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![Wolfgang Denk](/assets/img/avatar_default.png)
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Fixup common/cmd_io.c] Signed-off-by: Tom Rini <trini@ti.com>
462 lines
11 KiB
C
462 lines
11 KiB
C
/*
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* (C) Copyright 2000, 2001, 2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* SPDX-License-Identifier: GPL-2.0+
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*
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* Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00, with
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* changes based on the file arch/powerpc/mbxboot/m8260_tty.c from the
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* Linux/PPC sources (m8260_tty.c had no copyright info in it).
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*/
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/*
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* Minimal serial functions needed to use one of the SMC ports
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* as serial console interface.
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*/
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#include <common.h>
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#include <mpc8260.h>
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#include <asm/cpm_8260.h>
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#include <serial.h>
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#include <linux/compiler.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if defined(CONFIG_CONS_ON_SMC)
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#if CONFIG_CONS_INDEX == 1 /* Console on SMC1 */
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#define SMC_INDEX 0
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#define PROFF_SMC_BASE PROFF_SMC1_BASE
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#define PROFF_SMC PROFF_SMC1
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#define CPM_CR_SMC_PAGE CPM_CR_SMC1_PAGE
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#define CPM_CR_SMC_SBLOCK CPM_CR_SMC1_SBLOCK
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#define CMXSMR_MASK (CMXSMR_SMC1|CMXSMR_SMC1CS_MSK)
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#define CMXSMR_VALUE CMXSMR_SMC1CS_BRG7
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#elif CONFIG_CONS_INDEX == 2 /* Console on SMC2 */
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#define SMC_INDEX 1
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#define PROFF_SMC_BASE PROFF_SMC2_BASE
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#define PROFF_SMC PROFF_SMC2
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#define CPM_CR_SMC_PAGE CPM_CR_SMC2_PAGE
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#define CPM_CR_SMC_SBLOCK CPM_CR_SMC2_SBLOCK
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#define CMXSMR_MASK (CMXSMR_SMC2|CMXSMR_SMC2CS_MSK)
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#define CMXSMR_VALUE CMXSMR_SMC2CS_BRG8
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#else
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#error "console not correctly defined"
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#endif
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#if !defined(CONFIG_SYS_SMC_RXBUFLEN)
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#define CONFIG_SYS_SMC_RXBUFLEN 1
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#define CONFIG_SYS_MAXIDLE 0
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#else
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#if !defined(CONFIG_SYS_MAXIDLE)
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#error "you must define CONFIG_SYS_MAXIDLE"
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#endif
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#endif
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typedef volatile struct serialbuffer {
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cbd_t rxbd; /* Rx BD */
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cbd_t txbd; /* Tx BD */
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uint rxindex; /* index for next character to read */
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volatile uchar rxbuf[CONFIG_SYS_SMC_RXBUFLEN];/* rx buffers */
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volatile uchar txbuf; /* tx buffers */
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} serialbuffer_t;
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/* map rs_table index to baud rate generator index */
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static unsigned char brg_map[] = {
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6, /* BRG7 for SMC1 */
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7, /* BRG8 for SMC2 */
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0, /* BRG1 for SCC1 */
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1, /* BRG1 for SCC2 */
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2, /* BRG1 for SCC3 */
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3, /* BRG1 for SCC4 */
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};
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static int mpc8260_smc_serial_init(void)
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{
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volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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volatile smc_t *sp;
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volatile smc_uart_t *up;
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volatile cpm8260_t *cp = &(im->im_cpm);
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uint dpaddr;
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volatile serialbuffer_t *rtx;
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/* initialize pointers to SMC */
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sp = (smc_t *) &(im->im_smc[SMC_INDEX]);
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im->im_dprambase16[PROFF_SMC_BASE / sizeof(u16)] = PROFF_SMC;
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up = (smc_uart_t *)&im->im_dprambase[PROFF_SMC];
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/* Disable transmitter/receiver. */
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sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
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/* NOTE: I/O port pins are set up via the iop_conf_tab[] table */
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/* Allocate space for two buffer descriptors in the DP ram.
