161 lines
4.9 KiB
C
161 lines
4.9 KiB
C
/*
|
|
* 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/mod_devicetable.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_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
|
|
[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 = assert ? signal->bit : 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);
|