696 lines
16 KiB
C
696 lines
16 KiB
C
/* cpwatchdog.c - driver implementation for hardware watchdog
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* timers found on Sun Microsystems CP1400 and CP1500 boards.
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*
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* This device supports both the generic Linux watchdog
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* interface and Solaris-compatible ioctls as best it is
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* able.
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*
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* NOTE: CP1400 systems appear to have a defective intr_mask
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* register on the PLD, preventing the disabling of
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* timer interrupts. We use a timer to periodically
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* reset 'stopped' watchdogs on affected platforms.
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*
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* Copyright (c) 2000 Eric Brower (ebrower@usa.net)
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* Copyright (C) 2008 David S. Miller <davem@davemloft.net>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/major.h>
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#include <linux/init.h>
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#include <linux/miscdevice.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/timer.h>
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#include <linux/smp_lock.h>
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#include <linux/io.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/watchdog.h>
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#define DRIVER_NAME "cpwd"
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#define PFX DRIVER_NAME ": "
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#define WD_OBPNAME "watchdog"
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#define WD_BADMODEL "SUNW,501-5336"
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#define WD_BTIMEOUT (jiffies + (HZ * 1000))
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#define WD_BLIMIT 0xFFFF
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#define WD0_MINOR 212
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#define WD1_MINOR 213
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#define WD2_MINOR 214
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/* Internal driver definitions. */
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#define WD0_ID 0
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#define WD1_ID 1
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#define WD2_ID 2
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#define WD_NUMDEVS 3
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#define WD_INTR_OFF 0
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#define WD_INTR_ON 1
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#define WD_STAT_INIT 0x01 /* Watchdog timer is initialized */
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#define WD_STAT_BSTOP 0x02 /* Watchdog timer is brokenstopped */
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#define WD_STAT_SVCD 0x04 /* Watchdog interrupt occurred */
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/* Register value definitions
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*/
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#define WD0_INTR_MASK 0x01 /* Watchdog device interrupt masks */
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#define WD1_INTR_MASK 0x02
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#define WD2_INTR_MASK 0x04
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#define WD_S_RUNNING 0x01 /* Watchdog device status running */
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#define WD_S_EXPIRED 0x02 /* Watchdog device status expired */
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struct cpwd {
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void __iomem *regs;
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spinlock_t lock;
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unsigned int irq;
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unsigned long timeout;
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bool enabled;
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bool reboot;
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bool broken;
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bool initialized;
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struct {
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struct miscdevice misc;
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void __iomem *regs;
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u8 intr_mask;
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u8 runstatus;
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u16 timeout;
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} devs[WD_NUMDEVS];
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};
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static struct cpwd *cpwd_device;
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/* Sun uses Altera PLD EPF8820ATC144-4
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* providing three hardware watchdogs:
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*
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* 1) RIC - sends an interrupt when triggered
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* 2) XIR - asserts XIR_B_RESET when triggered, resets CPU
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* 3) POR - asserts POR_B_RESET when triggered, resets CPU, backplane, board
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*
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*** Timer register block definition (struct wd_timer_regblk)
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*
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* dcntr and limit registers (halfword access):
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* -------------------
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* | 15 | ...| 1 | 0 |
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* -------------------
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* |- counter val -|
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* -------------------
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* dcntr - Current 16-bit downcounter value.
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* When downcounter reaches '0' watchdog expires.
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* Reading this register resets downcounter with 'limit' value.
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* limit - 16-bit countdown value in 1/10th second increments.
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* Writing this register begins countdown with input value.
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* Reading from this register does not affect counter.
