ARM: 6458/1: pcmcia: Adds nanoEngine PCMCIA support.

This patch adds nanoEngine PCMCIA support, with support for two sockets.

In order to have a fully functional pcmcia subsystem in a BSE
nanoEngine board you should carefully read this:

http://cambuca.ldhs.cetuc.puc-rio.br/nanoengine/

Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 219 insertions, 0 deletions

diff --git a/drivers/pcmcia/sa1100_nanoengine.c b/drivers/pcmcia/sa1100_nanoengine.c
new file mode 100644
index 000000000000..3d2652e2f5ae
--- /dev/null
+++ b/drivers/pcmcia/sa1100_nanoengine.c
@@ -0,0 +1,219 @@
+/*
+ * drivers/pcmcia/sa1100_nanoengine.c
+ *
+ * PCMCIA implementation routines for BSI nanoEngine.
+ *
+ * In order to have a fully functional pcmcia subsystem in a BSE nanoEngine
+ * board you should carefully read this:
+ * http://cambuca.ldhs.cetuc.puc-rio.br/nanoengine/
+ *
+ * Copyright (C) 2010 Marcelo Roberto Jimenez <mroberto@cpti.cetuc.puc-rio.br>
+ *
+ * Based on original work for kernel 2.4 by
+ * Miguel Freitas <miguel@cpti.cetuc.puc-rio.br>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/device.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/signal.h>
+
+#include <asm/mach-types.h>
+#include <asm/irq.h>
+
+#include <mach/hardware.h>
+#include <mach/nanoengine.h>
+
+#include "sa1100_generic.h"
+
+static struct pcmcia_irqs irqs_skt0[] = {
+	/* socket, IRQ, name */
+	{ 0, NANOENGINE_IRQ_GPIO_PC_CD0, "PC CD0" },
+};
+
+static struct pcmcia_irqs irqs_skt1[] = {
+	/* socket, IRQ, name */
+	{ 1, NANOENGINE_IRQ_GPIO_PC_CD1, "PC CD1" },
+};
+
+struct nanoengine_pins {
+	unsigned input_pins;
+	unsigned output_pins;
+	unsigned clear_outputs;
+	unsigned transition_pins;
+	unsigned pci_irq;
+	struct pcmcia_irqs *pcmcia_irqs;
+	unsigned pcmcia_irqs_size;
+};
+
+static struct nanoengine_pins nano_skts[] = {
+	{
+		.input_pins		= GPIO_PC_READY0 | GPIO_PC_CD0,
+		.output_pins		= GPIO_PC_RESET0,
+		.clear_outputs		= GPIO_PC_RESET0,
+		.transition_pins	= NANOENGINE_IRQ_GPIO_PC_CD0,
+		.pci_irq		= NANOENGINE_IRQ_GPIO_PC_READY0,
+		.pcmcia_irqs		= irqs_skt0,
+		.pcmcia_irqs_size	= ARRAY_SIZE(irqs_skt0)
+	}, {
+		.input_pins		= GPIO_PC_READY1 | GPIO_PC_CD1,
+		.output_pins		= GPIO_PC_RESET1,
+		.clear_outputs		= GPIO_PC_RESET1,
+		.transition_pins	= NANOENGINE_IRQ_GPIO_PC_CD1,
+		.pci_irq		= NANOENGINE_IRQ_GPIO_PC_READY1,
+		.pcmcia_irqs		= irqs_skt1,
+		.pcmcia_irqs_size	= ARRAY_SIZE(irqs_skt1)
+	}
+};
+
+unsigned num_nano_pcmcia_sockets = ARRAY_SIZE(nano_skts);
+
+static int nanoengine_pcmcia_hw_init(struct soc_pcmcia_socket *skt)
+{
+	unsigned i = skt->nr;
+
+	if (i >= num_nano_pcmcia_sockets)
+		return -ENXIO;
+
+	GPDR &= ~nano_skts[i].input_pins;
+	GPDR |= nano_skts[i].output_pins;
+	GPCR = nano_skts[i].clear_outputs;
+	set_irq_type(nano_skts[i].transition_pins, IRQ_TYPE_EDGE_BOTH);
+	skt->socket.pci_irq = nano_skts[i].pci_irq;
