/*
 * Broadcom specific AMBA
 * ChipCommon Power Management Unit driver
 *
 * Copyright 2009, Michael Buesch <m@bues.ch>
 * Copyright 2007, Broadcom Corporation
 *
 * Licensed under the GNU/GPL. See COPYING for details.
 */

#include "bcma_private.h"
#include <linux/bcma/bcma.h>

static u32 bcma_chipco_pll_read(struct bcma_drv_cc *cc, u32 offset)
{
	bcma_cc_write32(cc, BCMA_CC_PLLCTL_ADDR, offset);
	bcma_cc_read32(cc, BCMA_CC_PLLCTL_ADDR);
	return bcma_cc_read32(cc, BCMA_CC_PLLCTL_DATA);
}

static void bcma_chipco_chipctl_maskset(struct bcma_drv_cc *cc,
					u32 offset, u32 mask, u32 set)
{
	u32 value;

	bcma_cc_read32(cc, BCMA_CC_CHIPCTL_ADDR);
	bcma_cc_write32(cc, BCMA_CC_CHIPCTL_ADDR, offset);
	bcma_cc_read32(cc, BCMA_CC_CHIPCTL_ADDR);
	value = bcma_cc_read32(cc, BCMA_CC_CHIPCTL_DATA);
	value &= mask;
	value |= set;
	bcma_cc_write32(cc, BCMA_CC_CHIPCTL_DATA, value);
	bcma_cc_read32(cc, BCMA_CC_CHIPCTL_DATA);
}

static void bcma_pmu_pll_init(struct bcma_drv_cc *cc)
{
	struct bcma_bus *bus = cc->core->bus;

	switch (bus->chipinfo.id) {
	case 0x4313:
	case 0x4331:
	case 43224:
	case 43225:
		break;
	default:
		pr_err("PLL init unknown for device 0x%04X\n",
			bus->chipinfo.id);
	}
}

static void bcma_pmu_resources_init(struct bcma_drv_cc *cc)
{
	struct bcma_bus *bus = cc->core->bus;
	u32 min_msk = 0, max_msk = 0;

	switch (bus->chipinfo.id) {
	case 0x4313:
		min_msk = 0x200D;
		max_msk = 0xFFFF;
		break;
	case 43224:
	case 43225:
		break;
	default:
		pr_err("PMU resource config unknown for device 0x%04X\n",
			bus->chipinfo.id);
	}

	/* Set the resource masks. */
	if (min_msk)
		bcma_cc_write32(cc, BCMA_CC_PMU_MINRES_MSK, min_msk);
	if (max_msk)
		bcma_cc_write32(cc, BCMA_CC_PMU_MAXRES_MSK, max_msk);
}

void bcma_pmu_swreg_init(struct bcma_drv_cc *cc)
{
	struct bcma_bus *bus = cc->core->bus;

	switch (bus->chipinfo.id) {
	case 0x4313:
	case 0x4331:
	case 43224:
	case 43225:
		break;
	default:
		pr_err("PMU switch/regulators init unknown for device "
			"0x%04X\n", bus->chipinfo.id);
	}
}

void bcma_pmu_workarounds(struct bcma_drv_cc *cc)
{
	struct bcma_bus *bus = cc->core->bus;

	switch (bus->chipinfo.id) {
	case 0x4313:
		bcma_chipco_chipctl_maskset(cc, 0, ~0, 0x7);
		break;
	case 0x4331:
		pr_err("Enabling Ext PA lines not implemented\n");
		break;
	case 43224:
		if (bus->chipinfo.rev == 0) {
			pr_err("Workarounds for 43224 rev 0 not fully "
				"implemented\n");
			bcma_chipco_chipctl_maskset(cc, 0, ~0, 0x00F000F0);
		} else {
			bcma_chipco_chipctl_maskset(cc, 0, ~0, 0xF0);
		}
		break;
	case 43225:
		break;
	default:
		pr_err("Workarounds unknown for device 0x%04X\n",
			bus->chipinfo.id);
	}
}

void bcma_pmu_init(struct bcma_drv_cc *cc)
{
	u32 pmucap;

	pmucap = bcma_cc_read32(cc, BCMA_CC_PMU_CAP);
	cc->pmu.rev = (pmucap & BCMA_CC_PMU_CAP_REVISION);

	pr_debug("Found rev %u PMU (capabilities 0x%08X)\n", cc->pmu.rev,
		 pmucap);

	if (cc->pmu.rev == 1)
		bcma_cc_mask32(cc, BCMA_CC_PMU_CTL,
			      ~BCMA_CC_PMU_CTL_NOILPONW);
	else
		bcma_cc_set32(cc, BCMA_CC_PMU_CTL,
			     BCMA_CC_PMU_CTL_NOILPONW);

	if (cc->core->id.id == 0x4329 && cc->core->id.rev == 2)
		pr_err("Fix for 4329b0 bad LPOM state not implemented!\n");

	bcma_pmu_pll_init(cc);
	bcma_pmu_resources_init(cc);
	bcma_pmu_swreg_init(cc);
	bcma_pmu_workarounds(cc);
}

u32 bcma_pmu_alp_clock(struct bcma_drv_cc *cc)
{
	struct bcma_bus *bus = cc->core->bus;

	switch (bus->chipinfo.id) {
	case 0x4716:
	case 0x4748:
	case 47162:
	case 0x4313:
	case 0x5357:
	case 0x4749:
	case 53572:
		/* always 20Mhz */
		return 20000 * 1000;
	case 0x5356:
	case 0x5300:
		/* always 25Mhz */
		return 25000 * 1000;
	default:
		pr_warn("No ALP clock specified for %04X device, "
			"pmu rev. %d, using default %d Hz\n",
			bus->chipinfo.id, cc->pmu.rev, BCMA_CC_PMU_ALP_CLOCK);
	}
	return BCMA_CC_PMU_ALP_CLOCK;
}

