+++ /dev/null
-/*
- * Copyright IBM Corp. 2006
- * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
- */
-#ifndef __S390_ETR_H
-#define __S390_ETR_H
-
-/* ETR attachment control register */
-struct etr_eacr {
- unsigned int e0 : 1; /* port 0 stepping control */
- unsigned int e1 : 1; /* port 1 stepping control */
- unsigned int _pad0 : 5; /* must be 00100 */
- unsigned int dp : 1; /* data port control */
- unsigned int p0 : 1; /* port 0 change recognition control */
- unsigned int p1 : 1; /* port 1 change recognition control */
- unsigned int _pad1 : 3; /* must be 000 */
- unsigned int ea : 1; /* ETR alert control */
- unsigned int es : 1; /* ETR sync check control */
- unsigned int sl : 1; /* switch to local control */
-} __attribute__ ((packed));
-
-/* Port state returned by steai */
-enum etr_psc {
- etr_psc_operational = 0,
- etr_psc_semi_operational = 1,
- etr_psc_protocol_error = 4,
- etr_psc_no_symbols = 8,
- etr_psc_no_signal = 12,
- etr_psc_pps_mode = 13
-};
-
-/* Logical port state returned by stetr */
-enum etr_lpsc {
- etr_lpsc_operational_step = 0,
- etr_lpsc_operational_alt = 1,
- etr_lpsc_semi_operational = 2,
- etr_lpsc_protocol_error = 4,
- etr_lpsc_no_symbol_sync = 8,
- etr_lpsc_no_signal = 12,
- etr_lpsc_pps_mode = 13
-};
-
-/* ETR status words */
-struct etr_esw {
- struct etr_eacr eacr; /* attachment control register */
- unsigned int y : 1; /* stepping mode */
- unsigned int _pad0 : 5; /* must be 00000 */
- unsigned int p : 1; /* stepping port number */
- unsigned int q : 1; /* data port number */
- unsigned int psc0 : 4; /* port 0 state code */
- unsigned int psc1 : 4; /* port 1 state code */
-} __attribute__ ((packed));
-
-/* Second level data register status word */
-struct etr_slsw {
- unsigned int vv1 : 1; /* copy of validity bit data frame 1 */
- unsigned int vv2 : 1; /* copy of validity bit data frame 2 */
- unsigned int vv3 : 1; /* copy of validity bit data frame 3 */
- unsigned int vv4 : 1; /* copy of validity bit data frame 4 */
- unsigned int _pad0 : 19; /* must by all zeroes */
- unsigned int n : 1; /* EAF port number */
- unsigned int v1 : 1; /* validity bit ETR data frame 1 */
- unsigned int v2 : 1; /* validity bit ETR data frame 2 */
- unsigned int v3 : 1; /* validity bit ETR data frame 3 */
- unsigned int v4 : 1; /* validity bit ETR data frame 4 */
- unsigned int _pad1 : 4; /* must be 0000 */
-} __attribute__ ((packed));
-
-/* ETR data frames */
-struct etr_edf1 {
- unsigned int u : 1; /* untuned bit */
- unsigned int _pad0 : 1; /* must be 0 */
- unsigned int r : 1; /* service request bit */
- unsigned int _pad1 : 4; /* must be 0000 */
- unsigned int a : 1; /* time adjustment bit */
- unsigned int net_id : 8; /* ETR network id */
- unsigned int etr_id : 8; /* id of ETR which sends data frames */
- unsigned int etr_pn : 8; /* port number of ETR output port */
-} __attribute__ ((packed));
-
-struct etr_edf2 {
- unsigned int etv : 32; /* Upper 32 bits of TOD. */
-} __attribute__ ((packed));
-
-struct etr_edf3 {
- unsigned int rc : 8; /* failure reason code */
- unsigned int _pad0 : 3; /* must be 000 */
- unsigned int c : 1; /* ETR coupled bit */
- unsigned int tc : 4; /* ETR type code */
- unsigned int blto : 8; /* biased local time offset */
- /* (blto - 128) * 15 = minutes */
- unsigned int buo : 8; /* biased utc offset */
- /* (buo - 128) = leap seconds */
-} __attribute__ ((packed));
-
-struct etr_edf4 {
- unsigned int ed : 8; /* ETS device dependent data */
- unsigned int _pad0 : 1; /* must be 0 */
- unsigned int buc : 5; /* biased ut1 correction */
- /* (buc - 16) * 0.1 seconds */
- unsigned int em : 6; /* ETS error magnitude */
- unsigned int dc : 6; /* ETS drift code */
- unsigned int sc : 6; /* ETS steering code */
-} __attribute__ ((packed));
-
-/*
- * ETR attachment information block, two formats
- * format 1 has 4 reserved words with a size of 64 bytes
- * format 2 has 16 reserved words with a size of 96 bytes
