On 2024-07-14 11:36 AM, Yuntao Dai wrote: > Add mailbox controller driver for cv18x SoCs, tested on mailbox-test > client. > > Signed-off-by: Yuntao Dai <d1581209858@xxxxxxxx> > --- > drivers/mailbox/Kconfig | 11 ++ > drivers/mailbox/Makefile | 2 + > drivers/mailbox/cv1800-mailbox.c | 203 +++++++++++++++++++++++++++++++ > 3 files changed, 216 insertions(+) > create mode 100644 drivers/mailbox/cv1800-mailbox.c > > diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig > index 3b8842c4a..db856ec7e 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 CV1800_MBOX > + tristate "cv1800 mailbox" > + depends on OF This dependency is not necessary once the probe function is fixed (see below). > + 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..2c6db8c5c 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_CV1800_MBOX) += cv1800-mailbox.o > \ No newline at end of file Please add the missing newline. > diff --git a/drivers/mailbox/cv1800-mailbox.c b/drivers/mailbox/cv1800-mailbox.c > new file mode 100644 > index 000000000..a3b214b4d > --- /dev/null > +++ b/drivers/mailbox/cv1800-mailbox.c > @@ -0,0 +1,203 @@ > +// 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 RECV_CPU 2 > + > +#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 > + > +/** > + * cv1800 mailbox channel private data > + * @idx: index of channel > + * @cpu: send to which processor > + */ > +struct cv1800_mbox_chan_priv { > + int idx; > + int cpu; > +}; > + > +struct cv1800_mbox { > + struct mbox_controller mbox; > + struct cv1800_mbox_chan_priv priv[MAILBOX_MAX_CHAN]; > + struct mbox_chan chans[MAILBOX_MAX_CHAN]; > + u64 __iomem *content[MAILBOX_MAX_CHAN]; > + void __iomem *mbox_base; > + int recvid; > +}; > + > +static irqreturn_t cv1800_mbox_isr(int irq, void *dev_id) > +{ > + struct cv1800_mbox *mbox = (struct cv1800_mbox *)dev_id; > + size_t i; > + > + for (i = 0; i < MAILBOX_MAX_CHAN; i++) { > + if (mbox->content[i] && mbox->chans[i].cl) { > + mbox_chan_received_data(&mbox->chans[i], > + mbox->content[i]); > + mbox->content[i] = NULL; > + return IRQ_HANDLED; Are you sure you only want to handle one channel per interrupt? Should this be "ret = IRQ_HANDLED;" or similar instead of early return? The same applies to cv1800_mbox_irq(). > + } > + } > + return IRQ_NONE; > +} > + > +static irqreturn_t cv1800_mbox_irq(int irq, void *dev_id) > +{ > + struct cv1800_mbox *mbox = (struct cv1800_mbox *)dev_id; > + u64 __iomem *addr; > + u8 set, valid; > + size_t i; > + > + set = readb(mbox->mbox_base + MBOX_SET_INT_REG(RECV_CPU)); > + > + 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(RECV_CPU)); > + writeb(~valid, mbox->mbox_base + MBOX_EN_REG(RECV_CPU)); > + return IRQ_WAKE_THREAD; > + } > + } > + > + return IRQ_NONE; > +} > + > +static int cv1800_mbox_send_data(struct mbox_chan *chan, void *data) > +{ > + struct cv1800_mbox_chan_priv *priv = > + (struct cv1800_mbox_chan_priv *)chan->con_priv; > + struct cv1800_mbox *mbox = dev_get_drvdata(chan->mbox->dev); > + u64 __iomem *addr; > + u8 en, valid; > + > + int idx = priv->idx; > + int cpu = priv->cpu; > + > + 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(cpu)); > + en = readb(mbox->mbox_base + MBOX_EN_REG(cpu)); > + writeb(en | valid, mbox->mbox_base + MBOX_EN_REG(cpu)); > + writeb(valid, mbox->mbox_base + MBOX_SET_REG); > + > + return 0; > +} > + > +static bool cv1800_last_tx_done(struct mbox_chan *chan) > +{ > + return true; Shouldn't this check MBOX_EN_REG(priv->cpu) or similar to check that the receiver has read the message? > +} > + > +static const struct mbox_chan_ops cv1800_mbox_chan_ops = { > + .send_data = cv1800_mbox_send_data, > + .last_tx_done = cv1800_last_tx_done, > +}; > + > +static struct mbox_chan *cv1800_mbox_xlate(struct mbox_controller *mbox, > + const struct of_phandle_args *spec) > +{ > + struct cv1800_mbox_chan_priv *priv; > + > + int idx = spec->args[0]; > + int cpu = spec->args[1]; > + > + if (idx >= mbox->num_chans) > + return ERR_PTR(-EINVAL); > + > + priv = mbox->chans[idx].con_priv; > + priv->cpu = cpu; > + > + return &mbox->chans[idx]; > +} > + > +static const struct of_device_id cv1800_mbox_of_match[] = { > + { .compatible = "sophgo,cv1800-mailbox", }, > + {}, > +}; > +MODULE_DEVICE_TABLE(of, cv1800_mbox_of_match); > + > +static int cv1800_mbox_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + struct cv1800_mbox *mb; > + int irq, idx, err; > + > + if (!dev->of_node) > + return -ENODEV; No need for this check. > + > + mb = devm_kzalloc(dev, sizeof(*mb), GFP_KERNEL); > + if (!mb) > + return -ENOMEM; > + > + mb->mbox_base = devm_of_iomap(dev, dev->of_node, 0, NULL); Please use devm_platform_ioremap_resource() here, which abstracts away the OF node. > + if (IS_ERR(mb->mbox_base)) > + return dev_err_probe(dev, PTR_ERR(mb->mbox_base), > + "Failed to map resource\n"); > + > + mb->mbox.dev = dev; > + mb->mbox.chans = mb->chans; > + mb->mbox.txdone_poll = true; > + mb->mbox.ops = &cv1800_mbox_chan_ops; > + mb->mbox.num_chans = MAILBOX_MAX_CHAN; > + mb->mbox.of_xlate = cv1800_mbox_xlate; > + > + irq = platform_get_irq_byname(pdev, "mailbox"); > + err = devm_request_threaded_irq(dev, irq, cv1800_mbox_irq, > + cv1800_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->priv[idx].idx = idx; > + mb->mbox.chans[idx].con_priv = &mb->priv[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); cv1800_mbox_send_data() could be called even inside devm_mbox_controller_register(), so this needs to be moved up. > + return 0; > +} > + > +static struct platform_driver cv1800_mbox_driver = { > + .driver = { > + .name = "cv1800-mbox", > + .of_match_table = cv1800_mbox_of_match, > + }, > + .probe = cv1800_mbox_probe, > +}; > + > +module_platform_driver(cv1800_mbox_driver); > + > +MODULE_DESCRIPTION("cv1800 mailbox driver"); > +MODULE_LICENSE("GPL");