From: Tony Lindgren <tony@atomide.com>
Date: Fri, 26 Feb 2010 15:31:12 -0800
Subject: [PATCH] omap2: Initialize Menelaus and MMC for N8X0

Initialize MMC for N8X0

Based on an earlier patches from Nokia released kernel
sources at:

http://repository.maemo.org/pool/os2008/free/source/k/kernel-source-rx-34/

Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/arch/arm/mach-omap2/board-n8x0.c b/arch/arm/mach-omap2/board-n8x0.c
index 9de03f8..4cab052 100644
--- a/arch/arm/mach-omap2/board-n8x0.c
+++ b/arch/arm/mach-omap2/board-n8x0.c
@@ -17,6 +17,7 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/stddef.h>
+#include <linux/i2c.h>
 #include <linux/spi/spi.h>
 #include <linux/usb/musb.h>
 
@@ -25,11 +26,17 @@
 
 #include <plat/board.h>
 #include <plat/common.h>
+#include <plat/menelaus.h>
 #include <mach/irqs.h>
 #include <plat/mcspi.h>
 #include <plat/onenand.h>
+#include <plat/mmc.h>
 #include <plat/serial.h>
 
+static int slot1_cover_open;
+static int slot2_cover_open;
+static struct device *mmc_device;
+
 static struct omap2_mcspi_device_config p54spi_mcspi_config = {
 	.turbo_mode	= 0,
 	.single_channel = 1,
@@ -96,6 +103,442 @@ static void __init n8x0_onenand_init(void) {}
 
