[PATCH] SPI: SSP SPI Controller driver
From: chao bi
Date: Mon Dec 17 2012 - 03:57:31 EST
This patch is to implement SSP SPI controller driver, which has been applied and
validated on intel Moorestown & Medfield platform. The patch are originated by
Ken Mills <ken.k.mills@xxxxxxxxx> and Sylvain Centelles <sylvain.centelles@xxxxxxxxx>,
migrating to lateset Linux mainline SPI framework by Channing <chao.bi@xxxxxxxxx>
and Chen Jun <jun.d.chen@xxxxxxxxx> according to their integration & validation
on Medfield platform.
Signed-off-by: Ken Mills <ken.k.mills@xxxxxxxxx>
Signed-off-by: Sylvain Centelles <sylvain.centelles@xxxxxxxxx>
Signed-off-by: channing <chao.bi@xxxxxxxxx>
Signed-off-by: Chen Jun <jun.d.chen@xxxxxxxxx>
---
drivers/spi/Kconfig | 9 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-intel-mid-ssp.c | 1633 +++++++++++++++++++++++++++++++++
include/linux/spi/spi-intel-mid-ssp.h | 103 +++
4 files changed, 1746 insertions(+), 0 deletions(-)
create mode 100644 drivers/spi/spi-intel-mid-ssp.c
create mode 100644 include/linux/spi/spi-intel-mid-ssp.h
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 2e188e1..6285f17 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -186,6 +186,15 @@ config SPI_IMX
This enables using the Freescale i.MX SPI controllers in master
mode.
+config SPI_INTEL_MID_SSP
+ tristate "SSP SPI controller driver for Intel MID platforms"
+ depends on SPI_MASTER && INTEL_MID_DMAC
+ help
+ This is the unified SSP SPI master controller driver for
+ the Intel MID platforms, handling Moorestown & Medfield,
+ master clock mode.
+ It supports Bulverde SSP core.
+
config SPI_LM70_LLP
tristate "Parallel port adapter for LM70 eval board (DEVELOPMENT)"
depends on PARPORT && EXPERIMENTAL
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 64e970b..1738966 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -33,6 +33,7 @@ obj-$(CONFIG_SPI_FSL_ESPI) += spi-fsl-espi.o
obj-$(CONFIG_SPI_FSL_SPI) += spi-fsl-spi.o
obj-$(CONFIG_SPI_GPIO) += spi-gpio.o
obj-$(CONFIG_SPI_IMX) += spi-imx.o
+obj-$(CONFIG_SPI_INTEL_MID_SSP) += spi-intel-mid-ssp.o
obj-$(CONFIG_SPI_LM70_LLP) += spi-lm70llp.o
obj-$(CONFIG_SPI_MPC512x_PSC) += spi-mpc512x-psc.o
obj-$(CONFIG_SPI_MPC52xx_PSC) += spi-mpc52xx-psc.o
diff --git a/drivers/spi/spi-intel-mid-ssp.c b/drivers/spi/spi-intel-mid-ssp.c
new file mode 100644
index 0000000..760156e
--- /dev/null
+++ b/drivers/spi/spi-intel-mid-ssp.c
@@ -0,0 +1,1633 @@
+/*
+ * spi-intel-mid-ssp.c
+ * This driver supports Bulverde SSP core used on Intel MID platforms
+ * It supports SSP of Moorestown & Medfield platforms and handles clock
+ * slave & master modes.
+ *
+ * Copyright (c) 2010, Intel Corporation.
+ * Ken Mills <ken.k.mills@xxxxxxxxx>
+ * Sylvain Centelles <sylvain.centelles@xxxxxxxxx>
+ * Jun Chen <jun.d.chen@xxxxxxxxx>
+ * Chao Bi <chao.bi@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+/*
+ * Note:
+ *
+ * Supports DMA and non-interrupt polled transfers.
+ *
+ */
+
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/highmem.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/dma-mapping.h>
+#include <linux/intel_mid_dma.h>
+#include <linux/pm_qos.h>
+#include <linux/module.h>
+#include <linux/spi/spi-intel-mid-ssp.h>
+
+#define PCI_MRST_DMAC1_ID 0x0814
+#define PCI_MDFL_DMAC1_ID 0x0827
+
+#define SSP_NOT_SYNC 0x400000
+#define MAX_SPI_TRANSFER_SIZE 8192
+#define MAX_BITBANGING_LOOP 10000
+#define SPI_FIFO_SIZE 16
+
+/* PM QoS define */
+#define MIN_EXIT_LATENCY 20
+
+/* SPI DMA max transfer time */
+#define SSP_SPI_DMA_TIMEOUT 100
+
+/* SSP assignement configuration from PCI config */
+#define SSP_CFG_GET_MODE(ssp_cfg) ((ssp_cfg) & 0x07)
+#define SSP_CFG_GET_SPI_BUS_NB(ssp_cfg) (((ssp_cfg) >> 3) & 0x07)
+#define SSP_CFG_IS_SPI_SLAVE(ssp_cfg) ((ssp_cfg) & 0x40)
+#define SSP_CFG_SPI_MODE_ID 1
+/* adid field offset is 6 inside the vendor specific capability */
+#define VNDR_CAPABILITY_ADID_OFFSET 6
+
+/* Driver's quirk flags */
+/* This workarround bufferizes data in the audio fabric SDRAM from */
+/* where the DMA transfers will operate. Should be enabled only for */
+/* SPI slave mode. */
+#define QUIRKS_SRAM_ADDITIONAL_CPY 1
+/* If set the trailing bytes won't be handled by the DMA. */
+/* Trailing byte feature not fully available. */
+#define QUIRKS_DMA_USE_NO_TRAIL 2
+/* If set, the driver will use PM_QOS to reduce the latency */
+/* introduced by the deeper C-states which may produce over/under */
+/* run issues. Must be used in slave mode. In master mode, the */
+/* latency is not critical, but setting this workarround may */
+/* improve the SPI throughput. */
+#define QUIRKS_USE_PM_QOS 4
+/* This quirks is set on Moorestown */
+#define QUIRKS_PLATFORM_MRST 8
+/* This quirks is set on Medfield */
+#define QUIRKS_PLATFORM_MDFL 16
+/* If set, the driver will apply the bitbanging workarround needed */
+/* to enable defective Langwell stepping A SSP. The defective SSP */
+/* can be enabled only once, and should never be disabled. */
+#define QUIRKS_BIT_BANGING 32
+/* If set, SPI is in slave clock mode */
+#define QUIRKS_SPI_SLAVE_CLOCK_MODE 64
+
+/* Uncomment to get RX and TX short dumps after each transfer */
+/* #define DEBUG_DUMP_RX 1 */
+#define MAX_TRAILING_BYTE_RETRY 16
+#define MAX_TRAILING_BYTE_LOOP 100
+#define DELAY_TO_GET_A_WORD 3
+#define DFLT_TIMEOUT_VAL 500
+
+#define DEFINE_SSP_REG(reg, off) \
+static inline u32 read_##reg(void *p) { return __raw_readl(p + (off)); } \
+static inline void write_##reg(u32 v, void *p) { __raw_writel(v, p + (off)); }
+
+#define RX_DIRECTION 0
+#define TX_DIRECTION 1
+
+#define I2C_ACCESS_USDELAY 10
+
+#define DFLT_BITS_PER_WORD 16
+#define MIN_BITS_PER_WORD 4
+#define MAX_BITS_PER_WORD 32
+#define DFLT_FIFO_BURST_SIZE IMSS_FIFO_BURST_8
+
+#define TRUNCATE(x, a) ((x) & ~((a)-1))
+
+DEFINE_SSP_REG(SSCR0, 0x00)
+DEFINE_SSP_REG(SSCR1, 0x04)
+DEFINE_SSP_REG(SSSR, 0x08)
+DEFINE_SSP_REG(SSITR, 0x0c)
+DEFINE_SSP_REG(SSDR, 0x10)
+DEFINE_SSP_REG(SSTO, 0x28)
+DEFINE_SSP_REG(SSPSP, 0x2c)
+
+DEFINE_SSP_REG(I2CCTRL, 0x00);
+DEFINE_SSP_REG(I2CDATA, 0x04);
+
+DEFINE_SSP_REG(GPLR1, 0x04);
+DEFINE_SSP_REG(GPDR1, 0x0c);
+DEFINE_SSP_REG(GPSR1, 0x14);
+DEFINE_SSP_REG(GPCR1, 0x1C);
+DEFINE_SSP_REG(GAFR1_U, 0x44);
+
+#define SYSCFG 0x20bc0
+
+#define SRAM_BASE_ADDR 0xfffdc000
+#define SRAM_RX_ADDR SRAM_BASE_ADDR
+#define SRAM_TX_ADDR (SRAM_BASE_ADDR + MAX_SPI_TRANSFER_SIZE)
+
+#define SSCR0_DSS (0x0000000f) /* Data Size Select (mask) */
+#define SSCR0_DataSize(x) ((x) - 1) /* Data Size Select [4..16] */
+#define SSCR0_FRF (0x00000030) /* FRame Format (mask) */
+#define SSCR0_Motorola (0x0 << 4) /* Motorola's SPI mode */
+#define SSCR0_ECS (1 << 6) /* External clock select */
+#define SSCR0_SSE (1 << 7) /* Synchronous Serial Port Enable */