+
+	return soc_pcmcia_request_irqs(skt,
+		nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
+}
+
+/*
+ * Release all resources.
+ */
+static void nanoengine_pcmcia_hw_shutdown(struct soc_pcmcia_socket *skt)
+{
+	unsigned i = skt->nr;
+
+	if (i >= num_nano_pcmcia_sockets)
+		return;
+
+	soc_pcmcia_free_irqs(skt,
+		nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
+}
+
+static int nanoengine_pcmcia_configure_socket(
+	struct soc_pcmcia_socket *skt, const socket_state_t *state)
+{
+	unsigned reset;
+	unsigned i = skt->nr;
+
+	if (i >= num_nano_pcmcia_sockets)
+		return -ENXIO;
+
+	switch (i) {
+	case 0:
+		reset = GPIO_PC_RESET0;
+		break;
+	case 1:
+		reset = GPIO_PC_RESET1;
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	if (state->flags & SS_RESET)
+		GPSR = reset;
+	else
+		GPCR = reset;
+
+	return 0;
+}
+
+static void nanoengine_pcmcia_socket_state(
+	struct soc_pcmcia_socket *skt, struct pcmcia_state *state)
+{
+	unsigned long levels = GPLR;
+	unsigned i = skt->nr;
+
+	if (i >= num_nano_pcmcia_sockets)
+		return;
+
+	memset(state, 0, sizeof(struct pcmcia_state));
+	switch (i) {
+	case 0:
+		state->ready = (levels & GPIO_PC_READY0) ? 1 : 0;
+		state->detect = !(levels & GPIO_PC_CD0) ? 1 : 0;
+		break;
+	case 1:
+		state->ready = (levels & GPIO_PC_READY1) ? 1 : 0;
+		state->detect = !(levels & GPIO_PC_CD1) ? 1 : 0;
+		break;
+	default:
+		return;
+	}
+	state->bvd1 = 1;
+	state->bvd2 = 1;
+	state->wrprot = 0; /* Not available */
+	state->vs_3v = 1; /* Can only apply 3.3V */
+	state->vs_Xv = 0;
+}
+
+/*
+ * Enable card status IRQs on (re-)initialisation.  This can
+ * be called at initialisation, power management event, or
+ * pcmcia event.
+ */
+static void nanoengine_pcmcia_socket_init(struct soc_pcmcia_socket *skt)
+{
+	unsigned i = skt->nr;
+
+	if (i >= num_nano_pcmcia_sockets)
+		return;
+
+	soc_pcmcia_enable_irqs(skt,
+		nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
+}
+
+/*
+ * Disable card status IRQs on suspend.
+ */
+static void nanoengine_pcmcia_socket_suspend(struct soc_pcmcia_socket *skt)
+{
+	unsigned i = skt->nr;
+
+	if (i >= num_nano_pcmcia_sockets)
+		return;
+
+	soc_pcmcia_disable_irqs(skt,
+		nano_skts[i].pcmcia_irqs, nano_skts[i].pcmcia_irqs_size);
+}
+
+static struct pcmcia_low_level nanoengine_pcmcia_ops = {
+	.owner			= THIS_MODULE,
+
+	.hw_init		= nanoengine_pcmcia_hw_init,
+	.hw_shutdown		= nanoengine_pcmcia_hw_shutdown,
+
+	.configure_socket	= nanoengine_pcmcia_configure_socket,
+	.socket_state		= nanoengine_pcmcia_socket_state,
+	.socket_init		= nanoengine_pcmcia_socket_init,
+	.socket_suspend		= nanoengine_pcmcia_socket_suspend,
+};
+
+int pcmcia_nanoengine_init(struct device *dev)
+{
+	int ret = -ENODEV;
+
+	if (machine_is_nanoengine())
+		ret = sa11xx_drv_pcmcia_probe(
+			dev, &nanoengine_pcmcia_ops, 0, 2);
+
+	return ret;
+}
+