1
2#include <linux/kernel.h>
3#include <linux/clk.h>
4#include <linux/io.h>
5#include <linux/errno.h>
6#include <linux/delay.h>
7#include <linux/slab.h>
8#include <linux/err.h>
9
10#include <asm/div64.h>
11
12#include "clk.h"
13
14#define to_clk_pllv2(clk) (container_of(clk, struct clk_pllv2, clk))
15
16
17#define MXC_PLL_DP_CTL 0x00
18#define MXC_PLL_DP_CONFIG 0x04
19#define MXC_PLL_DP_OP 0x08
20#define MXC_PLL_DP_MFD 0x0C
21#define MXC_PLL_DP_MFN 0x10
22#define MXC_PLL_DP_MFNMINUS 0x14
23#define MXC_PLL_DP_MFNPLUS 0x18
24#define MXC_PLL_DP_HFS_OP 0x1C
25#define MXC_PLL_DP_HFS_MFD 0x20
26#define MXC_PLL_DP_HFS_MFN 0x24
27#define MXC_PLL_DP_MFN_TOGC 0x28
28#define MXC_PLL_DP_DESTAT 0x2c
29
30
31#define MXC_PLL_DP_CTL_MUL_CTRL 0x2000
32#define MXC_PLL_DP_CTL_DPDCK0_2_EN 0x1000
33#define MXC_PLL_DP_CTL_DPDCK0_2_OFFSET 12
34#define MXC_PLL_DP_CTL_ADE 0x800
35#define MXC_PLL_DP_CTL_REF_CLK_DIV 0x400
36#define MXC_PLL_DP_CTL_REF_CLK_SEL_MASK (3 << 8)
37#define MXC_PLL_DP_CTL_REF_CLK_SEL_OFFSET 8
38#define MXC_PLL_DP_CTL_HFSM 0x80
39#define MXC_PLL_DP_CTL_PRE 0x40
40#define MXC_PLL_DP_CTL_UPEN 0x20
41#define MXC_PLL_DP_CTL_RST 0x10
42#define MXC_PLL_DP_CTL_RCP 0x8
43#define MXC_PLL_DP_CTL_PLM 0x4
44#define MXC_PLL_DP_CTL_BRM0 0x2
45#define MXC_PLL_DP_CTL_LRF 0x1
46
47#define MXC_PLL_DP_CONFIG_BIST 0x8
48#define MXC_PLL_DP_CONFIG_SJC_CE 0x4
49#define MXC_PLL_DP_CONFIG_AREN 0x2
50#define MXC_PLL_DP_CONFIG_LDREQ 0x1
51
52#define MXC_PLL_DP_OP_MFI_OFFSET 4
53#define MXC_PLL_DP_OP_MFI_MASK (0xF << 4)
54#define MXC_PLL_DP_OP_PDF_OFFSET 0
55#define MXC_PLL_DP_OP_PDF_MASK 0xF
56
57#define MXC_PLL_DP_MFD_OFFSET 0
58#define MXC_PLL_DP_MFD_MASK 0x07FFFFFF
59
60#define MXC_PLL_DP_MFN_OFFSET 0x0
61#define MXC_PLL_DP_MFN_MASK 0x07FFFFFF
62
63#define MXC_PLL_DP_MFN_TOGC_TOG_DIS (1 << 17)
64#define MXC_PLL_DP_MFN_TOGC_TOG_EN (1 << 16)
65#define MXC_PLL_DP_MFN_TOGC_CNT_OFFSET 0x0
66#define MXC_PLL_DP_MFN_TOGC_CNT_MASK 0xFFFF
67
68#define MXC_PLL_DP_DESTAT_TOG_SEL (1 << 31)
69#define MXC_PLL_DP_DESTAT_MFN 0x07FFFFFF
70
71#define MAX_DPLL_WAIT_TRIES 1000
72
73struct clk_pllv2 {
74 struct clk_hw hw;
75 void __iomem *base;
76};
77
78static unsigned long __clk_pllv2_recalc_rate(unsigned long parent_rate,
79 u32 dp_ctl, u32 dp_op, u32 dp_mfd, u32 dp_mfn)
80{
81 long mfi, mfn, mfd, pdf, ref_clk;
82 unsigned long dbl;
83 u64 temp;
84
85 dbl = dp_ctl & MXC_PLL_DP_CTL_DPDCK0_2_EN;
86
87 pdf = dp_op & MXC_PLL_DP_OP_PDF_MASK;
88 mfi = (dp_op & MXC_PLL_DP_OP_MFI_MASK) >> MXC_PLL_DP_OP_MFI_OFFSET;
89 mfi = (mfi <= 5) ? 5 : mfi;
90 mfd = dp_mfd & MXC_PLL_DP_MFD_MASK;
91 mfn = dp_mfn & MXC_PLL_DP_MFN_MASK;
92 mfn = sign_extend32(mfn, 26);
93
94 ref_clk = 2 * parent_rate;
95 if (dbl != 0)
96 ref_clk *= 2;
97
98 ref_clk /= (pdf + 1);
99 temp = (u64) ref_clk * abs(mfn);
100 do_div(temp, mfd + 1);
101 if (mfn < 0)
102 temp = (ref_clk * mfi) - temp;
103 else
104 temp = (ref_clk * mfi) + temp;
105
106 return temp;
107}
108
109static unsigned long clk_pllv2_recalc_rate(struct clk_hw *hw,
110 unsigned long parent_rate)
111{
112 u32 dp_op, dp_mfd, dp_mfn, dp_ctl;
113 void __iomem *pllbase;
114 struct clk_pllv2 *pll = to_clk_pllv2(hw);
115
116 pllbase = pll->base;
117
118 dp_ctl = __raw_readl(pllbase + MXC_PLL_DP_CTL);
119 dp_op = __raw_readl(pllbase + MXC_PLL_DP_OP);
120 dp_mfd = __raw_readl(pllbase + MXC_PLL_DP_MFD);
121 dp_mfn = __raw_readl(pllbase + MXC_PLL_DP_MFN);
122
123 return __clk_pllv2_recalc_rate(parent_rate, dp_ctl, dp_op, dp_mfd, dp_mfn);
124}
