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// SPDX-License-Identifier: GPL-2.0+
/*
* TI clock utilities
*
* Copyright (C) 2020 Dario Binacchi <dariobin@libero.it>
*/
#include <dm.h>
#include <fdtdec.h>
#include <regmap.h>
#include <asm/io.h>
#include <dm/device_compat.h>
#include "clk.h"
#define CLK_MAX_MEMMAPS 10
struct clk_iomap {
struct regmap *regmap;
ofnode node;
};
static unsigned int clk_memmaps_num;
static struct clk_iomap clk_memmaps[CLK_MAX_MEMMAPS];
static void clk_ti_rmw(u32 val, u32 mask, struct clk_ti_reg *reg)
{
u32 v;
v = clk_ti_readl(reg);
v &= ~mask;
v |= val;
clk_ti_writel(v, reg);
}
void clk_ti_latch(struct clk_ti_reg *reg, s8 shift)
{
u32 latch;
if (shift < 0)
return;
latch = 1 << shift;
clk_ti_rmw(latch, latch, reg);
clk_ti_rmw(0, latch, reg);
clk_ti_readl(reg); /* OCP barrier */
}
void clk_ti_writel(u32 val, struct clk_ti_reg *reg)
{
struct clk_iomap *io = &clk_memmaps[reg->index];
regmap_write(io->regmap, reg->offset, val);
}
u32 clk_ti_readl(struct clk_ti_reg *reg)
{
struct clk_iomap *io = &clk_memmaps[reg->index];
u32 val;
regmap_read(io->regmap, reg->offset, &val);
return val;
}
static ofnode clk_ti_get_regmap_node(struct udevice *dev)
{
ofnode node = dev_ofnode(dev), parent;
if (!ofnode_valid(node))
return ofnode_null();
parent = ofnode_get_parent(node);
if (strcmp(ofnode_get_name(parent), "clocks"))
return ofnode_null();
return ofnode_get_parent(parent);
}
int clk_ti_get_reg_addr(struct udevice *dev, int index, struct clk_ti_reg *reg)
{
ofnode node;
int i, ret;
u32 val;
ret = ofnode_read_u32_index(dev_ofnode(dev), "reg", index, &val);
if (ret) {
dev_err(dev, "%s must have reg[%d]\n", ofnode_get_name(node),
index);
return ret;
}
/* parent = ofnode_get_parent(parent); */
node = clk_ti_get_regmap_node(dev);
if (!ofnode_valid(node)) {
dev_err(dev, "failed to get regmap node\n");
return -EFAULT;
}
for (i = 0; i < clk_memmaps_num; i++) {
if (ofnode_equal(clk_memmaps[i].node, node))
break;
}
if (i == clk_memmaps_num) {
if (i == CLK_MAX_MEMMAPS)
return -ENOMEM;
ret = regmap_init_mem(node, &clk_memmaps[i].regmap);
if (ret)
return ret;
clk_memmaps[i].node = node;
clk_memmaps_num++;
}
reg->index = i;
reg->offset = val;
return 0;
}
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