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-rw-r--r--arch/mips/cpu/mips32/asc_serial.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/arch/mips/cpu/mips32/asc_serial.c b/arch/mips/cpu/mips32/asc_serial.c
new file mode 100644
index 0000000..7239804
--- /dev/null
+++ b/arch/mips/cpu/mips32/asc_serial.c
@@ -0,0 +1,285 @@
+/*
+ * (INCA) ASC UART support
+ */
+
+#include <config.h>
+#include <common.h>
+#include <asm/inca-ip.h>
+#include "asc_serial.h"
+
+
+#define SET_BIT(reg, mask) reg |= (mask)
+#define CLEAR_BIT(reg, mask) reg &= (~mask)
+#define CLEAR_BITS(reg, mask) CLEAR_BIT(reg, mask)
+#define SET_BITS(reg, mask) SET_BIT(reg, mask)
+#define SET_BITFIELD(reg, mask, off, val) {reg &= (~mask); reg |= (val << off);}
+
+extern uint incaip_get_fpiclk(void);
+
+static int serial_setopt (void);
+
+/* pointer to ASC register base address */
+static volatile incaAsc_t *pAsc = (incaAsc_t *)INCA_IP_ASC;
+
+/******************************************************************************
+*
+* serial_init - initialize a INCAASC channel
+*
+* This routine initializes the number of data bits, parity
+* and set the selected baud rate. Interrupts are disabled.
+* Set the modem control signals if the option is selected.
+*
+* RETURNS: N/A
+*/
+
+int serial_init (void)
+{
+ /* we have to set PMU.EN13 bit to enable an ASC device*/
+ INCAASC_PMU_ENABLE(13);
+
+ /* and we have to set CLC register*/
+ CLEAR_BIT(pAsc->asc_clc, ASCCLC_DISS);
+ SET_BITFIELD(pAsc->asc_clc, ASCCLC_RMCMASK, ASCCLC_RMCOFFSET, 0x0001);
+
+ /* initialy we are in async mode */
+ pAsc->asc_con = ASCCON_M_8ASYNC;
+
+ /* select input port */
+ pAsc->asc_pisel = (CONSOLE_TTY & 0x1);
+
+ /* TXFIFO's filling level */
+ SET_BITFIELD(pAsc->asc_txfcon, ASCTXFCON_TXFITLMASK,
+ ASCTXFCON_TXFITLOFF, INCAASC_TXFIFO_FL);
+ /* enable TXFIFO */
+ SET_BIT(pAsc->asc_txfcon, ASCTXFCON_TXFEN);
+
+ /* RXFIFO's filling level */
+ SET_BITFIELD(pAsc->asc_txfcon, ASCRXFCON_RXFITLMASK,
+ ASCRXFCON_RXFITLOFF, INCAASC_RXFIFO_FL);
+ /* enable RXFIFO */
+ SET_BIT(pAsc->asc_rxfcon, ASCRXFCON_RXFEN);
+
+ /* enable error signals */
+ SET_BIT(pAsc->asc_con, ASCCON_FEN);
+ SET_BIT(pAsc->asc_con, ASCCON_OEN);
+
+ /* acknowledge ASC interrupts */
+ ASC_INTERRUPTS_CLEAR(INCAASC_IRQ_LINE_ALL);
+
+ /* disable ASC interrupts */
+ ASC_INTERRUPTS_DISABLE(INCAASC_IRQ_LINE_ALL);
+
+ /* set FIFOs into the transparent mode */
+ SET_BIT(pAsc->asc_txfcon, ASCTXFCON_TXTMEN);
+ SET_BIT(pAsc->asc_rxfcon, ASCRXFCON_RXTMEN);
+
+ /* set baud rate */
+ serial_setbrg();
+
+ /* set the options */
+ serial_setopt();
+
+ return 0;
+}
+
+void serial_setbrg (void)
+{
+ ulong uiReloadValue, fdv;
+ ulong f_ASC;
+
+ f_ASC = incaip_get_fpiclk();
+
+#ifndef INCAASC_USE_FDV
+ fdv = 2;
+ uiReloadValue = (f_ASC / (fdv * 16 * CONFIG_BAUDRATE)) - 1;
+#else
+ fdv = INCAASC_FDV_HIGH_BAUDRATE;
+ uiReloadValue = (f_ASC / (8192 * CONFIG_BAUDRATE / fdv)) - 1;
+#endif /* INCAASC_USE_FDV */
+
+ if ( (uiReloadValue < 0) || (uiReloadValue > 8191) )
+ {
+#ifndef INCAASC_USE_FDV
+ fdv = 3;
+ uiReloadValue = (f_ASC / (fdv * 16 * CONFIG_BAUDRATE)) - 1;
+#else
+ fdv = INCAASC_FDV_LOW_BAUDRATE;
+ uiReloadValue = (f_ASC / (8192 * CONFIG_BAUDRATE / fdv)) - 1;
+#endif /* INCAASC_USE_FDV */
+
+ if ( (uiReloadValue < 0) || (uiReloadValue > 8191) )
+ {
+ return; /* can't impossibly generate that baud rate */
+ }
+ }
+
+ /* Disable Baud Rate Generator; BG should only be written when R=0 */
+ CLEAR_BIT(pAsc->asc_con, ASCCON_R);
+
+#ifndef INCAASC_USE_FDV
+ /*
+ * Disable Fractional Divider (FDE)
+ * Divide clock by reload-value + constant (BRS)
+ */
+ /* FDE = 0 */
+ CLEAR_BIT(pAsc->asc_con, ASCCON_FDE);
+
+ if ( fdv == 2 )
+ CLEAR_BIT(pAsc->asc_con, ASCCON_BRS); /* BRS = 0 */
+ else
+ SET_BIT(pAsc->asc_con, ASCCON_BRS); /* BRS = 1 */
+
+#else /* INCAASC_USE_FDV */
+
+ /* Enable Fractional Divider */
+ SET_BIT(pAsc->asc_con, ASCCON_FDE); /* FDE = 1 */
+
+ /* Set fractional divider value */
+ pAsc->asc_fdv = fdv & ASCFDV_VALUE_MASK;
+
+#endif /* INCAASC_USE_FDV */
+
+ /* Set reload value in BG */
+ pAsc->asc_bg = uiReloadValue;
+
+ /* Enable Baud Rate Generator */
+ SET_BIT(pAsc->asc_con, ASCCON_R); /* R = 1 */
+}
+
+/*******************************************************************************
+*
+* serial_setopt - set the serial options
+*
+* Set the channel operating mode to that specified. Following options
+* are supported: CREAD, CSIZE, PARENB, and PARODD.
