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416db864c1
linux/arch/arm/mach-omap2/clock34xx.c
Paul Walmsley 416db864c1 [ARM] OMAP3 clock: disable DPLL autoidle while waiting for DPLL to lock 
During _omap3_noncore_dpll_lock(), if a DPLL has no active downstream
clocks and DPLL autoidle is enabled, the DPLL may never lock, since it
will enter autoidle immediately.  To resolve this, disable DPLL
autoidle while locking the DPLL, and unconditionally wait for the DPLL
to lock.  This fixes some bugs where the kernel would hang when returning
from retention or return the wrong rate for the DPLL.

This patch is a collaboration with Peter de Schrijver
<peter.de-schrijver@nokia.com> and Kevin Hilman
<khilman@deeprootsystems.com>.

linux-omap source commit is 3b7de4be879f1f4f55ae59882a5cbd80f6dcf0f0.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: Peter de Schrijver <peter.de-schrijver@nokia.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2009-02-08 17:50:35 +00:00

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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 "memory.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, "virt_omap_54m_fck", &virt_omap_54m_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, "omap_120m_fck", &omap_120m_fck, 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, "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(NULL, "hsotgusb_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(NULL, "dss1_alwon_fck", &dss1_alwon_fck, CK_343X),
CLK(NULL, "dss_tv_fck", &dss_tv_fck, CK_343X),
CLK(NULL, "dss_96m_fck", &dss_96m_fck, CK_343X),
CLK(NULL, "dss2_alwon_fck", &dss2_alwon_fck, CK_343X),
CLK(NULL, "dss_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
/**
* omap3_dpll_recalc - recalculate DPLL rate
* @clk: DPLL struct clk
*
* Recalculate and propagate the DPLL rate.
*/
static void omap3_dpll_recalc(struct clk *clk)
{
clk->rate = 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->parent->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;
if (clk == &dpll3_ck)
return -EINVAL;
if (clk->parent->rate == omap2_get_dpll_rate(clk))
r = _omap3_noncore_dpll_bypass(clk);
else
r = _omap3_noncore_dpll_lock(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
*
* Program the DPLL with the rounded target rate. Returns -EINVAL upon
* error, or 0 upon success.
*/
static int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate)
{
u16 freqsel;
struct dpll_data *dd;
if (!clk || !rate)
return -EINVAL;
dd = clk->dpll_data;
if (!dd)
return -EINVAL;
if (rate == omap2_get_dpll_rate(clk))
return 0;
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);
omap3_noncore_dpll_program(clk, dd->last_rounded_m, dd->last_rounded_n,
freqsel);
omap3_dpll_recalc(clk);
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);
}
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 void omap3_clkoutx2_recalc(struct clk *clk)
{
const struct dpll_data *dd;
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->control_reg || !dd->enable_mask);
v = __raw_readl(dd->control_reg) & dd->enable_mask;
v >>= __ffs(dd->enable_mask);
if (v != DPLL_LOCKED)
clk->rate = clk->parent->rate;
else
clk->rate = clk->parent->rate * 2;
}
/* 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 (omap2_select_table_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++)
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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