1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 * Copyright 2013-2015 Emilio López
  4 *
  5 * Emilio López <emilio@elopez.com.ar>
  6 */
  7
  8#include <linux/clk.h>
  9#include <linux/clk-provider.h>
 10#include <linux/io.h>
 11#include <linux/of.h>
 12#include <linux/of_address.h>
 13#include <linux/reset-controller.h>
 14#include <linux/slab.h>
 15#include <linux/spinlock.h>
 16
 17
 18/**
 19 * sunxi_usb_reset... - reset bits in usb clk registers handling
 20 */
 21
 22struct usb_reset_data {
 23	void __iomem			*reg;
 24	spinlock_t			*lock;
 25	struct clk			*clk;
 26	struct reset_controller_dev	rcdev;
 27};
 28
 29static int sunxi_usb_reset_assert(struct reset_controller_dev *rcdev,
 30			      unsigned long id)
 31{
 32	struct usb_reset_data *data = container_of(rcdev,
 33						   struct usb_reset_data,
 34						   rcdev);
 35	unsigned long flags;
 36	u32 reg;
 37
 38	clk_prepare_enable(data->clk);
 39	spin_lock_irqsave(data->lock, flags);
 40
 41	reg = readl(data->reg);
 42	writel(reg & ~BIT(id), data->reg);
 43
 44	spin_unlock_irqrestore(data->lock, flags);
 45	clk_disable_unprepare(data->clk);
 46
 47	return 0;
 48}
 49
 50static int sunxi_usb_reset_deassert(struct reset_controller_dev *rcdev,
 51				unsigned long id)
 52{
 53	struct usb_reset_data *data = container_of(rcdev,
 54						     struct usb_reset_data,
 55						     rcdev);
 56	unsigned long flags;
 57	u32 reg;
 58
 59	clk_prepare_enable(data->clk);
 60	spin_lock_irqsave(data->lock, flags);
 61
 62	reg = readl(data->reg);
 63	writel(reg | BIT(id), data->reg);
 64
 65	spin_unlock_irqrestore(data->lock, flags);
 66	clk_disable_unprepare(data->clk);
 67
 68	return 0;
 69}
 70
 71static const struct reset_control_ops sunxi_usb_reset_ops = {
 72	.assert		= sunxi_usb_reset_assert,
 73	.deassert	= sunxi_usb_reset_deassert,
 74};
 75
 76/**
 77 * sunxi_usb_clk_setup() - Setup function for usb gate clocks
 78 */
 79
 80#define SUNXI_USB_MAX_SIZE 32
 81
 82struct usb_clk_data {
 83	u32 clk_mask;
 84	u32 reset_mask;
 85	bool reset_needs_clk;
 86};
 87
 88static void __init sunxi_usb_clk_setup(struct device_node *node,
 89				       const struct usb_clk_data *data,
 90				       spinlock_t *lock)
 91{
 92	struct clk_onecell_data *clk_data;
 93	struct usb_reset_data *reset_data;
 94	const char *clk_parent;
 95	const char *clk_name;
 96	void __iomem *reg;
 97	int qty;
 98	int i = 0;
 99	int j = 0;
100
101	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
102	if (IS_ERR(reg))
103		return;
104
105	clk_parent = of_clk_get_parent_name(node, 0);
106	if (!clk_parent)
107		return;
108
109	/* Worst-case size approximation and memory allocation */
110	qty = find_last_bit((unsigned long *)&data->clk_mask,
111			    SUNXI_USB_MAX_SIZE);
112
113	clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
114	if (!clk_data)
115		return;
116
117	clk_data->clks = kcalloc(qty + 1, sizeof(struct clk *), GFP_KERNEL);
118	if (!clk_data->clks) {
119		kfree(clk_data);
120		return;
121	}
122
123	for_each_set_bit(i, (unsigned long *)&data->clk_mask,
124			 SUNXI_USB_MAX_SIZE) {
125		of_property_read_string_index(node, "clock-output-names",
126					      j, &clk_name);
127		clk_data->clks[i] = clk_register_gate(NULL, clk_name,
128						      clk_parent, 0,
129						      reg, i, 0, lock);
130		WARN_ON(IS_ERR(clk_data->clks[i]));
131
132		j++;
133	}
134
135	/* Adjust to the real max */
136	clk_data->clk_num = i;
137
138	of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
139
140	/* Register a reset controller for usb with reset bits */
141	if (data->reset_mask == 0)
142		return;
143
144	reset_data = kzalloc(sizeof(*reset_data), GFP_KERNEL);
145	if (!reset_data)
146		return;
147
148	if (data->reset_needs_clk) {
149		reset_data->clk = of_clk_get(node, 0);