 #endif
 
+#if defined(CONFIG_MENELAUS) &&						\
+	(defined(CONFIG_MMC_OMAP) || defined(CONFIG_MMC_OMAP_MODULE))
+
+/*
+ * On both N800 and N810, only the first of the two MMC controllers is in use.
+ * The two MMC slots are multiplexed via Menelaus companion chip over I2C.
+ * On N800, both slots are powered via Menelaus. On N810, only one of the
+ * slots is powered via Menelaus. The N810 EMMC is powered via GPIO.
+ *
+ * VMMC				slot 1 on both N800 and N810
+ * VDCDC3_APE and VMCS2_APE	slot 2 on N800
+ * GPIO23 and GPIO9		slot 2 EMMC on N810
+ *
+ */
+#define N8X0_SLOT_SWITCH_GPIO	96
+#define N810_EMMC_VSD_GPIO	23
+#define NN810_EMMC_VIO_GPIO	9
+
+static int n8x0_mmc_switch_slot(struct device *dev, int slot)
+{
+#ifdef CONFIG_MMC_DEBUG
+	dev_dbg(dev, "Choose slot %d\n", slot + 1);
+#endif
+	gpio_set_value(N8X0_SLOT_SWITCH_GPIO, slot);
+	return 0;
+}
+
+static int n8x0_mmc_set_power_menelaus(struct device *dev, int slot,
+					int power_on, int vdd)
+{
+	int mV;
+
+#ifdef CONFIG_MMC_DEBUG
+	dev_dbg(dev, "Set slot %d power: %s (vdd %d)\n", slot + 1,
+		power_on ? "on" : "off", vdd);
+#endif
+	if (slot == 0) {
+		if (!power_on)
+			return menelaus_set_vmmc(0);
+		switch (1 << vdd) {
+		case MMC_VDD_33_34:
+		case MMC_VDD_32_33:
+		case MMC_VDD_31_32:
+			mV = 3100;
+			break;
+		case MMC_VDD_30_31:
+			mV = 3000;
+			break;
+		case MMC_VDD_28_29:
+			mV = 2800;
+			break;
+		case MMC_VDD_165_195:
+			mV = 1850;
+			break;
+		default:
+			BUG();
+		}
+		return menelaus_set_vmmc(mV);
+	} else {
+		if (!power_on)
+			return menelaus_set_vdcdc(3, 0);
+		switch (1 << vdd) {
+		case MMC_VDD_33_34:
+		case MMC_VDD_32_33:
+			mV = 3300;
+			break;
+		case MMC_VDD_30_31:
+		case MMC_VDD_29_30:
+			mV = 3000;
+			break;
+		case MMC_VDD_28_29:
+		case MMC_VDD_27_28:
+			mV = 2800;
+			break;
+		case MMC_VDD_24_25:
+		case MMC_VDD_23_24:
+			mV = 2400;
+			break;
+		case MMC_VDD_22_23:
+		case MMC_VDD_21_22:
+			mV = 2200;
+			break;
+		case MMC_VDD_20_21:
+			mV = 2000;
+			break;
+		case MMC_VDD_165_195:
+			mV = 1800;
+			break;
+		default:
+			BUG();
+		}
+		return menelaus_set_vdcdc(3, mV);
+	}
+	return 0;
+}
+
+static void n810_set_power_emmc(struct device *dev,
+					 int power_on)
+{
+	dev_dbg(dev, "Set EMMC power %s\n", power_on ? "on" : "off");
+
+	if (power_on) {
+		gpio_set_value(N810_EMMC_VSD_GPIO, 1);
+		msleep(1);
+		gpio_set_value(NN810_EMMC_VIO_GPIO, 1);
+		msleep(1);
+	} else {
+		gpio_set_value(NN810_EMMC_VIO_GPIO, 0);
+		msleep(50);
+		gpio_set_value(N810_EMMC_VSD_GPIO, 0);
+		msleep(50);
+	}
+}
+
+static int n8x0_mmc_set_power(struct device *dev, int slot, int power_on,
+			      int vdd)
+{
+	if (machine_is_nokia_n800() || slot == 0)
+		return n8x0_mmc_set_power_menelaus(dev, slot, power_on, vdd);
+
+	n810_set_power_emmc(dev, power_on);
+
+	return 0;
+}
+
+static int n8x0_mmc_set_bus_mode(struct device *dev, int slot, int bus_mode)
+{
+	int r;
+
+	dev_dbg(dev, "Set slot %d bus mode %s\n", slot + 1,
+		bus_mode == MMC_BUSMODE_OPENDRAIN ? "open-drain" : "push-pull");
+	BUG_ON(slot != 0 && slot != 1);
+	slot++;
+	switch (bus_mode) {
+	case MMC_BUSMODE_OPENDRAIN:
+		r = menelaus_set_mmc_opendrain(slot, 1);
+		break;
+	case MMC_BUSMODE_PUSHPULL:
+		r = menelaus_set_mmc_opendrain(slot, 0);
+		break;
+	default:
+		BUG();
+	}
