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![Haavard Skinnemoen](/assets/img/avatar_default.png)
This patch gets rid of the spi_chipsel table and adds a handful of new functions that makes the SPI layer cleaner and more flexible. Instead of the spi_chipsel table, each board that wants to use SPI gets to implement three hooks: * spi_cs_activate(): Activates the chipselect for a given slave * spi_cs_deactivate(): Deactivates the chipselect for a given slave * spi_cs_is_valid(): Determines if the given bus/chipselect combination can be activated. Not all drivers may need those extra functions however. If that's the case, the board code may just leave them out (assuming they know what the driver needs) or rely on the linker to strip them out (assuming --gc-sections is being used.) To set up communication parameters for a given slave, the driver needs to call spi_setup_slave(). This returns a pointer to an opaque spi_slave struct which must be passed as a parameter to subsequent SPI calls. This struct can be freed by calling spi_free_slave(), but most driver probably don't want to do this. Before starting one or more SPI transfers, the driver must call spi_claim_bus() to gain exclusive access to the SPI bus and initialize the hardware. When all transfers are done, the driver must call spi_release_bus() to make the bus available to others, and possibly shut down the SPI controller hardware. spi_xfer() behaves mostly the same as before, but it now takes a spi_slave parameter instead of a spi_chipsel function pointer. It also got a new parameter, flags, which is used to specify chip select behaviour. This may be extended with other flags in the future. This patch has been build-tested on all powerpc and arm boards involved. I have not tested NIOS since I don't have a toolchain for it installed, so I expect some breakage there even though I've tried fixing up everything I could find by visual inspection. I have run-time tested this on AVR32 ATNGW100 using the atmel_spi and DataFlash drivers posted as a follow-up. I'd like some help testing other boards that use the existing SPI API. But most of all, I'd like some comments on the new API. Is this stuff usable for everyone? If not, why? Changed in v4: - Build fixes for various boards, drivers and commands - Provide common struct spi_slave definition that can be extended by drivers - Pass a struct spi_slave * to spi_cs_activate and spi_cs_deactivate - Make default bus and mode build-time configurable - Override default SPI bus ID and mode on mx32ads and imx31_litekit. Changed in v3: - Add opaque struct spi_slave for controller-specific data associated with a slave. - Add spi_claim_bus() and spi_release_bus() - Add spi_free_slave() - spi_setup() is now called spi_setup_slave() and returns a struct spi_slave - soft_spi now supports four SPI modes (CPOL|CPHA) - Add bus parameter to spi_setup_slave() - Convert the new i.MX32 SPI driver - Convert the new MC13783 RTC driver Changed in v2: - Convert the mpc8xxx_spi driver and the mpc8349emds board to the new API. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Tested-by: Guennadi Liakhovetski <lg@denx.de>
196 lines
4.5 KiB
C
196 lines
4.5 KiB
C
/*
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* (C) Copyright 2004, Li-Pro.Net <www.li-pro.net>
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* Stephan Linz <linz@li-pro.net>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <linux/ctype.h>
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#if defined(CONFIG_NIOS_SPI)
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#include <nios-io.h>
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#include <spi.h>
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#if !defined(CFG_NIOS_SPIBASE)
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#error "*** CFG_NIOS_SPIBASE not defined ***"
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#endif
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#if !defined(CFG_NIOS_SPIBITS)
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#error "*** CFG_NIOS_SPIBITS not defined ***"
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#endif
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#if (CFG_NIOS_SPIBITS != 8) && (CFG_NIOS_SPIBITS != 16)
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#error "*** CFG_NIOS_SPIBITS should be either 8 or 16 ***"
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#endif
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static nios_spi_t *spi = (nios_spi_t *)CFG_NIOS_SPIBASE;
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/* Warning:
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* You cannot enable DEBUG for early system initalization, i. e. when
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* this driver is used to read environment parameters like "baudrate"
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* from EEPROM which are used to initialize the serial port which is
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* needed to print the debug messages...
