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![Joe Perches](/assets/img/avatar_default.png)
Several fixes as well where the +1 was missing. Done via coccinelle scripts like: @@ struct resource *ptr; @@ - ptr->end - ptr->start + 1 + resource_size(ptr) and some grep and typing. Mostly uncompiled, no cross-compilers. Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
457 lines
11 KiB
C
457 lines
11 KiB
C
/*
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* Copyright (C) 2007-2011 Freescale Semiconductor, Inc.
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*
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* Author: Tony Li <tony.li@freescale.com>
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* Jason Jin <Jason.jin@freescale.com>
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*
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* The hwirq alloc and free code reuse from sysdev/mpic_msi.c
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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
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* as published by the Free Software Foundation; version 2 of the
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* License.
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*
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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/msi.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/of_platform.h>
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#include <sysdev/fsl_soc.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/mpic.h>
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#include "fsl_msi.h"
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#include "fsl_pci.h"
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LIST_HEAD(msi_head);
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struct fsl_msi_feature {
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u32 fsl_pic_ip;
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u32 msiir_offset;
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};
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struct fsl_msi_cascade_data {
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struct fsl_msi *msi_data;
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int index;
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};
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static inline u32 fsl_msi_read(u32 __iomem *base, unsigned int reg)
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{
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return in_be32(base + (reg >> 2));
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}
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/*
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* We do not need this actually. The MSIR register has been read once
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* in the cascade interrupt. So, this MSI interrupt has been acked
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*/
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static void fsl_msi_end_irq(struct irq_data *d)
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{
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}
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static struct irq_chip fsl_msi_chip = {
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.irq_mask = mask_msi_irq,
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.irq_unmask = unmask_msi_irq,
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.irq_ack = fsl_msi_end_irq,
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.name = "FSL-MSI",
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};
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static int fsl_msi_host_map(struct irq_host *h, unsigned int virq,
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irq_hw_number_t hw)
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{
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struct fsl_msi *msi_data = h->host_data;
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struct irq_chip *chip = &fsl_msi_chip;
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irq_set_status_flags(virq, IRQ_TYPE_EDGE_FALLING);
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irq_set_chip_data(virq, msi_data);
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irq_set_chip_and_handler(virq, chip, handle_edge_irq);
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return 0;
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}
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static struct irq_host_ops fsl_msi_host_ops = {
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.map = fsl_msi_host_map,
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};
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static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
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{
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int rc;
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rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS,
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msi_data->irqhost->of_node);
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if (rc)
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return rc;
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rc = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap);
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if (rc < 0) {
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msi_bitmap_free(&msi_data->bitmap);
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return rc;
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}
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return 0;
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}
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static int fsl_msi_check_device(struct pci_dev *pdev, int nvec, int type)
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{
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if (type == PCI_CAP_ID_MSIX)
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pr_debug("fslmsi: MSI-X untested, trying anyway.\n");
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return 0;
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}
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static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
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{
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struct msi_desc *entry;
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struct fsl_msi *msi_data;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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if (entry->irq == NO_IRQ)
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continue;
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msi_data = irq_get_chip_data(entry->irq);
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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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return;
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}
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static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
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struct msi_msg *msg,
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struct fsl_msi *fsl_msi_data)
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{
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struct fsl_msi *msi_data = fsl_msi_data;
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struct pci_controller *hose = pci_bus_to_host(pdev->bus);
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u64 base = fsl_pci_immrbar_base(hose);
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msg->address_lo = msi_data->msi_addr_lo + lower_32_bits(base);
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msg->address_hi = msi_data->msi_addr_hi + upper_32_bits(base);
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msg->data = hwirq;
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pr_debug("%s: allocated srs: %d, ibs: %d\n",
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__func__, hwirq / IRQS_PER_MSI_REG, hwirq % IRQS_PER_MSI_REG);
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}
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static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
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{
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int rc, hwirq = -ENOMEM;
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unsigned int virq;
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struct msi_desc *entry;
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struct msi_msg msg;
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struct fsl_msi *msi_data;
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list_for_each_entry(entry, &pdev->msi_list, list) {
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list_for_each_entry(msi_data, &msi_head, list) {
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hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
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if (hwirq >= 0)
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break;
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}
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if (hwirq < 0) {
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rc = hwirq;
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pr_debug("%s: fail allocating msi interrupt\n",
