/*
 * Copyright (c) 2012, 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/clkdev.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/clk/tegra.h>
#include <linux/delay.h>

#include "clk.h"

#define RST_DEVICES_L 0x004
#define RST_DEVICES_H 0x008
#define RST_DEVICES_U 0x00c
#define RST_DEVICES_SET_L 0x300
#define RST_DEVICES_CLR_L 0x304
#define RST_DEVICES_SET_H 0x308
#define RST_DEVICES_CLR_H 0x30c
#define RST_DEVICES_SET_U 0x310
#define RST_DEVICES_CLR_U 0x314
#define RST_DEVICES_NUM 3

#define CLK_OUT_ENB_L 0x010
#define CLK_OUT_ENB_H 0x014
#define CLK_OUT_ENB_U 0x018
#define CLK_OUT_ENB_SET_L 0x320
#define CLK_OUT_ENB_CLR_L 0x324
#define CLK_OUT_ENB_SET_H 0x328
#define CLK_OUT_ENB_CLR_H 0x32c
#define CLK_OUT_ENB_SET_U 0x330
#define CLK_OUT_ENB_CLR_U 0x334
#define CLK_OUT_ENB_NUM 3

#define OSC_CTRL 0x50
#define OSC_CTRL_OSC_FREQ_MASK (3<<30)
#define OSC_CTRL_OSC_FREQ_13MHZ (0<<30)
#define OSC_CTRL_OSC_FREQ_19_2MHZ (1<<30)
#define OSC_CTRL_OSC_FREQ_12MHZ (2<<30)
#define OSC_CTRL_OSC_FREQ_26MHZ (3<<30)
#define OSC_CTRL_MASK (0x3f2 | OSC_CTRL_OSC_FREQ_MASK)

#define OSC_CTRL_PLL_REF_DIV_MASK (3<<28)
#define OSC_CTRL_PLL_REF_DIV_1		(0<<28)
#define OSC_CTRL_PLL_REF_DIV_2		(1<<28)
#define OSC_CTRL_PLL_REF_DIV_4		(2<<28)

#define OSC_FREQ_DET 0x58
#define OSC_FREQ_DET_TRIG (1<<31)

#define OSC_FREQ_DET_STATUS 0x5c
#define OSC_FREQ_DET_BUSY (1<<31)
#define OSC_FREQ_DET_CNT_MASK 0xFFFF

#define PLLS_BASE 0xf0
#define PLLS_MISC 0xf4
#define PLLC_BASE 0x80
#define PLLC_MISC 0x8c
#define PLLM_BASE 0x90
#define PLLM_MISC 0x9c
#define PLLP_BASE 0xa0
#define PLLP_MISC 0xac
#define PLLA_BASE 0xb0
#define PLLA_MISC 0xbc
#define PLLU_BASE 0xc0
#define PLLU_MISC 0xcc
#define PLLD_BASE 0xd0
#define PLLD_MISC 0xdc
#define PLLX_BASE 0xe0
#define PLLX_MISC 0xe4
#define PLLE_BASE 0xe8
#define PLLE_MISC 0xec

#define PLL_BASE_LOCK BIT(27)
#define PLLE_MISC_LOCK BIT(11)

#define PLL_MISC_LOCK_ENABLE 18
#define PLLDU_MISC_LOCK_ENABLE 22
#define PLLE_MISC_LOCK_ENABLE 9

#define PLLC_OUT 0x84
#define PLLM_OUT 0x94
#define PLLP_OUTA 0xa4
#define PLLP_OUTB 0xa8
#define PLLA_OUT 0xb4

#define CCLK_BURST_POLICY 0x20
#define SUPER_CCLK_DIVIDER 0x24
#define SCLK_BURST_POLICY 0x28
#define SUPER_SCLK_DIVIDER 0x2c
#define CLK_SYSTEM_RATE 0x30

#define CCLK_BURST_POLICY_SHIFT	28
#define CCLK_RUN_POLICY_SHIFT	4
#define CCLK_IDLE_POLICY_SHIFT	0
#define CCLK_IDLE_POLICY	1
#define CCLK_RUN_POLICY		2
#define CCLK_BURST_POLICY_PLLX	8

#define CLK_SOURCE_I2S1 0x100
#define CLK_SOURCE_I2S2 0x104
#define CLK_SOURCE_SPDIF_OUT 0x108
#define CLK_SOURCE_SPDIF_IN 0x10c
#define CLK_SOURCE_PWM 0x110
#define CLK_SOURCE_SPI 0x114
#define CLK_SOURCE_SBC1 0x134
#define CLK_SOURCE_SBC2 0x118
#define CLK_SOURCE_SBC3 0x11c
#define CLK_SOURCE_SBC4 0x1b4
#define CLK_SOURCE_XIO 0x120
#define CLK_SOURCE_TWC 0x12c
#define CLK_SOURCE_IDE 0x144
#define CLK_SOURCE_NDFLASH 0x160
#define CLK_SOURCE_VFIR 0x168
#define CLK_SOURCE_SDMMC1 0x150
#define CLK_SOURCE_SDMMC2 0x154
#define CLK_SOURCE_SDMMC3 0x1bc
#define CLK_SOURCE_SDMMC4 0x164
#define CLK_SOURCE_CVE 0x140
#define CLK_SOURCE_TVO 0x188
#define CLK_SOURCE_TVDAC 0x194
#define CLK_SOURCE_HDMI 0x18c
#define CLK_SOURCE_DISP1 0x138
#define CLK_SOURCE_DISP2 0x13c
#define CLK_SOURCE_CSITE 0x1d4
#define CLK_SOURCE_LA 0x1f8
#define CLK_SOURCE_OWR 0x1cc
#define CLK_SOURCE_NOR 0x1d0
#define CLK_SOURCE_MIPI 0x174
#define CLK_SOURCE_I2C1 0x124
#define CLK_SOURCE_I2C2 0x198
#define CLK_SOURCE_I2C3 0x1b8
#define CLK_SOURCE_DVC 0x128
#define CLK_SOURCE_UARTA 0x178
#define CLK_SOURCE_UARTB 0x17c
#define CLK_SOURCE_UARTC 0x1a0
#define CLK_SOURCE_UARTD 0x1c0
#define CLK_SOURCE_UARTE 0x1c4
#define CLK_SOURCE_3D 0x158
#define CLK_SOURCE_2D 0x15c
#define CLK_SOURCE_MPE 0x170
#define CLK_SOURCE_EPP 0x16c
#define CLK_SOURCE_HOST1X 0x180
#define CLK_SOURCE_VDE 0x1c8
#define CLK_SOURCE_VI 0x148
#define CLK_SOURCE_VI_SENSOR 0x1a8
#define CLK_SOURCE_EMC 0x19c

#define AUDIO_SYNC_CLK 0x38

#define PMC_CTRL 0x0
#define PMC_CTRL_BLINK_ENB 7
#define PMC_DPD_PADS_ORIDE 0x1c
#define PMC_DPD_PADS_ORIDE_BLINK_ENB 20
#define PMC_BLINK_TIMER 0x40

/* Tegra CPU clock and reset control regs */
#define TEGRA_CLK_RST_CONTROLLER_CLK_CPU_CMPLX		0x4c
#define TEGRA_CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET	0x340
#define TEGRA_CLK_RST_CONTROLLER_RST_CPU_CMPLX_CLR	0x344

#define CPU_CLOCK(cpu)	(0x1 << (8 + cpu))
#define CPU_RESET(cpu)	(0x1111ul << (cpu))

#ifdef CONFIG_PM_SLEEP
static struct cpu_clk_suspend_context {
	u32 pllx_misc;
	u32 pllx_base;

	u32 cpu_burst;
	u32 clk_csite_src;
	u32 cclk_divider;
} tegra20_cpu_clk_sctx;
#endif

static int periph_clk_enb_refcnt[CLK_OUT_ENB_NUM * 32];

static void __iomem *clk_base;
static void __iomem *pmc_base;

static DEFINE_SPINLOCK(pll_div_lock);
static DEFINE_SPINLOCK(sysrate_lock);

#define TEGRA_INIT_DATA_MUX(_name, _con_id, _dev_id, _parents, _offset,	\
			    _clk_num, _regs, _gate_flags, _clk_id)	\
	TEGRA_INIT_DATA(_name, _con_id, _dev_id, _parents, _offset,	\
			30, 2, 0, 0, 8, 1, TEGRA_DIVIDER_ROUND_UP,	\
			_regs, _clk_num, periph_clk_enb_refcnt,		\
			_gate_flags, _clk_id)

