[linux-2.6-block.git] / arch / arm / mach-omap2 / vp.c

#include <linux/kernel.h>
#include <linux/init.h>

#include "common.h"

#include "voltage.h"
#include "vp.h"
#include "prm-regbits-34xx.h"
#include "prm-regbits-44xx.h"
#include "prm44xx.h"

static u32 _vp_set_init_voltage(struct voltagedomain *voltdm, u32 volt)
{
	struct omap_vp_instance *vp = voltdm->vp;
	u32 vpconfig;
	char vsel;

	vsel = voltdm->pmic->uv_to_vsel(volt);

	vpconfig = voltdm->read(vp->vpconfig);
	vpconfig &= ~(vp->common->vpconfig_initvoltage_mask |
		      vp->common->vpconfig_forceupdate |
		      vp->common->vpconfig_initvdd);
	vpconfig |= vsel << __ffs(vp->common->vpconfig_initvoltage_mask);
	voltdm->write(vpconfig, vp->vpconfig);

	/* Trigger initVDD value copy to voltage processor */
	voltdm->write((vpconfig | vp->common->vpconfig_initvdd),
		       vp->vpconfig);

	/* Clear initVDD copy trigger bit */
	voltdm->write(vpconfig, vp->vpconfig);

	return vpconfig;
}

/* Generic voltage init functions */
void __init omap_vp_init(struct voltagedomain *voltdm)
{
	struct omap_vp_instance *vp = voltdm->vp;
	u32 val, sys_clk_rate, timeout, waittime;
	u32 vddmin, vddmax, vstepmin, vstepmax;

	if (!voltdm->read || !voltdm->write) {
		pr_err("%s: No read/write API for accessing vdd_%s regs\n",
			__func__, voltdm->name);
		return;
	}

	vp->enabled = false;

	/* Divide to avoid overflow */
	sys_clk_rate = voltdm->sys_clk.rate / 1000;

	timeout = (sys_clk_rate * voltdm->pmic->vp_timeout_us) / 1000;
	vddmin = voltdm->pmic->vp_vddmin;
	vddmax = voltdm->pmic->vp_vddmax;

	waittime = ((voltdm->pmic->step_size / voltdm->pmic->slew_rate) *
		    sys_clk_rate) / 1000;
	vstepmin = voltdm->pmic->vp_vstepmin;
	vstepmax = voltdm->pmic->vp_vstepmax;

	/*
	 * VP_CONFIG: error gain is not set here, it will be updated
	 * on each scale, based on OPP.
	 */
	val = (voltdm->pmic->vp_erroroffset <<
	       __ffs(voltdm->vp->common->vpconfig_erroroffset_mask)) |
		vp->common->vpconfig_timeouten;
	voltdm->write(val, vp->vpconfig);

	/* VSTEPMIN */
	val = (waittime << vp->common->vstepmin_smpswaittimemin_shift) |
		(vstepmin <<  vp->common->vstepmin_stepmin_shift);
	voltdm->write(val, vp->vstepmin);

	/* VSTEPMAX */
	val = (vstepmax << vp->common->vstepmax_stepmax_shift) |
		(waittime << vp->common->vstepmax_smpswaittimemax_shift);
	voltdm->write(val, vp->vstepmax);

	/* VLIMITTO */
	val = (vddmax << vp->common->vlimitto_vddmax_shift) |
		(vddmin << vp->common->vlimitto_vddmin_shift) |
		(timeout <<  vp->common->vlimitto_timeout_shift);
	voltdm->write(val, vp->vlimitto);
}

int omap_vp_update_errorgain(struct voltagedomain *voltdm,
			     unsigned long target_volt)
{
	struct omap_volt_data *volt_data;

	if (!voltdm->vp)
		return -EINVAL;

	/* Get volt_data corresponding to target_volt */
	volt_data = omap_voltage_get_voltdata(voltdm, target_volt);
	if (IS_ERR(volt_data))
		return -EINVAL;

	/* Setting vp errorgain based on the voltage */
	voltdm->rmw(voltdm->vp->common->vpconfig_errorgain_mask,
		    volt_data->vp_errgain <<
		    __ffs(voltdm->vp->common->vpconfig_errorgain_mask),
		    voltdm->vp->vpconfig);

	return 0;
}

/* VP force update method of voltage scaling */
int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
			      unsigned long target_volt)
{
	struct omap_vp_instance *vp = voltdm->vp;
	u32 vpconfig;
	u8 target_vsel, current_vsel;
	int ret, timeout = 0;

	ret = omap_vc_pre_scale(voltdm, target_volt, &target_vsel, &current_vsel);
	if (ret)
		return ret;

