254 lines
6.5 KiB
C
254 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2018, Nuvoton Corporation.
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* Copyright (c) 2018, Intel Corporation.
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*/
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#define pr_fmt(fmt) "nuvoton-kcs-bmc: " fmt
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#include <linux/atomic.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/mfd/syscon.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include "kcs_bmc_device.h"
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#define DEVICE_NAME "npcm-kcs-bmc"
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#define KCS_CHANNEL_MAX 3
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#define KCS1ST 0x0C
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#define KCS2ST 0x1E
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#define KCS3ST 0x30
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#define KCS1DO 0x0E
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#define KCS2DO 0x20
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#define KCS3DO 0x32
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#define KCS1DI 0x10
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#define KCS2DI 0x22
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#define KCS3DI 0x34
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#define KCS1CTL 0x18
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#define KCS2CTL 0x2A
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#define KCS3CTL 0x3C
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#define KCS_CTL_IBFIE BIT(0)
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#define KCS_CTL_OBEIE BIT(1)
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#define KCS1IE 0x1C
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#define KCS2IE 0x2E
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#define KCS3IE 0x40
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#define KCS_IE_IRQE BIT(0)
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#define KCS_IE_HIRQE BIT(3)
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/*
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* 7.2.4 Core KCS Registers
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* Registers in this module are 8 bits. An 8-bit register must be accessed
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* by an 8-bit read or write.
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*
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* sts: KCS Channel n Status Register (KCSnST).
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* dob: KCS Channel n Data Out Buffer Register (KCSnDO).
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* dib: KCS Channel n Data In Buffer Register (KCSnDI).
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* ctl: KCS Channel n Control Register (KCSnCTL).
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* ie : KCS Channel n Interrupt Enable Register (KCSnIE).
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*/
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struct npcm7xx_kcs_reg {
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u32 sts;
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u32 dob;
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u32 dib;
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u32 ctl;
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u32 ie;
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};
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struct npcm7xx_kcs_bmc {
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struct kcs_bmc_device kcs_bmc;
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struct regmap *map;
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const struct npcm7xx_kcs_reg *reg;
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};
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static const struct npcm7xx_kcs_reg npcm7xx_kcs_reg_tbl[KCS_CHANNEL_MAX] = {
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{ .sts = KCS1ST, .dob = KCS1DO, .dib = KCS1DI, .ctl = KCS1CTL, .ie = KCS1IE },
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{ .sts = KCS2ST, .dob = KCS2DO, .dib = KCS2DI, .ctl = KCS2CTL, .ie = KCS2IE },
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{ .sts = KCS3ST, .dob = KCS3DO, .dib = KCS3DI, .ctl = KCS3CTL, .ie = KCS3IE },
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};
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static inline struct npcm7xx_kcs_bmc *to_npcm7xx_kcs_bmc(struct kcs_bmc_device *kcs_bmc)
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{
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return container_of(kcs_bmc, struct npcm7xx_kcs_bmc, kcs_bmc);
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}
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static u8 npcm7xx_kcs_inb(struct kcs_bmc_device *kcs_bmc, u32 reg)
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{
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struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
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u32 val = 0;
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int rc;
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rc = regmap_read(priv->map, reg, &val);
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WARN(rc != 0, "regmap_read() failed: %d\n", rc);
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return rc == 0 ? (u8)val : 0;
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}
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static void npcm7xx_kcs_outb(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 data)
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{
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struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
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int rc;
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rc = regmap_write(priv->map, reg, data);
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WARN(rc != 0, "regmap_write() failed: %d\n", rc);
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}
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static void npcm7xx_kcs_updateb(struct kcs_bmc_device *kcs_bmc, u32 reg, u8 mask, u8 data)
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{
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struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
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int rc;
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rc = regmap_update_bits(priv->map, reg, mask, data);
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WARN(rc != 0, "regmap_update_bits() failed: %d\n", rc);
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}
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static void npcm7xx_kcs_enable_channel(struct kcs_bmc_device *kcs_bmc, bool enable)
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{
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struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
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regmap_update_bits(priv->map, priv->reg->ie, KCS_IE_IRQE | KCS_IE_HIRQE,
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enable ? KCS_IE_IRQE | KCS_IE_HIRQE : 0);
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}
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static void npcm7xx_kcs_irq_mask_update(struct kcs_bmc_device *kcs_bmc, u8 mask, u8 state)
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{
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struct npcm7xx_kcs_bmc *priv = to_npcm7xx_kcs_bmc(kcs_bmc);
