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Commit 0b9199e3 authored by Bengt Jonsson's avatar Bengt Jonsson Committed by Samuel Ortiz
Browse files

mfd: hwacc power state db8500-prcmu accessor 



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

Signed-off-by: default avatarBengt Jonsson <bengt.g.jonsson@stericsson.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 0837bb72

drivers/mfd/db8500-prcmu.c

+126 −0
Original line number Diff line number Diff line
@@ -1080,6 +1080,132 @@ static int request_pll(u8 clock, bool enable) 
	return r;

}



/**

 * 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