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, #TI81XXUART1       @ ti81Xx UART offsets different
  70                 beq     81f                     @ configure UART1
  71                 cmp     \rp, #TI81XXUART2       @ ti81Xx UART offsets different
  72                 beq     82f                     @ configure UART2
  73                 cmp     \rp, #TI81XXUART3       @ ti81Xx UART offsets different
  74                 beq     83f                     @ configure UART3
  75                 cmp     \rp, #AM33XXUART1       @ AM33XX UART offsets different
  76                 beq     84f                     @ configure UART1
  77                 cmp     \rp, #ZOOM_UART         @ only on zoom2/3
  78                 beq     95f                     @ configure ZOOM_UART
  79
  80                 /* Configure the UART offset from the phys/virt base */
  81 21:             mov     \rp, #UART_OFFSET(OMAP2_UART1_BASE)     @ omap2/3/4
  82                 b       98f
  83 22:             mov     \rp, #UART_OFFSET(OMAP2_UART2_BASE)     @ omap2/3/4
  84                 b       98f
  85 23:             mov     \rp, #UART_OFFSET(OMAP2_UART3_BASE)
  86                 b       98f
  87 33:             mov     \rp, #UART_OFFSET(OMAP3_UART1_BASE)
  88                 add     \rp, \rp, #0x00fb0000
  89                 add     \rp, \rp, #0x00006000           @ OMAP3_UART3_BASE
  90                 b       98f
  91 34:             mov     \rp, #UART_OFFSET(OMAP3_UART1_BASE)
  92                 add     \rp, \rp, #0x00fb0000
  93                 add     \rp, \rp, #0x00028000           @ OMAP3_UART4_BASE
  94                 b       98f
  95 43:             mov     \rp, #UART_OFFSET(OMAP4_UART3_BASE)
  96                 b       98f
  97 44:             mov     \rp, #UART_OFFSET(OMAP4_UART4_BASE)
  98                 b       98f
  99 81:             mov     \rp, #UART_OFFSET(TI81XX_UART1_BASE)
 100                 b       98f
 101 82:             mov     \rp, #UART_OFFSET(TI81XX_UART2_BASE)
 102                 b       98f
 103 83:             mov     \rp, #UART_OFFSET(TI81XX_UART3_BASE)
 104                 b       98f
 105 84:             ldr     \rp, =AM33XX_UART1_BASE
 106                 and     \rp, \rp, #0x00ffffff
 107                 b       97f
 108 95:             ldr     \rp, =ZOOM_UART_BASE
 109                 str     \rp, [\tmp, #0]         @ omap_uart_phys
 110                 ldr     \rp, =ZOOM_UART_VIRT
 111                 str     \rp, [\tmp, #4]         @ omap_uart_virt
 112                 mov     \rp, #(UART_LSR << ZOOM_PORT_SHIFT)
 113                 str     \rp, [\tmp, #8]         @ omap_uart_lsr
 114                 b       10b
 115
 116                 /* AM33XX: Store both phys and virt address for the uart */
 117 97:             add     \rp, \rp, #0x44000000   @ phys base
 118                 str     \rp, [\tmp, #0]         @ omap_uart_phys
 119                 sub     \rp, \rp, #0x44000000   @ phys base
 120                 add     \rp, \rp, #0xf9000000   @ virt base
 121                 str     \rp, [\tmp, #4]         @ omap_uart_virt
 122                 mov     \rp, #(UART_LSR << OMAP_PORT_SHIFT)
 123                 str     \rp, [\tmp, #8]         @ omap_uart_lsr
 124
 125                 b       10b
 126
 127                 /* Store both phys and virt address for the uart */
 128 98:             add     \rp, \rp, #0x48000000   @ phys base
 129                 str     \rp, [\tmp, #0]         @ omap_uart_phys
 130                 sub     \rp, \rp, #0x48000000   @ phys base
 131                 add     \rp, \rp, #0xfa000000   @ virt base
 132                 str     \rp, [\tmp, #4]         @ omap_uart_virt
 133                 mov     \rp, #(UART_LSR << OMAP_PORT_SHIFT)
 134                 str     \rp, [\tmp, #8]         @ omap_uart_lsr
 135
 136                 b       10b
 137
 138                 .align
 139 99:             .word   .
 140                 .word   omap_uart_phys
 141                 .ltorg
 142
 143 100:            /* Pass the UART_LSR reg address */
 144                 ldr     \tmp, [\tmp, #8]        @ omap_uart_lsr
 145                 add     \rp, \rp, \tmp
 146                 add     \rv, \rv, \tmp
 147                 .endm
 148
 149                 .macro  senduart,rd,rx
 150                 orr     \rd, \rd, \rx, lsl #24  @ preserve LSR reg offset
 151                 bic     \rx, \rx, #0xff         @ get base (THR) reg address
 152                 strb    \rd, [\rx]              @ send lower byte of rd
 153                 orr     \rx, \rx, \rd, lsr #24  @ restore original rx (LSR)
 154                 bic     \rd, \rd, #(0xff << 24) @ restore original rd
 155                 .endm
 156
 157                 .macro  busyuart,rd,rx
 158 1001:           ldrb    \rd, [\rx]              @ rx contains UART_LSR address
 159                 and     \rd, \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
 160                 teq     \rd, #(UART_LSR_TEMT | UART_LSR_THRE)
 161                 bne     1001b
 162                 .endm
 163
 164                 .macro  waituart,rd,rx
 165                 .endm