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u-boot/arch/powerpc/cpu/mpc8260/serial_scc.c
Stefan Roese a47a12becf Move arch/ppc to arch/powerpc 
As discussed on the list, move "arch/ppc" to "arch/powerpc" to
better match the Linux directory structure.

Please note that this patch also changes the "ppc" target in
MAKEALL to "powerpc" to match this new infrastructure. But "ppc"
is kept as an alias for now, to not break compatibility with
scripts using this name.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Wolfgang Denk <wd@denx.de>
Acked-by: Detlev Zundel <dzu@denx.de>
Acked-by: Kim Phillips <kim.phillips@freescale.com>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Anatolij Gustschin <agust@denx.de>
2010-04-21 23:42:38 +02:00

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/*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
* Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00.
*/
/*
* Minimal serial functions needed to use one of the SCC ports
* as serial console interface.
*/
#include <common.h>
#include <mpc8260.h>
#include <asm/cpm_8260.h>
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_CONS_ON_SCC)
#if CONFIG_CONS_INDEX == 1 /* Console on SCC1 */
#define SCC_INDEX 0
#define PROFF_SCC PROFF_SCC1
#define CMXSCR_MASK (CMXSCR_GR1|CMXSCR_SC1|\
CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK)
#define CMXSCR_VALUE (CMXSCR_RS1CS_BRG1|CMXSCR_TS1CS_BRG1)
#define CPM_CR_SCC_PAGE CPM_CR_SCC1_PAGE
#define CPM_CR_SCC_SBLOCK CPM_CR_SCC1_SBLOCK
#elif CONFIG_CONS_INDEX == 2 /* Console on SCC2 */
#define SCC_INDEX 1
#define PROFF_SCC PROFF_SCC2
#define CMXSCR_MASK (CMXSCR_GR2|CMXSCR_SC2|\
CMXSCR_RS2CS_MSK|CMXSCR_TS2CS_MSK)
#define CMXSCR_VALUE (CMXSCR_RS2CS_BRG2|CMXSCR_TS2CS_BRG2)
#define CPM_CR_SCC_PAGE CPM_CR_SCC2_PAGE
#define CPM_CR_SCC_SBLOCK CPM_CR_SCC2_SBLOCK
#elif CONFIG_CONS_INDEX == 3 /* Console on SCC3 */
#define SCC_INDEX 2
#define PROFF_SCC PROFF_SCC3
#define CMXSCR_MASK (CMXSCR_GR3|CMXSCR_SC3|\
CMXSCR_RS3CS_MSK|CMXSCR_TS3CS_MSK)
#define CMXSCR_VALUE (CMXSCR_RS3CS_BRG3|CMXSCR_TS3CS_BRG3)
#define CPM_CR_SCC_PAGE CPM_CR_SCC3_PAGE
#define CPM_CR_SCC_SBLOCK CPM_CR_SCC3_SBLOCK
#elif CONFIG_CONS_INDEX == 4 /* Console on SCC4 */
#define SCC_INDEX 3
#define PROFF_SCC PROFF_SCC4
#define CMXSCR_MASK (CMXSCR_GR4|CMXSCR_SC4|\
CMXSCR_RS4CS_MSK|CMXSCR_TS4CS_MSK)
#define CMXSCR_VALUE (CMXSCR_RS4CS_BRG4|CMXSCR_TS4CS_BRG4)
#define CPM_CR_SCC_PAGE CPM_CR_SCC4_PAGE
#define CPM_CR_SCC_SBLOCK CPM_CR_SCC4_SBLOCK
#else
#error "console not correctly defined"
#endif
int serial_init (void)
{
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile scc_t *sp;
volatile scc_uart_t *up;
volatile cbd_t *tbdf, *rbdf;
volatile cpm8260_t *cp = &(im->im_cpm);
uint dpaddr;
/* initialize pointers to SCC */
sp = (scc_t *) &(im->im_scc[SCC_INDEX]);
up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
/* Disable transmitter/receiver.
