Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 1 | /* |
| 2 | * SuperH Timer Support - CMT |
| 3 | * |
| 4 | * Copyright (C) 2008 Magnus Damm |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; either version 2 of the License |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | #include <linux/init.h> |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/spinlock.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/ioport.h> |
| 25 | #include <linux/io.h> |
| 26 | #include <linux/clk.h> |
| 27 | #include <linux/irq.h> |
| 28 | #include <linux/err.h> |
Magnus Damm | 3f7e5e2 | 2011-07-13 07:59:48 +0000 | [diff] [blame] | 29 | #include <linux/delay.h> |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 30 | #include <linux/clocksource.h> |
| 31 | #include <linux/clockchips.h> |
Paul Mundt | 46a12f7 | 2009-05-03 17:57:17 +0900 | [diff] [blame] | 32 | #include <linux/sh_timer.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 33 | #include <linux/slab.h> |
Paul Gortmaker | 7deeab5 | 2011-07-03 13:36:22 -0400 | [diff] [blame] | 34 | #include <linux/module.h> |
Rafael J. Wysocki | 615a445 | 2012-03-13 22:40:06 +0100 | [diff] [blame] | 35 | #include <linux/pm_domain.h> |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 36 | #include <linux/pm_runtime.h> |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 37 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 38 | struct sh_cmt_device; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 39 | |
| 40 | struct sh_cmt_channel { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 41 | struct sh_cmt_device *cmt; |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 42 | unsigned int index; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 43 | |
Laurent Pinchart | c924d2d | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 44 | void __iomem *base; |
| 45 | |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 46 | unsigned long flags; |
| 47 | unsigned long match_value; |
| 48 | unsigned long next_match_value; |
| 49 | unsigned long max_match_value; |
| 50 | unsigned long rate; |
Paul Mundt | 7d0c399 | 2012-05-25 13:36:43 +0900 | [diff] [blame] | 51 | raw_spinlock_t lock; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 52 | struct clock_event_device ced; |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 53 | struct clocksource cs; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 54 | unsigned long total_cycles; |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 55 | bool cs_enabled; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 56 | }; |
| 57 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 58 | struct sh_cmt_device { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 59 | struct platform_device *pdev; |
| 60 | |
Laurent Pinchart | 36f1ac9 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 61 | void __iomem *mapbase_ch; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 62 | void __iomem *mapbase; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 63 | struct clk *clk; |
| 64 | |
| 65 | struct sh_cmt_channel channel; |
| 66 | |
| 67 | unsigned long width; /* 16 or 32 bit version of hardware block */ |
| 68 | unsigned long overflow_bit; |
| 69 | unsigned long clear_bits; |
Magnus Damm | a6a912c | 2012-12-14 14:54:19 +0900 | [diff] [blame] | 70 | |
Magnus Damm | cccd704 | 2012-12-14 14:54:28 +0900 | [diff] [blame] | 71 | /* callbacks for CMSTR and CMCSR access */ |
| 72 | unsigned long (*read_control)(void __iomem *base, unsigned long offs); |
| 73 | void (*write_control)(void __iomem *base, unsigned long offs, |
| 74 | unsigned long value); |
| 75 | |
Magnus Damm | a6a912c | 2012-12-14 14:54:19 +0900 | [diff] [blame] | 76 | /* callbacks for CMCNT and CMCOR access */ |
| 77 | unsigned long (*read_count)(void __iomem *base, unsigned long offs); |
| 78 | void (*write_count)(void __iomem *base, unsigned long offs, |
| 79 | unsigned long value); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 80 | }; |
| 81 | |
Magnus Damm | 118aee4 | 2012-12-14 14:54:37 +0900 | [diff] [blame] | 82 | /* Examples of supported CMT timer register layouts and I/O access widths: |
| 83 | * |
| 84 | * "16-bit counter and 16-bit control" as found on sh7263: |
| 85 | * CMSTR 0xfffec000 16-bit |
| 86 | * CMCSR 0xfffec002 16-bit |
| 87 | * CMCNT 0xfffec004 16-bit |
| 88 | * CMCOR 0xfffec006 16-bit |
| 89 | * |
| 90 | * "32-bit counter and 16-bit control" as found on sh7372, sh73a0, r8a7740: |
| 91 | * CMSTR 0xffca0000 16-bit |
| 92 | * CMCSR 0xffca0060 16-bit |
| 93 | * CMCNT 0xffca0064 32-bit |
| 94 | * CMCOR 0xffca0068 32-bit |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 95 | * |
| 96 | * "32-bit counter and 32-bit control" as found on r8a73a4 and r8a7790: |
| 97 | * CMSTR 0xffca0500 32-bit |
| 98 | * CMCSR 0xffca0510 32-bit |
| 99 | * CMCNT 0xffca0514 32-bit |
| 100 | * CMCOR 0xffca0518 32-bit |
Magnus Damm | 118aee4 | 2012-12-14 14:54:37 +0900 | [diff] [blame] | 101 | */ |
| 102 | |
Magnus Damm | a6a912c | 2012-12-14 14:54:19 +0900 | [diff] [blame] | 103 | static unsigned long sh_cmt_read16(void __iomem *base, unsigned long offs) |
Magnus Damm | 587acb3 | 2012-12-14 14:54:10 +0900 | [diff] [blame] | 104 | { |
| 105 | return ioread16(base + (offs << 1)); |
| 106 | } |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 107 | |
Magnus Damm | a6a912c | 2012-12-14 14:54:19 +0900 | [diff] [blame] | 108 | static unsigned long sh_cmt_read32(void __iomem *base, unsigned long offs) |
| 109 | { |
| 110 | return ioread32(base + (offs << 2)); |
| 111 | } |
| 112 | |
| 113 | static void sh_cmt_write16(void __iomem *base, unsigned long offs, |
| 114 | unsigned long value) |
Magnus Damm | 587acb3 | 2012-12-14 14:54:10 +0900 | [diff] [blame] | 115 | { |
| 116 | iowrite16(value, base + (offs << 1)); |
| 117 | } |
| 118 | |
Magnus Damm | a6a912c | 2012-12-14 14:54:19 +0900 | [diff] [blame] | 119 | static void sh_cmt_write32(void __iomem *base, unsigned long offs, |
| 120 | unsigned long value) |
| 121 | { |
| 122 | iowrite32(value, base + (offs << 2)); |
| 123 | } |
| 124 | |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 125 | #define CMCSR 0 /* channel register */ |
| 126 | #define CMCNT 1 /* channel register */ |
| 127 | #define CMCOR 2 /* channel register */ |
| 128 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 129 | static inline unsigned long sh_cmt_read_cmstr(struct sh_cmt_channel *ch) |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 130 | { |
Laurent Pinchart | 36f1ac9 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 131 | return ch->cmt->read_control(ch->cmt->mapbase, 0); |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 132 | } |
