From 97ca02cb170f870d5a47f92d5b9a79fe4664dca4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jonathan=20Neusch=C3=A4fer?= Date: Mon, 29 Oct 2018 14:32:49 +0100 Subject: soc/sifive/fu540: Add helper function to get tlclk frequency MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit tlclk is not specific to the UART block in the FU540, so let's calculate its frequency in clock.c. Change-Id: I270920027f1132253e413a1bf9feb4fe279b651a Signed-off-by: Jonathan Neuschäfer Reviewed-on: https://review.coreboot.org/c/29335 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel Reviewed-by: Philipp Hug --- src/soc/sifive/fu540/clock.c | 11 +++++++++++ src/soc/sifive/fu540/include/soc/clock.h | 1 + src/soc/sifive/fu540/uart.c | 6 +----- 3 files changed, 13 insertions(+), 5 deletions(-) diff --git a/src/soc/sifive/fu540/clock.c b/src/soc/sifive/fu540/clock.c index 8aaba35d6c..597b2069db 100644 --- a/src/soc/sifive/fu540/clock.c +++ b/src/soc/sifive/fu540/clock.c @@ -250,3 +250,14 @@ int clock_get_coreclk_khz(void) / (divr + 1) / (1ul << divq); } + +/* Get the TileLink clock's frequency, in KHz */ +int clock_get_tlclk_khz(void) +{ + /* + * The TileLink bus and most peripherals use tlclk, which is coreclk/2, + * as input. + */ + + return clock_get_coreclk_khz() / 2; +} diff --git a/src/soc/sifive/fu540/include/soc/clock.h b/src/soc/sifive/fu540/include/soc/clock.h index d54c6662c2..706c9c00f7 100644 --- a/src/soc/sifive/fu540/include/soc/clock.h +++ b/src/soc/sifive/fu540/include/soc/clock.h @@ -18,5 +18,6 @@ void clock_init(void); int clock_get_coreclk_khz(void); +int clock_get_tlclk_khz(void); #endif /* __SOC_SIFIVE_HIFIFE_U_CLOCK_H__ */ diff --git a/src/soc/sifive/fu540/uart.c b/src/soc/sifive/fu540/uart.c index 454b13d111..b59b78902a 100644 --- a/src/soc/sifive/fu540/uart.c +++ b/src/soc/sifive/fu540/uart.c @@ -29,9 +29,5 @@ uintptr_t uart_platform_base(int idx) unsigned int uart_platform_refclk(void) { - /* - * The SiFive UART uses tlclk, which is coreclk/2, as input - */ - - return clock_get_coreclk_khz() * KHz / 2; + return clock_get_tlclk_khz() * KHz; } -- cgit v1.2.3