*/
sp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
/* put the SCC channel into NMSI (non multiplexd serial interface)
* mode and wire the selected SCC Tx and Rx clocks to BRGx (15-15).
*/
im->im_cpmux.cmx_scr = (im->im_cpmux.cmx_scr&~CMXSCR_MASK)|CMXSCR_VALUE;
/* Set up the baud rate generator.
*/
serial_setbrg ();
/* 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 = BD_SC_EMPTY | BD_SC_WRAP;
tbdf = rbdf + 1;
tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
tbdf->cbd_sc = BD_SC_WRAP;
/* Set up the uart parameters in the parameter ram.
*/
up->scc_genscc.scc_rbase = dpaddr;
up->scc_genscc.scc_tbase = dpaddr+sizeof(cbd_t);
up->scc_genscc.scc_rfcr = CPMFCR_EB;
up->scc_genscc.scc_tfcr = CPMFCR_EB;
up->scc_genscc.scc_mrblr = 1;
up->scc_maxidl = 0;
up->scc_brkcr = 1;
up->scc_parec = 0;
up->scc_frmec = 0;
up->scc_nosec = 0;
up->scc_brkec = 0;
up->scc_uaddr1 = 0;
up->scc_uaddr2 = 0;
up->scc_toseq = 0;
up->scc_char1 = up->scc_char2 = up->scc_char3 = up->scc_char4 = 0x8000;
up->scc_char5 = up->scc_char6 = up->scc_char7 = up->scc_char8 = 0x8000;
up->scc_rccm = 0xc0ff;
/* Mask all interrupts and remove anything pending.
*/
sp->scc_sccm = 0;
sp->scc_scce = 0xffff;
/* Set 8 bit FIFO, 16 bit oversampling and UART mode.
*/
sp->scc_gsmrh = SCC_GSMRH_RFW; /* 8 bit FIFO */
sp->scc_gsmrl = \
SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART;
/* Set CTS flow control, 1 stop bit, 8 bit character length,
* normal async UART mode, no parity
*/
sp->scc_psmr = SCU_PSMR_FLC | SCU_PSMR_CL;
/* execute the "Init Rx and Tx params" CP command.
*/
while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
cp->cp_cpcr = mk_cr_cmd(CPM_CR_SCC_PAGE, CPM_CR_SCC_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->scc_gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT;
return (0);
}
void
serial_setbrg (void)
{
#if defined(CONFIG_CONS_USE_EXTC)
m8260_cpm_extcbrg(SCC_INDEX, gd->baudrate,
CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL);
#else
m8260_cpm_setbrg(SCC_INDEX, gd->baudrate);
#endif
}
void
serial_putc(const char c)
{
volatile scc_uart_t *up;
volatile cbd_t *tbdf;
volatile immap_t *im;
if (c == '\n')
serial_putc ('\r');
im = (immap_t *)CONFIG_SYS_IMMR;
up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
tbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_tbase];
/* Wait for last character to go.
*/
while (tbdf->cbd_sc & BD_SC_READY)
;
/* Load the character into the transmit buffer.
*/
*(volatile char *)tbdf->cbd_bufaddr = c;
tbdf->cbd_datlen = 1;
tbdf->cbd_sc |= BD_SC_READY;
}
void
serial_puts (const char *s)
{
while (*s) {
serial_putc (*s++);
}
}
int
serial_getc(void)
{
volatile cbd_t *rbdf;
volatile scc_uart_t *up;
volatile immap_t *im;
unsigned char c;
im = (immap_t *)CONFIG_SYS_IMMR;
up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
/* Wait for character to show up.
*/
while (rbdf->cbd_sc & BD_SC_EMPTY)
;
/* Grab the char and clear the buffer again.
