mirror of
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A small bug fix and a new driver for acting as an IPMI device.
I was on vacation during the merge window (a long vacation) but this is a bug fix that should go in and a new driver that shouldn't hurt anything. This has been in linux-next for a month or so. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEABECAAYFAlgKVpoACgkQIXnXXONXERdGBACeONBS0wOf4Rv+bxSOdeJcTwLJ rmoAoJ2R0BpWE1imvcC+AqXOoqg2c48k =P4Dz -----END PGP SIGNATURE----- Merge tag 'for-linus-4.9-2' of git://git.code.sf.net/p/openipmi/linux-ipmi Pull IPMI updates from Corey Minyard: "A small bug fix and a new driver for acting as an IPMI device. I was on vacation during the merge window (a long vacation) but this is a bug fix that should go in and a new driver that shouldn't hurt anything. This has been in linux-next for a month or so" * tag 'for-linus-4.9-2' of git://git.code.sf.net/p/openipmi/linux-ipmi: ipmi: fix crash on reading version from proc after unregisted bmc ipmi/bt-bmc: remove redundant return value check of platform_get_resource() ipmi/bt-bmc: add a dependency on ARCH_ASPEED ipmi: Fix ioremap error handling in bt-bmc ipmi: add an Aspeed BT IPMI BMC driver
This commit is contained in:
Linus Torvalds
commit
5766e9d25f
@ -0,0 +1,23 @@
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* Aspeed BT (Block Transfer) IPMI interface
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The Aspeed SOCs (AST2400 and AST2500) are commonly used as BMCs
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(BaseBoard Management Controllers) and the BT interface can be used to
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perform in-band IPMI communication with their host.
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Required properties:
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- compatible : should be "aspeed,ast2400-bt-bmc"
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- reg: physical address and size of the registers
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Optional properties:
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- interrupts: interrupt generated by the BT interface. without an
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interrupt, the driver will operate in poll mode.
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Example:
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ibt@1e789140 {
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compatible = "aspeed,ast2400-bt-bmc";
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reg = <0x1e789140 0x18>;
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interrupts = <8>;
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};
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@ -21,7 +21,7 @@ obj-y += video/
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obj-y += idle/
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# IPMI must come before ACPI in order to provide IPMI opregion support
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obj-$(CONFIG_IPMI_HANDLER) += char/ipmi/
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obj-y += char/ipmi/
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obj-$(CONFIG_ACPI) += acpi/
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obj-$(CONFIG_SFI) += sfi/
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@ -76,3 +76,11 @@ config IPMI_POWEROFF
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the IPMI management controller is capable of this.
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endif # IPMI_HANDLER
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config ASPEED_BT_IPMI_BMC
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depends on ARCH_ASPEED
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tristate "BT IPMI bmc driver"
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help
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Provides a driver for the BT (Block Transfer) IPMI interface
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found on Aspeed SOCs (AST2400 and AST2500). The driver
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implements the BMC side of the BT interface.
