linux/drivers/pcmcia/at91_cf.c
Thomas Gleixner 2874c5fd28 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:32 -07:00

416 lines
10 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* at91_cf.c -- AT91 CompactFlash controller driver
*
* Copyright (C) 2005 David Brownell
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/platform_data/atmel.h>
#include <linux/io.h>
#include <linux/sizes.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/atmel-mc.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/regmap.h>
#include <pcmcia/ss.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.
* Note: These are offsets from the physical base address.
*/
#define CF_ATTR_PHYS (0)
#define CF_IO_PHYS (1 << 23)
#define CF_MEM_PHYS (0x017ff800)
struct regmap *mc;
/*--------------------------------------------------------------------------*/
struct at91_cf_socket {
struct pcmcia_socket socket;
unsigned present:1;
struct platform_device *pdev;
struct at91_cf_data *board;
unsigned long phys_baseaddr;
};
static inline int at91_cf_present(struct at91_cf_socket *cf)
{
return !gpio_get_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 == gpio_to_irq(cf->board->det_pin)) {
unsigned present = at91_cf_present(cf);
/* kick pccard as needed */
if (present != cf->present) {
cf->present = present;
dev_dbg(&cf->pdev->dev, "card %s\n",
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 = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
int vcc = gpio_is_valid(cf->board->vcc_pin);
*sp = SS_DETECT | SS_3VCARD;
if (!rdy || gpio_get_value(cf->board->irq_pin))
*sp |= SS_READY;
if (!vcc || gpio_get_value(cf->board->vcc_pin))
*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 (gpio_is_valid(cf->board->vcc_pin)) {
switch (s->Vcc) {
case 0:
gpio_set_value(cf->board->vcc_pin, 0);
break;
case 33:
gpio_set_value(cf->board->vcc_pin, 1);
break;
default:
return -EINVAL;
}
}
/* toggle reset if needed */
gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n",
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.
*
* 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_MC_SMC_DBW_8;
dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
} else {
csr = AT91_MC_SMC_DBW_16;
dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
}
regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect),
AT91_MC_SMC_DBW, 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->phys_baseaddr + CF_ATTR_PHYS;
else
map->static_start = cf->phys_baseaddr + 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,
};
/*--------------------------------------------------------------------------*/
#if defined(CONFIG_OF)
static const struct of_device_id at91_cf_dt_ids[] = {
{ .compatible = "atmel,at91rm9200-cf" },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);
static int at91_cf_dt_init(struct platform_device *pdev)
{
struct at91_cf_data *board;
board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
if (!board)
return -ENOMEM;
board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);
pdev->dev.platform_data = board;
mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc");
return PTR_ERR_OR_ZERO(mc);
}
#else
static int at91_cf_dt_init(struct platform_device *pdev)
{
return -ENODEV;
}
#endif
static int at91_cf_probe(struct platform_device *pdev)
{
struct at91_cf_socket *cf;
struct at91_cf_data *board = pdev->dev.platform_data;
struct resource *io;
int status;
if (!board) {
status = at91_cf_dt_init(pdev);
if (status)
return status;
board = pdev->dev.platform_data;
}
if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
return -ENODEV;
io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!io)
return -ENODEV;
cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
if (!cf)
return -ENOMEM;
cf->board = board;
cf->pdev = pdev;
cf->phys_baseaddr = io->start;
platform_set_drvdata(pdev, cf);
/* must be a GPIO; ergo must trigger on both edges */
status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
if (status < 0)
return status;
status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
at91_cf_irq, 0, "at91_cf detect", cf);
if (status < 0)
return status;
device_init_wakeup(&pdev->dev, 1);
status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
if (status < 0)
goto fail0a;
if (gpio_is_valid(board->vcc_pin)) {
status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
if (status < 0)
goto fail0a;
}
/*
* 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 (gpio_is_valid(board->irq_pin)) {
status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
if (status < 0)
goto fail0a;
status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
if (status < 0)
goto fail0a;
cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
} else
cf->socket.pci_irq = nr_irqs + 1;
/*
* pcmcia layer only remaps "real" memory not iospace
* io_offset is set to 0x10000 to avoid the check in static_find_io().
* */
cf->socket.io_offset = 0x10000;
status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS);
if (status)
goto fail0a;
/* reserve chip-select regions */
if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
status = -ENXIO;
goto fail0a;
}
dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
cf->socket.owner = THIS_MODULE;
cf->socket.dev.parent = &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 fail0a;
return 0;
fail0a:
device_init_wakeup(&pdev->dev, 0);
return status;
}
static int at91_cf_remove(struct platform_device *pdev)
{
struct at91_cf_socket *cf = platform_get_drvdata(pdev);
pcmcia_unregister_socket(&cf->socket);
device_init_wakeup(&pdev->dev, 0);
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;
if (device_may_wakeup(&pdev->dev)) {
enable_irq_wake(gpio_to_irq(board->det_pin));
if (gpio_is_valid(board->irq_pin))
enable_irq_wake(gpio_to_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 (device_may_wakeup(&pdev->dev)) {
disable_irq_wake(gpio_to_irq(board->det_pin));
if (gpio_is_valid(board->irq_pin))
disable_irq_wake(gpio_to_irq(board->irq_pin));
}
return 0;
}
#else
#define at91_cf_suspend NULL
#define at91_cf_resume NULL
#endif
static struct platform_driver at91_cf_driver = {
.driver = {
.name = "at91_cf",
.of_match_table = of_match_ptr(at91_cf_dt_ids),
},
.probe = at91_cf_probe,
.remove = at91_cf_remove,
.suspend = at91_cf_suspend,
.resume = at91_cf_resume,
};
module_platform_driver(at91_cf_driver);
MODULE_DESCRIPTION("AT91 Compact Flash Driver");
MODULE_AUTHOR("David Brownell");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:at91_cf");