1 /*
2 * SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2018, The Linux Foundation
4 */
5
6 #include <linux/clk.h>
7 #include <linux/clk-provider.h>
8 #include <linux/iopoll.h>
9
10 #include "dsi_pll.h"
11 #include "dsi.xml.h"
12
13 /*
14 * DSI PLL 10nm - clock diagram (eg: DSI0):
15 *
16 * dsi0_pll_out_div_clk dsi0_pll_bit_clk
17 * | |
18 * | |
19 * +---------+ | +----------+ | +----+
20 * dsi0vco_clk ---| out_div |--o--| divl_3_0 |--o--| /8 |-- dsi0_phy_pll_out_byteclk
21 * +---------+ | +----------+ | +----+
22 * | |
23 * | | dsi0_pll_by_2_bit_clk
24 * | | |
25 * | | +----+ | |\ dsi0_pclk_mux
26 * | |--| /2 |--o--| \ |
27 * | | +----+ | \ | +---------+
28 * | --------------| |--o--| div_7_4 |-- dsi0_phy_pll_out_dsiclk
29 * |------------------------------| / +---------+
30 * | +-----+ | /
31 * -----------| /4? |--o----------|/
32 * +-----+ | |
33 * | |dsiclk_sel
34 * |
35 * dsi0_pll_post_out_div_clk
36 */
37
38 #define DSI_BYTE_PLL_CLK 0
39 #define DSI_PIXEL_PLL_CLK 1
40 #define NUM_PROVIDED_CLKS 2
41
42 #define VCO_REF_CLK_RATE 19200000
43
44 struct dsi_pll_regs {
45 u32 pll_prop_gain_rate;
46 u32 pll_lockdet_rate;
47 u32 decimal_div_start;
48 u32 frac_div_start_low;
49 u32 frac_div_start_mid;
50 u32 frac_div_start_high;
51 u32 pll_clock_inverters;
52 u32 ssc_stepsize_low;
53 u32 ssc_stepsize_high;
54 u32 ssc_div_per_low;
55 u32 ssc_div_per_high;
56 u32 ssc_adjper_low;
57 u32 ssc_adjper_high;
58 u32 ssc_control;
59 };
60
61 struct dsi_pll_config {
62 u32 ref_freq;
63 bool div_override;
64 u32 output_div;
65 bool ignore_frac;
66 bool disable_prescaler;
67 bool enable_ssc;
68 bool ssc_center;
69 u32 dec_bits;
70 u32 frac_bits;
71 u32 lock_timer;
72 u32 ssc_freq;
73 u32 ssc_offset;
74 u32 ssc_adj_per;
75 u32 thresh_cycles;
76 u32 refclk_cycles;
77 };
78
79 struct pll_10nm_cached_state {
80 unsigned long vco_rate;
81 u8 bit_clk_div;
82 u8 pix_clk_div;
83 u8 pll_out_div;
84 u8 pll_mux;
85 };
86
87 struct dsi_pll_10nm {
88 struct msm_dsi_pll base;
89
90 int id;
91 struct platform_device *pdev;
92
93 void __iomem *phy_cmn_mmio;
94 void __iomem *mmio;
95
96 u64 vco_ref_clk_rate;
97 u64 vco_current_rate;
98
99 /* protects REG_DSI_10nm_PHY_CMN_CLK_CFG0 register */
100 spinlock_t postdiv_lock;
101
102 int vco_delay;
103 struct dsi_pll_config pll_configuration;
104 struct dsi_pll_regs reg_setup;
105
106 /* private clocks: */
107 struct clk_hw *out_div_clk_hw;
108 struct clk_hw *bit_clk_hw;
109 struct clk_hw *byte_clk_hw;
110 struct clk_hw *by_2_bit_clk_hw;
111 struct clk_hw *post_out_div_clk_hw;
112 struct clk_hw *pclk_mux_hw;
113 struct clk_hw *out_dsiclk_hw;
114
115 /* clock-provider: */
116 struct clk_hw_onecell_data *hw_data;
117
118 struct pll_10nm_cached_state cached_state;
119
120 enum msm_dsi_phy_usecase uc;
121 struct dsi_pll_10nm *slave;
122 };
123
124 #define to_pll_10nm(x) container_of(x, struct dsi_pll_10nm, base)
125
126 /*
127 * Global list of private DSI PLL struct pointers. We need this for Dual DSI
128 * mode, where the master PLL's clk_ops needs access the slave's private data
129 */
130 static struct dsi_pll_10nm *pll_10nm_list[DSI_MAX];
131
dsi_pll_setup_config(struct dsi_pll_10nm * pll)132 static void dsi_pll_setup_config(struct dsi_pll_10nm *pll)
133 {
134 struct dsi_pll_config *config = &pll->pll_configuration;
135
136 config->ref_freq = pll->vco_ref_clk_rate;
137 config->output_div = 1;
