Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751757AbeAPLnA (ORCPT + 1 other); Tue, 16 Jan 2018 06:43:00 -0500 Received: from mga05.intel.com ([192.55.52.43]:46837 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751195AbeAPLm6 (ORCPT ); Tue, 16 Jan 2018 06:42:58 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,368,1511856000"; d="scan'208";a="166473642" From: Haiyue Wang To: minyard@acm.org, joel@jms.id.au, openbmc@lists.ozlabs.org, openipmi-developer@lists.sourceforge.net, linux-kernel@vger.kernel.org Cc: Haiyue Wang , andriy.shevchenko@intel.com Subject: [PATCH arm/aspeed/ast2500 v1] ipmi: add an Aspeed KCS IPMI BMC driver Date: Tue, 16 Jan 2018 19:43:43 +0800 Message-Id: <1516103023-19244-1-git-send-email-haiyue.wang@linux.intel.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: The KCS (Keyboard Controller Style) interface is used to perform in-band IPMI communication between a server host and its BMC (BaseBoard Management Controllers). This driver exposes the KCS interface on ASpeed SOCs (AST2400 and AST2500) as a character device. Such SOCs are commonly used as BMCs and this driver implements the BMC side of the KCS interface. Signed-off-by: Haiyue Wang --- .../devicetree/bindings/ipmi/aspeed-kcs-bmc.txt | 26 + drivers/char/ipmi/Kconfig | 9 + drivers/char/ipmi/Makefile | 1 + drivers/char/ipmi/kcs-bmc.c | 744 +++++++++++++++++++++ include/uapi/linux/kcs-bmc.h | 14 + 5 files changed, 794 insertions(+) create mode 100644 Documentation/devicetree/bindings/ipmi/aspeed-kcs-bmc.txt create mode 100644 drivers/char/ipmi/kcs-bmc.c create mode 100644 include/uapi/linux/kcs-bmc.h diff --git a/Documentation/devicetree/bindings/ipmi/aspeed-kcs-bmc.txt b/Documentation/devicetree/bindings/ipmi/aspeed-kcs-bmc.txt new file mode 100644 index 0000000..dd0c73d --- /dev/null +++ b/Documentation/devicetree/bindings/ipmi/aspeed-kcs-bmc.txt @@ -0,0 +1,26 @@ +* Aspeed KCS (Keyboard Controller Style) IPMI interface + +The Aspeed SOCs (AST2400 and AST2500) are commonly used as BMCs +(BaseBoard Management Controllers) and the KCS interface can be +used to perform in-band IPMI communication with their host. + +Required properties: +- compatible : should be one of + "aspeed,ast2400-kcs-bmc" + "aspeed,ast2500-kcs-bmc" +- interrupts : interrupt generated by the controller +- kcs_chan : The LPC channel number in the controller +- kcs_addr : The host CPU IO map address + + +Example: + + kcs3: kcs3@0 { + compatible = "aspeed,ast2500-kcs-bmc"; + reg = <0x0 0x80>; + interrupts = <8>; + kcs_chan = <3>; + kcs_addr = <0xCA2>; + status = "okay"; + }; + diff --git a/drivers/char/ipmi/Kconfig b/drivers/char/ipmi/Kconfig index 3544abc..36132f8 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 + select REGMAP_MMIO + 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..d6eab0b --- /dev/null +++ b/drivers/char/ipmi/kcs-bmc.c @@ -0,0 +1,744 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2015-2018, Intel Corporation. + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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_SMS_ATN BIT(2) +#define KCS_STR_IBF BIT(1) +#define KCS_STR_OBF BIT(0) + + +/* 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_ioreg_map[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; + 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; +}; + +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 inline void kcs_set_state(struct kcs_bmc *kcs_bmc, u8 state) +{ + regmap_update_bits(kcs_bmc->map, kcs_bmc->str, KCS_STR_STATE_MASK, + KCS_STR_STATE(state)); +} + +static inline void kcs_set_atn(struct kcs_bmc *kcs_bmc) +{ + regmap_update_bits(kcs_bmc->map, kcs_bmc->str, KCS_STR_SMS_ATN, + KCS_STR_SMS_ATN); +} + +static inline void kcs_clear_atn(struct kcs_bmc *kcs_bmc) +{ + regmap_update_bits(kcs_bmc->map, kcs_bmc->str, KCS_STR_SMS_ATN, + 0); +} + +/* + * 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 + */ +static 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) +{ + struct kcs_bmc *kcs_bmc = arg; + u32 sts; + + if (regmap_read(kcs_bmc->map, kcs_bmc->str, &sts) != 0) + 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 irq; + + irq = platform_get_irq(pdev, 0); + if (irq < 0) + return irq; + + return devm_request_irq(dev, irq, kcs_bmc_irq, IRQF_SHARED, + dev_name(dev), kcs_bmc); +} + + +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) +{ + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp); + unsigned long flags; + + 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) +{ + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp); + unsigned int mask = 0; + + 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) +{ + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp); + int rv; + + 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) +{ + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp); + unsigned long flags; + + 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) +{ + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp); + long ret = 0; + + switch (cmd) { + case KCS_BMC_IOCTL_SET_ATN: + kcs_set_atn(kcs_bmc); + break; + + case KCS_BMC_IOCTL_CLR_ATN: + kcs_clear_atn(kcs_bmc); + 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) +{ + struct kcs_bmc *kcs_bmc = file_kcs_bmc(filp); + unsigned long flags; + + 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 device *dev = &pdev->dev; + const struct kcs_ioreg *ioreg; + struct kcs_bmc *kcs_bmc; + u32 chan, addr; + int rc; + + 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; + } + + dev_set_name(dev, "ipmi-kcs%u", chan); + + spin_lock_init(&kcs_bmc->lock); + kcs_bmc->chan = chan; + + ioreg = &kcs_ioreg_map[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; + } + + kcs_bmc->miscdev.minor = MISC_DYNAMIC_MINOR; + kcs_bmc->miscdev.name = dev_name(dev); + 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) { + 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 v2"); +MODULE_AUTHOR("Haiyue Wang "); +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..d1550d3 --- /dev/null +++ b/include/uapi/linux/kcs-bmc.h @@ -0,0 +1,14 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2015-2018, Intel Corporation. + +#ifndef _UAPI_LINUX_KCS_BMC_H +#define _UAPI_LINUX_KCS_BMC_H + +#include + +#define __KCS_BMC_IOCTL_MAGIC 'K' +#define KCS_BMC_IOCTL_SET_ATN _IO(__KCS_BMC_IOCTL_MAGIC, 1) +#define KCS_BMC_IOCTL_CLR_ATN _IO(__KCS_BMC_IOCTL_MAGIC, 2) +#define KCS_BMC_IOCTL_FORCE_ABORT _IO(__KCS_BMC_IOCTL_MAGIC, 3) + +#endif /* _UAPI_LINUX_KCS_BMC_H */ -- 2.7.4