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19#include <linux/clk-provider.h>
20#include <linux/err.h>
21#include <linux/io.h>
22#include <linux/slab.h>
23#include <linux/spinlock.h>
24#include <linux/of.h>
25#include <linux/of_address.h>
26
27#define STM32F4_RCC_PLLCFGR 0x04
28#define STM32F4_RCC_CFGR 0x08
29#define STM32F4_RCC_AHB1ENR 0x30
30#define STM32F4_RCC_AHB2ENR 0x34
31#define STM32F4_RCC_AHB3ENR 0x38
32#define STM32F4_RCC_APB1ENR 0x40
33#define STM32F4_RCC_APB2ENR 0x44
34
35struct stm32f4_gate_data {
36 u8 offset;
37 u8 bit_idx;
38 const char *name;
39 const char *parent_name;
40 unsigned long flags;
41};
42
43static const struct stm32f4_gate_data stm32f4_gates[] __initconst = {
44 { STM32F4_RCC_AHB1ENR, 0, "gpioa", "ahb_div" },
45 { STM32F4_RCC_AHB1ENR, 1, "gpiob", "ahb_div" },
46 { STM32F4_RCC_AHB1ENR, 2, "gpioc", "ahb_div" },
47 { STM32F4_RCC_AHB1ENR, 3, "gpiod", "ahb_div" },
48 { STM32F4_RCC_AHB1ENR, 4, "gpioe", "ahb_div" },
49 { STM32F4_RCC_AHB1ENR, 5, "gpiof", "ahb_div" },
50 { STM32F4_RCC_AHB1ENR, 6, "gpiog", "ahb_div" },
51 { STM32F4_RCC_AHB1ENR, 7, "gpioh", "ahb_div" },
52 { STM32F4_RCC_AHB1ENR, 8, "gpioi", "ahb_div" },
53 { STM32F4_RCC_AHB1ENR, 9, "gpioj", "ahb_div" },
54 { STM32F4_RCC_AHB1ENR, 10, "gpiok", "ahb_div" },
55 { STM32F4_RCC_AHB1ENR, 12, "crc", "ahb_div" },
56 { STM32F4_RCC_AHB1ENR, 18, "bkpsra", "ahb_div" },
57 { STM32F4_RCC_AHB1ENR, 20, "ccmdatam", "ahb_div" },
58 { STM32F4_RCC_AHB1ENR, 21, "dma1", "ahb_div" },
59 { STM32F4_RCC_AHB1ENR, 22, "dma2", "ahb_div" },
60 { STM32F4_RCC_AHB1ENR, 23, "dma2d", "ahb_div" },
61 { STM32F4_RCC_AHB1ENR, 25, "ethmac", "ahb_div" },
62 { STM32F4_RCC_AHB1ENR, 26, "ethmactx", "ahb_div" },
63 { STM32F4_RCC_AHB1ENR, 27, "ethmacrx", "ahb_div" },
64 { STM32F4_RCC_AHB1ENR, 28, "ethmacptp", "ahb_div" },
65 { STM32F4_RCC_AHB1ENR, 29, "otghs", "ahb_div" },
66 { STM32F4_RCC_AHB1ENR, 30, "otghsulpi", "ahb_div" },
67
68 { STM32F4_RCC_AHB2ENR, 0, "dcmi", "ahb_div" },
69 { STM32F4_RCC_AHB2ENR, 4, "cryp", "ahb_div" },
70 { STM32F4_RCC_AHB2ENR, 5, "hash", "ahb_div" },
71 { STM32F4_RCC_AHB2ENR, 6, "rng", "pll48" },
72 { STM32F4_RCC_AHB2ENR, 7, "otgfs", "pll48" },
73
74 { STM32F4_RCC_AHB3ENR, 0, "fmc", "ahb_div",
75 CLK_IGNORE_UNUSED },
76
77 { STM32F4_RCC_APB1ENR, 0, "tim2", "apb1_mul" },
78 { STM32F4_RCC_APB1ENR, 1, "tim3", "apb1_mul" },
79 { STM32F4_RCC_APB1ENR, 2, "tim4", "apb1_mul" },
80 { STM32F4_RCC_APB1ENR, 3, "tim5", "apb1_mul" },
81 { STM32F4_RCC_APB1ENR, 4, "tim6", "apb1_mul" },
82 { STM32F4_RCC_APB1ENR, 5, "tim7", "apb1_mul" },
83 { STM32F4_RCC_APB1ENR, 6, "tim12", "apb1_mul" },
84 { STM32F4_RCC_APB1ENR, 7, "tim13", "apb1_mul" },
85 { STM32F4_RCC_APB1ENR, 8, "tim14", "apb1_mul" },
86 { STM32F4_RCC_APB1ENR, 11, "wwdg", "apb1_div" },
87 { STM32F4_RCC_APB1ENR, 14, "spi2", "apb1_div" },