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* NOTES: After watchdog reset, dcntr and limit contain '1'
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*
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* status register (byte access):
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* ---------------------------
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* | 7 | ... | 2 | 1 | 0 |
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* --------------+------------
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* |- UNUSED -| EXP | RUN |
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* ---------------------------
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* status- Bit 0 - Watchdog is running
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* Bit 1 - Watchdog has expired
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*
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*** PLD register block definition (struct wd_pld_regblk)
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*
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* intr_mask register (byte access):
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* ---------------------------------
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* | 7 | ... | 3 | 2 | 1 | 0 |
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* +-------------+------------------
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* |- UNUSED -| WD3 | WD2 | WD1 |
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* ---------------------------------
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* WD3 - 1 == Interrupt disabled for watchdog 3
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* WD2 - 1 == Interrupt disabled for watchdog 2
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* WD1 - 1 == Interrupt disabled for watchdog 1
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*
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* pld_status register (byte access):
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* UNKNOWN, MAGICAL MYSTERY REGISTER
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*
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*/
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#define WD_TIMER_REGSZ 16
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#define WD0_OFF 0
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#define WD1_OFF (WD_TIMER_REGSZ * 1)
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#define WD2_OFF (WD_TIMER_REGSZ * 2)
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#define PLD_OFF (WD_TIMER_REGSZ * 3)
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#define WD_DCNTR 0x00
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#define WD_LIMIT 0x04
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#define WD_STATUS 0x08
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#define PLD_IMASK (PLD_OFF + 0x00)
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#define PLD_STATUS (PLD_OFF + 0x04)
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static struct timer_list cpwd_timer;
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static int wd0_timeout = 0;
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static int wd1_timeout = 0;
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static int wd2_timeout = 0;
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module_param (wd0_timeout, int, 0);
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MODULE_PARM_DESC(wd0_timeout, "Default watchdog0 timeout in 1/10secs");
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module_param (wd1_timeout, int, 0);
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MODULE_PARM_DESC(wd1_timeout, "Default watchdog1 timeout in 1/10secs");
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module_param (wd2_timeout, int, 0);
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MODULE_PARM_DESC(wd2_timeout, "Default watchdog2 timeout in 1/10secs");
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MODULE_AUTHOR("Eric Brower <ebrower@usa.net>");
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MODULE_DESCRIPTION("Hardware watchdog driver for Sun Microsystems CP1400/1500");
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MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("watchdog");
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static void cpwd_writew(u16 val, void __iomem *addr)
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{
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writew(cpu_to_le16(val), addr);
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}
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static u16 cpwd_readw(void __iomem *addr)
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{
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u16 val = readw(addr);
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return le16_to_cpu(val);
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}
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static void cpwd_writeb(u8 val, void __iomem *addr)
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{
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writeb(val, addr);
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}
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static u8 cpwd_readb(void __iomem *addr)
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{
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return readb(addr);
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}
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/* Enable or disable watchdog interrupts
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* Because of the CP1400 defect this should only be
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* called during initialzation or by wd_[start|stop]timer()
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*
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* index - sub-device index, or -1 for 'all'
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* enable - non-zero to enable interrupts, zero to disable
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*/
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static void cpwd_toggleintr(struct cpwd *p, int index, int enable)
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{
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unsigned char curregs = cpwd_readb(p->regs + PLD_IMASK);
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unsigned char setregs =
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(index == -1) ?
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(WD0_INTR_MASK | WD1_INTR_MASK | WD2_INTR_MASK) :
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(p->devs[index].intr_mask);
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if (enable == WD_INTR_ON)
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curregs &= ~setregs;
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else
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curregs |= setregs;
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cpwd_writeb(curregs, p->regs + PLD_IMASK);
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}
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/* Restarts timer with maximum limit value and
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* does not unset 'brokenstop' value.
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*/
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static void cpwd_resetbrokentimer(struct cpwd *p, int index)
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{
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cpwd_toggleintr(p, index, WD_INTR_ON);
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cpwd_writew(WD_BLIMIT, p->devs[index].regs + WD_LIMIT);
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}
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/* Timer method called to reset stopped watchdogs--
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* because of the PLD bug on CP1400, we cannot mask
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* interrupts within the PLD so me must continually
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* reset the timers ad infinitum.
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*/
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static void cpwd_brokentimer(unsigned long data)
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{
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struct cpwd *p = (struct cpwd *) data;
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int id, tripped = 0;
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/* kill a running timer instance, in case we
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* were called directly instead of by kernel timer
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*/
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if (timer_pending(&cpwd_timer))
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del_timer(&cpwd_timer);
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for (id = 0; id < WD_NUMDEVS; id++) {
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if (p->devs[id].runstatus & WD_STAT_BSTOP) {
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++tripped;
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cpwd_resetbrokentimer(p, id);
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}
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}
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if (tripped) {
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/* there is at least one timer brokenstopped-- reschedule */
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cpwd_timer.expires = WD_BTIMEOUT;
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add_timer(&cpwd_timer);
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}
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}
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/* Reset countdown timer with 'limit' value and continue countdown.
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* This will not start a stopped timer.
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*/
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static void cpwd_pingtimer(struct cpwd *p, int index)
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{
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if (cpwd_readb(p->devs[index].regs + WD_STATUS) & WD_S_RUNNING)
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cpwd_readw(p->devs[index].regs + WD_DCNTR);
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}
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/* Stop a running watchdog timer-- the timer actually keeps
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* running, but the interrupt is masked so that no action is
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* taken upon expiration.
