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/*
* BK Id: SCCS/s.m8260_tty.c 1.7 05/18/01 07:54:04 patch
*/
/* 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;
/* 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.
*/
#ifdef CONFIG_SCC_CONSOLE
#define SCC_CONSOLE 1
#endif
void
serial_init(bd_t *bd)
{
volatile smc_t *sp;
volatile smc_uart_t *up;
volatile scc_t *sccp;
volatile scc_uart_t *sup;
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;
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_pmsr = 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
}
void
serial_putc(void *ignored, const char c)
{
volatile cbd_t *tbdf;
volatile char *buf;
volatile smc_uart_t *up;
volatile scc_uart_t *sup;
volatile immap_t *ip;
extern bd_t *board_info;
ip = (immap_t *)IMAP_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_readbuf(u_char *cbuf)
{
volatile cbd_t *rbdf;
volatile char *buf;
volatile smc_uart_t *up;
volatile scc_uart_t *sup;
volatile immap_t *ip;
int i, nc;
ip = (immap_t *)IMAP_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);
}
int
serial_tstc(void *ignored)
{
volatile cbd_t *rbdf;
volatile smc_uart_t *up;
volatile scc_uart_t *sup;
volatile immap_t *ip;
ip = (immap_t *)IMAP_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));
}
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