152d018282
Add the platform-specific code for enabling SWIOTLB if needed on P2020DS, MPC85xx DS, and MPC85xx MDS boards as they are capable of having >4G of memory. We determine if we need to enable swiotlb based on how much memory is in the board and if it exceeds 4G or what we can map via PCI inbound windows. Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/*
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* MPC8536 DS Board Setup
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*
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* Copyright 2008 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/pci.h>
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#include <linux/kdev_t.h>
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#include <linux/delay.h>
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#include <linux/seq_file.h>
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#include <linux/interrupt.h>
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#include <linux/of_platform.h>
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#include <linux/lmb.h>
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#include <asm/system.h>
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#include <asm/time.h>
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#include <asm/machdep.h>
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#include <asm/pci-bridge.h>
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#include <mm/mmu_decl.h>
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#include <asm/prom.h>
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#include <asm/udbg.h>
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#include <asm/mpic.h>
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#include <asm/swiotlb.h>
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#include <sysdev/fsl_soc.h>
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#include <sysdev/fsl_pci.h>
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void __init mpc8536_ds_pic_init(void)
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{
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struct mpic *mpic;
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struct resource r;
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struct device_node *np;
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np = of_find_node_by_type(NULL, "open-pic");
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if (np == NULL) {
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printk(KERN_ERR "Could not find open-pic node\n");
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return;
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}
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if (of_address_to_resource(np, 0, &r)) {
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printk(KERN_ERR "Failed to map mpic register space\n");
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of_node_put(np);
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return;
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}
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mpic = mpic_alloc(np, r.start,
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MPIC_PRIMARY | MPIC_WANTS_RESET |
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MPIC_BIG_ENDIAN | MPIC_BROKEN_FRR_NIRQS,
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0, 256, " OpenPIC ");
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BUG_ON(mpic == NULL);
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of_node_put(np);
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mpic_init(mpic);
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}
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/*
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* Setup the architecture
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*/
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static void __init mpc8536_ds_setup_arch(void)
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{
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#ifdef CONFIG_PCI
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struct device_node *np;
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struct pci_controller *hose;
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#endif
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dma_addr_t max = 0xffffffff;
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if (ppc_md.progress)
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ppc_md.progress("mpc8536_ds_setup_arch()", 0);
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#ifdef CONFIG_PCI
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for_each_node_by_type(np, "pci") {
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if (of_device_is_compatible(np, "fsl,mpc8540-pci") ||
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of_device_is_compatible(np, "fsl,mpc8548-pcie")) {
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struct resource rsrc;
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of_address_to_resource(np, 0, &rsrc);
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if ((rsrc.start & 0xfffff) == 0x8000)
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fsl_add_bridge(np, 1);
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else
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fsl_add_bridge(np, 0);
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hose = pci_find_hose_for_OF_device(np);
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max = min(max, hose->dma_window_base_cur +
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hose->dma_window_size);
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}
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}
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#endif
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#ifdef CONFIG_SWIOTLB
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if (lmb_end_of_DRAM() > max) {
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ppc_swiotlb_enable = 1;
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set_pci_dma_ops(&swiotlb_pci_dma_ops);
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}
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#endif
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printk("MPC8536 DS board from Freescale Semiconductor\n");
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}
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static struct of_device_id __initdata mpc8536_ds_ids[] = {
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{ .type = "soc", },
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{ .compatible = "soc", },
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{ .compatible = "simple-bus", },
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{ .compatible = "gianfar", },
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{},
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};
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static int __init mpc8536_ds_publish_devices(void)
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{
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return of_platform_bus_probe(NULL, mpc8536_ds_ids, NULL);
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}
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machine_device_initcall(mpc8536_ds, mpc8536_ds_publish_devices);
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machine_arch_initcall(mpc8536_ds, swiotlb_setup_bus_notifier);
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/*
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* Called very early, device-tree isn't unflattened
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*/
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static int __init mpc8536_ds_probe(void)
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{
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unsigned long root = of_get_flat_dt_root();
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return of_flat_dt_is_compatible(root, "fsl,mpc8536ds");
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}
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define_machine(mpc8536_ds) {
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.name = "MPC8536 DS",
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.probe = mpc8536_ds_probe,
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.setup_arch = mpc8536_ds_setup_arch,
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.init_IRQ = mpc8536_ds_pic_init,
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#ifdef CONFIG_PCI
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.pcibios_fixup_bus = fsl_pcibios_fixup_bus,
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#endif
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.get_irq = mpic_get_irq,
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.restart = fsl_rstcr_restart,
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.calibrate_decr = generic_calibrate_decr,
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.progress = udbg_progress,
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};
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