Initial import

1 files changed, 820 insertions, 0 deletions

diff --git a/drivers/pcmcia/soc_common.c b/drivers/pcmcia/soc_common.c
new file mode 100644
index 000000000..eed5e9c05
--- /dev/null
+++ b/drivers/pcmcia/soc_common.c
@@ -0,0 +1,820 @@
+/*======================================================================
+
+    Common support code for the PCMCIA control functionality of
+    integrated SOCs like the SA-11x0 and PXA2xx microprocessors.
+
+    The contents of this file are subject to the Mozilla Public
+    License Version 1.1 (the "License"); you may not use this file
+    except in compliance with the License. You may obtain a copy of
+    the License at http://www.mozilla.org/MPL/
+
+    Software distributed under the License is distributed on an "AS
+    IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+    implied. See the License for the specific language governing
+    rights and limitations under the License.
+
+    The initial developer of the original code is John G. Dorsey
+    <john+@cs.cmu.edu>.  Portions created by John G. Dorsey are
+    Copyright (C) 1999 John G. Dorsey.  All Rights Reserved.
+
+    Alternatively, the contents of this file may be used under the
+    terms of the GNU Public License version 2 (the "GPL"), in which
+    case the provisions of the GPL are applicable instead of the
+    above.  If you wish to allow the use of your version of this file
+    only under the terms of the GPL and not to allow others to use
+    your version of this file under the MPL, indicate your decision
+    by deleting the provisions above and replace them with the notice
+    and other provisions required by the GPL.  If you do not delete
+    the provisions above, a recipient may use your version of this
+    file under either the MPL or the GPL.
+
+======================================================================*/
+
+
+#include <linux/cpufreq.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/mutex.h>
+#include <linux/spinlock.h>
+#include <linux/timer.h>
+
+#include <mach/hardware.h>
+
+#include "soc_common.h"
+
+static irqreturn_t soc_common_pcmcia_interrupt(int irq, void *dev);
+
+#ifdef CONFIG_PCMCIA_DEBUG
+
+static int pc_debug;
+module_param(pc_debug, int, 0644);
+
+void soc_pcmcia_debug(struct soc_pcmcia_socket *skt, const char *func,
+		      int lvl, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+	if (pc_debug > lvl) {
+		va_start(args, fmt);
+
+		vaf.fmt = fmt;
+		vaf.va = &args;
+
+		printk(KERN_DEBUG "skt%u: %s: %pV", skt->nr, func, &vaf);
+
+		va_end(args);
+	}
+}
+EXPORT_SYMBOL(soc_pcmcia_debug);
+
+#endif
+
+#define to_soc_pcmcia_socket(x)	\
+	container_of(x, struct soc_pcmcia_socket, socket)
+
+static unsigned short
+calc_speed(unsigned short *spds, int num, unsigned short dflt)
+{
+	unsigned short speed = 0;
+	int i;
+
+	for (i = 0; i < num; i++)
+		if (speed < spds[i])
+			speed = spds[i];
+	if (speed == 0)
+		speed = dflt;
+
+	return speed;
+}
+
+void soc_common_pcmcia_get_timing(struct soc_pcmcia_socket *skt,
+	struct soc_pcmcia_timing *timing)
+{
+	timing->io =
+		calc_speed(skt->spd_io, MAX_IO_WIN, SOC_PCMCIA_IO_ACCESS);
+	timing->mem =
+		calc_speed(skt->spd_mem, MAX_WIN, SOC_PCMCIA_3V_MEM_ACCESS);
+	timing->attr =
+		calc_speed(skt->spd_attr, MAX_WIN, SOC_PCMCIA_3V_MEM_ACCESS);
+}
+EXPORT_SYMBOL(soc_common_pcmcia_get_timing);
+
+static void __soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt,
+	unsigned int nr)
+{
+	unsigned int i;
+
+	for (i = 0; i < nr; i++) {
+		if (skt->stat[i].irq)
