alistair23-linux/drivers/pcmcia/soc_common.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * linux/drivers/pcmcia/soc_common.h
 *
 * Copyright (C) 2000 John G Dorsey <john+@cs.cmu.edu>
 *
 * This file contains definitions for the PCMCIA support code common to
 * integrated SOCs like the SA-11x0 and PXA2xx microprocessors.
 */
#ifndef _ASM_ARCH_PCMCIA
#define _ASM_ARCH_PCMCIA

/* include the world */
#include <linux/clk.h>
#include <linux/cpufreq.h>
#include <pcmcia/ss.h>
#include <pcmcia/cistpl.h>


struct device;
struct gpio_desc;
struct pcmcia_low_level;
struct regulator;

struct soc_pcmcia_regulator {
	struct regulator	*reg;
	bool			on;
};

/*
 * This structure encapsulates per-socket state which we might need to
 * use when responding to a Card Services query of some kind.
 */
struct soc_pcmcia_socket {
	struct pcmcia_socket	socket;

	/*
	 * Info from low level handler
	 */
	unsigned int		nr;
	struct clk		*clk;

	/*
	 * Core PCMCIA state
	 */
	const struct pcmcia_low_level *ops;

	unsigned int		status;
	socket_state_t		cs_state;

	unsigned short		spd_io[MAX_IO_WIN];
	unsigned short		spd_mem[MAX_WIN];
	unsigned short		spd_attr[MAX_WIN];

	struct resource		res_skt;
	struct resource		res_io;
	struct resource		res_mem;
	struct resource		res_attr;
	void __iomem		*virt_io;

	struct {
		int		gpio;
		struct gpio_desc *desc;
		unsigned int	irq;
		const char	*name;
	} stat[6];
#define SOC_STAT_CD		0	/* Card detect */
#define SOC_STAT_BVD1		1	/* BATDEAD / IOSTSCHG */
#define SOC_STAT_BVD2		2	/* BATWARN / IOSPKR */
#define SOC_STAT_RDY		3	/* Ready / Interrupt */
#define SOC_STAT_VS1		4	/* Voltage sense 1 */
#define SOC_STAT_VS2		5	/* Voltage sense 2 */

	struct gpio_desc	*gpio_reset;
	struct gpio_desc	*gpio_bus_enable;
	struct soc_pcmcia_regulator vcc;
	struct soc_pcmcia_regulator vpp;

	unsigned int		irq_state;

#ifdef CONFIG_CPU_FREQ
	struct notifier_block	cpufreq_nb;
#endif
	struct timer_list	poll_timer;
	struct list_head	node;
	void *driver_data;
};

struct skt_dev_info {
	int nskt;
	struct soc_pcmcia_socket skt[0];
};

struct pcmcia_state {
  unsigned detect: 1,
            ready: 1,
             bvd1: 1,
             bvd2: 1,
           wrprot: 1,
            vs_3v: 1,
            vs_Xv: 1;
};

struct pcmcia_low_level {
	struct module *owner;

	/* first socket in system */
	int first;
	/* nr of sockets */
	int nr;

	int (*hw_init)(struct soc_pcmcia_socket *);
	void (*hw_shutdown)(struct soc_pcmcia_socket *);

	void (*socket_state)(struct soc_pcmcia_socket *, struct pcmcia_state *);
	int (*configure_socket)(struct soc_pcmcia_socket *, const socket_state_t *);

	/*
	 * Enable card status IRQs on (re-)initialisation.  This can
	 * be called at initialisation, power management event, or
	 * pcmcia event.
	 */
	void (*socket_init)(struct soc_pcmcia_socket *);

	/*
	 * Disable card status IRQs and PCMCIA bus on suspend.
	 */
	void (*socket_suspend)(struct soc_pcmcia_socket *);

	/*
	 * Hardware specific timing routines.
	 * If provided, the get_timing routine overrides the SOC default.
	 */
	unsigned int (*get_timing)(struct soc_pcmcia_socket *, unsigned int, unsigned int);
	int (*set_timing)(struct soc_pcmcia_socket *);
	int (*show_timing)(struct soc_pcmcia_socket *, char *);

#ifdef CONFIG_CPU_FREQ
	/*
	 * CPUFREQ support.
	 */
	int (*frequency_change)(struct soc_pcmcia_socket *, unsigned long, struct cpufreq_freqs *);
#endif
};


struct soc_pcmcia_timing {
	unsigned short io;
	unsigned short mem;
	unsigned short attr;
};

extern void soc_common_pcmcia_get_timing(struct soc_pcmcia_socket *, struct soc_pcmcia_timing *);

void soc_pcmcia_init_one(struct soc_pcmcia_socket *skt,
	const struct pcmcia_low_level *ops, struct device *dev);
void soc_pcmcia_remove_one(struct soc_pcmcia_socket *skt);
int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt);
int soc_pcmcia_request_gpiods(struct soc_pcmcia_socket *skt);

void soc_common_cf_socket_state(struct soc_pcmcia_socket *skt,
	struct pcmcia_state *state);

int soc_pcmcia_regulator_set(struct soc_pcmcia_socket *skt,
	struct soc_pcmcia_regulator *r, int v);

#ifdef CONFIG_PCMCIA_DEBUG

extern void soc_pcmcia_debug(struct soc_pcmcia_socket *skt, const char *func,
			     int lvl, const char *fmt, ...);

#define debug(skt, lvl, fmt, arg...) \
	soc_pcmcia_debug(skt, __func__, lvl, fmt , ## arg)

#else
#define debug(skt, lvl, fmt, arg...) do { } while (0)
#endif


/*
 * The PC Card Standard, Release 7, section 4.13.4, says that twIORD
 * has a minimum value of 165ns. Section 4.13.5 says that twIOWR has
 * a minimum value of 165ns, as well. Section 4.7.2 (describing
 * common and attribute memory write timing) says that twWE has a
 * minimum value of 150ns for a 250ns cycle time (for 5V operation;
 * see section 4.7.4), or 300ns for a 600ns cycle time (for 3.3V
 * operation, also section 4.7.4). Section 4.7.3 says that taOE
 * has a maximum value of 150ns for a 300ns cycle time (for 5V
 * operation), or 300ns for a 600ns cycle time (for 3.3V operation).
 *
 * When configuring memory maps, Card Services appears to adopt the policy
 * that a memory access time of "0" means "use the default." The default
 * PCMCIA I/O command width time is 165ns. The default PCMCIA 5V attribute
 * and memory command width time is 150ns; the PCMCIA 3.3V attribute and
 * memory command width time is 300ns.
 */
#define SOC_PCMCIA_IO_ACCESS		(165)
#define SOC_PCMCIA_5V_MEM_ACCESS	(150)
#define SOC_PCMCIA_3V_MEM_ACCESS	(300)
#define SOC_PCMCIA_ATTR_MEM_ACCESS	(300)

/*
 * The socket driver actually works nicely in interrupt-driven form,
 * so the (relatively infrequent) polling is "just to be sure."
 */
#define SOC_PCMCIA_POLL_PERIOD    (2*HZ)


/* I/O pins replacing memory pins
 * (PCMCIA System Architecture, 2nd ed., by Don Anderson, p.75)
 *
 * These signals change meaning when going from memory-only to
 * memory-or-I/O interface:
 */
#define iostschg bvd1
#define iospkr   bvd2

#endif