1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Power and Sleep Controller (PSC) functions. 4 * 5 * Copyright (C) 2007 Sergey Kubushyn <ksi (at) koi8.net> 6 * Copyright (C) 2008 Lyrtech <www.lyrtech.com> 7 * Copyright (C) 2004 Texas Instruments. 8 */ 9 10 #include <common.h> 11 #include <asm/arch/hardware.h> 12 #include <asm/io.h> 13 14 /* 15 * The PSC manages three inputs to a "module" which may be a peripheral or 16 * CPU. Those inputs are the module's: clock; reset signal; and sometimes 17 * its power domain. For our purposes, we only care whether clock and power 18 * are active, and the module is out of reset. 19 * 20 * DaVinci chips may include two separate power domains: "Always On" and "DSP". 21 * Chips without a DSP generally have only one domain. 22 * 23 * The "Always On" power domain is always on when the chip is on, and is 24 * powered by the VDD pins (on DM644X). The majority of DaVinci modules 25 * lie within the "Always On" power domain. 26 * 27 * A separate domain called the "DSP" domain houses the C64x+ and other video 28 * hardware such as VICP. In some chips, the "DSP" domain is not always on. 29 * The "DSP" power domain is powered by the CVDDDSP pins (on DM644X). 30 */ 31 32 /* Works on Always On power domain only (no PD argument) */ 33 static void lpsc_transition(unsigned int id, unsigned int state) 34 { 35 dv_reg_p mdstat, mdctl, ptstat, ptcmd; 36 #ifdef CONFIG_SOC_DA8XX 37 struct davinci_psc_regs *psc_regs; 38 #endif 39 40 #ifndef CONFIG_SOC_DA8XX 41 if (id >= DAVINCI_LPSC_GEM) 42 return; /* Don't work on DSP Power Domain */ 43 44 mdstat = REG_P(PSC_MDSTAT_BASE + (id * 4)); 45 mdctl = REG_P(PSC_MDCTL_BASE + (id * 4)); 46 ptstat = REG_P(PSC_PTSTAT); 47 ptcmd = REG_P(PSC_PTCMD); 48 #else 49 if (id < DAVINCI_LPSC_PSC1_BASE) { 50 if (id >= PSC_PSC0_MODULE_ID_CNT) 51 return; 52 psc_regs = davinci_psc0_regs; 53 mdstat = &psc_regs->psc0.mdstat[id]; 54 mdctl = &psc_regs->psc0.mdctl[id]; 55 } else { 56 id -= DAVINCI_LPSC_PSC1_BASE; 57 if (id >= PSC_PSC1_MODULE_ID_CNT) 58 return; 59 psc_regs = davinci_psc1_regs; 60 mdstat = &psc_regs->psc1.mdstat[id]; 61 mdctl = &psc_regs->psc1.mdctl[id]; 62 } 63 ptstat = &psc_regs->ptstat; 64 ptcmd = &psc_regs->ptcmd; 65 #endif 66 67 while (readl(ptstat) & 0x01) 68 continue; 69 70 if ((readl(mdstat) & PSC_MDSTAT_STATE) == state) 71 return; /* Already in that state */ 72 73 writel((readl(mdctl) & ~PSC_MDCTL_NEXT) | state, mdctl); 74 75 switch (id) { 76 #ifdef CONFIG_SOC_DM644X 77 /* Special treatment for some modules as for sprue14 p.7.4.2 */ 78 case DAVINCI_LPSC_VPSSSLV: 79 case DAVINCI_LPSC_EMAC: 80 case DAVINCI_LPSC_EMAC_WRAPPER: 81 case DAVINCI_LPSC_MDIO: 82 case DAVINCI_LPSC_USB: 83 case DAVINCI_LPSC_ATA: 84 case DAVINCI_LPSC_VLYNQ: 85 case DAVINCI_LPSC_UHPI: 86 case DAVINCI_LPSC_DDR_EMIF: 87 case DAVINCI_LPSC_AEMIF: 88 case DAVINCI_LPSC_MMC_SD: 89 case DAVINCI_LPSC_MEMSTICK: 90 case DAVINCI_LPSC_McBSP: 91 case DAVINCI_LPSC_GPIO: 92 writel(readl(mdctl) | 0x200, mdctl); 93 break; 94 #endif 95 } 96 97 writel(0x01, ptcmd); 98 99 while (readl(ptstat) & 0x01) 100 continue; 101 while ((readl(mdstat) & PSC_MDSTAT_STATE) != state) 102 continue; 103 } 104 105 void lpsc_on(unsigned int id) 106 { 107 lpsc_transition(id, 0x03); 108 } 109 110 void lpsc_syncreset(unsigned int id) 111 { 112 lpsc_transition(id, 0x01); 113 } 114 115 void lpsc_disable(unsigned int id) 116 { 117 lpsc_transition(id, 0x0); 118 } 119 120 /* Not all DaVinci chips have a DSP power domain. */ 121 #ifdef CONFIG_SOC_DM644X 122 123 /* If DSPLINK is used, we don't want U-Boot to power on the DSP. */ 124 #if !defined(CONFIG_SYS_USE_DSPLINK) 125 void dsp_on(void) 126 { 127 int i; 128 129 if (REG(PSC_PDSTAT1) & 0x1f) 130 return; /* Already on */ 131 132 REG(PSC_GBLCTL) |= 0x01; 133 REG(PSC_PDCTL1) |= 0x01; 134 REG(PSC_PDCTL1) &= ~0x100; 135 REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_GEM * 4)) |= 0x03; 136 REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_GEM * 4)) &= 0xfffffeff; 137 REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_IMCOP * 4)) |= 0x03; 138 REG(PSC_MDCTL_BASE + (DAVINCI_LPSC_IMCOP * 4)) &= 0xfffffeff; 139 REG(PSC_PTCMD) = 0x02; 140 141 for (i = 0; i < 100; i++) { 142 if (REG(PSC_EPCPR) & 0x02) 143 break; 144 } 145 146 REG(PSC_CHP_SHRTSW) = 0x01; 147 REG(PSC_PDCTL1) |= 0x100; 148 REG(PSC_EPCCR) = 0x02; 149 150 for (i = 0; i < 100; i++) { 151 if (!(REG(PSC_PTSTAT) & 0x02)) 152 break; 153 } 154 155 REG(PSC_GBLCTL) &= ~0x1f; 156 } 157 #endif /* CONFIG_SYS_USE_DSPLINK */ 158 159 #endif /* have a DSP */ 160