arch/m68k/include/asm/mac_psc.h - arm/linux - Git at Google

 /*
  * Apple Peripheral System Controller (PSC)
  *
  * The PSC is used on the AV Macs to control IO functions not handled
  * by the VIAs (Ethernet, DSP, SCC, Sound). This includes nine DMA
  * channels.
  *
  * The first seven DMA channels appear to be "one-shot" and are actually
  * sets of two channels; one member is active while the other is being
  * configured, and then you flip the active member and start all over again.
  * The one-shot channels are grouped together and are:
  *
  * 1. SCSI
  * 2. Ethernet Read
  * 3. Ethernet Write
  * 4. Floppy Disk Controller
  * 5. SCC Channel A Receive
  * 6. SCC Channel B Receive
  * 7. SCC Channel A Transmit
  *
  * The remaining two channels are handled somewhat differently. They appear
  * to be closely tied and share one set of registers. They also seem to run
  * continuously, although how you keep the buffer filled in this scenario is
  * not understood as there seems to be only one input and one output buffer
  * pointer.
  *
  * Much of this was extrapolated from what was known about the Ethernet
  * registers and subsequently confirmed using MacsBug (ie by pinging the
  * machine with easy-to-find patterns and looking for them in the DMA
  * buffers, or by sending a file over the serial ports and finding the
  * file in the buffers.)
  *
  * 1999-05-25 (jmt)
  */

 #define PSC_BASE	(0x50F31000)

 /*
  * The IER/IFR registers work like the VIA, except that it has 4
  * of them each on different interrupt levels, and each register
  * set only seems to handle four interrupts instead of seven.
  *
  * To access a particular set of registers, add 0xn0 to the base
  * where n = 3,4,5 or 6.
  */

 #define pIFRbase	0x100
 #define pIERbase	0x104

 /*
  * One-shot DMA control registers
  */

 #define PSC_MYSTERY	0x804

 #define PSC_CTL_BASE	0xC00

 #define PSC_SCSI_CTL	0xC00
 #define PSC_ENETRD_CTL  0xC10
 #define PSC_ENETWR_CTL  0xC20
 #define PSC_FDC_CTL	0xC30
 #define PSC_SCCA_CTL	0xC40
 #define PSC_SCCB_CTL	0xC50
 #define PSC_SCCATX_CTL	0xC60

 /*
  * DMA channels. Add +0x10 for the second channel in the set.
  * You're supposed to use one channel while the other runs and
  * then flip channels and do the whole thing again.
  */

 #define PSC_ADDR_BASE	0x1000
 #define PSC_LEN_BASE	0x1004
 #define PSC_CMD_BASE	0x1008

 #define PSC_SET0	0x00
 #define PSC_SET1	0x10

 #define PSC_SCSI_ADDR	0x1000	/* confirmed */
 #define PSC_SCSI_LEN	0x1004	/* confirmed */
 #define PSC_SCSI_CMD	0x1008	/* confirmed */
 #define PSC_ENETRD_ADDR 0x1020	/* confirmed */
 #define PSC_ENETRD_LEN  0x1024	/* confirmed */
 #define PSC_ENETRD_CMD  0x1028	/* confirmed */
 #define PSC_ENETWR_ADDR 0x1040	/* confirmed */
 #define PSC_ENETWR_LEN  0x1044	/* confirmed */
 #define PSC_ENETWR_CMD  0x1048	/* confirmed */
 #define PSC_FDC_ADDR	0x1060	/* strongly suspected */
 #define PSC_FDC_LEN	0x1064	/* strongly suspected */
 #define PSC_FDC_CMD	0x1068	/* strongly suspected */
 #define PSC_SCCA_ADDR	0x1080	/* confirmed */
 #define PSC_SCCA_LEN	0x1084	/* confirmed */
 #define PSC_SCCA_CMD	0x1088	/* confirmed */
 #define PSC_SCCB_ADDR	0x10A0	/* confirmed */
 #define PSC_SCCB_LEN	0x10A4	/* confirmed */
 #define PSC_SCCB_CMD	0x10A8	/* confirmed */
 #define PSC_SCCATX_ADDR	0x10C0	/* confirmed */
 #define PSC_SCCATX_LEN	0x10C4	/* confirmed */
 #define PSC_SCCATX_CMD	0x10C8	/* confirmed */

 /*
  * Free-running DMA registers. The only part known for sure are the bits in
  * the control register, the buffer addresses and the buffer length. Everything
  * else is anybody's guess.
  *
  * These registers seem to be mirrored every thirty-two bytes up until offset
  * 0x300. It's safe to assume then that a new set of registers starts there.
  */

