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firmware: Move more of the USB shutdown control to usb_enable/usb_disable

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- make sure USB resources are re-enabled before jumping to bootloader
- make sure all USB resources are disabled prior to jumping to user fw
This commit is contained in:
Ondrej Jirman 2021-08-02 10:03:48 +02:00
parent cea046008f
commit 134b4b6a8b
1 changed files with 58 additions and 33 deletions
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91
firmware/main.c
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@ -150,7 +150,7 @@ static __bit jump_to_usb_bootloader = 0;
uint8_t __idata __at(0xff) stock_flag = 1;
//XXX: check if we want to jump to user FW
static void usb_disable(void);
// cleanup after stock firmware and jump to user firmware
static void jmp_to_user_fw(void) __naked
@ -184,17 +184,10 @@ static void jmp_to_user_fw(void) __naked
P0_PRST = 0;
// disable USB and clear irq flags
PAGESW = 1;
P1_PHYTEST0 &= ~BIT(6); // phy disable
P1_UDCCTRL &= ~BIT(6); // udc disable
P1_UDCINT0STA = 0;
P1_UDCINT1STA = 0;
P1_UDCINT2STA = 0;
P1_UDCINT0EN = 0;
P1_UDCINT1EN = 0;
P1_UDCINT2EN = 0;
usb_disable();
// disable pullups, set all pins to input
PAGESW = 1;
P1_PHCON2 = 0;
P1_P9M0 = 0xffu;
PAGESW = 0;
@ -254,6 +247,24 @@ static void usb_bootloader_jump(void) __naked
P1_UDCINT1EN = 0;
P1_UDCINT2EN = 0;
// Bootloader would not enable these resources, so we need to make
// sure we enable them before jumping to it:
// USB on USB pins
P1_USBCTRL |= BIT(7);
// turn on PLL48
P1_UDCCTRL &= ~BIT(0);
// turn on USB resources (phy power up, PLL48 powerup)
P1_USBCTRL &= ~(BIT(0) | BIT(1));
// enable auto-tuning internal RC oscillator based on USB SOF packets
P1_IRCCTRL &= ~BIT(1); // disable manual trim
// wait for pll to stabilize
delay_us(5000);
// disable pullups, set all pins to input
P1_PHCON2 = 0;
P1_P9M0 = 0xffu;
@ -1611,6 +1622,21 @@ static void usb_init(void)
{
PAGESW = 1;
// USB on USB pins
P1_USBCTRL |= BIT(7);
// turn on PLL48
P1_UDCCTRL &= ~BIT(0);
// turn on USB resources (phy power up, PLL48 powerup)
P1_USBCTRL &= ~(BIT(0) | BIT(1));
// enable auto-tuning internal RC oscillator based on USB SOF packets
P1_IRCCTRL &= ~BIT(1); // disable manual trim
// wait for pll to stabilize
delay_us(5000);
P1_UDCCTRL |= BIT(6); // udc enable
// wait for UDC to complete initialization
while (!(P1_UDCCTRL & BIT(1)));
@ -1646,9 +1672,6 @@ static void usb_init(void)
P1_UDCINT0EN = BIT(5) | BIT(1) | BIT(6) | BIT(3);
P1_UDCINT1EN = BIT(0) | BIT(1) | BIT(2) | BIT(3) | BIT(4) | BIT(6);
P1_UDCINT2EN = BIT(2);
//P1_UDCINT0EN = 0;
//P1_UDCINT1EN = 0;
//P1_UDCINT2EN = 0;
// enable phy, wakeup enable
P1_PHYTEST0 |= BIT(5) | BIT(6);
@ -1665,11 +1688,32 @@ static void usb_init(void)
static void usb_disable(void)
{
// reset phy/usb
// disable USB interrupts
PAGESW = 0;
P0_EIE2 &= ~BIT(2);
PAGESW = 1;
// disable interrupts
P1_UDCINT0EN = 0;
P1_UDCINT1EN = 0;
P1_UDCINT2EN = 0;
// reset phy/usb
P1_PHYTEST0 &= ~(BIT(6) | BIT(5)); // phy disable
P1_UDCCTRL &= ~BIT(6); // udc disable
// turn off PLL48
P1_UDCCTRL |= BIT(0);
// turn off unused USB resources (phy power down, PLL48 powerdown
P1_USBCTRL |= BIT(0) | BIT(1);
// disable auto-tuning internal RC oscillator based on USB SOF packets
P1_IRCCTRL |= BIT(1); // enable manual trim
// GPIO on USB pins
P1_USBCTRL &= ~BIT(7);
}
// }}}
@ -1729,9 +1773,6 @@ void main(void)
PAGESW = 1;
P1_PHCON2 = 0x00;
// enable auto-tuning internal RC oscillator based on USB SOF packets
P1_IRCCTRL &= ~BIT(1); // disable manual trim
#if CONFIG_STOCK_FW
puts("ppkb firmware " FW_REVISION_STR " (stock)\n");
#else
@ -1744,22 +1785,6 @@ void main(void)
usb_disable();
#if !CONFIG_USB_STACK
PAGESW = 1;
// GPIO on USB pins
P1_USBCTRL &= ~BIT(7);
// turn off PLL48
P1_UDCCTRL |= BIT(0);
// turn off unused USB resources (phy power down, PLL48 powerdown
P1_USBCTRL |= BIT(0) | BIT(1);
// enable auto-tuning internal RC oscillator based on USB SOF packets
P1_IRCCTRL |= BIT(1); // enable manual trim
#endif
#if CONFIG_FLASH_ENABLE
for (uint8_t i = 0; i < 128; i++)
flash_content[i] = 0;