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linux/arch/arm/mach-omap2/clock34xx.c
Tero Kristo 3afec6332e OMAP3: Add support for DPLL3 divisor values higher than 2 
Previously only 1 and 2 was supported. This is needed for DVFS VDD2 control.

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>
2009-06-19 19:09:32 -06:00

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/*
* OMAP3-specific clock framework functions
*
* Copyright (C) 2007-2008 Texas Instruments, Inc.
* Copyright (C) 2007-2008 Nokia Corporation
*
* Written by Paul Walmsley
* Testing and integration fixes by Jouni Högander
*
* Parts of this code are based on code written by
* Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#undef DEBUG
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/limits.h>
#include <linux/bitops.h>
#include <mach/clock.h>
#include <mach/sram.h>
#include <asm/div64.h>
#include <asm/clkdev.h>
#include <mach/sdrc.h>
#include "clock.h"
#include "prm.h"
#include "prm-regbits-34xx.h"
#include "cm.h"
#include "cm-regbits-34xx.h"
static const struct clkops clkops_noncore_dpll_ops;
#include "clock34xx.h"
struct omap_clk {
u32 cpu;
struct clk_lookup lk;
};
#define CLK(dev, con, ck, cp) \
{ \
.cpu = cp, \
.lk = { \
.dev_id = dev, \
.con_id = con, \
.clk = ck, \
}, \
}
#define CK_343X (1 << 0)
#define CK_3430ES1 (1 << 1)
#define CK_3430ES2 (1 << 2)
static struct omap_clk omap34xx_clks[] = {
CLK(NULL, "omap_32k_fck", &omap_32k_fck, CK_343X),
CLK(NULL, "virt_12m_ck", &virt_12m_ck, CK_343X),
CLK(NULL, "virt_13m_ck", &virt_13m_ck, CK_343X),
CLK(NULL, "virt_16_8m_ck", &virt_16_8m_ck, CK_3430ES2),
CLK(NULL, "virt_19_2m_ck", &virt_19_2m_ck, CK_343X),
CLK(NULL, "virt_26m_ck", &virt_26m_ck, CK_343X),
CLK(NULL, "virt_38_4m_ck", &virt_38_4m_ck, CK_343X),
CLK(NULL, "osc_sys_ck", &osc_sys_ck, CK_343X),
CLK(NULL, "sys_ck", &sys_ck, CK_343X),
CLK(NULL, "sys_altclk", &sys_altclk, CK_343X),
CLK(NULL, "mcbsp_clks", &mcbsp_clks, CK_343X),
CLK(NULL, "sys_clkout1", &sys_clkout1, CK_343X),
CLK(NULL, "dpll1_ck", &dpll1_ck, CK_343X),
CLK(NULL, "dpll1_x2_ck", &dpll1_x2_ck, CK_343X),
CLK(NULL, "dpll1_x2m2_ck", &dpll1_x2m2_ck, CK_343X),
CLK(NULL, "dpll2_ck", &dpll2_ck, CK_343X),
CLK(NULL, "dpll2_m2_ck", &dpll2_m2_ck, CK_343X),
CLK(NULL, "dpll3_ck", &dpll3_ck, CK_343X),
CLK(NULL, "core_ck", &core_ck, CK_343X),
CLK(NULL, "dpll3_x2_ck", &dpll3_x2_ck, CK_343X),
CLK(NULL, "dpll3_m2_ck", &dpll3_m2_ck, CK_343X),
CLK(NULL, "dpll3_m2x2_ck", &dpll3_m2x2_ck, CK_343X),
CLK(NULL, "dpll3_m3_ck", &dpll3_m3_ck, CK_343X),
CLK(NULL, "dpll3_m3x2_ck", &dpll3_m3x2_ck, CK_343X),
CLK(NULL, "emu_core_alwon_ck", &emu_core_alwon_ck, CK_343X),
CLK(NULL, "dpll4_ck", &dpll4_ck, CK_343X),
CLK(NULL, "dpll4_x2_ck", &dpll4_x2_ck, CK_343X),
CLK(NULL, "omap_96m_alwon_fck", &omap_96m_alwon_fck, CK_343X),
CLK(NULL, "omap_96m_fck", &omap_96m_fck, CK_343X),
CLK(NULL, "cm_96m_fck", &cm_96m_fck, CK_343X),
CLK(NULL, "omap_54m_fck", &omap_54m_fck, CK_343X),
CLK(NULL, "omap_48m_fck", &omap_48m_fck, CK_343X),
CLK(NULL, "omap_12m_fck", &omap_12m_fck, CK_343X),
CLK(NULL, "dpll4_m2_ck", &dpll4_m2_ck, CK_343X),