| 133 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 134 | static inline unsigned long sh_cmt_read_cmcsr(struct sh_cmt_channel *ch) |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 135 | { |
Laurent Pinchart | c924d2d | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 136 | return ch->cmt->read_control(ch->base, CMCSR); |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 137 | } |
| 138 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 139 | static inline unsigned long sh_cmt_read_cmcnt(struct sh_cmt_channel *ch) |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 140 | { |
Laurent Pinchart | c924d2d | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 141 | return ch->cmt->read_count(ch->base, CMCNT); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 142 | } |
| 143 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 144 | static inline void sh_cmt_write_cmstr(struct sh_cmt_channel *ch, |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 145 | unsigned long value) |
| 146 | { |
Laurent Pinchart | 36f1ac9 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 147 | ch->cmt->write_control(ch->cmt->mapbase, 0, value); |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 148 | } |
| 149 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 150 | static inline void sh_cmt_write_cmcsr(struct sh_cmt_channel *ch, |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 151 | unsigned long value) |
| 152 | { |
Laurent Pinchart | c924d2d | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 153 | ch->cmt->write_control(ch->base, CMCSR, value); |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 154 | } |
| 155 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 156 | static inline void sh_cmt_write_cmcnt(struct sh_cmt_channel *ch, |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 157 | unsigned long value) |
| 158 | { |
Laurent Pinchart | c924d2d | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 159 | ch->cmt->write_count(ch->base, CMCNT, value); |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 160 | } |
| 161 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 162 | static inline void sh_cmt_write_cmcor(struct sh_cmt_channel *ch, |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 163 | unsigned long value) |
| 164 | { |
Laurent Pinchart | c924d2d | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 165 | ch->cmt->write_count(ch->base, CMCOR, value); |
Magnus Damm | 1b56b96 | 2012-12-14 14:54:00 +0900 | [diff] [blame] | 166 | } |
| 167 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 168 | static unsigned long sh_cmt_get_counter(struct sh_cmt_channel *ch, |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 169 | int *has_wrapped) |
| 170 | { |
| 171 | unsigned long v1, v2, v3; |
Magnus Damm | 5b644c7 | 2009-04-28 08:17:54 +0000 | [diff] [blame] | 172 | int o1, o2; |
| 173 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 174 | o1 = sh_cmt_read_cmcsr(ch) & ch->cmt->overflow_bit; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 175 | |
| 176 | /* Make sure the timer value is stable. Stolen from acpi_pm.c */ |
| 177 | do { |
Magnus Damm | 5b644c7 | 2009-04-28 08:17:54 +0000 | [diff] [blame] | 178 | o2 = o1; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 179 | v1 = sh_cmt_read_cmcnt(ch); |
| 180 | v2 = sh_cmt_read_cmcnt(ch); |
| 181 | v3 = sh_cmt_read_cmcnt(ch); |
| 182 | o1 = sh_cmt_read_cmcsr(ch) & ch->cmt->overflow_bit; |
Magnus Damm | 5b644c7 | 2009-04-28 08:17:54 +0000 | [diff] [blame] | 183 | } while (unlikely((o1 != o2) || (v1 > v2 && v1 < v3) |
| 184 | || (v2 > v3 && v2 < v1) || (v3 > v1 && v3 < v2))); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 185 | |
Magnus Damm | 5b644c7 | 2009-04-28 08:17:54 +0000 | [diff] [blame] | 186 | *has_wrapped = o1; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 187 | return v2; |
| 188 | } |
| 189 | |
Magnus Damm | 587acb3 | 2012-12-14 14:54:10 +0900 | [diff] [blame] | 190 | static DEFINE_RAW_SPINLOCK(sh_cmt_lock); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 191 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 192 | static void sh_cmt_start_stop_ch(struct sh_cmt_channel *ch, int start) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 193 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 194 | struct sh_timer_config *cfg = ch->cmt->pdev->dev.platform_data; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 195 | unsigned long flags, value; |
| 196 | |
| 197 | /* start stop register shared by multiple timer channels */ |
Paul Mundt | 7d0c399 | 2012-05-25 13:36:43 +0900 | [diff] [blame] | 198 | raw_spin_lock_irqsave(&sh_cmt_lock, flags); |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 199 | value = sh_cmt_read_cmstr(ch); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 200 | |
| 201 | if (start) |
| 202 | value |= 1 << cfg->timer_bit; |
| 203 | else |
| 204 | value &= ~(1 << cfg->timer_bit); |
| 205 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 206 | sh_cmt_write_cmstr(ch, value); |
Paul Mundt | 7d0c399 | 2012-05-25 13:36:43 +0900 | [diff] [blame] | 207 | raw_spin_unlock_irqrestore(&sh_cmt_lock, flags); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 208 | } |
| 209 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 210 | static int sh_cmt_enable(struct sh_cmt_channel *ch, unsigned long *rate) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 211 | { |
Magnus Damm | 3f7e5e2 | 2011-07-13 07:59:48 +0000 | [diff] [blame] | 212 | int k, ret; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 213 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 214 | pm_runtime_get_sync(&ch->cmt->pdev->dev); |
| 215 | dev_pm_syscore_device(&ch->cmt->pdev->dev, true); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 216 | |
Paul Mundt | 9436b4a | 2011-05-31 15:26:42 +0900 | [diff] [blame] | 217 | /* enable clock */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 218 | ret = clk_enable(ch->cmt->clk); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 219 | if (ret) { |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 220 | dev_err(&ch->cmt->pdev->dev, "ch%u: cannot enable clock\n", |
| 221 | ch->index); |
Magnus Damm | 3f7e5e2 | 2011-07-13 07:59:48 +0000 | [diff] [blame] | 222 | goto err0; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 223 | } |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 224 | |
| 225 | /* make sure channel is disabled */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 226 | sh_cmt_start_stop_ch(ch, 0); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 227 | |