*/
c = *(volatile unsigned char *)rbdf->cbd_bufaddr;
rbdf->cbd_sc |= BD_SC_EMPTY;
return (c);
}
int
serial_tstc()
{
volatile cbd_t *rbdf;
volatile scc_uart_t *up;
volatile immap_t *im;
im = (immap_t *)CONFIG_SYS_IMMR;
up = (scc_uart_t *)&im->im_dprambase[PROFF_SCC];
rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
return ((rbdf->cbd_sc & BD_SC_EMPTY) == 0);
}
#endif /* CONFIG_CONS_ON_SCC */
#if defined(CONFIG_KGDB_ON_SCC)
#if defined(CONFIG_CONS_ON_SCC) && CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
#error Whoops! serial console and kgdb are on the same scc serial port
#endif
#if CONFIG_KGDB_INDEX == 1 /* KGDB Port on SCC1 */
#define KGDB_SCC_INDEX 0
#define KGDB_PROFF_SCC PROFF_SCC1
#define KGDB_CMXSCR_MASK (CMXSCR_GR1|CMXSCR_SC1|\
CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK)
#define KGDB_CMXSCR_VALUE (CMXSCR_RS1CS_BRG1|CMXSCR_TS1CS_BRG1)
#define KGDB_CPM_CR_SCC_PAGE CPM_CR_SCC1_PAGE
#define KGDB_CPM_CR_SCC_SBLOCK CPM_CR_SCC1_SBLOCK
#elif CONFIG_KGDB_INDEX == 2 /* KGDB Port on SCC2 */
#define KGDB_SCC_INDEX 1
#define KGDB_PROFF_SCC PROFF_SCC2
#define KGDB_CMXSCR_MASK (CMXSCR_GR2|CMXSCR_SC2|\
CMXSCR_RS2CS_MSK|CMXSCR_TS2CS_MSK)
#define KGDB_CMXSCR_VALUE (CMXSCR_RS2CS_BRG2|CMXSCR_TS2CS_BRG2)
#define KGDB_CPM_CR_SCC_PAGE CPM_CR_SCC2_PAGE
#define KGDB_CPM_CR_SCC_SBLOCK CPM_CR_SCC2_SBLOCK
#elif CONFIG_KGDB_INDEX == 3 /* KGDB Port on SCC3 */
#define KGDB_SCC_INDEX 2
#define KGDB_PROFF_SCC PROFF_SCC3
#define KGDB_CMXSCR_MASK (CMXSCR_GR3|CMXSCR_SC3|\
CMXSCR_RS3CS_MSK|CMXSCR_TS3CS_MSK)
#define KGDB_CMXSCR_VALUE (CMXSCR_RS3CS_BRG3|CMXSCR_TS3CS_BRG3)
#define KGDB_CPM_CR_SCC_PAGE CPM_CR_SCC3_PAGE
#define KGDB_CPM_CR_SCC_SBLOCK CPM_CR_SCC3_SBLOCK
#elif CONFIG_KGDB_INDEX == 4 /* KGDB Port on SCC4 */
#define KGDB_SCC_INDEX 3
#define KGDB_PROFF_SCC PROFF_SCC4
#define KGDB_CMXSCR_MASK (CMXSCR_GR4|CMXSCR_SC4|\
CMXSCR_RS4CS_MSK|CMXSCR_TS4CS_MSK)
#define KGDB_CMXSCR_VALUE (CMXSCR_RS4CS_BRG4|CMXSCR_TS4CS_BRG4)
#define KGDB_CPM_CR_SCC_PAGE CPM_CR_SCC4_PAGE
#define KGDB_CPM_CR_SCC_SBLOCK CPM_CR_SCC4_SBLOCK
#else
#error "kgdb serial port not correctly defined"
#endif
void
kgdb_serial_init (void)
{
volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
volatile scc_t *sp;
volatile scc_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 SCC */
sp = (scc_t *) &(im->im_scc[KGDB_SCC_INDEX]);
up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
/* Disable transmitter/receiver.
*/
sp->scc_gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
/* put the SCC channel into NMSI (non multiplexd serial interface)
* mode and wire the selected SCC Tx and Rx clocks to BRGx (15-15).