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@ -11,3 +11,4 @@ obj-$(CONFIG_IPMI_SSIF) += ipmi_ssif.o
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obj-$(CONFIG_IPMI_POWERNV) += ipmi_powernv.o
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obj-$(CONFIG_IPMI_WATCHDOG) += ipmi_watchdog.o
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obj-$(CONFIG_IPMI_POWEROFF) += ipmi_poweroff.o
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obj-$(CONFIG_ASPEED_BT_IPMI_BMC) += bt-bmc.o
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505
drivers/char/ipmi/bt-bmc.c
Normal file
505
drivers/char/ipmi/bt-bmc.c
Normal file
@ -0,0 +1,505 @@
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/*
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* Copyright (c) 2015-2016, IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/atomic.h>
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#include <linux/bt-bmc.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/miscdevice.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/poll.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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/*
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* This is a BMC device used to communicate to the host
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*/
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#define DEVICE_NAME "ipmi-bt-host"
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#define BT_IO_BASE 0xe4
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#define BT_IRQ 10
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#define BT_CR0 0x0
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#define BT_CR0_IO_BASE 16
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#define BT_CR0_IRQ 12
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#define BT_CR0_EN_CLR_SLV_RDP 0x8
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#define BT_CR0_EN_CLR_SLV_WRP 0x4
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#define BT_CR0_ENABLE_IBT 0x1
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#define BT_CR1 0x4
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#define BT_CR1_IRQ_H2B 0x01
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#define BT_CR1_IRQ_HBUSY 0x40
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#define BT_CR2 0x8
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#define BT_CR2_IRQ_H2B 0x01
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#define BT_CR2_IRQ_HBUSY 0x40
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#define BT_CR3 0xc
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#define BT_CTRL 0x10
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#define BT_CTRL_B_BUSY 0x80
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#define BT_CTRL_H_BUSY 0x40
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#define BT_CTRL_OEM0 0x20
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#define BT_CTRL_SMS_ATN 0x10
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#define BT_CTRL_B2H_ATN 0x08
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#define BT_CTRL_H2B_ATN 0x04
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#define BT_CTRL_CLR_RD_PTR 0x02
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#define BT_CTRL_CLR_WR_PTR 0x01
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#define BT_BMC2HOST 0x14
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#define BT_INTMASK 0x18
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#define BT_INTMASK_B2H_IRQEN 0x01
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#define BT_INTMASK_B2H_IRQ 0x02
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#define BT_INTMASK_BMC_HWRST 0x80
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#define BT_BMC_BUFFER_SIZE 256
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struct bt_bmc {
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struct device dev;
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struct miscdevice miscdev;
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void __iomem *base;
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int irq;
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wait_queue_head_t queue;
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struct timer_list poll_timer;
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struct mutex mutex;
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};
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static atomic_t open_count = ATOMIC_INIT(0);
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static u8 bt_inb(struct bt_bmc *bt_bmc, int reg)
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{
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return ioread8(bt_bmc->base + reg);
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}
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static void bt_outb(struct bt_bmc *bt_bmc, u8 data, int reg)
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{
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iowrite8(data, bt_bmc->base + reg);
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}
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static void clr_rd_ptr(struct bt_bmc *bt_bmc)
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{
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bt_outb(bt_bmc, BT_CTRL_CLR_RD_PTR, BT_CTRL);
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}
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static void clr_wr_ptr(struct bt_bmc *bt_bmc)
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{
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bt_outb(bt_bmc, BT_CTRL_CLR_WR_PTR, BT_CTRL);
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}
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static void clr_h2b_atn(struct bt_bmc *bt_bmc)
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{
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bt_outb(bt_bmc, BT_CTRL_H2B_ATN, BT_CTRL);
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}
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static void set_b_busy(struct bt_bmc *bt_bmc)
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{
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if (!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY))
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bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);
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}
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static void clr_b_busy(struct bt_bmc *bt_bmc)
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{
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if (bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_B_BUSY)
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bt_outb(bt_bmc, BT_CTRL_B_BUSY, BT_CTRL);
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}
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static void set_b2h_atn(struct bt_bmc *bt_bmc)
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{
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bt_outb(bt_bmc, BT_CTRL_B2H_ATN, BT_CTRL);
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}
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static u8 bt_read(struct bt_bmc *bt_bmc)
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{
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return bt_inb(bt_bmc, BT_BMC2HOST);
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}
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static ssize_t bt_readn(struct bt_bmc *bt_bmc, u8 *buf, size_t n)
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{
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int i;
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for (i = 0; i < n; i++)
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buf[i] = bt_read(bt_bmc);
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return n;
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}
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static void bt_write(struct bt_bmc *bt_bmc, u8 c)
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{
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bt_outb(bt_bmc, c, BT_BMC2HOST);
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}
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static ssize_t bt_writen(struct bt_bmc *bt_bmc, u8 *buf, size_t n)
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{
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int i;
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for (i = 0; i < n; i++)
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bt_write(bt_bmc, buf[i]);
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return n;
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}
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static void set_sms_atn(struct bt_bmc *bt_bmc)
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{
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bt_outb(bt_bmc, BT_CTRL_SMS_ATN, BT_CTRL);
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}
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static struct bt_bmc *file_bt_bmc(struct file *file)
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{
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return container_of(file->private_data, struct bt_bmc, miscdev);
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}
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static int bt_bmc_open(struct inode *inode, struct file *file)
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{
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struct bt_bmc *bt_bmc = file_bt_bmc(file);
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if (atomic_inc_return(&open_count) == 1) {
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clr_b_busy(bt_bmc);
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return 0;
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}
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atomic_dec(&open_count);
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return -EBUSY;
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}
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/*
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* The BT (Block Transfer) interface means that entire messages are
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* buffered by the host before a notification is sent to the BMC that
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* there is data to be read. The first byte is the length and the
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* message data follows. The read operation just tries to capture the
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* whole before returning it to userspace.
