diff options
Diffstat (limited to 'firmware/src/simtrace/iso7816_uart.c')
| -rw-r--r-- | firmware/src/simtrace/iso7816_uart.c | 44 |
1 files changed, 32 insertions, 12 deletions
diff --git a/firmware/src/simtrace/iso7816_uart.c b/firmware/src/simtrace/iso7816_uart.c index 9022830..6ed797c 100644 --- a/firmware/src/simtrace/iso7816_uart.c +++ b/firmware/src/simtrace/iso7816_uart.c @@ -11,6 +11,7 @@ #include <os/usb_handler.h> #include <os/dbgu.h> +#include <os/pio_irq.h> #include "../simtrace.h" #include "../openpcd.h" @@ -111,14 +112,18 @@ static void set_atr_state(struct iso7816_3_handle *ih, enum atr_state new_atrs) static void set_state(struct iso7816_3_handle *ih, enum iso7816_3_state new_state) { - if (new_state == ISO7816_S_WAIT_ATR) { + if (new_state == ISO7816_S_RESET) { + usart->US_CR |= AT91C_US_RXDIS | AT91C_US_RSTRX; + } else if (new_state == ISO7816_S_WAIT_ATR) { int rc; /* Initial Fi / Di ratio */ ih->fi = 1; ih->di = 1; rc = compute_fidi_ratio(ih->fi, ih->di); DEBUGPCRF("computed Fi(%u) Di(%u) ratio: %d", ih->fi, ih->di, rc); + usart->US_CR |= AT91C_US_RXDIS | AT91C_US_RSTRX; usart->US_FIDI = rc & 0x3ff; + usart->US_CR |= AT91C_US_RXEN; set_atr_state(ih, ATR_S_WAIT_TS); } else if (new_state == ISO7816_S_WAIT_READER) { /* CLA INS P1 P2 LEN */ @@ -157,11 +162,11 @@ static enum atr_state next_intb_state(struct iso7816_3_handle *ih, u_int8_t ch) DEBUGPCR("found Fi=%u Di=%u", ih->fi, ih->di); } goto from_ta; + default: + DEBUGPCR("something wrong, old_state != TA"); + return ATR_S_WAIT_TCK; } - DEBUGPCR("something wrong, old_state != TA"); - return ATR_S_WAIT_TCK; - from_td: if (ih->atr_last_td & 0x10) return ATR_S_WAIT_TA; @@ -278,7 +283,7 @@ void process_byte(struct iso7816_3_handle *ih, u_int8_t byte) new_state = process_byte_reader(ih, byte); break; case ISO7816_S_WAIT_CARD: - //new_state = process_byte_card(ih, byte); + new_state = process_byte_card(ih, byte); break; } @@ -286,7 +291,7 @@ void process_byte(struct iso7816_3_handle *ih, u_int8_t byte) set_state(ih, new_state); } -static int __ramfunc usart_irq(void) +static __ramfunc void usart_irq(void) { u_int32_t csr = usart->US_CSR; u_int8_t octet; @@ -309,6 +314,18 @@ static int __ramfunc usart_irq(void) } } +/* handler for the RST input pin state change */ +static void reset_pin_irq(u_int32_t pio) +{ + if (!AT91F_PIO_IsInputSet(AT91C_BASE_PIOA, pio)) { + DEBUGPCR("nRST"); + set_state(&isoh, ISO7816_S_RESET); + } else { + DEBUGPCR("RST"); + set_state(&isoh, ISO7816_S_WAIT_ATR); + } +} + void iso_uart_dump(void) { u_int32_t csr = usart->US_CSR; @@ -318,7 +335,7 @@ void iso_uart_dump(void) void iso_uart_rst(unsigned int state) { - DEBUGPCR("USART nRST set state=%u", state); + DEBUGPCR("USART set nRST set state=%u", state); switch (state) { case 0: AT91F_PIO_ClearOutput(AT91C_BASE_PIOA, SIMTRACE_PIO_nRST); @@ -341,10 +358,9 @@ void iso_uart_rx_mode(void) usart->US_IER = AT91C_US_RXRDY | AT91C_US_OVRE | AT91C_US_FRAME | AT91C_US_PARE | AT91C_US_NACK | AT91C_US_ITERATION; - /* Enable the receiver */ - usart->US_CR = AT91C_US_RXEN; - set_state(&isoh, ISO7816_S_WAIT_ATR); + /* call interrupt handler once to set initial state RESET / ATR */ + reset_pin_irq(SIMTRACE_PIO_nRST); } void iso_uart_clk_master(unsigned int master) @@ -367,23 +383,23 @@ void iso_uart_init(void) { DEBUGPCR("USART Initializing"); + /* make sure we get clock from the power management controller */ AT91F_US0_CfgPMC(); /* configure all 3 signals as input */ AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, SIMTRACE_PIO_IO, SIMTRACE_PIO_CLK); - AT91F_PIO_CfgInput(AT91C_BASE_PIOA, SIMTRACE_PIO_nRST); AT91F_AIC_ConfigureIt(AT91C_BASE_AIC, AT91C_ID_US0, OPENPCD_IRQ_PRIO_USART, AT91C_AIC_SRCTYPE_INT_HIGH_LEVEL, &usart_irq); - AT91F_AIC_EnableIt(AT91C_BASE_AIC, AT91C_ID_US0); usart->US_CR = AT91C_US_RXDIS | AT91C_US_TXDIS | (AT91C_US_RSTRX | AT91C_US_RSTTX); /* FIXME: wait for some time */ usart->US_CR = AT91C_US_RXDIS | AT91C_US_TXDIS; + /* ISO7816 T=0 mode with external clock input */ usart->US_MR = AT91C_US_USMODE_ISO7816_0 | AT91C_US_CLKS_EXT | AT91C_US_CHRL_8_BITS | AT91C_US_NBSTOP_1_BIT | AT91C_US_CKLO; @@ -396,4 +412,8 @@ void iso_uart_init(void) usart->US_RTOR = 0; /* Disable Transmitter Timeguard */ usart->US_TTGR = 0; + + pio_irq_register(SIMTRACE_PIO_nRST, &reset_pin_irq); + AT91F_PIO_CfgInputFilter(AT91C_BASE_PIOA, SIMTRACE_PIO_nRST); + pio_irq_enable(SIMTRACE_PIO_nRST); } |