138 config->dec_bits = 8;
139 config->frac_bits = 18;
140 config->lock_timer = 64;
141 config->ssc_freq = 31500;
142 config->ssc_offset = 5000;
143 config->ssc_adj_per = 2;
144 config->thresh_cycles = 32;
145 config->refclk_cycles = 256;
146
147 config->div_override = false;
148 config->ignore_frac = false;
149 config->disable_prescaler = false;
150
151 config->enable_ssc = false;
152 config->ssc_center = 0;
153 }
154
dsi_pll_calc_dec_frac(struct dsi_pll_10nm * pll)155 static void dsi_pll_calc_dec_frac(struct dsi_pll_10nm *pll)
156 {
157 struct dsi_pll_config *config = &pll->pll_configuration;
158 struct dsi_pll_regs *regs = &pll->reg_setup;
159 u64 fref = pll->vco_ref_clk_rate;
160 u64 pll_freq;
161 u64 divider;
162 u64 dec, dec_multiple;
163 u32 frac;
164 u64 multiplier;
165
166 pll_freq = pll->vco_current_rate;
167
168 if (config->disable_prescaler)
169 divider = fref;
170 else
171 divider = fref * 2;
172
173 multiplier = 1 << config->frac_bits;
174 dec_multiple = div_u64(pll_freq * multiplier, divider);
175 div_u64_rem(dec_multiple, multiplier, &frac);
176
177 dec = div_u64(dec_multiple, multiplier);
178
179 if (pll_freq <= 1900000000UL)
180 regs->pll_prop_gain_rate = 8;
181 else if (pll_freq <= 3000000000UL)
182 regs->pll_prop_gain_rate = 10;
183 else
184 regs->pll_prop_gain_rate = 12;
185 if (pll_freq < 1100000000UL)
186 regs->pll_clock_inverters = 8;
187 else
188 regs->pll_clock_inverters = 0;
189
190 regs->pll_lockdet_rate = config->lock_timer;
191 regs->decimal_div_start = dec;
192 regs->frac_div_start_low = (frac & 0xff);
193 regs->frac_div_start_mid = (frac & 0xff00) >> 8;
194 regs->frac_div_start_high = (frac & 0x30000) >> 16;
195 }
196
197 #define SSC_CENTER BIT(0)
198 #define SSC_EN BIT(1)
199
dsi_pll_calc_ssc(struct dsi_pll_10nm * pll)200 static void dsi_pll_calc_ssc(struct dsi_pll_10nm *pll)
201 {
202 struct dsi_pll_config *config = &pll->pll_configuration;
203 struct dsi_pll_regs *regs = &pll->reg_setup;
204 u32 ssc_per;
205 u32 ssc_mod;
206 u64 ssc_step_size;
207 u64 frac;
208
209 if (!config->enable_ssc) {
210 DBG("SSC not enabled\n");
211 return;
212 }
213
214 ssc_per = DIV_ROUND_CLOSEST(config->ref_freq, config->ssc_freq) / 2 - 1;
215 ssc_mod = (ssc_per + 1) % (config->ssc_adj_per + 1);
216 ssc_per -= ssc_mod;
217
218 frac = regs->frac_div_start_low |
219 (regs->frac_div_start_mid << 8) |
220 (regs->frac_div_start_high << 16);
221 ssc_step_size = regs->decimal_div_start;
222 ssc_step_size *= (1 << config->frac_bits);
223 ssc_step_size += frac;
224 ssc_step_size *= config->ssc_offset;
225 ssc_step_size *= (config->ssc_adj_per + 1);
226 ssc_step_size = div_u64(ssc_step_size, (ssc_per + 1));
227 ssc_step_size = DIV_ROUND_CLOSEST_ULL(ssc_step_size, 1000000);
228
229 regs->ssc_div_per_low = ssc_per & 0xFF;
230 regs->ssc_div_per_high = (ssc_per & 0xFF00) >> 8;
231 regs->ssc_stepsize_low = (u32)(ssc_step_size & 0xFF);
232 regs->ssc_stepsize_high = (u32)((ssc_step_size & 0xFF00) >> 8);
233 regs->ssc_adjper_low = config->ssc_adj_per & 0xFF;
234 regs->ssc_adjper_high = (config->ssc_adj_per & 0xFF00) >> 8;
235
236 regs->ssc_control = config->ssc_center ? SSC_CENTER : 0;
237
238 pr_debug("SCC: Dec:%d, frac:%llu, frac_bits:%d\n",
239 regs->decimal_div_start, frac, config->frac_bits);
240 pr_debug("SSC: div_per:0x%X, stepsize:0x%X, adjper:0x%X\n",
241 ssc_per, (u32)ssc_step_size, config->ssc_adj_per);
