drivers/pcmcia/soc_common.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * linux/drivers/pcmcia/soc_common.h
   4  *
   5  * Copyright (C) 2000 John G Dorsey <john+@cs.cmu.edu>
   6  *
   7  * This file contains definitions for the PCMCIA support code common to
   8  * integrated SOCs like the SA-11x0 and PXA2xx microprocessors.
   9  */
  10 #ifndef _ASM_ARCH_PCMCIA
  11 #define _ASM_ARCH_PCMCIA
  12
  13 /* include the world */
  14 #include <linux/clk.h>
  15 #include <linux/cpufreq.h>
  16 #include <pcmcia/ss.h>
  17 #include <pcmcia/cistpl.h>
  18
  19
  20 struct device;
  21 struct gpio_desc;
  22 struct pcmcia_low_level;
  23 struct regulator;
  24
  25 struct soc_pcmcia_regulator {
  26         struct regulator        *reg;
  27         bool                    on;
  28 };
  29
  30 /*
  31  * This structure encapsulates per-socket state which we might need to
  32  * use when responding to a Card Services query of some kind.
  33  */
  34 struct soc_pcmcia_socket {
  35         struct pcmcia_socket    socket;
  36
  37         /*
  38          * Info from low level handler
  39          */
  40         unsigned int            nr;
  41         struct clk              *clk;
  42
  43         /*
  44          * Core PCMCIA state
  45          */
  46         const struct pcmcia_low_level *ops;
  47
  48         unsigned int            status;
  49         socket_state_t          cs_state;
  50
  51         unsigned short          spd_io[MAX_IO_WIN];
  52         unsigned short          spd_mem[MAX_WIN];
  53         unsigned short          spd_attr[MAX_WIN];
  54
  55         struct resource         res_skt;
  56         struct resource         res_io;
  57         struct resource         res_mem;
  58         struct resource         res_attr;
  59         void __iomem            *virt_io;
  60
  61         struct {
  62                 int             gpio;
  63                 struct gpio_desc *desc;
  64                 unsigned int    irq;
  65                 const char      *name;
  66         } stat[6];
  67 #define SOC_STAT_CD             0       /* Card detect */
  68 #define SOC_STAT_BVD1           1       /* BATDEAD / IOSTSCHG */
  69 #define SOC_STAT_BVD2           2       /* BATWARN / IOSPKR */
  70 #define SOC_STAT_RDY            3       /* Ready / Interrupt */
  71 #define SOC_STAT_VS1            4       /* Voltage sense 1 */
  72 #define SOC_STAT_VS2            5       /* Voltage sense 2 */
  73
  74         struct gpio_desc        *gpio_reset;
  75         struct gpio_desc        *gpio_bus_enable;
  76         struct soc_pcmcia_regulator vcc;
  77         struct soc_pcmcia_regulator vpp;
  78
  79         unsigned int            irq_state;
  80
  81 #ifdef CONFIG_CPU_FREQ
  82         struct notifier_block   cpufreq_nb;
  83 #endif
  84         struct timer_list       poll_timer;
  85         struct list_head        node;
  86         void *driver_data;
  87 };
  88
  89 struct skt_dev_info {
  90         int nskt;
  91         struct soc_pcmcia_socket skt[];
  92 };
  93
  94 struct pcmcia_state {
  95   unsigned detect: 1,
  96             ready: 1,
  97              bvd1: 1,
  98              bvd2: 1,
  99            wrprot: 1,
 100             vs_3v: 1,
 101             vs_Xv: 1;
 102 };
 103
 104 struct pcmcia_low_level {
 105         struct module *owner;
 106
 107         /* first socket in system */
 108         int first;
 109         /* nr of sockets */
 110         int nr;
 111
 112         int (*hw_init)(struct soc_pcmcia_socket *);
 113         void (*hw_shutdown)(struct soc_pcmcia_socket *);
 114
 115         void (*socket_state)(struct soc_pcmcia_socket *, struct pcmcia_state *);
 116         int (*configure_socket)(struct soc_pcmcia_socket *, const socket_state_t *);
 117
 118         /*
 119          * Enable card status IRQs on (re-)initialisation.  This can
 120          * be called at initialisation, power management event, or
 121          * pcmcia event.
 122          */
 123         void (*socket_init)(struct soc_pcmcia_socket *);
 124
 125         /*
 126          * Disable card status IRQs and PCMCIA bus on suspend.
