diff options
Diffstat (limited to 'cf-code/cf-fsi-fw.S')
| -rw-r--r-- | cf-code/cf-fsi-fw.S | 76 |
1 files changed, 48 insertions, 28 deletions
diff --git a/cf-code/cf-fsi-fw.S b/cf-code/cf-fsi-fw.S index aa6a388..b771b79 100644 --- a/cf-code/cf-fsi-fw.S +++ b/cf-code/cf-fsi-fw.S @@ -161,13 +161,37 @@ _vecs: .endr /* - * Main entry point + * Header info */ .org 0x400 +_header_info: + .short SYS_SIG /* 0x00 */ + .short FW_VERSION /* 0x02 */ + .byte API_VERSION_MAJ /* 0x04 */ + .byte API_VERSION_MIN /* 0x05 */ + .byte 0,0 /* 0x06 pad */ +#ifdef ENABLE_TRACE + .long FW_OPTION_TRACE_EN /* 0x08 */ +#else + .long 0 +#endif + + /* + * Config area + */ + .org 0x400 + HDR_CMD_STAT_AREA +_cmd_stat_base: + .long SRAM_BASE_BE + + /* + * Main entry point + */ + .org 0x500 .global _start _start: /* Get base addresses */ - movea.l #SRAM_BASE_BE,%a1 + lea %pc@(_cmd_stat_base),%a0 + movea.l %a0@(0),%a1 movea.l #GPIO_BASE,%a4 movea.l %a4,%a5 add.l #CLOCK_GPIO_VREG,%a5 @@ -240,18 +264,8 @@ _start: /* Configure GPIOs to output */ bsr config_gpio_out - /* Populate version & signature */ - move.w #SYS_SIG,%a1@(SYS_SIG_REG) - move.b #FW_VERSION,%a1@(FW_VERS_REG) - - /* This must happen last as it's the signal to the host - * that we are ready - */ -#ifdef ENABLE_TRACE - move.b #(API_VERSION + API_VERSION_TRACE_EN),%a1@(API_VERS_REG) -#else - move.b #API_VERSION,%a1@(API_VERS_REG) -#endif + /* Mark command complete, indicates we are ready */ + move.b #STAT_COMPLETE,%a1@(CMD_STAT_REG) /* * Main command loop @@ -266,7 +280,7 @@ main_loop: */ 1: move.b %a1@(ARB_REG),%d2 bne arbitration_request - move.l %a1@(CMD_REG),%d2 + move.l %a1@(CMD_STAT_REG),%d2 tst.b %d2 bne command_request stop #0x2000 @@ -301,11 +315,9 @@ command_request: /* Mask interrupts */ move.w #0x2007,%sr - /* Mark ourselves as sending a command */ - move.b #STAT_SENDING,%a1@(STAT_REG) - - /* Clear command register */ - move.b #CMD_NONE,%a1@(CMD_REG + 3) + /* Clear the command/status register */ + moveq.l #0,%d0 + move.l %d0,%a1@(CMD_STAT_REG) /* Start command ? */ cmpi.b #CMD_COMMAND,%d2 @@ -320,7 +332,7 @@ command_request: beq start_idle_clocks /* Error */ - move.b #STAT_ERR_INVAL_CMD,%a1@(STAT_REG) + move.b #STAT_ERR_INVAL_CMD,%a1@(CMD_STAT_REG) bra main_loop /* @@ -389,7 +401,7 @@ start_command: beq 1f subq.l #1,%d3 bne 0b - move.b #STAT_ERR_MTOE,%a1@(STAT_REG) + move.b #STAT_ERR_MTOE,%a1@(CMD_STAT_REG) bra send_delay 1: /* Got start bit, clock in slave ID and response tag */ @@ -454,7 +466,9 @@ start_command: move.b %d4,%a1@(STAT_RCRC) /* Mark command complete */ - move.b #STAT_COMPLETE,%a1@(STAT_REG) + moveq.l #STAT_COMPLETE,%d0 + byterev %d0 + move.l %d0,%a1@(CMD_STAT_REG) send_delay: /* Send delay after every command */ @@ -485,8 +499,11 @@ start_break: move.l #FSI_POST_BREAK_CLOCKS,%d3 clock_out_zeros %d3 - /* That's it */ - move.b #STAT_COMPLETE,%a1@(STAT_REG) + /* Mark command complete */ + moveq.l #STAT_COMPLETE,%d0 + byterev %d0 + move.l %d0,%a1@(CMD_STAT_REG) + bra main_loop start_idle_clocks: @@ -498,8 +515,11 @@ start_idle_clocks: move.b %d2,%d3 clock_out_zeros %d3 - /* That's it */ - move.b #STAT_COMPLETE,%a1@(STAT_REG) + /* Mark command complete */ + moveq.l #STAT_COMPLETE,%d0 + byterev %d0 + move.l %d0,%a1@(CMD_STAT_REG) + bra main_loop config_gpio_out: @@ -549,7 +569,7 @@ bad_exception: sub.l %d1,%d0 lsr.l #2,%d0 move.b %d0,%a1@(BAD_INT_VEC) - move.b #STAT_ERR_INVAL_IRQ,%a1@(STAT_REG) + move.b #STAT_ERR_INVAL_IRQ,%a1@(CMD_STAT_REG) halt /* Bad exception stubs */ |
