From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 59430C83016 for ; Tue, 1 Dec 2020 21:14:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F15A520671 for ; Tue, 1 Dec 2020 21:14:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="P/m5r8nk" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389200AbgLAVNf (ORCPT ); Tue, 1 Dec 2020 16:13:35 -0500 Received: from hqnvemgate24.nvidia.com ([216.228.121.143]:14570 "EHLO hqnvemgate24.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387962AbgLAVNd (ORCPT ); Tue, 1 Dec 2020 16:13:33 -0500 Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Tue, 01 Dec 2020 13:12:52 -0800 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 1 Dec 2020 21:12:52 +0000 Received: from skomatineni-linux.nvidia.com (10.124.1.5) by mail.nvidia.com (172.20.187.12) with Microsoft SMTP Server id 15.0.1473.3 via Frontend Transport; Tue, 1 Dec 2020 21:12:51 +0000 From: Sowjanya Komatineni To: , , , CC: , , , , Subject: [PATCH v1 3/7] spi: qspi-tegra: Add support for Tegra210 QSPI controller Date: Tue, 1 Dec 2020 13:12:44 -0800 Message-ID: <1606857168-5839-4-git-send-email-skomatineni@nvidia.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1606857168-5839-1-git-send-email-skomatineni@nvidia.com> References: <1606857168-5839-1-git-send-email-skomatineni@nvidia.com> X-NVConfidentiality: public MIME-Version: 1.0 Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1606857172; bh=NpH7ZPCmwpZc01FFpOPrDgxCXflgplHupYk9KXlTzeo=; h=From:To:CC:Subject:Date:Message-ID:X-Mailer:In-Reply-To: References:X-NVConfidentiality:MIME-Version:Content-Type; b=P/m5r8nkOmkYp9ft/basnBfVNkXTpk0tNPw4+h45mxJsWHaEzO09YmgPvFiBq70OQ rkoljgaB2axcp+j50PrSXrlgOr77UZAbR2jClpjFKfgBhTQ34ZBrEpmXGRsmhlBFAl yTlPydjnptbovHSubBxMYsW7NkIzIx7ap4I+gDQBo7BR28AMQ/02rKlDqMGoFSSdJh i9UxOlzUnEVb6J8AR7p+ao/RarLtraHi4UqvTBU7rJWgnMwshrb91bVQXwVgmU99Yv 32vO6zdBTcYwZ4qCZnGMaSkcWUCgTADFMSRazAz27eG6fL3PU9N6YQXB8yEpWRYzge jdTvzsVCRgNtA== Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tegra SoC has a Quad SPI controller starting from Tegra210. This patch adds support for Tegra210 QSPI controller. Signed-off-by: Sowjanya Komatineni --- drivers/spi/Kconfig | 9 + drivers/spi/Makefile | 1 + drivers/spi/qspi-tegra.c | 1418 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 1428 insertions(+) create mode 100644 drivers/spi/qspi-tegra.c diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 3fd16b7..1a021e8 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -844,6 +844,15 @@ config SPI_MXS help SPI driver for Freescale MXS devices. +config QSPI_TEGRA + tristate "Nvidia Tegra QSPI Controller" + depends on (ARCH_TEGRA && TEGRA20_APB_DMA) || COMPILE_TEST + depends on RESET_CONTROLLER + help + QSPI driver for Nvidia Tegra QSPI Controller interface. This + controller is different from the spi controller and is available + on Tegra SoCs starting from Tegra210. + config SPI_TEGRA114 tristate "NVIDIA Tegra114 SPI Controller" depends on (ARCH_TEGRA && TEGRA20_APB_DMA) || COMPILE_TEST diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 6fea582..eb56f89 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -115,6 +115,7 @@ obj-$(CONFIG_SPI_ST_SSC4) += spi-st-ssc4.o obj-$(CONFIG_SPI_SUN4I) += spi-sun4i.o obj-$(CONFIG_SPI_SUN6I) += spi-sun6i.o obj-$(CONFIG_SPI_SYNQUACER) += spi-synquacer.o +obj-$(CONFIG_QSPI_TEGRA) += qspi-tegra.o obj-$(CONFIG_SPI_TEGRA114) += spi-tegra114.o obj-$(CONFIG_SPI_TEGRA20_SFLASH) += spi-tegra20-sflash.o obj-$(CONFIG_SPI_TEGRA20_SLINK) += spi-tegra20-slink.o diff --git a/drivers/spi/qspi-tegra.c b/drivers/spi/qspi-tegra.c new file mode 100644 index 0000000..67a8b44 --- /dev/null +++ b/drivers/spi/qspi-tegra.c @@ -0,0 +1,1418 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2020 NVIDIA CORPORATION. All rights reserved. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define QSPI_COMMAND1 0x000 +#define QSPI_BIT_LENGTH(x) (((x) & 0x1f) << 0) +#define QSPI_PACKED BIT(5) +#define QSPI_INTERFACE_WIDTH_MASK (0x03 << 7) +#define QSPI_INTERFACE_WIDTH(x) (((x) & 0x03) << 7) +#define QSPI_INTERFACE_WIDTH_SINGLE QSPI_INTERFACE_WIDTH(0) +#define QSPI_INTERFACE_WIDTH_DUAL QSPI_INTERFACE_WIDTH(1) +#define QSPI_INTERFACE_WIDTH_QUAD QSPI_INTERFACE_WIDTH(2) +#define QSPI_SDR_DDR_SEL BIT(9) +#define QSPI_TX_EN BIT(11) +#define QSPI_RX_EN BIT(12) +#define QSPI_CS_SW_VAL BIT(20) +#define QSPI_CS_SW_HW BIT(21) +#define QSPI_CONTROL_MODE_0 (0 << 28) +#define QSPI_CONTROL_MODE_3 (3 << 28) +#define QSPI_CONTROL_MODE_MASK (3 << 28) +#define QSPI_M_S BIT(30) +#define QSPI_PIO BIT(31) + +#define QSPI_COMMAND2 0x004 +#define QSPI_TX_TAP_DELAY(x) (((x) & 0x3f) << 10) +#define QSPI_RX_TAP_DELAY(x) (((x) & 0xff) << 0) + +#define QSPI_CS_TIMING1 0x008 +#define QSPI_SETUP_HOLD(setup, hold) (((setup) << 4) | (hold)) + +#define QSPI_CS_TIMING2 0x00c +#define CYCLES_BETWEEN_PACKETS_0(x) (((x) & 0x1f) << 0) +#define CS_ACTIVE_BETWEEN_PACKETS_0 BIT(5) + +#define QSPI_TRANS_STATUS 0x010 +#define QSPI_BLK_CNT(val) (((val) >> 0) & 0xffff) +#define QSPI_RDY BIT(30) + +#define QSPI_FIFO_STATUS 0x014 +#define QSPI_RX_FIFO_EMPTY BIT(0) +#define QSPI_RX_FIFO_FULL BIT(1) +#define QSPI_TX_FIFO_EMPTY BIT(2) +#define QSPI_TX_FIFO_FULL BIT(3) +#define QSPI_RX_FIFO_UNF BIT(4) +#define