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/*
* Copyright (c) 2006-2022, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2022-11-26 GuEe-GUI first version
*/
#include <rtthread.h>
#include <rtdevice.h>
#define DBG_TAG "clk.bcm2835.aux"
#define DBG_LVL DBG_INFO
#include <rtdbg.h>
#include <dt-bindings/clock/bcm2835-aux.h>
#define BCM2835_AUXIRQ 0x00
#define BCM2835_AUXENB 0x04
struct bcm2835_aux_clk
{
struct rt_clk_node parent;
void *regs;
struct rt_clk *clk;
};
#define raw_to_bcm2835_aux_clk(raw) rt_container_of(raw, struct bcm2835_aux_clk, parent)
struct aux_clk_gate
{
struct rt_clk_cell cell;
rt_uint8_t bit_idx;
};
#define raw_to_aux_clk_gate(raw) rt_container_of(raw, struct aux_clk_gate, cell)
static void bcm2835_aux_clk_endisable(struct rt_clk_cell *cell, int enable)
{
int set = 0 ^ enable;
rt_uint32_t value, bit_idx;
struct aux_clk_gate *gate = raw_to_aux_clk_gate(cell);
struct bcm2835_aux_clk *aux_clk = raw_to_bcm2835_aux_clk(cell->clk_np);
bit_idx = gate->bit_idx;
value = HWREG32(aux_clk->regs);
if (set)
{
value |= RT_BIT(bit_idx);
}
else
{
value &= ~RT_BIT(bit_idx);
}
HWREG32(aux_clk->regs) = value;
}
static rt_err_t bcm2835_aux_clk_enable(struct rt_clk_cell *cell)
{
bcm2835_aux_clk_endisable(cell, 1);
return RT_EOK;
}
static void bcm2835_aux_clk_disable(struct rt_clk_cell *cell)
{
bcm2835_aux_clk_endisable(cell, 0);
}
static rt_bool_t bcm2835_aux_clk_is_enabled(struct rt_clk_cell *cell)
{
rt_uint32_t value, bit_idx;
struct aux_clk_gate *gate = raw_to_aux_clk_gate(cell);
struct bcm2835_aux_clk *aux_clk = raw_to_bcm2835_aux_clk(cell->clk_np);
bit_idx = gate->bit_idx;
value = HWREG32(aux_clk->regs + BCM2835_AUXENB);
value &= RT_BIT(bit_idx);
return !!value;
}
static rt_ubase_t bcm2835_aux_clk_recalc_rate(struct rt_clk_cell *cell, rt_ubase_t parent_rate)
{
struct bcm2835_aux_clk *aux_clk = raw_to_bcm2835_aux_clk(cell->clk_np);
return rt_clk_cell_get_rate(aux_clk->clk->cell);
}
const struct rt_clk_ops bcm2835_aux_clk_ops =
{
.enable = bcm2835_aux_clk_enable,
.disable = bcm2835_aux_clk_disable,
.is_enabled = bcm2835_aux_clk_is_enabled,
.recalc_rate = bcm2835_aux_clk_recalc_rate,
};
static struct aux_clk_gate aux_uart =
{
.cell.name = "aux_uart",
.cell.ops = &bcm2835_aux_clk_ops,
.bit_idx = 0,
};
static struct aux_clk_gate aux_spi1 =
{
.cell.name = "aux_spi1",
.cell.ops = &bcm2835_aux_clk_ops,
.bit_idx = 1,
};
static struct aux_clk_gate aux_spi2 =
{
.cell.name = "aux_spi2",
.cell.ops = &bcm2835_aux_clk_ops,
.bit_idx = 2,
};
static struct rt_clk_cell *bcm2835_aux_clk_cell[] =
{
[BCM2835_AUX_CLOCK_UART] = &aux_uart.cell,
[BCM2835_AUX_CLOCK_SPI1] = &aux_spi1.cell,
[BCM2835_AUX_CLOCK_SPI2] = &aux_spi2.cell,
};
static rt_err_t bcm2835_aux_clk_probe(struct rt_platform_device *pdev)
{
rt_err_t err;
struct rt_device *dev = &pdev->parent;
struct bcm2835_aux_clk *aux_clk = rt_calloc(1, sizeof(*aux_clk));
if (!aux_clk)
{
return -RT_ENOMEM;
}
aux_clk->regs = rt_dm_dev_iomap(dev, 0);
if (!aux_clk->regs)
{
err = -RT_EIO;
goto _fail;
}
aux_clk->clk = rt_clk_get_by_index(dev, 0);
if (rt_is_err(aux_clk->clk))
{
err = rt_ptr_err(aux_clk->clk);
goto _fail;
}
if (aux_clk->clk)
{
for (int i = 0; i < RT_ARRAY_SIZE(bcm2835_aux_clk_cell); ++i)
{
struct rt_clk_cell *cell = bcm2835_aux_clk_cell[i];
if (cell)
{
cell->parents_nr = 1;
cell->parent_name = aux_clk->clk->cell->name;
}
}
}
aux_clk->parent.dev = dev;
aux_clk->parent.cells = bcm2835_aux_clk_cell;
aux_clk->parent.cells_nr = RT_ARRAY_SIZE(bcm2835_aux_clk_cell);
if ((err = rt_clk_register(&aux_clk->parent)))
{
goto _fail;
}
return RT_EOK;
_fail:
if (aux_clk->regs)
{
rt_iounmap(aux_clk->regs);
}
if (!rt_is_err_or_null(aux_clk->clk))
{
rt_clk_put(aux_clk->clk);
}
rt_free(aux_clk);
return err;
}
static const struct rt_ofw_node_id bcm2835_aux_clk_ofw_ids[] =
{
{ .compatible = "brcm,bcm2835-aux", },
{ /* sentinel */ }
};
static struct rt_platform_driver bcm2835_aux_clk_driver =
{
.name = "clk-bcm2835-aux",
.ids = bcm2835_aux_clk_ofw_ids,
.probe = bcm2835_aux_clk_probe,
};
static int bcm2835_aux_clk_register(void)
{
rt_platform_driver_register(&bcm2835_aux_clk_driver);
return 0;
}
INIT_SUBSYS_EXPORT(bcm2835_aux_clk_register);
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