+++ /dev/null
-From 24884115a6029995dba2561b1ee810f28a34271a Mon Sep 17 00:00:00 2001
-From: "Ivan T. Ivanov" <iivanov@mm-sol.com>
-Date: Thu, 13 Feb 2014 18:21:38 +0200
-Subject: [PATCH 065/182] spi: Add Qualcomm QUP SPI controller support
-
-Qualcomm Universal Peripheral (QUP) core is an AHB slave that
-provides a common data path (an output FIFO and an input FIFO)
-for serial peripheral interface (SPI) mini-core. SPI in master
-mode supports up to 50MHz, up to four chip selects, programmable
-data path from 4 bits to 32 bits and numerous protocol variants.
-
-Cc: Alok Chauhan <alokc@codeaurora.org>
-Cc: Gilad Avidov <gavidov@codeaurora.org>
-Cc: Kiran Gunda <kgunda@codeaurora.org>
-Cc: Sagar Dharia <sdharia@codeaurora.org>
-Cc: dsneddon@codeaurora.org
-Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
-Signed-off-by: Mark Brown <broonie@linaro.org>
----
- drivers/spi/Kconfig | 13 +
- drivers/spi/Makefile | 1 +
- drivers/spi/spi-qup.c | 837 +++++++++++++++++++++++++++++++++++++++++++++++++
- 3 files changed, 851 insertions(+)
- create mode 100644 drivers/spi/spi-qup.c
-
---- a/drivers/spi/Kconfig
-+++ b/drivers/spi/Kconfig
-@@ -390,6 +390,19 @@ config SPI_RSPI
- help
- SPI driver for Renesas RSPI and QSPI blocks.
-
-+config SPI_QUP
-+ tristate "Qualcomm SPI controller with QUP interface"
-+ depends on ARCH_MSM_DT
-+ help
-+ Qualcomm Universal Peripheral (QUP) core is an AHB slave that
-+ provides a common data path (an output FIFO and an input FIFO)
-+ for serial peripheral interface (SPI) mini-core. SPI in master
-+ mode supports up to 50MHz, up to four chip selects, programmable
-+ data path from 4 bits to 32 bits and numerous protocol variants.
-+
-+ This driver can also be built as a module. If so, the module
-+ will be called spi_qup.
-+
- config SPI_S3C24XX
- tristate "Samsung S3C24XX series SPI"
- depends on ARCH_S3C24XX
---- a/drivers/spi/Makefile
-+++ b/drivers/spi/Makefile
-@@ -60,6 +60,7 @@ spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_
- spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_DMA) += spi-pxa2xx-dma.o
- obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx-platform.o
- obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o
-+obj-$(CONFIG_SPI_QUP) += spi-qup.o
- obj-$(CONFIG_SPI_RSPI) += spi-rspi.o
- obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o
- spi-s3c24xx-hw-y := spi-s3c24xx.o
---- /dev/null
-+++ b/drivers/spi/spi-qup.c
-@@ -0,0 +1,837 @@
-+/*
-+ * Copyright (c) 2008-2014, The Linux foundation. All rights reserved.
-+ *
-+ * This program is free software; you can redistribute it and/or modify
-+ * it under the terms of the GNU General Public License rev 2 and
-+ * only rev 2 as published by the free Software foundation.
-+ *
-+ * 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.