 127          */
 128         void (*socket_suspend)(struct soc_pcmcia_socket *);
 129
 130         /*
 131          * Hardware specific timing routines.
 132          * If provided, the get_timing routine overrides the SOC default.
 133          */
 134         unsigned int (*get_timing)(struct soc_pcmcia_socket *, unsigned int, unsigned int);
 135         int (*set_timing)(struct soc_pcmcia_socket *);
 136         int (*show_timing)(struct soc_pcmcia_socket *, char *);
 137
 138 #ifdef CONFIG_CPU_FREQ
 139         /*
 140          * CPUFREQ support.
 141          */
 142         int (*frequency_change)(struct soc_pcmcia_socket *, unsigned long, struct cpufreq_freqs *);
 143 #endif
 144 };
 145
 146
 147 struct soc_pcmcia_timing {
 148         unsigned short io;
 149         unsigned short mem;
 150         unsigned short attr;
 151 };
 152
 153 extern void soc_common_pcmcia_get_timing(struct soc_pcmcia_socket *, struct soc_pcmcia_timing *);
 154
 155 void soc_pcmcia_init_one(struct soc_pcmcia_socket *skt,
 156         const struct pcmcia_low_level *ops, struct device *dev);
 157 void soc_pcmcia_remove_one(struct soc_pcmcia_socket *skt);
 158 int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt);
 159 int soc_pcmcia_request_gpiods(struct soc_pcmcia_socket *skt);
 160
 161 void soc_common_cf_socket_state(struct soc_pcmcia_socket *skt,
 162         struct pcmcia_state *state);
 163
 164 int soc_pcmcia_regulator_set(struct soc_pcmcia_socket *skt,
 165         struct soc_pcmcia_regulator *r, int v);
 166
 167 #ifdef CONFIG_PCMCIA_DEBUG
 168
 169 extern void soc_pcmcia_debug(struct soc_pcmcia_socket *skt, const char *func,
 170                              int lvl, const char *fmt, ...);
 171
 172 #define debug(skt, lvl, fmt, arg...) \
 173         soc_pcmcia_debug(skt, __func__, lvl, fmt , ## arg)
 174
 175 #else
 176 #define debug(skt, lvl, fmt, arg...) do { } while (0)
 177 #endif
 178
 179
 180 /*
 181  * The PC Card Standard, Release 7, section 4.13.4, says that twIORD
 182  * has a minimum value of 165ns. Section 4.13.5 says that twIOWR has
 183  * a minimum value of 165ns, as well. Section 4.7.2 (describing
 184  * common and attribute memory write timing) says that twWE has a
 185  * minimum value of 150ns for a 250ns cycle time (for 5V operation;
 186  * see section 4.7.4), or 300ns for a 600ns cycle time (for 3.3V
 187  * operation, also section 4.7.4). Section 4.7.3 says that taOE
 188  * has a maximum value of 150ns for a 300ns cycle time (for 5V
 189  * operation), or 300ns for a 600ns cycle time (for 3.3V operation).
 190  *
 191  * When configuring memory maps, Card Services appears to adopt the policy
 192  * that a memory access time of "0" means "use the default." The default
 193  * PCMCIA I/O command width time is 165ns. The default PCMCIA 5V attribute
 194  * and memory command width time is 150ns; the PCMCIA 3.3V attribute and
 195  * memory command width time is 300ns.
 196  */
 197 #define SOC_PCMCIA_IO_ACCESS            (165)
 198 #define SOC_PCMCIA_5V_MEM_ACCESS        (150)
 199 #define SOC_PCMCIA_3V_MEM_ACCESS        (300)
 200 #define SOC_PCMCIA_ATTR_MEM_ACCESS      (300)
 201
 202 /*
 203  * The socket driver actually works nicely in interrupt-driven form,
 204  * so the (relatively infrequent) polling is "just to be sure."
 205  */
 206 #define SOC_PCMCIA_POLL_PERIOD    (2*HZ)
 207
 208
 209 /* I/O pins replacing memory pins
 210  * (PCMCIA System Architecture, 2nd ed., by Don Anderson, p.75)
 211  *
 212  * These signals change meaning when going from memory-only to
 213  * memory-or-I/O interface:
 214  */
 215 #define iostschg bvd1
 216 #define iospkr   bvd2
 217
 218 #endif