/**
* 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->bypass_clk->rate)
r = _omap3_noncore_dpll_bypass(clk);
else
r = _omap3_noncore_dpll_lock(clk);
return r;
}
/*
* 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);
if (dd->jtype) {
u8 dco, sd_div;
lookup_dco_sddiv(clk, &dco, &sd_div, m, n);
v &= ~(dd->dco_sel_mask | dd->sd_div_mask);
v |= dco << __ffs(dd->dco_sel_mask);
v |= sd_div << __ffs(dd->sd_div_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.
*/
int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate)
{
struct clk *new_parent = NULL;
u16 freqsel = 0;
struct dpll_data *dd;
int ret;
unsigned long orig_rate = 0;
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 {
/*
* On 4460, the MPU clk for frequencies higher than 1Ghz
* is sourced from CLKOUTX2_M3, instead of CLKOUT_M2, while
* value of M3 is fixed to 1. Hence for frequencies higher
* than 1 Ghz, lock the DPLL at half the rate so the
* CLKOUTX2_M3 then matches the requested rate.
*/
if (cpu_is_omap4460() && !strcmp(clk->name, "dpll_mpu_ck")
&& (rate > 1000000000)) {
orig_rate = rate;
rate = rate/2;
}
if (dd->last_rounded_rate != rate)
rate = clk->round_rate(clk, rate);
if (dd->last_rounded_rate == 0)
return -EINVAL;
/* No freqsel on OMAP4 and OMAP3630 */
if (!cpu_is_omap44xx() && !cpu_is_omap3630()) {
freqsel = _omap3_dpll_compute_freqsel(clk,
dd->last_rounded_n);
if (!freqsel)
WARN_ON(1);
}
/* Set the rate back to original for book keeping*/
if (orig_rate)
rate = orig_rate;
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, orig_rate);
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;
}
/*
* _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,
unsigned long orig_rate)
{
struct dpll_data *dd = clk->dpll_data;
u8 dco, sd_div;
u32 v;
/*
* On OMAP4460, to obtain MPU DPLL frequency higher
* than 1GHz, DCC (Duty Cycle Correction) needs to
* be enabled.
* Also the interconnect frequency to EMIF should
* be switched between MPU clk divide by 4 (for
* frequencies higher than 920Mhz) and MPU clk divide
* by 2 (for frequencies lower than or equal to 920Mhz)
* Lastly the async bridge to ABE must be MPU clk divide
* by 8 for MPU clk > 748Mhz and MPU clk divide by 4
* for lower frequencies.
* TODO: For now use a strcmp, but need to find a
* better way to identify the MPU dpll.
*/
if (cpu_is_omap4460() && !strcmp(clk->name, "dpll_mpu_ck")) {
/* DCC control */
v = __raw_readl(dd->mult_div1_reg);
if ((orig_rate <= 1000000000) && (v & OMAP4460_DCC_EN_MASK)) {
v &= ~OMAP4460_DCC_EN_MASK; /* Disable DCC */
__raw_writel(v, dd->mult_div1_reg);
}
}
/* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */
_omap3_noncore_dpll_bypass(clk);
/*
* Set jitter correction. No jitter correction for OMAP4 and 3630
* since freqsel field is no longer present
*/
if (!cpu_is_omap44xx() && !cpu_is_omap3630()) {
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);
/* Configure dco and sd_div for dplls that have these fields */
if (dd->dco_mask) {
_lookup_dco(clk, &dco, m, n);
v &= ~(dd->dco_mask);
v |= dco << __ffs(dd->dco_mask);
}
if (dd->sddiv_mask) {
_lookup_sddiv(clk, &sd_div, m, n);
v &= ~(dd->sddiv_mask);
v |= sd_div << __ffs(dd->sddiv_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);
if (cpu_is_omap4460() && !strcmp(clk->name, "dpll_mpu_ck")) {
/* DCC control */
if (orig_rate > 1000000000) {
v &= ~OMAP4460_DCC_COUNT_MAX_MASK;
v |= (5 << OMAP4460_DCC_COUNT_MAX_SHIFT);
__raw_writel(v, dd->mult_div1_reg);
v |= OMAP4460_DCC_EN_MASK; /* Enable DCC */
__raw_writel(v, dd->mult_div1_reg);
}
/* EMIF/ABE clock rate control */
v = __raw_readl(OMAP4430_CM_MPU_MPU_CLKCTRL);
if (orig_rate > 920000000)
v |= OMAP4460_CLKSEL_EMIF_DIV_MODE_MASK;
else
v &= ~OMAP4460_CLKSEL_EMIF_DIV_MODE_MASK;
if (orig_rate > 748000000)
v |= OMAP4460_CLKSEL_ABE_DIV_MODE_MASK;
else
v &= ~OMAP4460_CLKSEL_ABE_DIV_MODE_MASK;
__raw_writel(v, OMAP4430_CM_MPU_MPU_CLKCTRL);
}
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.