| 228 | /* configure channel, periodic mode and maximum timeout */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 229 | if (ch->cmt->width == 16) { |
| 230 | *rate = clk_get_rate(ch->cmt->clk) / 512; |
| 231 | sh_cmt_write_cmcsr(ch, 0x43); |
Magnus Damm | 3014f47 | 2009-04-29 14:50:37 +0000 | [diff] [blame] | 232 | } else { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 233 | *rate = clk_get_rate(ch->cmt->clk) / 8; |
| 234 | sh_cmt_write_cmcsr(ch, 0x01a4); |
Magnus Damm | 3014f47 | 2009-04-29 14:50:37 +0000 | [diff] [blame] | 235 | } |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 236 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 237 | sh_cmt_write_cmcor(ch, 0xffffffff); |
| 238 | sh_cmt_write_cmcnt(ch, 0); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 239 | |
Magnus Damm | 3f7e5e2 | 2011-07-13 07:59:48 +0000 | [diff] [blame] | 240 | /* |
| 241 | * According to the sh73a0 user's manual, as CMCNT can be operated |
| 242 | * only by the RCLK (Pseudo 32 KHz), there's one restriction on |
| 243 | * modifying CMCNT register; two RCLK cycles are necessary before |
| 244 | * this register is either read or any modification of the value |
| 245 | * it holds is reflected in the LSI's actual operation. |
| 246 | * |
| 247 | * While at it, we're supposed to clear out the CMCNT as of this |
| 248 | * moment, so make sure it's processed properly here. This will |
| 249 | * take RCLKx2 at maximum. |
| 250 | */ |
| 251 | for (k = 0; k < 100; k++) { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 252 | if (!sh_cmt_read_cmcnt(ch)) |
Magnus Damm | 3f7e5e2 | 2011-07-13 07:59:48 +0000 | [diff] [blame] | 253 | break; |
| 254 | udelay(1); |
| 255 | } |
| 256 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 257 | if (sh_cmt_read_cmcnt(ch)) { |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 258 | dev_err(&ch->cmt->pdev->dev, "ch%u: cannot clear CMCNT\n", |
| 259 | ch->index); |
Magnus Damm | 3f7e5e2 | 2011-07-13 07:59:48 +0000 | [diff] [blame] | 260 | ret = -ETIMEDOUT; |
| 261 | goto err1; |
| 262 | } |
| 263 | |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 264 | /* enable channel */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 265 | sh_cmt_start_stop_ch(ch, 1); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 266 | return 0; |
Magnus Damm | 3f7e5e2 | 2011-07-13 07:59:48 +0000 | [diff] [blame] | 267 | err1: |
| 268 | /* stop clock */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 269 | clk_disable(ch->cmt->clk); |
Magnus Damm | 3f7e5e2 | 2011-07-13 07:59:48 +0000 | [diff] [blame] | 270 | |
| 271 | err0: |
| 272 | return ret; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 273 | } |
| 274 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 275 | static void sh_cmt_disable(struct sh_cmt_channel *ch) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 276 | { |
| 277 | /* disable channel */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 278 | sh_cmt_start_stop_ch(ch, 0); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 279 | |
Magnus Damm | be890a1 | 2009-06-17 05:04:04 +0000 | [diff] [blame] | 280 | /* disable interrupts in CMT block */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 281 | sh_cmt_write_cmcsr(ch, 0); |
Magnus Damm | be890a1 | 2009-06-17 05:04:04 +0000 | [diff] [blame] | 282 | |
Paul Mundt | 9436b4a | 2011-05-31 15:26:42 +0900 | [diff] [blame] | 283 | /* stop clock */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 284 | clk_disable(ch->cmt->clk); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 285 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 286 | dev_pm_syscore_device(&ch->cmt->pdev->dev, false); |
| 287 | pm_runtime_put(&ch->cmt->pdev->dev); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 288 | } |
| 289 | |
| 290 | /* private flags */ |
| 291 | #define FLAG_CLOCKEVENT (1 << 0) |
| 292 | #define FLAG_CLOCKSOURCE (1 << 1) |
| 293 | #define FLAG_REPROGRAM (1 << 2) |
| 294 | #define FLAG_SKIPEVENT (1 << 3) |
| 295 | #define FLAG_IRQCONTEXT (1 << 4) |
| 296 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 297 | static void sh_cmt_clock_event_program_verify(struct sh_cmt_channel *ch, |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 298 | int absolute) |
| 299 | { |
| 300 | unsigned long new_match; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 301 | unsigned long value = ch->next_match_value; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 302 | unsigned long delay = 0; |
| 303 | unsigned long now = 0; |
| 304 | int has_wrapped; |
| 305 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 306 | now = sh_cmt_get_counter(ch, &has_wrapped); |
| 307 | ch->flags |= FLAG_REPROGRAM; /* force reprogram */ |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 308 | |
| 309 | if (has_wrapped) { |
| 310 | /* we're competing with the interrupt handler. |
| 311 | * -> let the interrupt handler reprogram the timer. |
| 312 | * -> interrupt number two handles the event. |
| 313 | */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 314 | ch->flags |= FLAG_SKIPEVENT; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 315 | return; |
| 316 | } |
| 317 | |
| 318 | if (absolute) |
| 319 | now = 0; |
| 320 | |
| 321 | do { |
| 322 | /* reprogram the timer hardware, |
| 323 | * but don't save the new match value yet. |
| 324 | */ |
| 325 | new_match = now + value + delay; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 326 | if (new_match > ch->max_match_value) |
| 327 | new_match = ch->max_match_value; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 328 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 329 | sh_cmt_write_cmcor(ch, new_match); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 330 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 331 | now = sh_cmt_get_counter(ch, &has_wrapped); |
| 332 | if (has_wrapped && (new_match > ch->match_value)) { |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 333 | /* we are changing to a greater match value, |
| 334 | * so this wrap must be caused by the counter |
| 335 | * matching the old value. |
| 336 | * -> first interrupt reprograms the timer. |
| 337 | * -> interrupt number two handles the event. |
| 338 | */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 339 | ch->flags |= FLAG_SKIPEVENT; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 340 | break; |
| 341 | } |
| 342 | |
| 343 | if (has_wrapped) { |
| 344 | /* we are changing to a smaller match value, |
| 345 | * so the wrap must be caused by the counter |
| 346 | * matching the new value. |
| 347 | * -> save programmed match value. |
| 348 | * -> let isr handle the event. |
| 349 | */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 350 | ch->match_value = new_match; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 351 | break; |
