1. 根目录:
2. drivers
3. clk
4. mvebu
5. armada-375.c

/*
 * 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);