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*
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* BT Message format :
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*
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* Byte 1 Byte 2 Byte 3 Byte 4 Byte 5:N
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* Length NetFn/LUN Seq Cmd Data
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*
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*/
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static ssize_t bt_bmc_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct bt_bmc *bt_bmc = file_bt_bmc(file);
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u8 len;
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int len_byte = 1;
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u8 kbuffer[BT_BMC_BUFFER_SIZE];
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ssize_t ret = 0;
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ssize_t nread;
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if (!access_ok(VERIFY_WRITE, buf, count))
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return -EFAULT;
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WARN_ON(*ppos);
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if (wait_event_interruptible(bt_bmc->queue,
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bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))
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return -ERESTARTSYS;
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mutex_lock(&bt_bmc->mutex);
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if (unlikely(!(bt_inb(bt_bmc, BT_CTRL) & BT_CTRL_H2B_ATN))) {
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ret = -EIO;
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goto out_unlock;
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}
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set_b_busy(bt_bmc);
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clr_h2b_atn(bt_bmc);
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clr_rd_ptr(bt_bmc);
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/*
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* The BT frames start with the message length, which does not
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* include the length byte.
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*/
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kbuffer[0] = bt_read(bt_bmc);
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len = kbuffer[0];
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/* We pass the length back to userspace as well */
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if (len + 1 > count)
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len = count - 1;
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while (len) {
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nread = min_t(ssize_t, len, sizeof(kbuffer) - len_byte);
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bt_readn(bt_bmc, kbuffer + len_byte, nread);
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if (copy_to_user(buf, kbuffer, nread + len_byte)) {
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ret = -EFAULT;
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break;
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}
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len -= nread;
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buf += nread + len_byte;