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*/
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static void cpwd_stoptimer(struct cpwd *p, int index)
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{
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if (cpwd_readb(p->devs[index].regs + WD_STATUS) & WD_S_RUNNING) {
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cpwd_toggleintr(p, index, WD_INTR_OFF);
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if (p->broken) {
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p->devs[index].runstatus |= WD_STAT_BSTOP;
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cpwd_brokentimer((unsigned long) p);
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}
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}
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}
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/* Start a watchdog timer with the specified limit value
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* If the watchdog is running, it will be restarted with
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* the provided limit value.
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*
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* This function will enable interrupts on the specified
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* watchdog.
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*/
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static void cpwd_starttimer(struct cpwd *p, int index)
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{
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if (p->broken)
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p->devs[index].runstatus &= ~WD_STAT_BSTOP;
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p->devs[index].runstatus &= ~WD_STAT_SVCD;
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cpwd_writew(p->devs[index].timeout, p->devs[index].regs + WD_LIMIT);
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cpwd_toggleintr(p, index, WD_INTR_ON);
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}
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static int cpwd_getstatus(struct cpwd *p, int index)
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{
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unsigned char stat = cpwd_readb(p->devs[index].regs + WD_STATUS);
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unsigned char intr = cpwd_readb(p->devs[index].regs + PLD_IMASK);
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unsigned char ret = WD_STOPPED;
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/* determine STOPPED */
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if (!stat)
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return ret;
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/* determine EXPIRED vs FREERUN vs RUNNING */
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else if (WD_S_EXPIRED & stat) {
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ret = WD_EXPIRED;
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} else if(WD_S_RUNNING & stat) {
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if (intr & p->devs[index].intr_mask) {
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ret = WD_FREERUN;
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} else {
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/* Fudge WD_EXPIRED status for defective CP1400--
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* IF timer is running
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* AND brokenstop is set
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* AND an interrupt has been serviced
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* we are WD_EXPIRED.
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*
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* IF timer is running
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* AND brokenstop is set
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* AND no interrupt has been serviced
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* we are WD_FREERUN.
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*/
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if (p->broken &&
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(p->devs[index].runstatus & WD_STAT_BSTOP)) {
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if (p->devs[index].runstatus & WD_STAT_SVCD) {
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ret = WD_EXPIRED;
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} else {
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/* we could as well pretend we are expired */
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ret = WD_FREERUN;
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}
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} else {
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ret = WD_RUNNING;
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}
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}
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}
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/* determine SERVICED */
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if (p->devs[index].runstatus & WD_STAT_SVCD)
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ret |= WD_SERVICED;
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return(ret);
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}
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static irqreturn_t cpwd_interrupt(int irq, void *dev_id)
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{
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struct cpwd *p = dev_id;
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/* Only WD0 will interrupt-- others are NMI and we won't
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* see them here....
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*/
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spin_lock_irq(&p->lock);
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cpwd_stoptimer(p, WD0_ID);
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p->devs[WD0_ID].runstatus |= WD_STAT_SVCD;
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spin_unlock_irq(&p->lock);
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return IRQ_HANDLED;
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}
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static int cpwd_open(struct inode *inode, struct file *f)
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{
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struct cpwd *p = cpwd_device;
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lock_kernel();
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switch(iminor(inode)) {
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case WD0_MINOR:
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case WD1_MINOR:
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case WD2_MINOR:
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break;
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default:
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unlock_kernel();
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return -ENODEV;
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}
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/* Register IRQ on first open of device */
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if (!p->initialized) {
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if (request_irq(p->irq, &cpwd_interrupt,
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IRQF_SHARED, DRIVER_NAME, p)) {
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printk(KERN_ERR PFX "Cannot register IRQ %d\n",
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p->irq);
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unlock_kernel();
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return -EBUSY;
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}
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p->initialized = true;
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}
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unlock_kernel();
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return nonseekable_open(inode, f);
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}
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static int cpwd_release(struct inode *inode, struct file *file)
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{
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return 0;
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}
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static int cpwd_ioctl(struct inode *inode, struct file *file,
