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linux/arch/arm/mach-omap2/clock24xx.c
Russell King c0bf31320d [ARM] omap: add support for bypassing DPLLs 
This roughly corresponds with OMAP commits: 7d06c48, 3241b19,
88b5d9b, 18a5500, 9c909ac, 5c6497b, 8b1f0bd, 2ac1da8.

For both OMAP2 and OMAP3, we note the reference and bypass clocks in
the DPLL data structure.  Whenever we modify the DPLL rate, we first
ensure that both the reference and bypass clocks are enabled.  Then,
we decide whether to use the reference and DPLL, or the bypass clock
if the desired rate is identical to the bypass rate, and program the
DPLL appropriately.  Finally, we update the clock's parent, and then
disable the unused clocks.

This keeps the parents correctly balanced, and more importantly ensures
that the bypass clock is running whenever we reprogram the DPLL.  This
is especially important because the procedure for reprogramming the DPLL
involves switching to the bypass clock.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-02-19 17:28:30 +00:00

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/*
* linux/arch/arm/mach-omap2/clock.c
*
* Copyright (C) 2005-2008 Texas Instruments, Inc.
* Copyright (C) 2004-2008 Nokia Corporation
*
* Contacts:
* Richard Woodruff <r-woodruff2@ti.com>
* Paul Walmsley
*
* Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
* Gordon McNutt and RidgeRun, Inc.
*
* 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/cpufreq.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-24xx.h"
#include "cm.h"
#include "cm-regbits-24xx.h"
static const struct clkops clkops_oscck;
static const struct clkops clkops_fixed;
#include "clock24xx.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_243X (1 << 0)
#define CK_242X (1 << 1)
static struct omap_clk omap24xx_clks[] = {
/* external root sources */
CLK(NULL, "func_32k_ck", &func_32k_ck, CK_243X | CK_242X),
CLK(NULL, "osc_ck", &osc_ck, CK_243X | CK_242X),
CLK(NULL, "sys_ck", &sys_ck, CK_243X | CK_242X),
CLK(NULL, "alt_ck", &alt_ck, CK_243X | CK_242X),
/* internal analog sources */
CLK(NULL, "dpll_ck", &dpll_ck, CK_243X | CK_242X),
CLK(NULL, "apll96_ck", &apll96_ck, CK_243X | CK_242X),
CLK(NULL, "apll54_ck", &apll54_ck, CK_243X | CK_242X),
/* internal prcm root sources */
CLK(NULL, "func_54m_ck", &func_54m_ck, CK_243X | CK_242X),
CLK(NULL, "core_ck", &core_ck, CK_243X | CK_242X),
CLK(NULL, "func_96m_ck", &func_96m_ck, CK_243X | CK_242X),
CLK(NULL, "func_48m_ck", &func_48m_ck, CK_243X | CK_242X),
CLK(NULL, "func_12m_ck", &func_12m_ck, CK_243X | CK_242X),
CLK(NULL, "ck_wdt1_osc", &wdt1_osc_ck, CK_243X | CK_242X),
