[ARM] 5473/1: U300 core machine support

This adds core support for the ST-Ericsson U300 series
platforms: U300, U330, U335 and U365. Supports memory
mappings, interrupt controller, system timer (clocksource
and clockevents), and binds to the existing drivers for
the PrimeCells used in this design: PL190 (VIC), PL180
(MMC/SD host) and PL011 (UART). This is intented to serve
as starting point for our mainling work, more patches to
follow.

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 216 insertions, 0 deletions

diff --git a/arch/arm/mach-u300/mmc.c b/arch/arm/mach-u300/mmc.c
new file mode 100644
index 00000000000..3138d3955c9
--- /dev/null
+++ b/arch/arm/mach-u300/mmc.c
@@ -0,0 +1,216 @@
+/*
+ *
+ * arch/arm/mach-u300/mmc.c
+ *
+ *
+ * Copyright (C) 2009 ST-Ericsson AB
+ * License terms: GNU General Public License (GPL) version 2
+ *
+ * Author: Linus Walleij <linus.walleij@stericsson.com>
+ * Author: Johan Lundin <johan.lundin@stericsson.com>
+ * Author: Jonas Aaberg <jonas.aberg@stericsson.com>
+ */
+#include <linux/device.h>
+#include <linux/amba/bus.h>
+#include <linux/mmc/host.h>
+#include <linux/input.h>
+#include <linux/workqueue.h>
+#include <linux/delay.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/machine.h>
+#include <linux/gpio.h>
+
+#include <asm/mach/mmc.h>
+#include "mmc.h"
+
+struct mmci_card_event {
+	struct input_dev *mmc_input;
+	int mmc_inserted;
+	struct work_struct workq;
+	struct mmc_platform_data mmc0_plat_data;
+};
+
+static unsigned int mmc_status(struct device *dev)
+{
+	struct mmci_card_event *mmci_card = container_of(
+		dev->platform_data,
+		struct mmci_card_event, mmc0_plat_data);
+
+	return mmci_card->mmc_inserted;
+}
+
+/*
+ * Here follows a large chunk of code which will only be enabled if you
+ * have both the AB3100 chip mounted and the MMC subsystem activated.
+ */
+
+static u32 mmc_translate_vdd(struct device *dev, unsigned int voltage)
+{
+	int v;
+
+	/*
+	 * MMC Spec:
+	 * bit 7:	1.70 - 1.95V
+	 * bit 8 - 14:	2.0 - 2.6V
+	 * bit 15 - 23:	2.7 - 3.6V
+	 *
+	 * ab3100 voltages:
+	 * 000 - 2.85V
+	 * 001 - 2.75V
+	 * 010 - 1.8V
+	 * 011 - 1.5V
+	 */
+	switch (voltage) {
+	case 8:
+		v = 3;
+		break;
+	case 9:
+	case 10:
+	case 11:
+	case 12:
+	case 13:
+	case 14:
+	case 15:
+		v = 1;
+		break;
+	case 16:
+		v = 1;
+		break;
+	case 17:
+	case 18:
+	case 19:
+	case 20:
+	case 21:
+	case 22:
+	case 23:
+	case 24:
+		v = 0;
+		break;
+	default:
+		v = 0;
+		break;
+	}
+
+	/* PL180 voltage register bits */
+	return v << 2;
+}
+
+
+
+static int mmci_callback(void *data)
+{
+	struct mmci_card_event *mmci_card = data;
+
+	disable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD);
+	schedule_work(&mmci_card->workq);
+
+	return 0;
+}
+
+
+static ssize_t gpio_show(struct device *dev, struct device_attribute *attr,
+		  char *buf)
+{
+	struct mmci_card_event *mmci_card = container_of(
+		dev->platform_data,
+		struct mmci_card_event, mmc0_plat_data);
+
+
+	return sprintf(buf, "%d\n", !mmci_card->mmc_inserted);
+}
+
+static DEVICE_ATTR(mmc_inserted, S_IRUGO, gpio_show, NULL);
+
+static void _mmci_callback(struct work_struct *ws)
+{
+
+	struct mmci_card_event *mmci_card = container_of(
+		ws,
+		struct mmci_card_event, workq);
+
+	mdelay(20);
+
+	mmci_card->mmc_inserted = !!gpio_get_value(U300_GPIO_PIN_MMC_CD);
+
+	input_report_switch(mmci_card->mmc_input, KEY_INSERT,
+			    !mmci_card->mmc_inserted);
+	input_sync(mmci_card->mmc_input);
+
+	pr_debug("MMC/SD card was %s\n",
+		 mmci_card->mmc_inserted ? "removed" : "inserted");
+
+	enable_irq_on_gpio_pin(U300_GPIO_PIN_MMC_CD, !mmci_card->mmc_inserted);
+}
+
+int __devinit mmc_init(struct amba_device *adev)
+{
+	struct mmci_card_event *mmci_card;
+	struct device *mmcsd_device = &adev->dev;
+	int ret = 0;
+
+	mmci_card = kzalloc(sizeof(struct mmci_card_event), GFP_KERNEL);
+	if (!mmci_card)
+		return -ENOMEM;
+
+	/* Nominally 2.85V on our platform */
+	mmci_card->mmc0_plat_data.ocr_mask = MMC_VDD_28_29;
+	mmci_card->mmc0_plat_data.translate_vdd = mmc_translate_vdd;
+	mmci_card->mmc0_plat_data.status = mmc_status;
+
+	mmcsd_device->platform_data = (void *) &mmci_card->mmc0_plat_data;
+
+	INIT_WORK(&mmci_card->workq, _mmci_callback);
+
+	ret = gpio_request(U300_GPIO_PIN_MMC_CD, "MMC card detection");
+	if (ret) {
+		printk(KERN_CRIT "Could not allocate MMC card detection " \
+		       "GPIO pin\n");
+		goto out;
+	}
+
+	ret = gpio_direction_input(U300_GPIO_PIN_MMC_CD);
+	if (ret) {
+		printk(KERN_CRIT "Invalid GPIO pin requested\n");
+		goto out;
+	}
+
+	ret = sysfs_create_file(&mmcsd_device->kobj,
+			       &dev_attr_mmc_inserted.attr);
+	if (ret)
+		goto out;
+
+	mmci_card->mmc_input = input_allocate_device();
+	if (!mmci_card->mmc_input) {
+		printk(KERN_CRIT "Could not allocate MMC input device\n");
+		return -ENOMEM;
+	}
+
+	mmci_card->mmc_input->name = "MMC insert notification";
+	mmci_card->mmc_input->id.bustype = BUS_HOST;
+	mmci_card->mmc_input->id.vendor = 0;
+	mmci_card->mmc_input->id.product = 0;
+	mmci_card->mmc_input->id.version = 0x0100;
+	mmci_card->mmc_input->dev.parent = mmcsd_device;
+	input_set_capability(mmci_card->mmc_input, EV_SW, KEY_INSERT);
+
+	/*
+	 * Since this must always be compiled into the kernel, this input
+	 * is never unregistered or free:ed.
+	 */
+	ret = input_register_device(mmci_card->mmc_input);
+	if (ret) {
+		input_free_device(mmci_card->mmc_input);
+		goto out;
+	}
+
+	input_set_drvdata(mmci_card->mmc_input, mmci_card);
+
+	ret = gpio_register_callback(U300_GPIO_PIN_MMC_CD, mmci_callback,
+				     mmci_card);
+
+	schedule_work(&mmci_card->workq);
+
+	printk(KERN_INFO "Registered MMC insert/remove notification\n");
+out:
+	return ret;
+}