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* damm: allocating space after the two buffers for rx/tx data
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*/
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/* allocate size of struct serialbuffer with bd rx/tx,
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* buffer rx/tx and rx index
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*/
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dpaddr = m8260_cpm_dpalloc((sizeof(serialbuffer_t)), 16);
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rtx = (serialbuffer_t *)&im->im_dprambase[dpaddr];
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/* Set the physical address of the host memory buffers in
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* the buffer descriptors.
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*/
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rtx->rxbd.cbd_bufaddr = (uint) &rtx->rxbuf;
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rtx->rxbd.cbd_sc = 0;
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rtx->txbd.cbd_bufaddr = (uint) &rtx->txbuf;
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rtx->txbd.cbd_sc = 0;
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/* Set up the uart parameters in the parameter ram. */
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up->smc_rbase = dpaddr;
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up->smc_tbase = dpaddr+sizeof(cbd_t);
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up->smc_rfcr = CPMFCR_EB;
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up->smc_tfcr = CPMFCR_EB;
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up->smc_brklen = 0;
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up->smc_brkec = 0;
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up->smc_brkcr = 0;
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/* Set UART mode, 8 bit, no parity, one stop.
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* Enable receive and transmit.
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*/
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sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
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/* Mask all interrupts and remove anything pending. */
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sp->smc_smcm = 0;
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sp->smc_smce = 0xff;
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/* put the SMC channel into NMSI (non multiplexd serial interface)
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* mode and wire either BRG7 to SMC1 or BRG8 to SMC2 (15-17).
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*/
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im->im_cpmux.cmx_smr = (im->im_cpmux.cmx_smr&~CMXSMR_MASK)|CMXSMR_VALUE;
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/* Set up the baud rate generator. */
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serial_setbrg ();
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/* Make the first buffer the only buffer. */
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rtx->txbd.cbd_sc |= BD_SC_WRAP;
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rtx->rxbd.cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
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/* single/multi character receive. */
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up->smc_mrblr = CONFIG_SYS_SMC_RXBUFLEN;
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up->smc_maxidl = CONFIG_SYS_MAXIDLE;
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rtx->rxindex = 0;
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/* Initialize Tx/Rx parameters. */
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while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
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;
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cp->cp_cpcr = mk_cr_cmd(CPM_CR_SMC_PAGE, CPM_CR_SMC_SBLOCK,
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0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
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while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
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;
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/* Enable transmitter/receiver. */
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sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
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return (0);
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}
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static void mpc8260_smc_serial_setbrg(void)
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{
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#if defined(CONFIG_CONS_USE_EXTC)
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m8260_cpm_extcbrg(brg_map[SMC_INDEX], gd->baudrate,
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CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL);
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#else
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m8260_cpm_setbrg(brg_map[SMC_INDEX], gd->baudrate);
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#endif
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}
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static void mpc8260_smc_serial_putc(const char c)
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{
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volatile smc_uart_t *up;
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volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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volatile serialbuffer_t *rtx;
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if (c == '\n')
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serial_putc ('\r');
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up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
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rtx = (serialbuffer_t *)&im->im_dprambase[up->smc_rbase];
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/* Wait for last character to go. */
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while (rtx->txbd.cbd_sc & BD_SC_READY & BD_SC_READY)
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;
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rtx->txbuf = c;
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rtx->txbd.cbd_datlen = 1;
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rtx->txbd.cbd_sc |= BD_SC_READY;
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}
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static int mpc8260_smc_serial_getc(void)
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{
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volatile smc_uart_t *up;
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volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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volatile serialbuffer_t *rtx;
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unsigned char c;
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up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
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rtx = (serialbuffer_t *)&im->im_dprambase[up->smc_rbase];
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/* Wait for character to show up. */
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while (rtx->rxbd.cbd_sc & BD_SC_EMPTY)
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;
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/* the characters are read one by one,
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* use the rxindex to know the next char to deliver