- */
-struct etr_aib {
- struct etr_esw esw;
- struct etr_slsw slsw;
- unsigned long long tsp;
- struct etr_edf1 edf1;
- struct etr_edf2 edf2;
- struct etr_edf3 edf3;
- struct etr_edf4 edf4;
- unsigned int reserved[16];
-} __attribute__ ((packed,aligned(8)));
-
-/* ETR interruption parameter */
-struct etr_irq_parm {
- unsigned int _pad0 : 8;
- unsigned int pc0 : 1; /* port 0 state change */
- unsigned int pc1 : 1; /* port 1 state change */
- unsigned int _pad1 : 3;
- unsigned int eai : 1; /* ETR alert indication */
- unsigned int _pad2 : 18;
-} __attribute__ ((packed));
-
-/* Inline assembly helper functions */
-static inline int etr_setr(struct etr_eacr *ctrl)
-{
- int rc = -EOPNOTSUPP;
-
- asm volatile(
- " .insn s,0xb2160000,%1\n"
- "0: la %0,0\n"
- "1:\n"
- EX_TABLE(0b,1b)
- : "+d" (rc) : "Q" (*ctrl));
- return rc;
-}
-
-/* Stores a format 1 aib with 64 bytes */
-static inline int etr_stetr(struct etr_aib *aib)
-{
- int rc = -EOPNOTSUPP;
-
- asm volatile(
- " .insn s,0xb2170000,%1\n"
- "0: la %0,0\n"
- "1:\n"
- EX_TABLE(0b,1b)
- : "+d" (rc) : "Q" (*aib));
- return rc;
-}
-
-/* Stores a format 2 aib with 96 bytes for specified port */
-static inline int etr_steai(struct etr_aib *aib, unsigned int func)
-{
- register unsigned int reg0 asm("0") = func;
- int rc = -EOPNOTSUPP;
-
- asm volatile(
- " .insn s,0xb2b30000,%1\n"
- "0: la %0,0\n"
- "1:\n"
- EX_TABLE(0b,1b)
- : "+d" (rc) : "Q" (*aib), "d" (reg0));
- return rc;
-}
-
-/* Function codes for the steai instruction. */
-#define ETR_STEAI_STEPPING_PORT 0x10
-#define ETR_STEAI_ALTERNATE_PORT 0x11
-#define ETR_STEAI_PORT_0 0x12
-#define ETR_STEAI_PORT_1 0x13
-
-/* Functions needed by the machine check handler */
-int etr_switch_to_local(void);
-int etr_sync_check(void);
-void etr_queue_work(void);
-
-/* notifier for syncs */
-extern struct atomic_notifier_head s390_epoch_delta_notifier;
-
-/* STP interruption parameter */
-struct stp_irq_parm {
- unsigned int _pad0 : 14;
- unsigned int tsc : 1; /* Timing status change */
- unsigned int lac : 1; /* Link availability change */
- unsigned int tcpc : 1; /* Time control parameter change */
- unsigned int _pad2 : 15;
-} __attribute__ ((packed));
-
-#define STP_OP_SYNC 1
-#define STP_OP_CTRL 3
-
-struct stp_sstpi {
- unsigned int rsvd0;
- unsigned int rsvd1 : 8;
- unsigned int stratum : 8;
- unsigned int vbits : 16;
- unsigned int leaps : 16;
- unsigned int tmd : 4;
- unsigned int ctn : 4;
- unsigned int rsvd2 : 3;
- unsigned int c : 1;
- unsigned int tst : 4;
- unsigned int tzo : 16;
- unsigned int dsto : 16;
- unsigned int ctrl : 16;
- unsigned int rsvd3 : 16;
- unsigned int tto;
- unsigned int rsvd4;
- unsigned int ctnid[3];
- unsigned int rsvd5;
- unsigned int todoff[4];
- unsigned int rsvd6[48];
-} __attribute__ ((packed));
-
-/* Functions needed by the machine check handler */
-int stp_sync_check(void);
-int stp_island_check(void);
-void stp_queue_work(void);
-
-#endif /* __S390_ETR_H */
#include <asm/irq.h>
#include <asm/irq_regs.h>
#include <asm/vtimer.h>
-#include <asm/etr.h>
+#include <asm/stp.h>
#include <asm/cio.h>
#include "entry.h"
set_clock_comparator(S390_lowcore.clock_comparator);
}
-static void etr_timing_alert(struct etr_irq_parm *);
static void stp_timing_alert(struct stp_irq_parm *);
static void timing_alert_interrupt(struct ext_code ext_code,
unsigned int param32, unsigned long param64)
{
inc_irq_stat(IRQEXT_TLA);
- if (param32 & 0x00c40000)
- etr_timing_alert((struct etr_irq_parm *) ¶m32);
if (param32 & 0x00038000)
stp_timing_alert((struct stp_irq_parm *) ¶m32);
}
-static void etr_reset(void);
static void stp_reset(void);
void read_persistent_clock64(struct timespec64 *ts)
void __init time_init(void)
{
/* Reset time synchronization interfaces. */
- etr_reset();
stp_reset();
/* request the clock comparator external interrupt */
time_sync_wq = create_singlethread_workqueue("timesync");
}
-/*
- * External Time Reference (ETR) code.
