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u-boot/arch/powerpc/cpu/mpc85xx/serial_scc.c
Tom Rini 83d290c56f SPDX: Convert all of our single license tags to Linux Kernel style 
When U-Boot started using SPDX tags we were among the early adopters and
there weren't a lot of other examples to borrow from.  So we picked the
area of the file that usually had a full license text and replaced it
with an appropriate SPDX-License-Identifier: entry.  Since then, the
Linux Kernel has adopted SPDX tags and they place it as the very first
line in a file (except where shebangs are used, then it's second line)
and with slightly different comment styles than us.

In part due to community overlap, in part due to better tag visibility
and in part for other minor reasons, switch over to that style.

This commit changes all instances where we have a single declared
license in the tag as both the before and after are identical in tag
contents.  There's also a few places where I found we did not have a tag
and have introduced one.

Signed-off-by: Tom Rini <trini@konsulko.com>
2018-05-07 09:34:12 -04:00

261 lines
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2003 Motorola Inc.
* Xianghua Xiao (X.Xiao@motorola.com)
* Modified based on 8260 for 8560.
*
* (C) Copyright 2000
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*
* 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 <asm/cpm_85xx.h>
#include <serial.h>
#include <linux/compiler.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
static int mpc85xx_serial_init(void)
{
volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
volatile ccsr_cpm_scc_t *sp;
volatile scc_uart_t *up;
volatile cbd_t *tbdf, *rbdf;
volatile ccsr_cpm_cp_t *cp = &(cpm->im_cpm_cp);
uint dpaddr;
/* initialize pointers to SCC */
sp = (ccsr_cpm_scc_t *) &(cpm->im_cpm_scc[SCC_INDEX]);
up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]);
/* Disable transmitter/receiver.
*/
sp->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).
*/
cpm->im_cpm_mux.cmxscr = \
(cpm->im_cpm_mux.cmxscr&~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 = m8560_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
/* Set the physical address of the host memory buffers in
* the buffer descriptors.
*/
rbdf = (cbd_t *)&(cpm->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->sccm = 0;
sp->scce = 0xffff;
/* Set 8 bit FIFO, 16 bit oversampling and UART mode.
*/
sp->gsmrh = SCC_GSMRH_RFW; /* 8 bit FIFO */
sp->gsmrl = \
SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART;
/* Set CTS no flow control, 1 stop bit, 8 bit character length,
* normal async UART mode, no parity
*/
sp->psmr = SCU_PSMR_CL;
/* execute the "Init Rx and Tx params" CP command.
*/
while (cp->cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
cp->cpcr = mk_cr_cmd(CPM_CR_SCC_PAGE, CPM_CR_SCC_SBLOCK,
0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
while (cp->cpcr & CPM_CR_FLG) /* wait if cp is busy */
;
/* Enable transmitter/receiver.
*/
sp->gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT;
return (0);
}
static void mpc85xx_serial_setbrg(void)
{
#if defined(CONFIG_CONS_USE_EXTC)
m8560_cpm_extcbrg(SCC_INDEX, gd->baudrate,
CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL);
#else
m8560_cpm_setbrg(SCC_INDEX, gd->baudrate);
#endif
}
static void mpc85xx_serial_putc(const char c)
{
volatile scc_uart_t *up;
volatile cbd_t *tbdf;
volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
if (c == '\n')
serial_putc ('\r');
up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]);
tbdf = (cbd_t *)&(cpm->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;
}
static int mpc85xx_serial_getc(void)
{
volatile cbd_t *rbdf;
volatile scc_uart_t *up;
volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
unsigned char c;
up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]);
rbdf = (cbd_t *)&(cpm->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);
}
static int mpc85xx_serial_tstc(void)
{
volatile cbd_t *rbdf;
volatile scc_uart_t *up;
volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]);
rbdf = (cbd_t *)&(cpm->im_dprambase[up->scc_genscc.scc_rbase]);
return ((rbdf->cbd_sc & BD_SC_EMPTY) == 0);
}
static struct serial_device mpc85xx_serial_drv = {
.name = "mpc85xx_serial",
.start = mpc85xx_serial_init,
.stop = NULL,
.setbrg = mpc85xx_serial_setbrg,
.putc = mpc85xx_serial_putc,
.puts = default_serial_puts,
.getc = mpc85xx_serial_getc,
.tstc = mpc85xx_serial_tstc,
};
void mpc85xx_serial_initialize(void)
{
serial_register(&mpc85xx_serial_drv);
}
__weak struct serial_device *default_serial_console(void)
{
return &mpc85xx_serial_drv;
}
#endif /* CONFIG_CONS_ON_SCC */
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