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openwrt-owl/target/linux/cns3xxx/patches-2.6.31/207-cns3xxx_spi_support.patch

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add support for the Gateworks Laguna family (Cavium Networks Econa CNS3xxx) SVN-Revision: 22323
2010-07-21 11:20:53 +00:00
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -236,6 +236,39 @@ config SPI_XILINX
See the "OPB Serial Peripheral Interface (SPI) (v1.00e)"
Product Specification document (DS464) for hardware details.
+config SPI_CNS3XXX
+ tristate "CNS3XXX SPI controller"
+ depends on ARCH_CNS3XXX && SPI_MASTER && EXPERIMENTAL
+ select SPI_BITBANG
+ help
+ This enables using the CNS3XXX SPI controller in master
+ mode.
+
+config SPI_CNS3XXX_DEBUG
+ boolean "Debug support for CNS3XXX SPI drivers"
+ depends on SPI_CNS3XXX
+ help
+ Say "yes" to enable debug messaging
+
+config SPI_CNS3XXX_2IOREAD
+ bool "CNS3XXX SPI 2 IO Read Mode"
+ depends on SPI_CNS3XXX
+ help
+ This enables 2 IO Read Mode
+
+config SPI_CNS3XXX_USEDMA
+ bool "CNS3XXX SPI DMA Mode"
+ depends on SPI_CNS3XXX
+ select CNS3XXX_DMAC
+ help
+ This enables DMA Mode
+
+config SPI_CNS3XXX_USEDMA_DEBUG
+ boolean "Debug support for CNS3XXX SPI DMA drivers"
+ depends on SPI_CNS3XXX_USEDMA
+ help
+ Say "yes" to enable debug messaging
+
#
# Add new SPI master controllers in alphabetical order above this line
#
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_SPI_S3C24XX) += spi_s3c24x
obj-$(CONFIG_SPI_TXX9) += spi_txx9.o
obj-$(CONFIG_SPI_XILINX) += xilinx_spi.o
obj-$(CONFIG_SPI_SH_SCI) += spi_sh_sci.o
+obj-$(CONFIG_SPI_CNS3XXX) += spi_cns3xxx.o
# ... add above this line ...
# SPI protocol drivers (device/link on bus)
--- a/drivers/spi/spi_bitbang.c
+++ b/drivers/spi/spi_bitbang.c
@@ -334,6 +334,14 @@ static void bitbang_work(struct work_str
*/
if (!m->is_dma_mapped)
t->rx_dma = t->tx_dma = 0;
+
+#ifdef CONFIG_ARCH_CNS3XXX
+ if (t->transfer_list.next == &m->transfers) {
+ t->last_in_message_list = 1;
+ } else {
+ t->last_in_message_list = 0;
+ }
+#endif
status = bitbang->txrx_bufs(spi, t);
}
if (status > 0)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -769,6 +769,89 @@ int spi_write_then_read(struct spi_devic
}
EXPORT_SYMBOL_GPL(spi_write_then_read);
+#ifdef CONFIG_ARCH_CNS3XXX
+/**
+ * spi_write_read_sync - SPI synchronous write & read
+ * @spi: device with which data will be exchanged
+ * @txbuf: data to be written (need not be dma-safe)
+ * @n_tx: size of txbuf, in bytes
+ * @rxbuf: buffer into which data will be read
+ * @n_rx: size of rxbuf, in bytes (need not be dma-safe)
+ *
+ * This performs a half duplex MicroWire style transaction with the
+ * device, sending txbuf and then reading rxbuf. The return value
+ * is zero for success, else a negative errno status code.
+ * This call may only be used from a context that may sleep.
+ *
+ * Parameters to this routine are always copied using a small buffer;
+ * performance-sensitive or bulk transfer code should instead use
+ * spi_{async,sync}() calls with dma-safe buffers.
+ */
+int spi_write_read_sync(struct spi_device *spi,
+ const u8 *txbuf, unsigned n_tx,
+ u8 *rxbuf, unsigned n_rx)
+{
+ static DECLARE_MUTEX(lock);
+
+ int status;
+ struct spi_message message;
+ struct spi_transfer x;
+ u8 *local_buf;
+
+ /* Use preallocated DMA-safe buffer. We can't avoid copying here,
+ * (as a pure convenience thing), but we can keep heap costs
+ * out of the hot path ...