| 352 | } |
| 353 | |
| 354 | /* be safe: verify hardware settings */ |
| 355 | if (now < new_match) { |
| 356 | /* timer value is below match value, all good. |
| 357 | * this makes sure we won't miss any match events. |
| 358 | * -> save programmed match value. |
| 359 | * -> let isr handle the event. |
| 360 | */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 361 | ch->match_value = new_match; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 362 | break; |
| 363 | } |
| 364 | |
| 365 | /* the counter has reached a value greater |
| 366 | * than our new match value. and since the |
| 367 | * has_wrapped flag isn't set we must have |
| 368 | * programmed a too close event. |
| 369 | * -> increase delay and retry. |
| 370 | */ |
| 371 | if (delay) |
| 372 | delay <<= 1; |
| 373 | else |
| 374 | delay = 1; |
| 375 | |
| 376 | if (!delay) |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 377 | dev_warn(&ch->cmt->pdev->dev, "ch%u: too long delay\n", |
| 378 | ch->index); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 379 | |
| 380 | } while (delay); |
| 381 | } |
| 382 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 383 | static void __sh_cmt_set_next(struct sh_cmt_channel *ch, unsigned long delta) |
Takashi YOSHII | 65ada54 | 2010-12-17 07:25:09 +0000 | [diff] [blame] | 384 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 385 | if (delta > ch->max_match_value) |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 386 | dev_warn(&ch->cmt->pdev->dev, "ch%u: delta out of range\n", |
| 387 | ch->index); |
Takashi YOSHII | 65ada54 | 2010-12-17 07:25:09 +0000 | [diff] [blame] | 388 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 389 | ch->next_match_value = delta; |
| 390 | sh_cmt_clock_event_program_verify(ch, 0); |
Takashi YOSHII | 65ada54 | 2010-12-17 07:25:09 +0000 | [diff] [blame] | 391 | } |
| 392 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 393 | static void sh_cmt_set_next(struct sh_cmt_channel *ch, unsigned long delta) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 394 | { |
| 395 | unsigned long flags; |
| 396 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 397 | raw_spin_lock_irqsave(&ch->lock, flags); |
| 398 | __sh_cmt_set_next(ch, delta); |
| 399 | raw_spin_unlock_irqrestore(&ch->lock, flags); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | static irqreturn_t sh_cmt_interrupt(int irq, void *dev_id) |
| 403 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 404 | struct sh_cmt_channel *ch = dev_id; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 405 | |
| 406 | /* clear flags */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 407 | sh_cmt_write_cmcsr(ch, sh_cmt_read_cmcsr(ch) & ch->cmt->clear_bits); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 408 | |
| 409 | /* update clock source counter to begin with if enabled |
| 410 | * the wrap flag should be cleared by the timer specific |
| 411 | * isr before we end up here. |
| 412 | */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 413 | if (ch->flags & FLAG_CLOCKSOURCE) |
| 414 | ch->total_cycles += ch->match_value + 1; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 415 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 416 | if (!(ch->flags & FLAG_REPROGRAM)) |
| 417 | ch->next_match_value = ch->max_match_value; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 418 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 419 | ch->flags |= FLAG_IRQCONTEXT; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 420 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 421 | if (ch->flags & FLAG_CLOCKEVENT) { |
| 422 | if (!(ch->flags & FLAG_SKIPEVENT)) { |
| 423 | if (ch->ced.mode == CLOCK_EVT_MODE_ONESHOT) { |
| 424 | ch->next_match_value = ch->max_match_value; |
| 425 | ch->flags |= FLAG_REPROGRAM; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 426 | } |
| 427 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 428 | ch->ced.event_handler(&ch->ced); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 429 | } |
| 430 | } |
| 431 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 432 | ch->flags &= ~FLAG_SKIPEVENT; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 433 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 434 | if (ch->flags & FLAG_REPROGRAM) { |
| 435 | ch->flags &= ~FLAG_REPROGRAM; |
| 436 | sh_cmt_clock_event_program_verify(ch, 1); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 437 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 438 | if (ch->flags & FLAG_CLOCKEVENT) |
| 439 | if ((ch->ced.mode == CLOCK_EVT_MODE_SHUTDOWN) |
| 440 | || (ch->match_value == ch->next_match_value)) |
| 441 | ch->flags &= ~FLAG_REPROGRAM; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 442 | } |
| 443 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 444 | ch->flags &= ~FLAG_IRQCONTEXT; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 445 | |
| 446 | return IRQ_HANDLED; |
| 447 | } |
| 448 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 449 | static int sh_cmt_start(struct sh_cmt_channel *ch, unsigned long flag) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 450 | { |
| 451 | int ret = 0; |
| 452 | unsigned long flags; |
| 453 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 454 | raw_spin_lock_irqsave(&ch->lock, flags); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 455 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 456 | if (!(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) |
| 457 | ret = sh_cmt_enable(ch, &ch->rate); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 458 | |
| 459 | if (ret) |
| 460 | goto out; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 461 | ch->flags |= flag; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 462 | |
| 463 | /* setup timeout if no clockevent */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 464 | if ((flag == FLAG_CLOCKSOURCE) && (!(ch->flags & FLAG_CLOCKEVENT))) |
| 465 | __sh_cmt_set_next(ch, ch->max_match_value); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 466 | out: |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 467 | raw_spin_unlock_irqrestore(&ch->lock, flags); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 468 | |
| 469 | return ret; |
| 470 | } |
| 471 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 472 | static void sh_cmt_stop(struct sh_cmt_channel *ch, unsigned long flag) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 473 | { |
| 474 | unsigned long flags; |
| 475 | unsigned long f; |
