blob: 38184e27aa4fe9158f35adf24f2d349f925dcb4c [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (C) 2019
* Lukasz Majewski, DENX Software Engineering, lukma@denx.de
*
* Common Clock Framework [CCF] driver for Sandbox
*/
#include <common.h>
#include <dm.h>
#include <clk.h>
#include <malloc.h>
#include <asm/clk.h>
#include <clk-uclass.h>
#include <dm/devres.h>
#include <linux/bitops.h>
#include <linux/clk-provider.h>
#include <sandbox-clk.h>
#include <linux/err.h>
/*
* Sandbox implementation of CCF primitives necessary for clk-uclass testing
*
* --- Sandbox PLLv3 ---
*/
struct clk_pllv3 {
struct clk clk;
u32 div_mask;
u32 div_shift;
};
int sandbox_clk_enable_count(struct clk *clk)
{
struct clk *clkp = NULL;
int ret;
ret = clk_get_by_id(clk->id, &clkp);
if (ret)
return 0;
return clkp->enable_count;
}
static ulong clk_pllv3_get_rate(struct clk *clk)
{
unsigned long parent_rate = clk_get_parent_rate(clk);
return parent_rate * 24;
}
static const struct clk_ops clk_pllv3_generic_ops = {
.get_rate = clk_pllv3_get_rate,
};
struct clk *sandbox_clk_pllv3(enum sandbox_pllv3_type type, const char *name,
const char *parent_name, void __iomem *base,
u32 div_mask)
{
struct clk_pllv3 *pll;
struct clk *clk;
char *drv_name = "sandbox_clk_pllv3";
int ret;
pll = kzalloc(sizeof(*pll), GFP_KERNEL);
if (!pll)
return ERR_PTR(-ENOMEM);
pll->div_mask = div_mask;
clk = &pll->clk;
ret = clk_register(clk, drv_name, name, parent_name);
if (ret) {
kfree(pll);
return ERR_PTR(ret);
}
return clk;
}
U_BOOT_DRIVER(sandbox_clk_pll_generic) = {
.name = "sandbox_clk_pllv3",
.id = UCLASS_CLK,
.ops = &clk_pllv3_generic_ops,
};
/* --- Sandbox PLLv3 --- */
/* --- Sandbox Gate --- */
struct clk_gate2 {
struct clk clk;
bool state;
};
#define to_clk_gate2(_clk) container_of(_clk, struct clk_gate2, clk)
static int clk_gate2_enable(struct clk *clk)
{
struct clk_gate2 *gate = to_clk_gate2(dev_get_clk_ptr(clk->dev));
gate->state = 1;
return 0;
}
static int clk_gate2_disable(struct clk *clk)
{
struct clk_gate2 *gate = to_clk_gate2(dev_get_clk_ptr(clk->dev));
gate->state = 0;
return 0;
}
static const struct clk_ops clk_gate2_ops = {
.enable = clk_gate2_enable,
.disable = clk_gate2_disable,
.get_rate = clk_generic_get_rate,
};
struct clk *sandbox_clk_register_gate2(struct device *dev, const char *name,
const char *parent_name,
unsigned long flags, void __iomem *reg,
u8 bit_idx, u8 cgr_val,
u8 clk_gate2_flags)
{
struct clk_gate2 *gate;
struct clk *clk;
int ret;
gate = kzalloc(sizeof(*gate), GFP_KERNEL);
if (!gate)
return ERR_PTR(-ENOMEM);
gate->state = 0;
clk = &gate->clk;
clk->flags = flags;
ret = clk_register(clk, "sandbox_clk_gate2", name, parent_name);
if (ret) {
kfree(gate);
return ERR_PTR(ret);
}
return clk;
}
U_BOOT_DRIVER(sandbox_clk_gate2) = {
.name = "sandbox_clk_gate2",
.id = UCLASS_CLK,
.ops = &clk_gate2_ops,
};
static unsigned long sandbox_clk_composite_divider_recalc_rate(struct clk *clk)
{
struct clk_divider *divider = (struct clk_divider *)to_clk_divider(clk);
struct clk_composite *composite = (struct clk_composite *)clk->data;
ulong parent_rate = clk_get_parent_rate(&composite->clk);
