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Message-ID: <1759fb4f-0b7a-112e-fc13-d1f8e946bf7a@acm.org>
Date: Wed, 20 Dec 2017 19:12:29 -0600
From: Corey Minyard <minyard@....org>
To: "Wang, Haiyue" <haiyue.wang@...ux.intel.com>,
openipmi-developer@...ts.sourceforge.net,
linux-kernel@...r.kernel.org, clg@...d.org, jk@...abs.org,
joel@....id.au, andrew@...id.au
Subject: Re: [PATCH linux ipmi for BMC v2] ipmi: add an Aspeed KCS IPMI BMC
driver
On 12/20/2017 06:59 PM, Wang, Haiyue wrote:
>
>
> On 2017-12-21 04:11, Corey Minyard wrote:
>> On 12/14/2017 10:34 PM, Haiyue Wang wrote:
>>> This patch adds a simple device driver to expose the KCS interface on
>>> Aspeed SOCs (AST2400 and AST2500) as a character device. Such SOCs are
>>> commonly used as BMCs (BaseBoard Management Controllers) and this
>>> driver
>>> implements the BMC side of the KCS interface.
>>>
>>> The KCS (Keyboard Controller Style) interface is used to perform
>>> in-band
>>> IPMI communication between a host and its BMC.
>>>
>>> The device name defaults to '/dev/ipmi-kcsX', X=1,2,3,4.
>>
>> Looking through this, I have no objections. I didn't do an analysis
>> of the state machine. Have you tested it through the various error
>> states? You'd have to hack the IPMI driver on the host side to be
>> able to do that, but it's not too hard.
>>
> Not hack the IPMI driver, but work well with it in so many stress
> cycle test and long time running well.
That is probably not enough. Under normal conditions you will never see
an abort, you generally have to force it. That's a lot of code that is
essentially untested.
>
>> My only comment is that it might be nice to have consistent ioctl
>> numbers for the operations on a BMC (at least ATN would be common
>> between KCS and BT). But that's not a big deal.
>>
> In KCS, the ATN has the set/clear requirement, BT only has set
> requirement. Or you mean change '1' to ' _IOW(__KCS_BMC_IOCTL_MAGIC,
> 0, unsigned long)' as BT ?
>
I mean "discuss with the BT driver maintainers so that the BT and KCS
interfaces work essentially the same." From a user point of view, it
would be nice to not have to know if it's KCS or BT for the most part.
-corey
> #define __BT_BMC_IOCTL_MAGIC 0xb1
> #define BT_BMC_IOCTL_SMS_ATN _IO(__BT_BMC_IOCTL_MAGIC, 0x00)
>
> #define __KCS_BMC_IOCTL_MAGIC 'K'
> #define KCS_BMC_IOCTL_SMS_ATN _IOW(__KCS_BMC_IOCTL_MAGIC, 1,
> unsigned long)
> #define KCS_BMC_IOCTL_FORCE_ABORT _IO(__KCS_BMC_IOCTL_MAGIC, 2)
>> Anyone from the openbmc group want to comment on this?
>>
>> -corey
>>
>>> Signed-off-by: Haiyue Wang <haiyue.wang@...ux.intel.com>
>>> ---
>>> .../devicetree/bindings/mfd/aspeed-lpc.txt | 31 +-
>>> drivers/char/ipmi/Kconfig | 9 +
>>> drivers/char/ipmi/Makefile | 1 +
>>> drivers/char/ipmi/kcs-bmc.c | 759
>>> +++++++++++++++++++++
>>> include/uapi/linux/kcs-bmc.h | 13 +
>>> 5 files changed, 810 insertions(+), 3 deletions(-)
>>> create mode 100644 drivers/char/ipmi/kcs-bmc.c
>>> create mode 100644 include/uapi/linux/kcs-bmc.h
>>>
>>> diff --git a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
>>> b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
>>> index 514d82c..e682000 100644
>>> --- a/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
>>> +++ b/Documentation/devicetree/bindings/mfd/aspeed-lpc.txt
>>> @@ -62,12 +62,24 @@ BMC Node
>>> --------
>>> - compatible: One of:
>>> - "aspeed,ast2400-lpc-bmc"
>>> - "aspeed,ast2500-lpc-bmc"
>>> + "aspeed,ast2400-lpc-bmc", "simple-mfd", "syscon"
>>> + "aspeed,ast2500-lpc-bmc", "simple-mfd", "syscon"
>>> - reg: contains the physical address and length values of
>>> the
>>> H8S/2168-compatible LPC controller memory region
>>> +BMC KCS Node
>>> +------------
>>> +
>>> +- compatible: One of:
>>> + "aspeed,ast2400-kcs-bmc"
>>> + "aspeed,ast2500-kcs-bmc"
>>> +
>>> +- kcs_chan: The LPC channel number
>>> +
>>> +- kcs_addr: The host CPU IO map address
>>> +
>>> +
>>> Host Node
>>> ---------
>>> @@ -94,8 +106,21 @@ lpc: lpc@...89000 {
>>> ranges = <0x0 0x1e789000 0x1000>;
>>> lpc_bmc: lpc-bmc@0 {
>>> - compatible = "aspeed,ast2500-lpc-bmc";
>>> + compatible = "aspeed,ast2500-lpc-bmc", "simple-mfd", "syscon";
>>> reg = <0x0 0x80>;
>>> + reg-io-width = <4>;
>>> +
>>> + #address-cells = <1>;
>>> + #size-cells = <1>;
>>> + ranges = <0x0 0x0 0x80>;
>>> +
>>> + kcs3: kcs3@0 {
>>> + compatible = "aspeed,ast2500-kcs-bmc";
>>> + interrupts = <8>;
>>> + kcs_chan = <3>;
>>> + kcs_addr = <0xCA2>;
>>> + status = "okay";
>>> + };
>>> };
>>> lpc_host: lpc-host@80 {
>>> diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig
>>> index 3544abc..3a9d29b 100644
>>> --- a/drivers/char/ipmi/Kconfig
>>> +++ b/drivers/char/ipmi/Kconfig
>>> @@ -104,3 +104,12 @@ config ASPEED_BT_IPMI_BMC
>>> Provides a driver for the BT (Block Transfer) IPMI interface
>>> found on Aspeed SOCs (AST2400 and AST2500). The driver
>>> implements the BMC side of the BT interface.
