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https://github.com/edk2-porting/linux-next.git
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d2207071b3
Tegra's board file currently initializes clocks much earlier than those for most other ARM SoCs. The reason is: * The PMC HW block is involved in the path of some interrupts (i.e. it inverts, or not, the IRQ input pin dedicated to the PMIC). * So, that part of the PMC must be initialized early so that the IRQ polarity is correct. * The PMC initialization is currently monolithic, and the PMC has some clock inputs, so the init routine ends up calling of_clk_get_by_name(), and hence clocks must be set up early too. In order to defer clock initialization to the more typical location, split out the portions of tegra_pmc_init() that are truly IRQ-related into a separate tegra_pmc_init_irq(), which can be called from the machine descriptor's .init_irq() function, and defer the rest until the machine descriptor's .init_machine() function. This allows the clock initiliazation to happen from the machine descriptor's .init_time() function, as is typical. Signed-off-by: Stephen Warren <swarren@nvidia.com>
138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/*
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* NVIDIA Tegra SoC device tree board support
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*
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* Copyright (C) 2011, 2013, NVIDIA Corporation
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* Copyright (C) 2010 Secret Lab Technologies, Ltd.
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* Copyright (C) 2010 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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*/
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#include <linux/clocksource.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/serial_8250.h>
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#include <linux/clk.h>
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#include <linux/dma-mapping.h>
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#include <linux/irqdomain.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_fdt.h>
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#include <linux/of_platform.h>
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#include <linux/pda_power.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#include <linux/sys_soc.h>
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#include <linux/usb/tegra_usb_phy.h>
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#include <linux/clk-provider.h>
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#include <linux/clk/tegra.h>
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#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <asm/mach/time.h>
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#include <asm/setup.h>
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#include "board.h"
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#include "common.h"
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#include "fuse.h"
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#include "iomap.h"
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#include "pmc.h"
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static void __init tegra_dt_init(void)
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{
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struct soc_device_attribute *soc_dev_attr;
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struct soc_device *soc_dev;
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struct device *parent = NULL;
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tegra_pmc_init();
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tegra_clocks_apply_init_table();
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soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
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if (!soc_dev_attr)
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goto out;
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soc_dev_attr->family = kasprintf(GFP_KERNEL, "Tegra");
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soc_dev_attr->revision = kasprintf(GFP_KERNEL, "%d", tegra_revision);
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soc_dev_attr->soc_id = kasprintf(GFP_KERNEL, "%d", tegra_chip_id);
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soc_dev = soc_device_register(soc_dev_attr);
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if (IS_ERR(soc_dev)) {
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kfree(soc_dev_attr->family);
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kfree(soc_dev_attr->revision);
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kfree(soc_dev_attr->soc_id);
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kfree(soc_dev_attr);
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goto out;
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}
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parent = soc_device_to_device(soc_dev);
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/*
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* Finished with the static registrations now; fill in the missing
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* devices
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*/
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out:
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of_platform_populate(NULL, of_default_bus_match_table, NULL, parent);
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}
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static void __init tegra_dt_init_time(void)
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{
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of_clk_init(NULL);
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clocksource_of_init();
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}
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static void __init paz00_init(void)
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{
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if (IS_ENABLED(CONFIG_ARCH_TEGRA_2x_SOC))
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tegra_paz00_wifikill_init();
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}
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static struct {
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char *machine;
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void (*init)(void);
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} board_init_funcs[] = {
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{ "compal,paz00", paz00_init },
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};
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static void __init tegra_dt_init_late(void)
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{
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int i;
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tegra_init_late();
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for (i = 0; i < ARRAY_SIZE(board_init_funcs); i++) {
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if (of_machine_is_compatible(board_init_funcs[i].machine)) {
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board_init_funcs[i].init();
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break;
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}
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}
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}
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static const char * const tegra_dt_board_compat[] = {
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"nvidia,tegra114",
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"nvidia,tegra30",
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"nvidia,tegra20",
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NULL
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};
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DT_MACHINE_START(TEGRA_DT, "NVIDIA Tegra SoC (Flattened Device Tree)")
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.map_io = tegra_map_common_io,
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.smp = smp_ops(tegra_smp_ops),
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.init_early = tegra_init_early,
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.init_irq = tegra_dt_init_irq,
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.init_time = tegra_dt_init_time,
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.init_machine = tegra_dt_init,
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.init_late = tegra_dt_init_late,
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.restart = tegra_assert_system_reset,
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.dt_compat = tegra_dt_board_compat,
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MACHINE_END
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