+			free_irq(skt->stat[i].irq, skt);
+		if (gpio_is_valid(skt->stat[i].gpio))
+			gpio_free(skt->stat[i].gpio);
+	}
+
+	if (skt->ops->hw_shutdown)
+		skt->ops->hw_shutdown(skt);
+
+	clk_disable_unprepare(skt->clk);
+}
+
+static void soc_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
+{
+	__soc_pcmcia_hw_shutdown(skt, ARRAY_SIZE(skt->stat));
+}
+
+static int soc_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+	int ret = 0, i;
+
+	clk_prepare_enable(skt->clk);
+
+	if (skt->ops->hw_init) {
+		ret = skt->ops->hw_init(skt);
+		if (ret)
+			return ret;
+	}
+
+	for (i = 0; i < ARRAY_SIZE(skt->stat); i++) {
+		if (gpio_is_valid(skt->stat[i].gpio)) {
+			int irq;
+
+			ret = gpio_request_one(skt->stat[i].gpio, GPIOF_IN,
+					       skt->stat[i].name);
+			if (ret) {
+				__soc_pcmcia_hw_shutdown(skt, i);
+				return ret;
+			}
+
+			irq = gpio_to_irq(skt->stat[i].gpio);
+
+			if (i == SOC_STAT_RDY)
+				skt->socket.pci_irq = irq;
+			else
+				skt->stat[i].irq = irq;
+		}
+
+		if (skt->stat[i].irq) {
+			ret = request_irq(skt->stat[i].irq,
+					  soc_common_pcmcia_interrupt,
+					  IRQF_TRIGGER_NONE,
+					  skt->stat[i].name, skt);
+			if (ret) {
+				if (gpio_is_valid(skt->stat[i].gpio))
+					gpio_free(skt->stat[i].gpio);
+				__soc_pcmcia_hw_shutdown(skt, i);
+				return ret;
+			}
+		}
+	}
+
+	return ret;
+}
+
+static void soc_pcmcia_hw_enable(struct soc_pcmcia_socket *skt)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
+		if (skt->stat[i].irq) {
+			irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_EDGE_RISING);
+			irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_EDGE_BOTH);
+		}
+}
+
+static void soc_pcmcia_hw_disable(struct soc_pcmcia_socket *skt)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
+		if (skt->stat[i].irq)
+			irq_set_irq_type(skt->stat[i].irq, IRQ_TYPE_NONE);
+}
+
+static unsigned int soc_common_pcmcia_skt_state(struct soc_pcmcia_socket *skt)
+{
+	struct pcmcia_state state;
+	unsigned int stat;
+
+	memset(&state, 0, sizeof(struct pcmcia_state));
+
+	/* Make battery voltage state report 'good' */
+	state.bvd1 = 1;
+	state.bvd2 = 1;
+
+	/* CD is active low by default */
+	if (gpio_is_valid(skt->stat[SOC_STAT_CD].gpio))
+		state.detect = !gpio_get_value(skt->stat[SOC_STAT_CD].gpio);
+
+	/* RDY and BVD are active high by default */
+	if (gpio_is_valid(skt->stat[SOC_STAT_RDY].gpio))
+		state.ready = !!gpio_get_value(skt->stat[SOC_STAT_RDY].gpio);
+	if (gpio_is_valid(skt->stat[SOC_STAT_BVD1].gpio))
+		state.bvd1 = !!gpio_get_value(skt->stat[SOC_STAT_BVD1].gpio);
+	if (gpio_is_valid(skt->stat[SOC_STAT_BVD2].gpio))
+		state.bvd2 = !!gpio_get_value(skt->stat[SOC_STAT_BVD2].gpio);
+
+	skt->ops->socket_state(skt, &state);
+
+	stat = state.detect  ? SS_DETECT : 0;
+	stat |= state.ready  ? SS_READY  : 0;
+	stat |= state.wrprot ? SS_WRPROT : 0;
+	stat |= state.vs_3v  ? SS_3VCARD : 0;
+	stat |= state.vs_Xv  ? SS_XVCARD : 0;
+
+	/* The power status of individual sockets is not available
+	 * explicitly from the hardware, so we just remember the state
+	 * and regurgitate it upon request:
+	 */
+	stat |= skt->cs_state.Vcc ? SS_POWERON : 0;
+
+	if (skt->cs_state.flags & SS_IOCARD)
+		stat |= state.bvd1 ? SS_STSCHG : 0;
+	else {
+		if (state.bvd1 == 0)
+			stat |= SS_BATDEAD;
+		else if (state.bvd2 == 0)
+			stat |= SS_BATWARN;
+	}
+	return stat;
+}
+
+/*
+ * soc_common_pcmcia_config_skt
+ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ *
+ * Convert PCMCIA socket state to our socket configure structure.
