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fb92cc2c MS |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * (C) Copyright 2021 Xilinx, Inc. Michal Simek | |
4 | */ | |
5 | ||
6 | #define LOG_CATEGORY UCLASS_PWM | |
7 | ||
8 | #include <clk.h> | |
9 | #include <common.h> | |
10 | #include <div64.h> | |
11 | #include <dm.h> | |
12 | #include <log.h> | |
13 | #include <pwm.h> | |
14 | #include <asm/io.h> | |
15 | #include <log.h> | |
16 | #include <div64.h> | |
17 | #include <linux/bitfield.h> | |
18 | #include <linux/math64.h> | |
19 | #include <linux/log2.h> | |
13248d66 | 20 | #include <linux/time.h> |
fb92cc2c MS |
21 | #include <dm/device_compat.h> |
22 | ||
23 | #define CLOCK_CONTROL 0 | |
24 | #define COUNTER_CONTROL 0xc | |
25 | #define INTERVAL_COUNTER 0x24 | |
26 | #define MATCH_1_COUNTER 0x30 | |
27 | ||
28 | #define CLK_FALLING_EDGE BIT(6) | |
29 | #define CLK_SRC_EXTERNAL BIT(5) | |
30 | #define CLK_PRESCALE_MASK GENMASK(4, 1) | |
31 | #define CLK_PRESCALE_ENABLE BIT(0) | |
32 | ||
33 | #define COUNTER_WAVE_POL BIT(6) | |
34 | #define COUNTER_WAVE_DISABLE BIT(5) | |
35 | #define COUNTER_RESET BIT(4) | |
36 | #define COUNTER_MATCH_ENABLE BIT(3) | |
37 | #define COUNTER_DECREMENT_ENABLE BIT(2) | |
38 | #define COUNTER_INTERVAL_ENABLE BIT(1) | |
39 | #define COUNTER_COUNTING_DISABLE BIT(0) | |
40 | ||
fb92cc2c MS |
41 | #define TTC_REG(reg, channel) ((reg) + (channel) * sizeof(u32)) |
42 | #define TTC_CLOCK_CONTROL(reg, channel) \ | |
43 | TTC_REG((reg) + CLOCK_CONTROL, (channel)) | |
44 | #define TTC_COUNTER_CONTROL(reg, channel) \ | |
45 | TTC_REG((reg) + COUNTER_CONTROL, (channel)) | |
46 | #define TTC_INTERVAL_COUNTER(reg, channel) \ | |
47 | TTC_REG((reg) + INTERVAL_COUNTER, (channel)) | |
48 | #define TTC_MATCH_1_COUNTER(reg, channel) \ | |
49 | TTC_REG((reg) + MATCH_1_COUNTER, (channel)) | |
50 | ||
51 | struct cadence_ttc_pwm_plat { | |
52 | u8 *regs; | |
53 | u32 timer_width; | |
54 | }; | |
55 | ||
56 | struct cadence_ttc_pwm_priv { | |
57 | u8 *regs; | |
58 | u32 timer_width; | |
59 | u32 timer_mask; | |
60 | unsigned long frequency; | |
61 | bool invert[2]; | |
62 | }; | |
63 | ||
64 | static int cadence_ttc_pwm_set_invert(struct udevice *dev, uint channel, | |
65 | bool polarity) | |
66 | { | |
67 | struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev); | |
68 | ||
69 | if (channel > 2) { | |
70 | dev_err(dev, "Unsupported channel number %d(max 2)\n", channel); | |
71 | return -EINVAL; | |
72 | } | |
73 | ||
74 | priv->invert[channel] = polarity; | |
75 | ||
76 | dev_dbg(dev, "polarity=%u. Please config PWM again\n", polarity); | |
77 | ||
78 | return 0; | |
79 | } | |
80 | ||
81 | static int cadence_ttc_pwm_set_config(struct udevice *dev, uint channel, | |
82 | uint period_ns, uint duty_ns) | |
83 | { | |
84 | struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev); | |
85 | u32 counter_ctrl, clock_ctrl; | |
86 | int period_clocks, duty_clocks, prescaler; | |
87 | ||
