Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 | /*
* Marvell Armada 37xx SoC Time Base Generator clocks
*
* Copyright (C) 2016 Marvell
*
* Gregory CLEMENT <gregory.clement@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2 or later. This program is licensed "as is"
* without any warranty of any kind, whether express or implied.
*/
#include <linux/clk-provider.h>
#include <linux/clk.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, sizeof(*hw_tbg_data)
+ sizeof(*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 = devm_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);
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);
|