aboutsummaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-sa1100/cpu-sa1100.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-sa1100/cpu-sa1100.c')
-rw-r--r--arch/arm/mach-sa1100/cpu-sa1100.c20
1 files changed, 10 insertions, 10 deletions
diff --git a/arch/arm/mach-sa1100/cpu-sa1100.c b/arch/arm/mach-sa1100/cpu-sa1100.c
index 244d5956312c..ef817876a5d6 100644
--- a/arch/arm/mach-sa1100/cpu-sa1100.c
+++ b/arch/arm/mach-sa1100/cpu-sa1100.c
@@ -3,17 +3,17 @@
3 * 3 *
4 * Copyright (C) 2000 2001, The Delft University of Technology 4 * Copyright (C) 2000 2001, The Delft University of Technology
5 * 5 *
6 * Authors: 6 * Authors:
7 * - Johan Pouwelse (J.A.Pouwelse@its.tudelft.nl): initial version 7 * - Johan Pouwelse (J.A.Pouwelse@its.tudelft.nl): initial version
8 * - Erik Mouw (J.A.K.Mouw@its.tudelft.nl): 8 * - Erik Mouw (J.A.K.Mouw@its.tudelft.nl):
9 * - major rewrite for linux-2.3.99 9 * - major rewrite for linux-2.3.99
10 * - rewritten for the more generic power management scheme in 10 * - rewritten for the more generic power management scheme in
11 * linux-2.4.5-rmk1 11 * linux-2.4.5-rmk1
12 * 12 *
13 * This software has been developed while working on the LART 13 * This software has been developed while working on the LART
14 * computing board (http://www.lartmaker.nl/), which is 14 * computing board (http://www.lartmaker.nl/), which is
15 * sponsored by the Mobile Multi-media Communications 15 * sponsored by the Mobile Multi-media Communications
16 * (http://www.mmc.tudelft.nl/) and Ubiquitous Communications 16 * (http://www.mmc.tudelft.nl/) and Ubiquitous Communications
17 * (http://www.ubicom.tudelft.nl/) projects. 17 * (http://www.ubicom.tudelft.nl/) projects.
18 * 18 *
19 * The authors can be reached at: 19 * The authors can be reached at:
@@ -36,7 +36,7 @@
36 * but WITHOUT ANY WARRANTY; without even the implied warranty of 36 * but WITHOUT ANY WARRANTY; without even the implied warranty of
37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 * GNU General Public License for more details. 38 * GNU General Public License for more details.
39 * 39 *
40 * You should have received a copy of the GNU General Public License 40 * You should have received a copy of the GNU General Public License
41 * along with this program; if not, write to the Free Software 41 * along with this program; if not, write to the Free Software
42 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 42 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
@@ -44,7 +44,7 @@
44 * 44 *
45 * Theory of operations 45 * Theory of operations
46 * ==================== 46 * ====================
47 * 47 *
48 * Clock scaling can be used to lower the power consumption of the CPU 48 * Clock scaling can be used to lower the power consumption of the CPU
49 * core. This will give you a somewhat longer running time. 49 * core. This will give you a somewhat longer running time.
50 * 50 *
@@ -58,11 +58,11 @@
58 * MDCNFG 0xA0000000 DRAM config 58 * MDCNFG 0xA0000000 DRAM config
59 * MDCAS0 0xA0000004 Access waveform 59 * MDCAS0 0xA0000004 Access waveform
60 * MDCAS1 0xA0000008 Access waveform 60 * MDCAS1 0xA0000008 Access waveform
61 * MDCAS2 0xA000000C Access waveform 61 * MDCAS2 0xA000000C Access waveform
62 * 62 *
63 * Care must be taken to change the DRAM parameters the correct way, 63 * Care must be taken to change the DRAM parameters the correct way,
64 * because otherwise the DRAM becomes unusable and the kernel will 64 * because otherwise the DRAM becomes unusable and the kernel will
65 * crash. 65 * crash.
66 * 66 *
67 * The simple solution to avoid a kernel crash is to put the actual 67 * The simple solution to avoid a kernel crash is to put the actual
68 * clock change in ROM and jump to that code from the kernel. The main 68 * clock change in ROM and jump to that code from the kernel. The main
@@ -75,7 +75,7 @@
75 * as long as all re-configuration steps yield a valid DRAM 75 * as long as all re-configuration steps yield a valid DRAM
76 * configuration. The advantages are clear: it will run on all SA-1100 76 * configuration. The advantages are clear: it will run on all SA-1100
77 * platforms, and the code is very simple. 77 * platforms, and the code is very simple.
78 * 78 *
79 * If you really want to understand what is going on in 79 * If you really want to understand what is going on in
80 * sa1100_update_dram_timings(), you'll have to read sections 8.2, 80 * sa1100_update_dram_timings(), you'll have to read sections 8.2,
81 * 9.5.7.3, and 10.2 from the "Intel StrongARM SA-1100 Microprocessor 81 * 9.5.7.3, and 10.2 from the "Intel StrongARM SA-1100 Microprocessor
@@ -97,7 +97,7 @@
97typedef struct { 97typedef struct {
98 int speed; 98 int speed;
99 u32 mdcnfg; 99 u32 mdcnfg;
100 u32 mdcas0; 100 u32 mdcas0;
101 u32 mdcas1; 101 u32 mdcas1;
102 u32 mdcas2; 102 u32 mdcas2;
103} sa1100_dram_regs_t; 103} sa1100_dram_regs_t;
@@ -147,7 +147,7 @@ static void sa1100_update_dram_timings(int current_speed, int new_speed)
147 /* No risk, no fun: run with interrupts on! */ 147 /* No risk, no fun: run with interrupts on! */
148 if (new_speed > current_speed) { 148 if (new_speed > current_speed) {
149 /* We're going FASTER, so first relax the memory 149 /* We're going FASTER, so first relax the memory
150 * timings before changing the core frequency 150 * timings before changing the core frequency
151 */ 151 */
152 152
153 /* Half the memory access clock */ 153 /* Half the memory access clock */