	/*
	 * Clear all pending TransactionDone interrupt/status. Typical latency
	 * is <3us
	 */
	while (timeout++ < VP_TRANXDONE_TIMEOUT) {
		vp->common->ops->clear_txdone(vp->id);
		if (!vp->common->ops->check_txdone(vp->id))
			break;
		udelay(1);
	}
	if (timeout >= VP_TRANXDONE_TIMEOUT) {
		pr_warning("%s: vdd_%s TRANXDONE timeout exceeded."
			"Voltage change aborted", __func__, voltdm->name);
		return -ETIMEDOUT;
	}

	vpconfig = _vp_set_init_voltage(voltdm, target_volt);

	/* Force update of voltage */
	voltdm->write(vpconfig | vp->common->vpconfig_forceupdate,
		      voltdm->vp->vpconfig);

	/*
	 * Wait for TransactionDone. Typical latency is <200us.
	 * Depends on SMPSWAITTIMEMIN/MAX and voltage change
	 */
	timeout = 0;
	omap_test_timeout(vp->common->ops->check_txdone(vp->id),
			  VP_TRANXDONE_TIMEOUT, timeout);
	if (timeout >= VP_TRANXDONE_TIMEOUT)
		pr_err("%s: vdd_%s TRANXDONE timeout exceeded."
			"TRANXDONE never got set after the voltage update\n",
			__func__, voltdm->name);

	omap_vc_post_scale(voltdm, target_volt, target_vsel, current_vsel);

	/*
	 * Disable TransactionDone interrupt , clear all status, clear
	 * control registers
	 */
	timeout = 0;
	while (timeout++ < VP_TRANXDONE_TIMEOUT) {
		vp->common->ops->clear_txdone(vp->id);
		if (!vp->common->ops->check_txdone(vp->id))
			break;
		udelay(1);
	}

	if (timeout >= VP_TRANXDONE_TIMEOUT)
		pr_warning("%s: vdd_%s TRANXDONE timeout exceeded while trying"
			"to clear the TRANXDONE status\n",
			__func__, voltdm->name);

	/* Clear force bit */
	voltdm->write(vpconfig, vp->vpconfig);

	return 0;
}

/**
 * omap_vp_enable() - API to enable a particular VP
 * @voltdm:	pointer to the VDD whose VP is to be enabled.
 *
 * This API enables a particular voltage processor. Needed by the smartreflex
 * class drivers.
 */
void omap_vp_enable(struct voltagedomain *voltdm)
{
	struct omap_vp_instance *vp;
	u32 vpconfig, volt;

	if (!voltdm || IS_ERR(voltdm)) {
		pr_warning("%s: VDD specified does not exist!\n", __func__);
		return;
	}

	vp = voltdm->vp;
	if (!voltdm->read || !voltdm->write) {
		pr_err("%s: No read/write API for accessing vdd_%s regs\n",
			__func__, voltdm->name);
		return;
	}

	/* If VP is already enabled, do nothing. Return */
	if (vp->enabled)
		return;

	volt = voltdm_get_voltage(voltdm);
	if (!volt) {
		pr_warning("%s: unable to find current voltage for %s\n",
			   __func__, voltdm->name);
		return;
	}

	vpconfig = _vp_set_init_voltage(voltdm, volt);

	/* Enable VP */
	vpconfig |= vp->common->vpconfig_vpenable;
	voltdm->write(vpconfig, vp->vpconfig);

	vp->enabled = true;
}

/**
 * omap_vp_disable() - API to disable a particular VP
 * @voltdm:	pointer to the VDD whose VP is to be disabled.
 *
 * This API disables a particular voltage processor. Needed by the smartreflex
 * class drivers.
 */
void omap_vp_disable(struct voltagedomain *voltdm)
{
	struct omap_vp_instance *vp;
	u32 vpconfig;
	int timeout;

	if (!voltdm || IS_ERR(voltdm)) {
		pr_warning("%s: VDD specified does not exist!\n", __func__);
		return;
	}

	vp = voltdm->vp;
	if (!voltdm->read || !voltdm->write) {
		pr_err("%s: No read/write API for accessing vdd_%s regs\n",
			__func__, voltdm->name);
		return;
	}

	/* If VP is already disabled, do nothing. Return */
	if (!vp->enabled) {
		pr_warning("%s: Trying to disable VP for vdd_%s when"
			"it is already disabled\n", __func__, voltdm->name);
		return;
	}

