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linux/sound/pci/pcxhr/pcxhr_core.h
David Howells 7d12e780e0 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 15:10:12 +01:00

201 lines
6.7 KiB
C
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/*
* Driver for Digigram pcxhr compatible soundcards
*
* low level interface with interrupt ans message handling
*
* Copyright (c) 2004 by Digigram <alsa@digigram.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __SOUND_PCXHR_CORE_H
#define __SOUND_PCXHR_CORE_H
struct firmware;
struct pcxhr_mgr;
/* init and firmware download commands */
void pcxhr_reset_xilinx_com(struct pcxhr_mgr *mgr);
void pcxhr_reset_dsp(struct pcxhr_mgr *mgr);
void pcxhr_enable_dsp(struct pcxhr_mgr *mgr);
int pcxhr_load_xilinx_binary(struct pcxhr_mgr *mgr, const struct firmware *xilinx, int second);
int pcxhr_load_eeprom_binary(struct pcxhr_mgr *mgr, const struct firmware *eeprom);
int pcxhr_load_boot_binary(struct pcxhr_mgr *mgr, const struct firmware *boot);
int pcxhr_load_dsp_binary(struct pcxhr_mgr *mgr, const struct firmware *dsp);
/* DSP time available on MailBox4 register : 24 bit time samples() */
#define PCXHR_DSP_TIME_MASK 0x00ffffff
#define PCXHR_DSP_TIME_INVALID 0x10000000
#define PCXHR_SIZE_MAX_CMD 8
#define PCXHR_SIZE_MAX_STATUS 16
#define PCXHR_SIZE_MAX_LONG_STATUS 256
struct pcxhr_rmh {
u16 cmd_len; /* length of the command to send (WORDs) */
u16 stat_len; /* length of the status received (WORDs) */
u16 dsp_stat; /* status type, RMP_SSIZE_XXX */
u16 cmd_idx; /* index of the command */
u32 cmd[PCXHR_SIZE_MAX_CMD];
u32 stat[PCXHR_SIZE_MAX_STATUS];
};
enum {
CMD_VERSION, /* cmd_len = 2 stat_len = 1 */
CMD_SUPPORTED, /* cmd_len = 1 stat_len = 4 */
CMD_TEST_IT, /* cmd_len = 1 stat_len = 1 */
CMD_SEND_IRQA, /* cmd_len = 1 stat_len = 0 */
CMD_ACCESS_IO_WRITE, /* cmd_len >= 1 stat_len >= 1 */
CMD_ACCESS_IO_READ, /* cmd_len >= 1 stat_len >= 1 */
CMD_ASYNC, /* cmd_len = 1 stat_len = 1 */
CMD_MODIFY_CLOCK, /* cmd_len = 3 stat_len = 0 */
CMD_RESYNC_AUDIO_INPUTS, /* cmd_len = 1 stat_len = 0 */
CMD_GET_DSP_RESOURCES, /* cmd_len = 1 stat_len = 4 */
CMD_SET_TIMER_INTERRUPT, /* cmd_len = 1 stat_len = 0 */
CMD_RES_PIPE, /* cmd_len = 2 stat_len = 0 */
CMD_FREE_PIPE, /* cmd_len = 1 stat_len = 0 */
CMD_CONF_PIPE, /* cmd_len = 2 stat_len = 0 */
CMD_STOP_PIPE, /* cmd_len = 1 stat_len = 0 */
CMD_PIPE_SAMPLE_COUNT, /* cmd_len = 2 stat_len = 2 */
CMD_CAN_START_PIPE, /* cmd_len >= 1 stat_len = 1 */
CMD_START_STREAM, /* cmd_len = 2 stat_len = 0 */
CMD_STREAM_OUT_LEVEL_ADJUST, /* cmd_len >= 1 stat_len = 0 */
CMD_STOP_STREAM, /* cmd_len = 2 stat_len = 0 */
CMD_UPDATE_R_BUFFERS, /* cmd_len = 4 stat_len = 0 */
CMD_FORMAT_STREAM_OUT, /* cmd_len >= 2 stat_len = 0 */
CMD_FORMAT_STREAM_IN, /* cmd_len >= 4 stat_len = 0 */
CMD_STREAM_SAMPLE_COUNT, /* cmd_len = 2 stat_len = (2 * nb_stream) */
CMD_AUDIO_LEVEL_ADJUST, /* cmd_len = 3 stat_len = 0 */
CMD_LAST_INDEX
};
#define MASK_DSP_WORD 0x00ffffff
#define MASK_ALL_STREAM 0x00ffffff
#define MASK_DSP_WORD_LEVEL 0x000001ff
#define MASK_FIRST_FIELD 0x0000001f
#define FIELD_SIZE 5
/*
init the rmh struct; by default cmd_len is set to 1
*/
