1 files changed, 387 insertions, 0 deletions
diff --git a/drivers/usb/renesas_usbhs/mod.c b/drivers/usb/renesas_usbhs/mod.c
new file mode 100644
index 000000000..b98112cef
--- /dev/null
+++ b/drivers/usb/renesas_usbhs/mod.c
@@ -0,0 +1,387 @@
+// SPDX-License-Identifier: GPL-1.0+
+/*
+ * Renesas USB driver
+ *
+ * Copyright (C) 2011 Renesas Solutions Corp.
+ * Copyright (C) 2019 Renesas Electronics Corporation
+ * Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ */
+#include <linux/interrupt.h>
+
+#include "common.h"
+#include "mod.h"
+
+/*
+ *		autonomy
+ *
+ * these functions are used if platform doesn't have external phy.
+ *  -> there is no "notify_hotplug" callback from platform
+ *  -> call "notify_hotplug" by itself
+ *  -> use own interrupt to connect/disconnect
+ *  -> it mean module clock is always ON
+ *             ~~~~~~~~~~~~~~~~~~~~~~~~~
+ */
+static int usbhsm_autonomy_get_vbus(struct platform_device *pdev)
+{
+	struct usbhs_priv *priv = usbhs_pdev_to_priv(pdev);
+
+	return  VBSTS & usbhs_read(priv, INTSTS0);
+}
+
+static int usbhsm_autonomy_irq_vbus(struct usbhs_priv *priv,
+				    struct usbhs_irq_state *irq_state)
+{
+	struct platform_device *pdev = usbhs_priv_to_pdev(priv);
+
+	usbhsc_schedule_notify_hotplug(pdev);
+
+	return 0;
+}
+
+void usbhs_mod_autonomy_mode(struct usbhs_priv *priv)
+{
+	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
+
+	info->irq_vbus = usbhsm_autonomy_irq_vbus;
+	info->get_vbus = usbhsm_autonomy_get_vbus;
+
+	usbhs_irq_callback_update(priv, NULL);
+}
+
+void usbhs_mod_non_autonomy_mode(struct usbhs_priv *priv)
+{
+	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
+
+	info->get_vbus = priv->pfunc->get_vbus;
+}
+
+/*
+ *		host / gadget functions
+ *
+ * renesas_usbhs host/gadget can register itself by below functions.
+ * these functions are called when probe
+ *
+ */
+void usbhs_mod_register(struct usbhs_priv *priv, struct usbhs_mod *mod, int id)
+{
+	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
+
+	info->mod[id]	= mod;
+	mod->priv	= priv;
+}
+
+struct usbhs_mod *usbhs_mod_get(struct usbhs_priv *priv, int id)
+{
+	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
+	struct usbhs_mod *ret = NULL;
+
+	switch (id) {
+	case USBHS_HOST:
+	case USBHS_GADGET:
+		ret = info->mod[id];
+		break;
+	}
+
+	return ret;
+}
+
+int usbhs_mod_is_host(struct usbhs_priv *priv)
+{
+	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
+	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
+
+	if (!mod)
+		return -EINVAL;
+
+	return info->mod[USBHS_HOST] == mod;
+}
+
+struct usbhs_mod *usbhs_mod_get_current(struct usbhs_priv *priv)
+{
+	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
+
+	return info->curt;
+}
+
+int usbhs_mod_change(struct usbhs_priv *priv, int id)
+{
+	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
+	struct usbhs_mod *mod = NULL;
+	int ret = 0;
+
+	/* id < 0 mean no current */
+	switch (id) {
+	case USBHS_HOST:
+	case USBHS_GADGET:
+		mod = info->mod[id];
+		break;
+	default:
+		ret = -EINVAL;
+	}
+	info->curt = mod;
+
+	return ret;
+}
+
+static irqreturn_t usbhs_interrupt(int irq, void *data);
+int usbhs_mod_probe(struct usbhs_priv *priv)
+{
+	struct device *dev = usbhs_priv_to_dev(priv);
+	int ret;
+
+	/*
+	 * install host/gadget driver
+	 */
