Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 1 | /* |
| 2 | * linux/arch/arm/mach-omap2/clock.c |
| 3 | * |
Tony Lindgren | a16e970 | 2008-03-18 11:56:39 +0200 | [diff] [blame] | 4 | * Copyright (C) 2005-2008 Texas Instruments, Inc. |
Paul Walmsley | 8c34974 | 2010-02-22 22:09:24 -0700 | [diff] [blame] | 5 | * Copyright (C) 2004-2010 Nokia Corporation |
Tony Lindgren | a16e970 | 2008-03-18 11:56:39 +0200 | [diff] [blame] | 6 | * |
| 7 | * Contacts: |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 8 | * Richard Woodruff <r-woodruff2@ti.com> |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 9 | * Paul Walmsley |
| 10 | * |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 11 | * This program is free software; you can redistribute it and/or modify |
| 12 | * it under the terms of the GNU General Public License version 2 as |
| 13 | * published by the Free Software Foundation. |
| 14 | */ |
| 15 | #undef DEBUG |
| 16 | |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 17 | #include <linux/kernel.h> |
Paul Walmsley | 1fe9be8 | 2012-09-27 10:33:33 -0600 | [diff] [blame] | 18 | #include <linux/export.h> |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 19 | #include <linux/list.h> |
| 20 | #include <linux/errno.h> |
Paul Walmsley | 4d30e82 | 2010-02-22 22:09:36 -0700 | [diff] [blame] | 21 | #include <linux/err.h> |
| 22 | #include <linux/delay.h> |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 23 | #include <linux/clk.h> |
Russell King | fced80c | 2008-09-06 12:10:45 +0100 | [diff] [blame] | 24 | #include <linux/io.h> |
Russell King | fbd3bdb | 2008-09-06 12:13:59 +0100 | [diff] [blame] | 25 | #include <linux/bitops.h> |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 26 | |
Jean Pihet | 5e7c58d | 2011-03-03 11:25:43 +0100 | [diff] [blame] | 27 | #include <asm/cpu.h> |
Tony Lindgren | dbc0416 | 2012-08-31 10:59:07 -0700 | [diff] [blame] | 28 | |
Tony Lindgren | ce491cf | 2009-10-20 09:40:47 -0700 | [diff] [blame] | 29 | #include <plat/prcm.h> |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 30 | |
Tony Lindgren | dbc0416 | 2012-08-31 10:59:07 -0700 | [diff] [blame] | 31 | #include <trace/events/power.h> |
| 32 | |
| 33 | #include "soc.h" |
| 34 | #include "clockdomain.h" |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 35 | #include "clock.h" |
Paul Walmsley | ff4ae5d | 2012-10-21 01:01:11 -0600 | [diff] [blame] | 36 | #include "cm2xxx.h" |
| 37 | #include "cm3xxx.h" |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 38 | #include "cm-regbits-24xx.h" |
| 39 | #include "cm-regbits-34xx.h" |
| 40 | |
Afzal Mohammed | 9954119 | 2011-12-13 10:46:43 -0800 | [diff] [blame] | 41 | u16 cpu_mask; |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 42 | |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 43 | /* |
Paul Walmsley | 12706c5 | 2011-07-10 05:57:06 -0600 | [diff] [blame] | 44 | * clkdm_control: if true, then when a clock is enabled in the |
| 45 | * hardware, its clockdomain will first be enabled; and when a clock |
| 46 | * is disabled in the hardware, its clockdomain will be disabled |
| 47 | * afterwards. |
| 48 | */ |
| 49 | static bool clkdm_control = true; |
| 50 | |
Paul Walmsley | 1fe9be8 | 2012-09-27 10:33:33 -0600 | [diff] [blame] | 51 | static LIST_HEAD(clocks); |
| 52 | static DEFINE_MUTEX(clocks_mutex); |
| 53 | static DEFINE_SPINLOCK(clockfw_lock); |
| 54 | |
Paul Walmsley | 12706c5 | 2011-07-10 05:57:06 -0600 | [diff] [blame] | 55 | /* |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 56 | * OMAP2+ specific clock functions |
| 57 | */ |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 58 | |
Paul Walmsley | 4b1f76e | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 59 | /* Private functions */ |
| 60 | |
| 61 | /** |
| 62 | * _omap2_module_wait_ready - wait for an OMAP module to leave IDLE |
| 63 | * @clk: struct clk * belonging to the module |
| 64 | * |
| 65 | * If the necessary clocks for the OMAP hardware IP block that |
| 66 | * corresponds to clock @clk are enabled, then wait for the module to |
| 67 | * indicate readiness (i.e., to leave IDLE). This code does not |
| 68 | * belong in the clock code and will be moved in the medium term to |
| 69 | * module-dependent code. No return value. |
| 70 | */ |
| 71 | static void _omap2_module_wait_ready(struct clk *clk) |
| 72 | { |
| 73 | void __iomem *companion_reg, *idlest_reg; |
Ranjith Lohithakshan | 419cc97 | 2010-02-24 12:05:54 -0700 | [diff] [blame] | 74 | u8 other_bit, idlest_bit, idlest_val; |
Paul Walmsley | 4b1f76e | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 75 | |
| 76 | /* Not all modules have multiple clocks that their IDLEST depends on */ |
| 77 | if (clk->ops->find_companion) { |
| 78 | clk->ops->find_companion(clk, &companion_reg, &other_bit); |
| 79 | if (!(__raw_readl(companion_reg) & (1 << other_bit))) |
| 80 | return; |
| 81 | } |
| 82 | |
Ranjith Lohithakshan | 419cc97 | 2010-02-24 12:05:54 -0700 | [diff] [blame] | 83 | clk->ops->find_idlest(clk, &idlest_reg, &idlest_bit, &idlest_val); |
Paul Walmsley | 4b1f76e | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 84 | |
Ranjith Lohithakshan | 419cc97 | 2010-02-24 12:05:54 -0700 | [diff] [blame] | 85 | omap2_cm_wait_idlest(idlest_reg, (1 << idlest_bit), idlest_val, |
Rajendra Nayak | 5dcc3b9 | 2012-09-22 02:24:17 -0600 | [diff] [blame] | 86 | __clk_get_name(clk)); |
Paul Walmsley | 4b1f76e | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 87 | } |
| 88 | |
Paul Walmsley | 4b1f76e | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 89 | /* Public functions */ |
