u-boot/drivers/clk/exynos/clk-exynos7420.c
Bin Meng e25080664a clk: Remove DM_FLAG_PRE_RELOC flag in various drivers
When a driver declares DM_FLAG_PRE_RELOC flag, it wishes to be
bound before relocation. However due to a bug in the DM core,
the flag only takes effect when devices are statically declared
via U_BOOT_DEVICE(). This bug has been fixed recently by commit
"dm: core: Respect drivers with the DM_FLAG_PRE_RELOC flag in
lists_bind_fdt()", but with the fix, it has a side effect that
all existing drivers that declared DM_FLAG_PRE_RELOC flag will
be bound before relocation now. This may expose potential boot
failure on some boards due to insufficient memory during the
pre-relocation stage.

To mitigate this potential impact, the following changes are
implemented:

- Remove DM_FLAG_PRE_RELOC flag in the driver, if the driver
  only supports configuration from device tree (OF_CONTROL)
- Keep DM_FLAG_PRE_RELOC flag in the driver only if the device
  is statically declared via U_BOOT_DEVICE()
- Surround DM_FLAG_PRE_RELOC flag with OF_CONTROL check, for
  drivers that support both statically declared devices and
  configuration from device tree

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
2018-11-14 09:16:28 -08:00

230 lines
5.5 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* Samsung Exynos7420 clock driver.
* Copyright (C) 2016 Samsung Electronics
* Thomas Abraham <thomas.ab@samsung.com>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <clk-uclass.h>
#include <asm/io.h>
#include <dt-bindings/clock/exynos7420-clk.h>
#include "clk-pll.h"
#define DIVIDER(reg, shift, mask) \
(((readl(reg) >> shift) & mask) + 1)
/* CMU TOPC block device structure */
struct exynos7420_clk_cmu_topc {
unsigned int rsvd1[68];
unsigned int bus0_pll_con[2];
unsigned int rsvd2[2];
unsigned int bus1_pll_con[2];
unsigned int rsvd3[54];
unsigned int mux_sel[6];
unsigned int rsvd4[250];
unsigned int div[4];
};
/* CMU TOP0 block device structure */
struct exynos7420_clk_cmu_top0 {
unsigned int rsvd0[128];
unsigned int mux_sel[7];
unsigned int rsvd1[261];
unsigned int div_peric[5];
};
/**
* struct exynos7420_clk_topc_priv - private data for CMU topc clock driver.
*
* @topc: base address of the memory mapped CMU TOPC controller.
* @fin_freq: frequency of the Oscillator clock.
* @sclk_bus0_pll_a: frequency of sclk_bus0_pll_a clock.
* @sclk_bus1_pll_a: frequency of sclk_bus1_pll_a clock.
*/
struct exynos7420_clk_topc_priv {
struct exynos7420_clk_cmu_topc *topc;
unsigned long fin_freq;
unsigned long sclk_bus0_pll_a;
unsigned long sclk_bus1_pll_a;
};
/**
* struct exynos7420_clk_top0_priv - private data for CMU top0 clock driver.
*
* @top0: base address of the memory mapped CMU TOP0 controller.
* @mout_top0_bus0_pll_half: frequency of mout_top0_bus0_pll_half clock
* @sclk_uart2: frequency of sclk_uart2 clock.
*/
struct exynos7420_clk_top0_priv {
struct exynos7420_clk_cmu_top0 *top0;
unsigned long mout_top0_bus0_pll_half;
unsigned long sclk_uart2;
};
static ulong exynos7420_topc_get_rate(struct clk *clk)
{
struct exynos7420_clk_topc_priv *priv = dev_get_priv(clk->dev);
switch (clk->id) {
case DOUT_SCLK_BUS0_PLL:
case SCLK_BUS0_PLL_A:
case SCLK_BUS0_PLL_B:
return priv->sclk_bus0_pll_a;
case DOUT_SCLK_BUS1_PLL:
case SCLK_BUS1_PLL_A:
case SCLK_BUS1_PLL_B:
return priv->sclk_bus1_pll_a;
