[PATCH] pcmcia: OMAP CF controller
This adds a socket driver for the OMAP CF controller; it's currently in use on OSK boards. Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
David Brownell
Linus Torvalds
parent
71ed90d89e
commit
f74e48a51c
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@ -221,6 +221,13 @@ config PCMCIA_VRC4173
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tristate "NEC VRC4173 CARDU support"
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depends on CPU_VR41XX && PCI && PCMCIA
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config OMAP_CF
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tristate "OMAP CompactFlash Controller"
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depends on PCMCIA && ARCH_OMAP16XX
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help
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Say Y here to support the CompactFlash controller on OMAP.
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Note that this doesn't support "True IDE" mode.
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config PCCARD_NONSTATIC
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tristate
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@ -34,6 +34,7 @@ obj-$(CONFIG_M32R_CFC) += m32r_cfc.o
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obj-$(CONFIG_PCMCIA_AU1X00) += au1x00_ss.o
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obj-$(CONFIG_PCMCIA_VRC4171) += vrc4171_card.o
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obj-$(CONFIG_PCMCIA_VRC4173) += vrc4173_cardu.o
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obj-$(CONFIG_OMAP_CF) += omap_cf.o
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sa11xx_core-y += soc_common.o sa11xx_base.o
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pxa2xx_core-y += soc_common.o pxa2xx_base.o
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@ -0,0 +1,373 @@
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/*
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* omap_cf.c -- OMAP 16xx 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/sched.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <pcmcia/ss.h>
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#include <asm/hardware.h>
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#include <asm/io.h>
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#include <asm/mach-types.h>
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#include <asm/sizes.h>
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#include <asm/arch/mux.h>
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#include <asm/arch/tc.h>
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/* NOTE: don't expect this to support many I/O cards. The 16xx chips have
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* hard-wired timings to support Compact Flash memory cards; they won't work
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* with various other devices (like WLAN adapters) without some external
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* logic to help out.
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*
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* NOTE: CF controller docs disagree with address space docs as to where
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* CF_BASE really lives; this is a doc erratum.
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*/
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#define CF_BASE 0xfffe2800
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/* status; read after IRQ */
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#define CF_STATUS_REG __REG16(CF_BASE + 0x00)
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# define CF_STATUS_BAD_READ (1 << 2)
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# define CF_STATUS_BAD_WRITE (1 << 1)
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# define CF_STATUS_CARD_DETECT (1 << 0)
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/* which chipselect (CS0..CS3) is used for CF (active low) */
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#define CF_CFG_REG __REG16(CF_BASE + 0x02)
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/* card reset */
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#define CF_CONTROL_REG __REG16(CF_BASE + 0x04)
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# define CF_CONTROL_RESET (1 << 0)
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#define omap_cf_present() (!(CF_STATUS_REG & CF_STATUS_CARD_DETECT))
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/*--------------------------------------------------------------------------*/
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static const char driver_name[] = "omap_cf";
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struct omap_cf_socket {
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struct pcmcia_socket socket;
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struct timer_list timer;
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unsigned present:1;
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unsigned active:1;
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struct platform_device *pdev;
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unsigned long phys_cf;
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u_int irq;
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};
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#define POLL_INTERVAL (2 * HZ)
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#define SZ_2K (2 * SZ_1K)
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/*--------------------------------------------------------------------------*/
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static int omap_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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/* the timer is primarily to kick this socket's pccardd */
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static void omap_cf_timer(unsigned long _cf)
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{
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struct omap_cf_socket *cf = (void *) _cf;
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unsigned present = omap_cf_present();
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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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if (cf->active)
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mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
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}
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/* This irq handler prevents "irqNNN: nobody cared" messages as drivers
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* claim the card's IRQ. It may also detect some card insertions, but
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* not removals; it can't always eliminate timer irqs.
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*/
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static irqreturn_t omap_cf_irq(int irq, void *_cf, struct pt_regs *r)
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{
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omap_cf_timer((unsigned long)_cf);
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return IRQ_HANDLED;
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}
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static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
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{
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if (!sp)
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return -EINVAL;
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/* FIXME power management should probably be board-specific:
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* - 3VCARD vs XVCARD (OSK only handles 3VCARD)
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* - POWERON (switched on/off by set_socket)
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*/
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if (omap_cf_present()) {
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struct omap_cf_socket *cf;
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*sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
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cf = container_of(s, struct omap_cf_socket, socket);
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s->irq.AssignedIRQ = cf->irq;
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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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omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
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{
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u16 control;
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/* FIXME some non-OSK boards will support power switching */
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switch (s->Vcc) {
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case 0:
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case 33:
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break;
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default:
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return -EINVAL;
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}
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control = CF_CONTROL_REG;
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if (s->flags & SS_RESET)
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CF_CONTROL_REG = CF_CONTROL_RESET;
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else
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CF_CONTROL_REG = 0;
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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 omap_cf_ss_suspend(struct pcmcia_socket *s)
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{
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pr_debug("%s: %s\n", driver_name, __FUNCTION__);
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return omap_cf_set_socket(s, &dead_socket);
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}
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/* regions are 2K each: mem, attrib, io (and reserved-for-ide) */
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static int
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omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
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{
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struct omap_cf_socket *cf;
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cf = container_of(s, struct omap_cf_socket, socket);
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io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
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io->start = cf->phys_cf + SZ_4K;
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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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static int
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omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
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{
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struct omap_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 omap_cf_socket, socket);
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map->static_start = cf->phys_cf;
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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 += SZ_2K;
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return 0;
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}
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static struct pccard_operations omap_cf_ops = {
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.init = omap_cf_ss_init,
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.suspend = omap_cf_ss_suspend,
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.get_status = omap_cf_get_status,
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.set_socket = omap_cf_set_socket,
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.set_io_map = omap_cf_set_io_map,
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.set_mem_map = omap_cf_set_mem_map,
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};
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/*--------------------------------------------------------------------------*/
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/*
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* NOTE: right now the only board-specific platform_data is
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* "what chipselect is used". Boards could want more.
