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mkamsboot: Use audio master irq_enrd0 usb_status bit instead of gpio on C200V2

Browse source 
FlySpray: FS#11085
Author: Tobias Diedrich

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25088 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Rafaël Carré 2010-03-09 16:29:38 +00:00
parent 8d720f4d4e
commit 1f251ea30d
3 changed files with 91 additions and 16 deletions
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77
rbutil/mkamsboot/dualboot/dualboot.S
View file

@ -27,7 +27,26 @@
.set GPIOC, 0xC80D0000
.set GPIOD, 0xC80E0000
.set CGU_PERI, 0xC80F0014
.set I2C_BASE, 0xC8070000
.set I2C_DATA, 0x00
.set I2C_SLAD0, 0x04
.set I2C_CNTRL, 0x0c
.set I2C_DACNT, 0x10
.set I2C_CPSR0, 0x1c
.set I2C_CPSR1, 0x20
.set I2C_IMR, 0x24
.set I2C_SR, 0x30
.set I2C_SADDR, 0x44
.set AS3514_I2C_ADDR, 0x46
.set AS3514_IRQ_ENRD0, 0x25
.set PCLK, 24000000
.set I2C_CLK, 400000
.set I2C_PRESCALER, ((PCLK + I2C_CLK -1) / I2C_CLK)
.set I2C_PRESCALER_LOW, (I2C_PRESCALER & 0xff)
.set I2C_PRESCALER_HIGH, (I2C_PRESCALER >> 8)
#if I2C_PRESCALER_HIGH > 3
#error i2c prescaler too big!
#endif
/* Vectors */
@ -80,9 +99,7 @@ uclcopy:
/* TODO : M200V4 ? */
#if defined(SANSA_C200V2)
#define USB_PIN 1 /* FIXME: not correct on some c200v2s */
#elif defined(SANSA_CLIP) || defined(SANSA_CLIPV2)
#if defined(SANSA_CLIP) || defined(SANSA_CLIPV2)
#define USB_PIN 6
#elif defined(SANSA_FUZE) || defined(SANSA_E200V2) || defined(SANSA_FUZEV2)
#define USB_PIN 3
@ -96,6 +113,58 @@ uclcopy:
cmp r1, #0
bne boot_of
#endif
#if defined(SANSA_C200V2)
/* Instead of checking the GPIO, check the audio master IRQ_ENRD0
* USB_STATUS bit on C200V2 */
ldr r0, =CGU_PERI
ldr r1, [r0]
/* enable i2c audio master clock */
orr r1, r1, #(1<<17)
/* make sure 24MHz clk_main is selected */
bic r1, r1, #0x7f
str r1, [r0]
ldr r0, =I2C_BASE
/* disable i2c interrupts */
mov r1, #0
str r1, [r0, #I2C_IMR]
/* setup prescaler */
mov r1, #I2C_PRESCALER_LOW
str r1, [r0, #I2C_CPSR0]
mov r1, #I2C_PRESCALER_HIGH
str r1, [r0, #I2C_CPSR1]
/* setup i2c slave address */
mov r1, #(AS3514_I2C_ADDR << 1)
str r1, [r0, #I2C_SLAD0]
mov r2, #0x51
str r2, [r0, #I2C_CNTRL]
/* wait for not busy */
1:
ldr r1, [r0, #I2C_SR]
tst r1, #1
bne 1b
/* start read of irq_enrd0 */
mov r1, #AS3514_IRQ_ENRD0
str r1, [r0, #I2C_SADDR]
orr r2, r2, #(1 << 1)
str r2, [r0, #I2C_CNTRL]
mov r1, #1
str r1, [r0, #I2C_DACNT]
/* wait for transfer to finish */
1:
ldr r1, [r0, #I2C_DACNT]
cmp r1, #0
bne 1b
/* load result and test USB_STATUS bit */
ldr r1, [r0, #I2C_DATA]
tst r1, #(1 << 3)
bne boot_of
#endif
/* Here are model specific tests, for dual boot without a computer */
/* All models use left button */