1a07bfb521
A common do-while loop can be factored out from the end of the branches. Signed-off-by: Nicolas Kaiser <nikai@nikai.net> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
100 lines
2.9 KiB
C
100 lines
2.9 KiB
C
/*
|
|
* TI DaVinci Power and Sleep Controller (PSC)
|
|
*
|
|
* Copyright (C) 2006 Texas Instruments.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
*/
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
|
|
#include <mach/cputype.h>
|
|
#include <mach/psc.h>
|
|
|
|
/* Return nonzero iff the domain's clock is active */
|
|
int __init davinci_psc_is_clk_active(unsigned int ctlr, unsigned int id)
|
|
{
|
|
void __iomem *psc_base;
|
|
u32 mdstat;
|
|
struct davinci_soc_info *soc_info = &davinci_soc_info;
|
|
|
|
if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
|
|
pr_warning("PSC: Bad psc data: 0x%x[%d]\n",
|
|
(int)soc_info->psc_bases, ctlr);
|
|
return 0;
|
|
}
|
|
|
|
psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
|
|
mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
|
|
iounmap(psc_base);
|
|
|
|
/* if clocked, state can be "Enable" or "SyncReset" */
|
|
return mdstat & BIT(12);
|
|
}
|
|
|
|
/* Enable or disable a PSC domain */
|
|
void davinci_psc_config(unsigned int domain, unsigned int ctlr,
|
|
unsigned int id, u32 next_state)
|
|
{
|
|
u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl;
|
|
void __iomem *psc_base;
|
|
struct davinci_soc_info *soc_info = &davinci_soc_info;
|
|
|
|
if (!soc_info->psc_bases || (ctlr >= soc_info->psc_bases_num)) {
|
|
pr_warning("PSC: Bad psc data: 0x%x[%d]\n",
|
|
(int)soc_info->psc_bases, ctlr);
|
|
return;
|
|
}
|
|
|
|
psc_base = ioremap(soc_info->psc_bases[ctlr], SZ_4K);
|
|
|
|
mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
|
|
mdctl &= ~MDSTAT_STATE_MASK;
|
|
mdctl |= next_state;
|
|
__raw_writel(mdctl, psc_base + MDCTL + 4 * id);
|
|
|
|
pdstat = __raw_readl(psc_base + PDSTAT);
|
|
if ((pdstat & 0x00000001) == 0) {
|
|
pdctl1 = __raw_readl(psc_base + PDCTL1);
|
|
pdctl1 |= 0x1;
|
|
__raw_writel(pdctl1, psc_base + PDCTL1);
|
|
|
|
ptcmd = 1 << domain;
|
|
__raw_writel(ptcmd, psc_base + PTCMD);
|
|
|
|
do {
|
|
epcpr = __raw_readl(psc_base + EPCPR);
|
|
} while ((((epcpr >> domain) & 1) == 0));
|
|
|
|
pdctl1 = __raw_readl(psc_base + PDCTL1);
|
|
pdctl1 |= 0x100;
|
|
__raw_writel(pdctl1, psc_base + PDCTL1);
|
|
} else {
|
|
ptcmd = 1 << domain;
|
|
__raw_writel(ptcmd, psc_base + PTCMD);
|
|
}
|
|
|
|
do {
|
|
ptstat = __raw_readl(psc_base + PTSTAT);
|
|
} while (!(((ptstat >> domain) & 1) == 0));
|
|
|
|
do {
|
|
mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
|
|
} while (!((mdstat & MDSTAT_STATE_MASK) == next_state));
|
|
|
|
iounmap(psc_base);
|
|
}
|