mm: make wait_on_page_writeback() wait for multiple pending writebacks

[linux/fpc-iii.git] / arch / arm / mach-omap1 / clock_data.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  linux/arch/arm/mach-omap1/clock_data.c
 *
 *  Copyright (C) 2004 - 2005, 2009-2010 Nokia Corporation
 *  Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
 *  Based on clocks.h by Tony Lindgren, Gordon McNutt and RidgeRun, Inc
 *
 * To do:
 * - Clocks that are only available on some chips should be marked with the
 *   chips that they are present on.
 */

#include <linux/kernel.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <linux/delay.h>

#include <asm/mach-types.h>  /* for machine_is_* */

#include "soc.h"

#include <mach/hardware.h>
#include <mach/usb.h>   /* for OTG_BASE */

#include "iomap.h"
#include "clock.h"
#include "sram.h"

/* Some ARM_IDLECT1 bit shifts - used in struct arm_idlect1_clk */
#define IDL_CLKOUT_ARM_SHIFT                    12
#define IDLTIM_ARM_SHIFT                        9
#define IDLAPI_ARM_SHIFT                        8
#define IDLIF_ARM_SHIFT                         6
#define IDLLB_ARM_SHIFT                         4       /* undocumented? */
#define OMAP1510_IDLLCD_ARM_SHIFT               3       /* undocumented? */
#define IDLPER_ARM_SHIFT                        2
#define IDLXORP_ARM_SHIFT                       1
#define IDLWDT_ARM_SHIFT                        0

/* Some MOD_CONF_CTRL_0 bit shifts - used in struct clk.enable_bit */
#define CONF_MOD_UART3_CLK_MODE_R               31
#define CONF_MOD_UART2_CLK_MODE_R               30
#define CONF_MOD_UART1_CLK_MODE_R               29
#define CONF_MOD_MMC_SD_CLK_REQ_R               23
#define CONF_MOD_MCBSP3_AUXON                   20

/* Some MOD_CONF_CTRL_1 bit shifts - used in struct clk.enable_bit */
#define CONF_MOD_SOSSI_CLK_EN_R                 16

/* Some OTG_SYSCON_2-specific bit fields */
#define OTG_SYSCON_2_UHOST_EN_SHIFT             8

/* Some SOFT_REQ_REG bit fields - used in struct clk.enable_bit */
#define SOFT_MMC2_DPLL_REQ_SHIFT        13
#define SOFT_MMC_DPLL_REQ_SHIFT         12
#define SOFT_UART3_DPLL_REQ_SHIFT       11
#define SOFT_UART2_DPLL_REQ_SHIFT       10
#define SOFT_UART1_DPLL_REQ_SHIFT       9
#define SOFT_USB_OTG_DPLL_REQ_SHIFT     8
#define SOFT_CAM_DPLL_REQ_SHIFT         7
#define SOFT_COM_MCKO_REQ_SHIFT         6
#define SOFT_PERIPH_REQ_SHIFT           5       /* sys_ck gate for UART2 ? */
#define USB_REQ_EN_SHIFT                4
#define SOFT_USB_REQ_SHIFT              3       /* sys_ck gate for USB host? */
#define SOFT_SDW_REQ_SHIFT              2       /* sys_ck gate for Bluetooth? */
#define SOFT_COM_REQ_SHIFT              1       /* sys_ck gate for com proc? */
#define SOFT_DPLL_REQ_SHIFT             0

/*
 * Omap1 clocks
 */

static struct clk ck_ref = {
        .name           = "ck_ref",
        .ops            = &clkops_null,
        .rate           = 12000000,
};

static struct clk ck_dpll1 = {
        .name           = "ck_dpll1",
        .ops            = &clkops_null,
        .parent         = &ck_ref,
};

/*
 * FIXME: This clock seems to be necessary but no-one has asked for its
 * activation.  [ FIX: SoSSI, SSR ]
 */
static struct arm_idlect1_clk ck_dpll1out = {
        .clk = {
                .name           = "ck_dpll1out",
                .ops            = &clkops_generic,
                .parent         = &ck_dpll1,
                .flags          = CLOCK_IDLE_CONTROL | ENABLE_REG_32BIT |
                                  ENABLE_ON_INIT,
                .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
                .enable_bit     = EN_CKOUT_ARM,
                .recalc         = &followparent_recalc,
        },
        .idlect_shift   = IDL_CLKOUT_ARM_SHIFT,
};

static struct clk sossi_ck = {
        .name           = "ck_sossi",
        .ops            = &clkops_generic,
        .parent         = &ck_dpll1out.clk,
        .flags          = CLOCK_NO_IDLE_PARENT | ENABLE_REG_32BIT,
        .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_1),
        .enable_bit     = CONF_MOD_SOSSI_CLK_EN_R,
        .recalc         = &omap1_sossi_recalc,
        .set_rate       = &omap1_set_sossi_rate,
};

