reset: npcm: add NPCM reset controller driver
Add Nuvoton NPCM BMC reset controller driver. Signed-off-by: Tomer Maimon <tmaimon77@gmail.com> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Tomer Maimon
Philipp Zabel
parent
a5df0d4e9d
commit
9c81b2ccf8
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@ -89,6 +89,13 @@ config RESET_MESON_AUDIO_ARB
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This enables the reset driver for Audio Memory Arbiter of
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Amlogic's A113 based SoCs
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config RESET_NPCM
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bool "NPCM BMC Reset Driver" if COMPILE_TEST
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default ARCH_NPCM
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help
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This enables the reset controller driver for Nuvoton NPCM
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BMC SoCs.
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config RESET_OXNAS
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bool
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@ -14,6 +14,7 @@ obj-$(CONFIG_RESET_LANTIQ) += reset-lantiq.o
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obj-$(CONFIG_RESET_LPC18XX) += reset-lpc18xx.o
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obj-$(CONFIG_RESET_MESON) += reset-meson.o
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obj-$(CONFIG_RESET_MESON_AUDIO_ARB) += reset-meson-audio-arb.o
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obj-$(CONFIG_RESET_NPCM) += reset-npcm.o
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obj-$(CONFIG_RESET_OXNAS) += reset-oxnas.o
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obj-$(CONFIG_RESET_PISTACHIO) += reset-pistachio.o
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obj-$(CONFIG_RESET_QCOM_AOSS) += reset-qcom-aoss.o
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@ -0,0 +1,291 @@
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Nuvoton Technology corporation.
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/init.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/reboot.h>
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#include <linux/reset-controller.h>
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#include <linux/spinlock.h>
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#include <linux/mfd/syscon.h>
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#include <linux/regmap.h>
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#include <linux/of_address.h>
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/* NPCM7xx GCR registers */
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#define NPCM_MDLR_OFFSET 0x7C
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#define NPCM_MDLR_USBD0 BIT(9)
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#define NPCM_MDLR_USBD1 BIT(8)
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#define NPCM_MDLR_USBD2_4 BIT(21)
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#define NPCM_MDLR_USBD5_9 BIT(22)
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#define NPCM_USB1PHYCTL_OFFSET 0x140
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#define NPCM_USB2PHYCTL_OFFSET 0x144
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#define NPCM_USBXPHYCTL_RS BIT(28)
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/* NPCM7xx Reset registers */
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#define NPCM_SWRSTR 0x14
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#define NPCM_SWRST BIT(2)
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#define NPCM_IPSRST1 0x20
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#define NPCM_IPSRST1_USBD1 BIT(5)
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#define NPCM_IPSRST1_USBD2 BIT(8)
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#define NPCM_IPSRST1_USBD3 BIT(25)
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#define NPCM_IPSRST1_USBD4 BIT(22)
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#define NPCM_IPSRST1_USBD5 BIT(23)
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#define NPCM_IPSRST1_USBD6 BIT(24)
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#define NPCM_IPSRST2 0x24
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#define NPCM_IPSRST2_USB_HOST BIT(26)
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#define NPCM_IPSRST3 0x34
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#define NPCM_IPSRST3_USBD0 BIT(4)
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#define NPCM_IPSRST3_USBD7 BIT(5)
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#define NPCM_IPSRST3_USBD8 BIT(6)
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#define NPCM_IPSRST3_USBD9 BIT(7)
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#define NPCM_IPSRST3_USBPHY1 BIT(24)
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#define NPCM_IPSRST3_USBPHY2 BIT(25)
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#define NPCM_RC_RESETS_PER_REG 32
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#define NPCM_MASK_RESETS GENMASK(4, 0)
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struct npcm_rc_data {
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struct reset_controller_dev rcdev;
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struct notifier_block restart_nb;
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u32 sw_reset_number;
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void __iomem *base;
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spinlock_t lock;
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};
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#define to_rc_data(p) container_of(p, struct npcm_rc_data, rcdev)
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static int npcm_rc_restart(struct notifier_block *nb, unsigned long mode,
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void *cmd)
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{
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struct npcm_rc_data *rc = container_of(nb, struct npcm_rc_data,
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restart_nb);
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writel(NPCM_SWRST << rc->sw_reset_number, rc->base + NPCM_SWRSTR);
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mdelay(1000);
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pr_emerg("%s: unable to restart system\n", __func__);
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return NOTIFY_DONE;
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}
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static int npcm_rc_setclear_reset(struct reset_controller_dev *rcdev,
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unsigned long id, bool set)
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{
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struct npcm_rc_data *rc = to_rc_data(rcdev);
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unsigned int rst_bit = BIT(id & NPCM_MASK_RESETS);
