++++++++++++++++ 1 file changed, 282 insertions(+) create mode 100644 kernel/arch/powerpc/sysdev/ppc4xx_msi.c (limited to 'kernel/arch/powerpc/sysdev/ppc4xx_msi.c') diff --git a/kernel/arch/powerpc/sysdev/ppc4xx_msi.c b/kernel/arch/powerpc/sysdev/ppc4xx_msi.c new file mode 100644 index 000000000..6e2e6aa37 --- /dev/null +++ b/kernel/arch/powerpc/sysdev/ppc4xx_msi.c @@ -0,0 +1,282 @@ +/* + * Adding PCI-E MSI support for PPC4XX SoCs. + * + * Copyright (c) 2010, Applied Micro Circuits Corporation + * Authors: Tirumala R Marri + * Feng Kan + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define PEIH_TERMADH 0x00 +#define PEIH_TERMADL 0x08 +#define PEIH_MSIED 0x10 +#define PEIH_MSIMK 0x18 +#define PEIH_MSIASS 0x20 +#define PEIH_FLUSH0 0x30 +#define PEIH_FLUSH1 0x38 +#define PEIH_CNTRST 0x48 + +static int msi_irqs; + +struct ppc4xx_msi { + u32 msi_addr_lo; + u32 msi_addr_hi; + void __iomem *msi_regs; + int *msi_virqs; + struct msi_bitmap bitmap; + struct device_node *msi_dev; +}; + +static struct ppc4xx_msi ppc4xx_msi; + +static int ppc4xx_msi_init_allocator(struct platform_device *dev, + struct ppc4xx_msi *msi_data) +{ + int err; + + err = msi_bitmap_alloc(&msi_data->bitmap, msi_irqs, + dev->dev.of_node); + if (err) + return err; + + err = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap); + if (err < 0) { + msi_bitmap_free(&msi_data->bitmap); + return err; + } + + return 0; +} + +static int ppc4xx_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) +{ + int int_no = -ENOMEM; + unsigned int virq; + struct msi_msg msg; + struct msi_desc *entry; + struct ppc4xx_msi *msi_data = &ppc4xx_msi; + + dev_dbg(&dev->dev, "PCIE-MSI:%s called. vec %x type %d\n", + __func__, nvec, type); + if (type == PCI_CAP_ID_MSIX) + pr_debug("ppc4xx msi: MSI-X untested, trying anyway.\n"); + + msi_data->msi_virqs = kmalloc((msi_irqs) * sizeof(int), GFP_KERNEL); + if (!msi_data->msi_virqs) + return -ENOMEM; + + list_for_each_entry(entry, &dev->msi_list, list) { + int_no = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1); + if (int_no >= 0) + break; + if (int_no < 0) { + pr_debug("%s: fail allocating msi interrupt\n", + __func__); + } + virq = irq_of_parse_and_map(msi_data->msi_dev, int_no); + if (virq == NO_IRQ) { + dev_err(&dev->dev, "%s: fail mapping irq\n", __func__); + msi_bitmap_free_hwirqs(&msi_data->bitmap, int_no, 1); + return -ENOSPC; + } + dev_dbg(&dev->dev, "%s: virq = %d\n", __func__, virq); + + /* Setup msi address space */ + msg.address_hi = msi_data->msi_addr_hi; + msg.address_lo = msi_data->msi_addr_lo; + + irq_set_msi_desc(virq, entry); + msg.data = int_no; + pci_write_msi_msg(virq, &msg); + } + return 0; +} + +void ppc4xx_teardown_msi_irqs(struct pci_dev *dev) +{ + struct msi_desc *entry; + struct ppc4xx_msi *msi_data = &ppc4xx_msi; + + dev_dbg(&dev->dev, "PCIE-MSI: tearing down msi irqs\n"); + + list_for_each_entry(entry, &dev->msi_list, list) { + if (entry->irq == NO_IRQ) + continue; + irq_set_msi_desc(entry->irq, NULL); + msi_bitmap_free_hwirqs(&msi_data->bitmap, + virq_to_hw(entry->irq), 1); + irq_dispose_mapping(entry->irq); + } +} + +static int ppc4xx_setup_pcieh_hw(struct platform_device *dev, + struct resource res, struct ppc4xx_msi *msi) +{ + const u32 *msi_data; + const u32 *msi_mask; + const u32 *sdr_addr; + dma_addr_t msi_phys; + void *msi_virt; + + sdr_addr = of_get_property(dev->dev.of_node, "sdr-base", NULL); + if (!sdr_addr) + return -1; + + mtdcri(SDR0, *sdr_addr, upper_32_bits(res.start)); /*HIGH addr */ + mtdcri(SDR0, *sdr_addr + 1, lower_32_bits(res.start)); /* Low addr */ + + msi->msi_dev = of_find_node_by_name(NULL, "ppc4xx-msi"); + if (!msi->msi_dev) + return -ENODEV; + + msi->msi_regs = of_iomap(msi->msi_dev, 0); + if (!msi->msi_regs) { + dev_err(&dev->dev, "of_iomap problem failed\n"); + return -ENOMEM; + } + dev_dbg(&dev->dev, "PCIE-MSI: msi register mapped 0x%x 0x%x\n", + (u32) (msi->msi_regs + PEIH_TERMADH), (u32) (msi->msi_regs)); + + msi_virt = dma_alloc_coherent(&dev->dev, 64, &msi_phys, GFP_KERNEL); + if (!msi_virt) + return -ENOMEM; + msi->msi_addr_hi = upper_32_bits(msi_phys); + msi->msi_addr_lo = lower_32_bits(msi_phys & 0xffffffff); + dev_dbg(&dev->dev, "PCIE-MSI: msi address high 0x%x, low 0x%x\n", + msi->msi_addr_hi, msi->msi_addr_lo); + + /* Progam the Interrupt handler Termination addr registers */ + out_be32(msi->msi_regs + PEIH_TERMADH, msi->msi_addr_hi); + out_be32(msi->msi_regs + PEIH_TERMADL, msi->msi_addr_lo); + + msi_data = of_get_property(dev->dev.of_node, "msi-data", NULL); + if (!msi_data) + return -1; + msi_mask = of_get_property(dev->dev.of_node, "msi-mask", NULL); + if (!msi_mask) + return -1; + /* Program MSI Expected data and Mask bits */ + out_be32(msi->msi_regs + PEIH_MSIED, *msi_data); + out_be32(msi->msi_regs + PEIH_MSIMK, *msi_mask); + + dma_free_coherent(&dev->dev, 64, msi_virt, msi_phys); + + return 0; +} + +static int ppc4xx_of_msi_remove(struct platform_device *dev) +{ + struct ppc4xx_msi *msi = dev->dev.platform_data; + int i; + int virq; + + for (i = 0; i < msi_irqs; i++) { + virq = msi->msi_virqs[i]; + if (virq != NO_IRQ) + irq_dispose_mapping(virq); + } + + if (msi->bitmap.bitmap) + msi_bitmap_free(&msi->bitmap); + iounmap(msi->msi_regs); + of_node_put(msi->msi_dev); + kfree(msi); + + return 0; +} + +static int ppc4xx_msi_probe(struct platform_device *dev) +{ + struct ppc4xx_msi *msi; + struct resource res; + int err = 0; + + dev_dbg(&dev->dev, "PCIE-MSI: Setting up MSI support...\n"); + + msi = kzalloc(sizeof(struct ppc4xx_msi), GFP_KERNEL); + if (!msi) { + dev_err(&dev->dev, "No memory for MSI structure\n"); + return -ENOMEM; + } + dev->dev.platform_data = msi; + + /* Get MSI ranges */ + err = of_address_to_resource(dev->dev.of_node, 0, &res); + if (err) { + dev_err(&dev->dev, "%s resource error!\n", + dev->dev.of_node->full_name); + goto error_out; + } + + msi_irqs = of_irq_count(dev->dev.of_node); + if (!msi_irqs) + return -ENODEV; + + if (ppc4xx_setup_pcieh_hw(dev, res, msi)) + goto error_out; + + err = ppc4xx_msi_init_allocator(dev, msi); + if (err) { + dev_err(&dev->dev, "Error allocating MSI bitmap\n"); + goto error_out; + } + ppc4xx_msi = *msi; + + ppc_md.setup_msi_irqs = ppc4xx_setup_msi_irqs; + ppc_md.teardown_msi_irqs = ppc4xx_teardown_msi_irqs; + return err; + +error_out: + ppc4xx_of_msi_remove(dev); + return err; +} +static const struct of_device_id ppc4xx_msi_ids[] = { + { + .compatible = "amcc,ppc4xx-msi", + }, + {} +}; +static struct platform_driver ppc4xx_msi_driver = { + .probe = ppc4xx_msi_probe, + .remove = ppc4xx_of_msi_remove, + .driver = { + .name = "ppc4xx-msi", + .of_match_table = ppc4xx_msi_ids, + }, + +}; + +static __init int ppc4xx_msi_init(void) +{ + return platform_driver_register(&ppc4xx_msi_driver); +} + +subsys_initcall(ppc4xx_msi_init); -- cgit