+
+#define SSCR0_SCR (0x000fff00) /* Serial Clock Rate (mask) */
+#define SSCR0_SerClkDiv(x) (((x) - 1) << 8) /* Divisor [1..4096] */
+#define SSCR0_EDSS (1 << 20) /* Extended data size select */
+#define SSCR0_NCS (1 << 21) /* Network clock select */
+#define SSCR0_RIM (1 << 22) /* Receive FIFO overrrun int mask */
+#define SSCR0_TUM (1 << 23) /* Transmit FIFO underrun int mask */
+#define SSCR0_FRDC (0x07000000) /* Frame rate divider control (mask) */
+#define SSCR0_SlotsPerFrm(x) (((x) - 1) << 24) /* Time slots per frame */
+#define SSCR0_ADC (1 << 30) /* Audio clock select */
+#define SSCR0_MOD (1 << 31) /* Mode (normal or network) */
+
+#define SSCR1_RIE (1 << 0) /* Receive FIFO Interrupt Enable */
+#define SSCR1_TIE (1 << 1) /* Transmit FIFO Interrupt Enable */
+#define SSCR1_LBM (1 << 2) /* Loop-Back Mode */
+#define SSCR1_SPO (1 << 3) /* SSPSCLK polarity setting */
+#define SSCR1_SPH (1 << 4) /* Motorola SPI SSPSCLK phase setting */
+#define SSCR1_MWDS (1 << 5) /* Microwire Transmit Data Size */
+#define SSCR1_TFT (0x000003c0) /* Transmit FIFO Threshold (mask) */
+#define SSCR1_TxTresh(x) (((x) - 1) << 6) /* level [1..16] */
+#define SSCR1_RFT (0x00003c00) /* Receive FIFO Threshold (mask) */
+#define SSCR1_RxTresh(x) (((x) - 1) << 10) /* level [1..16] */
+
+#define SSSR_TNF (1 << 2) /* Tx FIFO Not Full */
+#define SSSR_RNE (1 << 3) /* Rx FIFO Not Empty */
+#define SSSR_BSY (1 << 4) /* SSP Busy */
+#define SSSR_TFS (1 << 5) /* Tx FIFO Service Request */
+#define SSSR_RFS (1 << 6) /* Rx FIFO Service Request */
+#define SSSR_ROR (1 << 7) /* Rx FIFO Overrun */
+#define SSSR_TFL_MASK (0x0F << 8) /* Tx FIFO level field mask */
+
+#define SSCR0_TIM (1 << 23) /* Transmit FIFO Under Run Int Mask */
+#define SSCR0_RIM (1 << 22) /* Receive FIFO Over Run int Mask */
+#define SSCR0_NCS (1 << 21) /* Network Clock Select */
+#define SSCR0_EDSS (1 << 20) /* Extended Data Size Select */
+
+#define SSCR0_TISSP (1 << 4) /* TI Sync Serial Protocol */
+#define SSCR0_PSP (3 << 4) /* PSP - Programmable Serial Protocol */
+#define SSCR1_TTELP (1 << 31) /* TXD Tristate Enable Last Phase */
+#define SSCR1_TTE (1 << 30) /* TXD Tristate Enable */
+#define SSCR1_EBCEI (1 << 29) /* Enable Bit Count Error interrupt */
+#define SSCR1_SCFR (1 << 28) /* Slave Clock free Running */
+#define SSCR1_ECRA (1 << 27) /* Enable Clock Request A */
+#define SSCR1_ECRB (1 << 26) /* Enable Clock request B */
+#define SSCR1_SCLKDIR (1 << 25) /* Serial Bit Rate Clock Direction */
+#define SSCR1_SFRMDIR (1 << 24) /* Frame Direction */
+#define SSCR1_RWOT (1 << 23) /* Receive Without Transmit */
+#define SSCR1_TRAIL (1 << 22) /* Trailing Byte */
+#define SSCR1_TSRE (1 << 21) /* Transmit Service Request Enable */
+#define SSCR1_RSRE (1 << 20) /* Receive Service Request Enable */
+#define SSCR1_TINTE (1 << 19) /* Receiver Time-out Interrupt enable */
+#define SSCR1_PINTE (1 << 18) /* Trailing Byte Interupt Enable */
+#define SSCR1_STRF (1 << 15) /* Select FIFO or EFWR */
+#define SSCR1_EFWR (1 << 14) /* Enable FIFO Write/Read */
+#define SSCR1_IFS (1 << 16) /* Invert Frame Signal */
+
+#define SSSR_BCE (1 << 23) /* Bit Count Error */
+#define SSSR_CSS (1 << 22) /* Clock Synchronisation Status */
+#define SSSR_TUR (1 << 21) /* Transmit FIFO Under Run */
+#define SSSR_EOC (1 << 20) /* End Of Chain */
+#define SSSR_TINT (1 << 19) /* Receiver Time-out Interrupt */
+#define SSSR_PINT (1 << 18) /* Peripheral Trailing Byte Interrupt */
+
+#define SSPSP_FSRT (1 << 25) /* Frame Sync Relative Timing */
+#define SSPSP_DMYSTOP(x) ((x) << 23) /* Dummy Stop */
+#define SSPSP_SFRMWDTH(x)((x) << 16) /* Serial Frame Width */
+#define SSPSP_SFRMDLY(x) ((x) << 9) /* Serial Frame Delay */
+#define SSPSP_DMYSTRT(x) ((x) << 7) /* Dummy Start */
+#define SSPSP_STRTDLY(x) ((x) << 4) /* Start Delay */
+#define SSPSP_ETDS (1 << 3) /* End of Transfer data State */
+#define SSPSP_SFRMP (1 << 2) /* Serial Frame Polarity */
+#define SSPSP_SCMODE(x) ((x) << 0) /* Serial Bit Rate Clock Mode */
+
+/*
+ * For testing SSCR1 changes that require SSP restart, basically
+ * everything except the service and interrupt enables
+ */
+
+#define SSCR1_CHANGE_MASK (SSCR1_TTELP | SSCR1_TTE | SSCR1_SCFR \
+ | SSCR1_ECRA | SSCR1_ECRB | SSCR1_SCLKDIR \
+ | SSCR1_SFRMDIR | SSCR1_RWOT | SSCR1_TRAIL \
+ | SSCR1_IFS | SSCR1_STRF | SSCR1_EFWR \
+ | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \
+ | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
+
+struct midssp_chip_data {
+ u32 cr0;
+ u32 cr1;
+ u32 timeout;
+ u8 n_bytes;
+ u8 dma_enabled;
+ u8 bits_per_word;
+ u32 speed_hz;
+ int (*write)(struct ssp_driver_context *drv_context);
+ int (*read)(struct ssp_driver_context *drv_context);
+};
+
+enum intel_mid_ssp_spi_fifo_burst {
+ IMSS_FIFO_BURST_1,
+ IMSS_FIFO_BURST_4,
+ IMSS_FIFO_BURST_8
+};
+
+/* spi_board_info.controller_data for SPI slave devices,
+ * copied to spi_device.platform_data ... mostly for dma tuning
+ */
+struct intel_mid_ssp_spi_chip {
+ enum intel_mid_ssp_spi_fifo_burst burst_size;
+ u32 timeout;
+ u8 enable_loopback;
+ u8 dma_enabled;
+};
+
+MODULE_AUTHOR("Ken Mills");
+MODULE_DESCRIPTION("Bulverde SSP core SPI contoller");
+MODULE_LICENSE("GPL");
+
+#ifdef DEBUG_DUMP_RX
+static void dump_trailer(const char *prefix, char *buf, int len)
+{
+ print_hex_dump_bytes(prefix, DUMP_PREFIX_OFFSET, buf, len);
+}
+#endif
+
+static inline bool is_tx_fifo_empty(struct ssp_driver_context *drv_context)
+{
+ u32 sssr;
+ sssr = read_SSSR(drv_context->ioaddr);
+ return ((sssr & SSSR_TNF) && ((sssr & SSSR_TFL_MASK) == 0));
+}
+
+static inline bool is_rx_fifo_empty(struct ssp_driver_context *drv_context)
+{
+ return ((read_SSSR(drv_context->ioaddr) & SSSR_RNE) == 0);
+}
+
+static inline void disable_interface(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
+}
+
+static inline void disable_triggers(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ write_SSCR1(read_SSCR1(reg) & ~drv_context->cr1_sig, reg);
+}
+
+
+static void flush(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ u32 i = 0;
+
+ /* If the transmit fifo is not empty, reset the interface. */
+ if (!is_tx_fifo_empty(drv_context)) {
+ dev_err(&drv_context->pdev->dev,
+ "TX FIFO not empty. Reset of SPI IF");
+ disable_interface(drv_context);
+ return;
+ }
+
+ dev_dbg(&drv_context->pdev->dev, " SSSR=%x\r\n", read_SSSR(reg));
+ while (!is_rx_fifo_empty(drv_context) && (i < SPI_FIFO_SIZE + 1)) {
+ read_SSDR(reg);
+ i++;
+ }
+ WARN(i > 0, "%d words flush occured\n", i);
+
+ return;
+}
+
+static int null_writer(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ u8 n_bytes = drv_context->n_bytes;
+
+ if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
