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f60b1ea5 TK |
1 | /* |
2 | * OMAP gate clock support | |
3 | * | |
4 | * Copyright (C) 2013 Texas Instruments, Inc. | |
5 | * | |
6 | * Tero Kristo <t-kristo@ti.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed "as is" WITHOUT ANY WARRANTY of any | |
13 | * kind, whether express or implied; without even the implied warranty | |
14 | * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | * GNU General Public License for more details. | |
16 | */ | |
17 | ||
18 | #include <linux/clk-provider.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/io.h> | |
21 | #include <linux/of.h> | |
22 | #include <linux/of_address.h> | |
23 | #include <linux/clk/ti.h> | |
24 | ||
f187616b TK |
25 | #include "clock.h" |
26 | ||
f60b1ea5 TK |
27 | #undef pr_fmt |
28 | #define pr_fmt(fmt) "%s: " fmt, __func__ | |
29 | ||
30 | static int omap36xx_gate_clk_enable_with_hsdiv_restore(struct clk_hw *clk); | |
31 | ||
32 | static const struct clk_ops omap_gate_clkdm_clk_ops = { | |
33 | .init = &omap2_init_clk_clkdm, | |
34 | .enable = &omap2_clkops_enable_clkdm, | |
35 | .disable = &omap2_clkops_disable_clkdm, | |
36 | }; | |
37 | ||
9a00fa68 | 38 | const struct clk_ops omap_gate_clk_ops = { |
f60b1ea5 TK |
39 | .init = &omap2_init_clk_clkdm, |
40 | .enable = &omap2_dflt_clk_enable, | |
41 | .disable = &omap2_dflt_clk_disable, | |
42 | .is_enabled = &omap2_dflt_clk_is_enabled, | |
43 | }; | |
44 | ||
45 | static const struct clk_ops omap_gate_clk_hsdiv_restore_ops = { | |
46 | .init = &omap2_init_clk_clkdm, | |
47 | .enable = &omap36xx_gate_clk_enable_with_hsdiv_restore, | |
48 | .disable = &omap2_dflt_clk_disable, | |
49 | .is_enabled = &omap2_dflt_clk_is_enabled, | |
50 | }; | |
51 | ||
52 | /** | |
53 | * omap36xx_gate_clk_enable_with_hsdiv_restore - enable clocks suffering | |
54 | * from HSDivider PWRDN problem Implements Errata ID: i556. | |
55 | * @clk: DPLL output struct clk | |
56 | * | |
57 | * 3630 only: dpll3_m3_ck, dpll4_m2_ck, dpll4_m3_ck, dpll4_m4_ck, | |
58 | * dpll4_m5_ck & dpll4_m6_ck dividers gets loaded with reset | |
59 | * valueafter their respective PWRDN bits are set. Any dummy write | |
60 | * (Any other value different from the Read value) to the | |
61 | * corresponding CM_CLKSEL register will refresh the dividers. | |
62 | */ | |
a53ad8ef | 63 | static int omap36xx_gate_clk_enable_with_hsdiv_restore(struct clk_hw *hw) |
f60b1ea5 | 64 | { |
6dbde947 | 65 | struct clk_omap_divider *parent; |
f60b1ea5 TK |
66 | struct clk_hw *parent_hw; |
67 | u32 dummy_v, orig_v; | |
68 | int ret; | |
69 | ||
70 | /* Clear PWRDN bit of HSDIVIDER */ | |
a53ad8ef | 71 | ret = omap2_dflt_clk_enable(hw); |
f60b1ea5 TK |
72 | |
73 | /* Parent is the x2 node, get parent of parent for the m2 div */ | |
a53ad8ef | 74 | parent_hw = clk_hw_get_parent(clk_hw_get_parent(hw)); |
6dbde947 | 75 | parent = to_clk_omap_divider(parent_hw); |
f60b1ea5 TK |
76 | |
77 | /* Restore the dividers */ | |
78 | if (!ret) { | |
79 | orig_v = ti_clk_ll_ops->clk_readl(parent->reg); | |
80 | dummy_v = orig_v; | |
81 | ||
82 | /* Write any other value different from the Read value */ | |
