[PATCH v6, 8/8] spi: iproc-qspi: Add Broadcom iProc SoCs support
Kamal Dasu
kdasu.kdev at gmail.com
Wed Aug 24 15:04:29 PDT 2016
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 at gmail.com>
Signed-off-by: Yendapally Reddy Dhananjaya Reddy <yendapally.reddy at broadcom.com>
---
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
diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
index 3e753db..2dc1b71 100644
--- a/drivers/spi/Makefile
+++ b/drivers/spi/Makefile
@@ -21,7 +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_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
diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c
index 8fff43e..19995c5 100644
--- a/drivers/spi/spi-bcm-qspi.c
+++ b/drivers/spi/spi-bcm-qspi.c
@@ -176,9 +176,15 @@ 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;
};
@@ -199,6 +205,10 @@ 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;
@@ -807,6 +817,7 @@ static int bcm_qspi_bspi_flash_read(struct spi_device *spi,
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)
@@ -851,6 +862,15 @@ static int bcm_qspi_bspi_flash_read(struct spi_device *spi,
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();
@@ -953,9 +973,12 @@ static irqreturn_t bcm_qspi_mspi_l2_isr(int irq, void *dev_id)
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;
}
@@ -967,20 +990,33 @@ static irqreturn_t bcm_qspi_bspi_lr_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;
+ 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);
@@ -991,13 +1027,39 @@ static irqreturn_t bcm_qspi_bspi_lr_err_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;
+ 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",
@@ -1037,6 +1099,13 @@ static const struct bcm_qspi_irq qspi_irq_tab[] = {
.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)
@@ -1183,7 +1252,13 @@ int bcm_qspi_probe(struct platform_device *pdev,
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_device *pdev,
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 bcm_qspi_resume(struct device *dev)
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);
diff --git a/drivers/spi/spi-bcm-qspi.h b/drivers/spi/spi-bcm-qspi.h
index 65c363b..7abfc75 100644
--- 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 be,
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);
diff --git a/drivers/spi/spi-iproc-qspi.c b/drivers/spi/spi-iproc-qspi.c
new file mode 100644
index 0000000..be6ccb2
--- /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");
--
1.9.1
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