510 lines
13 KiB
Diff
510 lines
13 KiB
Diff
--- a/drivers/spi/Kconfig
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+++ b/drivers/spi/Kconfig
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@@ -117,6 +117,13 @@ config SPI_BUTTERFLY
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inexpensive battery powered microcontroller evaluation board.
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This same cable can be used to flash new firmware.
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+config SPI_CNS3XXX
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+ tristate "CNS3XXX SPI controller"
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+ depends on ARCH_CNS3XXX && SPI_MASTER
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+ select SPI_BITBANG
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+ help
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+ This enables using the CNS3XXX SPI controller in master mode.
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+
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config SPI_COLDFIRE_QSPI
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tristate "Freescale Coldfire QSPI controller"
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depends on (M520x || M523x || M5249 || M527x || M528x || M532x)
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--- a/drivers/spi/Makefile
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+++ b/drivers/spi/Makefile
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@@ -18,6 +18,7 @@ obj-$(CONFIG_SPI_BFIN) += spi-bfin5xx.
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obj-$(CONFIG_SPI_BFIN_SPORT) += spi-bfin-sport.o
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obj-$(CONFIG_SPI_BITBANG) += spi-bitbang.o
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obj-$(CONFIG_SPI_BUTTERFLY) += spi-butterfly.o
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+obj-$(CONFIG_SPI_CNS3XXX) += spi_cns3xxx.o
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obj-$(CONFIG_SPI_COLDFIRE_QSPI) += spi-coldfire-qspi.o
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obj-$(CONFIG_SPI_DAVINCI) += spi-davinci.o
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obj-$(CONFIG_SPI_DESIGNWARE) += spi-dw.o
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--- /dev/null
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+++ b/drivers/spi/spi_cns3xxx.c
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@@ -0,0 +1,449 @@
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+/*******************************************************************************
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+ *
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+ * CNS3XXX SPI controller driver (master mode only)
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+ *
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+ * Copyright (c) 2008 Cavium Networks
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+ * Copyright 2011 Gateworks Corporation
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+ * Chris Lang <clang@gateworks.com>
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+ *
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+ * This file is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License, Version 2, as
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+ * published by the Free Software Foundation.
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+ *
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+ * This file is distributed in the hope that it will be useful,
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+ * but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
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+ * NONINFRINGEMENT. See the GNU General Public License for more details.
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+ *
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+ * You should have received a copy of the GNU General Public License
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+ * along with this file; if not, write to the Free Software
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+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
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+ * visit http://www.gnu.org/licenses/.
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+ *
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+ * This file may also be available under a different license from Cavium.
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+ * Contact Cavium Networks for more information
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+ *
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+ ******************************************************************************/
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+
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+#include <linux/init.h>
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+#include <linux/spinlock.h>
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+#include <linux/workqueue.h>
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+#include <linux/interrupt.h>
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+#include <linux/delay.h>
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+#include <linux/errno.h>
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+#include <linux/err.h>
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+#include <linux/clk.h>
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+#include <linux/platform_device.h>
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+
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+#include <linux/spi/spi.h>
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+#include <linux/spi/spi_bitbang.h>
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+#include <linux/mtd/partitions.h>
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+#include <linux/dma-mapping.h>
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+#include <linux/slab.h>
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+
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+#include <asm/io.h>
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+#include <asm/memory.h>
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+#include <asm/dma.h>
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+#include <asm/delay.h>
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+#include <mach/cns3xxx.h>
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+#include <linux/module.h>
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+#include <mach/pm.h>
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+
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+/*
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+ * define access macros
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+ */
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+#define SPI_MEM_MAP_VALUE(reg_offset) (*((u32 volatile *)(CNS3XXX_SSP_BASE_VIRT + reg_offset)))
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+
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+#define SPI_CONFIGURATION_REG SPI_MEM_MAP_VALUE(0x40)
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+#define SPI_SERVICE_STATUS_REG SPI_MEM_MAP_VALUE(0x44)
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+#define SPI_BIT_RATE_CONTROL_REG SPI_MEM_MAP_VALUE(0x48)