static struct clk arm_ck = {
        .name           = "arm_ck",
        .ops            = &clkops_null,
        .parent         = &ck_dpll1,
        .rate_offset    = CKCTL_ARMDIV_OFFSET,
        .recalc         = &omap1_ckctl_recalc,
        .round_rate     = omap1_clk_round_rate_ckctl_arm,
        .set_rate       = omap1_clk_set_rate_ckctl_arm,
};

static struct arm_idlect1_clk armper_ck = {
        .clk = {
                .name           = "armper_ck",
                .ops            = &clkops_generic,
                .parent         = &ck_dpll1,
                .flags          = CLOCK_IDLE_CONTROL,
                .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
                .enable_bit     = EN_PERCK,
                .rate_offset    = CKCTL_PERDIV_OFFSET,
                .recalc         = &omap1_ckctl_recalc,
                .round_rate     = omap1_clk_round_rate_ckctl_arm,
                .set_rate       = omap1_clk_set_rate_ckctl_arm,
        },
        .idlect_shift   = IDLPER_ARM_SHIFT,
};

/*
 * FIXME: This clock seems to be necessary but no-one has asked for its
 * activation.  [ GPIO code for 1510 ]
 */
static struct clk arm_gpio_ck = {
        .name           = "ick",
        .ops            = &clkops_generic,
        .parent         = &ck_dpll1,
        .flags          = ENABLE_ON_INIT,
        .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
        .enable_bit     = EN_GPIOCK,
        .recalc         = &followparent_recalc,
};

static struct arm_idlect1_clk armxor_ck = {
        .clk = {
                .name           = "armxor_ck",
                .ops            = &clkops_generic,
                .parent         = &ck_ref,
                .flags          = CLOCK_IDLE_CONTROL,
                .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
                .enable_bit     = EN_XORPCK,
                .recalc         = &followparent_recalc,
        },
        .idlect_shift   = IDLXORP_ARM_SHIFT,
};

static struct arm_idlect1_clk armtim_ck = {
        .clk = {
                .name           = "armtim_ck",
                .ops            = &clkops_generic,
                .parent         = &ck_ref,
                .flags          = CLOCK_IDLE_CONTROL,
                .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
                .enable_bit     = EN_TIMCK,
                .recalc         = &followparent_recalc,
        },
        .idlect_shift   = IDLTIM_ARM_SHIFT,
};

static struct arm_idlect1_clk armwdt_ck = {
        .clk = {
                .name           = "armwdt_ck",
                .ops            = &clkops_generic,
                .parent         = &ck_ref,
                .flags          = CLOCK_IDLE_CONTROL,
                .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
                .enable_bit     = EN_WDTCK,
                .fixed_div      = 14,
                .recalc         = &omap_fixed_divisor_recalc,
        },
        .idlect_shift   = IDLWDT_ARM_SHIFT,
};

static struct clk arminth_ck16xx = {
        .name           = "arminth_ck",
        .ops            = &clkops_null,
        .parent         = &arm_ck,
        .recalc         = &followparent_recalc,
        /* Note: On 16xx the frequency can be divided by 2 by programming
         * ARM_CKCTL:ARM_INTHCK_SEL(14) to 1
         *
         * 1510 version is in TC clocks.
         */
};

static struct clk dsp_ck = {
        .name           = "dsp_ck",
        .ops            = &clkops_generic,
        .parent         = &ck_dpll1,
        .enable_reg     = OMAP1_IO_ADDRESS(ARM_CKCTL),
        .enable_bit     = EN_DSPCK,
        .rate_offset    = CKCTL_DSPDIV_OFFSET,
        .recalc         = &omap1_ckctl_recalc,
        .round_rate     = omap1_clk_round_rate_ckctl_arm,
        .set_rate       = omap1_clk_set_rate_ckctl_arm,
};

static struct clk dspmmu_ck = {
        .name           = "dspmmu_ck",
        .ops            = &clkops_null,
        .parent         = &ck_dpll1,
        .rate_offset    = CKCTL_DSPMMUDIV_OFFSET,
        .recalc         = &omap1_ckctl_recalc,
        .round_rate     = omap1_clk_round_rate_ckctl_arm,
        .set_rate       = omap1_clk_set_rate_ckctl_arm,
};

static struct clk dspper_ck = {
        .name           = "dspper_ck",
        .ops            = &clkops_dspck,
        .parent         = &ck_dpll1,
        .enable_reg     = DSP_IDLECT2,
        .enable_bit     = EN_PERCK,
        .rate_offset    = CKCTL_PERDIV_OFFSET,
        .recalc         = &omap1_ckctl_recalc_dsp_domain,
        .round_rate     = omap1_clk_round_rate_ckctl_arm,
        .set_rate       = &omap1_clk_set_rate_dsp_domain,
};

static struct clk dspxor_ck = {
        .name           = "dspxor_ck",
        .ops            = &clkops_dspck,
        .parent         = &ck_ref,
        .enable_reg     = DSP_IDLECT2,
        .enable_bit     = EN_XORPCK,
        .recalc         = &followparent_recalc,
};

static struct clk dsptim_ck = {
        .name           = "dsptim_ck",
        .ops            = &clkops_dspck,
        .parent         = &ck_ref,
        .enable_reg     = DSP_IDLECT2,
        .enable_bit     = EN_DSPTIMCK,
        .recalc         = &followparent_recalc,
};

static struct arm_idlect1_clk tc_ck = {
        .clk = {
                .name           = "tc_ck",
                .ops            = &clkops_null,
                .parent         = &ck_dpll1,
                .flags          = CLOCK_IDLE_CONTROL,
                .rate_offset    = CKCTL_TCDIV_OFFSET,
                .recalc         = &omap1_ckctl_recalc,
                .round_rate     = omap1_clk_round_rate_ckctl_arm,
                .set_rate       = omap1_clk_set_rate_ckctl_arm,
        },
        .idlect_shift   = IDLIF_ARM_SHIFT,
};

static struct clk arminth_ck1510 = {
        .name           = "arminth_ck",
        .ops            = &clkops_null,
        .parent         = &tc_ck.clk,
        .recalc         = &followparent_recalc,
        /* Note: On 1510 the frequency follows TC_CK
         *
         * 16xx version is in MPU clocks.
         */
};

static struct clk tipb_ck = {
        /* No-idle controlled by "tc_ck" */
        .name           = "tipb_ck",
        .ops            = &clkops_null,
        .parent         = &tc_ck.clk,
        .recalc         = &followparent_recalc,
};

static struct clk l3_ocpi_ck = {
        /* No-idle controlled by "tc_ck" */
        .name           = "l3_ocpi_ck",
        .ops            = &clkops_generic,
        .parent         = &tc_ck.clk,
        .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT3),
        .enable_bit     = EN_OCPI_CK,
        .recalc         = &followparent_recalc,
};

static struct clk tc1_ck = {
        .name           = "tc1_ck",
        .ops            = &clkops_generic,
        .parent         = &tc_ck.clk,
        .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT3),
        .enable_bit     = EN_TC1_CK,
        .recalc         = &followparent_recalc,
};

/*
 * FIXME: This clock seems to be necessary but no-one has asked for its
 * activation.  [ pm.c (SRAM), CCP, Camera ]
 */
static struct clk tc2_ck = {
        .name           = "tc2_ck",
        .ops            = &clkops_generic,
        .parent         = &tc_ck.clk,
        .flags          = ENABLE_ON_INIT,
        .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT3),
        .enable_bit     = EN_TC2_CK,
        .recalc         = &followparent_recalc,
};

static struct clk dma_ck = {
        /* No-idle controlled by "tc_ck" */
        .name           = "dma_ck",
        .ops            = &clkops_null,
        .parent         = &tc_ck.clk,
        .recalc         = &followparent_recalc,
};

static struct clk dma_lcdfree_ck = {
        .name           = "dma_lcdfree_ck",
        .ops            = &clkops_null,
        .parent         = &tc_ck.clk,
        .recalc         = &followparent_recalc,
};

static struct arm_idlect1_clk api_ck = {
        .clk = {
                .name           = "api_ck",
                .ops            = &clkops_generic,
                .parent         = &tc_ck.clk,
                .flags          = CLOCK_IDLE_CONTROL,
                .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
                .enable_bit     = EN_APICK,
                .recalc         = &followparent_recalc,
        },
        .idlect_shift   = IDLAPI_ARM_SHIFT,
};

static struct arm_idlect1_clk lb_ck = {
        .clk = {
                .name           = "lb_ck",
                .ops            = &clkops_generic,
                .parent         = &tc_ck.clk,
                .flags          = CLOCK_IDLE_CONTROL,
                .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
                .enable_bit     = EN_LBCK,
                .recalc         = &followparent_recalc,
        },
        .idlect_shift   = IDLLB_ARM_SHIFT,
};

static struct clk rhea1_ck = {
        .name           = "rhea1_ck",
        .ops            = &clkops_null,
        .parent         = &tc_ck.clk,
        .recalc         = &followparent_recalc,
};

static struct clk rhea2_ck = {
        .name           = "rhea2_ck",
        .ops            = &clkops_null,
        .parent         = &tc_ck.clk,
        .recalc         = &followparent_recalc,
};

static struct clk lcd_ck_16xx = {
        .name           = "lcd_ck",
        .ops            = &clkops_generic,
        .parent         = &ck_dpll1,
        .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
        .enable_bit     = EN_LCDCK,
        .rate_offset    = CKCTL_LCDDIV_OFFSET,
        .recalc         = &omap1_ckctl_recalc,
        .round_rate     = omap1_clk_round_rate_ckctl_arm,
        .set_rate       = omap1_clk_set_rate_ckctl_arm,
};

