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https://github.com/AsahiLinux/u-boot
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spi: omap3: Convert to driver model
After this conversion the driver will able to support both dm and non-dm and code is more extensible like we can remove the non-dm part simply without touching anycode if all the boards which are using this driver become dm driven. Cc: Tom Rini <trini@konsulko.com> Reviewed-by: Simon Glass <sjg@chromium.org> Acked-by: Christophe Ricard <christophe-h.ricard@st.com> Tested-by: Christophe Ricard <christophe-h.ricard@st.com> Signed-off-by: Jagan Teki <jteki@openedev.com> [Set priv->wordlen, Add Kconfig entry and file credit for dm conversion] Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
This commit is contained in:
Jagan Teki
parent
03661d85f0
commit
77b8d04854
2 changed files with 511 additions and 365 deletions
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@ -155,6 +155,13 @@ config ZYNQ_QSPI
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Zynq QSPI IP core. This IP is used to connect the flash in
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4-bit qspi, 8-bit dual stacked and shared 4-bit dual parallel.
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config OMAP3_SPI
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bool "McSPI driver for OMAP"
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help
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SPI master controller for OMAP24XX and later Multichannel SPI
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(McSPI). This driver be used to access SPI chips on platforms
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embedding this OMAP3 McSPI IP core.
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endif # if DM_SPI
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config FSL_ESPI
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@ -1,4 +1,7 @@
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/*
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* Copyright (C) 2016 Jagan Teki <jteki@openedev.com>
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* Christophe Ricard <christophe.ricard@gmail.com>
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*
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* Copyright (C) 2010 Dirk Behme <dirk.behme@googlemail.com>
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*
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* Driver for McSPI controller on OMAP3. Based on davinci_spi.c
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@ -15,10 +18,13 @@
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*/
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#include <common.h>
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#include <dm.h>
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#include <spi.h>
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#include <malloc.h>
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#include <asm/io.h>
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DECLARE_GLOBAL_DATA_PTR;
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#if defined(CONFIG_AM33XX) || defined(CONFIG_AM43XX)
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#define OMAP3_MCSPI1_BASE 0x48030100
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#define OMAP3_MCSPI2_BASE 0x481A0100
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@ -65,6 +71,8 @@
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#define OMAP3_MCSPI_CHCTRL_DIS (0 << 0)
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#define OMAP3_MCSPI_WAKEUPENABLE_WKEN BIT(0)
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#define MCSPI_PINDIR_D0_IN_D1_OUT 0
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#define MCSPI_PINDIR_D0_OUT_D1_IN 1
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#define OMAP3_MCSPI_MAX_FREQ 48000000
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#define SPI_WAIT_TIMEOUT 10
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@ -94,54 +102,398 @@ struct mcspi {
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/* channel3: 0x68 - 0x78, bus 0 */
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};
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struct omap3_spi_slave {
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struct spi_slave slave;
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struct omap3_spi_priv {
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struct mcspi *regs;
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unsigned int cs;
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unsigned int freq;
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unsigned int mode;
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unsigned int wordlen;
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unsigned int pin_dir:1;
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};
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static void omap3_spi_write_chconf(struct omap3_spi_priv *priv, int val)
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{
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writel(val, &priv->regs->channel[priv->cs].chconf);
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/* Flash post writes to make immediate effect */
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readl(&priv->regs->channel[priv->cs].chconf);
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}
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static void omap3_spi_set_enable(struct omap3_spi_priv *priv, int enable)
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{
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writel(enable, &priv->regs->channel[priv->cs].chctrl);
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/* Flash post writes to make immediate effect */
