158 lines
3.7 KiB
C
158 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Marvell Armada 37xx SoC Time Base Generator clocks
|
|
*
|
|
* Copyright (C) 2016 Marvell
|
|
*
|
|
* Gregory CLEMENT <gregory.clement@free-electrons.com>
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/io.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
|
|
#define NUM_TBG 4
|
|
|
|
#define TBG_CTRL0 0x4
|
|
#define TBG_CTRL1 0x8
|
|
#define TBG_CTRL7 0x20
|
|
#define TBG_CTRL8 0x30
|
|
|
|
#define TBG_DIV_MASK 0x1FF
|
|
|
|
#define TBG_A_REFDIV 0
|
|
#define TBG_B_REFDIV 16
|
|
|
|
#define TBG_A_FBDIV 2
|
|
#define TBG_B_FBDIV 18
|
|
|
|
#define TBG_A_VCODIV_SE 0
|
|
#define TBG_B_VCODIV_SE 16
|
|
|
|
#define TBG_A_VCODIV_DIFF 1
|
|
#define TBG_B_VCODIV_DIFF 17
|
|
|
|
struct tbg_def {
|
|
char *name;
|
|
u32 refdiv_offset;
|
|
u32 fbdiv_offset;
|
|
u32 vcodiv_reg;
|
|
u32 vcodiv_offset;
|
|
};
|
|
|
|
static const struct tbg_def tbg[NUM_TBG] = {
|
|
{"TBG-A-P", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL8, TBG_A_VCODIV_DIFF},
|
|
{"TBG-B-P", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL8, TBG_B_VCODIV_DIFF},
|
|
{"TBG-A-S", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL1, TBG_A_VCODIV_SE},
|
|
{"TBG-B-S", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL1, TBG_B_VCODIV_SE},
|
|
};
|
|
|
|
static unsigned int tbg_get_mult(void __iomem *reg, const struct tbg_def *ptbg)
|
|
{
|
|
u32 val;
|
|
|
|
val = readl(reg + TBG_CTRL0);
|
|
|
|
return ((val >> ptbg->fbdiv_offset) & TBG_DIV_MASK) << 2;
|
|
}
|
|
|
|
static unsigned int tbg_get_div(void __iomem *reg, const struct tbg_def *ptbg)
|
|
{
|
|
u32 val;
|
|
unsigned int div;
|
|
|
|
val = readl(reg + TBG_CTRL7);
|
|
|
|
div = (val >> ptbg->refdiv_offset) & TBG_DIV_MASK;
|
|
if (div == 0)
|
|
div = 1;
|
|
val = readl(reg + ptbg->vcodiv_reg);
|
|
|
|
div *= 1 << ((val >> ptbg->vcodiv_offset) & TBG_DIV_MASK);
|
|
|
|
return div;
|
|
}
|
|
|
|
|
|
static int armada_3700_tbg_clock_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct clk_hw_onecell_data *hw_tbg_data;
|
|
struct device *dev = &pdev->dev;
|
|
const char *parent_name;
|
|
struct resource *res;
|
|
struct clk *parent;
|
|
void __iomem *reg;
|
|
int i, ret;
|
|
|
|
hw_tbg_data = devm_kzalloc(&pdev->dev,
|
|
struct_size(hw_tbg_data, hws, NUM_TBG),
|
|
GFP_KERNEL);
|
|
if (!hw_tbg_data)
|
|
return -ENOMEM;
|
|
hw_tbg_data->num = NUM_TBG;
|
|
platform_set_drvdata(pdev, hw_tbg_data);
|
|
|
|
parent = clk_get(dev, NULL);
|
|
if (IS_ERR(parent)) {
|
|
dev_err(dev, "Could get the clock parent\n");
|
|
return -EINVAL;
|
|
}
|
|
parent_name = __clk_get_name(parent);
|
|
clk_put(parent);
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
reg = devm_ioremap_resource(dev, res);
|
|
if (IS_ERR(reg))
|
|
return PTR_ERR(reg);
|
|
|
|
for (i = 0; i < NUM_TBG; i++) {
|
|
const char *name;
|
|
unsigned int mult, div;
|
|
|
|
name = tbg[i].name;
|
|
mult = tbg_get_mult(reg, &tbg[i]);
|
|
div = tbg_get_div(reg, &tbg[i]);
|
|
hw_tbg_data->hws[i] = clk_hw_register_fixed_factor(NULL, name,
|
|
parent_name, 0, mult, div);
|
|
if (IS_ERR(hw_tbg_data->hws[i]))
|
|
dev_err(dev, "Can't register TBG clock %s\n", name);
|
|
}
|
|
|
|
ret = of_clk_add_hw_provider(np, of_clk_hw_onecell_get, hw_tbg_data);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int armada_3700_tbg_clock_remove(struct platform_device *pdev)
|
|
{
|
|
int i;
|
|
struct clk_hw_onecell_data *hw_tbg_data = platform_get_drvdata(pdev);
|
|
|
|
of_clk_del_provider(pdev->dev.of_node);
|
|
for (i = 0; i < hw_tbg_data->num; i++)
|
|
clk_hw_unregister_fixed_factor(hw_tbg_data->hws[i]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id armada_3700_tbg_clock_of_match[] = {
|
|
{ .compatible = "marvell,armada-3700-tbg-clock", },
|
|
{ }
|
|
};
|
|
|
|
static struct platform_driver armada_3700_tbg_clock_driver = {
|
|
.probe = armada_3700_tbg_clock_probe,
|
|
.remove = armada_3700_tbg_clock_remove,
|
|
.driver = {
|
|
.name = "marvell-armada-3700-tbg-clock",
|
|
.of_match_table = armada_3700_tbg_clock_of_match,
|
|
},
|
|
};
|
|
|
|
builtin_platform_driver(armada_3700_tbg_clock_driver);
|