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linux/drivers/reset/reset-npcm.c
Tomer Maimon ae358d71d4 reset: npcm: fix iprst2 and iprst4 setting 
In NPCM8XX USB reset sequence, iprst2 register was set with iprst4 value
and iprst4 register wasn´t set.

This fix sets the correct IP reset values in iprst2 and iprst4 registers
in NPCM8XX USB reset sequence.

Fixes: fc5d2a2f4a ("reset: npcm: Add NPCM8XX support")

Signed-off-by: Tomer Maimon <tmaimon77@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Link: https://lore.kernel.org/r/20220922153856.23326-1-tmaimon77@gmail.com
2022-09-22 17:48:35 +02:00

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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 NPCM7XX_MDLR_USBD0 BIT(9)
#define NPCM7XX_MDLR_USBD1 BIT(8)
#define NPCM7XX_MDLR_USBD2_4 BIT(21)
#define NPCM7XX_MDLR_USBD5_9 BIT(22)
/* NPCM8xx MDLR bits */
#define NPCM8XX_MDLR_USBD0_3 BIT(9)
#define NPCM8XX_MDLR_USBD4_7 BIT(22)
#define NPCM8XX_MDLR_USBD8 BIT(24)
#define NPCM8XX_MDLR_USBD9 BIT(21)
#define NPCM_USB1PHYCTL_OFFSET 0x140
#define NPCM_USB2PHYCTL_OFFSET 0x144
#define NPCM_USB3PHYCTL_OFFSET 0x148
#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_IPSRST4 0x74
#define NPCM_IPSRST4_USBPHY3 BIT(25)
#define NPCM_IPSRST4_USB_HOST2 BIT(31)
#define NPCM_RC_RESETS_PER_REG 32
#define NPCM_MASK_RESETS GENMASK(4, 0)
enum {
BMC_NPCM7XX = 0,
BMC_NPCM8XX,
};
static const u32 npxm7xx_ipsrst[] = {NPCM_IPSRST1, NPCM_IPSRST2, NPCM_IPSRST3};
static const u32 npxm8xx_ipsrst[] = {NPCM_IPSRST1, NPCM_IPSRST2, NPCM_IPSRST3,
NPCM_IPSRST4};
struct npcm_reset_info {
u32 bmc_id;
u32 num_ipsrst;
const u32 *ipsrst;
};
static const struct npcm_reset_info npxm7xx_reset_info[] = {
{.bmc_id = BMC_NPCM7XX, .num_ipsrst = 3, .ipsrst = npxm7xx_ipsrst}};
static const struct npcm_reset_info npxm8xx_reset_info[] = {
{.bmc_id = BMC_NPCM8XX, .num_ipsrst = 4, .ipsrst = npxm8xx_ipsrst}};
struct npcm_rc_data {
struct reset_controller_dev rcdev;
struct notifier_block restart_nb;
const struct npcm_reset_info *info;
struct regmap *gcr_regmap;
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)
{
struct npcm_rc_data *rc = to_rc_data(rcdev);
unsigned int offset, bit;
bool offset_found = false;
int off_num;
offset = reset_spec->args[0];
for (off_num = 0 ; off_num < rc->info->num_ipsrst ; off_num++) {
if (offset == rc->info->ipsrst[off_num]) {
offset_found = true;
break;
}
}
if (!offset_found) {
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 = &npxm7xx_reset_info},
{ .compatible = "nuvoton,npcm845-reset", .data = &npxm8xx_reset_info},
{ }
};
static void npcm_usb_reset_npcm7xx(struct npcm_rc_data *rc)
{
u32 mdlr, iprst1, iprst2, iprst3;
u32 ipsrst1_bits = 0;
u32 ipsrst2_bits = NPCM_IPSRST2_USB_HOST;
u32 ipsrst3_bits = 0;
/* checking which USB device is enabled */
regmap_read(rc->gcr_regmap, NPCM_MDLR_OFFSET, &mdlr);
if (!(mdlr & NPCM7XX_MDLR_USBD0))
ipsrst3_bits |= NPCM_IPSRST3_USBD0;
if (!(mdlr & NPCM7XX_MDLR_USBD1))
ipsrst1_bits |= NPCM_IPSRST1_USBD1;
if (!(mdlr & NPCM7XX_MDLR_USBD2_4))
ipsrst1_bits |= (NPCM_IPSRST1_USBD2 |
NPCM_IPSRST1_USBD3 |
NPCM_IPSRST1_USBD4);
if (!(mdlr & NPCM7XX_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(rc->gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, 0);
regmap_update_bits(rc->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(rc->gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