+	ret = usbhs_mod_host_probe(priv);
+	if (ret < 0)
+		return ret;
+
+	ret = usbhs_mod_gadget_probe(priv);
+	if (ret < 0)
+		goto mod_init_host_err;
+
+	/* irq settings */
+	ret = devm_request_irq(dev, priv->irq, usbhs_interrupt,
+			  priv->irqflags, dev_name(dev), priv);
+	if (ret) {
+		dev_err(dev, "irq request err\n");
+		goto mod_init_gadget_err;
+	}
+
+	return ret;
+
+mod_init_gadget_err:
+	usbhs_mod_gadget_remove(priv);
+mod_init_host_err:
+	usbhs_mod_host_remove(priv);
+
+	return ret;
+}
+
+void usbhs_mod_remove(struct usbhs_priv *priv)
+{
+	usbhs_mod_host_remove(priv);
+	usbhs_mod_gadget_remove(priv);
+}
+
+/*
+ *		status functions
+ */
+int usbhs_status_get_device_state(struct usbhs_irq_state *irq_state)
+{
+	return (int)irq_state->intsts0 & DVSQ_MASK;
+}
+
+int usbhs_status_get_ctrl_stage(struct usbhs_irq_state *irq_state)
+{
+	/*
+	 * return value
+	 *
+	 * IDLE_SETUP_STAGE
+	 * READ_DATA_STAGE
+	 * READ_STATUS_STAGE
+	 * WRITE_DATA_STAGE
+	 * WRITE_STATUS_STAGE
+	 * NODATA_STATUS_STAGE
+	 * SEQUENCE_ERROR
+	 */
+	return (int)irq_state->intsts0 & CTSQ_MASK;
+}
+
+static int usbhs_status_get_each_irq(struct usbhs_priv *priv,
+				     struct usbhs_irq_state *state)
+{
+	struct usbhs_mod *mod = usbhs_mod_get_current(priv);
+	u16 intenb0, intenb1;
+	unsigned long flags;
+
+	/********************  spin lock ********************/
+	usbhs_lock(priv, flags);
+	state->intsts0 = usbhs_read(priv, INTSTS0);
+	intenb0 = usbhs_read(priv, INTENB0);
+
+	if (usbhs_mod_is_host(priv)) {
+		state->intsts1 = usbhs_read(priv, INTSTS1);
+		intenb1 = usbhs_read(priv, INTENB1);
+	} else {
+		state->intsts1 = intenb1 = 0;
+	}
+
+	/* mask */
+	if (mod) {
+		state->brdysts = usbhs_read(priv, BRDYSTS);
+		state->nrdysts = usbhs_read(priv, NRDYSTS);
+		state->bempsts = usbhs_read(priv, BEMPSTS);
+
+		state->bempsts &= mod->irq_bempsts;
+		state->brdysts &= mod->irq_brdysts;
+	}
+	usbhs_unlock(priv, flags);
+	/********************  spin unlock ******************/
+
+	/*
+	 * Check whether the irq enable registers and the irq status are set
+	 * when IRQF_SHARED is set.
+	 */
+	if (priv->irqflags & IRQF_SHARED) {
+		if (!(intenb0 & state->intsts0) &&
+		    !(intenb1 & state->intsts1) &&
+		    !(state->bempsts) &&
+		    !(state->brdysts))
+			return -EIO;
+	}
+
+	return 0;
+}
+
+/*
+ *		interrupt
+ */
+#define INTSTS0_MAGIC 0xF800 /* acknowledge magical interrupt sources */
+#define INTSTS1_MAGIC 0xA870 /* acknowledge magical interrupt sources */
+static irqreturn_t usbhs_interrupt(int irq, void *data)
+{
+	struct usbhs_priv *priv = data;
+	struct usbhs_irq_state irq_state;
+
+	if (usbhs_status_get_each_irq(priv, &irq_state) < 0)
+		return IRQ_NONE;
+
+	/*
+	 * clear interrupt
+	 *
+	 * The hardware is _very_ picky to clear interrupt bit.
+	 * Especially INTSTS0_MAGIC, INTSTS1_MAGIC value.
+	 *
+	 * see
+	 *	"Operation"
+	 *	 - "Control Transfer (DCP)"
+	 *	   - Function :: VALID bit should 0
+	 */
+	usbhs_write(priv, INTSTS0, ~irq_state.intsts0 & INTSTS0_MAGIC);
+	if (usbhs_mod_is_host(priv))
+		usbhs_write(priv, INTSTS1, ~irq_state.intsts1 & INTSTS1_MAGIC);
+
+	/*
+	 * The driver should not clear the xxxSTS after the line of
+	 * "call irq callback functions" because each "if" statement is
+	 * possible to call the callback function for avoiding any side effects.
