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281 lines
6.6 KiB
281 lines
6.6 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Adding PCI-E MSI support for PPC4XX SoCs. |
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* |
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* Copyright (c) 2010, Applied Micro Circuits Corporation |
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* Authors: Tirumala R Marri <[email protected]> |
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* Feng Kan <[email protected]> |
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*/ |
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#include <linux/irq.h> |
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#include <linux/pci.h> |
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#include <linux/msi.h> |
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#include <linux/of_platform.h> |
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#include <linux/interrupt.h> |
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#include <linux/export.h> |
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#include <linux/kernel.h> |
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#include <asm/prom.h> |
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#include <asm/hw_irq.h> |
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#include <asm/ppc-pci.h> |
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#include <asm/dcr.h> |
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#include <asm/dcr-regs.h> |
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#include <asm/msi_bitmap.h> |
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#define PEIH_TERMADH 0x00 |
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#define PEIH_TERMADL 0x08 |
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#define PEIH_MSIED 0x10 |
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#define PEIH_MSIMK 0x18 |
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#define PEIH_MSIASS 0x20 |
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#define PEIH_FLUSH0 0x30 |
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#define PEIH_FLUSH1 0x38 |
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#define PEIH_CNTRST 0x48 |
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static int msi_irqs; |
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struct ppc4xx_msi { |
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u32 msi_addr_lo; |
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u32 msi_addr_hi; |
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void __iomem *msi_regs; |
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int *msi_virqs; |
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struct msi_bitmap bitmap; |
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struct device_node *msi_dev; |
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}; |
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static struct ppc4xx_msi ppc4xx_msi; |
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static int ppc4xx_msi_init_allocator(struct platform_device *dev, |
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struct ppc4xx_msi *msi_data) |
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{ |
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int err; |
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err = msi_bitmap_alloc(&msi_data->bitmap, msi_irqs, |
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dev->dev.of_node); |
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if (err) |
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return err; |
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err = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap); |
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if (err < 0) { |
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msi_bitmap_free(&msi_data->bitmap); |
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return err; |
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} |
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return 0; |
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} |
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static int ppc4xx_setup_msi_irqs(struct pci_dev *dev, int nvec, int type) |
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{ |
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int int_no = -ENOMEM; |
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unsigned int virq; |
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struct msi_msg msg; |
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struct msi_desc *entry; |
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struct ppc4xx_msi *msi_data = &ppc4xx_msi; |
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dev_dbg(&dev->dev, "PCIE-MSI:%s called. vec %x type %d\n", |
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__func__, nvec, type); |
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if (type == PCI_CAP_ID_MSIX) |
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pr_debug("ppc4xx msi: MSI-X untested, trying anyway.\n"); |
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msi_data->msi_virqs = kmalloc_array(msi_irqs, sizeof(int), GFP_KERNEL); |
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if (!msi_data->msi_virqs) |
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return -ENOMEM; |
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for_each_pci_msi_entry(entry, dev) { |
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int_no = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1); |
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if (int_no >= 0) |
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break; |
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if (int_no < 0) { |
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pr_debug("%s: fail allocating msi interrupt\n", |
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__func__); |
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} |
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virq = irq_of_parse_and_map(msi_data->msi_dev, int_no); |
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if (!virq) { |
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dev_err(&dev->dev, "%s: fail mapping irq\n", __func__); |
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msi_bitmap_free_hwirqs(&msi_data->bitmap, int_no, 1); |
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return -ENOSPC; |
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} |
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dev_dbg(&dev->dev, "%s: virq = %d\n", __func__, virq); |
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/* Setup msi address space */ |
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msg.address_hi = msi_data->msi_addr_hi; |
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msg.address_lo = msi_data->msi_addr_lo; |
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irq_set_msi_desc(virq, entry); |
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msg.data = int_no; |
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pci_write_msi_msg(virq, &msg); |
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} |
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return 0; |
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} |
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void ppc4xx_teardown_msi_irqs(struct pci_dev *dev) |
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{ |
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struct msi_desc *entry; |
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struct ppc4xx_msi *msi_data = &ppc4xx_msi; |
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irq_hw_number_t hwirq; |
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dev_dbg(&dev->dev, "PCIE-MSI: tearing down msi irqs\n"); |
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for_each_pci_msi_entry(entry, dev) { |
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if (!entry->irq) |
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continue; |
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hwirq = virq_to_hw(entry->irq); |
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irq_set_msi_desc(entry->irq, NULL); |
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irq_dispose_mapping(entry->irq); |
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msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1); |
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} |
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} |
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static int ppc4xx_setup_pcieh_hw(struct platform_device *dev, |
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struct resource res, struct ppc4xx_msi *msi) |
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{ |
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const u32 *msi_data; |
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const u32 *msi_mask; |
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const u32 *sdr_addr; |
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dma_addr_t msi_phys; |
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void *msi_virt; |
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int err; |
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sdr_addr = of_get_property(dev->dev.of_node, "sdr-base", NULL); |
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if (!sdr_addr) |
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return -EINVAL; |