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*/
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static int __init omap_cf_probe(struct device *dev)
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{
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unsigned seg;
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struct omap_cf_socket *cf;
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struct platform_device *pdev = to_platform_device(dev);
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int irq;
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int status;
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seg = (int) dev->platform_data;
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if (seg == 0 || seg > 3)
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return -ENODEV;
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/* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
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irq = platform_get_irq(pdev, 0);
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if (!irq)
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return -EINVAL;
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cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
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if (!cf)
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return -ENOMEM;
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init_timer(&cf->timer);
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cf->timer.function = omap_cf_timer;
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cf->timer.data = (unsigned long) cf;
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cf->pdev = pdev;
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dev_set_drvdata(dev, cf);
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/* this primarily just shuts up irq handling noise */
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status = request_irq(irq, omap_cf_irq, SA_SHIRQ,
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driver_name, cf);
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if (status < 0)
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goto fail0;
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cf->irq = irq;
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cf->socket.pci_irq = irq;
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switch (seg) {
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/* NOTE: CS0 could be configured too ... */
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case 1:
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cf->phys_cf = OMAP_CS1_PHYS;
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break;
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case 2:
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cf->phys_cf = OMAP_CS2_PHYS;
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break;
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case 3:
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cf->phys_cf = omap_cs3_phys();
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break;
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default:
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goto fail1;
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}
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/* pcmcia layer only remaps "real" memory */
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cf->socket.io_offset = (unsigned long)
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ioremap(cf->phys_cf + SZ_4K, SZ_2K);
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if (!cf->socket.io_offset)
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goto fail1;
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if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
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goto fail1;
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/* NOTE: CF conflicts with MMC1 */
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omap_cfg_reg(W11_1610_CF_CD1);
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omap_cfg_reg(P11_1610_CF_CD2);
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omap_cfg_reg(R11_1610_CF_IOIS16);
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omap_cfg_reg(V10_1610_CF_IREQ);
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omap_cfg_reg(W10_1610_CF_RESET);
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CF_CFG_REG = ~(1 << seg);
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pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
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/* NOTE: better EMIFS setup might support more cards; but the
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* TRM only shows how to affect regular flash signals, not their
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* CF/PCMCIA variants...
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*/
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pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
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seg, EMIFS_CCS(seg), EMIFS_ACS(seg));
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EMIFS_CCS(seg) = 0x0004a1b3; /* synch mode 4 etc */
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EMIFS_ACS(seg) = 0x00000000; /* OE hold/setup */
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/* CF uses armxor_ck, which is "always" available */
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pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
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CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
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omap_cf_present() ? "present" : "(not present)");
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cf->socket.owner = THIS_MODULE;
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cf->socket.dev.dev = dev;
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cf->socket.ops = &omap_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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status = pcmcia_register_socket(&cf->socket);
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if (status < 0)
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goto fail2;
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cf->active = 1;
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mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
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return 0;
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fail2:
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iounmap((void __iomem *) cf->socket.io_offset);
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release_mem_region(cf->phys_cf, SZ_8K);
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fail1:
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free_irq(irq, cf);
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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 __devexit omap_cf_remove(struct device *dev)
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{
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struct omap_cf_socket *cf = dev_get_drvdata(dev);
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cf->active = 0;
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pcmcia_unregister_socket(&cf->socket);
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del_timer_sync(&cf->timer);
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iounmap((void __iomem *) cf->socket.io_offset);
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release_mem_region(cf->phys_cf, SZ_8K);
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free_irq(cf->irq, cf);
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kfree(cf);
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return 0;
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}
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static int omap_cf_suspend(struct device *dev, pm_message_t mesg, u32 level)
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{
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if (level != SUSPEND_SAVE_STATE)
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return 0;
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return pcmcia_socket_dev_suspend(dev, mesg);
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}
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static int omap_cf_resume(struct device *dev, u32 level)
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{
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if (level != RESUME_RESTORE_STATE)
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return 0;
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return pcmcia_socket_dev_resume(dev);
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}
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static struct device_driver omap_cf_driver = {
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.name = (char *) driver_name,
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.bus = &platform_bus_type,
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.probe = omap_cf_probe,
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.remove = __devexit_p(omap_cf_remove),
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.suspend = omap_cf_suspend,
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.resume = omap_cf_resume,
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};
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static int __init omap_cf_init(void)
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{
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if (cpu_is_omap16xx())
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driver_register(&omap_cf_driver);
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return 0;
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}
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static void __exit omap_cf_exit(void)
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{
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if (cpu_is_omap16xx())
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driver_unregister(&omap_cf_driver);
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}
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module_init(omap_cf_init);
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module_exit(omap_cf_exit);
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MODULE_DESCRIPTION("OMAP CF Driver");
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MODULE_LICENSE("GPL");
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