1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/clk-provider.h>
3 #include <linux/mfd/syscon.h>
4 #include <linux/slab.h>
5
6 #include <dt-bindings/clock/at91.h>
7
8 #include "pmc.h"
9
10 static DEFINE_SPINLOCK(at91sam9g45_mck_lock);
11
12 static const struct clk_master_characteristics mck_characteristics = {
13 .output = { .min = 0, .max = 133333333 },
14 .divisors = { 1, 2, 4, 3 },
15 };
16
17 static u8 plla_out[] = { 0, 1, 2, 3, 0, 1, 2, 3 };
18
19 static u16 plla_icpll[] = { 0, 0, 0, 0, 1, 1, 1, 1 };
20
21 static const struct clk_range plla_outputs[] = {
22 { .min = 745000000, .max = 800000000 },
23 { .min = 695000000, .max = 750000000 },
24 { .min = 645000000, .max = 700000000 },
25 { .min = 595000000, .max = 650000000 },
26 { .min = 545000000, .max = 600000000 },
27 { .min = 495000000, .max = 555000000 },
28 { .min = 445000000, .max = 500000000 },
29 { .min = 400000000, .max = 450000000 },
30 };
31
32 static const struct clk_pll_characteristics plla_characteristics = {
33 .input = { .min = 2000000, .max = 32000000 },
34 .num_output = ARRAY_SIZE(plla_outputs),
35 .output = plla_outputs,
36 .icpll = plla_icpll,
37 .out = plla_out,
38 };
39
40 static const struct {
41 char *n;
42 char *p;
43 unsigned long flags;
44 u8 id;
45 } at91sam9g45_systemck[] = {
46 /*
47 * ddrck feeds DDR controller and is enabled by bootloader thus we need
48 * to keep it enabled in case there is no Linux consumer for it.
49 */
50 { .n = "ddrck", .p = "masterck_div", .id = 2, .flags = CLK_IS_CRITICAL },
51 { .n = "uhpck", .p = "usbck", .id = 6 },
52 { .n = "pck0", .p = "prog0", .id = 8 },
53 { .n = "pck1", .p = "prog1", .id = 9 },
54 };
55
56 struct pck {
57 char *n;
58 u8 id;
59 };
60
61 static const struct pck at91sam9g45_periphck[] = {
62 { .n = "pioA_clk", .id = 2, },
63 { .n = "pioB_clk", .id = 3, },
64 { .n = "pioC_clk", .id = 4, },
65 { .n = "pioDE_clk", .id = 5, },
66 { .n = "trng_clk", .id = 6, },
67 { .n = "usart0_clk", .id = 7, },
68 { .n = "usart1_clk", .id = 8, },
69 { .n = "usart2_clk", .id = 9, },
70 { .n = "usart3_clk", .id = 10, },
71 { .n = "mci0_clk", .id = 11, },
72 { .n = "twi0_clk", .id = 12, },
73 { .n = "twi1_clk", .id = 13, },
74 { .n = "spi0_clk", .id = 14, },
75 { .n = "spi1_clk", .id = 15, },
76 { .n = "ssc0_clk", .id = 16, },
77 { .n = "ssc1_clk", .id = 17, },
78 { .n = "tcb0_clk", .id = 18, },
79 { .n = "pwm_clk", .id = 19, },
80 { .n = "adc_clk", .id = 20, },
81 { .n = "dma0_clk", .id = 21, },
82 { .n = "uhphs_clk", .id = 22, },
83 { .n = "lcd_clk", .id = 23, },
84 { .n = "ac97_clk", .id = 24, },
85 { .n = "macb0_clk", .id = 25, },
86 { .n = "isi_clk", .id = 26, },
87 { .n = "udphs_clk", .id = 27, },
88 { .n = "aestdessha_clk", .id = 28, },
89 { .n = "mci1_clk", .id = 29, },
90 { .n = "vdec_clk", .id = 30, },
91 };
92
at91sam9g45_pmc_setup(struct device_node * np)93 static void __init at91sam9g45_pmc_setup(struct device_node *np)
94 {
95 const char *slck_name, *mainxtal_name;
96 struct pmc_data *at91sam9g45_pmc;
97 const char *parent_names[6];
98 struct regmap *regmap;
99 struct clk_hw *hw;
100 int i;
101 bool bypass;
102
103 i = of_property_match_string(np, "clock-names", "slow_clk");
104 if (i < 0)
105 return;
106
107 slck_name = of_clk_get_parent_name(np, i);
108
109 i = of_property_match_string(np, "clock-names", "main_xtal");
110 if (i < 0)
111 return;
112 mainxtal_name = of_clk_get_parent_name(np, i);
113
