linux-next/arch/arm/mach-imx/anatop.c

/*
 * Copyright (C) 2013 Freescale Semiconductor, Inc.
 *
 * The code contained herein is licensed under the GNU General Public
 * License. You may obtain a copy of the GNU General Public License
 * Version 2 or later at the following locations:
 *
 * http://www.opensource.org/licenses/gpl-license.html
 * http://www.gnu.org/copyleft/gpl.html
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include "common.h"
#include "hardware.h"

#define REG_SET		0x4
#define REG_CLR		0x8

#define ANADIG_REG_2P5		0x130
#define ANADIG_REG_CORE		0x140
#define ANADIG_ANA_MISC0	0x150
#define ANADIG_USB1_CHRG_DETECT	0x1b0
#define ANADIG_USB2_CHRG_DETECT	0x210
#define ANADIG_DIGPROG		0x260
#define ANADIG_DIGPROG_IMX6SL	0x280

#define BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG	0x40000
#define BM_ANADIG_REG_2P5_ENABLE_PULLDOWN	0x8
#define BM_ANADIG_REG_CORE_FET_ODRIVE		0x20000000
#define BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG	0x1000
/* Below MISC0_DISCON_HIGH_SNVS is only for i.MX6SL */
#define BM_ANADIG_ANA_MISC0_DISCON_HIGH_SNVS	0x2000
#define BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B	0x80000
#define BM_ANADIG_USB_CHRG_DETECT_EN_B		0x100000

static struct regmap *anatop;

static void imx_anatop_enable_weak2p5(bool enable)
{
	u32 reg, val;

	regmap_read(anatop, ANADIG_ANA_MISC0, &val);

	/* can only be enabled when stop_mode_config is clear. */
	reg = ANADIG_REG_2P5;
	reg += (enable && (val & BM_ANADIG_ANA_MISC0_STOP_MODE_CONFIG) == 0) ?
		REG_SET : REG_CLR;
	regmap_write(anatop, reg, BM_ANADIG_REG_2P5_ENABLE_WEAK_LINREG);
}

static void imx_anatop_enable_fet_odrive(bool enable)
{
	regmap_write(anatop, ANADIG_REG_CORE + (enable ? REG_SET : REG_CLR),
		BM_ANADIG_REG_CORE_FET_ODRIVE);
}

static inline void imx_anatop_enable_2p5_pulldown(bool enable)
{
	regmap_write(anatop, ANADIG_REG_2P5 + (enable ? REG_SET : REG_CLR),
		BM_ANADIG_REG_2P5_ENABLE_PULLDOWN);
}

static inline void imx_anatop_disconnect_high_snvs(bool enable)
{
	regmap_write(anatop, ANADIG_ANA_MISC0 + (enable ? REG_SET : REG_CLR),
		BM_ANADIG_ANA_MISC0_DISCON_HIGH_SNVS);
}

void imx_anatop_pre_suspend(void)
{
	if (imx_mmdc_get_ddr_type() == IMX_DDR_TYPE_LPDDR2)
		imx_anatop_enable_2p5_pulldown(true);
	else
		imx_anatop_enable_weak2p5(true);

	imx_anatop_enable_fet_odrive(true);

	if (cpu_is_imx6sl())
		imx_anatop_disconnect_high_snvs(true);
}

void imx_anatop_post_resume(void)
{
	if (imx_mmdc_get_ddr_type() == IMX_DDR_TYPE_LPDDR2)
		imx_anatop_enable_2p5_pulldown(false);
	else
		imx_anatop_enable_weak2p5(false);

	imx_anatop_enable_fet_odrive(false);

	if (cpu_is_imx6sl())
		imx_anatop_disconnect_high_snvs(false);

}

static void imx_anatop_usb_chrg_detect_disable(void)
{
	regmap_write(anatop, ANADIG_USB1_CHRG_DETECT,
		BM_ANADIG_USB_CHRG_DETECT_EN_B
		| BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
	regmap_write(anatop, ANADIG_USB2_CHRG_DETECT,
		BM_ANADIG_USB_CHRG_DETECT_EN_B |
		BM_ANADIG_USB_CHRG_DETECT_CHK_CHRG_B);
}

void __init imx_init_revision_from_anatop(void)
{
	struct device_node *np;
	void __iomem *anatop_base;
	unsigned int revision;
	u32 digprog;
	u16 offset = ANADIG_DIGPROG;

	np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-anatop");
	anatop_base = of_iomap(np, 0);
	WARN_ON(!anatop_base);
	if (of_device_is_compatible(np, "fsl,imx6sl-anatop"))
		offset = ANADIG_DIGPROG_IMX6SL;
	digprog = readl_relaxed(anatop_base + offset);
	iounmap(anatop_base);

	switch (digprog & 0xff) {
	case 0:
		revision = IMX_CHIP_REVISION_1_0;
		break;
	case 1:
		revision = IMX_CHIP_REVISION_1_1;
		break;
	case 2:
		revision = IMX_CHIP_REVISION_1_2;
		break;
	case 3:
		revision = IMX_CHIP_REVISION_1_3;
		break;
	case 4:
		revision = IMX_CHIP_REVISION_1_4;
		break;
	case 5:
		/*
		 * i.MX6DQ TO1.5 is defined as Rev 1.3 in Data Sheet, marked
		 * as 'D' in Part Number last character.
		 */
		revision = IMX_CHIP_REVISION_1_5;
		break;
	default:
		revision = IMX_CHIP_REVISION_UNKNOWN;
	}

	mxc_set_cpu_type(digprog >> 16 & 0xff);
	imx_set_soc_revision(revision);
}

void __init imx_anatop_init(void)
{
	anatop = syscon_regmap_lookup_by_compatible("fsl,imx6q-anatop");
	if (IS_ERR(anatop)) {
		pr_err("%s: failed to find imx6q-anatop regmap!\n", __func__);
		return;
	}

	imx_anatop_usb_chrg_detect_disable();
}