Ronald G. Minnich (rminnich@gmail.com) just uploaded a new patch set to gerrit, which you can find at http://review.coreboot.org/3073
-gerrit
commit 68938fdaa0e8a97b392a71521c57c0c6c019d256 Author: Ronald G. Minnich rminnich@gmail.com Date: Thu Apr 11 15:03:28 2013 -0700
Exynos5250: add a microsecond timer
Add a microsecond timer, its declaration, the function to start it, and its usage. To start it, one calls microsecond() for any reason, using the result or not. From that point on, it returns microseconds from the first call.
We show its use in romstage. You want it started very early. Finally, the delay.h changed having been (ironically) delayed, we create time.h and have it hold one declaration, for the microseconds prototype.
Change-Id: I19cbc2bb0089a3de88cfb94276266af38b9363c5 Signed-off-by: Ronald G. Minnich rminnich@gmail.com --- src/cpu/samsung/exynos5250/Kconfig | 8 +++ src/cpu/samsung/exynos5250/Makefile.inc | 2 + src/cpu/samsung/exynos5250/mct.c | 122 ++++++++++++++++++++++++++++++++ src/include/time.h | 9 +++ src/mainboard/google/snow/romstage.c | 5 ++ 5 files changed, 146 insertions(+)
diff --git a/src/cpu/samsung/exynos5250/Kconfig b/src/cpu/samsung/exynos5250/Kconfig index cc67abd..a63ccd7 100644 --- a/src/cpu/samsung/exynos5250/Kconfig +++ b/src/cpu/samsung/exynos5250/Kconfig @@ -97,3 +97,11 @@ config SYS_TEXT_BASE config COREBOOT_TABLES_SIZE hex default 0x4000000 + +config MCT_ADDRESS + hex + default 0x101c0000 + +config MCT_HZ + int + default 24000000 diff --git a/src/cpu/samsung/exynos5250/Makefile.inc b/src/cpu/samsung/exynos5250/Makefile.inc index 74bc871..6652328 100644 --- a/src/cpu/samsung/exynos5250/Makefile.inc +++ b/src/cpu/samsung/exynos5250/Makefile.inc @@ -16,6 +16,7 @@ romstage-y += pinmux.c # required by s3c24x0_i2c (exynos5-common) and uart. romstage-y += dmc_common.c romstage-y += dmc_init_ddr3.c romstage-y += power.c +romstage-y += mct.c romstage-$(CONFIG_EARLY_CONSOLE) += soc.c romstage-$(CONFIG_EARLY_CONSOLE) += uart.c
@@ -27,6 +28,7 @@ ramstage-y += power.c ramstage-y += soc.c ramstage-$(CONFIG_CONSOLE_SERIAL_UART) += uart.c ramstage-y += cpu.c +ramstage-y += mct.c
#ramstage-$(CONFIG_SATA_AHCI) += sata.c
diff --git a/src/cpu/samsung/exynos5250/mct.c b/src/cpu/samsung/exynos5250/mct.c new file mode 100644 index 0000000..98b8ca8 --- /dev/null +++ b/src/cpu/samsung/exynos5250/mct.c @@ -0,0 +1,122 @@ +/* + * Copyright 2013 Google Inc. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * 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; either version 2 of + * the License, or (at your option) any later version. + * + * 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., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <arch/io.h> +#include <stdint.h> +#include <time.h> + +typedef struct __attribute__((packed)) mct_regs +{ + uint32_t mct_cfg; + uint8_t reserved0[0xfc]; + uint32_t g_cnt_l; + uint32_t g_cnt_u; + uint8_t reserved1[0x8]; + uint32_t g_cnt_wstat; + uint8_t reserved2[0xec]; + uint32_t g_comp0_l; + uint32_t g_comp0_u; + uint32_t g_comp0_addr_incr; + uint8_t reserved3[0x4]; + uint32_t g_comp1_l; + uint32_t g_comp1_u; + uint32_t g_comp1_addr_incr; + uint8_t reserved4[0x4]; + uint32_t g_comp2_l; + uint32_t g_comp2_u; + uint32_t g_comp2_addr_incr; + uint8_t reserved5[0x4]; + uint32_t g_comp3_l; + uint32_t g_comp3_u; + uint32_t g_comp3_addr_incr; + uint8_t reserved6[0x4]; + uint32_t g_tcon; + uint32_t g_int_cstat; + uint32_t g_int_enb; + uint32_t g_wstat; + uint8_t reserved7[0xb0]; + uint32_t l0_tcntb; + uint32_t l0_tcnto; + uint32_t l0_icntb; + uint32_t l0_icnto; + uint32_t l0_frcntb; + uint32_t l0_frcnto; + uint8_t reserved8[0x8]; + uint32_t l0_tcon; + uint8_t reserved9[0xc]; + uint32_t l0_int_cstat; + uint32_t l0_int_enb; + uint8_t reserved10[0x8]; + uint32_t l0_wstat; + uint8_t reserved11[0xbc]; + uint32_t l1_tcntb; + uint32_t l1_tcnto; + uint32_t l1_icntb; + uint32_t l1_icnto; + uint32_t l1_frcntb; + uint32_t l1_frcnto; + uint8_t reserved12[0x8]; + uint32_t l1_tcon; + uint8_t reserved13[0xc]; + uint32_t l1_int_cstat; + uint32_t l1_int_enb; + uint8_t reserved14[0x8]; + uint32_t l1_wstat; +} mct_regs; + +/* I would prefer not to export these for now. */ +static uint64_t timer_hz(void) +{ + return CONFIG_MCT_HZ; +} + +static int enabled = 0; +static mct_regs *const mct = + (mct_regs *)CONFIG_MCT_ADDRESS; + +static uint64_t timer_raw_value(void) +{ + if (!enabled) { + writel(readl(&mct->g_tcon) | (0x1 << 8), &mct->g_tcon); + enabled = 1; + } + + uint64_t upper = readl(&mct->g_cnt_u); + uint64_t lower = readl(&mct->g_cnt_l); + + return (upper << 32) | lower; +} + +void timer_start(void) +{ + writel(readl(&mct->g_tcon) | (0x1 << 8), &mct->g_tcon); + enabled = 1; +} + +u32 timer_us(void) +{ + uint64_t raw = timer_raw_value(); + uint32_t ticks_per_microsecond = timer_hz()/1000000; + uint32_t usec = raw / ticks_per_microsecond; + return usec; +} + diff --git a/src/include/time.h b/src/include/time.h new file mode 100644 index 0000000..da0f3c7 --- /dev/null +++ b/src/include/time.h @@ -0,0 +1,9 @@ +#ifndef TIME_H +#define TIME_H + +#if !defined( __ROMCC__) + +void timer_start(void); +u32 timer_us(void); +#endif +#endif /* TIME_H */ diff --git a/src/mainboard/google/snow/romstage.c b/src/mainboard/google/snow/romstage.c index 7a26ed9..b1cc0fd 100644 --- a/src/mainboard/google/snow/romstage.c +++ b/src/mainboard/google/snow/romstage.c @@ -36,6 +36,7 @@ #include <cpu/samsung/exynos5250/clock_init.h> #include <console/console.h> #include <arch/stages.h> +#include <time.h>
#include <drivers/maxim/max77686/max77686.h> #include <device/i2c.h> @@ -150,6 +151,10 @@ void main(void) struct arm_clk_ratios *arm_ratios; int ret; void *entry; + /* kick off the microsecond timer. We want to do this as early + * as we can. + */ + timer_start();
clock_set_rate(PERIPH_ID_SPI1, 50000000); /* set spi clock to 50Mhz */