88 { STM32F4_RCC_APB1ENR, 15, "spi3", "apb1_div" },
89 { STM32F4_RCC_APB1ENR, 17, "uart2", "apb1_div" },
90 { STM32F4_RCC_APB1ENR, 18, "uart3", "apb1_div" },
91 { STM32F4_RCC_APB1ENR, 19, "uart4", "apb1_div" },
92 { STM32F4_RCC_APB1ENR, 20, "uart5", "apb1_div" },
93 { STM32F4_RCC_APB1ENR, 21, "i2c1", "apb1_div" },
94 { STM32F4_RCC_APB1ENR, 22, "i2c2", "apb1_div" },
95 { STM32F4_RCC_APB1ENR, 23, "i2c3", "apb1_div" },
96 { STM32F4_RCC_APB1ENR, 25, "can1", "apb1_div" },
97 { STM32F4_RCC_APB1ENR, 26, "can2", "apb1_div" },
98 { STM32F4_RCC_APB1ENR, 28, "pwr", "apb1_div" },
99 { STM32F4_RCC_APB1ENR, 29, "dac", "apb1_div" },
100 { STM32F4_RCC_APB1ENR, 30, "uart7", "apb1_div" },
101 { STM32F4_RCC_APB1ENR, 31, "uart8", "apb1_div" },
102
103 { STM32F4_RCC_APB2ENR, 0, "tim1", "apb2_mul" },
104 { STM32F4_RCC_APB2ENR, 1, "tim8", "apb2_mul" },
105 { STM32F4_RCC_APB2ENR, 4, "usart1", "apb2_div" },
106 { STM32F4_RCC_APB2ENR, 5, "usart6", "apb2_div" },
107 { STM32F4_RCC_APB2ENR, 8, "adc1", "apb2_div" },
108 { STM32F4_RCC_APB2ENR, 9, "adc2", "apb2_div" },
109 { STM32F4_RCC_APB2ENR, 10, "adc3", "apb2_div" },
110 { STM32F4_RCC_APB2ENR, 11, "sdio", "pll48" },
111 { STM32F4_RCC_APB2ENR, 12, "spi1", "apb2_div" },
112 { STM32F4_RCC_APB2ENR, 13, "spi4", "apb2_div" },
113 { STM32F4_RCC_APB2ENR, 14, "syscfg", "apb2_div" },
114 { STM32F4_RCC_APB2ENR, 16, "tim9", "apb2_mul" },
115 { STM32F4_RCC_APB2ENR, 17, "tim10", "apb2_mul" },
116 { STM32F4_RCC_APB2ENR, 18, "tim11", "apb2_mul" },
117 { STM32F4_RCC_APB2ENR, 20, "spi5", "apb2_div" },
118 { STM32F4_RCC_APB2ENR, 21, "spi6", "apb2_div" },
119 { STM32F4_RCC_APB2ENR, 22, "sai1", "apb2_div" },
120 { STM32F4_RCC_APB2ENR, 26, "ltdc", "apb2_div" },
121};
122
123
124
125
126
127#define MAX_CLKS 74
128
129enum { SYSTICK, FCLK };
130
131
132
133
134
135static const u64 stm32f42xx_gate_map[] = { 0x000000f17ef417ffull,
136 0x0000000000000001ull,
137 0x04777f33f6fec9ffull };
138
139static struct clk *clks[MAX_CLKS];
140static DEFINE_SPINLOCK(stm32f4_clk_lock);
141static void __iomem *base;
142
143
144
145
146
147
148
149
150
151struct clk_apb_mul {
152 struct clk_hw hw;
153 u8 bit_idx;
154};
155
156#define to_clk_apb_mul(_hw) container_of(_hw, struct clk_apb_mul, hw)
157
158static unsigned long clk_apb_mul_recalc_rate(struct clk_hw *hw,
159 unsigned long parent_rate)
160{
161 struct clk_apb_mul *am = to_clk_apb_mul(hw);
162
163 if (readl(base + STM32F4_RCC_CFGR) & BIT(am->bit_idx))
164 return parent_rate * 2;
165
166 return parent_rate;
167}
168
169static long clk_apb_mul_round_rate(struct clk_hw *hw, unsigned long rate,
170 unsigned long *prate)
171{
172 struct clk_apb_mul *am = to_clk_apb_mul(hw);
173 unsigned long mult = 1;
174
175 if (readl(base + STM32F4_RCC_CFGR) & BIT(am->bit_idx))
176 mult = 2;
177
