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-rw-r--r--drivers/spi/Kconfig11
-rw-r--r--drivers/spi/Makefile3
-rw-r--r--drivers/spi/spi-adi-v3.c (renamed from drivers/spi/spi-bfin-v3.c)433
-rw-r--r--drivers/spi/spi-atmel.c9
-rw-r--r--drivers/spi/spi-cadence.c673
5 files changed, 917 insertions, 212 deletions
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 722312fe19be..213b5cbb9dcc 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -91,8 +91,8 @@ config SPI_BFIN5XX
help
This is the SPI controller master driver for Blackfin 5xx processor.
-config SPI_BFIN_V3
- tristate "SPI controller v3 for Blackfin"
+config SPI_ADI_V3
+ tristate "SPI controller v3 for ADI"
depends on BF60x
help
This is the SPI controller v3 master driver
@@ -148,6 +148,13 @@ config SPI_BUTTERFLY
inexpensive battery powered microcontroller evaluation board.
This same cable can be used to flash new firmware.
+config SPI_CADENCE
+ tristate "Cadence SPI controller"
+ depends on ARM
+ help
+ This selects the Cadence SPI controller master driver
+ used by Xilinx Zynq.
+
config SPI_CLPS711X
tristate "CLPS711X host SPI controller"
depends on ARCH_CLPS711X || COMPILE_TEST
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index bd792669e563..929c9f5eac01 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -18,10 +18,11 @@ obj-$(CONFIG_SPI_BCM2835) += spi-bcm2835.o
obj-$(CONFIG_SPI_BCM63XX) += spi-bcm63xx.o
obj-$(CONFIG_SPI_BCM63XX_HSSPI) += spi-bcm63xx-hsspi.o
obj-$(CONFIG_SPI_BFIN5XX) += spi-bfin5xx.o
-obj-$(CONFIG_SPI_BFIN_V3) += spi-bfin-v3.o
+obj-$(CONFIG_SPI_ADI_V3) += spi-adi-v3.o
obj-$(CONFIG_SPI_BFIN_SPORT) += spi-bfin-sport.o
obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o
obj-$(CONFIG_SPI_BUTTERFLY) += spi-butterfly.o
+obj-$(CONFIG_SPI_CADENCE) += spi-cadence.o
obj-$(CONFIG_SPI_CLPS711X) += spi-clps711x.o
obj-$(CONFIG_SPI_COLDFIRE_QSPI) += spi-coldfire-qspi.o
obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o
diff --git a/drivers/spi/spi-bfin-v3.c b/drivers/spi/spi-adi-v3.c
index 4089d0e0d84e..dcb2287c7f8a 100644
--- a/drivers/spi/spi-bfin-v3.c
+++ b/drivers/spi/spi-adi-v3.c
@@ -1,7 +1,7 @@
/*
* Analog Devices SPI3 controller driver
*
- * Copyright (c) 2013 Analog Devices Inc.
+ * Copyright (c) 2014 Analog Devices Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
@@ -13,6 +13,7 @@
* GNU General Public License for more details.
*/
+#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
@@ -26,35 +27,34 @@
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
+#include <linux/spi/adi_spi3.h>
#include <linux/types.h>
-#include <asm/bfin_spi3.h>
-#include <asm/cacheflush.h>
#include <asm/dma.h>
#include <asm/portmux.h>
-enum bfin_spi_state {
+enum adi_spi_state {
START_STATE,
RUNNING_STATE,
DONE_STATE,
ERROR_STATE
};
-struct bfin_spi_master;
+struct adi_spi_master;
-struct bfin_spi_transfer_ops {
- void (*write) (struct bfin_spi_master *);
- void (*read) (struct bfin_spi_master *);
- void (*duplex) (struct bfin_spi_master *);
+struct adi_spi_transfer_ops {
+ void (*write) (struct adi_spi_master *);
+ void (*read) (struct adi_spi_master *);
+ void (*duplex) (struct adi_spi_master *);
};
/* runtime info for spi master */
-struct bfin_spi_master {
+struct adi_spi_master {
/* SPI framework hookup */
struct spi_master *master;
/* Regs base of SPI controller */
- struct bfin_spi_regs __iomem *regs;
+ struct adi_spi_regs __iomem *regs;
/* Pin request list */
u16 *pin_req;
@@ -65,7 +65,7 @@ struct bfin_spi_master {
/* Current message transfer state info */
struct spi_message *cur_msg;
struct spi_transfer *cur_transfer;
- struct bfin_spi_device *cur_chip;
+ struct adi_spi_device *cur_chip;
unsigned transfer_len;
/* transfer buffer */
@@ -90,12 +90,12 @@ struct bfin_spi_master {
u32 ssel;
unsigned long sclk;
- enum bfin_spi_state state;
+ enum adi_spi_state state;
- const struct bfin_spi_transfer_ops *ops;
+ const struct adi_spi_transfer_ops *ops;
};
-struct bfin_spi_device {
+struct adi_spi_device {
u32 control;
u32 clock;
u32 ssel;
@@ -105,17 +105,25 @@ struct bfin_spi_device {
u32 cs_gpio;
u32 tx_dummy_val; /* tx value for rx only transfer */
bool enable_dma;
- const struct bfin_spi_transfer_ops *ops;
+ const struct adi_spi_transfer_ops *ops;
};
-static void bfin_spi_enable(struct bfin_spi_master *drv_data)
+static void adi_spi_enable(struct adi_spi_master *drv_data)
{
- bfin_write_or(&drv_data->regs->control, SPI_CTL_EN);
+ u32 ctl;
+
+ ctl = ioread32(&drv_data->regs->control);
+ ctl |= SPI_CTL_EN;
+ iowrite32(ctl, &drv_data->regs->control);
}
-static void bfin_spi_disable(struct bfin_spi_master *drv_data)
+static void adi_spi_disable(struct adi_spi_master *drv_data)
{
- bfin_write_and(&drv_data->regs->control, ~SPI_CTL_EN);
+ u32 ctl;
+
+ ctl = ioread32(&drv_data->regs->control);
+ ctl &= ~SPI_CTL_EN;
+ iowrite32(ctl, &drv_data->regs->control);
}
/* Caculate the SPI_CLOCK register value based on input HZ */
@@ -128,35 +136,43 @@ static u32 hz_to_spi_clock(u32 sclk, u32 speed_hz)
return spi_clock;
}
-static int bfin_spi_flush(struct bfin_spi_master *drv_data)
+static int adi_spi_flush(struct adi_spi_master *drv_data)
{
unsigned long limit = loops_per_jiffy << 1;
/* wait for stop and clear stat */
- while (!(bfin_read(&drv_data->regs->status) & SPI_STAT_SPIF) && --limit)
+ while (!(ioread32(&drv_data->regs->status) & SPI_STAT_SPIF) && --limit)
cpu_relax();
- bfin_write(&drv_data->regs->status, 0xFFFFFFFF);
+ iowrite32(0xFFFFFFFF, &drv_data->regs->status);
return limit;
}
/* Chip select operation functions for cs_change flag */
-static void bfin_spi_cs_active(struct bfin_spi_master *drv_data, struct bfin_spi_device *chip)
+static void adi_spi_cs_active(struct adi_spi_master *drv_data, struct adi_spi_device *chip)
{
- if (likely(chip->cs < MAX_CTRL_CS))
- bfin_write_and(&drv_data->regs->ssel, ~chip->ssel);
- else
+ if (likely(chip->cs < MAX_CTRL_CS)) {
+ u32 reg;
+ reg = ioread32(&drv_data->regs->ssel);
+ reg &= ~chip->ssel;
+ iowrite32(reg, &drv_data->regs->ssel);
+ } else {
gpio_set_value(chip->cs_gpio, 0);
+ }
}
-static void bfin_spi_cs_deactive(struct bfin_spi_master *drv_data,
- struct bfin_spi_device *chip)
+static void adi_spi_cs_deactive(struct adi_spi_master *drv_data,
+ struct adi_spi_device *chip)
{
- if (likely(chip->cs < MAX_CTRL_CS))
- bfin_write_or(&drv_data->regs->ssel, chip->ssel);
- else
+ if (likely(chip->cs < MAX_CTRL_CS)) {
+ u32 reg;
+ reg = ioread32(&drv_data->regs->ssel);