+*
+* Note, this routine disables the transmitter. The calling routine
+* may have to re-enable it.
+*
+* RETURNS:
+* Returns 0 to indicate success, otherwise -1 is returned
+*/
+
+static int serial_setopt (void)
+{
+ ulong con;
+
+ switch ( ASC_OPTIONS & ASCOPT_CSIZE )
+ {
+ /* 7-bit-data */
+ case ASCOPT_CS7:
+ con = ASCCON_M_7ASYNCPAR; /* 7-bit-data and parity bit */
+ break;
+
+ /* 8-bit-data */
+ case ASCOPT_CS8:
+ if ( ASC_OPTIONS & ASCOPT_PARENB )
+ con = ASCCON_M_8ASYNCPAR; /* 8-bit-data and parity bit */
+ else
+ con = ASCCON_M_8ASYNC; /* 8-bit-data no parity */
+ break;
+
+ /*
+ * only 7 and 8-bit frames are supported
+ * if we don't use IOCTL extensions
+ */
+ default:
+ return -1;
+ }
+
+ if ( ASC_OPTIONS & ASCOPT_STOPB )
+ SET_BIT(con, ASCCON_STP); /* 2 stop bits */
+ else
+ CLEAR_BIT(con, ASCCON_STP); /* 1 stop bit */
+
+ if ( ASC_OPTIONS & ASCOPT_PARENB )
+ SET_BIT(con, ASCCON_PEN); /* enable parity checking */
+ else
+ CLEAR_BIT(con, ASCCON_PEN); /* disable parity checking */
+
+ if ( ASC_OPTIONS & ASCOPT_PARODD )
+ SET_BIT(con, ASCCON_ODD); /* odd parity */
+ else
+ CLEAR_BIT(con, ASCCON_ODD); /* even parity */
+
+ if ( ASC_OPTIONS & ASCOPT_CREAD )
+ SET_BIT(pAsc->asc_whbcon, ASCWHBCON_SETREN); /* Receiver enable */
+
+ pAsc->asc_con |= con;
+
+ return 0;
+}
+
+void serial_putc (const char c)
+{
+ uint txFl = 0;
+
+ if (c == '\n') serial_putc ('\r');
+
+ /* check do we have a free space in the TX FIFO */
+ /* get current filling level */
+ do
+ {
+ txFl = ( pAsc->asc_fstat & ASCFSTAT_TXFFLMASK ) >> ASCFSTAT_TXFFLOFF;
+ }
+ while ( txFl == INCAASC_TXFIFO_FULL );
+
+ pAsc->asc_tbuf = c; /* write char to Transmit Buffer Register */
+
+ /* check for errors */
+ if ( pAsc->asc_con & ASCCON_OE )
+ {
+ SET_BIT(pAsc->asc_whbcon, ASCWHBCON_CLROE);
+ return;
+ }
+}
+
+void serial_puts (const char *s)
+{
+ while (*s)
+ {
+ serial_putc (*s++);
+ }
+}
+
+int serial_getc (void)
+{
+ ulong symbol_mask;
+ char c;
+
+ while (!serial_tstc());
+
+ symbol_mask =
+ ((ASC_OPTIONS & ASCOPT_CSIZE) == ASCOPT_CS7) ? (0x7f) : (0xff);
+
+ c = (char)(pAsc->asc_rbuf & symbol_mask);
+
+ return c;
+}
+
+int serial_tstc (void)
+{
+ int res = 1;
+
+ if ( (pAsc->asc_fstat & ASCFSTAT_RXFFLMASK) == 0 )
+ {
+ res = 0;
+ }
+ else if ( pAsc->asc_con & ASCCON_FE )
+ {
+ SET_BIT(pAsc->asc_whbcon, ASCWHBCON_CLRFE);
+ res = 0;
+ }
+ else if ( pAsc->asc_con & ASCCON_PE )
+ {
+ SET_BIT(pAsc->asc_whbcon, ASCWHBCON_CLRPE);
+ res = 0;
+ }
+ else if ( pAsc->asc_con & ASCCON_OE )
+ {
+ SET_BIT(pAsc->asc_whbcon, ASCWHBCON_CLROE);
+ res = 0;
+ }
+
+ return res;
+}
generated by cgit v1.1 at 2024-12-12 01:02:27 +0000