Make the meizu m3 load from flash, so interrupts work. More work is needed to get the m6sl "working" again

(patch by Denes Balatoni, FS#9499)


git-svn-id: svn://svn.rockbox.org/rockbox/trunk@18827 a1c6a512-1295-4272-9138-f99709370657

3 files changed, 382 insertions, 34 deletions

diff --git a/firmware/target/arm/s5l8700/boot.lds b/firmware/target/arm/s5l8700/boot.lds
index 8ce942c9b2..2d2a686f9d 100644
--- a/firmware/target/arm/s5l8700/boot.lds
+++ b/firmware/target/arm/s5l8700/boot.lds
@@ -1,12 +1,12 @@
 #include "config.h"
 
-ENTRY(start)
+ENTRY(_start)
 OUTPUT_FORMAT(elf32-bigarm)
 OUTPUT_ARCH(arm)
-STARTUP(target/arm/crt0.o)
+STARTUP(target/arm/s5l8700/crt0.o)
 
 /* DRAMORIG is in fact 0x8000000 but remapped to 0x0 */
-#define DRAMORIG 0x0
+#define DRAMORIG 0x8000000
 #define DRAMSIZE 16M
 
 #define IRAMORIG 0x22000000
@@ -22,41 +22,67 @@ STARTUP(target/arm/crt0.o)
 #define FLASHORIG 0x24000000
 #define FLASHSIZE 1M
 
+MEMORY
+{
+    DRAM  : ORIGIN = DRAMORIG, LENGTH = DRAMSIZE
+    IRAM  : ORIGIN = IRAMORIG, LENGTH = IRAMSIZE
+    FLASH : ORIGIN = FLASHORIG, LENGTH = FLASHSIZE
+}
+	
+
 SECTIONS
 {
-  /*. = IRAMORIG; */
-  /* As long as we don't flash the code, use the DFU load address */
-  . = DFULOADADDR;
+  .intvect : {
+    _intvectstart = . ;
+    *(.intvect)
+    _intvectend = _newstart ;  
+  } >IRAM AT> FLASH
+  _intvectcopy = LOADADDR(.intvect) ;
 
   .text : {
     *(.init.text)
     *(.text*)
-  }
+    *(.glue_7*)
+  } > FLASH
+
+  .rodata : {
+    *(.rodata*)
+    . = ALIGN(0x4);
+  } > FLASH
 
   .data : {
-    *(.icode)
+    _datastart = . ;
     *(.irodata)
+    *(.icode)
     *(.idata)
     *(.data*)
     *(.ncdata*);
+    . = ALIGN(0x4);
     _dataend = . ;
-   }
+   } > IRAM AT> FLASH
+   _datacopy = LOADADDR(.data) ;
 
   .stack :
   {
      *(.stack)
      _stackbegin = .;
-     stackbegin = .;
-     . += 0x1000;
+     . += 0x2000;
      _stackend = .;
-     stackend = .;
-  }
+     _irqstackbegin = .;
+     . += 0x400;
+     _irqstackend = .;
+     _fiqstackbegin = .;
+     . += 0x400;
+     _fiqstackend = .;
+  } > IRAM
 