default:
return 0;
}
}
static struct clk_ops exynos7420_clk_topc_ops = {
.get_rate = exynos7420_topc_get_rate,
};
static int exynos7420_clk_topc_probe(struct udevice *dev)
{
struct exynos7420_clk_topc_priv *priv = dev_get_priv(dev);
struct exynos7420_clk_cmu_topc *topc;
struct clk in_clk;
unsigned long rate;
fdt_addr_t base;
int ret;
base = devfdt_get_addr(dev);
if (base == FDT_ADDR_T_NONE)
return -EINVAL;
topc = (struct exynos7420_clk_cmu_topc *)base;
priv->topc = topc;
ret = clk_get_by_index(dev, 0, &in_clk);
if (ret >= 0)
priv->fin_freq = clk_get_rate(&in_clk);
rate = pll145x_get_rate(&topc->bus0_pll_con[0], priv->fin_freq);
if (readl(&topc->mux_sel[1]) & (1 << 16))
rate >>= 1;
rate /= DIVIDER(&topc->div[3], 0, 0xf);
priv->sclk_bus0_pll_a = rate;
rate = pll145x_get_rate(&topc->bus1_pll_con[0], priv->fin_freq) /
DIVIDER(&topc->div[3], 8, 0xf);
priv->sclk_bus1_pll_a = rate;
return 0;
}
static ulong exynos7420_top0_get_rate(struct clk *clk)
{
struct exynos7420_clk_top0_priv *priv = dev_get_priv(clk->dev);
struct exynos7420_clk_cmu_top0 *top0 = priv->top0;
switch (clk->id) {
case CLK_SCLK_UART2:
return priv->mout_top0_bus0_pll_half /
DIVIDER(&top0->div_peric[3], 8, 0xf);
default:
return 0;
}
}
static struct clk_ops exynos7420_clk_top0_ops = {
.get_rate = exynos7420_top0_get_rate,
};
static int exynos7420_clk_top0_probe(struct udevice *dev)
{
struct exynos7420_clk_top0_priv *priv;
struct exynos7420_clk_cmu_top0 *top0;
struct clk in_clk;
fdt_addr_t base;
int ret;
priv = dev_get_priv(dev);
if (!priv)
return -EINVAL;
base = devfdt_get_addr(dev);
if (base == FDT_ADDR_T_NONE)
return -EINVAL;
top0 = (struct exynos7420_clk_cmu_top0 *)base;
priv->top0 = top0;
ret = clk_get_by_index(dev, 1, &in_clk);
if (ret >= 0) {
priv->mout_top0_bus0_pll_half =
clk_get_rate(&in_clk);
if (readl(&top0->mux_sel[1]) & (1 << 16))
priv->mout_top0_bus0_pll_half >>= 1;
}
return 0;
}
static ulong exynos7420_peric1_get_rate(struct clk *clk)
{
struct clk in_clk;
unsigned int ret;
unsigned long freq = 0;
switch (clk->id) {
case SCLK_UART2:
ret = clk_get_by_index(clk->dev, 3, &in_clk);
if (ret < 0)
return ret;
freq = clk_get_rate(&in_clk);
break;
}
return freq;
}
static struct clk_ops exynos7420_clk_peric1_ops = {
.get_rate = exynos7420_peric1_get_rate,
};
static const struct udevice_id exynos7420_clk_topc_compat[] = {
{ .compatible = "samsung,exynos7-clock-topc" },
{ }
};
U_BOOT_DRIVER(exynos7420_clk_topc) = {
.name = "exynos7420-clock-topc",
.id = UCLASS_CLK,
.of_match = exynos7420_clk_topc_compat,
.probe = exynos7420_clk_topc_probe,
.priv_auto_alloc_size = sizeof(struct exynos7420_clk_topc_priv),
.ops = &exynos7420_clk_topc_ops,
};
static const struct udevice_id exynos7420_clk_top0_compat[] = {
{ .compatible = "samsung,exynos7-clock-top0" },
{ }
};
U_BOOT_DRIVER(exynos7420_clk_top0) = {
.name = "exynos7420-clock-top0",
.id = UCLASS_CLK,
.of_match = exynos7420_clk_top0_compat,
.probe = exynos7420_clk_top0_probe,
.priv_auto_alloc_size = sizeof(struct exynos7420_clk_top0_priv),
.ops = &exynos7420_clk_top0_ops,
};
static const struct udevice_id exynos7420_clk_peric1_compat[] = {
{ .compatible = "samsung,exynos7-clock-peric1" },
{ }
};
U_BOOT_DRIVER(exynos7420_clk_peric1) = {
.name = "exynos7420-clock-peric1",
.id = UCLASS_CLK,
.of_match = exynos7420_clk_peric1_compat,
.ops = &exynos7420_clk_peric1_ops,
};