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+#define SPI_TRANSMIT_CONTROL_REG SPI_MEM_MAP_VALUE(0x4C)
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+#define SPI_TRANSMIT_BUFFER_REG SPI_MEM_MAP_VALUE(0x50)
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+#define SPI_RECEIVE_CONTROL_REG SPI_MEM_MAP_VALUE(0x54)
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+#define SPI_RECEIVE_BUFFER_REG SPI_MEM_MAP_VALUE(0x58)
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+#define SPI_FIFO_TRANSMIT_CONFIG_REG SPI_MEM_MAP_VALUE(0x5C)
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+#define SPI_FIFO_TRANSMIT_CONTROL_REG SPI_MEM_MAP_VALUE(0x60)
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+#define SPI_FIFO_RECEIVE_CONFIG_REG SPI_MEM_MAP_VALUE(0x64)
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+#define SPI_INTERRUPT_STATUS_REG SPI_MEM_MAP_VALUE(0x68)
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+#define SPI_INTERRUPT_ENABLE_REG SPI_MEM_MAP_VALUE(0x6C)
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+
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+#define SPI_TRANSMIT_BUFFER_REG_ADDR (CNS3XXX_SSP_BASE +0x50)
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+#define SPI_RECEIVE_BUFFER_REG_ADDR (CNS3XXX_SSP_BASE +0x58)
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+
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+/* Structure for SPI controller of CNS3XXX SOCs */
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+struct cns3xxx_spi {
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+ /* bitbang has to be first */
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+ struct spi_bitbang bitbang;
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+ struct completion done;
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+ wait_queue_head_t wait;
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+
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+ int len;
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+ int count;
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+ int last_in_message_list;
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+
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+ /* data buffers */
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+ const unsigned char *tx;
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+ unsigned char *rx;
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+
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+ struct spi_master *master;
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+ struct platform_device *pdev;
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+ struct device *dev;
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+};
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+
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+static inline u8 cns3xxx_spi_bus_idle(void)
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+{
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+ return ((SPI_SERVICE_STATUS_REG & 0x1) ? 0 : 1);
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+}
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+
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+static inline u8 cns3xxx_spi_tx_buffer_empty(void)
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+{
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+ return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 3)) ? 1 : 0);
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+}
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+
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+static inline u8 cns3xxx_spi_rx_buffer_full(void)
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+{
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+ return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 2)) ? 1 : 0);
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+}
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+
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+u8 cns3xxx_spi_tx_rx(u8 tx_channel, u8 tx_eof, u32 tx_data,
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+ u32 * rx_data)
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+{
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+ u8 rx_channel;
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+ u8 rx_eof;
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+
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+ while (!cns3xxx_spi_bus_idle()) ; // do nothing
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+
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+ while (!cns3xxx_spi_tx_buffer_empty()) ; // do nothing
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+
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+ SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
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+ SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
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+
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+ SPI_TRANSMIT_BUFFER_REG = tx_data;
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+
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+ while (!cns3xxx_spi_rx_buffer_full()) ; // do nothing
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+
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+ rx_channel = SPI_RECEIVE_CONTROL_REG & 0x3;
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+ rx_eof = (SPI_RECEIVE_CONTROL_REG & (0x1 << 2)) ? 1 : 0;
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+
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+ *rx_data = SPI_RECEIVE_BUFFER_REG;
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+
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+ if ((tx_channel != rx_channel) || (tx_eof != rx_eof)) {
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+ return 0;
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+ } else {
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+ return 1;
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+ }
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+}
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+
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+u8 cns3xxx_spi_tx(u8 tx_channel, u8 tx_eof, u32 tx_data)
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+{
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+
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+ while (!cns3xxx_spi_bus_idle()) ; // do nothing
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+
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+ while (!cns3xxx_spi_tx_buffer_empty()) ; // do nothing
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+
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+ SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
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+ SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
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+
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+ SPI_TRANSMIT_BUFFER_REG = tx_data;
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+
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+ return 1;
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+}
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+