| 90 | |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 91 | /** |
Paul Walmsley | 333943b | 2008-08-19 11:08:45 +0300 | [diff] [blame] | 92 | * omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk |
| 93 | * @clk: OMAP clock struct ptr to use |
| 94 | * |
| 95 | * Convert a clockdomain name stored in a struct clk 'clk' into a |
| 96 | * clockdomain pointer, and save it into the struct clk. Intended to be |
| 97 | * called during clk_register(). No return value. |
| 98 | */ |
| 99 | void omap2_init_clk_clkdm(struct clk *clk) |
| 100 | { |
| 101 | struct clockdomain *clkdm; |
Rajendra Nayak | 5dcc3b9 | 2012-09-22 02:24:17 -0600 | [diff] [blame] | 102 | const char *clk_name; |
Paul Walmsley | 333943b | 2008-08-19 11:08:45 +0300 | [diff] [blame] | 103 | |
| 104 | if (!clk->clkdm_name) |
| 105 | return; |
| 106 | |
Rajendra Nayak | 5dcc3b9 | 2012-09-22 02:24:17 -0600 | [diff] [blame] | 107 | clk_name = __clk_get_name(clk); |
| 108 | |
Paul Walmsley | 333943b | 2008-08-19 11:08:45 +0300 | [diff] [blame] | 109 | clkdm = clkdm_lookup(clk->clkdm_name); |
| 110 | if (clkdm) { |
| 111 | pr_debug("clock: associated clk %s to clkdm %s\n", |
Rajendra Nayak | 5dcc3b9 | 2012-09-22 02:24:17 -0600 | [diff] [blame] | 112 | clk_name, clk->clkdm_name); |
Paul Walmsley | 333943b | 2008-08-19 11:08:45 +0300 | [diff] [blame] | 113 | clk->clkdm = clkdm; |
| 114 | } else { |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 115 | pr_debug("clock: could not associate clk %s to clkdm %s\n", |
Rajendra Nayak | 5dcc3b9 | 2012-09-22 02:24:17 -0600 | [diff] [blame] | 116 | clk_name, clk->clkdm_name); |
Paul Walmsley | 333943b | 2008-08-19 11:08:45 +0300 | [diff] [blame] | 117 | } |
| 118 | } |
| 119 | |
| 120 | /** |
Paul Walmsley | 12706c5 | 2011-07-10 05:57:06 -0600 | [diff] [blame] | 121 | * omap2_clk_disable_clkdm_control - disable clkdm control on clk enable/disable |
| 122 | * |
| 123 | * Prevent the OMAP clock code from calling into the clockdomain code |
| 124 | * when a hardware clock in that clockdomain is enabled or disabled. |
| 125 | * Intended to be called at init time from omap*_clk_init(). No |
| 126 | * return value. |
| 127 | */ |
| 128 | void __init omap2_clk_disable_clkdm_control(void) |
| 129 | { |
| 130 | clkdm_control = false; |
| 131 | } |
| 132 | |
| 133 | /** |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 134 | * omap2_clk_dflt_find_companion - find companion clock to @clk |
| 135 | * @clk: struct clk * to find the companion clock of |
| 136 | * @other_reg: void __iomem ** to return the companion clock CM_*CLKEN va in |
| 137 | * @other_bit: u8 ** to return the companion clock bit shift in |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 138 | * |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 139 | * Note: We don't need special code here for INVERT_ENABLE for the |
| 140 | * time being since INVERT_ENABLE only applies to clocks enabled by |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 141 | * CM_CLKEN_PLL |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 142 | * |
| 143 | * Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes it's |
| 144 | * just a matter of XORing the bits. |
| 145 | * |
| 146 | * Some clocks don't have companion clocks. For example, modules with |
| 147 | * only an interface clock (such as MAILBOXES) don't have a companion |
| 148 | * clock. Right now, this code relies on the hardware exporting a bit |
| 149 | * in the correct companion register that indicates that the |
| 150 | * nonexistent 'companion clock' is active. Future patches will |
| 151 | * associate this type of code with per-module data structures to |
| 152 | * avoid this issue, and remove the casts. No return value. |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 153 | */ |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 154 | void omap2_clk_dflt_find_companion(struct clk *clk, void __iomem **other_reg, |
| 155 | u8 *other_bit) |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 156 | { |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 157 | u32 r; |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 158 | |
Russell King | c1168dc | 2008-11-04 21:24:00 +0000 | [diff] [blame] | 159 | /* |
| 160 | * Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes |
| 161 | * it's just a matter of XORing the bits. |
| 162 | */ |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 163 | r = ((__force u32)clk->enable_reg ^ (CM_FCLKEN ^ CM_ICLKEN)); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 164 | |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 165 | *other_reg = (__force void __iomem *)r; |
| 166 | *other_bit = clk->enable_bit; |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 167 | } |
| 168 | |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 169 | /** |
| 170 | * omap2_clk_dflt_find_idlest - find CM_IDLEST reg va, bit shift for @clk |
| 171 | * @clk: struct clk * to find IDLEST info for |
| 172 | * @idlest_reg: void __iomem ** to return the CM_IDLEST va in |
Ranjith Lohithakshan | 419cc97 | 2010-02-24 12:05:54 -0700 | [diff] [blame] | 173 | * @idlest_bit: u8 * to return the CM_IDLEST bit shift in |
| 174 | * @idlest_val: u8 * to return the idle status indicator |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 175 | * |
| 176 | * Return the CM_IDLEST register address and bit shift corresponding |
| 177 | * to the module that "owns" this clock. This default code assumes |
| 178 | * that the CM_IDLEST bit shift is the CM_*CLKEN bit shift, and that |