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unsigned int ctrl_offset = id >> 8;
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unsigned long flags;
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u32 stat;
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spin_lock_irqsave(&rc->lock, flags);
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stat = readl(rc->base + ctrl_offset);
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if (set)
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writel(stat | rst_bit, rc->base + ctrl_offset);
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else
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writel(stat & ~rst_bit, rc->base + ctrl_offset);
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spin_unlock_irqrestore(&rc->lock, flags);
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return 0;
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}
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static int npcm_rc_assert(struct reset_controller_dev *rcdev, unsigned long id)
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{
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return npcm_rc_setclear_reset(rcdev, id, true);
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}
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static int npcm_rc_deassert(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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return npcm_rc_setclear_reset(rcdev, id, false);
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}
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static int npcm_rc_status(struct reset_controller_dev *rcdev,
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unsigned long id)
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{
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struct npcm_rc_data *rc = to_rc_data(rcdev);
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unsigned int rst_bit = BIT(id & NPCM_MASK_RESETS);
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unsigned int ctrl_offset = id >> 8;
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return (readl(rc->base + ctrl_offset) & rst_bit);
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}
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static int npcm_reset_xlate(struct reset_controller_dev *rcdev,
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const struct of_phandle_args *reset_spec)
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{
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unsigned int offset, bit;
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offset = reset_spec->args[0];
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if (offset != NPCM_IPSRST1 && offset != NPCM_IPSRST2 &&
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offset != NPCM_IPSRST3) {
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dev_err(rcdev->dev, "Error reset register (0x%x)\n", offset);
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return -EINVAL;
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}
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bit = reset_spec->args[1];
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if (bit >= NPCM_RC_RESETS_PER_REG) {
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dev_err(rcdev->dev, "Error reset number (%d)\n", bit);
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return -EINVAL;
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}
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return (offset << 8) | bit;
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}
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static const struct of_device_id npcm_rc_match[] = {
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{ .compatible = "nuvoton,npcm750-reset",
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.data = (void *)"nuvoton,npcm750-gcr" },
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{ }
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};
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/*
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* The following procedure should be observed in USB PHY, USB device and
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* USB host initialization at BMC boot
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*/
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static int npcm_usb_reset(struct platform_device *pdev, struct npcm_rc_data *rc)
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{
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u32 mdlr, iprst1, iprst2, iprst3;
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struct device *dev = &pdev->dev;
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struct regmap *gcr_regmap;
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u32 ipsrst1_bits = 0;
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u32 ipsrst2_bits = NPCM_IPSRST2_USB_HOST;
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u32 ipsrst3_bits = 0;
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const char *gcr_dt;
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gcr_dt = (const char *)
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of_match_device(dev->driver->of_match_table, dev)->data;
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gcr_regmap = syscon_regmap_lookup_by_compatible(gcr_dt);
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if (IS_ERR(gcr_regmap)) {
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dev_err(&pdev->dev, "Failed to find %s\n", gcr_dt);
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return PTR_ERR(gcr_regmap);
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}
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/* checking which USB device is enabled */
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regmap_read(gcr_regmap, NPCM_MDLR_OFFSET, &mdlr);
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if (!(mdlr & NPCM_MDLR_USBD0))
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ipsrst3_bits |= NPCM_IPSRST3_USBD0;
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if (!(mdlr & NPCM_MDLR_USBD1))
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ipsrst1_bits |= NPCM_IPSRST1_USBD1;
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if (!(mdlr & NPCM_MDLR_USBD2_4))
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ipsrst1_bits |= (NPCM_IPSRST1_USBD2 |
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NPCM_IPSRST1_USBD3 |
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NPCM_IPSRST1_USBD4);
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if (!(mdlr & NPCM_MDLR_USBD0)) {
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ipsrst1_bits |= (NPCM_IPSRST1_USBD5 |
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NPCM_IPSRST1_USBD6);
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ipsrst3_bits |= (NPCM_IPSRST3_USBD7 |
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NPCM_IPSRST3_USBD8 |
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NPCM_IPSRST3_USBD9);
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}
