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 <linux/io.h>
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#include <linux/sizes.h>
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#include <linux/mfd/syscon.h>
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#include <linux/mfd/syscon/atmel-mc.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/of_gpio.h>
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#include <linux/regmap.h>
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#include <pcmcia/ss.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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struct regmap *mc;
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/*--------------------------------------------------------------------------*/
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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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dev_dbg(&cf->pdev->dev, "card %s\n",
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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(cf->board->irq_pin))
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*sp |= SS_READY;
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if (!vcc || gpio_get_value(cf->board->vcc_pin))
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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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dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n",
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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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* 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_MC_SMC_DBW_8;
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dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
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} else {
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csr = AT91_MC_SMC_DBW_16;
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dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
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}
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regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect),
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AT91_MC_SMC_DBW, 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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#if defined(CONFIG_OF)
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static const struct of_device_id at91_cf_dt_ids[] = {
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{ .compatible = "atmel,at91rm9200-cf" },
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);
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static int at91_cf_dt_init(struct platform_device *pdev)
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{
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struct at91_cf_data *board;
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board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
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if (!board)
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return -ENOMEM;
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board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
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board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
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board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
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board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);
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pdev->dev.platform_data = board;
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mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc");
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return PTR_ERR_OR_ZERO(mc);
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}
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#else
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static int at91_cf_dt_init(struct platform_device *pdev)
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{
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return -ENODEV;
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}
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#endif
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static int 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) {
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status = at91_cf_dt_init(pdev);
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if (status)
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return status;
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board = pdev->dev.platform_data;
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}
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if (!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 = devm_kzalloc(&pdev->dev, 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 = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
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if (status < 0)
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return status;
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status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
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at91_cf_irq, 0, "at91_cf detect", cf);
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if (status < 0)
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return status;
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device_init_wakeup(&pdev->dev, 1);
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status = devm_gpio_request(&pdev->dev, 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 = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
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if (status < 0)
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goto fail0a;
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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 = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
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if (status < 0)
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goto fail0a;
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status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
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at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
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if (status < 0)
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goto fail0a;
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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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/*
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* pcmcia layer only remaps "real" memory not iospace
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* io_offset is set to 0x10000 to avoid the check in static_find_io().
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* */
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cf->socket.io_offset = 0x10000;
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status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS);
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if (status)
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goto fail0a;
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/* reserve chip-select regions */
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if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
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status = -ENXIO;
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goto fail0a;
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}
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dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
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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 fail0a;
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return 0;
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fail0a:
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device_init_wakeup(&pdev->dev, 0);
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return status;
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}
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static int 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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pcmcia_unregister_socket(&cf->socket);
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device_init_wakeup(&pdev->dev, 0);
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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 = "at91_cf",
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.of_match_table = of_match_ptr(at91_cf_dt_ids),
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},
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.probe = at91_cf_probe,
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.remove = 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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module_platform_driver(at91_cf_driver);
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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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