*/
im->im_cpmux.cmx_scr = \
(im->im_cpmux.cmx_scr & ~KGDB_CMXSCR_MASK) | KGDB_CMXSCR_VALUE;
/* Set up the baud rate generator.
*/
#if defined(CONFIG_KGDB_USE_EXTC)
m8260_cpm_extcbrg(KGDB_SCC_INDEX, speed,
CONFIG_KGDB_EXTC_RATE, CONFIG_KGDB_EXTC_PINSEL);
#else
m8260_cpm_setbrg(KGDB_SCC_INDEX, speed);
#endif
/* 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 = BD_SC_EMPTY | BD_SC_WRAP;
tbdf = rbdf + 1;
tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
tbdf->cbd_sc = BD_SC_WRAP;
/* Set up the uart parameters in the parameter ram.
*/
up->scc_genscc.scc_rbase = dpaddr;
up->scc_genscc.scc_tbase = dpaddr+sizeof(cbd_t);
up->scc_genscc.scc_rfcr = CPMFCR_EB;
up->scc_genscc.scc_tfcr = CPMFCR_EB;
up->scc_genscc.scc_mrblr = 1;
up->scc_maxidl = 0;
up->scc_brkcr = 1;
up->scc_parec = 0;
up->scc_frmec = 0;
up->scc_nosec = 0;
up->scc_brkec = 0;
up->scc_uaddr1 = 0;
up->scc_uaddr2 = 0;
up->scc_toseq = 0;
up->scc_char1 = up->scc_char2 = up->scc_char3 = up->scc_char4 = 0x8000;
up->scc_char5 = up->scc_char6 = up->scc_char7 = up->scc_char8 = 0x8000;
up->scc_rccm = 0xc0ff;
/* Mask all interrupts and remove anything pending.
*/
sp->scc_sccm = 0;
sp->scc_scce = 0xffff;
/* Set 8 bit FIFO, 16 bit oversampling and UART mode.
*/
sp->scc_gsmrh = SCC_GSMRH_RFW; /* 8 bit FIFO */
sp->scc_gsmrl = \
SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART;
/* Set CTS flow control, 1 stop bit, 8 bit character length,
* normal async UART mode, no parity
*/
sp->scc_psmr = SCU_PSMR_FLC | SCU_PSMR_CL;
/* execute the "Init Rx and Tx params" CP command.
*/
while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
cp->cp_cpcr = mk_cr_cmd(KGDB_CPM_CR_SCC_PAGE, KGDB_CPM_CR_SCC_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->scc_gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT;
printf("SCC%d at %dbps ", CONFIG_KGDB_INDEX, speed);
}
void
putDebugChar(const char c)
{
volatile scc_uart_t *up;
volatile cbd_t *tbdf;
volatile immap_t *im;
if (c == '\n')
putDebugChar ('\r');
im = (immap_t *)CONFIG_SYS_IMMR;
up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
tbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_tbase];
/* Wait for last character to go.
*/
while (tbdf->cbd_sc & BD_SC_READY)
;
/* Load the character into the transmit buffer.
*/
*(volatile char *)tbdf->cbd_bufaddr = 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 scc_uart_t *up;
volatile immap_t *im;
unsigned char c;
im = (immap_t *)CONFIG_SYS_IMMR;
up = (scc_uart_t *)&im->im_dprambase[KGDB_PROFF_SCC];
rbdf = (cbd_t *)&im->im_dprambase[up->scc_genscc.scc_rbase];
/* Wait for character to show up.
*/
while (rbdf->cbd_sc & BD_SC_EMPTY)
;
/* Grab the char and clear the buffer again.
*/
c = *(volatile unsigned char *)rbdf->cbd_bufaddr;
rbdf->cbd_sc |= BD_SC_EMPTY;
return (c);
}
void
kgdb_interruptible(int yes)
{
return;
}
#endif /* CONFIG_KGDB_ON_SCC */
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