+ reg |= chip->ssel;
+ iowrite32(reg, &drv_data->regs->ssel);
+ } else {
gpio_set_value(chip->cs_gpio, 1);
+ }
/* Move delay here for consistency */
if (chip->cs_chg_udelay)
@@ -164,187 +180,192 @@ static void bfin_spi_cs_deactive(struct bfin_spi_master *drv_data,
}
/* enable or disable the pin muxed by GPIO and SPI CS to work as SPI CS */
-static inline void bfin_spi_cs_enable(struct bfin_spi_master *drv_data,
- struct bfin_spi_device *chip)
+static inline void adi_spi_cs_enable(struct adi_spi_master *drv_data,
+ struct adi_spi_device *chip)
{
- if (chip->cs < MAX_CTRL_CS)
- bfin_write_or(&drv_data->regs->ssel, chip->ssel >> 8);
+ if (chip->cs < MAX_CTRL_CS) {
+ u32 reg;
+ reg = ioread32(&drv_data->regs->ssel);
+ reg |= chip->ssel >> 8;
+ iowrite32(reg, &drv_data->regs->ssel);
+ }
}
-static inline void bfin_spi_cs_disable(struct bfin_spi_master *drv_data,
- struct bfin_spi_device *chip)
+static inline void adi_spi_cs_disable(struct adi_spi_master *drv_data,
+ struct adi_spi_device *chip)
{
- if (chip->cs < MAX_CTRL_CS)
- bfin_write_and(&drv_data->regs->ssel, ~(chip->ssel >> 8));
+ if (chip->cs < MAX_CTRL_CS) {
+ u32 reg;
+ reg = ioread32(&drv_data->regs->ssel);
+ reg &= ~(chip->ssel >> 8);
+ iowrite32(reg, &drv_data->regs->ssel);
+ }
}
/* stop controller and re-config current chip*/
-static void bfin_spi_restore_state(struct bfin_spi_master *drv_data)
+static void adi_spi_restore_state(struct adi_spi_master *drv_data)
{
- struct bfin_spi_device *chip = drv_data->cur_chip;
+ struct adi_spi_device *chip = drv_data->cur_chip;
/* Clear status and disable clock */
- bfin_write(&drv_data->regs->status, 0xFFFFFFFF);
- bfin_write(&drv_data->regs->rx_control, 0x0);
- bfin_write(&drv_data->regs->tx_control, 0x0);
- bfin_spi_disable(drv_data);
-
- SSYNC();
+ iowrite32(0xFFFFFFFF, &drv_data->regs->status);
+ iowrite32(0x0, &drv_data->regs->rx_control);
+ iowrite32(0x0, &drv_data->regs->tx_control);
+ adi_spi_disable(drv_data);
/* Load the registers */
- bfin_write(&drv_data->regs->control, chip->control);
- bfin_write(&drv_data->regs->clock, chip->clock);
+ iowrite32(chip->control, &drv_data->regs->control);
+ iowrite32(chip->clock, &drv_data->regs->clock);
- bfin_spi_enable(drv_data);
+ adi_spi_enable(drv_data);
drv_data->tx_num = drv_data->rx_num = 0;
/* we always choose tx transfer initiate */
- bfin_write(&drv_data->regs->rx_control, SPI_RXCTL_REN);
- bfin_write(&drv_data->regs->tx_control,
- SPI_TXCTL_TEN | SPI_TXCTL_TTI);
- bfin_spi_cs_active(drv_data, chip);
+ iowrite32(SPI_RXCTL_REN, &drv_data->regs->rx_control);
+ iowrite32(SPI_TXCTL_TEN | SPI_TXCTL_TTI, &drv_data->regs->tx_control);
+ adi_spi_cs_active(drv_data, chip);
}
/* discard invalid rx data and empty rfifo */
-static inline void dummy_read(struct bfin_spi_master *drv_data)
+static inline void dummy_read(struct adi_spi_master *drv_data)
{
- while (!(bfin_read(&drv_data->regs->status) & SPI_STAT_RFE))
- bfin_read(&drv_data->regs->rfifo);
+ while (!(ioread32(&drv_data->regs->status) & SPI_STAT_RFE))
+ ioread32(&drv_data->regs->rfifo);
}
-static void bfin_spi_u8_write(struct bfin_spi_master *drv_data)
+static void adi_spi_u8_write(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->tx < drv_data->tx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u8 *)(drv_data->tx++)));
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(*(u8 *)(drv_data->tx++), &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- bfin_read(&drv_data->regs->rfifo);
+ ioread32(&drv_data->regs->rfifo);
}
}
-static void bfin_spi_u8_read(struct bfin_spi_master *drv_data)
+static void adi_spi_u8_read(struct adi_spi_master *drv_data)
{
u32 tx_val = drv_data->cur_chip->tx_dummy_val;
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, tx_val);
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(tx_val, &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u8 *)(drv_data->rx++) = bfin_read(&drv_data->regs->rfifo);
+ *(u8 *)(drv_data->rx++) = ioread32(&drv_data->regs->rfifo);
}
}
-static void bfin_spi_u8_duplex(struct bfin_spi_master *drv_data)
+static void adi_spi_u8_duplex(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u8 *)(drv_data->tx++)));
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(*(u8 *)(drv_data->tx++), &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u8 *)(drv_data->rx++) = bfin_read(&drv_data->regs->rfifo);
+ *(u8 *)(drv_data->rx++) = ioread32(&drv_data->regs->rfifo);
}
}
-static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u8 = {
- .write = bfin_spi_u8_write,
- .read = bfin_spi_u8_read,
- .duplex = bfin_spi_u8_duplex,
+static const struct adi_spi_transfer_ops adi_spi_transfer_ops_u8 = {
+ .write = adi_spi_u8_write,
+ .read = adi_spi_u8_read,
+ .duplex = adi_spi_u8_duplex,
};
-static void bfin_spi_u16_write(struct bfin_spi_master *drv_data)
+static void adi_spi_u16_write(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->tx < drv_data->tx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u16 *)drv_data->tx));
+ iowrite32(*(u16 *)drv_data->tx, &drv_data->regs->tfifo);
drv_data->tx += 2;
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- bfin_read(&drv_data->regs->rfifo);
+ ioread32(&drv_data->regs->rfifo);
}
}
-static void bfin_spi_u16_read(struct bfin_spi_master *drv_data)
+static void adi_spi_u16_read(struct adi_spi_master *drv_data)
{
u32 tx_val = drv_data->cur_chip->tx_dummy_val;
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, tx_val);
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(tx_val, &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u16 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo);
+ *(u16 *)drv_data->rx = ioread32(&drv_data->regs->rfifo);
drv_data->rx += 2;
}
}
-static void bfin_spi_u16_duplex(struct bfin_spi_master *drv_data)
+static void adi_spi_u16_duplex(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u16 *)drv_data->tx));
+ iowrite32(*(u16 *)drv_data->tx, &drv_data->regs->tfifo);
drv_data->tx += 2;
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u16 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo);
+ *(u16 *)drv_data->rx = ioread32(&drv_data->regs->rfifo);
drv_data->rx += 2;
}
}
-static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u16 = {
- .write = bfin_spi_u16_write,
- .read = bfin_spi_u16_read,
- .duplex = bfin_spi_u16_duplex,
+static const struct adi_spi_transfer_ops adi_spi_transfer_ops_u16 = {
+ .write = adi_spi_u16_write,