   .bss : {
      _edata = .;
      *(.bss*);
      *(.ibss);
      *(.ncbss*);
+     *(COMMON);
+    . = ALIGN(0x4);
      _end = .;
-   }
+   } > IRAM
 }
diff --git a/firmware/target/arm/s5l8700/crt0.S b/firmware/target/arm/s5l8700/crt0.S
new file mode 100644
index 0000000000..0dcc203844
--- /dev/null
+++ b/firmware/target/arm/s5l8700/crt0.S
@@ -0,0 +1,320 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id: crt0.S 18776 2008-10-11 18:32:17Z gevaerts $
+ *
+ * Copyright (C) 2008 by Marcoen Hirschberg
+ * Copyright (C) 2008 by Denes Balatoni
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "config.h"
+#include "cpu.h"
+
+    .section .intvect,"ax",%progbits
+    .global    _start
+    .global    _newstart
+    /* Exception vectors */
+_start:
+    b _newstart
+    ldr pc, =undef_instr_handler
+    ldr pc, =software_int_handler
+    ldr pc, =prefetch_abort_handler
+    ldr pc, =data_abort_handler
+    ldr pc, =reserved_handler
+    ldr pc, =irq_handler
+    ldr pc, =fiq_handler
+#if CONFIG_CPU==S5L8700
+    .word 0x43554644 /* DFUC */
+#endif
+    .ltorg
+_newstart:
+    ldr pc, =newstart2 // we do not want to execute from 0x0 as iram will be mapped there
+    .section .init.text,"ax",%progbits
+newstart2:
+    msr     cpsr_c, #0xd3 /* enter supervisor mode, disable IRQ/FIQ */
+
+    mov r1, #0x80
+    mrc 15, 0, r0, c1, c0, 0
+    orr r0, r0, r1
+    mcr 15, 0, r0, c1, c0, 0 // set bigendian
+			 
+    ldr r1, =0x3c800000 // disable watchdog
+    mov r0, #0xa5
+    str r0, [r1]
+
+    mov r0, #0
+    ldr r1, =0x39c00008
+    str r0, [r1] // mask all interrupts
+    ldr r1, =0x39c00020
+    str r0, [r1] // mask all external interrupts
+    mvn r0, #0
+    mov r1, #0x39c00000
+    str r0, [r1] // irq priority
+    ldr r1, =0x39c00010
+    str r0, [r1] // clear pending interrupts
+    ldr r1, =0x39c0001c
+    str r0, [r1] // clear pending external interrupts
+									    
+//    ldr r1, =0x3cf00000
+//    ldr r0, [r1]
+//    mvn r2, #0x30
+//    and r0, r0, r2
+//    mov r2, #0x10
+//    orr r0, r0, r2
+//    str r0, [r1]
+//    ldr r1, =0x3cf00004
+//    ldr r0, [r1]
+//    mov r2, #4
+//    orr r0, r0, r2
+//    str r0, [r1] // switch backlight on
+
+    ldr r1, =0x3c500000 // CLKCON
+    ldr r0, =0x00800080
+    str r0, [r1]
+    ldr r1, =0x3c500024 // PLLCON
+    mov r0, #0
+    str r0, [r1]
+    ldr r1, =0x3c500004 // PLL0PMS
+    ldr r0, =0x1ad200
+    str r0, [r1]
+    ldr r1, =0x3c500014 // PLL0LCNT
+    ldr r0, =8100
+    str r0, [r1]
+    ldr r1, =0x3c500024 // PLLCON
+    mov r0, #1
+    str r0, [r1]
+    ldr r1, =0x3c500020 // PLLLOCK
+1:
+    ldr r0, [r1]
+    tst r0, #1
+    beq 1b
+    ldr r1, =0x3c50003c // CLKCON2
+    mov r0, #0x80
+    str r0, [r1]
+    ldr r1, =0x3c500000 // CLKCON
+    ldr r0, =0x20803180
+    str r0, [r1] // FCLK_CPU = 200MHz, HCLK = 100MHz, PCLK = 50MHz, other clocks off
+
+    ldr r2, =0xc0000078
+    mrc 15, 0, r0, c1, c0, 0
+    mvn r1, #0xc0000000
+    and r0, r0, r1
+    orr r0, r0, r2
+    mcr 15, 0, r0, c1, c0, 0 // asynchronous clocking mode
+    nop
+    nop					        
+    nop
+    nop
+
+//    ldr r0, =0x10100000
+//    ldr r1, =0x38200034
+//    str r0, [r1] // SRAM0/1 data width 16 bit
+//    ldr r0, =0x00220922
+//    ldr r7, =0x38200038
+//    str r0, [r7] // SRAM0/1 clocks
+//    ldr r0, =0x00220922
+//    ldr r9, =0x3820003c
+//    str r0, [r9] // SRAM2/3 clocks
+//    nop
+//    nop
+//    nop
+//    nop
+
+    ldr r1, =0x3c500000
+    mov r0, #0  // 0x0
+    str r0, [r1, #40] // enable clock for all peripherals
+    mov r0, #0  // 0x0
+    str r0, [r1, #44] // do not enter any power saving mode
+
+    mov r1, #0x1
+    mrc 15, 0, r0, c1, c0, 0
+    bic r0, r0, r1
+    mcr 15, 0, r0, c1, c0, 0 // disable protection unit
+
+    mov r1, #0x4
+    mrc 15, 0, r0, c1, c0, 0
+    bic r0, r0, r1
+    mcr 15, 0, r0, c1, c0, 0 // dcache disable
+
+    mov r1, #0x1000
+    mrc 15, 0, r0, c1, c0, 0
+    bic r0, r0, r1
+    mcr 15, 0, r0, c1, c0, 0 // icache disable
+
+    mov r1, #0
+1:
+    mov r0, #0
+2:
+    orr r2, r1, r0
+    mcr 15, 0, r2, c7, c14, 2 // clean and flush dcache single entry
+    add r0, r0, #0x10
+    cmp r0, #0x40
+    bne 2b
+    add r1, r1, #0x4000000
+    cmp r1, #0x0
+    bne 1b
+    nop
+    nop
+    mov r0, #0
+    mcr 15, 0, r0, c7, c10, 4 // clean and flush whole dcache
+									    
+    mov r0, #0
+    mcr 15, 0, r0, c7, c5, 0 // flush icache
+    
+    mov r0, #0
+    mcr 15, 0, r0, c7, c6, 0 // flush dcache
+			       
+    mov r0, #0x3f
+    mcr 15, 0, r0, c6, c0, 1
+    mov r0, #0x2f
+    mcr 15, 0, r0, c6, c1, 1
+    ldr r0, =0x0800002f
+    mcr 15, 0, r0, c6, c2, 1
+    ldr r0, =0x22000023
+    mcr 15, 0, r0, c6, c3, 1
+    ldr r0, =0x24000027
+    mcr 15, 0, r0, c6, c4, 1
+    mov r0, #0x3f
+    mcr 15, 0, r0, c6, c0, 0
+    mov r0, #0x2f
+    mcr 15, 0, r0, c6, c1, 0
+    ldr r0, =0x0800002f
+    mcr 15, 0, r0, c6, c2, 0
+    ldr r0, =0x22000023
+    mcr 15, 0, r0, c6, c3, 0
+    ldr r0, =0x24000029
+    mcr 15, 0, r0, c6, c4, 0
+    mov r0, #0x1e
+    mcr 15, 0, r0, c2, c0, 1
+    mov r0, #0x1e
+    mcr 15, 0, r0, c2, c0, 0
+    mov r0, #0x1e
+    mcr 15, 0, r0, c3, c0, 0
+    ldr r0, =0x0000ffff
+    mcr 15, 0, r0, c5, c0, 1
+    ldr r0, =0x0000ffff
+    mcr 15, 0, r0, c5, c0, 0 // set up protection and caching
+				    					
+    mov r1, #0x4
+    mrc 15, 0, r0, c1, c0, 0
+    orr r0, r0, r1
+    mcr 15, 0, r0, c1, c0, 0 // dcache enable
+    
+    mov r1, #0x1000
+    mrc 15, 0, r0, c1, c0, 0
+    orr r0, r0, r1
+    mcr 15, 0, r0, c1, c0, 0 // icache enable
+						   
+    mov r1, #0x1
+    mrc 15, 0, r0, c1, c0, 0
+    orr r0, r0, r1
+    mcr 15, 0, r0, c1, c0, 0 // enable protection unit
+
+    
+    /* Copy interrupt vectors to iram */
+    ldr     r2, =_intvectstart
+    ldr     r3, =_intvectend
+    ldr     r4, =_intvectcopy
+1:
+    cmp     r3, r2
+    ldrhi   r1, [r4], #4
+    strhi   r1, [r2], #4
+    bhi     1b
+
+    /* Initialise bss section to zero */
+    ldr     r2, =_edata
+    ldr     r3, =_end
+    mov     r4, #0
+1:
+    cmp     r3, r2
+    strhi   r4, [r2], #4
+    bhi     1b
+     
+    /* Copy icode and data to ram */
+    ldr     r2, =_datastart
+    ldr     r3, =_dataend
+    ldr     r4, =_datacopy
+1:
+    cmp     r3, r2
+    ldrhi   r1, [r4], #4
+    strhi   r1, [r2], #4
+    bhi     1b
+    
+    /* Set up some stack and munge it with 0xdeadbeef */
+    ldr     sp, =_stackend
+    ldr     r2, =_stackbegin
+    ldr     r3, =0xdeadbeef
+1:
+    cmp     sp, r2
+    strhi   r3, [r2], #4
+    bhi     1b
+    
+    /* Set up stack for IRQ mode */ 
+    msr     cpsr_c, #0xd2
+    ldr     sp, =_irqstackend
+
+    /* Set up stack for FIQ mode */ 
+    msr     cpsr_c, #0xd1
+    ldr     sp, =_fiqstackend
+
+    /* Let abort and undefined modes use IRQ stack */
+    msr     cpsr_c, #0xd7
+    ldr     sp, =_irqstackend
+    msr     cpsr_c, #0xdb
+    ldr     sp, =_irqstackend
+
+    /* Switch back to supervisor mode */
+    msr     cpsr_c, #0xd3
+
+// if we did not switch remap on, device
+// would crash when MENU is pressed,
+// as that button is connected to BOOT_MODE pin
+    ldr r1, =0x38200000
+    ldr r0, [r1]
+    mvn r2, #0x10000
+    and r0, r0, r2
+    mov r2, #0x1
+    orr r0, r0, r2
+    str r0, [r1] // remap iram to address 0x0
+
+    bl      main
+
+    .text
+/*    .global UIE*/
+
+/* All illegal exceptions call into UIE with exception address as first
+ * parameter. This is calculated differently depending on which exception
+ * we're in. Second parameter is exception number, used for a string lookup
+ * in UIE. */
+undef_instr_handler:
+    mov    r0, lr
+    mov    r1, #0
+    b      UIE
+
+/* We run supervisor mode most of the time, and should never see a software
+ * exception being thrown. Perhaps make it illegal and call UIE? */
+software_int_handler:
+reserved_handler:
+    movs   pc, lr
+
+prefetch_abort_handler:
+    sub    r0, lr, #4
+    mov    r1, #1
+    b      UIE
+
+data_abort_handler:
+    sub    r0, lr, #8 
+    mov    r1, #2
+    b      UIE
diff --git a/firmware/target/arm/s5l8700/meizu-m3/lcd-m3.c b/firmware/target/arm/s5l8700/meizu-m3/lcd-m3.c
index 624f2aa444..4b355302fd 100644
--- a/firmware/target/arm/s5l8700/meizu-m3/lcd-m3.c
+++ b/firmware/target/arm/s5l8700/meizu-m3/lcd-m3.c
@@ -69,7 +69,7 @@ void lcd_set_flip(bool yesno)
 static void lcd_sleep(uint32_t t)
 {
     volatile uint32_t i;
-    for(i=0;i<t;++i) t=t;
+    for(i=0;i<t;++i);
 }
 
