1 files changed, 325 insertions, 0 deletions

diff --git a/arch/ppc/boot/simple/m8260_tty.c b/arch/ppc/boot/simple/m8260_tty.c
new file mode 100644
index 0000000..d770947
--- /dev/null
+++ b/arch/ppc/boot/simple/m8260_tty.c
@@ -0,0 +1,325 @@
+/* Minimal serial functions needed to send messages out the serial
+ * port on SMC1.
+ */
+#include <linux/types.h>
+#include <asm/mpc8260.h>
+#include <asm/cpm2.h>
+#include <asm/immap_cpm2.h>
+
+uint	no_print;
+extern char	*params[];
+extern int	nparams;
+static		u_char	cons_hold[128], *sgptr;
+static		int	cons_hold_cnt;
+
+/* If defined, enables serial console.  The value (1 through 4)
+ * should designate which SCC is used, but this isn't complete.  Only
+ * SCC1 is known to work at this time.
+ * We're only linked if SERIAL_CPM_CONSOLE=y, so we only need to test
+ * SERIAL_CPM_SCC1.
+ */
+#ifdef CONFIG_SERIAL_CPM_SCC1
+#define SCC_CONSOLE 1
+#endif
+
+unsigned long
+serial_init(int ignored, bd_t *bd)
+{
+#ifdef SCC_CONSOLE
+	volatile scc_t		*sccp;
+	volatile scc_uart_t	*sup;
+#else
+	volatile smc_t		*sp;
+	volatile smc_uart_t	*up;
+#endif
+	volatile cbd_t	*tbdf, *rbdf;
+	volatile cpm2_map_t	*ip;
+	volatile iop_cpm2_t	*io;
+	volatile cpm_cpm2_t	*cp;
+	uint	dpaddr, memaddr;
+
+	ip = (cpm2_map_t *)CPM_MAP_ADDR;
+	cp = &ip->im_cpm;
+	io = &ip->im_ioport;
+
+	/* Perform a reset.
+	*/
+	cp->cp_cpcr = (CPM_CR_RST | CPM_CR_FLG);
+
+	/* Wait for it.
+	*/
+	while (cp->cp_cpcr & CPM_CR_FLG);
+
+#ifdef CONFIG_ADS8260
+	/* Enable the RS-232 transceivers.
+	*/
+	*(volatile uint *)(BCSR_ADDR + 4) &=
+					~(BCSR1_RS232_EN1 | BCSR1_RS232_EN2);
+#endif
+
+#ifdef SCC_CONSOLE
+	sccp = (scc_t *)&(ip->im_scc[SCC_CONSOLE-1]);
+	sup = (scc_uart_t *)&ip->im_dprambase[PROFF_SCC1 + ((SCC_CONSOLE-1) << 8)];
+	sccp->scc_sccm &= ~(UART_SCCM_TX | UART_SCCM_RX);
+	sccp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+
+	/* Use Port D for SCC1 instead of other functions.
+	*/
+	io->iop_ppard |= 0x00000003;
+	io->iop_psord &= ~0x00000001;	/* Rx */
+	io->iop_psord |= 0x00000002;	/* Tx */
+	io->iop_pdird &= ~0x00000001;	/* Rx */
+	io->iop_pdird |= 0x00000002;	/* Tx */
+
+#else
+	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];
+
+	/* 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;
+#endif
+
+	/* 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.
+	 */
+	memaddr = (bd->bi_memsize - 256) & ~15;
+
+	/* 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.
+	*/
+#ifdef SCC_CONSOLE
+	sup->scc_genscc.scc_rbase = dpaddr;
+	sup->scc_genscc.scc_tbase = dpaddr + sizeof(cbd_t);
+
+	/* Set up the uart parameters in the
+	 * parameter ram.
+	 */
+	sup->scc_genscc.scc_rfcr = CPMFCR_GBL | CPMFCR_EB;
+	sup->scc_genscc.scc_tfcr = CPMFCR_GBL | CPMFCR_EB;
+
+	sup->scc_genscc.scc_mrblr = 128;
+	sup->scc_maxidl = 8;
+	sup->scc_brkcr = 1;
+	sup->scc_parec = 0;
+	sup->scc_frmec = 0;
+	sup->scc_nosec = 0;
+	sup->scc_brkec = 0;
+	sup->scc_uaddr1 = 0;
+	sup->scc_uaddr2 = 0;
+	sup->scc_toseq = 0;
+	sup->scc_char1 = 0x8000;
+	sup->scc_char2 = 0x8000;
+	sup->scc_char3 = 0x8000;
+	sup->scc_char4 = 0x8000;
+	sup->scc_char5 = 0x8000;
+	sup->scc_char6 = 0x8000;
+	sup->scc_char7 = 0x8000;
+	sup->scc_char8 = 0x8000;
+	sup->scc_rccm = 0xc0ff;
+
+	/* Send the CPM an initialize command.
