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/*
* Copyright (c) 2006-2024, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2024-5-1 GuEe-GUI first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#include <drivers/clk.h>
#define DBG_TAG "mailbox.spacemit"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#define SPACEMIT_NUM_CHANNELS 4
#define SPACEMIT_TX_ACK_OFFSET 4
#define MBOX_REG_IPC_DW 0x00
#define MBOX_REG_IPC_WDR 0x04
#define MBOX_REG_ISRW 0x08
#define MBOX_REG_ICR 0x0C
#define MBOX_REG_IIR 0x10
#define MBOX_REG_RDR 0x14
struct spacemit_mailbox
{
struct rt_mbox_controller parent;
int irq;
void *regs;
rt_bool_t clk_enabled;
struct rt_clk *clk;
struct rt_reset_control *rstc;
};
#define raw_to_spacemit_mailbox(raw) rt_container_of(raw, struct spacemit_mailbox, parent)
static rt_err_t spacemit_mailbox_request(struct rt_mbox_chan *chan)
{
return RT_EOK;
}
static void spacemit_mailbox_release(struct rt_mbox_chan *chan)
{
struct spacemit_mailbox *sp_mbox = raw_to_spacemit_mailbox(chan->ctrl);
HWREG32(sp_mbox->regs + MBOX_REG_ICR) =
RT_BIT(chan - sp_mbox->parent.chans);
}
static rt_err_t spacemit_mailbox_send(struct rt_mbox_chan *chan, const void *data)
{
struct spacemit_mailbox *sp_mbox = raw_to_spacemit_mailbox(chan->ctrl);
HWREG32(sp_mbox->regs + MBOX_REG_ISRW) =
RT_BIT(chan - sp_mbox->parent.chans);
return RT_EOK;
}
static rt_bool_t spacemit_mailbox_peek(struct rt_mbox_chan *chan)
{
struct spacemit_mailbox *sp_mbox = raw_to_spacemit_mailbox(chan->ctrl);
return !!(HWREG32(sp_mbox->regs + MBOX_REG_RDR) &
RT_BIT(chan - sp_mbox->parent.chans));
}
static const struct rt_mbox_controller_ops spacemit_mailbox_ops =
{
.request = spacemit_mailbox_request,
.release = spacemit_mailbox_release,
.send = spacemit_mailbox_send,
.peek = spacemit_mailbox_peek,
};
static void spacemit_mailbox_isr(int irqno, void *param)
{
rt_uint32_t status, msg = 0;
struct rt_mbox_chan *chan;
struct spacemit_mailbox *sp_mbox = param;
HWREG32(sp_mbox->regs + MBOX_REG_IIR) = 0;
status = HWREG32(sp_mbox->regs + MBOX_REG_IIR);
if (!(status & 0xff))
{
return;
}
for (int i = SPACEMIT_TX_ACK_OFFSET; i < SPACEMIT_NUM_CHANNELS + SPACEMIT_TX_ACK_OFFSET; ++i)
{
chan = &sp_mbox->parent.chans[i - SPACEMIT_TX_ACK_OFFSET];
if (!(status & RT_BIT(i)))
{
continue;
}
/* Clear the irq pending */
HWREG32(sp_mbox->regs + MBOX_REG_ICR) = 1 << i;
rt_mbox_send_done(chan, 0);
}
for (int i = 0; i < SPACEMIT_NUM_CHANNELS; ++i)
{
chan = &sp_mbox->parent.chans[i];
if (!(status & RT_BIT(i)))
{
continue;
}
rt_mbox_recv(chan, &msg);
/* Clear the irq pending */
HWREG32(sp_mbox->regs + MBOX_REG_ICR) = RT_BIT(i);
/* Then send an ack */
HWREG32(sp_mbox->regs + MBOX_REG_ISRW) = RT_BIT(i + SPACEMIT_TX_ACK_OFFSET);
}
}
static void spacemit_mailbox_free_resource(struct spacemit_mailbox *sp_mbox)
{
if (sp_mbox->regs)
{
rt_iounmap(sp_mbox->regs);
}
if (!rt_is_err_or_null(sp_mbox->clk))
{
if (sp_mbox->clk_enabled)
{
rt_clk_disable_unprepare(sp_mbox->clk);
}
rt_clk_put(sp_mbox->clk);
}
if (!rt_is_err_or_null(sp_mbox->rstc))
{
rt_reset_control_put(sp_mbox->rstc);
}
rt_free(sp_mbox);
}
static rt_err_t spacemit_mailbox_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
struct rt_device *dev = &pdev->parent;
struct spacemit_mailbox *sp_mbox = rt_calloc(1, sizeof(*sp_mbox));
if (!sp_mbox)
{
return -RT_ENOMEM;
}
sp_mbox->regs = rt_dm_dev_iomap(dev, 0);
if (!sp_mbox->regs)
{
err = -RT_EIO;
goto _fail;
}
sp_mbox->clk = rt_clk_get_by_name(dev, "core");
if (rt_is_err(sp_mbox->clk))
{
err = rt_ptr_err(sp_mbox->clk);
goto _fail;
}
if ((err = rt_clk_prepare_enable(sp_mbox->clk)))
{
goto _fail;
}
sp_mbox->clk_enabled = RT_TRUE;
sp_mbox->rstc = rt_reset_control_get_by_name(dev, "core_reset");
if (rt_is_err(sp_mbox->rstc))
{
err = rt_ptr_err(sp_mbox->rstc);
goto _fail;
}
if ((err = rt_reset_control_deassert(sp_mbox->rstc)))
{
goto _fail;
}
sp_mbox->irq = rt_dm_dev_get_irq(dev, 0);
if (sp_mbox->irq < 0)
{
err = sp_mbox->irq;
goto _fail;
}
rt_hw_interrupt_install(sp_mbox->irq, spacemit_mailbox_isr, sp_mbox, "sp_mbox");
rt_hw_interrupt_umask(sp_mbox->irq);
dev->user_data = sp_mbox;
sp_mbox->parent.dev = dev;
sp_mbox->parent.num_chans = SPACEMIT_NUM_CHANNELS;
sp_mbox->parent.ops = &spacemit_mailbox_ops;
if ((err = rt_mbox_controller_register(&sp_mbox->parent)))
{
goto _free_irq;
}
return RT_EOK;
_free_irq:
rt_hw_interrupt_mask(sp_mbox->irq);
rt_pic_detach_irq(sp_mbox->irq, sp_mbox);
_fail:
spacemit_mailbox_free_resource(sp_mbox);
return err;
}
static rt_err_t spacemit_mailbox_remove(struct rt_platform_device *pdev)
{
struct spacemit_mailbox *sp_mbox = pdev->parent.user_data;
rt_hw_interrupt_mask(sp_mbox->irq);
rt_pic_detach_irq(sp_mbox->irq, sp_mbox);
rt_mbox_controller_unregister(&sp_mbox->parent);
spacemit_mailbox_free_resource(sp_mbox);
return RT_EOK;
}
static const struct rt_ofw_node_id spacemit_mailbox_ofw_ids[] =
{
{ .compatible = "spacemit,k1-x-mailbox", },
{ /* sentinel */ }
};
static struct rt_platform_driver spacemit_mailbox_driver =
{
.name = "mailbox-spacemit",
.ids = spacemit_mailbox_ofw_ids,
.probe = spacemit_mailbox_probe,
.remove = spacemit_mailbox_remove,
};
static int spacemit_mailbox_drv_register(void)
{
rt_platform_driver_register(&spacemit_mailbox_driver);
return 0;
}
INIT_SUBSYS_EXPORT(spacemit_mailbox_drv_register);
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