1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2017 Google, Inc 4 */ 5 6 #include <common.h> 7 #include <dm.h> 8 #include <misc.h> 9 #include <reset.h> 10 #include <reset-uclass.h> 11 #include <wdt.h> 12 #include <asm/io.h> 13 #include <asm/arch/scu_ast2500.h> 14 #include <asm/arch/wdt.h> 15 16 struct aspeed_reset_priv { 17 /* WDT used to perform resets. */ 18 struct udevice *wdt; 19 struct ast2500_scu *scu; 20 }; 21 22 static int aspeed_ofdata_to_platdata(struct udevice *dev) 23 { 24 struct aspeed_reset_priv *priv = dev_get_priv(dev); 25 int ret; 26 27 ret = uclass_get_device_by_phandle(UCLASS_WDT, dev, "aspeed,wdt", 28 &priv->wdt); 29 if (ret) { 30 debug("%s: can't find WDT for reset controller", __func__); 31 return ret; 32 } 33 34 return 0; 35 } 36 37 static int aspeed_reset_assert(struct reset_ctl *reset_ctl) 38 { 39 struct aspeed_reset_priv *priv = dev_get_priv(reset_ctl->dev); 40 u32 reset_mode, reset_mask; 41 bool reset_sdram; 42 int ret; 43 44 /* 45 * To reset SDRAM, a specifal flag in SYSRESET register 46 * needs to be enabled first 47 */ 48 reset_mode = ast_reset_mode_from_flags(reset_ctl->id); 49 reset_mask = ast_reset_mask_from_flags(reset_ctl->id); 50 reset_sdram = reset_mode == WDT_CTRL_RESET_SOC && 51 (reset_mask & WDT_RESET_SDRAM); 52 #if 0 53 if (reset_sdram) { 54 ast_scu_unlock(priv->scu); 55 setbits_le32(&priv->scu->sysreset_ctrl1, 56 SCU_SYSRESET_SDRAM_WDT); 57 ret = wdt_expire_now(priv->wdt, reset_ctl->id); 58 clrbits_le32(&priv->scu->sysreset_ctrl1, 59 SCU_SYSRESET_SDRAM_WDT); 60 ast_scu_lock(priv->scu); 61 } else { 62 ret = wdt_expire_now(priv->wdt, reset_ctl->id); 63 } 64 #endif 65 return ret; 66 } 67 68 static int aspeed_reset_request(struct reset_ctl *reset_ctl) 69 { 70 debug("%s(reset_ctl=%p) (dev=%p, id=%lu)\n", __func__, reset_ctl, 71 reset_ctl->dev, reset_ctl->id); 72 73 return 0; 74 } 75 76 static int aspeed_reset_probe(struct udevice *dev) 77 { 78 struct aspeed_reset_priv *priv = dev_get_priv(dev); 79 80 priv->scu = ast_get_scu(); 81 82 return 0; 83 } 84 85 static const struct udevice_id aspeed_reset_ids[] = { 86 { .compatible = "aspeed,ast2500-reset" }, 87 { } 88 }; 89 90 struct reset_ops aspeed_reset_ops = { 91 .rst_assert = aspeed_reset_assert, 92 .request = aspeed_reset_request, 93 }; 94 95 U_BOOT_DRIVER(aspeed_reset) = { 96 .name = "aspeed_reset", 97 .id = UCLASS_RESET, 98 .of_match = aspeed_reset_ids, 99 .probe = aspeed_reset_probe, 100 .ops = &aspeed_reset_ops, 101 .ofdata_to_platdata = aspeed_ofdata_to_platdata, 102 .priv_auto_alloc_size = sizeof(struct aspeed_reset_priv), 103 }; 104