/* fuc microcode util functions for nvc0 PGRAPH
 *
 * Copyright 2011 Red Hat Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Ben Skeggs
 */

#ifdef INCLUDE_CODE
// queue_put - add request to queue
//
// In : $r13 queue pointer
//	$r14 command
//	$r15 data
//
queue_put:
	// make sure we have space..
	ld b32 $r8 D[$r13 + 0x0]	// GET
	ld b32 $r9 D[$r13 + 0x4]	// PUT
	xor $r8 8
	cmpu b32 $r8 $r9
	bra ne #queue_put_next
		mov $r15 E_CMD_OVERFLOW
		call(error)
		ret

	// store cmd/data on queue
	queue_put_next:
	and $r8 $r9 7
	shl b32 $r8 3
	add b32 $r8 $r13
	add b32 $r8 8
	st b32 D[$r8 + 0x0] $r14
	st b32 D[$r8 + 0x4] $r15

	// update PUT
	add b32 $r9 1
	and $r9 0xf
	st b32 D[$r13 + 0x4] $r9
	ret

// queue_get - fetch request from queue
//
// In : $r13 queue pointer
//
// Out:	$p1  clear on success (data available)
//	$r14 command
// 	$r15 data
//
queue_get:
	bset $flags $p1
	ld b32 $r8 D[$r13 + 0x0]	// GET
	ld b32 $r9 D[$r13 + 0x4]	// PUT
	cmpu b32 $r8 $r9
	bra e #queue_get_done
		// fetch first cmd/data pair
		and $r9 $r8 7
		shl b32 $r9 3
		add b32 $r9 $r13
		add b32 $r9 8
		ld b32 $r14 D[$r9 + 0x0]
		ld b32 $r15 D[$r9 + 0x4]

		// update GET
		add b32 $r8 1
		and $r8 0xf
		st b32 D[$r13 + 0x0] $r8
		bclr $flags $p1
queue_get_done:
	ret

// nv_rd32 - read 32-bit value from nv register
//
// In : $r14 register
// Out: $r15 value
//
nv_rd32:
	mov b32 $r12 $r14
	bset $r12 31			// MMIO_CTRL_PENDING
	nv_iowr(NV_PGRAPH_FECS_MMIO_CTRL, 0, $r12)
	nv_rd32_wait:
		nv_iord($r12, NV_PGRAPH_FECS_MMIO_CTRL, 0)
		xbit $r12 $r12 31
		bra ne #nv_rd32_wait
	mov $r10 6			// DONE_MMIO_RD
	call(wait_doneo)
	nv_iord($r15, NV_PGRAPH_FECS_MMIO_RDVAL, 0)
	ret

// nv_wr32 - write 32-bit value to nv register
//
// In : $r14 register
//      $r15 value
//
nv_wr32:
	nv_iowr(NV_PGRAPH_FECS_MMIO_WRVAL, 0, $r15)
	mov b32 $r12 $r14
	bset $r12 31			// MMIO_CTRL_PENDING
	bset $r12 30			// MMIO_CTRL_WRITE
	nv_iowr(NV_PGRAPH_FECS_MMIO_CTRL, 0, $r12)
	nv_wr32_wait:
		nv_iord($r12, NV_PGRAPH_FECS_MMIO_CTRL, 0)
		xbit $r12 $r12 31
		bra ne #nv_wr32_wait
	ret

// wait_donez - wait on FUC_DONE bit to become clear
//
// In : $r10 bit to wait on
//
wait_donez:
	trace_set(T_WAIT);
	nv_iowr(NV_PGRAPH_FECS_CC_SCRATCH_VAL(6), 0, $r10)
	wait_donez_ne:
		nv_iord($r8, NV_PGRAPH_FECS_SIGNAL, 0)
		xbit $r8 $r8 $r10
		bra ne #wait_donez_ne
	trace_clr(T_WAIT)
	ret

