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8xx serial, smc: add configurable SMC Rx buffer len

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This patch adds the configuration option CONFIG_SYS_SMC_RXBUFLEN.
With this option it is possible to allow the receive
buffer for the SMC on 8xx to be greater then 1. In case
CONFIG_SYS_SMC_RXBUFLEN == 1 this driver works as the
old version.

When defining CONFIG_SYS_SMC_RXBUFLEN also
CONFIG_SYS_MAXIDLE must be defined to setup the maximum
idle timeout for the SMC.

Signed-off-by: Heiko Schocher <hs@denx.de>
master
Heiko Schocher 16 years ago committed by Wolfgang Denk
parent e915f8bb73
commit 2b3f12c214
2 changed files with 58 additions and 38 deletions
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  1. 2
      README
  2. 94
      cpu/mpc8xx/serial.c

2
README
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@ -487,7 +487,7 @@ The following options need to be configured:
- Console Rx buffer length
With CONFIG_SYS_SMC_RXBUFLEN it is possible to define
the maximum receive buffer length for the SMC.
This option is actual only for 82xx possible.
This option is actual only for 82xx and 8xx possible.
If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
must be defined, to setup the maximum idle timeout for
the SMC.

94
cpu/mpc8xx/serial.c
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@ -65,6 +65,23 @@ DECLARE_GLOBAL_DATA_PTR;
#endif /* CONFIG_8xx_CONS_SCCx */
#if !defined(CONFIG_SYS_SMC_RXBUFLEN)
#define CONFIG_SYS_SMC_RXBUFLEN 1
#define CONFIG_SYS_MAXIDLE 0
#else
#if !defined(CONFIG_SYS_MAXIDLE)
#error "you must define CONFIG_SYS_MAXIDLE"
#endif
#endif
typedef volatile struct serialbuffer {
cbd_t rxbd; /* Rx BD */
cbd_t txbd; /* Tx BD */
uint rxindex; /* index for next character to read */
volatile uchar rxbuf[CONFIG_SYS_SMC_RXBUFLEN];/* rx buffers */
volatile uchar txbuf; /* tx buffers */
} serialbuffer_t;
static void serial_setdivisor(volatile cpm8xx_t *cp)
{
int divisor=(gd->cpu_clk + 8*gd->baudrate)/16/gd->baudrate;
@ -113,12 +130,12 @@ static int smc_init (void)
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile smc_t *sp;
volatile smc_uart_t *up;
volatile cbd_t *tbdf, *rbdf;
volatile cpm8xx_t *cp = &(im->im_cpm);
#if (!defined(CONFIG_8xx_CONS_SMC1)) && (defined(CONFIG_MPC823) || defined(CONFIG_MPC850))
volatile iop8xx_t *ip = (iop8xx_t *)&(im->im_ioport);
#endif
uint dpaddr;
volatile serialbuffer_t *rtx;
/* initialize pointers to SMC */
@ -194,23 +211,26 @@ static int smc_init (void)
*/
#ifdef CONFIG_SYS_ALLOC_DPRAM
dpaddr = dpram_alloc_align (sizeof(cbd_t)*2 + 2, 8) ;
/* allocate
* size of struct serialbuffer with bd rx/tx, buffer rx/tx and rx index
*/
dpaddr = dpram_alloc_align((sizeof(serialbuffer_t)), 8);
#else
dpaddr = CPM_SERIAL_BASE ;
#endif
rtx = (serialbuffer_t *)&cp->cp_dpmem[dpaddr];
/* 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.
* damm: allocating space after the two buffers for rx/tx data
*/
rbdf = (cbd_t *)&cp->cp_dpmem[dpaddr];
rbdf->cbd_bufaddr = (uint) (rbdf+2);
rbdf->cbd_sc = 0;
tbdf = rbdf + 1;
tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
tbdf->cbd_sc = 0;
rtx->rxbd.cbd_bufaddr = (uint) &rtx->rxbuf;
rtx->rxbd.cbd_sc = 0;
