mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
2.6 KiB
101 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0-only |
|
/* |
|
* Copyright (C) 2014 Free Electrons |
|
* |
|
* Author: Boris BREZILLON <[email protected]> |
|
* |
|
* 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 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; |
|
|
|
data = of_device_get_match_data(&pdev->dev); |
|
if (!data) |
|
return -ENODEV; |
|
|
|
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);
|
|
|