>>> +
>>> +config ASPEED_KCS_IPMI_BMC
>>> + depends on ARCH_ASPEED || COMPILE_TEST
>>> + depends on REGMAP && REGMAP_MMIO && MFD_SYSCON
>>> + tristate "KCS IPMI bmc driver"
>>> + help
>>> + Provides a driver for the KCS (Keyboard Controller Style) IPMI
>>> + interface found on Aspeed SOCs (AST2400 and AST2500). The driver
>>> + implements the BMC side of the KCS interface.
>>> \ No newline at end of file
>>> diff --git a/drivers/char/ipmi/Makefile b/drivers/char/ipmi/Makefile
>>> index 33b899f..f217bae 100644
>>> --- a/drivers/char/ipmi/Makefile
>>> +++ b/drivers/char/ipmi/Makefile
>>> @@ -22,3 +22,4 @@ obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o
>>> obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o
>>> obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o
>>> obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o
>>> +obj-$(CONFIG_ASPEED_KCS_IPMI_BMC) += kcs-bmc.o
>>> \ No newline at end of file
>>> diff --git a/drivers/char/ipmi/kcs-bmc.c b/drivers/char/ipmi/kcs-bmc.c
>>> new file mode 100644
>>> index 0000000..256fb00
>>> --- /dev/null
>>> +++ b/drivers/char/ipmi/kcs-bmc.c
>>> @@ -0,0 +1,759 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +// Copyright (c) 2015-2017, Intel Corporation.
>>> +
>>> +#include <linux/atomic.h>
>>> +#include <linux/slab.h>
>>> +#include <linux/kcs-bmc.h>
>>> +#include <linux/errno.h>
>>> +#include <linux/interrupt.h>
>>> +#include <linux/io.h>
>>> +#include <linux/mfd/syscon.h>
>>> +#include <linux/miscdevice.h>
>>> +#include <linux/module.h>
>>> +#include <linux/of.h>
>>> +#include <linux/platform_device.h>
>>> +#include <linux/poll.h>
>>> +#include <linux/regmap.h>
>>> +#include <linux/sched.h>
>>> +#include <linux/timer.h>
>>> +
>>> +#define KCS_MSG_BUFSIZ 1024
>>> +#define KCS_CHANNEL_MAX 4
>>> +
>>> +/*
>>> + * This is a BMC device used to communicate to the host
>>> + */
>>> +#define DEVICE_NAME "ipmi-kcs-host"
>>> +
>>> +
>>> +/* Different Phases of the KCS Module */
>>> +#define KCS_PHASE_IDLE 0x00
>>> +#define KCS_PHASE_WRITE 0x01
>>> +#define KCS_PHASE_WRITE_END 0x02
>>> +#define KCS_PHASE_READ 0x03
>>> +#define KCS_PHASE_ABORT 0x04
>>> +#define KCS_PHASE_ERROR 0x05
>>> +
>>> +/* Abort Phase */
>>> +#define ABORT_PHASE_ERROR1 0x01
>>> +#define ABORT_PHASE_ERROR2 0x02
>>> +
>>> +/* KCS Command Control codes. */
>>> +#define KCS_GET_STATUS 0x60
>>> +#define KCS_ABORT 0x60
>>> +#define KCS_WRITE_START 0x61
>>> +#define KCS_WRITE_END 0x62
>>> +#define KCS_READ_BYTE 0x68
>>> +
>>> +/* Status bits.:
>>> + * - IDLE_STATE. Interface is idle. System software should not be
>>> expecting
>>> + * nor sending any data.
>>> + * - READ_STATE. BMC is transferring a packet to system software.
>>> System
>>> + * software should be in the "Read Message" state.
>>> + * - WRITE_STATE. BMC is receiving a packet from system software.
>>> System
>>> + * software should be writing a command to the BMC.
