#include <mach/clock.h>
#include <mach/clockdomain.h>
- #include <mach/sram.h>
#include <mach/cpu.h>
#include <asm/div64.h>
- #include "memory.h"
+ #include <mach/sdrc.h>
#include "sdrc.h"
#include "clock.h"
#include "prm.h"
#define DPLL_MIN_DIVIDER 1
/* Possible error results from _dpll_test_mult */
- #define DPLL_MULT_UNDERFLOW (1 << 0)
+ #define DPLL_MULT_UNDERFLOW -1
/*
* Scale factor to mitigate roundoff errors in DPLL rate rounding.
#define DPLL_ROUNDING_VAL ((DPLL_SCALE_BASE / 2) * \
(DPLL_SCALE_FACTOR / DPLL_SCALE_BASE))
+ /* DPLL valid Fint frequency band limits - from 34xx TRM Section 4.7.6.2 */
+ #define DPLL_FINT_BAND1_MIN 750000
+ #define DPLL_FINT_BAND1_MAX 2100000
+ #define DPLL_FINT_BAND2_MIN 7500000
+ #define DPLL_FINT_BAND2_MAX 21000000
+
+ /* _dpll_test_fint() return codes */
+ #define DPLL_FINT_UNDERFLOW -1
+ #define DPLL_FINT_INVALID -2
+
u8 cpu_mask;
/*-------------------------------------------------------------------------
* OMAP2/3 specific clock functions
*-------------------------------------------------------------------------*/
+ /**
+ * _omap2xxx_clk_commit - commit clock parent/rate changes in hardware
+ * @clk: struct clk *
+ *
+ * If @clk has the DELAYED_APP flag set, meaning that parent/rate changes
+ * don't take effect until the VALID_CONFIG bit is written, write the
+ * VALID_CONFIG bit and wait for the write to complete. No return value.
+ */
+ static void _omap2xxx_clk_commit(struct clk *clk)
+ {
+ if (!cpu_is_omap24xx())
+ return;
+
+ if (!(clk->flags & DELAYED_APP))
+ return;
+
+ prm_write_mod_reg(OMAP24XX_VALID_CONFIG, OMAP24XX_GR_MOD,
+ OMAP24XX_PRCM_CLKCFG_CTRL_OFFSET);
+ /* OCP barrier */
+ prm_read_mod_reg(OMAP24XX_GR_MOD, OMAP24XX_PRCM_CLKCFG_CTRL_OFFSET);
+ }
+
+ /*
+ * _dpll_test_fint - test whether an Fint value is valid for the DPLL
+ * @clk: DPLL struct clk to test
+ * @n: divider value (N) to test
+ *
+ * Tests whether a particular divider @n will result in a valid DPLL
+ * internal clock frequency Fint. See the 34xx TRM 4.7.6.2 "DPLL Jitter
+ * Correction". Returns 0 if OK, -1 if the enclosing loop can terminate
+ * (assuming that it is counting N upwards), or -2 if the enclosing loop
+ * should skip to the next iteration (again assuming N is increasing).
+ */
+ static int _dpll_test_fint(struct clk *clk, u8 n)
+ {
+ struct dpll_data *dd;
+ long fint;
+ int ret = 0;
+
+ dd = clk->dpll_data;
+
+ /* DPLL divider must result in a valid jitter correction val */
+ fint = clk->parent->rate / (n + 1);
+ if (fint < DPLL_FINT_BAND1_MIN) {
+
+ pr_debug("rejecting n=%d due to Fint failure, "
+ "lowering max_divider\n", n);
+ dd->max_divider = n;
+ ret = DPLL_FINT_UNDERFLOW;
+
+ } else if (fint > DPLL_FINT_BAND1_MAX &&
+ fint < DPLL_FINT_BAND2_MIN) {
+
+ pr_debug("rejecting n=%d due to Fint failure\n", n);
+ ret = DPLL_FINT_INVALID;
+
+ } else if (fint > DPLL_FINT_BAND2_MAX) {
+
+ pr_debug("rejecting n=%d due to Fint failure, "
+ "boosting min_divider\n", n);
+ dd->min_divider = n;
+ ret = DPLL_FINT_INVALID;
+
+ }
+
+ return ret;
+ }
+
/**
* omap2_init_clk_clkdm - look up a clockdomain name, store pointer in clk
* @clk: OMAP clock struct ptr to use
clk->name, clks->parent->name,
((clk->parent) ?
clk->parent->name : "NULL"));
- clk->parent = clks->parent;
+ clk_reparent(clk, clks->parent);
};
found = 1;
}
return;
}
- /* Returns the DPLL rate */
+ /**
+ * omap2_get_dpll_rate - returns the current DPLL CLKOUT rate
+ * @clk: struct clk * of a DPLL
+ *
+ * DPLLs can be locked or bypassed - basically, enabled or disabled.
