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/config.h> 36 #include <linux/cpufreq.h> 37 #include <linux/ioport.h> 38 #include <linux/kernel.h> 39 #include <linux/spinlock.h> 40 41 #include <asm/hardware.h> 42 #include <asm/io.h> 43 #include <asm/irq.h> 44 #include <asm/system.h> 45 46 #include "soc_common.h" 47 #include "sa11xx_base.h" 48 49 50 /* 51 * sa1100_pcmcia_default_mecr_timing 52 * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 53 * 54 * Calculate MECR clock wait states for given CPU clock 55 * speed and command wait state. This function can be over- 56 * written by a board specific version. 57 * 58 * The default is to simply calculate the BS values as specified in 59 * the INTEL SA1100 development manual 60 * "Expansion Memory (PCMCIA) Configuration Register (MECR)" 61 * that's section 10.2.5 in _my_ version of the manual ;) 62 */ 63 static unsigned int 64 sa1100_pcmcia_default_mecr_timing(struct soc_pcmcia_socket *skt, 65 unsigned int cpu_speed, 66 unsigned int cmd_time) 67 { 68 return sa1100_pcmcia_mecr_bs(cmd_time, cpu_speed); 69 } 70 71 /* sa1100_pcmcia_set_mecr() 72 * ^^^^^^^^^^^^^^^^^^^^^^^^ 73 * 74 * set MECR value for socket <sock> based on this sockets 75 * io, mem and attribute space access speed. 76 * Call board specific BS value calculation to allow boards 77 * to tweak the BS values. 78 */ 79 static int 80 sa1100_pcmcia_set_mecr(struct soc_pcmcia_socket *skt, unsigned int cpu_clock) 81 { 82 struct soc_pcmcia_timing timing; 83 u32 mecr, old_mecr; 84 unsigned long flags; 85 unsigned int bs_io, bs_mem, bs_attr; 86 87 soc_common_pcmcia_get_timing(skt, &timing); 88 89 bs_io = skt->ops->get_timing(skt, cpu_clock, timing.io); 90 bs_mem = skt->ops->get_timing(skt, cpu_clock, timing.mem); 91 bs_attr = skt->ops->get_timing(skt, cpu_clock, timing.attr); 92 93 local_irq_save(flags); 94 95 old_mecr = mecr = MECR; 96 MECR_FAST_SET(mecr, skt->nr, 0); 97 MECR_BSIO_SET(mecr, skt->nr, bs_io); 98 MECR_BSA_SET(mecr, skt->nr, bs_attr); 99 MECR_BSM_SET(mecr, skt->nr, bs_mem); 100 if (old_mecr != mecr) 101 MECR = mecr; 102 103 local_irq_restore(flags); 104 105 debug(skt, 2, "FAST %X BSM %X BSA %X BSIO %X\n", 106 MECR_FAST_GET(mecr, skt->nr), 107 MECR_BSM_GET(mecr, skt->nr), MECR_BSA_GET(mecr, skt->nr), 108 MECR_BSIO_GET(mecr, skt->nr)); 109 110 return 0; 111 } 112 113 #ifdef CONFIG_CPU_FREQ 114 static int 115 sa1100_pcmcia_frequency_change(struct soc_pcmcia_socket *skt, 116 unsigned long val, 117 struct cpufreq_freqs *freqs) 118 { 119 switch (val) { 120 case CPUFREQ_PRECHANGE: 121 if (freqs->new > freqs->old) 122 sa1100_pcmcia_set_mecr(skt, freqs->new); 123 break; 124 125 case CPUFREQ_POSTCHANGE: 126 if (freqs->new < freqs->old) 127 sa1100_pcmcia_set_mecr(skt, freqs->new); 128 break; 129 case CPUFREQ_RESUMECHANGE: 130 sa1100_pcmcia_set_mecr(skt, freqs->new); 131 break; 132 } 133 134 return 0; 135 } 136 137 #endif 138 139 static int 140 sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt) 141 { 142 return sa1100_pcmcia_set_mecr(skt, cpufreq_get(0)); 143 } 144 145 static int 146 sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf) 147 { 148 struct soc_pcmcia_timing timing; 149 unsigned int clock = cpufreq_get(0); 150 unsigned long mecr = MECR; 151 char *p = buf; 152 153 soc_common_pcmcia_get_timing(skt, &timing); 154 155 p+=sprintf(p, "I/O : %u (%u)\n", timing.io, 156 sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr))); 157 158 p+=sprintf(p, "attribute: %u (%u)\n", timing.attr, 159 sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr))); 160 161 p+=sprintf(p, "common : %u (%u)\n", timing.mem, 162 sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr))); 163 164 return p - buf; 165 } 166 167 int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops, 168 int first, int nr) 169 { 170 /* 171 * set default MECR calculation if the board specific 172 * code did not specify one... 173 */ 174 if (!ops->get_timing) 175 ops->get_timing = sa1100_pcmcia_default_mecr_timing; 176 177 /* Provide our SA11x0 specific timing routines. */ 178 ops->set_timing = sa1100_pcmcia_set_timing; 179 ops->show_timing = sa1100_pcmcia_show_timing; 180 #ifdef CONFIG_CPU_FREQ 181 ops->frequency_change = sa1100_pcmcia_frequency_change; 182 #endif 183 184 return soc_common_drv_pcmcia_probe(dev, ops, first, nr); 185 } 186 EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe); 187 188 static int __init sa11xx_pcmcia_init(void) 189 { 190 return 0; 191 } 192 module_init(sa11xx_pcmcia_init); 193 194 static void __exit sa11xx_pcmcia_exit(void) {} 195 196 module_exit(sa11xx_pcmcia_exit); 197 198 MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>"); 199 MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver"); 200 MODULE_LICENSE("Dual MPL/GPL"); 201