+ .read = adi_spi_u16_read,
+ .duplex = adi_spi_u16_duplex,
};
-static void bfin_spi_u32_write(struct bfin_spi_master *drv_data)
+static void adi_spi_u32_write(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->tx < drv_data->tx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u32 *)drv_data->tx));
+ iowrite32(*(u32 *)drv_data->tx, &drv_data->regs->tfifo);
drv_data->tx += 4;
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- bfin_read(&drv_data->regs->rfifo);
+ ioread32(&drv_data->regs->rfifo);
}
}
-static void bfin_spi_u32_read(struct bfin_spi_master *drv_data)
+static void adi_spi_u32_read(struct adi_spi_master *drv_data)
{
u32 tx_val = drv_data->cur_chip->tx_dummy_val;
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, tx_val);
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ iowrite32(tx_val, &drv_data->regs->tfifo);
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u32 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo);
+ *(u32 *)drv_data->rx = ioread32(&drv_data->regs->rfifo);
drv_data->rx += 4;
}
}
-static void bfin_spi_u32_duplex(struct bfin_spi_master *drv_data)
+static void adi_spi_u32_duplex(struct adi_spi_master *drv_data)
{
dummy_read(drv_data);
while (drv_data->rx < drv_data->rx_end) {
- bfin_write(&drv_data->regs->tfifo, (*(u32 *)drv_data->tx));
+ iowrite32(*(u32 *)drv_data->tx, &drv_data->regs->tfifo);
drv_data->tx += 4;
- while (bfin_read(&drv_data->regs->status) & SPI_STAT_RFE)
+ while (ioread32(&drv_data->regs->status) & SPI_STAT_RFE)
cpu_relax();
- *(u32 *)drv_data->rx = bfin_read(&drv_data->regs->rfifo);
+ *(u32 *)drv_data->rx = ioread32(&drv_data->regs->rfifo);
drv_data->rx += 4;
}
}
-static const struct bfin_spi_transfer_ops bfin_bfin_spi_transfer_ops_u32 = {
- .write = bfin_spi_u32_write,
- .read = bfin_spi_u32_read,
- .duplex = bfin_spi_u32_duplex,
+static const struct adi_spi_transfer_ops adi_spi_transfer_ops_u32 = {
+ .write = adi_spi_u32_write,
+ .read = adi_spi_u32_read,
+ .duplex = adi_spi_u32_duplex,
};
/* test if there is more transfer to be done */
-static void bfin_spi_next_transfer(struct bfin_spi_master *drv)
+static void adi_spi_next_transfer(struct adi_spi_master *drv)
{
struct spi_message *msg = drv->cur_msg;
struct spi_transfer *t = drv->cur_transfer;
@@ -360,15 +381,15 @@ static void bfin_spi_next_transfer(struct bfin_spi_master *drv)
}
}
-static void bfin_spi_giveback(struct bfin_spi_master *drv_data)
+static void adi_spi_giveback(struct adi_spi_master *drv_data)
{
- struct bfin_spi_device *chip = drv_data->cur_chip;
+ struct adi_spi_device *chip = drv_data->cur_chip;
- bfin_spi_cs_deactive(drv_data, chip);
+ adi_spi_cs_deactive(drv_data, chip);
spi_finalize_current_message(drv_data->master);
}
-static int bfin_spi_setup_transfer(struct bfin_spi_master *drv)
+static int adi_spi_setup_transfer(struct adi_spi_master *drv)
{
struct spi_transfer *t = drv->cur_transfer;
u32 cr, cr_width;
@@ -393,34 +414,33 @@ static int bfin_spi_setup_transfer(struct bfin_spi_master *drv)
switch (t->bits_per_word) {
case 8:
cr_width = SPI_CTL_SIZE08;
- drv->ops = &bfin_bfin_spi_transfer_ops_u8;
+ drv->ops = &adi_spi_transfer_ops_u8;
break;
case 16:
cr_width = SPI_CTL_SIZE16;
- drv->ops = &bfin_bfin_spi_transfer_ops_u16;
+ drv->ops = &adi_spi_transfer_ops_u16;
break;
case 32:
cr_width = SPI_CTL_SIZE32;
- drv->ops = &bfin_bfin_spi_transfer_ops_u32;
+ drv->ops = &adi_spi_transfer_ops_u32;
break;
default:
return -EINVAL;
}
- cr = bfin_read(&drv->regs->control) & ~SPI_CTL_SIZE;
+ cr = ioread32(&drv->regs->control) & ~SPI_CTL_SIZE;
cr |= cr_width;
- bfin_write(&drv->regs->control, cr);
+ iowrite32(cr, &drv->regs->control);
/* speed setup */
- bfin_write(&drv->regs->clock,
- hz_to_spi_clock(drv->sclk, t->speed_hz));
+ iowrite32(hz_to_spi_clock(drv->sclk, t->speed_hz), &drv->regs->clock);
return 0;
}
-static int bfin_spi_dma_xfer(struct bfin_spi_master *drv_data)
+static int adi_spi_dma_xfer(struct adi_spi_master *drv_data)
{
struct spi_transfer *t = drv_data->cur_transfer;
struct spi_message *msg = drv_data->cur_msg;
- struct bfin_spi_device *chip = drv_data->cur_chip;
+ struct adi_spi_device *chip = drv_data->cur_chip;
u32 dma_config;
unsigned long word_count, word_size;
void *tx_buf, *rx_buf;
@@ -498,17 +518,16 @@ static int bfin_spi_dma_xfer(struct bfin_spi_master *drv_data)
set_dma_config(drv_data->rx_dma, dma_config | WNR);
enable_dma(drv_data->tx_dma);
enable_dma(drv_data->rx_dma);
- SSYNC();
- bfin_write(&drv_data->regs->rx_control, SPI_RXCTL_REN | SPI_RXCTL_RDR_NE);
- SSYNC();
- bfin_write(&drv_data->regs->tx_control,
- SPI_TXCTL_TEN | SPI_TXCTL_TTI | SPI_TXCTL_TDR_NF);
+ iowrite32(SPI_RXCTL_REN | SPI_RXCTL_RDR_NE,
+ &drv_data->regs->rx_control);
+ iowrite32(SPI_TXCTL_TEN | SPI_TXCTL_TTI | SPI_TXCTL_TDR_NF,
+ &drv_data->regs->tx_control);
return 0;
}
-static int bfin_spi_pio_xfer(struct bfin_spi_master *drv_data)
+static int adi_spi_pio_xfer(struct adi_spi_master *drv_data)
{
struct spi_message *msg = drv_data->cur_msg;
@@ -529,19 +548,19 @@ static int bfin_spi_pio_xfer(struct bfin_spi_master *drv_data)
return -EIO;
}
- if (!bfin_spi_flush(drv_data))
+ if (!adi_spi_flush(drv_data))
return -EIO;
msg->actual_length += drv_data->transfer_len;
tasklet_schedule(&drv_data->pump_transfers);
return 0;
}
-static void bfin_spi_pump_transfers(unsigned long data)
+static void adi_spi_pump_transfers(unsigned long data)
{
- struct bfin_spi_master *drv_data = (struct bfin_spi_master *)data;
+ struct adi_spi_master *drv_data = (struct adi_spi_master *)data;
struct spi_message *msg = NULL;
struct spi_transfer *t = NULL;
- struct bfin_spi_device *chip = NULL;
+ struct adi_spi_device *chip = NULL;
int ret;
/* Get current state information */
@@ -552,7 +571,7 @@ static void bfin_spi_pump_transfers(unsigned long data)
/* Handle for abort */
if (drv_data->state == ERROR_STATE) {
msg->status = -EIO;
- bfin_spi_giveback(drv_data);
+ adi_spi_giveback(drv_data);
return;
}
@@ -560,14 +579,14 @@ static void bfin_spi_pump_transfers(unsigned long data)
if (t->delay_usecs)
udelay(t->delay_usecs);
if (t->cs_change)
- bfin_spi_cs_deactive(drv_data, chip);
- bfin_spi_next_transfer(drv_data);
+ adi_spi_cs_deactive(drv_data, chip);
+ adi_spi_next_transfer(drv_data);
t = drv_data->cur_transfer;
}
/* Handle end of message */
if (drv_data->state == DONE_STATE) {
msg->status = 0;
- bfin_spi_giveback(drv_data);
+ adi_spi_giveback(drv_data);
return;
}