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readl(&priv->regs->channel[priv->cs].chctrl);
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}
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static int omap3_spi_write(struct omap3_spi_priv *priv, unsigned int len,
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const void *txp, unsigned long flags)
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{
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ulong start;
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int i, chconf;
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chconf = readl(&priv->regs->channel[priv->cs].chconf);
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/* Enable the channel */
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omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
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chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
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chconf |= (priv->wordlen - 1) << 7;
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chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY;
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chconf |= OMAP3_MCSPI_CHCONF_FORCE;
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omap3_spi_write_chconf(priv, chconf);
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for (i = 0; i < len; i++) {
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/* wait till TX register is empty (TXS == 1) */
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start = get_timer(0);
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while (!(readl(&priv->regs->channel[priv->cs].chstat) &
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OMAP3_MCSPI_CHSTAT_TXS)) {
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if (get_timer(start) > SPI_WAIT_TIMEOUT) {
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printf("SPI TXS timed out, status=0x%08x\n",
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readl(&priv->regs->channel[priv->cs].chstat));
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return -1;
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}
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}
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/* Write the data */
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unsigned int *tx = &priv->regs->channel[priv->cs].tx;
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if (priv->wordlen > 16)
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writel(((u32 *)txp)[i], tx);
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else if (priv->wordlen > 8)
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writel(((u16 *)txp)[i], tx);
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else
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writel(((u8 *)txp)[i], tx);
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}
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/* wait to finish of transfer */
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while ((readl(&priv->regs->channel[priv->cs].chstat) &
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(OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)) !=
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(OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS))
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;
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/* Disable the channel otherwise the next immediate RX will get affected */
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omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
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if (flags & SPI_XFER_END) {
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chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
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omap3_spi_write_chconf(priv, chconf);
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}
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return 0;
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}
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static int omap3_spi_read(struct omap3_spi_priv *priv, unsigned int len,
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void *rxp, unsigned long flags)
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{
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int i, chconf;
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ulong start;
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chconf = readl(&priv->regs->channel[priv->cs].chconf);
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/* Enable the channel */
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omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
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chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
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chconf |= (priv->wordlen - 1) << 7;
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chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY;
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chconf |= OMAP3_MCSPI_CHCONF_FORCE;
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omap3_spi_write_chconf(priv, chconf);
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writel(0, &priv->regs->channel[priv->cs].tx);
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for (i = 0; i < len; i++) {
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start = get_timer(0);
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/* Wait till RX register contains data (RXS == 1) */
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while (!(readl(&priv->regs->channel[priv->cs].chstat) &
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OMAP3_MCSPI_CHSTAT_RXS)) {
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if (get_timer(start) > SPI_WAIT_TIMEOUT) {
