From: Rajendra Nayak <rnayak@xxxxxx>
SAR/ROM code restores only CORE DPLL to its original state
post wakeup from OFF mode.
The rest of the DPLL's in OMAP4 platform (MPU/IVA/ABE/USB/PER)
are saved and restored here during an OFF transition.
[nm@xxxxxx: minor cleanups]
Signed-off-by: Nishanth Menon <nm@xxxxxx>
Signed-off-by: Rajendra Nayak <rnayak@xxxxxx>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Signed-off-by: Tero Kristo <t-kristo@xxxxxx>
---
arch/arm/mach-omap2/cm44xx.h | 5 +
arch/arm/mach-omap2/dpll44xx.c | 271 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 276 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-omap2/cm44xx.h b/arch/arm/mach-omap2/cm44xx.h
index 3380bee..5fba0fa 100644
--- a/arch/arm/mach-omap2/cm44xx.h
+++ b/arch/arm/mach-omap2/cm44xx.h
@@ -23,4 +23,9 @@
#define OMAP4_CM_CLKSTCTRL 0x0000
#define OMAP4_CM_STATICDEP 0x0004
+#ifndef __ASSEMBLER__
+extern void omap4_dpll_prepare_off(void);
+extern void omap4_dpll_resume_off(void);
+#endif
+
#endif
diff --git a/arch/arm/mach-omap2/dpll44xx.c b/arch/arm/mach-omap2/dpll44xx.c
index 9c6a296..b411d3b 100644
--- a/arch/arm/mach-omap2/dpll44xx.c
+++ b/arch/arm/mach-omap2/dpll44xx.c
@@ -14,6 +14,7 @@
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/bitops.h>
+#include <linux/delay.h>
#include <plat/cpu.h>
#include <plat/clock.h>
@@ -21,6 +22,96 @@
#include "clock.h"
#include "clock44xx.h"
#include "cm-regbits-44xx.h"
+#include "cm1_44xx.h"
+#include "cm2_44xx.h"
+#include "prcm44xx.h"
+#include "cminst44xx.h"
+#include "cm44xx.h"
+
+#define MAX_DPLL_WAIT_TRIES 1000000
+
+struct dpll_reg {
+ u16 offset;
+ u32 val;
+};
+
+struct omap4_dpll_regs {
+ char *name;
+ u32 mod_partition;
+ u32 mod_inst;
+ struct dpll_reg clkmode;
+ struct dpll_reg autoidle;
+ struct dpll_reg idlest;
+ struct dpll_reg clksel;
+ struct dpll_reg div_m2;
+ struct dpll_reg div_m3;
+ struct dpll_reg div_m4;
+ struct dpll_reg div_m5;
+ struct dpll_reg div_m6;
+ struct dpll_reg div_m7;
+ struct dpll_reg clkdcoldo;
+};
+
+static struct omap4_dpll_regs dpll_regs[] = {
+ /* MPU DPLL */
+ { .name = "mpu",
+ .mod_partition = OMAP4430_CM1_PARTITION,
+ .mod_inst = OMAP4430_CM1_CKGEN_INST,
+ .clkmode = {.offset = OMAP4_CM_CLKMODE_DPLL_MPU_OFFSET},
+ .autoidle = {.offset = OMAP4_CM_AUTOIDLE_DPLL_MPU_OFFSET},
+ .idlest = {.offset = OMAP4_CM_IDLEST_DPLL_MPU_OFFSET},
+ .clksel = {.offset = OMAP4_CM_CLKSEL_DPLL_MPU_OFFSET},
+ .div_m2 = {.offset = OMAP4_CM_DIV_M2_DPLL_MPU_OFFSET},
+ },
+ /* IVA DPLL */
+ { .name = "iva",
+ .mod_partition = OMAP4430_CM1_PARTITION,
+ .mod_inst = OMAP4430_CM1_CKGEN_INST,
+ .clkmode = {.offset = OMAP4_CM_CLKMODE_DPLL_IVA_OFFSET},
+ .autoidle = {.offset = OMAP4_CM_AUTOIDLE_DPLL_IVA_OFFSET},
+ .idlest = {.offset = OMAP4_CM_IDLEST_DPLL_IVA_OFFSET},
+ .clksel = {.offset = OMAP4_CM_CLKSEL_DPLL_IVA_OFFSET},
+ .div_m4 = {.offset = OMAP4_CM_DIV_M4_DPLL_IVA_OFFSET},
+ .div_m5 = {.offset = OMAP4_CM_DIV_M5_DPLL_IVA_OFFSET},
+ },
+ /* ABE DPLL */
+ { .name = "abe",
+ .mod_partition = OMAP4430_CM1_PARTITION,
+ .mod_inst = OMAP4430_CM1_CKGEN_INST,
+ .clkmode = {.offset = OMAP4_CM_CLKMODE_DPLL_ABE_OFFSET},
+ .autoidle = {.offset = OMAP4_CM_AUTOIDLE_DPLL_ABE_OFFSET},
+ .idlest = {.offset = OMAP4_CM_IDLEST_DPLL_ABE_OFFSET},
+ .clksel = {.offset = OMAP4_CM_CLKSEL_DPLL_ABE_OFFSET},
+ .div_m2 = {.offset = OMAP4_CM_DIV_M2_DPLL_ABE_OFFSET},
+ .div_m3 = {.offset = OMAP4_CM_DIV_M3_DPLL_ABE_OFFSET},
+ },
+ /* USB DPLL */
+ { .name = "usb",