 #define PSC_SND_CTL	0x200	/*
 				 * [ 16-bit ]
 				 * Sound (Singer?) control register.
 				 *
 				 * bit 0  : ????
 				 * bit 1  : ????
 				 * bit 2  : Set to one to enable sound
 				 *          output. Possibly a mute flag.
 				 * bit 3  : ????
 				 * bit 4  : ????
 				 * bit 5  : ????
 				 * bit 6  : Set to one to enable pass-thru
 				 *          audio. In this mode the audio data
 				 *          seems to appear in both the input
 				 *          buffer and the output buffer.
 				 * bit 7  : Set to one to activate the
 				 *          sound input DMA or zero to
 				 *          disable it.
 				 * bit 8  : Set to one to activate the
 				 *          sound output DMA or zero to
 				 *          disable it.
 				 * bit 9  : \
 				 * bit 11 :  |
 				 *          These two bits control the sample
 				 *          rate. Usually set to binary 10 and
 				 *	    MacOS 8.0 says I'm at 48 KHz. Using
 				 *	    a binary value of 01 makes things
 				 *	    sound about 1/2 speed (24 KHz?) and
 				 *          binary 00 is slower still (22 KHz?)
 				 *
 				 * Setting this to 0x0000 is a good way to
 				 * kill all DMA at boot time so that the
 				 * PSC won't overwrite the kernel image
 				 * with sound data.
 				 */

 /*
  * 0x0202 - 0x0203 is unused. Writing there
  * seems to clobber the control register.
  */

 #define PSC_SND_SOURCE	0x204	/*
 				 * [ 32-bit ]
 				 * Controls input source and volume:
 				 *
 				 * bits 12-15 : input source volume, 0 - F
 				 * bits 16-19 : unknown, always 0x5
 				 * bits 20-23 : input source selection:
 				 *                  0x3 = CD Audio
 				 *                  0x4 = External Audio
 				 *
 				 * The volume is definitely not the general
 				 * output volume as it doesn't affect the
 				 * alert sound volume.
 				 */
 #define PSC_SND_STATUS1	0x208	/*
 				 * [ 32-bit ]
 				 * Appears to be a read-only status register.
 				 * The usual value is 0x00400002.
 				 */
 #define PSC_SND_HUH3	0x20C	/*
 				 * [ 16-bit ]
 				 * Unknown 16-bit value, always 0x0000.
 				 */
 #define PSC_SND_BITS2GO	0x20E	/*
 				 * [ 16-bit ]
 				 * Counts down to zero from some constant
 				 * value. The value appears to be the
 				 * number of _bits_ remaining before the
 				 * buffer is full, which would make sense
 				 * since Apple's docs say the sound DMA
 				 * channels are 1 bit wide.
 				 */
 #define PSC_SND_INADDR	0x210	/*
 				 * [ 32-bit ]
 				 * Address of the sound input DMA buffer
 				 */
 #define PSC_SND_OUTADDR	0x214	/*
 				 * [ 32-bit ]
 				 * Address of the sound output DMA buffer
 				 */
 #define PSC_SND_LEN	0x218	/*
 				 * [ 16-bit ]
 				 * Length of both buffers in eight-byte units.
 				 */
 #define PSC_SND_HUH4	0x21A	/*
 				 * [ 16-bit ]
 				 * Unknown, always 0x0000.
 				 */
 #define PSC_SND_STATUS2	0x21C	/*
 				 * [ 16-bit ]
 				 * Appears to e a read-only status register.
 				 * The usual value is 0x0200.
 				 */
 #define PSC_SND_HUH5	0x21E	/*
 				 * [ 16-bit ]
 				 * Unknown, always 0x0000.
 				 */

 #ifndef __ASSEMBLY__

 extern volatile __u8 *psc;

 extern void psc_register_interrupts(void);
 extern void psc_irq_enable(int);
 extern void psc_irq_disable(int);

 /*
  *	Access functions
  */

 static inline void psc_write_byte(int offset, __u8 data)
 {
 	*((volatile __u8 *)(psc + offset)) = data;
 }

 static inline void psc_write_word(int offset, __u16 data)
 {
 	*((volatile __u16 *)(psc + offset)) = data;
 }

 static inline void psc_write_long(int offset, __u32 data)
 {
 	*((volatile __u32 *)(psc + offset)) = data;
 }

 static inline u8 psc_read_byte(int offset)
 {
 	return *((volatile __u8 *)(psc + offset));
 }

 static inline u16 psc_read_word(int offset)
 {
 	return *((volatile __u16 *)(psc + offset));
 }

 static inline u32 psc_read_long(int offset)
 {
 	return *((volatile __u32 *)(psc + offset));
 }