242 }
243
dsi_pll_ssc_commit(struct dsi_pll_10nm * pll)244 static void dsi_pll_ssc_commit(struct dsi_pll_10nm *pll)
245 {
246 void __iomem *base = pll->mmio;
247 struct dsi_pll_regs *regs = &pll->reg_setup;
248
249 if (pll->pll_configuration.enable_ssc) {
250 pr_debug("SSC is enabled\n");
251
252 pll_write(base + REG_DSI_10nm_PHY_PLL_SSC_STEPSIZE_LOW_1,
253 regs->ssc_stepsize_low);
254 pll_write(base + REG_DSI_10nm_PHY_PLL_SSC_STEPSIZE_HIGH_1,
255 regs->ssc_stepsize_high);
256 pll_write(base + REG_DSI_10nm_PHY_PLL_SSC_DIV_PER_LOW_1,
257 regs->ssc_div_per_low);
258 pll_write(base + REG_DSI_10nm_PHY_PLL_SSC_DIV_PER_HIGH_1,
259 regs->ssc_div_per_high);
260 pll_write(base + REG_DSI_10nm_PHY_PLL_SSC_DIV_ADJPER_LOW_1,
261 regs->ssc_adjper_low);
262 pll_write(base + REG_DSI_10nm_PHY_PLL_SSC_DIV_ADJPER_HIGH_1,
263 regs->ssc_adjper_high);
264 pll_write(base + REG_DSI_10nm_PHY_PLL_SSC_CONTROL,
265 SSC_EN | regs->ssc_control);
266 }
267 }
268
dsi_pll_config_hzindep_reg(struct dsi_pll_10nm * pll)269 static void dsi_pll_config_hzindep_reg(struct dsi_pll_10nm *pll)
270 {
271 void __iomem *base = pll->mmio;
272
273 pll_write(base + REG_DSI_10nm_PHY_PLL_ANALOG_CONTROLS_ONE, 0x80);
274 pll_write(base + REG_DSI_10nm_PHY_PLL_ANALOG_CONTROLS_TWO, 0x03);
275 pll_write(base + REG_DSI_10nm_PHY_PLL_ANALOG_CONTROLS_THREE, 0x00);
276 pll_write(base + REG_DSI_10nm_PHY_PLL_DSM_DIVIDER, 0x00);
277 pll_write(base + REG_DSI_10nm_PHY_PLL_FEEDBACK_DIVIDER, 0x4e);
278 pll_write(base + REG_DSI_10nm_PHY_PLL_CALIBRATION_SETTINGS, 0x40);
279 pll_write(base + REG_DSI_10nm_PHY_PLL_BAND_SEL_CAL_SETTINGS_THREE,
280 0xba);
281 pll_write(base + REG_DSI_10nm_PHY_PLL_FREQ_DETECT_SETTINGS_ONE, 0x0c);
282 pll_write(base + REG_DSI_10nm_PHY_PLL_OUTDIV, 0x00);
283 pll_write(base + REG_DSI_10nm_PHY_PLL_CORE_OVERRIDE, 0x00);
284 pll_write(base + REG_DSI_10nm_PHY_PLL_PLL_DIGITAL_TIMERS_TWO, 0x08);
285 pll_write(base + REG_DSI_10nm_PHY_PLL_PLL_PROP_GAIN_RATE_1, 0x08);
286 pll_write(base + REG_DSI_10nm_PHY_PLL_PLL_BAND_SET_RATE_1, 0xc0);
287 pll_write(base + REG_DSI_10nm_PHY_PLL_PLL_INT_GAIN_IFILT_BAND_1, 0xfa);
288 pll_write(base + REG_DSI_10nm_PHY_PLL_PLL_FL_INT_GAIN_PFILT_BAND_1,
289 0x4c);
290 pll_write(base + REG_DSI_10nm_PHY_PLL_PLL_LOCK_OVERRIDE, 0x80);
291 pll_write(base + REG_DSI_10nm_PHY_PLL_PFILT, 0x29);
292 pll_write(base + REG_DSI_10nm_PHY_PLL_IFILT, 0x3f);
293 }
294
dsi_pll_commit(struct dsi_pll_10nm * pll)295 static void dsi_pll_commit(struct dsi_pll_10nm *pll)
296 {
297 void __iomem *base = pll->mmio;
298 struct dsi_pll_regs *reg = &pll->reg_setup;
299
300 pll_write(base + REG_DSI_10nm_PHY_PLL_CORE_INPUT_OVERRIDE, 0x12);
301 pll_write(base + REG_DSI_10nm_PHY_PLL_DECIMAL_DIV_START_1,
302 reg->decimal_div_start);
303 pll_write(base + REG_DSI_10nm_PHY_PLL_FRAC_DIV_START_LOW_1,
304 reg->frac_div_start_low);
305 pll_write(base + REG_DSI_10nm_PHY_PLL_FRAC_DIV_START_MID_1,
306 reg->frac_div_start_mid);
307 pll_write(base + REG_DSI_10nm_PHY_PLL_FRAC_DIV_START_HIGH_1,
308 reg->frac_div_start_high);
309 pll_write(base + REG_DSI_10nm_PHY_PLL_PLL_LOCKDET_RATE_1, 0x40);
310 pll_write(base + REG_DSI_10nm_PHY_PLL_PLL_LOCK_DELAY, 0x06);
311 pll_write(base + REG_DSI_10nm_PHY_PLL_CMODE, 0x10);
312 pll_write(base + REG_DSI_10nm_PHY_PLL_CLOCK_INVERTERS,
313 reg->pll_clock_inverters);
314 }
315