| 179 | * the IDLEST register address ID corresponds to the CM_*CLKEN |
| 180 | * register address ID (e.g., that CM_FCLKEN2 corresponds to |
| 181 | * CM_IDLEST2). This is not true for all modules. No return value. |
| 182 | */ |
| 183 | void omap2_clk_dflt_find_idlest(struct clk *clk, void __iomem **idlest_reg, |
Ranjith Lohithakshan | 419cc97 | 2010-02-24 12:05:54 -0700 | [diff] [blame] | 184 | u8 *idlest_bit, u8 *idlest_val) |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 185 | { |
| 186 | u32 r; |
| 187 | |
| 188 | r = (((__force u32)clk->enable_reg & ~0xf0) | 0x20); |
| 189 | *idlest_reg = (__force void __iomem *)r; |
| 190 | *idlest_bit = clk->enable_bit; |
Ranjith Lohithakshan | 419cc97 | 2010-02-24 12:05:54 -0700 | [diff] [blame] | 191 | |
| 192 | /* |
| 193 | * 24xx uses 0 to indicate not ready, and 1 to indicate ready. |
| 194 | * 34xx reverses this, just to keep us on our toes |
| 195 | * AM35xx uses both, depending on the module. |
| 196 | */ |
| 197 | if (cpu_is_omap24xx()) |
| 198 | *idlest_val = OMAP24XX_CM_IDLEST_VAL; |
| 199 | else if (cpu_is_omap34xx()) |
| 200 | *idlest_val = OMAP34XX_CM_IDLEST_VAL; |
| 201 | else |
| 202 | BUG(); |
| 203 | |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 204 | } |
| 205 | |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 206 | int omap2_dflt_clk_enable(struct clk *clk) |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 207 | { |
Paul Walmsley | ee1eec3 | 2009-01-28 12:18:19 -0700 | [diff] [blame] | 208 | u32 v; |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 209 | |
Russell King | c0fc18c5 | 2008-09-05 15:10:27 +0100 | [diff] [blame] | 210 | if (unlikely(clk->enable_reg == NULL)) { |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 211 | pr_err("clock.c: Enable for %s without enable code\n", |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 212 | clk->name); |
| 213 | return 0; /* REVISIT: -EINVAL */ |
| 214 | } |
| 215 | |
Paul Walmsley | ee1eec3 | 2009-01-28 12:18:19 -0700 | [diff] [blame] | 216 | v = __raw_readl(clk->enable_reg); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 217 | if (clk->flags & INVERT_ENABLE) |
Paul Walmsley | ee1eec3 | 2009-01-28 12:18:19 -0700 | [diff] [blame] | 218 | v &= ~(1 << clk->enable_bit); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 219 | else |
Paul Walmsley | ee1eec3 | 2009-01-28 12:18:19 -0700 | [diff] [blame] | 220 | v |= (1 << clk->enable_bit); |
| 221 | __raw_writel(v, clk->enable_reg); |
Paul Walmsley | f11fda6 | 2009-01-28 12:35:06 -0700 | [diff] [blame] | 222 | v = __raw_readl(clk->enable_reg); /* OCP barrier */ |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 223 | |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 224 | if (clk->ops->find_idlest) |
Paul Walmsley | 4b1f76e | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 225 | _omap2_module_wait_ready(clk); |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 226 | |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 227 | return 0; |
| 228 | } |
| 229 | |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 230 | void omap2_dflt_clk_disable(struct clk *clk) |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 231 | { |
Paul Walmsley | ee1eec3 | 2009-01-28 12:18:19 -0700 | [diff] [blame] | 232 | u32 v; |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 233 | |
Paul Walmsley | fecb494 | 2009-01-27 19:12:50 -0700 | [diff] [blame] | 234 | if (!clk->enable_reg) { |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 235 | /* |
| 236 | * 'Independent' here refers to a clock which is not |
| 237 | * controlled by its parent. |
| 238 | */ |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 239 | pr_err("clock: clk_disable called on independent clock %s which has no enable_reg\n", clk->name); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 240 | return; |
| 241 | } |
| 242 | |
Paul Walmsley | ee1eec3 | 2009-01-28 12:18:19 -0700 | [diff] [blame] | 243 | v = __raw_readl(clk->enable_reg); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 244 | if (clk->flags & INVERT_ENABLE) |
Paul Walmsley | ee1eec3 | 2009-01-28 12:18:19 -0700 | [diff] [blame] | 245 | v |= (1 << clk->enable_bit); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 246 | else |
Paul Walmsley | ee1eec3 | 2009-01-28 12:18:19 -0700 | [diff] [blame] | 247 | v &= ~(1 << clk->enable_bit); |
| 248 | __raw_writel(v, clk->enable_reg); |
Paul Walmsley | de07fed | 2009-01-28 12:35:01 -0700 | [diff] [blame] | 249 | /* No OCP barrier needed here since it is a disable operation */ |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 250 | } |
| 251 | |
Russell King | b36ee72 | 2008-11-04 17:59:52 +0000 | [diff] [blame] | 252 | const struct clkops clkops_omap2_dflt_wait = { |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 253 | .enable = omap2_dflt_clk_enable, |
Russell King | b36ee72 | 2008-11-04 17:59:52 +0000 | [diff] [blame] | 254 | .disable = omap2_dflt_clk_disable, |
Paul Walmsley | 72350b2 | 2009-07-24 19:44:03 -0600 | [diff] [blame] | 255 | .find_companion = omap2_clk_dflt_find_companion, |
| 256 | .find_idlest = omap2_clk_dflt_find_idlest, |
Russell King | b36ee72 | 2008-11-04 17:59:52 +0000 | [diff] [blame] | 257 | }; |
| 258 | |
Russell King | bc51da4 | 2008-11-04 18:59:32 +0000 | [diff] [blame] | 259 | const struct clkops clkops_omap2_dflt = { |
| 260 | .enable = omap2_dflt_clk_enable, |
| 261 | .disable = omap2_dflt_clk_disable, |
| 262 | }; |
| 263 | |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 264 | /** |
| 265 | * omap2_clk_disable - disable a clock, if the system is not using it |