+ */
+static int soc_common_pcmcia_config_skt(
+	struct soc_pcmcia_socket *skt, socket_state_t *state)
+{
+	int ret;
+
+	ret = skt->ops->configure_socket(skt, state);
+	if (ret == 0) {
+		/*
+		 * This really needs a better solution.  The IRQ
+		 * may or may not be claimed by the driver.
+		 */
+		if (skt->irq_state != 1 && state->io_irq) {
+			skt->irq_state = 1;
+			irq_set_irq_type(skt->socket.pci_irq,
+					 IRQ_TYPE_EDGE_FALLING);
+		} else if (skt->irq_state == 1 && state->io_irq == 0) {
+			skt->irq_state = 0;
+			irq_set_irq_type(skt->socket.pci_irq, IRQ_TYPE_NONE);
+		}
+
+		skt->cs_state = *state;
+	}
+
+	if (ret < 0)
+		printk(KERN_ERR "soc_common_pcmcia: unable to configure "
+		       "socket %d\n", skt->nr);
+
+	return ret;
+}
+
+/* soc_common_pcmcia_sock_init()
+ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ *
+ * (Re-)Initialise the socket, turning on status interrupts
+ * and PCMCIA bus.  This must wait for power to stabilise
+ * so that the card status signals report correctly.
+ *
+ * Returns: 0
+ */
+static int soc_common_pcmcia_sock_init(struct pcmcia_socket *sock)
+{
+	struct soc_pcmcia_socket *skt = to_soc_pcmcia_socket(sock);
+
+	debug(skt, 2, "initializing socket\n");
+	if (skt->ops->socket_init)
+		skt->ops->socket_init(skt);
+	soc_pcmcia_hw_enable(skt);
+	return 0;
+}
+
+
+/*
+ * soc_common_pcmcia_suspend()
+ * ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ *
+ * Remove power on the socket, disable IRQs from the card.
+ * Turn off status interrupts, and disable the PCMCIA bus.
