2005-04-16 18:20:36 -04:00
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/*
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* Device driver for the PMU on 68K-based Apple PowerBooks
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*
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* The VIA (versatile interface adapter) interfaces to the PMU,
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* a 6805 microprocessor core whose primary function is to control
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* battery charging and system power on the PowerBooks.
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* The PMU also controls the ADB (Apple Desktop Bus) which connects
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* to the keyboard and mouse, as well as the non-volatile RAM
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* and the RTC (real time clock) chip.
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*
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* Adapted for 68K PMU by Joshua M. Thompson
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*
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* Based largely on the PowerMac PMU code by Paul Mackerras and
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* Fabio Riccardi.
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*
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* Also based on the PMU driver from MkLinux by Apple Computer, Inc.
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* and the Open Software Foundation, Inc.
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*/
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#include <stdarg.h>
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/sched.h>
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#include <linux/miscdevice.h>
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#include <linux/blkdev.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/adb.h>
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#include <linux/pmu.h>
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#include <linux/cuda.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/machw.h>
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#include <asm/mac_via.h>
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#include <asm/pgtable.h>
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#include <asm/system.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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/* Misc minor number allocated for /dev/pmu */
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#define PMU_MINOR 154
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/* VIA registers - spaced 0x200 bytes apart */
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#define RS 0x200 /* skip between registers */
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#define B 0 /* B-side data */
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#define A RS /* A-side data */
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#define DIRB (2*RS) /* B-side direction (1=output) */
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#define DIRA (3*RS) /* A-side direction (1=output) */
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#define T1CL (4*RS) /* Timer 1 ctr/latch (low 8 bits) */
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#define T1CH (5*RS) /* Timer 1 counter (high 8 bits) */
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#define T1LL (6*RS) /* Timer 1 latch (low 8 bits) */
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#define T1LH (7*RS) /* Timer 1 latch (high 8 bits) */
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#define T2CL (8*RS) /* Timer 2 ctr/latch (low 8 bits) */
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#define T2CH (9*RS) /* Timer 2 counter (high 8 bits) */
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#define SR (10*RS) /* Shift register */
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#define ACR (11*RS) /* Auxiliary control register */
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#define PCR (12*RS) /* Peripheral control register */
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#define IFR (13*RS) /* Interrupt flag register */
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#define IER (14*RS) /* Interrupt enable register */
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#define ANH (15*RS) /* A-side data, no handshake */
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/* Bits in B data register: both active low */
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#define TACK 0x02 /* Transfer acknowledge (input) */
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#define TREQ 0x04 /* Transfer request (output) */
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/* Bits in ACR */
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#define SR_CTRL 0x1c /* Shift register control bits */
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#define SR_EXT 0x0c /* Shift on external clock */
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#define SR_OUT 0x10 /* Shift out if 1 */
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/* Bits in IFR and IER */
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#define SR_INT 0x04 /* Shift register full/empty */
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#define CB1_INT 0x10 /* transition on CB1 input */
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static enum pmu_state {
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idle,
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sending,
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intack,
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reading,
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reading_intr,
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} pmu_state;
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static struct adb_request *current_req;
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static struct adb_request *last_req;
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static struct adb_request *req_awaiting_reply;
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static unsigned char interrupt_data[32];
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static unsigned char *reply_ptr;
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static int data_index;
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static int data_len;
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static int adb_int_pending;
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static int pmu_adb_flags;
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static int adb_dev_map = 0;
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static struct adb_request bright_req_1, bright_req_2, bright_req_3;
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static int pmu_kind = PMU_UNKNOWN;
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static int pmu_fully_inited = 0;
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int asleep;
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[PATCH] Notifier chain update: API changes
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 04:16:30 -05:00
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BLOCKING_NOTIFIER_HEAD(sleep_notifier_list);
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2005-04-16 18:20:36 -04:00
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static int pmu_probe(void);
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static int pmu_init(void);
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static void pmu_start(void);
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 09:55:46 -04:00
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static irqreturn_t pmu_interrupt(int irq, void *arg);
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2005-04-16 18:20:36 -04:00
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static int pmu_send_request(struct adb_request *req, int sync);
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static int pmu_autopoll(int devs);
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void pmu_poll(void);
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static int pmu_reset_bus(void);
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static int pmu_queue_request(struct adb_request *req);
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static void pmu_start(void);
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static void send_byte(int x);
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static void recv_byte(void);
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static void pmu_done(struct adb_request *req);
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IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 09:55:46 -04:00
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static void pmu_handle_data(unsigned char *data, int len);
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2005-04-16 18:20:36 -04:00
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static void set_volume(int level);
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static void pmu_enable_backlight(int on);
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static void pmu_set_brightness(int level);
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struct adb_driver via_pmu_driver = {
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"68K PMU",
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pmu_probe,
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pmu_init,
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pmu_send_request,
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pmu_autopoll,
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pmu_poll,
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pmu_reset_bus
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};
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/*
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* This table indicates for each PMU opcode:
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* - the number of data bytes to be sent with the command, or -1
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* if a length byte should be sent,
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* - the number of response bytes which the PMU will return, or
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* -1 if it will send a length byte.
