[U-Boot] [PATCH 3/3] spi: omap3: Convert to driver model
Christophe Henri RICARD
christophe-h.ricard at st.com
Sun Feb 14 20:59:56 CET 2016
Hi Jagan,
Acked-by: Christophe Ricard <christophe-h.ricard at st.com>
Best Regards
Christophe
-----Original Message-----
From: Jagan Teki [mailto:jteki at openedev.com]
Sent: jeudi 11 février 2016 20:01
To: u-boot at lists.denx.de
Cc: Jagan Teki; Tom Rini; Simon Glass; Christophe Henri RICARD
Subject: [PATCH 3/3] 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 at konsulko.com>
Cc: Simon Glass <sjg at chromium.org>
Cc: Christophe Ricard <christophe-h.ricard at st.com>
Signed-off-by: Jagan Teki <jteki at openedev.com>
---
drivers/spi/omap3_spi.c | 678 +++++++++++++++++++++++++++++-------------------
1 file changed, 407 insertions(+), 271 deletions(-)
diff --git a/drivers/spi/omap3_spi.c b/drivers/spi/omap3_spi.c index 8b0f665..5770848 100644
--- a/drivers/spi/omap3_spi.c
+++ b/drivers/spi/omap3_spi.c
@@ -1,4 +1,6 @@
/*
+ * Copyright (C) 2016 Jagan Teki <jteki at openedev.com>
+ *
* Copyright (C) 2010 Dirk Behme <dirk.behme at googlemail.com>
*
* Driver for McSPI controller on OMAP3. Based on davinci_spi.c @@ -15,6 +17,7 @@
*/
#include <common.h>
+#include <dm.h>
#include <spi.h>
#include <malloc.h>
#include <asm/io.h>
@@ -93,312 +96,122 @@ struct mcspi {
/* channel3: 0x68 - 0x78, bus 0 */ };
-struct omap3_spi_slave {
- struct spi_slave slave;
+struct omap3_spi_priv {
struct mcspi *regs;
+ unsigned int cs;
unsigned int freq;
unsigned int mode;
+ unsigned int wordlen;
};
-static inline struct omap3_spi_slave *to_omap3_spi(struct spi_slave *slave) -{
- return container_of(slave, struct omap3_spi_slave, slave);
-}
-
-static void spi_reset(struct omap3_spi_slave *ds) -{
- unsigned int tmp;
-
- writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, &ds->regs->sysconfig);
- do {
- tmp = readl(&ds->regs->sysstatus);
- } while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
-
- writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
- OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
- OMAP3_MCSPI_SYSCONFIG_SMARTIDLE,
- &ds->regs->sysconfig);
-
- writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, &ds->regs->wakeupenable);
-}
-
-static void omap3_spi_write_chconf(struct omap3_spi_slave *ds, int val)
+static void omap3_spi_write_chconf(struct omap3_spi_priv *priv, int
+val)
{
- writel(val, &ds->regs->channel[ds->slave.cs].chconf);
+ writel(val, &priv->regs->channel[priv->cs].chconf);
/* Flash post writes to make immediate effect */
- readl(&ds->regs->channel[ds->slave.cs].chconf);
+ readl(&priv->regs->channel[priv->cs].chconf);
}
-static void omap3_spi_set_enable(struct omap3_spi_slave *ds, int enable)
+static void omap3_spi_set_enable(struct omap3_spi_priv *priv, int
+enable)
{
- writel(enable, &ds->regs->channel[ds->slave.cs].chctrl);
+ writel(enable, &priv->regs->channel[priv->cs].chctrl);
/* Flash post writes to make immediate effect */
- readl(&ds->regs->channel[ds->slave.cs].chctrl);
-}
-
-void spi_init()
-{
- /* do nothing */
-}
-
-struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
- unsigned int max_hz, unsigned int mode)
-{
- struct omap3_spi_slave *ds;
- struct mcspi *regs;
-
- /*
- * OMAP3 McSPI (MultiChannel SPI) has 4 busses (modules)
- * with different number of chip selects (CS, channels):
- * McSPI1 has 4 CS (bus 0, cs 0 - 3)
- * McSPI2 has 2 CS (bus 1, cs 0 - 1)
