Commit 33707260 authored by Chris Packham's avatar Chris Packham Committed by Stephen Boyd
Browse files

clk: mvebu: Expand mv98dx3236-core-clock support 



The initial implementation in commit e120c17a ("clk: mvebu: support
for 98DX3236 SoC") hardcoded a fixed value for the main PLL frequency.
Port code from the Marvell supplied Linux kernel to support different
PLL frequencies and provide clock gating support.

Signed-off-by: default avatarChris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent 48239135

drivers/clk/mvebu/Makefile

+1 −1
Original line number Diff line number Diff line
@@ -9,7 +9,7 @@ obj-$(CONFIG_ARMADA_39X_CLK) += armada-39x.o 
obj-$(CONFIG_ARMADA_37XX_CLK)	+= armada-37xx-xtal.o

obj-$(CONFIG_ARMADA_37XX_CLK)	+= armada-37xx-tbg.o

obj-$(CONFIG_ARMADA_37XX_CLK)	+= armada-37xx-periph.o

obj-$(CONFIG_ARMADA_XP_CLK)	+= armada-xp.o

obj-$(CONFIG_ARMADA_XP_CLK)	+= armada-xp.o mv98dx3236.o

obj-$(CONFIG_ARMADA_AP806_SYSCON) += ap806-system-controller.o

obj-$(CONFIG_ARMADA_CP110_SYSCON) += cp110-system-controller.o

obj-$(CONFIG_DOVE_CLK)		+= dove.o dove-divider.o

drivers/clk/mvebu/armada-xp.c

+0 −13
Original line number Diff line number Diff line
@@ -232,16 +232,3 @@ static void __init axp_clk_init(struct device_node *np) 
		mvebu_clk_gating_setup(cgnp, axp_gating_desc);

}

CLK_OF_DECLARE(axp_clk, "marvell,armada-xp-core-clock", axp_clk_init);
 


static void __init mv98dx3236_clk_init(struct device_node *np)

{

	struct device_node *cgnp =

		of_find_compatible_node(NULL, NULL, "marvell,armada-xp-gating-clock");



	mvebu_coreclk_setup(np, &mv98dx3236_coreclks);



	if (cgnp)

		mvebu_clk_gating_setup(cgnp, mv98dx3236_gating_desc);

}

CLK_OF_DECLARE(mv98dx3236_clk, "marvell,mv98dx3236-core-clock",

	       mv98dx3236_clk_init);

drivers/clk/mvebu/mv98dx3236.c

0 → 100644
+180 −0
Original line number Diff line number Diff line 
/*

 * 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);

}

CLK_OF_DECLARE(mv98dx3236_clk, "marvell,mv98dx3236-core-clock", mv98dx3236_clk_init);

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