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printf("SPI RXS timed out, status=0x%08x\n",
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readl(&priv->regs->channel[priv->cs].chstat));
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return -1;
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}
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}
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/* Disable the channel to prevent furher receiving */
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if (i == (len - 1))
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omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
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/* Read the data */
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unsigned int *rx = &priv->regs->channel[priv->cs].rx;
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if (priv->wordlen > 16)
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((u32 *)rxp)[i] = readl(rx);
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else if (priv->wordlen > 8)
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((u16 *)rxp)[i] = (u16)readl(rx);
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else
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((u8 *)rxp)[i] = (u8)readl(rx);
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}
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if (flags & SPI_XFER_END) {
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chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
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omap3_spi_write_chconf(priv, chconf);
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}
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return 0;
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}
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/*McSPI Transmit Receive Mode*/
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static int omap3_spi_txrx(struct omap3_spi_priv *priv, unsigned int len,
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const void *txp, void *rxp, unsigned long flags)
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{
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ulong start;
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int chconf, i = 0;
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chconf = readl(&priv->regs->channel[priv->cs].chconf);
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/*Enable SPI channel*/
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omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
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/*set TRANSMIT-RECEIVE Mode*/
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chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
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chconf |= (priv->wordlen - 1) << 7;
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chconf |= OMAP3_MCSPI_CHCONF_FORCE;
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omap3_spi_write_chconf(priv, chconf);
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/*Shift in and out 1 byte at time*/
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for (i=0; i < len; i++){
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/* Write: wait for TX empty (TXS == 1)*/
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start = get_timer(0);
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while (!(readl(&priv->regs->channel[priv->cs].chstat) &
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OMAP3_MCSPI_CHSTAT_TXS)) {
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if (get_timer(start) > SPI_WAIT_TIMEOUT) {
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printf("SPI TXS timed out, status=0x%08x\n",
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readl(&priv->regs->channel[priv->cs].chstat));
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return -1;
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}
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}
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/* Write the data */
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unsigned int *tx = &priv->regs->channel[priv->cs].tx;
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if (priv->wordlen > 16)
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writel(((u32 *)txp)[i], tx);
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else if (priv->wordlen > 8)
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writel(((u16 *)txp)[i], tx);
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else
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writel(((u8 *)txp)[i], tx);
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/*Read: wait for RX containing data (RXS == 1)*/
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start = get_timer(0);
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while (!(readl(&priv->regs->channel[priv->cs].chstat) &
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OMAP3_MCSPI_CHSTAT_RXS)) {
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if (get_timer(start) > SPI_WAIT_TIMEOUT) {
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printf("SPI RXS timed out, status=0x%08x\n",
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readl(&priv->regs->channel[priv->cs].chstat));
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return -1;
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}
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}
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/* Read the data */
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unsigned int *rx = &priv->regs->channel[priv->cs].rx;
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if (priv->wordlen > 16)
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((u32 *)rxp)[i] = readl(rx);
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else if (priv->wordlen > 8)