#define TEGRA_INIT_DATA_INT(_name, _con_id, _dev_id, _parents, _offset,	\
			    _clk_num, _regs, _gate_flags, _clk_id)	\
	TEGRA_INIT_DATA(_name, _con_id, _dev_id, _parents, _offset,	\
			30, 2, 0, 0, 8, 1, TEGRA_DIVIDER_INT, _regs,	\
			_clk_num, periph_clk_enb_refcnt, _gate_flags,	\
			_clk_id)

#define TEGRA_INIT_DATA_DIV16(_name, _con_id, _dev_id, _parents, _offset, \
			      _clk_num, _regs, _gate_flags, _clk_id)	\
	TEGRA_INIT_DATA(_name, _con_id, _dev_id, _parents, _offset,	\
			30, 2, 0, 0, 16, 0, TEGRA_DIVIDER_ROUND_UP, _regs, \
			_clk_num, periph_clk_enb_refcnt, _gate_flags,	\
			_clk_id)

#define TEGRA_INIT_DATA_NODIV(_name, _con_id, _dev_id, _parents, _offset, \
			      _mux_shift, _mux_width, _clk_num, _regs,	\
			      _gate_flags, _clk_id)			\
	TEGRA_INIT_DATA(_name, _con_id, _dev_id, _parents, _offset,	\
			_mux_shift, _mux_width, 0, 0, 0, 0, 0, _regs,	\
			_clk_num, periph_clk_enb_refcnt, _gate_flags,	\
			_clk_id)

/* IDs assigned here must be in sync with DT bindings definition
 * for Tegra20 clocks .
 */
enum tegra20_clk {
	cpu, ac97 = 3, rtc, timer, uarta, gpio = 8, sdmmc2, i2s1 = 11, i2c1,
	ndflash, sdmmc1, sdmmc4, twc, pwm, i2s2, epp, gr2d = 21, usbd, isp,
	gr3d, ide, disp2, disp1, host1x, vcp, cache2 = 31, mem, ahbdma, apbdma,
	kbc = 36, stat_mon, pmc, fuse, kfuse, sbc1, nor, spi, sbc2, xio, sbc3,
	dvc, dsi, mipi = 50, hdmi, csi, tvdac, i2c2, uartc, emc = 57, usb2,
	usb3, mpe, vde, bsea, bsev, speedo, uartd, uarte, i2c3, sbc4, sdmmc3,
	pex, owr, afi, csite, pcie_xclk, avpucq = 75, la, irama = 84, iramb,
	iramc, iramd, cram2, audio_2x, clk_d, csus = 92, cdev2, cdev1,
	uartb = 96, vfir, spdif_in, spdif_out, vi, vi_sensor, tvo, cve,
	osc, clk_32k, clk_m, sclk, cclk, hclk, pclk, blink, pll_a, pll_a_out0,
	pll_c, pll_c_out1, pll_d, pll_d_out0, pll_e, pll_m, pll_m_out1,
	pll_p, pll_p_out1, pll_p_out2, pll_p_out3, pll_p_out4, pll_s, pll_u,
	pll_x, cop, audio, pll_ref, twd, clk_max,
};

static struct clk *clks[clk_max];
static struct clk_onecell_data clk_data;

static struct tegra_clk_pll_freq_table pll_c_freq_table[] = {
	{ 12000000, 600000000, 600, 12, 0, 8 },
	{ 13000000, 600000000, 600, 13, 0, 8 },
	{ 19200000, 600000000, 500, 16, 0, 6 },
	{ 26000000, 600000000, 600, 26, 0, 8 },
	{ 0, 0, 0, 0, 0, 0 },
};

static struct tegra_clk_pll_freq_table pll_m_freq_table[] = {
	{ 12000000, 666000000, 666, 12, 0, 8},
	{ 13000000, 666000000, 666, 13, 0, 8},
	{ 19200000, 666000000, 555, 16, 0, 8},
	{ 26000000, 666000000, 666, 26, 0, 8},
	{ 12000000, 600000000, 600, 12, 0, 8},
	{ 13000000, 600000000, 600, 13, 0, 8},
	{ 19200000, 600000000, 375, 12, 0, 6},
	{ 26000000, 600000000, 600, 26, 0, 8},
	{ 0, 0, 0, 0, 0, 0 },
};

static struct tegra_clk_pll_freq_table pll_p_freq_table[] = {
	{ 12000000, 216000000, 432, 12, 1, 8},
	{ 13000000, 216000000, 432, 13, 1, 8},
	{ 19200000, 216000000, 90,   4, 1, 1},
	{ 26000000, 216000000, 432, 26, 1, 8},
	{ 12000000, 432000000, 432, 12, 0, 8},
	{ 13000000, 432000000, 432, 13, 0, 8},
	{ 19200000, 432000000, 90,   4, 0, 1},
	{ 26000000, 432000000, 432, 26, 0, 8},
	{ 0, 0, 0, 0, 0, 0 },
};

static struct tegra_clk_pll_freq_table pll_a_freq_table[] = {
	{ 28800000, 56448000, 49, 25, 0, 1},
	{ 28800000, 73728000, 64, 25, 0, 1},
	{ 28800000, 24000000,  5,  6, 0, 1},
	{ 0, 0, 0, 0, 0, 0 },
};

static struct tegra_clk_pll_freq_table pll_d_freq_table[] = {
	{ 12000000, 216000000, 216, 12, 0, 4},
	{ 13000000, 216000000, 216, 13, 0, 4},
	{ 19200000, 216000000, 135, 12, 0, 3},
	{ 26000000, 216000000, 216, 26, 0, 4},

	{ 12000000, 594000000, 594, 12, 0, 8},
	{ 13000000, 594000000, 594, 13, 0, 8},
	{ 19200000, 594000000, 495, 16, 0, 8},
	{ 26000000, 594000000, 594, 26, 0, 8},

	{ 12000000, 1000000000, 1000, 12, 0, 12},
	{ 13000000, 1000000000, 1000, 13, 0, 12},
	{ 19200000, 1000000000, 625,  12, 0, 8},
	{ 26000000, 1000000000, 1000, 26, 0, 12},

	{ 0, 0, 0, 0, 0, 0 },
};

static struct tegra_clk_pll_freq_table pll_u_freq_table[] = {
	{ 12000000, 480000000, 960, 12, 0, 0},
	{ 13000000, 480000000, 960, 13, 0, 0},
	{ 19200000, 480000000, 200, 4,  0, 0},
	{ 26000000, 480000000, 960, 26, 0, 0},
	{ 0, 0, 0, 0, 0, 0 },
};

static struct tegra_clk_pll_freq_table pll_x_freq_table[] = {
	/* 1 GHz */
	{ 12000000, 1000000000, 1000, 12, 0, 12},
	{ 13000000, 1000000000, 1000, 13, 0, 12},
	{ 19200000, 1000000000, 625,  12, 0, 8},
	{ 26000000, 1000000000, 1000, 26, 0, 12},

	/* 912 MHz */
	{ 12000000, 912000000,  912,  12, 0, 12},
	{ 13000000, 912000000,  912,  13, 0, 12},
	{ 19200000, 912000000,  760,  16, 0, 8},
	{ 26000000, 912000000,  912,  26, 0, 12},

	/* 816 MHz */
	{ 12000000, 816000000,  816,  12, 0, 12},
	{ 13000000, 816000000,  816,  13, 0, 12},
	{ 19200000, 816000000,  680,  16, 0, 8},
	{ 26000000, 816000000,  816,  26, 0, 12},

	/* 760 MHz */
	{ 12000000, 760000000,  760,  12, 0, 12},
	{ 13000000, 760000000,  760,  13, 0, 12},
	{ 19200000, 760000000,  950,  24, 0, 8},
	{ 26000000, 760000000,  760,  26, 0, 12},

	/* 750 MHz */
	{ 12000000, 750000000,  750,  12, 0, 12},
	{ 13000000, 750000000,  750,  13, 0, 12},
	{ 19200000, 750000000,  625,  16, 0, 8},
	{ 26000000, 750000000,  750,  26, 0, 12},

	/* 608 MHz */
	{ 12000000, 608000000,  608,  12, 0, 12},
	{ 13000000, 608000000,  608,  13, 0, 12},
	{ 19200000, 608000000,  380,  12, 0, 8},
	{ 26000000, 608000000,  608,  26, 0, 12},