@@ -577,34 +596,34 @@ static void bfin_spi_pump_transfers(unsigned long data)
return;
}
- ret = bfin_spi_setup_transfer(drv_data);
+ ret = adi_spi_setup_transfer(drv_data);
if (ret) {
msg->status = ret;
- bfin_spi_giveback(drv_data);
+ adi_spi_giveback(drv_data);
}
- bfin_write(&drv_data->regs->status, 0xFFFFFFFF);
- bfin_spi_cs_active(drv_data, chip);
+ iowrite32(0xFFFFFFFF, &drv_data->regs->status);
+ adi_spi_cs_active(drv_data, chip);
drv_data->state = RUNNING_STATE;
if (chip->enable_dma)
- ret = bfin_spi_dma_xfer(drv_data);
+ ret = adi_spi_dma_xfer(drv_data);
else
- ret = bfin_spi_pio_xfer(drv_data);
+ ret = adi_spi_pio_xfer(drv_data);
if (ret) {
msg->status = ret;
- bfin_spi_giveback(drv_data);
+ adi_spi_giveback(drv_data);
}
}
-static int bfin_spi_transfer_one_message(struct spi_master *master,
+static int adi_spi_transfer_one_message(struct spi_master *master,
struct spi_message *m)
{
- struct bfin_spi_master *drv_data = spi_master_get_devdata(master);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(master);
drv_data->cur_msg = m;
drv_data->cur_chip = spi_get_ctldata(drv_data->cur_msg->spi);
- bfin_spi_restore_state(drv_data);
+ adi_spi_restore_state(drv_data);
drv_data->state = START_STATE;
drv_data->cur_transfer = list_entry(drv_data->cur_msg->transfers.next,
@@ -630,15 +649,15 @@ static const u16 ssel[][MAX_SPI_SSEL] = {
P_SPI2_SSEL6, P_SPI2_SSEL7},
};
-static int bfin_spi_setup(struct spi_device *spi)
+static int adi_spi_setup(struct spi_device *spi)
{
- struct bfin_spi_master *drv_data = spi_master_get_devdata(spi->master);
- struct bfin_spi_device *chip = spi_get_ctldata(spi);
- u32 bfin_ctl_reg = SPI_CTL_ODM | SPI_CTL_PSSE;
+ struct adi_spi_master *drv_data = spi_master_get_devdata(spi->master);
+ struct adi_spi_device *chip = spi_get_ctldata(spi);
+ u32 ctl_reg = SPI_CTL_ODM | SPI_CTL_PSSE;
int ret = -EINVAL;
if (!chip) {
- struct bfin_spi3_chip *chip_info = spi->controller_data;
+ struct adi_spi3_chip *chip_info = spi->controller_data;
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip) {
@@ -646,7 +665,7 @@ static int bfin_spi_setup(struct spi_device *spi)
return -ENOMEM;
}
if (chip_info) {
- if (chip_info->control & ~bfin_ctl_reg) {
+ if (chip_info->control & ~ctl_reg) {
dev_err(&spi->dev,
"do not set bits that the SPI framework manages\n");
goto error;
@@ -657,6 +676,7 @@ static int bfin_spi_setup(struct spi_device *spi)
chip->enable_dma = chip_info->enable_dma;
}
chip->cs = spi->chip_select;
+
if (chip->cs < MAX_CTRL_CS) {
chip->ssel = (1 << chip->cs) << 8;
ret = peripheral_request(ssel[spi->master->bus_num]
@@ -678,7 +698,7 @@ static int bfin_spi_setup(struct spi_device *spi)
}
/* force a default base state */
- chip->control &= bfin_ctl_reg;
+ chip->control &= ctl_reg;
if (spi->mode & SPI_CPOL)
chip->control |= SPI_CTL_CPOL;
@@ -692,8 +712,8 @@ static int bfin_spi_setup(struct spi_device *spi)
chip->clock = hz_to_spi_clock(drv_data->sclk, spi->max_speed_hz);
- bfin_spi_cs_enable(drv_data, chip);
- bfin_spi_cs_deactive(drv_data, chip);
+ adi_spi_cs_enable(drv_data, chip);
+ adi_spi_cs_deactive(drv_data, chip);
return 0;
error:
@@ -705,10 +725,10 @@ error:
return ret;
}
-static void bfin_spi_cleanup(struct spi_device *spi)
+static void adi_spi_cleanup(struct spi_device *spi)
{
- struct bfin_spi_device *chip = spi_get_ctldata(spi);
- struct bfin_spi_master *drv_data = spi_master_get_devdata(spi->master);
+ struct adi_spi_device *chip = spi_get_ctldata(spi);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(spi->master);
if (!chip)
return;
@@ -716,7 +736,7 @@ static void bfin_spi_cleanup(struct spi_device *spi)
if (chip->cs < MAX_CTRL_CS) {
peripheral_free(ssel[spi->master->bus_num]
[chip->cs-1]);
- bfin_spi_cs_disable(drv_data, chip);
+ adi_spi_cs_disable(drv_data, chip);
} else {
gpio_free(chip->cs_gpio);
}
@@ -725,10 +745,11 @@ static void bfin_spi_cleanup(struct spi_device *spi)
spi_set_ctldata(spi, NULL);
}
-static irqreturn_t bfin_spi_tx_dma_isr(int irq, void *dev_id)
+static irqreturn_t adi_spi_tx_dma_isr(int irq, void *dev_id)
{
- struct bfin_spi_master *drv_data = dev_id;
+ struct adi_spi_master *drv_data = dev_id;
u32 dma_stat = get_dma_curr_irqstat(drv_data->tx_dma);
+ u32 tx_ctl;
clear_dma_irqstat(drv_data->tx_dma);
if (dma_stat & DMA_DONE) {
@@ -739,13 +760,15 @@ static irqreturn_t bfin_spi_tx_dma_isr(int irq, void *dev_id)
if (drv_data->tx)
drv_data->state = ERROR_STATE;
}
- bfin_write_and(&drv_data->regs->tx_control, ~SPI_TXCTL_TDR_NF);
+ tx_ctl = ioread32(&drv_data->regs->tx_control);
+ tx_ctl &= ~SPI_TXCTL_TDR_NF;
+ iowrite32(tx_ctl, &drv_data->regs->tx_control);
return IRQ_HANDLED;
}
-static irqreturn_t bfin_spi_rx_dma_isr(int irq, void *dev_id)
+static irqreturn_t adi_spi_rx_dma_isr(int irq, void *dev_id)
{
- struct bfin_spi_master *drv_data = dev_id;
+ struct adi_spi_master *drv_data = dev_id;
struct spi_message *msg = drv_data->cur_msg;
u32 dma_stat = get_dma_curr_irqstat(drv_data->rx_dma);
@@ -760,8 +783,8 @@ static irqreturn_t bfin_spi_rx_dma_isr(int irq, void *dev_id)
dev_err(&drv_data->master->dev,
"spi rx dma error: %d\n", dma_stat);
}
- bfin_write(&drv_data->regs->tx_control, 0);
- bfin_write(&drv_data->regs->rx_control, 0);
+ iowrite32(0, &drv_data->regs->tx_control);
+ iowrite32(0, &drv_data->regs->rx_control);
if (drv_data->rx_num != drv_data->tx_num)
dev_dbg(&drv_data->master->dev,
"dma interrupt missing: tx=%d,rx=%d\n",
@@ -770,15 +793,15 @@ static irqreturn_t bfin_spi_rx_dma_isr(int irq, void *dev_id)
return IRQ_HANDLED;
}
-static int bfin_spi_probe(struct platform_device *pdev)
+static int adi_spi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
- struct bfin_spi3_master *info = dev_get_platdata(dev);
+ struct adi_spi3_master *info = dev_get_platdata(dev);
struct spi_master *master;
- struct bfin_spi_master *drv_data;
+ struct adi_spi_master *drv_data;
struct resource *mem, *res;
unsigned int tx_dma, rx_dma;
- unsigned long sclk;
+ struct clk *sclk;
int ret;
if (!info) {
@@ -786,10 +809,10 @@ static int bfin_spi_probe(struct platform_device *pdev)
return -ENODEV;
}
- sclk = get_sclk1();
- if (!sclk) {
- dev_err(dev, "can not get sclk1\n");
- return -ENXIO;
+ sclk = devm_clk_get(dev, "spi");
+ if (IS_ERR(sclk)) {
+ dev_err(dev, "can not get spi clock\n");
+ return PTR_ERR(sclk);
}
res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
@@ -819,9 +842,9 @@ static int bfin_spi_probe(struct platform_device *pdev)
master->bus_num = pdev->id;