CLK(NULL, "dpll4_m2x2_ck", &dpll4_m2x2_ck, CK_343X),
CLK(NULL, "dpll4_m3_ck", &dpll4_m3_ck, CK_343X),
CLK(NULL, "dpll4_m3x2_ck", &dpll4_m3x2_ck, CK_343X),
CLK(NULL, "dpll4_m4_ck", &dpll4_m4_ck, CK_343X),
CLK(NULL, "dpll4_m4x2_ck", &dpll4_m4x2_ck, CK_343X),
CLK(NULL, "dpll4_m5_ck", &dpll4_m5_ck, CK_343X),
CLK(NULL, "dpll4_m5x2_ck", &dpll4_m5x2_ck, CK_343X),
CLK(NULL, "dpll4_m6_ck", &dpll4_m6_ck, CK_343X),
CLK(NULL, "dpll4_m6x2_ck", &dpll4_m6x2_ck, CK_343X),
CLK(NULL, "emu_per_alwon_ck", &emu_per_alwon_ck, CK_343X),
CLK(NULL, "dpll5_ck", &dpll5_ck, CK_3430ES2),
CLK(NULL, "dpll5_m2_ck", &dpll5_m2_ck, CK_3430ES2),
CLK(NULL, "clkout2_src_ck", &clkout2_src_ck, CK_343X),
CLK(NULL, "sys_clkout2", &sys_clkout2, CK_343X),
CLK(NULL, "corex2_fck", &corex2_fck, CK_343X),
CLK(NULL, "dpll1_fck", &dpll1_fck, CK_343X),
CLK(NULL, "mpu_ck", &mpu_ck, CK_343X),
CLK(NULL, "arm_fck", &arm_fck, CK_343X),
CLK(NULL, "emu_mpu_alwon_ck", &emu_mpu_alwon_ck, CK_343X),
CLK(NULL, "dpll2_fck", &dpll2_fck, CK_343X),
CLK(NULL, "iva2_ck", &iva2_ck, CK_343X),
CLK(NULL, "l3_ick", &l3_ick, CK_343X),
CLK(NULL, "l4_ick", &l4_ick, CK_343X),
CLK(NULL, "rm_ick", &rm_ick, CK_343X),
CLK(NULL, "gfx_l3_ck", &gfx_l3_ck, CK_3430ES1),
CLK(NULL, "gfx_l3_fck", &gfx_l3_fck, CK_3430ES1),
CLK(NULL, "gfx_l3_ick", &gfx_l3_ick, CK_3430ES1),
CLK(NULL, "gfx_cg1_ck", &gfx_cg1_ck, CK_3430ES1),
CLK(NULL, "gfx_cg2_ck", &gfx_cg2_ck, CK_3430ES1),
CLK(NULL, "sgx_fck", &sgx_fck, CK_3430ES2),
CLK(NULL, "sgx_ick", &sgx_ick, CK_3430ES2),
CLK(NULL, "d2d_26m_fck", &d2d_26m_fck, CK_3430ES1),
CLK(NULL, "modem_fck", &modem_fck, CK_343X),
CLK(NULL, "sad2d_ick", &sad2d_ick, CK_343X),
CLK(NULL, "mad2d_ick", &mad2d_ick, CK_343X),
CLK(NULL, "gpt10_fck", &gpt10_fck, CK_343X),
CLK(NULL, "gpt11_fck", &gpt11_fck, CK_343X),
CLK(NULL, "cpefuse_fck", &cpefuse_fck, CK_3430ES2),
CLK(NULL, "ts_fck", &ts_fck, CK_3430ES2),
CLK(NULL, "usbtll_fck", &usbtll_fck, CK_3430ES2),
CLK(NULL, "core_96m_fck", &core_96m_fck, CK_343X),
CLK("mmci-omap-hs.2", "fck", &mmchs3_fck, CK_3430ES2),
CLK("mmci-omap-hs.1", "fck", &mmchs2_fck, CK_343X),
CLK(NULL, "mspro_fck", &mspro_fck, CK_343X),
CLK("mmci-omap-hs.0", "fck", &mmchs1_fck, CK_343X),
CLK("i2c_omap.3", "fck", &i2c3_fck, CK_343X),
CLK("i2c_omap.2", "fck", &i2c2_fck, CK_343X),
CLK("i2c_omap.1", "fck", &i2c1_fck, CK_343X),
CLK("omap-mcbsp.5", "fck", &mcbsp5_fck, CK_343X),
CLK("omap-mcbsp.1", "fck", &mcbsp1_fck, CK_343X),
CLK(NULL, "core_48m_fck", &core_48m_fck, CK_343X),
CLK("omap2_mcspi.4", "fck", &mcspi4_fck, CK_343X),
CLK("omap2_mcspi.3", "fck", &mcspi3_fck, CK_343X),
CLK("omap2_mcspi.2", "fck", &mcspi2_fck, CK_343X),
CLK("omap2_mcspi.1", "fck", &mcspi1_fck, CK_343X),
CLK(NULL, "uart2_fck", &uart2_fck, CK_343X),
CLK(NULL, "uart1_fck", &uart1_fck, CK_343X),
CLK(NULL, "fshostusb_fck", &fshostusb_fck, CK_3430ES1),
CLK(NULL, "core_12m_fck", &core_12m_fck, CK_343X),
CLK("omap_hdq.0", "fck", &hdq_fck, CK_343X),
CLK(NULL, "ssi_ssr_fck", &ssi_ssr_fck, CK_343X),
CLK(NULL, "ssi_sst_fck", &ssi_sst_fck, CK_343X),
CLK(NULL, "core_l3_ick", &core_l3_ick, CK_343X),