+ || (drv_context->tx == drv_context->tx_end))
+ return 0;
+
+ write_SSDR(0, reg);
+ drv_context->tx += n_bytes;
+
+ return 1;
+}
+
+static int null_reader(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ u8 n_bytes = drv_context->n_bytes;
+
+ while ((read_SSSR(reg) & SSSR_RNE)
+ && (drv_context->rx < drv_context->rx_end)) {
+ read_SSDR(reg);
+ drv_context->rx += n_bytes;
+ }
+
+ return drv_context->rx == drv_context->rx_end;
+}
+
+static int u8_writer(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
+ || (drv_context->tx == drv_context->tx_end))
+ return 0;
+
+ write_SSDR(*(u8 *)(drv_context->tx), reg);
+ ++drv_context->tx;
+
+ return 1;
+}
+
+static int u8_reader(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ while ((read_SSSR(reg) & SSSR_RNE)
+ && (drv_context->rx < drv_context->rx_end)) {
+ *(u8 *)(drv_context->rx) = read_SSDR(reg);
+ ++drv_context->rx;
+ }
+
+ return drv_context->rx == drv_context->rx_end;
+}
+
+static int u16_writer(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
+ || (drv_context->tx == drv_context->tx_end))
+ return 0;
+
+ write_SSDR(*(u16 *)(drv_context->tx), reg);
+ drv_context->tx += 2;
+
+ return 1;
+}
+
+static int u16_reader(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ while ((read_SSSR(reg) & SSSR_RNE)
+ && (drv_context->rx < drv_context->rx_end)) {
+ *(u16 *)(drv_context->rx) = read_SSDR(reg);
+ drv_context->rx += 2;
+ }
+
+ return drv_context->rx == drv_context->rx_end;
+}
+
+static int u32_writer(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ if (((read_SSSR(reg) & SSSR_TFL_MASK) == SSSR_TFL_MASK)
+ || (drv_context->tx == drv_context->tx_end))
+ return 0;
+
+ write_SSDR(*(u32 *)(drv_context->tx), reg);
+ drv_context->tx += 4;
+
+ return 1;
+}
+
+static int u32_reader(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ while ((read_SSSR(reg) & SSSR_RNE)
+ && (drv_context->rx < drv_context->rx_end)) {
+ *(u32 *)(drv_context->rx) = read_SSDR(reg);
+ drv_context->rx += 4;
+ }
+
+ return drv_context->rx == drv_context->rx_end;
+}
+
+static bool chan_filter(struct dma_chan *chan, void *param)
+{
+ struct ssp_driver_context *drv_context =
+ (struct ssp_driver_context *)param;
+ bool ret = false;
+
+ if (!drv_context->dmac1)
+ return ret;
+
+ if (chan->device->dev == &drv_context->dmac1->dev)
+ ret = true;
+
+ return ret;
+}
+
+/**
+ * unmap_dma_buffers() - Unmap the DMA buffers used during the last transfer.
+ * @drv_context: Pointer to the private driver context
+ */
+static void unmap_dma_buffers(struct ssp_driver_context *drv_context)
+{
+ struct device *dev = &drv_context->pdev->dev;
+
+ if (!drv_context->dma_mapped)
+ return;
+ dma_unmap_single(dev, drv_context->rx_dma, drv_context->len,
+ PCI_DMA_FROMDEVICE);
+ dma_unmap_single(dev, drv_context->tx_dma, drv_context->len,
+ PCI_DMA_TODEVICE);
+ drv_context->dma_mapped = 0;
+}
+
+/**
+ * drain_trail() - Handle trailing bytes of a transfer
+ * @drv_context: Pointer to the private driver context
+ *
+ * This function handles the trailing bytes of a transfer for the case
+ * they are not handled by the DMA.
+ */
+void drain_trail(struct ssp_driver_context *drv_context)
+{
+ struct device *dev = &drv_context->pdev->dev;
+ void *reg = drv_context->ioaddr;
+
+ if (drv_context->len != drv_context->len_dma_rx) {
+ dev_dbg(dev, "Handling trailing bytes. SSSR:%08x\n",
+ read_SSSR(reg));
+ drv_context->rx += drv_context->len_dma_rx;
+ drv_context->tx += drv_context->len_dma_tx;
+
+ while ((drv_context->tx != drv_context->tx_end) ||
+ (drv_context->rx != drv_context->rx_end)) {
+ drv_context->read(drv_context);
+ drv_context->write(drv_context);
+ }
+ }
+}
+
+/**
+ * sram_to_ddr_cpy() - Copy data from Langwell SDRAM to DDR
+ * @drv_context: Pointer to the private driver context
+ */
+static void sram_to_ddr_cpy(struct ssp_driver_context *drv_context)
+{
+ u32 length = drv_context->len;
+
+ if ((drv_context->quirks & QUIRKS_DMA_USE_NO_TRAIL)
+ && (drv_context->len > drv_context->rx_fifo_threshold *
+ drv_context->n_bytes))
+ length = TRUNCATE(drv_context->len,
+ drv_context->rx_fifo_threshold * drv_context->n_bytes);
+
+ memcpy_fromio(drv_context->rx, drv_context->virt_addr_sram_rx, length);
+}
+
+/**
+ * int_transfer_complete() - Handle completion of current message
+ * @drv_context: Pointer to the private driver context
+ */
+static void int_transfer_complete(struct ssp_driver_context *drv_context)
+{
+ void *reg = drv_context->ioaddr;
+ struct device *dev = &drv_context->pdev->dev;
+
+ if (unlikely(drv_context->quirks & QUIRKS_USE_PM_QOS))
+ pm_qos_update_request(&drv_context->pm_qos_req,
+ PM_QOS_DEFAULT_VALUE);
+
+ if (unlikely(drv_context->quirks & QUIRKS_SRAM_ADDITIONAL_CPY))
+ sram_to_ddr_cpy(drv_context);
+
+ if (likely(drv_context->quirks & QUIRKS_DMA_USE_NO_TRAIL))
+ drain_trail(drv_context);
+ else
+ /* Stop getting Time Outs */
+ write_SSTO(0, reg);
+
+ drv_context->cur_msg->status = 0;
+ drv_context->cur_msg->actual_length = drv_context->len;
+
+#ifdef DEBUG_DUMP_RX
+ dump_trailer("DUMP_SPI_RX:", drv_context->rx, drv_context->len);
+#endif
+
+ dev_dbg(dev, "End of transfer. SSSR:%08X\n", read_SSSR(reg));
+
+ /*Current message is completed, notify the core to handle it*/
+ spi_finalize_current_message(drv_context->master);
+}
+
+/**
+ * intel_mid_ssp_spi_dma_done() - End of DMA transfer callback
+ * @arg: Pointer to the data provided at callback registration
+ *
+ * This function is set as callback for both RX and TX DMA transfers. The
+ * RX or TX 'done' flag is set acording to the direction of the ended
+ * transfer. Then, if both RX and TX flags are set, it means that the
+ * transfer job is completed.
+ */
+static void intel_mid_ssp_spi_dma_done(void *arg)
+{
+ struct callback_param *cb_param = (struct callback_param *)arg;
+ struct ssp_driver_context *drv_context = cb_param->drv_context;
+ struct device *dev = &drv_context->pdev->dev;
+ void *reg = drv_context->ioaddr;
+
+ if (cb_param->direction == TX_DIRECTION)
+ drv_context->txdma_done = 1;
+ else
+ drv_context->rxdma_done = 1;
+
+ dev_dbg(dev, "DMA callback for direction %d [RX done:%d] [TX done:%d]\n",
+ cb_param->direction, drv_context->rxdma_done,
+ drv_context->txdma_done);
+
+ if (drv_context->txdma_done && drv_context->rxdma_done) {
+ /* Clear Status Register */
+ write_SSSR(drv_context->clear_sr, reg);
+ dev_dbg(dev, "DMA done\n");
+ /* Disable Triggers to DMA or to CPU */
+ disable_triggers(drv_context);
+ unmap_dma_buffers(drv_context);
+ /* DMA done callback */
+ complete(&drv_context->dma_done);
+ }
+}
+
+/**
+ * intel_mid_ssp_spi_dma_init() - Initialize DMA
+ * @drv_context: Pointer to the private driver context
+ *
+ * This function is called at driver setup phase to allocate DMA
+ * ressources.