master->num_chipselect = info->num_chipselect;
- master->cleanup = bfin_spi_cleanup;
- master->setup = bfin_spi_setup;
- master->transfer_one_message = bfin_spi_transfer_one_message;
+ master->cleanup = adi_spi_cleanup;
+ master->setup = adi_spi_setup;
+ master->transfer_one_message = adi_spi_transfer_one_message;
master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) |
SPI_BPW_MASK(8);
@@ -830,7 +853,7 @@ static int bfin_spi_probe(struct platform_device *pdev)
drv_data->tx_dma = tx_dma;
drv_data->rx_dma = rx_dma;
drv_data->pin_req = info->pin_req;
- drv_data->sclk = sclk;
+ drv_data->sclk = clk_get_rate(sclk);
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
drv_data->regs = devm_ioremap_resource(dev, mem);
@@ -845,28 +868,28 @@ static int bfin_spi_probe(struct platform_device *pdev)
dev_err(dev, "can not request SPI TX DMA channel\n");
goto err_put_master;
}
- set_dma_callback(tx_dma, bfin_spi_tx_dma_isr, drv_data);
+ set_dma_callback(tx_dma, adi_spi_tx_dma_isr, drv_data);
ret = request_dma(rx_dma, "SPI_RX_DMA");
if (ret) {
dev_err(dev, "can not request SPI RX DMA channel\n");
goto err_free_tx_dma;
}
- set_dma_callback(drv_data->rx_dma, bfin_spi_rx_dma_isr, drv_data);
+ set_dma_callback(drv_data->rx_dma, adi_spi_rx_dma_isr, drv_data);
/* request CLK, MOSI and MISO */
- ret = peripheral_request_list(drv_data->pin_req, "bfin-spi3");
+ ret = peripheral_request_list(drv_data->pin_req, "adi-spi3");
if (ret < 0) {
dev_err(dev, "can not request spi pins\n");
goto err_free_rx_dma;
}
- bfin_write(&drv_data->regs->control, SPI_CTL_MSTR | SPI_CTL_CPHA);
- bfin_write(&drv_data->regs->ssel, 0x0000FE00);
- bfin_write(&drv_data->regs->delay, 0x0);
+ iowrite32(SPI_CTL_MSTR | SPI_CTL_CPHA, &drv_data->regs->control);
+ iowrite32(0x0000FE00, &drv_data->regs->ssel);
+ iowrite32(0x0, &drv_data->regs->delay);
tasklet_init(&drv_data->pump_transfers,
- bfin_spi_pump_transfers, (unsigned long)drv_data);
+ adi_spi_pump_transfers, (unsigned long)drv_data);
/* register with the SPI framework */
ret = devm_spi_register_master(dev, master);
if (ret) {
@@ -888,43 +911,41 @@ err_put_master:
return ret;
}
-static int bfin_spi_remove(struct platform_device *pdev)
+static int adi_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
- struct bfin_spi_master *drv_data = spi_master_get_devdata(master);
-
- bfin_spi_disable(drv_data);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(master);
+ adi_spi_disable(drv_data);
peripheral_free_list(drv_data->pin_req);
free_dma(drv_data->rx_dma);
free_dma(drv_data->tx_dma);
-
return 0;
}
#ifdef CONFIG_PM
-static int bfin_spi_suspend(struct device *dev)
+static int adi_spi_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
- struct bfin_spi_master *drv_data = spi_master_get_devdata(master);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(master);
spi_master_suspend(master);
- drv_data->control = bfin_read(&drv_data->regs->control);
- drv_data->ssel = bfin_read(&drv_data->regs->ssel);
+ drv_data->control = ioread32(&drv_data->regs->control);
+ drv_data->ssel = ioread32(&drv_data->regs->ssel);
- bfin_write(&drv_data->regs->control, SPI_CTL_MSTR | SPI_CTL_CPHA);
- bfin_write(&drv_data->regs->ssel, 0x0000FE00);
+ iowrite32(SPI_CTL_MSTR | SPI_CTL_CPHA, &drv_data->regs->control);
+ iowrite32(0x0000FE00, &drv_data->regs->ssel);
dma_disable_irq(drv_data->rx_dma);
dma_disable_irq(drv_data->tx_dma);
return 0;
}
-static int bfin_spi_resume(struct device *dev)
+static int adi_spi_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
- struct bfin_spi_master *drv_data = spi_master_get_devdata(master);
+ struct adi_spi_master *drv_data = spi_master_get_devdata(master);
int ret = 0;
/* bootrom may modify spi and dma status when resume in spi boot mode */
@@ -932,8 +953,8 @@ static int bfin_spi_resume(struct device *dev)
dma_enable_irq(drv_data->rx_dma);
dma_enable_irq(drv_data->tx_dma);
- bfin_write(&drv_data->regs->control, drv_data->control);
- bfin_write(&drv_data->regs->ssel, drv_data->ssel);
+ iowrite32(drv_data->control, &drv_data->regs->control);
+ iowrite32(drv_data->ssel, &drv_data->regs->ssel);
ret = spi_master_resume(master);
if (ret) {
@@ -944,21 +965,21 @@ static int bfin_spi_resume(struct device *dev)
return ret;
}
#endif
-static const struct dev_pm_ops bfin_spi_pm_ops = {
- SET_SYSTEM_SLEEP_PM_OPS(bfin_spi_suspend, bfin_spi_resume)
+static const struct dev_pm_ops adi_spi_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(adi_spi_suspend, adi_spi_resume)
};
-MODULE_ALIAS("platform:bfin-spi3");
-static struct platform_driver bfin_spi_driver = {
+MODULE_ALIAS("platform:adi-spi3");
+static struct platform_driver adi_spi_driver = {
.driver = {
- .name = "bfin-spi3",
+ .name = "adi-spi3",
.owner = THIS_MODULE,
- .pm = &bfin_spi_pm_ops,
+ .pm = &adi_spi_pm_ops,
},
- .remove = bfin_spi_remove,
+ .remove = adi_spi_remove,
};
-module_platform_driver_probe(bfin_spi_driver, bfin_spi_probe);
+module_platform_driver_probe(adi_spi_driver, adi_spi_probe);
MODULE_DESCRIPTION("Analog Devices SPI3 controller driver");
MODULE_AUTHOR("Scott Jiang <Scott.Jiang.Linux@gmail.com>");
diff --git a/drivers/spi/spi-atmel.c b/drivers/spi/spi-atmel.c
index 079e6b1b0cdb..92a6f0d93233 100644
--- a/drivers/spi/spi-atmel.c
+++ b/drivers/spi/spi-atmel.c
@@ -224,7 +224,7 @@ struct atmel_spi {
struct platform_device *pdev;
struct spi_transfer *current_transfer;
- unsigned long current_remaining_bytes;
+ int current_remaining_bytes;
int done_status;
struct completion xfer_completion;
@@ -874,8 +874,9 @@ atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
spi_readl(as, RDR);
}
if (xfer->bits_per_word > 8) {
- as->current_remaining_bytes -= 2;
- if (as->current_remaining_bytes < 0)
+ if (as->current_remaining_bytes > 2)
+ as->current_remaining_bytes -= 2;
+ else
as->current_remaining_bytes = 0;
} else {
as->current_remaining_bytes--;
@@ -1110,6 +1111,8 @@ static int atmel_spi_one_transfer(struct spi_master *master,
atmel_spi_next_xfer_pio(master, xfer);
} else {
as->current_remaining_bytes -= len;
+ if (as->current_remaining_bytes < 0)
+ as->current_remaining_bytes = 0;
}
} else {
atmel_spi_next_xfer_pio(master, xfer);
diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c
new file mode 100644
index 000000000000..bb758978465d
--- /dev/null
+++ b/drivers/spi/spi-cadence.c
@@ -0,0 +1,673 @@
+/*
+ * Cadence SPI controller driver (master mode only)
+ *
+ * Copyright (C) 2008 - 2014 Xilinx, Inc.