>>> + * - ERROR_STATE. BMC has detected a protocol violation at the
>>> interface level,
>>> + * or the transfer has been aborted. System software
>>> can either
>>> + * use the "Get_Status" control code to request the
>>> nature of
>>> + * the error, or it can just retry the command.
>>> + */
>>> +#define KCS_IDLE_STATE 0
>>> +#define KCS_READ_STATE 1
>>> +#define KCS_WRITE_STATE 2
>>> +#define KCS_ERROR_STATE 3
>>> +
>>> +/* KCS Error Codes */
>>> +#define KCS_NO_ERROR 0x00
>>> +#define KCS_ABORTED_BY_COMMAND 0x01
>>> +#define KCS_ILLEGAL_CONTROL_CODE 0x02
>>> +#define KCS_LENGTH_ERROR 0x06
>>> +#define KCS_UNSPECIFIED_ERROR 0xFF
>>> +
>>> +
>>> +#define KCS_ZERO_DATA 0
>>> +
>>> +/* IPMI 2.0 - Table 9-1, KCS Interface Status Register Bits */
>>> +#define KCS_STR_STATE(state) (state << 6)
>>> +#define KCS_STR_STATE_MASK KCS_STR_STATE(0x3)
>>> +#define KCS_STR_CMD_DAT BIT(3)
>>> +#define KCS_STR_ATN BIT(2)
>>> +#define KCS_STR_IBF BIT(1)
>>> +#define KCS_STR_OBF BIT(0)
>>> +
>>> +
>>> +/***************************** LPC Register
>>> ****************************/
>>> +/* mapped to lpc-bmc@0 IO space */
>>> +#define LPC_HICR0 0x000
>>> +#define LPC_HICR0_LPC3E BIT(7)
>>> +#define LPC_HICR0_LPC2E BIT(6)
>>> +#define LPC_HICR0_LPC1E BIT(5)
>>> +#define LPC_HICR2 0x008
>>> +#define LPC_HICR2_IBFIF3 BIT(3)
>>> +#define LPC_HICR2_IBFIF2 BIT(2)
>>> +#define LPC_HICR2_IBFIF1 BIT(1)
>>> +#define LPC_HICR4 0x010
>>> +#define LPC_HICR4_LADR12AS BIT(7)
>>> +#define LPC_HICR4_KCSENBL BIT(2)
>>> +#define LPC_LADR3H 0x014
>>> +#define LPC_LADR3L 0x018
>>> +#define LPC_LADR12H 0x01C
>>> +#define LPC_LADR12L 0x020
>>> +#define LPC_IDR1 0x024
>>> +#define LPC_IDR2 0x028
>>> +#define LPC_IDR3 0x02C
>>> +#define LPC_ODR1 0x030
>>> +#define LPC_ODR2 0x034
>>> +#define LPC_ODR3 0x038
>>> +#define LPC_STR1 0x03C
>>> +#define LPC_STR2 0x040
>>> +#define LPC_STR3 0x044
>>> +
>>> +/* mapped to lpc-host@80 IO space */
>>> +#define LPC_HICRB 0x080
>>> +#define LPC_HICRB_IBFIF4 BIT(1)
>>> +#define LPC_HICRB_LPC4E BIT(0)
>>> +#define LPC_LADR4 0x090
>>> +#define LPC_IDR4 0x094
>>> +#define LPC_ODR4 0x098
>>> +#define LPC_STR4 0x09C
>>> +
>>> +
>>> +/* IPMI 2.0 - 9.5, KCS Interface Registers */
>>> +struct kcs_ioreg {
>>> + u32 idr; /* Input Data Register */
>>> + u32 odr; /* Output Data Register */
>>> + u32 str; /* Status Register */
>>> +};
>>> +
>>> +static const struct kcs_ioreg kcs_channel_ioregs[KCS_CHANNEL_MAX] = {
>>> + { .idr = LPC_IDR1, .odr = LPC_ODR1, .str = LPC_STR1 },
>>> + { .idr = LPC_IDR2, .odr = LPC_ODR2, .str = LPC_STR2 },
>>> + { .idr = LPC_IDR3, .odr = LPC_ODR3, .str = LPC_STR3 },
>>> + { .idr = LPC_IDR4, .odr = LPC_ODR4, .str = LPC_STR4 },
>>> +};
>>> +
>>> +struct kcs_bmc {
>>> + struct regmap *map;
>>> + int irq;
>>> + spinlock_t lock;
>>> +
>>> + u32 chan;
>>> + int running;
>>> +
>>> + u32 idr;
>>> + u32 odr;
>>> + u32 str;
>>> +
>>> + int kcs_phase;
>>> + u8 abort_phase;
>>> + u8 kcs_error;
>>> +
>>> + wait_queue_head_t queue;
>>> + int data_in_avail;
>>> + int data_in_idx;
>>> + u8 *data_in;
>>> +
>>> + int data_out_idx;
>>> + int data_out_len;
>>> + u8 *data_out;
>>> +
>>> + struct miscdevice miscdev;
>>> + char name[16];
>>> +};
>>> +
>>> +static u8 kcs_inb(struct kcs_bmc *kcs_bmc, u32 reg)
>>> +{
>>> + u32 val = 0;
>>> + int rc;
>>> +
>>> + rc = regmap_read(kcs_bmc->map, reg, &val);
>>> + WARN(rc != 0, "regmap_read failed: %d\n", rc);
>>> +
>>> + return rc == 0 ? (u8) val : 0;
>>> +}
>>> +
