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linux-next/drivers/clk/tegra/clk-tegra-super-gen4.c
Sowjanya Komatineni 68a14a5634 clk: tegra: clk-super: Fix to enable PLLP branches to CPU 
This patch has a fix to enable PLLP branches to CPU before changing
the CPU cluster clock source to PLLP for Gen5 Super clock and
disables PLLP branches to CPU when not in use.

During system suspend entry and exit, CPU source will be switched
to PLLP and this needs PLLP branches to be enabled to CPU prior to
the switch.

On system resume, warmboot code enables PLLP branches to CPU and
powers up the CPU with PLLP clock source.

Acked-by: Thierry Reding <treding@nvidia.com>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
2019-11-11 14:53:03 +01:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2012, 2013, NVIDIA CORPORATION. All rights reserved.
*/
#include <linux/io.h>
#include <linux/clk-provider.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/delay.h>
#include <linux/export.h>
#include <linux/clk/tegra.h>
#include "clk.h"
#include "clk-id.h"
#define PLLX_BASE 0xe0
#define PLLX_MISC 0xe4
#define PLLX_MISC2 0x514
#define PLLX_MISC3 0x518
#define CCLKG_BURST_POLICY 0x368
#define CCLKLP_BURST_POLICY 0x370
#define SCLK_BURST_POLICY 0x028
#define SYSTEM_CLK_RATE 0x030
#define SCLK_DIVIDER 0x2c
static DEFINE_SPINLOCK(sysrate_lock);
enum tegra_super_gen {
gen4 = 4,
gen5,
};
struct tegra_super_gen_info {
enum tegra_super_gen gen;
const char **sclk_parents;
const char **cclk_g_parents;
const char **cclk_lp_parents;
int num_sclk_parents;
int num_cclk_g_parents;
int num_cclk_lp_parents;
};
static const char *sclk_parents[] = { "clk_m", "pll_c_out1", "pll_p_out4",
"pll_p", "pll_p_out2", "unused",
"clk_32k", "pll_m_out1" };
static const char *cclk_g_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
"pll_p", "pll_p_out4", "unused",
"unused", "pll_x", "unused", "unused",
"unused", "unused", "unused", "unused",
"dfllCPU_out" };
static const char *cclk_lp_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
"pll_p", "pll_p_out4", "unused",
"unused", "pll_x", "pll_x_out0" };
static const struct tegra_super_gen_info tegra_super_gen_info_gen4 = {
.gen = gen4,
.sclk_parents = sclk_parents,
.cclk_g_parents = cclk_g_parents,
.cclk_lp_parents = cclk_lp_parents,
.num_sclk_parents = ARRAY_SIZE(sclk_parents),
.num_cclk_g_parents = ARRAY_SIZE(cclk_g_parents),
.num_cclk_lp_parents = ARRAY_SIZE(cclk_lp_parents),
};
static const char *sclk_parents_gen5[] = { "clk_m", "pll_c_out1", "pll_c4_out3",
"pll_p", "pll_p_out2", "pll_c4_out1",
"clk_32k", "pll_c4_out2" };
static const char *cclk_g_parents_gen5[] = { "clk_m", "unused", "clk_32k", "unused",
"pll_p", "pll_p_out4", "unused",
"unused", "pll_x", "unused", "unused",
"unused", "unused", "unused", "unused",
"dfllCPU_out" };
static const char *cclk_lp_parents_gen5[] = { "clk_m", "unused", "clk_32k", "unused",
"pll_p", "pll_p_out4", "unused",
"unused", "pll_x", "unused", "unused",
"unused", "unused", "unused", "unused",
"dfllCPU_out" };
static const struct tegra_super_gen_info tegra_super_gen_info_gen5 = {
.gen = gen5,
.sclk_parents = sclk_parents_gen5,
.cclk_g_parents = cclk_g_parents_gen5,
.cclk_lp_parents = cclk_lp_parents_gen5,
.num_sclk_parents = ARRAY_SIZE(sclk_parents_gen5),
.num_cclk_g_parents = ARRAY_SIZE(cclk_g_parents_gen5),
.num_cclk_lp_parents = ARRAY_SIZE(cclk_lp_parents_gen5),
};
static void __init tegra_sclk_init(void __iomem *clk_base,
struct tegra_clk *tegra_clks,
const struct tegra_super_gen_info *gen_info)
{
struct clk *clk;
struct clk **dt_clk;
/* SCLK_MUX */
dt_clk = tegra_lookup_dt_id(tegra_clk_sclk_mux, tegra_clks);
if (dt_clk) {
clk = tegra_clk_register_super_mux("sclk_mux",
gen_info->sclk_parents,
gen_info->num_sclk_parents,
CLK_SET_RATE_PARENT,
clk_base + SCLK_BURST_POLICY,
0, 4, 0, 0, NULL);
*dt_clk = clk;
/* SCLK */
dt_clk = tegra_lookup_dt_id(tegra_clk_sclk, tegra_clks);
if (dt_clk) {