rtx->txbd.cbd_bufaddr = (uint) &rtx->txbuf;
rtx->txbd.cbd_sc = 0;
/* Set up the uart parameters in the parameter ram.
*/
@ -256,13 +276,13 @@ static int smc_init (void)
/* Make the first buffer the only buffer.
*/
tbdf->cbd_sc |= BD_SC_WRAP;
rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
rtx->txbd.cbd_sc |= BD_SC_WRAP;
rtx->rxbd.cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
/* Single character receive.
*/
up->smc_mrblr = 1;
up->smc_maxidl = 0;
/* single/multi character receive. */
up->smc_mrblr = CONFIG_SYS_SMC_RXBUFLEN;
up->smc_maxidl = CONFIG_SYS_MAXIDLE;
rtx->rxindex = 0;
/* Initialize Tx/Rx parameters.
*/
@ -285,11 +305,10 @@ static int smc_init (void)
static void
smc_putc(const char c)
{
volatile cbd_t *tbdf;
volatile char *buf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile cpm8xx_t *cpmp = &(im->im_cpm);
volatile serialbuffer_t *rtx;
#ifdef CONFIG_MODEM_SUPPORT
if (gd->be_quiet)
@ -304,19 +323,16 @@ smc_putc(const char c)
up = (smc_uart_t *) &cpmp->cp_dpmem[up->smc_rpbase];
#endif
tbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_tbase];
rtx = (serialbuffer_t *)&cpmp->cp_dpmem[up->smc_rbase];
/* Wait for last character to go.
*/
buf = (char *)tbdf->cbd_bufaddr;
*buf = c;
tbdf->cbd_datlen = 1;
tbdf->cbd_sc |= BD_SC_READY;
rtx->txbuf = c;
rtx->txbd.cbd_datlen = 1;
rtx->txbd.cbd_sc |= BD_SC_READY;
__asm__("eieio");
while (tbdf->cbd_sc & BD_SC_READY) {
while (rtx->txbd.cbd_sc & BD_SC_READY) {
WATCHDOG_RESET ();
__asm__("eieio");
}
@ -333,49 +349,53 @@ smc_puts (const char *s)
static int
smc_getc(void)
{
volatile cbd_t *rbdf;
volatile unsigned char *buf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile cpm8xx_t *cpmp = &(im->im_cpm);
unsigned char c;
volatile serialbuffer_t *rtx;
unsigned char c;
up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC];
#ifdef CONFIG_SYS_SMC_UCODE_PATCH
up = (smc_uart_t *) &cpmp->cp_dpmem[up->smc_rpbase];
#endif
rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
rtx = (serialbuffer_t *)&cpmp->cp_dpmem[up->smc_rbase];
/* Wait for character to show up.
*/
buf = (unsigned char *)rbdf->cbd_bufaddr;
while (rbdf->cbd_sc & BD_SC_EMPTY)
while (rtx->rxbd.cbd_sc & BD_SC_EMPTY)
WATCHDOG_RESET ();
c = *buf;
rbdf->cbd_sc |= BD_SC_EMPTY;
/* the characters are read one by one,
* use the rxindex to know the next char to deliver
*/
c = *(unsigned char *) (rtx->rxbd.cbd_bufaddr+rtx->rxindex);
rtx->rxindex++;
/* check if all char are readout, then make prepare for next receive */
if (rtx->rxindex >= rtx->rxbd.cbd_datlen) {
rtx->rxindex = 0;
rtx->rxbd.cbd_sc |= BD_SC_EMPTY;
}
return(c);
}
static int
smc_tstc(void)
{
volatile cbd_t *rbdf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile cpm8xx_t *cpmp = &(im->im_cpm);
volatile serialbuffer_t *rtx;
up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC];
#ifdef CONFIG_SYS_SMC_UCODE_PATCH
up = (smc_uart_t *) &cpmp->cp_dpmem[up->smc_rpbase];
#endif
rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase];
rtx = (serialbuffer_t *)&cpmp->cp_dpmem[up->smc_rbase];
return(!(rbdf->cbd_sc & BD_SC_EMPTY));
return !(rtx->rxbd.cbd_sc & BD_SC_EMPTY);
}
struct serial_device serial_smc_device =

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