- */
-static int etr_port0_online;
-static int etr_port1_online;
-static int etr_steai_available;
-
-static int __init early_parse_etr(char *p)
-{
- if (strncmp(p, "off", 3) == 0)
- etr_port0_online = etr_port1_online = 0;
- else if (strncmp(p, "port0", 5) == 0)
- etr_port0_online = 1;
- else if (strncmp(p, "port1", 5) == 0)
- etr_port1_online = 1;
- else if (strncmp(p, "on", 2) == 0)
- etr_port0_online = etr_port1_online = 1;
- return 0;
-}
-early_param("etr", early_parse_etr);
-
-enum etr_event {
- ETR_EVENT_PORT0_CHANGE,
- ETR_EVENT_PORT1_CHANGE,
- ETR_EVENT_PORT_ALERT,
- ETR_EVENT_SYNC_CHECK,
- ETR_EVENT_SWITCH_LOCAL,
- ETR_EVENT_UPDATE,
-};
-
-/*
- * Valid bit combinations of the eacr register are (x = don't care):
- * e0 e1 dp p0 p1 ea es sl
- * 0 0 x 0 0 0 0 0 initial, disabled state
- * 0 0 x 0 1 1 0 0 port 1 online
- * 0 0 x 1 0 1 0 0 port 0 online
- * 0 0 x 1 1 1 0 0 both ports online
- * 0 1 x 0 1 1 0 0 port 1 online and usable, ETR or PPS mode
- * 0 1 x 0 1 1 0 1 port 1 online, usable and ETR mode
- * 0 1 x 0 1 1 1 0 port 1 online, usable, PPS mode, in-sync
- * 0 1 x 0 1 1 1 1 port 1 online, usable, ETR mode, in-sync
- * 0 1 x 1 1 1 0 0 both ports online, port 1 usable
- * 0 1 x 1 1 1 1 0 both ports online, port 1 usable, PPS mode, in-sync
- * 0 1 x 1 1 1 1 1 both ports online, port 1 usable, ETR mode, in-sync
- * 1 0 x 1 0 1 0 0 port 0 online and usable, ETR or PPS mode
- * 1 0 x 1 0 1 0 1 port 0 online, usable and ETR mode
- * 1 0 x 1 0 1 1 0 port 0 online, usable, PPS mode, in-sync
- * 1 0 x 1 0 1 1 1 port 0 online, usable, ETR mode, in-sync
- * 1 0 x 1 1 1 0 0 both ports online, port 0 usable
- * 1 0 x 1 1 1 1 0 both ports online, port 0 usable, PPS mode, in-sync
- * 1 0 x 1 1 1 1 1 both ports online, port 0 usable, ETR mode, in-sync
- * 1 1 x 1 1 1 1 0 both ports online & usable, ETR, in-sync
- * 1 1 x 1 1 1 1 1 both ports online & usable, ETR, in-sync
- */
-static struct etr_eacr etr_eacr;
-static u64 etr_tolec; /* time of last eacr update */
-static struct etr_aib etr_port0;
-static int etr_port0_uptodate;
-static struct etr_aib etr_port1;
-static int etr_port1_uptodate;
-static unsigned long etr_events;
-static struct timer_list etr_timer;
-
-static void etr_timeout(unsigned long dummy);
-static void etr_work_fn(struct work_struct *work);
-static DEFINE_MUTEX(etr_work_mutex);
-static DECLARE_WORK(etr_work, etr_work_fn);
-
-/*
- * Reset ETR attachment.
- */
-static void etr_reset(void)
-{
- etr_eacr = (struct etr_eacr) {
- .e0 = 0, .e1 = 0, ._pad0 = 4, .dp = 0,
- .p0 = 0, .p1 = 0, ._pad1 = 0, .ea = 0,
- .es = 0, .sl = 0 };
- if (etr_setr(&etr_eacr) == 0) {
- etr_tolec = get_tod_clock();
- set_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags);
- if (etr_port0_online && etr_port1_online)
- set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
- } else if (etr_port0_online || etr_port1_online) {
- pr_warn("The real or virtual hardware system does not provide an ETR interface\n");
- etr_port0_online = etr_port1_online = 0;
- }
-}
-
-static int __init etr_init(void)
-{
- struct etr_aib aib;
-
- if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
- return 0;
- time_init_wq();
- /* Check if this machine has the steai instruction. */
- if (etr_steai(&aib, ETR_STEAI_STEPPING_PORT) == 0)
- etr_steai_available = 1;
- setup_timer(&etr_timer, etr_timeout, 0UL);
- if (etr_port0_online) {
- set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
- queue_work(time_sync_wq, &etr_work);
- }
- if (etr_port1_online) {
- set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
- queue_work(time_sync_wq, &etr_work);
- }
- return 0;
-}
-
-arch_initcall(etr_init);
-
-/*
- * Two sorts of ETR machine checks. The architecture reads:
- * "When a machine-check niterruption occurs and if a switch-to-local or
- * ETR-sync-check interrupt request is pending but disabled, this pending
- * disabled interruption request is indicated and is cleared".
- * Which means that we can get etr_switch_to_local events from the machine
- * check handler although the interruption condition is disabled. Lovely..
- */
-
-/*
- * Switch to local machine check. This is called when the last usable
- * ETR port goes inactive. After switch to local the clock is not in sync.
- */
-int etr_switch_to_local(void)
-{
- if (!etr_eacr.sl)
- return 0;
- disable_sync_clock(NULL);
- if (!test_and_set_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events)) {
- etr_eacr.es = etr_eacr.sl = 0;
- etr_setr(&etr_eacr);
- return 1;
- }
- return 0;
-}
-
-/*
- * ETR sync check machine check. This is called when the ETR OTE and the
- * local clock OTE are farther apart than the ETR sync check tolerance.
- * After a ETR sync check the clock is not in sync. The machine check
- * is broadcasted to all cpus at the same time.
- */
-int etr_sync_check(void)
-{
- if (!etr_eacr.es)
- return 0;
- disable_sync_clock(NULL);
- if (!test_and_set_bit(ETR_EVENT_SYNC_CHECK, &etr_events)) {
- etr_eacr.es = 0;
- etr_setr(&etr_eacr);
- return 1;
- }
- return 0;
-}
-
-void etr_queue_work(void)
-{
- queue_work(time_sync_wq, &etr_work);
-}
-
-/*
- * ETR timing alert. There are two causes:
- * 1) port state change, check the usability of the port
- * 2) port alert, one of the ETR-data-validity bits (v1-v2 bits of the
- * sldr-status word) or ETR-data word 1 (edf1) or ETR-data word 3 (edf3)
- * or ETR-data word 4 (edf4) has changed.
