97 lines
2.6 KiB
C++
97 lines
2.6 KiB
C++
/*
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* (C) Copyright 2010 Quantenna Communications Inc.
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#ifndef __CLOCK_INL
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#define __CLOCK_INL
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#ifdef __ASSEMBLY__
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#include <config.h>
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#include <asm/arcregs.h>
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#include <asm/arch/platform.h>
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/**********************************************************/
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/* Please make sure that these registers are not touched by other startup code! */
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#define RUBY_BUS_CLOCK_REG r23
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#define RUBY_CPU_CLOCK_REG r24
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.macro M_CLKSEL_ENTRY value constant
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cmp_s RUBY_BUS_CLOCK_REG, RUBY_SYS_CTL_CLKSEL(\value)
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mov.z RUBY_BUS_CLOCK_REG, \constant
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bz read_done
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.endm
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.macro M_CLOCK_VAR name
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.align 4
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\name:
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.word 0
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.globl \name
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.endm
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.macro M_CLOCK_VARS
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/* Asm as well as C-code can use this variables to get bus and cpu freq */
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M_CLOCK_VAR ruby_bus_clk
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M_CLOCK_VAR ruby_cpu_clk
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.endm
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.macro M_CLOCK_SAVE
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/* Store bus freq */
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st RUBY_BUS_CLOCK_REG, [ruby_bus_clk]
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/* Store cpu freq */
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st RUBY_CPU_CLOCK_REG, [ruby_cpu_clk]
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.endm
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.macro M_CLOCK_READ
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#if defined(RUBY_FIXED_CLK)
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/* Hard-coded value */
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mov RUBY_BUS_CLOCK_REG, RUBY_FIXED_BUS_CLK
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mov RUBY_CPU_CLOCK_REG, RUBY_FIXED_CPU_CLK
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#elif defined(RUBY_READ_CLK)
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/* Load clock select bits */
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ld.di RUBY_BUS_CLOCK_REG, [RUBY_SYS_CTL_CTRL]
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and RUBY_BUS_CLOCK_REG, RUBY_BUS_CLOCK_REG, RUBY_SYS_CTL_MASK_CLKSEL
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/* Check clock select bits and choose bus freq */
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M_CLKSEL_ENTRY 0 RUBY_SYS_CTL_CLKSEL_00_BUS_FREQ
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M_CLKSEL_ENTRY 1 RUBY_SYS_CTL_CLKSEL_01_BUS_FREQ
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M_CLKSEL_ENTRY 2 RUBY_SYS_CTL_CLKSEL_10_BUS_FREQ
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M_CLKSEL_ENTRY 3 RUBY_SYS_CTL_CLKSEL_11_BUS_FREQ
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/* Ok, let's assign something */
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mov_s RUBY_BUS_CLOCK_REG, 0
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read_done:
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/* ASIC cpu freq is x2 bus freq */
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asl RUBY_CPU_CLOCK_REG, RUBY_BUS_CLOCK_REG, 1
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#else
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#error "Not supported"
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#endif // #if defined(RUBY_FIXED_CLK)
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.endm
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#endif // #ifdef __ASSEMBLY__
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#endif // #ifndef __CLOCK_INL
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