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*/
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static s8 pmu_data_len[256][2] = {
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/* 0 1 2 3 4 5 6 7 */
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/*00*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*08*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
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/*10*/ { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*18*/ { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0, 0},
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/*20*/ {-1, 0},{ 0, 0},{ 2, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*28*/ { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{ 0,-1},
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/*30*/ { 4, 0},{20, 0},{-1, 0},{ 3, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*38*/ { 0, 4},{ 0,20},{ 2,-1},{ 2, 1},{ 3,-1},{-1,-1},{-1,-1},{ 4, 0},
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/*40*/ { 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*48*/ { 0, 1},{ 0, 1},{-1,-1},{ 1, 0},{ 1, 0},{-1,-1},{-1,-1},{-1,-1},
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/*50*/ { 1, 0},{ 0, 0},{ 2, 0},{ 2, 0},{-1, 0},{ 1, 0},{ 3, 0},{ 1, 0},
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/*58*/ { 0, 1},{ 1, 0},{ 0, 2},{ 0, 2},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},
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/*60*/ { 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*68*/ { 0, 3},{ 0, 3},{ 0, 2},{ 0, 8},{ 0,-1},{ 0,-1},{-1,-1},{-1,-1},
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/*70*/ { 1, 0},{ 1, 0},{ 1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*78*/ { 0,-1},{ 0,-1},{-1,-1},{-1,-1},{-1,-1},{ 5, 1},{ 4, 1},{ 4, 1},
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/*80*/ { 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*88*/ { 0, 5},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
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/*90*/ { 1, 0},{ 2, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
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/*98*/ { 0, 1},{ 0, 1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
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/*a0*/ { 2, 0},{ 2, 0},{ 2, 0},{ 4, 0},{-1, 0},{ 0, 0},{-1, 0},{-1, 0},
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|
|
|
/*a8*/ { 1, 1},{ 1, 0},{ 3, 0},{ 2, 0},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
|
|
|
|
|
/*b0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
|
|
|
|
|
/*b8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
|
|
|
|
|
/*c0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
|
|
|
|
|
/*c8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
|
|
|
|
|
/*d0*/ { 0, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
|
|
|
|
|
/*d8*/ { 1, 1},{ 1, 1},{-1,-1},{-1,-1},{ 0, 1},{ 0,-1},{-1,-1},{-1,-1},
|
|
|
|
|
/*e0*/ {-1, 0},{ 4, 0},{ 0, 1},{-1, 0},{-1, 0},{ 4, 0},{-1, 0},{-1, 0},
|
|
|
|
|
/*e8*/ { 3,-1},{-1,-1},{ 0, 1},{-1,-1},{ 0,-1},{-1,-1},{-1,-1},{ 0, 0},
|
|
|
|
|
/*f0*/ {-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},{-1, 0},
|
|
|
|
|
/*f8*/ {-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},{-1,-1},
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
int pmu_probe(void)
|
|
|
|
|
{
|
|
|
|
|
if (macintosh_config->adb_type == MAC_ADB_PB1) {
|
|
|
|
|
pmu_kind = PMU_68K_V1;
|
|
|
|
|
} else if (macintosh_config->adb_type == MAC_ADB_PB2) {
|
|
|
|
|
pmu_kind = PMU_68K_V2;
|
|
|
|
|
} else {
|
|
|
|
|
return -ENODEV;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
pmu_state = idle;
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
pmu_init(void)
|
|
|
|
|
{
|
|
|
|
|
int timeout;
|
|
|
|
|
volatile struct adb_request req;
|
|
|
|
|
|
|
|
|
|
via2[B] |= TREQ; /* negate TREQ */
|
|
|
|
|
via2[DIRB] = (via2[DIRB] | TREQ) & ~TACK; /* TACK in, TREQ out */
|
|
|
|
|
|
|
|
|
|
pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK, PMU_INT_ADB);
|
|
|
|
|
timeout = 100000;
|
|
|
|
|
while (!req.complete) {
|
|
|
|
|
if (--timeout < 0) {
|
|
|
|
|
printk(KERN_ERR "pmu_init: no response from PMU\n");
|
|
|
|
|
return -EAGAIN;
|
|
|
|
|
}
|
|
|
|
|
udelay(10);
|
|
|
|
|
pmu_poll();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* ack all pending interrupts */
|
|
|
|
|
timeout = 100000;
|
|
|
|
|
interrupt_data[0] = 1;
|
|
|
|
|
while (interrupt_data[0] || pmu_state != idle) {
|
|
|
|
|
if (--timeout < 0) {
|
|
|
|
|
printk(KERN_ERR "pmu_init: timed out acking intrs\n");
|
|
|
|
|
return -EAGAIN;
|
|
|
|
|
}
|
|
|
|
|
if (pmu_state == idle) {
|
|
|
|
|
adb_int_pending = 1;
|
2006-10-07 09:16:45 -04:00
|
|
|
pmu_interrupt(0, NULL);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
pmu_poll();
|
|
|
|
|
udelay(10);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
pmu_request((struct adb_request *) &req, NULL, 2, PMU_SET_INTR_MASK,
|
|
|
|
|
PMU_INT_ADB_AUTO|PMU_INT_SNDBRT|PMU_INT_ADB);
|
|
|
|
|
timeout = 100000;
|
|
|
|
|
while (!req.complete) {
|
|
|
|
|
if (--timeout < 0) {
|
|
|
|
|
printk(KERN_ERR "pmu_init: no response from PMU\n");
|
|
|
|
|
return -EAGAIN;
|
|
|
|
|
}
|
|
|
|
|
udelay(10);
|
|
|
|
|
pmu_poll();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
bright_req_1.complete = 1;
|
|
|
|
|
bright_req_2.complete = 1;
|
|
|
|
|
bright_req_3.complete = 1;
|
|
|
|
|
|
|
|
|
|
if (request_irq(IRQ_MAC_ADB_SR, pmu_interrupt, 0, "pmu-shift",
|
|
|
|
|
pmu_interrupt)) {
|
|
|
|
|
printk(KERN_ERR "pmu_init: can't get irq %d\n",
|
|
|
|
|
IRQ_MAC_ADB_SR);
|
|
|
|
|
return -EAGAIN;
|
|
|
|
|
}
|
|
|
|
|
if (request_irq(IRQ_MAC_ADB_CL, pmu_interrupt, 0, "pmu-clock",
|
|
|
|
|
