u8 bfspi_read_8_bits(u16 chip_select)
{
u16 flag_enable, flag;
u8 ret;
if (chip_select < 8) {
flag = bfin_read_SPI_FLG();
flag_enable = flag & ~(1 << (chip_select + 8));
//PRINTK("read: flag: 0x%04x flag_enable: 0x%04x \n", flag, flag_enable);
}
else {
#if (defined(CONFIG_BF533) || defined(CONFIG_BF532))
bfin_write_FIO_FLAG_C((1<<chip_select));
#endif
#if (defined(CONFIG_BF536) || defined(CONFIG_BF537))
bfin_write_PORTFIO_CLEAR((1<<chip_select));
#endif
__builtin_bfin_ssync();
}
/* drop SPISEL */
bfin_write_SPI_FLG(flag_enable);
/* read kicks off transfer, detect end by polling RXS, we
read the shadow register to prevent another transfer
being started
While reading we write a dummy tx value, 0xff. For
the MMC card, a 0 bit indicates the start of a command
sequence therefore an all 1's sequence keeps the MMC
card in the current state.
*/
bfin_write_SPI_TDBR(0xff);
bfin_read_SPI_RDBR(); __builtin_bfin_ssync();
do { } while (!(bfin_read_SPI_STAT() & RXS)); //hardcode RXS mask
ret = bfin_read_SPI_SHADOW(); __builtin_bfin_ssync();
//ret = read_RDBR(); __builtin_bfin_ssync();
PRINTK("\nkern>> read: 0x%04X\n", ret);
/* raise SPISEL */
if (chip_select < 8) {
bfin_write_SPI_FLG(flag);
}
else {
#if (defined(CONFIG_BF533) || defined(CONFIG_BF532))
bfin_write_FIO_FLAG_S((1<<chip_select));
#endif
#if (defined(CONFIG_BF536) || defined(CONFIG_BF537))
bfin_write_PORTFIO_SET((1<<chip_select));
#endif
__builtin_bfin_ssync();
}
return ret;
}
void bfspi_write_8_bits(u16 chip_select, u8 bits)
{
u16 flag_enable, flag;
if (chip_select < 8) {
flag = bfin_read_SPI_FLG();
flag_enable = flag & ~(1 << (chip_select + 8));
//PRINTK("kern>> chip_select: %d write: flag: 0x%04x flag_enable: 0x%04x \n", chip_select, flag, flag_enable);
/* drop SPISEL */
bfin_write_SPI_FLG(flag_enable);
}
else {
#if (defined(CONFIG_BF533) || defined(CONFIG_BF532))
bfin_write_FIO_FLAG_C((1<<chip_select));
#endif
#if (defined(CONFIG_BF536) || defined(CONFIG_BF537))
bfin_write_PORTFIO_CLEAR((1<<chip_select));
#endif
__builtin_bfin_ssync();
}
/* read kicks off transfer, detect end by polling RXS */
bfin_write_SPI_TDBR(bits);
bfin_read_SPI_RDBR(); __builtin_bfin_ssync();
do {} while (!(bfin_read_SPI_STAT() & RXS)); //hardcode RXS mask
//(void) bfin_read_SPI_SHADOW(); //discard data && clear rxs
//__builtin_bfin_ssync();
/* raise SPISEL */
if (chip_select < 8) {
bfin_write_SPI_FLG(flag);
}
else {
#if (defined(CONFIG_BF533) || defined(CONFIG_BF532))
bfin_write_FIO_FLAG_S((1<<chip_select));
#endif
#if (defined(CONFIG_BF536) || defined(CONFIG_BF537))
bfin_write_PORTFIO_SET((1<<chip_select));
#endif
__builtin_bfin_ssync();
}
}
static void bf537_demux_error_irq(unsigned int int_err_irq,
struct irq_desc *inta_desc)
{
int irq = 0;
#if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
if (bfin_read_EMAC_SYSTAT() & EMAC_ERR_MASK)
irq = IRQ_MAC_ERROR;
else
#endif
if (bfin_read_SPORT0_STAT() & SPORT_ERR_MASK)
irq = IRQ_SPORT0_ERROR;
else if (bfin_read_SPORT1_STAT() & SPORT_ERR_MASK)
irq = IRQ_SPORT1_ERROR;
else if (bfin_read_PPI_STATUS() & PPI_ERR_MASK)
irq = IRQ_PPI_ERROR;
else if (bfin_read_CAN_GIF() & CAN_ERR_MASK)
irq = IRQ_CAN_ERROR;
else if (bfin_read_SPI_STAT() & SPI_ERR_MASK)
irq = IRQ_SPI_ERROR;
else if ((bfin_read_UART0_IIR() & UART_ERR_MASK) == UART_ERR_MASK)
irq = IRQ_UART0_ERROR;
else if ((bfin_read_UART1_IIR() & UART_ERR_MASK) == UART_ERR_MASK)
irq = IRQ_UART1_ERROR;
if (irq) {
if (error_int_mask & (1L << (irq - IRQ_PPI_ERROR)))
bfin_handle_irq(irq);
else {
switch (irq) {
case IRQ_PPI_ERROR:
bfin_write_PPI_STATUS(PPI_ERR_MASK);
break;
#if (defined(CONFIG_BF537) || defined(CONFIG_BF536))
case IRQ_MAC_ERROR:
bfin_write_EMAC_SYSTAT(EMAC_ERR_MASK);
break;
#endif
case IRQ_SPORT0_ERROR:
bfin_write_SPORT0_STAT(SPORT_ERR_MASK);
break;
case IRQ_SPORT1_ERROR:
bfin_write_SPORT1_STAT(SPORT_ERR_MASK);
break;
case IRQ_CAN_ERROR:
bfin_write_CAN_GIS(CAN_ERR_MASK);
break;
case IRQ_SPI_ERROR:
bfin_write_SPI_STAT(SPI_ERR_MASK);
break;
default:
break;
}
pr_debug("IRQ %d:"
" MASKED PERIPHERAL ERROR INTERRUPT ASSERTED\n",
irq);
}
} else
pr_err("%s: IRQ ?: PERIPHERAL ERROR INTERRUPT ASSERTED BUT NO SOURCE FOUND\n",
__func__);
}