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*/
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#undef DEBUG
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#ifdef DEBUG
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#define DPRINT(a) printf a;
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/* -----------------------------------------------
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* Helper functions to peek into tx and rx buffers
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* ----------------------------------------------- */
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static const char * const hex_digit = "0123456789ABCDEF";
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static char quickhex (int i)
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{
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return hex_digit[i];
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}
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static void memdump (const void *pv, int num)
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{
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int i;
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const unsigned char *pc = (const unsigned char *) pv;
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for (i = 0; i < num; i++)
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printf ("%c%c ", quickhex (pc[i] >> 4), quickhex (pc[i] & 0x0f));
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printf ("\t");
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for (i = 0; i < num; i++)
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printf ("%c", isprint (pc[i]) ? pc[i] : '.');
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printf ("\n");
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}
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#else /* !DEBUG */
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#define DPRINT(a)
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#define memdump(p,n)
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#endif /* DEBUG */
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struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
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unsigned int max_hz, unsigned int mode)
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{
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struct spi_slave *slave;
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if (!spi_cs_is_valid(bus, cs))
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return NULL;
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slave = malloc(sizeof(struct spi_slave));
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if (!slave)
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return NULL;
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slave->bus = bus;
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slave->cs = cs;
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/* TODO: Add support for different modes and speeds */
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return slave;
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}
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void spi_free_slave(struct spi_slave *slave)
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{
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free(slave);
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}
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int spi_claim_bus(struct spi_slave *slave)
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{
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return 0;
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}
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void spi_release_bus(struct spi_slave *slave)
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{
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}
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/*
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* SPI transfer:
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*
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* See include/spi.h and http://www.altera.com/literature/ds/ds_nios_spi.pdf
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* for more informations.
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*/
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int spi_xfer(struct spi_slave *slave, int bitlen, const void *dout,
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void *din, unsigned long flags)
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{
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const u8 *txd = dout;
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u8 *rxd = din;
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int j;
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DPRINT(("spi_xfer: slave %u:%u dout %08X din %08X bitlen %d\n",
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slave->bus, slave->cs, *(uint *)dout, *(uint *)din, bitlen));
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memdump(dout, (bitlen + 7) / 8);
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if (flags & SPI_XFER_BEGIN)
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spi_cs_activate(slave);
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if (!(flags & SPI_XFER_END) || bitlen > CFG_NIOS_SPIBITS) {
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/* leave chip select active */
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spi->control |= NIOS_SPI_SSO;
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}
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for ( j = 0; /* count each byte in */
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j < ((bitlen + 7) / 8); /* dout[] and din[] */
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#if (CFG_NIOS_SPIBITS == 8)
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j++) {
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while ((spi->status & NIOS_SPI_TRDY) == 0)
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;
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spi->txdata = (unsigned)(txd[j]);
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while ((spi->status & NIOS_SPI_RRDY) == 0)
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;
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rxd[j] = (unsigned char)(spi->rxdata & 0xff);
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#elif (CFG_NIOS_SPIBITS == 16)
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j++, j++) {
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while ((spi->status & NIOS_SPI_TRDY) == 0)
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;
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if ((j+1) < ((bitlen + 7) / 8))
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spi->txdata = (unsigned)((txd[j] << 8) | txd[j+1]);
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else
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spi->txdata = (unsigned)(txd[j] << 8);
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while ((spi->status & NIOS_SPI_RRDY) == 0)
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;
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rxd[j] = (unsigned char)((spi->rxdata >> 8) & 0xff);
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if ((j+1) < ((bitlen + 7) / 8))
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rxd[j+1] = (unsigned char)(spi->rxdata & 0xff);
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#else
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#error "*** unsupported value of CFG_NIOS_SPIBITS ***"
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#endif
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}
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if (bitlen > CFG_NIOS_SPIBITS && (flags & SPI_XFER_END)) {
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spi->control &= ~NIOS_SPI_SSO;
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}
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if (flags & SPI_XFER_END)
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spi_cs_deactivate(slave);
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memdump(din, (bitlen + 7) / 8);
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return 0;
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}
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#endif /* CONFIG_NIOS_SPI */
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