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authorBengt Jonsson <bengt.g.jonsson@stericsson.com>2011-08-12 10:28:25 +0200
committerSamuel Ortiz <sameo@linux.intel.com>2011-10-24 14:09:18 +0200
commit0b9199e3186e1998a8e066fbcf15bcf18cdbfc42 (patch)
tree9f3d880051fa9a0121f90b3e4dfd36de6bfe711f /drivers/mfd
parentmfd: Add db8500-prcmu accessors for PLL and SGA clock (diff)
downloadlinux-0b9199e3186e1998a8e066fbcf15bcf18cdbfc42.tar.xz
linux-0b9199e3186e1998a8e066fbcf15bcf18cdbfc42.zip
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>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/db8500-prcmu.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index af369995b013..28a60906f5f7 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