[PATCH 3/3] mailbox: sophgo: add mailbox driver for cv18x SoCs

Yuntao Dai
2024-06-18T15:13:34Z

Add mailbox controller driver for cv18x SoCs, tested on mailbox-test
client.

Signed-off-by: Yuntao Dai <d1581209858@live.com>
---
drivers/mailbox/Kconfig | 11 ++
drivers/mailbox/Makefile | 2 +
drivers/mailbox/cv1800b-mailbox.c | 181 ++++++++++++++++++++++++++++++
3 files changed, 194 insertions(+)
create mode 100644 drivers/mailbox/cv1800b-mailbox.c

diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
index 3b8842c4a..4e5593861 100644
--- a/drivers/mailbox/Kconfig
+++ b/drivers/mailbox/Kconfig
@@ -286,4 +286,15 @@ config QCOM_IPCC
acts as an interrupt controller for receiving interrupts from clients.
Say Y here if you want to build this driver.

+config CV1800B_MBOX
+ tristate "cv1800b mailbox"
+ depends on OF
+ depends on ARCH_SOPHGO || COMPILE_TEST
+ help
+ Mailbox driver implementation for Sophgo cv180x SoCs. This driver
+ can be used to send message between different processors in SoC. Any
+ processer can write data in a channel, and set co-responding register
+ to raise interrupt to notice another processor, and it is allowed to
+ send data to itself.
+
endif
diff --git a/drivers/mailbox/Makefile b/drivers/mailbox/Makefile
index 5cf2f54de..71f0f746e 100644
--- a/drivers/mailbox/Makefile
+++ b/drivers/mailbox/Makefile
@@ -62,3 +62,5 @@ obj-$(CONFIG_SUN6I_MSGBOX) += sun6i-msgbox.o
obj-$(CONFIG_SPRD_MBOX) += sprd-mailbox.o

