diff options
Diffstat (limited to 'drivers/usb/cdns3/drd.c')
| -rw-r--r-- | drivers/usb/cdns3/drd.c | 379 |
1 files changed, 0 insertions, 379 deletions
diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c deleted file mode 100644 index b06929fe1175..000000000000 --- a/drivers/usb/cdns3/drd.c +++ /dev/null @@ -1,379 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Cadence USBSS DRD Driver. - * - * Copyright (C) 2018-2019 Cadence. - * Copyright (C) 2019 Texas Instruments - * - * Author: Pawel Laszczak <pawell@cadence.com> - * Roger Quadros <rogerq@ti.com> - * - * - */ -#include <linux/kernel.h> -#include <linux/interrupt.h> -#include <linux/delay.h> -#include <linux/usb/otg.h> - -#include "gadget.h" -#include "drd.h" -#include "core.h" - -/** - * cdns3_set_mode - change mode of OTG Core - * @cdns: pointer to context structure - * @mode: selected mode from cdns_role - * - * Returns 0 on success otherwise negative errno - */ -int cdns3_set_mode(struct cdns3 *cdns, enum usb_dr_mode mode) -{ - int ret = 0; - u32 reg; - - cdns->current_dr_mode = mode; - - switch (mode) { - case USB_DR_MODE_PERIPHERAL: - break; - case USB_DR_MODE_HOST: - break; - case USB_DR_MODE_OTG: - dev_dbg(cdns->dev, "Set controller to OTG mode\n"); - if (cdns->version == CDNS3_CONTROLLER_V1) { - reg = readl(&cdns->otg_v1_regs->override); - reg |= OVERRIDE_IDPULLUP; - writel(reg, &cdns->otg_v1_regs->override); - } else { - reg = readl(&cdns->otg_v0_regs->ctrl1); - reg |= OVERRIDE_IDPULLUP_V0; - writel(reg, &cdns->otg_v0_regs->ctrl1); - } - - /* - * Hardware specification says: "ID_VALUE must be valid within - * 50ms after idpullup is set to '1" so driver must wait - * 50ms before reading this pin. - */ - usleep_range(50000, 60000); - break; - default: - cdns->current_dr_mode = USB_DR_MODE_UNKNOWN; - dev_err(cdns->dev, "Unsupported mode of operation %d\n", mode); - return -EINVAL; - } - - return ret; -} - -int cdns3_get_id(struct cdns3 *cdns) -{ - int id; - - id = readl(&cdns->otg_regs->sts) & OTGSTS_ID_VALUE; - dev_dbg(cdns->dev, "OTG ID: %d", id); - - return id; -} - -int cdns3_get_vbus(struct cdns3 *cdns) -{ - int vbus; - - vbus = !!(readl(&cdns->otg_regs->sts) & OTGSTS_VBUS_VALID); - dev_dbg(cdns->dev, "OTG VBUS: %d", vbus); - return vbus; -} - -int cdns3_is_host(struct cdns3 *cdns) -{ - if (cdns->current_dr_mode == USB_DR_MODE_HOST) - return 1; - else if (!cdns3_get_id(cdns)) - return 1; - - return 0; -} - -int cdns3_is_device(struct cdns3 *cdns) -{ - if (cdns->current_dr_mode == USB_DR_MODE_PERIPHERAL) - return 1; - else if (cdns->current_dr_mode == USB_DR_MODE_OTG) - if (cdns3_get_id(cdns)) - return 1; - - return 0; -} - -/** - * cdns3_otg_disable_irq - Disable all OTG interrupts - * @cdns: Pointer to controller context structure - */ -static void cdns3_otg_disable_irq(struct cdns3 *cdns) -{ - writel(0, &cdns->otg_regs->ien); -} - -/** - * cdns3_otg_enable_irq - enable id and sess_valid interrupts - * @cdns: Pointer to controller context structure - */ -static void cdns3_otg_enable_irq(struct cdns3 *cdns) -{ - writel(OTGIEN_ID_CHANGE_INT | OTGIEN_VBUSVALID_RISE_INT | - OTGIEN_VBUSVALID_FALL_INT, &cdns->otg_regs->ien); -} - -/** - * cdns3_drd_switch_host - start/stop host - * @cdns: Pointer to controller context structure - * @on: 1 for start, 0 for stop - * - * Returns 0 on success otherwise negative errno - */ -int cdns3_drd_switch_host(struct cdns3 *cdns, int on) -{ - int ret; - u32 reg = OTGCMD_OTG_DIS; - - /* switch OTG core */ - if (on) { - writel(OTGCMD_HOST_BUS_REQ | reg, &cdns->otg_regs->cmd); - - dev_dbg(cdns->dev, "Waiting till Host mode is turned on\n"); - ret = cdns3_handshake(&cdns->otg_regs->sts, OTGSTS_XHCI_READY, - OTGSTS_XHCI_READY, 100000); - - if (ret) { - dev_err(cdns->dev, "timeout waiting for xhci_ready\n"); - return ret; - } - } else { - writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP | - OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF, - &cdns->otg_regs->cmd); - /* Waiting till H_IDLE state.*/ - cdns3_handshake(&cdns->otg_regs->state, - OTGSTATE_HOST_STATE_MASK, - 0, 2000000); - } - - return 0; -} - -/** - * cdns3_drd_switch_gadget - start/stop gadget - * @cdns: Pointer to controller context structure - * @on: 1 for start, 0 for stop - * - * Returns 0 on success otherwise negative errno - */ -int cdns3_drd_switch_gadget(struct cdns3 *cdns, int on) -{ - int ret; - u32 reg = OTGCMD_OTG_DIS; - - /* switch OTG core */ - if (on) { - writel(OTGCMD_DEV_BUS_REQ | reg, &cdns->otg_regs->cmd); - - dev_dbg(cdns->dev, "Waiting till Device mode is turned on\n"); - - ret = cdns3_handshake(&cdns->otg_regs->sts, OTGSTS_DEV_READY, - OTGSTS_DEV_READY, 100000); - - if (ret) { - dev_err(cdns->dev, "timeout waiting for dev_ready\n"); - return ret; - } - } else { - /* - * driver should wait at least 10us after disabling Device - * before turning-off Device (DEV_BUS_DROP) - */ - usleep_range(20, 30); - writel(OTGCMD_HOST_BUS_DROP | OTGCMD_DEV_BUS_DROP | - OTGCMD_DEV_POWER_OFF | OTGCMD_HOST_POWER_OFF, - &cdns->otg_regs->cmd); - /* Waiting till DEV_IDLE state.*/ - cdns3_handshake(&cdns->otg_regs->state, OTGSTATE_DEV_STATE_MASK, - 0, 2000000); - } - - return 0; -} - -/** - * cdns3_init_otg_mode - initialize drd controller - * @cdns: Pointer to controller context structure - * - * Returns 0 on success otherwise negative errno - */ -static int cdns3_init_otg_mode(struct cdns3 *cdns) -{ - int ret = 0; - - cdns3_otg_disable_irq(cdns); - /* clear all interrupts */ - writel(~0, &cdns->otg_regs->ivect); - - ret = cdns3_set_mode(cdns, USB_DR_MODE_OTG); - if (ret) - return ret; - - cdns3_otg_enable_irq(cdns); - return ret; -} - -/** - * cdns3_drd_update_mode - initialize mode of operation - * @cdns: Pointer to controller context structure - * - * Returns 0 on success otherwise negative errno - */ -int cdns3_drd_update_mode(struct cdns3 *cdns) -{ - int ret = 0; - - if (cdns->desired_dr_mode == cdns->current_dr_mode) - return ret; - - switch (cdns->desired_dr_mode) { - case USB_DR_MODE_PERIPHERAL: - ret = cdns3_set_mode(cdns, USB_DR_MODE_PERIPHERAL); - break; - case USB_DR_MODE_HOST: - ret = cdns3_set_mode(cdns, USB_DR_MODE_HOST); - break; - case USB_DR_MODE_OTG: - ret = cdns3_init_otg_mode(cdns); - break; - default: - dev_err(cdns->dev, "Unsupported mode of operation %d\n", - cdns->dr_mode); - return -EINVAL; - } - - return ret; -} - -/** - * cdns3_drd_irq - interrupt handler for OTG events - * - * @irq: irq number for cdns3 core device - * @data: structure of cdns3 - * - * Returns IRQ_HANDLED or IRQ_NONE - */ -static irqreturn_t cdns3_drd_irq(int irq, void *data) -{ - irqreturn_t ret = IRQ_NONE; - struct cdns3 *cdns = data; - u32 reg; - - if (cdns->dr_mode != USB_DR_MODE_OTG) - return ret; - - reg = readl(&cdns->otg_regs->ivect); - - if (!reg) - return ret; - - if (reg & OTGIEN_ID_CHANGE_INT) { - dev_dbg(cdns->dev, "OTG IRQ: new ID: %d\n", - cdns3_get_id(cdns)); - - ret = IRQ_HANDLED; - } - - if (reg & (OTGIEN_VBUSVALID_RISE_INT | OTGIEN_VBUSVALID_FALL_INT)) { - dev_dbg(cdns->dev, "OTG IRQ: new VBUS: %d\n", - cdns3_get_vbus(cdns)); - - ret = IRQ_HANDLED; - } - - if (ret == IRQ_HANDLED) - queue_work(system_freezable_wq, &cdns->role_switch_wq); - - writel(~0, &cdns->otg_regs->ivect); - return ret; -} - -int cdns3_drd_init(struct cdns3 *cdns) -{ - void __iomem *regs; - int ret = 0; - u32 state; - - regs = devm_ioremap_resource(cdns->dev, &cdns->otg_res); - if (IS_ERR(regs)) - return PTR_ERR(regs); - - /* Detection of DRD version. Controller has been released - * in two versions. Both are similar, but they have same changes - * in register maps. - * The first register in old version is command register and it's read - * only, so driver should read 0 from it. On the other hand, in v1 - * the first register contains device ID number which is not set to 0. - * Driver uses this fact to detect the proper version of - * controller. - */ - cdns->otg_v0_regs = regs; - if (!readl(&cdns->otg_v0_regs->cmd)) { - cdns->version = CDNS3_CONTROLLER_V0; - cdns->otg_v1_regs = NULL; - cdns->otg_regs = regs; - writel(1, &cdns->otg_v0_regs->simulate); - dev_info(cdns->dev, "DRD version v0 (%08x)\n", - readl(&cdns->otg_v0_regs->version)); - } else { - cdns->otg_v0_regs = NULL; - cdns->otg_v1_regs = regs; - cdns->otg_regs = (void *)&cdns->otg_v1_regs->cmd; - cdns->version = CDNS3_CONTROLLER_V1; - writel(1, &cdns->otg_v1_regs->simulate); - dev_info(cdns->dev, "DRD version v1 (ID: %08x, rev: %08x)\n", - readl(&cdns->otg_v1_regs->did), - readl(&cdns->otg_v1_regs->rid)); - } - - state = OTGSTS_STRAP(readl(&cdns->otg_regs->sts)); - - /* Update dr_mode according to STRAP configuration. */ - cdns->dr_mode = USB_DR_MODE_OTG; - if (state == OTGSTS_STRAP_HOST) { - dev_dbg(cdns->dev, "Controller strapped to HOST\n"); - cdns->dr_mode = USB_DR_MODE_HOST; - } else if (state == OTGSTS_STRAP_GADGET) { - dev_dbg(cdns->dev, "Controller strapped to PERIPHERAL\n"); - cdns->dr_mode = USB_DR_MODE_PERIPHERAL; - } - - cdns->desired_dr_mode = cdns->dr_mode; - cdns->current_dr_mode = USB_DR_MODE_UNKNOWN; - - ret = devm_request_threaded_irq(cdns->dev, cdns->otg_irq, - cdns3_drd_irq, - NULL, IRQF_SHARED, - dev_name(cdns->dev), cdns); - - if (ret) { - dev_err(cdns->dev, "couldn't get otg_irq\n"); - return ret; - } - - state = readl(&cdns->otg_regs->sts); - if (OTGSTS_OTG_NRDY(state) != 0) { - dev_err(cdns->dev, "Cadence USB3 OTG device not ready\n"); - return -ENODEV; - } - - return ret; -} - -int cdns3_drd_exit(struct cdns3 *cdns) -{ - return 0; -} |