>>> +static void kcs_outb(struct kcs_bmc *kcs_bmc, u8 data, u32 reg)
>>> +{
>>> + int rc;
>>> +
>>> + rc = regmap_write(kcs_bmc->map, reg, data);
>>> + WARN(rc != 0, "regmap_write failed: %d\n", rc);
>>> +}
>>> +
>>> +static void kcs_set_state(struct kcs_bmc *kcs_bmc, u8 state)
>>> +{
>>> + int rc;
>>> +
>>> + rc = regmap_update_bits(kcs_bmc->map, kcs_bmc->str,
>>> + KCS_STR_STATE_MASK,
>>> + KCS_STR_STATE(state));
>>> + WARN(rc != 0, "KCS_STR_STATE failed: %d\n", rc);
>>> +}
>>> +
>>> +static void kcs_set_atn(struct kcs_bmc *kcs_bmc, unsigned long set)
>>> +{
>>> + int rc;
>>> +
>>> + rc = regmap_update_bits(kcs_bmc->map, kcs_bmc->str,
>>> + KCS_STR_ATN,
>>> + set != 0 ? KCS_STR_ATN : 0);
>>> + WARN(rc != 0, "KCS_STR_ATN failed: %d\n", rc);
>>> +}
>>> +
>>> +/*********************************************************************
>>> + * AST_usrGuide_KCS.pdf
>>> + * 2. Background:
>>> + * we note D for Data, and C for Cmd/Status, default rules are
>>> + * A. KCS1 / KCS2 ( D / C:X / X+4 )
>>> + * D / C : CA0h / CA4h
>>> + * D / C : CA8h / CACh
>>> + * B. KCS3 ( D / C:XX2h / XX3h )
>>> + * D / C : CA2h / CA3h
>>> + * D / C : CB2h / CB3h
>>> + * C. KCS4
>>> + * D / C : CA4h / CA5h
>>> +
>>> *********************************************************************/
>>> +void kcs_set_addr(struct kcs_bmc *kcs_bmc, u16 addr)
>>> +{
>>> + switch (kcs_bmc->chan) {
>>> + case 1:
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR4,
>>> + LPC_HICR4_LADR12AS,
>>> + 0);
>>> + regmap_write(kcs_bmc->map, LPC_LADR12H, addr >> 8);
>>> + regmap_write(kcs_bmc->map, LPC_LADR12L, addr & 0xFF);
>>> + break;
>>> +
>>> + case 2:
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR4,
>>> + LPC_HICR4_LADR12AS,
>>> + LPC_HICR4_LADR12AS);
>>> + regmap_write(kcs_bmc->map, LPC_LADR12H, addr >> 8);
>>> + regmap_write(kcs_bmc->map, LPC_LADR12L, addr & 0xFF);
>>> + break;
>>> +
>>> + case 3:
>>> + regmap_write(kcs_bmc->map, LPC_LADR3H, addr >> 8);
>>> + regmap_write(kcs_bmc->map, LPC_LADR3L, addr & 0xFF);
>>> + break;
>>> +
>>> + case 4:
>>> + regmap_write(kcs_bmc->map, LPC_LADR4,
>>> + ((addr + 1) << 16) | (addr));
>>> + break;
>>> +
>>> + default:
>>> + break;
>>> + }
>>> +}
>>> +
>>> +static void kcs_enable_channel(struct kcs_bmc *kcs_bmc, int enable)
>>> +{
>>> + switch (kcs_bmc->chan) {
>>> + case 1:
>>> + if (enable) {
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR2,
>>> + LPC_HICR2_IBFIF1, LPC_HICR2_IBFIF1);
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR0,
>>> + LPC_HICR0_LPC1E, LPC_HICR0_LPC1E);
>>> + } else {
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR0,
>>> + LPC_HICR0_LPC1E, 0);
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR2,
>>> + LPC_HICR2_IBFIF1, 0);
>>> + }
>>> + break;
>>> +
>>> + case 2:
>>> + if (enable) {
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR2,
>>> + LPC_HICR2_IBFIF2, LPC_HICR2_IBFIF2);
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR0,
>>> + LPC_HICR0_LPC2E, LPC_HICR0_LPC2E);
>>> + } else {
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR0,
>>> + LPC_HICR0_LPC2E, 0);
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR2,
>>> + LPC_HICR2_IBFIF2, 0);
>>> + }
>>> + break;
>>> +
>>> + case 3:
>>> + if (enable) {
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR2,
>>> + LPC_HICR2_IBFIF3, LPC_HICR2_IBFIF3);
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR0,
>>> + LPC_HICR0_LPC3E, LPC_HICR0_LPC3E);
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR4,
