1 /*
2 * linux/arch/arm/mach-omap2/prcm.c
3 *
4 * OMAP 24xx Power Reset and Clock Management (PRCM) functions
5 *
6 * Copyright (C) 2005 Nokia Corporation
7 *
8 * Written by Tony Lindgren <tony.lindgren@nokia.com>
9 *
10 * Some pieces of code Copyright (C) 2005 Texas Instruments, Inc.
11 *
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License version 2 as
14 * published by the Free Software Foundation.
15 */
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/clk.h>
19 #include <linux/io.h>
20
21 #include <mach/common.h>
22 #include <mach/prcm.h>
23
24 #include "clock.h"
25 #include "prm.h"
26 #include "prm-regbits-24xx.h"
27
28 static void __iomem *prm_base;
29 static void __iomem *cm_base;
30
omap_prcm_get_reset_sources(void)31 u32 omap_prcm_get_reset_sources(void)
32 {
33 /* XXX This presumably needs modification for 34XX */
34 return prm_read_mod_reg(WKUP_MOD, RM_RSTST) & 0x7f;
35 }
36 EXPORT_SYMBOL(omap_prcm_get_reset_sources);
37
38 /* Resets clock rates and reboots the system. Only called from system.h */
omap_prcm_arch_reset(char mode)39 void omap_prcm_arch_reset(char mode)
40 {
41 s16 prcm_offs;
42 omap2_clk_prepare_for_reboot();
43
44 if (cpu_is_omap24xx())
45 prcm_offs = WKUP_MOD;
46 else if (cpu_is_omap34xx())
47 prcm_offs = OMAP3430_GR_MOD;
48 else
49 WARN_ON(1);
50
51 prm_set_mod_reg_bits(OMAP_RST_DPLL3, prcm_offs, RM_RSTCTRL);
52 }
53
__omap_prcm_read(void __iomem * base,s16 module,u16 reg)54 static inline u32 __omap_prcm_read(void __iomem *base, s16 module, u16 reg)
55 {
56 BUG_ON(!base);
57 return __raw_readl(base + module + reg);
58 }
59
__omap_prcm_write(u32 value,void __iomem * base,s16 module,u16 reg)60 static inline void __omap_prcm_write(u32 value, void __iomem *base,
61 s16 module, u16 reg)
62 {
63 BUG_ON(!base);
64 __raw_writel(value, base + module + reg);
65 }
66
67 /* Read a register in a PRM module */
prm_read_mod_reg(s16 module,u16 idx)68 u32 prm_read_mod_reg(s16 module, u16 idx)
69 {
70 return __omap_prcm_read(prm_base, module, idx);
71 }
72 EXPORT_SYMBOL(prm_read_mod_reg);
73
74 /* Write into a register in a PRM module */
prm_write_mod_reg(u32 val,s16 module,u16 idx)75 void prm_write_mod_reg(u32 val, s16 module, u16 idx)
76 {
77 __omap_prcm_write(val, prm_base, module, idx);
78 }
79 EXPORT_SYMBOL(prm_write_mod_reg);
80
81 /* Read-modify-write a register in a PRM module. Caller must lock */
prm_rmw_mod_reg_bits(u32 mask,u32 bits,s16 module,s16 idx)82 u32 prm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
83 {
84 u32 v;
85
86 v = prm_read_mod_reg(module, idx);
87 v &= ~mask;
88 v |= bits;
89 prm_write_mod_reg(v, module, idx);
90
91 return v;
92 }
93 EXPORT_SYMBOL(prm_rmw_mod_reg_bits);
94
95 /* Read a register in a CM module */
cm_read_mod_reg(s16 module,u16 idx)96 u32 cm_read_mod_reg(s16 module, u16 idx)
97 {
98 return __omap_prcm_read(cm_base, module, idx);
99 }
100 EXPORT_SYMBOL(cm_read_mod_reg);
101
102 /* Write into a register in a CM module */
cm_write_mod_reg(u32 val,s16 module,u16 idx)103 void cm_write_mod_reg(u32 val, s16 module, u16 idx)
104 {
105 __omap_prcm_write(val, cm_base, module, idx);
106 }
107 EXPORT_SYMBOL(cm_write_mod_reg);
108
109 /* Read-modify-write a register in a CM module. Caller must lock */
cm_rmw_mod_reg_bits(u32 mask,u32 bits,s16 module,s16 idx)110 u32 cm_rmw_mod_reg_bits(u32 mask, u32 bits, s16 module, s16 idx)
111 {
112 u32 v;
113
114 v = cm_read_mod_reg(module, idx);
115 v &= ~mask;
116 v |= bits;
117 cm_write_mod_reg(v, module, idx);
118
119 return v;
120 }
121 EXPORT_SYMBOL(cm_rmw_mod_reg_bits);
122
omap2_set_globals_prcm(struct omap_globals * omap2_globals)123 void __init omap2_set_globals_prcm(struct omap_globals *omap2_globals)
124 {
125 prm_base = omap2_globals->prm;
126 cm_base = omap2_globals->cm;
127 }
128