113541226SVineet Gupta /* 213541226SVineet Gupta * Copyright (C) 2017 Synopsys. 313541226SVineet Gupta * 413541226SVineet Gupta * Synopsys HSDK Development platform reset driver. 513541226SVineet Gupta * 613541226SVineet Gupta * This file is licensed under the terms of the GNU General Public 713541226SVineet Gupta * License version 2. This program is licensed "as is" without any 813541226SVineet Gupta * warranty of any kind, whether express or implied. 913541226SVineet Gupta */ 1013541226SVineet Gupta 1113541226SVineet Gupta #include <linux/delay.h> 1213541226SVineet Gupta #include <linux/io.h> 1313541226SVineet Gupta #include <linux/iopoll.h> 1413541226SVineet Gupta #include <linux/module.h> 1513541226SVineet Gupta #include <linux/of.h> 1613541226SVineet Gupta #include <linux/platform_device.h> 1713541226SVineet Gupta #include <linux/reset-controller.h> 1813541226SVineet Gupta #include <linux/slab.h> 1913541226SVineet Gupta #include <linux/types.h> 2013541226SVineet Gupta 2113541226SVineet Gupta #define to_hsdk_rst(p) container_of((p), struct hsdk_rst, rcdev) 2213541226SVineet Gupta 2313541226SVineet Gupta struct hsdk_rst { 2413541226SVineet Gupta void __iomem *regs_ctl; 2513541226SVineet Gupta void __iomem *regs_rst; 2613541226SVineet Gupta spinlock_t lock; 2713541226SVineet Gupta struct reset_controller_dev rcdev; 2813541226SVineet Gupta }; 2913541226SVineet Gupta 3013541226SVineet Gupta static const u32 rst_map[] = { 3113541226SVineet Gupta BIT(16), /* APB_RST */ 3213541226SVineet Gupta BIT(17), /* AXI_RST */ 3313541226SVineet Gupta BIT(18), /* ETH_RST */ 3413541226SVineet Gupta BIT(19), /* USB_RST */ 3513541226SVineet Gupta BIT(20), /* SDIO_RST */ 3613541226SVineet Gupta BIT(21), /* HDMI_RST */ 3713541226SVineet Gupta BIT(22), /* GFX_RST */ 3813541226SVineet Gupta BIT(25), /* DMAC_RST */ 3913541226SVineet Gupta BIT(31), /* EBI_RST */ 4013541226SVineet Gupta }; 4113541226SVineet Gupta 4213541226SVineet Gupta #define HSDK_MAX_RESETS ARRAY_SIZE(rst_map) 4313541226SVineet Gupta 4413541226SVineet Gupta #define CGU_SYS_RST_CTRL 0x0 4513541226SVineet Gupta #define CGU_IP_SW_RESET 0x0 4613541226SVineet Gupta #define CGU_IP_SW_RESET_DELAY_SHIFT 16 4713541226SVineet Gupta #define CGU_IP_SW_RESET_DELAY_MASK GENMASK(31, CGU_IP_SW_RESET_DELAY_SHIFT) 4813541226SVineet Gupta #define CGU_IP_SW_RESET_DELAY 0 4913541226SVineet Gupta #define CGU_IP_SW_RESET_RESET BIT(0) 5013541226SVineet Gupta #define SW_RESET_TIMEOUT 10000 5113541226SVineet Gupta 5213541226SVineet Gupta static void hsdk_reset_config(struct hsdk_rst *rst, unsigned long id) 5313541226SVineet Gupta { 5413541226SVineet Gupta writel(rst_map[id], rst->regs_ctl + CGU_SYS_RST_CTRL); 5513541226SVineet Gupta } 5613541226SVineet Gupta 5713541226SVineet Gupta static int hsdk_reset_do(struct hsdk_rst *rst) 5813541226SVineet Gupta { 5913541226SVineet Gupta u32 reg; 6013541226SVineet Gupta 6113541226SVineet Gupta reg = readl(rst->regs_rst + CGU_IP_SW_RESET); 6213541226SVineet Gupta reg &= ~CGU_IP_SW_RESET_DELAY_MASK; 6313541226SVineet Gupta reg |= CGU_IP_SW_RESET_DELAY << CGU_IP_SW_RESET_DELAY_SHIFT; 6413541226SVineet Gupta reg |= CGU_IP_SW_RESET_RESET; 6513541226SVineet Gupta writel(reg, rst->regs_rst + CGU_IP_SW_RESET); 6613541226SVineet Gupta 6713541226SVineet Gupta /* wait till reset bit is back to 0 */ 6813541226SVineet Gupta return readl_poll_timeout_atomic(rst->regs_rst + CGU_IP_SW_RESET, reg, 6913541226SVineet Gupta !