linux/drivers/reset/reset-npcm.c

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// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2019 Nuvoton Technology corporation.
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/reset-controller.h>
#include <linux/spinlock.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/of_address.h>
/* NPCM7xx GCR registers */
#define NPCM_MDLR_OFFSET 0x7C
#define NPCM_MDLR_USBD0 BIT(9)
#define NPCM_MDLR_USBD1 BIT(8)
#define NPCM_MDLR_USBD2_4 BIT(21)
#define NPCM_MDLR_USBD5_9 BIT(22)
#define NPCM_USB1PHYCTL_OFFSET 0x140
#define NPCM_USB2PHYCTL_OFFSET 0x144
#define NPCM_USBXPHYCTL_RS BIT(28)
/* NPCM7xx Reset registers */
#define NPCM_SWRSTR 0x14
#define NPCM_SWRST BIT(2)
#define NPCM_IPSRST1 0x20
#define NPCM_IPSRST1_USBD1 BIT(5)
#define NPCM_IPSRST1_USBD2 BIT(8)
#define NPCM_IPSRST1_USBD3 BIT(25)
#define NPCM_IPSRST1_USBD4 BIT(22)
#define NPCM_IPSRST1_USBD5 BIT(23)
#define NPCM_IPSRST1_USBD6 BIT(24)
#define NPCM_IPSRST2 0x24
#define NPCM_IPSRST2_USB_HOST BIT(26)
#define NPCM_IPSRST3 0x34
#define NPCM_IPSRST3_USBD0 BIT(4)
#define NPCM_IPSRST3_USBD7 BIT(5)
#define NPCM_IPSRST3_USBD8 BIT(6)
#define NPCM_IPSRST3_USBD9 BIT(7)
#define NPCM_IPSRST3_USBPHY1 BIT(24)
#define NPCM_IPSRST3_USBPHY2 BIT(25)
#define NPCM_RC_RESETS_PER_REG 32
#define NPCM_MASK_RESETS GENMASK(4, 0)
struct npcm_rc_data {
struct reset_controller_dev rcdev;
struct notifier_block restart_nb;
u32 sw_reset_number;
void __iomem *base;
spinlock_t lock;
};
#define to_rc_data(p) container_of(p, struct npcm_rc_data, rcdev)
static int npcm_rc_restart(struct notifier_block *nb, unsigned long mode,
void *cmd)
{
struct npcm_rc_data *rc = container_of(nb, struct npcm_rc_data,
restart_nb);
writel(NPCM_SWRST << rc->sw_reset_number, rc->base + NPCM_SWRSTR);
mdelay(1000);
pr_emerg("%s: unable to restart system\n", __func__);
return NOTIFY_DONE;
}
static int npcm_rc_setclear_reset(struct reset_controller_dev *rcdev,
unsigned long id, bool set)
{
struct npcm_rc_data *rc = to_rc_data(rcdev);
unsigned int rst_bit = BIT(id & NPCM_MASK_RESETS);
unsigned int ctrl_offset = id >> 8;
unsigned long flags;
u32 stat;
spin_lock_irqsave(&rc->lock, flags);
stat = readl(rc->base + ctrl_offset);
if (set)
writel(stat | rst_bit, rc->base + ctrl_offset);
else
writel(stat & ~rst_bit, rc->base + ctrl_offset);
spin_unlock_irqrestore(&rc->lock, flags);
return 0;
}
static int npcm_rc_assert(struct reset_controller_dev *rcdev, unsigned long id)
{
return npcm_rc_setclear_reset(rcdev, id, true);
}
static int npcm_rc_deassert(struct reset_controller_dev *rcdev,
unsigned long id)
{
return npcm_rc_setclear_reset(rcdev, id, false);
}
static int npcm_rc_status(struct reset_controller_dev *rcdev,
unsigned long id)
{
struct npcm_rc_data *rc = to_rc_data(rcdev);
unsigned int rst_bit = BIT(id & NPCM_MASK_RESETS);
unsigned int ctrl_offset = id >> 8;
return (readl(rc->base + ctrl_offset) & rst_bit);
}
static int npcm_reset_xlate(struct reset_controller_dev *rcdev,
const struct of_phandle_args *reset_spec)
{
unsigned int offset, bit;
offset = reset_spec->args[0];
if (offset != NPCM_IPSRST1 && offset != NPCM_IPSRST2 &&
offset != NPCM_IPSRST3) {
dev_err(rcdev->dev, "Error reset register (0x%x)\n", offset);
return -EINVAL;
}
bit = reset_spec->args[1];
if (bit >= NPCM_RC_RESETS_PER_REG) {
dev_err(rcdev->dev, "Error reset number (%d)\n", bit);
return -EINVAL;
}
return (offset << 8) | bit;
}
static const struct of_device_id npcm_rc_match[] = {
{ .compatible = "nuvoton,npcm750-reset",
.data = (void *)"nuvoton,npcm750-gcr" },
{ }
};
/*
* The following procedure should be observed in USB PHY, USB device and
* USB host initialization at BMC boot
*/