+ */
+static void intel_mid_ssp_spi_dma_init(struct ssp_driver_context *drv_context)
+{
+ struct intel_mid_dma_slave *rxs, *txs;
+ struct dma_slave_config *ds;
+ dma_cap_mask_t mask;
+ struct device *dev = &drv_context->pdev->dev;
+ unsigned int device_id;
+
+ /* Configure RX channel parameters */
+ rxs = &drv_context->dmas_rx;
+ ds = &rxs->dma_slave;
+
+ ds->direction = DMA_FROM_DEVICE;
+ rxs->hs_mode = LNW_DMA_HW_HS;
+ rxs->cfg_mode = LNW_DMA_PER_TO_MEM;
+ ds->dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ ds->src_addr_width = drv_context->n_bytes;
+
+ /* Use a DMA burst according to the FIFO thresholds */
+ if (drv_context->rx_fifo_threshold == 8) {
+ ds->src_maxburst = 8;
+ ds->dst_maxburst = 8;
+ } else if (drv_context->rx_fifo_threshold == 4) {
+ ds->src_maxburst = 4;
+ ds->dst_maxburst = 4;
+ } else {
+ ds->src_maxburst = 1;
+ ds->dst_maxburst = 1;
+ }
+
+ /* Configure TX channel parameters */
+ txs = &drv_context->dmas_tx;
+ ds = &txs->dma_slave;
+
+ ds->direction = DMA_TO_DEVICE;
+ txs->hs_mode = LNW_DMA_HW_HS;
+ txs->cfg_mode = LNW_DMA_MEM_TO_PER;
+ ds->src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ ds->dst_addr_width = drv_context->n_bytes;
+
+ /* Use a DMA burst according to the FIFO thresholds */
+ if (drv_context->rx_fifo_threshold == 8) {
+ ds->src_maxburst = 8;
+ ds->dst_maxburst = 8;
+ } else if (drv_context->rx_fifo_threshold == 4) {
+ ds->src_maxburst = 4;
+ ds->dst_maxburst = 4;
+ } else {
+ ds->src_maxburst = 1;
+ ds->dst_maxburst = 1;
+ }
+
+ /* Nothing more to do if already initialized */
+ if (drv_context->dma_initialized)
+ return;
+
+ /* Use DMAC1 */
+ if (drv_context->quirks & QUIRKS_PLATFORM_MRST)
+ device_id = PCI_MRST_DMAC1_ID;
+ else
+ device_id = PCI_MDFL_DMAC1_ID;
+
+ drv_context->dmac1 = pci_get_device(PCI_VENDOR_ID_INTEL,
+ device_id, NULL);
+
+ if (!drv_context->dmac1) {
+ dev_err(dev, "Can't find DMAC1");
+ return;
+ }
+
+ if (drv_context->quirks & QUIRKS_SRAM_ADDITIONAL_CPY) {
+ drv_context->virt_addr_sram_rx = ioremap_nocache(SRAM_BASE_ADDR,
+ 2 * MAX_SPI_TRANSFER_SIZE);
+ if (drv_context->virt_addr_sram_rx)
+ drv_context->virt_addr_sram_tx =
+ drv_context->virt_addr_sram_rx +
+ MAX_SPI_TRANSFER_SIZE;
+ else
+ dev_err(dev, "Virt_addr_sram_rx is null\n");
+ }
+
+ /* 1. Allocate rx channel */
+ dma_cap_zero(mask);
+ dma_cap_set(DMA_MEMCPY, mask);
+ dma_cap_set(DMA_SLAVE, mask);
+
+ drv_context->rxchan = dma_request_channel(mask, chan_filter,
+ drv_context);
+ if (!drv_context->rxchan)
+ goto err_exit;
+
+ drv_context->rxchan->private = rxs;
+
+ /* 2. Allocate tx channel */
+ dma_cap_set(DMA_SLAVE, mask);
+ dma_cap_set(DMA_MEMCPY, mask);
+
+ drv_context->txchan = dma_request_channel(mask, chan_filter,
+ drv_context);
+
+ if (!drv_context->txchan)
+ goto free_rxchan;
+ else
+ drv_context->txchan->private = txs;
+
+ /* set the dma done bit to 1 */
+ drv_context->txdma_done = 1;
+ drv_context->rxdma_done = 1;
+
+ drv_context->tx_param.drv_context = drv_context;
+ drv_context->tx_param.direction = TX_DIRECTION;
+ drv_context->rx_param.drv_context = drv_context;
+ drv_context->rx_param.direction = RX_DIRECTION;
+
+ drv_context->dma_initialized = 1;
+
+ return;
+
+free_rxchan:
+ dma_release_channel(drv_context->rxchan);
+err_exit:
+ dev_err(dev, "Error : DMA Channel Not available\n");
+
+ if (drv_context->quirks & QUIRKS_SRAM_ADDITIONAL_CPY)
+ iounmap(drv_context->virt_addr_sram_rx);
+
+ pci_dev_put(drv_context->dmac1);
+ return;
+}
+
+/**
+ * intel_mid_ssp_spi_dma_exit() - Release DMA ressources
+ * @drv_context: Pointer to the private driver context
+ */
+static void intel_mid_ssp_spi_dma_exit(struct ssp_driver_context *drv_context)
+{
+ dma_release_channel(drv_context->txchan);
+ dma_release_channel(drv_context->rxchan);
+
+ if (drv_context->quirks & QUIRKS_SRAM_ADDITIONAL_CPY)
+ iounmap(drv_context->virt_addr_sram_rx);
+
+ pci_dev_put(drv_context->dmac1);
+}
+
+/**
+ * dma_transfer() - Initiate a DMA transfer
+ * @drv_context: Pointer to the private driver context
+ */
+static void dma_transfer(struct ssp_driver_context *drv_context)
+{
+ dma_addr_t ssdr_addr;
+ struct dma_async_tx_descriptor *txdesc = NULL, *rxdesc = NULL;
+ struct dma_chan *txchan, *rxchan;
+ enum dma_ctrl_flags flag;
+ struct device *dev = &drv_context->pdev->dev;
+
+ /* get Data Read/Write address */
+ ssdr_addr = (dma_addr_t)(drv_context->paddr + 0x10);
+
+ if (drv_context->tx_dma)
+ drv_context->txdma_done = 0;
+
+ if (drv_context->rx_dma)
+ drv_context->rxdma_done = 0;
+
+ drv_context->dma_done.done = 0;
+
+ /* 2. prepare the RX dma transfer */
+ txchan = drv_context->txchan;
+ rxchan = drv_context->rxchan;
+
+ flag = DMA_PREP_INTERRUPT | DMA_CTRL_ACK;
+
+ if (likely(drv_context->quirks & QUIRKS_DMA_USE_NO_TRAIL)) {
+ /* Since the DMA is configured to do 32bits access */
+ /* to/from the DDR, the DMA transfer size must be */
+ /* a multiple of 4 bytes */
+ drv_context->len_dma_rx = drv_context->len & ~(4 - 1);
+ drv_context->len_dma_tx = drv_context->len_dma_rx;
+
+ /* In Rx direction, TRAIL Bytes are handled by memcpy */
+ if (drv_context->rx_dma &&
+ (drv_context->len_dma_rx >
+ drv_context->rx_fifo_threshold * drv_context->n_bytes))
+ drv_context->len_dma_rx =
+ TRUNCATE(drv_context->len_dma_rx,
+ drv_context->rx_fifo_threshold *
+ drv_context->n_bytes);
+ else if (!drv_context->rx_dma)
+ dev_err(dev, "ERROR : rx_dma is null\r\n");
+ } else {
+ /* TRAIL Bytes are handled by DMA */
+ if (drv_context->rx_dma) {
+ drv_context->len_dma_rx = drv_context->len;
+ drv_context->len_dma_tx = drv_context->len;
+ } else {
+ dev_err(dev, "ERROR : drv_context->rx_dma is null!\n");
+ }
+ }
+
+ rxdesc = rxchan->device->device_prep_dma_memcpy
+ (rxchan, /* DMA Channel */
+ drv_context->rx_dma, /* DAR */
+ ssdr_addr, /* SAR */
+ drv_context->len_dma_rx, /* Data Length */
+ flag); /* Flag */
+
+ if (rxdesc) {
