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/*
* Marvell Armada 375 SoC clocks
*
* Copyright (C) 2014 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"
/*
* Core Clocks
*/
/*
* For the Armada 375 SoCs, the CPU, DDR and L2 clocks frequencies are
* all modified at the same time, and not separately as for the Armada
* 370 or the Armada XP SoCs.
*
* SAR1[21:17] : CPU frequency DDR frequency L2 frequency
* 6 = 400 MHz 400 MHz 200 MHz
* 15 = 600 MHz 600 MHz 300 MHz
* 21 = 800 MHz 534 MHz 400 MHz
* 25 = 1000 MHz 500 MHz 500 MHz
* others reserved.
*
* SAR1[22] : TCLK frequency
* 0 = 166 MHz
* 1 = 200 MHz
*/
#define SAR1_A375_TCLK_FREQ_OPT 22
#define SAR1_A375_TCLK_FREQ_OPT_MASK 0x1
#define SAR1_A375_CPU_DDR_L2_FREQ_OPT 17
#define SAR1_A375_CPU_DDR_L2_FREQ_OPT_MASK 0x1F
static const u32 armada_375_tclk_frequencies[] __initconst = {
166000000,
200000000,
};
static u32 __init armada_375_get_tclk_freq(void __iomem *sar)
{
u8 tclk_freq_select;
tclk_freq_select = ((readl(sar) >> SAR1_A375_TCLK_FREQ_OPT) &
SAR1_A375_TCLK_FREQ_OPT_MASK);
return armada_375_tclk_frequencies[tclk_freq_select];
}
static const u32 armada_375_cpu_frequencies[] __initconst = {
0, 0, 0, 0, 0, 0,
400000000,
0, 0, 0, 0, 0, 0, 0, 0,
600000000,
0, 0, 0, 0, 0,
800000000,
0, 0, 0,
1000000000,
};
static u32 __init armada_375_get_cpu_freq(void __iomem *sar)
{
u8 cpu_freq_select;
cpu_freq_select = ((readl(sar) >> SAR1_A375_CPU_DDR_L2_FREQ_OPT) &
SAR1_A375_CPU_DDR_L2_FREQ_OPT_MASK);
if (cpu_freq_select >= ARRAY_SIZE(armada_375_cpu_frequencies)) {
pr_err("Selected CPU frequency (%d) unsupported\n",
cpu_freq_select);
return 0;
} else
return armada_375_cpu_frequencies[cpu_freq_select];
}
enum { A375_CPU_TO_DDR, A375_CPU_TO_L2 };
static const struct coreclk_ratio armada_375_coreclk_ratios[] __initconst = {
{ .id = A375_CPU_TO_L2, .name = "l2clk" },
{ .id = A375_CPU_TO_DDR, .name = "ddrclk" },
};
static const int armada_375_cpu_l2_ratios[32][2] __initconst = {
{0, 1}, {0, 1}, {0, 1}, {0, 1},
{0, 1}, {0, 1}, {1, 2}, {0, 1},
{0, 1}, {0, 1}, {0, 1}, {0, 1},
{0, 1}, {0, 1}, {0, 1}, {1, 2},
{0, 1}, {0, 1}, {0, 1}, {0, 1},
{0, 1}, {1, 2}, {0, 1}, {0, 1},
{0, 1}, {1, 2}, {0, 1}, {0, 1},
{0, 1}, {0, 1}, {0, 1}, {0, 1},
};
static const int armada_375_cpu_ddr_ratios[32][2] __initconst = {
{0, 1}, {0, 1}, {0, 1}, {0, 1},
{0, 1}, {0, 1}, {1, 1}, {0, 1},
{0, 1}, {0, 1}, {0, 1}, {0, 1},
{0, 1}, {0, 1}, {0, 1}, {2, 3},
{0, 1}, {0, 1}, {0, 1}, {0, 1},
{0, 1}, {2, 3}, {0, 1}, {0, 1},
{0, 1}, {1, 2}, {0, 1}, {0, 1},
{0, 1}, {0, 1}, {0, 1}, {0, 1},
};
static void __init armada_375_get_clk_ratio(
void __iomem *sar, int id, int *mult, int *div)
{
u32 opt = ((readl(sar) >> SAR1_A375_CPU_DDR_L2_FREQ_OPT) &
SAR1_A375_CPU_DDR_L2_FREQ_OPT_MASK);
switch (id) {
case A375_CPU_TO_L2:
*mult = armada_375_cpu_l2_ratios[opt][0];
*div = armada_375_cpu_l2_ratios[opt][1];
break;
case A375_CPU_TO_DDR:
*mult = armada_375_cpu_ddr_ratios[opt][0];
*div = armada_375_cpu_ddr_ratios[opt][1];
break;
}
}
static const struct coreclk_soc_desc armada_375_coreclks = {
.get_tclk_freq = armada_375_get_tclk_freq,
.get_cpu_freq = armada_375_get_cpu_freq,
.get_clk_ratio = armada_375_get_clk_ratio,
.ratios = armada_375_coreclk_ratios,
.num_ratios = ARRAY_SIZE(armada_375_coreclk_ratios),
};
static void __init armada_375_coreclk_init(struct device_node *np)
{
mvebu_coreclk_setup(np, &armada_375_coreclks);
}
CLK_OF_DECLARE(armada_375_core_clk, "marvell,armada-375-core-clock",
armada_375_coreclk_init);
/*
* Clock Gating Control
*/
static const struct clk_gating_soc_desc armada_375_gating_desc[] __initconst = {
{ "mu", NULL, 2 },
{ "pp", NULL, 3 },
{ "ptp", NULL, 4 },
{ "pex0", NULL, 5 },
{ "pex1", NULL, 6 },
{ "audio", NULL, 8 },
{ "nd_clk", "nand", 11 },
{ "sata0_link", "sata0_core", 14 },
{ "sata0_core", NULL, 15 },
{ "usb3", NULL, 16 },
{ "sdio", NULL, 17 },
{ "usb", NULL, 18 },
{ "gop", NULL, 19 },
{ "sata1_link", "sata1_core", 20 },
{ "sata1_core", NULL, 21 },
{ "xor0", NULL, 22 },
{ "xor1", NULL, 23 },
{ "copro", NULL, 24 },
{ "tdm", NULL, 25 },
{ "crypto0_enc", NULL, 28 },
{ "crypto0_core", NULL, 29 },
{ "crypto1_enc", NULL, 30 },
{ "crypto1_core", NULL, 31 },
{ }
};
static void __init armada_375_clk_gating_init(struct device_node *np)
{
mvebu_clk_gating_setup(np, armada_375_gating_desc);
}
CLK_OF_DECLARE(armada_375_clk_gating, "marvell,armada-375-gating-clock",
armada_375_clk_gating_init);
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