unsigned int val;
val = divider->io_divider_val;
val >>= divider->shift;
val &= clk_div_mask(divider->width);
return divider_recalc_rate(clk, parent_rate, val, divider->table,
divider->flags, divider->width);
}
static const struct clk_ops sandbox_clk_composite_divider_ops = {
.get_rate = sandbox_clk_composite_divider_recalc_rate,
};
struct clk *sandbox_clk_composite(const char *name,
const char * const *parent_names,
int num_parents, void __iomem *reg,
unsigned long flags)
{
struct clk *clk = ERR_PTR(-ENOMEM);
struct clk_divider *div = NULL;
struct clk_gate *gate = NULL;
struct clk_mux *mux = NULL;
mux = kzalloc(sizeof(*mux), GFP_KERNEL);
if (!mux)
goto fail;
mux->reg = reg;
mux->shift = 24;
mux->mask = 0x7;
mux->num_parents = num_parents;
mux->flags = flags;
mux->parent_names = parent_names;
div = kzalloc(sizeof(*div), GFP_KERNEL);
if (!div)
goto fail;
div->reg = reg;
div->shift = 16;
div->width = 3;
div->flags = CLK_DIVIDER_ROUND_CLOSEST | flags;
gate = kzalloc(sizeof(*gate), GFP_KERNEL);
if (!gate)
goto fail;
gate->reg = reg;
gate->bit_idx = 28;
gate->flags = flags;
clk = clk_register_composite(NULL, name,
parent_names, num_parents,
&mux->clk, &clk_mux_ops, &div->clk,
&sandbox_clk_composite_divider_ops,
&gate->clk, &clk_gate_ops, flags);
if (IS_ERR(clk))
goto fail;
return clk;
fail:
kfree(gate);
kfree(div);
kfree(mux);
return ERR_CAST(clk);
}
/* --- Sandbox Gate --- */
/* The CCF core driver itself */
static const struct udevice_id sandbox_clk_ccf_test_ids[] = {
{ .compatible = "sandbox,clk-ccf" },
{ }
};
static const char *const usdhc_sels[] = { "pll3_60m", "pll3_80m", };
static const char *const i2c_sels[] = { "pll3_60m", "pll3_80m", };
static int sandbox_clk_ccf_probe(struct udevice *dev)
{
void *base = NULL;
u32 reg;
clk_dm(SANDBOX_CLK_PLL3,
sandbox_clk_pllv3(SANDBOX_PLLV3_USB, "pll3_usb_otg", "osc",
base + 0x10, 0x3));
clk_dm(SANDBOX_CLK_PLL3_60M,
sandbox_clk_fixed_factor("pll3_60m", "pll3_usb_otg", 1, 8));
clk_dm(SANDBOX_CLK_PLL3_80M,
sandbox_clk_fixed_factor("pll3_80m", "pll3_usb_otg", 1, 6));
/* The HW adds +1 to the divider value (2+1) is the divider */
reg = (2 << 19);
clk_dm(SANDBOX_CLK_ECSPI_ROOT,
sandbox_clk_divider("ecspi_root", "pll3_60m", &reg, 19, 6));
reg = 0;
clk_dm(SANDBOX_CLK_ECSPI0,
sandbox_clk_gate("ecspi0", "ecspi_root", &reg, 0, 0));
clk_dm(SANDBOX_CLK_ECSPI1,
sandbox_clk_gate2("ecspi1", "ecspi_root", base + 0x6c, 0));
/* Select 'pll3_60m' */
reg = 0;
clk_dm(SANDBOX_CLK_USDHC1_SEL,
sandbox_clk_mux("usdhc1_sel", &reg, 16, 1, usdhc_sels,
ARRAY_SIZE(usdhc_sels)));
/* Select 'pll3_80m' */
reg = BIT(17);
clk_dm(SANDBOX_CLK_USDHC2_SEL,
sandbox_clk_mux("usdhc2_sel", &reg, 17, 1, usdhc_sels,
ARRAY_SIZE(usdhc_sels)));
reg = BIT(28) | BIT(24) | BIT(16);
clk_dm(SANDBOX_CLK_I2C,
sandbox_clk_composite("i2c", i2c_sels, ARRAY_SIZE(i2c_sels),
&reg, CLK_SET_RATE_UNGATE));
clk_dm(SANDBOX_CLK_I2C_ROOT,
sandbox_clk_gate2("i2c_root", "i2c", base + 0x7c, 0));
return 0;
}
U_BOOT_DRIVER(sandbox_clk_ccf) = {
.name = "sandbox_clk_ccf",
.id = UCLASS_CLK,
.ops = &ccf_clk_ops,
.probe = sandbox_clk_ccf_probe,
.of_match = sandbox_clk_ccf_test_ids,
};