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The HSDK v1 periphery IPs can be reset by accessing some registers from the CGU block. The list of available reset lines is documented in the DT bindings. Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
138 lines
3.5 KiB
C
138 lines
3.5 KiB
C
/*
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* Copyright (C) 2017 Synopsys.
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*
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* Synopsys HSDKv1 SDP reset driver.
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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/delay.h>
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#include <linux/io.h>
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#include <linux/iopoll.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/reset-controller.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#define to_hsdkv1_rst(p) container_of((p), struct hsdkv1_rst, rcdev)
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struct hsdkv1_rst {
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void __iomem *regs_ctl;
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void __iomem *regs_rst;
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spinlock_t lock;
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struct reset_controller_dev rcdev;
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};
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static const u32 rst_map[] = {
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BIT(16), /* APB_RST */
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BIT(17), /* AXI_RST */
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BIT(18), /* ETH_RST */
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BIT(19), /* USB_RST */
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BIT(20), /* SDIO_RST */
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BIT(21), /* HDMI_RST */
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BIT(22), /* GFX_RST */
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BIT(25), /* DMAC_RST */
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BIT(31), /* EBI_RST */
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};
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#define HSDK_MAX_RESETS ARRAY_SIZE(rst_map)
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#define CGU_SYS_RST_CTRL 0x0
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#define CGU_IP_SW_RESET 0x0
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#define CGU_IP_SW_RESET_DELAY_SHIFT 16
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#define CGU_IP_SW_RESET_DELAY_MASK GENMASK(31, CGU_IP_SW_RESET_DELAY_SHIFT)
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#define CGU_IP_SW_RESET_DELAY 0
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#define CGU_IP_SW_RESET_RESET BIT(0)
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#define SW_RESET_TIMEOUT 10000
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static void hsdkv1_reset_config(struct hsdkv1_rst *rst, unsigned long id)
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{
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writel(rst_map[id], rst->regs_ctl + CGU_SYS_RST_CTRL);
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}
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static int hsdkv1_reset_do(struct hsdkv1_rst *rst)
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{
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u32 reg;
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reg = readl(rst->regs_rst + CGU_IP_SW_RESET);
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reg &= ~CGU_IP_SW_RESET_DELAY_MASK;
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reg |= CGU_IP_SW_RESET_DELAY << CGU_IP_SW_RESET_DELAY_SHIFT;
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reg |= CGU_IP_SW_RESET_RESET;
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writel(reg, rst->regs_rst + CGU_IP_SW_RESET);
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/* wait till reset bit is back to 0 */
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return readl_poll_timeout_atomic(rst->regs_rst + CGU_IP_SW_RESET, reg,
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!(reg & CGU_IP_SW_RESET_RESET), 5, SW_RESET_TIMEOUT);
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}
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static int hsdkv1_reset_reset(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct hsdkv1_rst *rst = to_hsdkv1_rst(rcdev);
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unsigned long flags;
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int ret;
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spin_lock_irqsave(&rst->lock, flags);
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hsdkv1_reset_config(rst, id);
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ret = hsdkv1_reset_do(rst);
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spin_unlock_irqrestore(&rst->lock, flags);
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return ret;
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}
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static const struct reset_control_ops hsdkv1_reset_ops = {
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.reset = hsdkv1_reset_reset,
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};
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static int hsdkv1_reset_probe(struct platform_device *pdev)
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{
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struct hsdkv1_rst *rst;
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struct resource *mem;
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rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL);
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if (!rst)
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return -ENOMEM;
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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rst->regs_ctl = devm_ioremap_resource(&pdev->dev, mem);
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if (IS_ERR(rst->regs_ctl))
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return PTR_ERR(rst->regs_ctl);
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mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem);
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if (IS_ERR(rst->regs_rst))
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return PTR_ERR(rst->regs_rst);
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spin_lock_init(&rst->lock);
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rst->rcdev.owner = THIS_MODULE;
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rst->rcdev.ops = &hsdkv1_reset_ops;
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rst->rcdev.of_node = pdev->dev.of_node;
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rst->rcdev.nr_resets = HSDK_MAX_RESETS;
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rst->rcdev.of_reset_n_cells = 1;
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return reset_controller_register(&rst->rcdev);
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}
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static const struct of_device_id hsdkv1_reset_dt_match[] = {
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{ .compatible = "snps,hsdk-v1.0-reset" },
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{ },
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};
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static struct platform_driver hsdkv1_reset_driver = {
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.probe = hsdkv1_reset_probe,
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.driver = {
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.name = "hsdk-v1.0-reset",
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.of_match_table = hsdkv1_reset_dt_match,
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},
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};
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builtin_platform_driver(hsdkv1_reset_driver);
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MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>");
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MODULE_DESCRIPTION("Synopsys HSDKv1 SDP reset driver");
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MODULE_LICENSE("GPL v2");
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