+ .mod_partition = OMAP4430_CM2_PARTITION,
+ .mod_inst = OMAP4430_CM2_CKGEN_INST,
+ .clkmode = {.offset = OMAP4_CM_CLKMODE_DPLL_USB_OFFSET},
+ .autoidle = {.offset = OMAP4_CM_AUTOIDLE_DPLL_USB_OFFSET},
+ .idlest = {.offset = OMAP4_CM_IDLEST_DPLL_USB_OFFSET},
+ .clksel = {.offset = OMAP4_CM_CLKSEL_DPLL_USB_OFFSET},
+ .div_m2 = {.offset = OMAP4_CM_DIV_M2_DPLL_USB_OFFSET},
+ .clkdcoldo = {.offset = OMAP4_CM_CLKDCOLDO_DPLL_USB_OFFSET},
+ },
+ /* PER DPLL */
+ { .name = "per",
+ .mod_partition = OMAP4430_CM2_PARTITION,
+ .mod_inst = OMAP4430_CM2_CKGEN_INST,
+ .clkmode = {.offset = OMAP4_CM_CLKMODE_DPLL_PER_OFFSET},
+ .autoidle = {.offset = OMAP4_CM_AUTOIDLE_DPLL_PER_OFFSET},
+ .idlest = {.offset = OMAP4_CM_IDLEST_DPLL_PER_OFFSET},
+ .clksel = {.offset = OMAP4_CM_CLKSEL_DPLL_PER_OFFSET},
+ .div_m2 = {.offset = OMAP4_CM_DIV_M2_DPLL_PER_OFFSET},
+ .div_m3 = {.offset = OMAP4_CM_DIV_M3_DPLL_PER_OFFSET},
+ .div_m4 = {.offset = OMAP4_CM_DIV_M4_DPLL_PER_OFFSET},
+ .div_m5 = {.offset = OMAP4_CM_DIV_M5_DPLL_PER_OFFSET},
+ .div_m6 = {.offset = OMAP4_CM_DIV_M6_DPLL_PER_OFFSET},
+ .div_m7 = {.offset = OMAP4_CM_DIV_M7_DPLL_PER_OFFSET},
+ },
+};
/* Supported only on OMAP4 */
int omap4_dpllmx_gatectrl_read(struct clk *clk)
@@ -151,3 +242,183 @@ long omap4_dpll_regm4xen_round_rate(struct clk *clk, unsigned long target_rate)
return clk->dpll_data->last_rounded_rate;
}
+
+/**
+ * omap4_dpll_read_reg - reads DPLL register value
+ * @dpll_reg: DPLL register to read
+ *
+ * Reads the value of a single DPLL register.
+ */
+static inline u32 omap4_dpll_read_reg(struct omap4_dpll_regs *dpll_reg,
+ struct dpll_reg *tuple)
+{
+ if (tuple->offset)
+ return omap4_cminst_read_inst_reg(dpll_reg->mod_partition,
+ dpll_reg->mod_inst,
+ tuple->offset);
+ return 0;
+}
+
+/**
+ * omap4_dpll_store_reg - stores DPLL register value to memory location
+ * @dpll_reg: DPLL register to save
+ * @tuple: save address
+ *
+ * Saves a single DPLL register content to memory location defined by
+ * @tuple before entering device off mode.
+ */
+static inline void omap4_dpll_store_reg(struct omap4_dpll_regs *dpll_reg,
+ struct dpll_reg *tuple)
+{
+ tuple->val = omap4_dpll_read_reg(dpll_reg, tuple);
+}
+
+/**
+ * omap4_dpll_prepare_off - stores DPLL settings before off mode
+ *
+ * Saves all DPLL register settings. This must be called before
+ * entering device off.
+ */
+void omap4_dpll_prepare_off(void)
+{
+ u32 i;
+ struct omap4_dpll_regs *dpll_reg = dpll_regs;
+
+ for (i = 0; i < ARRAY_SIZE(dpll_regs); i++, dpll_reg++) {
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->clkmode);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->autoidle);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->clksel);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->div_m2);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->div_m3);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->div_m4);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->div_m5);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->div_m6);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->div_m7);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->clkdcoldo);
+ omap4_dpll_store_reg(dpll_reg, &dpll_reg->idlest);
+ }
+}
+
+/**
+ * omap4_dpll_print_reg - dump out a single DPLL register value
+ * @dpll_reg: register to dump
+ * @name: name of the register
+ * @tuple: content of the register
+ *
+ * Helper dump function to print out a DPLL register value in case
+ * of restore failures.
