hd64465_ss.c

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/*
 * $Id$
 *
 * Device driver for the PCMCIA controller module of the
 * Hitachi HD64465 handheld companion chip.
 *
 * Note that the HD64465 provides a very thin PCMCIA host bridge
 * layer, requiring a lot of the work of supporting cards to be
 * performed by the processor.  For example: mapping of card
 * interrupts to processor IRQs is done by IRQ demuxing software;
 * IO and memory mappings are fixed; setting voltages according
 * to card Voltage Select pins etc is done in software.
 *
 * Note also that this driver uses only the simple, fixed,
 * 16MB, 16-bit wide mappings to PCMCIA spaces defined by the
 * HD64465.  Larger mappings, smaller mappings, or mappings of
 * different width to the same socket, are all possible only by
 * involving the SH7750's MMU, which is considered unnecessary here.
 * The downside is that it may be possible for some drivers to
 * break because they need or expect 8-bit mappings.
 *
 * This driver currently supports only the following configuration:
 * SH7750 CPU, HD64465, TPS2206 voltage control chip.
 *
 * by Greg Banks <[e-mail]>
 * (c) 2000 PocketPenguins Inc
 *
 */

#include <linux/types.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <asm/errno.h>
#include <linux/irq.h>

#include <asm/io.h>
#include <asm/hd64465.h>

#include <pcmcia/version.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#include <pcmcia/ss.h>
#include <pcmcia/bulkmem.h>
#include <pcmcia/cistpl.h>
#include "cs_internal.h"

#define MODNAME "hd64465_ss"

/* #define HD64465_DEBUG 1 */

#ifndef HD64465_DEBUG
#define HD64465_DEBUG 0
#endif

#if HD64465_DEBUG
#define DPRINTK(args...)	printk(MODNAME ": " args)
#else
#define DPRINTK(args...)
#endif

extern int hd64465_io_debug;


/*============================================================*/

#define HS_IO_MAP_SIZE 	(64*1024)

typedef struct hs_socket_t
{
    u_int   	    	irq;
    u_long  	    	mem_base;
    u_long  	    	mem_length;
    void	    	(*handler)(void *info, u_int events);
    void    	    	*handler_info;
    u_int   	    	pending_events;
    u_int   	    	ctrl_base;
    socket_state_t  	state;
    pccard_io_map     	io_maps[MAX_IO_WIN];
    pccard_mem_map  	mem_maps[MAX_WIN];
    struct vm_struct	*io_vma;    /* allocated kernel vm for mapping IO space */
} hs_socket_t;

#define HS_MAX_SOCKETS 2
static hs_socket_t hs_sockets[HS_MAX_SOCKETS];
static spinlock_t hs_pending_event_lock = SPIN_LOCK_UNLOCKED;

/* Calculate socket number from ptr into hs_sockets[] */
#define hs_sockno(sp) 	(sp - hs_sockets)

static socket_cap_t hs_socket_cap =
{
    SS_CAP_PCCARD   	    /* support 16 bit cards */
    |SS_CAP_STATIC_MAP      /* mappings are fixed in host memory */
    ,
    0xffde/*0xffff*/, 	    /* IRQs mapped in s/w so can do any, really */
    HD64465_PCC_WINDOW,     /* 16MB fixed window size */
    0,	    	    	    /* no PCI support */
    0,	    	    	    /* no CardBus support */
    0	    	    	    /* no bus operations needed */
};

#define hs_in(sp, r)	    inb((sp)->ctrl_base + (r))
#define hs_out(sp, v, r)    outb(v, (sp)->ctrl_base + (r))


/* translate a boolean value to a bit in a register */
#define bool_to_regbit(sp, r, bi, bo)	    	\
    do {    	    	    	    	    	\
    	unsigned short v = hs_in(sp, r);    	\
	if (bo)     	    	    	    	\
	    v |= (bi);	    	    	    	\
	else	    	    	    	    	\
	    v &= ~(bi);     	    	    	\
	hs_out(sp, v, r);   	    	    	\
    } while(0)
    
/* register offsets from HD64465_REG_PCC[01]ISR */
#define ISR 	0x0
#define GCR 	0x2
#define CSCR 	0x4
#define CSCIER 	0x6
#define SCR 	0x8


/* Mask and values for CSCIER register */
#define IER_MASK    0x80
#define IER_ON	    0x3f    	/* interrupts on */
#define IER_OFF     0x00    	/* interrupts off */