	/* 456 MHz */
	{ 12000000, 456000000,  456,  12, 0, 12},
	{ 13000000, 456000000,  456,  13, 0, 12},
	{ 19200000, 456000000,  380,  16, 0, 8},
	{ 26000000, 456000000,  456,  26, 0, 12},

	/* 312 MHz */
	{ 12000000, 312000000,  312,  12, 0, 12},
	{ 13000000, 312000000,  312,  13, 0, 12},
	{ 19200000, 312000000,  260,  16, 0, 8},
	{ 26000000, 312000000,  312,  26, 0, 12},

	{ 0, 0, 0, 0, 0, 0 },
};

static struct tegra_clk_pll_freq_table pll_e_freq_table[] = {
	{ 12000000, 100000000,  200,  24, 0, 0 },
	{ 0, 0, 0, 0, 0, 0 },
};

/* PLL parameters */
static struct tegra_clk_pll_params pll_c_params = {
	.input_min = 2000000,
	.input_max = 31000000,
	.cf_min = 1000000,
	.cf_max = 6000000,
	.vco_min = 20000000,
	.vco_max = 1400000000,
	.base_reg = PLLC_BASE,
	.misc_reg = PLLC_MISC,
	.lock_mask = PLL_BASE_LOCK,
	.lock_enable_bit_idx = PLL_MISC_LOCK_ENABLE,
	.lock_delay = 300,
};

static struct tegra_clk_pll_params pll_m_params = {
	.input_min = 2000000,
	.input_max = 31000000,
	.cf_min = 1000000,
	.cf_max = 6000000,
	.vco_min = 20000000,
	.vco_max = 1200000000,
	.base_reg = PLLM_BASE,
	.misc_reg = PLLM_MISC,
	.lock_mask = PLL_BASE_LOCK,
	.lock_enable_bit_idx = PLL_MISC_LOCK_ENABLE,
	.lock_delay = 300,
};

static struct tegra_clk_pll_params pll_p_params = {
	.input_min = 2000000,
	.input_max = 31000000,
	.cf_min = 1000000,
	.cf_max = 6000000,
	.vco_min = 20000000,
	.vco_max = 1400000000,
	.base_reg = PLLP_BASE,
	.misc_reg = PLLP_MISC,
	.lock_mask = PLL_BASE_LOCK,
	.lock_enable_bit_idx = PLL_MISC_LOCK_ENABLE,
	.lock_delay = 300,
};

static struct tegra_clk_pll_params pll_a_params = {
	.input_min = 2000000,
	.input_max = 31000000,
	.cf_min = 1000000,
	.cf_max = 6000000,
	.vco_min = 20000000,
	.vco_max = 1400000000,
	.base_reg = PLLA_BASE,
	.misc_reg = PLLA_MISC,
	.lock_mask = PLL_BASE_LOCK,
	.lock_enable_bit_idx = PLL_MISC_LOCK_ENABLE,
	.lock_delay = 300,
};

static struct tegra_clk_pll_params pll_d_params = {
	.input_min = 2000000,
	.input_max = 40000000,
	.cf_min = 1000000,
	.cf_max = 6000000,
	.vco_min = 40000000,
	.vco_max = 1000000000,
	.base_reg = PLLD_BASE,
	.misc_reg = PLLD_MISC,
	.lock_mask = PLL_BASE_LOCK,
	.lock_enable_bit_idx = PLLDU_MISC_LOCK_ENABLE,
	.lock_delay = 1000,
};

static struct pdiv_map pllu_p[] = {
	{ .pdiv = 1, .hw_val = 1 },
	{ .pdiv = 2, .hw_val = 0 },
	{ .pdiv = 0, .hw_val = 0 },
};

static struct tegra_clk_pll_params pll_u_params = {
	.input_min = 2000000,
	.input_max = 40000000,
	.cf_min = 1000000,
	.cf_max = 6000000,
	.vco_min = 48000000,
	.vco_max = 960000000,
	.base_reg = PLLU_BASE,
	.misc_reg = PLLU_MISC,
	.lock_mask = PLL_BASE_LOCK,
	.lock_enable_bit_idx = PLLDU_MISC_LOCK_ENABLE,
	.lock_delay = 1000,
	.pdiv_tohw = pllu_p,
};

static struct tegra_clk_pll_params pll_x_params = {
	.input_min = 2000000,
	.input_max = 31000000,
	.cf_min = 1000000,
	.cf_max = 6000000,
	.vco_min = 20000000,
	.vco_max = 1200000000,
	.base_reg = PLLX_BASE,
	.misc_reg = PLLX_MISC,
	.lock_mask = PLL_BASE_LOCK,
	.lock_enable_bit_idx = PLL_MISC_LOCK_ENABLE,
	.lock_delay = 300,
};

static struct tegra_clk_pll_params pll_e_params = {
	.input_min = 12000000,
	.input_max = 12000000,
	.cf_min = 0,
	.cf_max = 0,
	.vco_min = 0,
	.vco_max = 0,
	.base_reg = PLLE_BASE,
	.misc_reg = PLLE_MISC,
	.lock_mask = PLLE_MISC_LOCK,
	.lock_enable_bit_idx = PLLE_MISC_LOCK_ENABLE,
	.lock_delay = 0,
};

/* Peripheral clock registers */
static struct tegra_clk_periph_regs periph_l_regs = {
	.enb_reg = CLK_OUT_ENB_L,
	.enb_set_reg = CLK_OUT_ENB_SET_L,
	.enb_clr_reg = CLK_OUT_ENB_CLR_L,
	.rst_reg = RST_DEVICES_L,
	.rst_set_reg = RST_DEVICES_SET_L,
	.rst_clr_reg = RST_DEVICES_CLR_L,
};

static struct tegra_clk_periph_regs periph_h_regs = {
	.enb_reg = CLK_OUT_ENB_H,
	.enb_set_reg = CLK_OUT_ENB_SET_H,
	.enb_clr_reg = CLK_OUT_ENB_CLR_H,
	.rst_reg = RST_DEVICES_H,
	.rst_set_reg = RST_DEVICES_SET_H,
	.rst_clr_reg = RST_DEVICES_CLR_H,
};

static struct tegra_clk_periph_regs periph_u_regs = {
	.enb_reg = CLK_OUT_ENB_U,
	.enb_set_reg = CLK_OUT_ENB_SET_U,
	.enb_clr_reg = CLK_OUT_ENB_CLR_U,
	.rst_reg = RST_DEVICES_U,
	.rst_set_reg = RST_DEVICES_SET_U,
	.rst_clr_reg = RST_DEVICES_CLR_U,
};

static unsigned long tegra20_clk_measure_input_freq(void)
{
	u32 osc_ctrl = readl_relaxed(clk_base + OSC_CTRL);
	u32 auto_clk_control = osc_ctrl & OSC_CTRL_OSC_FREQ_MASK;
	u32 pll_ref_div = osc_ctrl & OSC_CTRL_PLL_REF_DIV_MASK;
	unsigned long input_freq;

	switch (auto_clk_control) {
	case OSC_CTRL_OSC_FREQ_12MHZ:
		BUG_ON(pll_ref_div != OSC_CTRL_PLL_REF_DIV_1);
		input_freq = 12000000;
		break;
	case OSC_CTRL_OSC_FREQ_13MHZ:
		BUG_ON(pll_ref_div != OSC_CTRL_PLL_REF_DIV_1);
		input_freq = 13000000;
		break;
	case OSC_CTRL_OSC_FREQ_19_2MHZ:
		BUG_ON(pll_ref_div != OSC_CTRL_PLL_REF_DIV_1);
		input_freq = 19200000;
		break;
	case OSC_CTRL_OSC_FREQ_26MHZ:
		BUG_ON(pll_ref_div != OSC_CTRL_PLL_REF_DIV_1);
		input_freq = 26000000;
		break;
	default:
		pr_err("Unexpected clock autodetect value %d",
		       auto_clk_control);
		BUG();
		return 0;
	}

	return input_freq;
}

static unsigned int tegra20_get_pll_ref_div(void)
{
	u32 pll_ref_div = readl_relaxed(clk_base + OSC_CTRL) &
		OSC_CTRL_PLL_REF_DIV_MASK;

	switch (pll_ref_div) {
	case OSC_CTRL_PLL_REF_DIV_1:
		return 1;
	case OSC_CTRL_PLL_REF_DIV_2:
		return 2;
	case OSC_CTRL_PLL_REF_DIV_4:
		return 4;
	default:
		pr_err("Invalied pll ref divider %d\n", pll_ref_div);
		BUG();
	}
	return 0;
}

static void tegra20_pll_init(void)
{
	struct clk *clk;

