mfd: hwacc power state db8500-prcmu accessor

This implements the accessor function for hardware accelerator
power state settings.

Signed-off-by: Bengt Jonsson <bengt.g.jonsson@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 126 insertions, 0 deletions

diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index af369995b01..28a60906f5f 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -1081,6 +1081,132 @@ static int request_pll(u8 clock, bool enable)
 }
 
 /**
+ * prcmu_set_hwacc - set the power state of a h/w accelerator
+ * @hwacc_dev: The hardware accelerator (enum hw_acc_dev).
+ * @state: The new power state (enum hw_acc_state).
+ *
+ * This function sets the power state of a hardware accelerator.
+ * This function should not be called from interrupt context.
+ *
+ * NOTE! Deprecated, to be removed when all users switched over to use the
+ * regulator framework API.
+ */
+int prcmu_set_hwacc(u16 hwacc_dev, u8 state)
+{
+        int r = 0;
+        bool ram_retention = false;
+        bool enable, enable_ret;
+
+        /* check argument */
+        BUG_ON(hwacc_dev >= NUM_HW_ACC);
+
+        /* get state of switches */
+        enable = hwacc_enabled[hwacc_dev];
+        enable_ret = hwacc_ret_enabled[hwacc_dev];
+
+        /* set flag if retention is possible */
+        switch (hwacc_dev) {
+        case HW_ACC_SVAMMDSP:
+        case HW_ACC_SIAMMDSP:
+        case HW_ACC_ESRAM1:
+        case HW_ACC_ESRAM2:
+        case HW_ACC_ESRAM3:
+        case HW_ACC_ESRAM4:
+                ram_retention = true;
+                break;
+        }
+
+        /* check argument */
+        BUG_ON(state > HW_ON);
+        BUG_ON(state == HW_OFF_RAMRET && !ram_retention);
+
+        /* modify enable flags */
+        switch (state) {
+        case HW_OFF:
+                enable_ret = false;
+                enable = false;
+                break;
+        case HW_ON:
+                enable = true;
+                break;
+        case HW_OFF_RAMRET:
+                enable_ret = true;
+                enable = false;
+                break;
+        }
+
+        /* get regulator (lazy) */
+        if (hwacc_regulator[hwacc_dev] == NULL) {
+                hwacc_regulator[hwacc_dev] = regulator_get(NULL,
+                        hwacc_regulator_name[hwacc_dev]);
+                if (IS_ERR(hwacc_regulator[hwacc_dev])) {
+                        pr_err("prcmu: failed to get supply %s\n",
+                                hwacc_regulator_name[hwacc_dev]);
+                        r = PTR_ERR(hwacc_regulator[hwacc_dev]);
+                        goto out;
+                }
+        }
+
+        if (ram_retention) {
+                if (hwacc_ret_regulator[hwacc_dev] == NULL) {
+                        hwacc_ret_regulator[hwacc_dev] = regulator_get(NULL,
+                                hwacc_ret_regulator_name[hwacc_dev]);
+                        if (IS_ERR(hwacc_ret_regulator[hwacc_dev])) {
+                                pr_err("prcmu: failed to get supply %s\n",
+                                        hwacc_ret_regulator_name[hwacc_dev]);
+                                r = PTR_ERR(hwacc_ret_regulator[hwacc_dev]);
+                                goto out;
+                        }
+                }
+        }
+
+        /* set regulators */
+        if (ram_retention) {
+                if (enable_ret && !hwacc_ret_enabled[hwacc_dev]) {
+                        r = regulator_enable(hwacc_ret_regulator[hwacc_dev]);
+                        if (r < 0) {
+                                pr_err("prcmu_set_hwacc: ret enable failed\n");
+                                goto out;
+                        }
+                        hwacc_ret_enabled[hwacc_dev] = true;
+                }
+        }
+
+        if (enable && !hwacc_enabled[hwacc_dev]) {
+                r = regulator_enable(hwacc_regulator[hwacc_dev]);
+                if (r < 0) {
+                        pr_err("prcmu_set_hwacc: enable failed\n");
+                        goto out;
+                }
+                hwacc_enabled[hwacc_dev] = true;
+        }
+
+        if (!enable && hwacc_enabled[hwacc_dev]) {
+                r = regulator_disable(hwacc_regulator[hwacc_dev]);
+                if (r < 0) {
+                        pr_err("prcmu_set_hwacc: disable failed\n");
+                        goto out;
+                }
+                hwacc_enabled[hwacc_dev] = false;
+        }
+
+        if (ram_retention) {
+                if (!enable_ret && hwacc_ret_enabled[hwacc_dev]) {
+                        r = regulator_disable(hwacc_ret_regulator[hwacc_dev]);
+                        if (r < 0) {
+                                pr_err("prcmu_set_hwacc: ret disable failed\n");
+                                goto out;
+                        }
+                        hwacc_ret_enabled[hwacc_dev] = false;
+                }
+        }
+
+out:
+        return r;
+}
+EXPORT_SYMBOL(prcmu_set_hwacc);
+
+/**
  * db8500_prcmu_set_epod - set the state of a EPOD (power domain)
  * @epod_id: The EPOD to set
  * @epod_state: The new EPOD state