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*/
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c = *(unsigned char *) (rtx->rxbd.cbd_bufaddr + rtx->rxindex);
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rtx->rxindex++;
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/* check if all char are readout, then make prepare for next receive */
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if (rtx->rxindex >= rtx->rxbd.cbd_datlen) {
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rtx->rxindex = 0;
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rtx->rxbd.cbd_sc |= BD_SC_EMPTY;
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}
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return(c);
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}
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static int mpc8260_smc_serial_tstc(void)
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{
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volatile smc_uart_t *up;
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volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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volatile serialbuffer_t *rtx;
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up = (smc_uart_t *)&(im->im_dprambase[PROFF_SMC]);
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rtx = (serialbuffer_t *)&im->im_dprambase[up->smc_rbase];
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return !(rtx->rxbd.cbd_sc & BD_SC_EMPTY);
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}
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static struct serial_device mpc8260_smc_serial_drv = {
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.name = "mpc8260_smc_uart",
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.start = mpc8260_smc_serial_init,
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.stop = NULL,
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.setbrg = mpc8260_smc_serial_setbrg,
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.putc = mpc8260_smc_serial_putc,
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.puts = default_serial_puts,
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.getc = mpc8260_smc_serial_getc,
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.tstc = mpc8260_smc_serial_tstc,
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};
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void mpc8260_smc_serial_initialize(void)
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{
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serial_register(&mpc8260_smc_serial_drv);
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}
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__weak struct serial_device *default_serial_console(void)
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{
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return &mpc8260_smc_serial_drv;
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}
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#endif /* CONFIG_CONS_ON_SMC */
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#if defined(CONFIG_KGDB_ON_SMC)
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#if defined(CONFIG_CONS_ON_SMC) && CONFIG_KGDB_INDEX == CONFIG_CONS_INDEX
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#error Whoops! serial console and kgdb are on the same smc serial port
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#endif
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#if CONFIG_KGDB_INDEX == 1 /* KGDB Port on SMC1 */
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#define KGDB_SMC_INDEX 0
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#define KGDB_PROFF_SMC_BASE PROFF_SMC1_BASE
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#define KGDB_PROFF_SMC PROFF_SMC1
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#define KGDB_CPM_CR_SMC_PAGE CPM_CR_SMC1_PAGE
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#define KGDB_CPM_CR_SMC_SBLOCK CPM_CR_SMC1_SBLOCK
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#define KGDB_CMXSMR_MASK (CMXSMR_SMC1|CMXSMR_SMC1CS_MSK)
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#define KGDB_CMXSMR_VALUE CMXSMR_SMC1CS_BRG7
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#elif CONFIG_KGDB_INDEX == 2 /* KGDB Port on SMC2 */
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#define KGDB_SMC_INDEX 1
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#define KGDB_PROFF_SMC_BASE PROFF_SMC2_BASE
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#define KGDB_PROFF_SMC PROFF_SMC2
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#define KGDB_CPM_CR_SMC_PAGE CPM_CR_SMC2_PAGE
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#define KGDB_CPM_CR_SMC_SBLOCK CPM_CR_SMC2_SBLOCK
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#define KGDB_CMXSMR_MASK (CMXSMR_SMC2|CMXSMR_SMC2CS_MSK)
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#define KGDB_CMXSMR_VALUE CMXSMR_SMC2CS_BRG8
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#else
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#error "console not correctly defined"
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#endif
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void
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kgdb_serial_init (void)
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{
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volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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volatile smc_t *sp;
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volatile smc_uart_t *up;
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volatile cbd_t *tbdf, *rbdf;
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volatile cpm8260_t *cp = &(im->im_cpm);
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uint dpaddr, speed = CONFIG_KGDB_BAUDRATE;
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char *s, *e;
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if ((s = getenv("kgdbrate")) != NULL && *s != '\0') {
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ulong rate = simple_strtoul(s, &e, 10);
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if (e > s && *e == '\0')
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speed = rate;
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}
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/* initialize pointers to SMC */
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sp = (smc_t *) &(im->im_smc[KGDB_SMC_INDEX]);
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im->im_dprambase16[KGDB_PROFF_SMC_BASE / sizeof(u16)] = KGDB_PROFF_SMC;
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up = (smc_uart_t *)&im->im_dprambase[KGDB_PROFF_SMC];
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/* Disable transmitter/receiver. */
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sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN);
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/* NOTE: I/O port pins are set up via the iop_conf_tab[] table */
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/* Allocate space for two buffer descriptors in the DP ram.
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* damm: allocating space after the two buffers for rx/tx data
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*/
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dpaddr = m8260_cpm_dpalloc((2 * sizeof (cbd_t)) + 2, 16);
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/* Set the physical address of the host memory buffers in
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* the buffer descriptors.
