1 files changed, 355 insertions, 0 deletions
diff --git a/drivers/pcmcia/omap_cf.c b/drivers/pcmcia/omap_cf.c
new file mode 100644
index 000000000..d3ef55349
--- /dev/null
+++ b/drivers/pcmcia/omap_cf.c
@@ -0,0 +1,355 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * omap_cf.c -- OMAP 16xx CompactFlash controller driver
+ *
+ * Copyright (c) 2005 David Brownell
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+
+#include <pcmcia/ss.h>
+
+#include <mach/hardware.h>
+#include <asm/io.h>
+#include <linux/sizes.h>
+
+#include <mach/mux.h>
+#include <mach/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			(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				(CF_BASE + 0x02)
+
+/* card reset */
+#define CF_CONTROL			(CF_BASE + 0x04)
+#	define	CF_CONTROL_RESET	(1 << 0)
+
+#define omap_cf_present() (!(omap_readw(CF_STATUS) & 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;
+	struct resource		iomem;
+};
+
+#define	POLL_INTERVAL		(2 * HZ)
+
+/*--------------------------------------------------------------------------*/
+
+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(struct timer_list *t)
+{
+	struct omap_cf_socket	*cf = from_timer(cf, t, timer);
+	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 omap_cf_socket *cf = (struct omap_cf_socket *)_cf;
+
+	omap_cf_timer(&cf->timer);
+	return IRQ_HANDLED;
+}
+
+static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
+{
+	if (!sp)
+		return -EINVAL;
+
+	/* NOTE CF is always 3VCARD */
+	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->pcmcia_irq = 0;
+		s->pci_irq = cf->irq;
+	} else
+		*sp = 0;
+	return 0;
+}
+
+static int
+omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
+{
+	u16		control;
+
+	/* REVISIT some non-OSK boards may support power switching */
+	switch (s->Vcc) {
+	case 0:
+	case 33:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	control = omap_readw(CF_CONTROL);
+	if (s->flags & SS_RESET)
+		omap_writew(CF_CONTROL_RESET, CF_CONTROL);
+	else
+		omap_writew(0, CF_CONTROL);
+
+	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, __func__);
+	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 platform_device *pdev)
+{
+	unsigned		seg;
+	struct omap_cf_socket	*cf;
+	int			irq;
+	int			status;
+
+	seg = (int) pdev->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 < 0)
+		return -EINVAL;
+
+	cf = kzalloc(sizeof *cf, GFP_KERNEL);
+	if (!cf)
+		return -ENOMEM;
+	timer_setup(&cf->timer, omap_cf_timer, 0);
+
+	cf->pdev = pdev;
+	platform_set_drvdata(pdev, cf);
+
+	/* this primarily just shuts up irq handling noise */
+	status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
+			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;
+	}
+	cf->iomem.start = cf->phys_cf;
+	cf->iomem.end = cf->iomem.end + SZ_8K - 1;
+	cf->iomem.flags = IORESOURCE_MEM;
+
+	/* 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);
+
+	omap_writew(~(1 << seg), CF_CFG);
+
+	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, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
+	omap_writel(0x0004a1b3, EMIFS_CCS(seg));	/* synch mode 4 etc */
+	omap_writel(0x00000000, EMIFS_ACS(seg));	/* OE hold/setup */
+
+	/* CF uses armxor_ck, which is "always" available */
+
+	pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
+		omap_readw(CF_STATUS), omap_readw(CF_CFG),
+		omap_readw(CF_CONTROL),
+		omap_cf_present() ? "present" : "(not present)");
+
+	cf->socket.owner = THIS_MODULE;
+	cf->socket.dev.parent = &pdev->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;
+	cf->socket.io[0].res = &cf->iomem;
+
+	status = pcmcia_register_socket(&cf->socket);
+	if (status < 0)
+		goto fail2;
+
+	cf->active = 1;
+	mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
+	return 0;
+
+fail2:
+	release_mem_region(cf->phys_cf, SZ_8K);
+fail1:
+	if (cf->socket.io_offset)
+		iounmap((void __iomem *) cf->socket.io_offset);
+	free_irq(irq, cf);
+fail0:
+	kfree(cf);
+	return status;
+}
+
+static int __exit omap_cf_remove(struct platform_device *pdev)
+{
+	struct omap_cf_socket *cf = platform_get_drvdata(pdev);
+
+	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 struct platform_driver omap_cf_driver = {
+	.driver = {
+		.name	= driver_name,
+	},
+	.remove		= __exit_p(omap_cf_remove),
+};
+
+static int __init omap_cf_init(void)
+{
+	if (cpu_is_omap16xx())
+		return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
+	return -ENODEV;
+}
+
+static void __exit omap_cf_exit(void)
+{
+	if (cpu_is_omap16xx())
+		platform_driver_unregister(&omap_cf_driver);
+}
+
+module_init(omap_cf_init);
+module_exit(omap_cf_exit);
+
+MODULE_DESCRIPTION("OMAP CF Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:omap_cf");