+ */
+#if 0
+ while (!str8131_spi_bus_idle()){
+ printk("spi bus is not idle \n"); // do nothing
+ }
+ while (!str8131_spi_tx_buffer_empty()){
+ printk("spi tx buffer is not empty \n"); // do nothing
+ }
+#endif
+ if ((n_tx + n_rx) > SPI_BUFSIZ)
+ return -EINVAL;
+ spi_message_init(&message);
+ memset(&x, 0, sizeof x);
+ x.len = n_tx;
+ spi_message_add_tail(&x, &message);
+
+ /* ... unless someone else is using the pre-allocated buffer */
+ if (down_trylock(&lock)) {
+ local_buf = kmalloc(SPI_BUFSIZ, GFP_KERNEL);
+ if (!local_buf)
+ return -ENOMEM;
+ } else
+ local_buf = buf;
+
+ memcpy(local_buf, txbuf, n_tx);
+ x.tx_buf = local_buf;
+ x.rx_buf = local_buf + n_tx;
+
+ /* do the i/o */
+ status = spi_sync(spi, &message);
+ if (status == 0) {
+ memcpy(rxbuf, x.rx_buf, n_rx);
+ status = message.status;
+ }
+
+ if (x.tx_buf == buf)
+ up(&lock);
+ else
+ kfree(local_buf);
+
+ return status;
+}
+
+EXPORT_SYMBOL_GPL(spi_write_read_sync);
+#endif /* CONFIG_ARCH_CNS3XXX */
+
+
+
+
+
+
/*-------------------------------------------------------------------------*/
static int __init spi_init(void)
--- /dev/null
+++ b/drivers/spi/spi_cns3xxx.c
@@ -0,0 +1,878 @@
+/*******************************************************************************
+ *
+ * CNS3XXX SPI controller driver (master mode only)
+ *
+ * Copyright (c) 2008 Cavium Networks
+ *
+ * This file 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.
+ *
+ * This file is distributed in the hope that it will be useful,
+ * but AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT. See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA or
+ * visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium Networks for more information
+ *
+ ******************************************************************************/
+
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/interrupt.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+#include <linux/mtd/partitions.h>
+#include <linux/dma-mapping.h>
+
+#include <asm/io.h>
+#include <asm/memory.h>
+#include <asm/dma.h>
+#include <asm/delay.h>
+#include <mach/board.h>
+#include <mach/dmac.h>
+#include <linux/module.h>
+#include <mach/misc.h>
+#include <mach/gpio.h>
+#include <mach/pm.h>
+
+#define LE8221_SPI_CS 1
+#define SI3226_SPI_CS 1
+
+#define CNS3XXX_SPI_INTERRUPT
+#undef CNS3XXX_SPI_INTERRUPT /* Interrupt is not supported for D2 and SEN */
+
+/*
+ * define access macros
+ */
+#define SPI_MEM_MAP_VALUE(reg_offset) (*((u32 volatile *)(CNS3XXX_SSP_BASE_VIRT + reg_offset)))
+
+#define SPI_CONFIGURATION_REG SPI_MEM_MAP_VALUE(0x40)
+#define SPI_SERVICE_STATUS_REG SPI_MEM_MAP_VALUE(0x44)
+#define SPI_BIT_RATE_CONTROL_REG SPI_MEM_MAP_VALUE(0x48)
+#define SPI_TRANSMIT_CONTROL_REG SPI_MEM_MAP_VALUE(0x4C)
+#define SPI_TRANSMIT_BUFFER_REG SPI_MEM_MAP_VALUE(0x50)
+#define SPI_RECEIVE_CONTROL_REG SPI_MEM_MAP_VALUE(0x54)
+#define SPI_RECEIVE_BUFFER_REG SPI_MEM_MAP_VALUE(0x58)
+#define SPI_FIFO_TRANSMIT_CONFIG_REG SPI_MEM_MAP_VALUE(0x5C)
+#define SPI_FIFO_TRANSMIT_CONTROL_REG SPI_MEM_MAP_VALUE(0x60)
+#define SPI_FIFO_RECEIVE_CONFIG_REG SPI_MEM_MAP_VALUE(0x64)
+#define SPI_INTERRUPT_STATUS_REG SPI_MEM_MAP_VALUE(0x68)
+#define SPI_INTERRUPT_ENABLE_REG SPI_MEM_MAP_VALUE(0x6C)
+
+#define SPI_TRANSMIT_BUFFER_REG_ADDR (CNS3XXX_SSP_BASE +0x50)