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((u16 *)rxp)[i] = (u16)readl(rx);
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else
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((u8 *)rxp)[i] = (u8)readl(rx);
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}
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/* Disable the channel */
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omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
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/*if transfer must be terminated disable the channel*/
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if (flags & SPI_XFER_END) {
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chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
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omap3_spi_write_chconf(priv, chconf);
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}
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return 0;
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}
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static int _spi_xfer(struct omap3_spi_priv *priv, unsigned int bitlen,
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const void *dout, void *din, unsigned long flags)
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{
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unsigned int len;
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int ret = -1;
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if (priv->wordlen < 4 || priv->wordlen > 32) {
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printf("omap3_spi: invalid wordlen %d\n", priv->wordlen);
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return -1;
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}
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if (bitlen % priv->wordlen)
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return -1;
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len = bitlen / priv->wordlen;
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if (bitlen == 0) { /* only change CS */
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int chconf = readl(&priv->regs->channel[priv->cs].chconf);
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if (flags & SPI_XFER_BEGIN) {
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omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
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chconf |= OMAP3_MCSPI_CHCONF_FORCE;
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omap3_spi_write_chconf(priv, chconf);
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}
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if (flags & SPI_XFER_END) {
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chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
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omap3_spi_write_chconf(priv, chconf);
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omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
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}
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ret = 0;
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} else {
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if (dout != NULL && din != NULL)
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ret = omap3_spi_txrx(priv, len, dout, din, flags);
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else if (dout != NULL)
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ret = omap3_spi_write(priv, len, dout, flags);
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else if (din != NULL)
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ret = omap3_spi_read(priv, len, din, flags);
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}
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return ret;
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}
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static void _omap3_spi_set_speed(struct omap3_spi_priv *priv)
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{
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uint32_t confr, div = 0;
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confr = readl(&priv->regs->channel[priv->cs].chconf);
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/* Calculate clock divisor. Valid range: 0x0 - 0xC ( /1 - /4096 ) */
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if (priv->freq) {
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while (div <= 0xC && (OMAP3_MCSPI_MAX_FREQ / (1 << div))
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> priv->freq)
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div++;
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} else {
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div = 0xC;
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}
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/* set clock divisor */
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confr &= ~OMAP3_MCSPI_CHCONF_CLKD_MASK;
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confr |= div << 2;
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omap3_spi_write_chconf(priv, confr);
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}
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static void _omap3_spi_set_mode(struct omap3_spi_priv *priv)
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{
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uint32_t confr;
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confr = readl(&priv->regs->channel[priv->cs].chconf);
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/* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
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* REVISIT: this controller could support SPI_3WIRE mode.
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*/