114 regmap = device_node_to_regmap(np);
115 if (IS_ERR(regmap))
116 return;
117
118 at91sam9g45_pmc = pmc_data_allocate(PMC_PLLACK + 1,
119 nck(at91sam9g45_systemck),
120 nck(at91sam9g45_periphck), 0, 2);
121 if (!at91sam9g45_pmc)
122 return;
123
124 bypass = of_property_read_bool(np, "atmel,osc-bypass");
125
126 hw = at91_clk_register_main_osc(regmap, "main_osc", mainxtal_name, NULL,
127 bypass);
128 if (IS_ERR(hw))
129 goto err_free;
130
131 hw = at91_clk_register_rm9200_main(regmap, "mainck", "main_osc", NULL);
132 if (IS_ERR(hw))
133 goto err_free;
134
135 at91sam9g45_pmc->chws[PMC_MAIN] = hw;
136
137 hw = at91_clk_register_pll(regmap, "pllack", "mainck", 0,
138 &at91rm9200_pll_layout, &plla_characteristics);
139 if (IS_ERR(hw))
140 goto err_free;
141
142 hw = at91_clk_register_plldiv(regmap, "plladivck", "pllack");
143 if (IS_ERR(hw))
144 goto err_free;
145
146 at91sam9g45_pmc->chws[PMC_PLLACK] = hw;
147
148 hw = at91_clk_register_utmi(regmap, NULL, "utmick", "mainck", NULL);
149 if (IS_ERR(hw))
150 goto err_free;
151
152 at91sam9g45_pmc->chws[PMC_UTMI] = hw;
153
154 parent_names[0] = slck_name;
155 parent_names[1] = "mainck";
156 parent_names[2] = "plladivck";
157 parent_names[3] = "utmick";
158 hw = at91_clk_register_master_pres(regmap, "masterck_pres", 4,
159 parent_names, NULL,
160 &at91rm9200_master_layout,
161 &mck_characteristics,
162 &at91sam9g45_mck_lock);
163 if (IS_ERR(hw))
164 goto err_free;
165
166 hw = at91_clk_register_master_div(regmap, "masterck_div",
167 "masterck_pres", NULL,
168 &at91rm9200_master_layout,
169 &mck_characteristics,
170 &at91sam9g45_mck_lock,
171 CLK_SET_RATE_GATE, 0);
172 if (IS_ERR(hw))
173 goto err_free;
174
175 at91sam9g45_pmc->chws[PMC_MCK] = hw;
176
177 parent_names[0] = "plladivck";
178 parent_names[1] = "utmick";
179 hw = at91sam9x5_clk_register_usb(regmap, "usbck", parent_names, 2);
180 if (IS_ERR(hw))
181 goto err_free;
182
183 parent_names[0] = slck_name;
184 parent_names[1] = "mainck";
185 parent_names[2] = "plladivck";
186 parent_names[3] = "utmick";
187 parent_names[4] = "masterck_div";
188 for (i = 0; i < 2; i++) {
189 char name[6];
190
191 snprintf(name, sizeof(name), "prog%d", i);
192
193 hw = at91_clk_register_programmable(regmap, name,
194 parent_names, NULL, 5, i,
195 &at91sam9g45_programmable_layout,
196 NULL);
197 if (IS_ERR(hw))
198 goto err_free;
199
200 at91sam9g45_pmc->pchws[i] = hw;
201 }
202
203 for (i = 0; i < ARRAY_SIZE(at91sam9g45_systemck); i++) {
204 hw = at91_clk_register_system(regmap, at91sam9g45_systemck[i].n,
205 at91sam9g45_systemck[i].p, NULL,
206 at91sam9g45_systemck[i].id,
207 at91sam9g45_systemck[i].flags);
208 if (IS_ERR(hw))
209 goto err_free;
210
211 at91sam9g45_pmc->shws[at91sam9g45_systemck[i].id] = hw;
212 }
213
214 for (i = 0; i < ARRAY_SIZE(at91sam9g45_periphck); i++) {
215 hw = at91_clk_register_peripheral(regmap,
216 at91sam9g45_periphck[i].n,
217 "masterck_div", NULL,
218 at91sam9g45_periphck[i].id);
219 if (IS_ERR(hw))
220 goto err_free;
221
222 at91sam9g45_pmc->phws[at91sam9g45_periphck[i].id] = hw;
223 }
224
225 of_clk_add_hw_provider(np, of_clk_hw_pmc_get, at91sam9g45_pmc);
226
227 return;
228
229 err_free:
230 kfree(at91sam9g45_pmc);
231 }
232 /*
233 * The TCB is used as the clocksource so its clock is needed early. This means
234 * this can't be a platform driver.
235 */
236 CLK_OF_DECLARE(at91sam9g45_pmc, "atmel,at91sam9g45-pmc", at91sam9g45_pmc_setup);
237