pmu_interrupt)) {
|
|
|
|
|
printk(KERN_ERR "pmu_init: can't get irq %d\n",
|
|
|
|
|
IRQ_MAC_ADB_CL);
|
|
|
|
|
free_irq(IRQ_MAC_ADB_SR, pmu_interrupt);
|
|
|
|
|
return -EAGAIN;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
pmu_fully_inited = 1;
|
|
|
|
|
|
|
|
|
|
/* Enable backlight */
|
|
|
|
|
pmu_enable_backlight(1);
|
|
|
|
|
|
|
|
|
|
printk("adb: PMU 68K driver v0.5 for Unified ADB.\n");
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
pmu_get_model(void)
|
|
|
|
|
{
|
|
|
|
|
return pmu_kind;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Send an ADB command */
|
|
|
|
|
static int
|
|
|
|
|
pmu_send_request(struct adb_request *req, int sync)
|
|
|
|
|
{
|
|
|
|
|
int i, ret;
|
|
|
|
|
|
|
|
|
|
if (!pmu_fully_inited)
|
|
|
|
|
{
|
|
|
|
|
req->complete = 1;
|
|
|
|
|
return -ENXIO;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
ret = -EINVAL;
|
|
|
|
|
|
|
|
|
|
switch (req->data[0]) {
|
|
|
|
|
case PMU_PACKET:
|
|
|
|
|
for (i = 0; i < req->nbytes - 1; ++i)
|
|
|
|
|
req->data[i] = req->data[i+1];
|
|
|
|
|
--req->nbytes;
|
|
|
|
|
if (pmu_data_len[req->data[0]][1] != 0) {
|
|
|
|
|
req->reply[0] = ADB_RET_OK;
|
|
|
|
|
req->reply_len = 1;
|
|
|
|
|
} else
|
|
|
|
|
req->reply_len = 0;
|
|
|
|
|
ret = pmu_queue_request(req);
|
|
|
|
|
break;
|
|
|
|
|
case CUDA_PACKET:
|
|
|
|
|
switch (req->data[1]) {
|
|
|
|
|
case CUDA_GET_TIME:
|
|
|
|
|
if (req->nbytes != 2)
|
|
|
|
|
break;
|
|
|
|
|
req->data[0] = PMU_READ_RTC;
|
|
|
|
|
req->nbytes = 1;
|
|
|
|
|
req->reply_len = 3;
|
|
|
|
|
req->reply[0] = CUDA_PACKET;
|
|
|
|
|
req->reply[1] = 0;
|
|
|
|
|
req->reply[2] = CUDA_GET_TIME;
|
|
|
|
|
ret = pmu_queue_request(req);
|
|
|
|
|
break;
|
|
|
|
|
case CUDA_SET_TIME:
|
|
|
|
|
if (req->nbytes != 6)
|
|
|
|
|
break;
|
|
|
|
|
req->data[0] = PMU_SET_RTC;
|
|
|
|
|
req->nbytes = 5;
|
|
|
|
|
for (i = 1; i <= 4; ++i)
|
|
|
|
|
req->data[i] = req->data[i+1];
|
|
|
|
|
req->reply_len = 3;
|
|
|
|
|
req->reply[0] = CUDA_PACKET;
|
|
|
|
|
req->reply[1] = 0;
|
|
|
|
|
req->reply[2] = CUDA_SET_TIME;
|
|
|
|
|
ret = pmu_queue_request(req);
|
|
|
|
|
break;
|
|
|
|
|
case CUDA_GET_PRAM:
|
|
|
|
|
if (req->nbytes != 4)
|
|
|
|
|
break;
|
|
|
|
|
req->data[0] = PMU_READ_NVRAM;
|
|
|
|
|
req->data[1] = req->data[2];
|
|
|
|
|
req->data[2] = req->data[3];
|
|
|
|
|
req->nbytes = 3;
|
|
|
|
|
req->reply_len = 3;
|
|
|
|
|
req->reply[0] = CUDA_PACKET;
|
|
|
|
|
req->reply[1] = 0;
|
|
|
|
|
req->reply[2] = CUDA_GET_PRAM;
|
|
|
|
|
ret = pmu_queue_request(req);
|
|
|
|
|
break;
|
|
|
|
|
case CUDA_SET_PRAM:
|
|
|
|
|
if (req->nbytes != 5)
|
|
|
|
|
break;
|
|
|
|
|
req->data[0] = PMU_WRITE_NVRAM;
|
|
|
|
|
req->data[1] = req->data[2];
|
|
|
|
|
req->data[2] = req->data[3];
|
|
|
|
|
req->data[3] = req->data[4];
|
|
|
|
|
req->nbytes = 4;
|
|
|
|
|
req->reply_len = 3;
|
|
|
|
|
req->reply[0] = CUDA_PACKET;
|
|
|
|
|
req->reply[1] = 0;
|
|
|
|
|
req->reply[2] = CUDA_SET_PRAM;
|
|
|
|
|
ret = pmu_queue_request(req);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
case ADB_PACKET:
|
|
|
|
|
for (i = req->nbytes - 1; i > 1; --i)
|
|
|
|
|
req->data[i+2] = req->data[i];
|
|
|
|
|
req->data[3] = req->nbytes - 2;
|
|
|
|
|
req->data[2] = pmu_adb_flags;
|
|
|
|
|
/*req->data[1] = req->data[1];*/
|
|
|
|
|
req->data[0] = PMU_ADB_CMD;
|
|
|
|
|
req->nbytes += 2;
|
|
|
|
|
req->reply_expected = 1;
|
|
|
|
|
req->reply_len = 0;
|
|
|
|
|
ret = pmu_queue_request(req);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
if (ret)
|
|
|
|
|
{
|
|
|
|
|
req->complete = 1;
|
|
|
|
|
return ret;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (sync) {
|
|
|
|
|
while (!req->complete)
|
|
|
|
|
pmu_poll();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Enable/disable autopolling */
|
|
|
|
|
static int
|
|
|
|
|
pmu_autopoll(int devs)
|
|
|
|
|
{
|
|
|
|
|
struct adb_request req;
|
|
|
|
|
|
|
|
|
|
if (!pmu_fully_inited) return -ENXIO;
|
|
|
|
|
|
|
|
|
|
if (devs) {
|
|
|
|
|
adb_dev_map = devs;
|
|
|
|
|
pmu_request(&req, NULL, 5, PMU_ADB_CMD, 0, 0x86,
|
|
|
|
|
adb_dev_map >> 8, adb_dev_map);
|
|
|
|
|
pmu_adb_flags = 2;
|
|
|
|
|
} else {
|
|
|
|
|
pmu_request(&req, NULL, 1, PMU_ADB_POLL_OFF);
|
|
|
|
|
pmu_adb_flags = 0;
|
|
|
|
|
}
|
|
|
|
|
while (!req.complete)
|
|
|
|
|
pmu_poll();
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Reset the ADB bus */
|
|
|
|
|
static int
|
|
|
|
|
pmu_reset_bus(void)
|
|
|
|
|
{
|
|
|
|
|
struct adb_request req;
|
|
|
|
|
long timeout;
|
|
|
|
|
int save_autopoll = adb_dev_map;
|
|
|
|
|
|
|
|
|
|
if (!pmu_fully_inited) return -ENXIO;
|
|
|
|
|
|
|
|
|
|
/* anyone got a better idea?? */
|
|
|
|
|
pmu_autopoll(0);
|
|
|
|
|
|
|
|
|
|
req.nbytes = 5;
|
|
|
|
|
req.done = NULL;
|
|
|
|
|
req.data[0] = PMU_ADB_CMD;
|
|
|
|
|
req.data[1] = 0;
|
|
|
|
|
req.data[2] = 3; /* ADB_BUSRESET ??? */
|
|
|
|
|
req.data[3] = 0;
|
|
|
|
|
req.data[4] = 0;
|
|
|
|
|
req.reply_len = 0;
|
|
|
|
|
req.reply_expected = 1;
|
|
|
|
|
if (pmu_queue_request(&req) != 0)
|
|
|
|
|
{
|
|
|
|
|
printk(KERN_ERR "pmu_adb_reset_bus: pmu_queue_request failed\n");
|
|
|
|
|
return -EIO;
|
|
|
|
|
}
|
|
|
|
|
while (!req.complete)
|
|
|
|
|
pmu_poll();
|
|
|
|
|
timeout = 100000;
|
|
|
|
|
while (!req.complete) {
|
|
|
|
|
if (--timeout < 0) {
|
|
|
|
|
printk(KERN_ERR "pmu_adb_reset_bus (reset): no response from PMU\n");
|
|
|
|
|
return -EIO;
|
|
|
|
|
}
|
|
|
|
|
udelay(10);
|
|
|
|
|
pmu_poll();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (save_autopoll != 0)
|
|
|
|
|
pmu_autopoll(save_autopoll);
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Construct and send a pmu request */
|
|
|
|
|
int
|
|
|
|
|
pmu_request(struct adb_request *req, void (*done)(struct adb_request *),
|
|
|
|
|
int nbytes, ...)