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if (priv->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) {
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confr &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
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confr |= OMAP3_MCSPI_CHCONF_DPE0;
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} else {
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confr &= ~OMAP3_MCSPI_CHCONF_DPE0;
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confr |= OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1;
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}
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/* set SPI mode 0..3 */
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confr &= ~(OMAP3_MCSPI_CHCONF_POL | OMAP3_MCSPI_CHCONF_PHA);
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if (priv->mode & SPI_CPHA)
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confr |= OMAP3_MCSPI_CHCONF_PHA;
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if (priv->mode & SPI_CPOL)
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confr |= OMAP3_MCSPI_CHCONF_POL;
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/* set chipselect polarity; manage with FORCE */
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if (!(priv->mode & SPI_CS_HIGH))
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confr |= OMAP3_MCSPI_CHCONF_EPOL; /* active-low; normal */
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else
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confr &= ~OMAP3_MCSPI_CHCONF_EPOL;
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/* Transmit & receive mode */
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confr &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
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omap3_spi_write_chconf(priv, confr);
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}
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static void _omap3_spi_set_wordlen(struct omap3_spi_priv *priv)
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{
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unsigned int confr;
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/* McSPI individual channel configuration */
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confr = readl(&priv->regs->channel[priv->wordlen].chconf);
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/* wordlength */
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confr &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
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confr |= (priv->wordlen - 1) << 7;
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omap3_spi_write_chconf(priv, confr);
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}
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static void spi_reset(struct mcspi *regs)
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{
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unsigned int tmp;
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writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, ®s->sysconfig);
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do {
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tmp = readl(®s->sysstatus);
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} while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
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writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
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OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
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OMAP3_MCSPI_SYSCONFIG_SMARTIDLE, ®s->sysconfig);
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writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, ®s->wakeupenable);
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}
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static void _omap3_spi_claim_bus(struct omap3_spi_priv *priv)
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{
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unsigned int conf;
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spi_reset(priv->regs);
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/*
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* setup when switching from (reset default) slave mode
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* to single-channel master mode
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*/
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conf = readl(&priv->regs->modulctrl);
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conf &= ~(OMAP3_MCSPI_MODULCTRL_STEST | OMAP3_MCSPI_MODULCTRL_MS);
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conf |= OMAP3_MCSPI_MODULCTRL_SINGLE;
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writel(conf, &priv->regs->modulctrl);
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_omap3_spi_set_mode(priv);
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_omap3_spi_set_speed(priv);
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}
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#ifndef CONFIG_DM_SPI
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struct omap3_spi_slave {
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struct spi_slave slave;
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struct omap3_spi_priv spi_priv;
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};
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struct omap3_spi_priv *priv;
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static inline struct omap3_spi_slave *to_omap3_spi(struct spi_slave *slave)
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{
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return container_of(slave, struct omap3_spi_slave, slave);
