sa11xx_base.c (7492B)
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#include <linux/io.h> 40#include <linux/slab.h> 41 42#include <mach/hardware.h> 43#include <asm/irq.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 */ 62static unsigned int 63sa1100_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 */ 78static int 79sa1100_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 113static int 114sa1100_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 } 129 130 return 0; 131} 132 133#endif 134 135static int 136sa1100_pcmcia_set_timing(struct soc_pcmcia_socket *skt) 137{ 138 unsigned long clk = clk_get_rate(skt->clk); 139 140 return sa1100_pcmcia_set_mecr(skt, clk / 1000); 141} 142 143static int 144sa1100_pcmcia_show_timing(struct soc_pcmcia_socket *skt, char *buf) 145{ 146 struct soc_pcmcia_timing timing; 147 unsigned int clock = clk_get_rate(skt->clk) / 1000; 148 unsigned long mecr = MECR; 149 char *p = buf; 150 151 soc_common_pcmcia_get_timing(skt, &timing); 152 153 p+=sprintf(p, "I/O : %uns (%uns)\n", timing.io, 154 sa1100_pcmcia_cmd_time(clock, MECR_BSIO_GET(mecr, skt->nr))); 155 156 p+=sprintf(p, "attribute: %uns (%uns)\n", timing.attr, 157 sa1100_pcmcia_cmd_time(clock, MECR_BSA_GET(mecr, skt->nr))); 158 159 p+=sprintf(p, "common : %uns (%uns)\n", timing.mem, 160 sa1100_pcmcia_cmd_time(clock, MECR_BSM_GET(mecr, skt->nr))); 161 162 return p - buf; 163} 164 165static const char *skt_names[] = { 166 "PCMCIA socket 0", 167 "PCMCIA socket 1", 168}; 169 170#define SKT_DEV_INFO_SIZE(n) \ 171 (sizeof(struct skt_dev_info) + (n)*sizeof(struct soc_pcmcia_socket)) 172 173int sa11xx_drv_pcmcia_add_one(struct soc_pcmcia_socket *skt) 174{ 175 skt->res_skt.start = _PCMCIA(skt->nr); 176 skt->res_skt.end = _PCMCIA(skt->nr) + PCMCIASp - 1; 177 skt->res_skt.name = skt_names[skt->nr]; 178 skt->res_skt.flags = IORESOURCE_MEM; 179 180 skt->res_io.start = _PCMCIAIO(skt->nr); 181 skt->res_io.end = _PCMCIAIO(skt->nr) + PCMCIAIOSp - 1; 182 skt->res_io.name = "io"; 183 skt->res_io.flags = IORESOURCE_MEM | IORESOURCE_BUSY; 184 185 skt->res_mem.start = _PCMCIAMem(skt->nr); 186 skt->res_mem.end = _PCMCIAMem(skt->nr) + PCMCIAMemSp - 1; 187 skt->res_mem.name = "memory"; 188 skt->res_mem.flags = IORESOURCE_MEM; 189 190 skt->res_attr.start = _PCMCIAAttr(skt->nr); 191 skt->res_attr.end = _PCMCIAAttr(skt->nr) + PCMCIAAttrSp - 1; 192 skt->res_attr.name = "attribute"; 193 skt->res_attr.flags = IORESOURCE_MEM; 194 195 return soc_pcmcia_add_one(skt); 196} 197EXPORT_SYMBOL(sa11xx_drv_pcmcia_add_one); 198 199void sa11xx_drv_pcmcia_ops(struct pcmcia_low_level *ops) 200{ 201 /* 202 * set default MECR calculation if the board specific 203 * code did not specify one... 204 */ 205 if (!ops->get_timing) 206 ops->get_timing = sa1100_pcmcia_default_mecr_timing; 207 208 /* Provide our SA11x0 specific timing routines. */ 209 ops->set_timing = sa1100_pcmcia_set_timing; 210 ops->show_timing = sa1100_pcmcia_show_timing; 211#ifdef CONFIG_CPU_FREQ 212 ops->frequency_change = sa1100_pcmcia_frequency_change; 213#endif 214} 215EXPORT_SYMBOL(sa11xx_drv_pcmcia_ops); 216 217int sa11xx_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops, 218 int first, int nr) 219{ 220 struct skt_dev_info *sinfo; 221 struct soc_pcmcia_socket *skt; 222 int i, ret = 0; 223 struct clk *clk; 224 225 clk = devm_clk_get(dev, NULL); 226 if (IS_ERR(clk)) 227 return PTR_ERR(clk); 228 229 sa11xx_drv_pcmcia_ops(ops); 230 231 sinfo = devm_kzalloc(dev, SKT_DEV_INFO_SIZE(nr), GFP_KERNEL); 232 if (!sinfo) 233 return -ENOMEM; 234 235 sinfo->nskt = nr; 236 237 /* Initialize processor specific parameters */ 238 for (i = 0; i < nr; i++) { 239 skt = &sinfo->skt[i]; 240 241 skt->nr = first + i; 242 skt->clk = clk; 243 soc_pcmcia_init_one(skt, ops, dev); 244 245 ret = sa11xx_drv_pcmcia_add_one(skt); 246 if (ret) 247 break; 248 } 249 250 if (ret) { 251 while (--i >= 0) 252 soc_pcmcia_remove_one(&sinfo->skt[i]); 253 } else { 254 dev_set_drvdata(dev, sinfo); 255 } 256 257 return ret; 258} 259EXPORT_SYMBOL(sa11xx_drv_pcmcia_probe); 260 261MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>"); 262MODULE_DESCRIPTION("Linux PCMCIA Card Services: SA-11xx core socket driver"); 263MODULE_LICENSE("Dual MPL/GPL");