提交 ab6e23a4 编写于 作者: J Jens Kuske 提交者: Maxime Ripard

clk: sunxi: Add H3 clocks support

The H3 clock control unit is similar to the those of other sun8i family
members like the A23.

It adds a new bus gates clock similar to the simple gates, but with a
different parent clock for each single gate.
Some of the gates use the new AHB2 clock as parent, whose clock source
is muxable between AHB1 and PLL6/2. The documentation isn't totally clear
about which devices belong to AHB2 now, especially USB EHIC/OHIC, so it
is mostly based on Allwinner kernel source code.
Signed-off-by: NJens Kuske <jenskuske@gmail.com>
Acked-by: NRob Herring <robh@kernel.org>
Signed-off-by: NMaxime Ripard <maxime.ripard@free-electrons.com>
上级 6d3a47c2
......@@ -29,6 +29,7 @@ Required properties:
"allwinner,sun6i-a31-ar100-clk" - for the AR100 on A31
"allwinner,sun9i-a80-cpus-clk" - for the CPUS on A80
"allwinner,sun6i-a31-ahb1-clk" - for the AHB1 clock on A31
"allwinner,sun8i-h3-ahb2-clk" - for the AHB2 clock on H3
"allwinner,sun6i-a31-ahb1-gates-clk" - for the AHB1 gates on A31
"allwinner,sun8i-a23-ahb1-gates-clk" - for the AHB1 gates on A23
"allwinner,sun9i-a80-ahb0-gates-clk" - for the AHB0 gates on A80
......@@ -56,6 +57,7 @@ Required properties:
"allwinner,sun9i-a80-apb1-gates-clk" - for the APB1 gates on A80
"allwinner,sun6i-a31-apb2-gates-clk" - for the APB2 gates on A31
"allwinner,sun8i-a23-apb2-gates-clk" - for the APB2 gates on A23
"allwinner,sun8i-h3-bus-gates-clk" - for the bus gates on H3
"allwinner,sun9i-a80-apbs-gates-clk" - for the APBS gates on A80
"allwinner,sun4i-a10-dram-gates-clk" - for the DRAM gates on A10
"allwinner,sun5i-a13-mbus-clk" - for the MBUS clock on A13
......
......@@ -10,6 +10,7 @@ obj-y += clk-a10-pll2.o
obj-y += clk-a20-gmac.o
obj-y += clk-mod0.o
obj-y += clk-simple-gates.o
obj-y += clk-sun8i-bus-gates.o
obj-y += clk-sun8i-mbus.o
obj-y += clk-sun9i-core.o
obj-y += clk-sun9i-mmc.o
......
/*
* Copyright (C) 2015 Jens Kuske <jenskuske@gmail.com>
*
* Based on clk-simple-gates.c, which is:
* Copyright 2015 Maxime Ripard
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
static DEFINE_SPINLOCK(gates_lock);
static void __init sun8i_h3_bus_gates_init(struct device_node *node)
{
static const char * const names[] = { "ahb1", "ahb2", "apb1", "apb2" };
enum { AHB1, AHB2, APB1, APB2, PARENT_MAX } clk_parent;
const char *parents[PARENT_MAX];
struct clk_onecell_data *clk_data;
const char *clk_name;
struct property *prop;
struct resource res;
void __iomem *clk_reg;
void __iomem *reg;
const __be32 *p;
int number, i;
u8 clk_bit;
u32 index;
reg = of_io_request_and_map(node, 0, of_node_full_name(node));
if (IS_ERR(reg))
return;
for (i = 0; i < ARRAY_SIZE(names); i++) {
index = of_property_match_string(node, "clock-names",
names[i]);
if (index < 0)
return;
parents[i] = of_clk_get_parent_name(node, index);
}
clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
if (!clk_data)
goto err_unmap;
number = of_property_count_u32_elems(node, "clock-indices");
of_property_read_u32_index(node, "clock-indices", number - 1, &number);
clk_data->clks = kcalloc(number + 1, sizeof(struct clk *), GFP_KERNEL);
if (!clk_data->clks)
goto err_free_data;
i = 0;
of_property_for_each_u32(node, "clock-indices", prop, p, index) {
of_property_read_string_index(node, "clock-output-names",
i, &clk_name);
if (index == 17 || (index >= 29 && index <= 31))
clk_parent = AHB2;
else if (index <= 63 || index >= 128)
clk_parent = AHB1;
else if (index >= 64 && index <= 95)
clk_parent = APB1;
else if (index >= 96 && index <= 127)
clk_parent = APB2;
clk_reg = reg + 4 * (index / 32);
clk_bit = index % 32;
clk_data->clks[index] = clk_register_gate(NULL, clk_name,
parents[clk_parent],
0, clk_reg, clk_bit,
0, &gates_lock);
i++;
if (IS_ERR(clk_data->clks[index])) {
WARN_ON(true);
continue;
}
}
clk_data->clk_num = number + 1;
of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
return;
err_free_data:
kfree(clk_data);
err_unmap:
iounmap(reg);
of_address_to_resource(node, 0, &res);
release_mem_region(res.start, resource_size(&res));
}
CLK_OF_DECLARE(sun8i_h3_bus_gates, "allwinner,sun8i-h3-bus-gates-clk",
sun8i_h3_bus_gates_init);
......@@ -778,6 +778,10 @@ static const struct mux_data sun6i_a31_ahb1_mux_data __initconst = {
.shift = 12,
};
static const struct mux_data sun8i_h3_ahb2_mux_data __initconst = {
.shift = 0,
};
static void __init sunxi_mux_clk_setup(struct device_node *node,
struct mux_data *data)
{
......@@ -1130,6 +1134,7 @@ static const struct of_device_id clk_divs_match[] __initconst = {
static const struct of_device_id clk_mux_match[] __initconst = {
{.compatible = "allwinner,sun4i-a10-cpu-clk", .data = &sun4i_cpu_mux_data,},
{.compatible = "allwinner,sun6i-a31-ahb1-mux-clk", .data = &sun6i_a31_ahb1_mux_data,},
{.compatible = "allwinner,sun8i-h3-ahb2-clk", .data = &sun8i_h3_ahb2_mux_data,},
{}
};
......@@ -1212,6 +1217,7 @@ CLK_OF_DECLARE(sun6i_a31_clk_init, "allwinner,sun6i-a31", sun6i_init_clocks);
CLK_OF_DECLARE(sun6i_a31s_clk_init, "allwinner,sun6i-a31s", sun6i_init_clocks);
CLK_OF_DECLARE(sun8i_a23_clk_init, "allwinner,sun8i-a23", sun6i_init_clocks);
CLK_OF_DECLARE(sun8i_a33_clk_init, "allwinner,sun8i-a33", sun6i_init_clocks);
CLK_OF_DECLARE(sun8i_h3_clk_init, "allwinner,sun8i-h3", sun6i_init_clocks);
static void __init sun9i_init_clocks(struct device_node *node)
{
......
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