/* Find the output of the "m" pll divider given pll controls that start with
 * pllreg "pll0" i.e. 12 for main 6 for phy, 0 for misc.
 */
static u32 bcma_pmu_clock(struct bcma_drv_cc *cc, u32 pll0, u32 m)
{
	u32 tmp, div, ndiv, p1, p2, fc;
	struct bcma_bus *bus = cc->core->bus;

	BUG_ON((pll0 & 3) || (pll0 > BCMA_CC_PMU4716_MAINPLL_PLL0));

	BUG_ON(!m || m > 4);

	if (bus->chipinfo.id == 0x5357 || bus->chipinfo.id == 0x4749) {
		/* Detect failure in clock setting */
		tmp = bcma_cc_read32(cc, BCMA_CC_CHIPSTAT);
		if (tmp & 0x40000)
			return 133 * 1000000;
	}

	tmp = bcma_chipco_pll_read(cc, pll0 + BCMA_CC_PPL_P1P2_OFF);
	p1 = (tmp & BCMA_CC_PPL_P1_MASK) >> BCMA_CC_PPL_P1_SHIFT;
	p2 = (tmp & BCMA_CC_PPL_P2_MASK) >> BCMA_CC_PPL_P2_SHIFT;

	tmp = bcma_chipco_pll_read(cc, pll0 + BCMA_CC_PPL_M14_OFF);
	div = (tmp >> ((m - 1) * BCMA_CC_PPL_MDIV_WIDTH)) &
		BCMA_CC_PPL_MDIV_MASK;

	tmp = bcma_chipco_pll_read(cc, pll0 + BCMA_CC_PPL_NM5_OFF);
	ndiv = (tmp & BCMA_CC_PPL_NDIV_MASK) >> BCMA_CC_PPL_NDIV_SHIFT;

	/* Do calculation in Mhz */
	fc = bcma_pmu_alp_clock(cc) / 1000000;
	fc = (p1 * ndiv * fc) / p2;

	/* Return clock in Hertz */
	return (fc / div) * 1000000;
}

/* query bus clock frequency for PMU-enabled chipcommon */
u32 bcma_pmu_get_clockcontrol(struct bcma_drv_cc *cc)
{
	struct bcma_bus *bus = cc->core->bus;

	switch (bus->chipinfo.id) {
	case 0x4716:
	case 0x4748:
	case 47162:
		return bcma_pmu_clock(cc, BCMA_CC_PMU4716_MAINPLL_PLL0,
				      BCMA_CC_PMU5_MAINPLL_SSB);
	case 0x5356:
		return bcma_pmu_clock(cc, BCMA_CC_PMU5356_MAINPLL_PLL0,
				      BCMA_CC_PMU5_MAINPLL_SSB);
	case 0x5357:
	case 0x4749:
		return bcma_pmu_clock(cc, BCMA_CC_PMU5357_MAINPLL_PLL0,
				      BCMA_CC_PMU5_MAINPLL_SSB);
	case 0x5300:
		return bcma_pmu_clock(cc, BCMA_CC_PMU4706_MAINPLL_PLL0,
				      BCMA_CC_PMU5_MAINPLL_SSB);
	case 53572:
		return 75000000;
	default:
		pr_warn("No backplane clock specified for %04X device, "
			"pmu rev. %d, using default %d Hz\n",
			bus->chipinfo.id, cc->pmu.rev, BCMA_CC_PMU_HT_CLOCK);
	}
	return BCMA_CC_PMU_HT_CLOCK;
}

/* query cpu clock frequency for PMU-enabled chipcommon */
u32 bcma_pmu_get_clockcpu(struct bcma_drv_cc *cc)
{
	struct bcma_bus *bus = cc->core->bus;

	if (bus->chipinfo.id == 53572)
		return 300000000;

	if (cc->pmu.rev >= 5) {
		u32 pll;
		switch (bus->chipinfo.id) {
		case 0x5356:
			pll = BCMA_CC_PMU5356_MAINPLL_PLL0;
			break;
		case 0x5357:
		case 0x4749:
			pll = BCMA_CC_PMU5357_MAINPLL_PLL0;
			break;
		default:
			pll = BCMA_CC_PMU4716_MAINPLL_PLL0;
			break;
		}

		/* TODO: if (bus->chipinfo.id == 0x5300)
		  return si_4706_pmu_clock(sih, osh, cc, PMU4706_MAINPLL_PLL0, PMU5_MAINPLL_CPU); */
		return bcma_pmu_clock(cc, pll, BCMA_CC_PMU5_MAINPLL_CPU);
	}

	return bcma_pmu_get_clockcontrol(cc);
}