reset: Add i.MX7 SRC reset driver

Add reset controller driver exposing various reset faculties,
implemented by System Reset Controller IP block.

Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Andrey Smirnov 2017-02-21 08:13:31 -08:00 committed by Philipp Zabel
parent d518d9cab1
commit abf97755ae
5 changed files with 276 additions and 0 deletions

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Freescale i.MX7 System Reset Controller
======================================
Please also refer to reset.txt in this directory for common reset
controller binding usage.
Required properties:
- compatible: Should be "fsl,imx7-src", "syscon"
- reg: should be register base and length as documented in the
datasheet
- interrupts: Should contain SRC interrupt
- #reset-cells: 1, see below
example:
src: reset-controller@30390000 {
compatible = "fsl,imx7d-src", "syscon";
reg = <0x30390000 0x2000>;
interrupts = <GIC_SPI 89 IRQ_TYPE_LEVEL_HIGH>;
#reset-cells = <1>;
};
Specifying reset lines connected to IP modules
==============================================
The system reset controller can be used to reset various set of
peripherals. Device nodes that need access to reset lines should
specify them as a reset phandle in their corresponding node as
specified in reset.txt.
Example:
pcie: pcie@33800000 {
...
resets = <&src IMX7_RESET_PCIEPHY>,
<&src IMX7_RESET_PCIE_CTRL_APPS_EN>;
reset-names = "pciephy", "apps";
...
};
For list of all valid reset indicies see
<dt-bindings/reset/imx7-reset.h>

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@ -27,6 +27,13 @@ config RESET_BERLIN
help
This enables the reset controller driver for Marvell Berlin SoCs.
config RESET_IMX7
bool "i.MX7 Reset Driver" if COMPILE_TEST
default SOC_IMX7D
select MFD_SYSCON
help
This enables the reset controller driver for i.MX7 SoCs.
config RESET_LPC18XX
bool "LPC18xx/43xx Reset Driver" if COMPILE_TEST
default ARCH_LPC18XX

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@ -4,6 +4,7 @@ obj-$(CONFIG_ARCH_STI) += sti/
obj-$(CONFIG_ARCH_TEGRA) += tegra/
obj-$(CONFIG_RESET_ATH79) += reset-ath79.o
obj-$(CONFIG_RESET_BERLIN) += reset-berlin.o
obj-$(CONFIG_RESET_IMX7) += reset-imx7.o
obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o
obj-$(CONFIG_RESET_MESON) += reset-meson.o
obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
@ -15,3 +16,4 @@ obj-$(CONFIG_TI_SYSCON_RESET) += reset-ti-syscon.o
obj-$(CONFIG_RESET_UNIPHIER) += reset-uniphier.o
obj-$(CONFIG_RESET_ZX2967) += reset-zx2967.o
obj-$(CONFIG_RESET_ZYNQ) += reset-zynq.o