- * McSPI3 has 2 CS (bus 2, cs 0 - 1)
- * McSPI4 has 1 CS (bus 3, cs 0)
- */
-
- switch (bus) {
- case 0:
- regs = (struct mcspi *)OMAP3_MCSPI1_BASE;
- break;
-#ifdef OMAP3_MCSPI2_BASE
- case 1:
- regs = (struct mcspi *)OMAP3_MCSPI2_BASE;
- break;
-#endif
-#ifdef OMAP3_MCSPI3_BASE
- case 2:
- regs = (struct mcspi *)OMAP3_MCSPI3_BASE;
- break;
-#endif
-#ifdef OMAP3_MCSPI4_BASE
- case 3:
- regs = (struct mcspi *)OMAP3_MCSPI4_BASE;
- break;
-#endif
- default:
- printf("SPI error: unsupported bus %i. \
- Supported busses 0 - 3\n", bus);
- return NULL;
- }
-
- if (((bus == 0) && (cs > 3)) ||
- ((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);
- return NULL;
- }
-
- if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
- printf("SPI error: unsupported frequency %i Hz. \
- Max frequency is 48 Mhz\n", max_hz);
- return NULL;
- }
-
- if (mode > SPI_MODE_3) {
- printf("SPI error: unsupported SPI mode %i\n", mode);
- return NULL;
- }
-
- ds = spi_alloc_slave(struct omap3_spi_slave, bus, cs);
- if (!ds) {
- printf("SPI error: malloc of SPI structure failed\n");
- return NULL;
- }
-
- ds->regs = regs;
- ds->freq = max_hz;
- ds->mode = mode;
-
- 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);
+ readl(&priv->regs->channel[priv->cs].chctrl);
}
-static int omap3_spi_write(struct spi_slave *slave, unsigned int len,
+static int omap3_spi_write(struct omap3_spi_priv *priv, 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);
+ int chconf, i;
+
+ chconf = readl(&priv->regs->channel[priv->cs].chconf);
/* Enable the channel */
- omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
+ omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
- chconf |= (ds->slave.wordlen - 1) << 7;
+ chconf |= (priv->wordlen - 1) << 7;
chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY;
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
- omap3_spi_write_chconf(ds,chconf);
+ omap3_spi_write_chconf(priv, 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) &
+ while (!(readl(&priv->regs->channel[priv->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));
+ readl(&priv->regs->channel[priv->cs].chstat));
return -1;
}
}
/* Write the data */
- unsigned int *tx = &ds->regs->channel[ds->slave.cs].tx;
- if (ds->slave.wordlen > 16)
+ unsigned int *tx = &priv->regs->channel[priv->cs].tx;
+ if (priv->wordlen > 16)
writel(((u32 *)txp)[i], tx);
- else if (ds->slave.wordlen > 8)
+ else if (priv->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) &
+ while ((readl(&priv->regs->channel[priv->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);
+ omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
if (flags & SPI_XFER_END) {
-
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
- omap3_spi_write_chconf(ds,chconf);
+ omap3_spi_write_chconf(priv, chconf);
}
+
return 0;
}
-static int omap3_spi_read(struct spi_slave *slave, unsigned int len,
+static int omap3_spi_read(struct omap3_spi_priv *priv, 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);
+ int chconf, i;
+
+ chconf = readl(&priv->regs->channel[priv->cs].chconf);
/* Enable the channel */
- omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
+ omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK);
- chconf |= (ds->slave.wordlen - 1) << 7;
+ chconf |= (priv->wordlen - 1) << 7;
chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY;
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
