ARM: OMAP2: Change 24xx to use shared clock code and new reg access
This patch changes 24xx to use shared clock code and new register
access.
Note that patch adds some temporary OLD_CK defines to keep patch
more readable. These temporary defines will be removed in the next
patch. Also not all clocks are changed in this patch to limit the
size.
Also, the patch fixes few incorrect clock defines in clock24xx.h.
Signed-off-by: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/mach-omap2/clock24xx.c b/arch/arm/mach-omap2/clock24xx.c
index 5c24781..c3ccac1 100644
--- a/arch/arm/mach-omap2/clock24xx.c
+++ b/arch/arm/mach-omap2/clock24xx.c
@@ -15,6 +15,8 @@
* 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>
@@ -23,29 +25,64 @@
#include <linux/delay.h>
#include <linux/clk.h>
-#include <asm/io.h>
+#include <linux/io.h>
+#include <linux/cpufreq.h>
#include <asm/arch/clock.h>
#include <asm/arch/sram.h>
#include <asm/div64.h>
+#include <asm/bitops.h>
-#include "prcm-regs.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
-//#define DOWN_VARIABLE_DPLL 1 /* Experimental */
+/* 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 u32 curr_perf_level = PRCM_FULL_SPEED;
static struct clk *vclk;
static struct clk *sclk;
/*-------------------------------------------------------------------------
- * Omap2 specific clock functions
+ * Omap24xx specific clock functions
*-------------------------------------------------------------------------*/
+static int omap2_enable_osc_ck(struct clk *clk)
+{
+ u32 pcc;
+
+ pcc = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
+
+ __raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK,
+ OMAP24XX_PRCM_CLKSRC_CTRL);
+
+ return 0;
+}
+
+static void omap2_disable_osc_ck(struct clk *clk)
+{
+ u32 pcc;
+
+ pcc = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
+
+ __raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK,
+ OMAP24XX_PRCM_CLKSRC_CTRL);
+}
+
+#ifdef OLD_CK
/* Recalculate SYST_CLK */
static void omap2_sys_clk_recalc(struct clk * clk)
{
@@ -55,17 +92,18 @@
clk->rate = (clk->parent->rate / div);
propagate_rate(clk);
}
+#endif /* OLD_CK */
-static u32 omap2_get_dpll_rate(struct clk * tclk)
+/* 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;
- int dpll_mult, dpll_div, amult;
+ u8 amult;
- dpll_mult = (CM_CLKSEL1_PLL >> 12) & 0x03ff; /* 10 bits */
- dpll_div = (CM_CLKSEL1_PLL >> 8) & 0x0f; /* 4 bits */
- dpll_clk = (long long)tclk->parent->rate * dpll_mult;
- do_div(dpll_clk, dpll_div + 1);
- amult = CM_CLKSEL2_PLL & 0x3;
+ 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;
@@ -84,6 +122,7 @@
propagate_rate(clk);
}
+#ifdef OLD_CK
static void omap2_set_osc_ck(int enable)
{
if (enable)
@@ -91,39 +130,40 @@
else
PRCM_CLKSRC_CTRL |= 0x3 << 3;
}
+#endif /* OLD_CK */
/* Enable an APLL if off */
-static void omap2_clk_fixed_enable(struct clk *clk)
+static int omap2_clk_fixed_enable(struct clk *clk)
{
- u32 cval, i=0;
+ u32 cval, apll_mask;
- if (clk->enable_bit == 0xff) /* Parent will do it */
- return;
+ apll_mask = EN_APLL_LOCKED << clk->enable_bit;
- cval = CM_CLKEN_PLL;
+ cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
- if ((cval & (0x3 << clk->enable_bit)) == (0x3 << clk->enable_bit))
- return;
+ if ((cval & apll_mask) == apll_mask)
+ return 0; /* apll already enabled */
- cval &= ~(0x3 << clk->enable_bit);
- cval |= (0x3 << clk->enable_bit);
- CM_CLKEN_PLL = cval;
+ cval &= ~apll_mask;
+ cval |= apll_mask;
+ cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
if (clk == &apll96_ck)
- cval = (1 << 8);
+ cval = OMAP24XX_ST_96M_APLL;
else if (clk == &apll54_ck)
- cval = (1 << 6);
+ cval = OMAP24XX_ST_54M_APLL;
- while (!(CM_IDLEST_CKGEN & cval)) { /* Wait for lock */
- ++i;
- udelay(1);
- if (i == 100000) {
- printk(KERN_ERR "Clock %s didn't lock\n", clk->name);
- break;
- }
- }
+ 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;
}
+#ifdef OLD_CK
static void omap2_clk_wait_ready(struct clk *clk)
{
unsigned long reg, other_reg, st_reg;
@@ -199,20 +239,19 @@
return 0;
}
+#endif /* OLD_CK */
/* Stop APLL */
static void omap2_clk_fixed_disable(struct clk *clk)
{
u32 cval;
- if(clk->enable_bit == 0xff) /* let parent off do it */
- return;
-
- cval = CM_CLKEN_PLL;
- cval &= ~(0x3 << clk->enable_bit);
- CM_CLKEN_PLL = 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);
}
+#ifdef OLD_CK
/* Disables clock without considering parent dependencies or use count */
static void _omap2_clk_disable(struct clk *clk)
{
@@ -269,6 +308,7 @@
omap2_clk_disable(clk->parent);
}
}
+#endif /* OLD_CK */
/*
* Uses the current prcm set to tell if a rate is valid.
@@ -276,9 +316,12 @@
*/
static u32 omap2_dpll_round_rate(unsigned long target_rate)
{
- u32 high, low;
+ u32 high, low, core_clk_src;
- if ((CM_CLKSEL2_PLL & 0x3) == 1) { /* DPLL clockout */
+ 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 */
@@ -300,6 +343,7 @@
}
+#ifdef OLD_CK
/*
* Used for clocks that are part of CLKSEL_xyz governed clocks.
* REVISIT: Maybe change to use clk->enable() functions like on omap1?
@@ -486,55 +530,72 @@
return prev;
}
+#endif /* OLD_CK */
-static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
+static void omap2_dpll_recalc(struct clk *clk)
{
- u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
+ clk->rate = omap2_get_dpll_rate_24xx(clk);
+
+ propagate_rate(clk);
+}
+
+static int omap2_reprogram_dpll(struct clk *clk, unsigned long rate)
+{
+ u32 cur_rate, low, mult, div, valid_rate, done_rate;
u32 bypass = 0;
struct prcm_config tmpset;
+ const struct dpll_data *dd;
+ unsigned long flags;
int ret = -EINVAL;
local_irq_save(flags);
- cur_rate = omap2_get_dpll_rate(&dpll_ck);
- mult = CM_CLKSEL2_PLL & 0x3;
+ 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(PRCM_HALF_SPEED, 1);
+ omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
} else if ((rate == (cur_rate * 2)) && (mult == 1)) {
- omap2_reprogram_sdrc(PRCM_FULL_SPEED, 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 ((CM_CLKSEL2_PLL & 0x3) == 1)
+ if (mult == 1)
low = curr_prcm_set->dpll_speed;
else
low = curr_prcm_set->dpll_speed / 2;
- tmpset.cm_clksel1_pll = CM_CLKSEL1_PLL;
- tmpset.cm_clksel1_pll &= ~(0x3FFF << 8);
+ dd = clk->dpll_data;
+ if (!dd)
+ goto dpll_exit;
+
+ tmpset.cm_clksel1_pll = __raw_readl(dd->mult_div1_reg);
+ tmpset.cm_clksel1_pll &= ~(dd->mult_mask |
+ dd->div1_mask);
div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
- tmpset.cm_clksel2_pll = CM_CLKSEL2_PLL;
- tmpset.cm_clksel2_pll &= ~0x3;
+ 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 |= 0x2;
+ tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2;
mult = ((rate / 2) / 1000000);
- done_rate = PRCM_FULL_SPEED;
+ done_rate = CORE_CLK_SRC_DPLL_X2;
} else {
- tmpset.cm_clksel2_pll |= 0x1;
+ tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL;
mult = (rate / 1000000);
- done_rate = PRCM_HALF_SPEED;
+ done_rate = CORE_CLK_SRC_DPLL;
}
- tmpset.cm_clksel1_pll |= ((div << 8) | (mult << 12));
+ tmpset.cm_clksel1_pll |= (div << __ffs(dd->mult_mask));
+ tmpset.cm_clksel1_pll |= (mult << __ffs(dd->div1_mask));
/* Worst case */
- tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
+ 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(PRCM_FULL_SPEED, 1); /* For init_mem */
+ 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,
@@ -544,7 +605,7 @@
omap2_init_memory_params(omap2_dll_force_needed());
omap2_reprogram_sdrc(done_rate, 0);
}
- omap2_clksel_recalc(&dpll_ck);
+ omap2_dpll_recalc(&dpll_ck);
ret = 0;
dpll_exit:
@@ -552,8 +613,13 @@
return(ret);
}
-/* Just return the MPU speed */
-static void omap2_mpu_recalc(struct clk * clk)
+/**
+ * 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;
}
@@ -565,9 +631,9 @@
* 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)
+static long omap2_round_to_table_rate(struct clk *clk, unsigned long rate)
{
- struct prcm_config * ptr;
+ struct prcm_config *ptr;
long highest_rate;
if (clk != &virt_prcm_set)
@@ -576,6 +642,8 @@
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;
@@ -588,6 +656,7 @@
return highest_rate;
}
+#ifdef OLD_CK
/*
* omap2_convert_field_to_div() - turn field value into integer divider
*/
@@ -938,24 +1007,19 @@
set_parent_error:
return ret;
}
+#endif /* OLD_CK */
/* Sets basic clocks based on the specified rate */
-static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
+static int omap2_select_table_rate(struct clk *clk, unsigned long rate)
{
- u32 flags, cur_rate, done_rate, bypass = 0;
- u8 cpu_mask = 0;
+ u32 cur_rate, done_rate, bypass = 0, tmp;
struct prcm_config *prcm;
unsigned long found_speed = 0;
+ unsigned long flags;
if (clk != &virt_prcm_set)
return -EINVAL;
- /* FIXME: Change cpu_is_omap2420() to cpu_is_omap242x() */
- if (cpu_is_omap2420())
- cpu_mask = RATE_IN_242X;
- else if (cpu_is_omap2430())
- cpu_mask = RATE_IN_243X;
-
for (prcm = rate_table; prcm->mpu_speed; prcm++) {
if (!(prcm->flags & cpu_mask))
continue;
@@ -976,38 +1040,42 @@
}
curr_prcm_set = prcm;
- cur_rate = omap2_get_dpll_rate(&dpll_ck);
+ cur_rate = omap2_get_dpll_rate_24xx(&dpll_ck);
if (prcm->dpll_speed == cur_rate / 2) {
- omap2_reprogram_sdrc(PRCM_HALF_SPEED, 1);
+ omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
} else if (prcm->dpll_speed == cur_rate * 2) {
- omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
+ 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 & 0x3) == 2)
- done_rate = PRCM_FULL_SPEED;
+ 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 = PRCM_HALF_SPEED;
+ done_rate = CORE_CLK_SRC_DPLL;
/* MPU divider */
- CM_CLKSEL_MPU = prcm->cm_clksel_mpu;
+ cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);
/* dsp + iva1 div(2420), iva2.1(2430) */
- CM_CLKSEL_DSP = prcm->cm_clksel_dsp;
+ cm_write_mod_reg(prcm->cm_clksel_dsp,
+ OMAP24XX_DSP_MOD, CM_CLKSEL);
- CM_CLKSEL_GFX = prcm->cm_clksel_gfx;
+ cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);
/* Major subsystem dividers */
- CM_CLKSEL1_CORE = prcm->cm_clksel1_core;
+ 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_CLKSEL_MDM = prcm->cm_clksel_mdm;
+ cm_write_mod_reg(prcm->cm_clksel_mdm,
+ OMAP2430_MDM_MOD, CM_CLKSEL);
/* x2 to enter init_mem */
- omap2_reprogram_sdrc(PRCM_FULL_SPEED, 1);
+ omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
bypass);
@@ -1017,7 +1085,7 @@
local_irq_restore(flags);
}
- omap2_clksel_recalc(&dpll_ck);
+ omap2_dpll_recalc(&dpll_ck);
return 0;
}
@@ -1051,27 +1119,45 @@
.clk_disable_unused = omap2_clk_disable_unused,
};
-static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
+static u32 omap2_get_apll_clkin(void)
{
- u32 div, aplls, sclk = 13000000;
+ u32 aplls, sclk = 0;
- aplls = CM_CLKSEL1_PLL;
- aplls &= ((1 << 23) | (1 << 24) | (1 << 25));
- aplls >>= 23; /* Isolate field, 0,2,3 */
+ aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
+ aplls &= OMAP24XX_APLLS_CLKIN_MASK;
+ aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT;
- if (aplls == 0)
+ if (aplls == APLLS_CLKIN_19_2MHZ)
sclk = 19200000;
- else if (aplls == 2)
+ else if (aplls == APLLS_CLKIN_13MHZ)
sclk = 13000000;
- else if (aplls == 3)
+ else if (aplls == APLLS_CLKIN_12MHZ)
sclk = 12000000;
- div = PRCM_CLKSRC_CTRL;
- div &= ((1 << 7) | (1 << 6));
- div >>= sys->rate_offset;
+ return sclk;
+}
- osc->rate = sclk * div;
- sys->rate = sclk;
+static u32 omap2_get_sysclkdiv(void)
+{
+ u32 div;
+
+ div = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
+ div &= OMAP_SYSCLKDIV_MASK;
+ div >>= OMAP_SYSCLKDIV_SHIFT;
+
+ return div;
+}
+
+static 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);
}
/*
@@ -1100,8 +1186,7 @@
if (omap2_select_table_rate(&virt_prcm_set, mpurate))
printk(KERN_ERR "Could not find matching MPU rate\n");
- propagate_rate(&osc_ck); /* update main root fast */
- propagate_rate(&func_32k_ck); /* update main root slow */
+ recalculate_root_clocks();
printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
"%ld.%01ld/%ld/%ld MHz\n",
@@ -1115,13 +1200,21 @@
int __init omap2_clk_init(void)
{
struct prcm_config *prcm;
- struct clk ** clkp;
+ struct clk **clkp;
u32 clkrate;
- clk_init(&omap2_clk_functions);
- omap2_get_crystal_rate(&osc_ck, &sys_ck);
+ if (cpu_is_omap242x())
+ cpu_mask = RATE_IN_242X;
+ else if (cpu_is_omap2430())
+ cpu_mask = RATE_IN_243X;
- for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
+ clk_init(&omap2_clk_functions);
+
+ omap2_osc_clk_recalc(&osc_ck);
+ omap2_sys_clk_recalc(&sys_ck);
+
+ for (clkp = onchip_24xx_clks;
+ clkp < onchip_24xx_clks + ARRAY_SIZE(onchip_24xx_clks);
clkp++) {
if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
@@ -1136,8 +1229,10 @@
}
/* Check the MPU rate set by bootloader */
- clkrate = omap2_get_dpll_rate(&dpll_ck);
+ 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)
@@ -1145,8 +1240,7 @@
}
curr_prcm_set = prcm;
- propagate_rate(&osc_ck); /* update main root fast */
- propagate_rate(&func_32k_ck); /* update main root slow */
+ recalculate_root_clocks();
printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
"%ld.%01ld/%ld/%ld MHz\n",
@@ -1157,16 +1251,7 @@
* Only enable those clocks we will need, let the drivers
* enable other clocks as necessary
*/
- clk_enable(&sync_32k_ick);
- clk_enable(&omapctrl_ick);
-
- /* Force the APLLs always active. The clocks are idled
- * automatically by hardware. */
- clk_enable(&apll96_ck);
- clk_enable(&apll54_ck);
-
- if (cpu_is_omap2430())
- clk_enable(&sdrc_ick);
+ clk_enable_init_clocks();
/* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
vclk = clk_get(NULL, "virt_prcm_set");