CLK("musb_hdrc", "ick", &hsotgusb_ick, CK_343X),
CLK(NULL, "sdrc_ick", &sdrc_ick, CK_343X),
CLK(NULL, "gpmc_fck", &gpmc_fck, CK_343X),
CLK(NULL, "security_l3_ick", &security_l3_ick, CK_343X),
CLK(NULL, "pka_ick", &pka_ick, CK_343X),
CLK(NULL, "core_l4_ick", &core_l4_ick, CK_343X),
CLK(NULL, "usbtll_ick", &usbtll_ick, CK_3430ES2),
CLK("mmci-omap-hs.2", "ick", &mmchs3_ick, CK_3430ES2),
CLK(NULL, "icr_ick", &icr_ick, CK_343X),
CLK(NULL, "aes2_ick", &aes2_ick, CK_343X),
CLK(NULL, "sha12_ick", &sha12_ick, CK_343X),
CLK(NULL, "des2_ick", &des2_ick, CK_343X),
CLK("mmci-omap-hs.1", "ick", &mmchs2_ick, CK_343X),
CLK("mmci-omap-hs.0", "ick", &mmchs1_ick, CK_343X),
CLK(NULL, "mspro_ick", &mspro_ick, CK_343X),
CLK("omap_hdq.0", "ick", &hdq_ick, CK_343X),
CLK("omap2_mcspi.4", "ick", &mcspi4_ick, CK_343X),
CLK("omap2_mcspi.3", "ick", &mcspi3_ick, CK_343X),
CLK("omap2_mcspi.2", "ick", &mcspi2_ick, CK_343X),
CLK("omap2_mcspi.1", "ick", &mcspi1_ick, CK_343X),
CLK("i2c_omap.3", "ick", &i2c3_ick, CK_343X),
CLK("i2c_omap.2", "ick", &i2c2_ick, CK_343X),
CLK("i2c_omap.1", "ick", &i2c1_ick, CK_343X),
CLK(NULL, "uart2_ick", &uart2_ick, CK_343X),
CLK(NULL, "uart1_ick", &uart1_ick, CK_343X),
CLK(NULL, "gpt11_ick", &gpt11_ick, CK_343X),
CLK(NULL, "gpt10_ick", &gpt10_ick, CK_343X),
CLK("omap-mcbsp.5", "ick", &mcbsp5_ick, CK_343X),
CLK("omap-mcbsp.1", "ick", &mcbsp1_ick, CK_343X),
CLK(NULL, "fac_ick", &fac_ick, CK_3430ES1),
CLK(NULL, "mailboxes_ick", &mailboxes_ick, CK_343X),
CLK(NULL, "omapctrl_ick", &omapctrl_ick, CK_343X),
CLK(NULL, "ssi_l4_ick", &ssi_l4_ick, CK_343X),
CLK(NULL, "ssi_ick", &ssi_ick, CK_343X),
CLK(NULL, "usb_l4_ick", &usb_l4_ick, CK_3430ES1),
CLK(NULL, "security_l4_ick2", &security_l4_ick2, CK_343X),
CLK(NULL, "aes1_ick", &aes1_ick, CK_343X),
CLK("omap_rng", "ick", &rng_ick, CK_343X),
CLK(NULL, "sha11_ick", &sha11_ick, CK_343X),
CLK(NULL, "des1_ick", &des1_ick, CK_343X),
CLK("omapfb", "dss1_fck", &dss1_alwon_fck, CK_343X),
CLK("omapfb", "tv_fck", &dss_tv_fck, CK_343X),
CLK("omapfb", "video_fck", &dss_96m_fck, CK_343X),
CLK("omapfb", "dss2_fck", &dss2_alwon_fck, CK_343X),
CLK("omapfb", "ick", &dss_ick, CK_343X),
CLK(NULL, "cam_mclk", &cam_mclk, CK_343X),
CLK(NULL, "cam_ick", &cam_ick, CK_343X),
CLK(NULL, "csi2_96m_fck", &csi2_96m_fck, CK_343X),
CLK(NULL, "usbhost_120m_fck", &usbhost_120m_fck, CK_3430ES2),
CLK(NULL, "usbhost_48m_fck", &usbhost_48m_fck, CK_3430ES2),
CLK(NULL, "usbhost_ick", &usbhost_ick, CK_3430ES2),
CLK(NULL, "usim_fck", &usim_fck, CK_3430ES2),
CLK(NULL, "gpt1_fck", &gpt1_fck, CK_343X),
CLK(NULL, "wkup_32k_fck", &wkup_32k_fck, CK_343X),
CLK(NULL, "gpio1_dbck", &gpio1_dbck, CK_343X),
CLK("omap_wdt", "fck", &wdt2_fck, CK_343X),
CLK(NULL, "wkup_l4_ick", &wkup_l4_ick, CK_343X),
CLK(NULL, "usim_ick", &usim_ick, CK_3430ES2),
CLK("omap_wdt", "ick", &wdt2_ick, CK_343X),
CLK(NULL, "wdt1_ick", &wdt1_ick, CK_343X),
CLK(NULL, "gpio1_ick", &gpio1_ick, CK_343X),
CLK(NULL, "omap_32ksync_ick", &omap_32ksync_ick, CK_343X),
CLK(NULL, "gpt12_ick", &gpt12_ick, CK_343X),
CLK(NULL, "gpt1_ick", &gpt1_ick, CK_343X),
