X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=cpu%2Farm%2Fdrv%2Fser_at91.c;h=902ccc2f6ff692546cc09d41ea89a3e72937c48c;hb=HEAD;hp=30bd049ce48e2188f72d128a09172925081ef42e;hpb=753d17c6975a0edd44fd771f1af01d95a61d292a;p=bertos.git diff --git a/cpu/arm/drv/ser_at91.c b/cpu/arm/drv/ser_at91.c deleted file mode 100644 index 30bd049c..00000000 --- a/cpu/arm/drv/ser_at91.c +++ /dev/null @@ -1,397 +0,0 @@ -/** - * \file - * - * - * \brief ARM UART and SPI I/O driver - * - * - * \version $Id: ser_amr.c 18280 2007-10-11 15:14:20Z asterix $ - * \author Daniele Basile - */ - -#include - -//#include "ser_at91.h" -#include -#include - -#include /* Required for bus macros overrides */ -#include /* CLOCK_FREQ */ - -#include -#include - -#include - - -/** - * \name Overridable serial bus hooks - * - * These can be redefined in hw.h to implement - * special bus policies such as half-duplex, 485, etc. - * - * - * \code - * TXBEGIN TXCHAR TXEND TXOFF - * | __________|__________ | | - * | | | | | | | | | - * v v v v v v v v v - * ______ __ __ __ __ __ __ ________________ - * \/ \/ \/ \/ \/ \/ \/ - * ______/\__/\__/\__/\__/\__/\__/ - * - * \endcode - * - * \{ - */ - -#ifndef SER_UART0_IRQ_INIT - /** - * Default IRQ INIT macro - invoked in uart0_init() - * - * - Disable all interrupt - * - Register USART0 interrupt - * - Enable USART0 clock. - */ - #define SER_UART0_IRQ_INIT do { \ - US0_IDR = 0xFFFFFFFF; \ - /* Set the vector. */ \ - AIC_SVR(US0_ID) = uart0_irq_dispatcher; \ - /* Initialize to edge triggered with defined priority. */ \ - AIC_SMR(US0_ID) = AIC_SRCTYPE_INT_EDGE_TRIGGERED; \ - /* Enable the USART IRQ */ \ - AIC_IECR = BV(US0_ID); \ - PMC_PCER = BV(US0_ID); \ - } while (0) -#endif - -#ifndef SER_UART0_BUS_TXINIT - /** - * Default TXINIT macro - invoked in uart0_init() - * - * - Disable GPIO on USART0 tx/rx pins - * - Reset USART0 - * - Set serial param: mode Normal, 8bit data, 1bit stop - * - Enable both the receiver and the transmitter - * - Enable only the RX complete interrupt - */ - #if CPU_ARM_AT91 - #define SER_UART0_BUS_TXINIT do { \ - PIOA_PDR = BV(5) | BV(6);\ - US0_CR = BV(US_RSTRX) | BV(US_RSTTX); \ - US0_MR = US_CHMODE_NORMAL | US_CHRL_8 | US_NBSTOP_1; \ - US0_CR = BV(US_RXEN) | BV(US_TXEN); \ - US0_IER = BV(US_RXRDY); \ - } while (0) - /*#elif Add other ARM families here */ - #else - #error Unknown CPU - #endif - -#endif - -#ifndef SER_UART0_BUS_TXBEGIN - /** - * Invoked before starting a transmission - * - * - Enable both the receiver and the transmitter - * - Enable both the RX complete and TX empty interrupts - */ - #define SER_UART0_BUS_TXBEGIN do { \ - US0_CR = BV(US_RXEN) | BV(US_TXEN); \ - US0_IER = BV(US_TXRDY) | BV(US_RXRDY); \ - } while (0) -#endif - -#ifndef SER_UART0_BUS_TXCHAR - /** - * Invoked to send one character. - */ - #define SER_UART0_BUS_TXCHAR(c) do { \ - US0_THR = c; \ - } while (0) -#endif - -#ifndef SER_UART0_BUS_TXEND - /** - * Invoked as soon as the txfifo becomes empty - * - * - Keep both the receiver and the transmitter enabled - * - Keep the RX complete interrupt enabled - * - Disable the TX empty interrupts - */ - #define SER_UART0_BUS_TXEND do { \ - US0_CR = BV(US_RXEN) | BV(US_TXEN); \ - US0_IER = BV(US_RXRDY); \ - US0_IDR = BV(US_TXRDY); \ - } while (0) -#endif - -/** - * \def CONFIG_SER_STROBE - * - * This is a debug facility that can be used to - * monitor SER interrupt activity on an external pin. - * - * To use strobes, redefine the macros SER_STROBE_ON, - * SER_STROBE_OFF and SER_STROBE_INIT and set - * CONFIG_SER_STROBE to 1. - */ -#if !defined(CONFIG_SER_STROBE) || !CONFIG_SER_STROBE - #define SER_STROBE_ON do {/*nop*/} while(0) - #define SER_STROBE_OFF do {/*nop*/} while(0) - #define SER_STROBE_INIT do {/*nop*/} while(0) -#endif - - -/* From the high-level serial driver */ -extern struct Serial ser_handles[SER_CNT]; - -/* TX and RX buffers */ -static unsigned char uart0_txbuffer[CONFIG_UART0_TXBUFSIZE]; -static unsigned char uart0_rxbuffer[CONFIG_UART0_RXBUFSIZE]; - -/** - * Internal hardware state structure - * - * The \a sending variable is true while the transmission - * interrupt is retriggering itself. - * - * For the USARTs the \a sending flag is useful for taking specific - * actions before sending a burst of data, at the start of a trasmission - * but not before every char sent. - * - * For the SPI, this