+ *
+ * Returns: 0
+ */
+static int soc_common_pcmcia_suspend(struct pcmcia_socket *sock)
+{
+	struct soc_pcmcia_socket *skt = to_soc_pcmcia_socket(sock);
+
+	debug(skt, 2, "suspending socket\n");
+
+	soc_pcmcia_hw_disable(skt);
+	if (skt->ops->socket_suspend)
+		skt->ops->socket_suspend(skt);
+
+	return 0;
+}
+
+static DEFINE_SPINLOCK(status_lock);
+
+static void soc_common_check_status(struct soc_pcmcia_socket *skt)
+{
+	unsigned int events;
+
+	debug(skt, 4, "entering PCMCIA monitoring thread\n");
+
+	do {
+		unsigned int status;
+		unsigned long flags;
+
+		status = soc_common_pcmcia_skt_state(skt);
+
+		spin_lock_irqsave(&status_lock, flags);
+		events = (status ^ skt->status) & skt->cs_state.csc_mask;
+		skt->status = status;
+		spin_unlock_irqrestore(&status_lock, flags);
+
+		debug(skt, 4, "events: %s%s%s%s%s%s\n",
+			events == 0         ? "<NONE>"   : "",
+			events & SS_DETECT  ? "DETECT "  : "",
+			events & SS_READY   ? "READY "   : "",
+			events & SS_BATDEAD ? "BATDEAD " : "",
+			events & SS_BATWARN ? "BATWARN " : "",
+			events & SS_STSCHG  ? "STSCHG "  : "");
+
+		if (events)
+			pcmcia_parse_events(&skt->socket, events);
+	} while (events);
+}
+
+/* Let's poll for events in addition to IRQs since IRQ only is unreliable... */
+static void soc_common_pcmcia_poll_event(unsigned long dummy)
+{
+	struct soc_pcmcia_socket *skt = (struct soc_pcmcia_socket *)dummy;
+	debug(skt, 4, "polling for events\n");
+
+	mod_timer(&skt->poll_timer, jiffies + SOC_PCMCIA_POLL_PERIOD);
+
+	soc_common_check_status(skt);
+}
+
+
+/*
+ * Service routine for socket driver interrupts (requested by the
+ * low-level PCMCIA init() operation via soc_common_pcmcia_thread()).
+ * The actual interrupt-servicing work is performed by
+ * soc_common_pcmcia_thread(), largely because the Card Services event-
+ * handling code performs scheduling operations which cannot be
+ * executed from within an interrupt context.
+ */
+static irqreturn_t soc_common_pcmcia_interrupt(int irq, void *dev)
+{
+	struct soc_pcmcia_socket *skt = dev;
+
+	debug(skt, 3, "servicing IRQ %d\n", irq);
+
+	soc_common_check_status(skt);
+
+	return IRQ_HANDLED;
+}
+
+
+/*
+ *  Implements the get_status() operation for the in-kernel PCMCIA
+ * service (formerly SS_GetStatus in Card Services). Essentially just
+ * fills in bits in `status' according to internal driver state or
+ * the value of the voltage detect chipselect register.
+ *
+ * As a debugging note, during card startup, the PCMCIA core issues
+ * three set_socket() commands in a row the first with RESET deasserted,
+ * the second with RESET asserted, and the last with RESET deasserted
+ * again. Following the third set_socket(), a get_status() command will
+ * be issued. The kernel is looking for the SS_READY flag (see
+ * setup_socket(), reset_socket(), and unreset_socket() in cs.c).
+ *
+ * Returns: 0
+ */
+static int
+soc_common_pcmcia_get_status(struct pcmcia_socket *sock, unsigned int *status)
+{
+	struct soc_pcmcia_socket *skt = to_soc_pcmcia_socket(sock);
+
+	skt->status = soc_common_pcmcia_skt_state(skt);
+	*status = skt->status;
+
+	return 0;
+}
+
+
+/*
+ * Implements the set_socket() operation for the in-kernel PCMCIA
+ * service (formerly SS_SetSocket in Card Services). We more or
+ * less punt all of this work and let the kernel handle the details
+ * of power configuration, reset, &c. We also record the value of
+ * `state' in order to regurgitate it to the PCMCIA core later.