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unsigned int cmd, unsigned long arg)
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{
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static struct watchdog_info info = {
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.options = WDIOF_SETTIMEOUT,
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.firmware_version = 1,
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.identity = DRIVER_NAME,
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};
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void __user *argp = (void __user *)arg;
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int index = iminor(inode) - WD0_MINOR;
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struct cpwd *p = cpwd_device;
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int setopt = 0;
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switch (cmd) {
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/* Generic Linux IOCTLs */
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &info, sizeof(struct watchdog_info)))
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return -EFAULT;
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break;
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case WDIOC_GETSTATUS:
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case WDIOC_GETBOOTSTATUS:
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if (put_user(0, (int __user *)argp))
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return -EFAULT;
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break;
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case WDIOC_KEEPALIVE:
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cpwd_pingtimer(p, index);
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break;
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case WDIOC_SETOPTIONS:
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if (copy_from_user(&setopt, argp, sizeof(unsigned int)))
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return -EFAULT;
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if (setopt & WDIOS_DISABLECARD) {
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if (p->enabled)
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return -EINVAL;
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cpwd_stoptimer(p, index);
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} else if (setopt & WDIOS_ENABLECARD) {
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cpwd_starttimer(p, index);
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} else {
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return -EINVAL;
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}
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break;
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/* Solaris-compatible IOCTLs */
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case WIOCGSTAT:
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setopt = cpwd_getstatus(p, index);
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if (copy_to_user(argp, &setopt, sizeof(unsigned int)))
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return -EFAULT;
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break;
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case WIOCSTART:
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cpwd_starttimer(p, index);
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break;
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case WIOCSTOP:
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if (p->enabled)
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return(-EINVAL);
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cpwd_stoptimer(p, index);
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static long cpwd_compat_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int rval = -ENOIOCTLCMD;
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switch (cmd) {
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/* solaris ioctls are specific to this driver */
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case WIOCSTART:
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case WIOCSTOP:
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case WIOCGSTAT:
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lock_kernel();
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rval = cpwd_ioctl(file->f_path.dentry->d_inode, file, cmd, arg);
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unlock_kernel();
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break;
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/* everything else is handled by the generic compat layer */
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default:
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break;
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}
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return rval;
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}
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static ssize_t cpwd_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 inode *inode = file->f_path.dentry->d_inode;
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struct cpwd *p = cpwd_device;
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int index = iminor(inode);
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if (count) {
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cpwd_pingtimer(p, index);
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return 1;
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}
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return 0;
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}
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static ssize_t cpwd_read(struct file * file, char __user *buffer,
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size_t count, loff_t *ppos)
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{
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return -EINVAL;
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}
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static const struct file_operations cpwd_fops = {
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.owner = THIS_MODULE,
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.ioctl = cpwd_ioctl,
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.compat_ioctl = cpwd_compat_ioctl,
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.open = cpwd_open,
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.write = cpwd_write,
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.read = cpwd_read,
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.release = cpwd_release,
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};
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static int __devinit cpwd_probe(struct of_device *op,
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const struct of_device_id *match)
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{
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struct device_node *options;
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const char *str_prop;
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const void *prop_val;
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int i, err = -EINVAL;
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struct cpwd *p;
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if (cpwd_device)
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return -EINVAL;
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p = kzalloc(sizeof(*p), GFP_KERNEL);
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err = -ENOMEM;
|
|
if (!p) {
|
|
printk(KERN_ERR PFX "Unable to allocate struct cpwd.\n");
|
|
goto out;
|
|
}
|
|
|
|
p->irq = op->irqs[0];
|
|
|
|
spin_lock_init(&p->lock);
|
|
|
|
p->regs = of_ioremap(&op->resource[0], 0,
|
|
4 * WD_TIMER_REGSZ, DRIVER_NAME);
|
|
if (!p->regs) {
|
|
printk(KERN_ERR PFX "Unable to map registers.\n");
|
|
goto out_free;
|
|
}
|
|
|
|
options = of_find_node_by_path("/options");
|
|
err = -ENODEV;
|
|
if (!options) {
|
|
printk(KERN_ERR PFX "Unable to find /options node.\n");
|
|
goto out_iounmap;
|
|
}
|
|
|
|
prop_val = of_get_property(options, "watchdog-enable?", NULL);
|
|
p->enabled = (prop_val ? true : false);
|
|
|
|
prop_val = of_get_property(options, "watchdog-reboot?", NULL);
|
|
p->reboot = (prop_val ? true : false);
|
|
|
|
str_prop = of_get_property(options, "watchdog-timeout", NULL);
|
|
if (str_prop)
|
|
p->timeout = simple_strtoul(str_prop, NULL, 10);
|
|
|
|
/* CP1400s seem to have broken PLD implementations-- the
|
|
* interrupt_mask register cannot be written, so no timer
|
|
* interrupts can be masked within the PLD.
