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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * 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.
- */
- #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;
- struct davinci_psc_regs *psc_regs;
- 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;
- 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);
- 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);
- }
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