/** @file pcie_core.c
 *
 * Contains PCIe related functions that are shared between different driver models (e.g. firmware
 * builds, DHD builds, BMAC builds), in order to avoid code duplication.
 *
 * $Copyright Open Broadcom Corporation$
 *
 * $Id: pcie_core.c 444841 2013-12-21 04:32:29Z $
 */

#include <bcm_cfg.h>
#include <typedefs.h>
#include <bcmutils.h>
#include <bcmdefs.h>
#include <osl.h>
#include <siutils.h>
#include <hndsoc.h>
#include <sbchipc.h>

#include "pcie_core.h"

/* local prototypes */

/* local variables */

/* function definitions */

#ifdef BCMDRIVER

void pcie_watchdog_reset(osl_t *osh, si_t *sih, sbpcieregs_t *sbpcieregs)
{
	uint32 val, i, lsc;
	uint16 cfg_offset[] = {PCIECFGREG_STATUS_CMD, PCIECFGREG_PM_CSR,
		PCIECFGREG_MSI_CAP, PCIECFGREG_MSI_ADDR_L,
		PCIECFGREG_MSI_ADDR_H, PCIECFGREG_MSI_DATA,
		PCIECFGREG_LINK_STATUS_CTRL2, PCIECFGREG_RBAR_CTRL,
		PCIECFGREG_PML1_SUB_CTRL1, PCIECFGREG_REG_BAR2_CONFIG,
		PCIECFGREG_REG_BAR3_CONFIG};
	sbpcieregs_t *pcie = NULL;
	uint32 origidx = si_coreidx(sih);

	/* Switch to PCIE2 core */
	pcie = (sbpcieregs_t *)si_setcore(sih, PCIE2_CORE_ID, 0);
	BCM_REFERENCE(pcie);
	ASSERT(pcie != NULL);

	/* Disable/restore ASPM Control to protect the watchdog reset */
	W_REG(osh, &sbpcieregs->configaddr, PCIECFGREG_LINK_STATUS_CTRL);
	lsc = R_REG(osh, &sbpcieregs->configdata);
	val = lsc & (~PCIE_ASPM_ENAB);
	W_REG(osh, &sbpcieregs->configdata, val);

	si_corereg(sih, SI_CC_IDX, OFFSETOF(chipcregs_t, watchdog), ~0, 4);
	OSL_DELAY(100000);

	W_REG(osh, &sbpcieregs->configaddr, PCIECFGREG_LINK_STATUS_CTRL);
	W_REG(osh, &sbpcieregs->configdata, lsc);

	/* Write configuration registers back to the shadow registers
	 * cause shadow registers are cleared out after watchdog reset.
	 */
	for (i = 0; i < ARRAYSIZE(cfg_offset); i++) {
		W_REG(osh, &sbpcieregs->configaddr, cfg_offset[i]);
		val = R_REG(osh, &sbpcieregs->configdata);
		W_REG(osh, &sbpcieregs->configdata, val);
	}
	si_setcoreidx(sih, origidx);
}

#endif /* BCMDRIVER */