-+ */
-+
-+#include <linux/clk.h>
-+#include <linux/delay.h>
-+#include <linux/err.h>
-+#include <linux/interrupt.h>
-+#include <linux/io.h>
-+#include <linux/list.h>
-+#include <linux/module.h>
-+#include <linux/of.h>
-+#include <linux/platform_device.h>
-+#include <linux/pm_runtime.h>
-+#include <linux/spi/spi.h>
-+
-+#define QUP_CONFIG 0x0000
-+#define QUP_STATE 0x0004
-+#define QUP_IO_M_MODES 0x0008
-+#define QUP_SW_RESET 0x000c
-+#define QUP_OPERATIONAL 0x0018
-+#define QUP_ERROR_FLAGS 0x001c
-+#define QUP_ERROR_FLAGS_EN 0x0020
-+#define QUP_OPERATIONAL_MASK 0x0028
-+#define QUP_HW_VERSION 0x0030
-+#define QUP_MX_OUTPUT_CNT 0x0100
-+#define QUP_OUTPUT_FIFO 0x0110
-+#define QUP_MX_WRITE_CNT 0x0150
-+#define QUP_MX_INPUT_CNT 0x0200
-+#define QUP_MX_READ_CNT 0x0208
-+#define QUP_INPUT_FIFO 0x0218
-+
-+#define SPI_CONFIG 0x0300
-+#define SPI_IO_CONTROL 0x0304
-+#define SPI_ERROR_FLAGS 0x0308
-+#define SPI_ERROR_FLAGS_EN 0x030c
-+
-+/* QUP_CONFIG fields */
-+#define QUP_CONFIG_SPI_MODE (1 << 8)
-+#define QUP_CONFIG_CLOCK_AUTO_GATE BIT(13)
-+#define QUP_CONFIG_NO_INPUT BIT(7)
-+#define QUP_CONFIG_NO_OUTPUT BIT(6)
-+#define QUP_CONFIG_N 0x001f
-+
-+/* QUP_STATE fields */
-+#define QUP_STATE_VALID BIT(2)
-+#define QUP_STATE_RESET 0
-+#define QUP_STATE_RUN 1
-+#define QUP_STATE_PAUSE 3
-+#define QUP_STATE_MASK 3
-+#define QUP_STATE_CLEAR 2
-+
-+#define QUP_HW_VERSION_2_1_1 0x20010001
-+
-+/* QUP_IO_M_MODES fields */
-+#define QUP_IO_M_PACK_EN BIT(15)
-+#define QUP_IO_M_UNPACK_EN BIT(14)
-+#define QUP_IO_M_INPUT_MODE_MASK_SHIFT 12
-+#define QUP_IO_M_OUTPUT_MODE_MASK_SHIFT 10
-+#define QUP_IO_M_INPUT_MODE_MASK (3 << QUP_IO_M_INPUT_MODE_MASK_SHIFT)
-+#define QUP_IO_M_OUTPUT_MODE_MASK (3 << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT)
-+
-+#define QUP_IO_M_OUTPUT_BLOCK_SIZE(x) (((x) & (0x03 << 0)) >> 0)
-+#define QUP_IO_M_OUTPUT_FIFO_SIZE(x) (((x) & (0x07 << 2)) >> 2)
-+#define QUP_IO_M_INPUT_BLOCK_SIZE(x) (((x) & (0x03 << 5)) >> 5)
-+#define QUP_IO_M_INPUT_FIFO_SIZE(x) (((x) & (0x07 << 7)) >> 7)
-+
-+#define QUP_IO_M_MODE_FIFO 0
-+#define QUP_IO_M_MODE_BLOCK 1
-+#define QUP_IO_M_MODE_DMOV 2
-+#define QUP_IO_M_MODE_BAM 3
-+
-+/* QUP_OPERATIONAL fields */
-+#define QUP_OP_MAX_INPUT_DONE_FLAG BIT(11)
-+#define QUP_OP_MAX_OUTPUT_DONE_FLAG BIT(10)
-+#define QUP_OP_IN_SERVICE_FLAG BIT(9)
-+#define QUP_OP_OUT_SERVICE_FLAG BIT(8)
-+#define QUP_OP_IN_FIFO_FULL BIT(7)
-+#define QUP_OP_OUT_FIFO_FULL BIT(6)
-+#define QUP_OP_IN_FIFO_NOT_EMPTY BIT(5)
-+#define QUP_OP_OUT_FIFO_NOT_EMPTY BIT(4)
-+
-+/* QUP_ERROR_FLAGS and QUP_ERROR_FLAGS_EN fields */
-+#define QUP_ERROR_OUTPUT_OVER_RUN BIT(5)
-+#define QUP_ERROR_INPUT_UNDER_RUN BIT(4)
-+#define QUP_ERROR_OUTPUT_UNDER_RUN BIT(3)
-+#define QUP_ERROR_INPUT_OVER_RUN BIT(2)
-+
-+/* SPI_CONFIG fields */
-+#define SPI_CONFIG_HS_MODE BIT(10)
-+#define SPI_CONFIG_INPUT_FIRST BIT(9)
-+#define SPI_CONFIG_LOOPBACK BIT(8)
-+
-+/* SPI_IO_CONTROL fields */
-+#define SPI_IO_C_FORCE_CS BIT(11)
-+#define SPI_IO_C_CLK_IDLE_HIGH BIT(10)
-+#define SPI_IO_C_MX_CS_MODE BIT(8)
-+#define SPI_IO_C_CS_N_POLARITY_0 BIT(4)
-+#define SPI_IO_C_CS_SELECT(x) (((x) & 3) << 2)
-+#define SPI_IO_C_CS_SELECT_MASK 0x000c
-+#define SPI_IO_C_TRISTATE_CS BIT(1)
-+#define SPI_IO_C_NO_TRI_STATE BIT(0)
-+