void pcxhr_init_rmh(struct pcxhr_rmh *rmh, int cmd);
void pcxhr_set_pipe_cmd_params(struct pcxhr_rmh* rmh, int capture, unsigned int param1,
unsigned int param2, unsigned int param3);
/*
send the rmh
*/
int pcxhr_send_msg(struct pcxhr_mgr *mgr, struct pcxhr_rmh *rmh);
/* values used for CMD_ACCESS_IO_WRITE and CMD_ACCESS_IO_READ */
#define IO_NUM_REG_CONT 0
#define IO_NUM_REG_GENCLK 1
#define IO_NUM_REG_MUTE_OUT 2
#define IO_NUM_SPEED_RATIO 4
#define IO_NUM_REG_STATUS 5
#define IO_NUM_REG_CUER 10
#define IO_NUM_UER_CHIP_REG 11
#define IO_NUM_REG_OUT_ANA_LEVEL 20
#define IO_NUM_REG_IN_ANA_LEVEL 21
#define REG_CONT_UNMUTE_INPUTS 0x020000
/* parameters used with register IO_NUM_REG_STATUS */
#define REG_STATUS_OPTIONS 0
#define REG_STATUS_AES_SYNC 8
#define REG_STATUS_AES_1 9
#define REG_STATUS_AES_2 10
#define REG_STATUS_AES_3 11
#define REG_STATUS_AES_4 12
#define REG_STATUS_WORD_CLOCK 13
#define REG_STATUS_INTER_SYNC 14
#define REG_STATUS_CURRENT 0x80
/* results */
#define REG_STATUS_OPT_NO_VIDEO_SIGNAL 0x01
#define REG_STATUS_OPT_DAUGHTER_MASK 0x1c
#define REG_STATUS_OPT_ANALOG_BOARD 0x00
#define REG_STATUS_OPT_NO_DAUGHTER 0x1c
#define REG_STATUS_OPT_COMPANION_MASK 0xe0
#define REG_STATUS_OPT_NO_COMPANION 0xe0
#define REG_STATUS_SYNC_32000 0x00
#define REG_STATUS_SYNC_44100 0x01
#define REG_STATUS_SYNC_48000 0x02
#define REG_STATUS_SYNC_64000 0x03
#define REG_STATUS_SYNC_88200 0x04
#define REG_STATUS_SYNC_96000 0x05
#define REG_STATUS_SYNC_128000 0x06
#define REG_STATUS_SYNC_176400 0x07
#define REG_STATUS_SYNC_192000 0x08
int pcxhr_set_pipe_state(struct pcxhr_mgr *mgr, int playback_mask, int capture_mask, int start);
int pcxhr_write_io_num_reg_cont(struct pcxhr_mgr *mgr, unsigned int mask,
unsigned int value, int *changed);
/* codec parameters */
#define CS8416_RUN 0x200401
#define CS8416_FORMAT_DETECT 0x200b00
#define CS8416_CSB0 0x201900
#define CS8416_CSB1 0x201a00
#define CS8416_CSB2 0x201b00
#define CS8416_CSB3 0x201c00
#define CS8416_CSB4 0x201d00
#define CS8416_VERSION 0x207f00
#define CS8420_DATA_FLOW_CTL 0x200301
#define CS8420_CLOCK_SRC_CTL 0x200401
#define CS8420_RECEIVER_ERRORS 0x201000
#define CS8420_SRC_RATIO 0x201e00
#define CS8420_CSB0 0x202000
#define CS8420_CSB1 0x202100
#define CS8420_CSB2 0x202200
#define CS8420_CSB3 0x202300
#define CS8420_CSB4 0x202400
#define CS8420_VERSION 0x207f00
#define CS4271_MODE_CTL_1 0x200101
#define CS4271_DAC_CTL 0x200201
#define CS4271_VOLMIX 0x200301
#define CS4271_VOLMUTE_LEFT 0x200401
#define CS4271_VOLMUTE_RIGHT 0x200501
#define CS4271_ADC_CTL 0x200601
#define CS4271_MODE_CTL_2 0x200701
#define CHIP_SIG_AND_MAP_SPI 0xff7f00
/* codec selection */
#define CS4271_01_CS 0x160018
#define CS4271_23_CS 0x160019
#define CS4271_45_CS 0x16001a
#define CS4271_67_CS 0x16001b
#define CS4271_89_CS 0x16001c
#define CS4271_AB_CS 0x16001d
#define CS8420_01_CS 0x080090
#define CS8420_23_CS 0x080092
#define CS8420_45_CS 0x080094
#define CS8420_67_CS 0x080096
#define CS8416_01_CS 0x080098
/* interrupt handling */
irqreturn_t pcxhr_interrupt(int irq, void *dev_id);
void pcxhr_msg_tasklet(unsigned long arg);
#endif /* __SOUND_PCXHR_CORE_H */
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