+ *
+ * based on Blackfin On-Chip SPI Driver (spi_bfin5xx.c)
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of_irq.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
+
+/* Name of this driver */
+#define CDNS_SPI_NAME "cdns-spi"
+
+/* Register offset definitions */
+#define CDNS_SPI_CR_OFFSET 0x00 /* Configuration Register, RW */
+#define CDNS_SPI_ISR_OFFSET 0x04 /* Interrupt Status Register, RO */
+#define CDNS_SPI_IER_OFFSET 0x08 /* Interrupt Enable Register, WO */
+#define CDNS_SPI_IDR_OFFSET 0x0c /* Interrupt Disable Register, WO */
+#define CDNS_SPI_IMR_OFFSET 0x10 /* Interrupt Enabled Mask Register, RO */
+#define CDNS_SPI_ER_OFFSET 0x14 /* Enable/Disable Register, RW */
+#define CDNS_SPI_DR_OFFSET 0x18 /* Delay Register, RW */
+#define CDNS_SPI_TXD_OFFSET 0x1C /* Data Transmit Register, WO */
+#define CDNS_SPI_RXD_OFFSET 0x20 /* Data Receive Register, RO */
+#define CDNS_SPI_SICR_OFFSET 0x24 /* Slave Idle Count Register, RW */
+#define CDNS_SPI_THLD_OFFSET 0x28 /* Transmit FIFO Watermark Register,RW */
+
+/*
+ * SPI Configuration Register bit Masks
+ *
+ * This register contains various control bits that affect the operation
+ * of the SPI controller
+ */
+#define CDNS_SPI_CR_MANSTRT_MASK 0x00010000 /* Manual TX Start */
+#define CDNS_SPI_CR_CPHA_MASK 0x00000004 /* Clock Phase Control */
+#define CDNS_SPI_CR_CPOL_MASK 0x00000002 /* Clock Polarity Control */
+#define CDNS_SPI_CR_SSCTRL_MASK 0x00003C00 /* Slave Select Mask */
+#define CDNS_SPI_CR_BAUD_DIV_MASK 0x00000038 /* Baud Rate Divisor Mask */
+#define CDNS_SPI_CR_MSTREN_MASK 0x00000001 /* Master Enable Mask */
+#define CDNS_SPI_CR_MANSTRTEN_MASK 0x00008000 /* Manual TX Enable Mask */
+#define CDNS_SPI_CR_SSFORCE_MASK 0x00004000 /* Manual SS Enable Mask */
+#define CDNS_SPI_CR_BAUD_DIV_4_MASK 0x00000008 /* Default Baud Div Mask */
+#define CDNS_SPI_CR_DEFAULT_MASK (CDNS_SPI_CR_MSTREN_MASK | \
+ CDNS_SPI_CR_SSCTRL_MASK | \
+ CDNS_SPI_CR_SSFORCE_MASK | \
+ CDNS_SPI_CR_BAUD_DIV_4_MASK)
+
+/*
+ * SPI Configuration Register - Baud rate and slave select
+ *
+ * These are the values used in the calculation of baud rate divisor and
+ * setting the slave select.
+ */
+
+#define CDNS_SPI_BAUD_DIV_MAX 7 /* Baud rate divisor maximum */
+#define CDNS_SPI_BAUD_DIV_MIN 1 /* Baud rate divisor minimum */
+#define CDNS_SPI_BAUD_DIV_SHIFT 3 /* Baud rate divisor shift in CR */
+#define CDNS_SPI_SS_SHIFT 10 /* Slave Select field shift in CR */
+#define CDNS_SPI_SS0 0x1 /* Slave Select zero */
+
+/*
+ * SPI Interrupt Registers bit Masks
+ *
+ * All the four interrupt registers (Status/Mask/Enable/Disable) have the same
+ * bit definitions.
+ */
+#define CDNS_SPI_IXR_TXOW_MASK 0x00000004 /* SPI TX FIFO Overwater */
+#define CDNS_SPI_IXR_MODF_MASK 0x00000002 /* SPI Mode Fault */
+#define CDNS_SPI_IXR_RXNEMTY_MASK 0x00000010 /* SPI RX FIFO Not Empty */
+#define CDNS_SPI_IXR_DEFAULT_MASK (CDNS_SPI_IXR_TXOW_MASK | \
+ CDNS_SPI_IXR_MODF_MASK)
+#define CDNS_SPI_IXR_TXFULL_MASK 0x00000008 /* SPI TX Full */
+#define CDNS_SPI_IXR_ALL_MASK 0x0000007F /* SPI all interrupts */
+
+/*
+ * SPI Enable Register bit Masks
+ *
+ * This register is used to enable or disable the SPI controller
+ */
+#define CDNS_SPI_ER_ENABLE_MASK 0x00000001 /* SPI Enable Bit Mask */
+#define CDNS_SPI_ER_DISABLE_MASK 0x0 /* SPI Disable Bit Mask */
+
+/* SPI FIFO depth in bytes */
+#define CDNS_SPI_FIFO_DEPTH 128
+
+/* Default number of chip select lines */
+#define CDNS_SPI_DEFAULT_NUM_CS 4
+
+/**
+ * struct cdns_spi - This definition defines spi driver instance
+ * @regs: Virtual address of the SPI controller registers
+ * @ref_clk: Pointer to the peripheral clock
+ * @pclk: Pointer to the APB clock
+ * @speed_hz: Current SPI bus clock speed in Hz
+ * @txbuf: Pointer to the TX buffer
+ * @rxbuf: Pointer to the RX buffer
+ * @tx_bytes: Number of bytes left to transfer
+ * @rx_bytes: Number of bytes requested
+ * @dev_busy: Device busy flag
+ * @is_decoded_cs: Flag for decoder property set or not
+ */
+struct cdns_spi {
+ void __iomem *regs;
+ struct clk *ref_clk;
+ struct clk *pclk;
+ u32 speed_hz;
+ const u8 *txbuf;
+ u8 *rxbuf;
+ int tx_bytes;
+ int rx_bytes;
+ u8 dev_busy;
+ u32 is_decoded_cs;
+};
+
+/* Macros for the SPI controller read/write */
+static inline u32 cdns_spi_read(struct cdns_spi *xspi, u32 offset)
+{
+ return readl_relaxed(xspi->regs + offset);
+}
+
+static inline void cdns_spi_write(struct cdns_spi *xspi, u32 offset, u32 val)
+{
+ writel_relaxed(val, xspi->regs + offset);
+}
+
+/**
+ * cdns_spi_init_hw - Initialize the hardware and configure the SPI controller
+ * @xspi: Pointer to the cdns_spi structure
+ *
+ * On reset the SPI controller is configured to be in master mode, baud rate
+ * divisor is set to 4, threshold value for TX FIFO not full interrupt is set
+ * to 1 and size of the word to be transferred as 8 bit.
+ * This function initializes the SPI controller to disable and clear all the
+ * interrupts, enable manual slave select and manual start, deselect all the
+ * chip select lines, and enable the SPI controller.
+ */
+static void cdns_spi_init_hw(struct cdns_spi *xspi)
+{
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_DISABLE_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
+ CDNS_SPI_IXR_ALL_MASK);
+
+ /* Clear the RX FIFO */
+ while (cdns_spi_read(xspi, CDNS_SPI_ISR_OFFSET) &
+ CDNS_SPI_IXR_RXNEMTY_MASK)
+ cdns_spi_read(xspi, CDNS_SPI_RXD_OFFSET);
+
+ cdns_spi_write(xspi, CDNS_SPI_ISR_OFFSET,
+ CDNS_SPI_IXR_ALL_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET,
+ CDNS_SPI_CR_DEFAULT_MASK);
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_ENABLE_MASK);
+}
+
+/**
+ * cdns_spi_chipselect - Select or deselect the chip select line
+ * @spi: Pointer to the spi_device structure
+ * @is_on: Select(0) or deselect (1) the chip select line
+ */
+static void cdns_spi_chipselect(struct spi_device *spi, bool is_high)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
+ u32 ctrl_reg;
+
+ ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+
+ if (is_high) {
+ /* Deselect the slave */
+ ctrl_reg |= CDNS_SPI_CR_SSCTRL_MASK;
+ } else {
+ /* Select the slave */
+ ctrl_reg &= ~CDNS_SPI_CR_SSCTRL_MASK;
+ if (!(xspi->is_decoded_cs))
+ ctrl_reg |= ((~(CDNS_SPI_SS0 << spi->chip_select)) <<
+ CDNS_SPI_SS_SHIFT) &
+ CDNS_SPI_CR_SSCTRL_MASK;
+ else
+ ctrl_reg |= (spi->chip_select << CDNS_SPI_SS_SHIFT) &
+ CDNS_SPI_CR_SSCTRL_MASK;
+ }
+
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+}
+
+/**
+ * cdns_spi_config_clock_mode - Sets clock polarity and phase
+ * @spi: Pointer to the spi_device structure
+ *
+ * Sets the requested clock polarity and phase.