+ * When locked, the DPLL output depends on the M and N values. When
+ * bypassed, on OMAP2xxx, the output rate is either the 32KiHz clock
+ * or sys_clk. Bypass rates on OMAP3 depend on the DPLL: DPLLs 1 and
+ * 2 are bypassed with dpll1_fclk and dpll2_fclk respectively
+ * (generated by DPLL3), while DPLL 3, 4, and 5 bypass rates are sys_clk.
+ * Returns the current DPLL CLKOUT rate (*not* CLKOUTX2) if the DPLL is
+ * locked, or the appropriate bypass rate if the DPLL is bypassed, or 0
+ * if the clock @clk is not a DPLL.
+ */
u32 omap2_get_dpll_rate(struct clk *clk)
{
long long dpll_clk;
- u32 dpll_mult, dpll_div, dpll;
+ u32 dpll_mult, dpll_div, v;
struct dpll_data *dd;
dd = clk->dpll_data;
- /* REVISIT: What do we return on error? */
if (!dd)
return 0;
- dpll = __raw_readl(dd->mult_div1_reg);
- dpll_mult = dpll & dd->mult_mask;
+ /* Return bypass rate if DPLL is bypassed */
+ v = __raw_readl(dd->control_reg);
+ v &= dd->enable_mask;
+ v >>= __ffs(dd->enable_mask);
+
+ if (cpu_is_omap24xx()) {
+ if (v == OMAP2XXX_EN_DPLL_LPBYPASS ||
+ v == OMAP2XXX_EN_DPLL_FRBYPASS)
+ return dd->clk_bypass->rate;
+ } else if (cpu_is_omap34xx()) {
+ if (v == OMAP3XXX_EN_DPLL_LPBYPASS ||
+ v == OMAP3XXX_EN_DPLL_FRBYPASS)
+ return dd->clk_bypass->rate;
+ }
+
+ v = __raw_readl(dd->mult_div1_reg);
+ dpll_mult = v & dd->mult_mask;
dpll_mult >>= __ffs(dd->mult_mask);
- dpll_div = dpll & dd->div1_mask;
+ dpll_div = v & dd->div1_mask;
dpll_div >>= __ffs(dd->div1_mask);
- dpll_clk = (long long)clk->parent->rate * dpll_mult;
+ dpll_clk = (long long)dd->clk_ref->rate * dpll_mult;
do_div(dpll_clk, dpll_div + 1);
return dpll_clk;
* Used for clocks that have the same value as the parent clock,
* divided by some factor
*/
- void omap2_fixed_divisor_recalc(struct clk *clk)
+ unsigned long omap2_fixed_divisor_recalc(struct clk *clk)
{
WARN_ON(!clk->fixed_div);
- clk->rate = clk->parent->rate / clk->fixed_div;
-
- if (clk->flags & RATE_PROPAGATES)
- propagate_rate(clk);
+ return clk->parent->rate / clk->fixed_div;
}
/**
* 24xx uses 0 to indicate not ready, and 1 to indicate ready.
* 34xx reverses this, just to keep us on our toes
*/
- if (cpu_mask & (RATE_IN_242X | RATE_IN_243X)) {
+ if (cpu_mask & (RATE_IN_242X | RATE_IN_243X))
ena = mask;
- } else if (cpu_mask & RATE_IN_343X) {
+ else if (cpu_mask & RATE_IN_343X)
ena = 0;
- }
/* Wait for lock */
while (((__raw_readl(reg) & mask) != ena) &&
* it and pull it into struct clk itself somehow.
*/
reg = clk->enable_reg;
- if ((((u32)reg & 0xff) >= CM_FCLKEN1) &&
- (((u32)reg & 0xff) <= OMAP24XX_CM_FCLKEN2))
- other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x10); /* CM_ICLKEN* */
- else if ((((u32)reg & 0xff) >= CM_ICLKEN1) &&
- (((u32)reg & 0xff) <= OMAP24XX_CM_ICLKEN4))
- other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x00); /* CM_FCLKEN* */
- else
- return;
- /* REVISIT: What are the appropriate exclusions for 34XX? */
- /* No check for DSS or cam clocks */
- if (cpu_is_omap24xx() && ((u32)reg & 0x0f) == 0) { /* CM_{F,I}CLKEN1 */
- if (clk->enable_bit == OMAP24XX_EN_DSS2_SHIFT ||
- clk->enable_bit == OMAP24XX_EN_DSS1_SHIFT ||
- clk->enable_bit == OMAP24XX_EN_CAM_SHIFT)
- return;
- }
-
- /* REVISIT: What are the appropriate exclusions for 34XX? */
- /* OMAP3: ignore DSS-mod clocks */
- if (cpu_is_omap34xx() &&
- (((u32)reg & ~0xff) == (u32)OMAP_CM_REGADDR(OMAP3430_DSS_MOD, 0) ||
- ((((u32)reg & ~0xff) == (u32)OMAP_CM_REGADDR(CORE_MOD, 0)) &&
- clk->enable_bit == OMAP3430_EN_SSI_SHIFT)))
- return;
+ /*
+ * Convert CM_ICLKEN* <-> CM_FCLKEN*. This conversion assumes
+ * it's just a matter of XORing the bits.