| 266 | * @clk: struct clk * to disable |
| 267 | * |
| 268 | * Decrements the usecount on struct clk @clk. If there are no users |
| 269 | * left, call the clkops-specific clock disable function to disable it |
| 270 | * in hardware. If the clock is part of a clockdomain (which they all |
| 271 | * should be), request that the clockdomain be disabled. (It too has |
| 272 | * a usecount, and so will not be disabled in the hardware until it no |
| 273 | * longer has any users.) If the clock has a parent clock (most of |
| 274 | * them do), then call ourselves, recursing on the parent clock. This |
| 275 | * can cause an entire branch of the clock tree to be powered off by |
| 276 | * simply disabling one clock. Intended to be called with the clockfw_lock |
| 277 | * spinlock held. No return value. |
| 278 | */ |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 279 | void omap2_clk_disable(struct clk *clk) |
| 280 | { |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 281 | if (clk->usecount == 0) { |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 282 | WARN(1, "clock: %s: omap2_clk_disable() called, but usecount already 0?", clk->name); |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 283 | return; |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 284 | } |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 285 | |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 286 | pr_debug("clock: %s: decrementing usecount\n", clk->name); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 287 | |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 288 | clk->usecount--; |
Paul Walmsley | 333943b | 2008-08-19 11:08:45 +0300 | [diff] [blame] | 289 | |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 290 | if (clk->usecount > 0) |
| 291 | return; |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 292 | |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 293 | pr_debug("clock: %s: disabling in hardware\n", clk->name); |
Russell King | a7f8c59 | 2009-01-31 11:00:17 +0000 | [diff] [blame] | 294 | |
Jean Pihet | 5e7c58d | 2011-03-03 11:25:43 +0100 | [diff] [blame] | 295 | if (clk->ops && clk->ops->disable) { |
| 296 | trace_clock_disable(clk->name, 0, smp_processor_id()); |
Rajendra Nayak | 6c52f32 | 2011-02-25 15:48:36 -0700 | [diff] [blame] | 297 | clk->ops->disable(clk); |
Jean Pihet | 5e7c58d | 2011-03-03 11:25:43 +0100 | [diff] [blame] | 298 | } |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 299 | |
Paul Walmsley | 12706c5 | 2011-07-10 05:57:06 -0600 | [diff] [blame] | 300 | if (clkdm_control && clk->clkdm) |
Rajendra Nayak | 4da71ae | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 301 | clkdm_clk_disable(clk->clkdm, clk); |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 302 | |
| 303 | if (clk->parent) |
| 304 | omap2_clk_disable(clk->parent); |
| 305 | } |
| 306 | |
| 307 | /** |
| 308 | * omap2_clk_enable - request that the system enable a clock |
| 309 | * @clk: struct clk * to enable |
| 310 | * |
| 311 | * Increments the usecount on struct clk @clk. If there were no users |
| 312 | * previously, then recurse up the clock tree, enabling all of the |
| 313 | * clock's parents and all of the parent clockdomains, and finally, |
| 314 | * enabling @clk's clockdomain, and @clk itself. Intended to be |
| 315 | * called with the clockfw_lock spinlock held. Returns 0 upon success |
| 316 | * or a negative error code upon failure. |
| 317 | */ |
| 318 | int omap2_clk_enable(struct clk *clk) |
| 319 | { |
| 320 | int ret; |
| 321 | |
| 322 | pr_debug("clock: %s: incrementing usecount\n", clk->name); |
| 323 | |
| 324 | clk->usecount++; |
| 325 | |
| 326 | if (clk->usecount > 1) |
| 327 | return 0; |
| 328 | |
| 329 | pr_debug("clock: %s: enabling in hardware\n", clk->name); |
| 330 | |
| 331 | if (clk->parent) { |
| 332 | ret = omap2_clk_enable(clk->parent); |
| 333 | if (ret) { |
| 334 | WARN(1, "clock: %s: could not enable parent %s: %d\n", |
| 335 | clk->name, clk->parent->name, ret); |
| 336 | goto oce_err1; |
| 337 | } |
| 338 | } |
| 339 | |
Paul Walmsley | 12706c5 | 2011-07-10 05:57:06 -0600 | [diff] [blame] | 340 | if (clkdm_control && clk->clkdm) { |
Rajendra Nayak | 4da71ae | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 341 | ret = clkdm_clk_enable(clk->clkdm, clk); |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 342 | if (ret) { |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 343 | WARN(1, "clock: %s: could not enable clockdomain %s: %d\n", |
| 344 | clk->name, clk->clkdm->name, ret); |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 345 | goto oce_err2; |
| 346 | } |
| 347 | } |
| 348 | |
Rajendra Nayak | 6c52f32 | 2011-02-25 15:48:36 -0700 | [diff] [blame] | 349 | if (clk->ops && clk->ops->enable) { |
Jean Pihet | 5e7c58d | 2011-03-03 11:25:43 +0100 | [diff] [blame] | 350 | trace_clock_enable(clk->name, 1, smp_processor_id()); |
Rajendra Nayak | 6c52f32 | 2011-02-25 15:48:36 -0700 | [diff] [blame] | 351 | ret = clk->ops->enable(clk); |
| 352 | if (ret) { |
| 353 | WARN(1, "clock: %s: could not enable: %d\n", |
| 354 | clk->name, ret); |
| 355 | goto oce_err3; |
| 356 | } |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 357 | } |
| 358 | |
| 359 | return 0; |
| 360 | |
| 361 | oce_err3: |
Paul Walmsley | 12706c5 | 2011-07-10 05:57:06 -0600 | [diff] [blame] | 362 | if (clkdm_control && clk->clkdm) |
Rajendra Nayak | 4da71ae | 2011-02-25 16:06:48 -0700 | [diff] [blame] | 363 | clkdm_clk_disable(clk->clkdm, clk); |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 364 | oce_err2: |