88 | dev_dbg(dev, "channel %d, duty %d/period %d ns\n", channel, | |
89 | duty_ns, period_ns); | |
90 | ||
91 | if (channel > 2) { | |
92 | dev_err(dev, "Unsupported channel number %d(max 2)\n", channel); | |
93 | return -EINVAL; | |
94 | } | |
95 | ||
96 | /* Make sure counter is stopped */ | |
97 | counter_ctrl = readl(TTC_COUNTER_CONTROL(priv->regs, channel)); | |
98 | setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel), | |
99 | COUNTER_COUNTING_DISABLE | COUNTER_WAVE_DISABLE); | |
100 | ||
101 | /* Calculate period, prescaler and set clock control register */ | |
102 | period_clocks = div64_u64(((int64_t)period_ns * priv->frequency), | |
103 | NSEC_PER_SEC); | |
104 | ||
105 | prescaler = ilog2(period_clocks) + 1 - priv->timer_width; | |
106 | if (prescaler < 0) | |
107 | prescaler = 0; | |
108 | ||
109 | clock_ctrl = readl(TTC_CLOCK_CONTROL(priv->regs, channel)); | |
110 | ||
111 | if (!prescaler) { | |
112 | clock_ctrl &= ~(CLK_PRESCALE_ENABLE | CLK_PRESCALE_MASK); | |
113 | } else { | |
114 | clock_ctrl &= ~CLK_PRESCALE_MASK; | |
115 | clock_ctrl |= CLK_PRESCALE_ENABLE; | |
116 | clock_ctrl |= FIELD_PREP(CLK_PRESCALE_MASK, prescaler - 1); | |
117 | }; | |
118 | ||
119 | /* External source is not handled by this driver now */ | |
120 | clock_ctrl &= ~CLK_SRC_EXTERNAL; | |
121 | ||
122 | writel(clock_ctrl, TTC_CLOCK_CONTROL(priv->regs, channel)); | |
123 | ||
124 | /* Calculate interval and set counter control value */ | |
125 | duty_clocks = div64_u64(((int64_t)duty_ns * priv->frequency), | |
126 | NSEC_PER_SEC); | |
127 | ||
128 | writel((period_clocks >> prescaler) & priv->timer_mask, | |
129 | TTC_INTERVAL_COUNTER(priv->regs, channel)); | |
130 | writel((duty_clocks >> prescaler) & priv->timer_mask, | |
131 | TTC_MATCH_1_COUNTER(priv->regs, channel)); | |
132 | ||
133 | /* Restore/reset counter */ | |
134 | counter_ctrl &= ~COUNTER_DECREMENT_ENABLE; | |
135 | counter_ctrl |= COUNTER_INTERVAL_ENABLE | | |
136 | COUNTER_RESET | | |
137 | COUNTER_MATCH_ENABLE; | |
138 | ||
139 | if (priv->invert[channel]) | |
140 | counter_ctrl |= COUNTER_WAVE_POL; | |
141 | else | |
142 | counter_ctrl &= ~COUNTER_WAVE_POL; | |
143 | ||
144 | writel(counter_ctrl, TTC_COUNTER_CONTROL(priv->regs, channel)); | |
145 | ||
146 | dev_dbg(dev, "%d/%d clocks, prescaler 2^%d\n", duty_clocks, | |
147 | period_clocks, prescaler); | |
148 | ||
149 | return 0; | |
150 | }; | |
151 | ||
152 | static int cadence_ttc_pwm_set_enable(struct udevice *dev, uint channel, | |
153 | bool enable) | |
154 | { | |
155 | struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev); | |
156 | ||
157 | if (channel > 2) { | |
158 | dev_err(dev, "Unsupported channel number %d(max 2)\n", channel); | |
159 | return -EINVAL; | |
160 | } | |
161 | ||
162 | dev_dbg(dev, "Enable: %d, channel %d\n", enable, channel); | |
163 | ||
164 | if (enable) { | |
165 | clrbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel), | |
166 | COUNTER_COUNTING_DISABLE | | |