CLK(NULL, "per_96m_fck", &per_96m_fck, CK_343X),
CLK(NULL, "per_48m_fck", &per_48m_fck, CK_343X),
CLK(NULL, "uart3_fck", &uart3_fck, CK_343X),
CLK(NULL, "gpt2_fck", &gpt2_fck, CK_343X),
CLK(NULL, "gpt3_fck", &gpt3_fck, CK_343X),
CLK(NULL, "gpt4_fck", &gpt4_fck, CK_343X),
CLK(NULL, "gpt5_fck", &gpt5_fck, CK_343X),
CLK(NULL, "gpt6_fck", &gpt6_fck, CK_343X),
CLK(NULL, "gpt7_fck", &gpt7_fck, CK_343X),
CLK(NULL, "gpt8_fck", &gpt8_fck, CK_343X),
CLK(NULL, "gpt9_fck", &gpt9_fck, CK_343X),
CLK(NULL, "per_32k_alwon_fck", &per_32k_alwon_fck, CK_343X),
CLK(NULL, "gpio6_dbck", &gpio6_dbck, CK_343X),
CLK(NULL, "gpio5_dbck", &gpio5_dbck, CK_343X),
CLK(NULL, "gpio4_dbck", &gpio4_dbck, CK_343X),
CLK(NULL, "gpio3_dbck", &gpio3_dbck, CK_343X),
CLK(NULL, "gpio2_dbck", &gpio2_dbck, CK_343X),
CLK(NULL, "wdt3_fck", &wdt3_fck, CK_343X),
CLK(NULL, "per_l4_ick", &per_l4_ick, CK_343X),
CLK(NULL, "gpio6_ick", &gpio6_ick, CK_343X),
CLK(NULL, "gpio5_ick", &gpio5_ick, CK_343X),
CLK(NULL, "gpio4_ick", &gpio4_ick, CK_343X),
CLK(NULL, "gpio3_ick", &gpio3_ick, CK_343X),
CLK(NULL, "gpio2_ick", &gpio2_ick, CK_343X),
CLK(NULL, "wdt3_ick", &wdt3_ick, CK_343X),
CLK(NULL, "uart3_ick", &uart3_ick, CK_343X),
CLK(NULL, "gpt9_ick", &gpt9_ick, CK_343X),
CLK(NULL, "gpt8_ick", &gpt8_ick, CK_343X),
CLK(NULL, "gpt7_ick", &gpt7_ick, CK_343X),
CLK(NULL, "gpt6_ick", &gpt6_ick, CK_343X),
CLK(NULL, "gpt5_ick", &gpt5_ick, CK_343X),
CLK(NULL, "gpt4_ick", &gpt4_ick, CK_343X),
CLK(NULL, "gpt3_ick", &gpt3_ick, CK_343X),
CLK(NULL, "gpt2_ick", &gpt2_ick, CK_343X),
CLK("omap-mcbsp.2", "ick", &mcbsp2_ick, CK_343X),
CLK("omap-mcbsp.3", "ick", &mcbsp3_ick, CK_343X),
CLK("omap-mcbsp.4", "ick", &mcbsp4_ick, CK_343X),
CLK("omap-mcbsp.2", "fck", &mcbsp2_fck, CK_343X),
CLK("omap-mcbsp.3", "fck", &mcbsp3_fck, CK_343X),
CLK("omap-mcbsp.4", "fck", &mcbsp4_fck, CK_343X),
CLK(NULL, "emu_src_ck", &emu_src_ck, CK_343X),
CLK(NULL, "pclk_fck", &pclk_fck, CK_343X),
CLK(NULL, "pclkx2_fck", &pclkx2_fck, CK_343X),
CLK(NULL, "atclk_fck", &atclk_fck, CK_343X),
CLK(NULL, "traceclk_src_fck", &traceclk_src_fck, CK_343X),
CLK(NULL, "traceclk_fck", &traceclk_fck, CK_343X),
CLK(NULL, "sr1_fck", &sr1_fck, CK_343X),
CLK(NULL, "sr2_fck", &sr2_fck, CK_343X),
CLK(NULL, "sr_l4_ick", &sr_l4_ick, CK_343X),
CLK(NULL, "secure_32k_fck", &secure_32k_fck, CK_343X),
CLK(NULL, "gpt12_fck", &gpt12_fck, CK_343X),
CLK(NULL, "wdt1_fck", &wdt1_fck, CK_343X),
};
/* CM_AUTOIDLE_PLL*.AUTO_* bit values */
#define DPLL_AUTOIDLE_DISABLE 0x0
#define DPLL_AUTOIDLE_LOW_POWER_STOP 0x1
#define MAX_DPLL_WAIT_TRIES 1000000
#define MIN_SDRC_DLL_LOCK_FREQ 83000000
#define CYCLES_PER_MHZ 1000000
/* Scale factor for fixed-point arith in omap3_core_dpll_m2_set_rate() */
#define SDRC_MPURATE_SCALE 8
/* 2^SDRC_MPURATE_BASE_SHIFT: MPU MHz that SDRC_MPURATE_LOOPS is defined for */
#define SDRC_MPURATE_BASE_SHIFT 9
/*
* SDRC_MPURATE_LOOPS: Number of MPU loops to execute at
* 2^MPURATE_BASE_SHIFT MHz for SDRC to stabilize
*/
#define SDRC_MPURATE_LOOPS 96
/**
* omap3_dpll_recalc - recalculate DPLL rate
* @clk: DPLL struct clk
*
* Recalculate and propagate the DPLL rate.