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*/
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rbdf = (cbd_t *)&im->im_dprambase[dpaddr];
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rbdf->cbd_bufaddr = (uint) (rbdf+2);
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rbdf->cbd_sc = 0;
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tbdf = rbdf + 1;
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tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1;
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tbdf->cbd_sc = 0;
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/* Set up the uart parameters in the parameter ram. */
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up->smc_rbase = dpaddr;
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up->smc_tbase = dpaddr+sizeof(cbd_t);
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up->smc_rfcr = CPMFCR_EB;
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up->smc_tfcr = CPMFCR_EB;
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up->smc_brklen = 0;
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up->smc_brkec = 0;
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up->smc_brkcr = 0;
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/* Set UART mode, 8 bit, no parity, one stop.
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* Enable receive and transmit.
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*/
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sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART;
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/* Mask all interrupts and remove anything pending. */
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sp->smc_smcm = 0;
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sp->smc_smce = 0xff;
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/* put the SMC channel into NMSI (non multiplexd serial interface)
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* mode and wire either BRG7 to SMC1 or BRG8 to SMC2 (15-17).
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*/
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im->im_cpmux.cmx_smr =
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(im->im_cpmux.cmx_smr & ~KGDB_CMXSMR_MASK) | KGDB_CMXSMR_VALUE;
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/* Set up the baud rate generator. */
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#if defined(CONFIG_KGDB_USE_EXTC)
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m8260_cpm_extcbrg(brg_map[KGDB_SMC_INDEX], speed,
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CONFIG_KGDB_EXTC_RATE, CONFIG_KGDB_EXTC_PINSEL);
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#else
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m8260_cpm_setbrg(brg_map[KGDB_SMC_INDEX], speed);
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#endif
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/* Make the first buffer the only buffer. */
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tbdf->cbd_sc |= BD_SC_WRAP;
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rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP;
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/* Single character receive. */
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up->smc_mrblr = 1;
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up->smc_maxidl = 0;
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/* Initialize Tx/Rx parameters. */
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while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
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;
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cp->cp_cpcr = mk_cr_cmd(KGDB_CPM_CR_SMC_PAGE, KGDB_CPM_CR_SMC_SBLOCK,
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0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
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while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */
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;
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/* Enable transmitter/receiver. */
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sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN;
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printf("SMC%d at %dbps ", CONFIG_KGDB_INDEX, speed);
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}
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void
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putDebugChar(const char c)
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{
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volatile cbd_t *tbdf;
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volatile char *buf;
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volatile smc_uart_t *up;
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volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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if (c == '\n')
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putDebugChar ('\r');
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up = (smc_uart_t *)&(im->im_dprambase[KGDB_PROFF_SMC]);
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tbdf = (cbd_t *)&im->im_dprambase[up->smc_tbase];
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/* Wait for last character to go. */
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buf = (char *)tbdf->cbd_bufaddr;
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while (tbdf->cbd_sc & BD_SC_READY)
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;
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*buf = c;
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tbdf->cbd_datlen = 1;
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tbdf->cbd_sc |= BD_SC_READY;
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}
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void
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putDebugStr (const char *s)
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{
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while (*s) {
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putDebugChar (*s++);
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}
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}
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int
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getDebugChar(void)
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{
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volatile cbd_t *rbdf;
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volatile unsigned char *buf;
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volatile smc_uart_t *up;
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volatile immap_t *im = (immap_t *)CONFIG_SYS_IMMR;
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unsigned char c;
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up = (smc_uart_t *)&(im->im_dprambase[KGDB_PROFF_SMC]);
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rbdf = (cbd_t *)&im->im_dprambase[up->smc_rbase];
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/* Wait for character to show up. */
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buf = (unsigned char *)rbdf->cbd_bufaddr;
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while (rbdf->cbd_sc & BD_SC_EMPTY)
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;
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c = *buf;
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rbdf->cbd_sc |= BD_SC_EMPTY;
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return(c);
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}
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void
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kgdb_interruptible(int yes)
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{
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return;
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}
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#endif /* CONFIG_KGDB_ON_SMC */
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