mirror of
https://github.com/AsahiLinux/u-boot
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83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
119 lines
2.5 KiB
C
119 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
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*/
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#include <common.h>
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#include <errno.h>
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#include <asm/io.h>
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#include <asm/types.h>
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#include <asm/arch/flow.h>
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#include <asm/arch/powergate.h>
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#include <asm/arch/tegra.h>
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#define PWRGATE_TOGGLE 0x30
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#define PWRGATE_TOGGLE_START (1 << 8)
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#define REMOVE_CLAMPING 0x34
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#define PWRGATE_STATUS 0x38
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static int tegra_powergate_set(enum tegra_powergate id, bool state)
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{
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u32 value, mask = state ? (1 << id) : 0, old_mask;
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unsigned long start, timeout = 25;
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value = readl(NV_PA_PMC_BASE + PWRGATE_STATUS);
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old_mask = value & (1 << id);
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if (mask == old_mask)
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return 0;
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writel(PWRGATE_TOGGLE_START | id, NV_PA_PMC_BASE + PWRGATE_TOGGLE);
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start = get_timer(0);
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while (get_timer(start) < timeout) {
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value = readl(NV_PA_PMC_BASE + PWRGATE_STATUS);
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if ((value & (1 << id)) == mask)
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return 0;
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}
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return -ETIMEDOUT;
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}
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int tegra_powergate_power_on(enum tegra_powergate id)
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{
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return tegra_powergate_set(id, true);
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}
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int tegra_powergate_power_off(enum tegra_powergate id)
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{
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return tegra_powergate_set(id, false);
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}
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static int tegra_powergate_remove_clamping(enum tegra_powergate id)
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{
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unsigned long value;
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/*
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* The REMOVE_CLAMPING register has the bits for the PCIE and VDEC
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* partitions reversed. This was originally introduced on Tegra20 but
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* has since been carried forward for backwards-compatibility.
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*/
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if (id == TEGRA_POWERGATE_VDEC)
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value = 1 << TEGRA_POWERGATE_PCIE;
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else if (id == TEGRA_POWERGATE_PCIE)
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value = 1 << TEGRA_POWERGATE_VDEC;
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else
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value = 1 << id;
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writel(value, NV_PA_PMC_BASE + REMOVE_CLAMPING);
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return 0;
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}
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static void tegra_powergate_ram_repair(void)
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{
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#ifdef CONFIG_TEGRA124
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struct flow_ctlr *flow = (struct flow_ctlr *)NV_PA_FLOW_BASE;
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/* Request RAM repair for cluster 0 and wait until complete */
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setbits_le32(&flow->ram_repair, RAM_REPAIR_REQ);
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while (!(readl(&flow->ram_repair) & RAM_REPAIR_STS))
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;
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/* Same for cluster 1 */
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setbits_le32(&flow->ram_repair_cluster1, RAM_REPAIR_REQ);
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while (!(readl(&flow->ram_repair_cluster1) & RAM_REPAIR_STS))
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;
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#endif
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}
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int tegra_powergate_sequence_power_up(enum tegra_powergate id,
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enum periph_id periph)
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{
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int err;
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tegra_powergate_ram_repair();
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reset_set_enable(periph, 1);
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err = tegra_powergate_power_on(id);
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if (err < 0)
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return err;
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clock_enable(periph);
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udelay(10);
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err = tegra_powergate_remove_clamping(id);
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if (err < 0)
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return err;
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udelay(10);
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reset_set_enable(periph, 0);
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return 0;
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}
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