QSPI_RX_FIFO_OVF BIT(5) +#define QSPI_TX_FIFO_UNF BIT(6) +#define QSPI_TX_FIFO_OVF BIT(7) +#define QSPI_ERR BIT(8) +#define QSPI_TX_FIFO_FLUSH BIT(14) +#define QSPI_RX_FIFO_FLUSH BIT(15) +#define QSPI_TX_FIFO_EMPTY_COUNT(val) (((val) >> 16) & 0x7f) +#define QSPI_RX_FIFO_FULL_COUNT(val) (((val) >> 23) & 0x7f) + +#define QSPI_FIFO_ERROR (QSPI_RX_FIFO_UNF | \ + QSPI_RX_FIFO_OVF | \ + QSPI_TX_FIFO_UNF | \ + QSPI_TX_FIFO_OVF) +#define QSPI_FIFO_EMPTY (QSPI_RX_FIFO_EMPTY | \ + QSPI_TX_FIFO_EMPTY) + +#define QSPI_TX_DATA 0x018 +#define QSPI_RX_DATA 0x01c + +#define QSPI_DMA_CTL 0x020 +#define QSPI_TX_TRIG(n) (((n) & 0x3) << 15) +#define QSPI_TX_TRIG_1 QSPI_TX_TRIG(0) +#define QSPI_TX_TRIG_4 QSPI_TX_TRIG(1) +#define QSPI_TX_TRIG_8 QSPI_TX_TRIG(2) +#define QSPI_TX_TRIG_16 QSPI_TX_TRIG(3) + +#define QSPI_RX_TRIG(n) (((n) & 0x3) << 19) +#define QSPI_RX_TRIG_1 QSPI_RX_TRIG(0) +#define QSPI_RX_TRIG_4 QSPI_RX_TRIG(1) +#define QSPI_RX_TRIG_8 QSPI_RX_TRIG(2) +#define QSPI_RX_TRIG_16 QSPI_RX_TRIG(3) + +#define QSPI_DMA_EN BIT(31) + +#define QSPI_DMA_BLK 0x024 +#define QSPI_DMA_BLK_SET(x) (((x) & 0xffff) << 0) + +#define QSPI_TX_FIFO 0x108 +#define QSPI_RX_FIFO 0x188 + +#define QSPI_FIFO_DEPTH 64 + +#define QSPI_INTR_MASK 0x18c +#define QSPI_INTR_RX_FIFO_UNF_MASK BIT(25) +#define QSPI_INTR_RX_FIFO_OVF_MASK BIT(26) +#define QSPI_INTR_TX_FIFO_UNF_MASK BIT(27) +#define QSPI_INTR_TX_FIFO_OVF_MASK BIT(28) +#define QSPI_INTR_RDY_MASK BIT(29) +#define QSPI_INTR_RX_TX_FIFO_ERR (QSPI_INTR_RX_FIFO_UNF_MASK | \ + QSPI_INTR_RX_FIFO_OVF_MASK | \ + QSPI_INTR_TX_FIFO_UNF_MASK | \ + QSPI_INTR_TX_FIFO_OVF_MASK) + +#define QSPI_MISC_REG 0x194 +#define QSPI_NUM_DUMMY_CYCLE(x) (((x) & 0xff) << 0) + +#define DATA_DIR_TX BIT(0) +#define DATA_DIR_RX BIT(1) + +#define QSPI_DMA_TIMEOUT (msecs_to_jiffies(1000)) +#define DEFAULT_QSPI_DMA_BUF_LEN (64 * 1024) +#define QSPI_MAX_SPEED 102000000 + +enum transfer_phase { + CMD_BYTE_XFER = 0, + ADDR_BYTES_XFER, + DUMMY_BYTES_XFER, + DATA_BYTES_XFER, + MAX_XFERS, +}; + +struct tegra_qspi_client_data { + int tx_clk_tap_delay; + int rx_clk_tap_delay; +}; + +struct tegra_qspi_data { + struct device *dev; + struct spi_master *master; + /* Lock to protect data accessed by irq */ + spinlock_t lock; + + struct clk *clk; + struct reset_control *rst; + void __iomem *base; + phys_addr_t phys; + unsigned int irq; + + u32 cur_speed; + unsigned int cur_pos; + unsigned int words_per_32bit; + unsigned int bytes_per_word; + unsigned int curr_dma_words; + unsigned int cur_direction; + + unsigned int cur_rx_pos; + unsigned int cur_tx_pos; + + unsigned int dma_buf_size; + unsigned int max_buf_size; + bool is_curr_dma_xfer; + + struct completion rx_dma_complete; + struct completion tx_dma_complete; + + u32 tx_status; + u32 rx_status; + u32 status_reg; + bool is_packed; + bool use_dma; + + u32 command1_reg; + u32 dma_control_reg; + u32 def_command1_reg; + u32 def_command2_reg; + u32 spi_cs_timing1; + u32 spi_cs_timing2; + u8 dummy_cycles; + + struct completion xfer_completion; + struct spi_transfer *curr_xfer; + + struct dma_chan *rx_dma_chan; + u32 *rx_dma_buf; + dma_addr_t rx_dma_phys; + struct dma_async_tx_descriptor *rx_dma_desc; + + struct dma_chan *tx_dma_chan; + u32 *tx_dma_buf; + dma_addr_t tx_dma_phys; + struct dma_async_tx_descriptor *tx_dma_desc; +}; + +static int tegra_qspi_runtime_suspend(struct device *dev); +static int tegra_qspi_runtime_resume(struct device *dev); + +static inline u32 tegra_qspi_readl(struct tegra_qspi_data *tqspi, + unsigned long reg) +{ + return readl(tqspi->base + reg); +} + +static inline void tegra_qspi_writel(struct tegra_qspi_data *tqspi, + u32 val, unsigned long reg) +{ + writel(val, tqspi->base + reg); + + /* Read back register to make sure that register writes completed */ + if (reg != QSPI_TX_FIFO) + readl(tqspi->base + QSPI_COMMAND1); +} + +static void tegra_qspi_mask_clear_irq(struct tegra_qspi_data *tqspi) +{ + u32 val; + + /* Write 1 to clear status register */ + val = tegra_qspi_readl(tqspi, QSPI_TRANS_STATUS); + tegra_qspi_writel(tqspi, val, QSPI_TRANS_STATUS); + + val = tegra_qspi_readl(tqspi, QSPI_INTR_MASK); + if (!(val & QSPI_INTR_RDY_MASK)) { + val |= (QSPI_INTR_RDY_MASK | QSPI_INTR_RX_TX_FIFO_ERR); + tegra_qspi_writel(tqspi, val, QSPI_INTR_MASK); + } + + /* Clear fifo status error if any */ + val = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS); + if (val & QSPI_ERR) + tegra_qspi_writel(tqspi, QSPI_ERR | QSPI_FIFO_ERROR, + QSPI_FIFO_STATUS); +} + +static unsigned int +tegra_qspi_calculate_curr_xfer_param(struct tegra_qspi_data *tqspi, + struct spi_transfer *t) +{ + unsigned int remain_len = t->len - tqspi->cur_pos; + unsigned int max_word; + unsigned int bits_per_word = t->bits_per_word; + unsigned int max_len; + unsigned int total_fifo_words; + + tqspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8); + + if ((bits_per_word == 8 || bits_per_word == 16 || + bits_per_word == 32) && t->len > 3) { + tqspi->is_packed = true; + tqspi->words_per_32bit = 32 / bits_per_word; + } else { + tqspi->is_packed = false; + tqspi->words_per_32bit = 1; + } + + if (tqspi->is_packed) { + max_len = min(remain_len, tqspi->max_buf_size); + tqspi->curr_dma_words = max_len / tqspi->bytes_per_word; + total_fifo_words = (max_len + 3) / 