	/* PLLC */
	clk = tegra_clk_register_pll("pll_c", "pll_ref", clk_base, NULL, 0,
			    0, &pll_c_params, TEGRA_PLL_HAS_CPCON,
			    pll_c_freq_table, NULL);
	clk_register_clkdev(clk, "pll_c", NULL);
	clks[pll_c] = clk;

	/* PLLC_OUT1 */
	clk = tegra_clk_register_divider("pll_c_out1_div", "pll_c",
				clk_base + PLLC_OUT, 0, TEGRA_DIVIDER_ROUND_UP,
				8, 8, 1, NULL);
	clk = tegra_clk_register_pll_out("pll_c_out1", "pll_c_out1_div",
				clk_base + PLLC_OUT, 1, 0, CLK_SET_RATE_PARENT,
				0, NULL);
	clk_register_clkdev(clk, "pll_c_out1", NULL);
	clks[pll_c_out1] = clk;

	/* PLLP */
	clk = tegra_clk_register_pll("pll_p", "pll_ref", clk_base, NULL, 0,
			    216000000, &pll_p_params, TEGRA_PLL_FIXED |
			    TEGRA_PLL_HAS_CPCON, pll_p_freq_table, NULL);
	clk_register_clkdev(clk, "pll_p", NULL);
	clks[pll_p] = clk;

	/* PLLP_OUT1 */
	clk = tegra_clk_register_divider("pll_p_out1_div", "pll_p",
				clk_base + PLLP_OUTA, 0,
				TEGRA_DIVIDER_FIXED | TEGRA_DIVIDER_ROUND_UP,
				8, 8, 1, &pll_div_lock);
	clk = tegra_clk_register_pll_out("pll_p_out1", "pll_p_out1_div",
				clk_base + PLLP_OUTA, 1, 0,
				CLK_IGNORE_UNUSED | CLK_SET_RATE_PARENT, 0,
				&pll_div_lock);
	clk_register_clkdev(clk, "pll_p_out1", NULL);
	clks[pll_p_out1] = clk;

	/* PLLP_OUT2 */
	clk = tegra_clk_register_divider("pll_p_out2_div", "pll_p",
				clk_base + PLLP_OUTA, 0,
				TEGRA_DIVIDER_FIXED | TEGRA_DIVIDER_ROUND_UP,
				24, 8, 1, &pll_div_lock);
	clk = tegra_clk_register_pll_out("pll_p_out2", "pll_p_out2_div",
				clk_base + PLLP_OUTA, 17, 16,
				CLK_IGNORE_UNUSED | CLK_SET_RATE_PARENT, 0,
				&pll_div_lock);
	clk_register_clkdev(clk, "pll_p_out2", NULL);
	clks[pll_p_out2] = clk;

	/* PLLP_OUT3 */
	clk = tegra_clk_register_divider("pll_p_out3_div", "pll_p",
				clk_base + PLLP_OUTB, 0,
				TEGRA_DIVIDER_FIXED | TEGRA_DIVIDER_ROUND_UP,
				8, 8, 1, &pll_div_lock);
	clk = tegra_clk_register_pll_out("pll_p_out3", "pll_p_out3_div",
				clk_base + PLLP_OUTB, 1, 0,
				CLK_IGNORE_UNUSED | CLK_SET_RATE_PARENT, 0,
				&pll_div_lock);
	clk_register_clkdev(clk, "pll_p_out3", NULL);
	clks[pll_p_out3] = clk;

	/* PLLP_OUT4 */
	clk = tegra_clk_register_divider("pll_p_out4_div", "pll_p",
				clk_base + PLLP_OUTB, 0,
				TEGRA_DIVIDER_FIXED | TEGRA_DIVIDER_ROUND_UP,
				24, 8, 1, &pll_div_lock);
	clk = tegra_clk_register_pll_out("pll_p_out4", "pll_p_out4_div",
				clk_base + PLLP_OUTB, 17, 16,
				CLK_IGNORE_UNUSED | CLK_SET_RATE_PARENT, 0,
				&pll_div_lock);
	clk_register_clkdev(clk, "pll_p_out4", NULL);
	clks[pll_p_out4] = clk;

	/* PLLM */
	clk = tegra_clk_register_pll("pll_m", "pll_ref", clk_base, NULL,
			    CLK_IGNORE_UNUSED | CLK_SET_RATE_GATE, 0,
			    &pll_m_params, TEGRA_PLL_HAS_CPCON,
			    pll_m_freq_table, NULL);
	clk_register_clkdev(clk, "pll_m", NULL);
	clks[pll_m] = clk;

	/* PLLM_OUT1 */
	clk = tegra_clk_register_divider("pll_m_out1_div", "pll_m",
				clk_base + PLLM_OUT, 0, TEGRA_DIVIDER_ROUND_UP,
				8, 8, 1, NULL);
	clk = tegra_clk_register_pll_out("pll_m_out1", "pll_m_out1_div",
				clk_base + PLLM_OUT, 1, 0, CLK_IGNORE_UNUSED |
				CLK_SET_RATE_PARENT, 0, NULL);
	clk_register_clkdev(clk, "pll_m_out1", NULL);
	clks[pll_m_out1] = clk;

	/* PLLX */
	clk = tegra_clk_register_pll("pll_x", "pll_ref", clk_base, NULL, 0,
			    0, &pll_x_params, TEGRA_PLL_HAS_CPCON,
			    pll_x_freq_table, NULL);
	clk_register_clkdev(clk, "pll_x", NULL);
	clks[pll_x] = clk;

	/* PLLU */
	clk = tegra_clk_register_pll("pll_u", "pll_ref", clk_base, NULL, 0,
			    0, &pll_u_params, TEGRA_PLLU | TEGRA_PLL_HAS_CPCON,
			    pll_u_freq_table, NULL);
	clk_register_clkdev(clk, "pll_u", NULL);
	clks[pll_u] = clk;

	/* PLLD */
	clk = tegra_clk_register_pll("pll_d", "pll_ref", clk_base, NULL, 0,
			    0, &pll_d_params, TEGRA_PLL_HAS_CPCON,
			    pll_d_freq_table, NULL);
	clk_register_clkdev(clk, "pll_d", NULL);
	clks[pll_d] = clk;

	/* PLLD_OUT0 */
	clk = clk_register_fixed_factor(NULL, "pll_d_out0", "pll_d",
					CLK_SET_RATE_PARENT, 1, 2);
	clk_register_clkdev(clk, "pll_d_out0", NULL);
	clks[pll_d_out0] = clk;

	/* PLLA */
	clk = tegra_clk_register_pll("pll_a", "pll_p_out1", clk_base, NULL, 0,
			    0, &pll_a_params, TEGRA_PLL_HAS_CPCON,
			    pll_a_freq_table, NULL);
	clk_register_clkdev(clk, "pll_a", NULL);
	clks[pll_a] = clk;

	/* PLLA_OUT0 */
	clk = tegra_clk_register_divider("pll_a_out0_div", "pll_a",
				clk_base + PLLA_OUT, 0, TEGRA_DIVIDER_ROUND_UP,
				8, 8, 1, NULL);
	clk = tegra_clk_register_pll_out("pll_a_out0", "pll_a_out0_div",
				clk_base + PLLA_OUT, 1, 0, CLK_IGNORE_UNUSED |
				CLK_SET_RATE_PARENT, 0, NULL);
	clk_register_clkdev(clk, "pll_a_out0", NULL);
	clks[pll_a_out0] = clk;

	/* PLLE */
	clk = tegra_clk_register_plle("pll_e", "pll_ref", clk_base, pmc_base,
			     0, 100000000, &pll_e_params,
			     0, pll_e_freq_table, NULL);
	clk_register_clkdev(clk, "pll_e", NULL);
	clks[pll_e] = clk;
}

static const char *cclk_parents[] = { "clk_m", "pll_c", "clk_32k", "pll_m",
				      "pll_p", "pll_p_out4",
				      "pll_p_out3", "clk_d", "pll_x" };
static const char *sclk_parents[] = { "clk_m", "pll_c_out1", "pll_p_out4",
				      "pll_p_out3", "pll_p_out2", "clk_d",
				      "clk_32k", "pll_m_out1" };

static void tegra20_super_clk_init(void)
{
	struct clk *clk;