>>> + LPC_HICR4_KCSENBL, LPC_HICR4_KCSENBL);
>>> + } else {
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR0,
>>> + LPC_HICR0_LPC3E, 0);
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR4,
>>> + LPC_HICR4_KCSENBL, 0);
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICR2,
>>> + LPC_HICR2_IBFIF3, 0);
>>> + }
>>> + break;
>>> +
>>> + case 4:
>>> + if (enable) {
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICRB,
>>> + LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E,
>>> + LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E);
>>> + } else {
>>> + regmap_update_bits(kcs_bmc->map, LPC_HICRB,
>>> + LPC_HICRB_IBFIF4 | LPC_HICRB_LPC4E,
>>> + 0);
>>> + }
>>> + break;
>>> +
>>> + default:
>>> + break;
>>> + }
>>> +}
>>> +
>>> +static void kcs_rx_data(struct kcs_bmc *kcs_bmc)
>>> +{
>>> + u8 data;
>>> +
>>> + switch (kcs_bmc->kcs_phase) {
>>> + case KCS_PHASE_WRITE:
>>> + kcs_set_state(kcs_bmc, KCS_WRITE_STATE);
>>> +
>>> + /* set OBF before reading data */
>>> + kcs_outb(kcs_bmc, KCS_ZERO_DATA, kcs_bmc->odr);
>>> +
>>> + if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ)
>>> + kcs_bmc->data_in[kcs_bmc->data_in_idx++] =
>>> + kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> + break;
>>> +
>>> + case KCS_PHASE_WRITE_END:
>>> + kcs_set_state(kcs_bmc, KCS_READ_STATE);
>>> +
>>> + if (kcs_bmc->data_in_idx < KCS_MSG_BUFSIZ)
>>> + kcs_bmc->data_in[kcs_bmc->data_in_idx++] =
>>> + kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> +
>>> + kcs_bmc->kcs_phase = KCS_PHASE_READ;
>>> + if (kcs_bmc->running) {
>>> + kcs_bmc->data_in_avail = 1;
>>> + wake_up_interruptible(&kcs_bmc->queue);
>>> + }
>>> + break;
>>> +
>>> + case KCS_PHASE_READ:
>>> + if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len)
>>> + kcs_set_state(kcs_bmc, KCS_IDLE_STATE);
>>> +
>>> + data = kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> + if (data != KCS_READ_BYTE) {
>>> + kcs_set_state(kcs_bmc, KCS_ERROR_STATE);
>>> + kcs_outb(kcs_bmc, KCS_ZERO_DATA, kcs_bmc->odr);
>>> + break;
>>> + }
>>> +
>>> + if (kcs_bmc->data_out_idx == kcs_bmc->data_out_len) {
>>> + kcs_outb(kcs_bmc, KCS_ZERO_DATA, kcs_bmc->odr);
>>> + kcs_bmc->kcs_phase = KCS_PHASE_IDLE;
>>> + break;
>>> + }
>>> +
>>> + kcs_outb(kcs_bmc, kcs_bmc->data_out[kcs_bmc->data_out_idx++],
>>> + kcs_bmc->odr);
>>> + break;
>>> +
>>> + case KCS_PHASE_ABORT:
>>> + switch (kcs_bmc->abort_phase) {
>>> + case ABORT_PHASE_ERROR1:
>>> + kcs_set_state(kcs_bmc, KCS_READ_STATE);
>>> +
>>> + /* Read the Dummy byte */
>>> + kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> +
>>> + kcs_outb(kcs_bmc, kcs_bmc->kcs_error, kcs_bmc->odr);
>>> + kcs_bmc->abort_phase = ABORT_PHASE_ERROR2;
>>> + break;
>>> +
>>> + case ABORT_PHASE_ERROR2:
>>> + kcs_set_state(kcs_bmc, KCS_IDLE_STATE);
>>> +
>>> + /* Read the Dummy byte */
>>> + kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> +
>>> + kcs_outb(kcs_bmc, KCS_ZERO_DATA, kcs_bmc->odr);
>>> + kcs_bmc->kcs_phase = KCS_PHASE_IDLE;
>>> + kcs_bmc->abort_phase = 0;
>>> + break;
>>> +
>>> + default:
>>> + break;
>>> + }
>>> +
>>> + break;
>>> +
>>> + case KCS_PHASE_ERROR:
>>> + kcs_set_state(kcs_bmc, KCS_ERROR_STATE);
>>> +
>>> + /* Read the Dummy byte */
>>> + kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> +
>>> + kcs_outb(kcs_bmc, KCS_ZERO_DATA, kcs_bmc->odr);
>>> + break;
>>> +
>>> + default:
>>> + kcs_set_state(kcs_bmc, KCS_ERROR_STATE);
>>> +
>>> + /* Read the Dummy byte */
>>> + kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> +