+#define SPI_RECEIVE_BUFFER_REG_ADDR (CNS3XXX_SSP_BASE +0x58)
+
+/* Structure for SPI controller of CNS3XXX SOCs */
+struct cns3xxx_spi {
+ /* bitbang has to be first */
+ struct spi_bitbang bitbang;
+ struct completion done;
+ wait_queue_head_t wait;
+
+ int len;
+ int count;
+ int last_in_message_list;
+
+ /* data buffers */
+ const unsigned char *tx;
+ unsigned char *rx;
+
+ struct spi_master *master;
+ struct platform_device *pdev;
+ struct device *dev;
+};
+
+static inline u8 cns3xxx_spi_bus_idle(void)
+{
+ return ((SPI_SERVICE_STATUS_REG & 0x1) ? 0 : 1);
+}
+
+static inline u8 cns3xxx_spi_tx_buffer_empty(void)
+{
+ return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 3)) ? 1 : 0);
+}
+
+static inline u8 cns3xxx_spi_rx_buffer_full(void)
+{
+ return ((SPI_INTERRUPT_STATUS_REG & (0x1 << 2)) ? 1 : 0);
+}
+
+u8 cns3xxx_spi_tx_rx(u8 tx_channel, u8 tx_eof, u32 tx_data,
+ u32 * rx_data)
+{
+ u8 rx_channel;
+ u8 rx_eof;
+
+ while (!cns3xxx_spi_bus_idle()) ; // do nothing
+
+ while (!cns3xxx_spi_tx_buffer_empty()) ; // do nothing
+
+ SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
+ SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
+
+ SPI_TRANSMIT_BUFFER_REG = tx_data;
+
+ while (!cns3xxx_spi_rx_buffer_full()) ; // do nothing
+
+ rx_channel = SPI_RECEIVE_CONTROL_REG & 0x3;
+ rx_eof = (SPI_RECEIVE_CONTROL_REG & (0x1 << 2)) ? 1 : 0;
+
+ *rx_data = SPI_RECEIVE_BUFFER_REG;
+
+ if ((tx_channel != rx_channel) || (tx_eof != rx_eof)) {
+ return 0;
+ } else {
+ return 1;
+ }
+}
+
+u8 cns3xxx_spi_tx(u8 tx_channel, u8 tx_eof, u32 tx_data)
+{
+
+ while (!cns3xxx_spi_bus_idle()) ; // do nothing
+
+ while (!cns3xxx_spi_tx_buffer_empty()) ; // do nothing
+
+ SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
+ SPI_TRANSMIT_CONTROL_REG |= (tx_channel & 0x3) | ((tx_eof & 0x1) << 2);
+
+ SPI_TRANSMIT_BUFFER_REG = tx_data;
+
+ return 1;
+}
+
+
+
+#ifdef CONFIG_SPI_CNS3XXX_DEBUG
+static void spi_slave_probe(void)
+{
+ int i;
+ u32 rx_data1, rx_data2, rx_data3;
+
+ cns3xxx_spi_tx_rx(0, 0, 0x9f, &rx_data1);
+ cns3xxx_spi_tx_rx(0, 0, 0xff, &rx_data1);
+ cns3xxx_spi_tx_rx(0, 0, 0xff, &rx_data2);
+ cns3xxx_spi_tx_rx(0, 1, 0xff, &rx_data3);
+ printk("[SPI_CNS3XXX_DEBUG] manufacturer: %x\n", rx_data1);
+ printk("[SPI_CNS3XXX_DEBUG] device: %x\n",
+ ((rx_data2 & 0xff) << 8) | (u16) (rx_data3 & 0xff));
+
+ cns3xxx_spi_tx_rx(0, 0, 0x03, &rx_data1);
+ cns3xxx_spi_tx_rx(0, 0, 0x00, &rx_data1);
+ cns3xxx_spi_tx_rx(0, 0, 0x00, &rx_data1);
+ cns3xxx_spi_tx_rx(0, 0, 0x00, &rx_data1);
+ for (i = 0; i < 15; i++) {
+ cns3xxx_spi_tx_rx(0, 0, 0xff, &rx_data1);
+ printk("[SPI_CNS3XXX_DEBUG] flash[%02d]:0x%02x\n", i,
+ rx_data1 & 0xff);
+ }
+ cns3xxx_spi_tx_rx(0, 1, 0xff, &rx_data1);
+ printk("[SPI_CNS3XXX_DEBUG] flash[%02d]:0x%02x\n", i, rx_data1 & 0xff);
+}
+#else
+#define spi_slave_probe() do{}while(0)
+#endif
+
+static inline struct cns3xxx_spi *to_hw(struct spi_device *sdev)
+{
+ return spi_master_get_devdata(sdev->master);
+}
+
+static int cns3xxx_spi_setup_transfer(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ return 0;
+}
+
+static void cns3xxx_spi_chipselect(struct spi_device *spi, int value)
+{
+ unsigned int spi_config;
+
+ switch (value) {
+ case BITBANG_CS_INACTIVE:
+ break;
+
+ case BITBANG_CS_ACTIVE:
+ spi_config = SPI_CONFIGURATION_REG;
+
+ if (spi->mode & SPI_CPHA)