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ret += nread + len_byte;
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len_byte = 0;
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}
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clr_b_busy(bt_bmc);
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out_unlock:
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mutex_unlock(&bt_bmc->mutex);
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return ret;
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}
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/*
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* BT Message response format :
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*
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* Byte 1 Byte 2 Byte 3 Byte 4 Byte 5 Byte 6:N
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* Length NetFn/LUN Seq Cmd Code Data
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*/
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static ssize_t bt_bmc_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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struct bt_bmc *bt_bmc = file_bt_bmc(file);
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u8 kbuffer[BT_BMC_BUFFER_SIZE];
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ssize_t ret = 0;
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ssize_t nwritten;
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/*
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* send a minimum response size
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*/
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if (count < 5)
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return -EINVAL;
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||||
|
||||
if (!access_ok(VERIFY_READ, buf, count))
|
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return -EFAULT;
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||||
|
||||
WARN_ON(*ppos);
|
||||
|
||||
/*
|
||||
* There's no interrupt for clearing bmc busy so we have to
|
||||
* poll
|
||||
*/
|
||||
if (wait_event_interruptible(bt_bmc->queue,
|
||||
!(bt_inb(bt_bmc, BT_CTRL) &
|
||||
(BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN))))
|
||||
return -ERESTARTSYS;
|
||||
|
||||
mutex_lock(&bt_bmc->mutex);
|
||||
|
||||
if (unlikely(bt_inb(bt_bmc, BT_CTRL) &
|
||||
(BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN))) {
|
||||
ret = -EIO;
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
clr_wr_ptr(bt_bmc);
|
||||
|
||||
while (count) {
|
||||
nwritten = min_t(ssize_t, count, sizeof(kbuffer));
|
||||
if (copy_from_user(&kbuffer, buf, nwritten)) {
|
||||
ret = -EFAULT;
|
||||
break;
|
||||
}
|
||||
|
||||
bt_writen(bt_bmc, kbuffer, nwritten);
|
||||
|
||||
count -= nwritten;
|
||||
buf += nwritten;
|
||||
ret += nwritten;
|
||||
}
|
||||
|
||||
set_b2h_atn(bt_bmc);
|
||||
|
||||
out_unlock:
|
||||
mutex_unlock(&bt_bmc->mutex);
|
||||
return ret;
|
||||
}
|
||||
|
||||
static long bt_bmc_ioctl(struct file *file, unsigned int cmd,
|
||||
unsigned long param)
|
||||
{
|
||||
struct bt_bmc *bt_bmc = file_bt_bmc(file);
|
||||
|
||||
switch (cmd) {
|
||||
case BT_BMC_IOCTL_SMS_ATN:
|
||||
set_sms_atn(bt_bmc);
|
||||
return 0;
|
||||
}
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int bt_bmc_release(struct inode *inode, struct file *file)
|
||||
{
|
||||
struct bt_bmc *bt_bmc = file_bt_bmc(file);
|
||||
|
||||
atomic_dec(&open_count);
