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/*
* Marvell Armada 39x SoC clocks
*
* Copyright (C) 2015 Marvell
*
* Gregory CLEMENT <gregory.clement@free-electrons.com>
* Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
* Andrew Lunn <andrew@lunn.ch>
* Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
*
* 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"
/*
* SARL[14:10] : Ratios between CPU, NBCLK, HCLK and DCLK.
*
* SARL[15] : TCLK frequency
* 0 = 250 MHz
* 1 = 200 MHz
*
* SARH[0] : Reference clock frequency
* 0 = 25 Mhz
* 1 = 40 Mhz
*/
#define SARL 0
#define SARL_A390_TCLK_FREQ_OPT 15
#define SARL_A390_TCLK_FREQ_OPT_MASK 0x1
#define SARL_A390_CPU_DDR_L2_FREQ_OPT 10
#define SARL_A390_CPU_DDR_L2_FREQ_OPT_MASK 0x1F
#define SARH 4
#define SARH_A390_REFCLK_FREQ BIT(0)
static const u32 armada_39x_tclk_frequencies[] __initconst = {
250000000,
200000000,
};
static u32 __init armada_39x_get_tclk_freq(void __iomem *sar)
{
u8 tclk_freq_select;
tclk_freq_select = ((readl(sar + SARL) >> SARL_A390_TCLK_FREQ_OPT) &
SARL_A390_TCLK_FREQ_OPT_MASK);
return armada_39x_tclk_frequencies[tclk_freq_select];
}
static const u32 armada_39x_cpu_frequencies[] __initconst = {
[0x0] = 666 * 1000 * 1000,
[0x2] = 800 * 1000 * 1000,
[0x3] = 800 * 1000 * 1000,
[0x4] = 1066 * 1000 * 1000,
[0x5] = 1066 * 1000 * 1000,
[0x6] = 1200 * 1000 * 1000,
[0x8] = 1332 * 1000 * 1000,
[0xB] = 1600 * 1000 * 1000,
[0xC] = 1600 * 1000 * 1000,
[0x12] = 1800 * 1000 * 1000,
[0x1E] = 1800 * 1000 * 1000,
};
static u32 __init armada_39x_get_cpu_freq(void __iomem *sar)
{
u8 cpu_freq_select;
cpu_freq_select = ((readl(sar + SARL) >> SARL_A390_CPU_DDR_L2_FREQ_OPT) &
SARL_A390_CPU_DDR_L2_FREQ_OPT_MASK);
if (cpu_freq_select >= ARRAY_SIZE(armada_39x_cpu_frequencies)) {
pr_err("Selected CPU frequency (%d) unsupported\n",
cpu_freq_select);
return 0;
}
return armada_39x_cpu_frequencies[cpu_freq_select];
}
enum { A390_CPU_TO_NBCLK, A390_CPU_TO_HCLK, A390_CPU_TO_DCLK };
static const struct coreclk_ratio armada_39x_coreclk_ratios[] __initconst = {
{ .id = A390_CPU_TO_NBCLK, .name = "nbclk" },
{ .id = A390_CPU_TO_HCLK, .name = "hclk" },
{ .id = A390_CPU_TO_DCLK, .name = "dclk" },
};
static void __init armada_39x_get_clk_ratio(
void __iomem *sar, int id, int *mult, int *div)
{
switch (id) {
case A390_CPU_TO_NBCLK:
*mult = 1;
*div = 2;
break;
case A390_CPU_TO_HCLK:
*mult = 1;
*div = 4;
break;
case A390_CPU_TO_DCLK:
*mult = 1;
*div = 2;
break;
}
}
static u32 __init armada_39x_refclk_ratio(void __iomem *sar)
{
if (readl(sar + SARH) & SARH_A390_REFCLK_FREQ)
return 40 * 1000 * 1000;
else
return 25 * 1000 * 1000;
}
static const struct coreclk_soc_desc armada_39x_coreclks = {
.get_tclk_freq = armada_39x_get_tclk_freq,
.get_cpu_freq = armada_39x_get_cpu_freq,
.get_clk_ratio = armada_39x_get_clk_ratio,
.get_refclk_freq = armada_39x_refclk_ratio,
.ratios = armada_39x_coreclk_ratios,
.num_ratios = ARRAY_SIZE(armada_39x_coreclk_ratios),
};
static void __init armada_39x_coreclk_init(struct device_node *np)
{
mvebu_coreclk_setup(np, &armada_39x_coreclks);
}
CLK_OF_DECLARE(armada_39x_core_clk, "marvell,armada-390-core-clock",
armada_39x_coreclk_init);
/*
* Clock Gating Control
*/
static const struct clk_gating_soc_desc armada_39x_gating_desc[] __initconst = {
{ "pex1", NULL, 5 },
{ "pex2", NULL, 6 },
{ "pex3", NULL, 7 },
{ "pex0", NULL, 8 },
{ "usb3h0", NULL, 9 },
{ "sdio", NULL, 17 },
{ "xor0", NULL, 22 },
{ "xor1", NULL, 28 },
{ }
};
static void __init armada_39x_clk_gating_init(struct device_node *np)
{
mvebu_clk_gating_setup(np, armada_39x_gating_desc);
}
CLK_OF_DECLARE(armada_39x_clk_gating, "marvell,armada-390-gating-clock",
armada_39x_clk_gating_init);
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