clk-tegra-super-gen4.c
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/*
* Copyright (c) 2012, 2013, NVIDIA CORPORATION. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#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
static DEFINE_SPINLOCK(sysrate_lock);
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 void __init tegra_sclk_init(void __iomem *clk_base,
struct tegra_clk *tegra_clks)
{
struct clk *clk;
struct clk **dt_clk;
/* SCLK */
dt_clk = tegra_lookup_dt_id(tegra_clk_sclk, tegra_clks);
if (dt_clk) {
clk = tegra_clk_register_super_mux("sclk", sclk_parents,
ARRAY_SIZE(sclk_parents),
CLK_SET_RATE_PARENT,
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_IGNORE_UNUSED,
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_IGNORE_UNUSED, clk_base + SYSTEM_CLK_RATE,
3, CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
*dt_clk = clk;
}
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)
{
struct clk *clk;
struct clk **dt_clk;
/* CCLKG */
dt_clk = tegra_lookup_dt_id(tegra_clk_cclk_g, tegra_clks);
if (dt_clk) {
clk = tegra_clk_register_super_mux("cclk_g", cclk_g_parents,
ARRAY_SIZE(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) {
clk = tegra_clk_register_super_mux("cclk_lp", cclk_lp_parents,
ARRAY_SIZE(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);
#if defined(CONFIG_ARCH_TEGRA_114_SOC) || defined(CONFIG_ARCH_TEGRA_124_SOC)
/* PLLX */
dt_clk = tegra_lookup_dt_id(tegra_clk_pll_x, tegra_clks);
if (!dt_clk)
return;
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
}