262 lines
6.6 KiB
C
262 lines
6.6 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2003 Motorola Inc.
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* Xianghua Xiao (X.Xiao@motorola.com)
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* Modified based on 8260 for 8560.
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*
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* (C) Copyright 2000
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* Hacked for MPC8260 by Murray.Jensen@cmst.csiro.au, 19-Oct-00.
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*/
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/*
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* Minimal serial functions needed to use one of the SCC 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 <asm/cpm_85xx.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_SCC)
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#if CONFIG_CONS_INDEX == 1 /* Console on SCC1 */
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#define SCC_INDEX 0
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#define PROFF_SCC PROFF_SCC1
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#define CMXSCR_MASK (CMXSCR_GR1|CMXSCR_SC1|\
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CMXSCR_RS1CS_MSK|CMXSCR_TS1CS_MSK)
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#define CMXSCR_VALUE (CMXSCR_RS1CS_BRG1|CMXSCR_TS1CS_BRG1)
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#define CPM_CR_SCC_PAGE CPM_CR_SCC1_PAGE
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#define CPM_CR_SCC_SBLOCK CPM_CR_SCC1_SBLOCK
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#elif CONFIG_CONS_INDEX == 2 /* Console on SCC2 */
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#define SCC_INDEX 1
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#define PROFF_SCC PROFF_SCC2
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#define CMXSCR_MASK (CMXSCR_GR2|CMXSCR_SC2|\
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CMXSCR_RS2CS_MSK|CMXSCR_TS2CS_MSK)
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#define CMXSCR_VALUE (CMXSCR_RS2CS_BRG2|CMXSCR_TS2CS_BRG2)
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#define CPM_CR_SCC_PAGE CPM_CR_SCC2_PAGE
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#define CPM_CR_SCC_SBLOCK CPM_CR_SCC2_SBLOCK
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#elif CONFIG_CONS_INDEX == 3 /* Console on SCC3 */
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#define SCC_INDEX 2
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#define PROFF_SCC PROFF_SCC3
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#define CMXSCR_MASK (CMXSCR_GR3|CMXSCR_SC3|\
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CMXSCR_RS3CS_MSK|CMXSCR_TS3CS_MSK)
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#define CMXSCR_VALUE (CMXSCR_RS3CS_BRG3|CMXSCR_TS3CS_BRG3)
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#define CPM_CR_SCC_PAGE CPM_CR_SCC3_PAGE
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#define CPM_CR_SCC_SBLOCK CPM_CR_SCC3_SBLOCK
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#elif CONFIG_CONS_INDEX == 4 /* Console on SCC4 */
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#define SCC_INDEX 3
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#define PROFF_SCC PROFF_SCC4
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#define CMXSCR_MASK (CMXSCR_GR4|CMXSCR_SC4|\
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CMXSCR_RS4CS_MSK|CMXSCR_TS4CS_MSK)
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#define CMXSCR_VALUE (CMXSCR_RS4CS_BRG4|CMXSCR_TS4CS_BRG4)
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#define CPM_CR_SCC_PAGE CPM_CR_SCC4_PAGE
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#define CPM_CR_SCC_SBLOCK CPM_CR_SCC4_SBLOCK
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#else
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#error "console not correctly defined"
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#endif
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static int mpc85xx_serial_init(void)
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{
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volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
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volatile ccsr_cpm_scc_t *sp;
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volatile scc_uart_t *up;
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volatile cbd_t *tbdf, *rbdf;
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volatile ccsr_cpm_cp_t *cp = &(cpm->im_cpm_cp);
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uint dpaddr;
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/* initialize pointers to SCC */
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sp = (ccsr_cpm_scc_t *) &(cpm->im_cpm_scc[SCC_INDEX]);
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up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]);
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/* Disable transmitter/receiver.
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*/
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sp->gsmrl &= ~(SCC_GSMRL_ENR | SCC_GSMRL_ENT);
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/* put the SCC channel into NMSI (non multiplexd serial interface)
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* mode and wire the selected SCC Tx and Rx clocks to BRGx (15-15).
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*/
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cpm->im_cpm_mux.cmxscr = \
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(cpm->im_cpm_mux.cmxscr&~CMXSCR_MASK)|CMXSCR_VALUE;
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/* Set up the baud rate generator.
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*/
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serial_setbrg ();
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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 = m8560_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 *)&(cpm->im_dprambase[dpaddr]);
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rbdf->cbd_bufaddr = (uint) (rbdf+2);
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rbdf->cbd_sc = BD_SC_EMPTY | BD_SC_WRAP;
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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 = BD_SC_WRAP;
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/* Set up the uart parameters in the parameter ram.