- */
-static void etr_timing_alert(struct etr_irq_parm *intparm)
-{
- if (intparm->pc0)
- /* ETR port 0 state change. */
- set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
- if (intparm->pc1)
- /* ETR port 1 state change. */
- set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
- if (intparm->eai)
- /*
- * ETR port alert on either port 0, 1 or both.
- * Both ports are not up-to-date now.
- */
- set_bit(ETR_EVENT_PORT_ALERT, &etr_events);
- queue_work(time_sync_wq, &etr_work);
-}
-
-static void etr_timeout(unsigned long dummy)
-{
- set_bit(ETR_EVENT_UPDATE, &etr_events);
- queue_work(time_sync_wq, &etr_work);
-}
-
-/*
- * Check if the etr mode is pss.
- */
-static inline int etr_mode_is_pps(struct etr_eacr eacr)
-{
- return eacr.es && !eacr.sl;
-}
-
-/*
- * Check if the etr mode is etr.
- */
-static inline int etr_mode_is_etr(struct etr_eacr eacr)
-{
- return eacr.es && eacr.sl;
-}
-
-/*
- * Check if the port can be used for TOD synchronization.
- * For PPS mode the port has to receive OTEs. For ETR mode
- * the port has to receive OTEs, the ETR stepping bit has to
- * be zero and the validity bits for data frame 1, 2, and 3
- * have to be 1.
- */
-static int etr_port_valid(struct etr_aib *aib, int port)
-{
- unsigned int psc;
-
- /* Check that this port is receiving OTEs. */
- if (aib->tsp == 0)
- return 0;
-
- psc = port ? aib->esw.psc1 : aib->esw.psc0;
- if (psc == etr_lpsc_pps_mode)
- return 1;
- if (psc == etr_lpsc_operational_step)
- return !aib->esw.y && aib->slsw.v1 &&
- aib->slsw.v2 && aib->slsw.v3;
- return 0;
-}
-
-/*
- * Check if two ports are on the same network.
- */
-static int etr_compare_network(struct etr_aib *aib1, struct etr_aib *aib2)
-{
- // FIXME: any other fields we have to compare?
- return aib1->edf1.net_id == aib2->edf1.net_id;
-}
-
-/*
- * Wrapper for etr_stei that converts physical port states
- * to logical port states to be consistent with the output
- * of stetr (see etr_psc vs. etr_lpsc).
- */
-static void etr_steai_cv(struct etr_aib *aib, unsigned int func)
-{
- BUG_ON(etr_steai(aib, func) != 0);
- /* Convert port state to logical port state. */
- if (aib->esw.psc0 == 1)
- aib->esw.psc0 = 2;
- else if (aib->esw.psc0 == 0 && aib->esw.p == 0)
- aib->esw.psc0 = 1;
- if (aib->esw.psc1 == 1)
- aib->esw.psc1 = 2;
- else if (aib->esw.psc1 == 0 && aib->esw.p == 1)
- aib->esw.psc1 = 1;
-}
-
-/*
- * Check if the aib a2 is still connected to the same attachment as
- * aib a1, the etv values differ by one and a2 is valid.
- */
-static int etr_aib_follows(struct etr_aib *a1, struct etr_aib *a2, int p)
-{
- int state_a1, state_a2;
-
- /* Paranoia check: e0/e1 should better be the same. */
- if (a1->esw.eacr.e0 != a2->esw.eacr.e0 ||
- a1->esw.eacr.e1 != a2->esw.eacr.e1)
- return 0;
-
- /* Still connected to the same etr ? */
- state_a1 = p ? a1->esw.psc1 : a1->esw.psc0;
- state_a2 = p ? a2->esw.psc1 : a2->esw.psc0;
- if (state_a1 == etr_lpsc_operational_step) {
- if (state_a2 != etr_lpsc_operational_step ||
- a1->edf1.net_id != a2->edf1.net_id ||
- a1->edf1.etr_id != a2->edf1.etr_id ||
- a1->edf1.etr_pn != a2->edf1.etr_pn)
- return 0;
- } else if (state_a2 != etr_lpsc_pps_mode)
- return 0;
-
- /* The ETV value of a2 needs to be ETV of a1 + 1. */
- if (a1->edf2.etv + 1 != a2->edf2.etv)
- return 0;
-
- if (!etr_port_valid(a2, p))
- return 0;
-
- return 1;
-}
-
struct clock_sync_data {
atomic_t cpus;
int in_sync;
fixup_clock_comparator(sync->fixup_cc);
}
-/*
- * Sync the TOD clock using the port referred to by aibp. This port
- * has to be enabled and the other port has to be disabled. The
- * last eacr update has to be more than 1.6 seconds in the past.
