+++ /dev/null
-/*
- * (C) Copyright 2011
- * eInfochips Ltd. <www.einfochips.com>
- * Written-by: Ajay Bhargav <ajay.bhargav@einfochips.com>
- *
- * (C) Copyright 2009
- * Marvell Semiconductor <www.marvell.com>
- * Based on SSP driver
- * Written-by: Lei Wen <leiwen@marvell.com>
- *
- * SPDX-License-Identifier: GPL-2.0+
- */
-
-
-#include <common.h>
-#include <malloc.h>
-#include <spi.h>
-
-#include <asm/io.h>
-#include <asm/arch/spi.h>
-#include <asm/gpio.h>
-
-#define to_armd_spi_slave(s) container_of(s, struct armd_spi_slave, slave)
-
-struct armd_spi_slave {
- struct spi_slave slave;
- struct ssp_reg *spi_reg;
- u32 cr0, cr1;
- u32 int_cr1;
- u32 clear_sr;
- const void *tx;
- void *rx;
- int gpio_cs_inverted;
-};
-
-static int spi_armd_write(struct armd_spi_slave *pss)
-{
- int wait_timeout = SSP_FLUSH_NUM;
- while (--wait_timeout && !(readl(&pss->spi_reg->sssr) & SSSR_TNF))
- ;
- if (!wait_timeout) {
- debug("%s: timeout error\n", __func__);
- return -1;
- }
-
- if (pss->tx != NULL) {
- writel(*(u8 *)pss->tx, &pss->spi_reg->ssdr);
- ++pss->tx;
- } else {
- writel(0, &pss->spi_reg->ssdr);
- }
- return 0;
-}
-
-static int spi_armd_read(struct armd_spi_slave *pss)
-{
- int wait_timeout = SSP_FLUSH_NUM;
- while (--wait_timeout && !(readl(&pss->spi_reg->sssr) & SSSR_RNE))
- ;
- if (!wait_timeout) {
- debug("%s: timeout error\n", __func__);
- return -1;
- }
-
- if (pss->rx != NULL) {
- *(u8 *)pss->rx = readl(&pss->spi_reg->ssdr);
- ++pss->rx;
- } else {
- readl(&pss->spi_reg->ssdr);
- }
- return 0;
-}
-
-static int spi_armd_flush(struct armd_spi_slave *pss)
-{
- unsigned long limit = SSP_FLUSH_NUM;
-
- do {
- while (readl(&pss->spi_reg->sssr) & SSSR_RNE)
- readl(&pss->spi_reg->ssdr);
- } while ((readl(&pss->spi_reg->sssr) & SSSR_BSY) && limit--);
-
- writel(SSSR_ROR, &pss->spi_reg->sssr);
-
- return limit;
-}
-
-void spi_cs_activate(struct spi_slave *slave)
-{
- struct armd_spi_slave *pss = to_armd_spi_slave(slave);
-
- gpio_set_value(slave->cs, pss->gpio_cs_inverted);
-}
-
-void spi_cs_deactivate(struct spi_slave *slave)
-{
- struct armd_spi_slave *pss = to_armd_spi_slave(slave);
-
- gpio_set_value(slave->cs, !pss->gpio_cs_inverted);
-}
-
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
- unsigned int max_hz, unsigned int mode)
-{
- struct armd_spi_slave *pss;
-
- pss = spi_alloc_slave(struct armd_spi_slave, bus, cs);
- if (!pss)
- return NULL;
-
- pss->spi_reg = (struct ssp_reg *)SSP_REG_BASE(CONFIG_SYS_SSP_PORT);
-
- pss->cr0 = SSCR0_MOTO | SSCR0_DATASIZE(DEFAULT_WORD_LEN) | SSCR0_SSE;
-
- pss->cr1 = (SSCR1_RXTRESH(RX_THRESH_DEF) & SSCR1_RFT) |
- (SSCR1_TXTRESH(TX_THRESH_DEF) & SSCR1_TFT);
- pss->cr1 &= ~(SSCR1_SPO | SSCR1_SPH);
- pss->cr1 |= (((mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0)
- | (((mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0);
-
- pss->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
- pss->clear_sr = SSSR_ROR | SSSR_TINT;
-
- pss->gpio_cs_inverted = mode & SPI_CS_HIGH;
- gpio_set_value(cs, !pss->gpio_cs_inverted);
-
- return &pss->slave;
-}
-
-void spi_free_slave(struct spi_slave *slave)
-{
- struct armd_spi_slave *pss = to_armd_spi_slave(slave);
-
- free(pss);
-}
-
-int spi_claim_bus(struct spi_slave *slave)
-{
- struct armd_spi_slave *pss = to_armd_spi_slave(slave);
-
- debug("%s: bus:%i cs:%i\n", __func__, slave->bus, slave->cs);
- if (spi_armd_flush(pss) == 0)
- return -1;
-
- 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 armd_spi_slave *pss = to_armd_spi_slave(slave);
- uint bytes = bitlen / 8;
- unsigned long limit;
- int ret = 0;
-
- if (bitlen == 0)
- goto done;
-
- /* we can only do 8 bit transfers */
- if (bitlen % 8) {
- flags |= SPI_XFER_END;
- goto done;
- }
-
- pss->tx = dout;
- pss->rx = din;
-
- if (flags & SPI_XFER_BEGIN) {
- spi_cs_activate(slave);
- writel(pss->cr1 | pss->int_cr1, &pss->spi_reg->sscr1);
- writel(TIMEOUT_DEF, &pss->spi_reg->ssto);
- writel(pss->cr0, &pss->spi_reg->sscr0);
- }
-
- while (bytes--) {
- limit = SSP_FLUSH_NUM;
- ret = spi_armd_write(pss);
- if (ret)
- break;
-
- while ((readl(&pss->spi_reg->sssr) & SSSR_BSY) && limit--)
- udelay(1);
-
- ret = spi_armd_read(pss);
- if (ret)
- break;
- }
-
- done:
- if (flags & SPI_XFER_END) {
- /* Stop SSP */
- writel(pss->clear_sr, &pss->spi_reg->sssr);
- clrbits_le32(&pss->spi_reg->sscr1, pss->int_cr1);
- writel(0, &pss->spi_reg->ssto);
- spi_cs_deactivate(slave);
- }
-
- return ret;
-}