+++ /dev/null
-/*
- * (C) Copyright 2010
- * Michael Kurz <michi.kurz@googlemail.com>
- *
- * 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 <malloc.h>
-#include <spi.h>
-
-#include <asm/addrspace.h>
-#include <asm/types.h>
-#include <asm/ar71xx.h>
-
-/*-----------------------------------------------------------------------
- * Definitions
- */
-
-#ifdef DEBUG_SPI
-#define PRINTD(fmt,args...) printf (fmt ,##args)
-#else
-#define PRINTD(fmt,args...)
-#endif
-
-struct ar71xx_spi_slave {
- struct spi_slave slave;
- unsigned int mode;
-};
-
-static inline struct ar71xx_spi_slave *to_ar71xx_spi(struct spi_slave *slave)
-{
- return container_of(slave, struct ar71xx_spi_slave, slave);
-}
-
-/*=====================================================================*/
-/* Public Functions */
-/*=====================================================================*/
-
-/*-----------------------------------------------------------------------
- * Initialization
- */
-
-void spi_init()
-{
- PRINTD("ar71xx_spi: spi_init");
-
- // Init SPI Hardware, disable remap, set clock
- __raw_writel(0x43, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_CTRL));
-
- PRINTD(" ---> out\n");
-}
-
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
- unsigned int max_hz, unsigned int mode)
-{
- struct ar71xx_spi_slave *ss;
-
- PRINTD("ar71xx_spi: spi_setup_slave");
-
- if ((bus != 0) || (cs > 2))
- return NULL;
-
- ss = malloc(sizeof(struct ar71xx_spi_slave));
- if (!ss)
- return NULL;
-
- ss->slave.bus = bus;
- ss->slave.cs = cs;
- ss->mode = mode;
-
- /* TODO: Use max_hz to limit the SCK rate */
-
- PRINTD(" ---> out\n");
-
- return &ss->slave;
-}
-
-void spi_free_slave(struct spi_slave *slave)
-{
- struct ar71xx_spi_slave *ss = to_ar71xx_spi(slave);
-
- free(ss);
-}
-
-int spi_claim_bus(struct spi_slave *slave)
-{
-
- return 0;
-}
-
-void spi_release_bus(struct spi_slave *slave)
-{
-
-}
-
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
- void *din, unsigned long flags)
-{
- struct ar71xx_spi_slave *ss = to_ar71xx_spi(slave);
- uint8_t *rx = din;
- const uint8_t *tx = dout;
- uint8_t curbyte, curbitlen, restbits;
- uint32_t bytes = bitlen / 8;
- uint32_t out;
- uint32_t in;
-
- PRINTD("ar71xx_spi: spi_xfer: slave:%p bitlen:%08x dout:%p din:%p flags:%08x\n", slave, bitlen, dout, din, flags);
-
- if (flags & SPI_XFER_BEGIN) {
- __raw_writel(SPI_FS_GPIO, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_FS));
- __raw_writel(SPI_IOC_CS_ALL, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC));
- }
-
- restbits = (bitlen % 8);
- if (restbits != 0)
- bytes++;
-
- // enable chip select
- out = SPI_IOC_CS_ALL & ~(SPI_IOC_CS(slave->cs));
-
- while (bytes--) {
-
- curbyte = 0;
- if (tx) {
- curbyte = *tx++;
- }
-
- if (restbits != 0) {
- curbitlen = restbits;
- curbyte <<= 8 - restbits;
- } else {
- curbitlen = 8;
- }
-
- PRINTD("ar71xx_spi: sending: data:%02x length:%d\n", curbyte, curbitlen);
-
- /* clock starts at inactive polarity */
- for (curbyte <<= (8 - curbitlen); curbitlen; curbitlen--) {
-
- if (curbyte & (1 << 7))
- out |= SPI_IOC_DO;
- else
- out &= ~(SPI_IOC_DO);
-
- /* setup MSB (to slave) on trailing edge */
- __raw_writel(out, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC));
-
- __raw_writel(out | SPI_IOC_CLK, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC));
-
- curbyte <<= 1;
- }
-
- in = __raw_readl(KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_RDS));
- PRINTD("ar71xx_spi: received:%02x\n", in);
-
- if (rx) {
- if (restbits == 0) {
- *rx++ = in;
- } else {
- *rx++ = (in << (8 - restbits));
- }
- }
- }
-
- if (flags & SPI_XFER_END) {
- __raw_writel(SPI_IOC_CS(slave->cs), KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC));
- __raw_writel(SPI_IOC_CS_ALL, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_IOC));
- __raw_writel(0, KSEG1ADDR(AR71XX_SPI_BASE + SPI_REG_FS));
- }
-
- PRINTD(" ---> out\n");
-
- return 0;
-}
projects / openwrt / staging / chunkeey.git / blobdiff