#include <asm/div64.h>
#include "memory.h"
+#include "sdrc.h"
#include "clock.h"
-#include "clock24xx.h"
#include "prm.h"
#include "prm_regbits_24xx.h"
#include "cm.h"
#undef DEBUG
-/* 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 MAX_PLL_LOCK_WAIT 100000
-//#define DOWN_VARIABLE_DPLL 1 /* Experimental */
-
-static struct prcm_config *curr_prcm_set;
-static struct clk *vclk;
-static struct clk *sclk;
-static u8 cpu_mask;
+u8 cpu_mask;
/*-------------------------------------------------------------------------
* Omap2 specific clock functions
*-------------------------------------------------------------------------*/
-static inline u8 mask_to_shift(u32 mask)
+u8 mask_to_shift(u32 mask)
{
return ffs(mask) - 1;
}
* register and determine what its parent is currently set to. Update the
* clk->parent field with the appropriate clk ptr.
*/
-static void omap2_init_clksel_parent(struct clk *clk)
+void omap2_init_clksel_parent(struct clk *clk)
{
const struct clksel *clks;
const struct clksel_rate *clkr;
}
/* Returns the DPLL rate */
-static u32 omap2_get_dpll_rate(struct clk *clk)
+u32 omap2_get_dpll_rate(struct clk *clk)
{
long long dpll_clk;
u32 dpll_mult, dpll_div, dpll;
return dpll_clk;
}
-/* This actually returns the rate of core_ck, not dpll_ck. */
-static u32 omap2_get_dpll_rate_24xx(struct clk *tclk)
-{
- long long dpll_clk;
- u8 amult;
-
- dpll_clk = omap2_get_dpll_rate(tclk);
-
- amult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
- amult &= OMAP24XX_CORE_CLK_SRC_MASK;
- dpll_clk *= amult;
-
- return dpll_clk;
-}
-
/*
* Used for clocks that have the same value as the parent clock,
* divided by some factor
*/
-static void omap2_fixed_divisor_recalc(struct clk *clk)
+void omap2_fixed_divisor_recalc(struct clk *clk)
{
WARN_ON(!clk->fixed_div);
propagate_rate(clk);
}
-static int omap2_enable_osc_ck(struct clk *clk)
-{
- u32 pcc;
-
- pcc = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
-
- prm_write_reg(pcc & ~OMAP_AUTOEXTCLKMODE_MASK,
- OMAP24XX_PRCM_CLKSRC_CTRL);
-
- return 0;
-}
-
-static void omap2_disable_osc_ck(struct clk *clk)
-{
- u32 pcc;
-
- pcc = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
-
- prm_write_reg(pcc | OMAP_AUTOEXTCLKMODE_MASK,
- OMAP24XX_PRCM_CLKSRC_CTRL);
-}
-
/*
* omap2_wait_clock_ready - wait for PLL to lock
*
* Returns 1 if the PLL locked, 0 if it failed to lock.
*/
-static int omap2_wait_clock_ready(void __iomem *reg, u32 cval, const char *name)
+int omap2_wait_clock_ready(void __iomem *reg, u32 cval, const char *name)
{
int i = 0;
};
-/* 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_CLK;
-
- 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;
-}
-
static void omap2_clk_wait_ready(struct clk *clk)
{
void __iomem *reg, *other_reg, *st_reg;
/* 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)
+int _omap2_clk_enable(struct clk *clk)
{
u32 regval32;
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);
-}
-
/* Disables clock without considering parent dependencies or use count */
-static void _omap2_clk_disable(struct clk *clk)
+void _omap2_clk_disable(struct clk *clk)
{
u32 regval32;
wmb();
}
-static int omap2_clk_enable(struct clk *clk)
+void omap2_clk_disable(struct clk *clk)
+{
+ if (clk->usecount > 0 && !(--clk->usecount)) {
+ _omap2_clk_disable(clk);
+ if (likely((u32)clk->parent))
+ omap2_clk_disable(clk->parent);
+ }
+}
+
+int omap2_clk_enable(struct clk *clk)
{
int ret = 0;
return ret;
}
-static void omap2_clk_disable(struct clk *clk)
-{
- if (clk->usecount > 0 && !(--clk->usecount)) {
- _omap2_clk_disable(clk);
- if (likely((u32)clk->parent))
- omap2_clk_disable(clk->parent);
- }
-}
-
-/*
- * 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 u32 omap2_dpll_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 void omap2_dpll_recalc(struct clk *clk)
-{
- clk->rate = omap2_get_dpll_rate_24xx(clk);
-
- propagate_rate(clk);
-}
-
/*
* Used for clocks that are part of CLKSEL_xyz governed clocks.
* REVISIT: Maybe change to use clk->enable() functions like on omap1?
