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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * HSDK SoC Reset Controller driver
- *
- * Copyright (C) 2019 Synopsys, Inc. All rights reserved.
- * Author: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
- */
- #include <log.h>
- #include <asm/io.h>
- #include <common.h>
- #include <dm.h>
- #include <linux/bitops.h>
- #include <linux/iopoll.h>
- #include <reset-uclass.h>
- struct hsdk_rst {
- void __iomem *regs_ctl;
- void __iomem *regs_rst;
- };
- static const u32 rst_map[] = {
- BIT(16), /* APB_RST */
- BIT(17), /* AXI_RST */
- BIT(18), /* ETH_RST */
- BIT(19), /* USB_RST */
- BIT(20), /* SDIO_RST */
- BIT(21), /* HDMI_RST */
- BIT(22), /* GFX_RST */
- BIT(25), /* DMAC_RST */
- BIT(31), /* EBI_RST */
- };
- #define HSDK_MAX_RESETS ARRAY_SIZE(rst_map)
- #define CGU_SYS_RST_CTRL 0x0
- #define CGU_IP_SW_RESET 0x0
- #define CGU_IP_SW_RESET_DELAY_SHIFT 16
- #define CGU_IP_SW_RESET_DELAY_MASK GENMASK(31, CGU_IP_SW_RESET_DELAY_SHIFT)
- #define CGU_IP_SW_RESET_DELAY 0
- #define CGU_IP_SW_RESET_RESET BIT(0)
- #define SW_RESET_TIMEOUT 10000
- static void hsdk_reset_config(struct hsdk_rst *rst, unsigned long id)
- {
- writel(rst_map[id], rst->regs_ctl + CGU_SYS_RST_CTRL);
- }
- static int hsdk_reset_do(struct hsdk_rst *rst)
- {
- u32 reg;
- reg = readl(rst->regs_rst + CGU_IP_SW_RESET);
- reg &= ~CGU_IP_SW_RESET_DELAY_MASK;
- reg |= CGU_IP_SW_RESET_DELAY << CGU_IP_SW_RESET_DELAY_SHIFT;
- reg |= CGU_IP_SW_RESET_RESET;
- writel(reg, rst->regs_rst + CGU_IP_SW_RESET);
- /* wait till reset bit is back to 0 */
- return readl_poll_timeout(rst->regs_rst + CGU_IP_SW_RESET, reg,
- !(reg & CGU_IP_SW_RESET_RESET), SW_RESET_TIMEOUT);
- }
- static int hsdk_reset_reset(struct reset_ctl *rst_ctl)
- {
- struct udevice *dev = rst_ctl->dev;
- struct hsdk_rst *rst = dev_get_priv(dev);
- if (rst_ctl->id >= HSDK_MAX_RESETS)
- return -EINVAL;
- debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, rst_ctl,
- rst_ctl->dev, rst_ctl->id);
- hsdk_reset_config(rst, rst_ctl->id);
- return hsdk_reset_do(rst);
- }
- static int hsdk_reset_noop(struct reset_ctl *rst_ctl)
- {
- return 0;
- }
- static const struct reset_ops hsdk_reset_ops = {
- .request = hsdk_reset_noop,
- .rfree = hsdk_reset_noop,
- .rst_assert = hsdk_reset_noop,
- .rst_deassert = hsdk_reset_reset,
- };
- static const struct udevice_id hsdk_reset_dt_match[] = {
- { .compatible = "snps,hsdk-reset" },
- { },
- };
- static int hsdk_reset_probe(struct udevice *dev)
- {
- struct hsdk_rst *rst = dev_get_priv(dev);
- rst->regs_ctl = dev_remap_addr_index(dev, 0);
- if (!rst->regs_ctl)
- return -EINVAL;
- rst->regs_rst = dev_remap_addr_index(dev, 1);
- if (!rst->regs_rst)
- return -EINVAL;
- return 0;
- }
- U_BOOT_DRIVER(hsdk_reset) = {
- .name = "hsdk-reset",
- .id = UCLASS_RESET,
- .of_match = hsdk_reset_dt_match,
- .ops = &hsdk_reset_ops,
- .probe = hsdk_reset_probe,
- .priv_auto = sizeof(struct hsdk_rst),
- };
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