-+/* SPI_ERROR_FLAGS and SPI_ERROR_FLAGS_EN fields */
-+#define SPI_ERROR_CLK_OVER_RUN BIT(1)
-+#define SPI_ERROR_CLK_UNDER_RUN BIT(0)
-+
-+#define SPI_NUM_CHIPSELECTS 4
-+
-+/* high speed mode is when bus rate is greater then 26MHz */
-+#define SPI_HS_MIN_RATE 26000000
-+#define SPI_MAX_RATE 50000000
-+
-+#define SPI_DELAY_THRESHOLD 1
-+#define SPI_DELAY_RETRY 10
-+
-+struct spi_qup_device {
-+ int select;
-+ u16 mode;
-+};
-+
-+struct spi_qup {
-+ void __iomem *base;
-+ struct device *dev;
-+ struct clk *cclk; /* core clock */
-+ struct clk *iclk; /* interface clock */
-+ int irq;
-+ u32 max_speed_hz;
-+ spinlock_t lock;
-+
-+ int in_fifo_sz;
-+ int out_fifo_sz;
-+ int in_blk_sz;
-+ int out_blk_sz;
-+
-+ struct spi_transfer *xfer;
-+ struct completion done;
-+ int error;
-+ int w_size; /* bytes per SPI word */
-+ int tx_bytes;
-+ int rx_bytes;
-+};
-+
-+
-+static inline bool spi_qup_is_valid_state(struct spi_qup *controller)
-+{
-+ u32 opstate = readl_relaxed(controller->base + QUP_STATE);
-+
-+ return opstate & QUP_STATE_VALID;
-+}
-+
-+static int spi_qup_set_state(struct spi_qup *controller, u32 state)
-+{
-+ unsigned long loop;
-+ u32 cur_state;
-+
-+ loop = 0;
-+ while (!spi_qup_is_valid_state(controller)) {
-+
-+ usleep_range(SPI_DELAY_THRESHOLD, SPI_DELAY_THRESHOLD * 2);
-+
-+ if (++loop > SPI_DELAY_RETRY)
-+ return -EIO;
-+ }
-+
-+ if (loop)
-+ dev_dbg(controller->dev, "invalid state for %ld,us %d\n",
-+ loop, state);
-+
-+ cur_state = readl_relaxed(controller->base + QUP_STATE);
-+ /*
-+ * Per spec: for PAUSE_STATE to RESET_STATE, two writes
-+ * of (b10) are required
-+ */
-+ if (((cur_state & QUP_STATE_MASK) == QUP_STATE_PAUSE) &&
-+ (state == QUP_STATE_RESET)) {
-+ writel_relaxed(QUP_STATE_CLEAR, controller->base + QUP_STATE);
-+ writel_relaxed(QUP_STATE_CLEAR, controller->base + QUP_STATE);
-+ } else {
-+ cur_state &= ~QUP_STATE_MASK;
-+ cur_state |= state;
-+ writel_relaxed(cur_state, controller->base + QUP_STATE);
-+ }
-+
-+ loop = 0;
-+ while (!spi_qup_is_valid_state(controller)) {
-+
-+ usleep_range(SPI_DELAY_THRESHOLD, SPI_DELAY_THRESHOLD * 2);
-+
-+ if (++loop > SPI_DELAY_RETRY)
-+ return -EIO;
-+ }
-+
-+ return 0;
-+}
-+
-+
-+static void spi_qup_fifo_read(struct spi_qup *controller,
-+ struct spi_transfer *xfer)
-+{
-+ u8 *rx_buf = xfer->rx_buf;
-+ u32 word, state;
-+ int idx, shift, w_size;
-+
-+ w_size = controller->w_size;
-+
-+ while (controller->rx_bytes < xfer->len) {
-+
-+ state = readl_relaxed(controller->base + QUP_OPERATIONAL);
-+ if (0 == (state & QUP_OP_IN_FIFO_NOT_EMPTY))
-+ break;
-+
-+ word = readl_relaxed(controller->base + QUP_INPUT_FIFO);
-+
-+ if (!rx_buf) {
-+ controller->rx_bytes += w_size;
-+ continue;
-+ }
-+
-+ for (idx = 0; idx < w_size; idx++, controller->rx_bytes++) {
-+ /*
-+ * The data format depends on bytes per SPI word:
-+ * 4 bytes: 0x12345678
-+ * 2 bytes: 0x00001234
-+ * 1 byte : 0x00000012
-+ */
-+ shift = BITS_PER_BYTE;
-+ shift *= (w_size - idx - 1);
-+ rx_buf[controller->rx_bytes] = word >> shift;
-+ }
-+ }
-+}
-+
-+static void spi_qup_fifo_write(struct spi_qup *controller,
-+ struct spi_transfer *xfer)
-+{
-+ const u8 *tx_buf = xfer->tx_buf;
-+ u32 word, state, data;
-+ int idx, w_size;
-+
-+ w_size = controller->w_size;
-+
-+ while (controller->tx_bytes < xfer->len) {