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}
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static void spi_reset(struct omap3_spi_slave *ds)
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{
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unsigned int tmp;
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writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &ds->regs->sysconfig);
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do {
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tmp = readl(&ds->regs->sysstatus);
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} while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
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writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
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OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
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OMAP3_MCSPI_SYSCONFIG_SMARTIDLE,
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&ds->regs->sysconfig);
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|
||||
writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &ds->regs->wakeupenable);
|
||||
}
|
||||
|
||||
static void omap3_spi_write_chconf(struct omap3_spi_slave *ds, int val)
|
||||
{
|
||||
writel(val, &ds->regs->channel[ds->slave.cs].chconf);
|
||||
/* Flash post writes to make immediate effect */
|
||||
readl(&ds->regs->channel[ds->slave.cs].chconf);
|
||||
}
|
||||
|
||||
static void omap3_spi_set_enable(struct omap3_spi_slave *ds, int enable)
|
||||
{
|
||||
writel(enable, &ds->regs->channel[ds->slave.cs].chctrl);
|
||||
/* Flash post writes to make immediate effect */
|
||||
readl(&ds->regs->channel[ds->slave.cs].chctrl);
|
||||
}
|
||||
|
||||
void spi_init()
|
||||
void spi_init(void)
|
||||
{
|
||||
/* do nothing */
|
||||
}
|
||||
|
||||
void spi_free_slave(struct spi_slave *slave)
|
||||
{
|
||||
struct omap3_spi_slave *ds = to_omap3_spi(slave);
|
||||
|
||||
free(ds);
|
||||
}
|
||||
|
||||
int spi_claim_bus(struct spi_slave *slave)
|
||||
{
|
||||
_omap3_spi_claim_bus(priv);
|
||||
_omap3_spi_set_wordlen(priv);
|
||||
_omap3_spi_set_mode(priv);
|
||||
_omap3_spi_set_speed(priv);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void spi_release_bus(struct spi_slave *slave)
|
||||
{
|
||||
/* Reset the SPI hardware */
|
||||
spi_reset(priv->regs);
|
||||
}
|
||||
|
||||
struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
|
||||
unsigned int max_hz, unsigned int mode)
|
||||
{
|
||||
|
|
@ -177,8 +529,7 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
|
|||
break;
|
||||
#endif
|
||||
default:
|
||||
printf("SPI error: unsupported bus %i. \
|
||||
Supported busses 0 - 3\n", bus);
|
||||
printf("SPI error: unsupported bus %i. Supported busses 0 - 3\n", bus);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
|
@ -186,14 +537,12 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
|
|||
((bus == 1) && (cs > 1)) ||
|
||||
((bus == 2) && (cs > 1)) ||
|
||||
((bus == 3) && (cs > 0))) {
|
||||
printf("SPI error: unsupported chip select %i \
|
||||
on bus %i\n", cs, bus);
|
||||
printf("SPI error: unsupported chip select %i on bus %i\n", cs, bus);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
|
||||
printf("SPI error: unsupported frequency %i Hz. \
|
||||
Max frequency is 48 Mhz\n", max_hz);
|
||||
printf("SPI error: unsupported frequency %i Hz. Max frequency is 48 Mhz\n", max_hz);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
|
|
@ -208,332 +557,122 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
|
|||
return NULL;
|
||||
}
|
||||
|
||||
ds->regs = regs;
|
||||
ds->freq = max_hz;
|
||||
ds->mode = mode;
|
||||
priv = &ds->spi_priv;
|
||||
|
||||
priv->regs = regs;
|
||||
priv->cs = cs;
|
||||
priv->freq = max_hz;
|
||||
priv->mode = mode;
|
||||
priv->wordlen = ds->slave.wordlen;
|
||||
#ifdef CONFIG_OMAP3_SPI_D0_D1_SWAPPED
|
||||
priv->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN;
|
||||
#endif
|
||||
|
||||
return &ds->slave;
|
||||
}
|
||||
|
||||
void spi_free_slave(struct spi_slave *slave)
|
||||
{
|
||||
struct omap3_spi_slave *ds = to_omap3_spi(slave);
|
||||
|
||||
free(ds);
|
||||
}
|
||||
|
||||
int spi_claim_bus(struct spi_slave *slave)
|
||||
{
|
||||
struct omap3_spi_slave *ds = to_omap3_spi(slave);
|
||||
unsigned int conf, div = 0;
|
||||
|
||||
/* McSPI global module configuration */
|
||||
|
||||
/*
|
||||
* setup when switching from (reset default) slave mode
|
||||
* to single-channel master mode
|
||||
*/
|
||||
spi_reset(ds);
|
||||
conf = readl(&ds->regs->modulctrl);
|
||||
conf &= ~(OMAP3_MCSPI_MODULCTRL_STEST | OMAP3_MCSPI_MODULCTRL_MS);
|
||||
conf |= OMAP3_MCSPI_MODULCTRL_SINGLE;
|
||||
writel(conf, &ds->regs->modulctrl);
|
||||
|
||||
/* McSPI individual channel configuration */
|
||||
|
||||
/* Calculate clock divisor. Valid range: 0x0 - 0xC ( /1 - /4096 ) */
|
||||
if (ds->freq) {
|
||||
while (div <= 0xC && (OMAP3_MCSPI_MAX_FREQ / (1 << div))
|
||||
> ds->freq)
|
||||
div++;
|
||||
} else
|
||||
div = 0xC;
|
||||
|
||||
conf = readl(&ds->regs->channel[ds->slave.cs].chconf);
|
||||
|
||||
/* standard 4-wire master mode: SCK, MOSI/out, MISO/in, nCS
|
||||
* REVISIT: this controller could support SPI_3WIRE mode.
|
||||
*/
|
||||
#ifdef CONFIG_OMAP3_SPI_D0_D1_SWAPPED
|
||||
/*
|
||||
* Some boards have D0 wired as MOSI / D1 as MISO instead of
|
||||
* The normal D0 as MISO / D1 as MOSI.
|
||||
*/
|
||||
conf &= ~OMAP3_MCSPI_CHCONF_DPE0;
|
||||
conf |= OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1;
|
||||
#else
|
||||
conf &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
|
||||
conf |= OMAP3_MCSPI_CHCONF_DPE0;
|
||||
#endif
|
||||
|
||||
/* wordlength */
|
||||
conf &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
|
||||
conf |= (ds->slave.wordlen - 1) << 7;
|
||||
|
||||
/* set chipselect polarity; manage with FORCE */
|
||||
if (!(ds->mode & SPI_CS_HIGH))
