1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (C) 2017 lvaro Fernndez Rojas <noltari (at) gmail.com> 4 * 5 * Derived from linux/arch/mips/bcm63xx/reset.c: 6 * Copyright (C) 2012 Jonas Gorski <jonas.gorski (at) gmail.com> 7 */ 8 9 #include <common.h> 10 #include <dm.h> 11 #include <errno.h> 12 #include <reset-uclass.h> 13 #include <asm/io.h> 14 15 #define MAX_RESETS 32 16 17 struct bcm6345_reset_priv { 18 void __iomem *regs; 19 }; 20 21 static int bcm6345_reset_assert(struct reset_ctl *rst) 22 { 23 struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev); 24 25 clrbits_be32(priv->regs, BIT(rst->id)); 26 mdelay(20); 27 28 return 0; 29 } 30 31 static int bcm6345_reset_deassert(struct reset_ctl *rst) 32 { 33 struct bcm6345_reset_priv *priv = dev_get_priv(rst->dev); 34 35 setbits_be32(priv->regs, BIT(rst->id)); 36 mdelay(20); 37 38 return 0; 39 } 40 41 static int bcm6345_reset_free(struct reset_ctl *rst) 42 { 43 return 0; 44 } 45 46 static int bcm6345_reset_request(struct reset_ctl *rst) 47 { 48 if (rst->id >= MAX_RESETS) 49 return -EINVAL; 50 51 return bcm6345_reset_assert(rst); 52 } 53 54 struct reset_ops bcm6345_reset_reset_ops = { 55 .free = bcm6345_reset_free, 56 .request = bcm6345_reset_request, 57 .rst_assert = bcm6345_reset_assert, 58 .rst_deassert = bcm6345_reset_deassert, 59 }; 60 61 static const struct udevice_id bcm6345_reset_ids[] = { 62 { .compatible = "brcm,bcm6345-reset" }, 63 { /* sentinel */ } 64 }; 65 66 static int bcm6345_reset_probe(struct udevice *dev) 67 { 68 struct bcm6345_reset_priv *priv = dev_get_priv(dev); 69 70 priv->regs = dev_remap_addr(dev); 71 if (!priv->regs) 72 return -EINVAL; 73 74 return 0; 75 } 76 77 U_BOOT_DRIVER(bcm6345_reset) = { 78 .name = "bcm6345-reset", 79 .id = UCLASS_RESET, 80 .of_match = bcm6345_reset_ids, 81 .ops = &bcm6345_reset_reset_ops, 82 .probe = bcm6345_reset_probe, 83 .priv_auto_alloc_size = sizeof(struct bcm6345_reset_priv), 84 }; 85
