1*99ba4308SJagan Teki // SPDX-License-Identifier: (GPL-2.0+ OR MIT)
2*99ba4308SJagan Teki /*
3*99ba4308SJagan Teki * Copyright (C) 2018 Amarula Solutions.
4*99ba4308SJagan Teki * Author: Jagan Teki <jagan@amarulasolutions.com>
5*99ba4308SJagan Teki */
6*99ba4308SJagan Teki
7*99ba4308SJagan Teki #include <common.h>
8*99ba4308SJagan Teki #include <dm.h>
9*99ba4308SJagan Teki #include <errno.h>
10*99ba4308SJagan Teki #include <reset-uclass.h>
11*99ba4308SJagan Teki #include <asm/io.h>
12*99ba4308SJagan Teki #include <dm/lists.h>
13*99ba4308SJagan Teki #include <linux/log2.h>
14*99ba4308SJagan Teki #include <asm/arch/ccu.h>
15*99ba4308SJagan Teki
16*99ba4308SJagan Teki struct sunxi_reset_priv {
17*99ba4308SJagan Teki void *base;
18*99ba4308SJagan Teki ulong count;
19*99ba4308SJagan Teki const struct ccu_desc *desc;
20*99ba4308SJagan Teki };
21*99ba4308SJagan Teki
priv_to_reset(struct sunxi_reset_priv * priv,unsigned long id)22*99ba4308SJagan Teki static const struct ccu_reset *priv_to_reset(struct sunxi_reset_priv *priv,
23*99ba4308SJagan Teki unsigned long id)
24*99ba4308SJagan Teki {
25*99ba4308SJagan Teki return &priv->desc->resets[id];
26*99ba4308SJagan Teki }
27*99ba4308SJagan Teki
sunxi_reset_request(struct reset_ctl * reset_ctl)28*99ba4308SJagan Teki static int sunxi_reset_request(struct reset_ctl *reset_ctl)
29*99ba4308SJagan Teki {
30*99ba4308SJagan Teki struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
31*99ba4308SJagan Teki
32*99ba4308SJagan Teki debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
33*99ba4308SJagan Teki
34*99ba4308SJagan Teki if (reset_ctl->id >= priv->count)
35*99ba4308SJagan Teki return -EINVAL;
36*99ba4308SJagan Teki
37*99ba4308SJagan Teki return 0;
38*99ba4308SJagan Teki }
39*99ba4308SJagan Teki
sunxi_reset_free(struct reset_ctl * reset_ctl)40*99ba4308SJagan Teki static int sunxi_reset_free(struct reset_ctl *reset_ctl)
41*99ba4308SJagan Teki {
42*99ba4308SJagan Teki debug("%s: (RST#%ld)\n", __func__, reset_ctl->id);
43*99ba4308SJagan Teki
44*99ba4308SJagan Teki return 0;
45*99ba4308SJagan Teki }
46*99ba4308SJagan Teki
sunxi_set_reset(struct reset_ctl * reset_ctl,bool on)47*99ba4308SJagan Teki static int sunxi_set_reset(struct reset_ctl *reset_ctl, bool on)
48*99ba4308SJagan Teki {
49*99ba4308SJagan Teki struct sunxi_reset_priv *priv = dev_get_priv(reset_ctl->dev);
50*99ba4308SJagan Teki const struct ccu_reset *reset = priv_to_reset(priv, reset_ctl->id);
51*99ba4308SJagan Teki u32 reg;
52*99ba4308SJagan Teki
53*99ba4308SJagan Teki if (!(reset->flags & CCU_RST_F_IS_VALID)) {
54*99ba4308SJagan Teki printf("%s: (RST#%ld) unhandled\n", __func__, reset_ctl->id);
55*99ba4308SJagan Teki return 0;
56*99ba4308SJagan Teki }
57*99ba4308SJagan Teki
58*99ba4308SJagan Teki debug("%s: (RST#%ld) off#0x%x, BIT(%d)\n", __func__,
59*99ba4308SJagan Teki reset_ctl->id, reset->off, ilog2(reset->bit));
60*99ba4308SJagan Teki
61*99ba4308SJagan Teki reg = readl(priv->base + reset->off);
