+++ /dev/null
-// 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");
projects / platform / kernel / linux-rpi.git / commitdiff