static struct arm_idlect1_clk lcd_ck_1510 = {
        .clk = {
                .name           = "lcd_ck",
                .ops            = &clkops_generic,
                .parent         = &ck_dpll1,
                .flags          = CLOCK_IDLE_CONTROL,
                .enable_reg     = OMAP1_IO_ADDRESS(ARM_IDLECT2),
                .enable_bit     = EN_LCDCK,
                .rate_offset    = CKCTL_LCDDIV_OFFSET,
                .recalc         = &omap1_ckctl_recalc,
                .round_rate     = omap1_clk_round_rate_ckctl_arm,
                .set_rate       = omap1_clk_set_rate_ckctl_arm,
        },
        .idlect_shift   = OMAP1510_IDLLCD_ARM_SHIFT,
};

/*
 * XXX The enable_bit here is misused - it simply switches between 12MHz
 * and 48MHz.  Reimplement with clksel.
 *
 * XXX does this need SYSC register handling?
 */
static struct clk uart1_1510 = {
        .name           = "uart1_ck",
        .ops            = &clkops_null,
        /* Direct from ULPD, no real parent */
        .parent         = &armper_ck.clk,
        .rate           = 12000000,
        .flags          = ENABLE_REG_32BIT | CLOCK_NO_IDLE_PARENT,
        .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_0),
        .enable_bit     = CONF_MOD_UART1_CLK_MODE_R,
        .set_rate       = &omap1_set_uart_rate,
        .recalc         = &omap1_uart_recalc,
};

/*
 * XXX The enable_bit here is misused - it simply switches between 12MHz
 * and 48MHz.  Reimplement with clksel.
 *
 * XXX SYSC register handling does not belong in the clock framework
 */
static struct uart_clk uart1_16xx = {
        .clk    = {
                .name           = "uart1_ck",
                .ops            = &clkops_uart_16xx,
                /* Direct from ULPD, no real parent */
                .parent         = &armper_ck.clk,
                .rate           = 48000000,
                .flags          = ENABLE_REG_32BIT | CLOCK_NO_IDLE_PARENT,
                .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_0),
                .enable_bit     = CONF_MOD_UART1_CLK_MODE_R,
        },
        .sysc_addr      = 0xfffb0054,
};

/*
 * XXX The enable_bit here is misused - it simply switches between 12MHz
 * and 48MHz.  Reimplement with clksel.
 *
 * XXX does this need SYSC register handling?
 */
static struct clk uart2_ck = {
        .name           = "uart2_ck",
        .ops            = &clkops_null,
        /* Direct from ULPD, no real parent */
        .parent         = &armper_ck.clk,
        .rate           = 12000000,
        .flags          = ENABLE_REG_32BIT | CLOCK_NO_IDLE_PARENT,
        .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_0),
        .enable_bit     = CONF_MOD_UART2_CLK_MODE_R,
        .set_rate       = &omap1_set_uart_rate,
        .recalc         = &omap1_uart_recalc,
};

/*
 * XXX The enable_bit here is misused - it simply switches between 12MHz
 * and 48MHz.  Reimplement with clksel.
 *
 * XXX does this need SYSC register handling?
 */
static struct clk uart3_1510 = {
        .name           = "uart3_ck",
        .ops            = &clkops_null,
        /* Direct from ULPD, no real parent */
        .parent         = &armper_ck.clk,
        .rate           = 12000000,
        .flags          = ENABLE_REG_32BIT | CLOCK_NO_IDLE_PARENT,
        .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_0),
        .enable_bit     = CONF_MOD_UART3_CLK_MODE_R,
        .set_rate       = &omap1_set_uart_rate,
        .recalc         = &omap1_uart_recalc,
};

/*
 * XXX The enable_bit here is misused - it simply switches between 12MHz
 * and 48MHz.  Reimplement with clksel.
 *
 * XXX SYSC register handling does not belong in the clock framework
 */
static struct uart_clk uart3_16xx = {
        .clk    = {
                .name           = "uart3_ck",
                .ops            = &clkops_uart_16xx,
                /* Direct from ULPD, no real parent */
                .parent         = &armper_ck.clk,
                .rate           = 48000000,
                .flags          = ENABLE_REG_32BIT | CLOCK_NO_IDLE_PARENT,
                .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_0),
                .enable_bit     = CONF_MOD_UART3_CLK_MODE_R,
        },
        .sysc_addr      = 0xfffb9854,
};

static struct clk usb_clko = {  /* 6 MHz output on W4_USB_CLKO */
        .name           = "usb_clko",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent */
        .rate           = 6000000,
        .flags          = ENABLE_REG_32BIT,
        .enable_reg     = OMAP1_IO_ADDRESS(ULPD_CLOCK_CTRL),
        .enable_bit     = USB_MCLK_EN_BIT,
};