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__func__);
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goto out_free;
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}
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virq = irq_create_mapping(msi_data->irqhost, hwirq);
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if (virq == NO_IRQ) {
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pr_debug("%s: fail mapping hwirq 0x%x\n",
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__func__, hwirq);
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msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
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rc = -ENOSPC;
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goto out_free;
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}
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/* chip_data is msi_data via host->hostdata in host->map() */
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irq_set_msi_desc(virq, entry);
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fsl_compose_msi_msg(pdev, hwirq, &msg, msi_data);
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write_msi_msg(virq, &msg);
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}
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return 0;
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out_free:
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/* free by the caller of this function */
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return rc;
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}
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static void fsl_msi_cascade(unsigned int irq, struct irq_desc *desc)
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{
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struct irq_chip *chip = irq_desc_get_chip(desc);
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struct irq_data *idata = irq_desc_get_irq_data(desc);
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unsigned int cascade_irq;
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struct fsl_msi *msi_data;
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int msir_index = -1;
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u32 msir_value = 0;
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u32 intr_index;
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u32 have_shift = 0;
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struct fsl_msi_cascade_data *cascade_data;
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cascade_data = irq_get_handler_data(irq);
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msi_data = cascade_data->msi_data;
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raw_spin_lock(&desc->lock);
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if ((msi_data->feature & FSL_PIC_IP_MASK) == FSL_PIC_IP_IPIC) {
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if (chip->irq_mask_ack)
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chip->irq_mask_ack(idata);
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else {
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chip->irq_mask(idata);
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chip->irq_ack(idata);
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}
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}
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if (unlikely(irqd_irq_inprogress(idata)))
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goto unlock;
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msir_index = cascade_data->index;
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if (msir_index >= NR_MSI_REG)
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cascade_irq = NO_IRQ;
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irqd_set_chained_irq_inprogress(idata);
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switch (msi_data->feature & FSL_PIC_IP_MASK) {
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case FSL_PIC_IP_MPIC:
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msir_value = fsl_msi_read(msi_data->msi_regs,
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msir_index * 0x10);
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break;
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case FSL_PIC_IP_IPIC:
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msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4);
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break;
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}
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while (msir_value) {
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intr_index = ffs(msir_value) - 1;
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cascade_irq = irq_linear_revmap(msi_data->irqhost,
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msir_index * IRQS_PER_MSI_REG +
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intr_index + have_shift);
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if (cascade_irq != NO_IRQ)
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generic_handle_irq(cascade_irq);
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have_shift += intr_index + 1;
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msir_value = msir_value >> (intr_index + 1);
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}
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irqd_clr_chained_irq_inprogress(idata);
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switch (msi_data->feature & FSL_PIC_IP_MASK) {
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case FSL_PIC_IP_MPIC:
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chip->irq_eoi(idata);
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break;
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case FSL_PIC_IP_IPIC:
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if (!irqd_irq_disabled(idata) && chip->irq_unmask)
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chip->irq_unmask(idata);
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break;
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}
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unlock:
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raw_spin_unlock(&desc->lock);
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}
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static int fsl_of_msi_remove(struct platform_device *ofdev)
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{
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struct fsl_msi *msi = platform_get_drvdata(ofdev);
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int virq, i;
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struct fsl_msi_cascade_data *cascade_data;
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if (msi->list.prev != NULL)
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list_del(&msi->list);
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for (i = 0; i < NR_MSI_REG; i++) {
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virq = msi->msi_virqs[i];
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if (virq != NO_IRQ) {
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cascade_data = irq_get_handler_data(virq);
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kfree(cascade_data);
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irq_dispose_mapping(virq);
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}
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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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kfree(msi);
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return 0;
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}
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static int __devinit fsl_msi_setup_hwirq(struct fsl_msi *msi,
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struct platform_device *dev,
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int offset, int irq_index)
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{
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struct fsl_msi_cascade_data *cascade_data = NULL;
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int virt_msir;
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virt_msir = irq_of_parse_and_map(dev->dev.of_node, irq_index);
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if (virt_msir == NO_IRQ) {
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dev_err(&dev->dev, "%s: Cannot translate IRQ index %d\n",
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__func__, irq_index);
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return 0;
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}
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cascade_data = kzalloc(sizeof(struct fsl_msi_cascade_data), GFP_KERNEL);
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if (!cascade_data) {
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dev_err(&dev->dev, "No memory for MSI cascade data\n");
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return -ENOMEM;
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}
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msi->msi_virqs[irq_index] = virt_msir;
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cascade_data->index = offset + irq_index;
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cascade_data->msi_data = msi;
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irq_set_handler_data(virt_msir, cascade_data);
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irq_set_chained_handler(virt_msir, fsl_msi_cascade);
