linux-stable/drivers/pcmcia/at91_cf.c
Jeff Garzik c7bec5aba5 Various drivers' irq handlers: kill dead code, needless casts
- Eliminate casts to/from void*

- Eliminate checks for conditions that never occur.  These typically
  fall into two classes:

	1) Checking for 'dev_id == NULL', then it is never called with
	NULL as an argument.

	2) Checking for invalid irq number, when the only caller (the
	system) guarantees the irq handler is called with the proper
	'irq' number argument.

Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-10-06 15:00:58 -04:00

419 lines
10 KiB
C

/*
* 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>
/*
* 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 at91_cf_socket *cf = _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: CF is always 3VCARD */
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 platform_device *pdev)
{
struct at91_cf_socket *cf;
struct at91_cf_data *board = pdev->dev.platform_data;
struct resource *io;
unsigned int csa;
int status;
if (!board || !board->det_pin || !board->rst_pin)
return -ENODEV;
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!io)
return -ENODEV;
cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
if (!cf)
return -ENOMEM;
cf->board = board;
cf->pdev = pdev;
platform_set_drvdata(pdev, 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,
IRQF_SAMPLE_RANDOM, driver_name, cf);
if (status < 0)
goto fail0;
device_init_wakeup(&pdev->dev, 1);
/*
* 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,
IRQF_SHARED, 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(io->start, io->end + 1 - io->start,
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 = &pdev->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].res = io;
status = pcmcia_register_socket(&cf->socket);
if (status < 0)
goto fail2;
return 0;
fail2:
iounmap((void __iomem *) cf->socket.io_offset);
release_mem_region(io->start, io->end + 1 - io->start);
fail1:
if (board->irq_pin)
free_irq(board->irq_pin, cf);
fail0a:
free_irq(board->det_pin, cf);
device_init_wakeup(&pdev->dev, 0);
fail0:
at91_sys_write(AT91_EBI_CSA, csa);
kfree(cf);
return status;
}
static int __exit at91_cf_remove(struct platform_device *pdev)
{
struct at91_cf_socket *cf = platform_get_drvdata(pdev);
struct at91_cf_data *board = cf->board;
struct resource *io = cf->socket.io[0].res;
unsigned int csa;
pcmcia_unregister_socket(&cf->socket);
if (board->irq_pin)
free_irq(board->irq_pin, cf);
free_irq(board->det_pin, cf);
device_init_wakeup(&pdev->dev, 0);
iounmap((void __iomem *) cf->socket.io_offset);
release_mem_region(io->start, io->end + 1 - io->start);
csa = at91_sys_read(AT91_EBI_CSA);
at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
kfree(cf);
return 0;
}
#ifdef CONFIG_PM
static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
{
struct at91_cf_socket *cf = platform_get_drvdata(pdev);
struct at91_cf_data *board = cf->board;
pcmcia_socket_dev_suspend(&pdev->dev, mesg);
if (device_may_wakeup(&pdev->dev))
enable_irq_wake(board->det_pin);
else {
disable_irq_wake(board->det_pin);
disable_irq(board->det_pin);
}
if (board->irq_pin)
disable_irq(board->irq_pin);
return 0;
}
static int at91_cf_resume(struct platform_device *pdev)
{
struct at91_cf_socket *cf = platform_get_drvdata(pdev);
struct at91_cf_data *board = cf->board;
if (board->irq_pin)
enable_irq(board->irq_pin);
if (!device_may_wakeup(&pdev->dev))
enable_irq(board->det_pin);
pcmcia_socket_dev_resume(&pdev->dev);
return 0;
}
#else
#define at91_cf_suspend NULL
#define at91_cf_resume NULL
#endif
static struct platform_driver at91_cf_driver = {
.driver = {
.name = (char *) driver_name,
.owner = THIS_MODULE,
},
.probe = at91_cf_probe,
.remove = __exit_p(at91_cf_remove),
.suspend = at91_cf_suspend,
.resume = at91_cf_resume,
};
/*--------------------------------------------------------------------------*/
static int __init at91_cf_init(void)
{
return platform_driver_register(&at91_cf_driver);
}
module_init(at91_cf_init);
static void __exit at91_cf_exit(void)
{
platform_driver_unregister(&at91_cf_driver);
}
module_exit(at91_cf_exit);
MODULE_DESCRIPTION("AT91 Compact Flash Driver");
MODULE_AUTHOR("David Brownell");
MODULE_LICENSE("GPL");