83 | dummy_v ^= (1 << parent->shift); | |
84 | ti_clk_ll_ops->clk_writel(dummy_v, parent->reg); | |
85 | ||
86 | /* Write the original divider */ | |
87 | ti_clk_ll_ops->clk_writel(orig_v, parent->reg); | |
88 | } | |
89 | ||
90 | return ret; | |
91 | } | |
92 | ||
f187616b TK |
93 | static struct clk *_register_gate(struct device *dev, const char *name, |
94 | const char *parent_name, unsigned long flags, | |
95 | void __iomem *reg, u8 bit_idx, | |
96 | u8 clk_gate_flags, const struct clk_ops *ops, | |
97 | const struct clk_hw_omap_ops *hw_ops) | |
f60b1ea5 | 98 | { |
f60b1ea5 TK |
99 | struct clk_init_data init = { NULL }; |
100 | struct clk_hw_omap *clk_hw; | |
f187616b | 101 | struct clk *clk; |
f60b1ea5 TK |
102 | |
103 | clk_hw = kzalloc(sizeof(*clk_hw), GFP_KERNEL); | |
104 | if (!clk_hw) | |
f187616b | 105 | return ERR_PTR(-ENOMEM); |
f60b1ea5 TK |
106 | |
107 | clk_hw->hw.init = &init; | |
108 | ||
f187616b | 109 | init.name = name; |
f60b1ea5 TK |
110 | init.ops = ops; |
111 | ||
f187616b TK |
112 | clk_hw->enable_reg = reg; |
113 | clk_hw->enable_bit = bit_idx; | |
114 | clk_hw->ops = hw_ops; | |
f60b1ea5 | 115 | |
c91f0780 | 116 | clk_hw->flags = clk_gate_flags; |
f187616b TK |
117 | |
118 | init.parent_names = &parent_name; | |
119 | init.num_parents = 1; | |
120 | ||
121 | init.flags = flags; | |
122 | ||
1ae79c46 | 123 | clk = ti_clk_register(NULL, &clk_hw->hw, name); |
f187616b TK |
124 | |
125 | if (IS_ERR(clk)) | |
126 | kfree(clk_hw); | |
127 | ||
128 | return clk; | |
129 | } | |
130 | ||
6793a30a | 131 | #if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS) |
f187616b TK |
132 | struct clk *ti_clk_register_gate(struct ti_clk *setup) |
133 | { | |
134 | const struct clk_ops *ops = &omap_gate_clk_ops; | |
135 | const struct clk_hw_omap_ops *hw_ops = NULL; | |
136 | u32 reg; | |
137 | struct clk_omap_reg *reg_setup; | |
138 | u32 flags = 0; | |
139 | u8 clk_gate_flags = 0; | |
140 | struct ti_clk_gate *gate; | |
141 | ||
142 | gate = setup->data; | |
143 | ||
06524fa4 TK |
144 | if (gate->flags & CLKF_INTERFACE) |
145 | return ti_clk_register_interface(setup); | |
146 | ||
f187616b TK |
147 | reg_setup = (struct clk_omap_reg *)® |
148 | ||
149 | if (gate->flags & CLKF_SET_RATE_PARENT) | |
150 | flags |= CLK_SET_RATE_PARENT; | |
151 | ||
152 | if (gate->flags & CLKF_SET_BIT_TO_DISABLE) | |
153 | clk_gate_flags |= INVERT_ENABLE; | |
154 | ||
155 | if (gate->flags & CLKF_HSDIV) { | |
156 | ops = &omap_gate_clk_hsdiv_restore_ops; | |
157 | hw_ops = &clkhwops_wait; | |
f60b1ea5 TK |
158 | } |
159 | ||
f187616b TK |
160 | if (gate->flags & CLKF_DSS) |
161 | hw_ops = &clkhwops_omap3430es2_dss_usbhost_wait; | |
162 | ||
163 | if (gate->flags & CLKF_WAIT) | |
164 | hw_ops = &clkhwops_wait; | |
165 | ||
166 | if (gate->flags & CLKF_CLKDM) | |
167 | ops = &omap_gate_clkdm_clk_ops; | |
168 | ||
169 | if (gate->flags & CLKF_AM35XX) | |
170 | hw_ops = &clkhwops_am35xx_ipss_module_wait; | |
f60b1ea5 | 171 | |
f187616b TK |
172 | reg_setup->index = gate->module; |
173 | reg_setup->offset = gate->reg; | |
174 | ||
175 | return _register_gate(NULL, setup->name, gate->parent, flags, | |