+ rxdesc->callback = intel_mid_ssp_spi_dma_done;
+ rxdesc->callback_param = &drv_context->rx_param;
+ } else {
+ dev_dbg(dev, "rxdesc is null! (len_dma_rx:%zd)\n",
+ drv_context->len_dma_rx);
+ drv_context->rxdma_done = 1;
+ }
+
+ /* 3. prepare the TX dma transfer */
+ if (drv_context->tx_dma) {
+ txdesc = txchan->device->device_prep_dma_memcpy
+ (txchan, /* DMA Channel */
+ ssdr_addr, /* DAR */
+ drv_context->tx_dma, /* SAR */
+ drv_context->len_dma_tx, /* Data Length */
+ flag); /* Flag */
+ if (txdesc) {
+ txdesc->callback = intel_mid_ssp_spi_dma_done;
+ txdesc->callback_param = &drv_context->tx_param;
+ } else {
+ dev_dbg(dev, "txdesc is null! (len_dma_tx:%zd)\n",
+ drv_context->len_dma_tx);
+ drv_context->txdma_done = 1;
+ }
+ } else {
+ dev_err(dev, "ERROR : drv_context->tx_dma is null!\n");
+ return;
+ }
+
+ dev_info(dev, "DMA transfer len:%zd len_dma_tx:%zd len_dma_rx:%zd\n",
+ drv_context->len, drv_context->len_dma_tx,
+ drv_context->len_dma_rx);
+
+ if (rxdesc || txdesc) {
+ if (rxdesc) {
+ dev_dbg(dev, "Firing DMA RX channel\n");
+ rxdesc->tx_submit(rxdesc);
+ }
+ if (txdesc) {
+ dev_dbg(dev, "Firing DMA TX channel\n");
+ txdesc->tx_submit(txdesc);
+ }
+ } else {
+ struct callback_param cb_param;
+ cb_param.drv_context = drv_context;
+ dev_dbg(dev, "Bypassing DMA transfer\n");
+ intel_mid_ssp_spi_dma_done(&cb_param);
+ }
+}
+
+/**
+ * map_dma_buffers() - Map DMA buffer before a transfer
+ * @drv_context: Pointer to the private drivzer context
+ */
+static int map_dma_buffers(struct ssp_driver_context *drv_context)
+{
+ struct device *dev = &drv_context->pdev->dev;
+
+ if (unlikely(drv_context->dma_mapped)) {
+ dev_err(dev, "ERROR : DMA buffers already mapped\n");
+ return 0;
+ }
+ if (unlikely(drv_context->quirks & QUIRKS_SRAM_ADDITIONAL_CPY)) {
+ /* Copy drv_context->tx into sram_tx */
+ memcpy_toio(drv_context->virt_addr_sram_tx, drv_context->tx,
+ drv_context->len);
+#ifdef DEBUG_DUMP_RX
+ dump_trailer("DUMP_SPI_RX:", drv_context->tx,
+ drv_context->len);
+#endif
+ drv_context->rx_dma = SRAM_RX_ADDR;
+ drv_context->tx_dma = SRAM_TX_ADDR;
+ } else {
+ /* no QUIRKS_SRAM_ADDITIONAL_CPY */
+ if (unlikely(drv_context->dma_mapped))
+ return 1;
+
+ drv_context->tx_dma =
+ dma_map_single(dev, drv_context->tx, drv_context->len,
+ PCI_DMA_TODEVICE);
+ if (unlikely(dma_mapping_error(dev, drv_context->tx_dma))) {
+ dev_err(dev, "ERROR : tx dma mapping failed\n");
+ return 0;
+ }
+
+ drv_context->rx_dma =
+ dma_map_single(dev, drv_context->rx, drv_context->len,
+ PCI_DMA_FROMDEVICE);
+ if (unlikely(dma_mapping_error(dev, drv_context->rx_dma))) {
+ dma_unmap_single(dev, drv_context->tx_dma,
+ drv_context->len, DMA_TO_DEVICE);
+ dev_err(dev, "ERROR : rx dma mapping failed\n");
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static void poll_transfer_complete(struct ssp_driver_context *drv_context)
+{
+ struct spi_message *msg;
+
+ /* Update total byte transfered return count actual bytes read */
+ drv_context->cur_msg->actual_length +=
+ drv_context->len - (drv_context->rx_end - drv_context->rx);
+
+ drv_context->cur_msg->status = 0;
+
+ msg = drv_context->cur_msg;
+ if (likely(msg->complete))
+ msg->complete(msg->context);
+}
+
+/**
+ * ssp_int() - Interrupt handler
+ * @irq
+ * @dev_id
+ *
+ * The SSP interrupt is not used for transfer which are handled by
+ * DMA or polling: only under/over run are catched to detect
+ * broken transfers.
+ */
+static irqreturn_t ssp_int(int irq, void *dev_id)
+{
+ struct ssp_driver_context *drv_context = dev_id;
+ void *reg = drv_context->ioaddr;
+ struct device *dev = &drv_context->pdev->dev;
+ u32 status = read_SSSR(reg);
+
+ /* It should never be our interrupt since SSP will */
+ /* only trigs interrupt for under/over run. */
+ if (likely(!(status & drv_context->mask_sr)))
+ return IRQ_NONE;
+
+ if (status & SSSR_ROR || status & SSSR_TUR) {
+ dev_err(dev, "--- SPI ROR or TUR occurred : SSSR=%x\n", status);
+ WARN_ON(1);
+ if (status & SSSR_ROR)
+ dev_err(dev, "we have Overrun\n");
+ if (status & SSSR_TUR)
+ dev_err(dev, "we have Underrun\n");
+ }
+
+ /* We can fall here when not using DMA mode */
+ if (!drv_context->cur_msg) {
+ disable_interface(drv_context);
+ disable_triggers(drv_context);
+ }
+ /* clear status register */
+ write_SSSR(drv_context->clear_sr, reg);
+ return IRQ_HANDLED;
+}
+
+static void poll_transfer(unsigned long data)
+{
+ struct ssp_driver_context *drv_context =
+ (struct ssp_driver_context *)data;
+
+ if (drv_context->tx)
+ while (drv_context->tx != drv_context->tx_end) {
+ drv_context->write(drv_context);
+ drv_context->read(drv_context);
+ }
+
+ while (!drv_context->read(drv_context))
+ cpu_relax();
+
+ poll_transfer_complete(drv_context);
+}
+
+/**
+ * start_bitbanging() - Clock synchronization by bit banging
+ * @drv_context: Pointer to private driver context
+ *
+ * This clock synchronization will be removed as soon as it is
+ * handled by the SCU.
+ */
+static void start_bitbanging(struct ssp_driver_context *drv_context)
+{
+ u32 sssr;
+ u32 count = 0;
+ u32 cr0;
+ void *i2c_reg = drv_context->I2C_ioaddr;
+ struct device *dev = &drv_context->pdev->dev;
+ void *reg = drv_context->ioaddr;
+ struct midssp_chip_data *chip = \
+ spi_get_ctldata(drv_context->cur_msg->spi);
+ cr0 = chip->cr0;
+
+ dev_warn(dev, "In %s : Starting bit banging\n",\
+ __func__);
+ if (read_SSSR(reg) & SSP_NOT_SYNC)
+ dev_warn(dev, "SSP clock desynchronized.\n");
+ if (!(read_SSCR0(reg) & SSCR0_SSE))
+ dev_warn(dev, "in SSCR0, SSP disabled.\n");
+
+ dev_dbg(dev, "SSP not ready, start CLK sync\n");
+
+ write_SSCR0(cr0 & ~SSCR0_SSE, reg);
+ write_SSPSP(0x02010007, reg);
+
+ write_SSTO(chip->timeout, reg);
+ write_SSCR0(cr0, reg);
+
+ /*
+ * This routine uses the DFx block to override the SSP inputs
+ * and outputs allowing us to bit bang SSPSCLK. On Langwell,
+ * we have to generate the clock to clear busy.