// wait_doneo - wait on FUC_DONE bit to become set
//
// In : $r10 bit to wait on
//
wait_doneo:
	trace_set(T_WAIT);
	nv_iowr(NV_PGRAPH_FECS_CC_SCRATCH_VAL(6), 0, $r10)
	wait_doneo_e:
		nv_iord($r8, NV_PGRAPH_FECS_SIGNAL, 0)
		xbit $r8 $r8 $r10
		bra e #wait_doneo_e
	trace_clr(T_WAIT)
	ret

// mmctx_size - determine size of a mmio list transfer
//
// In : $r14 mmio list head
//      $r15 mmio list tail
// Out: $r15 transfer size (in bytes)
//
mmctx_size:
	clear b32 $r9
	nv_mmctx_size_loop:
		ld b32 $r8 D[$r14]
		shr b32 $r8 26
		add b32 $r8 1
		shl b32 $r8 2
		add b32 $r9 $r8
		add b32 $r14 4
		cmpu b32 $r14 $r15
		bra ne #nv_mmctx_size_loop
	mov b32 $r15 $r9
	ret

// mmctx_xfer - execute a list of mmio transfers
//
// In : $r10 flags
//		bit 0: direction (0 = save, 1 = load)
//		bit 1: set if first transfer
//		bit 2: set if last transfer
//	$r11 base
//	$r12 mmio list head
//	$r13 mmio list tail
//	$r14 multi_stride
//	$r15 multi_mask
//
mmctx_xfer:
	trace_set(T_MMCTX)
	clear b32 $r9
	or $r11 $r11
	bra e #mmctx_base_disabled
		nv_iowr(NV_PGRAPH_FECS_MMCTX_BASE, 0, $r11)
		bset $r9 0			// BASE_EN
	mmctx_base_disabled:
	or $r14 $r14
	bra e #mmctx_multi_disabled
		nv_iowr(NV_PGRAPH_FECS_MMCTX_MULTI_STRIDE, 0, $r14)
		nv_iowr(NV_PGRAPH_FECS_MMCTX_MULTI_MASK, 0, $r15)
		bset $r9 1			// MULTI_EN
	mmctx_multi_disabled:

	xbit $r11 $r10 0
	shl b32 $r11 16			// DIR
	bset $r11 12			// QLIMIT = 0x10
	xbit $r14 $r10 1
	shl b32 $r14 17
	or $r11 $r14			// START_TRIGGER
	nv_iowr(NV_PGRAPH_FECS_MMCTX_CTRL, 0, $r11)

	// loop over the mmio list, and send requests to the hw
	mmctx_exec_loop:
		// wait for space in mmctx queue
		mmctx_wait_free:
			nv_iord($r14, NV_PGRAPH_FECS_MMCTX_CTRL, 0)
			and $r14 0x1f
			bra e #mmctx_wait_free

		// queue up an entry
		ld b32 $r14 D[$r12]
		or $r14 $r9
		nv_iowr(NV_PGRAPH_FECS_MMCTX_QUEUE, 0, $r14)
		add b32 $r12 4
		cmpu b32 $r12 $r13
		bra ne #mmctx_exec_loop

	xbit $r11 $r10 2
	bra ne #mmctx_stop
		// wait for queue to empty
		mmctx_fini_wait:
			nv_iord($r11, NV_PGRAPH_FECS_MMCTX_CTRL, 0)
			and $r11 0x1f
			cmpu b32 $r11 0x10
			bra ne #mmctx_fini_wait
		mov $r10 5			// DONE_MMCTX
		call(wait_donez)
		bra #mmctx_done
	mmctx_stop:
		xbit $r11 $r10 0
		shl b32 $r11 16			// DIR
		bset $r11 12			// QLIMIT = 0x10
		bset $r11 18			// STOP_TRIGGER
		nv_iowr(NV_PGRAPH_FECS_MMCTX_CTRL, 0, $r11)
		mmctx_stop_wait:
			// wait for STOP_TRIGGER to clear
			nv_iord($r11, NV_PGRAPH_FECS_MMCTX_CTRL, 0)
			xbit $r11 $r11 18
			bra ne #mmctx_stop_wait
	mmctx_done:
	trace_clr(T_MMCTX)
	ret