*/
static unsigned long omap3_dpll_recalc(struct clk *clk)
{
return omap2_get_dpll_rate(clk);
}
/* _omap3_dpll_write_clken - write clken_bits arg to a DPLL's enable bits */
static void _omap3_dpll_write_clken(struct clk *clk, u8 clken_bits)
{
const struct dpll_data *dd;
u32 v;
dd = clk->dpll_data;
v = __raw_readl(dd->control_reg);
v &= ~dd->enable_mask;
v |= clken_bits << __ffs(dd->enable_mask);
__raw_writel(v, dd->control_reg);
}
/* _omap3_wait_dpll_status: wait for a DPLL to enter a specific state */
static int _omap3_wait_dpll_status(struct clk *clk, u8 state)
{
const struct dpll_data *dd;
int i = 0;
int ret = -EINVAL;
dd = clk->dpll_data;
state <<= __ffs(dd->idlest_mask);
while (((__raw_readl(dd->idlest_reg) & dd->idlest_mask) != state) &&
i < MAX_DPLL_WAIT_TRIES) {
i++;
udelay(1);
}
if (i == MAX_DPLL_WAIT_TRIES) {
printk(KERN_ERR "clock: %s failed transition to '%s'\n",
clk->name, (state) ? "locked" : "bypassed");
} else {
pr_debug("clock: %s transition to '%s' in %d loops\n",
clk->name, (state) ? "locked" : "bypassed", i);
ret = 0;
}
return ret;
}
/* From 3430 TRM ES2 4.7.6.2 */
static u16 _omap3_dpll_compute_freqsel(struct clk *clk, u8 n)
{
unsigned long fint;
u16 f = 0;
fint = clk->dpll_data->clk_ref->rate / (n + 1);
pr_debug("clock: fint is %lu\n", fint);
if (fint >= 750000 && fint <= 1000000)
f = 0x3;
else if (fint > 1000000 && fint <= 1250000)
f = 0x4;
else if (fint > 1250000 && fint <= 1500000)
f = 0x5;
else if (fint > 1500000 && fint <= 1750000)
f = 0x6;
else if (fint > 1750000 && fint <= 2100000)
f = 0x7;
else if (fint > 7500000 && fint <= 10000000)
f = 0xB;
else if (fint > 10000000 && fint <= 12500000)
f = 0xC;
else if (fint > 12500000 && fint <= 15000000)
f = 0xD;
else if (fint > 15000000 && fint <= 17500000)
f = 0xE;
else if (fint > 17500000 && fint <= 21000000)
f = 0xF;
else
pr_debug("clock: unknown freqsel setting for %d\n", n);
return f;
}
/* Non-CORE DPLL (e.g., DPLLs that do not control SDRC) clock functions */
/*
* _omap3_noncore_dpll_lock - instruct a DPLL to lock and wait for readiness
* @clk: pointer to a DPLL struct clk
*
* Instructs a non-CORE DPLL to lock. Waits for the DPLL to report
* readiness before returning. Will save and restore the DPLL's
* autoidle state across the enable, per the CDP code. If the DPLL
* locked successfully, return 0; if the DPLL did not lock in the time
* allotted, or DPLL3 was passed in, return -EINVAL.
*/
static int _omap3_noncore_dpll_lock(struct clk *clk)
{
u8 ai;
int r;
if (clk == &dpll3_ck)
return -EINVAL;
pr_debug("clock: locking DPLL %s\n", clk->name);
ai = omap3_dpll_autoidle_read(clk);
omap3_dpll_deny_idle(clk);
_omap3_dpll_write_clken(clk, DPLL_LOCKED);
r = _omap3_wait_dpll_status(clk, 1);
if (ai)
omap3_dpll_allow_idle(clk);
return r;
}
/*
* _omap3_noncore_dpll_bypass - instruct a DPLL to bypass and wait for readiness
* @clk: pointer to a DPLL struct clk
*
* Instructs a non-CORE DPLL to enter low-power bypass mode. In
* bypass mode, the DPLL's rate is set equal to its parent clock's
* rate. Waits for the DPLL to report readiness before returning.
* Will save and restore the DPLL's autoidle state across the enable,
* per the CDP code. If the DPLL entered bypass mode successfully,
* return 0; if the DPLL did not enter bypass in the time allotted, or
* DPLL3 was passed in, or the DPLL does not support low-power bypass,
* return -EINVAL.
*/
static int _omap3_noncore_dpll_bypass(struct clk *clk)
{
int r;
u8 ai;
if (clk == &dpll3_ck)
return -EINVAL;
if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS)))
return -EINVAL;
pr_debug("clock: configuring DPLL %s for low-power bypass\n",
clk->name);
ai = omap3_dpll_autoidle_read(clk);
_omap3_dpll_write_clken(clk, DPLL_LOW_POWER_BYPASS);
r = _omap3_wait_dpll_status(clk, 0);
if (ai)
omap3_dpll_allow_idle(clk);
else
omap3_dpll_deny_idle(clk);
return r;
}
/*
* _omap3_noncore_dpll_stop - instruct a DPLL to stop
* @clk: pointer to a DPLL struct clk
*
* Instructs a non-CORE DPLL to enter low-power stop. Will save and
* restore the DPLL's autoidle state across the stop, per the CDP
* code. If DPLL3 was passed in, or the DPLL does not support
* low-power stop, return -EINVAL; otherwise, return 0.
*/
static int _omap3_noncore_dpll_stop(struct clk *clk)
{
u8 ai;
if (clk == &dpll3_ck)
return -EINVAL;
if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_STOP)))
return -EINVAL;
pr_debug("clock: stopping DPLL %s\n", clk->name);
ai = omap3_dpll_autoidle_read(clk);
_omap3_dpll_write_clken(clk, DPLL_LOW_POWER_STOP);
if (ai)
omap3_dpll_allow_idle(clk);
else
omap3_dpll_deny_idle(clk);
return 0;
}
/**
* omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode
* @clk: pointer to a DPLL struct clk
*
* Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock.