|
|
|
|
|
{
|
|
|
|
|
va_list list;
|
|
|
|
|
int i;
|
|
|
|
|
|
|
|
|
|
if (nbytes < 0 || nbytes > 32) {
|
|
|
|
|
printk(KERN_ERR "pmu_request: bad nbytes (%d)\n", nbytes);
|
|
|
|
|
req->complete = 1;
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
req->nbytes = nbytes;
|
|
|
|
|
req->done = done;
|
|
|
|
|
va_start(list, nbytes);
|
|
|
|
|
for (i = 0; i < nbytes; ++i)
|
|
|
|
|
req->data[i] = va_arg(list, int);
|
|
|
|
|
va_end(list);
|
|
|
|
|
if (pmu_data_len[req->data[0]][1] != 0) {
|
|
|
|
|
req->reply[0] = ADB_RET_OK;
|
|
|
|
|
req->reply_len = 1;
|
|
|
|
|
} else
|
|
|
|
|
req->reply_len = 0;
|
|
|
|
|
req->reply_expected = 0;
|
|
|
|
|
return pmu_queue_request(req);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static int
|
|
|
|
|
pmu_queue_request(struct adb_request *req)
|
|
|
|
|
{
|
|
|
|
|
unsigned long flags;
|
|
|
|
|
int nsend;
|
|
|
|
|
|
|
|
|
|
if (req->nbytes <= 0) {
|
|
|
|
|
req->complete = 1;
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
nsend = pmu_data_len[req->data[0]][0];
|
|
|
|
|
if (nsend >= 0 && req->nbytes != nsend + 1) {
|
|
|
|
|
req->complete = 1;
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
|
2006-01-12 04:06:34 -05:00
|
|
|
req->next = NULL;
|
2005-04-16 18:20:36 -04:00
|
|
|
req->sent = 0;
|
|
|
|
|
req->complete = 0;
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
|
|
|
|
|
if (current_req != 0) {
|
|
|
|
|
last_req->next = req;
|
|
|
|
|
last_req = req;
|
|
|
|
|
} else {
|
|
|
|
|
current_req = req;
|
|
|
|
|
last_req = req;
|
|
|
|
|
if (pmu_state == idle)
|
|
|
|
|
pmu_start();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
send_byte(int x)
|
|
|
|
|
{
|
|
|
|
|
via1[ACR] |= SR_CTRL;
|
|
|
|
|
via1[SR] = x;
|
|
|
|
|
via2[B] &= ~TREQ; /* assert TREQ */
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
recv_byte(void)
|
|
|
|
|
{
|
|
|
|
|
char c;
|
|
|
|
|
|
|
|
|
|
via1[ACR] = (via1[ACR] | SR_EXT) & ~SR_OUT;
|
|
|
|
|
c = via1[SR]; /* resets SR */
|
|
|
|
|
via2[B] &= ~TREQ;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
pmu_start(void)
|
|
|
|
|
{
|
|
|
|
|
unsigned long flags;
|
|
|
|
|
struct adb_request *req;
|
|
|
|
|
|
|
|
|
|
/* assert pmu_state == idle */
|
|
|
|
|
/* get the packet to send */
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
req = current_req;
|
|
|
|
|
if (req == 0 || pmu_state != idle
|
|
|
|
|
|| (req->reply_expected && req_awaiting_reply))
|
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
|
|
pmu_state = sending;
|
|
|
|
|
data_index = 1;
|
|
|
|
|
data_len = pmu_data_len[req->data[0]][0];
|
|
|
|
|
|
|
|
|
|
/* set the shift register to shift out and send a byte */
|
|
|
|
|
send_byte(req->data[0]);
|
|
|
|
|
|
|
|
|
|
out:
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
pmu_poll(void)
|
|
|
|
|
{
|
|
|
|
|
unsigned long flags;
|
|
|
|
|
|
|
|
|
|
local_irq_save(flags);
|
|
|
|
|
if (via1[IFR] & SR_INT) {
|
|
|
|
|
via1[IFR] = SR_INT;
|
2006-10-07 09:16:45 -04:00
|
|
|
pmu_interrupt(IRQ_MAC_ADB_SR, NULL);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
if (via1[IFR] & CB1_INT) {
|
|
|
|
|
via1[IFR] = CB1_INT;
|
2006-10-07 09:16:45 -04:00
|
|
|
pmu_interrupt(IRQ_MAC_ADB_CL, NULL);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
local_irq_restore(flags);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static irqreturn_t
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 09:55:46 -04:00
|
|
|
pmu_interrupt(int irq, void *dev_id)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
|
struct adb_request *req;
|
|
|
|
|
int timeout, bite = 0; /* to prevent compiler warning */
|
|
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
|
printk("pmu_interrupt: irq %d state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
|
|
|
|
|
irq, pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
if (irq == IRQ_MAC_ADB_CL) { /* CB1 interrupt */
|
|
|
|
|
adb_int_pending = 1;
|
|
|
|
|
} else if (irq == IRQ_MAC_ADB_SR) { /* SR interrupt */
|
|
|
|
|
if (via2[B] & TACK) {
|
|
|
|
|
printk(KERN_DEBUG "PMU: SR_INT but ack still high! (%x)\n", via2[B]);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* if reading grab the byte */
|
|
|
|
|
if ((via1[ACR] & SR_OUT) == 0) bite = via1[SR];
|
|
|
|
|
|
|
|
|
|
/* reset TREQ and wait for TACK to go high */
|
|
|
|
|
via2[B] |= TREQ;
|
|
|
|
|
timeout = 3200;
|
|
|
|
|
while (!(via2[B] & TACK)) {
|
|
|
|
|
if (--timeout < 0) {
|
|
|
|
|
printk(KERN_ERR "PMU not responding (!ack)\n");
|
|
|
|
|
goto finish;
|
|
|
|
|
}
|
|
|
|
|
udelay(10);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
switch (pmu_state) {
|
|
|
|
|
case sending:
|
|
|
|
|
req = current_req;
|
|
|
|
|
if (data_len < 0) {
|
|
|
|
|
data_len = req->nbytes - 1;
|
|
|
|
|
send_byte(data_len);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
if (data_index <= data_len) {
|
|
|
|
|
send_byte(req->data[data_index++]);
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
req->sent = 1;
