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author | Daisuke Nojiri <dnojiri@chromium.org> | 2015-02-04 17:23:53 -0800 |
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committer | Patrick Georgi <pgeorgi@google.com> | 2015-04-17 10:19:34 +0200 |
commit | fcfd989774eaffa891666df617e3e424660769d1 (patch) | |
tree | 8bd2b561ff315875037992fd9aeedb2e56b8a5c2 /src/soc/broadcom/cygnus/timer.c | |
parent | 352135e6e8f1206da6b09350a8a356c864f41fd0 (diff) | |
download | coreboot-fcfd989774eaffa891666df617e3e424660769d1.tar.xz |
cygnus: add timer functions
this implements udelay.
BUG=chrome-os-partner:36011
BRANCH=broadcom-firmware
TEST=measured 10 sec of delay by stopwatch
Change-Id: I833b71fac98a871bff71478221a55e1ca15c13df
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 137456e63931052f80247b72f98f958afdba8a27
Original-Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>
Original-Change-Id: Ib5e33a19421eae900800fce94e9fd51bc2c665c4
Original-Reviewed-on: https://chromium-review.googlesource.com/251302
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: http://review.coreboot.org/9766
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <edward.ocallaghan@koparo.com>
Diffstat (limited to 'src/soc/broadcom/cygnus/timer.c')
-rw-r--r-- | src/soc/broadcom/cygnus/timer.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/src/soc/broadcom/cygnus/timer.c b/src/soc/broadcom/cygnus/timer.c new file mode 100644 index 0000000000..5116389778 --- /dev/null +++ b/src/soc/broadcom/cygnus/timer.c @@ -0,0 +1,71 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2015 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <arch/io.h> +#include <delay.h> +#include <soc/addressmap.h> +#include <timer.h> + +#define TIMER_GLB_TIM_CTRL_PRESC_MASK 0x0000FF00 +#define TIMER_GLB_TIM_CTRL_TIM_EN 0x00000001 +#define TIMER_GLB_TIM_CTRL_PRESC 0x0 +/* + * arm clk is 1GHz, periph_clk=arm_clk/2, tick per usec. + * arm clk is set by the bootrom. See util/broadcom/unauth.cfg for details. + */ +#define PERIPH_CLOCK 500 +#define CLOCKS_PER_USEC (PERIPH_CLOCK / \ + (((TIMER_GLB_TIM_CTRL_PRESC & TIMER_GLB_TIM_CTRL_PRESC_MASK) >> 8) + 1)) + +struct cygnus_timer { + u32 gtim_glob_low; + u32 gtim_glob_hi; + u32 gtim_glob_ctrl; +}; + +static struct cygnus_timer * const timer_ptr = + (void *)IPROC_PERIPH_GLB_TIM_REG_BASE; + +static inline uint64_t timer_raw_value(void) +{ + uint64_t cur_tick; + uint32_t count_h; + uint32_t count_l; + + do { + count_h = readl(&timer_ptr->gtim_glob_hi); + count_l = readl(&timer_ptr->gtim_glob_low); + cur_tick = readl(&timer_ptr->gtim_glob_hi); + } while (cur_tick != count_h); + + return (cur_tick << 32) + count_l; +} + +void timer_monotonic_get(struct mono_time *mt) +{ + mono_time_set_usecs(mt, timer_raw_value() / CLOCKS_PER_USEC); +} + +void init_timer(void) +{ + writel(TIMER_GLB_TIM_CTRL_PRESC, &timer_ptr->gtim_glob_ctrl); + writel(0, &timer_ptr->gtim_glob_low); + writel(0, &timer_ptr->gtim_glob_hi); + writel(TIMER_GLB_TIM_CTRL_TIM_EN, &timer_ptr->gtim_glob_ctrl); +} |