cris: remove arch/cris/arch-v32/lib/nand_init.S

Commit 3f50c067 ("CRIS v32: Update
boot/rescue/head.S code") removed the last reference to that file. So
this file is unused since v2.6.25.

Signed-off-by: Paul Bolle <pebolle@tiscali.nl>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

arch/cris/arch-v32/lib/nand_init.S

-##=============================================================================
-##
-##      nand_init.S
-##
-##      The bootrom copies data from the NAND flash to the internal RAM but
-##      due to a bug/feature we can only trust the 256 first bytes. So this
-##      code copies more data from NAND flash to internal RAM. Obvioulsy this
-##      code must fit in the first 256 bytes so alter with care.
-##
-##	Some notes about the bug/feature for future reference:
-##        The bootrom copies the first 127 KB from NAND flash to internal
-##        memory. The problem is that it does a bytewise copy. NAND flashes
-##        does autoincrement on the address so for a 16-bite device each
-##        read/write increases the address by two. So the copy loop in the
-##        bootrom will discard every second byte. This is solved by inserting
-##        zeroes in every second byte in the first erase block.
-##
-##        The bootrom also incorrectly assumes that it can read the flash
-##        linear with only one read command but the flash will actually
-##        switch between normal area and spare area if you do that so we
-##        can't trust more than the first 256 bytes.
-##
-##=============================================================================
-
-#include <arch/hwregs/asm/reg_map_asm.h>
-#include <arch/hwregs/asm/gio_defs_asm.h>
-#include <arch/hwregs/asm/pinmux_defs_asm.h>
-#include <arch/hwregs/asm/bif_core_defs_asm.h>
-#include <arch/hwregs/asm/config_defs_asm.h>
-
-;; There are 8-bit NAND flashes and 16-bit NAND flashes.
-;; We need to treat them slightly different.
-#if CONFIG_ETRAX_FLASH_BUSWIDTH==2
-#define PAGE_SIZE 256
-#else
-#error 2
-#define PAGE_SIZE 512
-#endif
-#define ERASE_BLOCK 16384
-
-;; GPIO pins connected to NAND flash
-#define CE 4
-#define CLE 5
-#define ALE 6
-#define BY 7
-
-;; Address space for NAND flash
-#define NAND_RD_ADDR 0x90000000
-#define NAND_WR_ADDR 0x94000000
-
-#define READ_CMD 0x00
-
-;; Readability macros
-#define CSP_MASK \
-	REG_MASK(bif_core, rw_grp3_cfg, gated_csp0) | \
-	REG_MASK(bif_core, rw_grp3_cfg, gated_csp1)
-#define CSP_VAL \
-	REG_STATE(bif_core, rw_grp3_cfg, gated_csp0, rd) | \
-	REG_STATE(bif_core, rw_grp3_cfg, gated_csp1, wr)
-
-;;----------------------------------------------------------------------------
-;; Macros to set/clear GPIO bits
-
-.macro SET x
-	or.b   (1<<\x),$r9
-	move.d $r9, [$r2]
-.endm
-
-.macro CLR x
-	and.b  ~(1<<\x),$r9
-	move.d $r9, [$r2]
-.endm
-
-;;----------------------------------------------------------------------------
-
-nand_boot:
-	;; Check if nand boot was selected
-	move.d REG_ADDR(config, regi_config, r_bootsel), $r0
-	move.d [$r0], $r0
-	and.d  REG_MASK(config, r_bootsel, boot_mode), $r0
-	cmp.d  REG_STATE(config, r_bootsel, boot_mode, nand), $r0
-	bne normal_boot ; No NAND boot
-	nop
-
-copy_nand_to_ram:
-	;; copy_nand_to_ram
-	;; Arguments
-	;;   r10 - destination
-	;;   r11 - source offset
-	;;   r12 - size
-	;;   r13 - Address to jump to after completion
-	;; Note : r10-r12 are clobbered on return
-	;; Registers used:
-	;;   r0 - NAND_RD_ADDR
-	;;   r1 - NAND_WR_ADDR
-	;;   r2 - reg_gio_rw_pa_dout
-	;;   r3 - reg_gio_r_pa_din
-	;;   r4 - tmp
-	;;   r5 - byte counter within a page
-	;;   r6 - reg_pinmux_rw_pa
-	;;   r7 - reg_gio_rw_pa_oe
-	;;   r8 - reg_bif_core_rw_grp3_cfg
-	;;   r9 - reg_gio_rw_pa_dout shadow
-	move.d 0x90000000, $r0
-	move.d 0x94000000, $r1
-	move.d REG_ADDR(gio, regi_gio, rw_pa_dout), $r2
-	move.d REG_ADDR(gio, regi_gio, r_pa_din), $r3
-	move.d REG_ADDR(pinmux, regi_pinmux, rw_pa), $r6
-	move.d REG_ADDR(gio, regi_gio, rw_pa_oe), $r7
-	move.d REG_ADDR(bif_core, regi_bif_core, rw_grp3_cfg), $r8
-
-#if CONFIG_ETRAX_FLASH_BUSWIDTH==2
-	lsrq	1, $r11
-#endif
-	;; Set up GPIO
-	move.d [$r2], $r9
-	move.d [$r7], $r4
-	or.b (1<<ALE) | (1 << CLE) | (1<<CE), $r4
-	move.d $r4, [$r7]
-
-	;; Set up bif
-	move.d [$r8], $r4
-	and.d CSP_MASK, $r4
-	or.d CSP_VAL, $r4
-	move.d $r4, [$r8]
-
-1:	;; Copy one page
-	CLR CE
-	SET CLE
-	moveq	READ_CMD, $r4
-	move.b	$r4, [$r1]
-	moveq	20, $r4
-2:	bne	2b
-	subq	1, $r4
-	CLR CLE
-	SET ALE
-	clear.w [$r1] 		; Column address = 0
-	move.d	$r11, $r4
-	lsrq	8, $r4
-	move.b	$r4, [$r1]	; Row address
-	lsrq	8, $r4
-	move.b	$r4, [$r1]	; Row address
-	moveq	20, $r4
-2:	bne	2b
-	subq	1, $r4
-	CLR ALE
-2:	move.d	[$r3], $r4
-	and.d	1 << BY, $r4
-	beq 2b
-	movu.w  PAGE_SIZE, $r5
-2:	; Copy one byte/word
-#if CONFIG_ETRAX_FLASH_BUSWIDTH==2
-	move.w  [$r0], $r4
-#else
-	move.b  [$r0], $r4
-#endif
-	subq	1, $r5
-	bne	2b
-#if CONFIG_ETRAX_FLASH_BUSWIDTH==2
-	move.w  $r4, [$r10+]
-	subu.w	PAGE_SIZE*2, $r12
-#else
-	move.b  $r4, [$r10+]
-	subu.w	PAGE_SIZE, $r12
-#endif
-	bpl	1b
-	addu.w	PAGE_SIZE, $r11
-
-	;; End of copy
-	jump	$r13
-	nop
-
-	;; This will warn if the code above is too large. If you consider
-	;; to remove this you don't understand the bug/feature.
-	.org 256
-	.org ERASE_BLOCK
-
-normal_boot: