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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
84 lines
2.3 KiB
C
84 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Power and Sleep Controller (PSC) functions.
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*
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* Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net>
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* Copyright (C) 2008 Lyrtech <www.lyrtech.com>
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* Copyright (C) 2004 Texas Instruments.
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*/
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#include <common.h>
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#include <asm/arch/hardware.h>
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#include <asm/io.h>
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/*
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* The PSC manages three inputs to a "module" which may be a peripheral or
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* CPU. Those inputs are the module's: clock; reset signal; and sometimes
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* its power domain. For our purposes, we only care whether clock and power
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* are active, and the module is out of reset.
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*
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* DaVinci chips may include two separate power domains: "Always On" and "DSP".
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* Chips without a DSP generally have only one domain.
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*
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* The "Always On" power domain is always on when the chip is on, and is
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* powered by the VDD pins (on DM644X). The majority of DaVinci modules
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* lie within the "Always On" power domain.
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*
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* A separate domain called the "DSP" domain houses the C64x+ and other video
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* hardware such as VICP. In some chips, the "DSP" domain is not always on.
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* The "DSP" power domain is powered by the CVDDDSP pins (on DM644X).
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*/
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/* Works on Always On power domain only (no PD argument) */
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static void lpsc_transition(unsigned int id, unsigned int state)
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{
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dv_reg_p mdstat, mdctl, ptstat, ptcmd;
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struct davinci_psc_regs *psc_regs;
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if (id < DAVINCI_LPSC_PSC1_BASE) {
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if (id >= PSC_PSC0_MODULE_ID_CNT)
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return;
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psc_regs = davinci_psc0_regs;
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mdstat = &psc_regs->psc0.mdstat[id];
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mdctl = &psc_regs->psc0.mdctl[id];
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} else {
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id -= DAVINCI_LPSC_PSC1_BASE;
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if (id >= PSC_PSC1_MODULE_ID_CNT)
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return;
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psc_regs = davinci_psc1_regs;
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mdstat = &psc_regs->psc1.mdstat[id];
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mdctl = &psc_regs->psc1.mdctl[id];
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}
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ptstat = &psc_regs->ptstat;
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ptcmd = &psc_regs->ptcmd;
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while (readl(ptstat) & 0x01)
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continue;
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if ((readl(mdstat) & PSC_MDSTAT_STATE) == state)
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return; /* Already in that state */
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writel((readl(mdctl) & ~PSC_MDCTL_NEXT) | state, mdctl);
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writel(0x01, ptcmd);
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while (readl(ptstat) & 0x01)
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continue;
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while ((readl(mdstat) & PSC_MDSTAT_STATE) != state)
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continue;
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}
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void lpsc_on(unsigned int id)
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{
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lpsc_transition(id, 0x03);
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}
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void lpsc_syncreset(unsigned int id)
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{
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lpsc_transition(id, 0x01);
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}
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void lpsc_disable(unsigned int id)
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{
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lpsc_transition(id, 0x0);
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}
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