+ spi_config |= (0x1 << 13);
+ else
+ spi_config &= ~(0x1 << 13);
+
+ if (spi->mode & SPI_CPOL)
+ spi_config |= (0x1 << 14);
+ else
+ spi_config &= ~(0x1 << 14);
+
+ /* write new configration */
+ SPI_CONFIGURATION_REG = spi_config;
+
+ SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
+ SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3);
+
+#if defined(CONFIG_LE8221_CONTROL)
+ if (spi->chip_select == LE8221_SPI_CS) {
+ SPI_CONFIGURATION_REG |= (0x1 << 9);
+ }
+#elif defined (CONFIG_SI3226_CONTROL_API)
+ if (spi->chip_select == SI3226_SPI_CS) {
+ SPI_CONFIGURATION_REG &= ~(0x1 << 9);
+ }
+#endif
+ break;
+ }
+}
+
+static int cns3xxx_spi_setup(struct spi_device *spi)
+{
+ if (!spi->bits_per_word)
+ spi->bits_per_word = 8;
+
+ return 0;
+}
+
+#ifdef CONFIG_SPI_CNS3XXX_USEDMA
+
+int cns3xxx_spi_dma_irq_handler(void *pdata)
+{
+
+ struct cns3xxx_spi *hw = pdata;
+ complete(&hw->done);
+
+ return 0;
+}
+
+static int cns3xxx_spi_dma_initialize(int *rxchan, int *txchan, int *rxevtno,
+ int *txevtno, void *handlerargs)
+{
+ *rxchan = dmac_get_channel(cns3xxx_spi_dma_irq_handler, handlerargs);
+ if ((*rxchan) == -1)
+ goto fail1;
+ *txchan = dmac_get_channel(NULL, NULL);
+ if ((*txchan) == -1)
+ goto fail2;
+ *rxevtno = 9;
+ if (dmac_get_event(*rxchan, *rxevtno) == -1)
+ goto fail3;
+ *txevtno = 10;
+ if (dmac_get_event(*txchan, *txevtno) == -1)
+ goto fail4;
+ return 0;
+
+fail4:
+ dmac_release_event(*rxchan, *rxevtno);
+fail3:
+ dmac_release_channel(*txchan);
+fail2:
+ dmac_release_channel(*rxchan);
+fail1:
+ return -1;
+}
+
+static int cns3xxx_spi_start_dma(int rch, int tch, int rev, int tev,
+ struct spi_transfer *t, struct cns3xxx_spi *hw)
+{
+ static void *dummy;
+ static dma_addr_t dummy_dma;
+ dma_addr_t rdma, tdma;
+ int rx_inc, tx_inc;
+ int lc0, totlps, lc1, rump;
+ u32 rx_data;
+
+ if (!dummy) {
+ dummy = dma_alloc_coherent(NULL, 16, &dummy_dma, GFP_KERNEL);
+#ifdef CONFIG_SPI_CNS3XXX_DEBUG_DMA
+ printk("Allocated Memory for dummy buffer va:%p,pa:%x\n", dummy,
+ dummy_dma);
+#endif
+ }
+ if (!dummy) {
+ return -1;
+ }
+ *((uint32_t *) dummy) = 0xffffffff;
+
+ (t->tx_buf) ? (tdma = t->tx_dma, tx_inc = 1) :
+ (tdma = dummy_dma, tx_inc = 0);
+ (t->rx_buf) ? (rdma = t->rx_dma, rx_inc = 1) :
+ (rdma = dummy_dma, rx_inc = 0);
+
+#ifdef CONFIG_SPI_CNS3XXX_DEBUG_DMA
+ printk("Here with tdma %x, rdma %x\n", tdma, rdma);
+#endif
+
+ if(t->len < 3) {
+ if(t->len == 2){
+ cns3xxx_spi_tx_rx(0,0,(t->tx_buf) ? hw->tx[0] : 0xff ,&rx_data);
+ if(!(t->tx_buf))
+ hw->rx[0] = rx_data & 0xff;
+ }
+ cns3xxx_spi_dma_irq_handler(hw);
+ return 0;
+ }
+
+
+ totlps = t->len - 1 -1;
+ if (totlps > 0x100) {
+ lc0 = 0x100;
+ lc1 = totlps / lc0;
+ rump = totlps % lc0;
+ } else {
+ lc0 = totlps;
+ lc1 = 0;
+ rump = 0;
+ }
+
+ if(t->tx_buf) {
+ cns3xxx_spi_tx(0,0,*((uint32_t *) t->tx_buf));
+ tdma+=1;
+ }
+ else {
+ cns3xxx_spi_tx(0,0,0xff);
+ }
+
+ //SPI_RECEIVE_BUFFER_REG;
+ {
+ DMAC_DMAMOV(tch, SAR, tdma);
+ DMAC_DMAMOV(tch, DAR, SPI_TRANSMIT_BUFFER_REG_ADDR);
+ DMAC_DMAMOV(tch, CCR,
+ dmac_create_ctrlval(tx_inc, 1, 1, 0, 1, 1, 0));
+ //DMAC_WFE(tch, rev);
+ if (lc1)
+ DMAC_DMALP(tch, 1, lc1);
+ DMAC_DMALP(tch, 0, lc0);
+ DMAC_WFE(tch, rev);
+ DMAC_DMALDS(tch);
+ DMAC_DMASTS(tch);
+ DMAC_DMAWMB(tch);
+ DMAC_DMASEV(tch, tev);
+ DMAC_DMALPEND(tch, 0,
