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/* 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));
}
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