|
|
|
|
|
data_len = pmu_data_len[req->data[0]][1];
|
|
|
|
|
if (data_len == 0) {
|
|
|
|
|
pmu_state = idle;
|
|
|
|
|
current_req = req->next;
|
|
|
|
|
if (req->reply_expected)
|
|
|
|
|
req_awaiting_reply = req;
|
|
|
|
|
else
|
|
|
|
|
pmu_done(req);
|
|
|
|
|
} else {
|
|
|
|
|
pmu_state = reading;
|
|
|
|
|
data_index = 0;
|
|
|
|
|
reply_ptr = req->reply + req->reply_len;
|
|
|
|
|
recv_byte();
|
|
|
|
|
}
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case intack:
|
|
|
|
|
data_index = 0;
|
|
|
|
|
data_len = -1;
|
|
|
|
|
pmu_state = reading_intr;
|
|
|
|
|
reply_ptr = interrupt_data;
|
|
|
|
|
recv_byte();
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
case reading:
|
|
|
|
|
case reading_intr:
|
|
|
|
|
if (data_len == -1) {
|
|
|
|
|
data_len = bite;
|
|
|
|
|
if (bite > 32)
|
|
|
|
|
printk(KERN_ERR "PMU: bad reply len %d\n",
|
|
|
|
|
bite);
|
|
|
|
|
} else {
|
|
|
|
|
reply_ptr[data_index++] = bite;
|
|
|
|
|
}
|
|
|
|
|
if (data_index < data_len) {
|
|
|
|
|
recv_byte();
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
if (pmu_state == reading_intr) {
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 09:55:46 -04:00
|
|
|
pmu_handle_data(interrupt_data, data_index);
|
2005-04-16 18:20:36 -04:00
|
|
|
} else {
|
|
|
|
|
req = current_req;
|
|
|
|
|
current_req = req->next;
|
|
|
|
|
req->reply_len += data_index;
|
|
|
|
|
pmu_done(req);
|
|
|
|
|
}
|
|
|
|
|
pmu_state = idle;
|
|
|
|
|
|
|
|
|
|
break;
|
|
|
|
|
|
|
|
|
|
default:
|
|
|
|
|
printk(KERN_ERR "pmu_interrupt: unknown state %d?\n",
|
|
|
|
|
pmu_state);
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
finish:
|
|
|
|
|
if (pmu_state == idle) {
|
|
|
|
|
if (adb_int_pending) {
|
|
|
|
|
pmu_state = intack;
|
|
|
|
|
send_byte(PMU_INT_ACK);
|
|
|
|
|
adb_int_pending = 0;
|
|
|
|
|
} else if (current_req) {
|
|
|
|
|
pmu_start();
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#if 0
|
|
|
|
|
printk("pmu_interrupt: exit state %d acr %02X, b %02X data_index %d/%d adb_int_pending %d\n",
|
|
|
|
|
pmu_state, (uint) via1[ACR], (uint) via2[B], data_index, data_len, adb_int_pending);
|
|
|
|
|
#endif
|
|
|
|
|
return IRQ_HANDLED;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
pmu_done(struct adb_request *req)
|
|
|
|
|
{
|
|
|
|
|
req->complete = 1;
|
|
|
|
|
if (req->done)
|
|
|
|
|
(*req->done)(req);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Interrupt data could be the result data from an ADB cmd */
|
|
|
|
|
static void
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 09:55:46 -04:00
|
|
|
pmu_handle_data(unsigned char *data, int len)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
|
static int show_pmu_ints = 1;
|
|
|
|
|
|
|
|
|
|
asleep = 0;
|
|
|
|
|
if (len < 1) {
|
|
|
|
|
adb_int_pending = 0;
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
if (data[0] & PMU_INT_ADB) {
|
|
|
|
|
if ((data[0] & PMU_INT_ADB_AUTO) == 0) {
|
|
|
|
|
struct adb_request *req = req_awaiting_reply;
|
|
|
|
|
if (req == 0) {
|
|
|
|
|
printk(KERN_ERR "PMU: extra ADB reply\n");
|
|
|
|
|
return;
|
|
|
|
|
}
|
2006-01-12 04:06:34 -05:00
|
|
|
req_awaiting_reply = NULL;
|
2005-04-16 18:20:36 -04:00
|
|
|
if (len <= 2)
|
|
|
|
|
req->reply_len = 0;
|
|
|
|
|
else {
|
|
|
|
|
memcpy(req->reply, data + 1, len - 1);
|
|
|
|
|
req->reply_len = len - 1;
|
|
|
|
|
}
|
|
|
|
|
pmu_done(req);
|
|
|
|
|
} else {
|
IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.
The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around. On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).
Where appropriate, an arch may override the generic storage facility and do
something different with the variable. On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.
Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions. Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller. A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.
I've build this code with allyesconfig for x86_64 and i386. I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.
This will affect all archs. Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:
struct pt_regs *old_regs = set_irq_regs(regs);
And put the old one back at the end:
set_irq_regs(old_regs);
Don't pass regs through to generic_handle_irq() or __do_IRQ().
In timer_interrupt(), this sort of change will be necessary:
- update_process_times(user_mode(regs));
- profile_tick(CPU_PROFILING, regs);
+ update_process_times(user_mode(get_irq_regs()));
+ profile_tick(CPU_PROFILING);
I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().
Some notes on the interrupt handling in the drivers:
(*) input_dev() is now gone entirely. The regs pointer is no longer stored in
the input_dev struct.
(*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does
something different depending on whether it's been supplied with a regs
pointer or not.
(*) Various IRQ handler function pointers have been moved to type
irq_handler_t.
Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 09:55:46 -04:00
|
|
|
adb_input(data+1, len-1, 1);
|
2005-04-16 18:20:36 -04:00
|
|
|
}
|
|
|
|
|
} else {
|
|
|
|
|
if (data[0] == 0x08 && len == 3) {
|
|
|
|
|
/* sound/brightness buttons pressed */
|
|
|
|
|
pmu_set_brightness(data[1] >> 3);
|
|
|
|
|
set_volume(data[2]);
|
|
|
|
|
} else if (show_pmu_ints
|
|
|
|
|
&& !(data[0] == PMU_INT_TICK && len == 1)) {
|
|
|
|
|
int i;
|
|
|
|
|
printk(KERN_DEBUG "pmu intr");
|
|
|
|
|
for (i = 0; i < len; ++i)
|
|
|
|
|
printk(" %.2x", data[i]);
|
|
|
|
|
printk("\n");
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int backlight_level = -1;
|
|
|
|
|
int backlight_enabled = 0;
|
|
|
|
|
|
|
|
|
|
#define LEVEL_TO_BRIGHT(lev) ((lev) < 1? 0x7f: 0x4a - ((lev) << 1))
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
pmu_enable_backlight(int on)
|
|
|
|
|
{
|
|
|
|
|
struct adb_request req;
|
|
|
|
|
|
|
|
|
|
if (on) {
|
|
|
|
|
/* first call: get current backlight value */
|
|
|
|
|
if (backlight_level < 0) {
|
|
|
|
|
switch(pmu_kind) {
|
|
|
|
|
case PMU_68K_V1:
|
|
|
|
|
case PMU_68K_V2:
|
|
|
|
|
pmu_request(&req, NULL, 3, PMU_READ_NVRAM, 0x14, 0xe);
|
|
|
|
|
while (!req.complete)
|
|
|
|
|
pmu_poll();
|
|
|
|
|
printk(KERN_DEBUG "pmu: nvram returned bright: %d\n", (int)req.reply[1]);
|
|
|
|
|
backlight_level = req.reply[1];
|
|
|
|
|
break;
|
|
|
|
|
default:
|
|
|
|
|
backlight_enabled = 0;
|
|
|
|
|
return;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
pmu_request(&req, NULL, 2, PMU_BACKLIGHT_BRIGHT,
|
|
|
|
|
LEVEL_TO_BRIGHT(backlight_level));
|
|
|
|
|
while (!req.complete)
|
|
|
|
|
pmu_poll();
|
|
|
|
|
}
|
|
|
|
|
pmu_request(&req, NULL, 2, PMU_POWER_CTRL,
|
|
|
|
|
PMU_POW_BACKLIGHT | (on ? PMU_POW_ON : PMU_POW_OFF));
|
|
|
|
|
while (!req.complete)
|
|
|
|
|
pmu_poll();
|
|
|
|
|
backlight_enabled = on;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
pmu_set_brightness(int level)
|
|
|
|
|
{
|
|
|
|
|
int bright;
|
|
|
|
|
|
|
|
|
|
backlight_level = level;
|
|
|
|
|
bright = LEVEL_TO_BRIGHT(level);
|
|
|
|
|
if (!backlight_enabled)
|
|
|
|
|
return;
|
|
|
|
|
if (bright_req_1.complete)
|
|
|
|
|
pmu_request(&bright_req_1, NULL, 2, PMU_BACKLIGHT_BRIGHT,
|
|
|
|
|
bright);
|
|
|
|
|
if (bright_req_2.complete)
|
|
|
|
|
pmu_request(&bright_req_2, NULL, 2, PMU_POWER_CTRL,
|
|
|
|
|
PMU_POW_BACKLIGHT | (bright < 0x7f ? PMU_POW_ON : PMU_POW_OFF));
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
|
pmu_enable_irled(int on)
|
|
|
|
|
{
|
|
|
|
|
struct adb_request req;
|
|
|
|
|
|
|
|
|
|
pmu_request(&req, NULL, 2, PMU_POWER_CTRL, PMU_POW_IRLED |
|
|
|
|
|
(on ? PMU_POW_ON : PMU_POW_OFF));
|
|
|
|
|
while (!req.complete)
|
|
|
|
|
pmu_poll();
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static void
|
|
|
|
|
set_volume(int level)
|
|
|
|
|
{
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
int
|
|
|
|
|
pmu_present(void)
|
|
|
|
|
{
|
|
|
|
|
return (pmu_kind != PMU_UNKNOWN);
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
#if 0 /* needs some work for 68K */
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* This struct is used to store config register values for
|
|
|
|
|
* PCI devices which may get powered off when we sleep.
|
|
|
|
|
*/
|
|
|
|
|
static struct pci_save {
|
|
|
|
|
u16 command;
|
|
|
|
|
u16 cache_lat;
|
|
|
|
|
u16 intr;
|
|
|
|
|
} *pbook_pci_saves;
|
|
|
|
|
static int n_pbook_pci_saves;
|
|
|
|
|
|
2005-09-17 11:36:54 -04:00
|
|
|
static inline void
|
2005-04-16 18:20:36 -04:00
|
|
|
pbook_pci_save(void)
|
|
|
|
|
{
|
|
|
|
|
int npci;
|
|
|
|
|
struct pci_dev *pd = NULL;
|
|
|
|
|
struct pci_save *ps;
|
|
|
|
|
|
|
|
|
|
npci = 0;
|
2006-10-01 02:27:32 -04:00
|
|
|
while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL)
|
2005-04-16 18:20:36 -04:00
|
|
|
++npci;
|
|
|
|
|
n_pbook_pci_saves = npci;
|
|
|
|
|
if (npci == 0)
|
|
|
|
|
return;
|
2006-12-13 03:35:56 -05:00
|
|
|
ps = kmalloc(npci * sizeof(*ps), GFP_KERNEL);
|
2005-04-16 18:20:36 -04:00
|
|
|
pbook_pci_saves = ps;
|
|
|
|
|
if (ps == NULL)
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
|
|
pd = NULL;
|
2006-10-01 02:27:32 -04:00
|
|
|
while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
|
2005-04-16 18:20:36 -04:00
|
|
|
pci_read_config_word(pd, PCI_COMMAND, &ps->command);
|
|
|
|
|
pci_read_config_word(pd, PCI_CACHE_LINE_SIZE, &ps->cache_lat);
|
|
|
|
|
pci_read_config_word(pd, PCI_INTERRUPT_LINE, &ps->intr);
|
|
|
|
|
++ps;
|
|
|
|
|
--npci;
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
2005-09-17 11:36:54 -04:00
|
|
|
static inline void
|
2005-04-16 18:20:36 -04:00
|
|
|
pbook_pci_restore(void)
|
|
|
|
|
{
|
|
|
|
|
u16 cmd;
|
|
|
|
|
struct pci_save *ps = pbook_pci_saves;
|
|
|
|
|
struct pci_dev *pd = NULL;
|
|
|
|
|
int j;
|
|
|
|
|
|
2006-10-01 02:27:32 -04:00
|
|
|
while ((pd = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, pd)) != NULL) {
|
2005-04-16 18:20:36 -04:00
|
|
|
if (ps->command == 0)
|
|
|
|
|
continue;
|
|
|
|
|
pci_read_config_word(pd, PCI_COMMAND, &cmd);
|
|
|
|
|
if ((ps->command & ~cmd) == 0)
|
|
|
|
|
continue;
|
|
|
|
|
switch (pd->hdr_type) {
|
|
|
|
|
case PCI_HEADER_TYPE_NORMAL:
|
|
|
|
|
for (j = 0; j < 6; ++j)
|
|
|
|
|
pci_write_config_dword(pd,
|
|
|
|
|
PCI_BASE_ADDRESS_0 + j*4,
|
|
|
|
|
pd->resource[j].start);
|
|
|
|
|
pci_write_config_dword(pd, PCI_ROM_ADDRESS,
|
|
|
|
|
pd->resource[PCI_ROM_RESOURCE].start);
|
|
|
|
|
pci_write_config_word(pd, PCI_CACHE_LINE_SIZE,
|
|
|
|
|
ps->cache_lat);
|
|
|
|
|
pci_write_config_word(pd, PCI_INTERRUPT_LINE,
|
|
|
|
|
ps->intr);
|
|
|
|
|
pci_write_config_word(pd, PCI_COMMAND, ps->command);
|
|
|
|
|
break;
|
|
|
|
|
/* other header types not restored at present */
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Put the powerbook to sleep.