CLK(NULL, "sys_clkout_src", &sys_clkout_src, CK_243X | CK_242X),
CLK(NULL, "sys_clkout", &sys_clkout, CK_243X | CK_242X),
CLK(NULL, "sys_clkout2_src", &sys_clkout2_src, CK_242X),
CLK(NULL, "sys_clkout2", &sys_clkout2, CK_242X),
CLK(NULL, "emul_ck", &emul_ck, CK_242X),
/* mpu domain clocks */
CLK(NULL, "mpu_ck", &mpu_ck, CK_243X | CK_242X),
/* dsp domain clocks */
CLK(NULL, "dsp_fck", &dsp_fck, CK_243X | CK_242X),
CLK(NULL, "dsp_irate_ick", &dsp_irate_ick, CK_243X | CK_242X),
CLK(NULL, "dsp_ick", &dsp_ick, CK_242X),
CLK(NULL, "iva2_1_ick", &iva2_1_ick, CK_243X),
CLK(NULL, "iva1_ifck", &iva1_ifck, CK_242X),
CLK(NULL, "iva1_mpu_int_ifck", &iva1_mpu_int_ifck, CK_242X),
/* GFX domain clocks */
CLK(NULL, "gfx_3d_fck", &gfx_3d_fck, CK_243X | CK_242X),
CLK(NULL, "gfx_2d_fck", &gfx_2d_fck, CK_243X | CK_242X),
CLK(NULL, "gfx_ick", &gfx_ick, CK_243X | CK_242X),
/* Modem domain clocks */
CLK(NULL, "mdm_ick", &mdm_ick, CK_243X),
CLK(NULL, "mdm_osc_ck", &mdm_osc_ck, CK_243X),
/* DSS domain clocks */
CLK(NULL, "dss_ick", &dss_ick, CK_243X | CK_242X),
CLK(NULL, "dss1_fck", &dss1_fck, CK_243X | CK_242X),
CLK(NULL, "dss2_fck", &dss2_fck, CK_243X | CK_242X),
CLK(NULL, "dss_54m_fck", &dss_54m_fck, CK_243X | CK_242X),
/* L3 domain clocks */
CLK(NULL, "core_l3_ck", &core_l3_ck, CK_243X | CK_242X),
CLK(NULL, "ssi_fck", &ssi_ssr_sst_fck, CK_243X | CK_242X),
CLK(NULL, "usb_l4_ick", &usb_l4_ick, CK_243X | CK_242X),
/* L4 domain clocks */
CLK(NULL, "l4_ck", &l4_ck, CK_243X | CK_242X),
CLK(NULL, "ssi_l4_ick", &ssi_l4_ick, CK_243X | CK_242X),
/* virtual meta-group clock */
CLK(NULL, "virt_prcm_set", &virt_prcm_set, CK_243X | CK_242X),
/* general l4 interface ck, multi-parent functional clk */
CLK(NULL, "gpt1_ick", &gpt1_ick, CK_243X | CK_242X),
CLK(NULL, "gpt1_fck", &gpt1_fck, CK_243X | CK_242X),
CLK(NULL, "gpt2_ick", &gpt2_ick, CK_243X | CK_242X),
CLK(NULL, "gpt2_fck", &gpt2_fck, CK_243X | CK_242X),
CLK(NULL, "gpt3_ick", &gpt3_ick, CK_243X | CK_242X),
CLK(NULL, "gpt3_fck", &gpt3_fck, CK_243X | CK_242X),
CLK(NULL, "gpt4_ick", &gpt4_ick, CK_243X | CK_242X),
CLK(NULL, "gpt4_fck", &gpt4_fck, CK_243X | CK_242X),
CLK(NULL, "gpt5_ick", &gpt5_ick, CK_243X | CK_242X),
CLK(NULL, "gpt5_fck", &gpt5_fck, CK_243X | CK_242X),
CLK(NULL, "gpt6_ick", &gpt6_ick, CK_243X | CK_242X),
CLK(NULL, "gpt6_fck", &gpt6_fck, CK_243X | CK_242X),
CLK(NULL, "gpt7_ick", &gpt7_ick, CK_243X | CK_242X),
CLK(NULL, "gpt7_fck", &gpt7_fck, CK_243X | CK_242X),
CLK(NULL, "gpt8_ick", &gpt8_ick, CK_243X | CK_242X),
CLK(NULL, "gpt8_fck", &gpt8_fck, CK_243X | CK_242X),
CLK(NULL, "gpt9_ick", &gpt9_ick, CK_243X | CK_242X),
CLK(NULL, "gpt9_fck", &gpt9_fck, CK_243X | CK_242X),
