2 * linux/arch/arm/mach-omap2/prcm.c
4 * OMAP 24xx Power Reset and Clock Management (PRCM) functions
6 * Copyright (C) 2005 Nokia Corporation
8 * Written by Tony Lindgren <tony.lindgren@nokia.com>
10 * Copyright (C) 2007 Texas Instruments, Inc.
11 * Rajendra Nayak <rnayak@ti.com>
13 * Some pieces of code Copyright (C) 2005 Texas Instruments, Inc.
14 * Upgraded with OMAP4 support by Abhijit Pagare <abhijitpagare@ti.com>
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License version 2 as
18 * published by the Free Software Foundation.
21 #include <linux/kernel.h>
22 #include <linux/init.h>
23 #include <linux/clk.h>
25 #include <linux/delay.h>
27 #include <plat/common.h>
28 #include <plat/prcm.h>
29 #include <plat/irqs.h>
32 #include "clock2xxx.h"
33 #include "cm2xxx_3xxx.h"
34 #include "prm2xxx_3xxx.h"
36 #include "prminst44xx.h"
37 #include "prm-regbits-24xx.h"
38 #include "prm-regbits-44xx.h"
41 void __iomem *prm_base;
42 void __iomem *cm_base;
43 void __iomem *cm2_base;
45 #define MAX_MODULE_ENABLE_WAIT 100000
47 u32 omap_prcm_get_reset_sources(void)
49 /* XXX This presumably needs modification for 34XX */
50 if (cpu_is_omap24xx() || cpu_is_omap34xx())
51 return omap2_prm_read_mod_reg(WKUP_MOD, OMAP2_RM_RSTST) & 0x7f;
52 if (cpu_is_omap44xx())
53 return omap2_prm_read_mod_reg(WKUP_MOD, OMAP4_RM_RSTST) & 0x7f;
57 EXPORT_SYMBOL(omap_prcm_get_reset_sources);
59 /* Resets clock rates and reboots the system. Only called from system.h */
60 void omap_prcm_arch_reset(char mode, const char *cmd)
64 if (cpu_is_omap24xx()) {
65 omap2xxx_clk_prepare_for_reboot();
68 } else if (cpu_is_omap34xx()) {
69 prcm_offs = OMAP3430_GR_MOD;
70 omap3_ctrl_write_boot_mode((cmd ? (u8)*cmd : 0));
71 } else if (cpu_is_omap44xx()) {
72 omap4_prm_global_warm_sw_reset(); /* never returns */
77 /* XXX should be moved to some OMAP2/3 specific code */
78 omap2_prm_set_mod_reg_bits(OMAP_RST_DPLL3_MASK, prcm_offs,
80 omap2_prm_read_mod_reg(prcm_offs, OMAP2_RM_RSTCTRL); /* OCP barrier */
84 * omap2_cm_wait_idlest - wait for IDLEST bit to indicate module readiness
85 * @reg: physical address of module IDLEST register
86 * @mask: value to mask against to determine if the module is active
87 * @idlest: idle state indicator (0 or 1) for the clock
88 * @name: name of the clock (for printk)
90 * Returns 1 if the module indicated readiness in time, or 0 if it
91 * failed to enable in roughly MAX_MODULE_ENABLE_WAIT microseconds.
93 * XXX This function is deprecated. It should be removed once the
94 * hwmod conversion is complete.
96 int omap2_cm_wait_idlest(void __iomem *reg, u32 mask, u8 idlest,
108 omap_test_timeout(((__raw_readl(reg) & mask) == ena),
109 MAX_MODULE_ENABLE_WAIT, i);
111 if (i < MAX_MODULE_ENABLE_WAIT)
112 pr_debug("cm: Module associated with clock %s ready after %d "
115 pr_err("cm: Module associated with clock %s didn't enable in "
116 "%d tries\n", name, MAX_MODULE_ENABLE_WAIT);
118 return (i < MAX_MODULE_ENABLE_WAIT) ? 1 : 0;
121 void __init omap2_set_globals_prcm(struct omap_globals *omap2_globals)
123 /* Static mapping, never released */
124 if (omap2_globals->prm) {
125 prm_base = ioremap(omap2_globals->prm, SZ_8K);
128 if (omap2_globals->cm) {
129 cm_base = ioremap(omap2_globals->cm, SZ_8K);
132 if (omap2_globals->cm2) {
133 cm2_base = ioremap(omap2_globals->cm2, SZ_8K);