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