CLK(NULL, "gpt10_ick", &gpt10_ick, CK_243X | CK_242X),
CLK(NULL, "gpt10_fck", &gpt10_fck, CK_243X | CK_242X),
CLK(NULL, "gpt11_ick", &gpt11_ick, CK_243X | CK_242X),
CLK(NULL, "gpt11_fck", &gpt11_fck, CK_243X | CK_242X),
CLK(NULL, "gpt12_ick", &gpt12_ick, CK_243X | CK_242X),
CLK(NULL, "gpt12_fck", &gpt12_fck, CK_243X | CK_242X),
CLK("omap-mcbsp.1", "ick", &mcbsp1_ick, CK_243X | CK_242X),
CLK("omap-mcbsp.1", "fck", &mcbsp1_fck, CK_243X | CK_242X),
CLK("omap-mcbsp.2", "ick", &mcbsp2_ick, CK_243X | CK_242X),
CLK("omap-mcbsp.2", "fck", &mcbsp2_fck, CK_243X | CK_242X),
CLK("omap-mcbsp.3", "ick", &mcbsp3_ick, CK_243X),
CLK("omap-mcbsp.3", "fck", &mcbsp3_fck, CK_243X),
CLK("omap-mcbsp.4", "ick", &mcbsp4_ick, CK_243X),
CLK("omap-mcbsp.4", "fck", &mcbsp4_fck, CK_243X),
CLK("omap-mcbsp.5", "ick", &mcbsp5_ick, CK_243X),
CLK("omap-mcbsp.5", "fck", &mcbsp5_fck, CK_243X),
CLK("omap2_mcspi.1", "ick", &mcspi1_ick, CK_243X | CK_242X),
CLK("omap2_mcspi.1", "fck", &mcspi1_fck, CK_243X | CK_242X),
CLK("omap2_mcspi.2", "ick", &mcspi2_ick, CK_243X | CK_242X),
CLK("omap2_mcspi.2", "fck", &mcspi2_fck, CK_243X | CK_242X),
CLK("omap2_mcspi.3", "ick", &mcspi3_ick, CK_243X),
CLK("omap2_mcspi.3", "fck", &mcspi3_fck, CK_243X),
CLK(NULL, "uart1_ick", &uart1_ick, CK_243X | CK_242X),
CLK(NULL, "uart1_fck", &uart1_fck, CK_243X | CK_242X),
CLK(NULL, "uart2_ick", &uart2_ick, CK_243X | CK_242X),
CLK(NULL, "uart2_fck", &uart2_fck, CK_243X | CK_242X),
CLK(NULL, "uart3_ick", &uart3_ick, CK_243X | CK_242X),
CLK(NULL, "uart3_fck", &uart3_fck, CK_243X | CK_242X),
CLK(NULL, "gpios_ick", &gpios_ick, CK_243X | CK_242X),
CLK(NULL, "gpios_fck", &gpios_fck, CK_243X | CK_242X),
CLK("omap_wdt", "ick", &mpu_wdt_ick, CK_243X | CK_242X),
CLK("omap_wdt", "fck", &mpu_wdt_fck, CK_243X | CK_242X),
CLK(NULL, "sync_32k_ick", &sync_32k_ick, CK_243X | CK_242X),
CLK(NULL, "wdt1_ick", &wdt1_ick, CK_243X | CK_242X),
CLK(NULL, "omapctrl_ick", &omapctrl_ick, CK_243X | CK_242X),
CLK(NULL, "icr_ick", &icr_ick, CK_243X),
CLK("omap24xxcam", "fck", &cam_fck, CK_243X | CK_242X),
CLK("omap24xxcam", "ick", &cam_ick, CK_243X | CK_242X),
CLK(NULL, "mailboxes_ick", &mailboxes_ick, CK_243X | CK_242X),
CLK(NULL, "wdt4_ick", &wdt4_ick, CK_243X | CK_242X),
CLK(NULL, "wdt4_fck", &wdt4_fck, CK_243X | CK_242X),
CLK(NULL, "wdt3_ick", &wdt3_ick, CK_242X),
CLK(NULL, "wdt3_fck", &wdt3_fck, CK_242X),
CLK(NULL, "mspro_ick", &mspro_ick, CK_243X | CK_242X),
CLK(NULL, "mspro_fck", &mspro_fck, CK_243X | CK_242X),
CLK("mmci-omap.0", "ick", &mmc_ick, CK_242X),
CLK("mmci-omap.0", "fck", &mmc_fck, CK_242X),
CLK(NULL, "fac_ick", &fac_ick, CK_243X | CK_242X),
