[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 <[e-mail]>
Signed-off-by: Dominik Brodowski <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/pcmcia/Kconfig

···
 	tristate "NEC VRC4173 CARDU support"
 	depends on CPU_VR41XX && PCI && PCMCIA
 
+config OMAP_CF
+	tristate "OMAP CompactFlash Controller"
+	depends on PCMCIA && ARCH_OMAP16XX
+	help
+	  Say Y here to support the CompactFlash controller on OMAP.
+	  Note that this doesn't support "True IDE" mode.
+
 config PCCARD_NONSTATIC
 	tristate
 

drivers/pcmcia/Makefile

···
 obj-$(CONFIG_PCMCIA_AU1X00)			+= au1x00_ss.o
 obj-$(CONFIG_PCMCIA_VRC4171)			+= vrc4171_card.o
 obj-$(CONFIG_PCMCIA_VRC4173)			+= vrc4173_cardu.o
+obj-$(CONFIG_OMAP_CF)				+= omap_cf.o
 
 sa11xx_core-y					+= soc_common.o sa11xx_base.o
 pxa2xx_core-y					+= soc_common.o pxa2xx_base.o

drivers/pcmcia/omap_cf.c

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