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Diffstat (limited to 'rbutil/mkamsboot/dualboot/dualboot.S')
-rw-r--r--rbutil/mkamsboot/dualboot/dualboot.S77
1 files changed, 73 insertions, 4 deletions
diff --git a/rbutil/mkamsboot/dualboot/dualboot.S b/rbutil/mkamsboot/dualboot/dualboot.S
index d1a9721f9f..8bb2059d78 100644
--- a/rbutil/mkamsboot/dualboot/dualboot.S
+++ b/rbutil/mkamsboot/dualboot/dualboot.S
@@ -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 */