redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

clk: mvebu: add Marvell Armada 39x driver 

This commit adds a new clock driver for the Marvell Armada 39x family
of processors. This driver is fairly similar to the ones already used
on other Marvell EBU processors, with the following main differences:

 * Different set of ratios
 * Different set of core clocks
 * Configurable reference clock in frequency

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
hifive-unleashed-5.1
Thomas Petazzoni 2015-03-03 15:41:09 +01:00 committed by Gregory CLEMENT
parent 42b5f40610
commit 8da6f3c166
3 changed files with 161 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/clk/mvebu/Kconfig
View File

@ -21,6 +21,10 @@ config ARMADA_38X_CLK
bool
select MVEBU_CLK_COMMON
config ARMADA_39X_CLK
bool
select MVEBU_CLK_COMMON
config ARMADA_XP_CLK
bool
select MVEBU_CLK_COMMON

1
drivers/clk/mvebu/Makefile
View File

@ -5,6 +5,7 @@ obj-$(CONFIG_MVEBU_CLK_COREDIV) += clk-corediv.o
obj-$(CONFIG_ARMADA_370_CLK) += armada-370.o
obj-$(CONFIG_ARMADA_375_CLK) += armada-375.o
obj-$(CONFIG_ARMADA_38X_CLK) += armada-38x.o
obj-$(CONFIG_ARMADA_39X_CLK) += armada-39x.o
obj-$(CONFIG_ARMADA_XP_CLK) += armada-xp.o
obj-$(CONFIG_DOVE_CLK) += dove.o
obj-$(CONFIG_KIRKWOOD_CLK) += kirkwood.o

156
drivers/clk/mvebu/armada-39x.c 100644
View File

@ -0,0 +1,156 @@
/*
* 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);