From patchwork Fri Jul 29 22:13:07 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kamal Dasu X-Patchwork-Id: 9252931 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0FD4C6075F for ; Fri, 29 Jul 2016 22:13:43 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F0DD428423 for ; Fri, 29 Jul 2016 22:13:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E54AE28435; Fri, 29 Jul 2016 22:13:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, T_DKIM_INVALID autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5D5D128423 for ; Fri, 29 Jul 2016 22:13:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754028AbcG2WNl (ORCPT ); Fri, 29 Jul 2016 18:13:41 -0400 Received: from mail-pf0-f195.google.com ([209.85.192.195]:34354 "EHLO mail-pf0-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753130AbcG2WNj (ORCPT ); Fri, 29 Jul 2016 18:13:39 -0400 Received: by mail-pf0-f195.google.com with SMTP id g202so6089181pfb.1 for ; Fri, 29 Jul 2016 15:13:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=ciBOHmcUGcR96bEcecJIMKUOrX7NH9iqdySWpQDEDn4=; b=zAboLwUgu2bYIOezeCxTSyC6cGeFx4MBnNIY1jMSD7VyHtAZOH++BnaGd5qDQm1eop Osn88NC9D6P6DGQCdg3hZnWpsII0zokgAdb1KBoplMLS6mRIdcVOI+68L/W9RunMvnrt VWQjz4dnm4Q+Wo48MNDhtPvWHwaICHCD6Kd3LMRXnZRJgu5c0fE+Gpf64G0jeqDgikHa 5waVI6APRBMA8WEgSBndpD2Qe+3k+dpd0ND2E1v43ASScR/ke+4qQqoKO2jDwhgQvI9+ r6Yobc1qZsK5bhDBxM/6mj+G5T19+sGpU2Cv4yeoIeU50+a7eIlaIK1qjI5gDH/YDM5m T4Ig== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=ciBOHmcUGcR96bEcecJIMKUOrX7NH9iqdySWpQDEDn4=; b=hl3qMg9333zpnKxg8rbkYrKOe1lzh74N5kQFzvo7thpnTfAIMCUl6J+KmycTcC/tbs 0CVGgxze2OYH6K+I4gwdlzNklB28ql5YLYbpkYQziKgL6ftE0YDbHL4SFt+kSGAdOwuy rr4U0q7Hz2Tp0vc7TS8B6V/Fv37/didcGmoPKnZX2TerRMbHZFUKvr10F1pRdqqD/kzs Bb5/wjs5Ka9YAmz6kqz5/lL7EDe5E56GHIOuNpA0Xomyy4wpla/gYAOtqnybNtAGcXAt /HmR5MZ2e0niReCWK4nNuyP/mqDYpfZ0Ve0UlcCzvrQehhBSElPrdCf7QBXg78HxmpBj Rxug== X-Gm-Message-State: AEkooutzqmWI9h/tZ0AqMgbvy1frj6e/Z3001vnrYz/Fjg2VtiDxHRgBiYQCTzcz+MwPJw== X-Received: by 10.98.89.210 with SMTP id k79mr72932885pfj.43.1469830418695; Fri, 29 Jul 2016 15:13:38 -0700 (PDT) Received: from mail.broadcom.com ([216.31.219.19]) by smtp.gmail.com with ESMTPSA id zk7sm27207051pac.41.2016.07.29.15.13.35 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 29 Jul 2016 15:13:37 -0700 (PDT) From: Kamal Dasu To: broonie@kernel.org, linux-spi@vger.kernel.org, linux-mtd@lists.infradead.org, vigneshr@ti.com, f.fainelli@gmail.com Cc: bcm-kernel-feedback-list@broadcom.com, vikram.prakash@broadcom.com, andy.fung@broadcom.com, jon.mason@broadcom.com, jchandra@broadcom.com, Kamal Dasu , Yendapally Reddy Dhananjaya Reddy Subject: [PATCH v5 2/8] spi: bcm-qspi: Add Broadcom MSPI driver Date: Fri, 29 Jul 2016 18:13:07 -0400 Message-Id: <1469830393-13295-3-git-send-email-kdasu.kdev@gmail.