- */
-static int etr_sync_clock(void *data)
-{
- static int first;
- unsigned long long clock, old_clock, clock_delta, delay, delta;
- struct clock_sync_data *etr_sync;
- struct etr_aib *sync_port, *aib;
- struct ptff_qto qto;
- int port;
- int rc;
-
- etr_sync = data;
-
- if (xchg(&first, 1) == 1) {
- /* Slave */
- clock_sync_cpu(etr_sync);
- return 0;
- }
-
- /* Wait until all other cpus entered the sync function. */
- while (atomic_read(&etr_sync->cpus) != 0)
- cpu_relax();
-
- port = etr_sync->etr_port;
- aib = etr_sync->etr_aib;
- sync_port = (port == 0) ? &etr_port0 : &etr_port1;
- enable_sync_clock();
-
- /* Set clock to next OTE. */
- __ctl_set_bit(14, 21);
- __ctl_set_bit(0, 29);
- clock = ((unsigned long long) (aib->edf2.etv + 1)) << 32;
- old_clock = get_tod_clock();
- if (set_tod_clock(clock) == 0) {
- __udelay(1); /* Wait for the clock to start. */
- __ctl_clear_bit(0, 29);
- __ctl_clear_bit(14, 21);
- etr_stetr(aib);
- /* Adjust Linux timing variables. */
- delay = (unsigned long long)
- (aib->edf2.etv - sync_port->edf2.etv) << 32;
- delta = adjust_time(old_clock, clock, delay);
- clock_delta = clock - old_clock;
- atomic_notifier_call_chain(&s390_epoch_delta_notifier, 0,
- &clock_delta);
- etr_sync->fixup_cc = delta;
- fixup_clock_comparator(delta);
- /* Verify that the clock is properly set. */
- if (!etr_aib_follows(sync_port, aib, port)) {
- /* Didn't work. */
- disable_sync_clock(NULL);
- etr_sync->in_sync = -EAGAIN;
- rc = -EAGAIN;
- } else {
- if (ptff_query(PTFF_QTO) &&
- ptff(&qto, sizeof(qto), PTFF_QTO) == 0)
- /* Update LPAR offset */
- lpar_offset = qto.tod_epoch_difference;
- etr_sync->in_sync = 1;
- rc = 0;
- }
- } else {
- /* Could not set the clock ?!? */
- __ctl_clear_bit(0, 29);
- __ctl_clear_bit(14, 21);
- disable_sync_clock(NULL);
- etr_sync->in_sync = -EAGAIN;
- rc = -EAGAIN;
- }
- xchg(&first, 0);
- return rc;
-}
-
-static int etr_sync_clock_stop(struct etr_aib *aib, int port)
-{
- struct clock_sync_data etr_sync;
- struct etr_aib *sync_port;
- int follows;
- int rc;
-
- /* Check if the current aib is adjacent to the sync port aib. */
- sync_port = (port == 0) ? &etr_port0 : &etr_port1;
- follows = etr_aib_follows(sync_port, aib, port);
- memcpy(sync_port, aib, sizeof(*aib));
- if (!follows)
- return -EAGAIN;
- memset(&etr_sync, 0, sizeof(etr_sync));
- etr_sync.etr_aib = aib;
- etr_sync.etr_port = port;
- get_online_cpus();
- atomic_set(&etr_sync.cpus, num_online_cpus() - 1);
- rc = stop_machine(etr_sync_clock, &etr_sync, cpu_online_mask);
- put_online_cpus();
- return rc;
-}
-
-/*
- * Handle the immediate effects of the different events.
- * The port change event is used for online/offline changes.
- */
-static struct etr_eacr etr_handle_events(struct etr_eacr eacr)
-{
- if (test_and_clear_bit(ETR_EVENT_SYNC_CHECK, &etr_events))
- eacr.es = 0;
- if (test_and_clear_bit(ETR_EVENT_SWITCH_LOCAL, &etr_events))
- eacr.es = eacr.sl = 0;
- if (test_and_clear_bit(ETR_EVENT_PORT_ALERT, &etr_events))
- etr_port0_uptodate = etr_port1_uptodate = 0;
-
- if (test_and_clear_bit(ETR_EVENT_PORT0_CHANGE, &etr_events)) {
- if (eacr.e0)
- /*
- * Port change of an enabled port. We have to
- * assume that this can have caused an stepping
- * port switch.
- */
- etr_tolec = get_tod_clock();
- eacr.p0 = etr_port0_online;
- if (!eacr.p0)
- eacr.e0 = 0;
- etr_port0_uptodate = 0;
- }
- if (test_and_clear_bit(ETR_EVENT_PORT1_CHANGE, &etr_events)) {
- if (eacr.e1)
- /*
- * Port change of an enabled port. We have to
- * assume that this can have caused an stepping
- * port switch.
- */
- etr_tolec = get_tod_clock();
- eacr.p1 = etr_port1_online;
- if (!eacr.p1)
- eacr.e1 = 0;
- etr_port1_uptodate = 0;
- }
- clear_bit(ETR_EVENT_UPDATE, &etr_events);
- return eacr;
-}
-
-/*
- * Set up a timer that expires after the etr_tolec + 1.6 seconds if
- * one of the ports needs an update.
- */
-static void etr_set_tolec_timeout(unsigned long long now)
-{
- unsigned long micros;
-
- if ((!etr_eacr.p0 || etr_port0_uptodate) &&
- (!etr_eacr.p1 || etr_port1_uptodate))
- return;
- micros = (now > etr_tolec) ? ((now - etr_tolec) >> 12) : 0;
- micros = (micros > 1600000) ? 0 : 1600000 - micros;
- mod_timer(&etr_timer, jiffies + (micros * HZ) / 1000000 + 1);
-}
-
-/*
- * Set up a time that expires after 1/2 second.
- */
-static void etr_set_sync_timeout(void)
-{
- mod_timer(&etr_timer, jiffies + HZ/2);
-}
-
-/*
- * Update the aib information for one or both ports.