+	*/
+	cp->cp_cpcr = mk_cr_cmd(CPM_CR_SCC1_PAGE, CPM_CR_SCC1_SBLOCK, 0,
+			CPM_CR_INIT_TRX) | CPM_CR_FLG;
+	while (cp->cp_cpcr & CPM_CR_FLG);
+
+	/* Set UART mode, 8 bit, no parity, one stop.
+	 * Enable receive and transmit.
+	 */
+	sccp->scc_gsmrh = 0;
+	sccp->scc_gsmrl =
+		(SCC_GSMRL_MODE_UART | SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16);
+
+	/* Disable all interrupts and clear all pending
+	 * events.
+	 */
+	sccp->scc_sccm = 0;
+	sccp->scc_scce = 0xffff;
+	sccp->scc_dsr = 0x7e7e;
+	sccp->scc_psmr = 0x3000;
+
+	/* Wire BRG1 to SCC1.  The console driver will take care of
+	 * others.
+	 */
+	ip->im_cpmux.cmx_scr = 0;
+#else
+	up->smc_rbase = dpaddr;
+	up->smc_tbase = dpaddr+sizeof(cbd_t);
+	up->smc_rfcr = CPMFCR_EB;
+	up->smc_tfcr = CPMFCR_EB;
+	up->smc_brklen = 0;
+	up->smc_brkec = 0;
+	up->smc_brkcr = 0;
+	up->smc_mrblr = 128;
+	up->smc_maxidl = 8;
+
+	/* 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_cpmux.cmx_smr = 0;
+#endif
+
+	/* The baud rate divisor needs to be coordinated with clk_8260().
+	*/
+	ip->im_brgc1 =
+		(((bd->bi_brgfreq/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;
+
+	/* Initialize Tx/Rx parameters.
+	*/
+#ifdef SCC_CONSOLE
+	sccp->scc_gsmrl |= (SCC_GSMRL_ENR | SCC_GSMRL_ENT);
+#else
+	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;
+#endif
+
+	/* This is ignored.
+	*/
+	return 0;
+}
+
+int
+serial_readbuf(u_char *cbuf)
+{
+	volatile cbd_t		*rbdf;
+	volatile char		*buf;
+#ifdef SCC_CONSOLE
+	volatile scc_uart_t	*sup;
+#else
+	volatile smc_uart_t	*up;
+#endif
+	volatile cpm2_map_t	*ip;
+	int	i, nc;
+
+	ip = (cpm2_map_t *)CPM_MAP_ADDR;
+
+#ifdef SCC_CONSOLE
+	sup = (scc_uart_t *)&ip->im_dprambase[PROFF_SCC1 + ((SCC_CONSOLE-1) << 8)];
+	rbdf = (cbd_t *)&ip->im_dprambase[sup->scc_genscc.scc_rbase];
+#else
+	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
+	rbdf = (cbd_t *)&ip->im_dprambase[up->smc_rbase];
+#endif
+
+	/* 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);
+}
+
+void
+serial_putc(void *ignored, const char c)
+{
+	volatile cbd_t		*tbdf;
+	volatile char		*buf;
+#ifdef SCC_CONSOLE
+	volatile scc_uart_t	*sup;
+#else
+	volatile smc_uart_t	*up;
+#endif
+	volatile cpm2_map_t	*ip;
+
+	ip = (cpm2_map_t *)CPM_MAP_ADDR;
+#ifdef SCC_CONSOLE
+	sup = (scc_uart_t *)&ip->im_dprambase[PROFF_SCC1 + ((SCC_CONSOLE-1) << 8)];
+	tbdf = (cbd_t *)&ip->im_dprambase[sup->scc_genscc.scc_tbase];
+#else
+	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
+	tbdf = (cbd_t *)&ip->im_dprambase[up->smc_tbase];
+#endif
+
+	/* 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(void *ignored)
+{
+	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_tstc(void *ignored)
+{
+	volatile cbd_t		*rbdf;
+#ifdef SCC_CONSOLE
+	volatile scc_uart_t	*sup;
+#else
+	volatile smc_uart_t	*up;
+#endif
+	volatile cpm2_map_t	*ip;
+
+	ip = (cpm2_map_t *)CPM_MAP_ADDR;
+#ifdef SCC_CONSOLE
+	sup = (scc_uart_t *)&ip->im_dprambase[PROFF_SCC1 + ((SCC_CONSOLE-1) << 8)];
+	rbdf = (cbd_t *)&ip->im_dprambase[sup->scc_genscc.scc_rbase];
+#else
+	up = (smc_uart_t *)&(ip->im_dprambase[PROFF_SMC1]);
+	rbdf = (cbd_t *)&ip->im_dprambase[up->smc_rbase];
+#endif
+
+	return(!(rbdf->cbd_sc & BD_SC_EMPTY));
+}