obj-$(CONFIG_QCOM_IPCC) += qcom-ipcc.o
+
+obj-$(CONFIG_CV1800B_MBOX) += cv1800b-mailbox.o
\ No newline at end of file
diff --git a/drivers/mailbox/cv1800b-mailbox.c b/drivers/mailbox/cv1800b-mailbox.c
new file mode 100644
index 000000000..8ef2a5492
--- /dev/null
+++ b/drivers/mailbox/cv1800b-mailbox.c
@@ -0,0 +1,181 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/kfifo.h>
+#include <linux/mailbox_controller.h>
+#include <linux/mailbox_client.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define MAILBOX_MAX_CHAN 0x0008
+#define MAILBOX_DONE_OFFSET 0x0002
+#define MAILBOX_CONTEXT_SIZE 0x0040
+#define MAILBOX_CONTEXT_OFFSET 0x0400
+
+#define MBOX_EN_REG(cpu) (cpu << 2)
+#define MBOX_DONE_REG(cpu) ((cpu << 2) + MAILBOX_DONE_OFFSET)
+
+#define MBOX_SET_CLR_REG(cpu) (0x10 + (cpu << 4))
+#define MBOX_SET_INT_REG(cpu) (0x18 + (cpu << 4))
+
+#define MBOX_SET_REG 0x60
+
+struct cv1800b_mbox {
+ struct mbox_controller mbox;
+ struct mbox_chan chans[MAILBOX_MAX_CHAN];
+ u64 *content[MAILBOX_MAX_CHAN];
+ void __iomem *mbox_base;
+ int sendto;
+ int recvid;
+};
+
+static irqreturn_t cv1800b_mbox_isr(int irq, void *dev_id)
+{
+ struct cv1800b_mbox *mbox = (struct cv1800b_mbox *)dev_id;
+ size_t i;
+
+ for (i = 0; i < MAILBOX_MAX_CHAN; i++) {
+ if (mbox->content[i]) {
+ mbox_chan_received_data(&mbox->chans[i],
+ mbox->content[i]);
+ mbox->content[i] = NULL;
+ return IRQ_HANDLED;
+ }
+ }
+ return IRQ_NONE;
+}
+
+static irqreturn_t cv1800b_mbox_irq(int irq, void *dev_id)
+{
+ struct cv1800b_mbox *mbox = (struct cv1800b_mbox *)dev_id;
+ u8 set, valid;
+ u64 *addr;
+ size_t i;
+
+ set = readb(mbox->mbox_base + MBOX_SET_INT_REG(mbox->recvid));
+
+ if (!set)
+ return IRQ_NONE;
+
+ for (i = 0; i < MAILBOX_MAX_CHAN; i++) {
+ valid = set & (1 << i);
+ addr = (u64 *)(mbox->mbox_base + MAILBOX_CONTEXT_OFFSET) + i;
+ if (valid) {
+ mbox->content[i] = addr;
+ writeb(valid, mbox->mbox_base +
+ MBOX_SET_CLR_REG(mbox->recvid));
+ writeb(~valid,
+ mbox->mbox_base + MBOX_EN_REG(mbox->recvid));
+ return IRQ_WAKE_THREAD;
+ }
+ }
+
+ return IRQ_NONE;
+}
+
+static int cv1800b_mbox_send_data(struct mbox_chan *chan, void *data)
+{
+ struct cv1800b_mbox *mbox = dev_get_drvdata(chan->mbox->dev);
+ int idx = (int)chan->con_priv;
+ u8 en, valid;
+ u64 *addr = (u64 *)(mbox->mbox_base + MAILBOX_CONTEXT_OFFSET) + idx;
+
+ memcpy_toio(addr, data, 8);
+
+ valid = 1 << idx;
+ writeb(valid, mbox->mbox_base + MBOX_SET_CLR_REG(mbox->sendto));
+ en = readb(mbox->mbox_base + MBOX_EN_REG(mbox->sendto));
+ writeb(en | valid, mbox->mbox_base + MBOX_EN_REG(mbox->sendto));
+ writeb(valid, mbox->mbox_base + MBOX_SET_REG);
+
+ return 0;
+}
+
+static bool cv1800b_last_tx_done(struct mbox_chan *chan)
+{
+ return true;
+}
+
+static const struct mbox_chan_ops cv1800b_mbox_chan_ops = {
+ .send_data = cv1800b_mbox_send_data,
+ .last_tx_done = cv1800b_last_tx_done,
+};
+
+static const struct of_device_id cv1800b_mbox_of_match[] = {
+ { .compatible = "sophgo,cv1800b-mailbox", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, cv1800b_mbox_of_match);
+
+static int cv1800b_mbox_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct cv1800b_mbox *mb;
+ int irq, idx, err, cpu;
+
+ if (!dev->of_node)
+ return -ENODEV;
+
+ mb = devm_kzalloc(dev, sizeof(*mb), GFP_KERNEL);
+ if (!mb)
+ return -ENOMEM;
+
+ mb->mbox_base = devm_of_iomap(dev, dev->of_node, 0, NULL);
+ if (IS_ERR(mb->mbox_base))
+ return dev_err_probe(dev, PTR_ERR(mb->mbox_base),
+ "Failed to map resource\n");
+
+ err = of_property_read_s32(dev->of_node, "sendto", &cpu);
+ if (err)
+ return dev_err_probe(dev, err,
+ "Failed to find <sendto> in of_node\n");
+
+ mb->sendto = cpu;
+
+ err = of_property_read_s32(dev->of_node, "recvid", &cpu);
+ if (err) {
+ return dev_err_probe(dev, err,
+ "Failed to find <recvid> in of_node\n");
+ }
+ mb->recvid = cpu;
+
+ mb->mbox.dev = dev;
+ mb->mbox.num_chans = MAILBOX_MAX_CHAN;
+ mb->mbox.chans = mb->chans;
+ mb->mbox.ops = &cv1800b_mbox_chan_ops;
+ mb->mbox.txdone_poll = true;
+
+ irq = platform_get_irq_byname(pdev, "mailbox");
+ err = devm_request_threaded_irq(dev, irq, cv1800b_mbox_irq,
+ cv1800b_mbox_isr, IRQF_ONESHOT,
+ dev_name(&pdev->dev), mb);
+ if (err < 0)
+ return dev_err_probe(dev, err, "Failed to register irq\n");
+
+ for (idx = 0; idx < MAILBOX_MAX_CHAN; idx++)
+ mb->mbox.chans[idx].con_priv = (void *)idx;
+
+ err = devm_mbox_controller_register(dev, &mb->mbox);
+ if (err)
+ return dev_err_probe(dev, err, "Failed to register mailbox\n");
+
+ platform_set_drvdata(pdev, mb);
+ return 0;
+}
+
+static struct platform_driver cv1800b_mbox_driver = {
+ .driver = {
+ .name = "cv1800b-mbox",
+ .of_match_table = cv1800b_mbox_of_match,
+ },
+ .probe = cv1800b_mbox_probe,
+};
+
+module_platform_driver(cv1800b_mbox_driver);
+
+MODULE_DESCRIPTION("cv1800b mailbox driver");
+MODULE_LICENSE("GPL");
--
2.17.1