+ */
+static void cdns_spi_config_clock_mode(struct spi_device *spi)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
+ u32 ctrl_reg;
+
+ ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+
+ /* Set the SPI clock phase and clock polarity */
+ ctrl_reg &= ~(CDNS_SPI_CR_CPHA_MASK | CDNS_SPI_CR_CPOL_MASK);
+ if (spi->mode & SPI_CPHA)
+ ctrl_reg |= CDNS_SPI_CR_CPHA_MASK;
+ if (spi->mode & SPI_CPOL)
+ ctrl_reg |= CDNS_SPI_CR_CPOL_MASK;
+
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+}
+
+/**
+ * cdns_spi_config_clock_freq - Sets clock frequency
+ * @spi: Pointer to the spi_device structure
+ * @transfer: Pointer to the spi_transfer structure which provides
+ * information about next transfer setup parameters
+ *
+ * Sets the requested clock frequency.
+ * Note: If the requested frequency is not an exact match with what can be
+ * obtained using the prescalar value the driver sets the clock frequency which
+ * is lower than the requested frequency (maximum lower) for the transfer. If
+ * the requested frequency is higher or lower than that is supported by the SPI
+ * controller the driver will set the highest or lowest frequency supported by
+ * controller.
+ */
+static void cdns_spi_config_clock_freq(struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
+ u32 ctrl_reg, baud_rate_val;
+ unsigned long frequency;
+
+ frequency = clk_get_rate(xspi->ref_clk);
+
+ ctrl_reg = cdns_spi_read(xspi, CDNS_SPI_CR_OFFSET);
+
+ /* Set the clock frequency */
+ if (xspi->speed_hz != transfer->speed_hz) {
+ /* first valid value is 1 */
+ baud_rate_val = CDNS_SPI_BAUD_DIV_MIN;
+ while ((baud_rate_val < CDNS_SPI_BAUD_DIV_MAX) &&
+ (frequency / (2 << baud_rate_val)) > transfer->speed_hz)
+ baud_rate_val++;
+
+ ctrl_reg &= ~CDNS_SPI_CR_BAUD_DIV_MASK;
+ ctrl_reg |= baud_rate_val << CDNS_SPI_BAUD_DIV_SHIFT;
+
+ xspi->speed_hz = frequency / (2 << baud_rate_val);
+ }
+ cdns_spi_write(xspi, CDNS_SPI_CR_OFFSET, ctrl_reg);
+}
+
+/**
+ * cdns_spi_setup_transfer - Configure SPI controller for specified transfer
+ * @spi: Pointer to the spi_device structure
+ * @transfer: Pointer to the spi_transfer structure which provides
+ * information about next transfer setup parameters
+ *
+ * Sets the operational mode of SPI controller for the next SPI transfer and
+ * sets the requested clock frequency.
+ *
+ * Return: Always 0
+ */
+static int cdns_spi_setup_transfer(struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(spi->master);
+
+ cdns_spi_config_clock_freq(spi, transfer);
+
+ dev_dbg(&spi->dev, "%s, mode %d, %u bits/w, %u clock speed\n",
+ __func__, spi->mode, spi->bits_per_word,
+ xspi->speed_hz);
+
+ return 0;
+}
+
+/**
+ * cdns_spi_fill_tx_fifo - Fills the TX FIFO with as many bytes as possible
+ * @xspi: Pointer to the cdns_spi structure
+ */
+static void cdns_spi_fill_tx_fifo(struct cdns_spi *xspi)
+{
+ unsigned long trans_cnt = 0;
+
+ while ((trans_cnt < CDNS_SPI_FIFO_DEPTH) &&
+ (xspi->tx_bytes > 0)) {
+ if (xspi->txbuf)
+ cdns_spi_write(xspi, CDNS_SPI_TXD_OFFSET,
+ *xspi->txbuf++);
+ else
+ cdns_spi_write(xspi, CDNS_SPI_TXD_OFFSET, 0);
+
+ xspi->tx_bytes--;
+ trans_cnt++;
+ }
+}
+
+/**
+ * cdns_spi_irq - Interrupt service routine of the SPI controller
+ * @irq: IRQ number
+ * @dev_id: Pointer to the xspi structure
+ *
+ * This function handles TX empty and Mode Fault interrupts only.
+ * On TX empty interrupt this function reads the received data from RX FIFO and
+ * fills the TX FIFO if there is any data remaining to be transferred.
+ * On Mode Fault interrupt this function indicates that transfer is completed,
+ * the SPI subsystem will identify the error as the remaining bytes to be
+ * transferred is non-zero.
+ *
+ * Return: IRQ_HANDLED when handled; IRQ_NONE otherwise.
+ */
+static irqreturn_t cdns_spi_irq(int irq, void *dev_id)
+{
+ struct spi_master *master = dev_id;
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+ u32 intr_status, status;
+
+ status = IRQ_NONE;
+ intr_status = cdns_spi_read(xspi, CDNS_SPI_ISR_OFFSET);
+ cdns_spi_write(xspi, CDNS_SPI_ISR_OFFSET, intr_status);
+
+ if (intr_status & CDNS_SPI_IXR_MODF_MASK) {
+ /* Indicate that transfer is completed, the SPI subsystem will
+ * identify the error as the remaining bytes to be
+ * transferred is non-zero
+ */
+ cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
+ CDNS_SPI_IXR_DEFAULT_MASK);
+ spi_finalize_current_transfer(master);
+ status = IRQ_HANDLED;
+ } else if (intr_status & CDNS_SPI_IXR_TXOW_MASK) {
+ unsigned long trans_cnt;
+
+ trans_cnt = xspi->rx_bytes - xspi->tx_bytes;
+
+ /* Read out the data from the RX FIFO */
+ while (trans_cnt) {
+ u8 data;
+
+ data = cdns_spi_read(xspi, CDNS_SPI_RXD_OFFSET);
+ if (xspi->rxbuf)
+ *xspi->rxbuf++ = data;
+
+ xspi->rx_bytes--;
+ trans_cnt--;
+ }
+
+ if (xspi->tx_bytes) {
+ /* There is more data to send */
+ cdns_spi_fill_tx_fifo(xspi);
+ } else {
+ /* Transfer is completed */
+ cdns_spi_write(xspi, CDNS_SPI_IDR_OFFSET,
+ CDNS_SPI_IXR_DEFAULT_MASK);
+ spi_finalize_current_transfer(master);
+ }
+ status = IRQ_HANDLED;
+ }
+
+ return status;
+}
+
+/**
+ * cdns_transfer_one - Initiates the SPI transfer
+ * @master: Pointer to spi_master structure
+ * @spi: Pointer to the spi_device structure
+ * @transfer: Pointer to the spi_transfer structure which provides
+ * information about next transfer parameters
+ *
+ * This function fills the TX FIFO, starts the SPI transfer and
+ * returns a positive transfer count so that core will wait for completion.
+ *
+ * Return: Number of bytes transferred in the last transfer
+ */
+static int cdns_transfer_one(struct spi_master *master,
+ struct spi_device *spi,
+ struct spi_transfer *transfer)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ xspi->txbuf = transfer->tx_buf;
+ xspi->rxbuf = transfer->rx_buf;
+ xspi->tx_bytes = transfer->len;
+ xspi->rx_bytes = transfer->len;
+
+ cdns_spi_setup_transfer(spi, transfer);
+
+ cdns_spi_fill_tx_fifo(xspi);
+
+ cdns_spi_write(xspi, CDNS_SPI_IER_OFFSET,
+ CDNS_SPI_IXR_DEFAULT_MASK);
+ return transfer->len;
+}
+
+/**
+ * cdns_prepare_transfer_hardware - Prepares hardware for transfer.