62*99ba4308SJagan Teki if (on)
63*99ba4308SJagan Teki reg |= reset->bit;
64*99ba4308SJagan Teki else
65*99ba4308SJagan Teki reg &= ~reset->bit;
66*99ba4308SJagan Teki
67*99ba4308SJagan Teki writel(reg, priv->base + reset->off);
68*99ba4308SJagan Teki
69*99ba4308SJagan Teki return 0;
70*99ba4308SJagan Teki }
71*99ba4308SJagan Teki
sunxi_reset_assert(struct reset_ctl * reset_ctl)72*99ba4308SJagan Teki static int sunxi_reset_assert(struct reset_ctl *reset_ctl)
73*99ba4308SJagan Teki {
74*99ba4308SJagan Teki return sunxi_set_reset(reset_ctl, false);
75*99ba4308SJagan Teki }
76*99ba4308SJagan Teki
sunxi_reset_deassert(struct reset_ctl * reset_ctl)77*99ba4308SJagan Teki static int sunxi_reset_deassert(struct reset_ctl *reset_ctl)
78*99ba4308SJagan Teki {
79*99ba4308SJagan Teki return sunxi_set_reset(reset_ctl, true);
80*99ba4308SJagan Teki }
81*99ba4308SJagan Teki
82*99ba4308SJagan Teki struct reset_ops sunxi_reset_ops = {
83*99ba4308SJagan Teki .request = sunxi_reset_request,
84*99ba4308SJagan Teki .free = sunxi_reset_free,
85*99ba4308SJagan Teki .rst_assert = sunxi_reset_assert,
86*99ba4308SJagan Teki .rst_deassert = sunxi_reset_deassert,
87*99ba4308SJagan Teki };
88*99ba4308SJagan Teki
sunxi_reset_probe(struct udevice * dev)89*99ba4308SJagan Teki static int sunxi_reset_probe(struct udevice *dev)
90*99ba4308SJagan Teki {
91*99ba4308SJagan Teki struct sunxi_reset_priv *priv = dev_get_priv(dev);
92*99ba4308SJagan Teki
93*99ba4308SJagan Teki priv->base = dev_read_addr_ptr(dev);
94*99ba4308SJagan Teki
95*99ba4308SJagan Teki return 0;
96*99ba4308SJagan Teki }
97*99ba4308SJagan Teki
sunxi_reset_bind(struct udevice * dev,ulong count)98*99ba4308SJagan Teki int sunxi_reset_bind(struct udevice *dev, ulong count)
99*99ba4308SJagan Teki {
100*99ba4308SJagan Teki struct udevice *rst_dev;
101*99ba4308SJagan Teki struct sunxi_reset_priv *priv;
102*99ba4308SJagan Teki int ret;
103*99ba4308SJagan Teki
104*99ba4308SJagan Teki ret = device_bind_driver_to_node(dev, "sunxi_reset", "reset",
105*99ba4308SJagan Teki dev_ofnode(dev), &rst_dev);
106*99ba4308SJagan Teki if (ret) {
107*99ba4308SJagan Teki debug("failed to bind sunxi_reset driver (ret=%d)\n", ret);
108*99ba4308SJagan Teki return ret;
109*99ba4308SJagan Teki }
110*99ba4308SJagan Teki priv = malloc(sizeof(struct sunxi_reset_priv));
111*99ba4308SJagan Teki priv->count = count;
112*99ba4308SJagan Teki priv->desc = (const struct ccu_desc *)dev_get_driver_data(dev);
113*99ba4308SJagan Teki rst_dev->priv = priv;
114*99ba4308SJagan Teki
115*99ba4308SJagan Teki return 0;
116*99ba4308SJagan Teki }
117*99ba4308SJagan Teki
118*99ba4308SJagan Teki U_BOOT_DRIVER(sunxi_reset) = {
119*99ba4308SJagan Teki .name = "sunxi_reset",
120*99ba4308SJagan Teki .id = UCLASS_RESET,
121*99ba4308SJagan Teki .ops = &sunxi_reset_ops,
122*99ba4308SJagan Teki .probe = sunxi_reset_probe,
123*99ba4308SJagan Teki .priv_auto_alloc_size = sizeof(struct sunxi_reset_priv),
124*99ba4308SJagan Teki };
125