 static uint8_t lcd_readdata()
@@ -115,6 +115,7 @@ void lcd_off() {
 void lcd_init_device(void)
 {
     uint8_t data[5];
+    int i;
 
 /* init basic things */
     PWRCON &= ~0x800;
@@ -126,25 +127,26 @@ void lcd_init_device(void)
     LCD_INTCON = 0;
     LCD_RST_TIME = 0x7ff;
 
-/* detect lcd type */
-    LCD_WCMD = 0x1;
-    lcd_sleep(166670);
-    LCD_WCMD = 0x11;
-    lcd_sleep(2000040);
-    lcd_readdata();
-    LCD_WCMD = 0x4;
-    lcd_sleep(100);
-    data[0]=lcd_readdata();
-    data[1]=lcd_readdata();
-    data[2]=lcd_readdata();
-    data[3]=lcd_readdata();
-    data[4]=lcd_readdata();
-    
-    lcd_type=0;
-    if (((data[1]==0x38) && ((data[2] & 0xf0) == 0x80)) ||
-        ((data[2]==0x38) && ((data[3] & 0xf0) == 0x80)))
-        lcd_type=1;
-    
+/* detect lcd type, it's not detected the first time for some reason */
+    for(i=0;i<3;++i) {
+	LCD_WCMD = 0x1;
+	lcd_sleep(166670);
+	LCD_WCMD = 0x11;
+	lcd_sleep(2000040);
+	lcd_readdata();
+	LCD_WCMD = 0x4;
+	lcd_sleep(100);
+	data[0]=lcd_readdata();
+	data[1]=lcd_readdata();
+	data[2]=lcd_readdata();
+	data[3]=lcd_readdata();
+	data[4]=lcd_readdata();
+
+	lcd_type=0;
+	if (((data[1]==0x38) && ((data[2] & 0xf0) == 0x80)) ||
+    	    ((data[2]==0x38) && ((data[3] & 0xf0) == 0x80)))
+    	    lcd_type=1;
+    }
 /* init lcd */
     if (lcd_type == 1) {
         LCD_WCMD = 0x3a;