|
|
*/
|
|
str_prop = of_get_property(op->node, "model", NULL);
|
|
p->broken = (str_prop && !strcmp(str_prop, WD_BADMODEL));
|
|
|
|
if (!p->enabled)
|
|
cpwd_toggleintr(p, -1, WD_INTR_OFF);
|
|
|
|
for (i = 0; i < WD_NUMDEVS; i++) {
|
|
static const char *cpwd_names[] = { "RIC", "XIR", "POR" };
|
|
static int *parms[] = { &wd0_timeout,
|
|
&wd1_timeout,
|
|
&wd2_timeout };
|
|
struct miscdevice *mp = &p->devs[i].misc;
|
|
|
|
mp->minor = WD0_MINOR + i;
|
|
mp->name = cpwd_names[i];
|
|
mp->fops = &cpwd_fops;
|
|
|
|
p->devs[i].regs = p->regs + (i * WD_TIMER_REGSZ);
|
|
p->devs[i].intr_mask = (WD0_INTR_MASK << i);
|
|
p->devs[i].runstatus &= ~WD_STAT_BSTOP;
|
|
p->devs[i].runstatus |= WD_STAT_INIT;
|
|
p->devs[i].timeout = p->timeout;
|
|
if (*parms[i])
|
|
p->devs[i].timeout = *parms[i];
|
|
|
|
err = misc_register(&p->devs[i].misc);
|
|
if (err) {
|
|
printk(KERN_ERR "Could not register misc device for "
|
|
"dev %d\n", i);
|
|
goto out_unregister;
|
|
}
|
|
}
|
|
|
|
if (p->broken) {
|
|
init_timer(&cpwd_timer);
|
|
cpwd_timer.function = cpwd_brokentimer;
|
|
cpwd_timer.data = (unsigned long) p;
|
|
cpwd_timer.expires = WD_BTIMEOUT;
|
|
|
|
printk(KERN_INFO PFX "PLD defect workaround enabled for "
|
|
"model " WD_BADMODEL ".\n");
|
|
}
|
|
|
|
dev_set_drvdata(&op->dev, p);
|
|
cpwd_device = p;
|
|
err = 0;
|
|
|
|
out:
|
|
return err;
|
|
|
|
out_unregister:
|
|
for (i--; i >= 0; i--)
|
|
misc_deregister(&p->devs[i].misc);
|
|
|
|
out_iounmap:
|
|
of_iounmap(&op->resource[0], p->regs, 4 * WD_TIMER_REGSZ);
|
|
|
|
out_free:
|
|
kfree(p);
|
|
goto out;
|
|
}
|
|
|
|
static int __devexit cpwd_remove(struct of_device *op)
|
|
{
|
|
struct cpwd *p = dev_get_drvdata(&op->dev);
|
|
int i;
|
|
|
|
for (i = 0; i < 4; i++) {
|
|
misc_deregister(&p->devs[i].misc);
|
|
|
|
if (!p->enabled) {
|
|
cpwd_stoptimer(p, i);
|
|
if (p->devs[i].runstatus & WD_STAT_BSTOP)
|
|
cpwd_resetbrokentimer(p, i);
|
|
}
|
|
}
|
|
|
|
if (p->broken)
|
|
del_timer_sync(&cpwd_timer);
|
|
|
|
if (p->initialized)
|
|
free_irq(p->irq, p);
|
|
|
|
of_iounmap(&op->resource[0], p->regs, 4 * WD_TIMER_REGSZ);
|
|
kfree(p);
|
|
|
|
cpwd_device = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id cpwd_match[] = {
|
|
{
|
|
.name = "watchdog",
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, cpwd_match);
|
|
|
|
static struct of_platform_driver cpwd_driver = {
|
|
.name = DRIVER_NAME,
|
|
.match_table = cpwd_match,
|
|
.probe = cpwd_probe,
|
|
.remove = __devexit_p(cpwd_remove),
|
|
};
|
|
|
|
static int __init cpwd_init(void)
|
|
{
|
|
return of_register_driver(&cpwd_driver, &of_bus_type);
|
|
}
|
|
|
|
static void __exit cpwd_exit(void)
|
|
{
|
|
of_unregister_driver(&cpwd_driver);
|
|
}
|
|
|
|
module_init(cpwd_init);
|
|
module_exit(cpwd_exit);
|