CLK(NULL, "fac_fck", &fac_fck, CK_243X | CK_242X),
CLK(NULL, "eac_ick", &eac_ick, CK_242X),
CLK(NULL, "eac_fck", &eac_fck, CK_242X),
CLK("omap_hdq.0", "ick", &hdq_ick, CK_243X | CK_242X),
CLK("omap_hdq.1", "fck", &hdq_fck, CK_243X | CK_242X),
CLK("i2c_omap.1", "ick", &i2c1_ick, CK_243X | CK_242X),
CLK("i2c_omap.1", "fck", &i2c1_fck, CK_242X),
CLK("i2c_omap.1", "fck", &i2chs1_fck, CK_243X),
CLK("i2c_omap.2", "ick", &i2c2_ick, CK_243X | CK_242X),
CLK("i2c_omap.2", "fck", &i2c2_fck, CK_242X),
CLK("i2c_omap.2", "fck", &i2chs2_fck, CK_243X),
CLK(NULL, "gpmc_fck", &gpmc_fck, CK_243X | CK_242X),
CLK(NULL, "sdma_fck", &sdma_fck, CK_243X | CK_242X),
CLK(NULL, "sdma_ick", &sdma_ick, CK_243X | CK_242X),
CLK(NULL, "vlynq_ick", &vlynq_ick, CK_242X),
CLK(NULL, "vlynq_fck", &vlynq_fck, CK_242X),
CLK(NULL, "sdrc_ick", &sdrc_ick, CK_243X),
CLK(NULL, "des_ick", &des_ick, CK_243X | CK_242X),
CLK(NULL, "sha_ick", &sha_ick, CK_243X | CK_242X),
CLK("omap_rng", "ick", &rng_ick, CK_243X | CK_242X),
CLK(NULL, "aes_ick", &aes_ick, CK_243X | CK_242X),
CLK(NULL, "pka_ick", &pka_ick, CK_243X | CK_242X),
CLK(NULL, "usb_fck", &usb_fck, CK_243X | CK_242X),
CLK(NULL, "usbhs_ick", &usbhs_ick, CK_243X),
CLK("mmci-omap-hs.0", "ick", &mmchs1_ick, CK_243X),
CLK("mmci-omap-hs.0", "fck", &mmchs1_fck, CK_243X),
CLK("mmci-omap-hs.1", "ick", &mmchs2_ick, CK_243X),
CLK("mmci-omap-hs.1", "fck", &mmchs2_fck, CK_243X),
CLK(NULL, "gpio5_ick", &gpio5_ick, CK_243X),
CLK(NULL, "gpio5_fck", &gpio5_fck, CK_243X),
CLK(NULL, "mdm_intc_ick", &mdm_intc_ick, CK_243X),
CLK("mmci-omap-hs.0", "mmchsdb_fck", &mmchsdb1_fck, CK_243X),
CLK("mmci-omap-hs.1", "mmchsdb_fck", &mmchsdb2_fck, CK_243X),
};
/* CM_CLKEN_PLL.EN_{54,96}M_PLL options (24XX) */
#define EN_APLL_STOPPED 0
#define EN_APLL_LOCKED 3
/* CM_CLKSEL1_PLL.APLLS_CLKIN options (24XX) */
#define APLLS_CLKIN_19_2MHZ 0
#define APLLS_CLKIN_13MHZ 2
#define APLLS_CLKIN_12MHZ 3
/* #define DOWN_VARIABLE_DPLL 1 */ /* Experimental */
static struct prcm_config *curr_prcm_set;
static struct clk *vclk;
static struct clk *sclk;
/*-------------------------------------------------------------------------
* Omap24xx specific clock functions
*-------------------------------------------------------------------------*/
/**
* omap2xxx_clk_get_core_rate - return the CORE_CLK rate
* @clk: pointer to the combined dpll_ck + core_ck (currently "dpll_ck")
*
* Returns the CORE_CLK rate. CORE_CLK can have one of three rate
* sources on OMAP2xxx: the DPLL CLKOUT rate, DPLL CLKOUTX2, or 32KHz
* (the latter is unusual). This currently should be called with
* struct clk *dpll_ck, which is a composite clock of dpll_ck and
* core_ck.
