From 77b8d04854f486741471ad02b93b473b5b3d72f8 Mon Sep 17 00:00:00 2001 From: Jagan Teki Date: Mon, 14 Mar 2016 22:41:24 +0530 Subject: [PATCH] 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 Reviewed-by: Simon Glass Acked-by: Christophe Ricard Tested-by: Christophe Ricard Signed-off-by: Jagan Teki [Set priv->wordlen, Add Kconfig entry and file credit for dm conversion] Signed-off-by: Christophe Ricard --- drivers/spi/Kconfig | 7 + drivers/spi/omap3_spi.c | 869 +++++++++++++++++++++++----------------- 2 files changed, 511 insertions(+), 365 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 + * Christophe Ricard + * * Copyright (C) 2010 Dirk Behme * * Driver for McSPI controller on OMAP3. Based on davinci_spi.c @@ -15,10 +18,13 @@ */ #include +#include #include #include #include +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 @@ -94,58 +102,402 @@ 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 void omap3_spi_write_chconf(struct omap3_spi_priv *priv, int val) +{ + writel(val, &priv->regs->channel[priv->cs].chconf); + /* Flash post writes to make immediate effect */ + readl(&priv->regs->channel[priv->cs].chconf); +} + +static void omap3_spi_set_enable(struct omap3_spi_priv *priv, int enable) +{ + writel(enable, &priv->regs->channel[priv->cs].chctrl); + /* Flash post writes to make immediate effect */ + readl(&priv->regs->channel[priv->cs].chctrl); +} + +static int omap3_spi_write(struct omap3_spi_priv *priv, unsigned int len, + const void *txp, unsigned long flags) +{ + ulong start; + int i, chconf; + + chconf = readl(&priv->regs->channel[priv->cs].chconf); + + /* Enable the channel */ + omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN); + + chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK); + chconf |= (priv->wordlen - 1) << 7; + chconf |= OMAP3_MCSPI_CHCONF_TRM_TX_ONLY; + chconf |= OMAP3_MCSPI_CHCONF_FORCE; + 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(&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(&priv->regs->channel[priv->cs].chstat)); + return -1; + } + } + /* Write the data */ + unsigned int *tx = &priv->regs->channel[priv->cs].tx; + if (priv->wordlen > 16) + writel(((u32 *)txp)[i], tx); + else if (priv->wordlen > 8) + writel(((u16 *)txp)[i], tx); + else + writel(((u8 *)txp)[i], tx); + } + + /* wait to finish of transfer */ + 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(priv, OMAP3_MCSPI_CHCTRL_DIS); + + if (flags & SPI_XFER_END) { + + chconf &= ~OMAP3_MCSPI_CHCONF_FORCE; + omap3_spi_write_chconf(priv, chconf); + } + return 0; +} + +static int omap3_spi_read(struct omap3_spi_priv *priv, unsigned int len, + void *rxp, unsigned long flags) +{ + int i, chconf; + ulong start; + + chconf = readl(&priv->regs->channel[priv->cs].chconf); + + /* Enable the channel */ + omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN); + + chconf &= ~(OMAP3_MCSPI_CHCONF_TRM_MASK | OMAP3_MCSPI_CHCONF_WL_MASK); + chconf |= (priv->wordlen - 1) << 7; + chconf |= OMAP3_MCSPI_CHCONF_TRM_RX_ONLY; + chconf |= OMAP3_MCSPI_CHCONF_FORCE; + omap3_spi_write_chconf(priv, chconf); + + 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(&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(&priv->regs->channel[priv->cs].chstat)); + return -1; + } + } + + /* Disable the channel to prevent furher receiving */ + if (i == (len - 1)) + omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_DIS); + + /* Read the data */ + unsigned int *rx = &priv->regs->channel[priv->cs].rx; + if (priv->wordlen > 16) + ((u32 *)rxp)[i] = readl(rx); + else if (priv->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(priv, chconf); + } + + return 0; +} + +/*McSPI Transmit Receive Mode*/ +static int omap3_spi_txrx(struct omap3_spi_priv *priv, unsigned int len, + const void *txp, void *rxp, unsigned long flags) +{ + ulong start; + int chconf, i = 0; + + chconf = readl(&priv->regs->channel[priv->cs].chconf); + + /*Enable SPI channel*/ + 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 |= (priv->wordlen - 1) << 7; + chconf |= OMAP3_MCSPI_CHCONF_FORCE; + 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(&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(&priv->regs->channel[priv->cs].chstat)); + return -1; + } + } + /* Write the data */ + unsigned int *tx = &priv->regs->channel[priv->cs].tx; + if (priv->wordlen > 16) + writel(((u32 *)txp)[i], tx); + 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(&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(&priv->regs->channel[priv->cs].chstat)); + return -1; + } + } + /* Read the data */ + unsigned int *rx = &priv->regs->channel[priv->cs].rx; + if (priv->wordlen > 16) + ((u32 *)rxp)[i] = readl(rx); + 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(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(priv, chconf); + } + + return 0; +} + +static int _spi_xfer(struct omap3_spi_priv *priv, unsigned int bitlen, + const void *dout, void *din, unsigned long flags) +{ + unsigned int len; + int ret = -1; + + if (priv->wordlen < 4 || priv->wordlen > 32) { + printf("omap3_spi: invalid wordlen %d\n", priv->wordlen); + return -1; + } + + if (bitlen % priv->wordlen) + return -1; + + len = bitlen / priv->wordlen; + + if (bitlen == 0) { /* only change CS */ + int chconf = readl(&priv->regs->channel[priv->cs].chconf); + + if (flags & SPI_XFER_BEGIN) { + omap3_spi_set_enable(priv, OMAP3_MCSPI_CHCTRL_EN); + chconf |= OMAP3_MCSPI_CHCONF_FORCE; + omap3_spi_write_chconf(priv, chconf); + } + if (flags & SPI_XFER_END) { + chconf &= ~OMAP3_MCSPI_CHCONF_FORCE; + 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(priv, len, dout, din, flags); + else if (dout != NULL) + ret = omap3_spi_write(priv, len, dout, flags); + else if (din != NULL) + ret = omap3_spi_read(priv, len, din, flags); + } + return ret; +} + +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); } -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); - /* 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 */ } -struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, - unsigned int max_hz, unsigned int mode) +void spi_free_slave(struct spi_slave *slave) { - struct omap3_spi_slave *ds; + 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; /* @@ -159,41 +511,38 @@ struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs, switch (bus) { case 0: - regs = (struct mcspi *)OMAP3_MCSPI1_BASE; - break; + regs = (struct mcspi *)OMAP3_MCSPI1_BASE; + break; #ifdef OMAP3_MCSPI2_BASE case 1: - regs = (struct mcspi *)OMAP3_MCSPI2_BASE; - break; + regs = (struct mcspi *)OMAP3_MCSPI2_BASE; + break; #endif #ifdef OMAP3_MCSPI3_BASE case 2: - regs = (struct mcspi *)OMAP3_MCSPI3_BASE; - break; + regs = (struct mcspi *)OMAP3_MCSPI3_BASE; + break; #endif #ifdef OMAP3_MCSPI4_BASE case 3: - regs = (struct mcspi *)OMAP3_MCSPI4_BASE; - break; + regs = (struct mcspi *)OMAP3_MCSPI4_BASE; + break; #endif default: - printf("SPI error: unsupported bus %i. \ - Supported busses 0 - 3\n", bus); - return NULL; + 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); + ((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); + 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); - 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; + return 0; } -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