// Wait for DONE_STRAND
//
strand_wait:
	push $r10
	mov $r10 2
	call(wait_donez)
	pop $r10
	ret

// unknown - call before issuing strand commands
//
strand_pre:
	mov $r9 NV_PGRAPH_FECS_STRAND_CMD_ENABLE
	nv_iowr(NV_PGRAPH_FECS_STRAND_CMD, 0x3f, $r9)
	call(strand_wait)
	ret

// unknown - call after issuing strand commands
//
strand_post:
	mov $r9 NV_PGRAPH_FECS_STRAND_CMD_DISABLE
	nv_iowr(NV_PGRAPH_FECS_STRAND_CMD, 0x3f, $r9)
	call(strand_wait)
	ret

// Selects strand set?!
//
// In: $r14 id
//
strand_set:
	mov $r12 0xf
	nv_iowr(NV_PGRAPH_FECS_STRAND_FILTER, 0x3f, $r12)
	mov $r12 NV_PGRAPH_FECS_STRAND_CMD_DEACTIVATE_FILTER
	nv_iowr(NV_PGRAPH_FECS_STRAND_CMD, 0x3f, $r12)
	nv_iowr(NV_PGRAPH_FECS_STRAND_FILTER, 0x3f, $r14)
	mov $r12 NV_PGRAPH_FECS_STRAND_CMD_ACTIVATE_FILTER
	nv_iowr(NV_PGRAPH_FECS_STRAND_CMD, 0x3f, $r12)
	call(strand_wait)
	ret

// Initialise strand context data
//
// In : $r15 context base
// Out: $r15 context size (in bytes)
//
// Strandset(?) 3 hardcoded currently
//
strand_ctx_init:
	trace_set(T_STRINIT)
	call(strand_pre)
	mov $r14 3
	call(strand_set)

	clear b32 $r12
	nv_iowr(NV_PGRAPH_FECS_STRAND_SELECT, 0x3f, $r12)
	mov $r12 NV_PGRAPH_FECS_STRAND_CMD_SEEK
	nv_iowr(NV_PGRAPH_FECS_STRAND_CMD, 0x3f, $r12)
	call(strand_wait)
	sub b32 $r12 $r0 1
	nv_iowr(NV_PGRAPH_FECS_STRAND_DATA, 0x3f, $r12)
	mov $r12 NV_PGRAPH_FECS_STRAND_CMD_GET_INFO
	nv_iowr(NV_PGRAPH_FECS_STRAND_CMD, 0x3f, $r12)
	call(strand_wait)
	call(strand_post)

	// read the size of each strand, poke the context offset of
	// each into STRAND_{SAVE,LOAD}_SWBASE now, no need to worry
	// about it later then.
	nv_mkio($r8, NV_PGRAPH_FECS_STRAND_SAVE_SWBASE, 0x00)
	nv_iord($r9, NV_PGRAPH_FECS_STRANDS_CNT, 0x00)
	shr b32 $r14 $r15 8
	ctx_init_strand_loop:
		iowr I[$r8 + 0x000] $r14	// STRAND_SAVE_SWBASE
		iowr I[$r8 + 0x100] $r14	// STRAND_LOAD_SWBASE
		iord $r10 I[$r8 + 0x200]	// STRAND_SIZE
		shr b32 $r10 6
		add b32 $r10 1
		add b32 $r14 $r10
		add b32 $r8 4
		sub b32 $r9 1
		bra ne #ctx_init_strand_loop

	shl b32 $r14 8
	sub b32 $r15 $r14 $r15
	trace_clr(T_STRINIT)
	ret
#endif