| /* |
| * 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 <pcmcia/ss.h> |
| |
| #include <mach/hardware.h> |
| #include <asm/io.h> |
| #include <asm/sizes.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) |
| |
| /*--------------------------------------------------------------------------*/ |
| |
| 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; |
| |
| 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; |
| 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 = 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); |
| |
| 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. |
| */ |
| 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; |
| 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_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, |
| }; |
| |
| /*--------------------------------------------------------------------------*/ |
| |
| 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; |
| int status; |
| |
| if (!board || !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 = kzalloc(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 = gpio_request(board->det_pin, "cf_det"); |
| if (status < 0) |
| goto fail0; |
| status = request_irq(gpio_to_irq(board->det_pin), at91_cf_irq, 0, driver_name, cf); |
| if (status < 0) |
| goto fail00; |
| device_init_wakeup(&pdev->dev, 1); |
| |
| status = gpio_request(board->rst_pin, "cf_rst"); |
| if (status < 0) |
| goto fail0a; |
| |
| if (gpio_is_valid(board->vcc_pin)) { |
| status = gpio_request(board->vcc_pin, "cf_vcc"); |
| if (status < 0) |
| goto fail0b; |
| } |
| |
| /* |
| * 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 = gpio_request(board->irq_pin, "cf_irq"); |
| if (status < 0) |
| goto fail0c; |
| status = request_irq(gpio_to_irq(board->irq_pin), at91_cf_irq, |
| IRQF_SHARED, driver_name, cf); |
| if (status < 0) |
| goto fail0d; |
| 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 */ |
| cf->socket.io_offset = (unsigned long) |
| ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K); |
| if (!cf->socket.io_offset) { |
| status = -ENXIO; |
| goto fail1; |
| } |
| |
| /* reserve chip-select regions */ |
| if (!request_mem_region(io->start, resource_size(io), driver_name)) { |
| status = -ENXIO; |
| goto fail1; |
| } |
| |
| pr_info("%s: irqs det #%d, io #%d\n", driver_name, |
| 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 fail2; |
| |
| return 0; |
| |
| fail2: |
| release_mem_region(io->start, resource_size(io)); |
| fail1: |
| if (cf->socket.io_offset) |
| iounmap((void __iomem *) cf->socket.io_offset); |
| if (gpio_is_valid(board->irq_pin)) { |
| free_irq(gpio_to_irq(board->irq_pin), cf); |
| fail0d: |
| gpio_free(board->irq_pin); |
| } |
| fail0c: |
| if (gpio_is_valid(board->vcc_pin)) |
| gpio_free(board->vcc_pin); |
| fail0b: |
| gpio_free(board->rst_pin); |
| fail0a: |
| device_init_wakeup(&pdev->dev, 0); |
| free_irq(gpio_to_irq(board->det_pin), cf); |
| fail00: |
| gpio_free(board->det_pin); |
| fail0: |
| 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; |
| |
| pcmcia_unregister_socket(&cf->socket); |
| release_mem_region(io->start, resource_size(io)); |
| iounmap((void __iomem *) cf->socket.io_offset); |
| if (gpio_is_valid(board->irq_pin)) { |
| free_irq(gpio_to_irq(board->irq_pin), cf); |
| gpio_free(board->irq_pin); |
| } |
| if (gpio_is_valid(board->vcc_pin)) |
| gpio_free(board->vcc_pin); |
| gpio_free(board->rst_pin); |
| device_init_wakeup(&pdev->dev, 0); |
| free_irq(gpio_to_irq(board->det_pin), cf); |
| gpio_free(board->det_pin); |
| 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; |
| |
| 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 = (char *) driver_name, |
| .owner = THIS_MODULE, |
| }, |
| .remove = __exit_p(at91_cf_remove), |
| .suspend = at91_cf_suspend, |
| .resume = at91_cf_resume, |
| }; |
| |
| /*--------------------------------------------------------------------------*/ |
| |
| static int __init at91_cf_init(void) |
| { |
| return platform_driver_probe(&at91_cf_driver, at91_cf_probe); |
| } |
| 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"); |
| MODULE_ALIAS("platform:at91_cf"); |