/* * (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 */