+ */
+static void omap4_dpll_print_reg(struct omap4_dpll_regs *dpll_reg, char *name,
+ struct dpll_reg *tuple)
+{
+ if (tuple->offset)
+ pr_warn("%s - Address offset = 0x%08x, value=0x%08x\n", name,
+ tuple->offset, tuple->val);
+}
+
+/*
+ * omap4_dpll_dump_regs - dump out DPLL registers
+ * @dpll_reg: DPLL to dump
+ *
+ * Dump out the contents of the registers for a DPLL. Called if a
+ * restore for DPLL fails to lock.
+ */
+static void omap4_dpll_dump_regs(struct omap4_dpll_regs *dpll_reg)
+{
+ pr_warn("%s: Unable to lock dpll %s[part=%x inst=%x]:\n",
+ __func__, dpll_reg->name, dpll_reg->mod_partition,
+ dpll_reg->mod_inst);
+ omap4_dpll_print_reg(dpll_reg, "clksel", &dpll_reg->clksel);
+ omap4_dpll_print_reg(dpll_reg, "div_m2", &dpll_reg->div_m2);
+ omap4_dpll_print_reg(dpll_reg, "div_m3", &dpll_reg->div_m3);
+ omap4_dpll_print_reg(dpll_reg, "div_m4", &dpll_reg->div_m4);
+ omap4_dpll_print_reg(dpll_reg, "div_m5", &dpll_reg->div_m5);
+ omap4_dpll_print_reg(dpll_reg, "div_m6", &dpll_reg->div_m6);
+ omap4_dpll_print_reg(dpll_reg, "div_m7", &dpll_reg->div_m7);
+ omap4_dpll_print_reg(dpll_reg, "clkdcoldo", &dpll_reg->clkdcoldo);
+ omap4_dpll_print_reg(dpll_reg, "clkmode", &dpll_reg->clkmode);
+ omap4_dpll_print_reg(dpll_reg, "autoidle", &dpll_reg->autoidle);
+ if (dpll_reg->idlest.offset)
+ pr_warn("idlest - Address offset = 0x%08x, before val=0x%08x"
+ " after = 0x%08x\n", dpll_reg->idlest.offset,
+ dpll_reg->idlest.val,
+ omap4_dpll_read_reg(dpll_reg, &dpll_reg->idlest));
+}
+
+/**
+ * omap4_wait_dpll_lock - wait for a DPLL lock
+ * @dpll_reg: DPLL to wait for
+ *
+ * Waits for a DPLL lock after restore.
+ */
+static void omap4_wait_dpll_lock(struct omap4_dpll_regs *dpll_reg)
+{
+ int j = 0;
+ u32 status;
+
+ /* Return if we dont need to lock. */
+ if ((dpll_reg->clkmode.val & OMAP4430_DPLL_EN_MASK) !=
+ DPLL_LOCKED << OMAP4430_DPLL_EN_SHIFT)
+ return;
+
+ while (1) {
+ status = (omap4_dpll_read_reg(dpll_reg, &dpll_reg->idlest)
+ & OMAP4430_ST_DPLL_CLK_MASK)
+ >> OMAP4430_ST_DPLL_CLK_SHIFT;
+ if (status == 0x1)
+ break;
+ if (j == MAX_DPLL_WAIT_TRIES) {
+ /* If we are unable to lock, warn and move on.. */
+ omap4_dpll_dump_regs(dpll_reg);
+ break;
+ }
+ j++;
+ udelay(1);
+ }
+}
+
+/**
+ * omap4_dpll_restore_reg - restores a single register for a DPLL
+ * @dpll_reg: DPLL to restore
+ * @tuple: register value to restore
+ *
+ * Restores a single register for a DPLL.
+ */
+static inline void omap4_dpll_restore_reg(struct omap4_dpll_regs *dpll_reg,
+ struct dpll_reg *tuple)
+{
+ if (tuple->offset)
+ omap4_cminst_write_inst_reg(tuple->val, dpll_reg->mod_partition,
+ dpll_reg->mod_inst, tuple->offset);
+}
+
+/**
+ * omap4_dpll_resume_off - restore DPLL settings after device off
+ *
+ * Restores all DPLL settings. Must be called after wakeup from device
+ * off.
+ */
+void omap4_dpll_resume_off(void)
+{
+ u32 i;
+ struct omap4_dpll_regs *dpll_reg = dpll_regs;
+
+ for (i = 0; i < ARRAY_SIZE(dpll_regs); i++, dpll_reg++) {
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->clksel);
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->div_m2);
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->div_m3);
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->div_m4);
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->div_m5);
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->div_m6);
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->div_m7);
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->clkdcoldo);
+
+ /* Restore clkmode after the above registers are restored */
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->clkmode);
+
+ omap4_wait_dpll_lock(dpll_reg);
+
+ /* Restore autoidle settings after the dpll is locked */
+ omap4_dpll_restore_reg(dpll_reg, &dpll_reg->autoidle);
+ }
+}
--
1.7.4.1
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