/* * 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", .owner = THIS_MODULE, .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);