| 365 | if (clk->parent) |
| 366 | omap2_clk_disable(clk->parent); |
| 367 | oce_err1: |
Russell King | a7f8c59 | 2009-01-31 11:00:17 +0000 | [diff] [blame] | 368 | clk->usecount--; |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 369 | |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 370 | return ret; |
| 371 | } |
| 372 | |
Paul Walmsley | 435699d | 2010-05-18 18:40:24 -0600 | [diff] [blame] | 373 | /* Given a clock and a rate apply a clock specific rounding function */ |
| 374 | long omap2_clk_round_rate(struct clk *clk, unsigned long rate) |
| 375 | { |
| 376 | if (clk->round_rate) |
| 377 | return clk->round_rate(clk, rate); |
| 378 | |
| 379 | return clk->rate; |
| 380 | } |
| 381 | |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 382 | /* Set the clock rate for a clock source */ |
| 383 | int omap2_clk_set_rate(struct clk *clk, unsigned long rate) |
| 384 | { |
| 385 | int ret = -EINVAL; |
| 386 | |
| 387 | pr_debug("clock: set_rate for clock %s to rate %ld\n", clk->name, rate); |
| 388 | |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 389 | /* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */ |
Jean Pihet | 5e7c58d | 2011-03-03 11:25:43 +0100 | [diff] [blame] | 390 | if (clk->set_rate) { |
| 391 | trace_clock_set_rate(clk->name, rate, smp_processor_id()); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 392 | ret = clk->set_rate(clk, rate); |
Jean Pihet | 5e7c58d | 2011-03-03 11:25:43 +0100 | [diff] [blame] | 393 | } |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 394 | |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 395 | return ret; |
| 396 | } |
| 397 | |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 398 | int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent) |
| 399 | { |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 400 | if (!clk->clksel) |
| 401 | return -EINVAL; |
| 402 | |
Paul Walmsley | 1a33771 | 2010-02-22 22:09:16 -0700 | [diff] [blame] | 403 | if (clk->parent == new_parent) |
| 404 | return 0; |
| 405 | |
Paul Walmsley | df791b3 | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 406 | return omap2_clksel_set_parent(clk, new_parent); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 407 | } |
| 408 | |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 409 | /* |
| 410 | * OMAP2+ clock reset and init functions |
| 411 | */ |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 412 | |
| 413 | #ifdef CONFIG_OMAP_RESET_CLOCKS |
| 414 | void omap2_clk_disable_unused(struct clk *clk) |
| 415 | { |
| 416 | u32 regval32, v; |
| 417 | |
| 418 | v = (clk->flags & INVERT_ENABLE) ? (1 << clk->enable_bit) : 0; |
| 419 | |
| 420 | regval32 = __raw_readl(clk->enable_reg); |
| 421 | if ((regval32 & (1 << clk->enable_bit)) == v) |
| 422 | return; |
| 423 | |
Paul Walmsley | 6041c27 | 2010-10-08 11:40:20 -0600 | [diff] [blame] | 424 | pr_debug("Disabling unused clock \"%s\"\n", clk->name); |
Tero Kristo | 8463e20 | 2009-01-28 12:27:45 -0700 | [diff] [blame] | 425 | if (cpu_is_omap34xx()) { |
| 426 | omap2_clk_enable(clk); |
| 427 | omap2_clk_disable(clk); |
Paul Walmsley | 30962d9 | 2010-02-22 22:09:38 -0700 | [diff] [blame] | 428 | } else { |
| 429 | clk->ops->disable(clk); |
| 430 | } |
Peter 'p2' De Schrijver | fe617af | 2008-10-15 17:48:44 +0300 | [diff] [blame] | 431 | if (clk->clkdm != NULL) |
Santosh Shilimkar | 5a68a73 | 2012-05-07 23:55:38 -0600 | [diff] [blame] | 432 | pwrdm_state_switch(clk->clkdm->pwrdm.ptr); |
Paul Walmsley | 543d937 | 2008-03-18 10:22:06 +0200 | [diff] [blame] | 433 | } |
| 434 | #endif |
Paul Walmsley | 69ecefc | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 435 | |
Paul Walmsley | 4d30e82 | 2010-02-22 22:09:36 -0700 | [diff] [blame] | 436 | /** |
| 437 | * omap2_clk_switch_mpurate_at_boot - switch ARM MPU rate by boot-time argument |
| 438 | * @mpurate_ck_name: clk name of the clock to change rate |
| 439 | * |
| 440 | * Change the ARM MPU clock rate to the rate specified on the command |
| 441 | * line, if one was specified. @mpurate_ck_name should be |
| 442 | * "virt_prcm_set" on OMAP2xxx and "dpll1_ck" on OMAP34xx/OMAP36xx. |
| 443 | * XXX Does not handle voltage scaling - on OMAP2xxx this is currently |
| 444 | * handled by the virt_prcm_set clock, but this should be handled by |
| 445 | * the OPP layer. XXX This is intended to be handled by the OPP layer |
| 446 | * code in the near future and should be removed from the clock code. |
| 447 | * Returns -EINVAL if 'mpurate' is zero or if clk_set_rate() rejects |
| 448 | * the rate, -ENOENT if the struct clk referred to by @mpurate_ck_name |
| 449 | * cannot be found, or 0 upon success. |
| 450 | */ |
| 451 | int __init omap2_clk_switch_mpurate_at_boot(const char *mpurate_ck_name) |
| 452 | { |
| 453 | struct clk *mpurate_ck; |
| 454 | int r; |
| 455 | |
| 456 | if (!mpurate) |
| 457 | return -EINVAL; |
| 458 | |
| 459 | mpurate_ck = clk_get(NULL, mpurate_ck_name); |
| 460 | if (WARN(IS_ERR(mpurate_ck), "Failed to get %s.\n", mpurate_ck_name)) |
| 461 | return -ENOENT; |
| 462 | |
| 463 | r = clk_set_rate(mpurate_ck, mpurate); |
| 464 | if (IS_ERR_VALUE(r)) { |
| 465 | WARN(1, "clock: %s: unable to set MPU rate to %d: %d\n", |
| 466 | mpurate_ck->name, mpurate, r); |
Julia Lawall | f6281f6 | 2011-07-04 04:08:10 -0700 | [diff] [blame] | 467 | clk_put(mpurate_ck); |
Paul Walmsley | 4d30e82 | 2010-02-22 22:09:36 -0700 | [diff] [blame] | 468 | return -EINVAL; |
| 469 | } |
| 470 | |
| 471 | calibrate_delay(); |
| 472 | recalculate_root_clocks(); |
| 473 | |
