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1/*
2 * OMAP3 Clock init
3 *
4 * Copyright (C) 2013 Texas Instruments, Inc
5 * Tero Kristo (t-kristo@ti.com)
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation version 2.
10 *
11 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
12 * kind, whether express or implied; without even the implied warranty
13 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/kernel.h>
18#include <linux/list.h>
19#include <linux/clk.h>
20#include <linux/clk-provider.h>
21#include <linux/clk/ti.h>
22
23#include "clock.h"
24
25#define OMAP3430ES2_ST_DSS_IDLE_SHIFT 1
26#define OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT 5
27#define OMAP3430ES2_ST_SSI_IDLE_SHIFT 8
28
29#define OMAP34XX_CM_IDLEST_VAL 1
30
31/*
32 * In AM35xx IPSS, the {ICK,FCK} enable bits for modules are exported
33 * in the same register at a bit offset of 0x8. The EN_ACK for ICK is
34 * at an offset of 4 from ICK enable bit.
35 */
36#define AM35XX_IPSS_ICK_MASK 0xF
37#define AM35XX_IPSS_ICK_EN_ACK_OFFSET 0x4
38#define AM35XX_IPSS_ICK_FCK_OFFSET 0x8
39#define AM35XX_IPSS_CLK_IDLEST_VAL 0
40
41#define AM35XX_ST_IPSS_SHIFT 5
42
43/**
44 * omap3430es2_clk_ssi_find_idlest - return CM_IDLEST info for SSI
45 * @clk: struct clk * being enabled
46 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
47 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
48 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
49 *
50 * The OMAP3430ES2 SSI target CM_IDLEST bit is at a different shift
51 * from the CM_{I,F}CLKEN bit. Pass back the correct info via
52 * @idlest_reg and @idlest_bit. No return value.
53 */
54static void omap3430es2_clk_ssi_find_idlest(struct clk_hw_omap *clk,
55 struct clk_omap_reg *idlest_reg,
56 u8 *idlest_bit,
57 u8 *idlest_val)
58{
59 memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
60 idlest_reg->offset &= ~0xf0;
61 idlest_reg->offset |= 0x20;
62 *idlest_bit = OMAP3430ES2_ST_SSI_IDLE_SHIFT;
63 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
64}
65
66const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_ssi_wait = {
67 .allow_idle = omap2_clkt_iclk_allow_idle,
68 .deny_idle = omap2_clkt_iclk_deny_idle,
69 .find_idlest = omap3430es2_clk_ssi_find_idlest,
70 .find_companion = omap2_clk_dflt_find_companion,
71};
72
73/**
74 * omap3430es2_clk_dss_usbhost_find_idlest - CM_IDLEST info for DSS, USBHOST
75 * @clk: struct clk * being enabled
76 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
77 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
78 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
79 *
80 * Some OMAP modules on OMAP3 ES2+ chips have both initiator and
81 * target IDLEST bits. For our purposes, we are concerned with the
82 * target IDLEST bits, which exist at a different bit position than
83 * the *CLKEN bit position for these modules (DSS and USBHOST) (The
84 * default find_idlest code assumes that they are at the same
85 * position.) No return value.
86 */
87static void
88omap3430es2_clk_dss_usbhost_find_idlest(struct clk_hw_omap *clk,
89 struct clk_omap_reg *idlest_reg,
90 u8 *idlest_bit, u8 *idlest_val)
91{
92 memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
93
94 idlest_reg->offset &= ~0xf0;
95 idlest_reg->offset |= 0x20;
96 /* USBHOST_IDLE has same shift */
97 *idlest_bit = OMAP3430ES2_ST_DSS_IDLE_SHIFT;
98 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
99}
100
101const struct clk_hw_omap_ops clkhwops_omap3430es2_dss_usbhost_wait = {
102 .find_idlest = omap3430es2_clk_dss_usbhost_find_idlest,
103 .find_companion = omap2_clk_dflt_find_companion,
104};
105
106const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_dss_usbhost_wait = {
107 .allow_idle = omap2_clkt_iclk_allow_idle,
108 .deny_idle = omap2_clkt_iclk_deny_idle,
109 .find_idlest = omap3430es2_clk_dss_usbhost_find_idlest,
110 .find_companion = omap2_clk_dflt_find_companion,
111};
112
113/**
114 * omap3430es2_clk_hsotgusb_find_idlest - return CM_IDLEST info for HSOTGUSB
115 * @clk: struct clk * being enabled
116 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
117 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
118 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
119 *
120 * The OMAP3430ES2 HSOTGUSB target CM_IDLEST bit is at a different
121 * shift from the CM_{I,F}CLKEN bit. Pass back the correct info via
122 * @idlest_reg and @idlest_bit. No return value.
