ipmi: add an NPCM7xx KCS BMC driver
This driver exposes the Keyboard Controller Style (KCS) interface on Novoton NPCM7xx SoCs as a character device. Such SOCs are commonly used as a BaseBoard Management Controller (BMC) on a server board, and KCS interface is commonly used to perform the in-band IPMI communication between the server and its BMC. Signed-off-by: Avi Fishman <avifishman70@gmail.com> Signed-off-by: Haiyue Wang <haiyue.wang@linux.intel.com> Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Haiyue Wang
Corey Minyard
parent
93c303d204
commit
6b2e54f7ba
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@ -0,0 +1,39 @@
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* Nuvoton NPCM7xx KCS (Keyboard Controller Style) IPMI interface
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The Nuvoton SOCs (NPCM7xx) are commonly used as BMCs
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(Baseboard Management Controllers) and the KCS interface can be
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used to perform in-band IPMI communication with their host.
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Required properties:
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- compatible : should be one of
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"nuvoton,npcm750-kcs-bmc"
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- interrupts : interrupt generated by the controller
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- kcs_chan : The KCS channel number in the controller
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Example:
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lpc_kcs: lpc_kcs@f0007000 {
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compatible = "nuvoton,npcm750-lpc-kcs", "simple-mfd", "syscon";
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reg = <0xf0007000 0x40>;
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reg-io-width = <1>;
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#address-cells = <1>;
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#size-cells = <1>;
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ranges = <0x0 0xf0007000 0x40>;
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kcs1: kcs1@0 {
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compatible = "nuvoton,npcm750-kcs-bmc";
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reg = <0x0 0x40>;
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interrupts = <0 9 4>;
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kcs_chan = <1>;
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status = "disabled";
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};
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kcs2: kcs2@0 {
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compatible = "nuvoton,npcm750-kcs-bmc";
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reg = <0x0 0x40>;
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interrupts = <0 9 4>;
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kcs_chan = <2>;
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status = "disabled";
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};
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};
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@ -111,6 +111,21 @@ config ASPEED_KCS_IPMI_BMC
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The driver implements the BMC side of the KCS contorller, it
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provides the access of KCS IO space for BMC side.
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config NPCM7XX_KCS_IPMI_BMC
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depends on ARCH_NPCM7XX || COMPILE_TEST
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select IPMI_KCS_BMC
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select REGMAP_MMIO
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tristate "NPCM7xx KCS IPMI BMC driver"
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help
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Provides a driver for the KCS (Keyboard Controller Style) IPMI
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interface found on Nuvoton NPCM7xx SOCs.
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The driver implements the BMC side of the KCS contorller, it
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provides the access of KCS IO space for BMC side.
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This support is also available as a module. If so, the module
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will be called kcs_bmc_npcm7xx.
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config ASPEED_BT_IPMI_BMC
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depends on ARCH_ASPEED || COMPILE_TEST
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depends on REGMAP && REGMAP_MMIO && MFD_SYSCON
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@ -24,3 +24,4 @@ obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o
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obj-$(CONFIG_IPMI_KCS_BMC) += kcs_bmc.o
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obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o
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obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs_bmc_aspeed.o
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obj-$(CONFIG_NPCM7XX_KCS_IPMI_BMC) += kcs_bmc_npcm7xx.o
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@ -0,0 +1,204 @@
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// 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.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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/*
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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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*/
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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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};
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struct npcm7xx_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 },
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{ .sts = KCS2ST, .dob = KCS2DO, .dib = KCS2DI, .ctl = KCS2CTL },
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{ .sts = KCS3ST, .dob = KCS3DO, .dib = KCS3DI, .ctl = KCS3CTL },
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};
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static u8 npcm7xx_kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg)
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{
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struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(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 *kcs_bmc, u32 reg, u8 data)
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{
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struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(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_enable_channel(struct kcs_bmc *kcs_bmc, bool enable)
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{
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struct npcm7xx_kcs_bmc *priv = kcs_bmc_priv(kcs_bmc);
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regmap_update_bits(priv->map, priv->reg->ctl, KCS_CTL_IBFIE,
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enable ? KCS_CTL_IBFIE : 0);
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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 *kcs_bmc = arg;
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if (!kcs_bmc_handle_event(kcs_bmc))
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return IRQ_HANDLED;
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return IRQ_NONE;
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}
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static int npcm7xx_kcs_config_irq(struct kcs_bmc *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 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 *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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kcs_bmc = kcs_bmc_alloc(dev, sizeof(*priv), chan);
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if (!kcs_bmc)
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return -ENOMEM;
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priv = kcs_bmc_priv(kcs_bmc);
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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->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->io_inputb = npcm7xx_kcs_inb;
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kcs_bmc->io_outputb = npcm7xx_kcs_outb;
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dev_set_drvdata(dev, kcs_bmc);
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npcm7xx_kcs_enable_channel(kcs_bmc, true);
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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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rc = misc_register(&kcs_bmc->miscdev);
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if (rc) {
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dev_err(dev, "Unable to register device\n");
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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 kcs_bmc *kcs_bmc = dev_get_drvdata(&pdev->dev);
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misc_deregister(&kcs_bmc->miscdev);
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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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