static int npcm_usb_reset(struct platform_device *pdev, struct npcm_rc_data *rc)
{
u32 mdlr, iprst1, iprst2, iprst3;
struct device *dev = &pdev->dev;
struct regmap *gcr_regmap;
u32 ipsrst1_bits = 0;
u32 ipsrst2_bits = NPCM_IPSRST2_USB_HOST;
u32 ipsrst3_bits = 0;
const char *gcr_dt;
gcr_dt = (const char *)
of_match_device(dev->driver->of_match_table, dev)->data;
gcr_regmap = syscon_regmap_lookup_by_compatible(gcr_dt);
if (IS_ERR(gcr_regmap)) {
dev_err(&pdev->dev, "Failed to find %s\n", gcr_dt);
return PTR_ERR(gcr_regmap);
}
/* checking which USB device is enabled */
regmap_read(gcr_regmap, NPCM_MDLR_OFFSET, &mdlr);
if (!(mdlr & NPCM_MDLR_USBD0))
ipsrst3_bits |= NPCM_IPSRST3_USBD0;
if (!(mdlr & NPCM_MDLR_USBD1))
ipsrst1_bits |= NPCM_IPSRST1_USBD1;
if (!(mdlr & NPCM_MDLR_USBD2_4))
ipsrst1_bits |= (NPCM_IPSRST1_USBD2 |
NPCM_IPSRST1_USBD3 |
NPCM_IPSRST1_USBD4);
if (!(mdlr & NPCM_MDLR_USBD0)) {
ipsrst1_bits |= (NPCM_IPSRST1_USBD5 |
NPCM_IPSRST1_USBD6);
ipsrst3_bits |= (NPCM_IPSRST3_USBD7 |
NPCM_IPSRST3_USBD8 |
NPCM_IPSRST3_USBD9);
}
/* assert reset USB PHY and USB devices */
iprst1 = readl(rc->base + NPCM_IPSRST1);
iprst2 = readl(rc->base + NPCM_IPSRST2);
iprst3 = readl(rc->base + NPCM_IPSRST3);
iprst1 |= ipsrst1_bits;
iprst2 |= ipsrst2_bits;
iprst3 |= (ipsrst3_bits | NPCM_IPSRST3_USBPHY1 |
NPCM_IPSRST3_USBPHY2);
writel(iprst1, rc->base + NPCM_IPSRST1);
writel(iprst2, rc->base + NPCM_IPSRST2);
writel(iprst3, rc->base + NPCM_IPSRST3);
/* clear USB PHY RS bit */
regmap_update_bits(gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, 0);
regmap_update_bits(gcr_regmap, NPCM_USB2PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, 0);
/* deassert reset USB PHY */
iprst3 &= ~(NPCM_IPSRST3_USBPHY1 | NPCM_IPSRST3_USBPHY2);
writel(iprst3, rc->base + NPCM_IPSRST3);
udelay(50);
/* set USB PHY RS bit */
regmap_update_bits(gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
regmap_update_bits(gcr_regmap, NPCM_USB2PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
/* deassert reset USB devices*/
iprst1 &= ~ipsrst1_bits;
iprst2 &= ~ipsrst2_bits;
iprst3 &= ~ipsrst3_bits;
writel(iprst1, rc->base + NPCM_IPSRST1);
writel(iprst2, rc->base + NPCM_IPSRST2);
writel(iprst3, rc->base + NPCM_IPSRST3);
return 0;
}
static const struct reset_control_ops npcm_rc_ops = {
.assert = npcm_rc_assert,
.deassert = npcm_rc_deassert,
.status = npcm_rc_status,
};
static int npcm_rc_probe(struct platform_device *pdev)
{
struct npcm_rc_data *rc;
int ret;
rc = devm_kzalloc(&pdev->dev, sizeof(*rc), GFP_KERNEL);
if (!rc)
return -ENOMEM;
rc->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(rc->base))
return PTR_ERR(rc->base);
spin_lock_init(&rc->lock);
rc->rcdev.owner = THIS_MODULE;
rc->rcdev.ops = &npcm_rc_ops;
rc->rcdev.of_node = pdev->dev.of_node;
rc->rcdev.of_reset_n_cells = 2;
rc->rcdev.of_xlate = npcm_reset_xlate;
platform_set_drvdata(pdev, rc);
ret = devm_reset_controller_register(&pdev->dev, &rc->rcdev);
if (ret) {
dev_err(&pdev->dev, "unable to register device\n");
return ret;
}
if (npcm_usb_reset(pdev, rc))
dev_warn(&pdev->dev, "NPCM USB reset failed, can cause issues with UDC and USB host\n");
if (!of_property_read_u32(pdev->dev.of_node, "nuvoton,sw-reset-number",
&rc->sw_reset_number)) {
if (rc->sw_reset_number && rc->sw_reset_number < 5) {
rc->restart_nb.priority = 192,
rc->restart_nb.notifier_call = npcm_rc_restart,
ret = register_restart_handler(&rc->restart_nb);
if (ret)
dev_warn(&pdev->dev, "failed to register restart handler\n");
}
}
return ret;
}
static struct platform_driver npcm_rc_driver = {
.probe = npcm_rc_probe,
.driver = {
.name = "npcm-reset",
.of_match_table = npcm_rc_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(npcm_rc_driver);