|
||||
conf |= OMAP3_MCSPI_CHCONF_EPOL; /* active-low; normal */
|
||||
else
|
||||
conf &= ~OMAP3_MCSPI_CHCONF_EPOL;
|
||||
|
||||
/* set clock divisor */
|
||||
conf &= ~OMAP3_MCSPI_CHCONF_CLKD_MASK;
|
||||
conf |= div << 2;
|
||||
|
||||
/* set SPI mode 0..3 */
|
||||
if (ds->mode & SPI_CPOL)
|
||||
conf |= OMAP3_MCSPI_CHCONF_POL;
|
||||
else
|
||||
conf &= ~OMAP3_MCSPI_CHCONF_POL;
|
||||
if (ds->mode & SPI_CPHA)
|
||||
conf |= OMAP3_MCSPI_CHCONF_PHA;
|
||||
else
|
||||
conf &= ~OMAP3_MCSPI_CHCONF_PHA;
|
||||
|
||||
/* Transmit & receive mode */
|
||||
conf &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
|
||||
|
||||
omap3_spi_write_chconf(ds,conf);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void spi_release_bus(struct spi_slave *slave)
|
||||
{
|
||||
struct omap3_spi_slave *ds = to_omap3_spi(slave);
|
||||
|
||||
/* Reset the SPI hardware */
|
||||
spi_reset(ds);
|
||||
}
|
||||
|
||||
static int omap3_spi_write(struct spi_slave *slave, unsigned int len,
|
||||
const void *txp, unsigned long flags)
|
||||
{
|
||||
struct omap3_spi_slave *ds = to_omap3_spi(slave);
|
||||
int i;
|
||||
ulong start;
|
||||
int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
|
||||
|
||||
/* Enable the channel */
|
||||
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
|
||||
|
||||
chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
|
||||
chconf |= (ds->slave.wordlen - 1) << 7;
|
||||
chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY;
|
||||
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
|
||||
omap3_spi_write_chconf(ds,chconf);
|
||||
|
||||
for (i = 0; i < len; i++) {
|
||||
/* wait till TX register is empty (TXS == 1) */
|
||||
start = get_timer(0);
|
||||
while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
|
||||
OMAP3_MCSPI_CHSTAT_TXS)) {
|
||||
if (get_timer(start) > SPI_WAIT_TIMEOUT) {
|
||||
printf("SPI TXS timed out, status=0x%08x\n",
|
||||
readl(&ds->regs->channel[ds->slave.cs].chstat));
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
/* Write the data */
|
||||
unsigned int *tx = &ds->regs->channel[ds->slave.cs].tx;
|
||||
if (ds->slave.wordlen > 16)
|
||||
writel(((u32 *)txp)[i], tx);
|
||||
else if (ds->slave.wordlen > 8)
|
||||
writel(((u16 *)txp)[i], tx);
|
||||
else
|
||||
writel(((u8 *)txp)[i], tx);
|
||||
}
|
||||
|
||||
/* wait to finish of transfer */
|
||||
while ((readl(&ds->regs->channel[ds->slave.cs].chstat) &
|
||||
(OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)) !=
|
||||
(OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS));
|
||||
|
||||
/* Disable the channel otherwise the next immediate RX will get affected */
|
||||
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
|
||||
|
||||
if (flags & SPI_XFER_END) {
|
||||
|
||||
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
|
||||
omap3_spi_write_chconf(ds,chconf);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int omap3_spi_read(struct spi_slave *slave, unsigned int len,
|
||||
void *rxp, unsigned long flags)
|
||||
{
|
||||
struct omap3_spi_slave *ds = to_omap3_spi(slave);
|
||||
int i;
|
||||
ulong start;
|
||||
int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
|
||||
|
||||
/* Enable the channel */
|
||||
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
|
||||
|
||||
chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
|
||||
chconf |= (ds->slave.wordlen - 1) << 7;
|
||||
chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY;
|
||||
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
|
||||
omap3_spi_write_chconf(ds,chconf);
|
||||
|
||||
writel(0, &ds->regs->channel[ds->slave.cs].tx);
|
||||
|
||||
for (i = 0; i < len; i++) {
|
||||
start = get_timer(0);
|
||||
/* Wait till RX register contains data (RXS == 1) */
|
||||
while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
|
||||
OMAP3_MCSPI_CHSTAT_RXS)) {
|
||||
if (get_timer(start) > SPI_WAIT_TIMEOUT) {
|
||||
printf("SPI RXS timed out, status=0x%08x\n",
|
||||
readl(&ds->regs->channel[ds->slave.cs].chstat));
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/* Disable the channel to prevent furher receiving */
|
||||
if(i == (len - 1))
|
||||
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
|
||||
|
||||
/* Read the data */
|
||||
unsigned int *rx = &ds->regs->channel[ds->slave.cs].rx;
|
||||
if (ds->slave.wordlen > 16)
|
||||
((u32 *)rxp)[i] = readl(rx);
|
||||
else if (ds->slave.wordlen > 8)
|
||||
((u16 *)rxp)[i] = (u16)readl(rx);
|
||||
else
|
||||
((u8 *)rxp)[i] = (u8)readl(rx);
|
||||
}
|
||||
|
||||
if (flags & SPI_XFER_END) {
|
||||
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
|
||||
omap3_spi_write_chconf(ds,chconf);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*McSPI Transmit Receive Mode*/
|
||||
static int omap3_spi_txrx(struct spi_slave *slave, unsigned int len,
|
||||
const void *txp, void *rxp, unsigned long flags)
|
||||
{
|
||||
struct omap3_spi_slave *ds = to_omap3_spi(slave);
|
||||
ulong start;
|
||||
int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
|
||||
int i=0;
|
||||
|
||||
/*Enable SPI channel*/
|
||||
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
|
||||
|
||||
/*set TRANSMIT-RECEIVE Mode*/
|
||||
chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
|
||||
chconf |= (ds->slave.wordlen - 1) << 7;
|
||||
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
|
||||
omap3_spi_write_chconf(ds,chconf);
|
||||
|
||||
/*Shift in and out 1 byte at time*/
|
||||
for (i=0; i < len; i++){
|
||||
/* Write: wait for TX empty (TXS == 1)*/
|
||||
start = get_timer(0);
|
||||
while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
|
||||
OMAP3_MCSPI_CHSTAT_TXS)) {
|
||||
if (get_timer(start) > SPI_WAIT_TIMEOUT) {
|
||||
printf("SPI TXS timed out, status=0x%08x\n",
|
||||
readl(&ds->regs->channel[ds->slave.cs].chstat));
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
/* Write the data */
|
||||
unsigned int *tx = &ds->regs->channel[ds->slave.cs].tx;
