1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2019 DENX Software Engineering
4 * Lukasz Majewski, DENX Software Engineering, lukma@denx.de
11 #include <clk-uclass.h>
12 #include <dm/device.h>
13 #include <dm/uclass.h>
17 #define UBOOT_DM_CLK_IMX_PLLV3_GENERIC "imx_clk_pllv3_generic"
18 #define UBOOT_DM_CLK_IMX_PLLV3_SYS "imx_clk_pllv3_sys"
19 #define UBOOT_DM_CLK_IMX_PLLV3_USB "imx_clk_pllv3_usb"
20 #define UBOOT_DM_CLK_IMX_PLLV3_AV "imx_clk_pllv3_av"
22 #define PLL_NUM_OFFSET 0x10
23 #define PLL_DENOM_OFFSET 0x20
25 #define BM_PLL_POWER (0x1 << 12)
26 #define BM_PLL_LOCK (0x1 << 31)
37 #define to_clk_pllv3(_clk) container_of(_clk, struct clk_pllv3, clk)
39 static ulong clk_pllv3_generic_get_rate(struct clk *clk)
41 struct clk_pllv3 *pll = to_clk_pllv3(dev_get_clk_ptr(clk->dev));
42 unsigned long parent_rate = clk_get_parent_rate(clk);
44 u32 div = (readl(pll->base) >> pll->div_shift) & pll->div_mask;
46 return (div == 1) ? parent_rate * 22 : parent_rate * 20;
49 static ulong clk_pllv3_generic_set_rate(struct clk *clk, ulong rate)
51 struct clk_pllv3 *pll = to_clk_pllv3(clk);
52 unsigned long parent_rate = clk_get_parent_rate(clk);
55 if (rate == parent_rate * 22)
57 else if (rate == parent_rate * 20)
62 val = readl(pll->base);
63 val &= ~(pll->div_mask << pll->div_shift);
64 val |= (div << pll->div_shift);
65 writel(val, pll->base);
67 /* Wait for PLL to lock */
68 while (!(readl(pll->base) & BM_PLL_LOCK))
74 static int clk_pllv3_generic_enable(struct clk *clk)
76 struct clk_pllv3 *pll = to_clk_pllv3(clk);
79 val = readl(pll->base);
81 val |= pll->power_bit;
83 val &= ~pll->power_bit;
84 writel(val, pll->base);
89 static int clk_pllv3_generic_disable(struct clk *clk)
91 struct clk_pllv3 *pll = to_clk_pllv3(clk);
94 val = readl(pll->base);
96 val &= ~pll->power_bit;
98 val |= pll->power_bit;
99 writel(val, pll->base);
104 static const struct clk_ops clk_pllv3_generic_ops = {
105 .get_rate = clk_pllv3_generic_get_rate,
106 .enable = clk_pllv3_generic_enable,
107 .disable = clk_pllv3_generic_disable,
108 .set_rate = clk_pllv3_generic_set_rate,
111 static ulong clk_pllv3_sys_get_rate(struct clk *clk)
113 struct clk_pllv3 *pll = to_clk_pllv3(clk);
114 unsigned long parent_rate = clk_get_parent_rate(clk);
115 u32 div = readl(pll->base) & pll->div_mask;
117 return parent_rate * div / 2;
120 static ulong clk_pllv3_sys_set_rate(struct clk *clk, ulong rate)
122 struct clk_pllv3 *pll = to_clk_pllv3(clk);
123 unsigned long parent_rate = clk_get_parent_rate(clk);
124 unsigned long min_rate;
125 unsigned long max_rate;
128 if (parent_rate == 0)
131 min_rate = parent_rate * 54 / 2;
132 max_rate = parent_rate * 108 / 2;
134 if (rate < min_rate || rate > max_rate)
137 div = rate * 2 / parent_rate;
138 val = readl(pll->base);
139 val &= ~pll->div_mask;
141 writel(val, pll->base);
143 /* Wait for PLL to lock */
144 while (!(readl(pll->base) & BM_PLL_LOCK))