	/* CCLK */
	clk = tegra_clk_register_super_mux("cclk", cclk_parents,
			      ARRAY_SIZE(cclk_parents), CLK_SET_RATE_PARENT,
			      clk_base + CCLK_BURST_POLICY, 0, 4, 0, 0, NULL);
	clk_register_clkdev(clk, "cclk", NULL);
	clks[cclk] = clk;

	/* SCLK */
	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);
	clk_register_clkdev(clk, "sclk", NULL);
	clks[sclk] = clk;

	/* HCLK */
	clk = clk_register_divider(NULL, "hclk_div", "sclk", 0,
				   clk_base + CLK_SYSTEM_RATE, 4, 2, 0,
				   &sysrate_lock);
	clk = clk_register_gate(NULL, "hclk", "hclk_div", CLK_SET_RATE_PARENT,
				clk_base + CLK_SYSTEM_RATE, 7,
				CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
	clk_register_clkdev(clk, "hclk", NULL);
	clks[hclk] = clk;

	/* PCLK */
	clk = clk_register_divider(NULL, "pclk_div", "hclk", 0,
				   clk_base + CLK_SYSTEM_RATE, 0, 2, 0,
				   &sysrate_lock);
	clk = clk_register_gate(NULL, "pclk", "pclk_div", CLK_SET_RATE_PARENT,
				clk_base + CLK_SYSTEM_RATE, 3,
				CLK_GATE_SET_TO_DISABLE, &sysrate_lock);
	clk_register_clkdev(clk, "pclk", NULL);
	clks[pclk] = clk;

	/* twd */
	clk = clk_register_fixed_factor(NULL, "twd", "cclk", 0, 1, 4);
	clk_register_clkdev(clk, "twd", NULL);
	clks[twd] = clk;
}

static const char *audio_parents[] = {"spdif_in", "i2s1", "i2s2", "unused",
				      "pll_a_out0", "unused", "unused",
				      "unused"};

static void __init tegra20_audio_clk_init(void)
{
	struct clk *clk;

	/* audio */
	clk = clk_register_mux(NULL, "audio_mux", audio_parents,
				ARRAY_SIZE(audio_parents), 0,
				clk_base + AUDIO_SYNC_CLK, 0, 3, 0, NULL);
	clk = clk_register_gate(NULL, "audio", "audio_mux", 0,
				clk_base + AUDIO_SYNC_CLK, 4,
				CLK_GATE_SET_TO_DISABLE, NULL);
	clk_register_clkdev(clk, "audio", NULL);
	clks[audio] = clk;

	/* audio_2x */
	clk = clk_register_fixed_factor(NULL, "audio_doubler", "audio",
					CLK_SET_RATE_PARENT, 2, 1);
	clk = tegra_clk_register_periph_gate("audio_2x", "audio_doubler",
				    TEGRA_PERIPH_NO_RESET, clk_base,
				    CLK_SET_RATE_PARENT, 89, &periph_u_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "audio_2x", NULL);
	clks[audio_2x] = clk;

}

static const char *i2s1_parents[] = {"pll_a_out0", "audio_2x", "pll_p",
				     "clk_m"};
static const char *i2s2_parents[] = {"pll_a_out0", "audio_2x", "pll_p",
				     "clk_m"};
static const char *spdif_out_parents[] = {"pll_a_out0", "audio_2x", "pll_p",
					  "clk_m"};
static const char *spdif_in_parents[] = {"pll_p", "pll_c", "pll_m"};
static const char *pwm_parents[] = {"pll_p", "pll_c", "audio", "clk_m",
				    "clk_32k"};
static const char *mux_pllpcm_clkm[] = {"pll_p", "pll_c", "pll_m", "clk_m"};
static const char *mux_pllmcpa[] = {"pll_m", "pll_c", "pll_c", "pll_a"};
static const char *mux_pllpdc_clkm[] = {"pll_p", "pll_d_out0", "pll_c",
					"clk_m"};
static const char *mux_pllmcp_clkm[] = {"pll_m", "pll_c", "pll_p", "clk_m"};

