patch-2.3.99-pre7 linux/arch/ppc/mbxboot/m8260_tty.c

• Lines: 202
• Date: Wed May 3 01:47:57 2000
• Orig file: v2.3.99-pre6/linux/arch/ppc/mbxboot/m8260_tty.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre6/linux/arch/ppc/mbxboot/m8260_tty.c linux/arch/ppc/mbxboot/m8260_tty.c
@@ -0,0 +1,201 @@
+
+
+/* Minimal serial functions needed to send messages out the serial
+ * port on SMC1.
+ */
+#include <linux/types.h>
+#include "asm/mpc8260.h"
+#include "asm/cpm_8260.h"
+
+uint	no_print;
+extern char	*params[];
+extern int	nparams;
+static		u_char	cons_hold[128], *sgptr;
+static		int	cons_hold_cnt;
+
+void
+serial_init(bd_t *bd)
+{
+	volatile smc_t		*sp;
+	volatile smc_uart_t	*up;
+	volatile cbd_t	*tbdf, *rbdf;
+	volatile immap_t	*ip;
+	volatile iop8260_t	*io;
+	volatile cpm8260_t	*cp;
+	uint	dpaddr, memaddr;
+
+	ip = (immap_t *)IMAP_ADDR;
+
+	sp = (smc_t*)&(ip->im_smc[0]);
+	*(ushort *)(&ip->im_dprambase[PROFF_SMC1_BASE]) = PROFF_SMC1;
+	up = (smc_uart_t *)&ip->im_dprambase[PROFF_SMC1];
+
+	cp = &ip->im_cpm;
+	io = &ip->im_ioport;
+
+	/* Disable transmitter/receiver.
+	*/
+	sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
+
+	/* Use Port D for SMC1 instead of other functions.
+	*/
+	io->iop_ppard |= 0x00c00000;
+	io->iop_pdird |= 0x00400000;
+	io->iop_pdird &= ~0x00800000;
+	io->iop_psord &= ~0x00c00000;
+
+	/* Allocate space for two buffer descriptors in the DP ram.
+	 * For now, this address seems OK, but it may have to
+	 * change with newer versions of the firmware.
+	 */
+	dpaddr = 0x0800;
+
+	/* Grab a few bytes from the top of memory.
+	 */
+#if 1
+	memaddr = (bd->bi_memsize - 256) & ~15;
+#else
+	memaddr = 0x0f002c00;
+#endif
+
+	/* Set the physical address of the host memory buffers in
+	 * the buffer descriptors.
+	 */
+	rbdf = (cbd_t *)&ip->im_dprambase[dpaddr];
+	rbdf->cbd_bufaddr = memaddr;
+	rbdf->cbd_sc = 0;
+	tbdf = rbdf + 1;
+	tbdf->cbd_bufaddr = memaddr+128;
+	tbdf->cbd_sc = 0;
+
+	/* Set up the uart parameters in the parameter ram.
+	*/
+	up->smc_rbase = dpaddr;
+	up->smc_tbase = dpaddr+sizeof(cbd_t);
+	up->smc_rfcr = SMC_EB;
+	up->smc_tfcr = SMC_EB;
+	up->smc_brklen = 0;
+	up->smc_brkec = 0;
+	up->smc_brkcr = 0;
+
+	/* Set UART mode, 8 bit, no parity, one stop.
+	 * Enable receive and transmit.
+	 */
+	sp->smc_smcmr = smcr_mk_clen(9) |  SMCMR_SM_UART;
+
+	/* Mask all interrupts and remove anything pending.
+	*/
+	sp->smc_smcm = 0;
+	sp->smc_smce = 0xff;
+
+	/* Set up the baud rate generator.
+	 */
+	ip->im_clkrst.car_sccr = 0;	/* DIV 4 BRG */
+	ip->im_cpmux.cmx_smr = 0;
+	ip->im_brgc1 =
+		((((bd->bi_brgfreq * 1000000)/16) / bd->bi_baudrate) << 1) |
+								CPM_BRG_EN;
+
+	/* Make the first buffer the only buffer.
+	*/
+	tbdf->cbd_sc |= BD_SC_WRAP;
+	rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
+
+#if 0
+	/* Single character receive.
+	*/
+	up->smc_mrblr = 1;
+	up->smc_maxidl = 0;
+#else
+	up->smc_mrblr = 128;
+	up->smc_maxidl = 8;
+#endif
+
+	/* Initialize Tx/Rx parameters.
+	*/
+	cp->cp_cpcr = mk_cr_cmd(CPM_CR_SMC1_PAGE, CPM_CR_SMC1_SBLOCK, 0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+	while (cp->cp_cpcr & CPM_CR_FLG);
+
+	/* Enable transmitter/receiver.
+	*/
+	sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
+}
+
+void
+serial_putchar(const char c)
+{
+	volatile cbd_t		*tbdf;
+	volatile char		*buf;
+	volatile smc_uart_t	*up;
+	volatile immap_t	*ip;
+	extern bd_t		*board_info;
+
+	ip = (immap_t *)IMAP_ADDR;
+	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
+	tbdf = (cbd_t *)&ip->im_dprambase[up->smc_tbase];
+
+	/* Wait for last character to go.
+	*/
+	buf = (char *)tbdf->cbd_bufaddr;
+	while (tbdf->cbd_sc & BD_SC_READY);
+
+	*buf = c;
+	tbdf->cbd_datlen = 1;
+	tbdf->cbd_sc |= BD_SC_READY;
+}
+
+char
+serial_getc()
+{
+	char	c;
+
+	if (cons_hold_cnt <= 0) {
+		cons_hold_cnt = serial_readbuf(cons_hold);
+		sgptr = cons_hold;
+	}
+	c = *sgptr++;
+	cons_hold_cnt--;
+
+	return(c);
+}
+
+int
+serial_readbuf(u_char *cbuf)
+{
+	volatile cbd_t		*rbdf;
+	volatile char		*buf;
+	volatile smc_uart_t	*up;
+	volatile immap_t	*ip;
+	int	i, nc;
+
+	ip = (immap_t *)IMAP_ADDR;
+
+	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
+	rbdf = (cbd_t *)&ip->im_dprambase[up->smc_rbase];
+
+	/* Wait for character to show up.
+	*/
+	buf = (char *)rbdf->cbd_bufaddr;
+	while (rbdf->cbd_sc & BD_SC_EMPTY);
+	nc = rbdf->cbd_datlen;
+	for (i=0; i<nc; i++)
+		*cbuf++ = *buf++;
+	rbdf->cbd_sc |= BD_SC_EMPTY;
+
+	return(nc);
+}
+
+int
+serial_tstc()
+{
+	volatile cbd_t		*rbdf;
+	volatile smc_uart_t	*up;
+	volatile immap_t	*ip;
+
+	ip = (immap_t *)IMAP_ADDR;
+	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
+	rbdf = (cbd_t *)&ip->im_dprambase[up->smc_rbase];
+
+	return(!(rbdf->cbd_sc & BD_SC_EMPTY));
+}
+