178 if (__clk_get_flags(hw->clk) & CLK_SET_RATE_PARENT) {
179 unsigned long best_parent = rate / mult;
180
181 *prate =
182 __clk_round_rate(__clk_get_parent(hw->clk), best_parent);
183 }
184
185 return *prate * mult;
186}
187
188static int clk_apb_mul_set_rate(struct clk_hw *hw, unsigned long rate,
189 unsigned long parent_rate)
190{
191
192
193
194
195
196
197 return 0;
198}
199
200static const struct clk_ops clk_apb_mul_factor_ops = {
201 .round_rate = clk_apb_mul_round_rate,
202 .set_rate = clk_apb_mul_set_rate,
203 .recalc_rate = clk_apb_mul_recalc_rate,
204};
205
206static struct clk *clk_register_apb_mul(struct device *dev, const char *name,
207 const char *parent_name,
208 unsigned long flags, u8 bit_idx)
209{
210 struct clk_apb_mul *am;
211 struct clk_init_data init;
212 struct clk *clk;
213
214 am = kzalloc(sizeof(*am), GFP_KERNEL);
215 if (!am)
216 return ERR_PTR(-ENOMEM);
217
218 am->bit_idx = bit_idx;
219 am->hw.init = &init;
220
221 init.name = name;
222 init.ops = &clk_apb_mul_factor_ops;
223 init.flags = flags;
224 init.parent_names = &parent_name;
225 init.num_parents = 1;
226
227 clk = clk_register(dev, &am->hw);
228
229 if (IS_ERR(clk))
230 kfree(am);
231
232 return clk;
233}
234
235
236
237
238
239static void stm32f4_rcc_register_pll(const char *hse_clk, const char *hsi_clk)
240{
241 unsigned long pllcfgr = readl(base + STM32F4_RCC_PLLCFGR);
242
243 unsigned long pllm = pllcfgr & 0x3f;
244 unsigned long plln = (pllcfgr >> 6) & 0x1ff;
245 unsigned long pllp = BIT(((pllcfgr >> 16) & 3) + 1);
246 const char *pllsrc = pllcfgr & BIT(22) ? hse_clk : hsi_clk;
247 unsigned long pllq = (pllcfgr >> 24) & 0xf;
248
249 clk_register_fixed_factor(NULL, "vco", pllsrc, 0, plln, pllm);
250 clk_register_fixed_factor(NULL, "pll", "vco", 0, 1, pllp);
251 clk_register_fixed_factor(NULL, "pll48", "vco", 0, 1, pllq);
252}
253
254
255
256
257
258static int stm32f4_rcc_lookup_clk_idx(u8 primary, u8 secondary)
259{
260 u64 table[ARRAY_SIZE(stm32f42xx_gate_map)];
261
262 if (primary == 1) {
263 if (WARN_ON(secondary > FCLK))
264 return -EINVAL;
265 return secondary;
266 }
267
268 memcpy(table, stm32f42xx_gate_map, sizeof(table));
269
270
271 if (WARN_ON(secondary >= BITS_PER_BYTE * sizeof(table) ||
272 0 == (table[BIT_ULL_WORD(secondary)] &
273 BIT_ULL_MASK(secondary))))
274 return -EINVAL;
275
276
277 table[BIT_ULL_WORD(secondary)] &=
278 GENMASK_ULL(secondary % BITS_PER_LONG_LONG, 0);
279
280 return FCLK + hweight64(table[0]) +
281 (BIT_ULL_WORD(secondary) >= 1 ? hweight64(table[1]) : 0) +
282 (BIT_ULL_WORD(secondary) >= 2 ? hweight64(table[2]) : 0);
283}
284
285static struct clk *
286stm32f4_rcc_lookup_clk(struct of_phandle_args *clkspec, void *data)
287{
288 int i = stm32f4_rcc_lookup_clk_idx(clkspec->args[0], clkspec->args[1]);
289
290 if (i < 0)