- */
-static struct etr_eacr etr_handle_update(struct etr_aib *aib,
- struct etr_eacr eacr)
-{
- /* With both ports disabled the aib information is useless. */
- if (!eacr.e0 && !eacr.e1)
- return eacr;
-
- /* Update port0 or port1 with aib stored in etr_work_fn. */
- if (aib->esw.q == 0) {
- /* Information for port 0 stored. */
- if (eacr.p0 && !etr_port0_uptodate) {
- etr_port0 = *aib;
- if (etr_port0_online)
- etr_port0_uptodate = 1;
- }
- } else {
- /* Information for port 1 stored. */
- if (eacr.p1 && !etr_port1_uptodate) {
- etr_port1 = *aib;
- if (etr_port0_online)
- etr_port1_uptodate = 1;
- }
- }
-
- /*
- * Do not try to get the alternate port aib if the clock
- * is not in sync yet.
- */
- if (!eacr.es || !check_sync_clock())
- return eacr;
-
- /*
- * If steai is available we can get the information about
- * the other port immediately. If only stetr is available the
- * data-port bit toggle has to be used.
- */
- if (etr_steai_available) {
- if (eacr.p0 && !etr_port0_uptodate) {
- etr_steai_cv(&etr_port0, ETR_STEAI_PORT_0);
- etr_port0_uptodate = 1;
- }
- if (eacr.p1 && !etr_port1_uptodate) {
- etr_steai_cv(&etr_port1, ETR_STEAI_PORT_1);
- etr_port1_uptodate = 1;
- }
- } else {
- /*
- * One port was updated above, if the other
- * port is not uptodate toggle dp bit.
- */
- if ((eacr.p0 && !etr_port0_uptodate) ||
- (eacr.p1 && !etr_port1_uptodate))
- eacr.dp ^= 1;
- else
- eacr.dp = 0;
- }
- return eacr;
-}
-
-/*
- * Write new etr control register if it differs from the current one.
- * Return 1 if etr_tolec has been updated as well.
- */
-static void etr_update_eacr(struct etr_eacr eacr)
-{
- int dp_changed;
-
- if (memcmp(&etr_eacr, &eacr, sizeof(eacr)) == 0)
- /* No change, return. */
- return;
- /*
- * The disable of an active port of the change of the data port
- * bit can/will cause a change in the data port.
- */
- dp_changed = etr_eacr.e0 > eacr.e0 || etr_eacr.e1 > eacr.e1 ||
- (etr_eacr.dp ^ eacr.dp) != 0;
- etr_eacr = eacr;
- etr_setr(&etr_eacr);
- if (dp_changed)
- etr_tolec = get_tod_clock();
-}
-
-/*
- * ETR work. In this function you'll find the main logic. In
- * particular this is the only function that calls etr_update_eacr(),
- * it "controls" the etr control register.
- */
-static void etr_work_fn(struct work_struct *work)
-{
- unsigned long long now;
- struct etr_eacr eacr;
- struct etr_aib aib;
- int sync_port;
-
- /* prevent multiple execution. */
- mutex_lock(&etr_work_mutex);
-
- /* Create working copy of etr_eacr. */
- eacr = etr_eacr;
-
- /* Check for the different events and their immediate effects. */
- eacr = etr_handle_events(eacr);
-
- /* Check if ETR is supposed to be active. */
- eacr.ea = eacr.p0 || eacr.p1;
- if (!eacr.ea) {
- /* Both ports offline. Reset everything. */
- eacr.dp = eacr.es = eacr.sl = 0;
- on_each_cpu(disable_sync_clock, NULL, 1);
- del_timer_sync(&etr_timer);
- etr_update_eacr(eacr);
- goto out_unlock;
- }
-
- /* Store aib to get the current ETR status word. */
- BUG_ON(etr_stetr(&aib) != 0);
- etr_port0.esw = etr_port1.esw = aib.esw; /* Copy status word. */
- now = get_tod_clock();
-
- /*
- * Update the port information if the last stepping port change
- * or data port change is older than 1.6 seconds.
- */
- if (now >= etr_tolec + (1600000 << 12))
- eacr = etr_handle_update(&aib, eacr);
-
- /*
- * Select ports to enable. The preferred synchronization mode is PPS.
- * If a port can be enabled depends on a number of things:
- * 1) The port needs to be online and uptodate. A port is not
- * disabled just because it is not uptodate, but it is only
- * enabled if it is uptodate.
- * 2) The port needs to have the same mode (pps / etr).
- * 3) The port needs to be usable -> etr_port_valid() == 1
- * 4) To enable the second port the clock needs to be in sync.
- * 5) If both ports are useable and are ETR ports, the network id
- * has to be the same.
- * The eacr.sl bit is used to indicate etr mode vs. pps mode.
- */
- if (eacr.p0 && aib.esw.psc0 == etr_lpsc_pps_mode) {
- eacr.sl = 0;
- eacr.e0 = 1;
- if (!etr_mode_is_pps(etr_eacr))
- eacr.es = 0;
- if (!eacr.es || !eacr.p1 || aib.esw.psc1 != etr_lpsc_pps_mode)
- eacr.e1 = 0;
- // FIXME: uptodate checks ?