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msi_data = of_get_property(dev->dev.of_node, "msi-data", NULL); |
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if (!msi_data) |
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return -EINVAL; |
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msi_mask = of_get_property(dev->dev.of_node, "msi-mask", NULL); |
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if (!msi_mask) |
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return -EINVAL; |
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msi->msi_dev = of_find_node_by_name(NULL, "ppc4xx-msi"); |
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if (!msi->msi_dev) |
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return -ENODEV; |
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msi->msi_regs = of_iomap(msi->msi_dev, 0); |
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if (!msi->msi_regs) { |
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dev_err(&dev->dev, "of_iomap failed\n"); |
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err = -ENOMEM; |
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goto node_put; |
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} |
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dev_dbg(&dev->dev, "PCIE-MSI: msi register mapped 0x%x 0x%x\n", |
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(u32) (msi->msi_regs + PEIH_TERMADH), (u32) (msi->msi_regs)); |
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msi_virt = dma_alloc_coherent(&dev->dev, 64, &msi_phys, GFP_KERNEL); |
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if (!msi_virt) { |
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err = -ENOMEM; |
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goto iounmap; |
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} |
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msi->msi_addr_hi = upper_32_bits(msi_phys); |
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msi->msi_addr_lo = lower_32_bits(msi_phys & 0xffffffff); |
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dev_dbg(&dev->dev, "PCIE-MSI: msi address high 0x%x, low 0x%x\n", |
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msi->msi_addr_hi, msi->msi_addr_lo); |
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mtdcri(SDR0, *sdr_addr, upper_32_bits(res.start)); /*HIGH addr */ |
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mtdcri(SDR0, *sdr_addr + 1, lower_32_bits(res.start)); /* Low addr */ |
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/* Progam the Interrupt handler Termination addr registers */ |
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out_be32(msi->msi_regs + PEIH_TERMADH, msi->msi_addr_hi); |
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out_be32(msi->msi_regs + PEIH_TERMADL, msi->msi_addr_lo); |
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/* Program MSI Expected data and Mask bits */ |
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out_be32(msi->msi_regs + PEIH_MSIED, *msi_data); |
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out_be32(msi->msi_regs + PEIH_MSIMK, *msi_mask); |
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dma_free_coherent(&dev->dev, 64, msi_virt, msi_phys); |
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return 0; |
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iounmap: |
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iounmap(msi->msi_regs); |
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node_put: |
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of_node_put(msi->msi_dev); |
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return err; |
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} |
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static int ppc4xx_of_msi_remove(struct platform_device *dev) |
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{ |
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struct ppc4xx_msi *msi = dev->dev.platform_data; |
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int i; |
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int virq; |
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for (i = 0; i < msi_irqs; i++) { |
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virq = msi->msi_virqs[i]; |
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if (virq) |
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irq_dispose_mapping(virq); |
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} |
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if (msi->bitmap.bitmap) |
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msi_bitmap_free(&msi->bitmap); |
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iounmap(msi->msi_regs); |
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of_node_put(msi->msi_dev); |
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return 0; |
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} |
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static int ppc4xx_msi_probe(struct platform_device *dev) |
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{ |
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struct ppc4xx_msi *msi; |
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struct resource res; |
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int err = 0; |
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struct pci_controller *phb; |
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dev_dbg(&dev->dev, "PCIE-MSI: Setting up MSI support...\n"); |
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msi = devm_kzalloc(&dev->dev, sizeof(*msi), GFP_KERNEL); |
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if (!msi) |
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return -ENOMEM; |
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dev->dev.platform_data = msi; |
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/* Get MSI ranges */ |
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err = of_address_to_resource(dev->dev.of_node, 0, &res); |
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if (err) { |
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dev_err(&dev->dev, "%pOF resource error!\n", dev->dev.of_node); |
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return err; |
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} |
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msi_irqs = of_irq_count(dev->dev.of_node); |
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if (!msi_irqs) |
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return -ENODEV; |
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err = ppc4xx_setup_pcieh_hw(dev, res, msi); |
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if (err) |
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return err; |
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err = ppc4xx_msi_init_allocator(dev, msi); |
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if (err) { |
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dev_err(&dev->dev, "Error allocating MSI bitmap\n"); |
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goto error_out; |
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} |
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ppc4xx_msi = *msi; |
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list_for_each_entry(phb, &hose_list, list_node) { |
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phb->controller_ops.setup_msi_irqs = ppc4xx_setup_msi_irqs; |
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phb->controller_ops.teardown_msi_irqs = ppc4xx_teardown_msi_irqs; |
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} |
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return 0; |
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error_out: |
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ppc4xx_of_msi_remove(dev); |
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return err; |
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} |
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static const struct of_device_id ppc4xx_msi_ids[] = { |
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{ |
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.compatible = "amcc,ppc4xx-msi", |
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}, |
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{} |
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}; |
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static struct platform_driver ppc4xx_msi_driver = { |
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.probe = ppc4xx_msi_probe, |
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.remove = ppc4xx_of_msi_remove, |
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.driver = { |
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.name = "ppc4xx-msi", |
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.of_match_table = ppc4xx_msi_ids, |
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}, |
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}; |
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static __init int ppc4xx_msi_init(void) |
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{ |
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return platform_driver_register(&ppc4xx_msi_driver); |
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} |
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subsys_initcall(ppc4xx_msi_init);
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