+ * @master: Pointer to the spi_master structure which provides
+ * information about the controller.
+ *
+ * This function enables SPI master controller.
+ *
+ * Return: 0 always
+ */
+static int cdns_prepare_transfer_hardware(struct spi_master *master)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ cdns_spi_config_clock_mode(master->cur_msg->spi);
+
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_ENABLE_MASK);
+
+ return 0;
+}
+
+/**
+ * cdns_unprepare_transfer_hardware - Relaxes hardware after transfer
+ * @master: Pointer to the spi_master structure which provides
+ * information about the controller.
+ *
+ * This function disables the SPI master controller.
+ *
+ * Return: 0 always
+ */
+static int cdns_unprepare_transfer_hardware(struct spi_master *master)
+{
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_DISABLE_MASK);
+
+ return 0;
+}
+
+/**
+ * cdns_spi_probe - Probe method for the SPI driver
+ * @pdev: Pointer to the platform_device structure
+ *
+ * This function initializes the driver data structures and the hardware.
+ *
+ * Return: 0 on success and error value on error
+ */
+static int cdns_spi_probe(struct platform_device *pdev)
+{
+ int ret = 0, irq;
+ struct spi_master *master;
+ struct cdns_spi *xspi;
+ struct resource *res;
+ u32 num_cs;
+
+ master = spi_alloc_master(&pdev->dev, sizeof(*xspi));
+ if (master == NULL)
+ return -ENOMEM;
+
+ xspi = spi_master_get_devdata(master);
+ master->dev.of_node = pdev->dev.of_node;
+ platform_set_drvdata(pdev, master);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ xspi->regs = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(xspi->regs)) {
+ ret = PTR_ERR(xspi->regs);
+ goto remove_master;
+ }
+
+ xspi->pclk = devm_clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(xspi->pclk)) {
+ dev_err(&pdev->dev, "pclk clock not found.\n");
+ ret = PTR_ERR(xspi->pclk);
+ goto remove_master;
+ }
+
+ xspi->ref_clk = devm_clk_get(&pdev->dev, "ref_clk");
+ if (IS_ERR(xspi->ref_clk)) {
+ dev_err(&pdev->dev, "ref_clk clock not found.\n");
+ ret = PTR_ERR(xspi->ref_clk);
+ goto remove_master;
+ }
+
+ ret = clk_prepare_enable(xspi->pclk);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to enable APB clock.\n");
+ goto remove_master;
+ }
+
+ ret = clk_prepare_enable(xspi->ref_clk);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to enable device clock.\n");
+ goto clk_dis_apb;
+ }
+
+ /* SPI controller initializations */
+ cdns_spi_init_hw(xspi);
+
+ irq = platform_get_irq(pdev, 0);
+ if (irq <= 0) {
+ ret = -ENXIO;
+ dev_err(&pdev->dev, "irq number is invalid\n");
+ goto remove_master;
+ }
+
+ ret = devm_request_irq(&pdev->dev, irq, cdns_spi_irq,
+ 0, pdev->name, master);
+ if (ret != 0) {
+ ret = -ENXIO;
+ dev_err(&pdev->dev, "request_irq failed\n");
+ goto remove_master;
+ }
+
+ ret = of_property_read_u32(pdev->dev.of_node, "num-cs", &num_cs);
+
+ if (ret < 0)
+ master->num_chipselect = CDNS_SPI_DEFAULT_NUM_CS;
+ else
+ master->num_chipselect = num_cs;
+
+ ret = of_property_read_u32(pdev->dev.of_node, "is-decoded-cs",
+ &xspi->is_decoded_cs);
+
+ if (ret < 0)
+ xspi->is_decoded_cs = 0;
+
+ master->prepare_transfer_hardware = cdns_prepare_transfer_hardware;
+ master->transfer_one = cdns_transfer_one;
+ master->unprepare_transfer_hardware = cdns_unprepare_transfer_hardware;
+ master->set_cs = cdns_spi_chipselect;
+ master->mode_bits = SPI_CPOL | SPI_CPHA;
+
+ /* Set to default valid value */
+ master->max_speed_hz = clk_get_rate(xspi->ref_clk) / 4;
+ xspi->speed_hz = master->max_speed_hz;
+
+ master->bits_per_word_mask = SPI_BPW_MASK(8);
+
+ ret = spi_register_master(master);
+ if (ret) {
+ dev_err(&pdev->dev, "spi_register_master failed\n");
+ goto clk_dis_all;
+ }
+
+ return ret;
+
+clk_dis_all:
+ clk_disable_unprepare(xspi->ref_clk);
+clk_dis_apb:
+ clk_disable_unprepare(xspi->pclk);
+remove_master:
+ spi_master_put(master);
+ return ret;
+}
+
+/**
+ * cdns_spi_remove - Remove method for the SPI driver
+ * @pdev: Pointer to the platform_device structure
+ *
+ * This function is called if a device is physically removed from the system or
+ * if the driver module is being unloaded. It frees all resources allocated to
+ * the device.
+ *
+ * Return: 0 on success and error value on error
+ */
+static int cdns_spi_remove(struct platform_device *pdev)
+{
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ cdns_spi_write(xspi, CDNS_SPI_ER_OFFSET,
+ CDNS_SPI_ER_DISABLE_MASK);
+
+ clk_disable_unprepare(xspi->ref_clk);
+ clk_disable_unprepare(xspi->pclk);
+
+ spi_unregister_master(master);
+
+ return 0;
+}
+
+/**
+ * cdns_spi_suspend - Suspend method for the SPI driver
+ * @dev: Address of the platform_device structure
+ *
+ * This function disables the SPI controller and
+ * changes the driver state to "suspend"
+ *
+ * Return: Always 0
+ */
+static int __maybe_unused cdns_spi_suspend(struct device *dev)
+{
+ struct platform_device *pdev = container_of(dev,
+ struct platform_device, dev);
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+
+ spi_master_suspend(master);
+
+ clk_disable_unprepare(xspi->ref_clk);
+
+ clk_disable_unprepare(xspi->pclk);
+
+ return 0;
+}
+
+/**
+ * cdns_spi_resume - Resume method for the SPI driver
+ * @dev: Address of the platform_device structure
+ *
+ * This function changes the driver state to "ready"
+ *
+ * Return: 0 on success and error value on error
+ */
+static int __maybe_unused cdns_spi_resume(struct device *dev)
+{
+ struct platform_device *pdev = container_of(dev,
+ struct platform_device, dev);
+ struct spi_master *master = platform_get_drvdata(pdev);
+ struct cdns_spi *xspi = spi_master_get_devdata(master);
+ int ret = 0;
+
+ ret = clk_prepare_enable(xspi->pclk);
+ if (ret) {
+ dev_err(dev, "Cannot enable APB clock.\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(xspi->ref_clk);
+ if (ret) {
+ dev_err(dev, "Cannot enable device clock.\n");
+ clk_disable(xspi->pclk);
+ return ret;
+ }
+ spi_master_resume(master);
+
+ return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(cdns_spi_dev_pm_ops, cdns_spi_suspend,
+ cdns_spi_resume);
+
+static struct of_device_id cdns_spi_of_match[] = {
+ { .compatible = "xlnx,zynq-spi-r1p6" },
+ { .compatible = "cdns,spi-r1p6" },
+ { /* end of table */ }
+};
+MODULE_DEVICE_TABLE(of, cdns_spi_of_match);
+
+/* cdns_spi_driver - This structure defines the SPI subsystem platform driver */
+static struct platform_driver cdns_spi_driver = {
+ .probe = cdns_spi_probe,
+ .remove = cdns_spi_remove,
+ .driver = {
+ .name = CDNS_SPI_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = cdns_spi_of_match,
+ .pm = &cdns_spi_dev_pm_ops,
+ },
+};
+
+module_platform_driver(cdns_spi_driver);
+
+MODULE_AUTHOR("Xilinx, Inc.");
+MODULE_DESCRIPTION("Cadence SPI driver");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-06 02:52:52 +0300