diff options
Diffstat (limited to 'drivers/pcmcia/at91_cf.c')
-rw-r--r-- | drivers/pcmcia/at91_cf.c | 418 |
1 files changed, 418 insertions, 0 deletions
diff --git a/drivers/pcmcia/at91_cf.c b/drivers/pcmcia/at91_cf.c new file mode 100644 index 000000000..e7775a41a --- /dev/null +++ b/drivers/pcmcia/at91_cf.c @@ -0,0 +1,418 @@ +/* + * 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/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/of.h> +#include <linux/of_device.h> +#include <linux/of_gpio.h> + +#include <pcmcia/ss.h> + +#include <mach/at91rm9200_mc.h> +#include <mach/at91_ramc.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_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. + */ + csr = at91_ramc_read(0, AT91_SMC_CSR(cf->board->chipselect)) & ~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; + dev_dbg(&cf->pdev->dev, "8bit i/o bus\n"); + } else { + csr |= AT91_SMC_DBW_16; + dev_dbg(&cf->pdev->dev, "16bit i/o bus\n"); + } + at91_ramc_write(0, AT91_SMC_CSR(cf->board->chipselect), 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; + + return 0; +} +#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"); |