(reg & CGU_IP_SW_RESET_RESET), 5, SW_RESET_TIMEOUT); 7013541226SVineet Gupta } 7113541226SVineet Gupta 7213541226SVineet Gupta static int hsdk_reset_reset(struct reset_controller_dev *rcdev, 7313541226SVineet Gupta unsigned long id) 7413541226SVineet Gupta { 7513541226SVineet Gupta struct hsdk_rst *rst = to_hsdk_rst(rcdev); 7613541226SVineet Gupta unsigned long flags; 7713541226SVineet Gupta int ret; 7813541226SVineet Gupta 7913541226SVineet Gupta spin_lock_irqsave(&rst->lock, flags); 8013541226SVineet Gupta hsdk_reset_config(rst, id); 8113541226SVineet Gupta ret = hsdk_reset_do(rst); 8213541226SVineet Gupta spin_unlock_irqrestore(&rst->lock, flags); 8313541226SVineet Gupta 8413541226SVineet Gupta return ret; 8513541226SVineet Gupta } 8613541226SVineet Gupta 8713541226SVineet Gupta static const struct reset_control_ops hsdk_reset_ops = { 8813541226SVineet Gupta .reset = hsdk_reset_reset, 8913541226SVineet Gupta }; 9013541226SVineet Gupta 9113541226SVineet Gupta static int hsdk_reset_probe(struct platform_device *pdev) 9213541226SVineet Gupta { 9313541226SVineet Gupta struct hsdk_rst *rst; 9413541226SVineet Gupta struct resource *mem; 9513541226SVineet Gupta 9613541226SVineet Gupta rst = devm_kzalloc(&pdev->dev, sizeof(*rst), GFP_KERNEL); 9713541226SVineet Gupta if (!rst) 9813541226SVineet Gupta return -ENOMEM; 9913541226SVineet Gupta 10013541226SVineet Gupta mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); 10113541226SVineet Gupta rst->regs_ctl = devm_ioremap_resource(&pdev->dev, mem); 10213541226SVineet Gupta if (IS_ERR(rst->regs_ctl)) 10313541226SVineet Gupta return PTR_ERR(rst->regs_ctl); 10413541226SVineet Gupta 10513541226SVineet Gupta mem = platform_get_resource(pdev, IORESOURCE_MEM, 1); 10613541226SVineet Gupta rst->regs_rst = devm_ioremap_resource(&pdev->dev, mem); 10713541226SVineet Gupta if (IS_ERR(rst->regs_rst)) 10813541226SVineet Gupta return PTR_ERR(rst->regs_rst); 10913541226SVineet Gupta 11013541226SVineet Gupta spin_lock_init(&rst->lock); 11113541226SVineet Gupta 11213541226SVineet Gupta rst->rcdev.owner = THIS_MODULE; 11313541226SVineet Gupta rst->rcdev.ops = &hsdk_reset_ops; 11413541226SVineet Gupta rst->rcdev.of_node = pdev->dev.of_node; 11513541226SVineet Gupta rst->rcdev.nr_resets = HSDK_MAX_RESETS; 11613541226SVineet Gupta rst->rcdev.of_reset_n_cells = 1; 11713541226SVineet Gupta 11813541226SVineet Gupta return reset_controller_register(&rst->rcdev); 11913541226SVineet Gupta } 12013541226SVineet Gupta 12113541226SVineet Gupta static const struct of_device_id hsdk_reset_dt_match[] = { 12213541226SVineet Gupta { .compatible = "snps,hsdk-reset" }, 12313541226SVineet Gupta { }, 12413541226SVineet Gupta }; 12513541226SVineet Gupta 12613541226SVineet Gupta static struct platform_driver hsdk_reset_driver = { 12713541226SVineet Gupta .probe = hsdk_reset_probe, 12813541226SVineet Gupta .driver = { 12913541226SVineet Gupta .name = "hsdk-reset", 13013541226SVineet Gupta .of_match_table = hsdk_reset_dt_match, 13113541226SVineet Gupta }, 13213541226SVineet Gupta }; 13313541226SVineet Gupta builtin_platform_driver(hsdk_reset_driver); 13413541226SVineet Gupta 13513541226SVineet Gupta MODULE_AUTHOR("Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>"); 13613541226SVineet Gupta MODULE_DESCRIPTION("Synopsys HSDK SDP reset driver"); 13713541226SVineet Gupta MODULE_LICENSE("GPL v2"); 138