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/*-
* Copyright (c) 2011 Semihalf.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* From: FreeBSD: src/sys/arm/mv/kirkwood/sheevaplug.c,v 1.2 2010/06/13 13:28:53
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/armreg.h>
#include <arm/mv/mvreg.h>
#include <arm/mv/mvvar.h>
#include <dev/fdt/fdt_common.h>
#include <dev/ofw/openfirm.h>
#include <machine/fdt.h>
#define CPU_FREQ_FIELD(sar) (((0x01 & (sar >> 52)) << 3) | \
(0x07 & (sar >> 21)))
#define FAB_FREQ_FIELD(sar) (((0x01 & (sar >> 51)) << 4) | \
(0x0F & (sar >> 24)))
static uint32_t count_l2clk(void);
/* XXX Make gpio driver optional and remove it */
struct resource_spec mv_gpio_res[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
{ SYS_RES_IRQ, 0, RF_ACTIVE },
{ -1, 0 }
};
struct vco_freq_ratio {
uint8_t vco_cpu; /* VCO to CLK0(CPU) clock ratio */
uint8_t vco_l2c; /* VCO to NB(L2 cache) clock ratio */
uint8_t vco_hcl; /* VCO to HCLK(DDR controller) clock ratio */
uint8_t vco_ddr; /* VCO to DR(DDR memory) clock ratio */
};
static struct vco_freq_ratio freq_conf_table[] = {
/*00*/ { 1, 1, 4, 2 },
/*01*/ { 1, 2, 2, 2 },
/*02*/ { 2, 2, 6, 3 },
/*03*/ { 2, 2, 3, 3 },
/*04*/ { 1, 2, 3, 3 },
/*05*/ { 1, 2, 4, 2 },
/*06*/ { 1, 1, 2, 2 },
/*07*/ { 2, 3, 6, 6 },
/*08*/ { 2, 3, 5, 5 },
/*09*/ { 1, 2, 6, 3 },
/*10*/ { 2, 4, 10, 5 },
/*11*/ { 1, 3, 6, 6 },
/*12*/ { 1, 2, 5, 5 },
/*13*/ { 1, 3, 6, 3 },
/*14*/ { 1, 2, 5, 5 },
/*15*/ { 2, 2, 5, 5 },
/*16*/ { 1, 1, 3, 3 },
/*17*/ { 2, 5, 10, 10 },
/*18*/ { 1, 3, 8, 4 },
/*19*/ { 1, 1, 2, 1 },
/*20*/ { 2, 3, 6, 3 },
/*21*/ { 1, 2, 8, 4 },
/*22*/ { 2, 5, 10, 5 }
};
static uint16_t cpu_clock_table[] = {
1000, 1066, 1200, 1333, 1500, 1666, 1800, 2000, 600, 667, 800, 1600,
2133, 2200, 2400 };
uint32_t
get_tclk(void)
{
uint32_t cputype;
cputype = cpufunc_id();
cputype &= CPU_ID_CPU_MASK;
if (cputype == CPU_ID_MV88SV584X_V7)
return (TCLK_250MHZ);
else
return (TCLK_200MHZ);
}
static uint32_t
count_l2clk(void)
{
uint64_t sar_reg;
uint32_t freq_vco, freq_l2clk;
uint8_t sar_cpu_freq, sar_fab_freq, array_size;
/* Get value of the SAR register and process it */
sar_reg = get_sar_value();
sar_cpu_freq = CPU_FREQ_FIELD(sar_reg);
sar_fab_freq = FAB_FREQ_FIELD(sar_reg);
/* Check if CPU frequency field has correct value */
array_size = sizeof(cpu_clock_table) / sizeof(cpu_clock_table[0]);
if (sar_cpu_freq >= array_size)
panic("Reserved value in cpu frequency configuration field: "
"%d", sar_cpu_freq);
/* Check if fabric frequency field has correct value */
array_size = sizeof(freq_conf_table) / sizeof(freq_conf_table[0]);
if (sar_fab_freq >= array_size)
panic("Reserved value in fabric frequency configuration field: "
"%d", sar_fab_freq);
/* Get CPU clock frequency */
freq_vco = cpu_clock_table[sar_cpu_freq] *
freq_conf_table[sar_fab_freq].vco_cpu;
/* Get L2CLK clock frequency */
freq_l2clk = freq_vco / freq_conf_table[sar_fab_freq].vco_l2c;
/* Round L2CLK value to integer MHz */
if (((freq_vco % freq_conf_table[sar_fab_freq].vco_l2c) * 10 /
freq_conf_table[sar_fab_freq].vco_l2c) >= 5)
freq_l2clk++;
return (freq_l2clk * 1000000);
}
uint32_t
get_l2clk(void)
{
static uint32_t l2clk_freq = 0;
/* If get_l2clk is called first time get L2CLK value from register */
if (l2clk_freq == 0)
l2clk_freq = count_l2clk();
return (l2clk_freq);
}
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