150 static const struct clk_ops clk_pllv3_sys_ops = {
151 .enable = clk_pllv3_generic_enable,
152 .disable = clk_pllv3_generic_disable,
153 .get_rate = clk_pllv3_sys_get_rate,
154 .set_rate = clk_pllv3_sys_set_rate,
157 static ulong clk_pllv3_av_get_rate(struct clk *clk)
159 struct clk_pllv3 *pll = to_clk_pllv3(clk);
160 unsigned long parent_rate = clk_get_parent_rate(clk);
161 u32 mfn = readl(pll->base + PLL_NUM_OFFSET);
162 u32 mfd = readl(pll->base + PLL_DENOM_OFFSET);
163 u32 div = readl(pll->base) & pll->div_mask;
164 u64 temp64 = (u64)parent_rate;
172 return parent_rate * div + (unsigned long)temp64;
175 static ulong clk_pllv3_av_set_rate(struct clk *clk, ulong rate)
177 struct clk_pllv3 *pll = to_clk_pllv3(clk);
178 unsigned long parent_rate = clk_get_parent_rate(clk);
179 unsigned long min_rate = parent_rate * 27;
180 unsigned long max_rate = parent_rate * 54;
182 u32 mfn, mfd = 1000000;
183 u32 max_mfd = 0x3FFFFFFF;
186 if (rate < min_rate || rate > max_rate)
189 if (parent_rate <= max_mfd)
192 div = rate / parent_rate;
193 temp64 = (u64)(rate - div * parent_rate);
195 do_div(temp64, parent_rate);
198 val = readl(pll->base);
199 val &= ~pll->div_mask;
201 writel(val, pll->base);
202 writel(mfn, pll->base + PLL_NUM_OFFSET);
203 writel(mfd, pll->base + PLL_DENOM_OFFSET);
205 /* Wait for PLL to lock */
206 while (!(readl(pll->base) & BM_PLL_LOCK))
212 static const struct clk_ops clk_pllv3_av_ops = {
213 .enable = clk_pllv3_generic_enable,
214 .disable = clk_pllv3_generic_disable,
215 .get_rate = clk_pllv3_av_get_rate,
216 .set_rate = clk_pllv3_av_set_rate,
219 struct clk *imx_clk_pllv3(enum imx_pllv3_type type, const char *name,
220 const char *parent_name, void __iomem *base,
223 struct clk_pllv3 *pll;
228 pll = kzalloc(sizeof(*pll), GFP_KERNEL);
230 return ERR_PTR(-ENOMEM);
232 pll->power_bit = BM_PLL_POWER;
235 case IMX_PLLV3_GENERIC:
236 drv_name = UBOOT_DM_CLK_IMX_PLLV3_GENERIC;
238 pll->powerup_set = false;
241 drv_name = UBOOT_DM_CLK_IMX_PLLV3_SYS;
243 pll->powerup_set = false;
246 drv_name = UBOOT_DM_CLK_IMX_PLLV3_USB;
248 pll->powerup_set = true;
251 drv_name = UBOOT_DM_CLK_IMX_PLLV3_AV;
253 pll->powerup_set = false;
257 return ERR_PTR(-ENOTSUPP);
261 pll->div_mask = div_mask;
264 ret = clk_register(clk, drv_name, name, parent_name);
273 U_BOOT_DRIVER(clk_pllv3_generic) = {
274 .name = UBOOT_DM_CLK_IMX_PLLV3_GENERIC,
276 .ops = &clk_pllv3_generic_ops,
277 .flags = DM_FLAG_PRE_RELOC,
280 U_BOOT_DRIVER(clk_pllv3_sys) = {
281 .name = UBOOT_DM_CLK_IMX_PLLV3_SYS,
283 .ops = &clk_pllv3_sys_ops,
284 .flags = DM_FLAG_PRE_RELOC,
287 U_BOOT_DRIVER(clk_pllv3_usb) = {
288 .name = UBOOT_DM_CLK_IMX_PLLV3_USB,
290 .ops = &clk_pllv3_generic_ops,
291 .flags = DM_FLAG_PRE_RELOC,
294 U_BOOT_DRIVER(clk_pllv3_av) = {
295 .name = UBOOT_DM_CLK_IMX_PLLV3_AV,
297 .ops = &clk_pllv3_av_ops,
298 .flags = DM_FLAG_PRE_RELOC,