*/
int omap3_noncore_dpll_set_rate(struct clk *clk, unsigned long rate)
{
struct clk *new_parent = NULL;
u16 freqsel = 0;
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)
rate = clk->round_rate(clk, rate);
if (dd->last_rounded_rate == 0)
return -EINVAL;
/* No freqsel on OMAP4 and OMAP3630 */
if (!cpu_is_omap44xx() && !cpu_is_omap3630()) {
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 hierarchy, 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;
}
/**
* 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.
*/
int omap3_noncore_dpll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_hw_omap *clk = to_clk_hw_omap(hw);
struct clk *new_parent = NULL;
unsigned long rrate;
u16 freqsel = 0;
struct dpll_data *dd;
int ret;
if (!hw || !rate)
return -EINVAL;
dd = clk->dpll_data;
if (!dd)
return -EINVAL;
if (__clk_get_rate(dd->clk_bypass) == rate &&
(dd->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
pr_debug("%s: %s: set rate: entering bypass.\n",
__func__, __clk_get_name(hw->clk));
__clk_prepare(dd->clk_bypass);
clk_enable(dd->clk_bypass);
ret = _omap3_noncore_dpll_bypass(clk);
if (!ret)
new_parent = dd->clk_bypass;
clk_disable(dd->clk_bypass);
__clk_unprepare(dd->clk_bypass);
} else {
__clk_prepare(dd->clk_ref);
clk_enable(dd->clk_ref);
if (dd->last_rounded_rate != rate) {
rrate = __clk_round_rate(hw->clk, rate);
if (rrate != rate) {
pr_warn("%s: %s: final rate %lu does not match desired rate %lu\n",
__func__, __clk_get_name(hw->clk),
rrate, rate);
rate = rrate;
}
}
if (dd->last_rounded_rate == 0)
return -EINVAL;
/* Freqsel is available only on OMAP343X devices */
if (cpu_is_omap343x()) {
freqsel = _omap3_dpll_compute_freqsel(clk,
dd->last_rounded_n);
WARN_ON(!freqsel);
}
pr_debug("%s: %s: set rate: locking rate to %lu.\n",
__func__, __clk_get_name(hw->clk), rate);
ret = omap3_noncore_dpll_program(clk, freqsel);
if (!ret)
new_parent = dd->clk_ref;
clk_disable(dd->clk_ref);
__clk_unprepare(dd->clk_ref);
}
/*
* FIXME - this is all wrong. common code handles reparenting and
* migrating prepare/enable counts. dplls should be a multiplexer
* clock and this should be a set_parent operation so that all of that
* stuff is inherited for free
*/
if (!ret && clk_get_parent(hw->clk) != new_parent)
__clk_reparent(hw->clk, new_parent);
return 0;
}
/*
* _omap3_noncore_dpll_program - set non-core DPLL M,N values directly
* @clk: struct clk * of DPLL to set
* @freqsel: FREQSEL value to set
*
* Program the DPLL with the last M, N values calculated, and wait for
* the DPLL to lock. Returns -EINVAL upon error, or 0 upon success.
*/
static int omap3_noncore_dpll_program(struct clk_hw_omap *clk, u16 freqsel)
{
struct dpll_data *dd = clk->dpll_data;
u8 dco, sd_div;
u32 v;
/* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */
_omap3_noncore_dpll_bypass(clk);
if (dd->sink_clkdm)
clkdm_clk_enable(dd->sink_clkdm, clk->hw.clk);
/*
* Set jitter correction. Jitter correction applicable for OMAP343X
* only since freqsel field is no longer present on other devices.
