/* * (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 */ /* Modified by Udi Finkelstein * * This file includes communication routines for SMC1 that can run even if * SMC2 have already been initialized. */ #include <common.h> #include <watchdog.h> #include <commproc.h> #include <devices.h> #include <lcd.h> DECLARE_GLOBAL_DATA_PTR; #define SMC_INDEX 0 #define PROFF_SMC PROFF_SMC1 #define CPM_CR_CH_SMC CPM_CR_CH_SMC1 #define RBC823_KBD_BAUDRATE 38400 #define CPM_KEYBOARD_BASE 0x1000 /* * Minimal serial functions needed to use one of the SMC ports * as serial console interface. */ void smc1_setbrg (void) { volatile immap_t *im = (immap_t *)CFG_IMMR; volatile cpm8xx_t *cp = &(im->im_cpm); /* Set up the baud rate generator. * See 8xx_io/commproc.c for details. * * Wire BRG2 to SMC1, BRG1 to SMC2 */ cp->cp_simode = 0x00001000; cp->cp_brgc2 = (((gd->cpu_clk / 16 / RBC823_KBD_BAUDRATE)-1) << 1) | CPM_BRG_EN; } int smc1_init (void) { volatile immap_t *im = (immap_t *)CFG_IMMR; volatile smc_t *sp; volatile smc_uart_t *up; volatile cbd_t *tbdf, *rbdf; volatile cpm8xx_t *cp = &(im->im_cpm); uint dpaddr; /* initialize pointers to SMC */ sp = (smc_t *) &(cp->cp_smc[SMC_INDEX]); up = (smc_uart_t *) &cp->cp_dparam[PROFF_SMC]; /* Disable transmitter/receiver. */ sp->smc_smcmr &= ~(SMCMR_REN | SMCMR_TEN); /* Enable SDMA. */ im->im_siu_conf.sc_sdcr = 1; /* clear error conditions */ #ifdef CFG_SDSR im->im_sdma.sdma_sdsr = CFG_SDSR; #else im->im_sdma.sdma_sdsr = 0x83; #endif /* clear SDMA interrupt mask */ #ifdef CFG_SDMR im->im_sdma.sdma_sdmr = CFG_SDMR; #else im->im_sdma.sdma_sdmr = 0x00; #endif /* Use Port B for SMC1 instead of other functions. */ cp->cp_pbpar |= 0x000000c0; cp->cp_pbdir &= ~0x000000c0; cp->cp_pbodr &= ~0x000000c0; /* Set the physical address of the host memory buffers in * the buffer descriptors. */ #ifdef CFG_ALLOC_DPRAM dpaddr = dpram_alloc_align (sizeof(cbd_t)*2 + 2, 8) ; #else dpaddr = CPM_KEYBOARD_BASE ; #endif /* Allocate space for two buffer descriptors in the DP ram. * For now, this address seems OK, but it may have to * change with newer versions of the firmware. * damm: allocating space after the two buffers for rx/tx data */ rbdf = (cbd_t *)&cp->cp_dpmem[dpaddr]; rbdf->cbd_bufaddr = (uint) (rbdf+2); rbdf->cbd_sc = 0; tbdf = rbdf + 1; tbdf->cbd_bufaddr = ((uint) (rbdf+2)) + 1; tbdf->cbd_sc = 0; /* Set up the uart parameters in the parameter ram. */ up->smc_rbase = dpaddr; up->smc_tbase = dpaddr+sizeof(cbd_t); up->smc_rfcr = SMC_EB; up->smc_tfcr = SMC_EB; /* Set UART mode, 8 bit, no parity, one stop. * Enable receive and transmit. */ sp->smc_smcmr = smcr_mk_clen(9) | SMCMR_SM_UART; /* Mask all interrupts and remove anything pending. */ sp->smc_smcm = 0; sp->smc_smce = 0xff; /* Set up the baud rate generator. */ smc1_setbrg (); /* Make the first buffer the only buffer. */ tbdf->cbd_sc |= BD_SC_WRAP; rbdf->cbd_sc |= BD_SC_EMPTY | BD_SC_WRAP; /* Single character receive. */ up->smc_mrblr = 1; up->smc_maxidl = 0; /* Initialize Tx/Rx parameters. */ while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */ ; cp->cp_cpcr = mk_cr_cmd(CPM_CR_CH_SMC, CPM_CR_INIT_TRX) | CPM_CR_FLG; while (cp->cp_cpcr & CPM_CR_FLG) /* wait if cp is busy */ ; /* Enable transmitter/receiver. */ sp->smc_smcmr |= SMCMR_REN | SMCMR_TEN; return (0); } void smc1_putc(const char c) { volatile cbd_t *tbdf; volatile char *buf; volatile smc_uart_t *up; volatile immap_t *im = (immap_t *)CFG_IMMR; volatile cpm8xx_t *cpmp = &(im->im_cpm); up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC]; tbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_tbase]; /* Wait for last character to go. */ buf = (char *)tbdf->cbd_bufaddr; *buf = c; tbdf->cbd_datlen = 1; tbdf->cbd_sc |= BD_SC_READY; __asm__("eieio"); while (tbdf->cbd_sc & BD_SC_READY) { WATCHDOG_RESET (); __asm__("eieio"); } } int smc1_getc(void) { volatile cbd_t *rbdf; volatile unsigned char *buf; volatile smc_uart_t *up; volatile immap_t *im = (immap_t *)CFG_IMMR; volatile cpm8xx_t *cpmp = &(im->im_cpm); unsigned char c; up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC]; rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase]; /* Wait for character to show up. */ buf = (unsigned char *)rbdf->cbd_bufaddr; while (rbdf->cbd_sc & BD_SC_EMPTY) WATCHDOG_RESET (); c = *buf; rbdf->cbd_sc |= BD_SC_EMPTY; return(c); } int smc1_tstc(void) { volatile cbd_t *rbdf; volatile smc_uart_t *up; volatile immap_t *im = (immap_t *)CFG_IMMR; volatile cpm8xx_t *cpmp = &(im->im_cpm); up = (smc_uart_t *)&cpmp->cp_dparam[PROFF_SMC]; rbdf = (cbd_t *)&cpmp->cp_dpmem[up->smc_rbase]; return(!(rbdf->cbd_sc & BD_SC_EMPTY)); } /* search for keyboard and register it if found */ int drv_keyboard_init(void) { int error = 0; device_t kbd_dev; if (0) { /* register the keyboard */ memset (&kbd_dev, 0, sizeof(device_t)); strcpy(kbd_dev.name, "kbd"); kbd_dev.flags = DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; kbd_dev.putc = NULL; kbd_dev.puts = NULL; kbd_dev.getc = smc1_getc; kbd_dev.tstc = smc1_tstc; error = device_register (&kbd_dev); } else { lcd_is_enabled = 0; lcd_disable(); } return error; }