4; + } else { + max_word = (remain_len - 1) / tqspi->bytes_per_word + 1; + max_word = min(max_word, tqspi->max_buf_size / 4); + tqspi->curr_dma_words = max_word; + total_fifo_words = max_word; + } + + return total_fifo_words; +} + +static unsigned int +tegra_qspi_fill_tx_fifo_from_client_txbuf(struct tegra_qspi_data *tqspi, + struct spi_transfer *t) +{ + unsigned int len; + unsigned int tx_empty_count; + u32 fifo_status, x; + unsigned int max_n_32bit; + unsigned int i, count; + unsigned int written_words; + unsigned int fifo_words_left; + u8 *tx_buf = (u8 *)t->tx_buf + tqspi->cur_tx_pos; + + fifo_status = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS); + tx_empty_count = QSPI_TX_FIFO_EMPTY_COUNT(fifo_status); + + if (tqspi->is_packed) { + fifo_words_left = tx_empty_count * tqspi->words_per_32bit; + written_words = min(fifo_words_left, tqspi->curr_dma_words); + len = written_words * tqspi->bytes_per_word; + max_n_32bit = DIV_ROUND_UP(len, 4); + for (count = 0; count < max_n_32bit; count++) { + x = 0; + + for (i = 0; (i < 4) && len; i++, len--) + x |= (u32)(*tx_buf++) << (i * 8); + tegra_qspi_writel(tqspi, x, QSPI_TX_FIFO); + } + + tqspi->cur_tx_pos += written_words * tqspi->bytes_per_word; + } else { + unsigned int write_bytes; + u8 bytes_per_word = tqspi->bytes_per_word; + + max_n_32bit = min(tqspi->curr_dma_words, tx_empty_count); + written_words = max_n_32bit; + len = written_words * tqspi->bytes_per_word; + if (len > t->len - tqspi->cur_pos) + len = t->len - tqspi->cur_pos; + write_bytes = len; + for (count = 0; count < max_n_32bit; count++) { + x = 0; + + for (i = 0; len && (i < bytes_per_word); i++, len--) + x |= (u32)(*tx_buf++) << (i * 8); + tegra_qspi_writel(tqspi, x, QSPI_TX_FIFO); + } + + tqspi->cur_tx_pos += write_bytes; + } + + return written_words; +} + +static unsigned int +tegra_qspi_read_rx_fifo_to_client_rxbuf(struct tegra_qspi_data *tqspi, + struct spi_transfer *t) +{ + unsigned int rx_full_count; + u32 fifo_status, x; + unsigned int i, count; + unsigned int read_words = 0; + unsigned int len; + u8 *rx_buf = (u8 *)t->rx_buf + tqspi->cur_rx_pos; + + fifo_status = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS); + rx_full_count = QSPI_RX_FIFO_FULL_COUNT(fifo_status); + if (tqspi->is_packed) { + len = tqspi->curr_dma_words * tqspi->bytes_per_word; + for (count = 0; count < rx_full_count; count++) { + x = tegra_qspi_readl(tqspi, QSPI_RX_FIFO); + + for (i = 0; len && (i < 4); i++, len--) + *rx_buf++ = (x >> i * 8) & 0xff; + } + + read_words += tqspi->curr_dma_words; + tqspi->cur_rx_pos += tqspi->curr_dma_words * + tqspi->bytes_per_word; + } else { + u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; + u8 bytes_per_word = tqspi->bytes_per_word; + unsigned int read_bytes; + + len = rx_full_count * bytes_per_word; + if (len > t->len - tqspi->cur_pos) + len = t->len - tqspi->cur_pos; + read_bytes = len; + for (count = 0; count < rx_full_count; count++) { + x = tegra_qspi_readl(tqspi, QSPI_RX_FIFO) & rx_mask; + + for (i = 0; len && (i < bytes_per_word); i++, len--) + *rx_buf++ = (x >> (i * 8)) & 0xff; + } + + read_words += rx_full_count; + tqspi->cur_rx_pos += read_bytes; + } + + return read_words; +} + +static void +tegra_qspi_copy_client_txbuf_to_qspi_txbuf(struct tegra_qspi_data *tqspi, + struct spi_transfer *t) +{ + /* Make the dma buffer to read by cpu */ + dma_sync_single_for_cpu(tqspi->dev, tqspi->tx_dma_phys, + tqspi->dma_buf_size, DMA_TO_DEVICE); + + if (tqspi->is_packed) { + unsigned int len = tqspi->curr_dma_words * + tqspi->bytes_per_word; + + memcpy(tqspi->tx_dma_buf, t->tx_buf + tqspi->cur_pos, len); + tqspi->cur_tx_pos += tqspi->curr_dma_words * + tqspi->bytes_per_word; + } else { + u8 *tx_buf = (u8 *)t->tx_buf + tqspi->cur_tx_pos; + unsigned int i; + unsigned int count; + unsigned int consume; + unsigned int write_bytes; + + consume = tqspi->curr_dma_words * tqspi->bytes_per_word; + if (consume > t->len - tqspi->cur_pos) + consume = t->len - tqspi->cur_pos; + write_bytes = consume; + for (count = 0; count < tqspi->curr_dma_words; count++) { + u32 x = 0; + + for (i = 0; consume && (i < tqspi->bytes_per_word); + i++, consume--) + x |= (u32)(*tx_buf++) << (i * 8); + tqspi->tx_dma_buf[count] = x; + } + + tqspi->cur_tx_pos += write_bytes; + } + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tqspi->dev, tqspi->tx_dma_phys, + tqspi->dma_buf_size, DMA_TO_DEVICE); +} + +static void +tegra_qspi_copy_qspi_rxbuf_to_client_rxbuf(struct tegra_qspi_data *tqspi, + struct spi_transfer *t) +{ + /* Make the dma buffer to read by cpu */ + dma_sync_single_for_cpu(tqspi->dev, tqspi->rx_dma_phys, + tqspi->dma_buf_size, DMA_FROM_DEVICE); + + if (tqspi->is_packed) { + unsigned int len = tqspi->curr_dma_words * + tqspi->bytes_per_word; + + memcpy(t->rx_buf + tqspi->cur_rx_pos, tqspi->rx_dma_buf, len); + tqspi->cur_rx_pos += tqspi->curr_dma_words * + tqspi->bytes_per_word; + } else { + unsigned char *rx_buf = t->rx_buf + tqspi->cur_rx_pos; + u32 rx_mask = ((u32)1 << t->bits_per_word) - 1; + unsigned int i; + unsigned int count; + unsigned int consume; + unsigned int read_bytes; + + consume = tqspi->curr_dma_words * tqspi->bytes_per_word; + if (consume > t->len - tqspi->cur_pos) + consume = t->len - tqspi->cur_pos; + read_bytes = consume; + for (count = 0; count < tqspi->curr_dma_words; count++) { + u32 x = tqspi->rx_dma_buf[count] & rx_mask; + + for (i = 0; consume && (i < tqspi->bytes_per_word); + i++, consume--) + *rx_buf++ = (x >> (i * 8)) & 0xFF; + } + + tqspi->cur_rx_pos += read_bytes; + } + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tqspi->dev, tqspi->rx_dma_phys, + tqspi->dma_buf_size, DMA_FROM_DEVICE); +} + +static void tegra_qspi_dma_complete(void *args) +{ + struct completion *dma_complete = args; + + complete(dma_complete); +} + +static int tegra_qspi_start_tx_dma(struct tegra_qspi_data *tqspi, int len) +{ + reinit_completion(&tqspi->tx_dma_complete); + tqspi->tx_dma_desc = dmaengine_prep_slave_single(tqspi->tx_dma_chan, + tqspi->tx_dma_phys, len, DMA_MEM_TO_DEV, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tqspi->tx_dma_desc) { + dev_err(tqspi->dev, "Not able to get desc for Tx\n"); + return -EIO; + } + + tqspi->tx_dma_desc->callback = tegra_qspi_dma_complete; + tqspi->tx_dma_desc->callback_param = &tqspi->tx_dma_complete; + + dmaengine_submit(tqspi->tx_dma_desc); + dma_async_issue_pending(tqspi->tx_dma_chan); + return 0; +} + +static int tegra_qspi_start_rx_dma(struct tegra_qspi_data *tqspi, int len) +{ + reinit_completion(&tqspi->rx_dma_complete); + tqspi->rx_dma_desc = dmaengine_prep_slave_single(tqspi->rx_dma_chan, + tqspi->rx_dma_phys, len, DMA_DEV_TO_MEM, + DMA_PREP_INTERRUPT | DMA_CTRL_ACK); + if (!tqspi->rx_dma_desc) { + dev_err(tqspi->dev, "Not able to get desc for Rx\n"); + return -EIO; + } + + tqspi->rx_dma_desc->callback = tegra_qspi_dma_complete; + tqspi->rx_dma_desc->callback_param = &tqspi->rx_dma_complete; + + dmaengine_submit(tqspi->rx_dma_desc); + dma_async_issue_pending(tqspi->rx_dma_chan); + return 0; +} + +static int tegra_qspi_flush_fifos(struct tegra_qspi_data *tqspi) +{ + unsigned long timeout = jiffies + HZ; + u32 status; + + status = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS); + if ((status & QSPI_FIFO_EMPTY) == QSPI_FIFO_EMPTY) + return 0; + + status |= QSPI_RX_FIFO_FLUSH | QSPI_TX_FIFO_FLUSH; + tegra_qspi_writel(tqspi, status, QSPI_FIFO_STATUS); + while ((status & QSPI_FIFO_EMPTY) != QSPI_FIFO_EMPTY) { + status = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS); + if (time_after(jiffies, timeout)) { + dev_err(tqspi->dev, + "timeout waiting for fifo flush\n"); + return -EIO; + } + + udelay(1); + } + + return 0; +} + +static void tegra_qspi_unmask_irq(struct tegra_qspi_data *tqspi) +{ + u32 intr_mask; + + intr_mask = tegra_qspi_readl(tqspi, QSPI_INTR_MASK); + intr_mask &= ~(QSPI_INTR_RDY_MASK | QSPI_INTR_RX_TX_FIFO_ERR); + tegra_qspi_writel(tqspi, intr_mask, QSPI_INTR_MASK); +} + +static int tegra_qspi_start_dma_based_transfer(struct tegra_qspi_data *tqspi, + struct spi_transfer *t) +{ + u32 val; + unsigned int len; + int ret = 0; + u8 dma_burst; + struct dma_slave_config dma_sconfig = {0}; + + val = QSPI_DMA_BLK_SET(tqspi->curr_dma_words - 1); + tegra_qspi_writel(tqspi, val, QSPI_DMA_BLK); + + tegra_qspi_unmask_irq(tqspi); + + if (tqspi->is_packed) + len = DIV_ROUND_UP(tqspi->curr_dma_words * + tqspi->bytes_per_word, 4) * 4; + else + len = tqspi->curr_dma_words * 4; + + /* Set attention level based on length of transfer */ + val = 0; + if (len & 0xF) { + val |= QSPI_TX_TRIG_1 | QSPI_RX_TRIG_1; + dma_burst = 1; + } else if (((len) >> 4) & 0x1) { + val |= QSPI_TX_TRIG_4 | QSPI_RX_TRIG_4; + dma_burst = 4; + } else { + val |= QSPI_TX_TRIG_8 | QSPI_RX_TRIG_8; + dma_burst = 8; + } + + tegra_qspi_writel(tqspi, val, QSPI_DMA_CTL); + tqspi->dma_control_reg = val; + + dma_sconfig.device_fc = true; + if (tqspi->cur_direction & DATA_DIR_TX) { + dma_sconfig.dst_addr = tqspi->phys + QSPI_TX_FIFO; + dma_sconfig.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_sconfig.dst_maxburst = dma_burst; + ret = dmaengine_slave_config(tqspi->tx_dma_chan, &dma_sconfig); + if (ret < 0) { + dev_err(tqspi->dev, + "DMA slave config failed: %d\n", ret); + return ret; + } + + tegra_qspi_copy_client_txbuf_to_qspi_txbuf(tqspi, t); + ret = tegra_qspi_start_tx_dma(tqspi, len); + if (ret < 0) { + dev_err(tqspi->dev, + "Starting tx dma failed: %d\n", ret); + return ret; + } + } + + if (tqspi->cur_direction & DATA_DIR_RX) { + dma_sconfig.src_addr = tqspi->phys + QSPI_RX_FIFO; + dma_sconfig.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; + dma_sconfig.src_maxburst = dma_burst; + ret = dmaengine_slave_config(tqspi->rx_dma_chan, &dma_sconfig); + if (ret < 0) { + dev_err(tqspi->dev, + "DMA slave config failed: %d\n", ret); + return ret; + } + + /* Make the dma buffer to read by dma */ + dma_sync_single_for_device(tqspi->dev, tqspi->rx_dma_phys, + tqspi->dma_buf_size, + DMA_FROM_DEVICE); + + ret = tegra_qspi_start_rx_dma(tqspi, len); + if (ret < 0) { + dev_err(tqspi->dev, + "Starting rx dma failed: %d\n", ret); + if (tqspi->cur_direction & DATA_DIR_TX) + dmaengine_terminate_all(tqspi->tx_dma_chan); + return ret; + } + } + + tegra_qspi_writel(tqspi, tqspi->command1_reg, QSPI_COMMAND1); + + tqspi->is_curr_dma_xfer = true; + tqspi->dma_control_reg = val; + val |= QSPI_DMA_EN; + tegra_qspi_writel(tqspi, val, QSPI_DMA_CTL); + + return ret; +} + +static int tegra_qspi_start_cpu_based_transfer(struct tegra_qspi_data *qspi, + struct