+ */
+ other_reg = (void __iomem *)((u32)reg ^ (CM_FCLKEN ^ CM_ICLKEN));
/* Check if both functional and interface clocks
* are running. */
omap2_wait_clock_ready(st_reg, bit, clk->name);
}
- /* Enables clock without considering parent dependencies or use count
- * REVISIT: Maybe change this to use clk->enable like on omap1?
- */
- int _omap2_clk_enable(struct clk *clk)
+ static int omap2_dflt_clk_enable(struct clk *clk)
{
- u32 regval32;
-
- if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
- return 0;
-
- if (clk->enable)
- return clk->enable(clk);
+ u32 v;
if (unlikely(clk->enable_reg == NULL)) {
printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
return 0; /* REVISIT: -EINVAL */
}
- regval32 = __raw_readl(clk->enable_reg);
+ v = __raw_readl(clk->enable_reg);
if (clk->flags & INVERT_ENABLE)
- regval32 &= ~(1 << clk->enable_bit);
+ v &= ~(1 << clk->enable_bit);
else
- regval32 |= (1 << clk->enable_bit);
- __raw_writel(regval32, clk->enable_reg);
- wmb();
-
- omap2_clk_wait_ready(clk);
+ v |= (1 << clk->enable_bit);
+ __raw_writel(v, clk->enable_reg);
+ v = __raw_readl(clk->enable_reg); /* OCP barrier */
return 0;
}
- /* Disables clock without considering parent dependencies or use count */
- void _omap2_clk_disable(struct clk *clk)
+ static int omap2_dflt_clk_enable_wait(struct clk *clk)
{
- u32 regval32;
-
- if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
- return;
+ int ret;
- if (clk->disable) {
- clk->disable(clk);
- return;
+ if (!clk->enable_reg) {
+ printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
+ clk->name);
+ return 0; /* REVISIT: -EINVAL */
}
- if (clk->enable_reg == NULL) {
+ ret = omap2_dflt_clk_enable(clk);
+ if (ret == 0)
+ omap2_clk_wait_ready(clk);
+ return ret;
+ }
+
+ static void omap2_dflt_clk_disable(struct clk *clk)
+ {
+ u32 v;
+
+ if (!clk->enable_reg) {
/*
* 'Independent' here refers to a clock which is not
* controlled by its parent.
return;
}
- regval32 = __raw_readl(clk->enable_reg);
+ v = __raw_readl(clk->enable_reg);
if (clk->flags & INVERT_ENABLE)
- regval32 |= (1 << clk->enable_bit);
+ v |= (1 << clk->enable_bit);
else
- regval32 &= ~(1 << clk->enable_bit);
- __raw_writel(regval32, clk->enable_reg);
- wmb();
+ v &= ~(1 << clk->enable_bit);
+ __raw_writel(v, clk->enable_reg);
+ /* No OCP barrier needed here since it is a disable operation */
+ }
+
+ const struct clkops clkops_omap2_dflt_wait = {
+ .enable = omap2_dflt_clk_enable_wait,
+ .disable = omap2_dflt_clk_disable,
+ };
+
+ const struct clkops clkops_omap2_dflt = {
+ .enable = omap2_dflt_clk_enable,
+ .disable = omap2_dflt_clk_disable,
+ };
+
+ /* Enables clock without considering parent dependencies or use count
+ * REVISIT: Maybe change this to use clk->enable like on omap1?
