diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/spi/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/spi/omap3_spi.c | 679 |
2 files changed, 416 insertions, 270 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 2cdb11025f..f0258f84af 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -155,6 +155,13 @@ config ZYNQ_QSPI Zynq QSPI IP core. This IP is used to connect the flash in 4-bit qspi, 8-bit dual stacked and shared 4-bit dual parallel. +config OMAP3_SPI + bool "McSPI driver for OMAP" + help + SPI master controller for OMAP24XX and later Multichannel SPI + (McSPI). This driver be used to access SPI chips on platforms + embedding this OMAP3 McSPI IP core. + endif # if DM_SPI config FSL_ESPI diff --git a/drivers/spi/omap3_spi.c b/drivers/spi/omap3_spi.c index eb6ad371f0..98ee6d3d03 100644 --- a/drivers/spi/omap3_spi.c +++ b/drivers/spi/omap3_spi.c @@ -1,4 +1,7 @@ /* + * Copyright (C) 2016 Jagan Teki <jteki@openedev.com> + * Christophe Ricard <christophe.ricard@gmail.com> + * * Copyright (C) 2010 Dirk Behme <dirk.behme@googlemail.com> * * Driver for McSPI controller on OMAP3. Based on davinci_spi.c @@ -15,10 +18,13 @@ */ #include <common.h> +#include <dm.h> #include <spi.h> #include <malloc.h> #include <asm/io.h> +DECLARE_GLOBAL_DATA_PTR; + #if defined(CONFIG_AM33XX) || defined(CONFIG_AM43XX) #define OMAP3_MCSPI1_BASE 0x48030100 #define OMAP3_MCSPI2_BASE 0x481A0100 @@ -65,6 +71,8 @@ #define OMAP3_MCSPI_CHCTRL_DIS (0 << 0) #define OMAP3_MCSPI_WAKEUPENABLE_WKEN BIT(0) +#define MCSPI_PINDIR_D0_IN_D1_OUT 0 +#define MCSPI_PINDIR_D0_OUT_D1_IN 1 #define OMAP3_MCSPI_MAX_FREQ 48000000 #define SPI_WAIT_TIMEOUT 10 @@ -94,312 +102,124 @@ 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; + unsigned int pin_dir:1; }; -static inline struct omap3_spi_slave *to_omap3_spi(struct spi_slave *slave) +static void omap3_spi_write_chconf(struct omap3_spi_priv *priv, int val) { - 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) -{ - 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); + readl(&priv->regs->channel[priv->cs].chctrl); } -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, +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 i, chconf; + + 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) & - (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)) != - (OMAP3_MCSPI_CHSTAT_EOT | OMAP3_MCSPI_CHSTAT_TXS)); + 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; + int i, chconf; ulong start; - int chconf = readl(&ds->regs->channel[ds->slave.cs].chconf); + + 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); @@ -407,133 +227,452 @@ 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++){ /* 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; 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. + */ + if (priv->pin_dir == MCSPI_PINDIR_D0_IN_D1_OUT) { + confr &= ~(OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1); + confr |= OMAP3_MCSPI_CHCONF_DPE0; + } else { + confr &= ~OMAP3_MCSPI_CHCONF_DPE0; + confr |= OMAP3_MCSPI_CHCONF_IS|OMAP3_MCSPI_CHCONF_DPE1; + } + + /* 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) { - return 1; + /* do nothing */ } -void spi_cs_activate(struct spi_slave *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) +{ + _omap3_spi_claim_bus(priv); + _omap3_spi_set_wordlen(priv); + _omap3_spi_set_mode(priv); + _omap3_spi_set_speed(priv); + + return 0; } -void spi_cs_deactivate(struct spi_slave *slave) +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; +#ifdef CONFIG_OMAP3_SPI_D0_D1_SWAPPED + priv->pin_dir = MCSPI_PINDIR_D0_OUT_D1_IN; +#endif + + 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) +{ + 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; +} + +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; +} + +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 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 |