+ */
+static int soc_common_pcmcia_set_socket(
+	struct pcmcia_socket *sock, socket_state_t *state)
+{
+	struct soc_pcmcia_socket *skt = to_soc_pcmcia_socket(sock);
+
+	debug(skt, 2, "mask: %s%s%s%s%s%s flags: %s%s%s%s%s%s Vcc %d Vpp %d irq %d\n",
+			(state->csc_mask == 0)		? "<NONE> " :	"",
+			(state->csc_mask & SS_DETECT)	? "DETECT " :	"",
+			(state->csc_mask & SS_READY)	? "READY " :	"",
+			(state->csc_mask & SS_BATDEAD)	? "BATDEAD " :	"",
+			(state->csc_mask & SS_BATWARN)	? "BATWARN " :	"",
+			(state->csc_mask & SS_STSCHG)	? "STSCHG " :	"",
+			(state->flags == 0)		? "<NONE> " :	"",
+			(state->flags & SS_PWR_AUTO)	? "PWR_AUTO " :	"",
+			(state->flags & SS_IOCARD)	? "IOCARD " :	"",
+			(state->flags & SS_RESET)	? "RESET " :	"",
+			(state->flags & SS_SPKR_ENA)	? "SPKR_ENA " :	"",
+			(state->flags & SS_OUTPUT_ENA)	? "OUTPUT_ENA " : "",
+			state->Vcc, state->Vpp, state->io_irq);
+
+	return soc_common_pcmcia_config_skt(skt, state);
+}
+
+
+/*
+ * Implements the set_io_map() operation for the in-kernel PCMCIA
+ * service (formerly SS_SetIOMap in Card Services). We configure
+ * the map speed as requested, but override the address ranges
+ * supplied by Card Services.
+ *
+ * Returns: 0 on success, -1 on error
+ */
+static int soc_common_pcmcia_set_io_map(
+	struct pcmcia_socket *sock, struct pccard_io_map *map)
+{
+	struct soc_pcmcia_socket *skt = to_soc_pcmcia_socket(sock);
+	unsigned short speed = map->speed;
+
+	debug(skt, 2, "map %u  speed %u start 0x%08llx stop 0x%08llx\n",
+		map->map, map->speed, (unsigned long long)map->start,
+		(unsigned long long)map->stop);
+	debug(skt, 2, "flags: %s%s%s%s%s%s%s%s\n",
+		(map->flags == 0)		? "<NONE>"	: "",
+		(map->flags & MAP_ACTIVE)	? "ACTIVE "	: "",
+		(map->flags & MAP_16BIT)	? "16BIT "	: "",
+		(map->flags & MAP_AUTOSZ)	? "AUTOSZ "	: "",
+		(map->flags & MAP_0WS)		? "0WS "	: "",
+		(map->flags & MAP_WRPROT)	? "WRPROT "	: "",
+		(map->flags & MAP_USE_WAIT)	? "USE_WAIT "	: "",
+		(map->flags & MAP_PREFETCH)	? "PREFETCH "	: "");
+
+	if (map->map >= MAX_IO_WIN) {
+		printk(KERN_ERR "%s(): map (%d) out of range\n", __func__,
+		       map->map);
+		return -1;
+	}
+
+	if (map->flags & MAP_ACTIVE) {
+		if (speed == 0)
+			speed = SOC_PCMCIA_IO_ACCESS;
+	} else {
+		speed = 0;
+	}
+
+	skt->spd_io[map->map] = speed;
+	skt->ops->set_timing(skt);
+
+	if (map->stop == 1)
+		map->stop = PAGE_SIZE-1;
+
+	map->stop -= map->start;
+	map->stop += skt->socket.io_offset;
+	map->start = skt->socket.io_offset;
+
+	return 0;
+}
+
+
+/*
+ * Implements the set_mem_map() operation for the in-kernel PCMCIA
+ * service (formerly SS_SetMemMap in Card Services). We configure
+ * the map speed as requested, but override the address ranges
+ * supplied by Card Services.