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/* assert reset USB PHY and USB devices */
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iprst1 = readl(rc->base + NPCM_IPSRST1);
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iprst2 = readl(rc->base + NPCM_IPSRST2);
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iprst3 = readl(rc->base + NPCM_IPSRST3);
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iprst1 |= ipsrst1_bits;
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iprst2 |= ipsrst2_bits;
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iprst3 |= (ipsrst3_bits | NPCM_IPSRST3_USBPHY1 |
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NPCM_IPSRST3_USBPHY2);
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writel(iprst1, rc->base + NPCM_IPSRST1);
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writel(iprst2, rc->base + NPCM_IPSRST2);
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writel(iprst3, rc->base + NPCM_IPSRST3);
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/* clear USB PHY RS bit */
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regmap_update_bits(gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
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NPCM_USBXPHYCTL_RS, 0);
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regmap_update_bits(gcr_regmap, NPCM_USB2PHYCTL_OFFSET,
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NPCM_USBXPHYCTL_RS, 0);
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/* deassert reset USB PHY */
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iprst3 &= ~(NPCM_IPSRST3_USBPHY1 | NPCM_IPSRST3_USBPHY2);
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writel(iprst3, rc->base + NPCM_IPSRST3);
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udelay(50);
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/* set USB PHY RS bit */
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regmap_update_bits(gcr_regmap, NPCM_USB1PHYCTL_OFFSET,
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NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
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regmap_update_bits(gcr_regmap, NPCM_USB2PHYCTL_OFFSET,
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NPCM_USBXPHYCTL_RS, NPCM_USBXPHYCTL_RS);
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/* deassert reset USB devices*/
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iprst1 &= ~ipsrst1_bits;
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iprst2 &= ~ipsrst2_bits;
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iprst3 &= ~ipsrst3_bits;
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writel(iprst1, rc->base + NPCM_IPSRST1);
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writel(iprst2, rc->base + NPCM_IPSRST2);
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writel(iprst3, rc->base + NPCM_IPSRST3);
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return 0;
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}
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static const struct reset_control_ops npcm_rc_ops = {
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.assert = npcm_rc_assert,
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.deassert = npcm_rc_deassert,
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.status = npcm_rc_status,
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};
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static int npcm_rc_probe(struct platform_device *pdev)
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{
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struct npcm_rc_data *rc;
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int ret;
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rc = devm_kzalloc(&pdev->dev, sizeof(*rc), GFP_KERNEL);
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if (!rc)
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return -ENOMEM;
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rc->base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(rc->base))
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return PTR_ERR(rc->base);
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spin_lock_init(&rc->lock);
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rc->rcdev.owner = THIS_MODULE;
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rc->rcdev.ops = &npcm_rc_ops;
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rc->rcdev.of_node = pdev->dev.of_node;
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rc->rcdev.of_reset_n_cells = 2;
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rc->rcdev.of_xlate = npcm_reset_xlate;
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platform_set_drvdata(pdev, rc);
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ret = devm_reset_controller_register(&pdev->dev, &rc->rcdev);
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if (ret) {
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dev_err(&pdev->dev, "unable to register device\n");
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return ret;
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}
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if (npcm_usb_reset(pdev, rc))
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dev_warn(&pdev->dev, "NPCM USB reset failed, can cause issues with UDC and USB host\n");
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if (!of_property_read_u32(pdev->dev.of_node, "nuvoton,sw-reset-number",
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&rc->sw_reset_number)) {
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if (rc->sw_reset_number && rc->sw_reset_number < 5) {
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rc->restart_nb.priority = 192,
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rc->restart_nb.notifier_call = npcm_rc_restart,
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ret = register_restart_handler(&rc->restart_nb);
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if (ret)
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dev_warn(&pdev->dev, "failed to register restart handler\n");
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}
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}
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return ret;
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}
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static struct platform_driver npcm_rc_driver = {
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.probe = npcm_rc_probe,
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.driver = {
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.name = "npcm-reset",
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.of_match_table = npcm_rc_match,
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.suppress_bind_attrs = true,
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},
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};
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builtin_platform_driver(npcm_rc_driver);
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