*/
if (cpu_is_omap343x()) {
v = omap2_clk_readl(clk, dd->control_reg);
v &= ~dd->freqsel_mask;
v |= freqsel << __ffs(dd->freqsel_mask);
omap2_clk_writel(v, clk, dd->control_reg);
}
/* Set DPLL multiplier, divider */
v = omap2_clk_readl(clk, dd->mult_div1_reg);
/* Handle Duty Cycle Correction */
if (dd->dcc_mask) {
if (dd->last_rounded_rate >= dd->dcc_rate)
v |= dd->dcc_mask; /* Enable DCC */
else
v &= ~dd->dcc_mask; /* Disable DCC */
}
v &= ~(dd->mult_mask | dd->div1_mask);
v |= dd->last_rounded_m << __ffs(dd->mult_mask);
v |= (dd->last_rounded_n - 1) << __ffs(dd->div1_mask);
/* Configure dco and sd_div for dplls that have these fields */
if (dd->dco_mask) {
_lookup_dco(clk, &dco, dd->last_rounded_m, dd->last_rounded_n);
v &= ~(dd->dco_mask);
v |= dco << __ffs(dd->dco_mask);
}
if (dd->sddiv_mask) {
_lookup_sddiv(clk, &sd_div, dd->last_rounded_m,
dd->last_rounded_n);
v &= ~(dd->sddiv_mask);
v |= sd_div << __ffs(dd->sddiv_mask);
}
omap2_clk_writel(v, clk, dd->mult_div1_reg);
/* Set 4X multiplier and low-power mode */
if (dd->m4xen_mask || dd->lpmode_mask) {
v = omap2_clk_readl(clk, dd->control_reg);
if (dd->m4xen_mask) {
if (dd->last_rounded_m4xen)
v |= dd->m4xen_mask;
else
v &= ~dd->m4xen_mask;
}
if (dd->lpmode_mask) {
if (dd->last_rounded_lpmode)
v |= dd->lpmode_mask;
else
v &= ~dd->lpmode_mask;
}
omap2_clk_writel(v, clk, dd->control_reg);
}
/* We let the clock framework set the other output dividers later */
/* REVISIT: Set ramp-up delay? */
_omap3_noncore_dpll_lock(clk);
if (dd->sink_clkdm)
clkdm_clk_disable(dd->sink_clkdm, clk->hw.clk);
return 0;
}
/*
* _omap3_noncore_dpll_program - set non-core DPLL M,N values directly
* @clk: struct clk * of DPLL to set
* @freqsel: FREQSEL value to set
*
* Program the DPLL with the last M, N values calculated, and wait for
* the DPLL to lock. Returns -EINVAL upon error, or 0 upon success.
*/
static int omap3_noncore_dpll_program(struct clk_hw_omap *clk, u16 freqsel)
{
struct dpll_data *dd = clk->dpll_data;
u8 dco, sd_div, ai = 0;
u32 v;
bool errata_i810;
/* 3430 ES2 TRM: 4.7.6.9 DPLL Programming Sequence */
_omap3_noncore_dpll_bypass(clk);
/*
* Set jitter correction. Jitter correction applicable for OMAP343X
* only since freqsel field is no longer present on other devices.
*/
if (ti_clk_get_features()->flags & TI_CLK_DPLL_HAS_FREQSEL) {
v = ti_clk_ll_ops->clk_readl(&dd->control_reg);
v &= ~dd->freqsel_mask;
v |= freqsel << __ffs(dd->freqsel_mask);
ti_clk_ll_ops->clk_writel(v, &dd->control_reg);
}
/* Set DPLL multiplier, divider */
v = ti_clk_ll_ops->clk_readl(&dd->mult_div1_reg);
/* Handle Duty Cycle Correction */
if (dd->dcc_mask) {
if (dd->last_rounded_rate >= dd->dcc_rate)
v |= dd->dcc_mask; /* Enable DCC */
else
v &= ~dd->dcc_mask; /* Disable DCC */
}
v &= ~(dd->mult_mask | dd->div1_mask);
v |= dd->last_rounded_m << __ffs(dd->mult_mask);
v |= (dd->last_rounded_n - 1) << __ffs(dd->div1_mask);
/* Configure dco and sd_div for dplls that have these fields */
if (dd->dco_mask) {
_lookup_dco(clk, &dco, dd->last_rounded_m, dd->last_rounded_n);
v &= ~(dd->dco_mask);
v |= dco << __ffs(dd->dco_mask);
}
if (dd->sddiv_mask) {
_lookup_sddiv(clk, &sd_div, dd->last_rounded_m,
dd->last_rounded_n);
v &= ~(dd->sddiv_mask);
v |= sd_div << __ffs(dd->sddiv_mask);
}
/*
* Errata i810 - DPLL controller can get stuck while transitioning
* to a power saving state. Software must ensure the DPLL can not
* transition to a low power state while changing M/N values.
