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clk: meson: Add GXBB AO Clock and Reset controller driver

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Adds a Clock and Reset controller driver for the Always-On part
of the Amlogic Meson GXBB SoC.

It exports paired Clocks and Resets lines that will be used by
peripherals in the Always-On subsystem.

Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Neil Armstrong 2016-08-18 12:08:46 +02:00 committed by Stephen Boyd
parent edb89f126f
commit f8c11f7991
2 changed files with 192 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/clk/meson/Makefile
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@ -4,4 +4,4 @@
obj-$(CONFIG_COMMON_CLK_AMLOGIC) += clk-pll.o clk-cpu.o clk-mpll.o
obj-$(CONFIG_COMMON_CLK_MESON8B) += meson8b-clkc.o
obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o
obj-$(CONFIG_COMMON_CLK_GXBB) += gxbb.o gxbb-aoclk.o

191
drivers/clk/meson/gxbb-aoclk.c Normal file
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@ -0,0 +1,191 @@
/*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright (c) 2016 BayLibre, SAS.
* Author: Neil Armstrong <narmstrong@baylibre.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
* The full GNU General Public License is included in this distribution
* in the file called COPYING.
*
* BSD LICENSE
*
* Copyright (c) 2016 BayLibre, SAS.
* Author: Neil Armstrong <narmstrong@baylibre.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <linux/clk-provider.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/init.h>
#include <dt-bindings/clock/gxbb-aoclkc.h>
#include <dt-bindings/reset/gxbb-aoclkc.h>
static DEFINE_SPINLOCK(gxbb_aoclk_lock);
struct gxbb_aoclk_reset_controller {
struct reset_controller_dev reset;
unsigned int *data;
void __iomem *base;
};
static int gxbb_aoclk_do_reset(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct gxbb_aoclk_reset_controller *reset =
container_of(rcdev, struct gxbb_aoclk_reset_controller, reset);
writel(BIT(reset->data[id]), reset->base);
return 0;
}
static const struct reset_control_ops gxbb_aoclk_reset_ops = {
.reset = gxbb_aoclk_do_reset,
};
#define GXBB_AO_GATE(_name, _bit) \
static struct clk_gate _name##_ao = { \
.reg = (void __iomem *)0, \
.bit_idx = (_bit), \
.lock = &gxbb_aoclk_lock, \
.hw.init = &(struct clk_init_data) { \
.name = #_name "_ao", \
.ops = &clk_gate_ops, \
.parent_names = (const char *[]){ "clk81" }, \
.num_parents = 1, \
.flags = (CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED), \
}, \
}
GXBB_AO_GATE(remote, 0);
GXBB_AO_GATE(i2c_master, 1);
GXBB_AO_GATE(i2c_slave, 2);
GXBB_AO_GATE(uart1, 3);
GXBB_AO_GATE(uart2, 5);
GXBB_AO_GATE(ir_blaster, 6);
static unsigned int gxbb_aoclk_reset[] = {
[RESET_AO_REMOTE] = 16,
[RESET_AO_I2C_MASTER] = 18,
[RESET_AO_I2C_SLAVE] = 19,
[RESET_AO_UART1] = 17,
[RESET_AO_UART2] = 22,
[RESET_AO_IR_BLASTER] = 23,
};
static struct clk_gate *gxbb_aoclk_gate[] = {
[CLKID_AO_REMOTE] = &remote_ao,
[CLKID_AO_I2C_MASTER] = &i2c_master_ao,
[CLKID_AO_I2C_SLAVE] = &i2c_slave_ao,
[CLKID_AO_UART1] = &uart1_ao,
[CLKID_AO_UART2] = &uart2_ao,
[CLKID_AO_IR_BLASTER] = &ir_blaster_ao,
};
static struct clk_hw_onecell_data gxbb_aoclk_onecell_data = {
.hws = {
[CLKID_AO_REMOTE] = &remote_ao.hw,
[CLKID_AO_I2C_MASTER] = &i2c_master_ao.hw,
[CLKID_AO_I2C_SLAVE] = &i2c_slave_ao.hw,
[CLKID_AO_UART1] = &uart1_ao.hw,
[CLKID_AO_UART2] = &uart2_ao.hw,
[CLKID_AO_IR_BLASTER] = &ir_blaster_ao.hw,
},
.num = ARRAY_SIZE(gxbb_aoclk_gate),
};
static int gxbb_aoclkc_probe(struct platform_device *pdev)
{
struct resource *res;
void __iomem *base;
int ret, clkid;
struct device *dev = &pdev->dev;
struct gxbb_aoclk_reset_controller *rstc;
rstc = devm_kzalloc(dev, sizeof(rstc), GFP_KERNEL);
if (!rstc)
return -ENOMEM;
/* Generic clocks */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
/* Reset Controller */
rstc->base = base;
rstc->data = gxbb_aoclk_reset;
rstc->reset.ops = &gxbb_aoclk_reset_ops;
rstc->reset.nr_resets = ARRAY_SIZE(gxbb_aoclk_reset);
rstc->reset.of_node = dev->of_node;
ret = devm_reset_controller_register(dev, &rstc->reset);
/*
* Populate base address and register all clks
*/
for (clkid = 0; clkid < gxbb_aoclk_onecell_data.num; clkid++) {
gxbb_aoclk_gate[clkid]->reg = base;
ret = devm_clk_hw_register(dev,
gxbb_aoclk_onecell_data.hws[clkid]);
if (ret)
return ret;
}
return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
&gxbb_aoclk_onecell_data);
}
static const struct of_device_id gxbb_aoclkc_match_table[] = {
{ .compatible = "amlogic,gxbb-aoclkc" },
{ }
};
static struct platform_driver gxbb_aoclkc_driver = {
.probe = gxbb_aoclkc_probe,
.driver = {
.name = "gxbb-aoclkc",
.of_match_table = gxbb_aoclkc_match_table,
},
};
builtin_platform_driver(gxbb_aoclkc_driver);