* The choice of modes depends on the DPLL's programmed rate: if it is
* the same as the DPLL's parent clock, it will enter bypass;
* otherwise, it will enter lock. This code will wait for the DPLL to
* indicate readiness before returning, unless the DPLL takes too long
* to enter the target state. Intended to be used as the struct clk's
* enable function. If DPLL3 was passed in, or the DPLL does not
* support low-power stop, or if the DPLL took too long to enter
* bypass or lock, return -EINVAL; otherwise, return 0.
*/
static int omap3_noncore_dpll_enable(struct clk *clk)
{
int r;
struct dpll_data *dd;
if (clk == &dpll3_ck)
return -EINVAL;
dd = clk->dpll_data;
if (!dd)
return -EINVAL;
if (clk->rate == dd->clk_bypass->rate) {
WARN_ON(clk->parent != dd->clk_bypass);
r = _omap3_noncore_dpll_bypass(clk);
} else {
WARN_ON(clk->parent != dd->clk_ref);
r = _omap3_noncore_dpll_lock(clk);
}
/* FIXME: this is dubious - if clk->rate has changed, what about propagating? */
if (!r)
clk->rate = omap2_get_dpll_rate(clk);
return r;
}
/**
* omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode
* @clk: pointer to a DPLL struct clk
*
* Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock.
* The choice of modes depends on the DPLL's programmed rate: if it is
* the same as the DPLL's parent clock, it will enter bypass;
* otherwise, it will enter lock. This code will wait for the DPLL to
* indicate readiness before returning, unless the DPLL takes too long
* to enter the target state. Intended to be used as the struct clk's
* enable function. If DPLL3 was passed in, or the DPLL does not
* support low-power stop, or if the DPLL took too long to enter
* bypass or lock, return -EINVAL; otherwise, return 0.
*/
static void omap3_noncore_dpll_disable(struct clk *clk)
{
if (clk == &dpll3_ck)
return;
_omap3_noncore_dpll_stop(clk);
}
/* Non-CORE DPLL rate set code */
/*
* omap3_noncore_dpll_program - set non-core DPLL M,N values directly
* @clk: struct clk * of DPLL to set
* @m: DPLL multiplier to set
* @n: DPLL divider to set
* @freqsel: FREQSEL value to set
*
* Program the DPLL with the supplied M, N values, and wait for the DPLL to
* lock.. Returns -EINVAL upon error, or 0 upon success.
*/
static int omap3_noncore_dpll_program(struct clk *clk, u16 m, u8 n, u16 freqsel)
{
struct dpll_data *dd = clk->dpll_data;
u32 v;
/* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */
_omap3_noncore_dpll_bypass(clk);
/* Set jitter correction */
v = __raw_readl(dd->control_reg);
v &= ~dd->freqsel_mask;
v |= freqsel << __ffs(dd->freqsel_mask);
__raw_writel(v, dd->control_reg);
/* Set DPLL multiplier, divider */
v = __raw_readl(dd->mult_div1_reg);
v &= ~(dd->mult_mask | dd->div1_mask);
v |= m << __ffs(dd->mult_mask);
v |= (n - 1) << __ffs(dd->div1_mask);
__raw_writel(v, dd->mult_div1_reg);
/* We let the clock framework set the other output dividers later */
/* REVISIT: Set ramp-up delay? */
_omap3_noncore_dpll_lock(clk);
return 0;
}
/**
* omap3_noncore_dpll_set_rate - set non-core DPLL rate
* @clk: struct clk * of DPLL to set
* @rate: rounded target rate
*
* Set the DPLL CLKOUT to the target rate. If the DPLL can enter
* low-power bypass, and the target rate is the bypass source clock
* rate, then configure the DPLL for bypass. Otherwise, round the
* target rate if it hasn't been done already, then program and lock
* the DPLL. Returns -EINVAL upon error, or 0 upon success.
*/
static int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate)
{
struct clk *new_parent = NULL;
u16 freqsel;
struct dpll_data *dd;
int ret;
if (!clk || !rate)
return -EINVAL;
dd = clk->dpll_data;
if (!dd)
return -EINVAL;
if (rate == omap2_get_dpll_rate(clk))
return 0;
/*
* Ensure both the bypass and ref clocks are enabled prior to
* doing anything; we need the bypass clock running to reprogram
* the DPLL.
*/
omap2_clk_enable(dd->clk_bypass);
omap2_clk_enable(dd->clk_ref);
if (dd->clk_bypass->rate == rate &&
(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
pr_debug("clock: %s: set rate: entering bypass.\n", clk->name);
ret = _omap3_noncore_dpll_bypass(clk);
if (!ret)
new_parent = dd->clk_bypass;
} else {
if (dd->last_rounded_rate != rate)
omap2_dpll_round_rate(clk, rate);
if (dd->last_rounded_rate == 0)
return -EINVAL;
freqsel = _omap3_dpll_compute_freqsel(clk, dd->last_rounded_n);
if (!freqsel)
WARN_ON(1);
pr_debug("clock: %s: set rate: locking rate to %lu.\n",
clk->name, rate);
ret = omap3_noncore_dpll_program(clk, dd->last_rounded_m,
dd->last_rounded_n, freqsel);
if (!ret)
new_parent = dd->clk_ref;
}
if (!ret) {
/*
* Switch the parent clock in the heirarchy, and make sure
* that the new parent's usecount is correct. Note: we
* enable the new parent before disabling the old to avoid
* any unnecessary hardware disable->enable transitions.