* Easiest way to accomplish this is to prevent DPLL autoidle
* before doing the M/N re-program.
*/
errata_i810 = ti_clk_get_features()->flags & TI_CLK_ERRATA_I810;
if (errata_i810) {
ai = omap3_dpll_autoidle_read(clk);
if (ai) {
omap3_dpll_deny_idle(clk);
/* OCP barrier */
omap3_dpll_autoidle_read(clk);
}
}
ti_clk_ll_ops->clk_writel(v, &dd->mult_div1_reg);
/* Set 4X multiplier and low-power mode */
if (dd->m4xen_mask || dd->lpmode_mask) {
v = ti_clk_ll_ops->clk_readl(&dd->control_reg);
if (dd->m4xen_mask) {
if (dd->last_rounded_m4xen)
v |= dd->m4xen_mask;
else
v &= ~dd->m4xen_mask;
}
if (dd->lpmode_mask) {
if (dd->last_rounded_lpmode)
v |= dd->lpmode_mask;
else
v &= ~dd->lpmode_mask;
}
ti_clk_ll_ops->clk_writel(v, &dd->control_reg);
}
/* We let the clock framework set the other output dividers later */
/* REVISIT: Set ramp-up delay? */
_omap3_noncore_dpll_lock(clk);
if (errata_i810 && ai)
omap3_dpll_allow_idle(clk);
return 0;
}
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;
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) {
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;
}
/**
* 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.
*/
int omap3_noncore_dpll_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate)
{
struct clk_hw_omap *clk = to_clk_hw_omap(hw);
struct clk *new_parent = NULL;
u16 freqsel = 0;
struct dpll_data *dd;
int ret;
if (!hw || !rate)
return -EINVAL;
dd = clk->dpll_data;
if (!dd)
return -EINVAL;
__clk_prepare(dd->clk_bypass);
clk_enable(dd->clk_bypass);
__clk_prepare(dd->clk_ref);
clk_enable(dd->clk_ref);
if (__clk_get_rate(dd->clk_bypass) == rate &&
(dd->modes & (1 << DPLL_LOW_POWER_BYPASS))) {
pr_debug("%s: %s: set rate: entering bypass.\n",
__func__, __clk_get_name(hw->clk));
ret = _omap3_noncore_dpll_bypass(clk);
if (!ret)
new_parent = dd->clk_bypass;
} else {
if (dd->last_rounded_rate != rate)
rate = __clk_round_rate(hw->clk, rate);
if (dd->last_rounded_rate == 0)
return -EINVAL;
/* No freqsel on OMAP4 and OMAP3630 */
if (!cpu_is_omap44xx() && !cpu_is_omap3630()) {
freqsel = _omap3_dpll_compute_freqsel(clk,
dd->last_rounded_n);
if (!freqsel)
WARN_ON(1);
}
pr_debug("%s: %s: set rate: locking rate to %lu.\n",
__func__, __clk_get_name(hw->clk), rate);
ret = omap3_noncore_dpll_program(clk, dd->last_rounded_m,
dd->last_rounded_n, freqsel);
if (!ret)
new_parent = dd->clk_ref;
}
/*
* FIXME - this is all wrong. common code handles reparenting and
* migrating prepare/enable counts. dplls should be a multiplexer
* clock and this should be a set_parent operation so that all of that
* stuff is inherited for free
*/
if (!ret)
__clk_reparent(hw->clk, new_parent);
clk_disable(dd->clk_ref);
__clk_unprepare(dd->clk_ref);
clk_disable(dd->clk_bypass);
__clk_unprepare(dd->clk_bypass);
return 0;
}