| 474 | clk_put(mpurate_ck); |
| 475 | |
| 476 | return 0; |
| 477 | } |
| 478 | |
| 479 | /** |
| 480 | * omap2_clk_print_new_rates - print summary of current clock tree rates |
| 481 | * @hfclkin_ck_name: clk name for the off-chip HF oscillator |
| 482 | * @core_ck_name: clk name for the on-chip CORE_CLK |
| 483 | * @mpu_ck_name: clk name for the ARM MPU clock |
| 484 | * |
| 485 | * Prints a short message to the console with the HFCLKIN oscillator |
| 486 | * rate, the rate of the CORE clock, and the rate of the ARM MPU clock. |
| 487 | * Called by the boot-time MPU rate switching code. XXX This is intended |
| 488 | * to be handled by the OPP layer code in the near future and should be |
| 489 | * removed from the clock code. No return value. |
| 490 | */ |
| 491 | void __init omap2_clk_print_new_rates(const char *hfclkin_ck_name, |
| 492 | const char *core_ck_name, |
| 493 | const char *mpu_ck_name) |
| 494 | { |
| 495 | struct clk *hfclkin_ck, *core_ck, *mpu_ck; |
| 496 | unsigned long hfclkin_rate; |
| 497 | |
| 498 | mpu_ck = clk_get(NULL, mpu_ck_name); |
| 499 | if (WARN(IS_ERR(mpu_ck), "clock: failed to get %s.\n", mpu_ck_name)) |
| 500 | return; |
| 501 | |
| 502 | core_ck = clk_get(NULL, core_ck_name); |
| 503 | if (WARN(IS_ERR(core_ck), "clock: failed to get %s.\n", core_ck_name)) |
| 504 | return; |
| 505 | |
| 506 | hfclkin_ck = clk_get(NULL, hfclkin_ck_name); |
| 507 | if (WARN(IS_ERR(hfclkin_ck), "Failed to get %s.\n", hfclkin_ck_name)) |
| 508 | return; |
| 509 | |
| 510 | hfclkin_rate = clk_get_rate(hfclkin_ck); |
| 511 | |
Paul Walmsley | 7852ec0 | 2012-07-26 00:54:26 -0600 | [diff] [blame] | 512 | pr_info("Switched to new clocking rate (Crystal/Core/MPU): %ld.%01ld/%ld/%ld MHz\n", |
| 513 | (hfclkin_rate / 1000000), ((hfclkin_rate / 100000) % 10), |
Paul Walmsley | 4d30e82 | 2010-02-22 22:09:36 -0700 | [diff] [blame] | 514 | (clk_get_rate(core_ck) / 1000000), |
| 515 | (clk_get_rate(mpu_ck) / 1000000)); |
| 516 | } |
| 517 | |
Paul Walmsley | 69ecefc | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 518 | /* Common data */ |
| 519 | |
Paul Walmsley | 1fe9be8 | 2012-09-27 10:33:33 -0600 | [diff] [blame] | 520 | int clk_enable(struct clk *clk) |
| 521 | { |
| 522 | unsigned long flags; |
| 523 | int ret; |
| 524 | |
| 525 | if (clk == NULL || IS_ERR(clk)) |
| 526 | return -EINVAL; |
| 527 | |
| 528 | spin_lock_irqsave(&clockfw_lock, flags); |
| 529 | ret = omap2_clk_enable(clk); |
| 530 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 531 | |
| 532 | return ret; |
| 533 | } |
| 534 | EXPORT_SYMBOL(clk_enable); |
| 535 | |
| 536 | void clk_disable(struct clk *clk) |
| 537 | { |
| 538 | unsigned long flags; |
| 539 | |
| 540 | if (clk == NULL || IS_ERR(clk)) |
| 541 | return; |
| 542 | |
| 543 | spin_lock_irqsave(&clockfw_lock, flags); |
| 544 | if (clk->usecount == 0) { |
| 545 | pr_err("Trying disable clock %s with 0 usecount\n", |
| 546 | clk->name); |
| 547 | WARN_ON(1); |
| 548 | goto out; |
| 549 | } |
| 550 | |
| 551 | omap2_clk_disable(clk); |
| 552 | |
| 553 | out: |
| 554 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 555 | } |
| 556 | EXPORT_SYMBOL(clk_disable); |
| 557 | |
| 558 | unsigned long clk_get_rate(struct clk *clk) |
| 559 | { |
| 560 | unsigned long flags; |
| 561 | unsigned long ret; |
| 562 | |
| 563 | if (clk == NULL || IS_ERR(clk)) |
| 564 | return 0; |
| 565 | |
| 566 | spin_lock_irqsave(&clockfw_lock, flags); |
| 567 | ret = clk->rate; |
| 568 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 569 | |
| 570 | return ret; |
| 571 | } |
| 572 | EXPORT_SYMBOL(clk_get_rate); |
| 573 | |
| 574 | /* |
| 575 | * Optional clock functions defined in include/linux/clk.h |
| 576 | */ |
| 577 | |
| 578 | long clk_round_rate(struct clk *clk, unsigned long rate) |
| 579 | { |
| 580 | unsigned long flags; |
| 581 | long ret; |
| 582 | |
| 583 | if (clk == NULL || IS_ERR(clk)) |
| 584 | return 0; |
| 585 | |
| 586 | spin_lock_irqsave(&clockfw_lock, flags); |
| 587 | ret = omap2_clk_round_rate(clk, rate); |
| 588 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 589 | |
| 590 | return ret; |
| 591 | } |
| 592 | EXPORT_SYMBOL(clk_round_rate); |
| 593 | |
| 594 | int clk_set_rate(struct clk *clk, unsigned long rate) |
| 595 | { |
| 596 | unsigned long flags; |
| 597 | int ret = -EINVAL; |
| 598 | |
| 599 | if (clk == NULL || IS_ERR(clk)) |
| 600 | return ret; |
| 601 | |
| 602 | spin_lock_irqsave(&clockfw_lock, flags); |
| 603 | ret = omap2_clk_set_rate(clk, rate); |
| 604 | if (ret == 0) |
| 605 | propagate_rate(clk); |
| 606 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 607 | |
| 608 | return ret; |
| 609 | } |
| 610 | EXPORT_SYMBOL(clk_set_rate); |
| 611 | |
| 612 | int clk_set_parent(struct clk *clk, struct clk *parent) |
| 613 | { |
| 614 | unsigned long flags; |
| 615 | int ret = -EINVAL; |
| 616 | |
| 617 | if (clk == NULL || IS_ERR(clk) || parent == NULL || IS_ERR(parent)) |
| 618 | return ret; |
| 619 | |
| 620 | spin_lock_irqsave(&clockfw_lock, flags); |
| 621 | if (clk->usecount == 0) { |
| 622 | ret = omap2_clk_set_parent(clk, parent); |
| 623 | if (ret == 0) |
| 624 | propagate_rate(clk); |
| 625 | } else { |
| 626 | ret = -EBUSY; |
| 627 | } |
| 628 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 629 | |
| 630 | return ret; |
| 631 | } |
| 632 | EXPORT_SYMBOL(clk_set_parent); |
| 633 | |
| 634 | struct clk *clk_get_parent(struct clk *clk) |
| 635 | { |
| 636 | return clk->parent; |
| 637 | } |
| 638 | EXPORT_SYMBOL(clk_get_parent); |
| 639 | |
| 640 | /* |