*/
if (clk->usecount) {
omap2_clk_enable(new_parent);
omap2_clk_disable(clk->parent);
}
clk_reparent(clk, new_parent);
clk->rate = rate;
}
omap2_clk_disable(dd->clk_ref);
omap2_clk_disable(dd->clk_bypass);
return 0;
}
static int omap3_dpll4_set_rate(struct clk *clk, unsigned long rate)
{
/*
* According to the 12-5 CDP code from TI, "Limitation 2.5"
* on 3430ES1 prevents us from changing DPLL multipliers or dividers
* on DPLL4.
*/
if (omap_rev() == OMAP3430_REV_ES1_0) {
printk(KERN_ERR "clock: DPLL4 cannot change rate due to "
"silicon 'Limitation 2.5' on 3430ES1.\n");
return -EINVAL;
}
return omap3_noncore_dpll_set_rate(clk, rate);
}
/*
* CORE DPLL (DPLL3) rate programming functions
*
* These call into SRAM code to do the actual CM writes, since the SDRAM
* is clocked from DPLL3.
*/
/**
* omap3_core_dpll_m2_set_rate - set CORE DPLL M2 divider
* @clk: struct clk * of DPLL to set
* @rate: rounded target rate
*
* Program the DPLL M2 divider with the rounded target rate. Returns
* -EINVAL upon error, or 0 upon success.
*/
static int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
{
u32 new_div = 0;
u32 unlock_dll = 0;
u32 c;
unsigned long validrate, sdrcrate, mpurate;
struct omap_sdrc_params *sp;
if (!clk || !rate)
return -EINVAL;
if (clk != &dpll3_m2_ck)
return -EINVAL;
validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
if (validrate != rate)
return -EINVAL;
sdrcrate = sdrc_ick.rate;
if (rate > clk->rate)
sdrcrate <<= ((rate / clk->rate) >> 1);
else
sdrcrate >>= ((clk->rate / rate) >> 1);
sp = omap2_sdrc_get_params(sdrcrate);
if (!sp)
return -EINVAL;
if (sdrcrate < MIN_SDRC_DLL_LOCK_FREQ) {
pr_debug("clock: will unlock SDRC DLL\n");
unlock_dll = 1;
}
/*
* XXX This only needs to be done when the CPU frequency changes
*/
mpurate = arm_fck.rate / CYCLES_PER_MHZ;
c = (mpurate << SDRC_MPURATE_SCALE) >> SDRC_MPURATE_BASE_SHIFT;
c += 1; /* for safety */
c *= SDRC_MPURATE_LOOPS;
c >>= SDRC_MPURATE_SCALE;
if (c == 0)
c = 1;
pr_debug("clock: changing CORE DPLL rate from %lu to %lu\n", clk->rate,
validrate);
pr_debug("clock: SDRC timing params used: %08x %08x %08x\n",
sp->rfr_ctrl, sp->actim_ctrla, sp->actim_ctrlb);
omap3_configure_core_dpll(sp->rfr_ctrl, sp->actim_ctrla,
sp->actim_ctrlb, new_div, unlock_dll, c,
sp->mr, rate > clk->rate);
return 0;
}
static const struct clkops clkops_noncore_dpll_ops = {
.enable = &omap3_noncore_dpll_enable,
.disable = &omap3_noncore_dpll_disable,
};
/* DPLL autoidle read/set code */
/**
* omap3_dpll_autoidle_read - read a DPLL's autoidle bits
* @clk: struct clk * of the DPLL to read
*
* Return the DPLL's autoidle bits, shifted down to bit 0. Returns
* -EINVAL if passed a null pointer or if the struct clk does not
* appear to refer to a DPLL.
*/
static u32 omap3_dpll_autoidle_read(struct clk *clk)
{
const struct dpll_data *dd;
u32 v;
if (!clk || !clk->dpll_data)
return -EINVAL;
dd = clk->dpll_data;
v = __raw_readl(dd->autoidle_reg);
v &= dd->autoidle_mask;
v >>= __ffs(dd->autoidle_mask);
return v;
}
/**
* omap3_dpll_allow_idle - enable DPLL autoidle bits
* @clk: struct clk * of the DPLL to operate on
*
* Enable DPLL automatic idle control. This automatic idle mode
* switching takes effect only when the DPLL is locked, at least on
* OMAP3430. The DPLL will enter low-power stop when its downstream
* clocks are gated. No return value.
*/
static void omap3_dpll_allow_idle(struct clk *clk)
{
const struct dpll_data *dd;
u32 v;
if (!clk || !clk->dpll_data)
return;
dd = clk->dpll_data;
/*
* REVISIT: CORE DPLL can optionally enter low-power bypass
* by writing 0x5 instead of 0x1. Add some mechanism to
* optionally enter this mode.
*/
v = __raw_readl(dd->autoidle_reg);
v &= ~dd->autoidle_mask;
v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask);
__raw_writel(v, dd->autoidle_reg);
}
/**
* omap3_dpll_deny_idle - prevent DPLL from automatically idling
* @clk: struct clk * of the DPLL to operate on
*
* Disable DPLL automatic idle control. No return value.