static struct tegra_periph_init_data tegra_periph_clk_list[] = {
	TEGRA_INIT_DATA_MUX("i2s1",	NULL,		"tegra20-i2s.0", i2s1_parents,	    CLK_SOURCE_I2S1,	  11,	&periph_l_regs, TEGRA_PERIPH_ON_APB, i2s1),
	TEGRA_INIT_DATA_MUX("i2s2",	NULL,		"tegra20-i2s.1", i2s2_parents,	    CLK_SOURCE_I2S2,	  18,	&periph_l_regs, TEGRA_PERIPH_ON_APB, i2s2),
	TEGRA_INIT_DATA_MUX("spdif_out", "spdif_out",	"tegra20-spdif", spdif_out_parents, CLK_SOURCE_SPDIF_OUT, 10,	&periph_l_regs, TEGRA_PERIPH_ON_APB, spdif_out),
	TEGRA_INIT_DATA_MUX("spdif_in",	"spdif_in",	"tegra20-spdif", spdif_in_parents,  CLK_SOURCE_SPDIF_IN,  10,	&periph_l_regs, TEGRA_PERIPH_ON_APB, spdif_in),
	TEGRA_INIT_DATA_MUX("sbc1",	NULL,		"spi_tegra.0",	 mux_pllpcm_clkm,   CLK_SOURCE_SBC1,	  41,	&periph_h_regs, TEGRA_PERIPH_ON_APB, sbc1),
	TEGRA_INIT_DATA_MUX("sbc2",	NULL,		"spi_tegra.1",	 mux_pllpcm_clkm,   CLK_SOURCE_SBC2,	  44,	&periph_h_regs, TEGRA_PERIPH_ON_APB, sbc2),
	TEGRA_INIT_DATA_MUX("sbc3",	NULL,		"spi_tegra.2",	 mux_pllpcm_clkm,   CLK_SOURCE_SBC3,	  46,	&periph_h_regs, TEGRA_PERIPH_ON_APB, sbc3),
	TEGRA_INIT_DATA_MUX("sbc4",	NULL,		"spi_tegra.3",	 mux_pllpcm_clkm,   CLK_SOURCE_SBC4,	  68,	&periph_u_regs, TEGRA_PERIPH_ON_APB, sbc4),
	TEGRA_INIT_DATA_MUX("spi",	NULL,		"spi",		 mux_pllpcm_clkm,   CLK_SOURCE_SPI,	  43,	&periph_h_regs, TEGRA_PERIPH_ON_APB, spi),
	TEGRA_INIT_DATA_MUX("xio",	NULL,		"xio",		 mux_pllpcm_clkm,   CLK_SOURCE_XIO,	  45,	&periph_h_regs, 0, xio),
	TEGRA_INIT_DATA_MUX("twc",	NULL,		"twc",		 mux_pllpcm_clkm,   CLK_SOURCE_TWC,	  16,	&periph_l_regs, TEGRA_PERIPH_ON_APB, twc),
	TEGRA_INIT_DATA_MUX("ide",	NULL,		"ide",		 mux_pllpcm_clkm,   CLK_SOURCE_XIO,	  25,	&periph_l_regs, 0, ide),
	TEGRA_INIT_DATA_MUX("ndflash",	NULL,		"tegra_nand",	 mux_pllpcm_clkm,   CLK_SOURCE_NDFLASH,	  13,	&periph_l_regs, 0, ndflash),
	TEGRA_INIT_DATA_MUX("vfir",	NULL,		"vfir",		 mux_pllpcm_clkm,   CLK_SOURCE_VFIR,	  7,	&periph_l_regs, TEGRA_PERIPH_ON_APB, vfir),
	TEGRA_INIT_DATA_MUX("csite",	NULL,		"csite",	 mux_pllpcm_clkm,   CLK_SOURCE_CSITE,	  73,	&periph_u_regs, 0, csite),
	TEGRA_INIT_DATA_MUX("la",	NULL,		"la",		 mux_pllpcm_clkm,   CLK_SOURCE_LA,	  76,	&periph_u_regs, 0, la),
	TEGRA_INIT_DATA_MUX("owr",	NULL,		"tegra_w1",	 mux_pllpcm_clkm,   CLK_SOURCE_OWR,	  71,	&periph_u_regs, TEGRA_PERIPH_ON_APB, owr),
	TEGRA_INIT_DATA_MUX("mipi",	NULL,		"mipi",		 mux_pllpcm_clkm,   CLK_SOURCE_MIPI,	  50,	&periph_h_regs, TEGRA_PERIPH_ON_APB, mipi),
	TEGRA_INIT_DATA_MUX("vde",	NULL,		"vde",		 mux_pllpcm_clkm,   CLK_SOURCE_VDE,	  61,	&periph_h_regs, 0, vde),
	TEGRA_INIT_DATA_MUX("vi",	"vi",		"tegra_camera",	 mux_pllmcpa,	    CLK_SOURCE_VI,	  20,	&periph_l_regs, 0, vi),
	TEGRA_INIT_DATA_MUX("epp",	NULL,		"epp",		 mux_pllmcpa,	    CLK_SOURCE_EPP,	  19,	&periph_l_regs, 0, epp),
	TEGRA_INIT_DATA_MUX("mpe",	NULL,		"mpe",		 mux_pllmcpa,	    CLK_SOURCE_MPE,	  60,	&periph_h_regs, 0, mpe),
	TEGRA_INIT_DATA_MUX("host1x",	NULL,		"host1x",	 mux_pllmcpa,	    CLK_SOURCE_HOST1X,	  28,	&periph_l_regs, 0, host1x),
	TEGRA_INIT_DATA_MUX("3d",	NULL,		"3d",		 mux_pllmcpa,	    CLK_SOURCE_3D,	  24,	&periph_l_regs, TEGRA_PERIPH_MANUAL_RESET, gr3d),
	TEGRA_INIT_DATA_MUX("2d",	NULL,		"2d",		 mux_pllmcpa,	    CLK_SOURCE_2D,	  21,	&periph_l_regs, 0, gr2d),
	TEGRA_INIT_DATA_MUX("nor",	NULL,		"tegra-nor",	 mux_pllpcm_clkm,   CLK_SOURCE_NOR,	  42,	&periph_h_regs, 0, nor),
	TEGRA_INIT_DATA_MUX("sdmmc1",	NULL,		"sdhci-tegra.0", mux_pllpcm_clkm,   CLK_SOURCE_SDMMC1,	  14,	&periph_l_regs, 0, sdmmc1),
	TEGRA_INIT_DATA_MUX("sdmmc2",	NULL,		"sdhci-tegra.1", mux_pllpcm_clkm,   CLK_SOURCE_SDMMC2,	  9,	&periph_l_regs, 0, sdmmc2),
	TEGRA_INIT_DATA_MUX("sdmmc3",	NULL,		"sdhci-tegra.2", mux_pllpcm_clkm,   CLK_SOURCE_SDMMC3,	  69,	&periph_u_regs, 0, sdmmc3),
	TEGRA_INIT_DATA_MUX("sdmmc4",	NULL,		"sdhci-tegra.3", mux_pllpcm_clkm,   CLK_SOURCE_SDMMC4,	  15,	&periph_l_regs, 0, sdmmc4),
	TEGRA_INIT_DATA_MUX("cve",	NULL,		"cve",		 mux_pllpdc_clkm,   CLK_SOURCE_CVE,	  49,	&periph_h_regs, 0, cve),
	TEGRA_INIT_DATA_MUX("tvo",	NULL,		"tvo",		 mux_pllpdc_clkm,   CLK_SOURCE_TVO,	  49,	&periph_h_regs, 0, tvo),
	TEGRA_INIT_DATA_MUX("tvdac",	NULL,		"tvdac",	 mux_pllpdc_clkm,   CLK_SOURCE_TVDAC,	  53,	&periph_h_regs, 0, tvdac),
	TEGRA_INIT_DATA_MUX("vi_sensor", "vi_sensor",	"tegra_camera",	 mux_pllmcpa,	    CLK_SOURCE_VI_SENSOR, 20,	&periph_l_regs, TEGRA_PERIPH_NO_RESET, vi_sensor),
	TEGRA_INIT_DATA_DIV16("i2c1",	"div-clk",	"tegra-i2c.0",	 mux_pllpcm_clkm,   CLK_SOURCE_I2C1,	  12,	&periph_l_regs, TEGRA_PERIPH_ON_APB, i2c1),
	TEGRA_INIT_DATA_DIV16("i2c2",	"div-clk",	"tegra-i2c.1",	 mux_pllpcm_clkm,   CLK_SOURCE_I2C2,	  54,	&periph_h_regs, TEGRA_PERIPH_ON_APB, i2c2),
	TEGRA_INIT_DATA_DIV16("i2c3",	"div-clk",	"tegra-i2c.2",	 mux_pllpcm_clkm,   CLK_SOURCE_I2C3,	  67,	&periph_u_regs,	TEGRA_PERIPH_ON_APB, i2c3),
	TEGRA_INIT_DATA_DIV16("dvc",	"div-clk",	"tegra-i2c.3",	 mux_pllpcm_clkm,   CLK_SOURCE_DVC,	  47,	&periph_h_regs,	TEGRA_PERIPH_ON_APB, dvc),
	TEGRA_INIT_DATA_MUX("hdmi",	NULL,		"hdmi",		 mux_pllpdc_clkm,   CLK_SOURCE_HDMI,	  51,	&periph_h_regs,	0, hdmi),
	TEGRA_INIT_DATA("pwm",		NULL,		"tegra-pwm",	 pwm_parents,	    CLK_SOURCE_PWM,	  28, 3, 0, 0, 8, 1, 0, &periph_l_regs, 17, periph_clk_enb_refcnt, TEGRA_PERIPH_ON_APB, pwm),
};

static struct tegra_periph_init_data tegra_periph_nodiv_clk_list[] = {
	TEGRA_INIT_DATA_NODIV("uarta",	NULL, "tegra_uart.0", mux_pllpcm_clkm, CLK_SOURCE_UARTA, 30, 2, 6,  &periph_l_regs, TEGRA_PERIPH_ON_APB, uarta),
	TEGRA_INIT_DATA_NODIV("uartb",	NULL, "tegra_uart.1", mux_pllpcm_clkm, CLK_SOURCE_UARTB, 30, 2, 7,  &periph_l_regs, TEGRA_PERIPH_ON_APB, uartb),
	TEGRA_INIT_DATA_NODIV("uartc",	NULL, "tegra_uart.2", mux_pllpcm_clkm, CLK_SOURCE_UARTC, 30, 2, 55, &periph_h_regs, TEGRA_PERIPH_ON_APB, uartc),
	TEGRA_INIT_DATA_NODIV("uartd",	NULL, "tegra_uart.3", mux_pllpcm_clkm, CLK_SOURCE_UARTD, 30, 2, 65, &periph_u_regs, TEGRA_PERIPH_ON_APB, uartd),
	TEGRA_INIT_DATA_NODIV("uarte",	NULL, "tegra_uart.4", mux_pllpcm_clkm, CLK_SOURCE_UARTE, 30, 2, 66, &periph_u_regs, TEGRA_PERIPH_ON_APB, uarte),
	TEGRA_INIT_DATA_NODIV("disp1",	NULL, "tegradc.0",    mux_pllpdc_clkm, CLK_SOURCE_DISP1, 30, 2, 27, &periph_l_regs, 0, disp1),
	TEGRA_INIT_DATA_NODIV("disp2",	NULL, "tegradc.1",    mux_pllpdc_clkm, CLK_SOURCE_DISP2, 30, 2, 26, &periph_l_regs, 0, disp2),
};

static void __init tegra20_periph_clk_init(void)
{
	struct tegra_periph_init_data *data;
	struct clk *clk;
	int i;

	/* apbdma */
	clk = tegra_clk_register_periph_gate("apbdma", "pclk", 0, clk_base,
				    0, 34, &periph_h_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, NULL, "tegra-apbdma");
	clks[apbdma] = clk;

	/* rtc */
	clk = tegra_clk_register_periph_gate("rtc", "clk_32k",
				    TEGRA_PERIPH_NO_RESET,
				    clk_base, 0, 4, &periph_l_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, NULL, "rtc-tegra");
	clks[rtc] = clk;

	/* timer */
	clk = tegra_clk_register_periph_gate("timer", "clk_m", 0, clk_base,
				    0, 5, &periph_l_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, NULL, "timer");
	clks[timer] = clk;

