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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commit c8ffd1356d42223cbb8c86280a083cc3c93e6426, reversing changes made to 2ee6f3a5f7550de3599faef9704e166e5dcace35. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
93 lines
2.0 KiB
C
93 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause
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/*
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* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
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*/
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#define LOG_CATEGORY UCLASS_HWSPINLOCK
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#include <common.h>
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#include <clk.h>
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#include <dm.h>
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#include <hwspinlock.h>
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#include <malloc.h>
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#include <asm/io.h>
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#include <linux/bitops.h>
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#define STM32_MUTEX_COREID BIT(8)
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#define STM32_MUTEX_LOCK_BIT BIT(31)
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#define STM32_MUTEX_NUM_LOCKS 32
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struct stm32mp1_hws_priv {
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fdt_addr_t base;
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};
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static int stm32mp1_lock(struct udevice *dev, int index)
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{
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struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
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u32 status;
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if (index >= STM32_MUTEX_NUM_LOCKS)
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return -EINVAL;
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status = readl(priv->base + index * sizeof(u32));
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if (status == (STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID))
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return -EBUSY;
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writel(STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID,
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priv->base + index * sizeof(u32));
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status = readl(priv->base + index * sizeof(u32));
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if (status != (STM32_MUTEX_LOCK_BIT | STM32_MUTEX_COREID))
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return -EINVAL;
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return 0;
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}
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static int stm32mp1_unlock(struct udevice *dev, int index)
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{
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struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
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if (index >= STM32_MUTEX_NUM_LOCKS)
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return -EINVAL;
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writel(STM32_MUTEX_COREID, priv->base + index * sizeof(u32));
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return 0;
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}
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static int stm32mp1_hwspinlock_probe(struct udevice *dev)
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{
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struct stm32mp1_hws_priv *priv = dev_get_priv(dev);
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struct clk clk;
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int ret;
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priv->base = dev_read_addr(dev);
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if (priv->base == FDT_ADDR_T_NONE)
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return -EINVAL;
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ret = clk_get_by_index(dev, 0, &clk);
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if (ret)
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return ret;
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return clk_enable(&clk);
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}
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static const struct hwspinlock_ops stm32mp1_hwspinlock_ops = {
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.lock = stm32mp1_lock,
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.unlock = stm32mp1_unlock,
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};
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static const struct udevice_id stm32mp1_hwspinlock_ids[] = {
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{ .compatible = "st,stm32-hwspinlock" },
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{}
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};
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U_BOOT_DRIVER(hwspinlock_stm32mp1) = {
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.name = "hwspinlock_stm32mp1",
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.id = UCLASS_HWSPINLOCK,
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.of_match = stm32mp1_hwspinlock_ids,
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.ops = &stm32mp1_hwspinlock_ops,
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.probe = stm32mp1_hwspinlock_probe,
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.priv_auto = sizeof(struct stm32mp1_hws_priv),
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};
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