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/*
* 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>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/kernel.h>
#include <linux/clk-provider.h>
#include <linux/io.h>
#include <linux/of.h>
#include "common.h"
/*
* For 98DX4251 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 98DX3236 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 0x7
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);
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