flag is necessary because the SPI sends and receives - * bytes at the same time and the SPI IRQ is unique for send/receive. - * The only way to start transmission is to write data in SPDR (this - * is done by spi_starttx()). We do this *only* if a transfer is - * not already started. - */ -struct ArmSerial -{ - struct SerialHardware hw; - volatile bool sending; -}; - - -/* - * These are to trick GCC into *not* using absolute addressing mode - * when accessing ser_handles, which is very expensive. - * - * Accessing through these pointers generates much shorter - * (and hopefully faster) code. - */ -struct Serial *ser_uart0 = &ser_handles[SER_UART0]; - -/** - * Serial 0 TX interrupt handler - */ -static void serirq_tx(void) -{ - SER_STROBE_ON; - - struct FIFOBuffer * const txfifo = &ser_uart0->txfifo; - - if (fifo_isempty(txfifo)) - { - SER_UART0_BUS_TXEND; - } - else - { - char c = fifo_pop(txfifo); -// kprintf("Tx char: %c\n", c); - SER_UART0_BUS_TXCHAR(c); - } - - SER_STROBE_OFF; -} - -/** - * Serial 0 RX complete interrupt handler. - */ -static void serirq_rx(void) -{ - SER_STROBE_ON; - - /* Should be read before US_CRS */ - ser_uart0->status |= US0_CSR & (SERRF_RXSROVERRUN | SERRF_FRAMEERROR); - - char c = US0_RHR; - struct FIFOBuffer * const rxfifo = &ser_uart0->rxfifo; - - if (fifo_isfull(rxfifo)) - ser_uart0->status |= SERRF_RXFIFOOVERRUN; - else - { -// kprintf("Recv char: %c\n", c); - fifo_push(rxfifo, c); - } - - SER_STROBE_OFF; -} - -/** - * Serial IRQ dispatcher. - */ -static void uart0_irq_dispatcher(void) __attribute__ ((naked)); -static void uart0_irq_dispatcher(void) -{ - IRQ_ENTRY(); - - if (US0_IMR & BV(US_RXRDY)) - { -// kprintf("IRQ RX\n"); - serirq_rx(); - } - if (US0_IMR & BV(US_TXRDY)) - { -// kprintf("IRQ TX\n"); - serirq_tx(); - } - IRQ_EXIT(); -} - -/* - * Callbacks - */ -static void uart0_init( - UNUSED_ARG(struct SerialHardware *, _hw), - UNUSED_ARG(struct Serial *, ser)) -{ - SER_UART0_IRQ_INIT; - SER_UART0_BUS_TXINIT; - SER_STROBE_INIT; -} - -static void uart0_cleanup(UNUSED_ARG(struct SerialHardware *, _hw)) -{ - US0_CR = BV(US_RSTRX) | BV(US_RSTTX) | BV(US_RXDIS) | BV(US_TXDIS) | BV(US_RSTSTA); -} - -static void uart0_enabletxirq(struct SerialHardware *_hw) -{ - struct ArmSerial *hw = (struct ArmSerial *)_hw; - - /* - * WARNING: racy code here! The tx interrupt sets hw->sending to false - * when it runs with an empty fifo. The order of statements in the - * if-block matters. - */ - if (!hw->sending) - { - hw->sending = true; - SER_UART0_BUS_TXBEGIN; - } -} - -static void uart0_setbaudrate(UNUSED_ARG(struct SerialHardware *, _hw), unsigned long rate) -{ - /* Compute baud-rate period */ - US0_BRGR = CLOCK_FREQ / (16 * rate); - //DB(kprintf("uart0_setbaudrate(rate=%lu): period=%d\n", rate, period);) -} - -static void uart0_setparity(UNUSED_ARG(struct SerialHardware *, _hw), int parity) -{ - /* Set UART parity */ - switch(parity) - { - case SER_PARITY_NONE: - { - /* Parity mode. */ - US0_MR |= US_PAR_MASK; - break; - } - case SER_PARITY_EVEN: - { - /* Even parity.*/ - US0_MR |= US_PAR_EVEN; - break; - } - case SER_PARITY_ODD: - { - /* Odd parity.*/ - US0_MR |= US_PAR_ODD; - break; - } - } - -} - -static bool tx_sending(struct SerialHardware* _hw) -{ - struct ArmSerial *hw = (struct ArmSerial *)_hw; - return hw->sending; -} - -// FIXME: move into compiler.h? Ditch? -#if COMPILER_C99 - #define C99INIT(name,val) .name = val -#elif defined(__GNUC__) - #define C99INIT(name,val) name: val -#else - #warning No designated initializers, double check your code - #define C99INIT(name,val) (val) -#endif - -/* - * High-level interface data structures - */ -static const struct SerialHardwareVT UART0_VT = -{ - C99INIT(init, uart0_init), - C99INIT(cleanup, uart0_cleanup), - C99INIT(setBaudrate, uart0_setbaudrate), - C99INIT(setParity, uart0_setparity), - C99INIT(txStart, uart0_enabletxirq), - C99INIT(txSending, tx_sending), -}; - -static struct ArmSerial UARTDescs[SER_CNT] = -{ - { - C99INIT(hw, /**/) { - C99INIT(table, &UART0_VT), - C99INIT(txbuffer, uart0_txbuffer), - C99INIT(rxbuffer, uart0_rxbuffer), - C99INIT(txbuffer_size, sizeof(uart0_txbuffer)), - C99INIT(rxbuffer_size, sizeof(uart0_rxbuffer)), - }, - C99INIT(sending, false), - } -}; - -struct SerialHardware *ser_hw_getdesc(int unit) -{ - ASSERT(unit < SER_CNT); - return &UARTDescs[unit].hw; -}