/*
* at91_cf.c -- AT91 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/interrupt.h>
#include <pcmcia/ss.h>
#include <asm/hardware.h>
#include <asm/io.h>
#include <asm/sizes.h>
#include <asm/arch/at91rm9200.h>
#include <asm/arch/board.h>
#include <asm/arch/gpio.h>
#define CF_SIZE 0x30000000 /* CS5+CS6: unavailable */
/*
* A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
* some other bit in {A24,A22..A11} is nREG to flag memory access
* (vs attributes). So more than 2KB/region would just be waste.
*/
#define CF_ATTR_PHYS (AT91_CF_BASE)
#define CF_IO_PHYS (AT91_CF_BASE + (1 << 23))
#define CF_MEM_PHYS (AT91_CF_BASE + 0x017ff800)
/*--------------------------------------------------------------------------*/
static const char driver_name[] = "at91_cf";
struct at91_cf_socket {
struct pcmcia_socket socket;
unsigned present:1;
struct platform_device *pdev;
struct at91_cf_data *board;
};
#define SZ_2K (2 * SZ_1K)
static inline int at91_cf_present(struct at91_cf_socket *cf)
{
return !at91_get_gpio_value(cf->board->det_pin);
}
/*--------------------------------------------------------------------------*/
static int at91_cf_ss_init(struct pcmcia_socket *s)
{
return 0;
}
static irqreturn_t at91_cf_irq(int irq, void *_cf, struct pt_regs *r)
{
struct at91_cf_socket *cf = (struct at91_cf_socket *) _cf;
if (irq == cf->board->det_pin) {
unsigned present = at91_cf_present(cf);
/* kick pccard as needed */
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);
}
}
return IRQ_HANDLED;
}
static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
{
struct at91_cf_socket *cf;
if (!sp)
return -EINVAL;
cf = container_of(s, struct at91_cf_socket, socket);
/* NOTE: we assume 3VCARD, not XVCARD... */
if (at91_cf_present(cf)) {
int rdy = cf->board->irq_pin; /* RDY/nIRQ */
int vcc = cf->board->vcc_pin;
*sp = SS_DETECT | SS_3VCARD;
if (!rdy || at91_get_gpio_value(rdy))
*sp |= SS_READY;
if (!vcc || at91_get_gpio_value(vcc))
*sp |= SS_POWERON;
} else
*sp = 0;
return 0;
}
static int at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
{
struct at91_cf_socket *cf;
cf = container_of(sock, struct at91_cf_socket, socket);
/* switch Vcc if needed and possible */
if (cf->board->vcc_pin) {
switch (s->Vcc) {
case 0:
at91_set_gpio_value(cf->board->vcc_pin, 0);
break;
case 33:
at91_set_gpio_value(cf->board->vcc_pin, 1);
break;
default:
return -EINVAL;
}
}
/* toggle reset if needed */
at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET);
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 at91_cf_ss_suspend(struct pcmcia_socket *s)
{
return at91_cf_set_socket(s, &dead_socket);
}
/* we already mapped the I/O region */
static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
{
struct at91_cf_socket *cf;
u32 csr;
cf = container_of(s, struct at91_cf_socket, socket);
io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
/*
* Use 16 bit accesses unless/until we need 8-bit i/o space.
* Always set CSR4 ... PCMCIA won't always unmap things.
*/
csr = at91_sys_read(AT91_SMC_CSR(4)) & ~AT91_SMC_DBW;
/*
* NOTE: this CF controller ignores IOIS16, so we can't really do
* MAP_AUTOSZ. The 16bit mode allows single byte access on either
* D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
* purposes (and handles ide-cs).
*
* The 8bit mode is needed for odd byte access on D0-D7. It seems
* some cards only like that way to get at the odd byte, despite
* CF 3.0 spec table 35 also giving the D8-D15 option.
