arch/arm/mach-omap2/include/mach/debug-macro.S

   1 /* arch/arm/mach-omap2/include/mach/debug-macro.S
   2  *
   3  * Debugging macro include header
   4  *
   5  *  Copyright (C) 1994-1999 Russell King
   6  *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12 */
  13
  14 #include <linux/serial_reg.h>
  15
  16 #include <plat/serial.h>
  17
  18 #define UART_OFFSET(addr)       ((addr) & 0x00ffffff)
  19
  20                 .pushsection .data
  21 omap_uart_phys: .word   0
  22 omap_uart_virt: .word   0
  23 omap_uart_lsr:  .word   0
  24                 .popsection
  25
  26                 /*
  27                  * Note that this code won't work if the bootloader passes
  28                  * a wrong machine ID number in r1. To debug, just hardcode
  29                  * the desired UART phys and virt addresses temporarily into
  30                  * the omap_uart_phys and omap_uart_virt above.
  31                  */
  32                 .macro  addruart, rp, rv, tmp
  33
  34                 /* Use omap_uart_phys/virt if already configured */
  35 10:             adr     \rp, 99f                @ get effective addr of 99f
  36                 ldr     \rv, [\rp]              @ get absolute addr of 99f
  37                 sub     \rv, \rv, \rp           @ offset between the two
  38                 ldr     \rp, [\rp, #4]          @ abs addr of omap_uart_phys
  39                 sub     \tmp, \rp, \rv          @ make it effective
  40                 ldr     \rp, [\tmp, #0]         @ omap_uart_phys
  41                 ldr     \rv, [\tmp, #4]         @ omap_uart_virt
  42                 cmp     \rp, #0                 @ is port configured?
  43                 cmpne   \rv, #0
  44                 bne     100f                    @ already configured
  45
  46                 /* Check the debug UART configuration set in uncompress.h */
  47                 mov     \rp, pc
  48                 ldr     \rv, =OMAP_UART_INFO_OFS
  49                 and     \rp, \rp, #0xff000000
  50                 ldr     \rp, [\rp, \rv]
  51
  52                 /* Select the UART to use based on the UART1 scratchpad value */
  53                 cmp     \rp, #0                 @ no port configured?
  54                 beq     21f                     @ if none, try to use UART1
  55                 cmp     \rp, #OMAP2UART1        @ OMAP2/3/4UART1
  56                 beq     21f                     @ configure OMAP2/3/4UART1
  57                 cmp     \rp, #OMAP2UART2        @ OMAP2/3/4UART2
  58                 beq     22f                     @ configure OMAP2/3/4UART2
  59                 cmp     \rp, #OMAP2UART3        @ only on 24xx
  60                 beq     23f                     @ configure OMAP2UART3
  61                 cmp     \rp, #OMAP3UART3        @ only on 34xx
  62                 beq     33f                     @ configure OMAP3UART3
  63                 cmp     \rp, #OMAP4UART3        @ only on 44xx
  64                 beq     43f                     @ configure OMAP4UART3
  65                 cmp     \rp, #OMAP3UART4        @ only on 36xx
  66                 beq     34f                     @ configure OMAP3UART4
  67                 cmp     \rp, #OMAP4UART4        @ only on 44xx
  68                 beq     44f                     @ configure OMAP4UART4
  69                 cmp     \rp, #TI816XUART1       @ ti816x UART offsets different
  70                 beq     81f                     @ configure UART1
  71                 cmp     \rp, #TI816XUART2       @ ti816x UART offsets different
  72                 beq     82f                     @ configure UART2
  73                 cmp     \rp, #TI816XUART3       @ ti816x UART offsets different
  74                 beq     83f                     @ configure UART3