*/
static void omap3_dpll_deny_idle(struct clk *clk)
{
const struct dpll_data *dd;
u32 v;
if (!clk || !clk->dpll_data)
return;
dd = clk->dpll_data;
v = __raw_readl(dd->autoidle_reg);
v &= ~dd->autoidle_mask;
v |= DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask);
__raw_writel(v, dd->autoidle_reg);
}
/* Clock control for DPLL outputs */
/**
* omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate
* @clk: DPLL output struct clk
*
* Using parent clock DPLL data, look up DPLL state. If locked, set our
* rate to the dpll_clk * 2; otherwise, just use dpll_clk.
*/
static unsigned long omap3_clkoutx2_recalc(struct clk *clk)
{
const struct dpll_data *dd;
unsigned long rate;
u32 v;
struct clk *pclk;
/* Walk up the parents of clk, looking for a DPLL */
pclk = clk->parent;
while (pclk && !pclk->dpll_data)
pclk = pclk->parent;
/* clk does not have a DPLL as a parent? */
WARN_ON(!pclk);
dd = pclk->dpll_data;
WARN_ON(!dd->enable_mask);
v = __raw_readl(dd->control_reg) & dd->enable_mask;
v >>= __ffs(dd->enable_mask);
if (v != OMAP3XXX_EN_DPLL_LOCKED)
rate = clk->parent->rate;
else
rate = clk->parent->rate * 2;
return rate;
}
/* Common clock code */
/*
* As it is structured now, this will prevent an OMAP2/3 multiboot
* kernel from compiling. This will need further attention.
*/
#if defined(CONFIG_ARCH_OMAP3)
static struct clk_functions omap2_clk_functions = {
.clk_enable = omap2_clk_enable,
.clk_disable = omap2_clk_disable,
.clk_round_rate = omap2_clk_round_rate,
.clk_set_rate = omap2_clk_set_rate,
.clk_set_parent = omap2_clk_set_parent,
.clk_disable_unused = omap2_clk_disable_unused,
};
/*
* Set clocks for bypass mode for reboot to work.
*/
void omap2_clk_prepare_for_reboot(void)
{
/* REVISIT: Not ready for 343x */
#if 0
u32 rate;
if (vclk == NULL || sclk == NULL)
return;
rate = clk_get_rate(sclk);
clk_set_rate(vclk, rate);
#endif
}
/* REVISIT: Move this init stuff out into clock.c */
/*
* Switch the MPU rate if specified on cmdline.
* We cannot do this early until cmdline is parsed.
*/
static int __init omap2_clk_arch_init(void)
{
if (!mpurate)
return -EINVAL;
/* REVISIT: not yet ready for 343x */
#if 0
if (clk_set_rate(&virt_prcm_set, mpurate))
printk(KERN_ERR "Could not find matching MPU rate\n");
#endif
recalculate_root_clocks();
printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL3/MPU): "
"%ld.%01ld/%ld/%ld MHz\n",
(osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
(core_ck.rate / 1000000), (dpll1_fck.rate / 1000000)) ;
return 0;
}
arch_initcall(omap2_clk_arch_init);
int __init omap2_clk_init(void)
{
/* struct prcm_config *prcm; */
struct omap_clk *c;
/* u32 clkrate; */
u32 cpu_clkflg;
if (cpu_is_omap34xx()) {
cpu_mask = RATE_IN_343X;
cpu_clkflg = CK_343X;
/*
* Update this if there are further clock changes between ES2
* and production parts
*/
if (omap_rev() == OMAP3430_REV_ES1_0) {
/* No 3430ES1-only rates exist, so no RATE_IN_3430ES1 */
cpu_clkflg |= CK_3430ES1;
} else {
cpu_mask |= RATE_IN_3430ES2;
cpu_clkflg |= CK_3430ES2;
}
}
clk_init(&omap2_clk_functions);
for (c = omap34xx_clks; c < omap34xx_clks + ARRAY_SIZE(omap34xx_clks); c++)
clk_preinit(c->lk.clk);
for (c = omap34xx_clks; c < omap34xx_clks + ARRAY_SIZE(omap34xx_clks); c++)
if (c->cpu & cpu_clkflg) {
clkdev_add(&c->lk);
clk_register(c->lk.clk);
omap2_init_clk_clkdm(c->lk.clk);
}
/* REVISIT: Not yet ready for OMAP3 */
#if 0
/* Check the MPU rate set by bootloader */
clkrate = omap2_get_dpll_rate_24xx(&dpll_ck);
for (prcm = rate_table; prcm->mpu_speed; prcm++) {
if (!(prcm->flags & cpu_mask))
continue;
if (prcm->xtal_speed != sys_ck.rate)
continue;
if (prcm->dpll_speed <= clkrate)
break;
}
curr_prcm_set = prcm;
#endif
recalculate_root_clocks();
printk(KERN_INFO "Clocking rate (Crystal/DPLL/ARM core): "
"%ld.%01ld/%ld/%ld MHz\n",
(osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
(core_ck.rate / 1000000), (arm_fck.rate / 1000000));
/*
* Only enable those clocks we will need, let the drivers
* enable other clocks as necessary
*/
clk_enable_init_clocks();
/* Avoid sleeping during omap2_clk_prepare_for_reboot() */
/* REVISIT: not yet ready for 343x */
#if 0
vclk = clk_get(NULL, "virt_prcm_set");
sclk = clk_get(NULL, "sys_ck");
#endif
return 0;
}
#endif
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