| 641 | * OMAP specific clock functions shared between omap1 and omap2 |
| 642 | */ |
| 643 | |
| 644 | int __initdata mpurate; |
| 645 | |
| 646 | /* |
| 647 | * By default we use the rate set by the bootloader. |
| 648 | * You can override this with mpurate= cmdline option. |
| 649 | */ |
| 650 | static int __init omap_clk_setup(char *str) |
| 651 | { |
| 652 | get_option(&str, &mpurate); |
| 653 | |
| 654 | if (!mpurate) |
| 655 | return 1; |
| 656 | |
| 657 | if (mpurate < 1000) |
| 658 | mpurate *= 1000000; |
| 659 | |
| 660 | return 1; |
| 661 | } |
| 662 | __setup("mpurate=", omap_clk_setup); |
| 663 | |
| 664 | /* Used for clocks that always have same value as the parent clock */ |
| 665 | unsigned long followparent_recalc(struct clk *clk) |
| 666 | { |
| 667 | return clk->parent->rate; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * Used for clocks that have the same value as the parent clock, |
| 672 | * divided by some factor |
| 673 | */ |
| 674 | unsigned long omap_fixed_divisor_recalc(struct clk *clk) |
| 675 | { |
| 676 | WARN_ON(!clk->fixed_div); |
| 677 | |
| 678 | return clk->parent->rate / clk->fixed_div; |
| 679 | } |
| 680 | |
| 681 | void clk_reparent(struct clk *child, struct clk *parent) |
| 682 | { |
| 683 | list_del_init(&child->sibling); |
| 684 | if (parent) |
| 685 | list_add(&child->sibling, &parent->children); |
| 686 | child->parent = parent; |
| 687 | |
| 688 | /* now do the debugfs renaming to reattach the child |
| 689 | to the proper parent */ |
| 690 | } |
| 691 | |
| 692 | /* Propagate rate to children */ |
| 693 | void propagate_rate(struct clk *tclk) |
| 694 | { |
| 695 | struct clk *clkp; |
| 696 | |
| 697 | list_for_each_entry(clkp, &tclk->children, sibling) { |
| 698 | if (clkp->recalc) |
| 699 | clkp->rate = clkp->recalc(clkp); |
| 700 | propagate_rate(clkp); |
| 701 | } |
| 702 | } |
| 703 | |
| 704 | static LIST_HEAD(root_clks); |
| 705 | |
| 706 | /** |
| 707 | * recalculate_root_clocks - recalculate and propagate all root clocks |
| 708 | * |
| 709 | * Recalculates all root clocks (clocks with no parent), which if the |
| 710 | * clock's .recalc is set correctly, should also propagate their rates. |
| 711 | * Called at init. |
| 712 | */ |
| 713 | void recalculate_root_clocks(void) |
| 714 | { |
| 715 | struct clk *clkp; |
| 716 | |
| 717 | list_for_each_entry(clkp, &root_clks, sibling) { |
| 718 | if (clkp->recalc) |
| 719 | clkp->rate = clkp->recalc(clkp); |
| 720 | propagate_rate(clkp); |
| 721 | } |
| 722 | } |
| 723 | |
| 724 | /** |
| 725 | * clk_preinit - initialize any fields in the struct clk before clk init |
| 726 | * @clk: struct clk * to initialize |
| 727 | * |
| 728 | * Initialize any struct clk fields needed before normal clk initialization |
| 729 | * can run. No return value. |
| 730 | */ |
| 731 | void clk_preinit(struct clk *clk) |
| 732 | { |
| 733 | INIT_LIST_HEAD(&clk->children); |
| 734 | } |
| 735 | |
| 736 | int clk_register(struct clk *clk) |
| 737 | { |
| 738 | if (clk == NULL || IS_ERR(clk)) |
| 739 | return -EINVAL; |
| 740 | |
| 741 | /* |
| 742 | * trap out already registered clocks |
| 743 | */ |
| 744 | if (clk->node.next || clk->node.prev) |
| 745 | return 0; |
| 746 | |
| 747 | mutex_lock(&clocks_mutex); |
| 748 | if (clk->parent) |
| 749 | list_add(&clk->sibling, &clk->parent->children); |
| 750 | else |
| 751 | list_add(&clk->sibling, &root_clks); |
| 752 | |
| 753 | list_add(&clk->node, &clocks); |
| 754 | if (clk->init) |
| 755 | clk->init(clk); |
| 756 | mutex_unlock(&clocks_mutex); |
| 757 | |
| 758 | return 0; |
| 759 | } |
| 760 | EXPORT_SYMBOL(clk_register); |
| 761 | |
| 762 | void clk_unregister(struct clk *clk) |
| 763 | { |
| 764 | if (clk == NULL || IS_ERR(clk)) |
| 765 | return; |
| 766 | |
| 767 | mutex_lock(&clocks_mutex); |
| 768 | list_del(&clk->sibling); |
| 769 | list_del(&clk->node); |
| 770 | mutex_unlock(&clocks_mutex); |
| 771 | } |
| 772 | EXPORT_SYMBOL(clk_unregister); |
| 773 | |
| 774 | void clk_enable_init_clocks(void) |
| 775 | { |
| 776 | struct clk *clkp; |
| 777 | |
| 778 | list_for_each_entry(clkp, &clocks, node) |
| 779 | if (clkp->flags & ENABLE_ON_INIT) |
| 780 | clk_enable(clkp); |
| 781 | } |
| 782 | |
| 783 | /** |
| 784 | * omap_clk_get_by_name - locate OMAP struct clk by its name |
| 785 | * @name: name of the struct clk to locate |
| 786 | * |
| 787 | * Locate an OMAP struct clk by its name. Assumes that struct clk |
| 788 | * names are unique. Returns NULL if not found or a pointer to the |
| 789 | * struct clk if found. |
| 790 | */ |
| 791 | struct clk *omap_clk_get_by_name(const char *name) |
| 792 | { |
| 793 | struct clk *c; |
| 794 | struct clk *ret = NULL; |
| 795 | |
| 796 | mutex_lock(&clocks_mutex); |
| 797 | |
| 798 | list_for_each_entry(c, &clocks, node) { |
| 799 | if (!strcmp(c->name, name)) { |
| 800 | ret = c; |
| 801 | break; |
| 802 | } |
| 803 | } |
| 804 | |
| 805 | mutex_unlock(&clocks_mutex); |
| 806 | |
| 807 | return ret; |
| 808 | } |
| 809 | |
| 810 | int omap_clk_enable_autoidle_all(void) |
| 811 | { |
| 812 | struct clk *c; |
| 813 | unsigned long flags; |
| 814 | |
| 815 | spin_lock_irqsave(&clockfw_lock, flags); |
| 816 | |
| 817 | list_for_each_entry(c, &clocks, node) |
| 818 | if (c->ops->allow_idle) |
| 819 | c->ops->allow_idle(c); |
| 820 | |
| 821 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 822 | |
| 823 | return 0; |
| 824 | } |
| 825 | |
| 826 | int omap_clk_disable_autoidle_all(void) |
| 827 | { |
| 828 | struct clk *c; |
| 829 | unsigned long flags; |
| 830 | |
| 831 | spin_lock_irqsave(&clockfw_lock, flags); |