/*============================================================*/

#if HD64465_DEBUG > 10

static void cis_hex_dump(const unsigned char *x, int len)
{
    	int i;
	
    	for (i=0 ; i<len ; i++)
	{
	    if (!(i & 0xf))
	    	printk("\n%08x", (unsigned)(x + i));
	    printk(" %02x", *(volatile unsigned short*)x);
	    x += 2;
	}
	printk("\n");
}

#endif
/*============================================================*/

/*
 * This code helps create the illusion that the IREQ line from
 * the PC card is mapped to one of the CPU's IRQ lines by the
 * host bridge hardware (which is how every host bridge *except*
 * the HD64465 works).  In particular, it supports enabling
 * and disabling the IREQ line by code which knows nothing
 * about the host bridge (e.g. device drivers, IDE code) using
 * the request_irq(), free_irq(), probe_irq_on() and probe_irq_off()
 * functions.  Also, it supports sharing the mapped IRQ with
 * real hardware IRQs from the -IRL0-3 lines.
 */

#define HS_NUM_MAPPED_IRQS  16	/* Limitation of the PCMCIA code */
static struct
{
    /* index is mapped irq number */
    hs_socket_t *sock;
    hw_irq_controller *old_handler;
} hs_mapped_irq[HS_NUM_MAPPED_IRQS];

static void hs_socket_enable_ireq(hs_socket_t *sp)
{
    	unsigned short cscier;
	
    	DPRINTK("hs_socket_enable_ireq(sock=%d)\n", hs_sockno(sp));

    	cscier = hs_in(sp, CSCIER);
	cscier &= ~HD64465_PCCCSCIER_PIREQE_MASK;
    	cscier |= HD64465_PCCCSCIER_PIREQE_LEVEL;
	hs_out(sp, cscier, CSCIER);
}

static void hs_socket_disable_ireq(hs_socket_t *sp)
{
    	unsigned short cscier;
	
    	DPRINTK("hs_socket_disable_ireq(sock=%d)\n", hs_sockno(sp));
	
    	cscier = hs_in(sp, CSCIER);
	cscier &= ~HD64465_PCCCSCIER_PIREQE_MASK;
	hs_out(sp, cscier, CSCIER);
}

static unsigned int hs_startup_irq(unsigned int irq)
{
	hs_socket_enable_ireq(hs_mapped_irq[irq].sock);
	hs_mapped_irq[irq].old_handler->startup(irq);
	return 0;
}

static void hs_shutdown_irq(unsigned int irq)
{
	hs_socket_disable_ireq(hs_mapped_irq[irq].sock);
	hs_mapped_irq[irq].old_handler->shutdown(irq);
}

static void hs_enable_irq(unsigned int irq)
{
	hs_socket_enable_ireq(hs_mapped_irq[irq].sock);
	hs_mapped_irq[irq].old_handler->enable(irq);
}

static void hs_disable_irq(unsigned int irq)
{
	hs_socket_disable_ireq(hs_mapped_irq[irq].sock);
	hs_mapped_irq[irq].old_handler->disable(irq);
}

extern struct hw_interrupt_type no_irq_type;

static void hs_mask_and_ack_irq(unsigned int irq)
{
	hs_socket_disable_ireq(hs_mapped_irq[irq].sock);
	/* ack_none() spuriously complains about an unexpected IRQ */
	if (hs_mapped_irq[irq].old_handler != &no_irq_type)
	    hs_mapped_irq[irq].old_handler->ack(irq);
}

static void hs_end_irq(unsigned int irq)
{
	hs_socket_enable_ireq(hs_mapped_irq[irq].sock);
	hs_mapped_irq[irq].old_handler->end(irq);
}


static struct hw_interrupt_type hd64465_ss_irq_type = {
	typename:	"PCMCIA-IRQ",
	startup:	hs_startup_irq,
	shutdown:	hs_shutdown_irq,
	enable:		hs_enable_irq,
	disable:	hs_disable_irq,
	ack:		hs_mask_and_ack_irq,
	end:		hs_end_irq
};

/* 
 * This function should only ever be called with interrupts disabled.
 */
static void hs_map_irq(hs_socket_t *sp, unsigned int irq)
{
    	DPRINTK("hs_map_irq(sock=%d irq=%d)\n", hs_sockno(sp), irq);
	
	if (irq >= HS_NUM_MAPPED_IRQS)
	    return;

    	hs_mapped_irq[irq].sock = sp;
	/* insert ourselves as the irq controller */
	hs_mapped_irq[irq].old_handler = irq_desc[irq].handler;
	irq_desc[irq].handler = &hd64465_ss_irq_type;
}