-+
-+ state = readl_relaxed(controller->base + QUP_OPERATIONAL);
-+ if (state & QUP_OP_OUT_FIFO_FULL)
-+ break;
-+
-+ word = 0;
-+ for (idx = 0; idx < w_size; idx++, controller->tx_bytes++) {
-+
-+ if (!tx_buf) {
-+ controller->tx_bytes += w_size;
-+ break;
-+ }
-+
-+ data = tx_buf[controller->tx_bytes];
-+ word |= data << (BITS_PER_BYTE * (3 - idx));
-+ }
-+
-+ writel_relaxed(word, controller->base + QUP_OUTPUT_FIFO);
-+ }
-+}
-+
-+static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
-+{
-+ struct spi_qup *controller = dev_id;
-+ struct spi_transfer *xfer;
-+ u32 opflags, qup_err, spi_err;
-+ unsigned long flags;
-+ int error = 0;
-+
-+ spin_lock_irqsave(&controller->lock, flags);
-+ xfer = controller->xfer;
-+ controller->xfer = NULL;
-+ spin_unlock_irqrestore(&controller->lock, flags);
-+
-+ qup_err = readl_relaxed(controller->base + QUP_ERROR_FLAGS);
-+ spi_err = readl_relaxed(controller->base + SPI_ERROR_FLAGS);
-+ opflags = readl_relaxed(controller->base + QUP_OPERATIONAL);
-+
-+ writel_relaxed(qup_err, controller->base + QUP_ERROR_FLAGS);
-+ writel_relaxed(spi_err, controller->base + SPI_ERROR_FLAGS);
-+ writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
-+
-+ if (!xfer) {
-+ dev_err_ratelimited(controller->dev, "unexpected irq %x08 %x08 %x08\n",
-+ qup_err, spi_err, opflags);
-+ return IRQ_HANDLED;
-+ }
-+
-+ if (qup_err) {
-+ if (qup_err & QUP_ERROR_OUTPUT_OVER_RUN)
-+ dev_warn(controller->dev, "OUTPUT_OVER_RUN\n");
-+ if (qup_err & QUP_ERROR_INPUT_UNDER_RUN)
-+ dev_warn(controller->dev, "INPUT_UNDER_RUN\n");
-+ if (qup_err & QUP_ERROR_OUTPUT_UNDER_RUN)
-+ dev_warn(controller->dev, "OUTPUT_UNDER_RUN\n");
-+ if (qup_err & QUP_ERROR_INPUT_OVER_RUN)
-+ dev_warn(controller->dev, "INPUT_OVER_RUN\n");
-+
-+ error = -EIO;
-+ }
-+
-+ if (spi_err) {
-+ if (spi_err & SPI_ERROR_CLK_OVER_RUN)
-+ dev_warn(controller->dev, "CLK_OVER_RUN\n");
-+ if (spi_err & SPI_ERROR_CLK_UNDER_RUN)
-+ dev_warn(controller->dev, "CLK_UNDER_RUN\n");
-+
-+ error = -EIO;
-+ }
-+
-+ if (opflags & QUP_OP_IN_SERVICE_FLAG)
-+ spi_qup_fifo_read(controller, xfer);
-+
-+ if (opflags & QUP_OP_OUT_SERVICE_FLAG)
-+ spi_qup_fifo_write(controller, xfer);
-+
-+ spin_lock_irqsave(&controller->lock, flags);
-+ controller->error = error;
-+ controller->xfer = xfer;
-+ spin_unlock_irqrestore(&controller->lock, flags);
-+
-+ if (controller->rx_bytes == xfer->len || error)
-+ complete(&controller->done);
-+
-+ return IRQ_HANDLED;
-+}
-+
-+
-+/* set clock freq ... bits per word */
-+static int spi_qup_io_config(struct spi_qup *controller,
-+ struct spi_qup_device *chip,
-+ struct spi_transfer *xfer)
-+{
-+ u32 config, iomode, mode;
-+ int ret, n_words, w_size;
-+
-+ if (chip->mode & SPI_LOOP && xfer->len > controller->in_fifo_sz) {
-+ dev_err(controller->dev, "too big size for loopback %d > %d\n",
-+ xfer->len, controller->in_fifo_sz);
-+ return -EIO;
-+ }
-+
-+ ret = clk_set_rate(controller->cclk, xfer->speed_hz);
-+ if (ret) {
-+ dev_err(controller->dev, "fail to set frequency %d",
-+ xfer->speed_hz);
-+ return -EIO;
-+ }
-+
-+ if (spi_qup_set_state(controller, QUP_STATE_RESET)) {
-+ dev_err(controller->dev, "cannot set RESET state\n");
-+ return -EIO;
-+ }
-+
-+ w_size = 4;
-+ if (xfer->bits_per_word <= 8)
-+ w_size = 1;
