105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2014 Free Electrons
|
|
*
|
|
* License Terms: GNU General Public License v2
|
|
* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
|
|
*
|
|
* Allwinner A31 APB0 clock gates driver
|
|
*
|
|
*/
|
|
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/init.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
|
|
#define SUN6I_APB0_GATES_MAX_SIZE 32
|
|
|
|
struct gates_data {
|
|
DECLARE_BITMAP(mask, SUN6I_APB0_GATES_MAX_SIZE);
|
|
};
|
|
|
|
static const struct gates_data sun6i_a31_apb0_gates __initconst = {
|
|
.mask = {0x7F},
|
|
};
|
|
|
|
static const struct gates_data sun8i_a23_apb0_gates __initconst = {
|
|
.mask = {0x5D},
|
|
};
|
|
|
|
static const struct of_device_id sun6i_a31_apb0_gates_clk_dt_ids[] = {
|
|
{ .compatible = "allwinner,sun6i-a31-apb0-gates-clk", .data = &sun6i_a31_apb0_gates },
|
|
{ .compatible = "allwinner,sun8i-a23-apb0-gates-clk", .data = &sun8i_a23_apb0_gates },
|
|
{ /* sentinel */ }
|
|
};
|
|
|
|
static int sun6i_a31_apb0_gates_clk_probe(struct platform_device *pdev)
|
|
{
|
|
struct device_node *np = pdev->dev.of_node;
|
|
struct clk_onecell_data *clk_data;
|
|
const struct of_device_id *device;
|
|
const struct gates_data *data;
|
|
const char *clk_parent;
|
|
const char *clk_name;
|
|
struct resource *r;
|
|
void __iomem *reg;
|
|
int ngates;
|
|
int i;
|
|
int j = 0;
|
|
|
|
if (!np)
|
|
return -ENODEV;
|
|
|
|
device = of_match_device(sun6i_a31_apb0_gates_clk_dt_ids, &pdev->dev);
|
|
if (!device)
|
|
return -ENODEV;
|
|
data = device->data;
|
|
|
|
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
reg = devm_ioremap_resource(&pdev->dev, r);
|
|
if (IS_ERR(reg))
|
|
return PTR_ERR(reg);
|
|
|
|
clk_parent = of_clk_get_parent_name(np, 0);
|
|
if (!clk_parent)
|
|
return -EINVAL;
|
|
|
|
clk_data = devm_kzalloc(&pdev->dev, sizeof(struct clk_onecell_data),
|
|
GFP_KERNEL);
|
|
if (!clk_data)
|
|
return -ENOMEM;
|
|
|
|
/* Worst-case size approximation and memory allocation */
|
|
ngates = find_last_bit(data->mask, SUN6I_APB0_GATES_MAX_SIZE);
|
|
clk_data->clks = devm_kcalloc(&pdev->dev, (ngates + 1),
|
|
sizeof(struct clk *), GFP_KERNEL);
|
|
if (!clk_data->clks)
|
|
return -ENOMEM;
|
|
|
|
for_each_set_bit(i, data->mask, SUN6I_APB0_GATES_MAX_SIZE) {
|
|
of_property_read_string_index(np, "clock-output-names",
|
|
j, &clk_name);
|
|
|
|
clk_data->clks[i] = clk_register_gate(&pdev->dev, clk_name,
|
|
clk_parent, 0, reg, i,
|
|
0, NULL);
|
|
WARN_ON(IS_ERR(clk_data->clks[i]));
|
|
|
|
j++;
|
|
}
|
|
|
|
clk_data->clk_num = ngates + 1;
|
|
|
|
return of_clk_add_provider(np, of_clk_src_onecell_get, clk_data);
|
|
}
|
|
|
|
static struct platform_driver sun6i_a31_apb0_gates_clk_driver = {
|
|
.driver = {
|
|
.name = "sun6i-a31-apb0-gates-clk",
|
|
.of_match_table = sun6i_a31_apb0_gates_clk_dt_ids,
|
|
},
|
|
.probe = sun6i_a31_apb0_gates_clk_probe,
|
|
};
|
|
builtin_platform_driver(sun6i_a31_apb0_gates_clk_driver);
|