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pcmcia: remove AT91RM9200 Compact Flash driver

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As noted by Arnd Bergmann, "we used to have three drivers for the same
hardware (pcmcia, pata and ide), and only the pcmcia driver remained
in the tree after drivers/ide/ was removed and pata_at91 did not get
converted to DT". "There is no dts file in tree that actually declares
either of them, so chances are that nobody is actually using the CF
slot on at91 any more."[1]

On this rationale, remove the AT91RM9200 Compact Flash driver, which
also assists in reaching "the goal of stopping exporting OF-specific
APIs of gpiolib".[2]

[1] https://lore.kernel.org/lkml/68c63077-848b-45f5-8aca-ed995391f2b6@www.fastmail.com/
[2] https://lore.kernel.org/lkml/Yy6d7TjqzUwGQnQa@penguin/

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski 2022-09-24 16:10:30 +02:00
parent 50f9926da3
commit 15e74c6c1c
3 changed files with 0 additions and 417 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/pcmcia/Kconfig
View File

@ -248,15 +248,6 @@ config OMAP_CF
Say Y here to support the CompactFlash controller on OMAP.
Note that this doesn't support "True IDE" mode.
config AT91_CF
tristate "AT91 CompactFlash Controller"
depends on PCI
depends on OF
depends on PCMCIA && ARCH_AT91
help
Say Y here to support the CompactFlash controller on AT91 chips.
Or choose M to compile the driver as a module named "at91_cf".
config ELECTRA_CF
tristate "Electra CompactFlash Controller"
depends on PCMCIA && PPC_PASEMI

1
drivers/pcmcia/Makefile
View File

@ -30,7 +30,6 @@ obj-$(CONFIG_PCMCIA_SA1100) += sa1100_cs.o
obj-$(CONFIG_PCMCIA_SA1111) += sa1111_cs.o
obj-$(CONFIG_PCMCIA_BCM63XX) += bcm63xx_pcmcia.o
obj-$(CONFIG_OMAP_CF) += omap_cf.o
obj-$(CONFIG_AT91_CF) += at91_cf.o
obj-$(CONFIG_ELECTRA_CF) += electra_cf.o
obj-$(CONFIG_PCMCIA_ALCHEMY_DEVBOARD) += db1xxx_ss.o
obj-$(CONFIG_PCMCIA_MAX1600) += max1600.o

407
drivers/pcmcia/at91_cf.c
View File

@ -1,407 +0,0 @@
// 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/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/pci.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 at91_cf_data {
int irq_pin; /* I/O IRQ */
int det_pin; /* Card detect */
int vcc_pin; /* power switching */
int rst_pin; /* card reset */
u8 chipselect; /* EBI Chip Select number */
u8 flags;
#define AT91_CF_TRUE_IDE 0x01
#define AT91_IDE_SWAP_A0_A2 0x02
};
static 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,
};
/*--------------------------------------------------------------------------*/
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_probe(struct platform_device *pdev)
{
struct at91_cf_socket *cf;
struct at91_cf_data *board;
struct resource *io;
struct resource realio;
int status;
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);
mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc");
if (IS_ERR(mc))
return PTR_ERR(mc);
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;
realio.start = cf->socket.io_offset;
realio.end = realio.start + SZ_64K - 1;
status = pci_remap_iospace(&realio, 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 = 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");