|
||||
if (ds->slave.wordlen > 16)
|
||||
writel(((u32 *)txp)[i], tx);
|
||||
else if (ds->slave.wordlen > 8)
|
||||
writel(((u16 *)txp)[i], tx);
|
||||
else
|
||||
writel(((u8 *)txp)[i], tx);
|
||||
|
||||
/*Read: wait for RX containing data (RXS == 1)*/
|
||||
start = get_timer(0);
|
||||
while (!(readl(&ds->regs->channel[ds->slave.cs].chstat) &
|
||||
OMAP3_MCSPI_CHSTAT_RXS)) {
|
||||
if (get_timer(start) > SPI_WAIT_TIMEOUT) {
|
||||
printf("SPI RXS timed out, status=0x%08x\n",
|
||||
readl(&ds->regs->channel[ds->slave.cs].chstat));
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
/* Read the data */
|
||||
unsigned int *rx = &ds->regs->channel[ds->slave.cs].rx;
|
||||
if (ds->slave.wordlen > 16)
|
||||
((u32 *)rxp)[i] = readl(rx);
|
||||
else if (ds->slave.wordlen > 8)
|
||||
((u16 *)rxp)[i] = (u16)readl(rx);
|
||||
else
|
||||
((u8 *)rxp)[i] = (u8)readl(rx);
|
||||
}
|
||||
/* Disable the channel */
|
||||
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
|
||||
|
||||
/*if transfer must be terminated disable the channel*/
|
||||
if (flags & SPI_XFER_END) {
|
||||
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
|
||||
omap3_spi_write_chconf(ds,chconf);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
|
||||
const void *dout, void *din, unsigned long flags)
|
||||
{ return _spi_xfer(priv, bitlen, dout, din, flags); }
|
||||
|
||||
#else
|
||||
|
||||
static int omap3_spi_claim_bus(struct udevice *dev)
|
||||
{
|
||||
struct omap3_spi_slave *ds = to_omap3_spi(slave);
|
||||
unsigned int len;
|
||||
int ret = -1;
|
||||
struct udevice *bus = dev->parent;
|
||||
struct omap3_spi_priv *priv = dev_get_priv(bus);
|
||||
struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
|
||||
|
||||
if (ds->slave.wordlen < 4 || ds->slave.wordlen > 32) {
|
||||
printf("omap3_spi: invalid wordlen %d\n", ds->slave.wordlen);
|
||||
return -1;
|
||||
priv->cs = slave_plat->cs;
|
||||
priv->mode = slave_plat->mode;
|
||||
priv->freq = slave_plat->max_hz;
|
||||
_omap3_spi_claim_bus(priv);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (bitlen % ds->slave.wordlen)
|
||||
return -1;
|
||||
|
||||
len = bitlen / ds->slave.wordlen;
|
||||
|
||||
if (bitlen == 0) { /* only change CS */
|
||||
int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
|
||||
|
||||
if (flags & SPI_XFER_BEGIN) {
|
||||
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
|
||||
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
|
||||
omap3_spi_write_chconf(ds,chconf);
|
||||
}
|
||||
if (flags & SPI_XFER_END) {
|
||||
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
|
||||
omap3_spi_write_chconf(ds,chconf);
|
||||
omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
|
||||
}
|
||||
ret = 0;
|
||||
} else {
|
||||
if (dout != NULL && din != NULL)
|
||||
ret = omap3_spi_txrx(slave, len, dout, din, flags);
|
||||
else if (dout != NULL)
|
||||
ret = omap3_spi_write(slave, len, dout, flags);
|
||||
else if (din != NULL)
|
||||
ret = omap3_spi_read(slave, len, din, flags);
|
||||
}
|
||||
return ret;
|
||||
}
|
||||
|
||||
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
|
||||
static int omap3_spi_release_bus(struct udevice *dev)
|
||||
{
|
||||
return 1;
|
||||
struct udevice *bus = dev->parent;
|
||||
struct omap3_spi_priv *priv = dev_get_priv(bus);
|
||||
|
||||
/* Reset the SPI hardware */
|
||||
spi_reset(priv->regs);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void spi_cs_activate(struct spi_slave *slave)
|
||||
static int omap3_spi_set_wordlen(struct udevice *dev, unsigned int wordlen)
|
||||
{
|
||||
struct udevice *bus = dev->parent;
|
||||
struct omap3_spi_priv *priv = dev_get_priv(bus);
|
||||
struct dm_spi_slave_platdata *slave_plat = dev_get_parent_platdata(dev);
|
||||
|
||||
priv->cs = slave_plat->cs;
|
||||
priv->wordlen = wordlen;
|
||||
_omap3_spi_set_wordlen(priv);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void spi_cs_deactivate(struct spi_slave *slave)
|
||||
static int omap3_spi_probe(struct udevice *dev)
|
||||
{
|
||||
struct omap3_spi_priv *priv = dev_get_priv(dev);
|
||||
const void *blob = gd->fdt_blob;
|
||||
int node = dev->of_offset;
|
||||
|
||||
priv->regs = (struct mcspi *)dev_get_addr(dev);
|
||||
priv->pin_dir = fdtdec_get_uint(blob, node, "ti,pindir-d0-out-d1-in",
|
||||
MCSPI_PINDIR_D0_IN_D1_OUT);
|
||||
priv->wordlen = SPI_DEFAULT_WORDLEN;
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int omap3_spi_xfer(struct udevice *dev, unsigned int bitlen,
|
||||
const void *dout, void *din, unsigned long flags)
|
||||
{
|
||||
struct udevice *bus = dev->parent;
|
||||
struct omap3_spi_priv *priv = dev_get_priv(bus);
|
||||
|
||||
return _spi_xfer(priv, bitlen, dout, din, flags);
|
||||
}
|
||||
|
||||
static int omap3_spi_set_speed(struct udevice *bus, unsigned int speed)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int omap3_spi_set_mode(struct udevice *bus, uint mode)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct dm_spi_ops omap3_spi_ops = {
|
||||
.claim_bus = omap3_spi_claim_bus,
|
||||
.release_bus = omap3_spi_release_bus,
|
||||
.set_wordlen = omap3_spi_set_wordlen,
|
||||
.xfer = omap3_spi_xfer,
|
||||
.set_speed = omap3_spi_set_speed,
|
||||
.set_mode = omap3_spi_set_mode,
|
||||
/*
|
||||
* cs_info is not needed, since we require all chip selects to be
|
||||
* in the device tree explicitly
|
||||
*/
|
||||
};
|
||||
|
||||
static const struct udevice_id omap3_spi_ids[] = {
|
||||
{ .compatible = "ti,omap2-mcspi" },
|
||||
{ .compatible = "ti,omap4-mcspi" },
|
||||
{ }
|
||||
};
|
||||
|
||||
U_BOOT_DRIVER(omap3_spi) = {
|
||||
.name = "omap3_spi",
|
||||
.id = UCLASS_SPI,
|
||||
.of_match = omap3_spi_ids,
|
||||
.probe = omap3_spi_probe,
|
||||
.ops = &omap3_spi_ops,
|
||||
.priv_auto_alloc_size = sizeof(struct omap3_spi_priv),
|
||||
.probe = omap3_spi_probe,
|
||||
};
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in a new issue