118 lines
3.2 KiB
C
118 lines
3.2 KiB
C
/*
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* TI DaVinci Power and Sleep Controller (PSC)
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*
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* Copyright (C) 2006 Texas Instruments.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <mach/cputype.h>
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#include <mach/hardware.h>
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#include <mach/psc.h>
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#include <mach/mux.h>
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/* PSC register offsets */
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#define EPCPR 0x070
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#define PTCMD 0x120
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#define PTSTAT 0x128
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#define PDSTAT 0x200
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#define PDCTL1 0x304
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#define MDSTAT 0x800
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#define MDCTL 0xA00
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#define MDSTAT_STATE_MASK 0x1f
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/* Return nonzero iff the domain's clock is active */
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int __init davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id)
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{
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void __iomem *psc_base;
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u32 mdstat;
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struct davinci_soc_info *soc_info = &davinci_soc_info;
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if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
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pr_warning("PSC: Bad psc data: 0x%x[%d]\n",
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(int)soc_info->psc_bases, ctlr);
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return 0;
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}
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psc_base = soc_info->psc_bases[ctlr];
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mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
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/* if clocked, state can be "Enable" or "SyncReset" */
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return mdstat & BIT(12);
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}
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/* Enable or disable a PSC domain */
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void davinci_psc_config(unsigned int domain, unsigned int ctlr,
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unsigned int id, char enable)
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{
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u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl;
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void __iomem *psc_base;
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struct davinci_soc_info *soc_info = &davinci_soc_info;
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u32 next_state = enable ? 0x3 : 0x2; /* 0x3 enables, 0x2 disables */
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if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
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pr_warning("PSC: Bad psc data: 0x%x[%d]\n",
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(int)soc_info->psc_bases, ctlr);
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return;
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}
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psc_base = soc_info->psc_bases[ctlr];
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mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
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mdctl &= ~MDSTAT_STATE_MASK;
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mdctl |= next_state;
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__raw_writel(mdctl, psc_base + MDCTL + 4 * id);
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pdstat = __raw_readl(psc_base + PDSTAT);
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if ((pdstat & 0x00000001) == 0) {
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pdctl1 = __raw_readl(psc_base + PDCTL1);
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pdctl1 |= 0x1;
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__raw_writel(pdctl1, psc_base + PDCTL1);
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ptcmd = 1 << domain;
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__raw_writel(ptcmd, psc_base + PTCMD);
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do {
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epcpr = __raw_readl(psc_base + EPCPR);
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} while ((((epcpr >> domain) & 1) == 0));
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pdctl1 = __raw_readl(psc_base + PDCTL1);
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pdctl1 |= 0x100;
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__raw_writel(pdctl1, psc_base + PDCTL1);
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do {
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ptstat = __raw_readl(psc_base +
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PTSTAT);
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} while (!(((ptstat >> domain) & 1) == 0));
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} else {
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ptcmd = 1 << domain;
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__raw_writel(ptcmd, psc_base + PTCMD);
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do {
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ptstat = __raw_readl(psc_base + PTSTAT);
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} while (!(((ptstat >> domain) & 1) == 0));
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}
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do {
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mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
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} while (!((mdstat & MDSTAT_STATE_MASK) == next_state));
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}
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