1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2016 Freescale Semiconductor, Inc.
4 * Copyright 2017~2018 NXP
6 * Author: Dong Aisheng <aisheng.dong@nxp.com>
10 #include <linux/clk-provider.h>
11 #include <linux/err.h>
12 #include <linux/iopoll.h>
13 #include <linux/slab.h>
17 /* PLL Control Status Register (xPLLCSR) */
18 #define PLL_CSR_OFFSET 0x0
19 #define PLL_VLD BIT(24)
22 /* PLL Configuration Register (xPLLCFG) */
23 #define PLL_CFG_OFFSET 0x08
24 #define BP_PLL_MULT 16
25 #define BM_PLL_MULT (0x7f << 16)
27 /* PLL Numerator Register (xPLLNUM) */
28 #define PLL_NUM_OFFSET 0x10
30 /* PLL Denominator Register (xPLLDENOM) */
31 #define PLL_DENOM_OFFSET 0x14
38 /* Valid PLL MULT Table */
39 static const int pllv4_mult_table[] = {33, 27, 22, 20, 17, 16};
41 #define to_clk_pllv4(__hw) container_of(__hw, struct clk_pllv4, hw)
43 #define LOCK_TIMEOUT_US USEC_PER_MSEC
45 static inline int clk_pllv4_wait_lock(struct clk_pllv4 *pll)
49 return readl_poll_timeout(pll->base + PLL_CSR_OFFSET,
50 csr, csr & PLL_VLD, 0, LOCK_TIMEOUT_US);
53 static int clk_pllv4_is_enabled(struct clk_hw *hw)
55 struct clk_pllv4 *pll = to_clk_pllv4(hw);
57 if (readl_relaxed(pll->base) & PLL_EN)
63 static unsigned long clk_pllv4_recalc_rate(struct clk_hw *hw,
64 unsigned long parent_rate)
66 struct clk_pllv4 *pll = to_clk_pllv4(hw);
69 div = readl_relaxed(pll->base + PLL_CFG_OFFSET);
73 return parent_rate * div;
76 static long clk_pllv4_round_rate(struct clk_hw *hw, unsigned long rate,
79 unsigned long parent_rate = *prate;
80 unsigned long round_rate, i;
82 for (i = 0; i < ARRAY_SIZE(pllv4_mult_table); i++) {
83 round_rate = parent_rate * pllv4_mult_table[i];
84 if (rate >= round_rate)
91 static bool clk_pllv4_is_valid_mult(unsigned int mult)
95 /* check if mult is in valid MULT table */
96 for (i = 0; i < ARRAY_SIZE(pllv4_mult_table); i++) {
97 if (pllv4_mult_table[i] == mult)
104 static int clk_pllv4_set_rate(struct clk_hw *hw, unsigned long rate,
105 unsigned long parent_rate)
107 struct clk_pllv4 *pll = to_clk_pllv4(hw);
110 mult = rate / parent_rate;
112 if (!clk_pllv4_is_valid_mult(mult))
115 val = readl_relaxed(pll->base + PLL_CFG_OFFSET);
117 val |= mult << BP_PLL_MULT;
118 writel_relaxed(val, pll->base + PLL_CFG_OFFSET);
123 static int clk_pllv4_enable(struct clk_hw *hw)
126 struct clk_pllv4 *pll = to_clk_pllv4(hw);
128 val = readl_relaxed(pll->base);
130 writel_relaxed(val, pll->base);
132 return clk_pllv4_wait_lock(pll);
135 static void clk_pllv4_disable(struct clk_hw *hw)
138 struct clk_pllv4 *pll = to_clk_pllv4(hw);
140 val = readl_relaxed(pll->base);
142 writel_relaxed(val, pll->base);
145 static const struct clk_ops clk_pllv4_ops = {
146 .recalc_rate = clk_pllv4_recalc_rate,
147 .round_rate = clk_pllv4_round_rate,
148 .set_rate = clk_pllv4_set_rate,
149 .enable = clk_pllv4_enable,
150 .disable = clk_pllv4_disable,
151 .is_enabled = clk_pllv4_is_enabled,
154 struct clk_hw *imx_clk_pllv4(const char *name, const char *parent_name,
157 struct clk_pllv4 *pll;
159 struct clk_init_data init;
162 pll = kzalloc(sizeof(*pll), GFP_KERNEL);
164 return ERR_PTR(-ENOMEM);
169 init.ops = &clk_pllv4_ops;
170 init.parent_names = &parent_name;
171 init.num_parents = 1;
172 init.flags = CLK_SET_RATE_GATE;
174 pll->hw.init = &init;
177 ret = clk_hw_register(NULL, hw);