-+ else if (xfer->bits_per_word <= 16)
-+ w_size = 2;
-+
-+ n_words = xfer->len / w_size;
-+ controller->w_size = w_size;
-+
-+ if (n_words <= controller->in_fifo_sz) {
-+ mode = QUP_IO_M_MODE_FIFO;
-+ writel_relaxed(n_words, controller->base + QUP_MX_READ_CNT);
-+ writel_relaxed(n_words, controller->base + QUP_MX_WRITE_CNT);
-+ /* must be zero for FIFO */
-+ writel_relaxed(0, controller->base + QUP_MX_INPUT_CNT);
-+ writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
-+ } else {
-+ mode = QUP_IO_M_MODE_BLOCK;
-+ writel_relaxed(n_words, controller->base + QUP_MX_INPUT_CNT);
-+ writel_relaxed(n_words, controller->base + QUP_MX_OUTPUT_CNT);
-+ /* must be zero for BLOCK and BAM */
-+ writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
-+ writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
-+ }
-+
-+ iomode = readl_relaxed(controller->base + QUP_IO_M_MODES);
-+ /* Set input and output transfer mode */
-+ iomode &= ~(QUP_IO_M_INPUT_MODE_MASK | QUP_IO_M_OUTPUT_MODE_MASK);
-+ iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN);
-+ iomode |= (mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT);
-+ iomode |= (mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT);
-+
-+ writel_relaxed(iomode, controller->base + QUP_IO_M_MODES);
-+
-+ config = readl_relaxed(controller->base + SPI_CONFIG);
-+
-+ if (chip->mode & SPI_LOOP)
-+ config |= SPI_CONFIG_LOOPBACK;
-+ else
-+ config &= ~SPI_CONFIG_LOOPBACK;
-+
-+ if (chip->mode & SPI_CPHA)
-+ config &= ~SPI_CONFIG_INPUT_FIRST;
-+ else
-+ config |= SPI_CONFIG_INPUT_FIRST;
-+
-+ /*
-+ * HS_MODE improves signal stability for spi-clk high rates,
-+ * but is invalid in loop back mode.
-+ */
-+ if ((xfer->speed_hz >= SPI_HS_MIN_RATE) && !(chip->mode & SPI_LOOP))
-+ config |= SPI_CONFIG_HS_MODE;
-+ else
-+ config &= ~SPI_CONFIG_HS_MODE;
-+
-+ writel_relaxed(config, controller->base + SPI_CONFIG);
-+
-+ config = readl_relaxed(controller->base + QUP_CONFIG);
-+ config &= ~(QUP_CONFIG_NO_INPUT | QUP_CONFIG_NO_OUTPUT | QUP_CONFIG_N);
-+ config |= xfer->bits_per_word - 1;
-+ config |= QUP_CONFIG_SPI_MODE;
-+ writel_relaxed(config, controller->base + QUP_CONFIG);
-+
-+ writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
-+ return 0;
-+}
-+
-+static void spi_qup_set_cs(struct spi_device *spi, bool enable)
-+{
-+ struct spi_qup *controller = spi_master_get_devdata(spi->master);
-+ struct spi_qup_device *chip = spi_get_ctldata(spi);
-+
-+ u32 iocontol, mask;
-+
-+ iocontol = readl_relaxed(controller->base + SPI_IO_CONTROL);
-+
-+ /* Disable auto CS toggle and use manual */
-+ iocontol &= ~SPI_IO_C_MX_CS_MODE;
-+ iocontol |= SPI_IO_C_FORCE_CS;
-+
-+ iocontol &= ~SPI_IO_C_CS_SELECT_MASK;
-+ iocontol |= SPI_IO_C_CS_SELECT(chip->select);
-+
-+ mask = SPI_IO_C_CS_N_POLARITY_0 << chip->select;
-+
-+ if (enable)
-+ iocontol |= mask;
-+ else
-+ iocontol &= ~mask;
-+
-+ writel_relaxed(iocontol, controller->base + SPI_IO_CONTROL);
-+}
-+
-+static int spi_qup_transfer_one(struct spi_master *master,
-+ struct spi_device *spi,
-+ struct spi_transfer *xfer)
-+{
-+ struct spi_qup *controller = spi_master_get_devdata(master);
-+ struct spi_qup_device *chip = spi_get_ctldata(spi);
-+ unsigned long timeout, flags;
-+ int ret = -EIO;
-+
-+ ret = spi_qup_io_config(controller, chip, xfer);