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+static inline struct cns3xxx_spi *to_hw(struct spi_device *sdev)
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+{
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+ return spi_master_get_devdata(sdev->master);
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+}
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+
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+static int cns3xxx_spi_setup_transfer(struct spi_device *spi,
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+ struct spi_transfer *t)
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+{
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+ return 0;
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+}
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+
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+static void cns3xxx_spi_chipselect(struct spi_device *spi, int value)
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+{
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+ unsigned int spi_config;
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+
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+ switch (value) {
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+ case BITBANG_CS_INACTIVE:
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+ break;
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+
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+ case BITBANG_CS_ACTIVE:
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+ spi_config = SPI_CONFIGURATION_REG;
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+
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+ if (spi->mode & SPI_CPHA)
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+ spi_config |= (0x1 << 13);
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+ else
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+ spi_config &= ~(0x1 << 13);
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+
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+ if (spi->mode & SPI_CPOL)
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+ spi_config |= (0x1 << 14);
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+ else
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+ spi_config &= ~(0x1 << 14);
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+
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+ /* write new configration */
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+ SPI_CONFIGURATION_REG = spi_config;
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+
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+ SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
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+ SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3);
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+
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+ break;
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+ }
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+}
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+
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+static int cns3xxx_spi_setup(struct spi_device *spi)
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+{
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+ if (!spi->bits_per_word)
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+ spi->bits_per_word = 8;
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+
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+ return 0;
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+}
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+
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+static int cns3xxx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
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+{
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+ struct cns3xxx_spi *hw = to_hw(spi);
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+
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+ dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf,
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+ t->len);
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+
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+ hw->tx = t->tx_buf;
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+ hw->rx = t->rx_buf;
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+ hw->len = t->len;
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+ hw->count = 0;
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+ hw->last_in_message_list = t->last_in_message_list;
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+
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+ init_completion(&hw->done);
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+
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+ if (hw->tx) {
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+ int i;
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+ u32 rx_data;
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+ for (i = 0; i < (hw->len - 1); i++) {
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+ dev_dbg(&spi->dev,
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+ "[SPI_CNS3XXX_DEBUG] hw->tx[%02d]: 0x%02x\n", i,
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+ hw->tx[i]);
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+ cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
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+ &rx_data);
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+ if (hw->rx) {
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+ hw->rx[i] = rx_data;
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+ dev_dbg(&spi->dev,
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+ "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
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+ i, hw->rx[i]);
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+ }
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+ }
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+
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+ if (t->last_in_message_list) {
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+ cns3xxx_spi_tx_rx(spi->chip_select, 1, hw->tx[i],
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+ &rx_data);
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+ if (hw->rx) {
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+ hw->rx[i] = rx_data;
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+ dev_dbg(&spi->dev,
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+ "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
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+ i, hw->rx[i]);
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+ }
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+ } else {
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+ cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
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+ &rx_data);
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+ }
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+ goto done;
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+ }
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+
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+ if (hw->rx) {
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+ int i;
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+ u32 rx_data;