- omap3_spi_write_chconf(ds,chconf);
+ omap3_spi_write_chconf(priv, chconf);
- writel(0, &ds->regs->channel[ds->slave.cs].tx);
+ writel(0, &priv->regs->channel[priv->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) &
+ while (!(readl(&priv->regs->channel[priv->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));
+ readl(&priv->regs->channel[priv->cs].chstat));
return -1;
}
}
/* Disable the channel to prevent furher receiving */
- if(i == (len - 1))
- omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_DIS);
+ if (i == (len - 1))
+ omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
/* Read the data */
- unsigned int *rx = &ds->regs->channel[ds->slave.cs].rx;
- if (ds->slave.wordlen > 16)
+ unsigned int *rx = &priv->regs->channel[priv->cs].rx;
+ if (priv->wordlen > 16)
((u32 *)rxp)[i] = readl(rx);
- else if (ds->slave.wordlen > 8)
+ else if (priv->wordlen > 8)
((u16 *)rxp)[i] = (u16)readl(rx);
else
((u8 *)rxp)[i] = (u8)readl(rx);
@@ -406,133 +219,456 @@ static int omap3_spi_read(struct spi_slave *slave, unsigned int len,
if (flags & SPI_XFER_END) {
chconf &= ~OMAP3_MCSPI_CHCONF_FORCE;
- omap3_spi_write_chconf(ds,chconf);
+ omap3_spi_write_chconf(priv, chconf);
}
return 0;
}
/*McSPI Transmit Receive Mode*/
-static int omap3_spi_txrx(struct spi_slave *slave, unsigned int len,
+static int omap3_spi_txrx(struct omap3_spi_priv *priv, 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;
+ int chconf, i = 0;
+
+ chconf = readl(&priv->regs->channel[priv->cs].chconf);
/*Enable SPI channel*/
- omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
+ omap3_spi_set_enable(priv, 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 |= (priv->wordlen - 1) << 7;
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
- omap3_spi_write_chconf(ds,chconf);
+ omap3_spi_write_chconf(priv, chconf);
/*Shift in and out 1 byte at time*/
- for (i=0; i < len; i++){
+ 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) &
+ while (!(readl(&priv->regs->channel[priv->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));
+ readl(&priv->regs->channel[priv->cs].chstat));
return -1;
}
}
/* Write the data */
- unsigned int *tx = &ds->regs->channel[ds->slave.cs].tx;
- if (ds->slave.wordlen > 16)
+ unsigned int *tx = &priv->regs->channel[priv->cs].tx;
+ if (priv->wordlen > 16)
writel(((u32 *)txp)[i], tx);
- else if (ds->slave.wordlen > 8)
+ else if (priv->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) &
+ while (!(readl(&priv->regs->channel[priv->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));
+ readl(&priv->regs->channel[priv->cs].chstat));
return -1;
}
}
/* Read the data */
- unsigned int *rx = &ds->regs->channel[ds->slave.cs].rx;
- if (ds->slave.wordlen > 16)
+ unsigned int *rx = &priv->regs->channel[priv->cs].rx;
+ if (priv->wordlen > 16)
((u32 *)rxp)[i] = readl(rx);
- else if (ds->slave.wordlen > 8)
+ else if (priv->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);
+ omap3_spi_set_enable(priv, 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);
+ omap3_spi_write_chconf(priv, chconf);
}
return 0;
}
-int spi_xfer(struct spi_slave *slave, unsigned int bitlen,
- const void *dout, void *din, unsigned long flags)
+static int _spi_xfer(struct omap3_spi_priv *priv, unsigned int bitlen,
+ const void *dout, void *din, unsigned long flags)
{
- struct omap3_spi_slave *ds = to_omap3_spi(slave);
- unsigned int len;