regmap_update_bits(rc->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);
}
static void npcm_usb_reset_npcm8xx(struct npcm_rc_data *rc)
{
u32 mdlr, iprst1, iprst2, iprst3, iprst4;
u32 ipsrst1_bits = 0;
u32 ipsrst2_bits = NPCM_IPSRST2_USB_HOST;
u32 ipsrst3_bits = 0;
u32 ipsrst4_bits = NPCM_IPSRST4_USB_HOST2 | NPCM_IPSRST4_USBPHY3;
/* checking which USB device is enabled */
regmap_read(rc->gcr_regmap, NPCM_MDLR_OFFSET, &mdlr);
if (!(mdlr & NPCM8XX_MDLR_USBD0_3)) {
ipsrst3_bits |= NPCM_IPSRST3_USBD0;
ipsrst1_bits |= (NPCM_IPSRST1_USBD1 |
NPCM_IPSRST1_USBD2 |
NPCM_IPSRST1_USBD3);
}
if (!(mdlr & NPCM8XX_MDLR_USBD4_7)) {
ipsrst1_bits |= (NPCM_IPSRST1_USBD4 |
NPCM_IPSRST1_USBD5 |
NPCM_IPSRST1_USBD6);
ipsrst3_bits |= NPCM_IPSRST3_USBD7;
}
if (!(mdlr & NPCM8XX_MDLR_USBD8))
ipsrst3_bits |= NPCM_IPSRST3_USBD8;
if (!(mdlr & NPCM8XX_MDLR_USBD9))
ipsrst3_bits |= 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);
iprst4 = readl(rc->base + NPCM_IPSRST4);
iprst1 |= ipsrst1_bits;
iprst2 |= ipsrst2_bits;
iprst3 |= (ipsrst3_bits | NPCM_IPSRST3_USBPHY1 |
NPCM_IPSRST3_USBPHY2);
iprst4 |= ipsrst4_bits;
writel(iprst1, rc->base + NPCM_IPSRST1);
writel(iprst2, rc->base + NPCM_IPSRST2);
writel(iprst3, rc->base + NPCM_IPSRST3);
writel(iprst4, rc->base + NPCM_IPSRST4);
/* clear USB PHY RS bit */
regmap_update_bits(rc->gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, 0);
regmap_update_bits(rc->gcr_regmap, NPCM_USB2PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, 0);
regmap_update_bits(rc->gcr_regmap, NPCM_USB3PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, 0);
/* deassert reset USB PHY */
iprst3 &= ~(NPCM_IPSRST3_USBPHY1 | NPCM_IPSRST3_USBPHY2);
writel(iprst3, rc->base + NPCM_IPSRST3);
iprst4 &= ~NPCM_IPSRST4_USBPHY3;
writel(iprst4, rc->base + NPCM_IPSRST4);
/* set USB PHY RS bit */
regmap_update_bits(rc->gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
regmap_update_bits(rc->gcr_regmap, NPCM_USB2PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
regmap_update_bits(rc->gcr_regmap, NPCM_USB3PHYCTL_OFFSET,
NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
/* deassert reset USB devices*/
iprst1 &= ~ipsrst1_bits;
iprst2 &= ~ipsrst2_bits;
iprst3 &= ~ipsrst3_bits;
iprst4 &= ~ipsrst4_bits;
writel(iprst1, rc->base + NPCM_IPSRST1);
writel(iprst2, rc->base + NPCM_IPSRST2);
writel(iprst3, rc->base + NPCM_IPSRST3);
writel(iprst4, rc->base + NPCM_IPSRST4);
}
/*
* 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)
{
struct device *dev = &pdev->dev;
rc->gcr_regmap = syscon_regmap_lookup_by_phandle(dev->of_node, "nuvoton,sysgcr");
if (IS_ERR(rc->gcr_regmap)) {
dev_warn(&pdev->dev, "Failed to find nuvoton,sysgcr property, please update the device tree\n");
dev_info(&pdev->dev, "Using nuvoton,npcm750-gcr for Poleg backward compatibility\n");
rc->gcr_regmap = syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
if (IS_ERR(rc->gcr_regmap)) {
dev_err(&pdev->dev, "Failed to find nuvoton,npcm750-gcr");
return PTR_ERR(rc->gcr_regmap);
}
}
rc->info = (const struct npcm_reset_info *)
of_match_device(dev->driver->of_match_table, dev)->data;
switch (rc->info->bmc_id) {
case BMC_NPCM7XX:
npcm_usb_reset_npcm7xx(rc);
break;
case BMC_NPCM8XX:
npcm_usb_reset_npcm8xx(rc);
break;
default:
return -ENODEV;
}
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);
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