[mirror_ubuntu-artful-kernel.git] / arch / arm / mach-omap2 / prm44xx.c

/*
 * OMAP4 PRM module functions
 *
 * Copyright (C) 2011 Texas Instruments, Inc.
 * Copyright (C) 2010 Nokia Corporation
 * Benoît Cousson
 * Paul Walmsley
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/io.h>

#include "common.h"
#include <plat/cpu.h>
#include <plat/irqs.h>
#include <plat/prcm.h>

#include "vp.h"
#include "prm44xx.h"
#include "prm-regbits-44xx.h"
#include "prcm44xx.h"
#include "prminst44xx.h"

static const struct omap_prcm_irq omap4_prcm_irqs[] = {
	OMAP_PRCM_IRQ("wkup",   0,      0),
	OMAP_PRCM_IRQ("io",     9,      1),
};

static struct omap_prcm_irq_setup omap4_prcm_irq_setup = {
	.ack			= OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
	.mask			= OMAP4_PRM_IRQENABLE_MPU_OFFSET,
	.nr_regs		= 2,
	.irqs			= omap4_prcm_irqs,
	.nr_irqs		= ARRAY_SIZE(omap4_prcm_irqs),
	.irq			= OMAP44XX_IRQ_PRCM,
	.read_pending_irqs	= &omap44xx_prm_read_pending_irqs,
	.ocp_barrier		= &omap44xx_prm_ocp_barrier,
	.save_and_clear_irqen	= &omap44xx_prm_save_and_clear_irqen,
	.restore_irqen		= &omap44xx_prm_restore_irqen,
};

/* PRM low-level functions */

/* Read a register in a CM/PRM instance in the PRM module */
u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
{
	return __raw_readl(OMAP44XX_PRM_REGADDR(inst, reg));
}

/* Write into a register in a CM/PRM instance in the PRM module */
void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
{
	__raw_writel(val, OMAP44XX_PRM_REGADDR(inst, reg));
}

/* Read-modify-write a register in a PRM module. Caller must lock */
u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
{
	u32 v;

	v = omap4_prm_read_inst_reg(inst, reg);
	v &= ~mask;
	v |= bits;
	omap4_prm_write_inst_reg(v, inst, reg);

	return v;
}

/* PRM VP */

/*
 * struct omap4_vp - OMAP4 VP register access description.
 * @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
 * @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
 */
struct omap4_vp {
	u32 irqstatus_mpu;
	u32 tranxdone_status;
};

static struct omap4_vp omap4_vp[] = {
	[OMAP4_VP_VDD_MPU_ID] = {
		.irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
		.tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK,
	},
	[OMAP4_VP_VDD_IVA_ID] = {
		.irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
		.tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK,
	},
	[OMAP4_VP_VDD_CORE_ID] = {
		.irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
		.tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK,
	},
};

u32 omap4_prm_vp_check_txdone(u8 vp_id)
{
	struct omap4_vp *vp = &omap4_vp[vp_id];
	u32 irqstatus;

	irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
						OMAP4430_PRM_OCP_SOCKET_INST,
						vp->irqstatus_mpu);
	return irqstatus & vp->tranxdone_status;
}

void omap4_prm_vp_clear_txdone(u8 vp_id)
{
	struct omap4_vp *vp = &omap4_vp[vp_id];

	omap4_prminst_write_inst_reg(vp->tranxdone_status,
				     OMAP4430_PRM_PARTITION,
				     OMAP4430_PRM_OCP_SOCKET_INST,
				     vp->irqstatus_mpu);
};

u32 omap4_prm_vcvp_read(u8 offset)
{
	return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
					   OMAP4430_PRM_DEVICE_INST, offset);
}

void omap4_prm_vcvp_write(u32 val, u8 offset)
{
	omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION,
				     OMAP4430_PRM_DEVICE_INST, offset);
}

u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
{
	return omap4_prminst_rmw_inst_reg_bits(mask, bits,
					       OMAP4430_PRM_PARTITION,
					       OMAP4430_PRM_DEVICE_INST,
					       offset);
}

static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs)
{
	u32 mask, st;

	/* XXX read mask from RAM? */
	mask = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, irqen_offs);
	st = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, irqst_offs);

	return mask & st;
}

/**
 * omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
 * @events: ptr to two consecutive u32s, preallocated by caller
 *
 * Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM
 * MPU IRQs, and store the result into the two u32s pointed to by @events.
 * No return value.
 */
void omap44xx_prm_read_pending_irqs(unsigned long *events)
{
	events[0] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_OFFSET,
					  OMAP4_PRM_IRQSTATUS_MPU_OFFSET);

	events[1] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_2_OFFSET,
					  OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
}