+ */
+ write_I2CDATA(0x3, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ write_I2CCTRL(0x01070034, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ write_I2CDATA(0x00000099, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ write_I2CCTRL(0x01070038, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ sssr = read_SSSR(reg);
+
+ /* Bit bang the clock until CSS clears */
+ while ((sssr & 0x400000) && (count < MAX_BITBANGING_LOOP)) {
+ write_I2CDATA(0x2, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ write_I2CCTRL(0x01070034, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ write_I2CDATA(0x3, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ write_I2CCTRL(0x01070034, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ sssr = read_SSSR(reg);
+ count++;
+ }
+ if (count >= MAX_BITBANGING_LOOP)
+ dev_err(dev,
+ "ERROR in %s : infinite loop on bit banging. Aborting\n",
+ __func__);
+
+ dev_dbg(dev, "---Bit bang count=%d\n", count);
+
+ write_I2CDATA(0x0, i2c_reg);
+ udelay(I2C_ACCESS_USDELAY);
+ write_I2CCTRL(0x01070038, i2c_reg);
+}
+
+static unsigned int ssp_get_clk_div(int speed)
+{
+ return max(100000000 / speed, 4) - 1;
+}
+
+/**
+ * intel_mid_ssp_spi_prepare_transfer() - Prepare for a SPI transfer
+ * @master: Pointer to the spi_master struct
+ */
+static int intel_mid_ssp_spi_prepare_transfer(struct spi_master *master)
+{
+ struct ssp_driver_context *drv_context = \
+ spi_master_get_devdata(master);
+
+ dev_dbg(&drv_context->pdev->dev, "prepare for spi transfer\n");
+
+ return 0;
+}
+
+/**
+ * intel_mid_ssp_spi_unprepare_transfer() - Prepare for a SPI transfer
+ * @master: Pointer to the spi_master struct
+ */
+static int intel_mid_ssp_spi_unprepare_transfer(struct spi_master *master)
+{
+ struct ssp_driver_context *drv_context = \
+ spi_master_get_devdata(master);
+
+ dev_dbg(&drv_context->pdev->dev, "unprepare for spi transfer\n");
+
+ return 0;
+}
+
+/**
+ * intel_mid_ssp_spi_transfer_one() - Start a SPI transfer
+ * @master: Pointer to the spi_master struct
+ * @msg: Pointer to the spi_message struct
+ */
+static int intel_mid_ssp_spi_transfer_one(struct spi_master *master, \
+ struct spi_message *msg)
+{
+ struct ssp_driver_context *drv_context = \
+ spi_master_get_devdata(master);
+ struct midssp_chip_data *chip = NULL;
+ struct spi_transfer *transfer = NULL;
+ void *reg = drv_context->ioaddr;
+ u32 cr1, ret;
+ struct device *dev = &drv_context->pdev->dev;
+ chip = spi_get_ctldata(msg->spi);
+
+ msg->actual_length = 0;
+ msg->status = -EINPROGRESS;
+ drv_context->cur_msg = msg;
+
+ /* We handle only one transfer message since the protocol module has to
+ control the out of band signaling. */
+ transfer = list_entry(msg->transfers.next,
+ struct spi_transfer,
+ transfer_list);
+
+ /* Check transfer length */
+ if (unlikely((transfer->len > MAX_SPI_TRANSFER_SIZE) ||
+ (transfer->len == 0))) {
+ dev_warn(dev, "transfer length null or greater than %d\n",
+ MAX_SPI_TRANSFER_SIZE);
+ dev_warn(dev, "length = %d\n", transfer->len);
+ msg->status = -EINVAL;
+
+ if (msg->complete)
+ msg->complete(msg->context);
+
+ return 0;
+ }
+
+ /* Flush any remaining data (in case of failed previous transfer) */
+ flush(drv_context);
+
+ drv_context->tx = (void *)transfer->tx_buf;
+ drv_context->rx = (void *)transfer->rx_buf;
+ drv_context->len = transfer->len;
+ drv_context->write = chip->write;
+ drv_context->read = chip->read;
+
+ if (likely(chip->dma_enabled)) {
+ drv_context->dma_mapped = map_dma_buffers(drv_context);
+ if (unlikely(!drv_context->dma_mapped))
+ return 0;
+ } else {
+ drv_context->write = drv_context->tx ?
+ chip->write : null_writer;
+ drv_context->read = drv_context->rx ?
+ chip->read : null_reader;
+ }
+ drv_context->tx_end = drv_context->tx + transfer->len;
+ drv_context->rx_end = drv_context->rx + transfer->len;
+
+ /* Clear status */
+ write_SSSR(drv_context->clear_sr, reg);
+
+ /* setup the CR1 control register */
+ cr1 = chip->cr1 | drv_context->cr1_sig;
+
+ if (likely(drv_context->quirks & QUIRKS_DMA_USE_NO_TRAIL)) {
+ /* in case of len smaller than burst size, adjust the RX */
+ /* threshold. All other cases will use the default threshold */
+ /* value. The RX fifo threshold must be aligned with the DMA */
+ /* RX transfer size, which may be limited to a multiple of 4 */
+ /* bytes due to 32bits DDR access. */
+ if (drv_context->len / drv_context->n_bytes <=
+ drv_context->rx_fifo_threshold) {
+ u32 rx_fifo_threshold;
+
+ rx_fifo_threshold = (drv_context->len & ~(4 - 1)) /
+ drv_context->n_bytes;
+ cr1 &= ~(SSCR1_RFT);
+ cr1 |= SSCR1_RxTresh(rx_fifo_threshold)
+ & SSCR1_RFT;
+ } else {
+ write_SSTO(chip->timeout, reg);
+ }
+ }
+
+ dev_dbg(dev,
+ "transfer len:%zd n_bytes:%d cr0:%x cr1:%x",
+ drv_context->len, drv_context->n_bytes, chip->cr0, cr1);
+
+ /* first set CR1 */
+ write_SSCR1(cr1, reg);
+
+ /* Do bitbanging only if SSP not-enabled or not-synchronized */
+ if (unlikely(((read_SSSR(reg) & SSP_NOT_SYNC) ||
+ (!(read_SSCR0(reg) & SSCR0_SSE))) &&
+ (drv_context->quirks & QUIRKS_BIT_BANGING))) {
+ start_bitbanging(drv_context);
+ } else {
+ /* (re)start the SSP */
+ write_SSCR0(chip->cr0, reg);
+ }
+
+ if (likely(chip->dma_enabled)) {
+ if (unlikely(drv_context->quirks & QUIRKS_USE_PM_QOS))
+ pm_qos_update_request(&drv_context->pm_qos_req,
+ MIN_EXIT_LATENCY);
+ dma_transfer(drv_context);
+ } else {
+ tasklet_schedule(&drv_context->poll_transfer);
+ }
+
+ ret = wait_for_completion_timeout(&drv_context->dma_done,
+ msecs_to_jiffies(SSP_SPI_DMA_TIMEOUT));
+ if (!ret) {
+ dev_err(dev, "DMA transfer timeout\n");
+ ret = -ETIMEDOUT;
+ return ret;
+ }
+
+ /* Handle completed message*/
+ int_transfer_complete(drv_context);
+
+ return 0;
+}
+
+/**
+ * setup() - Driver setup procedure
+ * @spi: Pointeur to the spi_device struct
+ */
+static int setup(struct spi_device *spi)
+{
+ struct intel_mid_ssp_spi_chip *chip_info = NULL;
+ struct midssp_chip_data *chip;
+ struct ssp_driver_context *drv_context =
+ spi_master_get_devdata(spi->master);
+ u32 tx_fifo_threshold;
+ u32 burst_size;
+ u32 clk_div;
+
+ if (!spi->bits_per_word)
+ spi->bits_per_word = DFLT_BITS_PER_WORD;
+
+ if ((spi->bits_per_word < MIN_BITS_PER_WORD
+ || spi->bits_per_word > MAX_BITS_PER_WORD))
+ return -EINVAL;
+
+ chip = spi_get_ctldata(spi);
+ if (!chip) {
+ chip = kzalloc(sizeof(struct midssp_chip_data), GFP_KERNEL);
+ if (!chip) {
+ dev_err(&spi->dev,
+ "failed setup: can't allocate chip data\n");
+ return -ENOMEM;
+ }
+ }
+ chip->cr0 = SSCR0_Motorola | SSCR0_DataSize(spi->bits_per_word > 16 ?