176 | (void __iomem *)reg, gate->bit_shift, | |
177 | clk_gate_flags, ops, hw_ops); | |
178 | } | |
179 | ||
180 | struct clk_hw *ti_clk_build_component_gate(struct ti_clk_gate *setup) | |
181 | { | |
182 | struct clk_hw_omap *gate; | |
183 | struct clk_omap_reg *reg; | |
184 | const struct clk_hw_omap_ops *ops = &clkhwops_wait; | |
185 | ||
186 | if (!setup) | |
187 | return NULL; | |
188 | ||
189 | gate = kzalloc(sizeof(*gate), GFP_KERNEL); | |
190 | if (!gate) | |
191 | return ERR_PTR(-ENOMEM); | |
192 | ||
193 | reg = (struct clk_omap_reg *)&gate->enable_reg; | |
194 | reg->index = setup->module; | |
195 | reg->offset = setup->reg; | |
196 | ||
197 | gate->enable_bit = setup->bit_shift; | |
198 | ||
199 | if (setup->flags & CLKF_NO_WAIT) | |
200 | ops = NULL; | |
201 | ||
202 | if (setup->flags & CLKF_INTERFACE) | |
203 | ops = &clkhwops_iclk_wait; | |
204 | ||
205 | gate->ops = ops; | |
f187616b TK |
206 | |
207 | return &gate->hw; | |
208 | } | |
6793a30a | 209 | #endif |
f187616b TK |
210 | |
211 | static void __init _of_ti_gate_clk_setup(struct device_node *node, | |
212 | const struct clk_ops *ops, | |
213 | const struct clk_hw_omap_ops *hw_ops) | |
214 | { | |
215 | struct clk *clk; | |
216 | const char *parent_name; | |
217 | void __iomem *reg = NULL; | |
218 | u8 enable_bit = 0; | |
219 | u32 val; | |
220 | u32 flags = 0; | |
221 | u8 clk_gate_flags = 0; | |
222 | ||
223 | if (ops != &omap_gate_clkdm_clk_ops) { | |
224 | reg = ti_clk_get_reg_addr(node, 0); | |
c807dbed | 225 | if (IS_ERR(reg)) |
f187616b TK |
226 | return; |
227 | ||
228 | if (!of_property_read_u32(node, "ti,bit-shift", &val)) | |
229 | enable_bit = val; | |
230 | } | |
f60b1ea5 TK |
231 | |
232 | if (of_clk_get_parent_count(node) != 1) { | |
f187616b TK |
233 | pr_err("%s must have 1 parent\n", node->name); |
234 | return; | |
f60b1ea5 TK |
235 | } |
236 | ||
237 | parent_name = of_clk_get_parent_name(node, 0); | |
f60b1ea5 TK |
238 | |
239 | if (of_property_read_bool(node, "ti,set-rate-parent")) | |
f187616b | 240 | flags |= CLK_SET_RATE_PARENT; |
f60b1ea5 TK |
241 | |
242 | if (of_property_read_bool(node, "ti,set-bit-to-disable")) | |
f187616b | 243 | clk_gate_flags |= INVERT_ENABLE; |
f60b1ea5 | 244 | |
f187616b TK |
245 | clk = _register_gate(NULL, node->name, parent_name, flags, reg, |
246 | enable_bit, clk_gate_flags, ops, hw_ops); | |
f60b1ea5 | 247 | |
f187616b | 248 | if (!IS_ERR(clk)) |
f60b1ea5 | 249 | of_clk_add_provider(node, of_clk_src_simple_get, clk); |
f60b1ea5 TK |
250 | } |
251 | ||
252 | static void __init | |
253 | _of_ti_composite_gate_clk_setup(struct device_node *node, | |
254 | const struct clk_hw_omap_ops *hw_ops) | |
255 | { | |
256 | struct clk_hw_omap *gate; | |
257 | u32 val = 0; | |
258 | ||
259 | gate = kzalloc(sizeof(*gate), GFP_KERNEL); | |
260 | if (!gate) | |
261 | return; | |
262 | ||
263 | gate->enable_reg = ti_clk_get_reg_addr(node, 0); | |
c807dbed | 264 | if (IS_ERR(gate->enable_reg)) |
f60b1ea5 TK |
265 | goto cleanup; |
266 | ||
267 | of_property_read_u32(node, "ti,bit-shift", &val); | |
268 | ||
269 | gate->enable_bit = val; | |
270 | gate->ops = hw_ops; | |
