[RFC PATCH 2/4] bus: ti-sysc: Add generic enable/disable functions

[Roger Quadros]

For non legacy cases, add generic sysc_enable_module()
and sysc_disable_module() functions.

Signed-off-by: Roger Quadros <rog...@ti.com>
---
 drivers/bus/ti-sysc.c | 114 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 114 insertions(+)

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 5c0dd80021cc..1e63b6265764 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -793,6 +793,112 @@ static void sysc_show_registers(struct sysc *ddata)
                buf);
 }
 
+#define SYSC_IDLE_MASK (SYSC_NR_IDLEMODES - 1)
+
+static int sysc_enable_module(struct device *dev)
+{
+       struct sysc *ddata;
+       const struct sysc_regbits *regbits;
+       u32 reg, idlemodes, best_mode;
+
+       ddata = dev_get_drvdata(dev);
+       if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV)
+               return 0;
+
+       regbits = ddata->cap->regbits;
+       reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
+
+       /* Set SIDLE mode */
+       idlemodes = ddata->cfg.sidlemodes;
+       if (!idlemodes || regbits->sidle_shift < 0)
+               goto set_midle;
+
+       best_mode = fls(ddata->cfg.sidlemodes) - 1;
+       if (best_mode > SYSC_IDLE_MASK) {
+               dev_err(dev, "%s: invalid sidlemode\n", __func__);
+               return -EINVAL;
+       }
+
+       reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
+       reg |= best_mode << regbits->sidle_shift;
+       sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
+
+set_midle:
+       /* Set MIDLE mode */
+       idlemodes = ddata->cfg.midlemodes;
+       if (!idlemodes || regbits->midle_shift < 0)
+               return 0;
+
+       best_mode = fls(ddata->cfg.midlemodes) - 1;
+       if (best_mode > SYSC_IDLE_MASK) {
+               dev_err(dev, "%s: invalid midlemode\n", __func__);
+               return -EINVAL;
+       }
+
+       reg &= ~(SYSC_IDLE_MASK << regbits->midle_shift);
+       reg |= best_mode << regbits->midle_shift;
+       sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
+
+       return 0;
+}
+
+static int sysc_disable_module(struct device *dev)
+{
+       struct sysc *ddata;
+       const struct sysc_regbits *regbits;
+       u32 reg, idlemodes, best_mode;
+
+       ddata = dev_get_drvdata(dev);
+       if (ddata->offsets[SYSC_SYSCONFIG] == -ENODEV)
+               return 0;
+
+       regbits = ddata->cap->regbits;
+       reg = sysc_read(ddata, ddata->offsets[SYSC_SYSCONFIG]);
+
+       /* Set MIDLE mode */
+       idlemodes = ddata->cfg.midlemodes;
+       if (!idlemodes || regbits->midle_shift < 0)
+               goto set_sidle;
+
+       if (idlemodes & BIT(SYSC_IDLE_SMART_WKUP)) {
+               best_mode = SYSC_IDLE_SMART_WKUP;
+       } else if (idlemodes & BIT(SYSC_IDLE_SMART)) {
+               best_mode = SYSC_IDLE_SMART;
+       } else if (idlemodes & SYSC_IDLE_FORCE) {
+               best_mode = SYSC_IDLE_FORCE;
+       } else {
+               dev_err(dev, "%s: invalid midlemode\n", __func__);
+               return -EINVAL;
+       }
+
+       reg &= ~(SYSC_IDLE_MASK << regbits->midle_shift);
+       reg |= best_mode << regbits->midle_shift;
+       sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
+
+set_sidle:
+       /* Set SIDLE mode */
+       idlemodes = ddata->cfg.sidlemodes;
+       if (!idlemodes || regbits->sidle_shift < 0)
+               return 0;
+
+       if (idlemodes & BIT(SYSC_IDLE_SMART_WKUP)) {
+               best_mode = SYSC_IDLE_SMART_WKUP;
+       } else if (idlemodes & BIT(SYSC_IDLE_SMART)) {
+               best_mode = SYSC_IDLE_SMART;
+       } else if (idlemodes & SYSC_IDLE_FORCE) {
+               best_mode = SYSC_IDLE_FORCE;
+       } else {
+               dev_err(dev, "%s: invalid sidlemode\n", __func__);
+               return -EINVAL;
+       }
+
+       reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
+       reg |= best_mode << regbits->sidle_shift;
+       sysc_write(ddata, ddata->offsets[SYSC_SYSCONFIG], reg);
+
+       return 0;
+}
+
 static int __maybe_unused sysc_runtime_suspend_legacy(struct device *dev,
                                                      struct sysc *ddata)
 {
@@ -849,6 +955,10 @@ static int __maybe_unused sysc_runtime_suspend(struct 
device *dev)
                error = sysc_runtime_suspend_legacy(dev, ddata);
                if (error)
                        return error;
+       } else {
+               error = sysc_disable_module(dev);
+               if (error)
+                       return error;
        }
 
        sysc_disable_main_clocks(ddata);
@@ -885,6 +995,10 @@ static int __maybe_unused sysc_runtime_resume(struct 
device *dev)
                error = sysc_runtime_resume_legacy(dev, ddata);
                if (error)
                        goto err_main_clocks;
+       } else {
+               error = sysc_enable_module(dev);
+               if (error)
+                       goto err_main_clocks;
        }
 
        ddata->enabled = true;
-- 
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