+ DMAWFE_INSTR_SIZE + DMASEV_INSTR_SIZE +
+ DMAWMB_INSTR_SIZE + DMAST_INSTR_SIZE +
+ DMALD_INSTR_SIZE, 1);
+ if (lc1)
+ DMAC_DMALPEND(tch, 1,
+ DMALP_INSTR_SIZE + DMALPEND_INSTR_SIZE +
+ DMAWFE_INSTR_SIZE + DMASEV_INSTR_SIZE +
+ DMAWMB_INSTR_SIZE + DMAST_INSTR_SIZE +
+ DMALD_INSTR_SIZE, 1);
+
+ if (rump) {
+ DMAC_DMALP(tch, 0, rump);
+ DMAC_WFE(tch, rev);
+ DMAC_DMALDS(tch);
+ DMAC_DMASTS(tch);
+ DMAC_DMAWMB(tch);
+ DMAC_DMASEV(tch, tev);
+ DMAC_DMALPEND(tch, 0,
+ DMAWFE_INSTR_SIZE + DMASEV_INSTR_SIZE +
+ DMAWMB_INSTR_SIZE + DMAST_INSTR_SIZE +
+ DMALD_INSTR_SIZE, 1);
+ }
+
+
+ DMAC_DMAEND(tch);
+ DMAC_DMAGO(tch);
+ }
+ {
+ DMAC_DMAMOV(rch, SAR, SPI_RECEIVE_BUFFER_REG_ADDR);
+ DMAC_DMAMOV(rch, DAR, rdma);
+ DMAC_DMAMOV(rch, CCR,
+ dmac_create_ctrlval(0, 1, 1, rx_inc, 1, 1, 0));
+
+ if (lc1)
+ DMAC_DMALP(rch, 1, lc1);
+ DMAC_DMALP(rch, 0, lc0);
+ DMAC_DMAWFP(rch, DMAC_SPI_PERIPH_ID, PERIPHERAL);
+ DMAC_DMALDP(rch, DMAC_SPI_PERIPH_ID, 0);
+ DMAC_DMASTS(rch);
+ DMAC_DMAWMB(rch);
+ DMAC_DMASEV(rch, rev);
+ DMAC_WFE(rch, tev);
+ DMAC_DMALPEND(rch, 0,
+ DMAWFE_INSTR_SIZE + DMASEV_INSTR_SIZE +
+ DMAWMB_INSTR_SIZE + DMAST_INSTR_SIZE +
+ DMALDP_INSTR_SIZE + DMAWFP_INSTR_SIZE, 1);
+ if (lc1)
+ DMAC_DMALPEND(rch, 1,
+ DMAWFE_INSTR_SIZE +
+ DMASEV_INSTR_SIZE + DMAWMB_INSTR_SIZE +
+ DMAST_INSTR_SIZE + DMALDP_INSTR_SIZE +
+ DMAWFP_INSTR_SIZE + DMALP_INSTR_SIZE +
+ DMALPEND_INSTR_SIZE, 1);
+
+
+ if (rump) {
+ DMAC_DMALP(rch, 0, rump);
+ DMAC_DMAWFP(rch, DMAC_SPI_PERIPH_ID, PERIPHERAL);
+ DMAC_DMALDP(rch, DMAC_SPI_PERIPH_ID, 0);
+ DMAC_DMASTS(rch);
+ DMAC_DMAWMB(rch);
+ DMAC_DMASEV(rch, rev);
+ DMAC_WFE(rch, tev);
+ DMAC_DMALPEND(rch, 0,
+ DMAWFE_INSTR_SIZE +
+ DMASEV_INSTR_SIZE + DMAWMB_INSTR_SIZE +
+ DMAST_INSTR_SIZE + DMALDP_INSTR_SIZE +
+ DMAWFP_INSTR_SIZE, 1);
+ }
+ // extra RX
+ DMAC_DMAWFP(rch, DMAC_SPI_PERIPH_ID, PERIPHERAL);
+ DMAC_DMALDP(rch, DMAC_SPI_PERIPH_ID, 0);
+ DMAC_DMASTS(rch);
+ DMAC_DMAWMB(rch);
+
+ DMAC_DMAFLUSHP(rch, DMAC_SPI_PERIPH_ID);
+ DMAC_DMASEV(rch, rch); // This will generate an interrupt
+ DMAC_DMAEND(rch);
+ DMAC_DMAGO(rch);
+ }
+ return 0;
+}
+
+static void cns3xxx_spi_dma_uninitialize(int rch, int tch, int revt, int tevt)
+{
+ dmac_release_event(rch, revt);
+ dmac_release_event(tch, tevt);
+ dmac_release_channel(rch);
+ dmac_release_channel(tch);
+ return;
+}
+
+#endif /* CONFIG_SPI_CNS3XXX_USEDMA */
+
+static int cns3xxx_spi_txrx(struct spi_device *spi, struct spi_transfer *t)
+{
+ struct cns3xxx_spi *hw = to_hw(spi);
+#ifdef CONFIG_SPI_CNS3XXX_USEDMA
+ int spi_rxchan, spi_txchan, spi_rxevt, spi_txevt;
+ int rx_data;
+#endif
+ dev_dbg(&spi->dev, "txrx: tx %p, rx %p, len %d\n", t->tx_buf, t->rx_buf,
+ t->len);
+
+ hw->tx = t->tx_buf;
+ hw->rx = t->rx_buf;
+ hw->len = t->len;
+ hw->count = 0;
+ hw->last_in_message_list = t->last_in_message_list;
+
+#ifdef CONFIG_SPI_CNS3XXX_USEDMA
+ init_completion(&hw->done);
+
+ if (cns3xxx_spi_dma_initialize
+ (&spi_rxchan, &spi_txchan, &spi_rxevt, &spi_txevt, hw)) {
+ dev_dbg(&spi->dev, "%s:%d Could not initialize DMA. \n",
+ __FUNCTION__, __LINE__);
+ return 0;
+ }
+
+ if (t->tx_buf)
+ t->tx_dma =
+ dma_map_single(NULL, t->tx_buf, t->len, DMA_TO_DEVICE);
+ if (t->rx_buf)
+ t->rx_dma =
+ dma_map_single(NULL, t->rx_buf, t->len, DMA_FROM_DEVICE);
+
+ if (cns3xxx_spi_start_dma
