/*
* omap_cf.c -- OMAP 16xx CompactFlash controller driver
*
* Copyright (c) 2005 David Brownell
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <pcmcia/ss.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <asm/arch/mux.h>
#include <asm/arch/tc.h>
/* NOTE: don't expect this to support many I/O cards. The 16xx chips have
* hard-wired timings to support Compact Flash memory cards; they won't work
* with various other devices (like WLAN adapters) without some external
* logic to help out.
*
* NOTE: CF controller docs disagree with address space docs as to where
* CF_BASE really lives; this is a doc erratum.
*/
#define CF_BASE 0xfffe2800
/* status; read after IRQ */
#define CF_STATUS_REG __REG16(CF_BASE + 0x00)
# define CF_STATUS_BAD_READ (1 << 2)
# define CF_STATUS_BAD_WRITE (1 << 1)
# define CF_STATUS_CARD_DETECT (1 << 0)
/* which chipselect (CS0..CS3) is used for CF (active low) */
#define CF_CFG_REG __REG16(CF_BASE + 0x02)
/* card reset */
#define CF_CONTROL_REG __REG16(CF_BASE + 0x04)
# define CF_CONTROL_RESET (1 << 0)
#define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))
/*--------------------------------------------------------------------------*/
static const char driver_name[] = "omap_cf";
struct omap_cf_socket {
struct pcmcia_socket socket;
struct timer_list timer;
unsigned present:1;
unsigned active:1;
struct platform_device *pdev;
unsigned long phys_cf;
u_int irq;
};
#define POLL_INTERVAL (2 * HZ)
#define SZ_2K (2 * SZ_1K)
/*--------------------------------------------------------------------------*/
static int omap_cf_ss_init(struct pcmcia_socket *s)
{
return 0;
}
/* the timer is primarily to kick this socket's pccardd */
static void omap_cf_timer(unsigned long _cf)
{
struct omap_cf_socket *cf = (void *) _cf;
unsigned present = omap_cf_present();
if (present != cf->present) {
cf->present = present;
pr_debug("%s: card %s\n", driver_name,
present ? "present" : "gone");
pcmcia_parse_events(&cf->socket, SS_DETECT);
}
if (cf->active)
mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
}
/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
* claim the card's IRQ. It may also detect some card insertions, but
* not removals; it can't always eliminate timer irqs.
*/
static irqreturn_t omap_cf_irq(int irq, void *_cf, struct pt_regs *r)
{
omap_cf_timer((unsigned long)_cf);
return IRQ_HANDLED;
}
static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
if (!sp)
return -EINVAL;
/* FIXME power management should probably be board-specific:
* - 3VCARD vs XVCARD (OSK only handles 3VCARD)
* - POWERON (switched on/off by set_socket)
*/
if (omap_cf_present()) {
struct omap_cf_socket *cf;
*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
cf = container_of(s, struct omap_cf_socket, socket);
s->irq.AssignedIRQ = cf->irq;
} else
*sp = 0;
return 0;
}
static int
omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
{
u16 control;
/* FIXME some non-OSK boards will support power switching */
switch (s->Vcc) {
case 0:
case 33:
break;
default:
return -EINVAL;
}
control = CF_CONTROL_REG;
if (s->flags & SS_RESET)
CF_CONTROL_REG = CF_CONTROL_RESET;
else
CF_CONTROL_REG = 0;
pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
return 0;
}
static int omap_cf_ss_suspend(struct pcmcia_socket *s)
{
pr_debug("%s: %s\n", driver_name, __FUNCTION__);
return omap_cf_set_socket(s, &dead_socket);
}
/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
static int
omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
{
struct omap_cf_socket *cf;
cf = container_of(s, struct omap_cf_socket, socket);
io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
io->start = cf->phys_cf + SZ_4K;
io->stop = io->start + SZ_2K - 1;
return 0;
}
static int
omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
{
struct omap_cf_socket *cf;
if (map->card_start)
return -EINVAL;
cf = container_of(s, struct omap_cf_socket, socket);
map->static_start = cf->phys_cf;
map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
if (map->flags & MAP_ATTRIB)
map->static_start += SZ_2K;
return 0;
}
static struct pccard_operations omap_cf_ops = {
.init = omap_cf_ss_init,
.suspend = omap_cf_ss_suspend,
.get_status = omap_cf_get_status,
.set_socket = omap_cf_set_socket,
.set_io_map = omap_cf_set_io_map,
.set_mem_map = omap_cf_set_mem_map,
};
/*--------------------------------------------------------------------------*/
/*
* NOTE: right now the only board-specific platform_data is
* "what chipselect is used". Boards could want more.