| 476 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 477 | raw_spin_lock_irqsave(&ch->lock, flags); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 478 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 479 | f = ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE); |
| 480 | ch->flags &= ~flag; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 481 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 482 | if (f && !(ch->flags & (FLAG_CLOCKEVENT | FLAG_CLOCKSOURCE))) |
| 483 | sh_cmt_disable(ch); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 484 | |
| 485 | /* adjust the timeout to maximum if only clocksource left */ |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 486 | if ((flag == FLAG_CLOCKEVENT) && (ch->flags & FLAG_CLOCKSOURCE)) |
| 487 | __sh_cmt_set_next(ch, ch->max_match_value); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 488 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 489 | raw_spin_unlock_irqrestore(&ch->lock, flags); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 490 | } |
| 491 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 492 | static struct sh_cmt_channel *cs_to_sh_cmt(struct clocksource *cs) |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 493 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 494 | return container_of(cs, struct sh_cmt_channel, cs); |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 495 | } |
| 496 | |
| 497 | static cycle_t sh_cmt_clocksource_read(struct clocksource *cs) |
| 498 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 499 | struct sh_cmt_channel *ch = cs_to_sh_cmt(cs); |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 500 | unsigned long flags, raw; |
| 501 | unsigned long value; |
| 502 | int has_wrapped; |
| 503 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 504 | raw_spin_lock_irqsave(&ch->lock, flags); |
| 505 | value = ch->total_cycles; |
| 506 | raw = sh_cmt_get_counter(ch, &has_wrapped); |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 507 | |
| 508 | if (unlikely(has_wrapped)) |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 509 | raw += ch->match_value + 1; |
| 510 | raw_spin_unlock_irqrestore(&ch->lock, flags); |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 511 | |
| 512 | return value + raw; |
| 513 | } |
| 514 | |
| 515 | static int sh_cmt_clocksource_enable(struct clocksource *cs) |
| 516 | { |
Magnus Damm | 3593f5f | 2011-04-25 22:32:11 +0900 | [diff] [blame] | 517 | int ret; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 518 | struct sh_cmt_channel *ch = cs_to_sh_cmt(cs); |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 519 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 520 | WARN_ON(ch->cs_enabled); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 521 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 522 | ch->total_cycles = 0; |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 523 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 524 | ret = sh_cmt_start(ch, FLAG_CLOCKSOURCE); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 525 | if (!ret) { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 526 | __clocksource_updatefreq_hz(cs, ch->rate); |
| 527 | ch->cs_enabled = true; |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 528 | } |
Magnus Damm | 3593f5f | 2011-04-25 22:32:11 +0900 | [diff] [blame] | 529 | return ret; |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 530 | } |
| 531 | |
| 532 | static void sh_cmt_clocksource_disable(struct clocksource *cs) |
| 533 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 534 | struct sh_cmt_channel *ch = cs_to_sh_cmt(cs); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 535 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 536 | WARN_ON(!ch->cs_enabled); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 537 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 538 | sh_cmt_stop(ch, FLAG_CLOCKSOURCE); |
| 539 | ch->cs_enabled = false; |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 540 | } |
| 541 | |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 542 | static void sh_cmt_clocksource_suspend(struct clocksource *cs) |
| 543 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 544 | struct sh_cmt_channel *ch = cs_to_sh_cmt(cs); |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 545 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 546 | sh_cmt_stop(ch, FLAG_CLOCKSOURCE); |
| 547 | pm_genpd_syscore_poweroff(&ch->cmt->pdev->dev); |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 548 | } |
| 549 | |
Magnus Damm | c816288 | 2010-02-02 14:41:40 -0800 | [diff] [blame] | 550 | static void sh_cmt_clocksource_resume(struct clocksource *cs) |
| 551 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 552 | struct sh_cmt_channel *ch = cs_to_sh_cmt(cs); |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 553 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 554 | pm_genpd_syscore_poweron(&ch->cmt->pdev->dev); |
| 555 | sh_cmt_start(ch, FLAG_CLOCKSOURCE); |
Magnus Damm | c816288 | 2010-02-02 14:41:40 -0800 | [diff] [blame] | 556 | } |
| 557 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 558 | static int sh_cmt_register_clocksource(struct sh_cmt_channel *ch, |
Laurent Pinchart | 1d053e1 | 2014-02-17 16:04:16 +0100 | [diff] [blame] | 559 | const char *name, unsigned long rating) |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 560 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 561 | struct clocksource *cs = &ch->cs; |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 562 | |
| 563 | cs->name = name; |
| 564 | cs->rating = rating; |
| 565 | cs->read = sh_cmt_clocksource_read; |
| 566 | cs->enable = sh_cmt_clocksource_enable; |
| 567 | cs->disable = sh_cmt_clocksource_disable; |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 568 | cs->suspend = sh_cmt_clocksource_suspend; |
Magnus Damm | c816288 | 2010-02-02 14:41:40 -0800 | [diff] [blame] | 569 | cs->resume = sh_cmt_clocksource_resume; |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 570 | cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8); |
| 571 | cs->flags = CLOCK_SOURCE_IS_CONTINUOUS; |
Paul Mundt | f4d7c35 | 2010-06-02 17:10:44 +0900 | [diff] [blame] | 572 | |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 573 | dev_info(&ch->cmt->pdev->dev, "ch%u: used as clock source\n", |
| 574 | ch->index); |
Paul Mundt | f4d7c35 | 2010-06-02 17:10:44 +0900 | [diff] [blame] | 575 | |
Magnus Damm | 3593f5f | 2011-04-25 22:32:11 +0900 | [diff] [blame] | 576 | /* Register with dummy 1 Hz value, gets updated in ->enable() */ |
| 577 | clocksource_register_hz(cs, 1); |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 578 | return 0; |