123 */
124static void
125omap3430es2_clk_hsotgusb_find_idlest(struct clk_hw_omap *clk,
126 struct clk_omap_reg *idlest_reg,
127 u8 *idlest_bit,
128 u8 *idlest_val)
129{
130 memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
131 idlest_reg->offset &= ~0xf0;
132 idlest_reg->offset |= 0x20;
133 *idlest_bit = OMAP3430ES2_ST_HSOTGUSB_IDLE_SHIFT;
134 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
135}
136
137const struct clk_hw_omap_ops clkhwops_omap3430es2_iclk_hsotgusb_wait = {
138 .allow_idle = omap2_clkt_iclk_allow_idle,
139 .deny_idle = omap2_clkt_iclk_deny_idle,
140 .find_idlest = omap3430es2_clk_hsotgusb_find_idlest,
141 .find_companion = omap2_clk_dflt_find_companion,
142};
143
144/**
145 * am35xx_clk_find_idlest - return clock ACK info for AM35XX IPSS
146 * @clk: struct clk * being enabled
147 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
148 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
149 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
150 *
151 * The interface clocks on AM35xx IPSS reflects the clock idle status
152 * in the enable register itsel at a bit offset of 4 from the enable
153 * bit. A value of 1 indicates that clock is enabled.
154 */
155static void am35xx_clk_find_idlest(struct clk_hw_omap *clk,
156 struct clk_omap_reg *idlest_reg,
157 u8 *idlest_bit,
158 u8 *idlest_val)
159{
160 memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
161 *idlest_bit = clk->enable_bit + AM35XX_IPSS_ICK_EN_ACK_OFFSET;
162 *idlest_val = AM35XX_IPSS_CLK_IDLEST_VAL;
163}
164
165/**
166 * am35xx_clk_find_companion - find companion clock to @clk
167 * @clk: struct clk * to find the companion clock of
168 * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in
169 * @other_bit: u8 ** to return the companion clock bit shift in
170 *
171 * Some clocks don't have companion clocks. For example, modules with
172 * only an interface clock (such as HECC) don't have a companion
173 * clock. Right now, this code relies on the hardware exporting a bit
174 * in the correct companion register that indicates that the
175 * nonexistent 'companion clock' is active. Future patches will
176 * associate this type of code with per-module data structures to
177 * avoid this issue, and remove the casts. No return value.
178 */
179static void am35xx_clk_find_companion(struct clk_hw_omap *clk,
180 struct clk_omap_reg *other_reg,
181 u8 *other_bit)
182{
183 memcpy(other_reg, &clk->enable_reg, sizeof(*other_reg));
184 if (clk->enable_bit & AM35XX_IPSS_ICK_MASK)
185 *other_bit = clk->enable_bit + AM35XX_IPSS_ICK_FCK_OFFSET;
186 else
187 *other_bit = clk->enable_bit - AM35XX_IPSS_ICK_FCK_OFFSET;
188}
189
190const struct clk_hw_omap_ops clkhwops_am35xx_ipss_module_wait = {
191 .find_idlest = am35xx_clk_find_idlest,
192 .find_companion = am35xx_clk_find_companion,
193};
194
195/**
196 * am35xx_clk_ipss_find_idlest - return CM_IDLEST info for IPSS
197 * @clk: struct clk * being enabled
198 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
199 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
200 * @idlest_val: pointer to a u8 to store the CM_IDLEST indicator
201 *
202 * The IPSS target CM_IDLEST bit is at a different shift from the
203 * CM_{I,F}CLKEN bit. Pass back the correct info via @idlest_reg
204 * and @idlest_bit. No return value.