*/
static unsigned long omap2xxx_clk_get_core_rate(struct clk *clk)
{
long long core_clk;
u32 v;
core_clk = omap2_get_dpll_rate(clk);
v = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
v &= OMAP24XX_CORE_CLK_SRC_MASK;
if (v == CORE_CLK_SRC_32K)
core_clk = 32768;
else
core_clk *= v;
return core_clk;
}
static int omap2_enable_osc_ck(struct clk *clk)
{
u32 pcc;
pcc = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
__raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK,
OMAP24XX_PRCM_CLKSRC_CTRL);
return 0;
}
static void omap2_disable_osc_ck(struct clk *clk)
{
u32 pcc;
pcc = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
__raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK,
OMAP24XX_PRCM_CLKSRC_CTRL);
}
static const struct clkops clkops_oscck = {
.enable = &omap2_enable_osc_ck,
.disable = &omap2_disable_osc_ck,
};
#ifdef OLD_CK
/* Recalculate SYST_CLK */
static void omap2_sys_clk_recalc(struct clk * clk)
{
u32 div = PRCM_CLKSRC_CTRL;
div &= (1 << 7) | (1 << 6); /* Test if ext clk divided by 1 or 2 */
div >>= clk->rate_offset;
clk->rate = (clk->parent->rate / div);
propagate_rate(clk);
}
#endif /* OLD_CK */
/* Enable an APLL if off */
static int omap2_clk_fixed_enable(struct clk *clk)
{
u32 cval, apll_mask;
apll_mask = EN_APLL_LOCKED << clk->enable_bit;
cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
if ((cval & apll_mask) == apll_mask)
return 0; /* apll already enabled */
cval &= ~apll_mask;
cval |= apll_mask;
cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
if (clk == &apll96_ck)
cval = OMAP24XX_ST_96M_APLL;
else if (clk == &apll54_ck)
cval = OMAP24XX_ST_54M_APLL;
omap2_wait_clock_ready(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval,
clk->name);
/*
* REVISIT: Should we return an error code if omap2_wait_clock_ready()
* fails?
*/
return 0;
}
/* Stop APLL */
static void omap2_clk_fixed_disable(struct clk *clk)
{
u32 cval;
cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
cval &= ~(EN_APLL_LOCKED << clk->enable_bit);
cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
}
static const struct clkops clkops_fixed = {
.enable = &omap2_clk_fixed_enable,
.disable = &omap2_clk_fixed_disable,
};
/*
* Uses the current prcm set to tell if a rate is valid.
* You can go slower, but not faster within a given rate set.
*/
static long omap2_dpllcore_round_rate(unsigned long target_rate)
{
u32 high, low, core_clk_src;
core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK;
if (core_clk_src == CORE_CLK_SRC_DPLL) { /* DPLL clockout */
high = curr_prcm_set->dpll_speed * 2;
low = curr_prcm_set->dpll_speed;
} else { /* DPLL clockout x 2 */
high = curr_prcm_set->dpll_speed;
low = curr_prcm_set->dpll_speed / 2;
}
#ifdef DOWN_VARIABLE_DPLL
if (target_rate > high)
return high;
else
return target_rate;
#else
if (target_rate > low)
return high;
else
return low;
#endif
}
static unsigned long omap2_dpllcore_recalc(struct clk *clk)
{
return omap2xxx_clk_get_core_rate(clk);
}
static int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate)
{
u32 cur_rate, low, mult, div, valid_rate, done_rate;
u32 bypass = 0;
struct prcm_config tmpset;
const struct dpll_data *dd;
cur_rate = omap2xxx_clk_get_core_rate(&dpll_ck);
mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
mult &= OMAP24XX_CORE_CLK_SRC_MASK;
if ((rate == (cur_rate / 2)) && (mult == 2)) {
omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
} else if ((rate == (cur_rate * 2)) && (mult == 1)) {
omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
} else if (rate != cur_rate) {
valid_rate = omap2_dpllcore_round_rate(rate);
if (valid_rate != rate)
return -EINVAL;
if (mult == 1)
low = curr_prcm_set->dpll_speed;
else
low = curr_prcm_set->dpll_speed / 2;
dd = clk->dpll_data;
if (!dd)
return -EINVAL;
tmpset.cm_clksel1_pll = __raw_readl(dd->mult_div1_reg);
tmpset.cm_clksel1_pll &= ~(dd->mult_mask |
dd->div1_mask);
div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK;
if (rate > low) {
tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2;
mult = ((rate / 2) / 1000000);
done_rate = CORE_CLK_SRC_DPLL_X2;
} else {
tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL;
mult = (rate / 1000000);
done_rate = CORE_CLK_SRC_DPLL;
}
tmpset.cm_clksel1_pll |= (div << __ffs(dd->mult_mask));
tmpset.cm_clksel1_pll |= (mult << __ffs(dd->div1_mask));
/* Worst case */
tmpset.base_sdrc_rfr = SDRC_RFR_CTRL_BYPASS;
if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */
bypass = 1;
/* For omap2xxx_sdrc_init_params() */
omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
/* Force dll lock mode */
omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
bypass);
/* Errata: ret dll entry state */
omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
omap2xxx_sdrc_reprogram(done_rate, 0);
}
return 0;
}
/**
* omap2_table_mpu_recalc - just return the MPU speed
* @clk: virt_prcm_set struct clk
*
* Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
*/
static unsigned long omap2_table_mpu_recalc(struct clk *clk)
{
return curr_prcm_set->mpu_speed;
}
/*
* Look for a rate equal or less than the target rate given a configuration set.
