diff options
Diffstat (limited to 'arch/arm/mach-davinci/psc.c')
| -rw-r--r-- | arch/arm/mach-davinci/psc.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/arch/arm/mach-davinci/psc.c b/arch/arm/mach-davinci/psc.c new file mode 100644 index 00000000000..e1b0050283a --- /dev/null +++ b/arch/arm/mach-davinci/psc.c @@ -0,0 +1,113 @@ +/* + * 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/module.h> +#include <linux/init.h> + +#include <asm/io.h> +#include <asm/hardware.h> +#include <asm/arch/psc.h> + +#define PTCMD __REG(0x01C41120) +#define PDSTAT __REG(0x01C41200) +#define PDCTL1 __REG(0x01C41304) +#define EPCPR __REG(0x01C41070) +#define PTSTAT __REG(0x01C41128) + +#define MDSTAT IO_ADDRESS(0x01C41800) +#define MDCTL IO_ADDRESS(0x01C41A00) + +#define PINMUX0 __REG(0x01c40000) +#define PINMUX1 __REG(0x01c40004) +#define VDD3P3V_PWDN __REG(0x01C40048) + +static void davinci_psc_mux(unsigned int id) +{ + switch (id) { + case DAVINCI_LPSC_ATA: + PINMUX0 |= (1 << 17) | (1 << 16); + break; + case DAVINCI_LPSC_MMC_SD: + /* VDD power manupulations are done in U-Boot for CPMAC + * so applies to MMC as well + */ + /*Set up the pull regiter for MMC */ + VDD3P3V_PWDN = 0x0; + PINMUX1 &= (~(1 << 9)); + break; + case DAVINCI_LPSC_I2C: + PINMUX1 |= (1 << 7); + break; + case DAVINCI_LPSC_McBSP: + PINMUX1 |= (1 << 10); + break; + default: + break; + } +} + +/* Enable or disable a PSC domain */ +void davinci_psc_config(unsigned int domain, unsigned int id, char enable) +{ + volatile unsigned int *mdstat = (unsigned int *)((int)MDSTAT + 4 * id); + volatile unsigned int *mdctl = (unsigned int *)((int)MDCTL + 4 * id); + + if (id < 0) + return; + + if (enable) + *mdctl |= 0x00000003; /* Enable Module */ + else + *mdctl &= 0xFFFFFFF2; /* Disable Module */ + + if ((PDSTAT & 0x00000001) == 0) { + PDCTL1 |= 0x1; + PTCMD = (1 << domain); + while ((((EPCPR >> domain) & 1) == 0)); + + PDCTL1 |= 0x100; + while (!(((PTSTAT >> domain) & 1) == 0)); + } else { + PTCMD = (1 << domain); + while (!(((PTSTAT >> domain) & 1) == 0)); + } + + if (enable) + while (!((*mdstat & 0x0000001F) == 0x3)); + else + while (!((*mdstat & 0x0000001F) == 0x2)); + + if (enable) + davinci_psc_mux(id); +} + +void __init davinci_psc_init(void) +{ + davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSMSTR, 1); + davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_VPSSSLV, 1); + davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPCC, 1); + davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC0, 1); + davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TPTC1, 1); + davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_GPIO, 1); + + /* Turn on WatchDog timer LPSC. Needed for RESET to work */ + davinci_psc_config(DAVINCI_GPSC_ARMDOMAIN, DAVINCI_LPSC_TIMER2, 1); +} |