	/* kbc */
	clk = tegra_clk_register_periph_gate("kbc", "clk_32k",
				    TEGRA_PERIPH_NO_RESET | TEGRA_PERIPH_ON_APB,
				    clk_base, 0, 36, &periph_h_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, NULL, "tegra-kbc");
	clks[kbc] = clk;

	/* csus */
	clk = tegra_clk_register_periph_gate("csus", "clk_m",
				    TEGRA_PERIPH_NO_RESET,
				    clk_base, 0, 92, &periph_u_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "csus", "tengra_camera");
	clks[csus] = clk;

	/* vcp */
	clk = tegra_clk_register_periph_gate("vcp", "clk_m", 0,
				    clk_base, 0, 29, &periph_l_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "vcp", "tegra-avp");
	clks[vcp] = clk;

	/* bsea */
	clk = tegra_clk_register_periph_gate("bsea", "clk_m", 0,
				    clk_base, 0, 62, &periph_h_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "bsea", "tegra-avp");
	clks[bsea] = clk;

	/* bsev */
	clk = tegra_clk_register_periph_gate("bsev", "clk_m", 0,
				    clk_base, 0, 63, &periph_h_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "bsev", "tegra-aes");
	clks[bsev] = clk;

	/* emc */
	clk = clk_register_mux(NULL, "emc_mux", mux_pllmcp_clkm,
			       ARRAY_SIZE(mux_pllmcp_clkm), 0,
			       clk_base + CLK_SOURCE_EMC,
			       30, 2, 0, NULL);
	clk = tegra_clk_register_periph_gate("emc", "emc_mux", 0, clk_base, 0,
				    57, &periph_h_regs, periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "emc", NULL);
	clks[emc] = clk;

	/* usbd */
	clk = tegra_clk_register_periph_gate("usbd", "clk_m", 0, clk_base, 0,
				    22, &periph_l_regs, periph_clk_enb_refcnt);
	clk_register_clkdev(clk, NULL, "fsl-tegra-udc");
	clks[usbd] = clk;

	/* usb2 */
	clk = tegra_clk_register_periph_gate("usb2", "clk_m", 0, clk_base, 0,
				    58, &periph_h_regs, periph_clk_enb_refcnt);
	clk_register_clkdev(clk, NULL, "tegra-ehci.1");
	clks[usb2] = clk;

	/* usb3 */
	clk = tegra_clk_register_periph_gate("usb3", "clk_m", 0, clk_base, 0,
				    59, &periph_h_regs, periph_clk_enb_refcnt);
	clk_register_clkdev(clk, NULL, "tegra-ehci.2");
	clks[usb3] = clk;

	/* dsi */
	clk = tegra_clk_register_periph_gate("dsi", "pll_d", 0, clk_base, 0,
				    48, &periph_h_regs, periph_clk_enb_refcnt);
	clk_register_clkdev(clk, NULL, "dsi");
	clks[dsi] = clk;

	/* csi */
	clk = tegra_clk_register_periph_gate("csi", "pll_p_out3", 0, clk_base,
				    0, 52, &periph_h_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "csi", "tegra_camera");
	clks[csi] = clk;

	/* isp */
	clk = tegra_clk_register_periph_gate("isp", "clk_m", 0, clk_base, 0, 23,
				    &periph_l_regs, periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "isp", "tegra_camera");
	clks[isp] = clk;

	/* pex */
	clk = tegra_clk_register_periph_gate("pex", "clk_m", 0, clk_base, 0, 70,
				    &periph_u_regs, periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "pex", NULL);
	clks[pex] = clk;

	/* afi */
	clk = tegra_clk_register_periph_gate("afi", "clk_m", 0, clk_base, 0, 72,
				    &periph_u_regs, periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "afi", NULL);
	clks[afi] = clk;

	/* pcie_xclk */
	clk = tegra_clk_register_periph_gate("pcie_xclk", "clk_m", 0, clk_base,
				    0, 74, &periph_u_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "pcie_xclk", NULL);
	clks[pcie_xclk] = clk;

	/* cdev1 */
	clk = clk_register_fixed_rate(NULL, "cdev1_fixed", NULL, CLK_IS_ROOT,
				      26000000);
	clk = tegra_clk_register_periph_gate("cdev1", "cdev1_fixed", 0,
				    clk_base, 0, 94, &periph_u_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "cdev1", NULL);
	clks[cdev1] = clk;

	/* cdev2 */
	clk = clk_register_fixed_rate(NULL, "cdev2_fixed", NULL, CLK_IS_ROOT,
				      26000000);
	clk = tegra_clk_register_periph_gate("cdev2", "cdev2_fixed", 0,
				    clk_base, 0, 93, &periph_u_regs,
				    periph_clk_enb_refcnt);
	clk_register_clkdev(clk, "cdev2", NULL);
	clks[cdev2] = clk;

	for (i = 0; i < ARRAY_SIZE(tegra_periph_clk_list); i++) {
		data = &tegra_periph_clk_list[i];
		clk = tegra_clk_register_periph(data->name, data->parent_names,
				data->num_parents, &data->periph,
				clk_base, data->offset, data->flags);
		clk_register_clkdev(clk, data->con_id, data->dev_id);
		clks[data->clk_id] = clk;
	}

	for (i = 0; i < ARRAY_SIZE(tegra_periph_nodiv_clk_list); i++) {
		data = &tegra_periph_nodiv_clk_list[i];
		clk = tegra_clk_register_periph_nodiv(data->name,
					data->parent_names,
					data->num_parents, &data->periph,
					clk_base, data->offset);
		clk_register_clkdev(clk, data->con_id, data->dev_id);
		clks[data->clk_id] = clk;
	}
}


static void __init tegra20_fixed_clk_init(void)
{
	struct clk *clk;

	/* clk_32k */
	clk = clk_register_fixed_rate(NULL, "clk_32k", NULL, CLK_IS_ROOT,
				      32768);
	clk_register_clkdev(clk, "clk_32k", NULL);
	clks[clk_32k] = clk;
}

static void __init tegra20_pmc_clk_init(void)
{
	struct clk *clk;

	/* blink */
	writel_relaxed(0, pmc_base + PMC_BLINK_TIMER);
	clk = clk_register_gate(NULL, "blink_override", "clk_32k", 0,
				pmc_base + PMC_DPD_PADS_ORIDE,
				PMC_DPD_PADS_ORIDE_BLINK_ENB, 0, NULL);
	clk = clk_register_gate(NULL, "blink", "blink_override", 0,
				pmc_base + PMC_CTRL,
				PMC_CTRL_BLINK_ENB, 0, NULL);
	clk_register_clkdev(clk, "blink", NULL);
	clks[blink] = clk;
}

static void __init tegra20_osc_clk_init(void)
{
	struct clk *clk;
	unsigned long input_freq;
	unsigned int pll_ref_div;

	input_freq = tegra20_clk_measure_input_freq();

	/* clk_m */
	clk = clk_register_fixed_rate(NULL, "clk_m", NULL, CLK_IS_ROOT |
				      CLK_IGNORE_UNUSED, input_freq);
	clk_register_clkdev(clk, "clk_m", NULL);
	clks[clk_m] = clk;

	/* pll_ref */
	pll_ref_div = tegra20_get_pll_ref_div();
	clk = clk_register_fixed_factor(NULL, "pll_ref", "clk_m",
					CLK_SET_RATE_PARENT, 1, pll_ref_div);
	clk_register_clkdev(clk, "pll_ref", NULL);
	clks[pll_ref] = clk;
}

/* Tegra20 CPU clock and reset control functions */
static void tegra20_wait_cpu_in_reset(u32 cpu)
{
	unsigned int reg;

	do {
		reg = readl(clk_base +
			    TEGRA_CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET);
		cpu_relax();
	} while (!(reg & (1 << cpu)));	/* check CPU been reset or not */

	return;
}

static void tegra20_put_cpu_in_reset(u32 cpu)
{
	writel(CPU_RESET(cpu),
	       clk_base + TEGRA_CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET);
	dmb();
}

static void tegra20_cpu_out_of_reset(u32 cpu)
{
	writel(CPU_RESET(cpu),
	       clk_base + TEGRA_CLK_RST_CONTROLLER_RST_CPU_CMPLX_CLR);
	wmb();
}

static void tegra20_enable_cpu_clock(u32 cpu)
{
	unsigned int reg;

	reg = readl(clk_base + TEGRA_CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
	writel(reg & ~CPU_CLOCK(cpu),
	       clk_base + TEGRA_CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
	barrier();
	reg = readl(clk_base + TEGRA_CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
}

static void tegra20_disable_cpu_clock(u32 cpu)
{
	unsigned int reg;

	reg = readl(clk_base + TEGRA_CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
	writel(reg | CPU_CLOCK(cpu),
	       clk_base + TEGRA_CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
}