- else if (etr_port0_uptodate && etr_port1_uptodate)
- eacr.e1 = 1;
- sync_port = (etr_port0_uptodate &&
- etr_port_valid(&etr_port0, 0)) ? 0 : -1;
- } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_pps_mode) {
- eacr.sl = 0;
- eacr.e0 = 0;
- eacr.e1 = 1;
- if (!etr_mode_is_pps(etr_eacr))
- eacr.es = 0;
- sync_port = (etr_port1_uptodate &&
- etr_port_valid(&etr_port1, 1)) ? 1 : -1;
- } else if (eacr.p0 && aib.esw.psc0 == etr_lpsc_operational_step) {
- eacr.sl = 1;
- eacr.e0 = 1;
- if (!etr_mode_is_etr(etr_eacr))
- eacr.es = 0;
- if (!eacr.es || !eacr.p1 ||
- aib.esw.psc1 != etr_lpsc_operational_alt)
- eacr.e1 = 0;
- else if (etr_port0_uptodate && etr_port1_uptodate &&
- etr_compare_network(&etr_port0, &etr_port1))
- eacr.e1 = 1;
- sync_port = (etr_port0_uptodate &&
- etr_port_valid(&etr_port0, 0)) ? 0 : -1;
- } else if (eacr.p1 && aib.esw.psc1 == etr_lpsc_operational_step) {
- eacr.sl = 1;
- eacr.e0 = 0;
- eacr.e1 = 1;
- if (!etr_mode_is_etr(etr_eacr))
- eacr.es = 0;
- sync_port = (etr_port1_uptodate &&
- etr_port_valid(&etr_port1, 1)) ? 1 : -1;
- } else {
- /* Both ports not usable. */
- eacr.es = eacr.sl = 0;
- sync_port = -1;
- }
-
- /*
- * If the clock is in sync just update the eacr and return.
- * If there is no valid sync port wait for a port update.
- */
- if ((eacr.es && check_sync_clock()) || sync_port < 0) {
- etr_update_eacr(eacr);
- etr_set_tolec_timeout(now);
- goto out_unlock;
- }
-
- /*
- * Prepare control register for clock syncing
- * (reset data port bit, set sync check control.
- */
- eacr.dp = 0;
- eacr.es = 1;
-
- /*
- * Update eacr and try to synchronize the clock. If the update
- * of eacr caused a stepping port switch (or if we have to
- * assume that a stepping port switch has occurred) or the
- * clock syncing failed, reset the sync check control bit
- * and set up a timer to try again after 0.5 seconds
- */
- etr_update_eacr(eacr);
- if (now < etr_tolec + (1600000 << 12) ||
- etr_sync_clock_stop(&aib, sync_port) != 0) {
- /* Sync failed. Try again in 1/2 second. */
- eacr.es = 0;
- etr_update_eacr(eacr);
- etr_set_sync_timeout();
- } else
- etr_set_tolec_timeout(now);
-out_unlock:
- mutex_unlock(&etr_work_mutex);
-}
-
-/*
- * Sysfs interface functions
- */
-static struct bus_type etr_subsys = {
- .name = "etr",
- .dev_name = "etr",
-};
-
-static struct device etr_port0_dev = {
- .id = 0,
- .bus = &etr_subsys,
-};
-
-static struct device etr_port1_dev = {
- .id = 1,
- .bus = &etr_subsys,
-};
-
-/*
- * ETR subsys attributes
- */
-static ssize_t etr_stepping_port_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%i\n", etr_port0.esw.p);
-}
-
-static DEVICE_ATTR(stepping_port, 0400, etr_stepping_port_show, NULL);
-
-static ssize_t etr_stepping_mode_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- char *mode_str;
-
- if (etr_mode_is_pps(etr_eacr))
- mode_str = "pps";
- else if (etr_mode_is_etr(etr_eacr))
- mode_str = "etr";
- else
- mode_str = "local";
- return sprintf(buf, "%s\n", mode_str);
-}
-
-static DEVICE_ATTR(stepping_mode, 0400, etr_stepping_mode_show, NULL);
-
-/*
- * ETR port attributes
- */
-static inline struct etr_aib *etr_aib_from_dev(struct device *dev)
-{
- if (dev == &etr_port0_dev)
- return etr_port0_online ? &etr_port0 : NULL;
- else
- return etr_port1_online ? &etr_port1 : NULL;
-}
-
-static ssize_t etr_online_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- unsigned int online;
-
- online = (dev == &etr_port0_dev) ? etr_port0_online : etr_port1_online;
- return sprintf(buf, "%i\n", online);
-}
-
-static ssize_t etr_online_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
-{
- unsigned int value;
-
- value = simple_strtoul(buf, NULL, 0);
- if (value != 0 && value != 1)
- return -EINVAL;
- if (!test_bit(CLOCK_SYNC_HAS_ETR, &clock_sync_flags))
- return -EOPNOTSUPP;
- mutex_lock(&clock_sync_mutex);
- if (dev == &etr_port0_dev) {
- if (etr_port0_online == value)
- goto out; /* Nothing to do. */
- etr_port0_online = value;
- if (etr_port0_online && etr_port1_online)
- set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
- else
- clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
- set_bit(ETR_EVENT_PORT0_CHANGE, &etr_events);
- queue_work(time_sync_wq, &etr_work);
- } else {
- if (etr_port1_online == value)
- goto out; /* Nothing to do. */
- etr_port1_online = value;
- if (etr_port0_online && etr_port1_online)
- set_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
- else
- clear_bit(CLOCK_SYNC_ETR, &clock_sync_flags);
- set_bit(ETR_EVENT_PORT1_CHANGE, &etr_events);
- queue_work(time_sync_wq, &etr_work);
- }
-out:
- mutex_unlock(&clock_sync_mutex);
- return count;
-}
-
-static DEVICE_ATTR(online, 0600, etr_online_show, etr_online_store);
-
-static ssize_t etr_stepping_control_show(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
- etr_eacr.e0 : etr_eacr.e1);
-}
-
-static DEVICE_ATTR(stepping_control, 0400, etr_stepping_control_show, NULL);
-
-static ssize_t etr_mode_code_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- if (!etr_port0_online && !etr_port1_online)
- /* Status word is not uptodate if both ports are offline. */
- return -ENODATA;
- return sprintf(buf, "%i\n", (dev == &etr_port0_dev) ?