| 579 | } |
| 580 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 581 | static struct sh_cmt_channel *ced_to_sh_cmt(struct clock_event_device *ced) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 582 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 583 | return container_of(ced, struct sh_cmt_channel, ced); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 584 | } |
| 585 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 586 | static void sh_cmt_clock_event_start(struct sh_cmt_channel *ch, int periodic) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 587 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 588 | struct clock_event_device *ced = &ch->ced; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 589 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 590 | sh_cmt_start(ch, FLAG_CLOCKEVENT); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 591 | |
| 592 | /* TODO: calculate good shift from rate and counter bit width */ |
| 593 | |
| 594 | ced->shift = 32; |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 595 | ced->mult = div_sc(ch->rate, NSEC_PER_SEC, ced->shift); |
| 596 | ced->max_delta_ns = clockevent_delta2ns(ch->max_match_value, ced); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 597 | ced->min_delta_ns = clockevent_delta2ns(0x1f, ced); |
| 598 | |
| 599 | if (periodic) |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 600 | sh_cmt_set_next(ch, ((ch->rate + HZ/2) / HZ) - 1); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 601 | else |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 602 | sh_cmt_set_next(ch, ch->max_match_value); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 603 | } |
| 604 | |
| 605 | static void sh_cmt_clock_event_mode(enum clock_event_mode mode, |
| 606 | struct clock_event_device *ced) |
| 607 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 608 | struct sh_cmt_channel *ch = ced_to_sh_cmt(ced); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 609 | |
| 610 | /* deal with old setting first */ |
| 611 | switch (ced->mode) { |
| 612 | case CLOCK_EVT_MODE_PERIODIC: |
| 613 | case CLOCK_EVT_MODE_ONESHOT: |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 614 | sh_cmt_stop(ch, FLAG_CLOCKEVENT); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 615 | break; |
| 616 | default: |
| 617 | break; |
| 618 | } |
| 619 | |
| 620 | switch (mode) { |
| 621 | case CLOCK_EVT_MODE_PERIODIC: |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 622 | dev_info(&ch->cmt->pdev->dev, |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 623 | "ch%u: used for periodic clock events\n", ch->index); |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 624 | sh_cmt_clock_event_start(ch, 1); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 625 | break; |
| 626 | case CLOCK_EVT_MODE_ONESHOT: |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 627 | dev_info(&ch->cmt->pdev->dev, |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 628 | "ch%u: used for oneshot clock events\n", ch->index); |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 629 | sh_cmt_clock_event_start(ch, 0); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 630 | break; |
| 631 | case CLOCK_EVT_MODE_SHUTDOWN: |
| 632 | case CLOCK_EVT_MODE_UNUSED: |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 633 | sh_cmt_stop(ch, FLAG_CLOCKEVENT); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 634 | break; |
| 635 | default: |
| 636 | break; |
| 637 | } |
| 638 | } |
| 639 | |
| 640 | static int sh_cmt_clock_event_next(unsigned long delta, |
| 641 | struct clock_event_device *ced) |
| 642 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 643 | struct sh_cmt_channel *ch = ced_to_sh_cmt(ced); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 644 | |
| 645 | BUG_ON(ced->mode != CLOCK_EVT_MODE_ONESHOT); |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 646 | if (likely(ch->flags & FLAG_IRQCONTEXT)) |
| 647 | ch->next_match_value = delta - 1; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 648 | else |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 649 | sh_cmt_set_next(ch, delta - 1); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 650 | |
| 651 | return 0; |
| 652 | } |
| 653 | |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 654 | static void sh_cmt_clock_event_suspend(struct clock_event_device *ced) |
| 655 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 656 | struct sh_cmt_channel *ch = ced_to_sh_cmt(ced); |
Laurent Pinchart | 57dee99 | 2013-12-14 15:07:32 +0900 | [diff] [blame] | 657 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 658 | pm_genpd_syscore_poweroff(&ch->cmt->pdev->dev); |
| 659 | clk_unprepare(ch->cmt->clk); |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 660 | } |
| 661 | |
| 662 | static void sh_cmt_clock_event_resume(struct clock_event_device *ced) |
| 663 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 664 | struct sh_cmt_channel *ch = ced_to_sh_cmt(ced); |
Laurent Pinchart | 57dee99 | 2013-12-14 15:07:32 +0900 | [diff] [blame] | 665 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 666 | clk_prepare(ch->cmt->clk); |
| 667 | pm_genpd_syscore_poweron(&ch->cmt->pdev->dev); |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 668 | } |
| 669 | |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 670 | static void sh_cmt_register_clockevent(struct sh_cmt_channel *ch, |
Laurent Pinchart | 1d053e1 | 2014-02-17 16:04:16 +0100 | [diff] [blame] | 671 | const char *name, unsigned long rating) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 672 | { |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 673 | struct clock_event_device *ced = &ch->ced; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 674 | |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 675 | ced->name = name; |
| 676 | ced->features = CLOCK_EVT_FEAT_PERIODIC; |
| 677 | ced->features |= CLOCK_EVT_FEAT_ONESHOT; |
| 678 | ced->rating = rating; |
| 679 | ced->cpumask = cpumask_of(0); |
| 680 | ced->set_next_event = sh_cmt_clock_event_next; |
| 681 | ced->set_mode = sh_cmt_clock_event_mode; |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 682 | ced->suspend = sh_cmt_clock_event_suspend; |
| 683 | ced->resume = sh_cmt_clock_event_resume; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 684 | |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 685 | dev_info(&ch->cmt->pdev->dev, "ch%u: used for clock events\n", |
| 686 | ch->index); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 687 | clockevents_register_device(ced); |
| 688 | } |
| 689 | |