+ (spi_rxchan, spi_txchan, spi_rxevt, spi_txevt, t, hw)) {
+ dev_dbg(&spi->dev, "Could not start DMA. \n");
+ if (t->tx_buf)
+ dma_unmap_single(NULL, t->tx_dma, t->len,
+ DMA_TO_DEVICE);
+ t->tx_dma = 0;
+ if (t->rx_buf)
+ dma_unmap_single(NULL, t->rx_dma, t->len,
+ DMA_FROM_DEVICE);
+ t->rx_dma = 0;
+ cns3xxx_spi_dma_uninitialize(spi_rxchan, spi_txchan, spi_rxevt,
+ spi_txevt);
+ return 0;
+ }
+
+ wait_for_completion(&hw->done);
+
+ dev_dbg(&spi->dev, "DMA reported completion of transfer of %d bytes\n",
+ t->len - 1);
+
+ if (t->tx_buf)
+ dma_unmap_single(NULL, t->tx_dma, t->len, DMA_TO_DEVICE);
+ t->tx_dma = 0;
+ if (t->rx_buf)
+ dma_unmap_single(NULL, t->rx_dma, t->len, DMA_FROM_DEVICE);
+ t->rx_dma = 0;
+ cns3xxx_spi_dma_uninitialize(spi_rxchan, spi_txchan, spi_rxevt,
+ spi_txevt);
+
+ if (t->last_in_message_list)
+ cns3xxx_spi_tx_rx(spi->chip_select, 1,
+ (hw->tx) ? hw->tx[hw->len - 1] : 0xff,
+ &rx_data);
+ else
+ cns3xxx_spi_tx_rx(spi->chip_select, 0,
+ (hw->tx) ? hw->tx[hw->len - 1] : 0xff,
+ &rx_data);
+
+ if (hw->rx)
+ hw->rx[hw->len - 1] = rx_data & 0xff;
+
+ return hw->len;
+
+#else /* !CONFIG_SPI_CNS3XXX_USEDMA */
+
+#ifdef CNS3XXX_SPI_INTERRUPT
+
+ init_completion(&hw->done);
+
+ /* Effectively, we are enabling only the Receive Buffer Interrupt Enable */
+ /* TX Buf Underrun and RX Buf Overrun are not to happen */
+ SPI_INTERRUPT_ENABLE_REG = (0x1 << 2);
+// (0x0) | (0x1 << 2) | (0x0 << 3) | (0x1 << 6) | (0x1 << 7);
+
+ /* Write data and wait for completion */
+ SPI_TRANSMIT_CONTROL_REG &= ~(0x7);
+ SPI_TRANSMIT_CONTROL_REG |= (spi->chip_select & 0x3) |
+ ((((hw->last_in_message_list) && (hw->len == 1)) ? 0x1 : 0x0) << 2);
+
+ SPI_TRANSMIT_BUFFER_REG = (hw->tx) ? hw->tx[hw->count] : 0xff;
+
+ wait_for_completion(&hw->done);
+
+ SPI_INTERRUPT_ENABLE_REG = 0;
+
+ return hw->count;
+
+#else /* !CNS3XXX_SPI_INTERRUPT */
+
+ init_completion(&hw->done);
+
+ if (hw->tx) {
+ int i;
+ u32 rx_data;
+ for (i = 0; i < (hw->len - 1); i++) {
+ dev_dbg(&spi->dev,
+ "[SPI_CNS3XXX_DEBUG] hw->tx[%02d]: 0x%02x\n", i,
+ hw->tx[i]);
+ cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
+ &rx_data);
+ if (hw->rx) {
+ hw->rx[i] = rx_data;
+ dev_dbg(&spi->dev,
+ "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
+ i, hw->rx[i]);
+ }
+ }
+
+ if (t->last_in_message_list) {
+ cns3xxx_spi_tx_rx(spi->chip_select, 1, hw->tx[i],
+ &rx_data);
+ if (hw->rx) {
+ hw->rx[i] = rx_data;
+ dev_dbg(&spi->dev,
+ "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
+ i, hw->rx[i]);
+ }
+ } else {
+ cns3xxx_spi_tx_rx(spi->chip_select, 0, hw->tx[i],
+ &rx_data);
+ }
+ goto done;
+ }
+
+ if (hw->rx) {
+ int i;
+ u32 rx_data;
+ for (i = 0; i < (hw->len - 1); i++) {
+ cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
+ hw->rx[i] = rx_data;
+ dev_dbg(&spi->dev,
+ "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n", i,
+ hw->rx[i]);
+ }
+
+ if (t->last_in_message_list) {
+ cns3xxx_spi_tx_rx(spi->chip_select, 1, 0xff, &rx_data);
+ } else {
+ cns3xxx_spi_tx_rx(spi->chip_select, 0, 0xff, &rx_data);
+ }
+ hw->rx[i] = rx_data;
+ dev_dbg(&spi->dev, "[SPI_CNS3XXX_DEBUG] hw->rx[%02d]: 0x%02x\n",
+ i, hw->rx[i]);
+ }
+done:
+ return hw->len;
+
+#endif /* CNS3XXX_SPI_INTERRUPT */
+
+#endif /* CONFIG_SPI_CNS3XXX_USEDMA */
+}
+
+#ifdef CNS3XXX_SPI_INTERRUPT
+/* Driver supports single master only.
