diff options
Diffstat (limited to 'kernel/drivers/clk/tegra/clk-tegra-super-gen4.c')
| -rw-r--r-- | kernel/drivers/clk/tegra/clk-tegra-super-gen4.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/kernel/drivers/clk/tegra/clk-tegra-super-gen4.c b/kernel/drivers/clk/tegra/clk-tegra-super-gen4.c new file mode 100644 index 000000000..feb3201c8 --- /dev/null +++ b/kernel/drivers/clk/tegra/clk-tegra-super-gen4.c @@ -0,0 +1,149 @@ +/* + * 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.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" }; + +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 +} + |