patch-2.1.97 linux/arch/ppc/boot/mbxtty.c

• Lines: 119
• Date: Tue Apr 14 17:33:47 1998
• Orig file: v2.1.96/linux/arch/ppc/boot/mbxtty.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.96/linux/arch/ppc/boot/mbxtty.c linux/arch/ppc/boot/mbxtty.c
@@ -0,0 +1,118 @@
+
+
+/* Minimal serial functions needed to send messages out the serial
+ * port on the MBX console.
+ *
+ * The MBX uxes SMC1 for the serial port.  We reset the port and use
+ * only the first BD that EPPC-Bug set up as a character FIFO.
+ *
+ * It's a big hack, but I don't have time right now....I want a kernel
+ * that boots.
+ */
+#include <linux/types.h>
+#include <asm/mbx.h>
+#include "../8xx_io/commproc.h"
+
+#define CPM_CPCR	((volatile ushort *)0xfa2009c0)
+#define SMC1_MODE	((volatile ushort *)0xfa200a82)
+#define SMC1_TBDF	((volatile bd_t *)0xfa202c90)
+#define SMC1_RBDF	((volatile bd_t *)0xfa202c10)
+
+static cpm8xx_t	*cpmp = (cpm8xx_t *)&(((immap_t *)MBX_IMAP_ADDR)->im_cpm);
+
+void
+serial_init(void)
+{
+	volatile smc_t		*sp;
+	volatile smc_uart_t	*up;
+	volatile cbd_t	*tbdf, *rbdf;
+	volatile cpm8xx_t	*cp;
+
+	cp = cpmp;
+	sp = (smc_t*)&(cp->cp_smc[0]);
+	up = (smc_uart_t *)&cp->cp_dparam[PROFF_SMC1];
+
+	/* Disable transmitter/receiver.
+	*/
+	sp->smc_smcm &= ~(SMCMR_REN | SMCMR_TEN);
+
+	tbdf = (cbd_t *)&cp->cp_dpmem[up->smc_tbase];
+	rbdf = (cbd_t *)&cp->cp_dpmem[up->smc_rbase];
+
+	/* Issue a stop transmit, and wait for it.
+	*/
+	cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_SMC1, CPM_CR_STOP_TX) | CPM_CR_FLG;
+	while (cp->cp_cpcr & CPM_CR_FLG);
+
+	/* Make the first buffer the only buffer.
+	*/
+	tbdf->cbd_sc |= BD_SC_WRAP;
+	rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
+
+	/* Single character receive.
+	*/
+	up->smc_mrblr = 1;
+	up->smc_maxidl = 0;
+
+	/* Initialize Tx/Rx parameters.
+	*/
+	cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_SMC1, CPM_CR_INIT_TRX) | CPM_CR_FLG;
+	while (cp->cp_cpcr & CPM_CR_FLG);
+
+	/* Enable transmitter/receiver.
+	*/
+	sp->smc_smcm |= SMCMR_REN | SMCMR_TEN;
+}
+
+void
+serial_putchar(const char c)
+{
+	volatile cbd_t		*tbdf;
+	volatile char		*buf;
+	volatile smc_uart_t	*up;
+
+	up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC1];
+	tbdf = (cbd_t *)&cpmp->cp_dpmem[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()
+{
+	volatile cbd_t		*rbdf;
+	volatile char		*buf;
+	volatile smc_uart_t	*up;
+	char			c;
+
+	up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC1];
+	rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
+
+	/* Wait for character to show up.
+	*/
+	buf = (char *)rbdf->cbd_bufaddr;
+	while (rbdf->cbd_sc & BD_SC_EMPTY);
+	c = *buf;
+	rbdf->cbd_sc |= BD_SC_EMPTY;
+
+	return(c);
+}
+
+int
+serial_tstc()
+{
+	volatile cbd_t		*rbdf;
+	volatile smc_uart_t	*up;
+
+	up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC1];
+	rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
+
+	return(!(rbdf->cbd_sc & BD_SC_EMPTY));
+}