1/* 2 * Power and Sleep Controller (PSC) functions. 3 * 4 * Copyright (C) 2007 Sergey Kubushyn <ksi@koi8.net> 5 * Copyright (C) 2008 Lyrtech <www.lyrtech.com> 6 * Copyright (C) 2004 Texas Instruments. 7 * 8 * See file CREDITS for list of people who contributed to this 9 * project. 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 24 */ 25 26#include <common.h> 27#include <asm/arch/hardware.h> 28 29#define PINMUX0_EMACEN (1 << 31) 30#define PINMUX0_AECS5 (1 << 11) 31#define PINMUX0_AECS4 (1 << 10) 32 33#define PINMUX1_I2C (1 << 7) 34#define PINMUX1_UART1 (1 << 1) 35#define PINMUX1_UART0 (1 << 0) 36 37/* 38 * The DM6446 includes two separate power domains: "Always On" and "DSP". The 39 * "Always On" power domain is always on when the chip is on. The "Always On" 40 * domain is powered by the VDD pins of the DM6446. The majority of the 41 * DM6446's modules lie within the "Always On" power domain. A separate 42 * domain called the "DSP" domain houses the C64x+ and VICP. The "DSP" domain 43 * is not always on. The "DSP" power domain is powered by the CVDDDSP pins of 44 * the DM6446. 45 */ 46 47/* Works on Always On power domain only (no PD argument) */ 48void lpsc_on(unsigned int id) 49{ 50 dv_reg_p mdstat, mdctl; 51 52 if (id >= DAVINCI_LPSC_GEM) 53 return; /* Don't work on DSP Power Domain */ 54 55 mdstat = REG_P(PSC_MDSTAT_BASE + (id * 4)); 56 mdctl = REG_P(PSC_MDCTL_BASE + (id * 4)); 57 58 while (REG(PSC_PTSTAT) & 0x01); 59 60 if ((*mdstat & 0x1f) == 0x03) 61 return; /* Already on and enabled */ 62 63 *mdctl |= 0x03; 64 65 /* Special treatment for some modules as for sprue14 p.7.4.2 */ 66 switch (id) { 67 case DAVINCI_LPSC_VPSSSLV: 68 case DAVINCI_LPSC_EMAC: 69 case DAVINCI_LPSC_EMAC_WRAPPER: 70 case DAVINCI_LPSC_MDIO: 71 case DAVINCI_LPSC_USB: 72 case DAVINCI_LPSC_ATA: 73 case DAVINCI_LPSC_VLYNQ: 74 case DAVINCI_LPSC_UHPI: 75 case DAVINCI_LPSC_DDR_EMIF: 76 case DAVINCI_LPSC_AEMIF: 77 case DAVINCI_LPSC_MMC_SD: 78 case DAVINCI_LPSC_MEMSTICK: 79 case DAVINCI_LPSC_McBSP: 80 case DAVINCI_LPSC_GPIO: 81 *mdctl |= 0x200; 82 break; 83 } 84 85 REG(PSC_PTCMD) = 0x01; 86 87 while (REG(PSC_PTSTAT) & 0x03); 88 while ((*mdstat & 0x1f) != 0x03); /* Probably an overkill... */ 89} 90 91/* If DSPLINK is used, we don't want U-Boot to power on the DSP. */ 92#if !defined(CONFIG_SYS_USE_DSPLINK) 93void dsp_on(void) 94{ 95 int i; 96 97 if (REG(PSC_PDSTAT1) & 0x1f) 98 return; /* Already on */ 99 100 REG(PSC_GBLCTL) |= 0x01; 101 REG(PSC_PDCTL1) |= 0x01; 102 REG(PSC_PDCTL1) &= ~0x100; 103 REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_GEM * 4)) |= 0x03; 104 REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_GEM * 4)) &= 0xfffffeff; 105 REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_IMCOP * 4)) |= 0x03; 106 REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_IMCOP * 4)) &= 0xfffffeff; 107 REG(PSC_PTCMD) = 0x02; 108 109 for (i = 0; i < 100; i++) { 110 if (REG(PSC_EPCPR) & 0x02) 111 break; 112 } 113 114 REG(PSC_CHP_SHRTSW) = 0x01; 115 REG(PSC_PDCTL1) |= 0x100; 116 REG(PSC_EPCCR) = 0x02; 117 118 for (i = 0; i < 100; i++) { 119 if (!(REG(PSC_PTSTAT) & 0x02)) 120 break; 121 } 122 123 REG(PSC_GBLCTL) &= ~0x1f; 124} 125#endif /* CONFIG_SYS_USE_DSPLINK */ 126 127void davinci_enable_uart0(void) 128{ 129 lpsc_on(DAVINCI_LPSC_UART0); 130 131 /* Bringup UART0 out of reset */ 132 REG(UART0_PWREMU_MGMT) = 0x0000e003; 133 134 /* Enable UART0 MUX lines */ 135 REG(PINMUX1) |= PINMUX1_UART0; 136} 137 138#ifdef CONFIG_DRIVER_TI_EMAC 139void davinci_enable_emac(void) 140{ 141 lpsc_on(DAVINCI_LPSC_EMAC); 142 lpsc_on(DAVINCI_LPSC_EMAC_WRAPPER); 143 lpsc_on(DAVINCI_LPSC_MDIO); 144 145 /* Enable GIO3.3V cells used for EMAC */ 146 REG(VDD3P3V_PWDN) = 0; 147 148 /* Enable EMAC. */ 149 REG(PINMUX0) |= PINMUX0_EMACEN; 150} 151#endif 152 153void davinci_enable_i2c(void) 154{ 155 lpsc_on(DAVINCI_LPSC_I2C); 156 157 /* Enable I2C pin Mux */ 158 REG(PINMUX1) |= PINMUX1_I2C; 159} 160 161void davinci_errata_workarounds(void) 162{ 163 /* 164 * Workaround for TMS320DM6446 errata 1.3.22: 165 * PSC: PTSTAT Register Does Not Clear After Warm/Maximum Reset 166 * Revision(s) Affected: 1.3 and earlier 167 */ 168 REG(PSC_SILVER_BULLET) = 0; 169 170 /* 171 * Set the PR_OLD_COUNT bits in the Bus Burst Priority Register (PBBPR) 172 * as suggested in TMS320DM6446 errata 2.1.2: 173 * 174 * On DM6446 Silicon Revision 2.1 and earlier, under certain conditions 175 * low priority modules can occupy the bus and prevent high priority 176 * modules like the VPSS from getting the required DDR2 throughput. 177 * A hex value of 0x20 should provide a good ARM (cache enabled) 178 * performance and still allow good utilization by the VPSS or other 179 * modules. 180 */ 181 REG(VBPR) = 0x20; 182} 183