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u-boot/arch/powerpc/cpu/mpc8260/serial_smc.c
Wolfgang Denk 1a4596601f Add GPL-2.0+ SPDX-License-Identifier to source files 
Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
2013-07-24 09:44:38 -04:00

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/*
* (C) Copyright 2000, 2001, 2002
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* SPDX-License-Identifier: GPL-2.0+
*
* Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
* changes based on the file arch/powerpc/mbxboot/m8260_tty.c from the
* Linux/PPC sources (m8260_tty.c had no copyright info in it).
*/
/*
* Minimal serial functions needed to use one of the SMC ports
* as serial console interface.
*/
#include <common.h>
#include <mpc8260.h>
#include <asm/cpm_8260.h>
#include <serial.h>
#include <linux/compiler.h>
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_CONS_ON_SMC)
#if CONFIG_CONS_INDEX == 1 /* Console on SMC1 */
#define SMC_INDEX 0
#define PROFF_SMC_BASE PROFF_SMC1_BASE
#define PROFF_SMC PROFF_SMC1
#define CPM_CR_SMC_PAGE CPM_CR_SMC1_PAGE
#define CPM_CR_SMC_SBLOCK CPM_CR_SMC1_SBLOCK
#define CMXSMR_MASK (CMXSMR_SMC1|CMXSMR_SMC1CS_MSK)
#define CMXSMR_VALUE CMXSMR_SMC1CS_BRG7
#elif CONFIG_CONS_INDEX == 2 /* Console on SMC2 */
#define SMC_INDEX 1
#define PROFF_SMC_BASE PROFF_SMC2_BASE
#define PROFF_SMC PROFF_SMC2
#define CPM_CR_SMC_PAGE CPM_CR_SMC2_PAGE
#define CPM_CR_SMC_SBLOCK CPM_CR_SMC2_SBLOCK
#define CMXSMR_MASK (CMXSMR_SMC2|CMXSMR_SMC2CS_MSK)
#define CMXSMR_VALUE CMXSMR_SMC2CS_BRG8
#else
#error "console not correctly defined"
#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 */
7, /* BRG8 for SMC2 */
0, /* BRG1 for SCC1 */
1, /* BRG1 for SCC2 */
2, /* BRG1 for SCC3 */
3, /* BRG1 for SCC4 */
};
static int mpc8260_smc_serial_init(void)
{
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile smc_t *sp;
volatile smc_uart_t *up;
volatile cpm8260_t *cp = &(im->im_cpm);
uint dpaddr;
volatile serialbuffer_t *rtx;
/* initialize pointers to SMC */
sp = (smc_t *) &(im->im_smc[SMC_INDEX]);
im->im_dprambase16[PROFF_SMC_BASE / sizeof(u16)] = PROFF_SMC;
up = (smc_uart_t *)&im->im_dprambase[PROFF_SMC];
/* Disable transmitter/receiver. */
sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
/* NOTE: I/O port pins are set up via the iop_conf_tab[] table */
/* Allocate space for two buffer descriptors in the DP ram.
* damm: allocating space after the two buffers for rx/tx data
*/
/* 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.
*/
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. */
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;
/* 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;
/* put the SMC channel into NMSI (non multiplexd serial interface)
* mode and wire either BRG7 to SMC1 or BRG8 to SMC2 (15-17).
*/
im->im_cpmux.cmx_smr = (im->im_cpmux.cmx_smr&~CMXSMR_MASK)|CMXSMR_VALUE;
/* Set up the baud rate generator. */
serial_setbrg ();
/* Make the first buffer the only buffer. */
rtx->txbd.cbd_sc |= BD_SC_WRAP;
rtx->rxbd.cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
/* single/multi character receive. */
up->smc_mrblr = CONFIG_SYS_SMC_RXBUFLEN;
up->smc_maxidl = CONFIG_SYS_MAXIDLE;
rtx->rxindex = 0;
/* Initialize Tx/Rx parameters. */
while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
cp->cp_cpcr = mk_cr_cmd(CPM_CR_SMC_PAGE, CPM_CR_SMC_SBLOCK,
0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
/* Enable transmitter/receiver. */
sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
return (0);
}
static void mpc8260_smc_serial_setbrg(void)
{
#if defined(CONFIG_CONS_USE_EXTC)
m8260_cpm_extcbrg(brg_map[SMC_INDEX], gd->baudrate,
CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL);
#else
m8260_cpm_setbrg(brg_map[SMC_INDEX], gd->baudrate);
#endif
}
static void mpc8260_smc_serial_putc(const char c)
{
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]);
rtx = (serialbuffer_t *)&im->im_dprambase[up->smc_rbase];
/* Wait for last character to go. */
while (rtx->txbd.cbd_sc & BD_SC_READY & BD_SC_READY)
;
rtx->txbuf = c;
rtx->txbd.cbd_datlen = 1;
rtx->txbd.cbd_sc |= BD_SC_READY;
}
static int mpc8260_smc_serial_getc(void)
{
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile serialbuffer_t *rtx;
unsigned char c;
up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