spi_transfer *t) +{ + u32 val; + unsigned int cur_words; + + if (qspi->cur_direction & DATA_DIR_TX) + cur_words = tegra_qspi_fill_tx_fifo_from_client_txbuf(qspi, t); + else + cur_words = qspi->curr_dma_words; + + val = QSPI_DMA_BLK_SET(cur_words - 1); + tegra_qspi_writel(qspi, val, QSPI_DMA_BLK); + + tegra_qspi_unmask_irq(qspi); + + qspi->is_curr_dma_xfer = false; + val = qspi->command1_reg; + val |= QSPI_PIO; + tegra_qspi_writel(qspi, val, QSPI_COMMAND1); + + return 0; +} + +static int tegra_qspi_init_dma_param(struct tegra_qspi_data *tqspi, + bool dma_to_memory) +{ + struct dma_chan *dma_chan; + u32 *dma_buf; + dma_addr_t dma_phys; + + if (!device_property_present(tqspi->dev, "dmas")) + return 0; + + dma_chan = dma_request_chan(tqspi->dev, dma_to_memory ? "rx" : "tx"); + if (IS_ERR(dma_chan)) + return dev_err_probe(tqspi->dev, PTR_ERR(dma_chan), + "Dma channel is not available\n"); + + dma_buf = dma_alloc_coherent(tqspi->dev, tqspi->dma_buf_size, + &dma_phys, GFP_KERNEL); + if (!dma_buf) { + dma_release_channel(dma_chan); + return -ENOMEM; + } + + if (dma_to_memory) { + tqspi->rx_dma_chan = dma_chan; + tqspi->rx_dma_buf = dma_buf; + tqspi->rx_dma_phys = dma_phys; + } else { + tqspi->tx_dma_chan = dma_chan; + tqspi->tx_dma_buf = dma_buf; + tqspi->tx_dma_phys = dma_phys; + } + + tqspi->use_dma = true; + + return 0; +} + +static void tegra_qspi_deinit_dma_param(struct tegra_qspi_data *tqspi, + bool dma_to_memory) +{ + u32 *dma_buf; + dma_addr_t dma_phys; + struct dma_chan *dma_chan; + + if (dma_to_memory) { + dma_buf = tqspi->rx_dma_buf; + dma_chan = tqspi->rx_dma_chan; + dma_phys = tqspi->rx_dma_phys; + tqspi->rx_dma_chan = NULL; + tqspi->rx_dma_buf = NULL; + } else { + dma_buf = tqspi->tx_dma_buf; + dma_chan = tqspi->tx_dma_chan; + dma_phys = tqspi->tx_dma_phys; + tqspi->tx_dma_buf = NULL; + tqspi->tx_dma_chan = NULL; + } + if (!dma_chan) + return; + + dma_free_coherent(tqspi->dev, tqspi->dma_buf_size, dma_buf, dma_phys); + dma_release_channel(dma_chan); +} + +static u32 tegra_qspi_setup_transfer_one(struct spi_device *spi, + struct spi_transfer *t, + bool is_first_of_msg) +{ + struct tegra_qspi_data *tqspi = spi_master_get_devdata(spi->master); + u32 speed = t->speed_hz; + u8 bits_per_word = t->bits_per_word; + u32 command1; + int req_mode; + + if (speed != tqspi->cur_speed) { + clk_set_rate(tqspi->clk, speed); + tqspi->cur_speed = speed; + } + + tqspi->cur_pos = 0; + tqspi->cur_rx_pos = 0; + tqspi->cur_tx_pos = 0; + tqspi->curr_xfer = t; + + if (is_first_of_msg) { + tegra_qspi_mask_clear_irq(tqspi); + + command1 = tqspi->def_command1_reg; + command1 |= QSPI_BIT_LENGTH(bits_per_word - 1); + + command1 &= ~QSPI_CONTROL_MODE_MASK; + req_mode = spi->mode & 0x3; + if (req_mode == SPI_MODE_3) + command1 |= QSPI_CONTROL_MODE_3; + else + command1 |= QSPI_CONTROL_MODE_0; + tegra_qspi_writel(tqspi, command1, QSPI_COMMAND1); + + /* toggle cs to active state */ + if (spi->mode & SPI_CS_HIGH) + command1 |= QSPI_CS_SW_VAL; + else + command1 &= ~QSPI_CS_SW_VAL; + tegra_qspi_writel(tqspi, command1, QSPI_COMMAND1); + } else { + command1 = tqspi->command1_reg; + command1 &= ~QSPI_BIT_LENGTH(~0); + command1 |= QSPI_BIT_LENGTH(bits_per_word - 1); + } + + command1 &= ~QSPI_SDR_DDR_SEL; + + return command1; +} + +static int tegra_qspi_start_transfer_one(struct spi_device *spi, + struct spi_transfer *t, u32 command1) +{ + struct tegra_qspi_data *tqspi = spi_master_get_devdata(spi->master); + unsigned int total_fifo_words; + u8 bus_width = 0; + int ret; + + total_fifo_words = tegra_qspi_calculate_curr_xfer_param(tqspi, t); + + command1 &= ~QSPI_PACKED; + if (tqspi->is_packed) + command1 |= QSPI_PACKED; + tegra_qspi_writel(tqspi, command1, QSPI_COMMAND1); + + command1 &= ~(QSPI_TX_EN | QSPI_RX_EN); + tqspi->cur_direction = 0; + if (t->rx_buf) { + command1 |= QSPI_RX_EN; + tqspi->cur_direction |= DATA_DIR_RX; + bus_width = t->rx_nbits; + } + + if (t->tx_buf) { + command1 |= QSPI_TX_EN; + tqspi->cur_direction |= DATA_DIR_TX; + bus_width = t->tx_nbits; + } + + command1 &= ~QSPI_INTERFACE_WIDTH_MASK; + if (bus_width == SPI_NBITS_QUAD) + command1 |= QSPI_INTERFACE_WIDTH_QUAD; + else if (bus_width == SPI_NBITS_DUAL) + command1 |= QSPI_INTERFACE_WIDTH_DUAL; + else + command1 |= QSPI_INTERFACE_WIDTH_SINGLE; + tqspi->command1_reg = command1; + + tegra_qspi_writel(tqspi, QSPI_NUM_DUMMY_CYCLE(tqspi->dummy_cycles), + QSPI_MISC_REG); + + ret = tegra_qspi_flush_fifos(tqspi); + if (ret < 0) + return ret; + + if (tqspi->use_dma && total_fifo_words > QSPI_FIFO_DEPTH) + ret = tegra_qspi_start_dma_based_transfer(tqspi, t); + else + ret = tegra_qspi_start_cpu_based_transfer(tqspi, t); + return ret; +} + +static struct tegra_qspi_client_data + *tegra_qspi_parse_cdata_dt(struct spi_device *spi) +{ + struct tegra_qspi_client_data *cdata; + struct device_node *slave_np; + + slave_np = spi->dev.of_node; + if (!slave_np) { + dev_dbg(&spi->dev, "device node not found\n"); + return NULL; + } + + cdata = kzalloc(sizeof(*cdata), GFP_KERNEL); + if (!cdata) + return NULL; + + of_property_read_u32(slave_np, "nvidia,tx-clk-tap-delay", + &cdata->tx_clk_tap_delay); + of_property_read_u32(slave_np, "nvidia,rx-clk-tap-delay", + &cdata->rx_clk_tap_delay); + return cdata; +} + +static void tegra_qspi_cleanup(struct