|
||||
set_b_busy(bt_bmc);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static unsigned int bt_bmc_poll(struct file *file, poll_table *wait)
|
||||
{
|
||||
struct bt_bmc *bt_bmc = file_bt_bmc(file);
|
||||
unsigned int mask = 0;
|
||||
u8 ctrl;
|
||||
|
||||
poll_wait(file, &bt_bmc->queue, wait);
|
||||
|
||||
ctrl = bt_inb(bt_bmc, BT_CTRL);
|
||||
|
||||
if (ctrl & BT_CTRL_H2B_ATN)
|
||||
mask |= POLLIN;
|
||||
|
||||
if (!(ctrl & (BT_CTRL_H_BUSY | BT_CTRL_B2H_ATN)))
|
||||
mask |= POLLOUT;
|
||||
|
||||
return mask;
|
||||
}
|
||||
|
||||
static const struct file_operations bt_bmc_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.open = bt_bmc_open,
|
||||
.read = bt_bmc_read,
|
||||
.write = bt_bmc_write,
|
||||
.release = bt_bmc_release,
|
||||
.poll = bt_bmc_poll,
|
||||
.unlocked_ioctl = bt_bmc_ioctl,
|
||||
};
|
||||
|
||||
static void poll_timer(unsigned long data)
|
||||
{
|
||||
struct bt_bmc *bt_bmc = (void *)data;
|
||||
|
||||
bt_bmc->poll_timer.expires += msecs_to_jiffies(500);
|
||||
wake_up(&bt_bmc->queue);
|
||||
add_timer(&bt_bmc->poll_timer);
|
||||
}
|
||||
|
||||
static irqreturn_t bt_bmc_irq(int irq, void *arg)
|
||||
{
|
||||
struct bt_bmc *bt_bmc = arg;
|
||||
u32 reg;
|
||||
|
||||
reg = ioread32(bt_bmc->base + BT_CR2);
|
||||
reg &= BT_CR2_IRQ_H2B | BT_CR2_IRQ_HBUSY;
|
||||
if (!reg)
|
||||
return IRQ_NONE;
|
||||
|
||||
/* ack pending IRQs */
|
||||
iowrite32(reg, bt_bmc->base + BT_CR2);
|
||||
|
||||
wake_up(&bt_bmc->queue);
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static int bt_bmc_config_irq(struct bt_bmc *bt_bmc,
|
||||
struct platform_device *pdev)
|
||||
{
|
||||
struct device *dev = &pdev->dev;
|
||||
u32 reg;
|
||||
int rc;
|
||||
|
||||
bt_bmc->irq = platform_get_irq(pdev, 0);
|
||||
if (!bt_bmc->irq)
|
||||
return -ENODEV;
|
||||
|
||||
rc = devm_request_irq(dev, bt_bmc->irq, bt_bmc_irq, IRQF_SHARED,
|
||||
DEVICE_NAME, bt_bmc);
|
||||
if (rc < 0) {
|
||||
dev_warn(dev, "Unable to request IRQ %d\n", bt_bmc->irq);
|
||||
bt_bmc->irq = 0;
|
||||
return rc;
|
||||
}
|
||||
|
||||
/*
|
||||
* Configure IRQs on the bmc clearing the H2B and HBUSY bits;
|
||||
* H2B will be asserted when the bmc has data for us; HBUSY
|
||||
* will be cleared (along with B2H) when we can write the next
|
||||
* message to the BT buffer
|
||||
*/
|
||||
reg = ioread32(bt_bmc->base + BT_CR1);
|
||||
reg |= BT_CR1_IRQ_H2B | BT_CR1_IRQ_HBUSY;
|
||||
iowrite32(reg, bt_bmc->base + BT_CR1);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bt_bmc_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct bt_bmc *bt_bmc;
|
||||
struct device *dev;
|
||||
struct resource *res;
|
||||
int rc;
|
||||
|
||||
if (!pdev || !pdev->dev.of_node)
|
||||
return -ENODEV;
|
||||
|
||||
dev = &pdev->dev;
|
||||
dev_info(dev, "Found bt bmc device\n");
|
||||
|
||||
bt_bmc = devm_kzalloc(dev, sizeof(*bt_bmc), GFP_KERNEL);
|
||||
if (!bt_bmc)
|
||||
return -ENOMEM;
|
||||
|
||||
dev_set_drvdata(&pdev->dev, bt_bmc);
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
bt_bmc->base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(bt_bmc->base))
|
||||
return PTR_ERR(bt_bmc->base);
|
||||
|
||||
mutex_init(&bt_bmc->mutex);
|
||||
init_waitqueue_head(&bt_bmc->queue);
|
||||
|
||||
bt_bmc->miscdev.minor = MISC_DYNAMIC_MINOR,
|
||||
bt_bmc->miscdev.name = DEVICE_NAME,
|
||||
bt_bmc->miscdev.fops = &bt_bmc_fops,
|
||||
bt_bmc->miscdev.parent = dev;
|
||||
rc = misc_register(&bt_bmc->miscdev);
|
||||
if (rc) {
|
||||