/**
 * omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
 *
 * Force any buffered writes to the PRM IP block to complete.  Needed
 * by the PRM IRQ handler, which reads and writes directly to the IP
 * block, to avoid race conditions after acknowledging or clearing IRQ
 * bits.  No return value.
 */
void omap44xx_prm_ocp_barrier(void)
{
	omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
				OMAP4_REVISION_PRM_OFFSET);
}

/**
 * omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs
 * @saved_mask: ptr to a u32 array to save IRQENABLE bits
 *
 * Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to
 * @saved_mask.  @saved_mask must be allocated by the caller.
 * Intended to be used in the PRM interrupt handler suspend callback.
 * The OCP barrier is needed to ensure the write to disable PRM
 * interrupts reaches the PRM before returning; otherwise, spurious
 * interrupts might occur.  No return value.
 */
void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask)
{
	saved_mask[0] =
		omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
					OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
	saved_mask[1] =
		omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
					OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);

	omap4_prm_write_inst_reg(0, OMAP4430_PRM_DEVICE_INST,
				 OMAP4_PRM_IRQENABLE_MPU_OFFSET);
	omap4_prm_write_inst_reg(0, OMAP4430_PRM_DEVICE_INST,
				 OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);

	/* OCP barrier */
	omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
				OMAP4_REVISION_PRM_OFFSET);
}

/**
 * omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args
 * @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
 *
 * Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from
 * @saved_mask.  Intended to be used in the PRM interrupt handler resume
 * callback to restore values saved by omap44xx_prm_save_and_clear_irqen().
 * No OCP barrier should be needed here; any pending PRM interrupts will fire
 * once the writes reach the PRM.  No return value.
 */
void omap44xx_prm_restore_irqen(u32 *saved_mask)
{
	omap4_prm_write_inst_reg(saved_mask[0], OMAP4430_PRM_DEVICE_INST,
				 OMAP4_PRM_IRQENABLE_MPU_OFFSET);
	omap4_prm_write_inst_reg(saved_mask[1], OMAP4430_PRM_DEVICE_INST,
				 OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
}