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1469830393-13295-1-git-send-email-kdasu.kdev@gmail.com> References: <1469830393-13295-1-git-send-email-kdasu.kdev@gmail.com> Sender: linux-spi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Master SPI driver for Broadcom settop SoC. The driver is used for devices that use SPI protocol. Signed-off-by: Kamal Dasu Signed-off-by: Yendapally Reddy Dhananjaya Reddy --- drivers/spi/Kconfig | 10 + drivers/spi/Makefile | 1 + drivers/spi/spi-bcm-qspi.c | 751 +++++++++++++++++++++++++++++++++++++++++ drivers/spi/spi-bcm-qspi.h | 61 ++++ drivers/spi/spi-brcmstb-qspi.c | 53 +++ 5 files changed, 876 insertions(+) create mode 100644 drivers/spi/spi-bcm-qspi.c create mode 100644 drivers/spi/spi-bcm-qspi.h create mode 100644 drivers/spi/spi-brcmstb-qspi.c diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index d6fb8d4..6c95912 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -153,6 +153,16 @@ config SPI_BCM63XX_HSSPI This enables support for the High Speed SPI controller present on newer Broadcom BCM63XX SoCs. +config SPI_BCM_QSPI + tristate "Broadcom BSPI and MSPI controller support" + depends on ARCH_BRCMSTB || ARCH_BCM || ARCH_BCM_NSP || \ + ARCH_BCM_CYGNUS || COMPILE_TEST + help + Enables support for the Broadcom SPI flash and MSPI controller. + Select this option for any one of BRCMSTB, Cygnus, NSP, NS2 SoCs + based platforms. This driver works for both SPI master for spi-nor + flash device as well as MSPI device. + config SPI_BITBANG tristate "Utilities for Bitbanging SPI masters" help diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index 185367e..3e753db 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -21,6 +21,7 @@ obj-$(CONFIG_SPI_BCM2835AUX) += spi-bcm2835aux.o obj-$(CONFIG_SPI_BCM53XX) += spi-bcm53xx.o obj-$(CONFIG_SPI_BCM63XX) += spi-bcm63xx.o obj-$(CONFIG_SPI_BCM63XX_HSSPI) += spi-bcm63xx-hsspi.o +obj-$(CONFIG_SPI_BCM_QSPI) += spi-brcmstb-qspi.o spi-bcm-qspi.o obj-$(CONFIG_SPI_BFIN5XX) += spi-bfin5xx.o obj-$(CONFIG_SPI_ADI_V3) += spi-adi-v3.o obj-$(CONFIG_SPI_BFIN_SPORT) += spi-bfin-sport.o diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c new file mode 100644 index 0000000..fb26709 --- /dev/null +++ b/drivers/spi/spi-bcm-qspi.c @@ -0,0 +1,751 @@ +/* + * Driver for Broadcom BRCMSTB, NSP, NS2, Cygnus SPI Controllers + * + * Copyright 2016 Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation (the "GPL"). + * + * 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 version 2 (GPLv2) for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 (GPLv2) along with this source code. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "spi-bcm-qspi.h" + +#define DRIVER_NAME "bcm_qspi" + +#define BCM_QSPI_STATE_IDLE 0 +#define BCM_QSPI_STATE_RUNNING 1 + +/* MSPI register offsets */ +#define MSPI_SPCR0_LSB 0x000 +#define MSPI_SPCR0_MSB 0x004 +#define MSPI_SPCR1_LSB 0x008 +#define MSPI_SPCR1_MSB 0x00c +#define MSPI_NEWQP 0x010 +#define MSPI_ENDQP 0x014 +#define MSPI_SPCR2 0x018 +#define MSPI_MSPI_STATUS 0x020 +#define MSPI_CPTQP 0x024 +#define MSPI_SPCR3 0x028 +#define MSPI_TXRAM 0x040 +#define MSPI_RXRAM 0x0c0 +#define MSPI_CDRAM 0x140 +#define MSPI_WRITE_LOCK 0x180 + +#define MSPI_MASTER_BIT BIT(7) + +#define MSPI_NUM_CDRAM 16 +#define MSPI_CDRAM_CONT_BIT BIT(7) +#define MSPI_CDRAM_BITSE_BIT BIT(6) +#define MSPI_CDRAM_PCS 0xf + +#define MSPI_SPCR2_SPE BIT(6) +#define MSPI_SPCR2_CONT_AFTER_CMD BIT(7) + +#define MSPI_MSPI_STATUS_SPIF BIT(0) + +#define INTR_BASE_BIT_SHIFT 0x02 +#define INTR_COUNT 0x07 + +#define NUM_CHIPSELECT 4 +#define MSPI_BASE_FREQ 27000000UL +#define QSPI_SPBR_MIN 8U +#define QSPI_SPBR_MAX 255U +#define MAX_SPEED_HZ (MSPI_BASE_FREQ / (QSPI_SPBR_MIN * 2)) + +#define OPCODE_DIOR 0xBB +#define OPCODE_QIOR 0xEB +#define OPCODE_DIOR_4B 0xBC +#define OPCODE_QIOR_4B 0xEC + +#define MAX_CMD_SIZE 6 + +#define ADDR_4MB_MASK GENMASK(22, 0) + +/* stop at end of transfer, no other reason */ +#define TRANS_STATUS_BREAK_NONE 0 +/* stop at end of spi_message */ +#define TRANS_STATUS_BREAK_EOM 1 +/* stop at end of spi_transfer if delay */ +#define TRANS_STATUS_BREAK_DELAY 2 +/* stop at end of spi_transfer if cs_change */ +#define TRANS_STATUS_BREAK_CS_CHANGE 4 +/* stop if we run out of bytes */ +#define TRANS_STATUS_BREAK_NO_BYTES 8 + +/* events that make us stop filling TX slots */ +#define TRANS_STATUS_BREAK_TX (TRANS_STATUS_BREAK_EOM | \ + TRANS_STATUS_BREAK_DELAY | \ + TRANS_STATUS_BREAK_CS_CHANGE) + +/* events that make us deassert CS */ +#define TRANS_STATUS_BREAK_DESELECT (TRANS_STATUS_BREAK_EOM | \ + TRANS_STATUS_BREAK_CS_CHANGE) + +struct bcm_qspi_parms { + u32 speed_hz; + u8 mode; + u8 bits_per_word; +}; + +static const struct bcm_qspi_parms bcm_qspi_default_parms_cs0 = { + .speed_hz = MAX_SPEED_HZ, + .mode = SPI_MODE_3, + .bits_per_word = 8, +}; + +enum base_type { + MSPI, + CHIP_SELECT, + BASEMAX, +}; + +struct bcm_qspi_irq { + const char *irq_name; + const irq_handler_t irq_handler; + u32 mask; +}; + +struct bcm_qspi_dev_id { + const struct bcm_qspi_irq *irqp; + void *dev; +}; + +struct qspi_trans { + struct spi_transfer *trans; + int byte; +}; + +struct bcm_qspi { + struct platform_device *pdev; + struct spi_master *master; + struct clk *clk; + u32 base_clk; + u32 max_speed_hz; + void __iomem *base[BASEMAX]; + struct bcm_qspi_parms last_parms; + struct qspi_trans trans_pos; + int state; + int next_udelay; + int cs_change; + int curr_cs; + u32 s3_strap_override_ctrl; + bool big_endian; + int num_irqs; + struct bcm_qspi_dev_id *dev_ids; + struct completion mspi_done; +}; + +/* Read qspi controller register*/ +static inline u32 bcm_qspi_read(struct bcm_qspi *qspi, enum base_type type, + unsigned int offset) +{ + return bcm_qspi_readl(qspi->pdev, qspi->base[type] + offset); +} + +/* Write qspi controller register*/ +static inline void bcm_qspi_write(struct bcm_qspi *qspi, enum base_type type, + unsigned int offset, unsigned int data) +{ + bcm_qspi_writel(qspi->pdev, data, qspi->base[type] + offset); +} + +static void bcm_qspi_chip_select(struct bcm_qspi *qspi, int cs) +{ + u32 data = 0; + + if (qspi->curr_cs == cs) + return; + if (qspi->base[CHIP_SELECT]) { + data = bcm_qspi_read(qspi, CHIP_SELECT, 0); + data = (data & ~0xff) | (1 << cs); + bcm_qspi_write(qspi, CHIP_SELECT, 0, data); + usleep_range(10, 20); + } + qspi->curr_cs = cs; +} + +/* MSPI helpers */ +static void bcm_qspi_hw_set_parms(struct bcm_qspi *qspi, + const struct bcm_qspi_parms *xp) +{ + u32 spcr, spbr = 0; + + if (xp->speed_hz) + spbr = qspi->base_clk / (2 * xp->speed_hz); + + spcr = clamp_val(spbr, QSPI_SPBR_MIN, QSPI_SPBR_MAX); + bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_LSB, spcr); + + spcr = MSPI_MASTER_BIT; + /* for 16 bit the data should be zero */ + if (xp->bits_per_word != 16) + spcr |= xp->bits_per_word << 2; + spcr |= xp->mode & 3; + bcm_qspi_write(qspi, MSPI, MSPI_SPCR0_MSB, spcr); + + qspi->last_parms = *xp; +} + +static void bcm_qspi_update_parms(struct bcm_qspi *qspi, + struct spi_device *spi, + struct spi_transfer *trans) +{ + struct bcm_qspi_parms xp; + + xp.speed_hz = trans->speed_hz; + xp.bits_per_word = trans->bits_per_word; + xp.mode = spi->mode; + + bcm_qspi_hw_set_parms(qspi, &xp); +} + +static int bcm_qspi_setup(struct spi_device *spi) +{ + struct bcm_qspi_parms *xp; + + if (spi->bits_per_word > 16) + return -EINVAL; + + xp = spi_get_ctldata(spi); + if (!xp) { + xp = kzalloc(sizeof(*xp), GFP_KERNEL); + if (!xp) + return -ENOMEM; + spi_set_ctldata(spi, xp); + } + xp->speed_hz = spi->max_speed_hz; + xp->mode = spi->mode; + + if (spi->bits_per_word) + xp->bits_per_word = spi->bits_per_word; + else + xp->bits_per_word = 8; + + return 0; +} + +static int update_qspi_trans_byte_count(struct bcm_qspi *qspi, + struct qspi_trans *qt, int flags) +{ + int ret = TRANS_STATUS_BREAK_NONE; + + /* count the last transferred bytes */ + if (qt->trans->bits_per_word <= 8) + qt->byte++; + else + qt->byte += 2; + + if (qt->byte >= qt->trans->len) { + /* we're at the end of the spi_transfer */ + + /* in TX mode, need to pause for a delay or CS change */ + if (qt->trans->delay_usecs && + (flags & TRANS_STATUS_BREAK_DELAY)) + ret |= TRANS_STATUS_BREAK_DELAY; + if (qt->trans->cs_change && + (flags & TRANS_STATUS_BREAK_CS_CHANGE)) + ret |= TRANS_STATUS_BREAK_CS_CHANGE; + if (ret) + goto done; + + dev_dbg(&qspi->pdev->dev, "advance msg exit\n"); + if (spi_transfer_is_last(qspi->master, qt->trans)) + ret = TRANS_STATUS_BREAK_EOM; + else + ret = TRANS_STATUS_BREAK_NO_BYTES; + + qt->trans = NULL; + } + +done: + dev_dbg(&qspi->pdev->dev, "trans %p len %d byte %d ret %x\n", + qt->trans, qt->trans ? qt->trans->len : 0, qt->byte, ret); + return ret; +} + +static inline u8 read_rxram_slot_u8(struct bcm_qspi *qspi, int slot) +{ + u32 slot_offset = MSPI_RXRAM + (slot << 3) + 0x4; + + /* mask out reserved bits */ + return bcm_qspi_read(qspi, MSPI, slot_offset) & 0xff; +} + +static inline u16 read_rxram_slot_u16(struct bcm_qspi *qspi, int slot) +{ + u32 reg_offset = MSPI_RXRAM; + u32 lsb_offset = reg_offset + (slot << 3) + 0x4; + u32 msb_offset = reg_offset + (slot << 3); + + return (bcm_qspi_read(qspi, MSPI, lsb_offset) & 0xff) | + ((bcm_qspi_read(qspi, MSPI, msb_offset) & 0xff) << 8); +} + +static void read_from_hw(struct bcm_qspi *qspi, int slots) +{ + struct qspi_trans tp; + int slot; + + if (slots > MSPI_NUM_CDRAM) { + /* should never happen */ + dev_err(&qspi->pdev->dev, "%s: too many slots!\n", __func__); + return; + } + + tp = qspi->trans_pos; + + for (slot = 0; slot < slots; slot++) { + if (tp.trans->bits_per_word <= 8) { + u8 *buf = tp.trans->rx_buf; + + if (buf) + buf[tp.byte] = read_rxram_slot_u8(qspi, slot); + dev_dbg(&qspi->pdev->dev, "RD %02x\n", + buf ? buf[tp.byte] : 0xff); + } else { + u16 *buf = tp.trans->rx_buf; + + if (buf) + buf[tp.byte / 2] = read_rxram_slot_u16(qspi, + slot); + dev_dbg(&qspi->pdev->dev, "RD %04x\n", + buf ? buf[tp.byte] : 0xffff); + } + + update_qspi_trans_byte_count(qspi, &tp, + TRANS_STATUS_BREAK_NONE); + } + + qspi->trans_pos = tp; +} + +static inline void write_txram_slot_u8(struct bcm_qspi *qspi, int slot, + u8 val) +{ + u32 reg_offset = MSPI_TXRAM + (slot << 3); + + /* mask out reserved bits */ + bcm_qspi_write(qspi, MSPI, reg_offset, val); +} + +static inline void write_txram_slot_u16(struct bcm_qspi *qspi, int slot, + u16 val) +{ + u32 reg_offset = MSPI_TXRAM; + u32 msb_offset = reg_offset + (slot << 3); + u32 lsb_offset = reg_offset + (slot << 3) + 0x4; + + bcm_qspi_write(qspi, MSPI, msb_offset, (val >> 8)); + bcm_qspi_write(qspi, MSPI, lsb_offset, (val & 0xff)); +} + +static inline u32 read_cdram_slot(struct bcm_qspi *qspi, int slot) +{ + return bcm_qspi_read(qspi, MSPI, MSPI_CDRAM + (slot << 2)); +} + +static inline void write_cdram_slot(struct bcm_qspi *qspi, int slot, u32 val) +{ + bcm_qspi_write(qspi, MSPI, (MSPI_CDRAM + (slot << 2)), val); +} + +/* Return number of slots written */ +static int write_to_hw(struct bcm_qspi *qspi, struct spi_device *spi) +{ + struct qspi_trans tp; + int slot = 0, tstatus = 0; + u32 mspi_cdram = 0; + + tp = qspi->trans_pos; + bcm_qspi_update_parms(qspi, spi, tp.trans); + + /* Run until end of transfer or reached the max data */ + while (!tstatus && slot < MSPI_NUM_CDRAM) { + if (tp.trans->bits_per_word <= 8) { + const u8 *buf = tp.trans->tx_buf; + u8 val = buf ? buf[tp.byte] : 0xff; + + write_txram_slot_u8(qspi, slot, val); + dev_dbg(&qspi->pdev->dev, "WR %02x\n", val); + } else { + const u16 *buf = tp.trans->tx_buf; + u16 val = buf ? buf[tp.byte / 2] : 0xffff; + + write_txram_slot_u16(qspi, slot, val); + dev_dbg(&qspi->pdev->dev, "WR %04x\n", val); + } + mspi_cdram = MSPI_CDRAM_CONT_BIT; + mspi_cdram |= (~(1 << spi->chip_select) & + MSPI_CDRAM_PCS); + mspi_cdram |= ((tp.trans->bits_per_word <= 8) ? 0 : + MSPI_CDRAM_BITSE_BIT); + + write_cdram_slot(qspi, slot, mspi_cdram); + + tstatus = update_qspi_trans_byte_count(qspi, &tp, + TRANS_STATUS_BREAK_TX); + slot++; + } + if (!slot) { + dev_err(&qspi->pdev->dev, "%s: no data to send?", __func__); + goto done; + } + + /* in TX mode, need to pause for a delay or CS change */ + if (tstatus & TRANS_STATUS_BREAK_CS_CHANGE) + qspi->cs_change = 1; + if (tstatus & TRANS_STATUS_BREAK_DELAY) + qspi->next_udelay = tp.trans->delay_usecs; + + dev_dbg(&qspi->pdev->dev, "submitting %d slots\n", slot); + bcm_qspi_write(qspi, MSPI, MSPI_NEWQP, 0); + bcm_qspi_write(qspi, MSPI, MSPI_ENDQP, slot - 1); + + if (tstatus & TRANS_STATUS_BREAK_DESELECT) { + mspi_cdram = read_cdram_slot(qspi, slot - 1) & + ~MSPI_CDRAM_CONT_BIT; + write_cdram_slot(qspi, slot - 1, mspi_cdram); + } + + /* Must flush previous writes before starting MSPI operation */ + mb(); + /* Set cont | spe | spifie */ + bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0xe0); + qspi->state = BCM_QSPI_STATE_RUNNING; + +done: + return slot; +} + +static void hw_stop(struct bcm_qspi *qspi) +{ + qspi->state = BCM_QSPI_STATE_IDLE; +} + +static int bcm_qspi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *trans) +{ + struct bcm_qspi *qspi = spi_master_get_devdata(master); + int slots; + unsigned long timeo = msecs_to_jiffies(100); + + bcm_qspi_chip_select(qspi, spi->chip_select); + qspi->trans_pos.trans = trans; + qspi->trans_pos.byte = 0; + + while (qspi->trans_pos.byte < trans->len) { + reinit_completion(&qspi->mspi_done); + + slots = write_to_hw(qspi, spi); + if (!wait_for_completion_timeout(&qspi->mspi_done, timeo)) { + dev_err(&qspi->pdev->dev, "timeout waiting for MSPI\n"); + return -ETIMEDOUT; + } + + if (qspi->next_udelay) { + udelay(qspi->next_udelay); + qspi->next_udelay = 0; + } + + read_from_hw(qspi, slots); + if (qspi->cs_change) { + usleep_range(10, 20); + qspi->cs_change = 0; + } + } + + if (spi_transfer_is_last(master, trans)) + hw_stop(qspi); + + return 0; +} + +static void bcm_qspi_cleanup(struct spi_device *spi) +{ + struct bcm_qspi_parms *xp = spi_get_ctldata(spi); + + kfree(xp); +} + +static irqreturn_t bcm_qspi_mspi_l2_isr(int irq, void *dev_id) +{ + struct bcm_qspi_dev_id *qspi_dev_id = dev_id; + struct bcm_qspi *qspi = qspi_dev_id->dev; + u32 status = bcm_qspi_read(qspi, MSPI, MSPI_MSPI_STATUS); + + if (status & MSPI_MSPI_STATUS_SPIF) { + /* clear interrupt */ + status &= ~MSPI_MSPI_STATUS_SPIF; + bcm_qspi_write(qspi, MSPI, MSPI_MSPI_STATUS, status); + complete(&qspi->mspi_done); + return IRQ_HANDLED; + } else { + return IRQ_NONE; + } +} + +static const struct bcm_qspi_irq qspi_irq_tab[] = { + { + .irq_name = "mspi_done", + .irq_handler = bcm_qspi_mspi_l2_isr, + .mask = INTR_MSPI_DONE_MASK, + }, + { + .irq_name = "mspi_halted", + .irq_handler = bcm_qspi_mspi_l2_isr, + .mask = INTR_MSPI_HALTED_MASK, + }, +}; + +static void bcm_qspi_hw_init(struct bcm_qspi *qspi) +{ + u32 val = 0; + struct bcm_qspi_parms parms; + + bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_LSB, 0); + bcm_qspi_write(qspi, MSPI, MSPI_SPCR1_MSB, 0); + bcm_qspi_write(qspi, MSPI, MSPI_NEWQP, 0); + bcm_qspi_write(qspi, MSPI, MSPI_ENDQP, 0); + bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0x20); + + parms.mode = SPI_MODE_3; + parms.bits_per_word = 8; + of_property_read_u32(qspi->pdev->dev.of_node, "clock-frequency", &val); + if (val > 0) { + parms.speed_hz = val; + bcm_qspi_hw_set_parms(qspi, &parms); + } else { + bcm_qspi_hw_set_parms(qspi, &bcm_qspi_default_parms_cs0); + } + +} + +static void bcm_qspi_hw_uninit(struct bcm_qspi *qspi) +{ + bcm_qspi_write(qspi, MSPI, MSPI_SPCR2, 0); +} + +static const struct of_device_id bcm_qspi_of_match[] = { + { .compatible = "brcm,spi-bcm-qspi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm_qspi_of_match); + +int bcm_qspi_probe(struct platform_device *pdev, struct bcm_qspi_soc *soc) +{ + struct device *dev = &pdev->dev; + struct bcm_qspi *qspi; + struct spi_master *master; + struct resource *res; + int irq, ret = 0, num_ints = 0; + u32 val; + const char *name = NULL; + int num_irqs = ARRAY_SIZE(qspi_irq_tab); + + /* We only support device-tree instantiation */ + if (!dev->of_node) + return -ENODEV; + + if (!of_match_node(bcm_qspi_of_match, dev->of_node)) + return -ENODEV; + + master = spi_alloc_master(dev, sizeof(struct bcm_qspi)); + if (!master) { + dev_err(dev, "error allocating spi_master\n"); + return -ENOMEM; + } + + qspi = spi_master_get_devdata(master); + qspi->pdev = pdev; + qspi->state = BCM_QSPI_STATE_IDLE; + qspi->trans_pos.trans = NULL; + qspi->trans_pos.byte = 0; + qspi->master = master; + + master->bus_num = -1; + master->mode_bits = SPI_CPHA | SPI_CPOL | SPI_RX_DUAL | SPI_RX_QUAD; + master->setup = bcm_qspi_setup; + master->transfer_one = bcm_qspi_transfer_one; + master->cleanup = bcm_qspi_cleanup; + master->dev.of_node = dev->of_node; + master->num_chipselect = NUM_CHIPSELECT; + + qspi->big_endian = of_device_is_big_endian(dev->of_node); + + if (!of_property_read_u32(dev->of_node, "num-cs", &val)) + master->num_chipselect = val; + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hif_mspi"); + if (!res) + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "mspi"); + + if (res) { + qspi->base[MSPI] = devm_ioremap_resource(dev, res); + if (IS_ERR(qspi->base[MSPI])) { + ret = PTR_ERR(qspi->base[MSPI]); + goto err2; + } + } else { + goto err2; + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cs_reg"); + if (res) { + qspi->base[CHIP_SELECT] = devm_ioremap_resource(dev, res); + if (IS_ERR(qspi->base[CHIP_SELECT])) { + ret = PTR_ERR(qspi->base[CHIP_SELECT]); + goto err2; + } + } + + qspi->dev_ids = kcalloc(num_irqs, sizeof(struct bcm_qspi_dev_id), + GFP_KERNEL); + if (IS_ERR(qspi->dev_ids)) { + ret = PTR_ERR(qspi->dev_ids); + goto err2; + } + + for (val = 0; val < num_irqs; val++) { + irq = -1; + name = qspi_irq_tab[val].irq_name; + irq = platform_get_irq_byname(pdev, name); + + if (irq >= 0) { + ret = devm_request_irq(&pdev->dev, irq, + qspi_irq_tab[val].irq_handler, 0, + name, + &qspi->dev_ids[val]); + if (ret < 0) { + dev_err(&pdev->dev, "IRQ %s not found\n", name); + goto err2; + } + + qspi->dev_ids[val].dev = qspi; + qspi->dev_ids[val].irqp = &qspi_irq_tab[val]; + num_ints++; + dev_dbg(&pdev->dev, "registered IRQ %s %d\n", + qspi_irq_tab[val].irq_name, + irq); + } + } + + if (!num_ints) { + dev_err(&pdev->dev, "no IRQs registered, cannot init driver\n"); + goto err2; + } + + qspi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(qspi->clk)) { + dev_warn(dev, "unable to get clock\n"); + goto err2; + } + + ret = clk_prepare_enable(qspi->clk); + if (ret) { + dev_err(dev, "failed to prepare clock\n"); + goto err2; + } + + qspi->base_clk = clk_get_rate(qspi->clk); + qspi->max_speed_hz = qspi->base_clk / (QSPI_SPBR_MIN * 2); + + bcm_qspi_hw_init(qspi); + init_completion(&qspi->mspi_done); + qspi->curr_cs = -1; + + platform_set_drvdata(pdev, qspi); + ret = devm_spi_register_master(&pdev->dev, master); + if (ret < 0) { + dev_err(dev, "can't register master\n"); + goto err1; + } + + return 0; + +err1: + bcm_qspi_hw_uninit(qspi); + clk_disable_unprepare(qspi->clk); +err2: + spi_master_put(master); + kfree(qspi->dev_ids); + return ret; +} +EXPORT_SYMBOL_GPL(bcm_qspi_probe); + +int bcm_qspi_remove(struct platform_device *pdev) +{ + struct bcm_qspi *qspi = platform_get_drvdata(pdev); + + platform_set_drvdata(pdev, NULL); + bcm_qspi_hw_uninit(qspi); + clk_disable_unprepare(qspi->clk); + kfree(qspi->dev_ids); + spi_unregister_master(qspi->master); + + return 0; +} +EXPORT_SYMBOL_GPL(bcm_qspi_remove); + +#ifdef CONFIG_PM_SLEEP +static int bcm_qspi_suspend(struct device *dev) +{ + struct bcm_qspi *qspi = dev_get_drvdata(dev); + + clk_disable(qspi->clk); + return 0; +}; + +static int bcm_qspi_resume(struct device *dev) +{ + struct bcm_qspi *qspi = dev_get_drvdata(dev); + int curr_cs = qspi->curr_cs; + int ret = 0; + + bcm_qspi_hw_init(qspi); + qspi->curr_cs = -1; + bcm_qspi_chip_select(qspi, curr_cs); + + ret = clk_enable(qspi->clk); + + return ret; +} +#endif /* CONFIG_PM_SLEEP */ + +const struct dev_pm_ops bcm_qspi_pm_ops = { + .suspend = bcm_qspi_suspend, + .resume = bcm_qspi_resume, +}; +EXPORT_SYMBOL_GPL(bcm_qspi_pm_ops); + +MODULE_AUTHOR("Kamal Dasu"); +MODULE_DESCRIPTION("Broadcom QSPI driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRIVER_NAME); diff --git a/drivers/spi/spi-bcm-qspi.h b/drivers/spi/spi-bcm-qspi.h new file mode 100644 index 0000000..0bdddd4 --- /dev/null +++ b/drivers/spi/spi-bcm-qspi.h @@ -0,0 +1,61 @@ +/* + * Copyright 2016 Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation (the "GPL"). + * + * 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 version 2 (GPLv2) for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 (GPLv2) along with this source code. + */ + +#ifndef __SPI_BCM_QSPI_H__ +#define __SPI_BCM_QSPI_H__ + +#include +#include + +/* MSPI Interrupt masks */ +#define INTR_MSPI_HALTED_MASK BIT(6) +#define INTR_MSPI_DONE_MASK BIT(5) + +#define MSPI_INTERRUPTS_ALL \ + (INTR_MSPI_DONE_MASK | \ + INTR_MSPI_HALTED_MASK) + +struct platform_device; +struct dev_pm_ops; + +struct bcm_qspi_soc; + +/* Read controller register*/ +static inline u32 bcm_qspi_readl(struct platform_device *pdev, + void __iomem *addr) +{ + if (of_device_is_big_endian(pdev->dev.of_node)) + return ioread32be(addr); + else + return readl_relaxed(addr); +} + +/* Write controller register*/ +static inline void bcm_qspi_writel(struct platform_device *pdev, + unsigned int data, void __iomem *addr) +{ + if (of_device_is_big_endian(pdev->dev.of_node)) + iowrite32be(data, addr); + else + writel_relaxed(data, addr); +} + +int bcm_qspi_probe(struct platform_device *pdev, struct bcm_qspi_soc *soc); +int bcm_qspi_remove(struct platform_device *pdev); + +extern const struct dev_pm_ops bcm_qspi_pm_ops; + +#endif /* __SPI_BCM_QSPI_H__ */ diff --git a/drivers/spi/spi-brcmstb-qspi.c b/drivers/spi/spi-brcmstb-qspi.c new file mode 100644 index 0000000..c7df92e --- /dev/null +++ b/drivers/spi/spi-brcmstb-qspi.c @@ -0,0 +1,53 @@ +/* + * Copyright 2016 Broadcom + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation (the "GPL"). + * + * 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 version 2 (GPLv2) for more details. + * + * You should have received a copy of the GNU General Public License + * version 2 (GPLv2) along with this source code. + */ + +#include +#include +#include +#include +#include "spi-bcm-qspi.h" + +static const struct of_device_id brcmstb_qspi_of_match[] = { + { .compatible = "brcm,spi-brcmstb-qspi" }, + { .compatible = "brcm,spi-brcmstb-mspi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, brcmstb_qspi_of_match); + +static int brcmstb_qspi_probe(struct platform_device *pdev) +{ + return bcm_qspi_probe(pdev, NULL); +} + +static int brcmstb_qspi_remove(struct platform_device *pdev) +{ + return bcm_qspi_remove(pdev); +} + +static struct platform_driver brcmstb_qspi_driver = { + .probe = brcmstb_qspi_probe, + .remove = brcmstb_qspi_remove, + .driver = { + .name = "brcmstb_qspi", + .pm = &bcm_qspi_pm_ops, + .of_match_table = brcmstb_qspi_of_match, + } +}; +module_platform_driver(brcmstb_qspi_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Kamal Dasu"); +MODULE_DESCRIPTION("Broadcom SPI driver for settop SoC");