*/
if (!(io->flags & (MAP_16BIT|MAP_AUTOSZ))) {
csr |= AT91_SMC_DBW_8;
pr_debug("%s: 8bit i/o bus\n", driver_name);
} else {
csr |= AT91_SMC_DBW_16;
pr_debug("%s: 16bit i/o bus\n", driver_name);
}
at91_sys_write(AT91_SMC_CSR(4), csr);
io->start = cf->socket.io_offset;
io->stop = io->start + SZ_2K - 1;
return 0;
}
/* pcmcia layer maps/unmaps mem regions */
static int at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
{
struct at91_cf_socket *cf;
if (map->card_start)
return -EINVAL;
cf = container_of(s, struct at91_cf_socket, socket);
map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
if (map->flags & MAP_ATTRIB)
map->static_start = CF_ATTR_PHYS;
else
map->static_start = CF_MEM_PHYS;
return 0;
}
static struct pccard_operations at91_cf_ops = {
.init = at91_cf_ss_init,
.suspend = at91_cf_ss_suspend,
.get_status = at91_cf_get_status,
.set_socket = at91_cf_set_socket,
.set_io_map = at91_cf_set_io_map,
.set_mem_map = at91_cf_set_mem_map,
};
/*--------------------------------------------------------------------------*/
static int __init at91_cf_probe(struct device *dev)
{
struct at91_cf_socket *cf;
struct at91_cf_data *board = dev->platform_data;
struct platform_device *pdev = to_platform_device(dev);
unsigned int csa;
int status;
if (!board || !board->det_pin || !board->rst_pin)
return -ENODEV;
cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
if (!cf)
return -ENOMEM;
cf->board = board;
cf->pdev = pdev;
dev_set_drvdata(dev, cf);
/* CF takes over CS4, CS5, CS6 */
csa = at91_sys_read(AT91_EBI_CSA);
at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH);
/* force poweron defaults for these pins ... */
(void) at91_set_A_periph(AT91_PIN_PC9, 0); /* A25/CFRNW */
(void) at91_set_A_periph(AT91_PIN_PC10, 0); /* NCS4/CFCS */
(void) at91_set_A_periph(AT91_PIN_PC11, 0); /* NCS5/CFCE1 */
(void) at91_set_A_periph(AT91_PIN_PC12, 0); /* NCS6/CFCE2 */
/* nWAIT is _not_ a default setting */
(void) at91_set_A_periph(AT91_PIN_PC6, 1); /* nWAIT */
/*
* Static memory controller timing adjustments.
* REVISIT: these timings are in terms of MCK cycles, so
* when MCK changes (cpufreq etc) so must these values...
*/
at91_sys_write(AT91_SMC_CSR(4), AT91_SMC_ACSS_STD | AT91_SMC_DBW_16 | AT91_SMC_BAT | AT91_SMC_WSEN
| AT91_SMC_NWS_(32) /* wait states */
| AT91_SMC_RWSETUP_(6) /* setup time */
| AT91_SMC_RWHOLD_(4) /* hold time */
);
/* must be a GPIO; ergo must trigger on both edges */
status = request_irq(board->det_pin, at91_cf_irq,
SA_SAMPLE_RANDOM, driver_name, cf);
if (status < 0)
goto fail0;
/*
* The card driver will request this irq later as needed.
* but it causes lots of "irqNN: nobody cared" messages
* unless we report that we handle everything (sigh).
* (Note: DK board doesn't wire the IRQ pin...)
*/
if (board->irq_pin) {
status = request_irq(board->irq_pin, at91_cf_irq,
SA_SHIRQ, driver_name, cf);
if (status < 0)
goto fail0a;
cf->socket.pci_irq = board->irq_pin;
}
else
cf->socket.pci_irq = NR_IRQS + 1;
/* pcmcia layer only remaps "real" memory not iospace */
cf->socket.io_offset = (unsigned long) ioremap(CF_IO_PHYS, SZ_2K);
if (!cf->socket.io_offset)
goto fail1;
/* reserve CS4, CS5, and CS6 regions; but use just CS4 */
if (!request_mem_region(AT91_CF_BASE, CF_SIZE, driver_name))
goto fail1;
pr_info("%s: irqs det #%d, io #%d\n", driver_name,
board->det_pin, board->irq_pin);
cf->socket.owner = THIS_MODULE;
cf->socket.dev.dev = dev;
cf->socket.ops = &at91_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;
cf->socket.io[0].NumPorts = SZ_2K;
status = pcmcia_register_socket(&cf->socket);
if (status < 0)
goto fail2;
return 0;
fail2:
iounmap((void __iomem *) cf->socket.io_offset);
release_mem_region(AT91_CF_BASE, CF_SIZE);
fail1:
if (board->irq_pin)
free_irq(board->irq_pin, cf);
fail0a:
free_irq(board->det_pin, cf);
fail0:
at91_sys_write(AT91_EBI_CSA, csa);
kfree(cf);
return status;
}
static int __exit at91_cf_remove(struct device *dev)
{
struct at91_cf_socket *cf = dev_get_drvdata(dev);
unsigned int csa;
pcmcia_unregister_socket(&cf->socket);
free_irq(cf->board->irq_pin, cf);
free_irq(cf->board->det_pin, cf);
iounmap((void __iomem *) cf->socket.io_offset);
release_mem_region(AT91_CF_BASE, CF_SIZE);
csa = at91_sys_read(AT91_EBI_CSA);
at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
kfree(cf);
return 0;
}
static struct device_driver at91_cf_driver = {
.name = (char *) driver_name,
.bus = &platform_bus_type,
.probe = at91_cf_probe,
.remove = __exit_p(at91_cf_remove),
.suspend = pcmcia_socket_dev_suspend,
.resume = pcmcia_socket_dev_resume,
};
/*--------------------------------------------------------------------------*/
static int __init at91_cf_init(void)
{
return driver_register(&at91_cf_driver);
}
module_init(at91_cf_init);
static void __exit at91_cf_exit(void)
{
driver_unregister(&at91_cf_driver);
}
module_exit(at91_cf_exit);
MODULE_DESCRIPTION("AT91 Compact Flash Driver");
MODULE_AUTHOR("David Brownell");
MODULE_LICENSE("GPL");
