5686a1e5aa
Until now, the mvebu-mbus was guessing by itself whether hardware I/O coherency was available or not by poking into the Device Tree to see if the coherency fabric Device Tree node was present or not. However, on some upcoming SoCs, the presence or absence of the coherency fabric DT node isn't sufficient: in CONFIG_SMP, the coherency can be enabled, but not in !CONFIG_SMP. In order to clean this up, the mvebu_mbus_dt_init() function is extended to get a boolean argument telling whether coherency is enabled or not. Therefore, the logic to decide whether coherency is available or not now belongs to the core SoC code instead of the mvebu-mbus driver itself, which is much better. Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1397483228-25625-4-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
141 lines
3.7 KiB
C
141 lines
3.7 KiB
C
/*
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* Device Tree support for Armada 370 and XP platforms.
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*
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* Copyright (C) 2012 Marvell
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*
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* Lior Amsalem <alior@marvell.com>
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* Gregory CLEMENT <gregory.clement@free-electrons.com>
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* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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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/clk-provider.h>
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#include <linux/of_address.h>
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#include <linux/of_platform.h>
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#include <linux/io.h>
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#include <linux/clocksource.h>
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#include <linux/dma-mapping.h>
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#include <linux/mbus.h>
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#include <linux/signal.h>
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#include <linux/slab.h>
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#include <asm/hardware/cache-l2x0.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/map.h>
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#include <asm/mach/time.h>
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#include "armada-370-xp.h"
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#include "common.h"
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#include "coherency.h"
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#include "mvebu-soc-id.h"
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/*
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* Early versions of Armada 375 SoC have a bug where the BootROM
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* leaves an external data abort pending. The kernel is hit by this
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* data abort as soon as it enters userspace, because it unmasks the
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* data aborts at this moment. We register a custom abort handler
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* below to ignore the first data abort to work around this
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* problem.
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*/
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static int armada_375_external_abort_wa(unsigned long addr, unsigned int fsr,
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struct pt_regs *regs)
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{
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static int ignore_first;
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if (!ignore_first && fsr == 0x1406) {
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ignore_first = 1;
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return 0;
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}
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return 1;
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}
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static void __init mvebu_timer_and_clk_init(void)
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{
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of_clk_init(NULL);
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clocksource_of_init();
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coherency_init();
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BUG_ON(mvebu_mbus_dt_init(coherency_available()));
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#ifdef CONFIG_CACHE_L2X0
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l2x0_of_init(0, ~0UL);
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#endif
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if (of_machine_is_compatible("marvell,armada375"))
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hook_fault_code(16 + 6, armada_375_external_abort_wa, SIGBUS, 0,
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"imprecise external abort");
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}
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static void __init i2c_quirk(void)
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{
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struct device_node *np;
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u32 dev, rev;
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/*
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* Only revisons more recent than A0 support the offload
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* mechanism. We can exit only if we are sure that we can
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* get the SoC revision and it is more recent than A0.
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*/
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if (mvebu_get_soc_id(&rev, &dev) == 0 && dev > MV78XX0_A0_REV)
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return;
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for_each_compatible_node(np, NULL, "marvell,mv78230-i2c") {
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struct property *new_compat;
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new_compat = kzalloc(sizeof(*new_compat), GFP_KERNEL);
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new_compat->name = kstrdup("compatible", GFP_KERNEL);
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new_compat->length = sizeof("marvell,mv78230-a0-i2c");
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new_compat->value = kstrdup("marvell,mv78230-a0-i2c",
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GFP_KERNEL);
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of_update_property(np, new_compat);
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}
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return;
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}
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static void __init mvebu_dt_init(void)
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{
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if (of_machine_is_compatible("plathome,openblocks-ax3-4"))
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i2c_quirk();
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of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
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}
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static const char * const armada_370_xp_dt_compat[] = {
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"marvell,armada-370-xp",
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NULL,
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};
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DT_MACHINE_START(ARMADA_370_XP_DT, "Marvell Armada 370/XP (Device Tree)")
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.smp = smp_ops(armada_xp_smp_ops),
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.init_machine = mvebu_dt_init,
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.init_time = mvebu_timer_and_clk_init,
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.restart = mvebu_restart,
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.dt_compat = armada_370_xp_dt_compat,
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MACHINE_END
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static const char * const armada_375_dt_compat[] = {
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"marvell,armada375",
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NULL,
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};
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DT_MACHINE_START(ARMADA_375_DT, "Marvell Armada 375 (Device Tree)")
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.init_time = mvebu_timer_and_clk_init,
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.restart = mvebu_restart,
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.dt_compat = armada_375_dt_compat,
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MACHINE_END
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static const char * const armada_38x_dt_compat[] = {
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"marvell,armada380",
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"marvell,armada385",
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NULL,
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};
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DT_MACHINE_START(ARMADA_38X_DT, "Marvell Armada 380/385 (Device Tree)")
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.init_time = mvebu_timer_and_clk_init,
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.restart = mvebu_restart,
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.dt_compat = armada_38x_dt_compat,
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MACHINE_END
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