mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-24 13:43:28 +00:00
61143f741e
Fix diacritics in some instances of my name and change my e-mail address to kabel@kernel.org. Add corresponding .mailmap entries. Signed-off-by: Marek Behún <kabel@kernel.org> Reviewed-by: Stefan Roese <sr@denx.de>
156 lines
3.2 KiB
C
156 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Marvell Armada 37xx SoC Time Base Generator clocks
|
|
*
|
|
* Marek Behún <kabel@kernel.org>
|
|
*
|
|
* Based on Linux driver by:
|
|
* Gregory CLEMENT <gregory.clement@free-electrons.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <clk-uclass.h>
|
|
#include <clk.h>
|
|
#include <dm.h>
|
|
#include <asm/io.h>
|
|
#include <asm/arch/cpu.h>
|
|
#include <dm/device_compat.h>
|
|
|
|
#define NUM_TBG 4
|
|
|
|
#define TBG_CTRL0 0x4
|
|
#define TBG_CTRL1 0x8
|
|
#define TBG_CTRL7 0x20
|
|
#define TBG_CTRL8 0x30
|
|
|
|
#define TBG_DIV_MASK 0x1FF
|
|
|
|
#define TBG_A_REFDIV 0
|
|
#define TBG_B_REFDIV 16
|
|
|
|
#define TBG_A_FBDIV 2
|
|
#define TBG_B_FBDIV 18
|
|
|
|
#define TBG_A_VCODIV_SE 0
|
|
#define TBG_B_VCODIV_SE 16
|
|
|
|
#define TBG_A_VCODIV_DIFF 1
|
|
#define TBG_B_VCODIV_DIFF 17
|
|
|
|
struct tbg_def {
|
|
const char *name;
|
|
u32 refdiv_offset;
|
|
u32 fbdiv_offset;
|
|
u32 vcodiv_reg;
|
|
u32 vcodiv_offset;
|
|
};
|
|
|
|
static const struct tbg_def tbg[NUM_TBG] = {
|
|
{"TBG-A-P", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL8, TBG_A_VCODIV_DIFF},
|
|
{"TBG-B-P", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL8, TBG_B_VCODIV_DIFF},
|
|
{"TBG-A-S", TBG_A_REFDIV, TBG_A_FBDIV, TBG_CTRL1, TBG_A_VCODIV_SE},
|
|
{"TBG-B-S", TBG_B_REFDIV, TBG_B_FBDIV, TBG_CTRL1, TBG_B_VCODIV_SE},
|
|
};
|
|
|
|
struct a37xx_tbgclk {
|
|
ulong rates[NUM_TBG];
|
|
unsigned int mult[NUM_TBG];
|
|
unsigned int div[NUM_TBG];
|
|
};
|
|
|
|
static unsigned int tbg_get_mult(void __iomem *reg, const struct tbg_def *ptbg)
|
|
{
|
|
u32 val;
|
|
|
|
val = readl(reg + TBG_CTRL0);
|
|
|
|
return ((val >> ptbg->fbdiv_offset) & TBG_DIV_MASK) << 2;
|
|
}
|
|
|
|
static unsigned int tbg_get_div(void __iomem *reg, const struct tbg_def *ptbg)
|
|
{
|
|
u32 val;
|
|
unsigned int div;
|
|
|
|
val = readl(reg + TBG_CTRL7);
|
|
|
|
div = (val >> ptbg->refdiv_offset) & TBG_DIV_MASK;
|
|
if (div == 0)
|
|
div = 1;
|
|
val = readl(reg + ptbg->vcodiv_reg);
|
|
|
|
div *= 1 << ((val >> ptbg->vcodiv_offset) & TBG_DIV_MASK);
|
|
|
|
return div;
|
|
}
|
|
|
|
static ulong armada_37xx_tbg_clk_get_rate(struct clk *clk)
|
|
{
|
|
struct a37xx_tbgclk *priv = dev_get_priv(clk->dev);
|
|
|
|
if (clk->id >= NUM_TBG)
|
|
return -ENODEV;
|
|
|
|
return priv->rates[clk->id];
|
|
}
|
|
|
|
#if defined(CONFIG_CMD_CLK) && defined(CONFIG_CLK_ARMADA_3720)
|
|
int armada_37xx_tbg_clk_dump(struct udevice *dev)
|
|
{
|
|
struct a37xx_tbgclk *priv = dev_get_priv(dev);
|
|
int i;
|
|
|
|
for (i = 0; i < NUM_TBG; ++i)
|
|
printf(" %s at %lu Hz\n", tbg[i].name,
|
|
priv->rates[i]);
|
|
printf("\n");
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static int armada_37xx_tbg_clk_probe(struct udevice *dev)
|
|
{
|
|
struct a37xx_tbgclk *priv = dev_get_priv(dev);
|
|
void __iomem *reg;
|
|
ulong xtal;
|
|
int i;
|
|
|
|
reg = dev_read_addr_ptr(dev);
|
|
if (!reg) {
|
|
dev_err(dev, "no io address\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
xtal = (ulong)get_ref_clk() * 1000000;
|
|
|
|
for (i = 0; i < NUM_TBG; ++i) {
|
|
unsigned int mult, div;
|
|
|
|
mult = tbg_get_mult(reg, &tbg[i]);
|
|
div = tbg_get_div(reg, &tbg[i]);
|
|
|
|
priv->rates[i] = (xtal * mult) / div;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct clk_ops armada_37xx_tbg_clk_ops = {
|
|
.get_rate = armada_37xx_tbg_clk_get_rate,
|
|
};
|
|
|
|
static const struct udevice_id armada_37xx_tbg_clk_ids[] = {
|
|
{ .compatible = "marvell,armada-3700-tbg-clock" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(armada_37xx_tbg_clk) = {
|
|
.name = "armada_37xx_tbg_clk",
|
|
.id = UCLASS_CLK,
|
|
.of_match = armada_37xx_tbg_clk_ids,
|
|
.ops = &armada_37xx_tbg_clk_ops,
|
|
.priv_auto = sizeof(struct a37xx_tbgclk),
|
|
.probe = armada_37xx_tbg_clk_probe,
|
|
.flags = DM_FLAG_PRE_RELOC,
|
|
};
|