f60b1ea5 TK |
271 | |
272 | if (!ti_clk_add_component(node, &gate->hw, CLK_COMPONENT_TYPE_GATE)) | |
273 | return; | |
274 | ||
275 | cleanup: | |
276 | kfree(gate); | |
277 | } | |
278 | ||
279 | static void __init | |
280 | of_ti_composite_no_wait_gate_clk_setup(struct device_node *node) | |
281 | { | |
282 | _of_ti_composite_gate_clk_setup(node, NULL); | |
283 | } | |
284 | CLK_OF_DECLARE(ti_composite_no_wait_gate_clk, "ti,composite-no-wait-gate-clock", | |
285 | of_ti_composite_no_wait_gate_clk_setup); | |
286 | ||
b3654d70 | 287 | #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3) |
f60b1ea5 TK |
288 | static void __init of_ti_composite_interface_clk_setup(struct device_node *node) |
289 | { | |
290 | _of_ti_composite_gate_clk_setup(node, &clkhwops_iclk_wait); | |
291 | } | |
292 | CLK_OF_DECLARE(ti_composite_interface_clk, "ti,composite-interface-clock", | |
293 | of_ti_composite_interface_clk_setup); | |
294 | #endif | |
295 | ||
296 | static void __init of_ti_composite_gate_clk_setup(struct device_node *node) | |
297 | { | |
298 | _of_ti_composite_gate_clk_setup(node, &clkhwops_wait); | |
299 | } | |
300 | CLK_OF_DECLARE(ti_composite_gate_clk, "ti,composite-gate-clock", | |
301 | of_ti_composite_gate_clk_setup); | |
302 | ||
303 | ||
304 | static void __init of_ti_clkdm_gate_clk_setup(struct device_node *node) | |
305 | { | |
306 | _of_ti_gate_clk_setup(node, &omap_gate_clkdm_clk_ops, NULL); | |
307 | } | |
308 | CLK_OF_DECLARE(ti_clkdm_gate_clk, "ti,clkdm-gate-clock", | |
309 | of_ti_clkdm_gate_clk_setup); | |
310 | ||
311 | static void __init of_ti_hsdiv_gate_clk_setup(struct device_node *node) | |
312 | { | |
313 | _of_ti_gate_clk_setup(node, &omap_gate_clk_hsdiv_restore_ops, | |
314 | &clkhwops_wait); | |
315 | } | |
316 | CLK_OF_DECLARE(ti_hsdiv_gate_clk, "ti,hsdiv-gate-clock", | |
317 | of_ti_hsdiv_gate_clk_setup); | |
318 | ||
319 | static void __init of_ti_gate_clk_setup(struct device_node *node) | |
320 | { | |
321 | _of_ti_gate_clk_setup(node, &omap_gate_clk_ops, NULL); | |
322 | } | |
826d8958 | 323 | CLK_OF_DECLARE(ti_gate_clk, "ti,gate-clock", of_ti_gate_clk_setup); |
f60b1ea5 TK |
324 | |
325 | static void __init of_ti_wait_gate_clk_setup(struct device_node *node) | |
326 | { | |
327 | _of_ti_gate_clk_setup(node, &omap_gate_clk_ops, &clkhwops_wait); | |
328 | } | |
329 | CLK_OF_DECLARE(ti_wait_gate_clk, "ti,wait-gate-clock", | |
330 | of_ti_wait_gate_clk_setup); | |
331 | ||
332 | #ifdef CONFIG_ARCH_OMAP3 | |
333 | static void __init of_ti_am35xx_gate_clk_setup(struct device_node *node) | |
334 | { | |
335 | _of_ti_gate_clk_setup(node, &omap_gate_clk_ops, | |
336 | &clkhwops_am35xx_ipss_module_wait); | |
337 | } | |
338 | CLK_OF_DECLARE(ti_am35xx_gate_clk, "ti,am35xx-gate-clock", | |
339 | of_ti_am35xx_gate_clk_setup); | |
340 | ||
341 | static void __init of_ti_dss_gate_clk_setup(struct device_node *node) | |
342 | { | |
343 | _of_ti_gate_clk_setup(node, &omap_gate_clk_ops, | |
344 | &clkhwops_omap3430es2_dss_usbhost_wait); | |
345 | } | |
346 | CLK_OF_DECLARE(ti_dss_gate_clk, "ti,dss-gate-clock", | |
347 | of_ti_dss_gate_clk_setup); | |
348 | #endif |