spi_device *spi) +{ + struct tegra_qspi_client_data *cdata = spi->controller_data; + + spi->controller_data = NULL; + if (spi->dev.of_node) + kfree(cdata); +} + +static int tegra_qspi_setup(struct spi_device *spi) +{ + struct tegra_qspi_data *tqspi = spi_master_get_devdata(spi->master); + struct tegra_qspi_client_data *cdata = spi->controller_data; + u32 tx_tap = 0, rx_tap = 0; + u32 val; + unsigned long flags; + int ret; + + dev_dbg(&spi->dev, "setup %d bpw, %scpol, %scpha, %dHz\n", + spi->bits_per_word, + spi->mode & SPI_CPOL ? "" : "~", + spi->mode & SPI_CPHA ? "" : "~", + spi->max_speed_hz); + + if (!cdata) { + cdata = tegra_qspi_parse_cdata_dt(spi); + spi->controller_data = cdata; + } + + ret = pm_runtime_get_sync(tqspi->dev); + if (ret < 0) { + dev_err(tqspi->dev, "runtime resume failed: %d\n", ret); + if (cdata) + tegra_qspi_cleanup(spi); + return ret; + } + + spin_lock_irqsave(&tqspi->lock, flags); + /* keep default cs state to inactive */ + val = tqspi->def_command1_reg; + if (spi->mode & SPI_CS_HIGH) + val &= ~QSPI_CS_SW_VAL; + else + val |= QSPI_CS_SW_VAL; + + tqspi->def_command1_reg = val; + tegra_qspi_writel(tqspi, tqspi->def_command1_reg, QSPI_COMMAND1); + + if (cdata && cdata->tx_clk_tap_delay) + tx_tap = cdata->tx_clk_tap_delay; + if (cdata && cdata->rx_clk_tap_delay) + rx_tap = cdata->rx_clk_tap_delay; + tqspi->def_command2_reg = QSPI_TX_TAP_DELAY(tx_tap) | + QSPI_RX_TAP_DELAY(rx_tap); + tegra_qspi_writel(tqspi, tqspi->def_command2_reg, QSPI_COMMAND2); + + spin_unlock_irqrestore(&tqspi->lock, flags); + + pm_runtime_put(tqspi->dev); + return 0; +} + +static void tegra_qspi_dump_regs(struct tegra_qspi_data *tqspi) +{ + dev_dbg(tqspi->dev, "============ QSPI REGISTER DUMP ============\n"); + dev_dbg(tqspi->dev, "Command1: 0x%08x | Command2: 0x%08x\n", + tegra_qspi_readl(tqspi, QSPI_COMMAND1), + tegra_qspi_readl(tqspi, QSPI_COMMAND2)); + dev_dbg(tqspi->dev, "DMA_CTL: 0x%08x | DMA_BLK: 0x%08x\n", + tegra_qspi_readl(tqspi, QSPI_DMA_CTL), + tegra_qspi_readl(tqspi, QSPI_DMA_BLK)); + dev_dbg(tqspi->dev, "INTR_MASK: 0x%08x | MISC: 0x%08x\n", + tegra_qspi_readl(tqspi, QSPI_INTR_MASK), + tegra_qspi_readl(tqspi, QSPI_MISC_REG)); + dev_dbg(tqspi->dev, "TRANS_STAT: 0x%08x | FIFO_STATUS: 0x%08x\n", + tegra_qspi_readl(tqspi, QSPI_TRANS_STATUS), + tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS)); +} + +static int tegra_qspi_transfer_one_message(struct spi_master *master, + struct spi_message *msg) +{ + bool is_first_msg = true; + struct tegra_qspi_data *tqspi = spi_master_get_devdata(master); + struct spi_transfer *xfer; + struct spi_device *spi = msg->spi; + u8 dummy_cycles, ntransfers = 0; + int ret; + bool skip = false; + int xfer_phase = 0; + + msg->status = 0; + msg->actual_length = 0; + tqspi->tx_status = 0; + tqspi->rx_status = 0; + + /* + * Tegra QSPI hardware support dummy bytes transfer based on the + * programmed dummy clock cyles in QSPI register. + * So, get the total dummy bytes from the dummy bytes transfer in + * spi_messages and convert to dummy clock cyles. + */ + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + if (ntransfers == DUMMY_BYTES_XFER && + !(list_is_last(&xfer->transfer_list, &msg->transfers))) + dummy_cycles = xfer->len * 8 / xfer->tx_nbits; + ntransfers++; + } + + list_for_each_entry(xfer, &msg->transfers, transfer_list) { + u32 cmd1; + + /* + * Program dummy clock cycles in Tegra QSPI register only + * during address transfer phase. + */ + if (xfer_phase == ADDR_BYTES_XFER) + tqspi->dummy_cycles = dummy_cycles; + else + tqspi->dummy_cycles = 0; + + /* + * Tegra QSPI hardware support dummy bytes transfer. + * So, skip the transfer of dummy bytes from the software. + */ + if (ntransfers == MAX_XFERS && + xfer_phase == DUMMY_BYTES_XFER) { + msg->actual_length += xfer->len; + xfer_phase++; + continue; + } + + reinit_completion(&tqspi->xfer_completion); + + cmd1 = tegra_qspi_setup_transfer_one(spi, xfer, is_first_msg); + if (!xfer->len) { + ret = 0; + skip = true; + goto exit; + } + + ret = tegra_qspi_start_transfer_one(spi, xfer, cmd1); + if (ret < 0) { + dev_err(tqspi->dev, + "failed to start transfer: %d\n", ret); + goto exit; + } + + is_first_msg = false; + ret = wait_for_completion_timeout(&tqspi->xfer_completion, + QSPI_DMA_TIMEOUT); + if (WARN_ON(ret == 0)) { + dev_err(tqspi->dev, + "qspi transfer timeout: %d\n", ret); + if (tqspi->is_curr_dma_xfer && + (tqspi->cur_direction & DATA_DIR_TX)) + dmaengine_terminate_all(tqspi->tx_dma_chan); + if (tqspi->is_curr_dma_xfer && + (tqspi->cur_direction & DATA_DIR_RX)) + dmaengine_terminate_all(tqspi->rx_dma_chan); + ret = -EIO; + tegra_qspi_dump_regs(tqspi); + tegra_qspi_flush_fifos(tqspi); + reset_control_assert(tqspi->rst); + udelay(2); + reset_control_deassert(tqspi->rst); + goto exit; + } + + if (tqspi->tx_status || tqspi->rx_status) { + ret = -EIO; + dev_err(tqspi->dev, "error in transfer: %d\n", ret); + tegra_qspi_dump_regs(tqspi); + goto exit; + } + + msg->actual_length += xfer->len; + xfer_phase++; + } + + ret = 0; +exit: + tegra_qspi_writel(tqspi, tqspi->def_command1_reg, QSPI_COMMAND1); + msg->status = ret; + spi_finalize_current_message(master); + return ret; +} + +static irqreturn_t handle_cpu_based_xfer(struct tegra_qspi_data *tqspi) +{ + struct spi_transfer *t = tqspi->curr_xfer; + unsigned long flags; + + spin_lock_irqsave(&tqspi->lock, flags); + if (tqspi->tx_status || tqspi->rx_status) { + dev_err(tqspi->dev, "CpuXfer ERROR bit set 0x%x\n", + tqspi->status_reg); + dev_err(tqspi->dev, "CpuXfer 0x%08x:0x%08x\n", + tqspi->command1_reg, tqspi->dma_control_reg); + tegra_qspi_dump_regs(tqspi); + tegra_qspi_flush_fifos(tqspi); + complete(&tqspi->xfer_completion); + spin_unlock_irqrestore(&tqspi->lock, flags); + reset_control_assert(tqspi->rst); + udelay(2); + reset_control_deassert(tqspi->rst); + return IRQ_HANDLED; + } + + if (tqspi->cur_direction & DATA_DIR_RX) + tegra_qspi_read_rx_fifo_to_client_rxbuf(tqspi, t); + + if (tqspi->cur_direction & DATA_DIR_TX) + tqspi->cur_pos = tqspi->cur_tx_pos; + else + tqspi->cur_pos = tqspi->cur_rx_pos; + + if (tqspi->cur_pos == t->len) { + complete(&tqspi->xfer_completion); + goto exit; + } + + tegra_qspi_calculate_curr_xfer_param(tqspi, t); + tegra_qspi_start_cpu_based_transfer(tqspi, t); +exit: + spin_unlock_irqrestore(&tqspi->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t handle_dma_based_xfer(struct tegra_qspi_data *tqspi) +{ + struct spi_transfer *t = tqspi->curr_xfer; + long wait_status; + int err = 0; + unsigned int total_fifo_words; + unsigned long flags; + + /* Abort dmas if any error */ + if (tqspi->cur_direction & DATA_DIR_TX) { + if (tqspi->tx_status) { + dmaengine_terminate_all(tqspi->tx_dma_chan); + err += 1; + } else { + wait_status = wait_for_completion_interruptible_timeout( + &tqspi->tx_dma_complete, QSPI_DMA_TIMEOUT); + if (wait_status <= 0) { + dmaengine_terminate_all(tqspi->tx_dma_chan); + dev_err(tqspi->dev, "TxDma Xfer failed\n"); + err += 1; + } + } + } + + if (tqspi->cur_direction & DATA_DIR_RX) { + if (tqspi->rx_status) { + dmaengine_terminate_all(tqspi->rx_dma_chan); + err += 2; + } else { + wait_status = wait_for_completion_interruptible_timeout( + &tqspi->rx_dma_complete, QSPI_DMA_TIMEOUT); + if (wait_status <= 0) { + dmaengine_terminate_all(tqspi->rx_dma_chan); + dev_err(tqspi->dev, "RxDma Xfer failed\n"); + err += 2; + } + } + } + + spin_lock_irqsave(&tqspi->lock, flags); + if (err) { + dev_err(tqspi->dev, "DmaXfer: ERROR bit set 0x%x\n", + tqspi->status_reg); + dev_err(tqspi->dev, "DmaXfer 0x%08x:0x%08x\n", + tqspi->command1_reg, tqspi->dma_control_reg); + tegra_qspi_dump_regs(tqspi); + tegra_qspi_flush_fifos(tqspi); + complete(&tqspi->xfer_completion); + spin_unlock_irqrestore(&tqspi->lock, flags); + reset_control_assert(tqspi->rst); + udelay(2); + reset_control_deassert(tqspi->rst); + return IRQ_HANDLED; + } + + if (tqspi->cur_direction & DATA_DIR_RX) + tegra_qspi_copy_qspi_rxbuf_to_client_rxbuf(tqspi, t); + + if (tqspi->cur_direction & DATA_DIR_TX) + tqspi->cur_pos = tqspi->cur_tx_pos; + else + tqspi->cur_pos = tqspi->cur_rx_pos; + + if (tqspi->cur_pos == t->len) { + complete(&tqspi->xfer_completion); + goto exit; + } + + /* Continue transfer in current message */ + total_fifo_words = tegra_qspi_calculate_curr_xfer_param(tqspi, t); + if (total_fifo_words > QSPI_FIFO_DEPTH) + err = tegra_qspi_start_dma_based_transfer(tqspi, t); + else + err = tegra_qspi_start_cpu_based_transfer(tqspi, t); + +exit: + spin_unlock_irqrestore(&tqspi->lock, flags); + return IRQ_HANDLED; +} + +static irqreturn_t tegra_qspi_isr_thread(int irq, void *context_data) +{ + struct tegra_qspi_data *tqspi = context_data; + + if (!tqspi->is_curr_dma_xfer) + return handle_cpu_based_xfer(tqspi); + return handle_dma_based_xfer(tqspi); +} + +static irqreturn_t tegra_qspi_isr(int irq, void *context_data) +{ + struct tegra_qspi_data *tqspi = context_data; + + tqspi->status_reg = tegra_qspi_readl(tqspi, QSPI_FIFO_STATUS); + if (tqspi->cur_direction & DATA_DIR_TX) + tqspi->tx_status = tqspi->status_reg & + (QSPI_TX_FIFO_UNF | QSPI_TX_FIFO_OVF); + + if (tqspi->cur_direction & DATA_DIR_RX) + tqspi->rx_status = tqspi->status_reg & + (QSPI_RX_FIFO_OVF | QSPI_RX_FIFO_UNF); + tegra_qspi_mask_clear_irq(tqspi); + + return IRQ_WAKE_THREAD; +} + +static const struct of_device_id tegra_qspi_of_match[] = { + { .compatible = "nvidia,tegra210-qspi", }, + {} +}; +MODULE_DEVICE_TABLE(of, tegra_qspi_of_match); + +static int tegra_qspi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct tegra_qspi_data *tqspi; + struct resource *r; + int ret, qspi_irq; + int bus_num; + + master = spi_alloc_master(&pdev->dev, sizeof(*tqspi)); + if (!master) { + dev_err(&pdev->dev, "master allocation failed\n"); + return -ENOMEM; + } + + platform_set_drvdata(pdev, master); + tqspi = spi_master_get_devdata(master); + + if (of_property_read_u32(pdev->dev.of_node, "spi-max-frequency", + &master->max_speed_hz)) + master->max_speed_hz = QSPI_MAX_SPEED; + + /* the spi->mode bits understood by this driver: */ + master->mode_bits = SPI_MODE_0 | SPI_MODE_3 | SPI_CS_HIGH | + SPI_TX_DUAL | SPI_RX_DUAL | SPI_TX_QUAD | + SPI_RX_QUAD; + master->bits_per_word_mask = SPI_BPW_MASK(32) | SPI_BPW_MASK(16) | + SPI_BPW_MASK(8); + master->setup = tegra_qspi_setup; + master->cleanup = tegra_qspi_cleanup; + master->transfer_one_message = tegra_qspi_transfer_one_message; + master->num_chipselect = 1; + master->auto_runtime_pm = true; + bus_num = of_alias_get_id(pdev->dev.of_node, "spi"); + if (bus_num >= 