dsi_pll_10nm_vco_set_rate(struct clk_hw * hw,unsigned long rate,unsigned long parent_rate)316 static int dsi_pll_10nm_vco_set_rate(struct clk_hw *hw, unsigned long rate,
317 unsigned long parent_rate)
318 {
319 struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
320 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
321
322 DBG("DSI PLL%d rate=%lu, parent's=%lu", pll_10nm->id, rate,
323 parent_rate);
324
325 pll_10nm->vco_current_rate = rate;
326 pll_10nm->vco_ref_clk_rate = VCO_REF_CLK_RATE;
327
328 dsi_pll_setup_config(pll_10nm);
329
330 dsi_pll_calc_dec_frac(pll_10nm);
331
332 dsi_pll_calc_ssc(pll_10nm);
333
334 dsi_pll_commit(pll_10nm);
335
336 dsi_pll_config_hzindep_reg(pll_10nm);
337
338 dsi_pll_ssc_commit(pll_10nm);
339
340 /* flush, ensure all register writes are done*/
341 wmb();
342
343 return 0;
344 }
345
dsi_pll_10nm_lock_status(struct dsi_pll_10nm * pll)346 static int dsi_pll_10nm_lock_status(struct dsi_pll_10nm *pll)
347 {
348 int rc;
349 u32 status = 0;
350 u32 const delay_us = 100;
351 u32 const timeout_us = 5000;
352
353 rc = readl_poll_timeout_atomic(pll->mmio +
354 REG_DSI_10nm_PHY_PLL_COMMON_STATUS_ONE,
355 status,
356 ((status & BIT(0)) > 0),
357 delay_us,
358 timeout_us);
359 if (rc)
360 pr_err("DSI PLL(%d) lock failed, status=0x%08x\n",
361 pll->id, status);
362
363 return rc;
364 }
365
dsi_pll_disable_pll_bias(struct dsi_pll_10nm * pll)366 static void dsi_pll_disable_pll_bias(struct dsi_pll_10nm *pll)
367 {
368 u32 data = pll_read(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CTRL_0);
369
370 pll_write(pll->mmio + REG_DSI_10nm_PHY_PLL_SYSTEM_MUXES, 0);
371 pll_write(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CTRL_0,
372 data & ~BIT(5));
373 ndelay(250);
374 }
375
dsi_pll_enable_pll_bias(struct dsi_pll_10nm * pll)376 static void dsi_pll_enable_pll_bias(struct dsi_pll_10nm *pll)
377 {
378 u32 data = pll_read(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CTRL_0);
379
380 pll_write(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CTRL_0,
381 data | BIT(5));
382 pll_write(pll->mmio + REG_DSI_10nm_PHY_PLL_SYSTEM_MUXES, 0xc0);
383 ndelay(250);
384 }
385
dsi_pll_disable_global_clk(struct dsi_pll_10nm * pll)386 static void dsi_pll_disable_global_clk(struct dsi_pll_10nm *pll)
387 {
388 u32 data;
389
390 data = pll_read(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CLK_CFG1);
391 pll_write(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CLK_CFG1,
392 data & ~BIT(5));
393 }
394
dsi_pll_enable_global_clk(struct dsi_pll_10nm * pll)395 static void dsi_pll_enable_global_clk(struct dsi_pll_10nm *pll)
396 {
397 u32 data;
398
399 data = pll_read(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CLK_CFG1);
400 pll_write(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_CLK_CFG1,
401 data | BIT(5));
402 }
403
dsi_pll_10nm_vco_prepare(struct clk_hw * hw)404 static int dsi_pll_10nm_vco_prepare(struct clk_hw *hw)
405 {
406 struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
407 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
408 int rc;
409
410 dsi_pll_enable_pll_bias(pll_10nm);
411 if (pll_10nm->slave)
412 dsi_pll_enable_pll_bias(pll_10nm->slave);
413
414 /* Start PLL */
415 pll_write(pll_10nm->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_PLL_CNTRL,
416 0x01);
417
418 /*
419 * ensure all PLL configurations are written prior to checking
420 * for PLL lock.