291 return ERR_PTR(-EINVAL);
292
293 return clks[i];
294}
295
296static const char *sys_parents[] __initdata = { "hsi", NULL, "pll" };
297
298static const struct clk_div_table ahb_div_table[] = {
299 { 0x0, 1 }, { 0x1, 1 }, { 0x2, 1 }, { 0x3, 1 },
300 { 0x4, 1 }, { 0x5, 1 }, { 0x6, 1 }, { 0x7, 1 },
301 { 0x8, 2 }, { 0x9, 4 }, { 0xa, 8 }, { 0xb, 16 },
302 { 0xc, 64 }, { 0xd, 128 }, { 0xe, 256 }, { 0xf, 512 },
303 { 0 },
304};
305
306static const struct clk_div_table apb_div_table[] = {
307 { 0, 1 }, { 0, 1 }, { 0, 1 }, { 0, 1 },
308 { 4, 2 }, { 5, 4 }, { 6, 8 }, { 7, 16 },
309 { 0 },
310};
311
312static void __init stm32f4_rcc_init(struct device_node *np)
313{
314 const char *hse_clk;
315 int n;
316
317 base = of_iomap(np, 0);
318 if (!base) {
319 pr_err("%s: unable to map resource", np->name);
320 return;
321 }
322
323 hse_clk = of_clk_get_parent_name(np, 0);
324
325 clk_register_fixed_rate_with_accuracy(NULL, "hsi", NULL, 0,
326 16000000, 160000);
327 stm32f4_rcc_register_pll(hse_clk, "hsi");
328
329 sys_parents[1] = hse_clk;
330 clk_register_mux_table(
331 NULL, "sys", sys_parents, ARRAY_SIZE(sys_parents), 0,
332 base + STM32F4_RCC_CFGR, 0, 3, 0, NULL, &stm32f4_clk_lock);
333
334 clk_register_divider_table(NULL, "ahb_div", "sys",
335 CLK_SET_RATE_PARENT, base + STM32F4_RCC_CFGR,
336 4, 4, 0, ahb_div_table, &stm32f4_clk_lock);
337
338 clk_register_divider_table(NULL, "apb1_div", "ahb_div",
339 CLK_SET_RATE_PARENT, base + STM32F4_RCC_CFGR,
340 10, 3, 0, apb_div_table, &stm32f4_clk_lock);
341 clk_register_apb_mul(NULL, "apb1_mul", "apb1_div",
342 CLK_SET_RATE_PARENT, 12);
343
344 clk_register_divider_table(NULL, "apb2_div", "ahb_div",
345 CLK_SET_RATE_PARENT, base + STM32F4_RCC_CFGR,
346 13, 3, 0, apb_div_table, &stm32f4_clk_lock);
347 clk_register_apb_mul(NULL, "apb2_mul", "apb2_div",
348 CLK_SET_RATE_PARENT, 15);
349
350 clks[SYSTICK] = clk_register_fixed_factor(NULL, "systick", "ahb_div",
351 0, 1, 8);
352 clks[FCLK] = clk_register_fixed_factor(NULL, "fclk", "ahb_div",
353 0, 1, 1);
354
355 for (n = 0; n < ARRAY_SIZE(stm32f4_gates); n++) {
356 const struct stm32f4_gate_data *gd = &stm32f4_gates[n];
357 unsigned int secondary =
358 8 * (gd->offset - STM32F4_RCC_AHB1ENR) + gd->bit_idx;
359 int idx = stm32f4_rcc_lookup_clk_idx(0, secondary);
360
361 if (idx < 0)
362 goto fail;
363
364 clks[idx] = clk_register_gate(
365 NULL, gd->name, gd->parent_name, gd->flags,
366 base + gd->offset, gd->bit_idx, 0, &stm32f4_clk_lock);
367
368 if (IS_ERR(clks[n])) {
369 pr_err("%s: Unable to register leaf clock %s\n",
370 np->full_name, gd->name);
371 goto fail;
372 }
373 }
374
375 of_clk_add_provider(np, stm32f4_rcc_lookup_clk, NULL);
376 return;
377fail:
378 iounmap(base);
379}
380CLK_OF_DECLARE(stm32f4_rcc, "st,stm32f42xx-rcc", stm32f4_rcc_init);
381