static struct clk usb_hhc_ck1510 = {
        .name           = "usb_hhc_ck",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent */
        .rate           = 48000000, /* Actually 2 clocks, 12MHz and 48MHz */
        .flags          = ENABLE_REG_32BIT,
        .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_0),
        .enable_bit     = USB_HOST_HHC_UHOST_EN,
};

static struct clk usb_hhc_ck16xx = {
        .name           = "usb_hhc_ck",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent */
        .rate           = 48000000,
        /* OTG_SYSCON_2.OTG_PADEN == 0 (not 1510-compatible) */
        .flags          = ENABLE_REG_32BIT,
        .enable_reg     = OMAP1_IO_ADDRESS(OTG_BASE + 0x08), /* OTG_SYSCON_2 */
        .enable_bit     = OTG_SYSCON_2_UHOST_EN_SHIFT
};

static struct clk usb_dc_ck = {
        .name           = "usb_dc_ck",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent */
        .rate           = 48000000,
        .enable_reg     = OMAP1_IO_ADDRESS(SOFT_REQ_REG),
        .enable_bit     = SOFT_USB_OTG_DPLL_REQ_SHIFT,
};

static struct clk uart1_7xx = {
        .name           = "uart1_ck",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent */
        .rate           = 12000000,
        .enable_reg     = OMAP1_IO_ADDRESS(SOFT_REQ_REG),
        .enable_bit     = 9,
};

static struct clk uart2_7xx = {
        .name           = "uart2_ck",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent */
        .rate           = 12000000,
        .enable_reg     = OMAP1_IO_ADDRESS(SOFT_REQ_REG),
        .enable_bit     = 11,
};

static struct clk mclk_1510 = {
        .name           = "mclk",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent. May be enabled by ext hardware. */
        .rate           = 12000000,
        .enable_reg     = OMAP1_IO_ADDRESS(SOFT_REQ_REG),
        .enable_bit     = SOFT_COM_MCKO_REQ_SHIFT,
};

static struct clk mclk_16xx = {
        .name           = "mclk",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent. May be enabled by ext hardware. */
        .enable_reg     = OMAP1_IO_ADDRESS(COM_CLK_DIV_CTRL_SEL),
        .enable_bit     = COM_ULPD_PLL_CLK_REQ,
        .set_rate       = &omap1_set_ext_clk_rate,
        .round_rate     = &omap1_round_ext_clk_rate,
        .init           = &omap1_init_ext_clk,
};

static struct clk bclk_1510 = {
        .name           = "bclk",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent. May be enabled by ext hardware. */
        .rate           = 12000000,
};

static struct clk bclk_16xx = {
        .name           = "bclk",
        .ops            = &clkops_generic,
        /* Direct from ULPD, no parent. May be enabled by ext hardware. */
        .enable_reg     = OMAP1_IO_ADDRESS(SWD_CLK_DIV_CTRL_SEL),
        .enable_bit     = SWD_ULPD_PLL_CLK_REQ,
        .set_rate       = &omap1_set_ext_clk_rate,
        .round_rate     = &omap1_round_ext_clk_rate,
        .init           = &omap1_init_ext_clk,
};

static struct clk mmc1_ck = {
        .name           = "mmc1_ck",
        .ops            = &clkops_generic,
        /* Functional clock is direct from ULPD, interface clock is ARMPER */
        .parent         = &armper_ck.clk,
        .rate           = 48000000,
        .flags          = ENABLE_REG_32BIT | CLOCK_NO_IDLE_PARENT,
        .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_0),
        .enable_bit     = CONF_MOD_MMC_SD_CLK_REQ_R,
};

/*
 * XXX MOD_CONF_CTRL_0 bit 20 is defined in the 1510 TRM as
 * CONF_MOD_MCBSP3_AUXON ??
 */
static struct clk mmc2_ck = {
        .name           = "mmc2_ck",
        .ops            = &clkops_generic,
        /* Functional clock is direct from ULPD, interface clock is ARMPER */
        .parent         = &armper_ck.clk,
        .rate           = 48000000,
        .flags          = ENABLE_REG_32BIT | CLOCK_NO_IDLE_PARENT,
        .enable_reg     = OMAP1_IO_ADDRESS(MOD_CONF_CTRL_0),
        .enable_bit     = 20,
};

static struct clk mmc3_ck = {
        .name           = "mmc3_ck",
        .ops            = &clkops_generic,
        /* Functional clock is direct from ULPD, interface clock is ARMPER */
        .parent         = &armper_ck.clk,
        .rate           = 48000000,
        .flags          = ENABLE_REG_32BIT | CLOCK_NO_IDLE_PARENT,
        .enable_reg     = OMAP1_IO_ADDRESS(SOFT_REQ_REG),
        .enable_bit     = SOFT_MMC_DPLL_REQ_SHIFT,
};

static struct clk virtual_ck_mpu = {
        .name           = "mpu",
        .ops            = &clkops_null,
        .parent         = &arm_ck, /* Is smarter alias for */
        .recalc         = &followparent_recalc,
        .set_rate       = &omap1_select_table_rate,
        .round_rate     = &omap1_round_to_table_rate,
};