421 */
422 wmb();
423
424 /* Check for PLL lock */
425 rc = dsi_pll_10nm_lock_status(pll_10nm);
426 if (rc) {
427 pr_err("PLL(%d) lock failed\n", pll_10nm->id);
428 goto error;
429 }
430
431 pll->pll_on = true;
432
433 dsi_pll_enable_global_clk(pll_10nm);
434 if (pll_10nm->slave)
435 dsi_pll_enable_global_clk(pll_10nm->slave);
436
437 pll_write(pll_10nm->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_RBUF_CTRL,
438 0x01);
439 if (pll_10nm->slave)
440 pll_write(pll_10nm->slave->phy_cmn_mmio +
441 REG_DSI_10nm_PHY_CMN_RBUF_CTRL, 0x01);
442
443 error:
444 return rc;
445 }
446
dsi_pll_disable_sub(struct dsi_pll_10nm * pll)447 static void dsi_pll_disable_sub(struct dsi_pll_10nm *pll)
448 {
449 pll_write(pll->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_RBUF_CTRL, 0);
450 dsi_pll_disable_pll_bias(pll);
451 }
452
dsi_pll_10nm_vco_unprepare(struct clk_hw * hw)453 static void dsi_pll_10nm_vco_unprepare(struct clk_hw *hw)
454 {
455 struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
456 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
457
458 /*
459 * To avoid any stray glitches while abruptly powering down the PLL
460 * make sure to gate the clock using the clock enable bit before
461 * powering down the PLL
462 */
463 dsi_pll_disable_global_clk(pll_10nm);
464 pll_write(pll_10nm->phy_cmn_mmio + REG_DSI_10nm_PHY_CMN_PLL_CNTRL, 0);
465 dsi_pll_disable_sub(pll_10nm);
466 if (pll_10nm->slave) {
467 dsi_pll_disable_global_clk(pll_10nm->slave);
468 dsi_pll_disable_sub(pll_10nm->slave);
469 }
470 /* flush, ensure all register writes are done */
471 wmb();
472 pll->pll_on = false;
473 }
474
dsi_pll_10nm_vco_recalc_rate(struct clk_hw * hw,unsigned long parent_rate)475 static unsigned long dsi_pll_10nm_vco_recalc_rate(struct clk_hw *hw,
476 unsigned long parent_rate)
477 {
478 struct msm_dsi_pll *pll = hw_clk_to_pll(hw);
479 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
480 void __iomem *base = pll_10nm->mmio;
481 u64 ref_clk = pll_10nm->vco_ref_clk_rate;
482 u64 vco_rate = 0x0;
483 u64 multiplier;
484 u32 frac;
485 u32 dec;
486 u64 pll_freq, tmp64;
487
488 dec = pll_read(base + REG_DSI_10nm_PHY_PLL_DECIMAL_DIV_START_1);
489 dec &= 0xff;
490
491 frac = pll_read(base + REG_DSI_10nm_PHY_PLL_FRAC_DIV_START_LOW_1);
492 frac |= ((pll_read(base + REG_DSI_10nm_PHY_PLL_FRAC_DIV_START_MID_1) &
493 0xff) << 8);
494 frac |= ((pll_read(base + REG_DSI_10nm_PHY_PLL_FRAC_DIV_START_HIGH_1) &
495 0x3) << 16);
496
497 /*
498 * TODO:
499 * 1. Assumes prescaler is disabled
500 * 2. Multiplier is 2^18. it should be 2^(num_of_frac_bits)
501 */
502 multiplier = 1 << 18;
503 pll_freq = dec * (ref_clk * 2);
504 tmp64 = (ref_clk * 2 * frac);
505 pll_freq += div_u64(tmp64, multiplier);
506
507 vco_rate = pll_freq;
508
509 DBG("DSI PLL%d returning vco rate = %lu, dec = %x, frac = %x",
510 pll_10nm->id, (unsigned long)vco_rate, dec, frac);
511
512 return (unsigned long)vco_rate;
513 }
514
515 static const struct clk_ops clk_ops_dsi_pll_10nm_vco = {
516 .round_rate = msm_dsi_pll_helper_clk_round_rate,
517 .set_rate = dsi_pll_10nm_vco_set_rate,
518 .recalc_rate = dsi_pll_10nm_vco_recalc_rate,
519 .prepare = dsi_pll_10nm_vco_prepare,
520 .unprepare = dsi_pll_10nm_vco_unprepare,
521 };
522
523 /*
524 * PLL Callbacks
525 */
526
dsi_pll_10nm_save_state(struct msm_dsi_pll * pll)527 static void dsi_pll_10nm_save_state(struct msm_dsi_pll *pll)
528 {
529 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
530 struct pll_10nm_cached_state *cached = &pll_10nm->cached_state;
531 void __iomem *phy_base = pll_10nm->phy_cmn_mmio;