*/
-static void omap2_clksel_recalc(struct clk * clk)
+void omap2_clksel_recalc(struct clk *clk)
{
u32 div = 0;
* the element associated with the supplied parent clock address.
* Returns a pointer to the struct clksel on success or NULL on error.
*/
-const static struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
- struct clk *src_clk)
+const struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
+ struct clk *src_clk)
{
const struct clksel *clks;
*
* Returns the rounded clock rate or returns 0xffffffff on error.
*/
-static u32 omap2_clksel_round_rate_div(struct clk *clk,
- unsigned long target_rate,
- u32 *new_div)
+u32 omap2_clksel_round_rate_div(struct clk *clk, unsigned long target_rate,
+ u32 *new_div)
{
unsigned long test_rate;
const struct clksel *clks;
*
* Returns the rounded clock rate or returns 0xffffffff on error.
*/
-static long omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate)
+long omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate)
{
u32 new_div;
/* Given a clock and a rate apply a clock specific rounding function */
-static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
+long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
{
if (clk->round_rate != 0)
return clk->round_rate(clk, rate);
return clk->rate;
}
-static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
-{
- u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
- u32 bypass = 0;
- struct prcm_config tmpset;
- const struct dpll_data *dd;
- int ret = -EINVAL;
-
- local_irq_save(flags);
- cur_rate = omap2_get_dpll_rate_24xx(&dpll_ck);
- mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
- mult &= OMAP24XX_CORE_CLK_SRC_MASK;
-
- if ((rate == (cur_rate / 2)) && (mult == 2)) {
- omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
- } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
- omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
- } else if (rate != cur_rate) {
- valid_rate = omap2_dpll_round_rate(rate);
- if (valid_rate != rate)
- goto dpll_exit;
-
- if (mult == 1)
- low = curr_prcm_set->dpll_speed;
- else
- low = curr_prcm_set->dpll_speed / 2;
-
- dd = clk->dpll_data;
- if (!dd)
- goto dpll_exit;
-
- tmpset.cm_clksel1_pll = cm_read_reg(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 << mask_to_shift(dd->mult_mask));
- tmpset.cm_clksel1_pll |= (mult << mask_to_shift(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;
-
- omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); /* For init_mem */
-
- /* Force dll lock mode */
- omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
- bypass);
-
- /* Errata: ret dll entry state */
- omap2_init_memory_params(omap2_dll_force_needed());
- omap2_reprogram_sdrc(done_rate, 0);
- }
- omap2_dpll_recalc(&dpll_ck);
- ret = 0;
-
-dpll_exit:
- local_irq_restore(flags);
- return(ret);
-}
-
-/**
- * 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 void omap2_table_mpu_recalc(struct clk *clk)
-{
- clk->rate = 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;
-}
-
/**
* omap2_clksel_to_divisor() - turn clksel field value into integer divider
* @clk: OMAP struct clk to use
* field value should be pre-masked and shifted down so the LSB is at bit 0
* before calling. Returns 0 on error
*/
-static u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val)
+u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val)
{
const struct clksel *clks;
const struct clksel_rate *clkr;
* find the corresponding register field value. The return register value is
* the value before left-shifting. Returns 0xffffffff on error
*/
-static u32 omap2_divisor_to_clksel(struct clk *clk, u32 div)
+u32 omap2_divisor_to_clksel(struct clk *clk, u32 div)
{
const struct clksel *clks;
const struct clksel_rate *clkr;
*
* Returns the address of the clksel register upon success or NULL on error.
*/
-static void __iomem *omap2_get_clksel(struct clk *clk, u32 *field_mask)
+void __iomem *omap2_get_clksel(struct clk *clk, u32 *field_mask)
{
if (unlikely((clk->clksel_reg == 0) || (clk->clksel_mask == 0)))
return NULL;
*
* Returns the integer divisor upon success or 0 on error.