	/* Disable VP */
	vpconfig = voltdm->read(vp->vpconfig);
	vpconfig &= ~vp->common->vpconfig_vpenable;
	voltdm->write(vpconfig, vp->vpconfig);

	/*
	 * Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
	 */
	omap_test_timeout((voltdm->read(vp->vstatus)),
			  VP_IDLE_TIMEOUT, timeout);

	if (timeout >= VP_IDLE_TIMEOUT)
		pr_warning("%s: vdd_%s idle timedout\n",
			__func__, voltdm->name);

	vp->enabled = false;

	return;
}
Commit	Line	Data
01f48d30 KH	1	#include <linux/kernel.h>
01f48d30 KH	2	#include <linux/init.h>
01f48d30	3
4e65331c	4	#include "common.h"
01f48d30 KH	5
	6	#include "voltage.h"
	7	#include "vp.h"
	8	#include "prm-regbits-34xx.h"
	9	#include "prm-regbits-44xx.h"
	10	#include "prm44xx.h"
	11
b666b476	12	static u32 _vp_set_init_voltage(struct voltagedomain *voltdm, u32 volt)
01f48d30	13	{
b7ea803e	14	struct omap_vp_instance *vp = voltdm->vp;
01f48d30	15	u32 vpconfig;
01f48d30	16	char vsel;
01f48d30	17
b666b476	18	vsel = voltdm->pmic->uv_to_vsel(volt);
01f48d30	19
4bcc475e	20	vpconfig = voltdm->read(vp->vpconfig);
b7ea803e	21	vpconfig &= ~(vp->common->vpconfig_initvoltage_mask \|
b666b476 KH	22	vp->common->vpconfig_forceupdate \|
b666b476 KH	23	vp->common->vpconfig_initvdd);
0ec3041e	24	vpconfig \|= vsel << __ffs(vp->common->vpconfig_initvoltage_mask);
4bcc475e	25	voltdm->write(vpconfig, vp->vpconfig);
01f48d30 KH	26
01f48d30 KH	27	/* Trigger initVDD value copy to voltage processor */
b7ea803e	28	voltdm->write((vpconfig \| vp->common->vpconfig_initvdd),
4bcc475e	29	vp->vpconfig);
01f48d30 KH	30
01f48d30 KH	31	/* Clear initVDD copy trigger bit */
4bcc475e	32	voltdm->write(vpconfig, vp->vpconfig);
b666b476 KH	33
b666b476 KH	34	return vpconfig;
01f48d30 KH	35	}
	36
	37	/* Generic voltage init functions */
	38	void __init omap_vp_init(struct voltagedomain *voltdm)
	39	{
b7ea803e	40	struct omap_vp_instance *vp = voltdm->vp;
667216d6 KH	41	u32 val, sys_clk_rate, timeout, waittime;
667216d6 KH	42	u32 vddmin, vddmax, vstepmin, vstepmax;
01f48d30	43
4bcc475e	44	if (!voltdm->read \|\| !voltdm->write) {
01f48d30 KH	45	pr_err("%s: No read/write API for accessing vdd_%s regs\n",
	46	__func__, voltdm->name);
	47	return;
	48	}
	49
6f567273 KH	50	vp->enabled = false;
	51
	52	/* Divide to avoid overflow */
	53	sys_clk_rate = voltdm->sys_clk.rate / 1000;
	54
667216d6 KH	55	timeout = (sys_clk_rate * voltdm->pmic->vp_timeout_us) / 1000;
	56	vddmin = voltdm->pmic->vp_vddmin;
	57	vddmax = voltdm->pmic->vp_vddmax;
6f567273 KH	58
	59	waittime = ((voltdm->pmic->step_size / voltdm->pmic->slew_rate) *
	60	sys_clk_rate) / 1000;
667216d6 KH	61	vstepmin = voltdm->pmic->vp_vstepmin;
	62	vstepmax = voltdm->pmic->vp_vstepmax;
	63
	64	/*
	65	* VP_CONFIG: error gain is not set here, it will be updated
	66	* on each scale, based on OPP.
	67	*/
	68	val = (voltdm->pmic->vp_erroroffset <<
	69	__ffs(voltdm->vp->common->vpconfig_erroroffset_mask)) \|
b7ea803e	70	vp->common->vpconfig_timeouten;
667216d6 KH	71	voltdm->write(val, vp->vpconfig);
	72
	73	/* VSTEPMIN */
	74	val = (waittime << vp->common->vstepmin_smpswaittimemin_shift) \|
	75	(vstepmin << vp->common->vstepmin_stepmin_shift);
	76	voltdm->write(val, vp->vstepmin);
	77
	78	/* VSTEPMAX */