+ *
+ * Returns: 0 on success, -ERRNO on error
+ */
+static int soc_common_pcmcia_set_mem_map(
+	struct pcmcia_socket *sock, struct pccard_mem_map *map)
+{
+	struct soc_pcmcia_socket *skt = to_soc_pcmcia_socket(sock);
+	struct resource *res;
+	unsigned short speed = map->speed;
+
+	debug(skt, 2, "map %u speed %u card_start %08x\n",
+		map->map, map->speed, map->card_start);
+	debug(skt, 2, "flags: %s%s%s%s%s%s%s%s\n",
+		(map->flags == 0)		? "<NONE>"	: "",
+		(map->flags & MAP_ACTIVE)	? "ACTIVE "	: "",
+		(map->flags & MAP_16BIT)	? "16BIT "	: "",
+		(map->flags & MAP_AUTOSZ)	? "AUTOSZ "	: "",
+		(map->flags & MAP_0WS)		? "0WS "	: "",
+		(map->flags & MAP_WRPROT)	? "WRPROT "	: "",
+		(map->flags & MAP_ATTRIB)	? "ATTRIB "	: "",
+		(map->flags & MAP_USE_WAIT)	? "USE_WAIT "	: "");
+
+	if (map->map >= MAX_WIN)
+		return -EINVAL;
+
+	if (map->flags & MAP_ACTIVE) {
+		if (speed == 0)
+			speed = 300;
+	} else {
+		speed = 0;
+	}
+
+	if (map->flags & MAP_ATTRIB) {
+		res = &skt->res_attr;
+		skt->spd_attr[map->map] = speed;
+		skt->spd_mem[map->map] = 0;
+	} else {
+		res = &skt->res_mem;
+		skt->spd_attr[map->map] = 0;
+		skt->spd_mem[map->map] = speed;
+	}
+
+	skt->ops->set_timing(skt);
+
+	map->static_start = res->start + map->card_start;
+
+	return 0;
+}
+
+struct bittbl {
+	unsigned int mask;
+	const char *name;
+};
+
+static struct bittbl status_bits[] = {
+	{ SS_WRPROT,		"SS_WRPROT"	},
+	{ SS_BATDEAD,		"SS_BATDEAD"	},
+	{ SS_BATWARN,		"SS_BATWARN"	},
+	{ SS_READY,		"SS_READY"	},
+	{ SS_DETECT,		"SS_DETECT"	},
+	{ SS_POWERON,		"SS_POWERON"	},
+	{ SS_STSCHG,		"SS_STSCHG"	},
+	{ SS_3VCARD,		"SS_3VCARD"	},
+	{ SS_XVCARD,		"SS_XVCARD"	},
+};
+
+static struct bittbl conf_bits[] = {
+	{ SS_PWR_AUTO,		"SS_PWR_AUTO"	},
+	{ SS_IOCARD,		"SS_IOCARD"	},
+	{ SS_RESET,		"SS_RESET"	},
+	{ SS_DMA_MODE,		"SS_DMA_MODE"	},
+	{ SS_SPKR_ENA,		"SS_SPKR_ENA"	},
+	{ SS_OUTPUT_ENA,	"SS_OUTPUT_ENA"	},
+};
+
+static void dump_bits(char **p, const char *prefix,
+	unsigned int val, struct bittbl *bits, int sz)
+{
+	char *b = *p;
+	int i;
+
+	b += sprintf(b, "%-9s:", prefix);
+	for (i = 0; i < sz; i++)
+		if (val & bits[i].mask)
+			b += sprintf(b, " %s", bits[i].name);
+	*b++ = '\n';
+	*p = b;
+}
+
+/*
+ * Implements the /sys/class/pcmcia_socket/??/status file.