+ unsigned int len;
int ret = -1;
- if (ds->slave.wordlen < 4 || ds->slave.wordlen > 32) {
- printf("omap3_spi: invalid wordlen %d\n", ds->slave.wordlen);
+ if (priv->wordlen < 4 || priv->wordlen > 32) {
+ printf("omap3_spi: invalid wordlen %d\n", priv->wordlen);
return -1;
}
- if (bitlen % ds->slave.wordlen)
+ if (bitlen % priv->wordlen)
return -1;
- len = bitlen / ds->slave.wordlen;
+ len = bitlen / priv->wordlen;
if (bitlen == 0) { /* only change CS */
- int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf);
+ int chconf = readl(&priv->regs->channel[priv->cs].chconf);
if (flags & SPI_XFER_BEGIN) {
- omap3_spi_set_enable(ds,OMAP3_MCSPI_CHCTRL_EN);
+ omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN);
chconf |= OMAP3_MCSPI_CHCONF_FORCE;
- omap3_spi_write_chconf(ds,chconf);
+ omap3_spi_write_chconf(priv, 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);
+ omap3_spi_write_chconf(priv, chconf);
+ omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS);
}
ret = 0;
} else {
if (dout != NULL && din != NULL)
- ret = omap3_spi_txrx(slave, len, dout, din, flags);
+ ret = omap3_spi_txrx(priv, len, dout, din, flags);
else if (dout != NULL)
- ret = omap3_spi_write(slave, len, dout, flags);
+ ret = omap3_spi_write(priv, len, dout, flags);
else if (din != NULL)
- ret = omap3_spi_read(slave, len, din, flags);
+ ret = omap3_spi_read(priv, len, din, flags);
}
return ret;
}
-int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+static void _omap3_spi_set_speed(struct omap3_spi_priv *priv) {
+ uint32_t confr, div = 0;
+
+ confr = readl(&priv->regs->channel[priv->cs].chconf);
+
+ /* Calculate clock divisor. Valid range: 0x0 - 0xC ( /1 - /4096 ) */
+ if (priv->freq) {
+ while (div <= 0xC && (OMAP3_MCSPI_MAX_FREQ / (1 << div))
+ > priv->freq)
+ div++;
+ } else {
+ div = 0xC;
+ }
+
+ /* set clock divisor */
+ confr &= ~OMAP3_MCSPI_CHCONF_CLKD_MASK;
+ confr |= div << 2;
+
+ omap3_spi_write_chconf(priv, confr);
+}
+
+static void _omap3_spi_set_mode(struct omap3_spi_priv *priv) {
+ uint32_t confr;
+
+ confr = readl(&priv->regs->channel[priv->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.
+ */
+ confr &= ~OMAP3_MCSPI_CHCONF_DPE0;
+ confr |= OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1;
+#else
+ confr &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1);
+ confr |= OMAP3_MCSPI_CHCONF_DPE0;
+#endif
+
+ /* set SPI mode 0..3 */
+ confr &= ~(OMAP3_MCSPI_CHCONF_POL | OMAP3_MCSPI_CHCONF_PHA);
+ if (priv->mode & SPI_CPHA)
+ confr |= OMAP3_MCSPI_CHCONF_PHA;
+ if (priv->mode & SPI_CPOL)
+ confr |= OMAP3_MCSPI_CHCONF_POL;
+
+ /* set chipselect polarity; manage with FORCE */
+ if (!(priv->mode & SPI_CS_HIGH))
+ confr |= OMAP3_MCSPI_CHCONF_EPOL; /* active-low; normal */
+ else
+ confr &= ~OMAP3_MCSPI_CHCONF_EPOL;
+
+ /* Transmit & receive mode */
+ confr &= ~OMAP3_MCSPI_CHCONF_TRM_MASK;
+
+ omap3_spi_write_chconf(priv, confr);
+}
+
+static void _omap3_spi_set_wordlen(struct omap3_spi_priv *priv) {
+ unsigned int confr;
+
+ /* McSPI individual channel configuration */
+ confr = readl(&priv->regs->channel[priv->wordlen].chconf);
+
+ /* wordlength */
+ confr &= ~OMAP3_MCSPI_CHCONF_WL_MASK;
+ confr |= (priv->wordlen - 1) << 7;
+
+ omap3_spi_write_chconf(priv, confr);
+}
+
+static void spi_reset(struct mcspi *regs) {
+ unsigned int tmp;
+
+ writel(OMAP3_MCSPI_SYSCONFIG_SOFTRESET, ®s->sysconfig);
+ do {
+ tmp = readl(®s->sysstatus);