+ * We have disabled fifo, so we wait for the receive buff full interrupt.
+ * Receive Buff overrun, transmit buff underrun are not to happen
+ */
+static irqreturn_t cns3xxx_spi_irq(int irq, void *dev)
+{
+ struct cns3xxx_spi *hw = dev;
+ uint32_t int_status;
+ uint8_t data;
+ unsigned int count = hw->count;
+
+ /* Read the interrupt status and clear interrupt */
+ int_status = SPI_INTERRUPT_STATUS_REG;
+
+ if (!(int_status & (0x1 << 2))) {
+ printk("DEBUG THIS ! Unexpected interrupt (status = 0x%x)", int_status);
+ /* Clearing spurious interrupts */
+ SPI_INTERRUPT_STATUS_REG = (0xF << 4);
+ goto irq_done;
+ }
+
+ /* Read to clear */
+ data = SPI_RECEIVE_BUFFER_REG & 0xff;
+
+ if (hw->rx)
+ hw->rx[hw->count] = data;
+
+ hw->count++;
+ hw->len--;
+
+ if (hw->len) {
+ SPI_TRANSMIT_CONTROL_REG |=
+ ((((hw->last_in_message_list) && (hw->len == 1)) ? 0x1 : 0x0) << 2);
+ SPI_TRANSMIT_BUFFER_REG = (hw->tx) ? hw->tx[hw->count] : 0xff;
+ } else {
+ complete(&hw->done);
+ }
+
+irq_done:
+ return IRQ_HANDLED;
+}
+#endif
+
+static void __init cns3xxx_spi_initial(void)
+{
+
+ /* share pin config. */
+#if 1
+#if 0
+ /* GPIOB18 is set to PCM by default */
+ MISC_GPIOB_PIN_ENABLE_REG &= ~(MISC_GSW_P0_CRS_PIN);
+ gpio_direction_output(50, 1);
+#endif
+ PM_PLL_HM_PD_CTRL_REG &= ~(0x1 << 5);
+ HAL_MISC_ENABLE_SPI_PINS();
+ HAL_MISC_ENABLE_PCM_PINS(); /* this just for PCM test */
+ cns3xxx_pwr_clk_en(CNS3XXX_PWR_CLK_EN(SPI_PCM_I2C));
+ cns3xxx_pwr_soft_rst(CNS3XXX_PWR_SOFTWARE_RST(SPI_PCM_I2C));
+#endif
+
+ SPI_CONFIGURATION_REG = (((0x0 & 0x3) << 0) | /* 8bits shift length */
+ (0x0 << 9) | /* SPI mode */
+ (0x0 << 10) | /* disable FIFO */
+ (0x1 << 11) | /* SPI master mode */
+ (0x0 << 12) | /* disable SPI loopback mode */
+ (0x1 << 13) | /* clock phase */
+ (0x1 << 14) | /* clock polarity */
+ (0x0 << 24) | /* disable - SPI data swap */
+#ifdef CONFIG_SPI_CNS3XXX_2IOREAD
+ (0x1 << 29) | /* enable - 2IO Read mode */
+#else
+ (0x0 << 29) | /* disablea - 2IO Read mode */
+#endif
+ (0x0 << 30) | /* disable - SPI high speed read for system boot up */
+ (0x0 << 31)); /* disable - SPI */
+
+ /* Set SPI bit rate PCLK/2 */
+ SPI_BIT_RATE_CONTROL_REG = 0x1;
+
+ /* Set SPI Tx channel 0 */
+ SPI_TRANSMIT_CONTROL_REG = 0x0;
+
+ /* Set Tx FIFO Threshold, Tx FIFO has 2 words */
+ SPI_FIFO_TRANSMIT_CONFIG_REG &= ~(0x03 << 4);
+ SPI_FIFO_TRANSMIT_CONFIG_REG |= ((0x0 & 0x03) << 4);
+
+ /* Set Rx FIFO Threshold, Rx FIFO has 2 words */
+ SPI_FIFO_RECEIVE_CONFIG_REG &= ~(0x03 << 4);
+ SPI_FIFO_RECEIVE_CONFIG_REG |= ((0x0 & 0x03) << 4);
+
+ /* Disable all interrupt */
+ SPI_INTERRUPT_ENABLE_REG = 0x0;
+
+ /* Clear spurious interrupt sources */
+ SPI_INTERRUPT_STATUS_REG = (0x0F << 4);
+
+ /* Enable SPI */
+ SPI_CONFIGURATION_REG |= (0x1 << 31);
+
+ return;
+}
+
+static int __init cns3xxx_spi_probe(struct platform_device *pdev)
+{
+ struct spi_master *master;
+ struct cns3xxx_spi *hw;
+ int err = 0;
+
+ printk("%s: setup CNS3XXX SPI Controller", __FUNCTION__);
+#ifdef CONFIG_SPI_CNS3XXX_USEDMA
+ printk(" w/ DMA \n");
+#else
+#ifdef CNS3XXX_SPI_INTERRUPT
+ printk(" in Interrupt mode, w/o DMA \n");
