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/*
* Power and Sleep Controller (PSC) functions.
*
* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
* Copyright (C) 2008 Lyrtech <www.lyrtech.com>
* Copyright (C) 2004 Texas Instruments.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/hardware.h>
#include <asm/io.h>
/*
* The PSC manages three inputs to a "module" which may be a peripheral or
* CPU. Those inputs are the module's: clock; reset signal; and sometimes
* its power domain. For our purposes, we only care whether clock and power
* are active, and the module is out of reset.
*
* DaVinci chips may include two separate power domains: "Always On" and "DSP".
* Chips without a DSP generally have only one domain.
*
* The "Always On" power domain is always on when the chip is on, and is
* powered by the VDD pins (on DM644X). The majority of DaVinci modules
* lie within the "Always On" power domain.
*
* A separate domain called the "DSP" domain houses the C64x+ and other video
* hardware such as VICP. In some chips, the "DSP" domain is not always on.
* The "DSP" power domain is powered by the CVDDDSP pins (on DM644X).
*/
/* Works on Always On power domain only (no PD argument) */
static void lpsc_transition(unsigned int id, unsigned int state)
{
dv_reg_p mdstat, mdctl, ptstat, ptcmd;
#ifdef CONFIG_SOC_DA8XX
struct davinci_psc_regs *psc_regs;
#endif
#ifndef CONFIG_SOC_DA8XX
if (id >= DAVINCI_LPSC_GEM)
return; /* Don't work on DSP Power Domain */
mdstat = REG_P(PSC_MDSTAT_BASE + (id * 4));
mdctl = REG_P(PSC_MDCTL_BASE + (id * 4));
ptstat = REG_P(PSC_PTSTAT);
ptcmd = REG_P(PSC_PTCMD);
#else
if (id < DAVINCI_LPSC_PSC1_BASE) {
if (id >= PSC_PSC0_MODULE_ID_CNT)
return;
psc_regs = davinci_psc0_regs;
mdstat = &psc_regs->psc0.mdstat[id];
mdctl = &psc_regs->psc0.mdctl[id];
} else {
id -= DAVINCI_LPSC_PSC1_BASE;
if (id >= PSC_PSC1_MODULE_ID_CNT)
return;
psc_regs = davinci_psc1_regs;
mdstat = &psc_regs->psc1.mdstat[id];
mdctl = &psc_regs->psc1.mdctl[id];
}
ptstat = &psc_regs->ptstat;
ptcmd = &psc_regs->ptcmd;
#endif
while (readl(ptstat) & 0x01)
continue;
if ((readl(mdstat) & PSC_MDSTAT_STATE) == state)
return; /* Already in that state */
writel((readl(mdctl) & ~PSC_MDCTL_NEXT) | state, mdctl);
switch (id) {
#ifdef CONFIG_SOC_DM644X
/* Special treatment for some modules as for sprue14 p.7.4.2 */
case DAVINCI_LPSC_VPSSSLV:
case DAVINCI_LPSC_EMAC:
case DAVINCI_LPSC_EMAC_WRAPPER:
case DAVINCI_LPSC_MDIO:
case DAVINCI_LPSC_USB:
case DAVINCI_LPSC_ATA:
case DAVINCI_LPSC_VLYNQ:
case DAVINCI_LPSC_UHPI:
case DAVINCI_LPSC_DDR_EMIF:
case DAVINCI_LPSC_AEMIF:
case DAVINCI_LPSC_MMC_SD:
case DAVINCI_LPSC_MEMSTICK:
case DAVINCI_LPSC_McBSP:
case DAVINCI_LPSC_GPIO:
writel(readl(mdctl) | 0x200, mdctl);
break;
#endif
}
writel(0x01, ptcmd);
while (readl(ptstat) & 0x01)
continue;
while ((readl(mdstat) & PSC_MDSTAT_STATE) != state)
continue;
}
void lpsc_on(unsigned int id)
{
lpsc_transition(id, 0x03);
}
void lpsc_syncreset(unsigned int id)
{
lpsc_transition(id, 0x01);
}
void lpsc_disable(unsigned int id)
{
lpsc_transition(id, 0x0);
}
/* Not all DaVinci chips have a DSP power domain. */
#ifdef CONFIG_SOC_DM644X
/* If DSPLINK is used, we don't want U-Boot to power on the DSP. */
#if !defined(CONFIG_SYS_USE_DSPLINK)
void dsp_on(void)
{
int i;
if (REG(PSC_PDSTAT1) & 0x1f)
return; /* Already on */
REG(PSC_GBLCTL) |= 0x01;
REG(PSC_PDCTL1) |= 0x01;
REG(PSC_PDCTL1) &= ~0x100;
REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_GEM * 4)) |= 0x03;
REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_GEM * 4)) &= 0xfffffeff;
REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_IMCOP * 4)) |= 0x03;
REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_IMCOP * 4)) &= 0xfffffeff;
REG(PSC_PTCMD) = 0x02;
for (i = 0; i < 100; i++) {
if (REG(PSC_EPCPR) & 0x02)
break;
}
REG(PSC_CHP_SHRTSW) = 0x01;
REG(PSC_PDCTL1) |= 0x100;
REG(PSC_EPCCR) = 0x02;
for (i = 0; i < 100; i++) {
if (!(REG(PSC_PTSTAT) & 0x02))
break;
}
REG(PSC_GBLCTL) &= ~0x1f;
}
#endif /* CONFIG_SYS_USE_DSPLINK */
#endif /* have a DSP */
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