*
* What's not entirely clear is "which" field represents the key field.
* Some might argue L3-DDR, others ARM, others IVA. This code is simple and
* just uses the ARM rates.
*/
static long omap2_round_to_table_rate(struct clk *clk, unsigned long rate)
{
struct prcm_config *ptr;
long highest_rate;
if (clk != &virt_prcm_set)
return -EINVAL;
highest_rate = -EINVAL;
for (ptr = rate_table; ptr->mpu_speed; ptr++) {
if (!(ptr->flags & cpu_mask))
continue;
if (ptr->xtal_speed != sys_ck.rate)
continue;
highest_rate = ptr->mpu_speed;
/* Can check only after xtal frequency check */
if (ptr->mpu_speed <= rate)
break;
}
return highest_rate;
}
/* Sets basic clocks based on the specified rate */
static int omap2_select_table_rate(struct clk *clk, unsigned long rate)
{
u32 cur_rate, done_rate, bypass = 0, tmp;
struct prcm_config *prcm;
unsigned long found_speed = 0;
unsigned long flags;
if (clk != &virt_prcm_set)
return -EINVAL;
for (prcm = rate_table; prcm->mpu_speed; prcm++) {
if (!(prcm->flags & cpu_mask))
continue;
if (prcm->xtal_speed != sys_ck.rate)
continue;
if (prcm->mpu_speed <= rate) {
found_speed = prcm->mpu_speed;
break;
}
}
if (!found_speed) {
printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
rate / 1000000);
return -EINVAL;
}
curr_prcm_set = prcm;
cur_rate = omap2xxx_clk_get_core_rate(&dpll_ck);
if (prcm->dpll_speed == cur_rate / 2) {
omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
} else if (prcm->dpll_speed == cur_rate * 2) {
omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
} else if (prcm->dpll_speed != cur_rate) {
local_irq_save(flags);
if (prcm->dpll_speed == prcm->xtal_speed)
bypass = 1;
if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) ==
CORE_CLK_SRC_DPLL_X2)
done_rate = CORE_CLK_SRC_DPLL_X2;
else
done_rate = CORE_CLK_SRC_DPLL;
/* MPU divider */
cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);
/* dsp + iva1 div(2420), iva2.1(2430) */
cm_write_mod_reg(prcm->cm_clksel_dsp,
OMAP24XX_DSP_MOD, CM_CLKSEL);
cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);
/* Major subsystem dividers */
tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD,
CM_CLKSEL1);
if (cpu_is_omap2430())
cm_write_mod_reg(prcm->cm_clksel_mdm,
OMAP2430_MDM_MOD, CM_CLKSEL);
/* x2 to enter omap2xxx_sdrc_init_params() */
omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
bypass);
omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
omap2xxx_sdrc_reprogram(done_rate, 0);
local_irq_restore(flags);
}
return 0;
}
#ifdef CONFIG_CPU_FREQ
/*
* Walk PRCM rate table and fillout cpufreq freq_table
*/
static struct cpufreq_frequency_table freq_table[ARRAY_SIZE(rate_table)];
void omap2_clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
{
struct prcm_config *prcm;
int i = 0;
for (prcm = rate_table; prcm->mpu_speed; prcm++) {
if (!(prcm->flags & cpu_mask))
continue;
if (prcm->xtal_speed != sys_ck.rate)
continue;
/* don't put bypass rates in table */
if (prcm->dpll_speed == prcm->xtal_speed)
continue;
freq_table[i].index = i;
freq_table[i].frequency = prcm->mpu_speed / 1000;
i++;
}
if (i == 0) {