158
drivers/reset/reset-imx7.c Normal file
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/*
* Copyright (c) 2017, Impinj, Inc.
*
* i.MX7 System Reset Controller (SRC) driver
*
* Author: Andrey Smirnov <andrew.smirnov@gmail.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; version 2 of the License.
*
* 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/mfd/syscon.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/regmap.h>
#include <dt-bindings/reset/imx7-reset.h>
struct imx7_src {
struct reset_controller_dev rcdev;
struct regmap *regmap;
};
enum imx7_src_registers {
SRC_A7RCR0 = 0x0004,
SRC_M4RCR = 0x000c,
SRC_ERCR = 0x0014,
SRC_HSICPHY_RCR = 0x001c,
SRC_USBOPHY1_RCR = 0x0020,
SRC_USBOPHY2_RCR = 0x0024,
SRC_MIPIPHY_RCR = 0x0028,
SRC_PCIEPHY_RCR = 0x002c,
SRC_DDRC_RCR = 0x1000,
};
struct imx7_src_signal {
unsigned int offset, bit;
};
static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
[IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
[IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
[IMX7_RESET_A7_CORE_RESET0] = { SRC_A7RCR0, BIT(4) },
[IMX7_RESET_A7_CORE_RESET1] = { SRC_A7RCR0, BIT(5) },
[IMX7_RESET_A7_DBG_RESET0] = { SRC_A7RCR0, BIT(8) },
[IMX7_RESET_A7_DBG_RESET1] = { SRC_A7RCR0, BIT(9) },
[IMX7_RESET_A7_ETM_RESET0] = { SRC_A7RCR0, BIT(12) },
[IMX7_RESET_A7_ETM_RESET1] = { SRC_A7RCR0, BIT(13) },
[IMX7_RESET_A7_SOC_DBG_RESET] = { SRC_A7RCR0, BIT(20) },
[IMX7_RESET_A7_L2RESET] = { SRC_A7RCR0, BIT(21) },
[IMX7_RESET_SW_M4C_RST] = { SRC_M4RCR, BIT(1) },
[IMX7_RESET_SW_M4P_RST] = { SRC_M4RCR, BIT(2) },
[IMX7_RESET_EIM_RST] = { SRC_ERCR, BIT(0) },
[IMX7_RESET_HSICPHY_PORT_RST] = { SRC_HSICPHY_RCR, BIT(1) },
[IMX7_RESET_USBPHY1_POR] = { SRC_USBOPHY1_RCR, BIT(0) },
[IMX7_RESET_USBPHY1_PORT_RST] = { SRC_USBOPHY1_RCR, BIT(1) },
[IMX7_RESET_USBPHY2_POR] = { SRC_USBOPHY2_RCR, BIT(0) },
[IMX7_RESET_USBPHY2_PORT_RST] = { SRC_USBOPHY2_RCR, BIT(1) },
[IMX7_RESET_MIPI_PHY_MRST] = { SRC_MIPIPHY_RCR, BIT(1) },
[IMX7_RESET_MIPI_PHY_SRST] = { SRC_MIPIPHY_RCR, BIT(2) },
[IMX7_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR, BIT(2) | BIT(1) },
[IMX7_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
[IMX7_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
[IMX7_RESET_DDRC_PRST] = { SRC_DDRC_RCR, BIT(0) },
[IMX7_RESET_DDRC_CORE_RST] = { SRC_DDRC_RCR, BIT(1) },
};
static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
{
return container_of(rcdev, struct imx7_src, rcdev);
}
static int imx7_reset_set(struct reset_controller_dev *rcdev,
unsigned long id, bool assert)
{
struct imx7_src *imx7src = to_imx7_src(rcdev);
const struct imx7_src_signal *signal = &imx7_src_signals[id];
unsigned int value = 0;
switch (id) {
case IMX7_RESET_PCIEPHY:
/*
* wait for more than 10us to release phy g_rst and
* btnrst
*/
if (!assert)
udelay(10);
break;
case IMX7_RESET_PCIE_CTRL_APPS_EN:
value = (assert) ? 0 : signal->bit;
break;
}
return regmap_update_bits(imx7src->regmap,
signal->offset, signal->bit, value);
}
static int imx7_reset_assert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return imx7_reset_set(rcdev, id, true);
}
static int imx7_reset_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return imx7_reset_set(rcdev, id, false);
}
static const struct reset_control_ops imx7_reset_ops = {
.assert = imx7_reset_assert,
.deassert = imx7_reset_deassert,
};
static int imx7_reset_probe(struct platform_device *pdev)
{
struct imx7_src *imx7src;
struct device *dev = &pdev->dev;
struct regmap_config config = { .name = "src" };
imx7src = devm_kzalloc(dev, sizeof(*imx7src), GFP_KERNEL);
if (!imx7src)
return -ENOMEM;
imx7src->regmap = syscon_node_to_regmap(dev->of_node);
if (IS_ERR(imx7src->regmap)) {
dev_err(dev, "Unable to get imx7-src regmap");
return PTR_ERR(imx7src->regmap);
}
regmap_attach_dev(dev, imx7src->regmap, &config);
imx7src->rcdev.owner = THIS_MODULE;
imx7src->rcdev.nr_resets = IMX7_RESET_NUM;
imx7src->rcdev.ops = &imx7_reset_ops;
imx7src->rcdev.of_node = dev->of_node;
return devm_reset_controller_register(dev, &imx7src->rcdev);
}
static const struct of_device_id imx7_reset_dt_ids[] = {
{ .compatible = "fsl,imx7d-src", },
{ /* sentinel */ },
};
static struct platform_driver imx7_reset_driver = {
.probe = imx7_reset_probe,
.driver = {
.name = KBUILD_MODNAME,
.of_match_table = imx7_reset_dt_ids,
},
};
builtin_platform_driver(imx7_reset_driver);

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/*
* Copyright (C) 2017 Impinj, Inc.
*
* Author: Andrey Smirnov <andrew.smirnov@gmail.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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/>.
*/
#ifndef DT_BINDING_RESET_IMX7_H
#define DT_BINDING_RESET_IMX7_H
#define IMX7_RESET_A7_CORE_POR_RESET0 0
#define IMX7_RESET_A7_CORE_POR_RESET1 1
#define IMX7_RESET_A7_CORE_RESET0 2
#define IMX7_RESET_A7_CORE_RESET1 3
#define IMX7_RESET_A7_DBG_RESET0 4
#define IMX7_RESET_A7_DBG_RESET1 5
#define IMX7_RESET_A7_ETM_RESET0 6
#define IMX7_RESET_A7_ETM_RESET1 7
#define IMX7_RESET_A7_SOC_DBG_RESET 8
#define IMX7_RESET_A7_L2RESET 9
#define IMX7_RESET_SW_M4C_RST 10
#define IMX7_RESET_SW_M4P_RST 11
#define IMX7_RESET_EIM_RST 12
#define IMX7_RESET_HSICPHY_PORT_RST 13
#define IMX7_RESET_USBPHY1_POR 14
#define IMX7_RESET_USBPHY1_PORT_RST 15
#define IMX7_RESET_USBPHY2_POR 16
#define IMX7_RESET_USBPHY2_PORT_RST 17
#define IMX7_RESET_MIPI_PHY_MRST 18
#define IMX7_RESET_MIPI_PHY_SRST 19
/*
* IMX7_RESET_PCIEPHY is a logical reset line combining PCIEPHY_BTN
* and PCIEPHY_G_RST
*/
#define IMX7_RESET_PCIEPHY 20
#define IMX7_RESET_PCIEPHY_PERST 21
/*
* IMX7_RESET_PCIE_CTRL_APPS_EN is not strictly a reset line, but it
* can be used to inhibit PCIe LTTSM, so, in a way, it can be thoguht
* of as one
*/
#define IMX7_RESET_PCIE_CTRL_APPS_EN 22
#define IMX7_RESET_DDRC_PRST 23
#define IMX7_RESET_DDRC_CORE_RST 24
#define IMX7_RESET_NUM 25
#endif