532 u32 cmn_clk_cfg0, cmn_clk_cfg1;
533
534 cached->pll_out_div = pll_read(pll_10nm->mmio +
535 REG_DSI_10nm_PHY_PLL_PLL_OUTDIV_RATE);
536 cached->pll_out_div &= 0x3;
537
538 cmn_clk_cfg0 = pll_read(phy_base + REG_DSI_10nm_PHY_CMN_CLK_CFG0);
539 cached->bit_clk_div = cmn_clk_cfg0 & 0xf;
540 cached->pix_clk_div = (cmn_clk_cfg0 & 0xf0) >> 4;
541
542 cmn_clk_cfg1 = pll_read(phy_base + REG_DSI_10nm_PHY_CMN_CLK_CFG1);
543 cached->pll_mux = cmn_clk_cfg1 & 0x3;
544
545 DBG("DSI PLL%d outdiv %x bit_clk_div %x pix_clk_div %x pll_mux %x",
546 pll_10nm->id, cached->pll_out_div, cached->bit_clk_div,
547 cached->pix_clk_div, cached->pll_mux);
548 }
549
dsi_pll_10nm_restore_state(struct msm_dsi_pll * pll)550 static int dsi_pll_10nm_restore_state(struct msm_dsi_pll *pll)
551 {
552 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
553 struct pll_10nm_cached_state *cached = &pll_10nm->cached_state;
554 void __iomem *phy_base = pll_10nm->phy_cmn_mmio;
555 u32 val;
556
557 val = pll_read(pll_10nm->mmio + REG_DSI_10nm_PHY_PLL_PLL_OUTDIV_RATE);
558 val &= ~0x3;
559 val |= cached->pll_out_div;
560 pll_write(pll_10nm->mmio + REG_DSI_10nm_PHY_PLL_PLL_OUTDIV_RATE, val);
561
562 pll_write(phy_base + REG_DSI_10nm_PHY_CMN_CLK_CFG0,
563 cached->bit_clk_div | (cached->pix_clk_div << 4));
564
565 val = pll_read(phy_base + REG_DSI_10nm_PHY_CMN_CLK_CFG1);
566 val &= ~0x3;
567 val |= cached->pll_mux;
568 pll_write(phy_base + REG_DSI_10nm_PHY_CMN_CLK_CFG1, val);
569
570 DBG("DSI PLL%d", pll_10nm->id);
571
572 return 0;
573 }
574
dsi_pll_10nm_set_usecase(struct msm_dsi_pll * pll,enum msm_dsi_phy_usecase uc)575 static int dsi_pll_10nm_set_usecase(struct msm_dsi_pll *pll,
576 enum msm_dsi_phy_usecase uc)
577 {
578 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
579 void __iomem *base = pll_10nm->phy_cmn_mmio;
580 u32 data = 0x0; /* internal PLL */
581
582 DBG("DSI PLL%d", pll_10nm->id);
583
584 switch (uc) {
585 case MSM_DSI_PHY_STANDALONE:
586 break;
587 case MSM_DSI_PHY_MASTER:
588 pll_10nm->slave = pll_10nm_list[(pll_10nm->id + 1) % DSI_MAX];
589 break;
590 case MSM_DSI_PHY_SLAVE:
591 data = 0x1; /* external PLL */
592 break;
593 default:
594 return -EINVAL;
595 }
596
597 /* set PLL src */
598 pll_write(base + REG_DSI_10nm_PHY_CMN_CLK_CFG1, (data << 2));
599
600 pll_10nm->uc = uc;
601
602 return 0;
603 }
604
dsi_pll_10nm_get_provider(struct msm_dsi_pll * pll,struct clk ** byte_clk_provider,struct clk ** pixel_clk_provider)605 static int dsi_pll_10nm_get_provider(struct msm_dsi_pll *pll,
606 struct clk **byte_clk_provider,
607 struct clk **pixel_clk_provider)
608 {
609 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
610 struct clk_hw_onecell_data *hw_data = pll_10nm->hw_data;
611
612 DBG("DSI PLL%d", pll_10nm->id);
613
614 if (byte_clk_provider)
615 *byte_clk_provider = hw_data->hws[DSI_BYTE_PLL_CLK]->clk;
616 if (pixel_clk_provider)
617 *pixel_clk_provider = hw_data->hws[DSI_PIXEL_PLL_CLK]->clk;
618
619 return 0;
620 }
621
dsi_pll_10nm_destroy(struct msm_dsi_pll * pll)622 static void dsi_pll_10nm_destroy(struct msm_dsi_pll *pll)
623 {
624 struct dsi_pll_10nm *pll_10nm = to_pll_10nm(pll);
625 struct device *dev = &pll_10nm->pdev->dev;
626
627 DBG("DSI PLL%d", pll_10nm->id);
628 of_clk_del_provider(dev->of_node);
629
630 clk_hw_unregister_divider(pll_10nm->out_dsiclk_hw);
631 clk_hw_unregister_mux(pll_10nm->pclk_mux_hw);
632 clk_hw_unregister_fixed_factor(pll_10nm->post_out_div_clk_hw);
633 clk_hw_unregister_fixed_factor(pll_10nm->by_2_bit_clk_hw);
634 clk_hw_unregister_fixed_factor(pll_10nm->byte_clk_hw);
635 clk_hw_unregister_divider(pll_10nm->bit_clk_hw);