	79	val = (vstepmax << vp->common->vstepmax_stepmax_shift) \|
	80	(waittime << vp->common->vstepmax_smpswaittimemax_shift);
	81	voltdm->write(val, vp->vstepmax);
	82
	83	/* VLIMITTO */
	84	val = (vddmax << vp->common->vlimitto_vddmax_shift) \|
	85	(vddmin << vp->common->vlimitto_vddmin_shift) \|
	86	(timeout << vp->common->vlimitto_timeout_shift);
	87	voltdm->write(val, vp->vlimitto);
01f48d30 KH	88	}
01f48d30 KH	89
76ea7424 KH	90	int omap_vp_update_errorgain(struct voltagedomain *voltdm,
	91	unsigned long target_volt)
	92	{
	93	struct omap_volt_data *volt_data;
	94
8798c4ab KH	95	if (!voltdm->vp)
	96	return -EINVAL;
	97
76ea7424 KH	98	/* Get volt_data corresponding to target_volt */
	99	volt_data = omap_voltage_get_voltdata(voltdm, target_volt);
	100	if (IS_ERR(volt_data))
	101	return -EINVAL;
	102
	103	/* Setting vp errorgain based on the voltage */
	104	voltdm->rmw(voltdm->vp->common->vpconfig_errorgain_mask,
	105	volt_data->vp_errgain <<
	106	__ffs(voltdm->vp->common->vpconfig_errorgain_mask),
	107	voltdm->vp->vpconfig);
	108
	109	return 0;
	110	}
	111
01f48d30 KH	112	/* VP force update method of voltage scaling */
	113	int omap_vp_forceupdate_scale(struct voltagedomain *voltdm,
	114	unsigned long target_volt)
	115	{
b7ea803e	116	struct omap_vp_instance *vp = voltdm->vp;
01f48d30 KH	117	u32 vpconfig;
	118	u8 target_vsel, current_vsel;
	119	int ret, timeout = 0;
	120
	121	ret = omap_vc_pre_scale(voltdm, target_volt, &target_vsel, &current_vsel);
	122	if (ret)
	123	return ret;
	124
	125	/*
	126	* Clear all pending TransactionDone interrupt/status. Typical latency
	127	* is <3us
	128	*/
	129	while (timeout++ < VP_TRANXDONE_TIMEOUT) {
b7ea803e KH	130	vp->common->ops->clear_txdone(vp->id);
b7ea803e KH	131	if (!vp->common->ops->check_txdone(vp->id))
01f48d30 KH	132	break;
	133	udelay(1);
	134	}
	135	if (timeout >= VP_TRANXDONE_TIMEOUT) {
	136	pr_warning("%s: vdd_%s TRANXDONE timeout exceeded."
	137	"Voltage change aborted", __func__, voltdm->name);
	138	return -ETIMEDOUT;
	139	}
	140
b666b476	141	vpconfig = _vp_set_init_voltage(voltdm, target_volt);
01f48d30 KH	142
01f48d30 KH	143	/* Force update of voltage */
b666b476 KH	144	voltdm->write(vpconfig \| vp->common->vpconfig_forceupdate,
b666b476 KH	145	voltdm->vp->vpconfig);
01f48d30 KH	146
	147	/*
	148	* Wait for TransactionDone. Typical latency is <200us.
	149	* Depends on SMPSWAITTIMEMIN/MAX and voltage change
	150	*/
	151	timeout = 0;
b7ea803e	152	omap_test_timeout(vp->common->ops->check_txdone(vp->id),
01f48d30 KH	153	VP_TRANXDONE_TIMEOUT, timeout);
	154	if (timeout >= VP_TRANXDONE_TIMEOUT)
	155	pr_err("%s: vdd_%s TRANXDONE timeout exceeded."
	156	"TRANXDONE never got set after the voltage update\n",
	157	__func__, voltdm->name);
	158
	159	omap_vc_post_scale(voltdm, target_volt, target_vsel, current_vsel);
	160
	161	/*
	162	* Disable TransactionDone interrupt , clear all status, clear
	163	* control registers
	164	*/
	165	timeout = 0;
	166	while (timeout++ < VP_TRANXDONE_TIMEOUT) {
b7ea803e KH	167	vp->common->ops->clear_txdone(vp->id);
b7ea803e KH	168	if (!vp->common->ops->check_txdone(vp->id))
01f48d30 KH	169	break;
	170	udelay(1);
	171	}
	172
	173	if (timeout >= VP_TRANXDONE_TIMEOUT)