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*/
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up->scc_genscc.scc_rbase = dpaddr;
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up->scc_genscc.scc_tbase = dpaddr+sizeof(cbd_t);
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up->scc_genscc.scc_rfcr = CPMFCR_EB;
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up->scc_genscc.scc_tfcr = CPMFCR_EB;
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up->scc_genscc.scc_mrblr = 1;
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up->scc_maxidl = 0;
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up->scc_brkcr = 1;
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up->scc_parec = 0;
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up->scc_frmec = 0;
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up->scc_nosec = 0;
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up->scc_brkec = 0;
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up->scc_uaddr1 = 0;
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up->scc_uaddr2 = 0;
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up->scc_toseq = 0;
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up->scc_char1 = up->scc_char2 = up->scc_char3 = up->scc_char4 = 0x8000;
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up->scc_char5 = up->scc_char6 = up->scc_char7 = up->scc_char8 = 0x8000;
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up->scc_rccm = 0xc0ff;
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/* Mask all interrupts and remove anything pending.
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*/
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sp->sccm = 0;
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sp->scce = 0xffff;
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/* Set 8 bit FIFO, 16 bit oversampling and UART mode.
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*/
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sp->gsmrh = SCC_GSMRH_RFW; /* 8 bit FIFO */
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sp->gsmrl = \
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SCC_GSMRL_TDCR_16 | SCC_GSMRL_RDCR_16 | SCC_GSMRL_MODE_UART;
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/* Set CTS no flow control, 1 stop bit, 8 bit character length,
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* normal async UART mode, no parity
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*/
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sp->psmr = SCU_PSMR_CL;
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/* execute the "Init Rx and Tx params" CP command.
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*/
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while (cp->cpcr & CPM_CR_FLG) /* wait if cp is busy */
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;
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cp->cpcr = mk_cr_cmd(CPM_CR_SCC_PAGE, CPM_CR_SCC_SBLOCK,
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0, CPM_CR_INIT_TRX) | CPM_CR_FLG;
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while (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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*/
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sp->gsmrl |= SCC_GSMRL_ENR | SCC_GSMRL_ENT;
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return (0);
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}
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static void mpc85xx_serial_setbrg(void)
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{
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#if defined(CONFIG_CONS_USE_EXTC)
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m8560_cpm_extcbrg(SCC_INDEX, gd->baudrate,
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CONFIG_CONS_EXTC_RATE, CONFIG_CONS_EXTC_PINSEL);
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#else
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m8560_cpm_setbrg(SCC_INDEX, gd->baudrate);
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#endif
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}
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static void mpc85xx_serial_putc(const char c)
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{
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volatile scc_uart_t *up;
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volatile cbd_t *tbdf;
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volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
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if (c == '\n')
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serial_putc ('\r');
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up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]);
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tbdf = (cbd_t *)&(cpm->im_dprambase[up->scc_genscc.scc_tbase]);
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/* Wait for last character to go.
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*/
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while (tbdf->cbd_sc & BD_SC_READY)
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;
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/* Load the character into the transmit buffer.
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*/
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*(volatile char *)tbdf->cbd_bufaddr = 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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static int mpc85xx_serial_getc(void)
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{
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volatile cbd_t *rbdf;
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volatile scc_uart_t *up;
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volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
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unsigned char c;
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up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]);
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rbdf = (cbd_t *)&(cpm->im_dprambase[up->scc_genscc.scc_rbase]);
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/* Wait for character to show up.
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*/
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while (rbdf->cbd_sc & BD_SC_EMPTY)
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;
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/* Grab the char and clear the buffer again.
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*/
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c = *(volatile unsigned char *)rbdf->cbd_bufaddr;
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rbdf->cbd_sc |= BD_SC_EMPTY;
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return (c);
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}
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static int mpc85xx_serial_tstc(void)
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{
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volatile cbd_t *rbdf;
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volatile scc_uart_t *up;
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volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
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up = (scc_uart_t *)&(cpm->im_dprambase[PROFF_SCC]);
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rbdf = (cbd_t *)&(cpm->im_dprambase[up->scc_genscc.scc_rbase]);
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return ((rbdf->cbd_sc & BD_SC_EMPTY) == 0);
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}
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static struct serial_device mpc85xx_serial_drv = {
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.name = "mpc85xx_serial",
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.start = mpc85xx_serial_init,
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.stop = NULL,
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.setbrg = mpc85xx_serial_setbrg,
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.putc = mpc85xx_serial_putc,
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.puts = default_serial_puts,
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.getc = mpc85xx_serial_getc,
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.tstc = mpc85xx_serial_tstc,
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};
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void mpc85xx_serial_initialize(void)
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{
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serial_register(&mpc85xx_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 &mpc85xx_serial_drv;
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}
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#endif /* CONFIG_CONS_ON_SCC */
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