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return 0;
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}
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static const struct of_device_id fsl_of_msi_ids[];
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static int __devinit fsl_of_msi_probe(struct platform_device *dev)
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{
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const struct of_device_id *match;
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struct fsl_msi *msi;
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struct resource res;
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int err, i, j, irq_index, count;
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int rc;
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const u32 *p;
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struct fsl_msi_feature *features;
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int len;
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u32 offset;
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static const u32 all_avail[] = { 0, NR_MSI_IRQS };
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match = of_match_device(fsl_of_msi_ids, &dev->dev);
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if (!match)
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return -EINVAL;
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features = match->data;
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printk(KERN_DEBUG "Setting up Freescale MSI support\n");
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msi = kzalloc(sizeof(struct fsl_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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platform_set_drvdata(dev, msi);
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msi->irqhost = irq_alloc_host(dev->dev.of_node, IRQ_HOST_MAP_LINEAR,
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NR_MSI_IRQS, &fsl_msi_host_ops, 0);
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if (msi->irqhost == NULL) {
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dev_err(&dev->dev, "No memory for MSI irqhost\n");
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err = -ENOMEM;
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goto error_out;
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}
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/* Get the MSI reg base */
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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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msi->msi_regs = ioremap(res.start, resource_size(&res));
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if (!msi->msi_regs) {
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dev_err(&dev->dev, "ioremap problem failed\n");
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goto error_out;
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}
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msi->feature = features->fsl_pic_ip;
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msi->irqhost->host_data = msi;
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msi->msi_addr_hi = 0x0;
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msi->msi_addr_lo = features->msiir_offset + (res.start & 0xfffff);
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rc = fsl_msi_init_allocator(msi);
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if (rc) {
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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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p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len);
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if (p && len % (2 * sizeof(u32)) != 0) {
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dev_err(&dev->dev, "%s: Malformed msi-available-ranges property\n",
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__func__);
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err = -EINVAL;
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goto error_out;
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}
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if (!p)
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p = all_avail;
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for (irq_index = 0, i = 0; i < len / (2 * sizeof(u32)); i++) {
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if (p[i * 2] % IRQS_PER_MSI_REG ||
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p[i * 2 + 1] % IRQS_PER_MSI_REG) {
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printk(KERN_WARNING "%s: %s: msi available range of %u at %u is not IRQ-aligned\n",
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__func__, dev->dev.of_node->full_name,
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p[i * 2 + 1], p[i * 2]);
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err = -EINVAL;
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goto error_out;
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}
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offset = p[i * 2] / IRQS_PER_MSI_REG;
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count = p[i * 2 + 1] / IRQS_PER_MSI_REG;
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for (j = 0; j < count; j++, irq_index++) {
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err = fsl_msi_setup_hwirq(msi, dev, offset, irq_index);
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if (err)
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goto error_out;
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}
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}
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list_add_tail(&msi->list, &msi_head);
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/* The multiple setting ppc_md.setup_msi_irqs will not harm things */
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if (!ppc_md.setup_msi_irqs) {
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ppc_md.setup_msi_irqs = fsl_setup_msi_irqs;
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ppc_md.teardown_msi_irqs = fsl_teardown_msi_irqs;
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ppc_md.msi_check_device = fsl_msi_check_device;
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} else if (ppc_md.setup_msi_irqs != fsl_setup_msi_irqs) {
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dev_err(&dev->dev, "Different MSI driver already installed!\n");
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err = -ENODEV;
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goto error_out;
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}
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return 0;
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error_out:
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fsl_of_msi_remove(dev);
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return err;
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}
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static const struct fsl_msi_feature mpic_msi_feature = {
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.fsl_pic_ip = FSL_PIC_IP_MPIC,
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.msiir_offset = 0x140,
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};
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static const struct fsl_msi_feature ipic_msi_feature = {
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.fsl_pic_ip = FSL_PIC_IP_IPIC,
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.msiir_offset = 0x38,
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};
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static const struct of_device_id fsl_of_msi_ids[] = {
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{
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.compatible = "fsl,mpic-msi",
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.data = (void *)&mpic_msi_feature,
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},
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{
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.compatible = "fsl,ipic-msi",
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.data = (void *)&ipic_msi_feature,
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},
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{}
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};
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static struct platform_driver fsl_of_msi_driver = {
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.driver = {
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.name = "fsl-msi",
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.owner = THIS_MODULE,
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.of_match_table = fsl_of_msi_ids,
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},
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.probe = fsl_of_msi_probe,
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.remove = fsl_of_msi_remove,
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};
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static __init int fsl_of_msi_init(void)
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{
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return platform_driver_register(&fsl_of_msi_driver);
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}
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subsys_initcall(fsl_of_msi_init);
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