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eca3930163
of_platform_bus was being used in the same manner as the platform_bus. The only difference being that of_platform_bus devices are generated from data in the device tree, and platform_bus devices are usually statically allocated in platform code. Having them separate causes the problem of device drivers having to be registered twice if it was possible for the same device to appear on either bus. This patch removes of_platform_bus_type and registers all of_platform bus devices and drivers on the platform bus instead. A previous patch made the of_device structure an alias for the platform_device structure, and a shim is used to adapt of_platform_drivers to the platform bus. After all of of_platform_bus drivers are converted to be normal platform drivers, the shim code can be removed. Signed-off-by: Grant Likely <grant.likely@secretlab.ca> Acked-by: David S. Miller <davem@davemloft.net>
117 lines
3.1 KiB
C
117 lines
3.1 KiB
C
/*
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* Support for IOMMU on Celleb platform.
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*
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* (C) Copyright 2006-2007 TOSHIBA CORPORATION
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/pci.h>
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#include <linux/of_platform.h>
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#include <asm/machdep.h>
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#include "beat_wrapper.h"
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#define DMA_FLAGS 0xf800000000000000UL /* r/w permitted, coherency required,
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strongest order */
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static int __init find_dma_window(u64 *io_space_id, u64 *ioid,
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u64 *base, u64 *size, u64 *io_page_size)
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{
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struct device_node *dn;
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const unsigned long *dma_window;
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for_each_node_by_type(dn, "ioif") {
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dma_window = of_get_property(dn, "toshiba,dma-window", NULL);
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if (dma_window) {
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*io_space_id = (dma_window[0] >> 32) & 0xffffffffUL;
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*ioid = dma_window[0] & 0x7ffUL;
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*base = dma_window[1];
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*size = dma_window[2];
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*io_page_size = 1 << dma_window[3];
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of_node_put(dn);
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return 1;
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}
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}
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return 0;
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}
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static unsigned long celleb_dma_direct_offset;
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static void __init celleb_init_direct_mapping(void)
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{
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u64 lpar_addr, io_addr;
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u64 io_space_id, ioid, dma_base, dma_size, io_page_size;
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if (!find_dma_window(&io_space_id, &ioid, &dma_base, &dma_size,
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&io_page_size)) {
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pr_info("No dma window found !\n");
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return;
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}
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for (lpar_addr = 0; lpar_addr < dma_size; lpar_addr += io_page_size) {
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io_addr = lpar_addr + dma_base;
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(void)beat_put_iopte(io_space_id, io_addr, lpar_addr,
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ioid, DMA_FLAGS);
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}
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celleb_dma_direct_offset = dma_base;
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}
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static void celleb_dma_dev_setup(struct device *dev)
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{
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dev->archdata.dma_ops = get_pci_dma_ops();
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set_dma_offset(dev, celleb_dma_direct_offset);
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}
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static void celleb_pci_dma_dev_setup(struct pci_dev *pdev)
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{
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celleb_dma_dev_setup(&pdev->dev);
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}
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static int celleb_of_bus_notify(struct notifier_block *nb,
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unsigned long action, void *data)
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{
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struct device *dev = data;
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/* We are only intereted in device addition */
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if (action != BUS_NOTIFY_ADD_DEVICE)
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return 0;
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celleb_dma_dev_setup(dev);
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return 0;
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}
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static struct notifier_block celleb_of_bus_notifier = {
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.notifier_call = celleb_of_bus_notify
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};
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static int __init celleb_init_iommu(void)
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{
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celleb_init_direct_mapping();
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set_pci_dma_ops(&dma_direct_ops);
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ppc_md.pci_dma_dev_setup = celleb_pci_dma_dev_setup;
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bus_register_notifier(&platform_bus_type, &celleb_of_bus_notifier);
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return 0;
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}
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machine_arch_initcall(celleb_beat, celleb_init_iommu);
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