printk(KERN_WARNING "%s: failed to initialize frequency "
"table\n", __func__);
return;
}
freq_table[i].index = i;
freq_table[i].frequency = CPUFREQ_TABLE_END;
*table = &freq_table[0];
}
#endif
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,
#ifdef CONFIG_CPU_FREQ
.clk_init_cpufreq_table = omap2_clk_init_cpufreq_table,
#endif
};
static u32 omap2_get_apll_clkin(void)
{
u32 aplls, srate = 0;
aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
aplls &= OMAP24XX_APLLS_CLKIN_MASK;
aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT;
if (aplls == APLLS_CLKIN_19_2MHZ)
srate = 19200000;
else if (aplls == APLLS_CLKIN_13MHZ)
srate = 13000000;
else if (aplls == APLLS_CLKIN_12MHZ)
srate = 12000000;
return srate;
}
static u32 omap2_get_sysclkdiv(void)
{
u32 div;
div = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
div &= OMAP_SYSCLKDIV_MASK;
div >>= OMAP_SYSCLKDIV_SHIFT;
return div;
}
static unsigned long omap2_osc_clk_recalc(struct clk *clk)
{
return omap2_get_apll_clkin() * omap2_get_sysclkdiv();
}
static unsigned long omap2_sys_clk_recalc(struct clk *clk)
{
return clk->parent->rate / omap2_get_sysclkdiv();
}
/*
* Set clocks for bypass mode for reboot to work.
*/
void omap2_clk_prepare_for_reboot(void)
{
u32 rate;
if (vclk == NULL || sclk == NULL)
return;
rate = clk_get_rate(sclk);
clk_set_rate(vclk, rate);
}
/*
* 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;
if (clk_set_rate(&virt_prcm_set, mpurate))
printk(KERN_ERR "Could not find matching MPU rate\n");
recalculate_root_clocks();
printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
"%ld.%01ld/%ld/%ld MHz\n",
(sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
(dpll_ck.rate / 1000000), (mpu_ck.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, cpu_mask;
if (cpu_is_omap242x())
cpu_mask = RATE_IN_242X;
else if (cpu_is_omap2430())
cpu_mask = RATE_IN_243X;
clk_init(&omap2_clk_functions);
osc_ck.rate = omap2_osc_clk_recalc(&osc_ck);
propagate_rate(&osc_ck);
sys_ck.rate = omap2_sys_clk_recalc(&sys_ck);
propagate_rate(&sys_ck);
for (c = omap24xx_clks; c < omap24xx_clks + ARRAY_SIZE(omap24xx_clks); c++)
clk_init_one(c->lk.clk);
cpu_mask = 0;
if (cpu_is_omap2420())
cpu_mask |= CK_242X;
if (cpu_is_omap2430())
cpu_mask |= CK_243X;
for (c = omap24xx_clks; c < omap24xx_clks + ARRAY_SIZE(omap24xx_clks); c++)
if (c->cpu & cpu_mask) {
clkdev_add(&c->lk);
clk_register(c->lk.clk);
}
/* Check the MPU rate set by bootloader */
clkrate = omap2xxx_clk_get_core_rate(&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;
recalculate_root_clocks();
printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
"%ld.%01ld/%ld/%ld MHz\n",
(sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
(dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
/*
* Only enable those clocks we will need, let the drivers
* enable other clocks as necessary
*/
clk_enable_init_clocks();
/* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
vclk = clk_get(NULL, "virt_prcm_set");
sclk = clk_get(NULL, "sys_ck");
return 0;
}
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