|
|
|
|
|
*/
|
|
|
|
|
#define IRQ_ENABLE ((unsigned int *)0xf3000024)
|
|
|
|
|
#define MEM_CTRL ((unsigned int *)0xf8000070)
|
|
|
|
|
|
2005-09-17 11:36:54 -04:00
|
|
|
int powerbook_sleep(void)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
|
int ret, i, x;
|
|
|
|
|
static int save_backlight;
|
|
|
|
|
static unsigned int save_irqen;
|
|
|
|
|
unsigned long msr;
|
|
|
|
|
unsigned int hid0;
|
|
|
|
|
unsigned long p, wait;
|
|
|
|
|
struct adb_request sleep_req;
|
|
|
|
|
|
|
|
|
|
/* Notify device drivers */
|
[PATCH] Notifier chain update: API changes
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 04:16:30 -05:00
|
|
|
ret = blocking_notifier_call_chain(&sleep_notifier_list,
|
|
|
|
|
PBOOK_SLEEP, NULL);
|
2005-04-16 18:20:36 -04:00
|
|
|
if (ret & NOTIFY_STOP_MASK)
|
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
|
|
/* Sync the disks. */
|
|
|
|
|
/* XXX It would be nice to have some way to ensure that
|
|
|
|
|
* nobody is dirtying any new buffers while we wait. */
|
|
|
|
|
sys_sync();
|
|
|
|
|
|
|
|
|
|
/* Turn off the display backlight */
|
|
|
|
|
save_backlight = backlight_enabled;
|
|
|
|
|
if (save_backlight)
|
|
|
|
|
pmu_enable_backlight(0);
|
|
|
|
|
|
|
|
|
|
/* Give the disks a little time to actually finish writing */
|
|
|
|
|
for (wait = jiffies + (HZ/4); time_before(jiffies, wait); )
|
|
|
|
|
mb();
|
|
|
|
|
|
|
|
|
|
/* Disable all interrupts except pmu */
|
|
|
|
|
save_irqen = in_le32(IRQ_ENABLE);
|
|
|
|
|
for (i = 0; i < 32; ++i)
|
|
|
|
|
if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
|
|
|
|
|
disable_irq(i);
|
|
|
|
|
asm volatile("mtdec %0" : : "r" (0x7fffffff));
|
|
|
|
|
|
|
|
|
|
/* Save the state of PCI config space for some slots */
|
|
|
|
|
pbook_pci_save();
|
|
|
|
|
|
|
|
|
|
/* Set the memory controller to keep the memory refreshed
|
|
|
|
|
while we're asleep */
|
|
|
|
|
for (i = 0x403f; i >= 0x4000; --i) {
|
|
|
|
|
out_be32(MEM_CTRL, i);
|
|
|
|
|
do {
|
|
|
|
|
x = (in_be32(MEM_CTRL) >> 16) & 0x3ff;
|
|
|
|
|
} while (x == 0);
|
|
|
|
|
if (x >= 0x100)
|
|
|
|
|
break;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/* Ask the PMU to put us to sleep */
|
|
|
|
|
pmu_request(&sleep_req, NULL, 5, PMU_SLEEP, 'M', 'A', 'T', 'T');
|
|
|
|
|
while (!sleep_req.complete)
|
|
|
|
|
mb();
|
|
|
|
|
/* displacement-flush the L2 cache - necessary? */
|
|
|
|
|
for (p = KERNELBASE; p < KERNELBASE + 0x100000; p += 0x1000)
|
|
|
|
|
i = *(volatile int *)p;
|
|
|
|
|
asleep = 1;
|
|
|
|
|
|
|
|
|
|
/* Put the CPU into sleep mode */
|
|
|
|
|
asm volatile("mfspr %0,1008" : "=r" (hid0) :);
|
|
|
|
|
hid0 = (hid0 & ~(HID0_NAP | HID0_DOZE)) | HID0_SLEEP;
|
|
|
|
|
asm volatile("mtspr 1008,%0" : : "r" (hid0));
|
|
|
|
|
local_save_flags(msr);
|
|
|
|
|
msr |= MSR_POW | MSR_EE;
|
|
|
|
|
local_irq_restore(msr);
|
|
|
|
|
udelay(10);
|
|
|
|
|
|
|
|
|
|
/* OK, we're awake again, start restoring things */
|
|
|
|
|
out_be32(MEM_CTRL, 0x3f);
|
|
|
|
|
pbook_pci_restore();
|
|
|
|
|
|
|
|
|
|
/* wait for the PMU interrupt sequence to complete */
|
|
|
|
|
while (asleep)
|
|
|
|
|
mb();
|
|
|
|
|
|
|
|
|
|
/* reenable interrupts */
|
|
|
|
|
for (i = 0; i < 32; ++i)
|
|
|
|
|
if (i != vias->intrs[0].line && (save_irqen & (1 << i)))
|
|
|
|
|
enable_irq(i);
|
|
|
|
|
|
|
|
|
|
/* Notify drivers */
|
[PATCH] Notifier chain update: API changes
The kernel's implementation of notifier chains is unsafe. There is no
protection against entries being added to or removed from a chain while the
chain is in use. The issues were discussed in this thread:
http://marc.theaimsgroup.com/?l=linux-kernel&m=113018709002036&w=2
We noticed that notifier chains in the kernel fall into two basic usage
classes:
"Blocking" chains are always called from a process context
and the callout routines are allowed to sleep;
"Atomic" chains can be called from an atomic context and
the callout routines are not allowed to sleep.
We decided to codify this distinction and make it part of the API. Therefore
this set of patches introduces three new, parallel APIs: one for blocking
notifiers, one for atomic notifiers, and one for "raw" notifiers (which is
really just the old API under a new name). New kinds of data structures are
used for the heads of the chains, and new routines are defined for
registration, unregistration, and calling a chain. The three APIs are
explained in include/linux/notifier.h and their implementation is in
kernel/sys.c.
With atomic and blocking chains, the implementation guarantees that the chain
links will not be corrupted and that chain callers will not get messed up by
entries being added or removed. For raw chains the implementation provides no
guarantees at all; users of this API must provide their own protections. (The
idea was that situations may come up where the assumptions of the atomic and
blocking APIs are not appropriate, so it should be possible for users to
handle these things in their own way.)