0) + master->bus_num = bus_num; + + tqspi->master = master; + tqspi->dev = &pdev->dev; + spin_lock_init(&tqspi->lock); + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + tqspi->base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(tqspi->base)) { + ret = PTR_ERR(tqspi->base); + goto exit_free_master; + } + + tqspi->phys = r->start; + qspi_irq = platform_get_irq(pdev, 0); + tqspi->irq = qspi_irq; + + tqspi->clk = devm_clk_get(&pdev->dev, "qspi"); + if (IS_ERR(tqspi->clk)) { + ret = PTR_ERR(tqspi->clk); + dev_err(&pdev->dev, "failed to get clock: %d\n", ret); + goto exit_free_master; + } + + tqspi->rst = devm_reset_control_get_exclusive(&pdev->dev, "qspi"); + if (IS_ERR(tqspi->rst)) { + ret = PTR_ERR(tqspi->rst); + dev_err(&pdev->dev, "failed to get reset control: %d\n", ret); + goto exit_free_master; + } + + tqspi->max_buf_size = QSPI_FIFO_DEPTH << 2; + tqspi->dma_buf_size = DEFAULT_QSPI_DMA_BUF_LEN; + + ret = tegra_qspi_init_dma_param(tqspi, true); + if (ret < 0) + goto exit_free_master; + ret = tegra_qspi_init_dma_param(tqspi, false); + if (ret < 0) + goto exit_rx_dma_free; + + if (tqspi->use_dma) + tqspi->max_buf_size = tqspi->dma_buf_size; + + init_completion(&tqspi->tx_dma_complete); + init_completion(&tqspi->rx_dma_complete); + + init_completion(&tqspi->xfer_completion); + + pm_runtime_enable(&pdev->dev); + if (!pm_runtime_enabled(&pdev->dev)) { + ret = tegra_qspi_runtime_resume(&pdev->dev); + if (ret) + goto exit_pm_disable; + } + + ret = pm_runtime_get_sync(&pdev->dev); + if (ret < 0) { + dev_err(&pdev->dev, "runtime resume failed: %d\n", ret); + pm_runtime_put_noidle(&pdev->dev); + goto exit_pm_disable; + } + + reset_control_assert(tqspi->rst); + udelay(2); + reset_control_deassert(tqspi->rst); + tqspi->def_command1_reg = QSPI_M_S | QSPI_CS_SW_HW | QSPI_CS_SW_VAL; + tegra_qspi_writel(tqspi, tqspi->def_command1_reg, QSPI_COMMAND1); + tqspi->spi_cs_timing1 = tegra_qspi_readl(tqspi, QSPI_CS_TIMING1); + tqspi->spi_cs_timing2 = tegra_qspi_readl(tqspi, QSPI_CS_TIMING2); + tqspi->def_command2_reg = tegra_qspi_readl(tqspi, QSPI_COMMAND2); + + pm_runtime_put(&pdev->dev); + + ret = request_threaded_irq(tqspi->irq, tegra_qspi_isr, + tegra_qspi_isr_thread, IRQF_ONESHOT, + dev_name(&pdev->dev), tqspi); + if (ret < 0) { + dev_err(&pdev->dev, + "failed to request IRQ#%u: %d\n", tqspi->irq, ret); + goto exit_pm_disable; + } + + master->dev.of_node = pdev->dev.of_node; + ret = devm_spi_register_master(&pdev->dev, master); + if (ret < 0) { + dev_err(&pdev->dev, "failed to register master: %d\n", ret); + goto exit_free_irq; + } + return ret; + +exit_free_irq: + free_irq(qspi_irq, tqspi); +exit_pm_disable: + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_qspi_runtime_suspend(&pdev->dev); + tegra_qspi_deinit_dma_param(tqspi, false); +exit_rx_dma_free: + tegra_qspi_deinit_dma_param(tqspi, true); +exit_free_master: + spi_master_put(master); + return ret; +} + +static int tegra_qspi_remove(struct platform_device *pdev) +{ + struct spi_master *master = platform_get_drvdata(pdev); + struct tegra_qspi_data *tqspi = spi_master_get_devdata(master); + + free_irq(tqspi->irq, tqspi); + + tegra_qspi_deinit_dma_param(tqspi, false); + tegra_qspi_deinit_dma_param(tqspi, true); + + pm_runtime_disable(&pdev->dev); + if (!pm_runtime_status_suspended(&pdev->dev)) + tegra_qspi_runtime_suspend(&pdev->dev); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int tegra_qspi_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + + return spi_master_suspend(master); +} + +static int tegra_qspi_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_qspi_data *tqspi = spi_master_get_devdata(master); + int ret; + + ret = pm_runtime_get_sync(dev); + if (ret < 0) { + dev_err(dev, "runtime resume failed: %d\n", ret); + return ret; + } + + tegra_qspi_writel(tqspi, tqspi->command1_reg, QSPI_COMMAND1); + tegra_qspi_writel(tqspi, tqspi->def_command2_reg, QSPI_COMMAND2); + pm_runtime_put(dev); + + return spi_master_resume(master); +} +#endif + +static int tegra_qspi_runtime_suspend(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_qspi_data *tqspi = spi_master_get_devdata(master); + + /* Flush all write which are in PPSB queue by reading back */ + tegra_qspi_readl(tqspi, QSPI_COMMAND1); + + clk_disable_unprepare(tqspi->clk); + return 0; +} + +static int tegra_qspi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct tegra_qspi_data *tqspi = spi_master_get_devdata(master); + int ret; + + ret = clk_prepare_enable(tqspi->clk); + if (ret < 0) { + dev_err(tqspi->dev, "clk_prepare failed: %d\n", ret); + return ret; + } + return 0; +} + +static const struct dev_pm_ops tegra_qspi_pm_ops = { + SET_RUNTIME_PM_OPS(tegra_qspi_runtime_suspend, + tegra_qspi_runtime_resume, NULL) + SET_SYSTEM_SLEEP_PM_OPS(tegra_qspi_suspend, tegra_qspi_resume) +}; + +static struct platform_driver tegra_qspi_driver = { + .driver = { + .name = "tegra-qspi", + .pm = &tegra_qspi_pm_ops, + .of_match_table = tegra_qspi_of_match, + }, + .probe = tegra_qspi_probe, + .remove = tegra_qspi_remove, +}; +module_platform_driver(tegra_qspi_driver); + +MODULE_ALIAS("platform:qspi-tegra"); +MODULE_DESCRIPTION("NVIDIA Tegra QSPI Controller Driver"); +MODULE_AUTHOR("Sowjanya Komatineni "); +MODULE_LICENSE("GPL v2"); -- 2.7.4