+	 */
+	if (irq_state.intsts0 & BRDY)
+		usbhs_write(priv, BRDYSTS, ~irq_state.brdysts);
+	usbhs_write(priv, NRDYSTS, ~irq_state.nrdysts);
+	if (irq_state.intsts0 & BEMP)
+		usbhs_write(priv, BEMPSTS, ~irq_state.bempsts);
+
+	/*
+	 * call irq callback functions
+	 * see also
+	 *	usbhs_irq_setting_update
+	 */
+
+	/* INTSTS0 */
+	if (irq_state.intsts0 & VBINT)
+		usbhs_mod_info_call(priv, irq_vbus, priv, &irq_state);
+
+	if (irq_state.intsts0 & DVST)
+		usbhs_mod_call(priv, irq_dev_state, priv, &irq_state);
+
+	if (irq_state.intsts0 & CTRT)
+		usbhs_mod_call(priv, irq_ctrl_stage, priv, &irq_state);
+
+	if (irq_state.intsts0 & BEMP)
+		usbhs_mod_call(priv, irq_empty, priv, &irq_state);
+
+	if (irq_state.intsts0 & BRDY)
+		usbhs_mod_call(priv, irq_ready, priv, &irq_state);
+
+	if (usbhs_mod_is_host(priv)) {
+		/* INTSTS1 */
+		if (irq_state.intsts1 & ATTCH)
+			usbhs_mod_call(priv, irq_attch, priv, &irq_state);
+
+		if (irq_state.intsts1 & DTCH)
+			usbhs_mod_call(priv, irq_dtch, priv, &irq_state);
+
+		if (irq_state.intsts1 & SIGN)
+			usbhs_mod_call(priv, irq_sign, priv, &irq_state);
+
+		if (irq_state.intsts1 & SACK)
+			usbhs_mod_call(priv, irq_sack, priv, &irq_state);
+	}
+	return IRQ_HANDLED;
+}
+
+void usbhs_irq_callback_update(struct usbhs_priv *priv, struct usbhs_mod *mod)
+{
+	u16 intenb0 = 0;
+	u16 intenb1 = 0;
+	struct usbhs_mod_info *info = usbhs_priv_to_modinfo(priv);
+
+	/*
+	 * BEMPENB/BRDYENB are picky.
+	 * below method is required
+	 *
+	 *  - clear  INTSTS0
+	 *  - update BEMPENB/BRDYENB
+	 *  - update INTSTS0
+	 */
+	usbhs_write(priv, INTENB0, 0);
+	if (usbhs_mod_is_host(priv))
+		usbhs_write(priv, INTENB1, 0);
+
+	usbhs_write(priv, BEMPENB, 0);
+	usbhs_write(priv, BRDYENB, 0);
+
+	/*
+	 * see also
+	 *	usbhs_interrupt
+	 */
+
+	if (info->irq_vbus)
+		intenb0 |= VBSE;
+
+	if (mod) {
+		/*
+		 * INTSTS0
+		 */
+		if (mod->irq_ctrl_stage)
+			intenb0 |= CTRE;
+
+		if (mod->irq_dev_state)
+			intenb0 |= DVSE;
+
+		if (mod->irq_empty && mod->irq_bempsts) {
+			usbhs_write(priv, BEMPENB, mod->irq_bempsts);
+			intenb0 |= BEMPE;
+		}
+
+		if (mod->irq_ready && mod->irq_brdysts) {
+			usbhs_write(priv, BRDYENB, mod->irq_brdysts);
+			intenb0 |= BRDYE;
+		}
+
+		if (usbhs_mod_is_host(priv)) {
+			/*
+			 * INTSTS1
+			 */
+			if (mod->irq_attch)
+				intenb1 |= ATTCHE;
+
+			if (mod->irq_dtch)
+				intenb1 |= DTCHE;
+
+			if (mod->irq_sign)
+				intenb1 |= SIGNE;
+
+			if (mod->irq_sack)
+				intenb1 |= SACKE;
+		}
+	}
+
+	if (intenb0)
+		usbhs_write(priv, INTENB0, intenb0);
+
+	if (usbhs_mod_is_host(priv) && intenb1)
+		usbhs_write(priv, INTENB1, intenb1);
+}