Laurent Pinchart | 1d053e1 | 2014-02-17 16:04:16 +0100 | [diff] [blame] | 690 | static int sh_cmt_register(struct sh_cmt_channel *ch, const char *name, |
Paul Mundt | d1fcc0a | 2009-05-03 18:05:42 +0900 | [diff] [blame] | 691 | unsigned long clockevent_rating, |
| 692 | unsigned long clocksource_rating) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 693 | { |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 694 | if (clockevent_rating) |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 695 | sh_cmt_register_clockevent(ch, name, clockevent_rating); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 696 | |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 697 | if (clocksource_rating) |
Laurent Pinchart | 7269f93 | 2014-01-27 15:29:19 +0100 | [diff] [blame] | 698 | sh_cmt_register_clocksource(ch, name, clocksource_rating); |
Magnus Damm | 19bdc9d | 2009-04-17 05:26:31 +0000 | [diff] [blame] | 699 | |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 700 | return 0; |
| 701 | } |
| 702 | |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 703 | static int sh_cmt_setup_channel(struct sh_cmt_channel *ch, unsigned int index, |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 704 | struct sh_cmt_device *cmt) |
| 705 | { |
| 706 | struct sh_timer_config *cfg = cmt->pdev->dev.platform_data; |
| 707 | int irq; |
| 708 | int ret; |
| 709 | |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 710 | ch->cmt = cmt; |
Laurent Pinchart | c924d2d | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 711 | ch->base = cmt->mapbase_ch; |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 712 | ch->index = index; |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 713 | |
| 714 | irq = platform_get_irq(cmt->pdev, 0); |
| 715 | if (irq < 0) { |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 716 | dev_err(&cmt->pdev->dev, "ch%u: failed to get irq\n", |
| 717 | ch->index); |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 718 | return irq; |
| 719 | } |
| 720 | |
| 721 | if (cmt->width == (sizeof(ch->max_match_value) * 8)) |
| 722 | ch->max_match_value = ~0; |
| 723 | else |
| 724 | ch->max_match_value = (1 << cmt->width) - 1; |
| 725 | |
| 726 | ch->match_value = ch->max_match_value; |
| 727 | raw_spin_lock_init(&ch->lock); |
| 728 | |
Laurent Pinchart | 1d053e1 | 2014-02-17 16:04:16 +0100 | [diff] [blame] | 729 | ret = sh_cmt_register(ch, dev_name(&cmt->pdev->dev), |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 730 | cfg->clockevent_rating, |
| 731 | cfg->clocksource_rating); |
| 732 | if (ret) { |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 733 | dev_err(&cmt->pdev->dev, "ch%u: registration failed\n", |
| 734 | ch->index); |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 735 | return ret; |
| 736 | } |
| 737 | ch->cs_enabled = false; |
| 738 | |
| 739 | ret = request_irq(irq, sh_cmt_interrupt, |
| 740 | IRQF_TIMER | IRQF_IRQPOLL | IRQF_NOBALANCING, |
| 741 | dev_name(&cmt->pdev->dev), ch); |
| 742 | if (ret) { |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 743 | dev_err(&cmt->pdev->dev, "ch%u: failed to request irq %d\n", |
| 744 | ch->index, irq); |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 745 | return ret; |
| 746 | } |
| 747 | |
| 748 | return 0; |
| 749 | } |
| 750 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 751 | static int sh_cmt_setup(struct sh_cmt_device *cmt, struct platform_device *pdev) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 752 | { |
Paul Mundt | 46a12f7 | 2009-05-03 17:57:17 +0900 | [diff] [blame] | 753 | struct sh_timer_config *cfg = pdev->dev.platform_data; |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 754 | struct resource *res, *res2; |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 755 | int ret; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 756 | ret = -ENXIO; |
| 757 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 758 | cmt->pdev = pdev; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 759 | |
| 760 | if (!cfg) { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 761 | dev_err(&cmt->pdev->dev, "missing platform data\n"); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 762 | goto err0; |
| 763 | } |
| 764 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 765 | res = platform_get_resource(cmt->pdev, IORESOURCE_MEM, 0); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 766 | if (!res) { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 767 | dev_err(&cmt->pdev->dev, "failed to get I/O memory\n"); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 768 | goto err0; |
| 769 | } |
| 770 | |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 771 | /* optional resource for the shared timer start/stop register */ |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 772 | res2 = platform_get_resource(cmt->pdev, IORESOURCE_MEM, 1); |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 773 | |
Laurent Pinchart | 36f1ac9 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 774 | /* map memory, let mapbase_ch point to our channel */ |
| 775 | cmt->mapbase_ch = ioremap_nocache(res->start, resource_size(res)); |
| 776 | if (cmt->mapbase_ch == NULL) { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 777 | dev_err(&cmt->pdev->dev, "failed to remap I/O memory\n"); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 778 | goto err0; |
| 779 | } |
| 780 | |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 781 | /* map second resource for CMSTR */ |
Laurent Pinchart | 36f1ac9 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 782 | cmt->mapbase = ioremap_nocache(res2 ? res2->start : |
| 783 | res->start - cfg->channel_offset, |
| 784 | res2 ? resource_size(res2) : 2); |
| 785 | if (cmt->mapbase == NULL) { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 786 | dev_err(&cmt->pdev->dev, "failed to remap I/O second memory\n"); |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 787 | goto err1; |
| 788 | } |
| 789 | |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 790 | /* get hold of clock */ |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 791 | cmt->clk = clk_get(&cmt->pdev->dev, "cmt_fck"); |
| 792 | if (IS_ERR(cmt->clk)) { |
| 793 | dev_err(&cmt->pdev->dev, "cannot get clock\n"); |
| 794 | ret = PTR_ERR(cmt->clk); |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 795 | goto err2; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 796 | } |
| 797 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 798 | ret = clk_prepare(cmt->clk); |
Laurent Pinchart | 57dee99 | 2013-12-14 15:07:32 +0900 | [diff] [blame] | 799 | if (ret < 0) |
| 800 | goto err3; |
| 801 | |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 802 | if (res2 && (resource_size(res2) == 4)) { |