-+ if (ret)
-+ return ret;
-+
-+ timeout = DIV_ROUND_UP(xfer->speed_hz, MSEC_PER_SEC);
-+ timeout = DIV_ROUND_UP(xfer->len * 8, timeout);
-+ timeout = 100 * msecs_to_jiffies(timeout);
-+
-+ reinit_completion(&controller->done);
-+
-+ spin_lock_irqsave(&controller->lock, flags);
-+ controller->xfer = xfer;
-+ controller->error = 0;
-+ controller->rx_bytes = 0;
-+ controller->tx_bytes = 0;
-+ spin_unlock_irqrestore(&controller->lock, flags);
-+
-+ if (spi_qup_set_state(controller, QUP_STATE_RUN)) {
-+ dev_warn(controller->dev, "cannot set RUN state\n");
-+ goto exit;
-+ }
-+
-+ if (spi_qup_set_state(controller, QUP_STATE_PAUSE)) {
-+ dev_warn(controller->dev, "cannot set PAUSE state\n");
-+ goto exit;
-+ }
-+
-+ spi_qup_fifo_write(controller, xfer);
-+
-+ if (spi_qup_set_state(controller, QUP_STATE_RUN)) {
-+ dev_warn(controller->dev, "cannot set EXECUTE state\n");
-+ goto exit;
-+ }
-+
-+ if (!wait_for_completion_timeout(&controller->done, timeout))
-+ ret = -ETIMEDOUT;
-+exit:
-+ spi_qup_set_state(controller, QUP_STATE_RESET);
-+ spin_lock_irqsave(&controller->lock, flags);
-+ controller->xfer = NULL;
-+ if (!ret)
-+ ret = controller->error;
-+ spin_unlock_irqrestore(&controller->lock, flags);
-+ return ret;
-+}
-+
-+static int spi_qup_setup(struct spi_device *spi)
-+{
-+ struct spi_qup *controller = spi_master_get_devdata(spi->master);
-+ struct spi_qup_device *chip = spi_get_ctldata(spi);
-+
-+ if (spi->chip_select >= spi->master->num_chipselect) {
-+ dev_err(controller->dev, "invalid chip_select %d\n",
-+ spi->chip_select);
-+ return -EINVAL;
-+ }
-+
-+ if (spi->max_speed_hz > controller->max_speed_hz) {
-+ dev_err(controller->dev, "invalid max_speed_hz %d\n",
-+ spi->max_speed_hz);
-+ return -EINVAL;
-+ }
-+
-+ if (!chip) {
-+ /* First setup */
-+ chip = kzalloc(sizeof(*chip), GFP_KERNEL);
-+ if (!chip) {
-+ dev_err(controller->dev, "no memory for chip data\n");
-+ return -ENOMEM;
-+ }
-+
-+ chip->mode = spi->mode;
-+ chip->select = spi->chip_select;
-+ spi_set_ctldata(spi, chip);
-+ }
-+
-+ return 0;
-+}
-+
-+static void spi_qup_cleanup(struct spi_device *spi)
-+{
-+ struct spi_qup_device *chip = spi_get_ctldata(spi);
-+
-+ if (!chip)
-+ return;
-+
-+ spi_set_ctldata(spi, NULL);
-+ kfree(chip);
-+}
-+
-+static int spi_qup_probe(struct platform_device *pdev)
-+{
-+ struct spi_master *master;
-+ struct clk *iclk, *cclk;
-+ struct spi_qup *controller;
-+ struct resource *res;
-+ struct device *dev;
-+ void __iomem *base;
-+ u32 data, max_freq, iomode;
-+ int ret, irq, size;
-+
-+ dev = &pdev->dev;
-+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-+ base = devm_ioremap_resource(dev, res);
-+ if (IS_ERR(base))
-+ return PTR_ERR(base);
-+
-+ irq = platform_get_irq(pdev, 0);
-+
-+ if (irq < 0)
-+ return irq;
-+
-+ cclk = devm_clk_get(dev, "core");
-+ if (IS_ERR(cclk))
-+ return PTR_ERR(cclk);
-+
-+ iclk = devm_clk_get(dev, "iface");
-+ if (IS_ERR(iclk))
-+ return PTR_ERR(iclk);
-+
-+ /* This is optional parameter */
-+ if (of_property_read_u32(dev->of_node, "spi-max-frequency", &max_freq))
-+ max_freq = SPI_MAX_RATE;
-+
-+ if (!max_freq || max_freq > SPI_MAX_RATE) {
-+ dev_err(dev, "invalid clock frequency %d\n", max_freq);
-+ return -ENXIO;
-+ }
-+
-+ ret = clk_prepare_enable(cclk);
-+ if (ret) {