+ *
+ * Returns: the number of characters added to the buffer
+ */
+static ssize_t show_status(
+	struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct soc_pcmcia_socket *skt =
+		container_of(dev, struct soc_pcmcia_socket, socket.dev);
+	char *p = buf;
+
+	p += sprintf(p, "slot     : %d\n", skt->nr);
+
+	dump_bits(&p, "status", skt->status,
+		  status_bits, ARRAY_SIZE(status_bits));
+	dump_bits(&p, "csc_mask", skt->cs_state.csc_mask,
+		  status_bits, ARRAY_SIZE(status_bits));
+	dump_bits(&p, "cs_flags", skt->cs_state.flags,
+		  conf_bits, ARRAY_SIZE(conf_bits));
+
+	p += sprintf(p, "Vcc      : %d\n", skt->cs_state.Vcc);
+	p += sprintf(p, "Vpp      : %d\n", skt->cs_state.Vpp);
+	p += sprintf(p, "IRQ      : %d (%d)\n", skt->cs_state.io_irq,
+		skt->socket.pci_irq);
+	if (skt->ops->show_timing)
+		p += skt->ops->show_timing(skt, p);
+
+	return p-buf;
+}
+static DEVICE_ATTR(status, S_IRUGO, show_status, NULL);
+
+
+static struct pccard_operations soc_common_pcmcia_operations = {
+	.init			= soc_common_pcmcia_sock_init,
+	.suspend		= soc_common_pcmcia_suspend,
+	.get_status		= soc_common_pcmcia_get_status,
+	.set_socket		= soc_common_pcmcia_set_socket,
+	.set_io_map		= soc_common_pcmcia_set_io_map,
+	.set_mem_map		= soc_common_pcmcia_set_mem_map,
+};
+
+
+static LIST_HEAD(soc_pcmcia_sockets);
+static DEFINE_MUTEX(soc_pcmcia_sockets_lock);
+
+#ifdef CONFIG_CPU_FREQ
+static int
+soc_pcmcia_notifier(struct notifier_block *nb, unsigned long val, void *data)
+{
+	struct soc_pcmcia_socket *skt;
+	struct cpufreq_freqs *freqs = data;
+	int ret = 0;
+
+	mutex_lock(&soc_pcmcia_sockets_lock);
+	list_for_each_entry(skt, &soc_pcmcia_sockets, node)
+		if (skt->ops->frequency_change)
+			ret += skt->ops->frequency_change(skt, val, freqs);
+	mutex_unlock(&soc_pcmcia_sockets_lock);
+
+	return ret;
+}
+
+static struct notifier_block soc_pcmcia_notifier_block = {
+	.notifier_call	= soc_pcmcia_notifier
+};
+
+static int soc_pcmcia_cpufreq_register(void)
+{
+	int ret;
+
+	ret = cpufreq_register_notifier(&soc_pcmcia_notifier_block,
+					CPUFREQ_TRANSITION_NOTIFIER);
+	if (ret < 0)
+		printk(KERN_ERR "Unable to register CPU frequency change "
+				"notifier for PCMCIA (%d)\n", ret);
+	return ret;
+}
+fs_initcall(soc_pcmcia_cpufreq_register);
+
+static void soc_pcmcia_cpufreq_unregister(void)
+{
+	cpufreq_unregister_notifier(&soc_pcmcia_notifier_block,
+		CPUFREQ_TRANSITION_NOTIFIER);
+}
+module_exit(soc_pcmcia_cpufreq_unregister);
+
+#endif
+
+void soc_pcmcia_init_one(struct soc_pcmcia_socket *skt,
+	struct pcmcia_low_level *ops, struct device *dev)
+{
+	int i;
+
+	skt->ops = ops;
+	skt->socket.owner = ops->owner;
+	skt->socket.dev.parent = dev;
+	skt->socket.pci_irq = NO_IRQ;
+
+	for (i = 0; i < ARRAY_SIZE(skt->stat); i++)
+		skt->stat[i].gpio = -EINVAL;
+}
+EXPORT_SYMBOL(soc_pcmcia_init_one);
+
+void soc_pcmcia_remove_one(struct soc_pcmcia_socket *skt)
+{