| 832 | |
| 833 | list_for_each_entry(c, &clocks, node) |
| 834 | if (c->ops->deny_idle) |
| 835 | c->ops->deny_idle(c); |
| 836 | |
| 837 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 838 | |
| 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | /* |
| 843 | * Low level helpers |
| 844 | */ |
| 845 | static int clkll_enable_null(struct clk *clk) |
| 846 | { |
| 847 | return 0; |
| 848 | } |
| 849 | |
| 850 | static void clkll_disable_null(struct clk *clk) |
| 851 | { |
| 852 | } |
| 853 | |
| 854 | const struct clkops clkops_null = { |
| 855 | .enable = clkll_enable_null, |
| 856 | .disable = clkll_disable_null, |
Paul Walmsley | 69ecefc | 2010-01-26 20:13:04 -0700 | [diff] [blame] | 857 | }; |
| 858 | |
Paul Walmsley | 1fe9be8 | 2012-09-27 10:33:33 -0600 | [diff] [blame] | 859 | /* |
| 860 | * Dummy clock |
| 861 | * |
| 862 | * Used for clock aliases that are needed on some OMAPs, but not others |
| 863 | */ |
| 864 | struct clk dummy_ck = { |
| 865 | .name = "dummy", |
| 866 | .ops = &clkops_null, |
| 867 | }; |
| 868 | |
| 869 | /* |
| 870 | * |
| 871 | */ |
| 872 | |
| 873 | #ifdef CONFIG_OMAP_RESET_CLOCKS |
| 874 | /* |
| 875 | * Disable any unused clocks left on by the bootloader |
| 876 | */ |
| 877 | static int __init clk_disable_unused(void) |
| 878 | { |
| 879 | struct clk *ck; |
| 880 | unsigned long flags; |
| 881 | |
| 882 | pr_info("clock: disabling unused clocks to save power\n"); |
| 883 | |
| 884 | spin_lock_irqsave(&clockfw_lock, flags); |
| 885 | list_for_each_entry(ck, &clocks, node) { |
| 886 | if (ck->ops == &clkops_null) |
| 887 | continue; |
| 888 | |
| 889 | if (ck->usecount > 0 || !ck->enable_reg) |
| 890 | continue; |
| 891 | |
| 892 | omap2_clk_disable_unused(ck); |
| 893 | } |
| 894 | spin_unlock_irqrestore(&clockfw_lock, flags); |
| 895 | |
| 896 | return 0; |
| 897 | } |
| 898 | late_initcall(clk_disable_unused); |
| 899 | late_initcall(omap_clk_enable_autoidle_all); |
| 900 | #endif |
| 901 | |
| 902 | #if defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) |
| 903 | /* |
| 904 | * debugfs support to trace clock tree hierarchy and attributes |
| 905 | */ |
| 906 | |
| 907 | #include <linux/debugfs.h> |
| 908 | #include <linux/seq_file.h> |
| 909 | |
| 910 | static struct dentry *clk_debugfs_root; |
| 911 | |
| 912 | static int clk_dbg_show_summary(struct seq_file *s, void *unused) |
| 913 | { |
| 914 | struct clk *c; |
| 915 | struct clk *pa; |
| 916 | |
| 917 | mutex_lock(&clocks_mutex); |
| 918 | seq_printf(s, "%-30s %-30s %-10s %s\n", |
| 919 | "clock-name", "parent-name", "rate", "use-count"); |
| 920 | |
| 921 | list_for_each_entry(c, &clocks, node) { |
| 922 | pa = c->parent; |
| 923 | seq_printf(s, "%-30s %-30s %-10lu %d\n", |
| 924 | c->name, pa ? pa->name : "none", c->rate, |
| 925 | c->usecount); |
| 926 | } |
| 927 | mutex_unlock(&clocks_mutex); |
| 928 | |
| 929 | return 0; |
| 930 | } |
| 931 | |
| 932 | static int clk_dbg_open(struct inode *inode, struct file *file) |
| 933 | { |
| 934 | return single_open(file, clk_dbg_show_summary, inode->i_private); |
| 935 | } |
| 936 | |
| 937 | static const struct file_operations debug_clock_fops = { |
| 938 | .open = clk_dbg_open, |
| 939 | .read = seq_read, |
| 940 | .llseek = seq_lseek, |
| 941 | .release = single_release, |
| 942 | }; |
| 943 | |
| 944 | static int clk_debugfs_register_one(struct clk *c) |
| 945 | { |
| 946 | int err; |
| 947 | struct dentry *d; |
| 948 | struct clk *pa = c->parent; |
| 949 | |
| 950 | d = debugfs_create_dir(c->name, pa ? pa->dent : clk_debugfs_root); |
| 951 | if (!d) |
| 952 | return -ENOMEM; |
| 953 | c->dent = d; |
| 954 | |
| 955 | d = debugfs_create_u8("usecount", S_IRUGO, c->dent, (u8 *)&c->usecount); |
| 956 | if (!d) { |
| 957 | err = -ENOMEM; |
| 958 | goto err_out; |
| 959 | } |
| 960 | d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate); |
| 961 | if (!d) { |
| 962 | err = -ENOMEM; |
| 963 | goto err_out; |
| 964 | } |
| 965 | d = debugfs_create_x32("flags", S_IRUGO, c->dent, (u32 *)&c->flags); |
| 966 | if (!d) { |
| 967 | err = -ENOMEM; |
| 968 | goto err_out; |
| 969 | } |
| 970 | return 0; |
| 971 | |
| 972 | err_out: |
| 973 | debugfs_remove_recursive(c->dent); |
| 974 | return err; |
| 975 | } |
| 976 | |
| 977 | static int clk_debugfs_register(struct clk *c) |
| 978 | { |
| 979 | int err; |
| 980 | struct clk *pa = c->parent; |
| 981 | |
| 982 | if (pa && !pa->dent) { |
| 983 | err = clk_debugfs_register(pa); |
| 984 | if (err) |
| 985 | return err; |
| 986 | } |
| 987 | |
| 988 | if (!c->dent) { |
| 989 | err = clk_debugfs_register_one(c); |
| 990 | if (err) |
| 991 | return err; |
| 992 | } |
| 993 | return 0; |
| 994 | } |
| 995 | |
| 996 | static int __init clk_debugfs_init(void) |
| 997 | { |
| 998 | struct clk *c; |
| 999 | struct dentry *d; |
| 1000 | int err; |
| 1001 | |
| 1002 | d = debugfs_create_dir("clock", NULL); |
| 1003 | if (!d) |
| 1004 | return -ENOMEM; |
| 1005 | clk_debugfs_root = d; |
| 1006 | |
| 1007 | list_for_each_entry(c, &clocks, node) { |
| 1008 | err = clk_debugfs_register(c); |
| 1009 | if (err) |
| 1010 | goto err_out; |
| 1011 | } |
| 1012 | |
| 1013 | d = debugfs_create_file("summary", S_IRUGO, |
| 1014 | d, NULL, &debug_clock_fops); |
| 1015 | if (!d) |
| 1016 | return -ENOMEM; |
| 1017 | |
| 1018 | return 0; |
| 1019 | err_out: |
| 1020 | debugfs_remove_recursive(clk_debugfs_root); |
| 1021 | return err; |
| 1022 | } |
| 1023 | late_initcall(clk_debugfs_init); |
| 1024 | |
| 1025 | #endif /* defined(CONFIG_PM_DEBUG) && defined(CONFIG_DEBUG_FS) */ |
| 1026 | |