-+ dev_err(dev, "cannot enable core clock\n");
-+ return ret;
-+ }
-+
-+ ret = clk_prepare_enable(iclk);
-+ if (ret) {
-+ clk_disable_unprepare(cclk);
-+ dev_err(dev, "cannot enable iface clock\n");
-+ return ret;
-+ }
-+
-+ data = readl_relaxed(base + QUP_HW_VERSION);
-+
-+ if (data < QUP_HW_VERSION_2_1_1) {
-+ clk_disable_unprepare(cclk);
-+ clk_disable_unprepare(iclk);
-+ dev_err(dev, "v.%08x is not supported\n", data);
-+ return -ENXIO;
-+ }
-+
-+ master = spi_alloc_master(dev, sizeof(struct spi_qup));
-+ if (!master) {
-+ clk_disable_unprepare(cclk);
-+ clk_disable_unprepare(iclk);
-+ dev_err(dev, "cannot allocate master\n");
-+ return -ENOMEM;
-+ }
-+
-+ master->bus_num = pdev->id;
-+ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
-+ master->num_chipselect = SPI_NUM_CHIPSELECTS;
-+ master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
-+ master->setup = spi_qup_setup;
-+ master->cleanup = spi_qup_cleanup;
-+ master->set_cs = spi_qup_set_cs;
-+ master->transfer_one = spi_qup_transfer_one;
-+ master->dev.of_node = pdev->dev.of_node;
-+ master->auto_runtime_pm = true;
-+
-+ platform_set_drvdata(pdev, master);
-+
-+ controller = spi_master_get_devdata(master);
-+
-+ controller->dev = dev;
-+ controller->base = base;
-+ controller->iclk = iclk;
-+ controller->cclk = cclk;
-+ controller->irq = irq;
-+ controller->max_speed_hz = max_freq;
-+
-+ spin_lock_init(&controller->lock);
-+ init_completion(&controller->done);
-+
-+ iomode = readl_relaxed(base + QUP_IO_M_MODES);
-+
-+ size = QUP_IO_M_OUTPUT_BLOCK_SIZE(iomode);
-+ if (size)
-+ controller->out_blk_sz = size * 16;
-+ else
-+ controller->out_blk_sz = 4;
-+
-+ size = QUP_IO_M_INPUT_BLOCK_SIZE(iomode);
-+ if (size)
-+ controller->in_blk_sz = size * 16;
-+ else
-+ controller->in_blk_sz = 4;
-+
-+ size = QUP_IO_M_OUTPUT_FIFO_SIZE(iomode);
-+ controller->out_fifo_sz = controller->out_blk_sz * (2 << size);
-+
-+ size = QUP_IO_M_INPUT_FIFO_SIZE(iomode);
-+ controller->in_fifo_sz = controller->in_blk_sz * (2 << size);
-+
-+ dev_info(dev, "v.%08x IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
-+ data, controller->in_blk_sz, controller->in_fifo_sz,
-+ controller->out_blk_sz, controller->out_fifo_sz);
-+
-+ writel_relaxed(1, base + QUP_SW_RESET);
-+
-+ ret = spi_qup_set_state(controller, QUP_STATE_RESET);
-+ if (ret) {
-+ dev_err(dev, "cannot set RESET state\n");
-+ goto error;
-+ }
-+
-+ writel_relaxed(0, base + QUP_OPERATIONAL);
-+ writel_relaxed(0, base + QUP_IO_M_MODES);
-+ writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
-+ writel_relaxed(SPI_ERROR_CLK_UNDER_RUN | SPI_ERROR_CLK_OVER_RUN,
-+ base + SPI_ERROR_FLAGS_EN);
-+
-+ writel_relaxed(0, base + SPI_CONFIG);
-+ writel_relaxed(SPI_IO_C_NO_TRI_STATE, base + SPI_IO_CONTROL);
-+
-+ ret = devm_request_irq(dev, irq, spi_qup_qup_irq,
-+ IRQF_TRIGGER_HIGH, pdev->name, controller);
-+ if (ret)
-+ goto error;
-+
-+ ret = devm_spi_register_master(dev, master);
-+ if (ret)
-+ goto error;
-+
-+ pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
-+ pm_runtime_use_autosuspend(dev);
-+ pm_runtime_set_active(dev);
-+ pm_runtime_enable(dev);
-+ return 0;
-+
-+error:
-+ clk_disable_unprepare(cclk);
-+ clk_disable_unprepare(iclk);
-+ spi_master_put(master);
-+ return ret;
-+}
-+
-+#ifdef CONFIG_PM_RUNTIME