*/
-static u32 omap2_clksel_get_divisor(struct clk *clk)
+u32 omap2_clksel_get_divisor(struct clk *clk)
{
u32 field_mask, field_val;
void __iomem *div_addr;
return omap2_clksel_to_divisor(clk, field_val);
}
-static int omap2_clksel_set_rate(struct clk *clk, unsigned long rate)
+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;
/* Set the clock rate for a clock source */
-static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
+int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
{
int ret = -EINVAL;
return clkr->val;
}
-static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
+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;
return 0;
}
-/* Sets basic clocks based on the specified rate */
-static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
-{
- u32 flags, cur_rate, done_rate, bypass = 0, tmp;
- struct prcm_config *prcm;
- unsigned long found_speed = 0;
-
- 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 = omap2_get_dpll_rate_24xx(&dpll_ck);
-
- if (prcm->dpll_speed == cur_rate / 2) {
- omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
- } else if (prcm->dpll_speed == cur_rate * 2) {
- omap2_reprogram_sdrc(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 init_mem */
- omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
-
- omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
- bypass);
-
- omap2_init_memory_params(omap2_dll_force_needed());
- omap2_reprogram_sdrc(done_rate, 0);
-
- local_irq_restore(flags);
- }
- omap2_dpll_recalc(&dpll_ck);
-
- return 0;
-}
-
/*-------------------------------------------------------------------------
* Omap2 clock reset and init functions
*-------------------------------------------------------------------------*/
#ifdef CONFIG_OMAP_RESET_CLOCKS
-static void __init omap2_clk_disable_unused(struct clk *clk)
+void __init omap2_clk_disable_unused(struct clk *clk)
{
u32 regval32;
printk(KERN_INFO "Disabling unused clock \"%s\"\n", clk->name);
_omap2_clk_disable(clk);
}
-#else
-#define omap2_clk_disable_unused NULL
#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,
-};
-
-static u32 omap2_get_apll_clkin(void)
-{
- u32 aplls, sclk = 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)
- sclk = 19200000;
- else if (aplls == APLLS_CLKIN_13MHZ)
- sclk = 13000000;
- else if (aplls == APLLS_CLKIN_12MHZ)
- sclk = 12000000;
-
- return sclk;
-}
-
-static u32 omap2_get_sysclkdiv(void)
-{
- u32 div;
-
- div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
- div &= OMAP_SYSCLKDIV_MASK;
- div >>= OMAP_SYSCLKDIV_SHIFT;
-
- return div;
-}
-
-static void omap2_osc_clk_recalc(struct clk *clk)
-{
- clk->rate = omap2_get_apll_clkin() * omap2_get_sysclkdiv();
- propagate_rate(clk);
-}
-
-static void omap2_sys_clk_recalc(struct clk *clk)
-{
- clk->rate = clk->parent->rate / omap2_get_sysclkdiv();
- propagate_rate(clk);
-}
-
-/*
- * 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 (omap2_select_table_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 clk ** clkp;
- u32 clkrate;
-
- if (cpu_is_omap242x())
- cpu_mask = RATE_IN_242X;
- else if (cpu_is_omap2430())
- cpu_mask = RATE_IN_243X;
-
- clk_init(&omap2_clk_functions);
-
- omap2_osc_clk_recalc(&osc_ck);
-
- for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
- clkp++) {
-
- if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
- clk_register(*clkp);
- continue;
- }
-
- if ((*clkp)->flags & CLOCK_IN_OMAP243X && (cpu_is_omap2430() || cpu_is_omap34xx())) {
- clk_register(*clkp);
- continue;
- }
- }
-
- /* 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;
-
- 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;
-}
--- /dev/null
+/*
+ * linux/arch/arm/mach-omap2/clock.c
+ *
+ * Copyright (C) 2005 Texas Instruments Inc.
+ * Richard Woodruff <r-woodruff2@ti.com>
+ * Created for OMAP2.
+ *
+ * Cleaned up and modified to use omap shared clock framework by
+ * Tony Lindgren <tony@atomide.com>
+ *
+ * Based on omap1 clock.c, Copyright (C) 2004 - 2005 Nokia corporation
+ * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
+ *
+ * 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.
+ */
+#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 <asm/arch/clock.h>
+#include <asm/arch/sram.h>
+#include <asm/div64.h>
+
+#include "memory.h"
+#include "clock.h"
+#include "clock24xx.h"
+#include "prm.h"
+#include "prm_regbits_24xx.h"
+#include "cm.h"
+#include "cm_regbits_24xx.h"
+
+#undef DEBUG
+
+/* 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
+ *-------------------------------------------------------------------------*/
+
+/* This actually returns the rate of core_ck, not dpll_ck. */
+static u32 omap2_get_dpll_rate_24xx(struct clk *tclk)
+{
+ long long dpll_clk;
+ u8 amult;
+
+ dpll_clk = omap2_get_dpll_rate(tclk);
+
+ amult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
+ amult &= OMAP24XX_CORE_CLK_SRC_MASK;
+ dpll_clk *= amult;
+
+ return dpll_clk;
+}
+
