2 * TI DaVinci Power and Sleep Controller (PSC)
4 * Copyright (C) 2006 Texas Instruments.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
26 #include <mach/cputype.h>
27 #include <mach/hardware.h>
31 #define DAVINCI_PWR_SLEEP_CNTRL_BASE 0x01C41000
33 /* PSC register offsets */
42 #define MDSTAT_STATE_MASK 0x1f
44 /* Return nonzero iff the domain's clock is active */
45 int __init davinci_psc_is_clk_active(unsigned int id)
47 void __iomem *psc_base = IO_ADDRESS(DAVINCI_PWR_SLEEP_CNTRL_BASE);
48 u32 mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
50 /* if clocked, state can be "Enable" or "SyncReset" */
51 return mdstat & BIT(12);
54 /* Enable or disable a PSC domain */
55 void davinci_psc_config(unsigned int domain, unsigned int id, char enable)
57 u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl;
58 void __iomem *psc_base = IO_ADDRESS(DAVINCI_PWR_SLEEP_CNTRL_BASE);
59 u32 next_state = enable ? 0x3 : 0x2; /* 0x3 enables, 0x2 disables */
61 mdctl = __raw_readl(psc_base + MDCTL + 4 * id);
62 mdctl &= ~MDSTAT_STATE_MASK;
64 __raw_writel(mdctl, psc_base + MDCTL + 4 * id);
66 pdstat = __raw_readl(psc_base + PDSTAT);
67 if ((pdstat & 0x00000001) == 0) {
68 pdctl1 = __raw_readl(psc_base + PDCTL1);
70 __raw_writel(pdctl1, psc_base + PDCTL1);
73 __raw_writel(ptcmd, psc_base + PTCMD);
76 epcpr = __raw_readl(psc_base + EPCPR);
77 } while ((((epcpr >> domain) & 1) == 0));
79 pdctl1 = __raw_readl(psc_base + PDCTL1);
81 __raw_writel(pdctl1, psc_base + PDCTL1);
84 ptstat = __raw_readl(psc_base +
86 } while (!(((ptstat >> domain) & 1) == 0));
89 __raw_writel(ptcmd, psc_base + PTCMD);
92 ptstat = __raw_readl(psc_base + PTSTAT);
93 } while (!(((ptstat >> domain) & 1) == 0));
97 mdstat = __raw_readl(psc_base + MDSTAT + 4 * id);
98 } while (!((mdstat & MDSTAT_STATE_MASK) == next_state));