 #endif /* __ASSEMBLY__ */
	/*
	* Apple Peripheral System Controller (PSC)
	*
	* The PSC is used on the AV Macs to control IO functions not handled
	* by the VIAs (Ethernet, DSP, SCC, Sound). This includes nine DMA
	* channels.
	*
	* The first seven DMA channels appear to be "one-shot" and are actually
	* sets of two channels; one member is active while the other is being
	* configured, and then you flip the active member and start all over again.
	* The one-shot channels are grouped together and are:
	*
	* 1. SCSI
	* 2. Ethernet Read
	* 3. Ethernet Write
	* 4. Floppy Disk Controller
	* 5. SCC Channel A Receive
	* 6. SCC Channel B Receive
	* 7. SCC Channel A Transmit
	*
	* The remaining two channels are handled somewhat differently. They appear
	* to be closely tied and share one set of registers. They also seem to run
	* continuously, although how you keep the buffer filled in this scenario is
	* not understood as there seems to be only one input and one output buffer
	* pointer.
	*
	* Much of this was extrapolated from what was known about the Ethernet
	* registers and subsequently confirmed using MacsBug (ie by pinging the
	* machine with easy-to-find patterns and looking for them in the DMA
	* buffers, or by sending a file over the serial ports and finding the
	* file in the buffers.)
	*
	* 1999-05-25 (jmt)
	*/

	#define PSC_BASE (0x50F31000)

	/*
	* The IER/IFR registers work like the VIA, except that it has 4
	* of them each on different interrupt levels, and each register
	* set only seems to handle four interrupts instead of seven.
	*
	* To access a particular set of registers, add 0xn0 to the base
	* where n = 3,4,5 or 6.
	*/

	#define pIFRbase 0x100
	#define pIERbase 0x104

	/*
	* One-shot DMA control registers
	*/

	#define PSC_MYSTERY 0x804

	#define PSC_CTL_BASE 0xC00

	#define PSC_SCSI_CTL 0xC00
	#define PSC_ENETRD_CTL 0xC10
	#define PSC_ENETWR_CTL 0xC20
	#define PSC_FDC_CTL 0xC30
	#define PSC_SCCA_CTL 0xC40
	#define PSC_SCCB_CTL 0xC50
	#define PSC_SCCATX_CTL 0xC60

	/*
	* DMA channels. Add +0x10 for the second channel in the set.
	* You're supposed to use one channel while the other runs and
	* then flip channels and do the whole thing again.
	*/

	#define PSC_ADDR_BASE 0x1000
	#define PSC_LEN_BASE 0x1004
	#define PSC_CMD_BASE 0x1008

	#define PSC_SET0 0x00
	#define PSC_SET1 0x10

	#define PSC_SCSI_ADDR 0x1000 /* confirmed */
	#define PSC_SCSI_LEN 0x1004 /* confirmed */
	#define PSC_SCSI_CMD 0x1008 /* confirmed */
	#define PSC_ENETRD_ADDR 0x1020 /* confirmed */
	#define PSC_ENETRD_LEN 0x1024 /* confirmed */
	#define PSC_ENETRD_CMD 0x1028 /* confirmed */
	#define PSC_ENETWR_ADDR 0x1040 /* confirmed */
	#define PSC_ENETWR_LEN 0x1044 /* confirmed */
	#define PSC_ENETWR_CMD 0x1048 /* confirmed */
	#define PSC_FDC_ADDR 0x1060 /* strongly suspected */
	#define PSC_FDC_LEN 0x1064 /* strongly suspected */
	#define PSC_FDC_CMD 0x1068 /* strongly suspected */
	#define PSC_SCCA_ADDR 0x1080 /* confirmed */
	#define PSC_SCCA_LEN 0x1084 /* confirmed */
	#define PSC_SCCA_CMD 0x1088 /* confirmed */
	#define PSC_SCCB_ADDR 0x10A0 /* confirmed */
	#define PSC_SCCB_LEN 0x10A4 /* confirmed */
	#define PSC_SCCB_CMD 0x10A8 /* confirmed */
	#define PSC_SCCATX_ADDR 0x10C0 /* confirmed */
	#define PSC_SCCATX_LEN 0x10C4 /* confirmed */
	#define PSC_SCCATX_CMD 0x10C8 /* confirmed */