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+ for (i = 0; i < (hw->len - 1); i++) {
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+ cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
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+ hw->rx[i] = rx_data;
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+ dev_dbg(&spi->dev,
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+ "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", i,
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+ hw->rx[i]);
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+ }
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+
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+ if (t->last_in_message_list) {
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+ cns3xxx_spi_tx_rx(spi->chip_select, 1, 0xff, &rx_data);
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+ } else {
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+ cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
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+ }
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+ hw->rx[i] = rx_data;
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+ dev_dbg(&spi->dev, "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
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+ i, hw->rx[i]);
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+ }
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+done:
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+ return hw->len;
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+}
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+
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+static void __init cns3xxx_spi_initial(void)
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+{
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+ u32 __iomem *gpiob = __io(CNS3XXX_MISC_BASE_VIRT + 0x0018);
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+ u32 gpiob_pins = __raw_readl(gpiob);
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+
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+ /* MMC/SD pins share with GPIOA */
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+ gpiob_pins |= 0xf80;
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+ __raw_writel(gpiob_pins, gpiob);
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+
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+ /* share pin config. */
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+ //PM_PLL_HM_PD_CTRL_REG &= ~(0x1 << 5);
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+ //HAL_MISC_ENABLE_SPI_PINS();
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+ cns3xxx_pwr_clk_en(CNS3XXX_PWR_CLK_EN(SPI_PCM_I2C));
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+ cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SPI_PCM_I2C));
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+
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+ SPI_CONFIGURATION_REG = (((0x0 & 0x3) << 0) | /* 8bits shift length */
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+ (0x0 << 9) | /* SPI mode */
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+ (0x0 << 10) | /* disable FIFO */
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+ (0x1 << 11) | /* SPI master mode */
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+ (0x0 << 12) | /* disable SPI loopback mode */
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+ (0x1 << 13) | /* clock phase */
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+ (0x1 << 14) | /* clock polarity */
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+ (0x0 << 24) | /* disable - SPI data swap */
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+ (0x1 << 29) | /* enable - 2IO Read mode */
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+ (0x0 << 30) | /* disable - SPI high speed read for system boot up */
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+ (0x0 << 31)); /* disable - SPI */
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+
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+ /* Set SPI bit rate PCLK/2 */
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+ SPI_BIT_RATE_CONTROL_REG = 0x1;
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+
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+ /* Set SPI Tx channel 0 */
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+ SPI_TRANSMIT_CONTROL_REG = 0x0;
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+
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+ /* Set Tx FIFO Threshold, Tx FIFO has 2 words */
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+ SPI_FIFO_TRANSMIT_CONFIG_REG &= ~(0x03 << 4);
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+ SPI_FIFO_TRANSMIT_CONFIG_REG |= ((0x0 & 0x03) << 4);
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+
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+ /* Set Rx FIFO Threshold, Rx FIFO has 2 words */
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+ SPI_FIFO_RECEIVE_CONFIG_REG &= ~(0x03 << 4);
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+ SPI_FIFO_RECEIVE_CONFIG_REG |= ((0x0 & 0x03) << 4);
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+
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+ /* Disable all interrupt */
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+ SPI_INTERRUPT_ENABLE_REG = 0x0;
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+
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+ /* Clear spurious interrupt sources */
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+ SPI_INTERRUPT_STATUS_REG = (0x0F << 4);
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+
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+ /* Enable SPI */
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+ SPI_CONFIGURATION_REG |= (0x1 << 31);
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+
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+ return;
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+}
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+
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+static int __devinit cns3xxx_spi_probe(struct platform_device *pdev)
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+{
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+ struct spi_master *master;
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+ struct cns3xxx_spi *hw;
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+ int err = 0;
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+
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+ printk("%s: setup CNS3XXX SPI Controller\n", __FUNCTION__);
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+
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+ /* Allocate master with space for cns3xxx_spi */
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+ master = spi_alloc_master(&pdev->dev, sizeof(struct cns3xxx_spi));
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+ if (master == NULL) {
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+ dev_err(&pdev->dev, "No memory for spi_master\n");
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+ err = -ENOMEM;
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+ goto err_nomem;
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+ }
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+