  75                 cmp     \rp, #ZOOM_UART         @ only on zoom2/3
  76                 beq     95f                     @ configure ZOOM_UART
  77
  78                 /* Configure the UART offset from the phys/virt base */
  79 21:             mov     \rp, #UART_OFFSET(OMAP2_UART1_BASE)     @ omap2/3/4
  80                 b       98f
  81 22:             mov     \rp, #UART_OFFSET(OMAP2_UART2_BASE)     @ omap2/3/4
  82                 b       98f
  83 23:             mov     \rp, #UART_OFFSET(OMAP2_UART3_BASE)
  84                 b       98f
  85 33:             mov     \rp, #UART_OFFSET(OMAP3_UART1_BASE)
  86                 add     \rp, \rp, #0x00fb0000
  87                 add     \rp, \rp, #0x00006000           @ OMAP3_UART3_BASE
  88                 b       98f
  89 34:             mov     \rp, #UART_OFFSET(OMAP3_UART1_BASE)
  90                 add     \rp, \rp, #0x00fb0000
  91                 add     \rp, \rp, #0x00028000           @ OMAP3_UART4_BASE
  92                 b       98f
  93 43:             mov     \rp, #UART_OFFSET(OMAP4_UART3_BASE)
  94                 b       98f
  95 44:             mov     \rp, #UART_OFFSET(OMAP4_UART4_BASE)
  96                 b       98f
  97 81:             mov     \rp, #UART_OFFSET(TI816X_UART1_BASE)
  98                 b       98f
  99 82:             mov     \rp, #UART_OFFSET(TI816X_UART2_BASE)
 100                 b       98f
 101 83:             mov     \rp, #UART_OFFSET(TI816X_UART3_BASE)
 102                 b       98f
 103
 104 95:             ldr     \rp, =ZOOM_UART_BASE
 105                 str     \rp, [\tmp, #0]         @ omap_uart_phys
 106                 ldr     \rp, =ZOOM_UART_VIRT
 107                 str     \rp, [\tmp, #4]         @ omap_uart_virt
 108                 mov     \rp, #(UART_LSR << ZOOM_PORT_SHIFT)
 109                 str     \rp, [\tmp, #8]         @ omap_uart_lsr
 110                 b       10b
 111
 112                 /* Store both phys and virt address for the uart */
 113 98:             add     \rp, \rp, #0x48000000   @ phys base
 114                 str     \rp, [\tmp, #0]         @ omap_uart_phys
 115                 sub     \rp, \rp, #0x48000000   @ phys base
 116                 add     \rp, \rp, #0xfa000000   @ virt base
 117                 str     \rp, [\tmp, #4]         @ omap_uart_virt
 118                 mov     \rp, #(UART_LSR << OMAP_PORT_SHIFT)
 119                 str     \rp, [\tmp, #8]         @ omap_uart_lsr
 120
 121                 b       10b
 122
 123                 .align
 124 99:             .word   .
 125                 .word   omap_uart_phys
 126                 .ltorg
 127
 128 100:            /* Pass the UART_LSR reg address */
 129                 ldr     \tmp, [\tmp, #8]        @ omap_uart_lsr
 130                 add     \rp, \rp, \tmp
 131                 add     \rv, \rv, \tmp
 132                 .endm
 133
 134                 .macro  senduart,rd,rx
 135                 orr     \rd, \rd, \rx, lsl #24  @ preserve LSR reg offset
 136                 bic     \rx, \rx, #0xff         @ get base (THR) reg address
 137                 strb    \rd, [\rx]              @ send lower byte of rd
 138                 orr     \rx, \rx, \rd, lsr #24  @ restore original rx (LSR)
 139                 bic     \rd, \rd, #(0xff << 24) @ restore original rd
 140                 .endm
 141
 142                 .macro  busyuart,rd,rx
 143 1001:           ldrb    \rd, [\rx]              @ rx contains UART_LSR address
 144                 and     \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
 145                 teq     \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
 146                 bne     1001b
 147                 .endm
 148
 149                 .macro  waituart,rd,rx
 150                 .endm