150		if (IS_ERR(reset_data->clk)) {
151			pr_err("Could not get clock for reset controls\n");
152			kfree(reset_data);
153			return;
154		}
155	}
156
157	reset_data->reg = reg;
158	reset_data->lock = lock;
159	reset_data->rcdev.nr_resets = __fls(data->reset_mask) + 1;
160	reset_data->rcdev.ops = &sunxi_usb_reset_ops;
161	reset_data->rcdev.of_node = node;
162	reset_controller_register(&reset_data->rcdev);
163}
164
165static const struct usb_clk_data sun4i_a10_usb_clk_data __initconst = {
166	.clk_mask = BIT(8) | BIT(7) | BIT(6),
167	.reset_mask = BIT(2) | BIT(1) | BIT(0),
168};
169
170static DEFINE_SPINLOCK(sun4i_a10_usb_lock);
171
172static void __init sun4i_a10_usb_setup(struct device_node *node)
173{
174	sunxi_usb_clk_setup(node, &sun4i_a10_usb_clk_data, &sun4i_a10_usb_lock);
175}
176CLK_OF_DECLARE(sun4i_a10_usb, "allwinner,sun4i-a10-usb-clk", sun4i_a10_usb_setup);
177
178static const struct usb_clk_data sun5i_a13_usb_clk_data __initconst = {
179	.clk_mask = BIT(8) | BIT(6),
180	.reset_mask = BIT(1) | BIT(0),
181};
182
183static void __init sun5i_a13_usb_setup(struct device_node *node)
184{
185	sunxi_usb_clk_setup(node, &sun5i_a13_usb_clk_data, &sun4i_a10_usb_lock);
186}
187CLK_OF_DECLARE(sun5i_a13_usb, "allwinner,sun5i-a13-usb-clk", sun5i_a13_usb_setup);
188
189static const struct usb_clk_data sun6i_a31_usb_clk_data __initconst = {
190	.clk_mask = BIT(18) | BIT(17) | BIT(16) | BIT(10) | BIT(9) | BIT(8),
191	.reset_mask = BIT(2) | BIT(1) | BIT(0),
192};
193
194static void __init sun6i_a31_usb_setup(struct device_node *node)
195{
196	sunxi_usb_clk_setup(node, &sun6i_a31_usb_clk_data, &sun4i_a10_usb_lock);
197}
198CLK_OF_DECLARE(sun6i_a31_usb, "allwinner,sun6i-a31-usb-clk", sun6i_a31_usb_setup);
199
200static const struct usb_clk_data sun8i_a23_usb_clk_data __initconst = {
201	.clk_mask = BIT(16) | BIT(11) | BIT(10) | BIT(9) | BIT(8),
202	.reset_mask = BIT(2) | BIT(1) | BIT(0),
203};
204
205static void __init sun8i_a23_usb_setup(struct device_node *node)
206{
207	sunxi_usb_clk_setup(node, &sun8i_a23_usb_clk_data, &sun4i_a10_usb_lock);
208}
209CLK_OF_DECLARE(sun8i_a23_usb, "allwinner,sun8i-a23-usb-clk", sun8i_a23_usb_setup);
210
211static const struct usb_clk_data sun8i_h3_usb_clk_data __initconst = {
212	.clk_mask =  BIT(19) | BIT(18) | BIT(17) | BIT(16) |
213		     BIT(11) | BIT(10) | BIT(9) | BIT(8),
214	.reset_mask = BIT(3) | BIT(2) | BIT(1) | BIT(0),
215};
216
217static void __init sun8i_h3_usb_setup(struct device_node *node)
218{
219	sunxi_usb_clk_setup(node, &sun8i_h3_usb_clk_data, &sun4i_a10_usb_lock);
220}
221CLK_OF_DECLARE(sun8i_h3_usb, "allwinner,sun8i-h3-usb-clk", sun8i_h3_usb_setup);
222
223static const struct usb_clk_data sun9i_a80_usb_mod_data __initconst = {
224	.clk_mask = BIT(6) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
225	.reset_mask = BIT(19) | BIT(18) | BIT(17),
226	.reset_needs_clk = 1,
227};
228
229static DEFINE_SPINLOCK(a80_usb_mod_lock);
230
231static void __init sun9i_a80_usb_mod_setup(struct device_node *node)
232{
233	sunxi_usb_clk_setup(node, &sun9i_a80_usb_mod_data, &a80_usb_mod_lock);
234}
235CLK_OF_DECLARE(sun9i_a80_usb_mod, "allwinner,sun9i-a80-usb-mod-clk", sun9i_a80_usb_mod_setup);
236
237static const struct usb_clk_data sun9i_a80_usb_phy_data __initconst = {
238	.clk_mask = BIT(10) | BIT(5) | BIT(4) | BIT(3) | BIT(2) | BIT(1),
239	.reset_mask = BIT(21) | BIT(20) | BIT(19) | BIT(18) | BIT(17),
240	.reset_needs_clk = 1,
241};
242
243static DEFINE_SPINLOCK(a80_usb_phy_lock);
244
245static void __init sun9i_a80_usb_phy_setup(struct device_node *node)
246{
247	sunxi_usb_clk_setup(node, &sun9i_a80_usb_phy_data, &a80_usb_phy_lock);
248}
249CLK_OF_DECLARE(sun9i_a80_usb_phy, "allwinner,sun9i-a80-usb-phy-clk", sun9i_a80_usb_phy_setup);