clk = clk_register_divider(NULL, "sclk", "sclk_mux",
CLK_IS_CRITICAL,
clk_base + SCLK_DIVIDER, 0, 8,
0, &sysrate_lock);
*dt_clk = clk;
}
} else {
/* SCLK */
dt_clk = tegra_lookup_dt_id(tegra_clk_sclk, tegra_clks);
if (dt_clk) {
clk = tegra_clk_register_super_mux("sclk",
gen_info->sclk_parents,
gen_info->num_sclk_parents,
CLK_SET_RATE_PARENT |
CLK_IS_CRITICAL,
clk_base + SCLK_BURST_POLICY,
0, 4, 0, 0, NULL);
*dt_clk = clk;
}
}
/* HCLK */
dt_clk = tegra_lookup_dt_id(tegra_clk_hclk, tegra_clks);
if (dt_clk) {
clk = clk_register_divider(NULL, "hclk_div", "sclk", 0,
clk_base + SYSTEM_CLK_RATE, 4, 2, 0,
&sysrate_lock);
clk = clk_register_gate(NULL, "hclk", "hclk_div",
CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,
clk_base + SYSTEM_CLK_RATE,
7, CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
*dt_clk = clk;
}
/* PCLK */
dt_clk = tegra_lookup_dt_id(tegra_clk_pclk, tegra_clks);
if (!dt_clk)
return;
clk = clk_register_divider(NULL, "pclk_div", "hclk", 0,
clk_base + SYSTEM_CLK_RATE, 0, 2, 0,
&sysrate_lock);
clk = clk_register_gate(NULL, "pclk", "pclk_div", CLK_SET_RATE_PARENT |
CLK_IS_CRITICAL, clk_base + SYSTEM_CLK_RATE,
3, CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
*dt_clk = clk;
}
static void __init tegra_super_clk_init(void __iomem *clk_base,
void __iomem *pmc_base,
struct tegra_clk *tegra_clks,
struct tegra_clk_pll_params *params,
const struct tegra_super_gen_info *gen_info)
{
struct clk *clk;
struct clk **dt_clk;
/* CCLKG */
dt_clk = tegra_lookup_dt_id(tegra_clk_cclk_g, tegra_clks);
if (dt_clk) {
if (gen_info->gen == gen5) {
clk = tegra_clk_register_super_mux("cclk_g",
gen_info->cclk_g_parents,
gen_info->num_cclk_g_parents,
CLK_SET_RATE_PARENT,
clk_base + CCLKG_BURST_POLICY,
TEGRA210_CPU_CLK, 4, 8, 0, NULL);
} else {
clk = tegra_clk_register_super_mux("cclk_g",
gen_info->cclk_g_parents,
gen_info->num_cclk_g_parents,
CLK_SET_RATE_PARENT,
clk_base + CCLKG_BURST_POLICY,
0, 4, 0, 0, NULL);
}
*dt_clk = clk;
}
/* CCLKLP */
dt_clk = tegra_lookup_dt_id(tegra_clk_cclk_lp, tegra_clks);
if (dt_clk) {
if (gen_info->gen == gen5) {
/*
* TEGRA210_CPU_CLK flag is not needed for cclk_lp as
* cluster switching is not currently supported on
* Tegra210 and also cpu_lp is not used.
*/
clk = tegra_clk_register_super_mux("cclk_lp",
gen_info->cclk_lp_parents,
gen_info->num_cclk_lp_parents,
CLK_SET_RATE_PARENT,
clk_base + CCLKLP_BURST_POLICY,
0, 4, 8, 0, NULL);
} else {
clk = tegra_clk_register_super_mux("cclk_lp",
gen_info->cclk_lp_parents,
gen_info->num_cclk_lp_parents,
CLK_SET_RATE_PARENT,
clk_base + CCLKLP_BURST_POLICY,
TEGRA_DIVIDER_2, 4, 8, 9, NULL);
}
*dt_clk = clk;
}
tegra_sclk_init(clk_base, tegra_clks, gen_info);
#if defined(CONFIG_ARCH_TEGRA_114_SOC) || \
defined(CONFIG_ARCH_TEGRA_124_SOC) || \
defined(CONFIG_ARCH_TEGRA_210_SOC)
/* PLLX */
dt_clk = tegra_lookup_dt_id(tegra_clk_pll_x, tegra_clks);
if (!dt_clk)
return;
#if defined(CONFIG_ARCH_TEGRA_210_SOC)
if (gen_info->gen == gen5)
clk = tegra_clk_register_pllc_tegra210("pll_x", "pll_ref",
clk_base, pmc_base, CLK_IGNORE_UNUSED, params, NULL);
else
#endif
clk = tegra_clk_register_pllxc("pll_x", "pll_ref", clk_base,
pmc_base, CLK_IGNORE_UNUSED, params, NULL);
*dt_clk = clk;
/* PLLX_OUT0 */
dt_clk = tegra_lookup_dt_id(tegra_clk_pll_x_out0, tegra_clks);
if (!dt_clk)
return;
clk = clk_register_fixed_factor(NULL, "pll_x_out0", "pll_x",
CLK_SET_RATE_PARENT, 1, 2);
*dt_clk = clk;
#endif
}
void __init tegra_super_clk_gen4_init(void __iomem *clk_base,
void __iomem *pmc_base,
struct tegra_clk *tegra_clks,
struct tegra_clk_pll_params *params)
{
tegra_super_clk_init(clk_base, pmc_base, tegra_clks, params,
&tegra_super_gen_info_gen4);
}
void __init tegra_super_clk_gen5_init(void __iomem *clk_base,
void __iomem *pmc_base,
struct tegra_clk *tegra_clks,
struct tegra_clk_pll_params *params)
{
tegra_super_clk_init(clk_base, pmc_base, tegra_clks, params,
&tegra_super_gen_info_gen5);
}
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