	/*
	* Free-running DMA registers. The only part known for sure are the bits in
	* the control register, the buffer addresses and the buffer length. Everything
	* else is anybody's guess.
	*
	* These registers seem to be mirrored every thirty-two bytes up until offset
	* 0x300. It's safe to assume then that a new set of registers starts there.
	*/

	#define PSC_SND_CTL 0x200 /*
	* [ 16-bit ]
	* Sound (Singer?) control register.
	*
	* bit 0 : ????
	* bit 1 : ????
	* bit 2 : Set to one to enable sound
	* output. Possibly a mute flag.
	* bit 3 : ????
	* bit 4 : ????
	* bit 5 : ????
	* bit 6 : Set to one to enable pass-thru
	* audio. In this mode the audio data
	* seems to appear in both the input
	* buffer and the output buffer.
	* bit 7 : Set to one to activate the
	* sound input DMA or zero to
	* disable it.
	* bit 8 : Set to one to activate the
	* sound output DMA or zero to
	* disable it.
	* bit 9 : \
	* bit 11 : \|
	* These two bits control the sample
	* rate. Usually set to binary 10 and
	* MacOS 8.0 says I'm at 48 KHz. Using
	* a binary value of 01 makes things
	* sound about 1/2 speed (24 KHz?) and
	* binary 00 is slower still (22 KHz?)
	*
	* Setting this to 0x0000 is a good way to
	* kill all DMA at boot time so that the
	* PSC won't overwrite the kernel image
	* with sound data.
	*/

	/*
	* 0x0202 - 0x0203 is unused. Writing there
	* seems to clobber the control register.
	*/

	#define PSC_SND_SOURCE 0x204 /*
	* [ 32-bit ]
	* Controls input source and volume:
	*
	* bits 12-15 : input source volume, 0 - F
	* bits 16-19 : unknown, always 0x5
	* bits 20-23 : input source selection:
	* 0x3 = CD Audio
	* 0x4 = External Audio
	*
	* The volume is definitely not the general
	* output volume as it doesn't affect the
	* alert sound volume.
	*/
	#define PSC_SND_STATUS1 0x208 /*
	* [ 32-bit ]
	* Appears to be a read-only status register.
	* The usual value is 0x00400002.
	*/
	#define PSC_SND_HUH3 0x20C /*
	* [ 16-bit ]
	* Unknown 16-bit value, always 0x0000.
	*/
	#define PSC_SND_BITS2GO 0x20E /*
	* [ 16-bit ]
	* Counts down to zero from some constant
	* value. The value appears to be the
	* number of _bits_ remaining before the
	* buffer is full, which would make sense
	* since Apple's docs say the sound DMA
	* channels are 1 bit wide.
	*/
	#define PSC_SND_INADDR 0x210 /*
	* [ 32-bit ]
	* Address of the sound input DMA buffer
	*/
	#define PSC_SND_OUTADDR 0x214 /*
	* [ 32-bit ]
	* Address of the sound output DMA buffer
	*/
	#define PSC_SND_LEN 0x218 /*
	* [ 16-bit ]
	* Length of both buffers in eight-byte units.
	*/
	#define PSC_SND_HUH4 0x21A /*
	* [ 16-bit ]
	* Unknown, always 0x0000.
	*/
	#define PSC_SND_STATUS2 0x21C /*
	* [ 16-bit ]
	* Appears to e a read-only status register.
	* The usual value is 0x0200.
	*/
	#define PSC_SND_HUH5 0x21E /*
	* [ 16-bit ]
	* Unknown, always 0x0000.
	*/

	#ifndef __ASSEMBLY__

	extern volatile __u8 *psc;

	extern void psc_register_interrupts(void);
	extern void psc_irq_enable(int);
	extern void psc_irq_disable(int);

	/*
	* Access functions
	*/

	static inline void psc_write_byte(int offset, __u8 data)
	{
	((volatile __u8 )(psc + offset)) = data;
	}

	static inline void psc_write_word(int offset, __u16 data)
	{
	((volatile __u16 )(psc + offset)) = data;
	}

	static inline void psc_write_long(int offset, __u32 data)
	{
	((volatile __u32 )(psc + offset)) = data;
	}

	static inline u8 psc_read_byte(int offset)
	{
	return ((volatile __u8 )(psc + offset));
	}

	static inline u16 psc_read_word(int offset)
	{
	return ((volatile __u16 )(psc + offset));
	}

	static inline u32 psc_read_long(int offset)
	{
	return ((volatile __u32 )(psc + offset));
	}

	#endif /* __ASSEMBLY__ */