-+static int spi_qup_pm_suspend_runtime(struct device *device)
-+{
-+ struct spi_master *master = dev_get_drvdata(device);
-+ struct spi_qup *controller = spi_master_get_devdata(master);
-+ u32 config;
-+
-+ /* Enable clocks auto gaiting */
-+ config = readl(controller->base + QUP_CONFIG);
-+ config |= QUP_CLOCK_AUTO_GATE;
-+ writel_relaxed(config, controller->base + QUP_CONFIG);
-+ return 0;
-+}
-+
-+static int spi_qup_pm_resume_runtime(struct device *device)
-+{
-+ struct spi_master *master = dev_get_drvdata(device);
-+ struct spi_qup *controller = spi_master_get_devdata(master);
-+ u32 config;
-+
-+ /* Disable clocks auto gaiting */
-+ config = readl_relaxed(controller->base + QUP_CONFIG);
-+ config &= ~QUP_CLOCK_AUTO_GATE;
-+ writel_relaxed(config, controller->base + QUP_CONFIG);
-+ return 0;
-+}
-+#endif /* CONFIG_PM_RUNTIME */
-+
-+#ifdef CONFIG_PM_SLEEP
-+static int spi_qup_suspend(struct device *device)
-+{
-+ struct spi_master *master = dev_get_drvdata(device);
-+ struct spi_qup *controller = spi_master_get_devdata(master);
-+ int ret;
-+
-+ ret = spi_master_suspend(master);
-+ if (ret)
-+ return ret;
-+
-+ ret = spi_qup_set_state(controller, QUP_STATE_RESET);
-+ if (ret)
-+ return ret;
-+
-+ clk_disable_unprepare(controller->cclk);
-+ clk_disable_unprepare(controller->iclk);
-+ return 0;
-+}
-+
-+static int spi_qup_resume(struct device *device)
-+{
-+ struct spi_master *master = dev_get_drvdata(device);
-+ struct spi_qup *controller = spi_master_get_devdata(master);
-+ int ret;
-+
-+ ret = clk_prepare_enable(controller->iclk);
-+ if (ret)
-+ return ret;
-+
-+ ret = clk_prepare_enable(controller->cclk);
-+ if (ret)
-+ return ret;
-+
-+ ret = spi_qup_set_state(controller, QUP_STATE_RESET);
-+ if (ret)
-+ return ret;
-+
-+ return spi_master_resume(master);
-+}
-+#endif /* CONFIG_PM_SLEEP */
-+
-+static int spi_qup_remove(struct platform_device *pdev)
-+{
-+ struct spi_master *master = dev_get_drvdata(&pdev->dev);
-+ struct spi_qup *controller = spi_master_get_devdata(master);
-+ int ret;
-+
-+ ret = pm_runtime_get_sync(&pdev->dev);
-+ if (ret)
-+ return ret;
-+
-+ ret = spi_qup_set_state(controller, QUP_STATE_RESET);
-+ if (ret)
-+ return ret;
-+
-+ clk_disable_unprepare(controller->cclk);
-+ clk_disable_unprepare(controller->iclk);
-+
-+ pm_runtime_put_noidle(&pdev->dev);
-+ pm_runtime_disable(&pdev->dev);
-+ spi_master_put(master);
-+ return 0;
-+}
-+
-+static struct of_device_id spi_qup_dt_match[] = {
-+ { .compatible = "qcom,spi-qup-v2.1.1", },
-+ { .compatible = "qcom,spi-qup-v2.2.1", },
-+ { }
-+};
-+MODULE_DEVICE_TABLE(of, spi_qup_dt_match);
-+
-+static const struct dev_pm_ops spi_qup_dev_pm_ops = {
-+ SET_SYSTEM_SLEEP_PM_OPS(spi_qup_suspend, spi_qup_resume)
-+ SET_RUNTIME_PM_OPS(spi_qup_pm_suspend_runtime,
-+ spi_qup_pm_resume_runtime,
-+ NULL)
-+};
-+
-+static struct platform_driver spi_qup_driver = {
-+ .driver = {
-+ .name = "spi_qup",
-+ .owner = THIS_MODULE,
-+ .pm = &spi_qup_dev_pm_ops,
-+ .of_match_table = spi_qup_dt_match,
-+ },
-+ .probe = spi_qup_probe,
-+ .remove = spi_qup_remove,
-+};
-+module_platform_driver(spi_qup_driver);
-+
-+MODULE_LICENSE("GPL v2");
-+MODULE_VERSION("0.4");
-+MODULE_ALIAS("platform:spi_qup");
projects / openwrt / svn-archive / archive.git / blobdiff