From cc20a38612dbc87dc7396affc9758e3bfbe92340 Mon Sep 17 00:00:00 2001 From: Kamal Dasu <kdasu.kdev@gmail.com> Date: Wed, 24 Aug 2016 18:04:29 -0400 Subject: [PATCH] spi: iproc-qspi: Add Broadcom iProc SoCs support This spi driver uses the common spi-bcm-qspi driver and implements iProc SoCs specific interrupt controller. The common driver now calls the SoC handlers when present. Adding support for both muxed l1 and unmuxed interrupt sources. Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com> Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy@broadcom.com> Signed-off-by: Mark Brown <broonie@kernel.org> --- drivers/spi/Makefile | 2 +- drivers/spi/spi-bcm-qspi.c | 97 ++++++++++++++++++++++++- drivers/spi/spi-bcm-qspi.h | 34 ++++++++- drivers/spi/spi-iproc-qspi.c | 163 +++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 291 insertions(+), 5 deletions(-) create mode 100644 drivers/spi/spi-iproc-qspi.c --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -19,7 +19,7 @@ obj-$(CONFIG_SPI_BCM2835AUX) += spi-bcm obj-$(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_BCM_QSPI) += spi-iproc-qspi.o 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 --- a/drivers/spi/spi-bcm-qspi.c +++ b/drivers/spi/spi-bcm-qspi.c @@ -175,9 +175,15 @@ enum base_type { BASEMAX, }; +enum irq_source { + SINGLE_L2, + MUXED_L1, +}; + struct bcm_qspi_irq { const char *irq_name; const irq_handler_t irq_handler; + int irq_source; u32 mask; }; @@ -198,6 +204,10 @@ struct bcm_qspi { u32 base_clk; u32 max_speed_hz; void __iomem *base[BASEMAX]; + + /* Some SoCs provide custom interrupt status register(s) */ + struct bcm_qspi_soc_intc *soc_intc; + struct bcm_qspi_parms last_parms; struct qspi_trans trans_pos; int curr_cs; @@ -806,6 +816,7 @@ static int bcm_qspi_bspi_flash_read(stru u32 addr = 0, len, len_words; int ret = 0; unsigned long timeo = msecs_to_jiffies(100); + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; if (bcm_qspi_bspi_ver_three(qspi)) if (msg->addr_width == BSPI_ADDRLEN_4BYTES) @@ -850,6 +861,15 @@ static int bcm_qspi_bspi_flash_read(stru bcm_qspi_write(qspi, BSPI, BSPI_RAF_NUM_WORDS, len_words); bcm_qspi_write(qspi, BSPI, BSPI_RAF_WATERMARK, 0); + if (qspi->soc_intc) { + /* + * clear soc MSPI and BSPI interrupts and enable + * BSPI interrupts. + */ + soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_BSPI_DONE); + soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, true); + } + /* Must flush previous writes before starting BSPI operation */ mb(); @@ -952,9 +972,12 @@ static irqreturn_t bcm_qspi_mspi_l2_isr( u32 status = bcm_qspi_read(qspi, MSPI, MSPI_MSPI_STATUS); if (status & MSPI_MSPI_STATUS_SPIF) { + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; /* clear interrupt */ status &= ~MSPI_MSPI_STATUS_SPIF; bcm_qspi_write(qspi, MSPI, MSPI_MSPI_STATUS, status); + if (qspi->soc_intc) + soc_intc->bcm_qspi_int_ack(soc_intc, MSPI_DONE); complete(&qspi->mspi_done); return IRQ_HANDLED; } @@ -966,20 +989,33 @@ static irqreturn_t bcm_qspi_bspi_lr_l2_i { struct bcm_qspi_dev_id *qspi_dev_id = dev_id; struct bcm_qspi *qspi = qspi_dev_id->dev; - u32 status; + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; + u32 status = qspi_dev_id->irqp->mask; if (qspi->bspi_enabled && qspi->bspi_rf_msg) { bcm_qspi_bspi_lr_data_read(qspi); if (qspi->bspi_rf_msg_len == 0) { qspi->bspi_rf_msg = NULL; + if (qspi->soc_intc) { + /* disable soc BSPI interrupt */ + soc_intc->bcm_qspi_int_set(soc_intc, BSPI_DONE, + false); + /* indicate done */ + status = INTR_BSPI_LR_SESSION_DONE_MASK; + } + if (qspi->bspi_rf_msg_status) bcm_qspi_bspi_lr_clear(qspi); else bcm_qspi_bspi_flush_prefetch_buffers(qspi); } + + if (qspi->soc_intc) + /* clear soc BSPI interrupt */ + soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_DONE); } - status = (qspi_dev_id->irqp->mask & INTR_BSPI_LR_SESSION_DONE_MASK); + status &= INTR_BSPI_LR_SESSION_DONE_MASK; if (qspi->bspi_enabled && status && qspi->bspi_rf_msg_len == 0) complete(&qspi->bspi_done); @@ -990,13 +1026,39 @@ static irqreturn_t bcm_qspi_bspi_lr_err_ { struct bcm_qspi_dev_id *qspi_dev_id = dev_id; struct bcm_qspi *qspi = qspi_dev_id->dev; + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; dev_err(&qspi->pdev->dev, "BSPI INT error\n"); qspi->bspi_rf_msg_status = -EIO; + if (qspi->soc_intc) + /* clear soc interrupt */ + soc_intc->bcm_qspi_int_ack(soc_intc, BSPI_ERR); + complete(&qspi->bspi_done); return IRQ_HANDLED; } +static irqreturn_t bcm_qspi_l1_isr(int irq, void *dev_id) +{ + struct bcm_qspi_dev_id *qspi_dev_id = dev_id; + struct bcm_qspi *qspi = qspi_dev_id->dev; + struct bcm_qspi_soc_intc *soc_intc = qspi->soc_intc; + irqreturn_t ret = IRQ_NONE; + + if (soc_intc) { + u32 status = soc_intc->bcm_qspi_get_int_status(soc_intc); + + if (status & MSPI_DONE) + ret = bcm_qspi_mspi_l2_isr(irq, dev_id); + else if (status & BSPI_DONE) + ret = bcm_qspi_bspi_lr_l2_isr(irq, dev_id); + else if (status & BSPI_ERR) + ret = bcm_qspi_bspi_lr_err_l2_isr(irq, dev_id); + } + + return ret; +} + static const struct bcm_qspi_irq qspi_irq_tab[] = { { .irq_name = "spi_lr_fullness_reached", @@ -1036,6 +1098,13 @@ static const struct bcm_qspi_irq qspi_ir .irq_handler = bcm_qspi_mspi_l2_isr, .mask = INTR_MSPI_HALTED_MASK, }, + { + /* single muxed L1 interrupt source */ + .irq_name = "spi_l1_intr", + .irq_handler = bcm_qspi_l1_isr, + .irq_source = MUXED_L1, + .mask = QSPI_INTERRUPTS_ALL, + }, }; static void bcm_qspi_bspi_init(struct bcm_qspi *qspi) @@ -1182,7 +1251,13 @@ int bcm_qspi_probe(struct platform_devic for (val = 0; val < num_irqs; val++) { irq = -1; name = qspi_irq_tab[val].irq_name; - irq = platform_get_irq_byname(pdev, name); + if (qspi_irq_tab[val].irq_source == SINGLE_L2) { + /* get the l2 interrupts */ + irq = platform_get_irq_byname(pdev, name); + } else if (!num_ints && soc_intc) { + /* all mspi, bspi intrs muxed to one L1 intr */ + irq = platform_get_irq(pdev, 0); + } if (irq >= 0) { ret = devm_request_irq(&pdev->dev, irq, @@ -1209,6 +1284,17 @@ int bcm_qspi_probe(struct platform_devic goto qspi_probe_err; } + /* + * Some SoCs integrate spi controller (e.g., its interrupt bits) + * in specific ways + */ + if (soc_intc) { + qspi->soc_intc = soc_intc; + soc_intc->bcm_qspi_int_set(soc_intc, MSPI_DONE, true); + } else { + qspi->soc_intc = NULL; + } + qspi->clk = devm_clk_get(&pdev->dev, NULL); if (IS_ERR(qspi->clk)) { dev_warn(dev, "unable to get clock\n"); @@ -1288,6 +1374,11 @@ static int __maybe_unused bcm_qspi_resum bcm_qspi_hw_init(qspi); bcm_qspi_chip_select(qspi, qspi->curr_cs); + if (qspi->soc_intc) + /* enable MSPI interrupt */ + qspi->soc_intc->bcm_qspi_int_set(qspi->soc_intc, MSPI_DONE, + true); + ret = clk_enable(qspi->clk); if (!ret) spi_master_resume(qspi->master); --- a/drivers/spi/spi-bcm-qspi.h +++ b/drivers/spi/spi-bcm-qspi.h @@ -48,10 +48,26 @@ (INTR_MSPI_DONE_MASK | \ INTR_MSPI_HALTED_MASK) +#define QSPI_INTERRUPTS_ALL \ + (MSPI_INTERRUPTS_ALL | \ + BSPI_LR_INTERRUPTS_ALL) + struct platform_device; struct dev_pm_ops; -struct bcm_qspi_soc_intc; +enum { + MSPI_DONE = 0x1, + BSPI_DONE = 0x2, + BSPI_ERR = 0x4, + MSPI_BSPI_DONE = 0x7 +}; + +struct bcm_qspi_soc_intc { + void (*bcm_qspi_int_ack)(struct bcm_qspi_soc_intc *soc_intc, int type); + void (*bcm_qspi_int_set)(struct bcm_qspi_soc_intc *soc_intc, int type, + bool en); + u32 (*bcm_qspi_get_int_status)(struct bcm_qspi_soc_intc *soc_intc); +}; /* Read controller register*/ static inline u32 bcm_qspi_readl(bool be, void __iomem *addr) @@ -72,6 +88,22 @@ static inline void bcm_qspi_writel(bool writel_relaxed(data, addr); } +static inline u32 get_qspi_mask(int type) +{ + switch (type) { + case MSPI_DONE: + return INTR_MSPI_DONE_MASK; + case BSPI_DONE: + return BSPI_LR_INTERRUPTS_ALL; + case MSPI_BSPI_DONE: + return QSPI_INTERRUPTS_ALL; + case BSPI_ERR: + return BSPI_LR_INTERRUPTS_ERROR; + } + + return 0; +} + /* The common driver functions to be called by the SoC platform driver */ int bcm_qspi_probe(struct platform_device *pdev, struct bcm_qspi_soc_intc *soc_intc); --- /dev/null +++ b/drivers/spi/spi-iproc-qspi.c @@ -0,0 +1,163 @@ +/* + * Copyright 2016 Broadcom Limited + * + * 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. + * + * 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/device.h> +#include <linux/io.