- etr_port0.esw.psc0 : etr_port0.esw.psc1);
-}
-
-static DEVICE_ATTR(state_code, 0400, etr_mode_code_show, NULL);
-
-static ssize_t etr_untuned_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct etr_aib *aib = etr_aib_from_dev(dev);
-
- if (!aib || !aib->slsw.v1)
- return -ENODATA;
- return sprintf(buf, "%i\n", aib->edf1.u);
-}
-
-static DEVICE_ATTR(untuned, 0400, etr_untuned_show, NULL);
-
-static ssize_t etr_network_id_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct etr_aib *aib = etr_aib_from_dev(dev);
-
- if (!aib || !aib->slsw.v1)
- return -ENODATA;
- return sprintf(buf, "%i\n", aib->edf1.net_id);
-}
-
-static DEVICE_ATTR(network, 0400, etr_network_id_show, NULL);
-
-static ssize_t etr_id_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct etr_aib *aib = etr_aib_from_dev(dev);
-
- if (!aib || !aib->slsw.v1)
- return -ENODATA;
- return sprintf(buf, "%i\n", aib->edf1.etr_id);
-}
-
-static DEVICE_ATTR(id, 0400, etr_id_show, NULL);
-
-static ssize_t etr_port_number_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct etr_aib *aib = etr_aib_from_dev(dev);
-
- if (!aib || !aib->slsw.v1)
- return -ENODATA;
- return sprintf(buf, "%i\n", aib->edf1.etr_pn);
-}
-
-static DEVICE_ATTR(port, 0400, etr_port_number_show, NULL);
-
-static ssize_t etr_coupled_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct etr_aib *aib = etr_aib_from_dev(dev);
-
- if (!aib || !aib->slsw.v3)
- return -ENODATA;
- return sprintf(buf, "%i\n", aib->edf3.c);
-}
-
-static DEVICE_ATTR(coupled, 0400, etr_coupled_show, NULL);
-
-static ssize_t etr_local_time_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct etr_aib *aib = etr_aib_from_dev(dev);
-
- if (!aib || !aib->slsw.v3)
- return -ENODATA;
- return sprintf(buf, "%i\n", aib->edf3.blto);
-}
-
-static DEVICE_ATTR(local_time, 0400, etr_local_time_show, NULL);
-
-static ssize_t etr_utc_offset_show(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct etr_aib *aib = etr_aib_from_dev(dev);
-
- if (!aib || !aib->slsw.v3)
- return -ENODATA;
- return sprintf(buf, "%i\n", aib->edf3.buo);
-}
-
-static DEVICE_ATTR(utc_offset, 0400, etr_utc_offset_show, NULL);
-
-static struct device_attribute *etr_port_attributes[] = {
- &dev_attr_online,
- &dev_attr_stepping_control,
- &dev_attr_state_code,
- &dev_attr_untuned,
- &dev_attr_network,
- &dev_attr_id,
- &dev_attr_port,
- &dev_attr_coupled,
- &dev_attr_local_time,
- &dev_attr_utc_offset,
- NULL
-};
-
-static int __init etr_register_port(struct device *dev)
-{
- struct device_attribute **attr;
- int rc;
-
- rc = device_register(dev);
- if (rc)
- goto out;
- for (attr = etr_port_attributes; *attr; attr++) {
- rc = device_create_file(dev, *attr);
- if (rc)
- goto out_unreg;
- }
- return 0;
-out_unreg:
- for (; attr >= etr_port_attributes; attr--)
- device_remove_file(dev, *attr);
- device_unregister(dev);
-out:
- return rc;
-}
-
-static void __init etr_unregister_port(struct device *dev)
-{
- struct device_attribute **attr;
-
- for (attr = etr_port_attributes; *attr; attr++)
- device_remove_file(dev, *attr);
- device_unregister(dev);
-}
-
-static int __init etr_init_sysfs(void)
-{
- int rc;
-
- rc = subsys_system_register(&etr_subsys, NULL);
- if (rc)
- goto out;
- rc = device_create_file(etr_subsys.dev_root, &dev_attr_stepping_port);
- if (rc)
- goto out_unreg_subsys;
- rc = device_create_file(etr_subsys.dev_root, &dev_attr_stepping_mode);
- if (rc)
- goto out_remove_stepping_port;
- rc = etr_register_port(&etr_port0_dev);
- if (rc)
- goto out_remove_stepping_mode;
- rc = etr_register_port(&etr_port1_dev);
- if (rc)
- goto out_remove_port0;
- return 0;
-
-out_remove_port0:
- etr_unregister_port(&etr_port0_dev);
-out_remove_stepping_mode:
- device_remove_file(etr_subsys.dev_root, &dev_attr_stepping_mode);
-out_remove_stepping_port:
- device_remove_file(etr_subsys.dev_root, &dev_attr_stepping_port);
-out_unreg_subsys:
- bus_unregister(&etr_subsys);
-out:
- return rc;
-}
-
-device_initcall(etr_init_sysfs);
-
/*
* Server Time Protocol (STP) code.
*/
projects / linux-beck.git / commitdiff