static int __init omap4xxx_prcm_init(void)
{
	if (cpu_is_omap44xx())
		return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
	return 0;
}
subsys_initcall(omap4xxx_prcm_init);
Commit	Line	Data
0be1621a BC	1	/*
	2	* OMAP4 PRM module functions
	3	*
eaac329d	4	* Copyright (C) 2011 Texas Instruments, Inc.
0be1621a BC	5	* Copyright (C) 2010 Nokia Corporation
	6	* Benoît Cousson
	7	* Paul Walmsley
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/kernel.h>
	15	#include <linux/delay.h>
	16	#include <linux/errno.h>
	17	#include <linux/err.h>
2ace831f	18	#include <linux/io.h>
0be1621a	19
4e65331c	20	#include "common.h"
0be1621a	21	#include <plat/cpu.h>
e6fa35aa	22	#include <plat/irqs.h>
0be1621a BC	23	#include <plat/prcm.h>
0be1621a BC	24
58aaa599	25	#include "vp.h"
d198b514	26	#include "prm44xx.h"
0be1621a	27	#include "prm-regbits-44xx.h"
4bb73ade KH	28	#include "prcm44xx.h"
4bb73ade KH	29	#include "prminst44xx.h"
0be1621a	30
2f31b516 TK	31	static const struct omap_prcm_irq omap4_prcm_irqs[] = {
	32	OMAP_PRCM_IRQ("wkup", 0, 0),
	33	OMAP_PRCM_IRQ("io", 9, 1),
	34	};
	35
	36	static struct omap_prcm_irq_setup omap4_prcm_irq_setup = {
	37	.ack = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
	38	.mask = OMAP4_PRM_IRQENABLE_MPU_OFFSET,
	39	.nr_regs = 2,
	40	.irqs = omap4_prcm_irqs,
	41	.nr_irqs = ARRAY_SIZE(omap4_prcm_irqs),
	42	.irq = OMAP44XX_IRQ_PRCM,
	43	.read_pending_irqs = &omap44xx_prm_read_pending_irqs,
	44	.ocp_barrier = &omap44xx_prm_ocp_barrier,
	45	.save_and_clear_irqen = &omap44xx_prm_save_and_clear_irqen,
	46	.restore_irqen = &omap44xx_prm_restore_irqen,
	47	};
	48
2ace831f PW	49	/* PRM low-level functions */
	50
	51	/* Read a register in a CM/PRM instance in the PRM module */
	52	u32 omap4_prm_read_inst_reg(s16 inst, u16 reg)
	53	{
	54	return __raw_readl(OMAP44XX_PRM_REGADDR(inst, reg));
	55	}
	56
	57	/* Write into a register in a CM/PRM instance in the PRM module */
	58	void omap4_prm_write_inst_reg(u32 val, s16 inst, u16 reg)
	59	{
	60	__raw_writel(val, OMAP44XX_PRM_REGADDR(inst, reg));
	61	}
	62
	63	/* Read-modify-write a register in a PRM module. Caller must lock */
	64	u32 omap4_prm_rmw_inst_reg_bits(u32 mask, u32 bits, s16 inst, s16 reg)
	65	{
	66	u32 v;
	67
	68	v = omap4_prm_read_inst_reg(inst, reg);
	69	v &= ~mask;
	70	v \|= bits;
	71	omap4_prm_write_inst_reg(v, inst, reg);
	72
	73	return v;
	74	}
58aaa599 KH	75
	76	/* PRM VP */
	77
	78	/*
	79	* struct omap4_vp - OMAP4 VP register access description.
	80	* @irqstatus_mpu: offset to IRQSTATUS_MPU register for VP
	81	* @tranxdone_status: VP_TRANXDONE_ST bitmask in PRM_IRQSTATUS_MPU reg
	82	*/
	83	struct omap4_vp {
	84	u32 irqstatus_mpu;
	85	u32 tranxdone_status;
	86	};
	87
	88	static struct omap4_vp omap4_vp[] = {
	89	[OMAP4_VP_VDD_MPU_ID] = {
	90	.irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET,
	91	.tranxdone_status = OMAP4430_VP_MPU_TRANXDONE_ST_MASK,
	92	},
	93	[OMAP4_VP_VDD_IVA_ID] = {
	94	.irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
	95	.tranxdone_status = OMAP4430_VP_IVA_TRANXDONE_ST_MASK,
	96	},
	97	[OMAP4_VP_VDD_CORE_ID] = {
	98	.irqstatus_mpu = OMAP4_PRM_IRQSTATUS_MPU_OFFSET,
	99	.tranxdone_status = OMAP4430_VP_CORE_TRANXDONE_ST_MASK,
	100	},
	101	};
	102
	103	u32 omap4_prm_vp_check_txdone(u8 vp_id)
	104	{
	105	struct omap4_vp *vp = &omap4_vp[vp_id];
	106	u32 irqstatus;
	107
	108	irqstatus = omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
	109	OMAP4430_PRM_OCP_SOCKET_INST,
	110	vp->irqstatus_mpu);
	111	return irqstatus & vp->tranxdone_status;
	112	}
	113
	114	void omap4_prm_vp_clear_txdone(u8 vp_id)
	115	{
	116	struct omap4_vp *vp = &omap4_vp[vp_id];
	117
	118	omap4_prminst_write_inst_reg(vp->tranxdone_status,
	119	OMAP4430_PRM_PARTITION,
	120	OMAP4430_PRM_OCP_SOCKET_INST,
	121	vp->irqstatus_mpu);
	122	};
4bb73ade KH	123
	124	u32 omap4_prm_vcvp_read(u8 offset)
	125	{
	126	return omap4_prminst_read_inst_reg(OMAP4430_PRM_PARTITION,
	127	OMAP4430_PRM_DEVICE_INST, offset);
	128	}
	129
	130	void omap4_prm_vcvp_write(u32 val, u8 offset)
	131	{
	132	omap4_prminst_write_inst_reg(val, OMAP4430_PRM_PARTITION,
	133	OMAP4430_PRM_DEVICE_INST, offset);