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#include "spi-bcm-qspi.h" + +#define INTR_BASE_BIT_SHIFT 0x02 +#define INTR_COUNT 0x07 + +struct bcm_iproc_intc { + struct bcm_qspi_soc_intc soc_intc; + struct platform_device *pdev; + void __iomem *int_reg; + void __iomem *int_status_reg; + spinlock_t soclock; + bool big_endian; +}; + +static u32 bcm_iproc_qspi_get_l2_int_status(struct bcm_qspi_soc_intc *soc_intc) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_status_reg; + int i; + u32 val = 0, sts = 0; + + for (i = 0; i < INTR_COUNT; i++) { + if (bcm_qspi_readl(priv->big_endian, mmio + (i * 4))) + val |= 1UL << i; + } + + if (val & INTR_MSPI_DONE_MASK) + sts |= MSPI_DONE; + + if (val & BSPI_LR_INTERRUPTS_ALL) + sts |= BSPI_DONE; + + if (val & BSPI_LR_INTERRUPTS_ERROR) + sts |= BSPI_ERR; + + return sts; +} + +static void bcm_iproc_qspi_int_ack(struct bcm_qspi_soc_intc *soc_intc, int type) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_status_reg; + u32 mask = get_qspi_mask(type); + int i; + + for (i = 0; i < INTR_COUNT; i++) { + if (mask & (1UL << i)) + bcm_qspi_writel(priv->big_endian, 1, mmio + (i * 4)); + } +} + +static void bcm_iproc_qspi_int_set(struct bcm_qspi_soc_intc *soc_intc, int type, + bool en) +{ + struct bcm_iproc_intc *priv = + container_of(soc_intc, struct bcm_iproc_intc, soc_intc); + void __iomem *mmio = priv->int_reg; + u32 mask = get_qspi_mask(type); + u32 val; + unsigned long flags; + + spin_lock_irqsave(&priv->soclock, flags); + + val = bcm_qspi_readl(priv->big_endian, mmio); + + if (en) + val = val | (mask << INTR_BASE_BIT_SHIFT); + else + val = val & ~(mask << INTR_BASE_BIT_SHIFT); + + bcm_qspi_writel(priv->big_endian, val, mmio); + + spin_unlock_irqrestore(&priv->soclock, flags); +} + +static int bcm_iproc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct bcm_iproc_intc *priv; + struct bcm_qspi_soc_intc *soc_intc; + struct resource *res; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + soc_intc = &priv->soc_intc; + priv->pdev = pdev; + + spin_lock_init(&priv->soclock); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr_regs"); + priv->int_reg = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->int_reg)) + return PTR_ERR(priv->int_reg); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, + "intr_status_reg"); + priv->int_status_reg = devm_ioremap_resource(dev, res); + if (IS_ERR(priv->int_status_reg)) + return PTR_ERR(priv->int_status_reg); + + priv->big_endian = of_device_is_big_endian(dev->of_node); + + bcm_iproc_qspi_int_ack(soc_intc, MSPI_BSPI_DONE); + bcm_iproc_qspi_int_set(soc_intc, MSPI_BSPI_DONE, false); + + soc_intc->bcm_qspi_int_ack = bcm_iproc_qspi_int_ack; + soc_intc->bcm_qspi_int_set = bcm_iproc_qspi_int_set; + soc_intc->bcm_qspi_get_int_status = bcm_iproc_qspi_get_l2_int_status; + + return bcm_qspi_probe(pdev, soc_intc); +} + +static int bcm_iproc_remove(struct platform_device *pdev) +{ + return bcm_qspi_remove(pdev); +} + +static const struct of_device_id bcm_iproc_of_match[] = { + { .compatible = "brcm,spi-nsp-qspi" }, + { .compatible = "brcm,spi-ns2-qspi" }, + {}, +}; +MODULE_DEVICE_TABLE(of, bcm_iproc_of_match); + +static struct platform_driver bcm_iproc_driver = { + .probe = bcm_iproc_probe, + .remove = bcm_iproc_remove, + .driver = { + .name = "bcm_iproc", + .pm = &bcm_qspi_pm_ops, + .of_match_table = bcm_iproc_of_match, + } +}; +module_platform_driver(bcm_iproc_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Kamal Dasu"); +MODULE_DESCRIPTION("SPI flash driver for Broadcom iProc SoCs");