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bcd2360c1f
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Cc: Nicolas Ferre <nicolas.ferre@atmel.com>
420 lines
10 KiB
C
420 lines
10 KiB
C
/*
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* at91_cf.c -- AT91 CompactFlash controller driver
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*
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* Copyright (C) 2005 David Brownell
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/gpio.h>
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#include <linux/platform_data/atmel.h>
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#include <pcmcia/ss.h>
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#include <mach/hardware.h>
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#include <asm/io.h>
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#include <asm/sizes.h>
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#include <mach/at91rm9200_mc.h>
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#include <mach/at91_ramc.h>
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/*
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* A0..A10 work in each range; A23 indicates I/O space; A25 is CFRNW;
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* some other bit in {A24,A22..A11} is nREG to flag memory access
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* (vs attributes). So more than 2KB/region would just be waste.
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* Note: These are offsets from the physical base address.
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*/
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#define CF_ATTR_PHYS (0)
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#define CF_IO_PHYS (1 << 23)
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#define CF_MEM_PHYS (0x017ff800)
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/*--------------------------------------------------------------------------*/
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static const char driver_name[] = "at91_cf";
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struct at91_cf_socket {
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struct pcmcia_socket socket;
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unsigned present:1;
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struct platform_device *pdev;
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struct at91_cf_data *board;
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unsigned long phys_baseaddr;
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};
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static inline int at91_cf_present(struct at91_cf_socket *cf)
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{
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return !gpio_get_value(cf->board->det_pin);
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}
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/*--------------------------------------------------------------------------*/
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static int at91_cf_ss_init(struct pcmcia_socket *s)
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{
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return 0;
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}
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static irqreturn_t at91_cf_irq(int irq, void *_cf)
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{
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struct at91_cf_socket *cf = _cf;
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if (irq == gpio_to_irq(cf->board->det_pin)) {
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unsigned present = at91_cf_present(cf);
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/* kick pccard as needed */
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if (present != cf->present) {
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cf->present = present;
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pr_debug("%s: card %s\n", driver_name,
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present ? "present" : "gone");
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pcmcia_parse_events(&cf->socket, SS_DETECT);
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}
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}
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return IRQ_HANDLED;
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}
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static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
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{
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struct at91_cf_socket *cf;
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if (!sp)
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return -EINVAL;
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cf = container_of(s, struct at91_cf_socket, socket);
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/* NOTE: CF is always 3VCARD */
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if (at91_cf_present(cf)) {
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int rdy = gpio_is_valid(cf->board->irq_pin); /* RDY/nIRQ */
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int vcc = gpio_is_valid(cf->board->vcc_pin);
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*sp = SS_DETECT | SS_3VCARD;
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if (!rdy || gpio_get_value(rdy))
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*sp |= SS_READY;
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if (!vcc || gpio_get_value(vcc))
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*sp |= SS_POWERON;
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} else
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*sp = 0;
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return 0;
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}
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static int
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at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
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{
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struct at91_cf_socket *cf;
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cf = container_of(sock, struct at91_cf_socket, socket);
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/* switch Vcc if needed and possible */
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if (gpio_is_valid(cf->board->vcc_pin)) {
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switch (s->Vcc) {
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case 0:
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gpio_set_value(cf->board->vcc_pin, 0);
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break;
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case 33:
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gpio_set_value(cf->board->vcc_pin, 1);
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break;
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default:
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return -EINVAL;
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}
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}
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/* toggle reset if needed */
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gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
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pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
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driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
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return 0;
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}
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static int at91_cf_ss_suspend(struct pcmcia_socket *s)
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{
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return at91_cf_set_socket(s, &dead_socket);
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}
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/* we already mapped the I/O region */
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static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
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{
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struct at91_cf_socket *cf;
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u32 csr;
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cf = container_of(s, struct at91_cf_socket, socket);
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io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
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/*
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* Use 16 bit accesses unless/until we need 8-bit i/o space.
