diff options
Diffstat (limited to 'cpu/nios/spi.c')
| -rw-r--r-- | cpu/nios/spi.c | 195 |
1 files changed, 0 insertions, 195 deletions
diff --git a/cpu/nios/spi.c b/cpu/nios/spi.c deleted file mode 100644 index 89f9797..0000000 --- a/cpu/nios/spi.c +++ /dev/null @@ -1,195 +0,0 @@ -/* - * (C) Copyright 2004, Li-Pro.Net <www.li-pro.net> - * Stephan Linz <linz@li-pro.net> - * - * 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 - */ - -#include <common.h> -#include <linux/ctype.h> - -#if defined(CONFIG_NIOS_SPI) -#include <nios-io.h> -#include <spi.h> - -#if !defined(CONFIG_SYS_NIOS_SPIBASE) -#error "*** CONFIG_SYS_NIOS_SPIBASE not defined ***" -#endif - -#if !defined(CONFIG_SYS_NIOS_SPIBITS) -#error "*** CONFIG_SYS_NIOS_SPIBITS not defined ***" -#endif - -#if (CONFIG_SYS_NIOS_SPIBITS != 8) && (CONFIG_SYS_NIOS_SPIBITS != 16) -#error "*** CONFIG_SYS_NIOS_SPIBITS should be either 8 or 16 ***" -#endif - -static nios_spi_t *spi = (nios_spi_t *)CONFIG_SYS_NIOS_SPIBASE; - -/* Warning: - * You cannot enable DEBUG for early system initalization, i. e. when - * this driver is used to read environment parameters like "baudrate" - * from EEPROM which are used to initialize the serial port which is - * needed to print the debug messages... - */ -#undef DEBUG - -#ifdef DEBUG - -#define DPRINT(a) printf a; -/* ----------------------------------------------- - * Helper functions to peek into tx and rx buffers - * ----------------------------------------------- */ -static const char * const hex_digit = "0123456789ABCDEF"; - -static char quickhex (int i) -{ - return hex_digit[i]; -} - -static void memdump (const void *pv, int num) -{ - int i; - const unsigned char *pc = (const unsigned char *) pv; - - for (i = 0; i < num; i++) - printf ("%c%c ", quickhex (pc[i] >> 4), quickhex (pc[i] & 0x0f)); - printf ("\t"); - for (i = 0; i < num; i++) - printf ("%c", isprint (pc[i]) ? pc[i] : '.'); - printf ("\n"); -} -#else /* !DEBUG */ - -#define DPRINT(a) -#define memdump(p,n) - -#endif /* DEBUG */ - - -struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, - unsigned int max_hz, unsigned int mode) -{ - struct spi_slave *slave; - - if (!spi_cs_is_valid(bus, cs)) - return NULL; - - slave = malloc(sizeof(struct spi_slave)); - if (!slave) - return NULL; - - slave->bus = bus; - slave->cs = cs; - - /* TODO: Add support for different modes and speeds */ - - return slave; -} - -void spi_free_slave(struct spi_slave *slave) -{ - free(slave); -} - -int spi_claim_bus(struct spi_slave *slave) -{ - return 0; -} - -void spi_release_bus(struct spi_slave *slave) -{ - -} - -/* - * SPI transfer: - * - * See include/spi.h and http://www.altera.com/literature/ds/ds_nios_spi.pdf - * for more informations. - */ -int spi_xfer(struct spi_slave *slave, int bitlen, const void *dout, - void *din, unsigned long flags) -{ - const u8 *txd = dout; - u8 *rxd = din; - int j; - - DPRINT(("spi_xfer: slave %u:%u dout %08X din %08X bitlen %d\n", - slave->bus, slave->cs, *(uint *)dout, *(uint *)din, bitlen)); - - memdump(dout, (bitlen + 7) / 8); - - if (flags & SPI_XFER_BEGIN) - spi_cs_activate(slave); - - if (!(flags & SPI_XFER_END) || bitlen > CONFIG_SYS_NIOS_SPIBITS) { - /* leave chip select active */ - spi->control |= NIOS_SPI_SSO; - } - - for ( j = 0; /* count each byte in */ - j < ((bitlen + 7) / 8); /* dout[] and din[] */ - -#if (CONFIG_SYS_NIOS_SPIBITS == 8) - j++) { - - while ((spi->status & NIOS_SPI_TRDY) == 0) - ; - spi->txdata = (unsigned)(txd[j]); - - while ((spi->status & NIOS_SPI_RRDY) == 0) - ; - rxd[j] = (unsigned char)(spi->rxdata & 0xff); - -#elif (CONFIG_SYS_NIOS_SPIBITS == 16) - j++, j++) { - - while ((spi->status & NIOS_SPI_TRDY) == 0) - ; - if ((j+1) < ((bitlen + 7) / 8)) - spi->txdata = (unsigned)((txd[j] << 8) | txd[j+1]); - else - spi->txdata = (unsigned)(txd[j] << 8); - - while ((spi->status & NIOS_SPI_RRDY) == 0) - ; - rxd[j] = (unsigned char)((spi->rxdata >> 8) & 0xff); - if ((j+1) < ((bitlen + 7) / 8)) - rxd[j+1] = (unsigned char)(spi->rxdata & 0xff); - -#else -#error "*** unsupported value of CONFIG_SYS_NIOS_SPIBITS ***" -#endif - - } - - if (bitlen > CONFIG_SYS_NIOS_SPIBITS && (flags & SPI_XFER_END)) { - spi->control &= ~NIOS_SPI_SSO; - } - - if (flags & SPI_XFER_END) - spi_cs_deactivate(slave); - - memdump(din, (bitlen + 7) / 8); - - return 0; -} - -#endif /* CONFIG_NIOS_SPI */ |