+ spi->bits_per_word - 16 : spi->bits_per_word)
+ | SSCR0_SSE
+ | (spi->bits_per_word > 16 ? SSCR0_EDSS : 0);
+
+ /* protocol drivers may change the chip settings, so... */
+ /* if chip_info exists, use it */
+ chip_info = spi->controller_data;
+
+ /* chip_info isn't always needed */
+ chip->cr1 = 0;
+ if (chip_info) {
+ burst_size = chip_info->burst_size;
+ if (burst_size > IMSS_FIFO_BURST_8)
+ burst_size = DFLT_FIFO_BURST_SIZE;
+
+ chip->timeout = chip_info->timeout;
+
+ if (chip_info->enable_loopback)
+ chip->cr1 |= SSCR1_LBM;
+
+ chip->dma_enabled = chip_info->dma_enabled;
+
+ } else {
+ /* if no chip_info provided by protocol driver, */
+ /* set default values */
+ dev_info(&spi->dev, "setting default chip values\n");
+
+ burst_size = DFLT_FIFO_BURST_SIZE;
+
+ chip->dma_enabled = 1;
+ if (drv_context->quirks & QUIRKS_DMA_USE_NO_TRAIL)
+ chip->timeout = 0;
+ else
+ chip->timeout = DFLT_TIMEOUT_VAL;
+ }
+ /* Set FIFO thresholds according to burst_size */
+ if (burst_size == IMSS_FIFO_BURST_8)
+ drv_context->rx_fifo_threshold = 8;
+ else if (burst_size == IMSS_FIFO_BURST_4)
+ drv_context->rx_fifo_threshold = 4;
+ else
+ drv_context->rx_fifo_threshold = 1;
+ tx_fifo_threshold = SPI_FIFO_SIZE - drv_context->rx_fifo_threshold;
+ chip->cr1 |= (SSCR1_RxTresh(drv_context->rx_fifo_threshold) &
+ SSCR1_RFT) | (SSCR1_TxTresh(tx_fifo_threshold) &
+ SSCR1_TFT);
+
+ drv_context->dma_mapped = 0;
+
+ /* setting phase and polarity. spi->mode comes from boardinfo */
+ if ((spi->mode & SPI_CPHA) != 0)
+ chip->cr1 |= SSCR1_SPH;
+ if ((spi->mode & SPI_CPOL) != 0)
+ chip->cr1 |= SSCR1_SPO;
+
+ if (drv_context->quirks & QUIRKS_SPI_SLAVE_CLOCK_MODE)
+ /* set slave mode */
+ chip->cr1 |= SSCR1_SCLKDIR | SSCR1_SFRMDIR;
+ chip->cr1 |= SSCR1_SCFR; /* clock is not free running */
+
+ dev_dbg(&spi->dev, "%d bits/word, mode %d\n",
+ spi->bits_per_word,
+ spi->mode & 0x3);
+ if (spi->bits_per_word <= 8) {
+ chip->n_bytes = 1;
+ chip->read = u8_reader;
+ chip->write = u8_writer;
+ } else if (spi->bits_per_word <= 16) {
+ chip->n_bytes = 2;
+ chip->read = u16_reader;
+ chip->write = u16_writer;
+ } else if (spi->bits_per_word <= 32) {
+ chip->cr0 |= SSCR0_EDSS;
+ chip->n_bytes = 4;
+ chip->read = u32_reader;
+ chip->write = u32_writer;
+ } else {
+ dev_err(&spi->dev, "invalid wordsize\n");
+ return -EINVAL;
+ }
+
+ if ((drv_context->quirks & QUIRKS_SPI_SLAVE_CLOCK_MODE) == 0) {
+ chip->speed_hz = spi->max_speed_hz;
+ clk_div = ssp_get_clk_div(chip->speed_hz);
+ chip->cr0 |= clk_div << 8;
+ }
+ chip->bits_per_word = spi->bits_per_word;
+
+ spi_set_ctldata(spi, chip);
+
+ /* setup of drv_context members that will not change across transfers */
+ drv_context->n_bytes = chip->n_bytes;
+
+ if (chip->dma_enabled) {
+ intel_mid_ssp_spi_dma_init(drv_context);
+ drv_context->cr1_sig = SSCR1_TSRE | SSCR1_RSRE;
+ drv_context->mask_sr = SSSR_ROR | SSSR_TUR;
+ if (drv_context->quirks & QUIRKS_DMA_USE_NO_TRAIL)
+ drv_context->cr1_sig |= SSCR1_TRAIL;
+ } else {
+ drv_context->cr1_sig = SSCR1_RIE | SSCR1_TIE | SSCR1_TINTE;
+ drv_context->mask_sr = SSSR_RFS | SSSR_TFS |
+ SSSR_ROR | SSSR_TUR | SSSR_TINT;
+ }
+ drv_context->clear_sr = SSSR_TUR | SSSR_ROR | SSSR_TINT;
+
+ return 0;
+}
+
+/**
+ * cleanup() - Driver cleanup procedure
+ * @spi: Pointer to the spi_device struct
+ */
+static void cleanup(struct spi_device *spi)
+{
+ struct midssp_chip_data *chip = spi_get_ctldata(spi);
+ struct ssp_driver_context *drv_context =
+ spi_master_get_devdata(spi->master);
+
+ if (drv_context->dma_initialized)
+ intel_mid_ssp_spi_dma_exit(drv_context);
+
+ /* Remove the PM_QOS request */
+ if (drv_context->quirks & QUIRKS_USE_PM_QOS)
+ pm_qos_remove_request(&drv_context->pm_qos_req);
+
+ kfree(chip);
+ spi_set_ctldata(spi, NULL);
+}
+
+/**
+ * intel_mid_ssp_spi_probe() - Driver probe procedure
+ * @pdev: Pointer to the pci_dev struct
+ * @ent: Pointer to the pci_device_id struct
+ */
+static int intel_mid_ssp_spi_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ struct device *dev = &pdev->dev;
+ struct spi_master *master;
+ struct ssp_driver_context *drv_context = 0;
+ int status;
+ u32 iolen = 0;
+ u8 ssp_cfg;
+ int pos;
+ void __iomem *syscfg_ioaddr;
+ unsigned long syscfg;
+
+ /* Check if the SSP we are probed for has been allocated */
+ /* to operate as SPI. This information is retreived from */
+ /* the field adid of the Vendor-Specific PCI capability */
+ /* which is used as a configuration register. */
+ pos = pci_find_capability(pdev, PCI_CAP_ID_VNDR);
+ if (pos > 0) {
+ pci_read_config_byte(pdev,
+ pos + VNDR_CAPABILITY_ADID_OFFSET,
+ &ssp_cfg);
+ } else {
+ dev_info(dev, "No Vendor Specific PCI capability\n");
+ goto err_abort_probe;
+ }
+
+ if (SSP_CFG_GET_MODE(ssp_cfg) != SSP_CFG_SPI_MODE_ID) {
+ dev_info(dev, "Unsupported SSP mode (%02xh)\n",
+ ssp_cfg);
+ goto err_abort_probe;
+ }
+
+ dev_info(dev, "found PCI SSP controller(ID: %04xh:%04xh cfg: %02xh)\n",
+ pdev->vendor, pdev->device, ssp_cfg);
+
+ status = pci_enable_device(pdev);
+ if (status)
+ return status;
+
+ /* Allocate Slave with space for drv_context and null dma buffer */
+ master = spi_alloc_master(dev, sizeof(struct ssp_driver_context));
+
+ if (!master) {
+ dev_err(dev, "cannot alloc spi_slave\n");
+ status = -ENOMEM;
+ goto err_free_0;
+ }
+
+ drv_context = spi_master_get_devdata(master);
+ drv_context->master = master;
+
+ drv_context->pdev = pdev;
+ drv_context->quirks = ent->driver_data;
+
+ /* Set platform & configuration quirks */
+ if (drv_context->quirks & QUIRKS_PLATFORM_MRST) {
+ /* Apply bit banging workarround on MRST */
+ drv_context->quirks |= QUIRKS_BIT_BANGING;
+ /* MRST slave mode workarrounds */
+ if (SSP_CFG_IS_SPI_SLAVE(ssp_cfg))
+ drv_context->quirks |=
+ QUIRKS_USE_PM_QOS |
+ QUIRKS_SRAM_ADDITIONAL_CPY;
+ }
+ drv_context->quirks |= QUIRKS_DMA_USE_NO_TRAIL;
+ if (SSP_CFG_IS_SPI_SLAVE(ssp_cfg))
+ drv_context->quirks |= QUIRKS_SPI_SLAVE_CLOCK_MODE;
+
+ master->mode_bits = SPI_CPOL | SPI_CPHA;
+ master->bus_num = SSP_CFG_GET_SPI_BUS_NB(ssp_cfg);
+ master->num_chipselect = 1;
+ master->cleanup = cleanup;
+ master->setup = setup;
+ master->prepare_transfer_hardware = intel_mid_ssp_spi_prepare_transfer;
+ master->unprepare_transfer_hardware = \
+ intel_mid_ssp_spi_unprepare_transfer;
+ master->transfer_one_message = intel_mid_ssp_spi_transfer_one;
+
+ drv_context->dma_initialized = 0;
+ init_completion(&drv_context->dma_done);
+
+ /* get basic io resource and map it */
+ drv_context->paddr = pci_resource_start(pdev, 0);
+ iolen = pci_resource_len(pdev, 0);
+
+ status = pci_request_region(pdev, 0, dev_name(&pdev->dev));
+ if (status)
+ goto err_free_1;
+
+ drv_context->ioaddr =
+ ioremap_nocache(drv_context->paddr, iolen);
+ if (!drv_context->ioaddr) {
+ status = -ENOMEM;
+ goto err_free_2;
+ }