*/
static int __init omap_cf_probe(struct device *dev)
{
unsigned seg;
struct omap_cf_socket *cf;
struct platform_device *pdev = to_platform_device(dev);
int irq;
int status;
seg = (int) dev->platform_data;
if (seg == 0 || seg > 3)
return -ENODEV;
/* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return -EINVAL;
cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
if (!cf)
return -ENOMEM;
init_timer(&cf->timer);
cf->timer.function = omap_cf_timer;
cf->timer.data = (unsigned long) cf;
cf->pdev = pdev;
dev_set_drvdata(dev, cf);
/* this primarily just shuts up irq handling noise */
status = request_irq(irq, omap_cf_irq, SA_SHIRQ,
driver_name, cf);
if (status < 0)
goto fail0;
cf->irq = irq;
cf->socket.pci_irq = irq;
switch (seg) {
/* NOTE: CS0 could be configured too ... */
case 1:
cf->phys_cf = OMAP_CS1_PHYS;
break;
case 2:
cf->phys_cf = OMAP_CS2_PHYS;
break;
case 3:
cf->phys_cf = omap_cs3_phys();
break;
default:
goto fail1;
}
/* pcmcia layer only remaps "real" memory */
cf->socket.io_offset = (unsigned long)
ioremap(cf->phys_cf + SZ_4K, SZ_2K);
if (!cf->socket.io_offset)
goto fail1;
if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
goto fail1;
/* NOTE: CF conflicts with MMC1 */
omap_cfg_reg(W11_1610_CF_CD1);
omap_cfg_reg(P11_1610_CF_CD2);
omap_cfg_reg(R11_1610_CF_IOIS16);
omap_cfg_reg(V10_1610_CF_IREQ);
omap_cfg_reg(W10_1610_CF_RESET);
CF_CFG_REG = ~(1 << seg);
pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
/* NOTE: better EMIFS setup might support more cards; but the
* TRM only shows how to affect regular flash signals, not their
* CF/PCMCIA variants...
*/
pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
seg, EMIFS_CCS(seg), EMIFS_ACS(seg));
EMIFS_CCS(seg) = 0x0004a1b3; /* synch mode 4 etc */
EMIFS_ACS(seg) = 0x00000000; /* OE hold/setup */
/* CF uses armxor_ck, which is "always" available */
pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
omap_cf_present() ? "present" : "(not present)");
cf->socket.owner = THIS_MODULE;
cf->socket.dev.dev = dev;
cf->socket.ops = &omap_cf_ops;
cf->socket.resource_ops = &pccard_static_ops;
cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
| SS_CAP_MEM_ALIGN;
cf->socket.map_size = SZ_2K;
status = pcmcia_register_socket(&cf->socket);
if (status < 0)
goto fail2;
cf->active = 1;
mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
return 0;
fail2:
iounmap((void __iomem *) cf->socket.io_offset);
release_mem_region(cf->phys_cf, SZ_8K);
fail1:
free_irq(irq, cf);
fail0:
kfree(cf);
return status;
}
static int __devexit omap_cf_remove(struct device *dev)
{
struct omap_cf_socket *cf = dev_get_drvdata(dev);
cf->active = 0;
pcmcia_unregister_socket(&cf->socket);
del_timer_sync(&cf->timer);
iounmap((void __iomem *) cf->socket.io_offset);
release_mem_region(cf->phys_cf, SZ_8K);
free_irq(cf->irq, cf);
kfree(cf);
return 0;
}
static struct device_driver omap_cf_driver = {
.name = (char *) driver_name,
.bus = &platform_bus_type,
.probe = omap_cf_probe,
.remove = __devexit_p(omap_cf_remove),
.suspend = pcmcia_socket_dev_suspend,
.resume = pcmcia_socket_dev_resume,
};
static int __init omap_cf_init(void)
{
if (cpu_is_omap16xx())
driver_register(&omap_cf_driver);
return 0;
}
static void __exit omap_cf_exit(void)
{
if (cpu_is_omap16xx())
driver_unregister(&omap_cf_driver);
}
module_init(omap_cf_init);
module_exit(omap_cf_exit);
MODULE_DESCRIPTION("OMAP CF Driver");
MODULE_LICENSE("GPL");