| 803 | /* assume both CMSTR and CMCSR to be 32-bit */ |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 804 | cmt->read_control = sh_cmt_read32; |
| 805 | cmt->write_control = sh_cmt_write32; |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 806 | } else { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 807 | cmt->read_control = sh_cmt_read16; |
| 808 | cmt->write_control = sh_cmt_write16; |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 809 | } |
Magnus Damm | cccd704 | 2012-12-14 14:54:28 +0900 | [diff] [blame] | 810 | |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 811 | if (resource_size(res) == 6) { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 812 | cmt->width = 16; |
| 813 | cmt->read_count = sh_cmt_read16; |
| 814 | cmt->write_count = sh_cmt_write16; |
| 815 | cmt->overflow_bit = 0x80; |
| 816 | cmt->clear_bits = ~0x80; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 817 | } else { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 818 | cmt->width = 32; |
| 819 | cmt->read_count = sh_cmt_read32; |
| 820 | cmt->write_count = sh_cmt_write32; |
| 821 | cmt->overflow_bit = 0x8000; |
| 822 | cmt->clear_bits = ~0xc000; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 823 | } |
| 824 | |
Laurent Pinchart | 740a951 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 825 | ret = sh_cmt_setup_channel(&cmt->channel, cfg->timer_bit, cmt); |
Laurent Pinchart | b882e7b | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 826 | if (ret < 0) |
Laurent Pinchart | 57dee99 | 2013-12-14 15:07:32 +0900 | [diff] [blame] | 827 | goto err4; |
Paul Mundt | da64c2a | 2010-02-25 16:37:46 +0900 | [diff] [blame] | 828 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 829 | platform_set_drvdata(pdev, cmt); |
Magnus Damm | adccc69 | 2012-12-14 14:53:51 +0900 | [diff] [blame] | 830 | |
Paul Mundt | da64c2a | 2010-02-25 16:37:46 +0900 | [diff] [blame] | 831 | return 0; |
Laurent Pinchart | 57dee99 | 2013-12-14 15:07:32 +0900 | [diff] [blame] | 832 | err4: |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 833 | clk_unprepare(cmt->clk); |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 834 | err3: |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 835 | clk_put(cmt->clk); |
Magnus Damm | 8874c5e | 2013-06-17 15:40:52 +0900 | [diff] [blame] | 836 | err2: |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 837 | iounmap(cmt->mapbase); |
Laurent Pinchart | 36f1ac9 | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 838 | err1: |
| 839 | iounmap(cmt->mapbase_ch); |
Paul Mundt | da64c2a | 2010-02-25 16:37:46 +0900 | [diff] [blame] | 840 | err0: |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 841 | return ret; |
| 842 | } |
| 843 | |
Greg Kroah-Hartman | 1850514 | 2012-12-21 15:11:38 -0800 | [diff] [blame] | 844 | static int sh_cmt_probe(struct platform_device *pdev) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 845 | { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 846 | struct sh_cmt_device *cmt = platform_get_drvdata(pdev); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 847 | struct sh_timer_config *cfg = pdev->dev.platform_data; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 848 | int ret; |
| 849 | |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 850 | if (!is_early_platform_device(pdev)) { |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 851 | pm_runtime_set_active(&pdev->dev); |
| 852 | pm_runtime_enable(&pdev->dev); |
Rafael J. Wysocki | 9bb5ec8 | 2012-08-06 01:43:03 +0200 | [diff] [blame] | 853 | } |
Rafael J. Wysocki | 615a445 | 2012-03-13 22:40:06 +0100 | [diff] [blame] | 854 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 855 | if (cmt) { |
Paul Mundt | 214a607 | 2010-03-10 16:26:25 +0900 | [diff] [blame] | 856 | dev_info(&pdev->dev, "kept as earlytimer\n"); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 857 | goto out; |
Magnus Damm | e475eed | 2009-04-15 10:50:04 +0000 | [diff] [blame] | 858 | } |
| 859 | |
Laurent Pinchart | b262bc7 | 2014-01-27 22:04:17 +0100 | [diff] [blame^] | 860 | cmt = kzalloc(sizeof(*cmt), GFP_KERNEL); |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 861 | if (cmt == NULL) { |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 862 | dev_err(&pdev->dev, "failed to allocate driver data\n"); |
| 863 | return -ENOMEM; |
| 864 | } |
| 865 | |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 866 | ret = sh_cmt_setup(cmt, pdev); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 867 | if (ret) { |
Laurent Pinchart | 2653caf | 2014-01-27 22:04:17 +0100 | [diff] [blame] | 868 | kfree(cmt); |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 869 | pm_runtime_idle(&pdev->dev); |
| 870 | return ret; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 871 | } |
Rafael J. Wysocki | bad8138 | 2012-08-06 01:48:57 +0200 | [diff] [blame] | 872 | if (is_early_platform_device(pdev)) |
| 873 | return 0; |
| 874 | |
| 875 | out: |
| 876 | if (cfg->clockevent_rating || cfg->clocksource_rating) |
| 877 | pm_runtime_irq_safe(&pdev->dev); |
| 878 | else |
| 879 | pm_runtime_idle(&pdev->dev); |
| 880 | |
| 881 | return 0; |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 882 | } |
| 883 | |
Greg Kroah-Hartman | 1850514 | 2012-12-21 15:11:38 -0800 | [diff] [blame] | 884 | static int sh_cmt_remove(struct platform_device *pdev) |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 885 | { |
| 886 | return -EBUSY; /* cannot unregister clockevent and clocksource */ |
| 887 | } |
| 888 | |
| 889 | static struct platform_driver sh_cmt_device_driver = { |
| 890 | .probe = sh_cmt_probe, |
Greg Kroah-Hartman | 1850514 | 2012-12-21 15:11:38 -0800 | [diff] [blame] | 891 | .remove = sh_cmt_remove, |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 892 | .driver = { |
| 893 | .name = "sh_cmt", |
| 894 | } |
| 895 | }; |
| 896 | |
| 897 | static int __init sh_cmt_init(void) |
| 898 | { |
| 899 | return platform_driver_register(&sh_cmt_device_driver); |
| 900 | } |
| 901 | |
| 902 | static void __exit sh_cmt_exit(void) |
| 903 | { |
| 904 | platform_driver_unregister(&sh_cmt_device_driver); |
| 905 | } |
| 906 | |
Magnus Damm | e475eed | 2009-04-15 10:50:04 +0000 | [diff] [blame] | 907 | early_platform_init("earlytimer", &sh_cmt_device_driver); |
Simon Horman | e903a03 | 2013-03-05 15:40:42 +0900 | [diff] [blame] | 908 | subsys_initcall(sh_cmt_init); |
Magnus Damm | 3fb1b6a | 2009-01-22 09:55:59 +0000 | [diff] [blame] | 909 | module_exit(sh_cmt_exit); |
| 910 | |
| 911 | MODULE_AUTHOR("Magnus Damm"); |
| 912 | MODULE_DESCRIPTION("SuperH CMT Timer Driver"); |
| 913 | MODULE_LICENSE("GPL v2"); |