+ */
+ static int _omap2_clk_enable(struct clk *clk)
+ {
+ return clk->ops->enable(clk);
+ }
+
+ /* Disables clock without considering parent dependencies or use count */
+ static void _omap2_clk_disable(struct clk *clk)
+ {
+ clk->ops->disable(clk);
}
void omap2_clk_disable(struct clk *clk)
{
if (clk->usecount > 0 && !(--clk->usecount)) {
_omap2_clk_disable(clk);
- if (likely((u32)clk->parent))
+ if (clk->parent)
omap2_clk_disable(clk->parent);
if (clk->clkdm)
omap2_clkdm_clk_disable(clk->clkdm, clk);
int ret = 0;
if (clk->usecount++ == 0) {
- if (likely((u32)clk->parent))
- ret = omap2_clk_enable(clk->parent);
-
- if (unlikely(ret != 0)) {
- clk->usecount--;
- return ret;
- }
-
if (clk->clkdm)
omap2_clkdm_clk_enable(clk->clkdm, clk);
- ret = _omap2_clk_enable(clk);
-
- if (unlikely(ret != 0)) {
- if (clk->clkdm)
- omap2_clkdm_clk_disable(clk->clkdm, clk);
+ if (clk->parent) {
+ ret = omap2_clk_enable(clk->parent);
+ if (ret)
+ goto err;
+ }
- if (clk->parent) {
+ ret = _omap2_clk_enable(clk);
+ if (ret) {
+ if (clk->parent)
omap2_clk_disable(clk->parent);
- clk->usecount--;
- }
+
+ goto err;
}
}
+ return ret;
+ err:
+ if (clk->clkdm)
+ omap2_clkdm_clk_disable(clk->clkdm, clk);
+ clk->usecount--;
return ret;
}
* Used for clocks that are part of CLKSEL_xyz governed clocks.
* REVISIT: Maybe change to use clk->enable() functions like on omap1?
*/
- void omap2_clksel_recalc(struct clk *clk)
+ unsigned long omap2_clksel_recalc(struct clk *clk)
{
+ unsigned long rate;
u32 div = 0;
pr_debug("clock: recalc'ing clksel clk %s\n", clk->name);
div = omap2_clksel_get_divisor(clk);
if (div == 0)
- return;
+ return clk->rate;
- if (unlikely(clk->rate == clk->parent->rate / div))
- return;
- clk->rate = clk->parent->rate / div;
+ rate = clk->parent->rate / div;
- pr_debug("clock: new clock rate is %ld (div %d)\n", clk->rate, div);
+ pr_debug("clock: new clock rate is %ld (div %d)\n", rate, div);
- if (unlikely(clk->flags & RATE_PROPAGATES))
- propagate_rate(clk);
+ return rate;
}
/**
* the element associated with the supplied parent clock address.
* Returns a pointer to the struct clksel on success or NULL on error.
*/
- const struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
- struct clk *src_clk)
+ static const struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
+ struct clk *src_clk)
{
const struct clksel *clks;
*new_div = 1;
clks = omap2_get_clksel_by_parent(clk, clk->parent);
- if (clks == NULL)
+ if (!clks)
return ~0;
for (clkr = clks->rates; clkr->div; clkr++) {
/* Given a clock and a rate apply a clock specific rounding function */
long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
{
- if (clk->round_rate != NULL)
+ if (clk->round_rate)
return clk->round_rate(clk, rate);
if (clk->flags & RATE_FIXED)
const struct clksel_rate *clkr;
clks = omap2_get_clksel_by_parent(clk, clk->parent);
- if (clks == NULL)
+ if (!clks)
return 0;
for (clkr = clks->rates; clkr->div; clkr++) {
*
* Given a struct clk of a rate-selectable clksel clock, and a clock divisor,
* find the corresponding register field value. The return register value is
- * the value before left-shifting. Returns 0xffffffff on error
+ * the value before left-shifting. Returns ~0 on error
*/
u32 omap2_divisor_to_clksel(struct clk *clk, u32 div)
{
WARN_ON(div == 0);
clks = omap2_get_clksel_by_parent(clk, clk->parent);
- if (clks == NULL)
+ if (!clks)
- return 0;
+ return ~0;
for (clkr = clks->rates; clkr->div; clkr++) {
if ((clkr->flags & cpu_mask) && (clkr->div == div))
printk(KERN_ERR "clock: Could not find divisor %d for "
"clock %s parent %s\n", div, clk->name,
clk->parent->name);
- return 0;
+ return ~0;
}
return clkr->val;
}
- /**
- * omap2_get_clksel - find clksel register addr & field mask for a clk
- * @clk: struct clk to use
- * @field_mask: ptr to u32 to store the register field mask
- *
- * Returns the address of the clksel register upon success or NULL on error.
- */
- void __iomem *omap2_get_clksel(struct clk *clk, u32 *field_mask)
- {
- if (unlikely((clk->clksel_reg == NULL) || (clk->clksel_mask == NULL)))
- return NULL;
-
- *field_mask = clk->clksel_mask;
-
- return clk->clksel_reg;
- }
-
/**
* omap2_clksel_get_divisor - get current divider applied to parent clock.
* @clk: OMAP struct clk to use.