205 */
206static void am35xx_clk_ipss_find_idlest(struct clk_hw_omap *clk,
207 struct clk_omap_reg *idlest_reg,
208 u8 *idlest_bit,
209 u8 *idlest_val)
210{
211 memcpy(idlest_reg, &clk->enable_reg, sizeof(*idlest_reg));
212
213 idlest_reg->offset &= ~0xf0;
214 idlest_reg->offset |= 0x20;
215 *idlest_bit = AM35XX_ST_IPSS_SHIFT;
216 *idlest_val = OMAP34XX_CM_IDLEST_VAL;
217}
218
219const struct clk_hw_omap_ops clkhwops_am35xx_ipss_wait = {
220 .allow_idle = omap2_clkt_iclk_allow_idle,
221 .deny_idle = omap2_clkt_iclk_deny_idle,
222 .find_idlest = am35xx_clk_ipss_find_idlest,
223 .find_companion = omap2_clk_dflt_find_companion,
224};
225
226static struct ti_dt_clk omap3xxx_clks[] = {
227 DT_CLK(NULL, "timer_32k_ck", "omap_32k_fck"),
228 DT_CLK(NULL, "timer_sys_ck", "sys_ck"),
229 { .node_name = NULL },
230};
231
232static struct ti_dt_clk omap36xx_omap3430es2plus_clks[] = {
233 DT_CLK(NULL, "ssi_ssr_fck", "ssi_ssr_fck_3430es2"),
234 DT_CLK(NULL, "ssi_sst_fck", "ssi_sst_fck_3430es2"),
235 DT_CLK(NULL, "hsotgusb_ick", "hsotgusb_ick_3430es2"),
236 DT_CLK(NULL, "ssi_ick", "ssi_ick_3430es2"),
237 { .node_name = NULL },
238};
239
240static struct ti_dt_clk omap3430es1_clks[] = {
241 DT_CLK(NULL, "ssi_ssr_fck", "ssi_ssr_fck_3430es1"),
242 DT_CLK(NULL, "ssi_sst_fck", "ssi_sst_fck_3430es1"),
243 DT_CLK(NULL, "hsotgusb_ick", "hsotgusb_ick_3430es1"),
244 DT_CLK(NULL, "ssi_ick", "ssi_ick_3430es1"),
245 DT_CLK(NULL, "dss1_alwon_fck", "dss1_alwon_fck_3430es1"),
246 DT_CLK(NULL, "dss_ick", "dss_ick_3430es1"),
247 { .node_name = NULL },
248};
249
250static struct ti_dt_clk omap36xx_am35xx_omap3430es2plus_clks[] = {
251 DT_CLK(NULL, "dss1_alwon_fck", "dss1_alwon_fck_3430es2"),
252 DT_CLK(NULL, "dss_ick", "dss_ick_3430es2"),
253 { .node_name = NULL },
254};
255
256static struct ti_dt_clk am35xx_clks[] = {
257 DT_CLK(NULL, "hsotgusb_ick", "hsotgusb_ick_am35xx"),
258 DT_CLK(NULL, "hsotgusb_fck", "hsotgusb_fck_am35xx"),
259 DT_CLK(NULL, "uart4_ick", "uart4_ick_am35xx"),
260 DT_CLK(NULL, "uart4_fck", "uart4_fck_am35xx"),
261 { .node_name = NULL },
262};
263
264static const char *enable_init_clks[] = {
265 "sdrc_ick",
266 "gpmc_fck",
267 "omapctrl_ick",
268};
269
270enum {
271 OMAP3_SOC_AM35XX,
272 OMAP3_SOC_OMAP3430_ES1,
273 OMAP3_SOC_OMAP3430_ES2_PLUS,
274 OMAP3_SOC_OMAP3630,
275};
276
277/**
278 * omap3_clk_lock_dpll5 - locks DPLL5
279 *
280 * Locks DPLL5 to a pre-defined frequency. This is required for proper
281 * operation of USB.