/* virtual functional clock domain for I2C. Just for making sure that ARMXOR_CK
remains active during MPU idle whenever this is enabled */
static struct clk i2c_fck = {
        .name           = "i2c_fck",
        .ops            = &clkops_null,
        .flags          = CLOCK_NO_IDLE_PARENT,
        .parent         = &armxor_ck.clk,
        .recalc         = &followparent_recalc,
};

static struct clk i2c_ick = {
        .name           = "i2c_ick",
        .ops            = &clkops_null,
        .flags          = CLOCK_NO_IDLE_PARENT,
        .parent         = &armper_ck.clk,
        .recalc         = &followparent_recalc,
};

/*
 * clkdev integration
 */

static struct omap_clk omap_clks[] = {
        /* non-ULPD clocks */
        CLK(NULL,       "ck_ref",       &ck_ref,        CK_16XX | CK_1510 | CK_310 | CK_7XX),
        CLK(NULL,       "ck_dpll1",     &ck_dpll1,      CK_16XX | CK_1510 | CK_310 | CK_7XX),
        /* CK_GEN1 clocks */
        CLK(NULL,       "ck_dpll1out",  &ck_dpll1out.clk, CK_16XX),
        CLK(NULL,       "ck_sossi",     &sossi_ck,      CK_16XX),
        CLK(NULL,       "arm_ck",       &arm_ck,        CK_16XX | CK_1510 | CK_310),
        CLK(NULL,       "armper_ck",    &armper_ck.clk, CK_16XX | CK_1510 | CK_310),
        CLK("omap_gpio.0", "ick",       &arm_gpio_ck,   CK_1510 | CK_310),
        CLK(NULL,       "armxor_ck",    &armxor_ck.clk, CK_16XX | CK_1510 | CK_310 | CK_7XX),
        CLK(NULL,       "armtim_ck",    &armtim_ck.clk, CK_16XX | CK_1510 | CK_310),
        CLK("omap_wdt", "fck",          &armwdt_ck.clk, CK_16XX | CK_1510 | CK_310),
        CLK("omap_wdt", "ick",          &armper_ck.clk, CK_16XX),
        CLK("omap_wdt", "ick",          &dummy_ck,      CK_1510 | CK_310),
        CLK(NULL,       "arminth_ck",   &arminth_ck1510, CK_1510 | CK_310),
        CLK(NULL,       "arminth_ck",   &arminth_ck16xx, CK_16XX),
        /* CK_GEN2 clocks */
        CLK(NULL,       "dsp_ck",       &dsp_ck,        CK_16XX | CK_1510 | CK_310),
        CLK(NULL,       "dspmmu_ck",    &dspmmu_ck,     CK_16XX | CK_1510 | CK_310),
        CLK(NULL,       "dspper_ck",    &dspper_ck,     CK_16XX | CK_1510 | CK_310),
        CLK(NULL,       "dspxor_ck",    &dspxor_ck,     CK_16XX | CK_1510 | CK_310),
        CLK(NULL,       "dsptim_ck",    &dsptim_ck,     CK_16XX | CK_1510 | CK_310),
        /* CK_GEN3 clocks */
        CLK(NULL,       "tc_ck",        &tc_ck.clk,     CK_16XX | CK_1510 | CK_310 | CK_7XX),
        CLK(NULL,       "tipb_ck",      &tipb_ck,       CK_1510 | CK_310),
        CLK(NULL,       "l3_ocpi_ck",   &l3_ocpi_ck,    CK_16XX | CK_7XX),
        CLK(NULL,       "tc1_ck",       &tc1_ck,        CK_16XX),
        CLK(NULL,       "tc2_ck",       &tc2_ck,        CK_16XX),
        CLK(NULL,       "dma_ck",       &dma_ck,        CK_16XX | CK_1510 | CK_310),
        CLK(NULL,       "dma_lcdfree_ck", &dma_lcdfree_ck, CK_16XX),
        CLK(NULL,       "api_ck",       &api_ck.clk,    CK_16XX | CK_1510 | CK_310 | CK_7XX),
        CLK(NULL,       "lb_ck",        &lb_ck.clk,     CK_1510 | CK_310),
        CLK(NULL,       "rhea1_ck",     &rhea1_ck,      CK_16XX),
        CLK(NULL,       "rhea2_ck",     &rhea2_ck,      CK_16XX),
        CLK(NULL,       "lcd_ck",       &lcd_ck_16xx,   CK_16XX | CK_7XX),
        CLK(NULL,       "lcd_ck",       &lcd_ck_1510.clk, CK_1510 | CK_310),
        /* ULPD clocks */
        CLK(NULL,       "uart1_ck",     &uart1_1510,    CK_1510 | CK_310),
        CLK(NULL,       "uart1_ck",     &uart1_16xx.clk, CK_16XX),
        CLK(NULL,       "uart1_ck",     &uart1_7xx,     CK_7XX),