*/
u32 omap2_clksel_get_divisor(struct clk *clk)
{
- u32 field_mask, field_val;
- void __iomem *div_addr;
+ u32 v;
- div_addr = omap2_get_clksel(clk, &field_mask);
- if (div_addr == NULL)
+ if (!clk->clksel_mask)
return 0;
- field_val = __raw_readl(div_addr) & field_mask;
- field_val >>= __ffs(field_mask);
+ v = __raw_readl(clk->clksel_reg) & clk->clksel_mask;
+ v >>= __ffs(clk->clksel_mask);
- return omap2_clksel_to_divisor(clk, field_val);
+ return omap2_clksel_to_divisor(clk, v);
}
int omap2_clksel_set_rate(struct clk *clk, unsigned long rate)
{
- u32 field_mask, field_val, reg_val, validrate, new_div = 0;
- void __iomem *div_addr;
+ u32 v, field_val, validrate, new_div = 0;
- validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
- if (validrate != rate)
+ if (!clk->clksel_mask)
return -EINVAL;
- div_addr = omap2_get_clksel(clk, &field_mask);
- if (div_addr == NULL)
+ validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
+ if (validrate != rate)
return -EINVAL;
field_val = omap2_divisor_to_clksel(clk, new_div);
if (field_val == ~0)
return -EINVAL;
- reg_val = __raw_readl(div_addr);
- reg_val &= ~field_mask;
- reg_val |= (field_val << __ffs(field_mask));
- __raw_writel(reg_val, div_addr);
- wmb();
+ v = __raw_readl(clk->clksel_reg);
+ v &= ~clk->clksel_mask;
+ v |= field_val << __ffs(clk->clksel_mask);
+ __raw_writel(v, clk->clksel_reg);
+ v = __raw_readl(clk->clksel_reg); /* OCP barrier */
clk->rate = clk->parent->rate / new_div;
- if (clk->flags & DELAYED_APP && cpu_is_omap24xx()) {
- prm_write_mod_reg(OMAP24XX_VALID_CONFIG,
- OMAP24XX_GR_MOD, OMAP24XX_PRCM_CLKCFG_CTRL_OFFSET);
- wmb();
- }
+ _omap2xxx_clk_commit(clk);
return 0;
}
return -EINVAL;
/* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
- if (clk->set_rate != NULL)
+ if (clk->set_rate)
ret = clk->set_rate(clk, rate);
- if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
- propagate_rate(clk);
-
return ret;
}
/*
* Converts encoded control register address into a full address
- * On error, *src_addr will be returned as 0.
+ * On error, the return value (parent_div) will be 0.
*/
- static u32 omap2_clksel_get_src_field(void __iomem **src_addr,
- struct clk *src_clk, u32 *field_mask,
- struct clk *clk, u32 *parent_div)
+ static u32 _omap2_clksel_get_src_field(struct clk *src_clk, struct clk *clk,
+ u32 *field_val)
{
const struct clksel *clks;
const struct clksel_rate *clkr;
- *parent_div = 0;
- *src_addr = NULL;
-
clks = omap2_get_clksel_by_parent(clk, src_clk);
- if (clks == NULL)
+ if (!clks)
return 0;
for (clkr = clks->rates; clkr->div; clkr++) {
- if (clkr->flags & (cpu_mask | DEFAULT_RATE))
+ if (clkr->flags & cpu_mask && clkr->flags & DEFAULT_RATE)
break; /* Found the default rate for this platform */
}
/* Should never happen. Add a clksel mask to the struct clk. */
WARN_ON(clk->clksel_mask == 0);
- *field_mask = clk->clksel_mask;
- *src_addr = clk->clksel_reg;
- *parent_div = clkr->div;
+ *field_val = clkr->val;
- return clkr->val;
+ return clkr->div;
}
int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
{
- void __iomem *src_addr;
- u32 field_val, field_mask, reg_val, parent_div;
+ u32 field_val, v, parent_div;
- if (unlikely(clk->flags & CONFIG_PARTICIPANT))
+ if (clk->flags & CONFIG_PARTICIPANT)
return -EINVAL;
if (!clk->clksel)
return -EINVAL;
- field_val = omap2_clksel_get_src_field(&src_addr, new_parent,
- &field_mask, clk, &parent_div);
- if (src_addr == NULL)
+ parent_div = _omap2_clksel_get_src_field(new_parent, clk, &field_val);
+ if (!parent_div)
return -EINVAL;
- if (clk->usecount > 0)
- omap2_clk_disable(clk);
-
/* Set new source value (previous dividers if any in effect) */
- reg_val = __raw_readl(src_addr) & ~field_mask;