There are some limitations, which should not be too hard to live with. For
atomic/blocking chains, registration and unregistration must always be done in
a process context since the chain is protected by a mutex/rwsem. Also, a
callout routine for a non-raw chain must not try to register or unregister
entries on its own chain. (This did happen in a couple of places and the code
had to be changed to avoid it.)
Since atomic chains may be called from within an NMI handler, they cannot use
spinlocks for synchronization. Instead we use RCU. The overhead falls almost
entirely in the unregister routine, which is okay since unregistration is much
less frequent that calling a chain.
Here is the list of chains that we adjusted and their classifications. None
of them use the raw API, so for the moment it is only a placeholder.
ATOMIC CHAINS
-------------
arch/i386/kernel/traps.c: i386die_chain
arch/ia64/kernel/traps.c: ia64die_chain
arch/powerpc/kernel/traps.c: powerpc_die_chain
arch/sparc64/kernel/traps.c: sparc64die_chain
arch/x86_64/kernel/traps.c: die_chain
drivers/char/ipmi/ipmi_si_intf.c: xaction_notifier_list
kernel/panic.c: panic_notifier_list
kernel/profile.c: task_free_notifier
net/bluetooth/hci_core.c: hci_notifier
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_chain
net/ipv4/netfilter/ip_conntrack_core.c: ip_conntrack_expect_chain
net/ipv6/addrconf.c: inet6addr_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_chain
net/netfilter/nf_conntrack_core.c: nf_conntrack_expect_chain
net/netlink/af_netlink.c: netlink_chain
BLOCKING CHAINS
---------------
arch/powerpc/platforms/pseries/reconfig.c: pSeries_reconfig_chain
arch/s390/kernel/process.c: idle_chain
arch/x86_64/kernel/process.c idle_notifier
drivers/base/memory.c: memory_chain
drivers/cpufreq/cpufreq.c cpufreq_policy_notifier_list
drivers/cpufreq/cpufreq.c cpufreq_transition_notifier_list
drivers/macintosh/adb.c: adb_client_list
drivers/macintosh/via-pmu.c sleep_notifier_list
drivers/macintosh/via-pmu68k.c sleep_notifier_list
drivers/macintosh/windfarm_core.c wf_client_list
drivers/usb/core/notify.c usb_notifier_list
drivers/video/fbmem.c fb_notifier_list
kernel/cpu.c cpu_chain
kernel/module.c module_notify_list
kernel/profile.c munmap_notifier
kernel/profile.c task_exit_notifier
kernel/sys.c reboot_notifier_list
net/core/dev.c netdev_chain
net/decnet/dn_dev.c: dnaddr_chain
net/ipv4/devinet.c: inetaddr_chain
It's possible that some of these classifications are wrong. If they are,
please let us know or submit a patch to fix them. Note that any chain that
gets called very frequently should be atomic, because the rwsem read-locking
used for blocking chains is very likely to incur cache misses on SMP systems.
(However, if the chain's callout routines may sleep then the chain cannot be
atomic.)
The patch set was written by Alan Stern and Chandra Seetharaman, incorporating
material written by Keith Owens and suggestions from Paul McKenney and Andrew
Morton.
[jes@sgi.com: restructure the notifier chain initialization macros]
Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-03-27 04:16:30 -05:00
|
|
|
blocking_notifier_call_chain(&sleep_notifier_list, PBOOK_WAKE, NULL);
|
2005-04-16 18:20:36 -04:00
|
|
|
|
|
|
|
|
/* reenable ADB autopoll */
|
|
|
|
|
pmu_adb_autopoll(adb_dev_map);
|
|
|
|
|
|
|
|
|
|
/* Turn on the screen backlight, if it was on before */
|
|
|
|
|
if (save_backlight)
|
|
|
|
|
pmu_enable_backlight(1);
|
|
|
|
|
|
|
|
|
|
/* Wait for the hard disk to spin up */
|
|
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Support for /dev/pmu device
|
|
|
|
|
*/
|
2005-09-17 11:36:54 -04:00
|
|
|
static int pmu_open(struct inode *inode, struct file *file)
|
2005-04-16 18:20:36 -04:00
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2005-09-17 11:36:54 -04:00
|
|
|
static ssize_t pmu_read(struct file *file, char *buf,
|
2005-04-16 18:20:36 -04:00
|
|
|
size_t count, loff_t *ppos)
|
|
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2005-09-17 11:36:54 -04:00
|
|
|
static ssize_t pmu_write(struct file *file, const char *buf,
|
2005-04-16 18:20:36 -04:00
|
|
|
size_t count, loff_t *ppos)
|
|
|
|
|
{
|
|
|
|
|
return 0;
|
|
|
|
|
}
|
|
|
|
|
|
2005-09-17 11:36:54 -04:00
|
|
|
static int pmu_ioctl(struct inode * inode, struct file *filp,
|
2005-04-16 18:20:36 -04:00
|
|
|
u_int cmd, u_long arg)
|
|
|
|
|
{
|
|
|
|
|
int error;
|
|
|
|
|
__u32 value;
|
|
|
|
|
|
|
|
|
|
switch (cmd) {
|
|
|
|
|
case PMU_IOC_SLEEP:
|
|
|
|
|
return -ENOSYS;
|
|
|
|
|
case PMU_IOC_GET_BACKLIGHT:
|
|
|
|
|
return put_user(backlight_level, (__u32 *)arg);
|
|
|
|
|
case PMU_IOC_SET_BACKLIGHT:
|
|
|
|
|
error = get_user(value, (__u32 *)arg);
|
|
|
|
|
if (!error)
|
|
|
|
|
pmu_set_brightness(value);
|
|
|
|
|
return error;
|
|
|
|
|
case PMU_IOC_GET_MODEL:
|
|
|
|
|
return put_user(pmu_kind, (__u32 *)arg);
|
|
|
|
|
}
|
|
|
|
|
return -EINVAL;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
static struct file_operations pmu_device_fops = {
|
|
|
|
|
.read = pmu_read,
|
|
|
|
|
.write = pmu_write,
|
|
|
|
|
.ioctl = pmu_ioctl,
|
|
|
|
|
.open = pmu_open,
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
static struct miscdevice pmu_device = {
|
|
|
|
|
PMU_MINOR, "pmu", &pmu_device_fops
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
void pmu_device_init(void)
|
|
|
|
|
{
|
|
|
|
|
if (!via)
|
|
|
|
|
return;
|
|
|
|
|
if (misc_register(&pmu_device) < 0)
|
|
|
|
|
printk(KERN_ERR "via-pmu68k: cannot register misc device.\n");
|
|
|
|
|
}
|
|
|
|
|
#endif /* CONFIG_PMAC_PBOOK */
|
|
|
|
|
|