#ifdef CONFIG_PM_SLEEP
static bool tegra20_cpu_rail_off_ready(void)
{
	unsigned int cpu_rst_status;

	cpu_rst_status = readl(clk_base +
			       TEGRA_CLK_RST_CONTROLLER_RST_CPU_CMPLX_SET);

	return !!(cpu_rst_status & 0x2);
}

static void tegra20_cpu_clock_suspend(void)
{
	/* switch coresite to clk_m, save off original source */
	tegra20_cpu_clk_sctx.clk_csite_src =
				readl(clk_base + CLK_SOURCE_CSITE);
	writel(3<<30, clk_base + CLK_SOURCE_CSITE);

	tegra20_cpu_clk_sctx.cpu_burst =
				readl(clk_base + CCLK_BURST_POLICY);
	tegra20_cpu_clk_sctx.pllx_base =
				readl(clk_base + PLLX_BASE);
	tegra20_cpu_clk_sctx.pllx_misc =
				readl(clk_base + PLLX_MISC);
	tegra20_cpu_clk_sctx.cclk_divider =
				readl(clk_base + SUPER_CCLK_DIVIDER);
}

static void tegra20_cpu_clock_resume(void)
{
	unsigned int reg, policy;

	/* Is CPU complex already running on PLLX? */
	reg = readl(clk_base + CCLK_BURST_POLICY);
	policy = (reg >> CCLK_BURST_POLICY_SHIFT) & 0xF;

	if (policy == CCLK_IDLE_POLICY)
		reg = (reg >> CCLK_IDLE_POLICY_SHIFT) & 0xF;
	else if (policy == CCLK_RUN_POLICY)
		reg = (reg >> CCLK_RUN_POLICY_SHIFT) & 0xF;
	else
		BUG();

	if (reg != CCLK_BURST_POLICY_PLLX) {
		/* restore PLLX settings if CPU is on different PLL */
		writel(tegra20_cpu_clk_sctx.pllx_misc,
					clk_base + PLLX_MISC);
		writel(tegra20_cpu_clk_sctx.pllx_base,
					clk_base + PLLX_BASE);

		/* wait for PLL stabilization if PLLX was enabled */
		if (tegra20_cpu_clk_sctx.pllx_base & (1 << 30))
			udelay(300);
	}

	/*
	 * Restore original burst policy setting for calls resulting from CPU
	 * LP2 in idle or system suspend.
	 */
	writel(tegra20_cpu_clk_sctx.cclk_divider,
					clk_base + SUPER_CCLK_DIVIDER);
	writel(tegra20_cpu_clk_sctx.cpu_burst,
					clk_base + CCLK_BURST_POLICY);

	writel(tegra20_cpu_clk_sctx.clk_csite_src,
					clk_base + CLK_SOURCE_CSITE);
}
#endif

static struct tegra_cpu_car_ops tegra20_cpu_car_ops = {
	.wait_for_reset	= tegra20_wait_cpu_in_reset,
	.put_in_reset	= tegra20_put_cpu_in_reset,
	.out_of_reset	= tegra20_cpu_out_of_reset,
	.enable_clock	= tegra20_enable_cpu_clock,
	.disable_clock	= tegra20_disable_cpu_clock,
#ifdef CONFIG_PM_SLEEP
	.rail_off_ready = tegra20_cpu_rail_off_ready,
	.suspend	= tegra20_cpu_clock_suspend,
	.resume		= tegra20_cpu_clock_resume,
#endif
};

static __initdata struct tegra_clk_init_table init_table[] = {
	{pll_p, clk_max, 216000000, 1},
	{pll_p_out1, clk_max, 28800000, 1},
	{pll_p_out2, clk_max, 48000000, 1},
	{pll_p_out3, clk_max, 72000000, 1},
	{pll_p_out4, clk_max, 24000000, 1},
	{pll_c, clk_max, 600000000, 1},
	{pll_c_out1, clk_max, 120000000, 1},
	{sclk, pll_c_out1, 0, 1},
	{hclk, clk_max, 0, 1},
	{pclk, clk_max, 60000000, 1},
	{csite, clk_max, 0, 1},
	{emc, clk_max, 0, 1},
	{cclk, clk_max, 0, 1},
	{uarta, pll_p, 0, 0},
	{uartb, pll_p, 0, 0},
	{uartc, pll_p, 0, 0},
	{uartd, pll_p, 0, 0},
	{uarte, pll_p, 0, 0},
	{usbd, clk_max, 12000000, 0},
	{usb2, clk_max, 12000000, 0},
	{usb3, clk_max, 12000000, 0},
	{pll_a, clk_max, 56448000, 1},
	{pll_a_out0, clk_max, 11289600, 1},
	{cdev1, clk_max, 0, 1},
	{blink, clk_max, 32768, 1},
	{i2s1, pll_a_out0, 11289600, 0},
	{i2s2, pll_a_out0, 11289600, 0},
	{sdmmc1, pll_p, 48000000, 0},
	{sdmmc3, pll_p, 48000000, 0},
	{sdmmc4, pll_p, 48000000, 0},
	{spi, pll_p, 20000000, 0},
	{sbc1, pll_p, 100000000, 0},
	{sbc2, pll_p, 100000000, 0},
	{sbc3, pll_p, 100000000, 0},
	{sbc4, pll_p, 100000000, 0},
	{host1x, pll_c, 150000000, 0},
	{disp1, pll_p, 600000000, 0},
	{disp2, pll_p, 600000000, 0},
	{gr2d, pll_c, 300000000, 0},
	{gr3d, pll_c, 300000000, 0},
	{clk_max, clk_max, 0, 0}, /* This MUST be the last entry */
};

static void __init tegra20_clock_apply_init_table(void)
{
	tegra_init_from_table(init_table, clks, clk_max);
}

/*
 * Some clocks may be used by different drivers depending on the board
 * configuration.  List those here to register them twice in the clock lookup
 * table under two names.
 */
static struct tegra_clk_duplicate tegra_clk_duplicates[] = {
	TEGRA_CLK_DUPLICATE(usbd,   "utmip-pad",    NULL),
	TEGRA_CLK_DUPLICATE(usbd,   "tegra-ehci.0", NULL),
	TEGRA_CLK_DUPLICATE(usbd,   "tegra-otg",    NULL),
	TEGRA_CLK_DUPLICATE(cclk,   NULL,           "cpu"),
	TEGRA_CLK_DUPLICATE(clk_max, NULL, NULL), /* Must be the last entry */
};

static const struct of_device_id pmc_match[] __initconst = {
	{ .compatible = "nvidia,tegra20-pmc" },
	{},
};

void __init tegra20_clock_init(struct device_node *np)
{
	int i;
	struct device_node *node;

	clk_base = of_iomap(np, 0);
	if (!clk_base) {
		pr_err("Can't map CAR registers\n");
		BUG();
	}

	node = of_find_matching_node(NULL, pmc_match);
	if (!node) {
		pr_err("Failed to find pmc node\n");
		BUG();
	}

	pmc_base = of_iomap(node, 0);
	if (!pmc_base) {
		pr_err("Can't map pmc registers\n");
		BUG();
	}

	tegra20_osc_clk_init();
	tegra20_pmc_clk_init();
	tegra20_fixed_clk_init();
	tegra20_pll_init();
	tegra20_super_clk_init();
	tegra20_periph_clk_init();
	tegra20_audio_clk_init();


	for (i = 0; i < ARRAY_SIZE(clks); i++) {
		if (IS_ERR(clks[i])) {
			pr_err("Tegra20 clk %d: register failed with %ld\n",
			       i, PTR_ERR(clks[i]));
			BUG();
		}
		if (!clks[i])
			clks[i] = ERR_PTR(-EINVAL);
	}

	tegra_init_dup_clks(tegra_clk_duplicates, clks, clk_max);

	clk_data.clks = clks;
	clk_data.clk_num = ARRAY_SIZE(clks);
	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);

	tegra_clk_apply_init_table = tegra20_clock_apply_init_table;

	tegra_cpu_car_ops = &tegra20_cpu_car_ops;
}