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+ hw = spi_master_get_devdata(master);
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+ memset(hw, 0, sizeof(struct cns3xxx_spi));
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+
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+ hw->master = spi_master_get(master);
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+ hw->dev = &pdev->dev;
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+
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+ platform_set_drvdata(pdev, hw);
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+ init_completion(&hw->done);
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+
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+ /* setup the master state. */
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+
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+ master->num_chipselect = 4;
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+ master->bus_num = 1;
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+
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+ /* setup the state for the bitbang driver */
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+
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+ hw->bitbang.master = hw->master;
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+ hw->bitbang.setup_transfer = cns3xxx_spi_setup_transfer;
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+ hw->bitbang.chipselect = cns3xxx_spi_chipselect;
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+ hw->bitbang.txrx_bufs = cns3xxx_spi_txrx;
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+ hw->bitbang.master->setup = cns3xxx_spi_setup;
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+
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+ dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
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+
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+ /* SPI controller initializations */
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+ cns3xxx_spi_initial();
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+
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+ /* register SPI controller */
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+
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+ err = spi_bitbang_start(&hw->bitbang);
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+ if (err) {
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+ dev_err(&pdev->dev, "Failed to register SPI master\n");
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+ goto err_register;
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+ }
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+
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+ return 0;
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+
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+err_register:
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+ spi_master_put(hw->master);;
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+
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+err_nomem:
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+ return err;
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+}
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+
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+static int __devexit cns3xxx_spi_remove(struct platform_device *dev)
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+{
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+ struct cns3xxx_spi *hw = platform_get_drvdata(dev);
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+
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+ platform_set_drvdata(dev, NULL);
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+
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+ spi_unregister_master(hw->master);
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+
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+ spi_master_put(hw->master);
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+ return 0;
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+}
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+
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+#ifdef CONFIG_PM
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+
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+static int cns3xxx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
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+{
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+ struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
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+
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+ return 0;
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+}
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+
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+static int cns3xxx_spi_resume(struct platform_device *pdev)
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+{
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+ struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
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+
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+ return 0;
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+}
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+
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+#else
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+#define cns3xxx_spi_suspend NULL
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+#define cns3xxx_spi_resume NULL
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+#endif
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+
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+static struct platform_driver cns3xxx_spi_driver = {
|
|
+ .probe = cns3xxx_spi_probe,
|
|
+ .remove = __devexit_p(cns3xxx_spi_remove),
|
|
+ .suspend = cns3xxx_spi_suspend,
|
|
+ .resume = cns3xxx_spi_resume,
|
|
+ .driver = {
|
|
+ .name = "cns3xxx_spi",
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+};
|
|
+
|
|
+static int __init cns3xxx_spi_init(void)
|
|
+{
|
|
+ return platform_driver_register(&cns3xxx_spi_driver);
|
|
+}
|
|
+
|
|
+static void __exit cns3xxx_spi_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&cns3xxx_spi_driver);
|
|
+}
|
|
+
|
|
+module_init(cns3xxx_spi_init);
|
|
+module_exit(cns3xxx_spi_exit);
|
|
+
|
|
+MODULE_AUTHOR("Cavium Networks");
|
|
+MODULE_DESCRIPTION("CNS3XXX SPI Controller Driver");
|
|
+MODULE_LICENSE("GPL");
|
|
+MODULE_ALIAS("platform:cns3xxx_spi");
|
|
+
|
|
+EXPORT_SYMBOL_GPL(cns3xxx_spi_tx_rx);
|
|
--- a/include/linux/spi/spi.h
|
|
+++ b/include/linux/spi/spi.h
|
|
@@ -508,6 +508,13 @@ struct spi_transfer {
|
|
u32 speed_hz;
|
|
|
|
struct list_head transfer_list;
|
|
+
|
|
+#ifdef CONFIG_ARCH_CNS3XXX
|
|
+ unsigned last_in_message_list;
|
|
+#ifdef CONFIG_SPI_CNS3XXX_2IOREAD
|
|
+ u8 dio_read;
|
|
+#endif
|
|
+#endif
|
|
};
|
|
|
|
/**
|
|
--- a/drivers/spi/spi-bitbang.c
|
|
+++ b/drivers/spi/spi-bitbang.c
|
|
@@ -330,6 +330,12 @@ static void bitbang_work(struct work_str
|
|
*/
|
|
if (!m->is_dma_mapped)
|
|
t->rx_dma = t->tx_dma = 0;
|
|
+
|
|
+ if (t->transfer_list.next == &m->transfers)
|
|
+ t->last_in_message_list = 1;
|
|
+ else
|
|
+ t->last_in_message_list = 0;
|
|
+
|
|
status = bitbang->txrx_bufs(spi, t);
|
|
}
|
|
if (status > 0)
|