+	mutex_lock(&soc_pcmcia_sockets_lock);
+	del_timer_sync(&skt->poll_timer);
+
+	pcmcia_unregister_socket(&skt->socket);
+
+	soc_pcmcia_hw_shutdown(skt);
+
+	/* should not be required; violates some lowlevel drivers */
+	soc_common_pcmcia_config_skt(skt, &dead_socket);
+
+	list_del(&skt->node);
+	mutex_unlock(&soc_pcmcia_sockets_lock);
+
+	iounmap(skt->virt_io);
+	skt->virt_io = NULL;
+	release_resource(&skt->res_attr);
+	release_resource(&skt->res_mem);
+	release_resource(&skt->res_io);
+	release_resource(&skt->res_skt);
+}
+EXPORT_SYMBOL(soc_pcmcia_remove_one);
+
+int soc_pcmcia_add_one(struct soc_pcmcia_socket *skt)
+{
+	int ret;
+
+	setup_timer(&skt->poll_timer, soc_common_pcmcia_poll_event,
+		    (unsigned long)skt);
+	skt->poll_timer.expires = jiffies + SOC_PCMCIA_POLL_PERIOD;
+
+	ret = request_resource(&iomem_resource, &skt->res_skt);
+	if (ret)
+		goto out_err_1;
+
+	ret = request_resource(&skt->res_skt, &skt->res_io);
+	if (ret)
+		goto out_err_2;
+
+	ret = request_resource(&skt->res_skt, &skt->res_mem);
+	if (ret)
+		goto out_err_3;
+
+	ret = request_resource(&skt->res_skt, &skt->res_attr);
+	if (ret)
+		goto out_err_4;
+
+	skt->virt_io = ioremap(skt->res_io.start, 0x10000);
+	if (skt->virt_io == NULL) {
+		ret = -ENOMEM;
+		goto out_err_5;
+	}
+
+	mutex_lock(&soc_pcmcia_sockets_lock);
+
+	list_add(&skt->node, &soc_pcmcia_sockets);
+
+	/*
+	 * We initialize default socket timing here, because
+	 * we are not guaranteed to see a SetIOMap operation at
+	 * runtime.
+	 */
+	skt->ops->set_timing(skt);
+
+	ret = soc_pcmcia_hw_init(skt);
+	if (ret)
+		goto out_err_6;
+
+	skt->socket.ops = &soc_common_pcmcia_operations;
+	skt->socket.features = SS_CAP_STATIC_MAP|SS_CAP_PCCARD;
+	skt->socket.resource_ops = &pccard_static_ops;
+	skt->socket.irq_mask = 0;
+	skt->socket.map_size = PAGE_SIZE;
+	skt->socket.io_offset = (unsigned long)skt->virt_io;
+
+	skt->status = soc_common_pcmcia_skt_state(skt);
+
+	ret = pcmcia_register_socket(&skt->socket);
+	if (ret)
+		goto out_err_7;
+
+	add_timer(&skt->poll_timer);
+
+	mutex_unlock(&soc_pcmcia_sockets_lock);
+
+	ret = device_create_file(&skt->socket.dev, &dev_attr_status);
+	if (ret)
+		goto out_err_8;
+
+	return ret;
+
+ out_err_8:
+	mutex_lock(&soc_pcmcia_sockets_lock);
+	del_timer_sync(&skt->poll_timer);
+	pcmcia_unregister_socket(&skt->socket);
+
+ out_err_7:
+	soc_pcmcia_hw_shutdown(skt);
+ out_err_6:
+	list_del(&skt->node);
+	mutex_unlock(&soc_pcmcia_sockets_lock);
+	iounmap(skt->virt_io);
+ out_err_5:
+	release_resource(&skt->res_attr);
+ out_err_4:
+	release_resource(&skt->res_mem);
+ out_err_3:
+	release_resource(&skt->res_io);
+ out_err_2:
+	release_resource(&skt->res_skt);
+ out_err_1:
+
+	return ret;
+}
+EXPORT_SYMBOL(soc_pcmcia_add_one);
+
+MODULE_AUTHOR("John Dorsey <john+@cs.cmu.edu>");
+MODULE_DESCRIPTION("Linux PCMCIA Card Services: Common SoC support");
+MODULE_LICENSE("Dual MPL/GPL");