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82xx 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 82xx 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>
This commit is contained in:
Heiko Schocher 2009-01-30 12:55:38 +01:00 committed by Wolfgang Denk
parent bced7ccefa
commit c92fac91a0
2 changed files with 68 additions and 37 deletions
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8
README
View file

@ -484,6 +484,14 @@ The following options need to be configured:
CONFIG_SYS_BAUDRATE_TABLE, see below.
CONFIG_SYS_BRGCLK_PRESCALE, baudrate prescale
- 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.
If using CONFIG_SYS_SMC_RXBUFLEN also CONFIG_SYS_MAXIDLE
must be defined, to setup the maximum idle timeout for
the SMC.
- Interrupt driven serial port input:
CONFIG_SERIAL_SOFTWARE_FIFO

97
cpu/mpc8260/serial_smc.c
View file

@ -64,6 +64,23 @@ DECLARE_GLOBAL_DATA_PTR;
#endif
#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;
/* map rs_table index to baud rate generator index */
static unsigned char brg_map[] = {
6, /* BRG7 for SMC1 */
@ -79,9 +96,9 @@ int serial_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 cpm8260_t *cp = &(im->im_cpm);
uint dpaddr;
volatile serialbuffer_t *rtx;
/* initialize pointers to SMC */
@ -99,17 +116,21 @@ int serial_init (void)
* damm: allocating space after the two buffers for rx/tx data
*/
dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
/* allocate size of struct serialbuffer with bd rx/tx,
* buffer rx/tx and rx index
*/
dpaddr = m8260_cpm_dpalloc((sizeof(serialbuffer_t)), 16);
rtx = (serialbuffer_t *)&im->im_dprambase[dpaddr];
/* Set the physical address of the host memory buffers in
* the buffer descriptors.
*/
rbdf = (cbd_t *)&im->im_dprambase[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.
*/
@ -142,13 +163,13 @@ int serial_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.
*/
@ -183,27 +204,23 @@ serial_setbrg (void)
void
serial_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 serialbuffer_t *rtx;
if (c == '\n')
serial_putc ('\r');
up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
tbdf = (cbd_t *)&im->im_dprambase[up->smc_tbase];
rtx = (serialbuffer_t *)&im->im_dprambase[up->smc_rbase];
/* Wait for last character to go.
*/
buf = (char *)tbdf->cbd_bufaddr;
while (tbdf->cbd_sc & BD_SC_READY)
/* Wait for last character to go. */
while (rtx->txbd.cbd_sc & BD_SC_READY & BD_SC_READY)
;
*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;
}
void
@ -217,39 +234,45 @@ serial_puts (const char *s)
int
serial_getc(void)
{
volatile cbd_t *rbdf;
volatile unsigned char *buf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
unsigned char c;
volatile serialbuffer_t *rtx;
unsigned char c;
up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
rbdf = (cbd_t *)&im->im_dprambase[up->smc_rbase];
rtx = (serialbuffer_t *)&im->im_dprambase[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)
;
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);
}
int
serial_tstc()
{
volatile cbd_t *rbdf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile serialbuffer_t *rtx;
up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
rtx = (serialbuffer_t *)&im->im_dprambase[up->smc_rbase];
rbdf = (cbd_t *)&im->im_dprambase[up->smc_rbase];
return(!(rbdf->cbd_sc & BD_SC_EMPTY));
return !(rtx->rxbd.cbd_sc & BD_SC_EMPTY);
}
#endif /* CONFIG_CONS_ON_SMC */