636 clk_hw_unregister_divider(pll_10nm->out_div_clk_hw);
637 clk_hw_unregister(&pll_10nm->base.clk_hw);
638 }
639
640 /*
641 * The post dividers and mux clocks are created using the standard divider and
642 * mux API. Unlike the 14nm PHY, the slave PLL doesn't need its dividers/mux
643 * state to follow the master PLL's divider/mux state. Therefore, we don't
644 * require special clock ops that also configure the slave PLL registers
645 */
pll_10nm_register(struct dsi_pll_10nm * pll_10nm)646 static int pll_10nm_register(struct dsi_pll_10nm *pll_10nm)
647 {
648 char clk_name[32], parent[32], vco_name[32];
649 char parent2[32], parent3[32], parent4[32];
650 struct clk_init_data vco_init = {
651 .parent_names = (const char *[]){ "xo" },
652 .num_parents = 1,
653 .name = vco_name,
654 .flags = CLK_IGNORE_UNUSED,
655 .ops = &clk_ops_dsi_pll_10nm_vco,
656 };
657 struct device *dev = &pll_10nm->pdev->dev;
658 struct clk_hw_onecell_data *hw_data;
659 struct clk_hw *hw;
660 int ret;
661
662 DBG("DSI%d", pll_10nm->id);
663
664 hw_data = devm_kzalloc(dev, sizeof(*hw_data) +
665 NUM_PROVIDED_CLKS * sizeof(struct clk_hw *),
666 GFP_KERNEL);
667 if (!hw_data)
668 return -ENOMEM;
669
670 snprintf(vco_name, 32, "dsi%dvco_clk", pll_10nm->id);
671 pll_10nm->base.clk_hw.init = &vco_init;
672
673 ret = clk_hw_register(dev, &pll_10nm->base.clk_hw);
674 if (ret)
675 return ret;
676
677 snprintf(clk_name, 32, "dsi%d_pll_out_div_clk", pll_10nm->id);
678 snprintf(parent, 32, "dsi%dvco_clk", pll_10nm->id);
679
680 hw = clk_hw_register_divider(dev, clk_name,
681 parent, CLK_SET_RATE_PARENT,
682 pll_10nm->mmio +
683 REG_DSI_10nm_PHY_PLL_PLL_OUTDIV_RATE,
684 0, 2, CLK_DIVIDER_POWER_OF_TWO, NULL);
685 if (IS_ERR(hw)) {
686 ret = PTR_ERR(hw);
687 goto err_base_clk_hw;
688 }
689
690 pll_10nm->out_div_clk_hw = hw;
691
692 snprintf(clk_name, 32, "dsi%d_pll_bit_clk", pll_10nm->id);
693 snprintf(parent, 32, "dsi%d_pll_out_div_clk", pll_10nm->id);
694
695 /* BIT CLK: DIV_CTRL_3_0 */
696 hw = clk_hw_register_divider(dev, clk_name, parent,
697 CLK_SET_RATE_PARENT,
698 pll_10nm->phy_cmn_mmio +
699 REG_DSI_10nm_PHY_CMN_CLK_CFG0,
700 0, 4, CLK_DIVIDER_ONE_BASED,
701 &pll_10nm->postdiv_lock);
702 if (IS_ERR(hw)) {
703 ret = PTR_ERR(hw);
704 goto err_out_div_clk_hw;
705 }
706
707 pll_10nm->bit_clk_hw = hw;
708
709 snprintf(clk_name, 32, "dsi%d_phy_pll_out_byteclk", pll_10nm->id);
710 snprintf(parent, 32, "dsi%d_pll_bit_clk", pll_10nm->id);
711
712 /* DSI Byte clock = VCO_CLK / OUT_DIV / BIT_DIV / 8 */
713 hw = clk_hw_register_fixed_factor(dev, clk_name, parent,
714 CLK_SET_RATE_PARENT, 1, 8);
715 if (IS_ERR(hw)) {
716 ret = PTR_ERR(hw);
717 goto err_bit_clk_hw;
718 }
719
720 pll_10nm->byte_clk_hw = hw;
721 hw_data->hws[DSI_BYTE_PLL_CLK] = hw;
722
723 snprintf(clk_name, 32, "dsi%d_pll_by_2_bit_clk", pll_10nm->id);
724 snprintf(parent, 32, "dsi%d_pll_bit_clk", pll_10nm->id);
725
726 hw = clk_hw_register_fixed_factor(dev, clk_name, parent,
727 0, 1, 2);
728 if (IS_ERR(hw)) {
729 ret = PTR_ERR(hw);
730 goto err_byte_clk_hw;
731 }
732
733 pll_10nm->by_2_bit_clk_hw = hw;
734
735 snprintf(clk_name, 32, "dsi%d_pll_post_out_div_clk", pll_10nm->id);
736 snprintf(parent, 32, "dsi%d_pll_out_div_clk", pll_10nm->id);
737
738 hw = clk_hw_register_fixed_factor(dev, clk_name, parent,
739 0, 1, 4);
740 if (IS_ERR(hw)) {
741 ret = PTR_ERR(hw);
742 goto err_by_2_bit_clk_hw;
743 }
744
745 pll_10nm->post_out_div_clk_hw = hw;
746
747 snprintf(clk_name, 32, "dsi%d_pclk_mux", pll_10nm->id);
748 snprintf(parent, 32, "dsi%d_pll_bit_clk", pll_10nm->id);