+ dev_dbg(dev, "paddr = : %08lx", drv_context->paddr);
+ dev_dbg(dev, "ioaddr = : %p\n", drv_context->ioaddr);
+ dev_dbg(dev, "attaching to IRQ: %04x\n", pdev->irq);
+ dev_dbg(dev, "quirks = : %08lx\n", drv_context->quirks);
+
+ if (drv_context->quirks & QUIRKS_BIT_BANGING) {
+ /* Bit banging on the clock is done through */
+ /* DFT which is available through I2C. */
+ /* get base address of I2C_Serbus registers */
+ drv_context->I2C_paddr = 0xff12b000;
+ drv_context->I2C_ioaddr =
+ ioremap_nocache(drv_context->I2C_paddr, 0x10);
+ if (!drv_context->I2C_ioaddr) {
+ status = -ENOMEM;
+ goto err_free_3;
+ }
+ }
+
+ /* Attach to IRQ */
+ drv_context->irq = pdev->irq;
+ status = request_irq(drv_context->irq, ssp_int, IRQF_SHARED,
+ "intel_mid_ssp_spi", drv_context);
+ if (status < 0) {
+ dev_err(&pdev->dev, "can not get IRQ\n");
+ goto err_free_4;
+ }
+
+ if (drv_context->quirks & QUIRKS_PLATFORM_MDFL) {
+ /* get base address of DMA selector. */
+ syscfg = drv_context->paddr - SYSCFG;
+ syscfg_ioaddr = ioremap_nocache(syscfg, 0x10);
+ if (!syscfg_ioaddr) {
+ status = -ENOMEM;
+ goto err_free_5;
+ }
+ iowrite32(ioread32(syscfg_ioaddr) | 2, syscfg_ioaddr);
+ }
+
+ tasklet_init(&drv_context->poll_transfer, poll_transfer,
+ (unsigned long)drv_context);
+
+ /* Register with the SPI framework */
+ dev_info(dev, "register with SPI framework (bus spi%d)\n",
+ master->bus_num);
+
+ status = spi_register_master(master);
+
+ if (status != 0) {
+ dev_err(dev, "problem registering spi\n");
+ goto err_free_5;
+ }
+
+ pci_set_drvdata(pdev, drv_context);
+
+ /* Create the PM_QOS request */
+ if (drv_context->quirks & QUIRKS_USE_PM_QOS)
+ pm_qos_add_request(&drv_context->pm_qos_req,
+ PM_QOS_CPU_DMA_LATENCY,
+ PM_QOS_DEFAULT_VALUE);
+
+ return status;
+
+err_free_5:
+ free_irq(drv_context->irq, drv_context);
+err_free_4:
+ iounmap(drv_context->I2C_ioaddr);
+err_free_3:
+ iounmap(drv_context->ioaddr);
+err_free_2:
+ pci_release_region(pdev, 0);
+err_free_1:
+ spi_master_put(master);
+err_free_0:
+ pci_disable_device(pdev);
+
+ return status;
+err_abort_probe:
+ dev_info(dev, "Abort probe for SSP %04xh:%04xh\n",
+ pdev->vendor, pdev->device);
+ return -ENODEV;
+}
+
+/**
+ * intel_mid_ssp_spi_remove() - driver remove procedure
+ * @pdev: Pointer to the pci_dev struct
+ */
+static void __devexit intel_mid_ssp_spi_remove(struct pci_dev *pdev)
+{
+ struct ssp_driver_context *drv_context = pci_get_drvdata(pdev);
+
+ if (!drv_context)
+ return;
+
+ /* Release IRQ */
+ free_irq(drv_context->irq, drv_context);
+
+ iounmap(drv_context->ioaddr);
+ if (drv_context->quirks & QUIRKS_BIT_BANGING)
+ iounmap(drv_context->I2C_ioaddr);
+
+ /* disconnect from the SPI framework */
+ spi_unregister_master(drv_context->master);
+
+ pci_set_drvdata(pdev, NULL);
+ pci_release_region(pdev, 0);
+ pci_disable_device(pdev);
+
+ return;
+}
+
+#ifdef CONFIG_PM
+/**
+ * intel_mid_ssp_spi_suspend() - Driver suspend procedure
+ * @pdev: Pointer to the pci_dev struct
+ * @state: pm_message_t
+ */
+static int intel_mid_ssp_spi_suspend(struct pci_dev *pdev, pm_message_t state)
+{
+ struct ssp_driver_context *drv_context = pci_get_drvdata(pdev);
+ dev_dbg(&pdev->dev, "suspend\n");
+
+ tasklet_disable(&drv_context->poll_transfer);
+
+ return 0;
+}
+
+/**
+ * intel_mid_ssp_spi_resume() - Driver resume procedure
+ * @pdev: Pointer to the pci_dev struct
+ */
+static int intel_mid_ssp_spi_resume(struct pci_dev *pdev)
+{
+ struct ssp_driver_context *drv_context = pci_get_drvdata(pdev);
+ dev_dbg(&pdev->dev, "resume\n");
+
+ tasklet_enable(&drv_context->poll_transfer);
+
+ return 0;
+}
+#else
+#define intel_mid_ssp_spi_suspend NULL
+#define intel_mid_ssp_spi_resume NULL
+#endif /* CONFIG_PM */
+
+
+static const struct pci_device_id midssp_pci_ids[] __devinitdata = {
+ /* MRST SSP0 */
+ { PCI_VDEVICE(INTEL, 0x0815), QUIRKS_PLATFORM_MRST},
+ /* MDFL SSP0 */
+ { PCI_VDEVICE(INTEL, 0x0832), QUIRKS_PLATFORM_MDFL},
+ /* MDFL SSP1 */
+ { PCI_VDEVICE(INTEL, 0x0825), QUIRKS_PLATFORM_MDFL},
+ /* MDFL SSP3 */
+ { PCI_VDEVICE(INTEL, 0x0816), QUIRKS_PLATFORM_MDFL},
+ /* MRFL SSP5 */
+ { PCI_VDEVICE(INTEL, 0x1194), 0},
+ {},
+};
+
+static struct pci_driver intel_mid_ssp_spi_driver = {
+ .name = "intel_mid_ssp_spi_unified",
+ .id_table = midssp_pci_ids,
+ .probe = intel_mid_ssp_spi_probe,
+ .remove = __devexit_p(intel_mid_ssp_spi_remove),
+ .suspend = intel_mid_ssp_spi_suspend,
+ .resume = intel_mid_ssp_spi_resume,
+};
+
+static int __init intel_mid_ssp_spi_init(void)
+{
+ return pci_register_driver(&intel_mid_ssp_spi_driver);
+}
+
+late_initcall(intel_mid_ssp_spi_init);
+
+static void __exit intel_mid_ssp_spi_exit(void)
+{
+ pci_unregister_driver(&intel_mid_ssp_spi_driver);
+}
+
+module_exit(intel_mid_ssp_spi_exit);
+
diff --git a/include/linux/spi/spi-intel-mid-ssp.h b/include/linux/spi/spi-intel-mid-ssp.h
new file mode 100644
index 0000000..69545b9
--- /dev/null
+++ b/include/linux/spi/spi-intel-mid-ssp.h
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) Intel 2009
+ * Ken Mills <ken.k.mills@xxxxxxxxx>
+ * Sylvain Centelles <sylvain.centelles@xxxxxxxxx>
+ * Jun Chen <jun.d.chen@xxxxxxxxx>
+ * Chao Bi <chao.bi@xxxxxxxxx>
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *
+ */
+#ifndef INTEL_MID_SSP_SPI_H_
+#define INTEL_MID_SSP_SPI_H_
+#include <linux/pci.h>
+#include <linux/spi/spi.h>
+
+struct callback_param {
+ void *drv_context;
+ u32 direction;
+};
+
+struct ssp_driver_context {
+ /* Driver model hookup */
+ struct pci_dev *pdev;
+
+ /* SPI framework hookup */
+ struct spi_master *master;
+
+ /* SSP register addresses */
+ unsigned long paddr;
+ void *ioaddr;
+ int irq;
+
+ /* I2C registers */
+ dma_addr_t I2C_paddr;
+ void *I2C_ioaddr;
+
+ /* SSP masks*/
+ u32 cr1_sig;
+ u32 cr1;
+ u32 clear_sr;
+ u32 mask_sr;
+
+ /* PM_QOS request */
+ struct pm_qos_request pm_qos_req;
+
+ struct tasklet_struct poll_transfer;
+
+ spinlock_t lock;
+
+ /* Current message transfer state info */
+ struct spi_message *cur_msg;
+ size_t len;
+ size_t len_dma_rx;
+ size_t len_dma_tx;
+ void *tx;
+ void *tx_end;
+ void *rx;
+ void *rx_end;
+ bool dma_initialized;
+ int dma_mapped;
+ dma_addr_t rx_dma;
+ dma_addr_t tx_dma;
+ u8 n_bytes;
+ int (*write)(struct ssp_driver_context *drv_context);
+ int (*read)(struct ssp_driver_context *drv_context);
+
+ struct intel_mid_dma_slave dmas_tx;
+ struct intel_mid_dma_slave dmas_rx;
+ struct dma_chan *txchan;
+ struct dma_chan *rxchan;
+
+ u8 __iomem *virt_addr_sram_tx;
+ u8 __iomem *virt_addr_sram_rx;
+
+ int txdma_done;
+ int rxdma_done;
+ struct callback_param tx_param;
+ struct callback_param rx_param;
+ struct pci_dev *dmac1;
+
+ unsigned long quirks;
+ u32 rx_fifo_threshold;
+
+ struct completion dma_done;
+};
+
+#endif /*INTEL_MID_SSP_SPI_H_*/
--
1.7.1
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