        CLK(NULL,       "uart2_ck",     &uart2_ck,      CK_16XX | CK_1510 | CK_310),
        CLK(NULL,       "uart2_ck",     &uart2_7xx,     CK_7XX),
        CLK(NULL,       "uart3_ck",     &uart3_1510,    CK_1510 | CK_310),
        CLK(NULL,       "uart3_ck",     &uart3_16xx.clk, CK_16XX),
        CLK(NULL,       "usb_clko",     &usb_clko,      CK_16XX | CK_1510 | CK_310),
        CLK(NULL,       "usb_hhc_ck",   &usb_hhc_ck1510, CK_1510 | CK_310),
        CLK(NULL,       "usb_hhc_ck",   &usb_hhc_ck16xx, CK_16XX),
        CLK(NULL,       "usb_dc_ck",    &usb_dc_ck,     CK_16XX | CK_7XX),
        CLK(NULL,       "mclk",         &mclk_1510,     CK_1510 | CK_310),
        CLK(NULL,       "mclk",         &mclk_16xx,     CK_16XX),
        CLK(NULL,       "bclk",         &bclk_1510,     CK_1510 | CK_310),
        CLK(NULL,       "bclk",         &bclk_16xx,     CK_16XX),
        CLK("mmci-omap.0", "fck",       &mmc1_ck,       CK_16XX | CK_1510 | CK_310),
        CLK("mmci-omap.0", "fck",       &mmc3_ck,       CK_7XX),
        CLK("mmci-omap.0", "ick",       &armper_ck.clk, CK_16XX | CK_1510 | CK_310 | CK_7XX),
        CLK("mmci-omap.1", "fck",       &mmc2_ck,       CK_16XX),
        CLK("mmci-omap.1", "ick",       &armper_ck.clk, CK_16XX),
        /* Virtual clocks */
        CLK(NULL,       "mpu",          &virtual_ck_mpu, CK_16XX | CK_1510 | CK_310),
        CLK("omap_i2c.1", "fck",        &i2c_fck,       CK_16XX | CK_1510 | CK_310 | CK_7XX),
        CLK("omap_i2c.1", "ick",        &i2c_ick,       CK_16XX),
        CLK("omap_i2c.1", "ick",        &dummy_ck,      CK_1510 | CK_310 | CK_7XX),
        CLK("omap1_spi100k.1", "fck",   &dummy_ck,      CK_7XX),
        CLK("omap1_spi100k.1", "ick",   &dummy_ck,      CK_7XX),
        CLK("omap1_spi100k.2", "fck",   &dummy_ck,      CK_7XX),
        CLK("omap1_spi100k.2", "ick",   &dummy_ck,      CK_7XX),
        CLK("omap_uwire", "fck",        &armxor_ck.clk, CK_16XX | CK_1510 | CK_310),
        CLK("omap-mcbsp.1", "ick",      &dspper_ck,     CK_16XX),
        CLK("omap-mcbsp.1", "ick",      &dummy_ck,      CK_1510 | CK_310),
        CLK("omap-mcbsp.2", "ick",      &armper_ck.clk, CK_16XX),
        CLK("omap-mcbsp.2", "ick",      &dummy_ck,      CK_1510 | CK_310),
        CLK("omap-mcbsp.3", "ick",      &dspper_ck,     CK_16XX),
        CLK("omap-mcbsp.3", "ick",      &dummy_ck,      CK_1510 | CK_310),
        CLK("omap-mcbsp.1", "fck",      &dspxor_ck,     CK_16XX | CK_1510 | CK_310),
        CLK("omap-mcbsp.2", "fck",      &armper_ck.clk, CK_16XX | CK_1510 | CK_310),
        CLK("omap-mcbsp.3", "fck",      &dspxor_ck,     CK_16XX | CK_1510 | CK_310),
};

/*
 * init
 */

static void __init omap1_show_rates(void)
{
        pr_notice("Clocking rate (xtal/DPLL1/MPU): %ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
                  ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
                  ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
                  arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
}

u32 cpu_mask;

int __init omap1_clk_init(void)
{
        struct omap_clk *c;
        int crystal_type = 0; /* Default 12 MHz */
        u32 reg;

#ifdef CONFIG_DEBUG_LL
        /*
         * Resets some clocks that may be left on from bootloader,
         * but leaves serial clocks on.
         */
        omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
#endif

        /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
        reg = omap_readw(SOFT_REQ_REG) & (1 << 4);
        omap_writew(reg, SOFT_REQ_REG);
        if (!cpu_is_omap15xx())
                omap_writew(0, SOFT_REQ_REG2);