- reg_val |= (field_val << __ffs(field_mask));
- __raw_writel(reg_val, src_addr);
- wmb();
-
- if (clk->flags & DELAYED_APP && cpu_is_omap24xx()) {
- __raw_writel(OMAP24XX_VALID_CONFIG, OMAP24XX_PRCM_CLKCFG_CTRL);
- wmb();
- }
+ v = __raw_readl(clk->clksel_reg);
+ v &= ~clk->clksel_mask;
+ v |= field_val << __ffs(clk->clksel_mask);
+ __raw_writel(v, clk->clksel_reg);
+ v = __raw_readl(clk->clksel_reg); /* OCP barrier */
- clk->parent = new_parent;
+ _omap2xxx_clk_commit(clk);
- if (clk->usecount > 0)
- omap2_clk_enable(clk);
+ clk_reparent(clk, new_parent);
/* CLKSEL clocks follow their parents' rates, divided by a divisor */
clk->rate = new_parent->rate;
pr_debug("clock: set parent of %s to %s (new rate %ld)\n",
clk->name, clk->parent->name, clk->rate);
- if (unlikely(clk->flags & RATE_PROPAGATES))
- propagate_rate(clk);
-
return 0;
}
return 0;
}
- static unsigned long _dpll_compute_new_rate(unsigned long parent_rate, unsigned int m, unsigned int n)
+ static unsigned long _dpll_compute_new_rate(unsigned long parent_rate,
+ unsigned int m, unsigned int n)
{
unsigned long long num;
unsigned long target_rate,
unsigned long parent_rate)
{
- int flags = 0, carry = 0;
+ int r = 0, carry = 0;
/* Unscale m and round if necessary */
if (*m % DPLL_SCALE_FACTOR >= DPLL_ROUNDING_VAL)
if (*m < DPLL_MIN_MULTIPLIER) {
*m = DPLL_MIN_MULTIPLIER;
*new_rate = 0;
- flags = DPLL_MULT_UNDERFLOW;
+ r = DPLL_MULT_UNDERFLOW;
}
if (*new_rate == 0)
*new_rate = _dpll_compute_new_rate(parent_rate, *m, n);
- return flags;
+ return r;
}
/**
int m, n, r, e, scaled_max_m;
unsigned long scaled_rt_rp, new_rate;
int min_e = -1, min_e_m = -1, min_e_n = -1;
+ struct dpll_data *dd;
if (!clk || !clk->dpll_data)
return ~0;
+ dd = clk->dpll_data;
+
pr_debug("clock: starting DPLL round_rate for clock %s, target rate "
"%ld\n", clk->name, target_rate);
- scaled_rt_rp = target_rate / (clk->parent->rate / DPLL_SCALE_FACTOR);
- scaled_max_m = clk->dpll_data->max_multiplier * DPLL_SCALE_FACTOR;
+ scaled_rt_rp = target_rate / (dd->clk_ref->rate / DPLL_SCALE_FACTOR);
+ scaled_max_m = dd->max_multiplier * DPLL_SCALE_FACTOR;
- clk->dpll_data->last_rounded_rate = 0;
+ dd->last_rounded_rate = 0;
- for (n = clk->dpll_data->max_divider; n >= DPLL_MIN_DIVIDER; n--) {
+ for (n = dd->min_divider; n <= dd->max_divider; n++) {
+
+ /* Is the (input clk, divider) pair valid for the DPLL? */
+ r = _dpll_test_fint(clk, n);
+ if (r == DPLL_FINT_UNDERFLOW)
+ break;
+ else if (r == DPLL_FINT_INVALID)
+ continue;
/* Compute the scaled DPLL multiplier, based on the divider */
m = scaled_rt_rp * n;
/*
- * Since we're counting n down, a m overflow means we can
- * can immediately skip to the next n
+ * Since we're counting n up, a m overflow means we
+ * can bail out completely (since as n increases in
+ * the next iteration, there's no way that m can
+ * increase beyond the current m)
*/
if (m > scaled_max_m)
- continue;
+ break;
r = _dpll_test_mult(&m, n, &new_rate, target_rate,
- clk->parent->rate);
+ dd->clk_ref->rate);
+
+ /* m can't be set low enough for this n - try with a larger n */
+ if (r == DPLL_MULT_UNDERFLOW)
+ continue;
e = target_rate - new_rate;
pr_debug("clock: n = %d: m = %d: rate error is %d "
"(new_rate = %ld)\n", n, m, e, new_rate);
if (min_e == -1 ||
- min_e >= (int)(abs(e) - clk->dpll_data->rate_tolerance)) {
+ min_e >= (int)(abs(e) - dd->rate_tolerance)) {
min_e = e;
min_e_m = m;
min_e_n = n;
pr_debug("clock: found new least error %d\n", min_e);
- }
- /*
- * Since we're counting n down, a m underflow means we
- * can bail out completely (since as n decreases in
- * the next iteration, there's no way that m can
- * increase beyond the current m)
- */
- if (r & DPLL_MULT_UNDERFLOW)