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*/
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csr = at91_ramc_read(0, AT91_SMC_CSR(cf->board->chipselect)) & ~AT91_SMC_DBW;
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/*
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* NOTE: this CF controller ignores IOIS16, so we can't really do
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* MAP_AUTOSZ. The 16bit mode allows single byte access on either
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* D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
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* purposes (and handles ide-cs).
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*
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* The 8bit mode is needed for odd byte access on D0-D7. It seems
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* some cards only like that way to get at the odd byte, despite
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* CF 3.0 spec table 35 also giving the D8-D15 option.
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*/
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if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
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csr |= AT91_SMC_DBW_8;
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pr_debug("%s: 8bit i/o bus\n", driver_name);
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} else {
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csr |= AT91_SMC_DBW_16;
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pr_debug("%s: 16bit i/o bus\n", driver_name);
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}
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at91_ramc_write(0, AT91_SMC_CSR(cf->board->chipselect), csr);
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io->start = cf->socket.io_offset;
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io->stop = io->start + SZ_2K - 1;
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return 0;
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}
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/* pcmcia layer maps/unmaps mem regions */
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static int
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at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
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{
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struct at91_cf_socket *cf;
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if (map->card_start)
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return -EINVAL;
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cf = container_of(s, struct at91_cf_socket, socket);
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map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
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if (map->flags & MAP_ATTRIB)
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map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
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else
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map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
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return 0;
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}
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static struct pccard_operations at91_cf_ops = {
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.init = at91_cf_ss_init,
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.suspend = at91_cf_ss_suspend,
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.get_status = at91_cf_get_status,
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.set_socket = at91_cf_set_socket,
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.set_io_map = at91_cf_set_io_map,
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.set_mem_map = at91_cf_set_mem_map,
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};
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/*--------------------------------------------------------------------------*/
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static int __init at91_cf_probe(struct platform_device *pdev)
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{
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struct at91_cf_socket *cf;
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struct at91_cf_data *board = pdev->dev.platform_data;
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struct resource *io;
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int status;
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if (!board || !gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
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return -ENODEV;
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io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!io)
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return -ENODEV;
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cf = kzalloc(sizeof *cf, GFP_KERNEL);
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if (!cf)
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return -ENOMEM;
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cf->board = board;
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cf->pdev = pdev;
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cf->phys_baseaddr = io->start;
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platform_set_drvdata(pdev, cf);
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/* must be a GPIO; ergo must trigger on both edges */
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status = gpio_request(board->det_pin, "cf_det");
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if (status < 0)
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goto fail0;
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status = request_irq(gpio_to_irq(board->det_pin), at91_cf_irq, 0, driver_name, cf);
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if (status < 0)
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goto fail00;
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device_init_wakeup(&pdev->dev, 1);
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status = gpio_request(board->rst_pin, "cf_rst");
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if (status < 0)
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goto fail0a;
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if (gpio_is_valid(board->vcc_pin)) {
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status = gpio_request(board->vcc_pin, "cf_vcc");
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if (status < 0)
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goto fail0b;
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}
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/*
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* The card driver will request this irq later as needed.
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* but it causes lots of "irqNN: nobody cared" messages
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* unless we report that we handle everything (sigh).
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* (Note: DK board doesn't wire the IRQ pin...)