>>> + kcs_outb(kcs_bmc, KCS_ZERO_DATA, kcs_bmc->odr);
>>> + break;
>>> + }
>>> +}
>>> +
>>> +static void kcs_rx_cmd(struct kcs_bmc *kcs_bmc)
>>> +{
>>> + u8 cmd;
>>> +
>>> + kcs_set_state(kcs_bmc, KCS_WRITE_STATE);
>>> +
>>> + /* Dummy data to generate OBF */
>>> + kcs_outb(kcs_bmc, KCS_ZERO_DATA, kcs_bmc->odr);
>>> +
>>> + cmd = kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> + switch (cmd) {
>>> + case KCS_WRITE_START:
>>> + kcs_bmc->data_in_avail = 0;
>>> + kcs_bmc->data_in_idx = 0;
>>> + kcs_bmc->kcs_phase = KCS_PHASE_WRITE;
>>> + kcs_bmc->kcs_error = KCS_NO_ERROR;
>>> + break;
>>> +
>>> + case KCS_WRITE_END:
>>> + kcs_bmc->kcs_phase = KCS_PHASE_WRITE_END;
>>> + break;
>>> +
>>> + case KCS_ABORT:
>>> + if (kcs_bmc->kcs_error == KCS_NO_ERROR)
>>> + kcs_bmc->kcs_error = KCS_ABORTED_BY_COMMAND;
>>> +
>>> + kcs_bmc->kcs_phase = KCS_PHASE_ABORT;
>>> + kcs_bmc->abort_phase = ABORT_PHASE_ERROR1;
>>> + break;
>>> +
>>> + default:
>>> + kcs_bmc->kcs_error = KCS_ILLEGAL_CONTROL_CODE;
>>> + kcs_set_state(kcs_bmc, KCS_ERROR_STATE);
>>> + kcs_outb(kcs_bmc, kcs_bmc->kcs_error, kcs_bmc->odr);
>>> + kcs_bmc->kcs_phase = KCS_PHASE_ERROR;
>>> + break;
>>> + }
>>> +}
>>> +
>>> +/*
>>> + * Whenever the BMC is reset (from power-on or a hard reset), the
>>> State Bits
>>> + * are initialized to "11 - Error State". Doing so allows SMS to
>>> detect that
>>> + * the BMC has been reset and that any message in process has been
>>> terminated
>>> + * by the BMC.
>>> + */
>>> +static void kcs_force_abort(struct kcs_bmc *kcs_bmc)
>>> +{
>>> + unsigned long flags;
>>> +
>>> + spin_lock_irqsave(&kcs_bmc->lock, flags);
>>> + kcs_set_state(kcs_bmc, KCS_ERROR_STATE);
>>> +
>>> + /* Read the Dummy byte */
>>> + kcs_inb(kcs_bmc, kcs_bmc->idr);
>>> +
>>> + kcs_outb(kcs_bmc, KCS_ZERO_DATA, kcs_bmc->odr);
>>> + kcs_bmc->kcs_phase = KCS_PHASE_ERROR;
>>> + spin_unlock_irqrestore(&kcs_bmc->lock, flags);
>>> +}
>>> +
>>> +static irqreturn_t kcs_bmc_irq(int irq, void *arg)
>>> +{
>>> + int rc;
>>> + u32 sts;
>>> + struct kcs_bmc *kcs_bmc = arg;
>>> +
>>> + rc = regmap_read(kcs_bmc->map, kcs_bmc->str, &sts);
>>> + if (rc)
>>> + return IRQ_NONE;
>>> +
>>> + sts &= (KCS_STR_IBF | KCS_STR_CMD_DAT);
>>> +
>>> + switch (sts) {
>>> + case KCS_STR_IBF | KCS_STR_CMD_DAT:
>>> + kcs_rx_cmd(kcs_bmc);
>>> + break;
>>> +
>>> + case KCS_STR_IBF:
>>> + kcs_rx_data(kcs_bmc);
>>> +
>>> + default:
>>> + return IRQ_NONE;
>>> + }
>>> +
>>> + return IRQ_HANDLED;
>>> +}
>>> +
>>> +static int kcs_bmc_config_irq(struct kcs_bmc *kcs_bmc,
>>> + struct platform_device *pdev)
>>> +{
>>> + struct device *dev = &pdev->dev;
>>> + int rc;
>>> +
>>> + kcs_bmc->irq = platform_get_irq(pdev, 0);
>>> + if (!kcs_bmc->irq)
>>> + return -ENODEV;
>>> +
>>> + rc = devm_request_irq(dev, kcs_bmc->irq, kcs_bmc_irq, IRQF_SHARED,
>>> + kcs_bmc->name, kcs_bmc);
>>> + if (rc < 0) {
>>> + dev_warn(dev, "Unable to request IRQ %d\n", kcs_bmc->irq);
>>> + kcs_bmc->irq = 0;
>>> + return rc;
>>> + }
>>> +
>>> + return rc;
>>> +}
>>> +
>>> +
>>> +static inline struct kcs_bmc *file_kcs_bmc(struct file *filp)
>>> +{
>>> + return container_of(filp->private_data, struct kcs_bmc, miscdev);
>>> +}
>>> +
>>> +static int kcs_bmc_open(struct inode *inode, struct file *filp)
>>> +{
>>> + unsigned long flags;
>>> + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp);
>>> +
>>> + if (kcs_bmc->running)
>>> + return -EBUSY;
>>> +
>>> + spin_lock_irqsave(&kcs_bmc->lock, flags);