+	if (r != 0 && printk_ratelimit())
+		dev_err(dev, "MMC: unable to set bus mode for slot %d\n",
+			slot);
+	return r;
+}
+
+static int n8x0_mmc_get_cover_state(struct device *dev, int slot)
+{
+	slot++;
+	BUG_ON(slot != 1 && slot != 2);
+	if (slot == 1)
+		return slot1_cover_open;
+	else
+		return slot2_cover_open;
+}
+
+static void n8x0_mmc_callback(void *data, u8 card_mask)
+{
+	int bit, *openp, index;
+
+	if (machine_is_nokia_n800()) {
+		bit = 1 << 1;
+		openp = &slot2_cover_open;
+		index = 1;
+	} else {
+		bit = 1;
+		openp = &slot1_cover_open;
+		index = 0;
+	}
+
+	if (card_mask & bit)
+		*openp = 1;
+	else
+		*openp = 0;
+
+	omap_mmc_notify_cover_event(mmc_device, index, *openp);
+}
+
+void n8x0_mmc_slot1_cover_handler(void *arg, int closed_state)
+{
+	if (mmc_device == NULL)
+		return;
+
+	slot1_cover_open = !closed_state;
+	omap_mmc_notify_cover_event(mmc_device, 0, closed_state);
+}
+
+static int n8x0_mmc_late_init(struct device *dev)
+{
+	int r, bit, *openp;
+	int vs2sel;
+
+	mmc_device = dev;
+
+	r = menelaus_set_slot_sel(1);
+	if (r < 0)
+		return r;
+
+	if (machine_is_nokia_n800())
+		vs2sel = 0;
+	else
+		vs2sel = 2;
+
+	r = menelaus_set_mmc_slot(2, 0, vs2sel, 1);
+	if (r < 0)
+		return r;
+
+	n8x0_mmc_set_power(dev, 0, MMC_POWER_ON, 16); /* MMC_VDD_28_29 */
+	n8x0_mmc_set_power(dev, 1, MMC_POWER_ON, 16);
+
+	r = menelaus_set_mmc_slot(1, 1, 0, 1);
+	if (r < 0)
+		return r;
+	r = menelaus_set_mmc_slot(2, 1, vs2sel, 1);
+	if (r < 0)
+		return r;
+
+	r = menelaus_get_slot_pin_states();
+	if (r < 0)
+		return r;
+
+	if (machine_is_nokia_n800()) {
+		bit = 1 << 1;
+		openp = &slot2_cover_open;
+	} else {
+		bit = 1;
+		openp = &slot1_cover_open;
+		slot2_cover_open = 0;
+	}
+
+	/* All slot pin bits seem to be inversed until first switch change */
+	if (r == 0xf || r == (0xf & ~bit))
+		r = ~r;
+
+	if (r & bit)
+		*openp = 1;
+	else
+		*openp = 0;
+
+	r = menelaus_register_mmc_callback(n8x0_mmc_callback, NULL);
+
+	return r;
+}
+
+static void n8x0_mmc_shutdown(struct device *dev)
+{
+	int vs2sel;
+
+	if (machine_is_nokia_n800())
+		vs2sel = 0;
+	else
+		vs2sel = 2;
+
+	menelaus_set_mmc_slot(1, 0, 0, 0);
+	menelaus_set_mmc_slot(2, 0, vs2sel, 0);
+}
+
+static void n8x0_mmc_cleanup(struct device *dev)
+{
+	menelaus_unregister_mmc_callback();
+
+	gpio_free(N8X0_SLOT_SWITCH_GPIO);
+
+	if (machine_is_nokia_n810()) {
+		gpio_free(N810_EMMC_VSD_GPIO);
+		gpio_free(NN810_EMMC_VIO_GPIO);
+	}
+}
+
+/*
+ * MMC controller1 has two slots that are multiplexed via I2C.
+ * MMC controller2 is not in use.
+ */
+static struct omap_mmc_platform_data mmc1_data = {
+	.nr_slots			= 2,
+	.switch_slot			= n8x0_mmc_switch_slot,
+	.init				= n8x0_mmc_late_init,
+	.cleanup			= n8x0_mmc_cleanup,
+	.shutdown			= n8x0_mmc_shutdown,
+	.max_freq			= 24000000,
+	.dma_mask			= 0xffffffff,
+	.slots[0] = {
+		.wires			= 4,
+		.set_power		= n8x0_mmc_set_power,
+		.set_bus_mode		= n8x0_mmc_set_bus_mode,
+		.get_cover_state	= n8x0_mmc_get_cover_state,
+		.ocr_mask		= MMC_VDD_165_195 | MMC_VDD_30_31 |
+						MMC_VDD_32_33   | MMC_VDD_33_34,
+		.name			= "internal",
+	},
+	.slots[1] = {
+		.set_power		= n8x0_mmc_set_power,
+		.set_bus_mode		= n8x0_mmc_set_bus_mode,
+		.get_cover_state	= n8x0_mmc_get_cover_state,
+		.ocr_mask		= MMC_VDD_165_195 | MMC_VDD_20_21 |
+						MMC_VDD_21_22 | MMC_VDD_22_23 |
