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/hardware.h>
30 /* PSC register offsets */
39 /* System control register offsets */
40 #define VDD3P3V_PWDN 0x48
42 static void davinci_psc_mux(unsigned int id)
45 case DAVINCI_LPSC_ATA:
46 davinci_mux_peripheral(DAVINCI_MUX_HDIREN, 1);
47 davinci_mux_peripheral(DAVINCI_MUX_ATAEN, 1);
49 case DAVINCI_LPSC_MMC_SD:
50 /* VDD power manupulations are done in U-Boot for CPMAC
51 * so applies to MMC as well
53 /*Set up the pull regiter for MMC */
54 davinci_writel(0, DAVINCI_SYSTEM_MODULE_BASE + VDD3P3V_PWDN);
55 davinci_mux_peripheral(DAVINCI_MUX_MSTK, 0);
57 case DAVINCI_LPSC_I2C:
58 davinci_mux_peripheral(DAVINCI_MUX_I2C, 1);
60 case DAVINCI_LPSC_McBSP:
61 davinci_mux_peripheral(DAVINCI_MUX_ASP, 1);
68 /* Enable or disable a PSC domain */
69 void davinci_psc_config(unsigned int domain, unsigned int id, char enable)
71 u32 epcpr, ptcmd, ptstat, pdstat, pdctl1, mdstat, mdctl, mdstat_mask;
73 mdctl = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
75 mdctl |= 0x00000003; /* Enable Module */
77 mdctl &= 0xFFFFFFF2; /* Disable Module */
78 davinci_writel(mdctl, DAVINCI_PWR_SLEEP_CNTRL_BASE + MDCTL + 4 * id);
80 pdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDSTAT);
81 if ((pdstat & 0x00000001) == 0) {
82 pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
84 davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
87 davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
90 epcpr = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
92 } while ((((epcpr >> domain) & 1) == 0));
94 pdctl1 = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
96 davinci_writel(pdctl1, DAVINCI_PWR_SLEEP_CNTRL_BASE + PDCTL1);
99 ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
101 } while (!(((ptstat >> domain) & 1) == 0));
104 davinci_writel(ptcmd, DAVINCI_PWR_SLEEP_CNTRL_BASE + PTCMD);
107 ptstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
109 } while (!(((ptstat >> domain) & 1) == 0));
118 mdstat = davinci_readl(DAVINCI_PWR_SLEEP_CNTRL_BASE +
120 } while (!((mdstat & 0x0000001F) == mdstat_mask));
126 void __init davinci_psc_init(void)
128 davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSMSTR, 1);
129 davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSSLV, 1);
130 davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPCC, 1);
131 davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC0, 1);
132 davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC1, 1);
133 davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_GPIO, 1);
135 /* Turn on WatchDog timer LPSC. Needed for RESET to work */
136 davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TIMER2, 1);