- break;
+ /* We found good settings -- bail out now */
+ if (min_e <= dd->rate_tolerance)
+ break;
+ }
}
if (min_e < 0) {
return ~0;
}
- clk->dpll_data->last_rounded_m = min_e_m;
- clk->dpll_data->last_rounded_n = min_e_n;
- clk->dpll_data->last_rounded_rate =
- _dpll_compute_new_rate(clk->parent->rate, min_e_m, min_e_n);
+ dd->last_rounded_m = min_e_m;
+ dd->last_rounded_n = min_e_n;
+ dd->last_rounded_rate = _dpll_compute_new_rate(dd->clk_ref->rate,
+ min_e_m, min_e_n);
pr_debug("clock: final least error: e = %d, m = %d, n = %d\n",
min_e, min_e_m, min_e_n);
pr_debug("clock: final rate: %ld (target rate: %ld)\n",
- clk->dpll_data->last_rounded_rate, target_rate);
+ dd->last_rounded_rate, target_rate);
- return clk->dpll_data->last_rounded_rate;
+ return dd->last_rounded_rate;
}
/*-------------------------------------------------------------------------
return;
printk(KERN_INFO "Disabling unused clock \"%s\"\n", clk->name);
- _omap2_clk_disable(clk);
+ if (cpu_is_omap34xx()) {
+ omap2_clk_enable(clk);
+ omap2_clk_disable(clk);
+ } else
+ _omap2_clk_disable(clk);
}
#endif
#define VS30 (1 << 25)
#define SDVS18 (0x5 << 9)
#define SDVS30 (0x6 << 9)
+#define SDVS33 (0x7 << 9)
#define SDVSCLR 0xFFFFF1FF
#define SDVSDET 0x00000400
#define AUTOIDLE 0x1
}
#endif /* CONFIG_MMC_DEBUG */
+/*
+ * MMC controller internal state machines reset
+ *
+ * Used to reset command or data internal state machines, using respectively
+ * SRC or SRD bit of SYSCTL register
+ * Can be called from interrupt context
+ */
+static inline void mmc_omap_reset_controller_fsm(struct mmc_omap_host *host,
+ unsigned long bit)
+{
+ unsigned long i = 0;
+ unsigned long limit = (loops_per_jiffy *
+ msecs_to_jiffies(MMC_TIMEOUT_MS));
+
+ OMAP_HSMMC_WRITE(host->base, SYSCTL,
+ OMAP_HSMMC_READ(host->base, SYSCTL) | bit);
+
+ while ((OMAP_HSMMC_READ(host->base, SYSCTL) & bit) &&
+ (i++ < limit))
+ cpu_relax();
+
+ if (OMAP_HSMMC_READ(host->base, SYSCTL) & bit)
+ dev_err(mmc_dev(host->mmc),
+ "Timeout waiting on controller reset in %s\n",
+ __func__);
+}
/*
* MMC controller IRQ handler
(status & CMD_CRC)) {
if (host->cmd) {
if (status & CMD_TIMEOUT) {
- OMAP_HSMMC_WRITE(host->base, SYSCTL,
- OMAP_HSMMC_READ(host->base,
- SYSCTL) | SRC);
- while (OMAP_HSMMC_READ(host->base,
- SYSCTL) & SRC)
- ;
-
+ mmc_omap_reset_controller_fsm(host, SRC);
host->cmd->error = -ETIMEDOUT;
} else {
host->cmd->error = -EILSEQ;
}
end_cmd = 1;
}
- if (host->data)
+ if (host->data) {
mmc_dma_cleanup(host);
+ mmc_omap_reset_controller_fsm(host, SRD);
+ }
}
if ((status & DATA_TIMEOUT) ||
(status & DATA_CRC)) {
mmc_dma_cleanup(host);
else
host->data->error = -EILSEQ;
- OMAP_HSMMC_WRITE(host->base, SYSCTL,
- OMAP_HSMMC_READ(host->base,
- SYSCTL) | SRD);
- while (OMAP_HSMMC_READ(host->base,
- SYSCTL) & SRD)
- ;
+ mmc_omap_reset_controller_fsm(host, SRD);
end_trans = 1;
}
}
}
/*
- * Switch MMC operating voltage
+ * Switch MMC interface voltage ... only relevant for MMC1.
+ *
+ * MMC2 and MMC3 use fixed 1.8V levels, and maybe a transceiver.
+ * The MMC2 transceiver controls are used instead of DAT4..DAT7.
+ * Some chips, like eMMC ones, use internal transceivers.
*/
static int omap_mmc_switch_opcond(struct mmc_omap_host *host, int vdd)
{
u32 reg_val = 0;
int ret;
+ if (host->id != OMAP_MMC1_DEVID)
+ return 0;
+
/* Disable the clocks */
clk_disable(host->fclk);
clk_disable(host->iclk);
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL) & SDVSCLR);
reg_val = OMAP_HSMMC_READ(host->base, HCTL);
+
/*
* If a MMC dual voltage card is detected, the set_ios fn calls
* this fn with VDD bit set for 1.8V. Upon card removal from the
* slot, omap_mmc_set_ios sets the VDD back to 3V on MMC_POWER_OFF.
