1 /*====================================================================== 2 3 Device driver for the PCMCIA control functionality of StrongARM 4 SA-1100 microprocessors. 5 6 The contents of this file are subject to the Mozilla Public 7 License Version 1.1 (the "License"); you may not use this file 8 except in compliance with the License. You may obtain a copy of 9 the License at http://www.mozilla.org/MPL/ 10 11 Software distributed under the License is distributed on an "AS 12 IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or 13 implied. See the License for the specific language governing 14 rights and limitations under the License. 15 16 The initial developer of the original code is John G. Dorsey 17 <john+@cs.cmu.edu>. Portions created by John G. Dorsey are 18 Copyright (C) 1999 John G. Dorsey. All Rights Reserved. 19 20 Alternatively, the contents of this file may be used under the 21 terms of the GNU Public License version 2 (the "GPL"), in which 22 case the provisions of the GPL are applicable instead of the 23 above. If you wish to allow the use of your version of this file 24 only under the terms of the GPL and not to allow others to use 25 your version of this file under the MPL, indicate your decision 26 by deleting the provisions above and replace them with the notice 27 and other provisions required by the GPL. If you do not delete 28 the provisions above, a recipient may use your version of this 29 file under either the MPL or the GPL. 30 31 ======================================================================*/ 32 33 #include <linux/module.h> 34 #include <linux/init.h> 35 #include <linux/cpufreq.h> 36 #include <linux/ioport.h> 37 #include <linux/kernel.h> 38 #include <linux/spinlock.h> 39 40 #include <mach/hardware.h> 41 #include <asm/io.h> 42 #include <asm/irq.h> 43 #include <asm/system.h> 44 45 #include "soc_common.h" 46 #include "sa11xx_base.h" 47 48 49 /* 50 * sa1100_pcmcia_default_mecr_timing 51 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 52 * 53 * Calculate MECR clock wait states for given CPU clock 54 * speed and command wait state. This function can be over- 55 * written by a board specific version. 56 * 57 * The default is to simply calculate the BS values as specified in 58 * the INTEL SA1100 development manual 59 * "Expansion Memory (PCMCIA) Configuration Register (MECR)" 60 * that's section 10.2.5 in _my_ version of the manual ;) 61 */ 62 static unsigned int 63 sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket *skt, 64 unsigned int cpu_speed, 65 unsigned int cmd_time) 66 { 67 return sa1100_pcmcia_mecr_bs(cmd_time, cpu_speed); 68 } 69 70 /* sa1100_pcmcia_set_mecr() 71 * ^^^^^^^^^^^^^^^^^^^^^^^^ 72 * 73 * set MECR value for socket <sock> based on this sockets 74 * io, mem and attribute space access speed. 75 * Call board specific BS value calculation to allow boards 76 * to tweak the BS values. 77 */ 78 static int 79 sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket *skt, unsigned int cpu_clock) 80 { 81 struct soc_pcmcia_timing timing; 82 u32 mecr, old_mecr; 83 unsigned long flags; 84 unsigned int bs_io, bs_mem, bs_attr; 85 86 soc_common_pcmcia_get_timing(skt, &timing); 87 88 bs_io = skt->ops->get_timing(skt, cpu_clock, timing.io); 89 bs_mem = skt->ops->get_timing(skt, cpu_clock, timing.mem); 90 bs_attr = skt->ops->get_timing(skt, cpu_clock, timing.attr); 91 92 local_irq_save(flags); 93 94 old_mecr = mecr = MECR; 95 MECR_FAST_SET(mecr, skt->nr, 0); 96 MECR_BSIO_SET(mecr, skt->nr, bs_io); 97 MECR_BSA_SET(mecr, skt->nr, bs_attr); 98 MECR_BSM_SET(mecr, skt->nr, bs_mem); 99 if (old_mecr != mecr) 100 MECR = mecr; 101 102 local_irq_restore(flags); 103 104 debug(skt, 2, "FAST %X BSM %X BSA %X BSIO %X\n", 105 MECR_FAST_GET(mecr, skt->nr), 106 MECR_BSM_GET(mecr, skt->nr), MECR_BSA_GET(mecr, skt->nr), 107 MECR_BSIO_GET(mecr, skt->nr)); 108 109 return 0; 110 } 111 112 #ifdef CONFIG_CPU_FREQ 113 static int 114 sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket *skt, 115 unsigned long val, 116 struct cpufreq_freqs *freqs) 117 { 118 switch (val) { 119 case CPUFREQ_PRECHANGE: 120 if (freqs->new > freqs->old) 121 sa1100_pcmcia_set_mecr(skt, freqs->new); 122 break; 123 124 case CPUFREQ_POSTCHANGE: 125 if (freqs->new < freqs->old) 126 sa1100_pcmcia_set_mecr(skt, freqs->new); 127 break; 128 case CPUFREQ_RESUMECHANGE: 129 sa1100_pcmcia_set_mecr(skt, freqs->new); 130 break; 131 } 132 133 return 0; 134 } 135 136 #endif 137 138 static int 139 sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt) 140 { 141 return sa1100_pcmcia_set_mecr(skt, cpufreq_get(0)); 142 } 143 144 static int 145 sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf) 146 { 147 struct soc_pcmcia_timing timing; 148 unsigned int clock = cpufreq_get(0); 149 unsigned long mecr = MECR; 150 char *p = buf; 151 152 soc_common_pcmcia_get_timing(skt, &timing); 153 154 p+=sprintf(p, "I/O : %u (%u)\n", timing.io, 155 sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr))); 156 157 p+=sprintf(p, "attribute: %u (%u)\n", timing.attr, 158 sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr))); 159 160 p+=sprintf(p, "common : %u (%u)\n", timing.mem, 161 sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr))); 162 163 return p - buf; 164 } 165 166 int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops, 167 int first, int nr) 168 { 169 /* 170 * set default MECR calculation if the board specific 171 * code did not specify one... 172 */ 173 if (!ops->get_timing) 174 ops->get_timing = sa1100_pcmcia_default_mecr_timing; 175 176 /* Provide our SA11x0 specific timing routines. */ 177 ops->set_timing = sa1100_pcmcia_set_timing; 178 ops->show_timing = sa1100_pcmcia_show_timing; 179 #ifdef CONFIG_CPU_FREQ 180 ops->frequency_change = sa1100_pcmcia_frequency_change; 181 #endif 182 183 return soc_common_drv_pcmcia_probe(dev, ops, first, nr); 184 } 185 EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe); 186 187 static int __init sa11xx_pcmcia_init(void) 188 { 189 return 0; 190 } 191 fs_initcall(sa11xx_pcmcia_init); 192 193 static void __exit sa11xx_pcmcia_exit(void) {} 194 195 module_exit(sa11xx_pcmcia_exit); 196 197 MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>"); 198 MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver"); 199 MODULE_LICENSE("Dual MPL/GPL"); 200