/* 
 * This function should only ever be called with interrupts disabled.
 */
static void hs_unmap_irq(hs_socket_t *sp, unsigned int irq)
{
    	DPRINTK("hs_unmap_irq(sock=%d irq=%d)\n", hs_sockno(sp), irq);
	
	if (irq >= HS_NUM_MAPPED_IRQS)
	    return;
		
	/* restore the original irq controller */
	irq_desc[irq].handler = hs_mapped_irq[irq].old_handler;
}

/*============================================================*/


/*
 * Set Vpp and Vcc (in tenths of a Volt).  Does not
 * support the hi-Z state.
 *
 * Note, this assumes the board uses a TPS2206 chip to control
 * the Vcc and Vpp voltages to the hs_sockets.  If your board
 * uses the MIC2563 (also supported by the HD64465) then you
 * will have to modify this function.
 */
    	    	    	    	         /* 0V   3.3V  5.5V */
static const u_char hs_tps2206_avcc[3] = { 0x00, 0x04, 0x08 };
static const u_char hs_tps2206_bvcc[3] = { 0x00, 0x80, 0x40 };

static int hs_set_voltages(hs_socket_t *sp, int Vcc, int Vpp)
{
    	u_int psr;
	u_int vcci = 0;
	u_int sock = hs_sockno(sp);
	
    	DPRINTK("hs_set_voltage(%d, %d, %d)\n", sock, Vcc, Vpp);

    	switch (Vcc)
	{
	case 0:  vcci = 0; break;
	case 33: vcci = 1; break;
	case 50: vcci = 2; break;
	default: return 0;
	}

    	/* Note: Vpp = 120 not supported -- Greg Banks */
	if (Vpp != 0 && Vpp != Vcc)
	    return 0;
	
	/* The PSR register holds 8 of the 9 bits which control
	 * the TPS2206 via its serial interface.
	 */
	psr = inw(HD64465_REG_PCCPSR);
	switch (sock)
	{
	case 0:
	    psr &= 0x0f;
	    psr |= hs_tps2206_avcc[vcci];
	    psr |= (Vpp == 0 ? 0x00 : 0x02);
	    break;
	case 1:
	    psr &= 0xf0;
	    psr |= hs_tps2206_bvcc[vcci];
	    psr |= (Vpp == 0 ? 0x00 : 0x20);
	    break;
	};
	outw(psr, HD64465_REG_PCCPSR);
	
	return 1;
}


/*============================================================*/

/*
 * Drive the RESET line to the card.
 */
static void hs_reset_socket(hs_socket_t *sp, int on)
{
    	unsigned short v;
	
	v = hs_in(sp, GCR);
	if (on)
	    v |= HD64465_PCCGCR_PCCR;
	else
	    v &= ~HD64465_PCCGCR_PCCR;
	hs_out(sp, v, GCR);
}

/*============================================================*/

static int hs_init(unsigned int sock)
{
    	hs_socket_t *sp = &hs_sockets[sock];
	
    	DPRINTK("hs_init(%d)\n", sock);
	
	sp->pending_events = 0;
	sp->state.Vcc = 0;
	sp->state.Vpp = 0;
	hs_set_voltages(sp, 0, 0);
	
	return 0;
}

/*============================================================*/

static int hs_suspend(unsigned int sock)
{
    	DPRINTK("hs_suspend(%d)\n", sock);

    	/* TODO */
	
	return 0;
}

/*============================================================*/

static int hs_register_callback(unsigned int sock,
    	    void (*handler)(void *, unsigned int), void * info)
{
    	hs_socket_t *sp = &hs_sockets[sock];
	
    	DPRINTK("hs_register_callback(%d)\n", sock);
	sp->handler = handler;
	sp->handler_info = info;
	if (handler == 0) {
	    MOD_DEC_USE_COUNT;
	} else {
	    MOD_INC_USE_COUNT;
	}
	return 0;
}

/*============================================================*/

static int hs_inquire_socket(unsigned int sock, socket_cap_t *cap)
{
    	DPRINTK("hs_inquire_socket(%d)\n", sock);