125
126static int __clk_pllv2_set_rate(unsigned long rate, unsigned long parent_rate,
127 u32 *dp_op, u32 *dp_mfd, u32 *dp_mfn)
128{
129 u32 reg;
130 long mfi, pdf, mfn, mfd = 999999;
131 u64 temp64;
132 unsigned long quad_parent_rate;
133
134 quad_parent_rate = 4 * parent_rate;
135 pdf = mfi = -1;
136 while (++pdf < 16 && mfi < 5)
137 mfi = rate * (pdf+1) / quad_parent_rate;
138 if (mfi > 15)
139 return -EINVAL;
140 pdf--;
141
142 temp64 = rate * (pdf + 1) - quad_parent_rate * mfi;
143 do_div(temp64, quad_parent_rate / 1000000);
144 mfn = (long)temp64;
145
146 reg = mfi << 4 | pdf;
147
148 *dp_op = reg;
149 *dp_mfd = mfd;
150 *dp_mfn = mfn;
151
152 return 0;
153}
154
155static int clk_pllv2_set_rate(struct clk_hw *hw, unsigned long rate,
156 unsigned long parent_rate)
157{
158 struct clk_pllv2 *pll = to_clk_pllv2(hw);
159 void __iomem *pllbase;
160 u32 dp_ctl, dp_op, dp_mfd, dp_mfn;
161 int ret;
162
163 pllbase = pll->base;
164
165
166 ret = __clk_pllv2_set_rate(rate, parent_rate, &dp_op, &dp_mfd, &dp_mfn);
167 if (ret)
168 return ret;
169
170 dp_ctl = __raw_readl(pllbase + MXC_PLL_DP_CTL);
171
172 __raw_writel(dp_ctl | 0x1000L, pllbase + MXC_PLL_DP_CTL);
173
174 __raw_writel(dp_op, pllbase + MXC_PLL_DP_OP);
175 __raw_writel(dp_mfd, pllbase + MXC_PLL_DP_MFD);
176 __raw_writel(dp_mfn, pllbase + MXC_PLL_DP_MFN);
177
178 return 0;
179}
180
181static long clk_pllv2_round_rate(struct clk_hw *hw, unsigned long rate,
182 unsigned long *prate)
183{
184 u32 dp_op, dp_mfd, dp_mfn;
185 int ret;
186
187 ret = __clk_pllv2_set_rate(rate, *prate, &dp_op, &dp_mfd, &dp_mfn);
188 if (ret)
189 return ret;
190
191 return __clk_pllv2_recalc_rate(*prate, MXC_PLL_DP_CTL_DPDCK0_2_EN,
192 dp_op, dp_mfd, dp_mfn);
193}
194
195static int clk_pllv2_prepare(struct clk_hw *hw)
196{
197 struct clk_pllv2 *pll = to_clk_pllv2(hw);
198 u32 reg;
199 void __iomem *pllbase;
200 int i = 0;
201
202 pllbase = pll->base;
203 reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) | MXC_PLL_DP_CTL_UPEN;
204 __raw_writel(reg, pllbase + MXC_PLL_DP_CTL);
205
206
207 do {
208 reg = __raw_readl(pllbase + MXC_PLL_DP_CTL);
209 if (reg & MXC_PLL_DP_CTL_LRF)
210 break;
211
212 udelay(1);
213 } while (++i < MAX_DPLL_WAIT_TRIES);
214
215 if (i == MAX_DPLL_WAIT_TRIES) {
216 pr_err("MX5: pll locking failed\n");
217 return -EINVAL;
218 }
219
220 return 0;
221}
222
223static void clk_pllv2_unprepare(struct clk_hw *hw)
224{
225 struct clk_pllv2 *pll = to_clk_pllv2(hw);
226 u32 reg;
227 void __iomem *pllbase;
228
229 pllbase = pll->base;
230 reg = __raw_readl(pllbase + MXC_PLL_DP_CTL) & ~MXC_PLL_DP_CTL_UPEN;
231 __raw_writel(reg, pllbase + MXC_PLL_DP_CTL);
232}
233
234static const struct clk_ops clk_pllv2_ops = {
235 .prepare = clk_pllv2_prepare,
236 .unprepare = clk_pllv2_unprepare,
237 .recalc_rate = clk_pllv2_recalc_rate,
238 .round_rate = clk_pllv2_round_rate,
239 .set_rate = clk_pllv2_set_rate,
240};
241
242struct clk *imx_clk_pllv2(const char *name, const char *parent,
243 void __iomem *base)
244{
245 struct clk_pllv2 *pll;
246 struct clk *clk;
247 struct clk_init_data init;
248
249 pll = kzalloc(sizeof(*pll), GFP_KERNEL);
250 if (!pll)
251 return ERR_PTR(-ENOMEM);
252
253 pll->base = base;
254
255 init.name = name;
256 init.ops = &clk_pllv2_ops;
257 init.flags = 0;
258 init.parent_names = &parent;
259 init.num_parents = 1;
260
261 pll->hw.init = &init;
262
263 clk = clk_register(NULL, &pll->hw);
264 if (IS_ERR(clk))
265 kfree(pll);
266
267 return clk;
268}
269