*
- * Only MMC1 supports 3.0V. MMC2 will not function if SDVS30 is
- * set in HCTL.
+ * Cope with a bit of slop in the range ... per data sheets:
+ * - "1.8V" for vdds_mmc1/vdds_mmc1a can be up to 2.45V max,
+ * but recommended values are 1.71V to 1.89V
+ * - "3.0V" for vdds_mmc1/vdds_mmc1a can be up to 3.5V max,
+ * but recommended values are 2.7V to 3.3V
+ *
+ * Board setup code shouldn't permit anything very out-of-range.
+ * TWL4030-family VMMC1 and VSIM regulators are fine (avoiding the
+ * middle range) but VSIM can't power DAT4..DAT7 at more than 3V.
*/
- if (host->id == OMAP_MMC1_DEVID && (((1 << vdd) == MMC_VDD_32_33) ||
- ((1 << vdd) == MMC_VDD_33_34)))
- reg_val |= SDVS30;
- if ((1 << vdd) == MMC_VDD_165_195)
+ if ((1 << vdd) <= MMC_VDD_23_24)
reg_val |= SDVS18;
+ else
+ reg_val |= SDVS30;
OMAP_HSMMC_WRITE(host->base, HCTL, reg_val);
{
struct mmc_omap_host *host = container_of(work, struct mmc_omap_host,
mmc_carddetect_work);
+ struct omap_mmc_slot_data *slot = &mmc_slot(host);
+
+ host->carddetect = slot->card_detect(slot->card_detect_irq);
sysfs_notify(&host->mmc->class_dev.kobj, NULL, "cover_switch");
if (host->carddetect) {
mmc_detect_change(host->mmc, (HZ * 200) / 1000);
} else {
- OMAP_HSMMC_WRITE(host->base, SYSCTL,
- OMAP_HSMMC_READ(host->base, SYSCTL) | SRD);
- while (OMAP_HSMMC_READ(host->base, SYSCTL) & SRD)
- ;
-
+ mmc_omap_reset_controller_fsm(host, SRD);
mmc_detect_change(host->mmc, (HZ * 50) / 1000);
}
}
{
struct mmc_omap_host *host = (struct mmc_omap_host *)dev_id;
- host->carddetect = mmc_slot(host).card_detect(irq);
schedule_work(&host->mmc_carddetect_work);
return IRQ_HANDLED;
case MMC_POWER_OFF:
mmc_slot(host).set_power(host->dev, host->slot_id, 0, 0);
/*
- * Reset bus voltage to 3V if it got set to 1.8V earlier.
+ * Reset interface voltage to 3V if it's 1.8V now;
+ * only relevant on MMC-1, the others always use 1.8V.
+ *
* REVISIT: If we are able to detect cards after unplugging
* a 1.8V card, this code should not be needed.
*/
+ if (host->id != OMAP_MMC1_DEVID)
+ break;
if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
int vdd = fls(host->mmc->ocr_avail) - 1;
if (omap_mmc_switch_opcond(host, vdd) != 0)
}
if (host->id == OMAP_MMC1_DEVID) {
- /* Only MMC1 can operate at 3V/1.8V */
+ /* Only MMC1 can interface at 3V without some flavor
+ * of external transceiver; but they all handle 1.8V.
+ */
if ((OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET) &&
(ios->vdd == DUAL_VOLT_OCR_BIT)) {
/*
sema_init(&host->sem, 1);
- host->iclk = clk_get(&pdev->dev, "mmchs_ick");
+ host->iclk = clk_get(&pdev->dev, "ick");
if (IS_ERR(host->iclk)) {
ret = PTR_ERR(host->iclk);
host->iclk = NULL;
goto err1;
}
- host->fclk = clk_get(&pdev->dev, "mmchs_fck");
+ host->fclk = clk_get(&pdev->dev, "fck");
if (IS_ERR(host->fclk)) {
ret = PTR_ERR(host->fclk);
host->fclk = NULL;
" level suspend\n");
}
- if (!(OMAP_HSMMC_READ(host->base, HCTL) & SDVSDET)) {
+ if (host->id == OMAP_MMC1_DEVID
+ && !(OMAP_HSMMC_READ(host->base, HCTL)
+ & SDVSDET)) {
OMAP_HSMMC_WRITE(host->base, HCTL,
OMAP_HSMMC_READ(host->base, HCTL)
& SDVSCLR);
projects / mv-sheeva.git / commitdiff