// SPDX-License-Identifier: GPL-2.0
/*
* Marvell MV98DX3236 SoC clocks
*
* Copyright ( C ) 2012 Marvell
*
* Gregory CLEMENT < gregory . clement @ free - electrons . com >
* Sebastian Hesselbarth < sebastian . hesselbarth @ gmail . com >
* Andrew Lunn < andrew @ lunn . ch >
*
*/
#include <linux/kernel.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/of.h>
#include "common.h"
/*
* For 98 DX4251 Sample At Reset the CPU , DDR and Main PLL clocks are all
* defined at the same time
*
* SAR1 [ 20 : 18 ] : CPU frequency DDR frequency MPLL frequency
* 0 = 400 MHz 400 MHz 800 MHz
* 2 = 667 MHz 667 MHz 2000 MHz
* 3 = 800 MHz 800 MHz 1600 MHz
* others reserved .
*
* For 98 DX3236 Sample At Reset the CPU , DDR and Main PLL clocks are all
* defined at the same time
*
* SAR1 [ 20 : 18 ] : CPU frequency DDR frequency MPLL frequency
* 1 = 667 MHz 667 MHz 2000 MHz
* 2 = 400 MHz 400 MHz 400 MHz
* 3 = 800 MHz 800 MHz 800 MHz
* 5 = 800 MHz 400 MHz 800 MHz
* others reserved .
*/
#define SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT 18
#define SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK 0 x7
static u32 __init mv98dx3236_get_tclk_freq(void __iomem *sar)
{
/* Tclk = 200MHz, no SaR dependency */
return 200000000 ;
}
static const u32 mv98dx3236_cpu_frequencies[] __initconst = {
0 ,
667000000 ,
400000000 ,
800000000 ,
0 ,
800000000 ,
0 , 0 ,
};
static const u32 mv98dx4251_cpu_frequencies[] __initconst = {
400000000 ,
0 ,
667000000 ,
800000000 ,
0 , 0 , 0 , 0 ,
};
static u32 __init mv98dx3236_get_cpu_freq(void __iomem *sar)
{
u32 cpu_freq = 0 ;
u8 cpu_freq_select = 0 ;
cpu_freq_select = ((readl(sar) >> SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT) &
SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK);
if (of_machine_is_compatible("marvell,armadaxp-98dx4251" ))
cpu_freq = mv98dx4251_cpu_frequencies[cpu_freq_select];
else if (of_machine_is_compatible("marvell,armadaxp-98dx3236" ))
cpu_freq = mv98dx3236_cpu_frequencies[cpu_freq_select];
if (!cpu_freq)
pr_err("CPU freq select unsupported %d\n" , cpu_freq_select);
return cpu_freq;
}
enum {
MV98DX3236_CPU_TO_DDR,
MV98DX3236_CPU_TO_MPLL
};
static const struct coreclk_ratio mv98dx3236_core_ratios[] __initconst = {
{ .id = MV98DX3236_CPU_TO_DDR, .name = "ddrclk" },
{ .id = MV98DX3236_CPU_TO_MPLL, .name = "mpll" },
};
static const int __initconst mv98dx3236_cpu_mpll_ratios[8 ][2 ] = {
{0 , 1 }, {3 , 1 }, {1 , 1 }, {1 , 1 },
{0 , 1 }, {1 , 1 }, {0 , 1 }, {0 , 1 },
};
static const int __initconst mv98dx3236_cpu_ddr_ratios[8 ][2 ] = {
{0 , 1 }, {1 , 1 }, {1 , 1 }, {1 , 1 },
{0 , 1 }, {1 , 2 }, {0 , 1 }, {0 , 1 },
};
static const int __initconst mv98dx4251_cpu_mpll_ratios[8 ][2 ] = {
{2 , 1 }, {0 , 1 }, {3 , 1 }, {2 , 1 },
{0 , 1 }, {0 , 1 }, {0 , 1 }, {0 , 1 },
};
static const int __initconst mv98dx4251_cpu_ddr_ratios[8 ][2 ] = {
{1 , 1 }, {0 , 1 }, {1 , 1 }, {1 , 1 },
{0 , 1 }, {0 , 1 }, {0 , 1 }, {0 , 1 },
};
static void __init mv98dx3236_get_clk_ratio(
void __iomem *sar, int id, int *mult, int *div)
{
u32 opt = ((readl(sar) >> SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT) &
SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK);
switch (id) {
case MV98DX3236_CPU_TO_DDR:
if (of_machine_is_compatible("marvell,armadaxp-98dx4251" )) {
*mult = mv98dx4251_cpu_ddr_ratios[opt][0 ];
*div = mv98dx4251_cpu_ddr_ratios[opt][1 ];
} else if (of_machine_is_compatible("marvell,armadaxp-98dx3236" )) {
*mult = mv98dx3236_cpu_ddr_ratios[opt][0 ];
*div = mv98dx3236_cpu_ddr_ratios[opt][1 ];
}
break ;
case MV98DX3236_CPU_TO_MPLL:
if (of_machine_is_compatible("marvell,armadaxp-98dx4251" )) {
*mult = mv98dx4251_cpu_mpll_ratios[opt][0 ];
*div = mv98dx4251_cpu_mpll_ratios[opt][1 ];
} else if (of_machine_is_compatible("marvell,armadaxp-98dx3236" )) {
*mult = mv98dx3236_cpu_mpll_ratios[opt][0 ];
*div = mv98dx3236_cpu_mpll_ratios[opt][1 ];
}
break ;
}
}
static const struct coreclk_soc_desc mv98dx3236_core_clocks = {
.get_tclk_freq = mv98dx3236_get_tclk_freq,
.get_cpu_freq = mv98dx3236_get_cpu_freq,
.get_clk_ratio = mv98dx3236_get_clk_ratio,
.ratios = mv98dx3236_core_ratios,
.num_ratios = ARRAY_SIZE(mv98dx3236_core_ratios),
};
/*
* Clock Gating Control
*/
static const struct clk_gating_soc_desc mv98dx3236_gating_desc[] __initconst = {
{ "ge1" , NULL, 3 , 0 },
{ "ge0" , NULL, 4 , 0 },
{ "pex00" , NULL, 5 , 0 },
{ "sdio" , NULL, 17 , 0 },
{ "usb0" , NULL, 18 , 0 },
{ "xor0" , NULL, 22 , 0 },
{ }
};
static void __init mv98dx3236_clk_init(struct device_node *np)
{
struct device_node *cgnp =
of_find_compatible_node(NULL, NULL, "marvell,mv98dx3236-gating-clock" );
mvebu_coreclk_setup(np, &mv98dx3236_core_clocks);
if (cgnp) {
mvebu_clk_gating_setup(cgnp, mv98dx3236_gating_desc);
of_node_put(cgnp);
}
}
CLK_OF_DECLARE(mv98dx3236_clk, "marvell,mv98dx3236-core-clock" , mv98dx3236_clk_init);
Messung V0.5 in Prozent C=98 H=100 G=98
¤ Dauer der Verarbeitung: 0.10 Sekunden
(vorverarbeitet am 2026-09-29)
¤
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