+static int omap2_enable_osc_ck(struct clk *clk)
+{
+ u32 pcc;
+
+ pcc = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
+
+ prm_write_reg(pcc & ~OMAP_AUTOEXTCLKMODE_MASK,
+ OMAP24XX_PRCM_CLKSRC_CTRL);
+
+ return 0;
+}
+
+static void omap2_disable_osc_ck(struct clk *clk)
+{
+ u32 pcc;
+
+ pcc = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
+
+ prm_write_reg(pcc | OMAP_AUTOEXTCLKMODE_MASK,
+ OMAP24XX_PRCM_CLKSRC_CTRL);
+}
+
+/* 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_CLK;
+
+ 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);
+}
+
+/*
+ * 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 u32 omap2_dpll_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 void omap2_dpll_recalc(struct clk *clk)
+{
+ clk->rate = omap2_get_dpll_rate_24xx(clk);
+
+ propagate_rate(clk);
+}
+
+static int omap2_reprogram_dpll(struct clk *clk, unsigned long rate)
+{
+ u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
+ u32 bypass = 0;
+ struct prcm_config tmpset;
+ const struct dpll_data *dd;
+ int ret = -EINVAL;
+
+ local_irq_save(flags);
+ cur_rate = omap2_get_dpll_rate_24xx(&dpll_ck);
+ mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
+ mult &= OMAP24XX_CORE_CLK_SRC_MASK;
+
+ if ((rate == (cur_rate / 2)) && (mult == 2)) {
+ omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
+ } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
+ omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
+ } else if (rate != cur_rate) {
+ valid_rate = omap2_dpll_round_rate(rate);
+ if (valid_rate != rate)
+ goto dpll_exit;
+
+ if (mult == 1)
+ low = curr_prcm_set->dpll_speed;
+ else
+ low = curr_prcm_set->dpll_speed / 2;
+
+ dd = clk->dpll_data;
+ if (!dd)
+ goto dpll_exit;
+
+ tmpset.cm_clksel1_pll = cm_read_reg(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 << mask_to_shift(dd->mult_mask));
+ tmpset.cm_clksel1_pll |= (mult << mask_to_shift(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;
+
+ omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); /* For init_mem */
+
+ /* Force dll lock mode */
+ omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
+ bypass);
+
+ /* Errata: ret dll entry state */
+ omap2_init_memory_params(omap2_dll_force_needed());
+ omap2_reprogram_sdrc(done_rate, 0);
+ }
+ omap2_dpll_recalc(&dpll_ck);
+ ret = 0;
+
+dpll_exit:
+ local_irq_restore(flags);
+ return(ret);
+}
+
+/**
+ * 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 void omap2_table_mpu_recalc(struct clk *clk)
+{
+ clk->rate = 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 flags, cur_rate, done_rate, bypass = 0, tmp;
+ struct prcm_config *prcm;
+ unsigned long found_speed = 0;
+
+ 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 = omap2_get_dpll_rate_24xx(&dpll_ck);
+
+ if (prcm->dpll_speed == cur_rate / 2) {
+ omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
+ } else if (prcm->dpll_speed == cur_rate * 2) {
+ omap2_reprogram_sdrc(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 init_mem */
+ omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
+
+ omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
+ bypass);
+
+ omap2_init_memory_params(omap2_dll_force_needed());
+ omap2_reprogram_sdrc(done_rate, 0);
+
+ local_irq_restore(flags);
+ }
+ omap2_dpll_recalc(&dpll_ck);
+
+ return 0;
+}
+
+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,
+};
+
+static u32 omap2_get_apll_clkin(void)
+{
+ u32 aplls, sclk = 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)
+ sclk = 19200000;
+ else if (aplls == APLLS_CLKIN_13MHZ)
+ sclk = 13000000;
+ else if (aplls == APLLS_CLKIN_12MHZ)
+ sclk = 12000000;
+
+ return sclk;
+}
+
+static u32 omap2_get_sysclkdiv(void)
+{
+ u32 div;
+
+ div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
+ div &= OMAP_SYSCLKDIV_MASK;
+ div >>= OMAP_SYSCLKDIV_SHIFT;
+
+ return div;
+}
+
+static void omap2_osc_clk_recalc(struct clk *clk)
+{
+ clk->rate = omap2_get_apll_clkin() * omap2_get_sysclkdiv();
+ propagate_rate(clk);
+}
+
+static void omap2_sys_clk_recalc(struct clk *clk)
+{
+ clk->rate = clk->parent->rate / omap2_get_sysclkdiv();
+ propagate_rate(clk);
+}
+
+/*
+ * 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 (omap2_select_table_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 clk **clkp;
+ u32 clkrate;
+
+ if (cpu_is_omap242x())
+ cpu_mask = RATE_IN_242X;
+ else if (cpu_is_omap2430())
+ cpu_mask = RATE_IN_243X;
+
+ clk_init(&omap2_clk_functions);
+
+ omap2_osc_clk_recalc(&osc_ck);
+
+ for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
+ clkp++) {
+
+ if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
+ clk_register(*clkp);
+ continue;
+ }
+
+ if ((*clkp)->flags & CLOCK_IN_OMAP243X && (cpu_is_omap2430() || cpu_is_omap34xx())) {
+ clk_register(*clkp);
+ continue;
+ }
+ }
+
+ /* 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;
+
+ 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;
+}
projects / linux-2.6-omap-h63xx.git / commitdiff