>>> + kcs_bmc->kcs_phase = KCS_PHASE_IDLE;
>>> + kcs_bmc->running = 1;
>>> + kcs_bmc->data_in_avail = 0;
>>> + spin_unlock_irqrestore(&kcs_bmc->lock, flags);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static unsigned int kcs_bmc_poll(struct file *filp, poll_table *wait)
>>> +{
>>> + unsigned int mask = 0;
>>> + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp);
>>> +
>>> + poll_wait(filp, &kcs_bmc->queue, wait);
>>> +
>>> + if (kcs_bmc->data_in_avail)
>>> + mask |= POLLIN;
>>> +
>>> + if (kcs_bmc->kcs_phase == KCS_PHASE_READ)
>>> + mask |= POLLOUT;
>>> +
>>> + return mask;
>>> +}
>>> +
>>> +static ssize_t kcs_bmc_read(struct file *filp, char *buf,
>>> + size_t count, loff_t *offset)
>>> +{
>>> + int rv;
>>> + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp);
>>> +
>>> + rv = wait_event_interruptible(kcs_bmc->queue,
>>> + kcs_bmc->data_in_avail != 0);
>>> + if (rv < 0)
>>> + return -ERESTARTSYS;
>>> +
>>> + kcs_bmc->data_in_avail = 0;
>>> +
>>> + if (count > kcs_bmc->data_in_idx)
>>> + count = kcs_bmc->data_in_idx;
>>> +
>>> + if (copy_to_user(buf, kcs_bmc->data_in, count))
>>> + return -EFAULT;
>>> +
>>> + return count;
>>> +}
>>> +
>>> +static ssize_t kcs_bmc_write(struct file *filp, const char *buf,
>>> + size_t count, loff_t *offset)
>>> +{
>>> + unsigned long flags;
>>> + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp);
>>> +
>>> + if (count < 1 || count > KCS_MSG_BUFSIZ)
>>> + return -EINVAL;
>>> +
>>> + if (copy_from_user(kcs_bmc->data_out, buf, count))
>>> + return -EFAULT;
>>> +
>>> + spin_lock_irqsave(&kcs_bmc->lock, flags);
>>> + if (kcs_bmc->kcs_phase == KCS_PHASE_READ) {
>>> + kcs_bmc->data_out_idx = 1;
>>> + kcs_bmc->data_out_len = count;
>>> + kcs_outb(kcs_bmc, kcs_bmc->data_out[0], kcs_bmc->odr);
>>> + }
>>> + spin_unlock_irqrestore(&kcs_bmc->lock, flags);
>>> +
>>> + return count;
>>> +}
>>> +
>>> +static long kcs_bmc_ioctl(struct file *filp, unsigned int cmd,
>>> + unsigned long arg)
>>> +{
>>> + long ret = 0;
>>> + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp);
>>> +
>>> + switch (cmd) {
>>> + case KCS_BMC_IOCTL_SMS_ATN:
>>> + kcs_set_atn(kcs_bmc, arg);
>>> + break;
>>> +
>>> + case KCS_BMC_IOCTL_FORCE_ABORT:
>>> + kcs_force_abort(kcs_bmc);
>>> + break;
>>> +
>>> + default:
>>> + ret = -EINVAL;
>>> + break;
>>> + }
>>> +
>>> + return ret;
>>> +}
>>> +
>>> +static int kcs_bmc_release(struct inode *inode, struct file *filp)
>>> +{
>>> + unsigned long flags;
>>> + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp);
>>> +
>>> + spin_lock_irqsave(&kcs_bmc->lock, flags);
>>> + kcs_bmc->running = 0;
>>> + spin_unlock_irqrestore(&kcs_bmc->lock, flags);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct file_operations kcs_bmc_fops = {
>>> + .owner = THIS_MODULE,
>>> + .open = kcs_bmc_open,
>>> + .read = kcs_bmc_read,
>>> + .write = kcs_bmc_write,
>>> + .release = kcs_bmc_release,
>>> + .poll = kcs_bmc_poll,
>>> + .unlocked_ioctl = kcs_bmc_ioctl,
>>> +};
>>> +
>>> +static int kcs_bmc_probe(struct platform_device *pdev)
>>> +{
>>> + struct kcs_bmc *kcs_bmc;
>>> + struct device *dev;
>>> + const struct kcs_ioreg *ioreg;
>>> + u32 chan, addr;
>>> + int rc;
>>> +
>>> + dev = &pdev->dev;
>>> +
>>> + kcs_bmc = devm_kzalloc(dev, sizeof(*kcs_bmc), GFP_KERNEL);
>>> + if (!kcs_bmc)
>>> + return -ENOMEM;
>>> +
>>> + rc = of_property_read_u32(dev->of_node, "kcs_chan", &chan);
>>> + if ((rc != 0) || (chan == 0 || chan > KCS_CHANNEL_MAX)) {
>>> + dev_err(dev, "no valid 'kcs_chan' configured\n");