        /* By default all idlect1 clocks are allowed to idle */
        arm_idlect1_mask = ~0;

        for (c = omap_clks; c < omap_clks + ARRAY_SIZE(omap_clks); c++)
                clk_preinit(c->lk.clk);

        cpu_mask = 0;
        if (cpu_is_omap1710())
                cpu_mask |= CK_1710;
        if (cpu_is_omap16xx())
                cpu_mask |= CK_16XX;
        if (cpu_is_omap1510())
                cpu_mask |= CK_1510;
        if (cpu_is_omap7xx())
                cpu_mask |= CK_7XX;
        if (cpu_is_omap310())
                cpu_mask |= CK_310;

        for (c = omap_clks; c < omap_clks + ARRAY_SIZE(omap_clks); c++)
                if (c->cpu & cpu_mask) {
                        clkdev_add(&c->lk);
                        clk_register(c->lk.clk);
                }

        /* Pointers to these clocks are needed by code in clock.c */
        api_ck_p = clk_get(NULL, "api_ck");
        ck_dpll1_p = clk_get(NULL, "ck_dpll1");
        ck_ref_p = clk_get(NULL, "ck_ref");

        if (cpu_is_omap7xx())
                ck_ref.rate = 13000000;
        if (cpu_is_omap16xx() && crystal_type == 2)
                ck_ref.rate = 19200000;

        pr_info("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
                omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
                omap_readw(ARM_CKCTL));

        /* We want to be in syncronous scalable mode */
        omap_writew(0x1000, ARM_SYSST);


        /*
         * Initially use the values set by bootloader. Determine PLL rate and
         * recalculate dependent clocks as if kernel had changed PLL or
         * divisors. See also omap1_clk_late_init() that can reprogram dpll1
         * after the SRAM is initialized.
         */
        {
                unsigned pll_ctl_val = omap_readw(DPLL_CTL);

                ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
                if (pll_ctl_val & 0x10) {
                        /* PLL enabled, apply multiplier and divisor */
                        if (pll_ctl_val & 0xf80)
                                ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
                        ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
                } else {
                        /* PLL disabled, apply bypass divisor */
                        switch (pll_ctl_val & 0xc) {
                        case 0:
                                break;
                        case 0x4:
                                ck_dpll1.rate /= 2;
                                break;
                        default:
                                ck_dpll1.rate /= 4;
                                break;
                        }
                }
        }
        propagate_rate(&ck_dpll1);
        /* Cache rates for clocks connected to ck_ref (not dpll1) */
        propagate_rate(&ck_ref);
        omap1_show_rates();
        if (machine_is_omap_perseus2() || machine_is_omap_fsample()) {
                /* Select slicer output as OMAP input clock */
                omap_writew(omap_readw(OMAP7XX_PCC_UPLD_CTRL) & ~0x1,
                                OMAP7XX_PCC_UPLD_CTRL);
        }

        /* Amstrad Delta wants BCLK high when inactive */
        if (machine_is_ams_delta())
                omap_writel(omap_readl(ULPD_CLOCK_CTRL) |
                                (1 << SDW_MCLK_INV_BIT),
                                ULPD_CLOCK_CTRL);

        /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
        /* (on 730, bit 13 must not be cleared) */
        if (cpu_is_omap7xx())
                omap_writew(omap_readw(ARM_CKCTL) & 0x2fff, ARM_CKCTL);
        else
                omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);

        /* Put DSP/MPUI into reset until needed */
        omap_writew(0, ARM_RSTCT1);
        omap_writew(1, ARM_RSTCT2);
        omap_writew(0x400, ARM_IDLECT1);

        /*
         * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
         * of the ARM_IDLECT2 register must be set to zero. The power-on
         * default value of this bit is one.
         */
        omap_writew(0x0000, ARM_IDLECT2);       /* Turn LCD clock off also */

        /*
         * Only enable those clocks we will need, let the drivers
         * enable other clocks as necessary
         */
        clk_enable(&armper_ck.clk);
        clk_enable(&armxor_ck.clk);
        clk_enable(&armtim_ck.clk); /* This should be done by timer code */

        if (cpu_is_omap15xx())
                clk_enable(&arm_gpio_ck);

        return 0;
}

#define OMAP1_DPLL1_SANE_VALUE  60000000

void __init omap1_clk_late_init(void)
{
        unsigned long rate = ck_dpll1.rate;

        /* Find the highest supported frequency and enable it */
        if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
                pr_err("System frequencies not set, using default. Check your config.\n");
                /*
                 * Reprogramming the DPLL is tricky, it must be done from SRAM.
                 */
                omap_sram_reprogram_clock(0x2290, 0x0005);
                ck_dpll1.rate = OMAP1_DPLL1_SANE_VALUE;
        }
        propagate_rate(&ck_dpll1);
        omap1_show_rates();
        loops_per_jiffy = cpufreq_scale(loops_per_jiffy, rate, ck_dpll1.rate);
}