278 lines
6.9 KiB
C
278 lines
6.9 KiB
C
/*
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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 <tmarri@apm.com>
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* Feng Kan <fkan@apm.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <linux/irq.h>
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#include <linux/bootmem.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 <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 <boot/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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#define NR_MSI_IRQS 4
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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[NR_MSI_IRQS];
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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, NR_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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list_for_each_entry(entry, &dev->msi_list, list) {
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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 == NO_IRQ) {
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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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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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dev_dbg(&dev->dev, "PCIE-MSI: tearing down msi irqs\n");
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list_for_each_entry(entry, &dev->msi_list, list) {
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if (entry->irq == NO_IRQ)
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continue;
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irq_set_msi_desc(entry->irq, NULL);
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msi_bitmap_free_hwirqs(&msi_data->bitmap,
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virq_to_hw(entry->irq), 1);
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irq_dispose_mapping(entry->irq);
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}
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}
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static int ppc4xx_msi_check_device(struct pci_dev *pdev, int nvec, int type)
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{
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dev_dbg(&pdev->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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return 0;
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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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sdr_addr = of_get_property(dev->dev.of_node, "sdr-base", NULL);
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if (!sdr_addr)
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return -1;
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SDR0_WRITE(sdr_addr, (u64)res.start >> 32); /*HIGH addr */
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SDR0_WRITE(sdr_addr + 1, res.start & 0xFFFFFFFF); /* Low addr */
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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 problem failed\n");
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return -ENOMEM;
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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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msi->msi_addr_hi = 0x0;
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msi->msi_addr_lo = (u32) msi_phys;
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dev_dbg(&dev->dev, "PCIE-MSI: msi address 0x%x\n", msi->msi_addr_lo);
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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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msi_data = of_get_property(dev->dev.of_node, "msi-data", NULL);
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if (!msi_data)
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return -1;
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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 -1;
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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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return 0;
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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 < NR_MSI_IRQS; i++) {
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virq = msi->msi_virqs[i];
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if (virq != NO_IRQ)
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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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kfree(msi);
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return 0;
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}
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static int __devinit 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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msi = &ppc4xx_msi;/*keep the msi data for further use*/
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dev_dbg(&dev->dev, "PCIE-MSI: Setting up MSI support...\n");
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msi = kzalloc(sizeof(struct ppc4xx_msi), GFP_KERNEL);
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if (!msi) {
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dev_err(&dev->dev, "No memory for MSI structure\n");
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return -ENOMEM;
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}
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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, "%s resource error!\n",
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dev->dev.of_node->full_name);
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goto error_out;
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}
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if (ppc4xx_setup_pcieh_hw(dev, res, msi))
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goto error_out;
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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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ppc_md.setup_msi_irqs = ppc4xx_setup_msi_irqs;
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ppc_md.teardown_msi_irqs = ppc4xx_teardown_msi_irqs;
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ppc_md.msi_check_device = ppc4xx_msi_check_device;
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return err;
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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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.owner = THIS_MODULE,
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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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