167 | COUNTER_WAVE_DISABLE); | |
168 | setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel), | |
169 | COUNTER_RESET); | |
170 | } else { | |
171 | setbits_le32(TTC_COUNTER_CONTROL(priv->regs, channel), | |
172 | COUNTER_COUNTING_DISABLE | | |
173 | COUNTER_WAVE_DISABLE); | |
174 | } | |
175 | ||
176 | return 0; | |
177 | }; | |
178 | ||
179 | static int cadence_ttc_pwm_probe(struct udevice *dev) | |
180 | { | |
181 | struct cadence_ttc_pwm_priv *priv = dev_get_priv(dev); | |
182 | struct cadence_ttc_pwm_plat *plat = dev_get_plat(dev); | |
183 | struct clk clk; | |
184 | int ret; | |
185 | ||
186 | priv->regs = plat->regs; | |
187 | priv->timer_width = plat->timer_width; | |
188 | priv->timer_mask = GENMASK(priv->timer_width - 1, 0); | |
189 | ||
190 | ret = clk_get_by_index(dev, 0, &clk); | |
191 | if (ret < 0) { | |
192 | dev_err(dev, "failed to get clock\n"); | |
193 | return ret; | |
194 | } | |
195 | ||
196 | priv->frequency = clk_get_rate(&clk); | |
197 | if (IS_ERR_VALUE(priv->frequency)) { | |
198 | dev_err(dev, "failed to get rate\n"); | |
199 | return priv->frequency; | |
200 | } | |
201 | dev_dbg(dev, "Clk frequency: %ld\n", priv->frequency); | |
202 | ||
203 | ret = clk_enable(&clk); | |
204 | if (ret) { | |
205 | dev_err(dev, "failed to enable clock\n"); | |
206 | return ret; | |
207 | } | |
208 | ||
209 | return 0; | |
210 | } | |
211 | ||
212 | static int cadence_ttc_pwm_of_to_plat(struct udevice *dev) | |
213 | { | |
214 | struct cadence_ttc_pwm_plat *plat = dev_get_plat(dev); | |
215 | const char *cells; | |
216 | ||
217 | cells = dev_read_prop(dev, "#pwm-cells", NULL); | |
218 | if (!cells) | |
219 | return -EINVAL; | |
220 | ||
221 | plat->regs = dev_read_addr_ptr(dev); | |
222 | ||
223 | plat->timer_width = dev_read_u32_default(dev, "timer-width", 16); | |
224 | ||
225 | return 0; | |
226 | } | |
227 | ||
228 | static int cadence_ttc_pwm_bind(struct udevice *dev) | |
229 | { | |
230 | const char *cells; | |
231 | ||
232 | cells = dev_read_prop(dev, "#pwm-cells", NULL); | |
233 | if (!cells) | |
234 | return -ENODEV; | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static const struct pwm_ops cadence_ttc_pwm_ops = { | |
240 | .set_invert = cadence_ttc_pwm_set_invert, | |
241 | .set_config = cadence_ttc_pwm_set_config, | |
242 | .set_enable = cadence_ttc_pwm_set_enable, | |
243 | }; | |
244 | ||
245 | static const struct udevice_id cadence_ttc_pwm_ids[] = { | |
246 | { .compatible = "cdns,ttc" }, | |
247 | { } | |
248 | }; | |
249 | ||
250 | U_BOOT_DRIVER(cadence_ttc_pwm) = { | |
251 | .name = "cadence_ttc_pwm", | |
252 | .id = UCLASS_PWM, | |
253 | .of_match = cadence_ttc_pwm_ids, | |
254 | .ops = &cadence_ttc_pwm_ops, | |
255 | .bind = cadence_ttc_pwm_bind, | |
256 | .of_to_plat = cadence_ttc_pwm_of_to_plat, | |
257 | .probe = cadence_ttc_pwm_probe, | |
258 | .priv_auto = sizeof(struct cadence_ttc_pwm_priv), | |
259 | .plat_auto = sizeof(struct cadence_ttc_pwm_plat), | |
260 | }; |