+						MMC_VDD_23_24 | MMC_VDD_24_25 |
+						MMC_VDD_27_28 | MMC_VDD_28_29 |
+						MMC_VDD_29_30 | MMC_VDD_30_31 |
+						MMC_VDD_32_33 | MMC_VDD_33_34,
+		.name			= "external",
+	},
+};
+
+static struct omap_mmc_platform_data *mmc_data[OMAP24XX_NR_MMC];
+
+void __init n8x0_mmc_init(void)
+
+{
+	int err;
+
+	if (machine_is_nokia_n810()) {
+		mmc1_data.slots[0].name = "external";
+
+		/*
+		 * Some Samsung Movinand chips do not like open-ended
+		 * multi-block reads and fall to braind-dead state
+		 * while doing so. Reducing the number of blocks in
+		 * the transfer or delays in clock disable do not help
+		 */
+		mmc1_data.slots[1].name = "internal";
+		mmc1_data.slots[1].ban_openended = 1;
+	}
+
+	err = gpio_request(N8X0_SLOT_SWITCH_GPIO, "MMC slot switch");
+	if (err)
+		return err;
+
+	gpio_direction_output(N8X0_SLOT_SWITCH_GPIO, 0);
+
+	if (machine_is_nokia_n810()) {
+		err = gpio_request(N810_EMMC_VSD_GPIO, "MMC slot 2 Vddf");
+		if (err) {
+			gpio_free(N8X0_SLOT_SWITCH_GPIO);
+			return err;
+		}
+		gpio_direction_output(N810_EMMC_VSD_GPIO, 0);
+
+		err = gpio_request(NN810_EMMC_VIO_GPIO, "MMC slot 2 Vdd");
+		if (err) {
+			gpio_free(N8X0_SLOT_SWITCH_GPIO);
+			gpio_free(N810_EMMC_VSD_GPIO);
+			return err;
+		}
+		gpio_direction_output(NN810_EMMC_VIO_GPIO, 0);
+	}
+
+	mmc_data[0] = &mmc1_data;
+	omap2_init_mmc(mmc_data, OMAP24XX_NR_MMC);
+}
+#else
+
+void __init n8x0_mmc_init(void)
+{
+}
+
+void n8x0_mmc_slot1_cover_handler(void *arg, int state)
+{
+}
+
+#endif	/* CONFIG_MMC_OMAP */
+
+#ifdef CONFIG_MENELAUS
+
+static int n8x0_auto_sleep_regulators(void)
+{
+	u32 val;
+	int ret;
+
+	val = EN_VPLL_SLEEP | EN_VMMC_SLEEP    \
+		| EN_VAUX_SLEEP | EN_VIO_SLEEP \
+		| EN_VMEM_SLEEP | EN_DC3_SLEEP \
+		| EN_VC_SLEEP | EN_DC2_SLEEP;
+
+	ret = menelaus_set_regulator_sleep(1, val);
+	if (ret < 0) {
+		printk(KERN_ERR "Could not set regulators to sleep on "
+			"menelaus: %u\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int n8x0_auto_voltage_scale(void)
+{
+	int ret;
+
+	ret = menelaus_set_vcore_hw(1400, 1050);
+	if (ret < 0) {
+		printk(KERN_ERR "Could not set VCORE voltage on "
+			"menelaus: %u\n", ret);
+		return ret;
+	}
+	return 0;
+}
+
+static int n8x0_menelaus_late_init(struct device *dev)
+{
+	int ret;
+
+	ret = n8x0_auto_voltage_scale();
+	if (ret < 0)
+		return ret;
+	ret = n8x0_auto_sleep_regulators();
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
+static struct i2c_board_info __initdata n8x0_i2c_board_info_1[] = {
+	{
+		I2C_BOARD_INFO("menelaus", 0x72),
+		.irq = INT_24XX_SYS_NIRQ,
+	},
+};
+
+static struct menelaus_platform_data n8x0_menelaus_platform_data = {
+	.late_init = n8x0_menelaus_late_init,
+};
+
+static void __init n8x0_menelaus_init(void)
+{
+	n8x0_i2c_board_info_1[0].platform_data = &n8x0_menelaus_platform_data;
+	omap_register_i2c_bus(1, 400, n8x0_i2c_board_info_1,
+			      ARRAY_SIZE(n8x0_i2c_board_info_1));
+}
+
+#else
+static inline void __init n8x0_menelaus_init(void)
+{
+}
+#endif
+
 static void __init n8x0_map_io(void)
 {
 	omap2_set_globals_242x();
@@ -116,7 +559,9 @@ static void __init n8x0_init_machine(void)
 				ARRAY_SIZE(n800_spi_board_info));
 
 	omap_serial_init();
+	n8x0_menelaus_init();
 	n8x0_onenand_init();
+	n8x0_mmc_init();
 }
 
 MACHINE_START(NOKIA_N800, "Nokia N800")