282 */
283void __init omap3_clk_lock_dpll5(void)
284{
285 struct clk *dpll5_clk;
286 struct clk *dpll5_m2_clk;
287
288 /*
289 * Errata sprz319f advisory 2.1 documents a USB host clock drift issue
290 * that can be worked around using specially crafted dpll5 settings
291 * with a dpll5_m2 divider set to 8. Set the dpll5 rate to 8x the USB
292 * host clock rate, its .set_rate handler() will detect that frequency
293 * and use the errata settings.
294 */
295 dpll5_clk = clk_get(NULL, "dpll5_ck");
296 clk_set_rate(dpll5_clk, OMAP3_DPLL5_FREQ_FOR_USBHOST * 8);
297 clk_prepare_enable(dpll5_clk);
298
299 /* Program dpll5_m2_clk divider */
300 dpll5_m2_clk = clk_get(NULL, "dpll5_m2_ck");
301 clk_prepare_enable(dpll5_m2_clk);
302 clk_set_rate(dpll5_m2_clk, OMAP3_DPLL5_FREQ_FOR_USBHOST);
303
304 clk_disable_unprepare(dpll5_m2_clk);
305 clk_disable_unprepare(dpll5_clk);
306}
307
308static int __init omap3xxx_dt_clk_init(int soc_type)
309{
310 if (soc_type == OMAP3_SOC_AM35XX || soc_type == OMAP3_SOC_OMAP3630 ||
311 soc_type == OMAP3_SOC_OMAP3430_ES1 ||
312 soc_type == OMAP3_SOC_OMAP3430_ES2_PLUS)
313 ti_dt_clocks_register(omap3xxx_clks);
314
315 if (soc_type == OMAP3_SOC_AM35XX)
316 ti_dt_clocks_register(am35xx_clks);
317
318 if (soc_type == OMAP3_SOC_OMAP3630 || soc_type == OMAP3_SOC_AM35XX ||
319 soc_type == OMAP3_SOC_OMAP3430_ES2_PLUS)
320 ti_dt_clocks_register(omap36xx_am35xx_omap3430es2plus_clks);
321
322 if (soc_type == OMAP3_SOC_OMAP3430_ES1)
323 ti_dt_clocks_register(omap3430es1_clks);
324
325 if (soc_type == OMAP3_SOC_OMAP3430_ES2_PLUS ||
326 soc_type == OMAP3_SOC_OMAP3630)
327 ti_dt_clocks_register(omap36xx_omap3430es2plus_clks);
328
329 omap2_clk_disable_autoidle_all();
330
331 ti_clk_add_aliases();
332
333 omap2_clk_enable_init_clocks(enable_init_clks,
334 ARRAY_SIZE(enable_init_clks));
335
336 pr_info("Clocking rate (Crystal/Core/MPU): %ld.%01ld/%ld/%ld MHz\n",
337 (clk_get_rate(clk_get_sys(NULL, "osc_sys_ck")) / 1000000),
338 (clk_get_rate(clk_get_sys(NULL, "osc_sys_ck")) / 100000) % 10,
339 (clk_get_rate(clk_get_sys(NULL, "core_ck")) / 1000000),
340 (clk_get_rate(clk_get_sys(NULL, "arm_fck")) / 1000000));
341
342 if (soc_type != OMAP3_SOC_OMAP3430_ES1)
343 omap3_clk_lock_dpll5();
344
345 return 0;
346}
347
348int __init omap3430_dt_clk_init(void)
349{
350 return omap3xxx_dt_clk_init(OMAP3_SOC_OMAP3430_ES2_PLUS);
351}
352
353int __init omap3630_dt_clk_init(void)
354{
355 return omap3xxx_dt_clk_init(OMAP3_SOC_OMAP3630);
356}
357
358int __init am35xx_dt_clk_init(void)
359{
360 return omap3xxx_dt_clk_init(OMAP3_SOC_AM35XX);
361}