	174	pr_warning("%s: vdd_%s TRANXDONE timeout exceeded while trying"
	175	"to clear the TRANXDONE status\n",
	176	__func__, voltdm->name);
	177
01f48d30	178	/* Clear force bit */
4bcc475e	179	voltdm->write(vpconfig, vp->vpconfig);
01f48d30 KH	180
	181	return 0;
	182	}
	183
01f48d30 KH	184	/**
	185	* omap_vp_enable() - API to enable a particular VP
	186	* @voltdm: pointer to the VDD whose VP is to be enabled.
	187	*
	188	* This API enables a particular voltage processor. Needed by the smartreflex
	189	* class drivers.
	190	*/
	191	void omap_vp_enable(struct voltagedomain *voltdm)
	192	{
b7ea803e	193	struct omap_vp_instance *vp;
b666b476	194	u32 vpconfig, volt;
01f48d30 KH	195
	196	if (!voltdm \|\| IS_ERR(voltdm)) {
	197	pr_warning("%s: VDD specified does not exist!\n", __func__);
	198	return;
	199	}
	200
b7ea803e	201	vp = voltdm->vp;
4bcc475e	202	if (!voltdm->read \|\| !voltdm->write) {
01f48d30 KH	203	pr_err("%s: No read/write API for accessing vdd_%s regs\n",
	204	__func__, voltdm->name);
	205	return;
	206	}
	207
	208	/* If VP is already enabled, do nothing. Return */
b7ea803e	209	if (vp->enabled)
01f48d30 KH	210	return;
01f48d30 KH	211
b666b476 KH	212	volt = voltdm_get_voltage(voltdm);
	213	if (!volt) {
	214	pr_warning("%s: unable to find current voltage for %s\n",
	215	__func__, voltdm->name);
	216	return;
	217	}
	218
	219	vpconfig = _vp_set_init_voltage(voltdm, volt);
01f48d30 KH	220
01f48d30 KH	221	/* Enable VP */
b7ea803e	222	vpconfig \|= vp->common->vpconfig_vpenable;
4bcc475e	223	voltdm->write(vpconfig, vp->vpconfig);
b666b476	224
b7ea803e	225	vp->enabled = true;
01f48d30 KH	226	}
	227
	228	/**
	229	* omap_vp_disable() - API to disable a particular VP
	230	* @voltdm: pointer to the VDD whose VP is to be disabled.
	231	*
	232	* This API disables a particular voltage processor. Needed by the smartreflex
	233	* class drivers.
	234	*/
	235	void omap_vp_disable(struct voltagedomain *voltdm)
	236	{
b7ea803e	237	struct omap_vp_instance *vp;
01f48d30 KH	238	u32 vpconfig;
	239	int timeout;
	240
	241	if (!voltdm \|\| IS_ERR(voltdm)) {
	242	pr_warning("%s: VDD specified does not exist!\n", __func__);
	243	return;
	244	}
	245
b7ea803e	246	vp = voltdm->vp;
4bcc475e	247	if (!voltdm->read \|\| !voltdm->write) {
01f48d30 KH	248	pr_err("%s: No read/write API for accessing vdd_%s regs\n",
	249	__func__, voltdm->name);
	250	return;
	251	}
	252
	253	/* If VP is already disabled, do nothing. Return */
b7ea803e	254	if (!vp->enabled) {
01f48d30 KH	255	pr_warning("%s: Trying to disable VP for vdd_%s when"
	256	"it is already disabled\n", __func__, voltdm->name);
	257	return;
	258	}
	259
	260	/* Disable VP */
4bcc475e	261	vpconfig = voltdm->read(vp->vpconfig);
b7ea803e	262	vpconfig &= ~vp->common->vpconfig_vpenable;
4bcc475e	263	voltdm->write(vpconfig, vp->vpconfig);
01f48d30 KH	264
	265	/*
	266	* Wait for VP idle Typical latency is <2us. Maximum latency is ~100us
	267	*/
4bcc475e KH	268	omap_test_timeout((voltdm->read(vp->vstatus)),
4bcc475e KH	269	VP_IDLE_TIMEOUT, timeout);
01f48d30 KH	270
	271	if (timeout >= VP_IDLE_TIMEOUT)
	272	pr_warning("%s: vdd_%s idle timedout\n",
	273	__func__, voltdm->name);
	274
b7ea803e	275	vp->enabled = false;
01f48d30 KH	276
	277	return;
	278	}