dev_err(dev, "Unable to register misc device\n");
|
||||
return rc;
|
||||
}
|
||||
|
||||
bt_bmc_config_irq(bt_bmc, pdev);
|
||||
|
||||
if (bt_bmc->irq) {
|
||||
dev_info(dev, "Using IRQ %d\n", bt_bmc->irq);
|
||||
} else {
|
||||
dev_info(dev, "No IRQ; using timer\n");
|
||||
setup_timer(&bt_bmc->poll_timer, poll_timer,
|
||||
(unsigned long)bt_bmc);
|
||||
bt_bmc->poll_timer.expires = jiffies + msecs_to_jiffies(10);
|
||||
add_timer(&bt_bmc->poll_timer);
|
||||
}
|
||||
|
||||
iowrite32((BT_IO_BASE << BT_CR0_IO_BASE) |
|
||||
(BT_IRQ << BT_CR0_IRQ) |
|
||||
BT_CR0_EN_CLR_SLV_RDP |
|
||||
BT_CR0_EN_CLR_SLV_WRP |
|
||||
BT_CR0_ENABLE_IBT,
|
||||
bt_bmc->base + BT_CR0);
|
||||
|
||||
clr_b_busy(bt_bmc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int bt_bmc_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct bt_bmc *bt_bmc = dev_get_drvdata(&pdev->dev);
|
||||
|
||||
misc_deregister(&bt_bmc->miscdev);
|
||||
if (!bt_bmc->irq)
|
||||
del_timer_sync(&bt_bmc->poll_timer);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id bt_bmc_match[] = {
|
||||
{ .compatible = "aspeed,ast2400-bt-bmc" },
|
||||
{ },
|
||||
};
|
||||
|
||||
static struct platform_driver bt_bmc_driver = {
|
||||
.driver = {
|
||||
.name = DEVICE_NAME,
|
||||
.of_match_table = bt_bmc_match,
|
||||
},
|
||||
.probe = bt_bmc_probe,
|
||||
.remove = bt_bmc_remove,
|
||||
};
|
||||
|
||||
module_platform_driver(bt_bmc_driver);
|
||||
|
||||
MODULE_DEVICE_TABLE(of, bt_bmc_match);
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_AUTHOR("Alistair Popple <alistair@popple.id.au>");
|
||||
MODULE_DESCRIPTION("Linux device interface to the BT interface");
|
||||
@ -2891,11 +2891,11 @@ int ipmi_register_smi(const struct ipmi_smi_handlers *handlers,
|
||||
intf->curr_channel = IPMI_MAX_CHANNELS;
|
||||
}
|
||||
|
||||
rv = ipmi_bmc_register(intf, i);
|
||||
|
||||
if (rv == 0)
|
||||
rv = add_proc_entries(intf, i);
|
||||
|
||||
rv = ipmi_bmc_register(intf, i);
|
||||
|
||||
out:
|
||||
if (rv) {
|
||||
if (intf->proc_dir)
|
||||
@ -2982,8 +2982,6 @@ int ipmi_unregister_smi(ipmi_smi_t intf)
|
||||
int intf_num = intf->intf_num;
|
||||
ipmi_user_t user;
|
||||
|
||||
ipmi_bmc_unregister(intf);
|
||||
|
||||
mutex_lock(&smi_watchers_mutex);
|
||||
mutex_lock(&ipmi_interfaces_mutex);
|
||||
intf->intf_num = -1;
|
||||
@ -3007,6 +3005,7 @@ int ipmi_unregister_smi(ipmi_smi_t intf)
|
||||
mutex_unlock(&ipmi_interfaces_mutex);
|
||||
|
||||
remove_proc_entries(intf);
|
||||
ipmi_bmc_unregister(intf);
|
||||
|
||||
/*
|
||||
* Call all the watcher interfaces to tell them that
|
||||
|
||||
@ -75,6 +75,7 @@ header-y += bpf_perf_event.h
|
||||
header-y += bpf.h
|
||||
header-y += bpqether.h
|
||||
header-y += bsg.h
|
||||
header-y += bt-bmc.h
|
||||
header-y += btrfs.h
|
||||
header-y += can.h
|
||||
header-y += capability.h
|
||||
|
||||
18
include/uapi/linux/bt-bmc.h
Normal file
18
include/uapi/linux/bt-bmc.h
Normal file
@ -0,0 +1,18 @@
|
||||
/*
|
||||
* Copyright (c) 2015-2016, IBM Corporation.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* as published by the Free Software Foundation; either version
|
||||
* 2 of the License, or (at your option) any later version.
|
||||
*/
|
||||
|
||||
#ifndef _UAPI_LINUX_BT_BMC_H
|
||||
#define _UAPI_LINUX_BT_BMC_H
|
||||
|
||||
#include <linux/ioctl.h>
|
||||
|
||||
#define __BT_BMC_IOCTL_MAGIC 0xb1
|
||||
#define BT_BMC_IOCTL_SMS_ATN _IO(__BT_BMC_IOCTL_MAGIC, 0x00)
|
||||
|
||||
#endif /* _UAPI_LINUX_BT_BMC_H */
|
||||
Loading…
Reference in New Issue
Block a user