	*cap = hs_socket_cap;
	return 0;
}

/*============================================================*/

static int hs_get_status(unsigned int sock, u_int *value)
{
    	hs_socket_t *sp = &hs_sockets[sock];
    	unsigned int isr;
	u_int status = 0;
	
	
	isr = hs_in(sp, ISR);

    	/* Card is seated and powered when *both* CD pins are low */
	if ((isr & HD64465_PCCISR_PCD_MASK) == 0)
    	{
	    status |= SS_DETECT;    /* card present */

	    switch (isr & HD64465_PCCISR_PBVD_MASK)
	    {
	    case HD64465_PCCISR_PBVD_BATGOOD:   
		break;
	    case HD64465_PCCISR_PBVD_BATWARN:
		status |= SS_BATWARN;
		break;
	    default:
		status |= SS_BATDEAD;
		break;
	    }

	    if (isr & HD64465_PCCISR_PREADY)
		status |= SS_READY;

	    if (isr & HD64465_PCCISR_PMWP)
		status |= SS_WRPROT;
		
	    /* Voltage Select pins interpreted as per Table 4-5 of the std.
	     * Assuming we have the TPS2206, the socket is a "Low Voltage
	     * key, 3.3V and 5V available, no X.XV available".
	     */
	    switch (isr & (HD64465_PCCISR_PVS2|HD64465_PCCISR_PVS1))
	    {
	    case HD64465_PCCISR_PVS1:
	    	printk(KERN_NOTICE MODNAME ": cannot handle X.XV card, ignored\n");
		status = 0;
	    	break;
	    case 0:
	    case HD64465_PCCISR_PVS2:
    	    	/* 3.3V */
    	    	status |= SS_3VCARD;
	    	break;
	    case HD64465_PCCISR_PVS2|HD64465_PCCISR_PVS1:
	    	/* 5V */
	    	break;
	    }
		
	    /* TODO: SS_POWERON */
	    /* TODO: SS_STSCHG */
    	}	
	
    	DPRINTK("hs_get_status(%d) = %x\n", sock, status);
	
	*value = status;
	return 0;
}

/*============================================================*/

static int hs_get_socket(unsigned int sock, socket_state_t *state)
{
    	hs_socket_t *sp = &hs_sockets[sock];

    	DPRINTK("hs_get_socket(%d)\n", sock);
	
	*state = sp->state;
	return 0;
}

/*============================================================*/

static int hs_set_socket(unsigned int sock, socket_state_t *state)
{
    	hs_socket_t *sp = &hs_sockets[sock];
    	u_long flags;
	u_int changed;
	unsigned short cscier;

    	DPRINTK("hs_set_socket(sock=%d, flags=%x, csc_mask=%x, Vcc=%d, Vpp=%d, io_irq=%d)\n",
	    sock, state->flags, state->csc_mask, state->Vcc, state->Vpp, state->io_irq);
	
	save_and_cli(flags);	/* Don't want interrupts happening here */

	if (state->Vpp != sp->state.Vpp ||
	    state->Vcc != sp->state.Vcc) {
	    if (!hs_set_voltages(sp, state->Vcc, state->Vpp)) {
	    	restore_flags(flags);
	    	return -EINVAL;
	    }
	}

/*    	hd64465_io_debug = 1; */
    	/*
	 * Handle changes in the Card Status Change mask,
	 * by propagating to the CSCR register
	 */	
	changed = sp->state.csc_mask ^ state->csc_mask;
	cscier = hs_in(sp, CSCIER);
	    
	if (changed & SS_DETECT) {
	    if (state->csc_mask & SS_DETECT)
		cscier |= HD64465_PCCCSCIER_PCDE;
	    else
		cscier &= ~HD64465_PCCCSCIER_PCDE;
	}

	if (changed & SS_READY) {
	    if (state->csc_mask & SS_READY)
		cscier |= HD64465_PCCCSCIER_PRE;
	    else
		cscier &= ~HD64465_PCCCSCIER_PRE;
	}

	if (changed & SS_BATDEAD) {
	    if (state->csc_mask & SS_BATDEAD)
		cscier |= HD64465_PCCCSCIER_PBDE;
	    else
		cscier &= ~HD64465_PCCCSCIER_PBDE;
	}

	if (changed & SS_BATWARN) {
	    if (state->csc_mask & SS_BATWARN)
		cscier |= HD64465_PCCCSCIER_PBWE;
	    else
		cscier &= ~HD64465_PCCCSCIER_PBWE;