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*/
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if (gpio_is_valid(board->irq_pin)) {
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status = gpio_request(board->irq_pin, "cf_irq");
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if (status < 0)
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goto fail0c;
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status = request_irq(gpio_to_irq(board->irq_pin), at91_cf_irq,
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IRQF_SHARED, driver_name, cf);
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if (status < 0)
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goto fail0d;
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cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
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} else
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cf->socket.pci_irq = nr_irqs + 1;
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/* pcmcia layer only remaps "real" memory not iospace */
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cf->socket.io_offset = (unsigned long)
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ioremap(cf->phys_baseaddr + CF_IO_PHYS, SZ_2K);
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if (!cf->socket.io_offset) {
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status = -ENXIO;
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goto fail1;
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}
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/* reserve chip-select regions */
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if (!request_mem_region(io->start, resource_size(io), driver_name)) {
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status = -ENXIO;
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goto fail1;
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}
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pr_info("%s: irqs det #%d, io #%d\n", driver_name,
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gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
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cf->socket.owner = THIS_MODULE;
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cf->socket.dev.parent = &pdev->dev;
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cf->socket.ops = &at91_cf_ops;
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cf->socket.resource_ops = &pccard_static_ops;
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cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
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| SS_CAP_MEM_ALIGN;
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cf->socket.map_size = SZ_2K;
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cf->socket.io[0].res = io;
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status = pcmcia_register_socket(&cf->socket);
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if (status < 0)
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goto fail2;
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return 0;
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fail2:
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release_mem_region(io->start, resource_size(io));
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fail1:
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if (cf->socket.io_offset)
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iounmap((void __iomem *) cf->socket.io_offset);
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if (gpio_is_valid(board->irq_pin)) {
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free_irq(gpio_to_irq(board->irq_pin), cf);
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fail0d:
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gpio_free(board->irq_pin);
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}
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fail0c:
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if (gpio_is_valid(board->vcc_pin))
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gpio_free(board->vcc_pin);
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fail0b:
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gpio_free(board->rst_pin);
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fail0a:
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device_init_wakeup(&pdev->dev, 0);
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free_irq(gpio_to_irq(board->det_pin), cf);
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fail00:
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gpio_free(board->det_pin);
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fail0:
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kfree(cf);
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return status;
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}
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static int __exit at91_cf_remove(struct platform_device *pdev)
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{
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struct at91_cf_socket *cf = platform_get_drvdata(pdev);
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struct at91_cf_data *board = cf->board;
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struct resource *io = cf->socket.io[0].res;
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pcmcia_unregister_socket(&cf->socket);
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release_mem_region(io->start, resource_size(io));
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iounmap((void __iomem *) cf->socket.io_offset);
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if (gpio_is_valid(board->irq_pin)) {
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free_irq(gpio_to_irq(board->irq_pin), cf);
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gpio_free(board->irq_pin);
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}
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if (gpio_is_valid(board->vcc_pin))
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gpio_free(board->vcc_pin);
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gpio_free(board->rst_pin);
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device_init_wakeup(&pdev->dev, 0);
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free_irq(gpio_to_irq(board->det_pin), cf);
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gpio_free(board->det_pin);
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kfree(cf);
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return 0;
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}
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#ifdef CONFIG_PM
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static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
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{
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struct at91_cf_socket *cf = platform_get_drvdata(pdev);
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struct at91_cf_data *board = cf->board;
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if (device_may_wakeup(&pdev->dev)) {
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enable_irq_wake(gpio_to_irq(board->det_pin));
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if (gpio_is_valid(board->irq_pin))
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enable_irq_wake(gpio_to_irq(board->irq_pin));
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}
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return 0;
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}
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static int at91_cf_resume(struct platform_device *pdev)
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{
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struct at91_cf_socket *cf = platform_get_drvdata(pdev);
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struct at91_cf_data *board = cf->board;
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if (device_may_wakeup(&pdev->dev)) {
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disable_irq_wake(gpio_to_irq(board->det_pin));
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if (gpio_is_valid(board->irq_pin))
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disable_irq_wake(gpio_to_irq(board->irq_pin));
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}
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return 0;
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}
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#else
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#define at91_cf_suspend NULL
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#define at91_cf_resume NULL
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#endif
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static struct platform_driver at91_cf_driver = {
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.driver = {
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.name = (char *) driver_name,
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.owner = THIS_MODULE,
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},
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.remove = __exit_p(at91_cf_remove),
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.suspend = at91_cf_suspend,
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.resume = at91_cf_resume,
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};
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/*--------------------------------------------------------------------------*/
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static int __init at91_cf_init(void)
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{
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return platform_driver_probe(&at91_cf_driver, at91_cf_probe);
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}
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module_init(at91_cf_init);
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static void __exit at91_cf_exit(void)
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{
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platform_driver_unregister(&at91_cf_driver);
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}
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module_exit(at91_cf_exit);
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MODULE_DESCRIPTION("AT91 Compact Flash Driver");
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MODULE_AUTHOR("David Brownell");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:at91_cf");
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