You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
180 lines
4.7 KiB
180 lines
4.7 KiB
20 years ago
|
##=============================================================================
|
||
|
|
##
|
||
|
|
## 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 <asm/arch/hwregs/asm/reg_map_asm.h>
|
||
|
|
#include <asm/arch/hwregs/asm/gio_defs_asm.h>
|
||
|
|
#include <asm/arch/hwregs/asm/pinmux_defs_asm.h>
|
||
|
|
#include <asm/arch/hwregs/asm/bif_core_defs_asm.h>
|
||
|
|
#include <asm/arch/hwregs/asm/config_defs_asm.h>
|
||
|
|
#include <linux/config.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 adddress
|
||
|
|
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:
|