rtx = (serialbuffer_t *)&im->im_dprambase[up->smc_rbase];
/* Wait for character to show up. */
while (rtx->rxbd.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 mpc8260_smc_serial_tstc(void)
{
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];
return !(rtx->rxbd.cbd_sc & BD_SC_EMPTY);
}
static struct serial_device mpc8260_smc_serial_drv = {
.name = "mpc8260_smc_uart",
.start = mpc8260_smc_serial_init,
.stop = NULL,
.setbrg = mpc8260_smc_serial_setbrg,
.putc = mpc8260_smc_serial_putc,
.puts = default_serial_puts,
.getc = mpc8260_smc_serial_getc,
.tstc = mpc8260_smc_serial_tstc,
};
void mpc8260_smc_serial_initialize(void)
{
serial_register(&mpc8260_smc_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &mpc8260_smc_serial_drv;
}
#endif /* CONFIG_CONS_ON_SMC */
#if defined(CONFIG_KGDB_ON_SMC)
#if defined(CONFIG_CONS_ON_SMC) && CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
#error Whoops! serial console and kgdb are on the same smc serial port
#endif
#if CONFIG_KGDB_INDEX == 1 /* KGDB Port on SMC1 */
#define KGDB_SMC_INDEX 0
#define KGDB_PROFF_SMC_BASE PROFF_SMC1_BASE
#define KGDB_PROFF_SMC PROFF_SMC1
#define KGDB_CPM_CR_SMC_PAGE CPM_CR_SMC1_PAGE
#define KGDB_CPM_CR_SMC_SBLOCK CPM_CR_SMC1_SBLOCK
#define KGDB_CMXSMR_MASK (CMXSMR_SMC1|CMXSMR_SMC1CS_MSK)
#define KGDB_CMXSMR_VALUE CMXSMR_SMC1CS_BRG7
#elif CONFIG_KGDB_INDEX == 2 /* KGDB Port on SMC2 */
#define KGDB_SMC_INDEX 1
#define KGDB_PROFF_SMC_BASE PROFF_SMC2_BASE
#define KGDB_PROFF_SMC PROFF_SMC2
#define KGDB_CPM_CR_SMC_PAGE CPM_CR_SMC2_PAGE
#define KGDB_CPM_CR_SMC_SBLOCK CPM_CR_SMC2_SBLOCK
#define KGDB_CMXSMR_MASK (CMXSMR_SMC2|CMXSMR_SMC2CS_MSK)
#define KGDB_CMXSMR_VALUE CMXSMR_SMC2CS_BRG8
#else
#error "console not correctly defined"
#endif
void
kgdb_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, speed = CONFIG_KGDB_BAUDRATE;
char *s, *e;
if ((s = getenv("kgdbrate")) != NULL && *s != '\0') {
ulong rate = simple_strtoul(s, &e, 10);
if (e > s && *e == '\0')
speed = rate;
}
/* initialize pointers to SMC */
sp = (smc_t *) &(im->im_smc[KGDB_SMC_INDEX]);
im->im_dprambase16[KGDB_PROFF_SMC_BASE / sizeof(u16)] = KGDB_PROFF_SMC;
up = (smc_uart_t *)&im->im_dprambase[KGDB_PROFF_SMC];
/* Disable transmitter/receiver. */
sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
/* NOTE: I/O port pins are set up via the iop_conf_tab[] table */
/* Allocate space for two buffer descriptors in the DP ram.
* damm: allocating space after the two buffers for rx/tx data
*/
dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
/* 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;
/* Set up the uart parameters in the parameter ram. */
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;
/* 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;
/* put the SMC channel into NMSI (non multiplexd serial interface)
* mode and wire either BRG7 to SMC1 or BRG8 to SMC2 (15-17).
*/
im->im_cpmux.cmx_smr =
(im->im_cpmux.cmx_smr & ~KGDB_CMXSMR_MASK) | KGDB_CMXSMR_VALUE;
/* Set up the baud rate generator. */
#if defined(CONFIG_KGDB_USE_EXTC)
m8260_cpm_extcbrg(brg_map[KGDB_SMC_INDEX], speed,
CONFIG_KGDB_EXTC_RATE, CONFIG_KGDB_EXTC_PINSEL);
#else
m8260_cpm_setbrg(brg_map[KGDB_SMC_INDEX], speed);
#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. */
while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
cp->cp_cpcr = mk_cr_cmd(KGDB_CPM_CR_SMC_PAGE, KGDB_CPM_CR_SMC_SBLOCK,
0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
/* Enable transmitter/receiver. */
sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
printf("SMC%d at %dbps ", CONFIG_KGDB_INDEX, speed);
}
void
putDebugChar(const char c)
{
volatile cbd_t *tbdf;
volatile char *buf;
volatile smc_uart_t *up;
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
if (c == '\n')
putDebugChar ('\r');
up = (smc_uart_t *)&(im->im_dprambase[KGDB_PROFF_SMC]);
tbdf = (cbd_t *)&im->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;
}
void
putDebugStr (const char *s)
{
while (*s) {
putDebugChar (*s++);
}
}
int
getDebugChar(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;
up = (smc_uart_t *)&(im->im_dprambase[KGDB_PROFF_SMC]);
rbdf = (cbd_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)
;
c = *buf;
rbdf->cbd_sc |= BD_SC_EMPTY;
return(c);
}
void
kgdb_interruptible(int yes)
{
return;
}
#endif /* CONFIG_KGDB_ON_SMC */
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