>>> + return -ENODEV;
>>> + }
>>> +
>>> + rc = of_property_read_u32(dev->of_node, "kcs_addr", &addr);
>>> + if (rc) {
>>> + dev_err(dev, "no valid 'kcs_addr' configured\n");
>>> + return -ENODEV;
>>> + }
>>> +
>>> + kcs_bmc->map = syscon_node_to_regmap(dev->parent->of_node);
>>> + if (IS_ERR(kcs_bmc->map)) {
>>> + dev_err(dev, "Couldn't get regmap\n");
>>> + return -ENODEV;
>>> + }
>>> +
>>> + spin_lock_init(&kcs_bmc->lock);
>>> + kcs_bmc->chan = chan;
>>> +
>>> + ioreg = &kcs_channel_ioregs[chan - 1];
>>> + kcs_bmc->idr = ioreg->idr;
>>> + kcs_bmc->odr = ioreg->odr;
>>> + kcs_bmc->str = ioreg->str;
>>> +
>>> + init_waitqueue_head(&kcs_bmc->queue);
>>> + kcs_bmc->data_in = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>>> + kcs_bmc->data_out = devm_kmalloc(dev, KCS_MSG_BUFSIZ, GFP_KERNEL);
>>> + if (kcs_bmc->data_in == NULL || kcs_bmc->data_out == NULL) {
>>> + dev_err(dev, "Failed to allocate data buffers\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + snprintf(kcs_bmc->name, sizeof(kcs_bmc->name), "ipmi-kcs%u",
>>> chan);
>>> + kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR;
>>> + kcs_bmc->miscdev.name = kcs_bmc->name;
>>> + kcs_bmc->miscdev.fops = &kcs_bmc_fops;
>>> + rc = misc_register(&kcs_bmc->miscdev);
>>> + if (rc) {
>>> + dev_err(dev, "Unable to register device\n");
>>> + return rc;
>>> + }
>>> +
>>> + kcs_set_addr(kcs_bmc, addr);
>>> + kcs_enable_channel(kcs_bmc, 1);
>>> +
>>> + rc = kcs_bmc_config_irq(kcs_bmc, pdev);
>>> + if (rc) {
>>> + dev_err(dev, "Failed to configure IRQ\n");
>>> + misc_deregister(&kcs_bmc->miscdev);
>>> + return rc;
>>> + }
>>> +
>>> + dev_set_drvdata(&pdev->dev, kcs_bmc);
>>> +
>>> + dev_info(dev, "addr=0x%x, idr=0x%x, odr=0x%x, str=0x%x\n",
>>> + addr,
>>> + kcs_bmc->idr, kcs_bmc->odr, kcs_bmc->str);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static int kcs_bmc_remove(struct platform_device *pdev)
>>> +{
>>> + struct kcs_bmc *kcs_bmc = dev_get_drvdata(&pdev->dev);
>>> +
>>> + misc_deregister(&kcs_bmc->miscdev);
>>> +
>>> + return 0;
>>> +}
>>> +
>>> +static const struct of_device_id kcs_bmc_match[] = {
>>> + { .compatible = "aspeed,ast2400-kcs-bmc" },
>>> + { .compatible = "aspeed,ast2500-kcs-bmc" },
>>> + { },
>>> +};
>>> +
>>> +static struct platform_driver kcs_bmc_driver = {
>>> + .driver = {
>>> + .name = DEVICE_NAME,
>>> + .of_match_table = kcs_bmc_match,
>>> + },
>>> + .probe = kcs_bmc_probe,
>>> + .remove = kcs_bmc_remove,
>>> +};
>>> +
>>> +module_platform_driver(kcs_bmc_driver);
>>> +
>>> +MODULE_DEVICE_TABLE(of, kcs_bmc_match);
>>> +MODULE_LICENSE("GPL");
>>> +MODULE_AUTHOR("Haiyue Wang <haiyue.wang@...ux.intel.com>");
>>> +MODULE_DESCRIPTION("Linux device interface to the IPMI KCS
>>> interface");
>>> diff --git a/include/uapi/linux/kcs-bmc.h
>>> b/include/uapi/linux/kcs-bmc.h
>>> new file mode 100644
>>> index 0000000..f0c3ff60
>>> --- /dev/null
>>> +++ b/include/uapi/linux/kcs-bmc.h
>>> @@ -0,0 +1,13 @@
>>> +// SPDX-License-Identifier: GPL-2.0
>>> +// Copyright (c) 2015-2017, Intel Corporation.
>>> +
>>> +#ifndef _UAPI_LINUX_KCS_BMC_H
>>> +#define _UAPI_LINUX_KCS_BMC_H
>>> +
>>> +#include <linux/ioctl.h>
>>> +
>>> +#define __KCS_BMC_IOCTL_MAGIC 'K'
>>> +#define KCS_BMC_IOCTL_SMS_ATN _IOW(__KCS_BMC_IOCTL_MAGIC, 1,
>>> unsigned long)
>>> +#define KCS_BMC_IOCTL_FORCE_ABORT _IO(__KCS_BMC_IOCTL_MAGIC, 2)
>>> +
>>> +#endif /* _UAPI_LINUX_KCS_BMC_H */
>>
>>
>
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