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if (mask & KCS_BMC_EVENT_TYPE_OBE)
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regmap_update_bits(priv->map, priv->reg->ctl, KCS_CTL_OBEIE,
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!!(state & KCS_BMC_EVENT_TYPE_OBE) * KCS_CTL_OBEIE);
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if (mask & KCS_BMC_EVENT_TYPE_IBF)
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regmap_update_bits(priv->map, priv->reg->ctl, KCS_CTL_IBFIE,
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!!(state & KCS_BMC_EVENT_TYPE_IBF) * KCS_CTL_IBFIE);
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}
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static irqreturn_t npcm7xx_kcs_irq(int irq, void *arg)
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{
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struct kcs_bmc_device *kcs_bmc = arg;
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return kcs_bmc_handle_event(kcs_bmc);
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}
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static int npcm7xx_kcs_config_irq(struct kcs_bmc_device *kcs_bmc,
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struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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int irq;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0)
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return irq;
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return devm_request_irq(dev, irq, npcm7xx_kcs_irq, IRQF_SHARED,
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dev_name(dev), kcs_bmc);
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}
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static const struct kcs_bmc_device_ops npcm7xx_kcs_ops = {
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.irq_mask_update = npcm7xx_kcs_irq_mask_update,
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.io_inputb = npcm7xx_kcs_inb,
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.io_outputb = npcm7xx_kcs_outb,
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.io_updateb = npcm7xx_kcs_updateb,
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};
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static int npcm7xx_kcs_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct npcm7xx_kcs_bmc *priv;
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struct kcs_bmc_device *kcs_bmc;
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u32 chan;
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int rc;
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rc = of_property_read_u32(dev->of_node, "kcs_chan", &chan);
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if (rc != 0 || chan == 0 || chan > KCS_CHANNEL_MAX) {
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dev_err(dev, "no valid 'kcs_chan' configured\n");
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return -ENODEV;
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}
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priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->map = syscon_node_to_regmap(dev->parent->of_node);
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if (IS_ERR(priv->map)) {
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dev_err(dev, "Couldn't get regmap\n");
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return -ENODEV;
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}
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priv->reg = &npcm7xx_kcs_reg_tbl[chan - 1];
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kcs_bmc = &priv->kcs_bmc;
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kcs_bmc->dev = &pdev->dev;
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kcs_bmc->channel = chan;
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kcs_bmc->ioreg.idr = priv->reg->dib;
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kcs_bmc->ioreg.odr = priv->reg->dob;
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kcs_bmc->ioreg.str = priv->reg->sts;
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kcs_bmc->ops = &npcm7xx_kcs_ops;
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platform_set_drvdata(pdev, priv);
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rc = npcm7xx_kcs_config_irq(kcs_bmc, pdev);
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if (rc)
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return rc;
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npcm7xx_kcs_irq_mask_update(kcs_bmc, (KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE), 0);
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npcm7xx_kcs_enable_channel(kcs_bmc, true);
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rc = kcs_bmc_add_device(kcs_bmc);
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if (rc) {
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dev_warn(&pdev->dev, "Failed to register channel %d: %d\n", kcs_bmc->channel, rc);
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return rc;
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}
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pr_info("channel=%u idr=0x%x odr=0x%x str=0x%x\n",
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chan,
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kcs_bmc->ioreg.idr, kcs_bmc->ioreg.odr, kcs_bmc->ioreg.str);
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return 0;
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}
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static int npcm7xx_kcs_remove(struct platform_device *pdev)
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{
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struct npcm7xx_kcs_bmc *priv = platform_get_drvdata(pdev);
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struct kcs_bmc_device *kcs_bmc = &priv->kcs_bmc;
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kcs_bmc_remove_device(kcs_bmc);
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npcm7xx_kcs_enable_channel(kcs_bmc, false);
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npcm7xx_kcs_irq_mask_update(kcs_bmc, (KCS_BMC_EVENT_TYPE_IBF | KCS_BMC_EVENT_TYPE_OBE), 0);
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return 0;
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}
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static const struct of_device_id npcm_kcs_bmc_match[] = {
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{ .compatible = "nuvoton,npcm750-kcs-bmc" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, npcm_kcs_bmc_match);
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static struct platform_driver npcm_kcs_bmc_driver = {
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.driver = {
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.name = DEVICE_NAME,
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.of_match_table = npcm_kcs_bmc_match,
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},
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.probe = npcm7xx_kcs_probe,
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.remove = npcm7xx_kcs_remove,
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};
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module_platform_driver(npcm_kcs_bmc_driver);
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MODULE_LICENSE("GPL v2");
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MODULE_AUTHOR("Avi Fishman <avifishman70@gmail.com>");
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MODULE_AUTHOR("Haiyue Wang <haiyue.wang@linux.intel.com>");
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MODULE_DESCRIPTION("NPCM7xx device interface to the KCS BMC device");
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