749 snprintf(parent2, 32, "dsi%d_pll_by_2_bit_clk", pll_10nm->id);
750 snprintf(parent3, 32, "dsi%d_pll_out_div_clk", pll_10nm->id);
751 snprintf(parent4, 32, "dsi%d_pll_post_out_div_clk", pll_10nm->id);
752
753 hw = clk_hw_register_mux(dev, clk_name,
754 (const char *[]){
755 parent, parent2, parent3, parent4
756 }, 4, 0, pll_10nm->phy_cmn_mmio +
757 REG_DSI_10nm_PHY_CMN_CLK_CFG1,
758 0, 2, 0, NULL);
759 if (IS_ERR(hw)) {
760 ret = PTR_ERR(hw);
761 goto err_post_out_div_clk_hw;
762 }
763
764 pll_10nm->pclk_mux_hw = hw;
765
766 snprintf(clk_name, 32, "dsi%d_phy_pll_out_dsiclk", pll_10nm->id);
767 snprintf(parent, 32, "dsi%d_pclk_mux", pll_10nm->id);
768
769 /* PIX CLK DIV : DIV_CTRL_7_4*/
770 hw = clk_hw_register_divider(dev, clk_name, parent,
771 0, pll_10nm->phy_cmn_mmio +
772 REG_DSI_10nm_PHY_CMN_CLK_CFG0,
773 4, 4, CLK_DIVIDER_ONE_BASED,
774 &pll_10nm->postdiv_lock);
775 if (IS_ERR(hw)) {
776 ret = PTR_ERR(hw);
777 goto err_pclk_mux_hw;
778 }
779
780 pll_10nm->out_dsiclk_hw = hw;
781 hw_data->hws[DSI_PIXEL_PLL_CLK] = hw;
782
783 hw_data->num = NUM_PROVIDED_CLKS;
784 pll_10nm->hw_data = hw_data;
785
786 ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
787 pll_10nm->hw_data);
788 if (ret) {
789 DRM_DEV_ERROR(dev, "failed to register clk provider: %d\n", ret);
790 goto err_dsiclk_hw;
791 }
792
793 return 0;
794
795 err_dsiclk_hw:
796 clk_hw_unregister_divider(pll_10nm->out_dsiclk_hw);
797 err_pclk_mux_hw:
798 clk_hw_unregister_mux(pll_10nm->pclk_mux_hw);
799 err_post_out_div_clk_hw:
800 clk_hw_unregister_fixed_factor(pll_10nm->post_out_div_clk_hw);
801 err_by_2_bit_clk_hw:
802 clk_hw_unregister_fixed_factor(pll_10nm->by_2_bit_clk_hw);
803 err_byte_clk_hw:
804 clk_hw_unregister_fixed_factor(pll_10nm->byte_clk_hw);
805 err_bit_clk_hw:
806 clk_hw_unregister_divider(pll_10nm->bit_clk_hw);
807 err_out_div_clk_hw:
808 clk_hw_unregister_divider(pll_10nm->out_div_clk_hw);
809 err_base_clk_hw:
810 clk_hw_unregister(&pll_10nm->base.clk_hw);
811
812 return ret;
813 }
814
msm_dsi_pll_10nm_init(struct platform_device * pdev,int id)815 struct msm_dsi_pll *msm_dsi_pll_10nm_init(struct platform_device *pdev, int id)
816 {
817 struct dsi_pll_10nm *pll_10nm;
818 struct msm_dsi_pll *pll;
819 int ret;
820
821 pll_10nm = devm_kzalloc(&pdev->dev, sizeof(*pll_10nm), GFP_KERNEL);
822 if (!pll_10nm)
823 return ERR_PTR(-ENOMEM);
824
825 DBG("DSI PLL%d", id);
826
827 pll_10nm->pdev = pdev;
828 pll_10nm->id = id;
829 pll_10nm_list[id] = pll_10nm;
830
831 pll_10nm->phy_cmn_mmio = msm_ioremap(pdev, "dsi_phy", "DSI_PHY");
832 if (IS_ERR_OR_NULL(pll_10nm->phy_cmn_mmio)) {
833 DRM_DEV_ERROR(&pdev->dev, "failed to map CMN PHY base\n");
834 return ERR_PTR(-ENOMEM);
835 }
836
837 pll_10nm->mmio = msm_ioremap(pdev, "dsi_pll", "DSI_PLL");
838 if (IS_ERR_OR_NULL(pll_10nm->mmio)) {
839 DRM_DEV_ERROR(&pdev->dev, "failed to map PLL base\n");
840 return ERR_PTR(-ENOMEM);
841 }
842
843 spin_lock_init(&pll_10nm->postdiv_lock);
844
845 pll = &pll_10nm->base;
846 pll->min_rate = 1000000000UL;
847 pll->max_rate = 3500000000UL;
848 pll->get_provider = dsi_pll_10nm_get_provider;
849 pll->destroy = dsi_pll_10nm_destroy;
850 pll->save_state = dsi_pll_10nm_save_state;
851 pll->restore_state = dsi_pll_10nm_restore_state;
852 pll->set_usecase = dsi_pll_10nm_set_usecase;
853
854 pll_10nm->vco_delay = 1;
855
856 ret = pll_10nm_register(pll_10nm);
857 if (ret) {
858 DRM_DEV_ERROR(&pdev->dev, "failed to register PLL: %d\n", ret);
859 return ERR_PTR(ret);
860 }
861
862 /* TODO: Remove this when we have proper display handover support */
863 msm_dsi_pll_save_state(pll);
864
865 return pll;
866 }
867
