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/* 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.
*
* Later versions (at least 1.4, maybe earlier) of the MBX EPPC-Bug
* use COM1 instead of SMC1 as the console port. This kinda sucks
* for the rest of the kernel, so here we force the use of SMC1 again.
* I f**ked around for a day trying to figure out how to make EPPC-Bug
* use SMC1, but gave up and decided to fix it here.
*/
#include <linux/config.h>
#include <linux/types.h>
#ifdef CONFIG_MBX
#include <asm/mbx.h>
#endif
#ifdef CONFIG_FADS
#include <asm/fads.h>
#endif
#include "../8xx_io/commproc.h"
#ifdef CONFIG_MBX
#define MBX_CSR1 ((volatile u_char *)0xfa100000)
#define CSR1_COMEN (u_char)0x02
#endif
static cpm8xx_t *cpmp = (cpm8xx_t *)&(((immap_t *)IMAP_ADDR)->im_cpm);
void
serial_init(bd_t *bd)
{
volatile smc_t *sp;
volatile smc_uart_t *up;
volatile cbd_t *tbdf, *rbdf;
volatile cpm8xx_t *cp;
uint dpaddr, memaddr;
cp = cpmp;
sp = (smc_t*)&(cp->cp_smc[0]);
up = (smc_uart_t *)&cp->cp_dparam[PROFF_SMC1];
/* Disable transmitter/receiver.
*/
sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
#ifdef CONFIG_MBX
if (*MBX_CSR1 & CSR1_COMEN) {
/* COM1 is enabled. Initialize SMC1 and use it for
* the console port.
*/
/* Enable SDMA.
*/
((immap_t *)IMAP_ADDR)->im_siu_conf.sc_sdcr = 1;
/* Use Port B for SMCs instead of other functions.
*/
cp->cp_pbpar |= 0x00000cc0;
cp->cp_pbdir &= ~0x00000cc0;
cp->cp_pbodr &= ~0x00000cc0;
/* 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. EPPC-Bug isn't
* running any more, so we can do this.
*/
memaddr = (bd->bi_memsize - 32) & ~15;
/* Set the physical address of the host memory buffers in
* the buffer descriptors.
*/
rbdf = (cbd_t *)&cp->cp_dpmem[dpaddr];
rbdf->cbd_bufaddr = memaddr;
rbdf->cbd_sc = 0;
tbdf = rbdf + 1;
tbdf->cbd_bufaddr = memaddr+4;
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;
/* 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.
* See 8xx_io/commproc.c for details.
*/
cp->cp_simode = 0x10000000;
cp->cp_brgc1 =
((((bd->bi_intfreq * 1000000)/16) / 9600) << 1) | CPM_BRG_EN;
/* Enable SMC1 for console output.
*/
*MBX_CSR1 &= ~CSR1_COMEN;
}
else {
#endif
/* SMC1 is used as console port.
*/
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);
#ifdef CONFIG_MBX
}
#endif
/* 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_smcmr |= 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));
}
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