+#else
+ printk(" in polling mode, w/o DMA \n");
+#endif
+#endif
+
+ /* share pin config. */
+// HAL_MISC_ENABLE_SPI_PINS();
+
+ /* Allocate master with space for cns3xxx_spi */
+ master = spi_alloc_master(&pdev->dev, sizeof(struct cns3xxx_spi));
+ if (master == NULL) {
+ dev_err(&pdev->dev, "No memory for spi_master\n");
+ err = -ENOMEM;
+ goto err_nomem;
+ }
+
+ hw = spi_master_get_devdata(master);
+ memset(hw, 0, sizeof(struct cns3xxx_spi));
+
+ hw->master = spi_master_get(master);
+ hw->dev = &pdev->dev;
+
+ platform_set_drvdata(pdev, hw);
+ init_completion(&hw->done);
+
+ /* setup the master state. */
+
+ master->num_chipselect = 4;
+ master->bus_num = 1;
+
+ /* setup the state for the bitbang driver */
+
+ hw->bitbang.master = hw->master;
+ hw->bitbang.setup_transfer = cns3xxx_spi_setup_transfer;
+ hw->bitbang.chipselect = cns3xxx_spi_chipselect;
+ hw->bitbang.txrx_bufs = cns3xxx_spi_txrx;
+ hw->bitbang.master->setup = cns3xxx_spi_setup;
+
+ dev_dbg(hw->dev, "bitbang at %p\n", &hw->bitbang);
+
+#ifdef CNS3XXX_SPI_INTERRUPT
+ err = request_irq(IRQ_CNS3XXX_SPI, cns3xxx_spi_irq, IRQF_SHARED, "cns3xxx_spi", hw);
+ if (err) {
+ dev_err(&pdev->dev, "Cannot claim IRQ\n");
+ goto err_no_irq;
+ }
+#endif
+
+ /* SPI controller initializations */
+ cns3xxx_spi_initial();
+
+ /* register SPI controller */
+
+ err = spi_bitbang_start(&hw->bitbang);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to register SPI master\n");
+ goto err_register;
+ }
+
+ spi_slave_probe();
+
+ return 0;
+
+err_register:
+#ifdef CNS3XXX_SPI_INTERRUPT
+err_no_irq:
+#endif
+ spi_master_put(hw->master);;
+
+err_nomem:
+ return err;
+}
+
+static int __devexit cns3xxx_spi_remove(struct platform_device *dev)
+{
+ struct cns3xxx_spi *hw = platform_get_drvdata(dev);
+
+ platform_set_drvdata(dev, NULL);
+
+ spi_unregister_master(hw->master);
+
+ //cns3xxx_spi_clk_disable();
+
+ spi_master_put(hw->master);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int cns3xxx_spi_suspend(struct platform_device *pdev, pm_message_t msg)
+{
+ struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
+
+ //cns3xxx_spi_clk_disable();
+ return 0;
+}
+
+static int cns3xxx_spi_resume(struct platform_device *pdev)
+{
+ struct cns3xxx_spi *hw = platform_get_drvdata(pdev);
+
+ //cns3xxx_spi_clk_enable()
+ return 0;
+}
+
+#else
+#define cns3xxx_spi_suspend NULL
+#define cns3xxx_spi_resume NULL
+#endif
+
+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
@@ -424,6 +424,12 @@ struct spi_transfer {
u16 delay_usecs;
u32 speed_hz;
+#ifdef CONFIG_ARCH_CNS3XXX
+ unsigned last_in_message_list;
+#ifdef CONFIG_SPI_CNS3XXX_2IOREAD
+ u8 dio_read;
+#endif
+#endif
struct list_head transfer_list;
};
@@ -627,6 +633,13 @@ spi_read(struct spi_device *spi, u8 *buf
return spi_sync(spi, &m);
}
+#ifdef CONFIG_ARCH_CNS3XXX
+extern int spi_write_read_sync(struct spi_device *spi,
+ const u8 *txbuf, unsigned n_tx,
+ u8 *rxbuf, unsigned n_rx);
+
+#endif
+
/* this copies txbuf and rxbuf data; for small transfers only! */
extern int spi_write_then_read(struct spi_device *spi,
const u8 *txbuf, unsigned n_tx,