	134	}
	135
	136	u32 omap4_prm_vcvp_rmw(u32 mask, u32 bits, u8 offset)
	137	{
	138	return omap4_prminst_rmw_inst_reg_bits(mask, bits,
	139	OMAP4430_PRM_PARTITION,
	140	OMAP4430_PRM_DEVICE_INST,
	141	offset);
	142	}
26c98c56 PW	143
	144	static inline u32 _read_pending_irq_reg(u16 irqen_offs, u16 irqst_offs)
	145	{
	146	u32 mask, st;
	147
	148	/* XXX read mask from RAM? */
	149	mask = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, irqen_offs);
	150	st = omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST, irqst_offs);
	151
	152	return mask & st;
	153	}
	154
	155	/**
	156	* omap44xx_prm_read_pending_irqs - read pending PRM MPU IRQs into @events
	157	* @events: ptr to two consecutive u32s, preallocated by caller
	158	*
	159	* Read PRM_IRQSTATUS_MPU* bits, AND'ed with the currently-enabled PRM
	160	* MPU IRQs, and store the result into the two u32s pointed to by @events.
	161	* No return value.
	162	*/
	163	void omap44xx_prm_read_pending_irqs(unsigned long *events)
	164	{
	165	events[0] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_OFFSET,
	166	OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
	167
	168	events[1] = _read_pending_irq_reg(OMAP4_PRM_IRQENABLE_MPU_2_OFFSET,
	169	OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
	170	}
	171
	172	/**
	173	* omap44xx_prm_ocp_barrier - force buffered MPU writes to the PRM to complete
	174	*
	175	* Force any buffered writes to the PRM IP block to complete. Needed
	176	* by the PRM IRQ handler, which reads and writes directly to the IP
	177	* block, to avoid race conditions after acknowledging or clearing IRQ
	178	* bits. No return value.
	179	*/
	180	void omap44xx_prm_ocp_barrier(void)
	181	{
	182	omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
	183	OMAP4_REVISION_PRM_OFFSET);
	184	}
91285b6f TK	185
	186	/**
	187	* omap44xx_prm_save_and_clear_irqen - save/clear PRM_IRQENABLE_MPU* regs
	188	* @saved_mask: ptr to a u32 array to save IRQENABLE bits
	189	*
	190	* Save the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers to
	191	* @saved_mask. @saved_mask must be allocated by the caller.
	192	* Intended to be used in the PRM interrupt handler suspend callback.
	193	* The OCP barrier is needed to ensure the write to disable PRM
	194	* interrupts reaches the PRM before returning; otherwise, spurious
	195	* interrupts might occur. No return value.
	196	*/
	197	void omap44xx_prm_save_and_clear_irqen(u32 *saved_mask)
	198	{
	199	saved_mask[0] =
	200	omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
	201	OMAP4_PRM_IRQSTATUS_MPU_OFFSET);
	202	saved_mask[1] =
	203	omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
	204	OMAP4_PRM_IRQSTATUS_MPU_2_OFFSET);
	205
	206	omap4_prm_write_inst_reg(0, OMAP4430_PRM_DEVICE_INST,
	207	OMAP4_PRM_IRQENABLE_MPU_OFFSET);
	208	omap4_prm_write_inst_reg(0, OMAP4430_PRM_DEVICE_INST,
	209	OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
	210
	211	/* OCP barrier */
	212	omap4_prm_read_inst_reg(OMAP4430_PRM_DEVICE_INST,
	213	OMAP4_REVISION_PRM_OFFSET);
	214	}
	215
	216	/**
	217	* omap44xx_prm_restore_irqen - set PRM_IRQENABLE_MPU* registers from args
	218	* @saved_mask: ptr to a u32 array of IRQENABLE bits saved previously
	219	*
	220	* Restore the PRM_IRQENABLE_MPU and PRM_IRQENABLE_MPU_2 registers from
	221	* @saved_mask. Intended to be used in the PRM interrupt handler resume
	222	* callback to restore values saved by omap44xx_prm_save_and_clear_irqen().
	223	* No OCP barrier should be needed here; any pending PRM interrupts will fire
	224	* once the writes reach the PRM. No return value.
	225	*/
	226	void omap44xx_prm_restore_irqen(u32 *saved_mask)
	227	{
	228	omap4_prm_write_inst_reg(saved_mask[0], OMAP4430_PRM_DEVICE_INST,
	229	OMAP4_PRM_IRQENABLE_MPU_OFFSET);
	230	omap4_prm_write_inst_reg(saved_mask[1], OMAP4430_PRM_DEVICE_INST,
	231	OMAP4_PRM_IRQENABLE_MPU_2_OFFSET);
	232	}
2f31b516 TK	233
	234	static int __init omap4xxx_prcm_init(void)
	235	{
	236	if (cpu_is_omap44xx())
	237	return omap_prcm_register_chain_handler(&omap4_prcm_irq_setup);
	238	return 0;
	239	}
	240	subsys_initcall(omap4xxx_prcm_init);