+ } while (!(tmp & OMAP3_MCSPI_SYSSTATUS_RESETDONE));
+
+ writel(OMAP3_MCSPI_SYSCONFIG_AUTOIDLE |
+ OMAP3_MCSPI_SYSCONFIG_ENAWAKEUP |
+ OMAP3_MCSPI_SYSCONFIG_SMARTIDLE,
+ ®s->sysconfig);
+
+ writel(OMAP3_MCSPI_WAKEUPENABLE_WKEN, ®s->wakeupenable); }
+
+static void _omap3_spi_claim_bus(struct omap3_spi_priv *priv) {
+ unsigned int conf;
+
+ spi_reset(priv->regs);
+
+ /*
+ * setup when switching from (reset default) slave mode
+ * to single-channel master mode
+ */
+ conf = readl(&priv->regs->modulctrl);
+ conf &= ~(OMAP3_MCSPI_MODULCTRL_STEST | OMAP3_MCSPI_MODULCTRL_MS);
+ conf |= OMAP3_MCSPI_MODULCTRL_SINGLE;
+
+ writel(conf, &priv->regs->modulctrl);
+
+ _omap3_spi_set_mode(priv);
+ _omap3_spi_set_speed(priv);
+}
+
+#ifndef CONFIG_DM_SPI
+
+struct omap3_spi_slave {
+ struct spi_slave slave;
+ struct omap3_spi_priv spi_priv;
+};
+
+struct omap3_spi_priv *priv;
+
+static inline struct omap3_spi_slave *to_omap3_spi(struct spi_slave
+*slave) {
+ return container_of(slave, struct omap3_spi_slave, slave); }
+
+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) {
+ struct omap3_spi_slave *ds;
+ struct mcspi *regs;
+
+ /*
+ * OMAP3 McSPI (MultiChannel SPI) has 4 busses (modules)
+ * with different number of chip selects (CS, channels):
+ * McSPI1 has 4 CS (bus 0, cs 0 - 3)
+ * McSPI2 has 2 CS (bus 1, cs 0 - 1)
+ * McSPI3 has 2 CS (bus 2, cs 0 - 1)
+ * McSPI4 has 1 CS (bus 3, cs 0)
+ */
+
+ switch (bus) {
+ case 0:
+ regs = (struct mcspi *)OMAP3_MCSPI1_BASE;
+ break;
+#ifdef OMAP3_MCSPI2_BASE
+ case 1:
+ regs = (struct mcspi *)OMAP3_MCSPI2_BASE;
+ break;
+#endif
+#ifdef OMAP3_MCSPI3_BASE
+ case 2:
+ regs = (struct mcspi *)OMAP3_MCSPI3_BASE;
+ break;
+#endif
+#ifdef OMAP3_MCSPI4_BASE
+ case 3:
+ regs = (struct mcspi *)OMAP3_MCSPI4_BASE;
+ break;
+#endif
+ default:
+ printf("SPI error: unsupported bus %i. \
+ Supported busses 0 - 3\n", bus);
+ return NULL;
+ }
+
+ if (((bus == 0) && (cs > 3)) ||
+ ((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);
+ return NULL;
+ }
+
+ if (max_hz > OMAP3_MCSPI_MAX_FREQ) {
+ printf("SPI error: unsupported frequency %i Hz. \
+ Max frequency is 48 Mhz\n", max_hz);
+ return NULL;
+ }
+
+ if (mode > SPI_MODE_3) {
+ printf("SPI error: unsupported SPI mode %i\n", mode);
+ return NULL;
+ }
+
+ ds = spi_alloc_slave(struct omap3_spi_slave, bus, cs);
+ if (!ds) {
+ printf("SPI error: malloc of SPI structure failed\n");
+ return NULL;
+ }
+
+ priv = &ds->spi_priv;
+
+ priv->regs = regs;
+ priv->cs = cs;
+ priv->freq = max_hz;
+ priv->mode = mode;
+ priv->wordlen = ds->slave.wordlen;
+
+ return &ds->slave;
+}
+
+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)
{
- return 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);
+
+ priv->cs = slave_plat->cs;
+ priv->mode = slave_plat->mode;
+ priv->freq = slave_plat->max_hz;
+ _omap3_spi_claim_bus(priv);
+
+ return 0;
}
-void spi_cs_activate(struct spi_slave *slave)
+static int omap3_spi_release_bus(struct udevice *dev)
{
+ 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_deactivate(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;
}
+
+static int omap3_spi_probe(struct udevice *dev) {
+ struct udevice *bus = dev->parent;
+ struct omap3_spi_priv *priv = dev_get_priv(bus);
+
+ priv->regs = (struct mcspi *)dev_get_addr(bus);
+
+ 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
--
1.9.1
More information about the U-Boot
mailing list