mirror of https://gitee.com/openkylin/linux.git
usb: add ab8500 usb transceiver driver
Basic driver for ab8500 usb otg transceiver TODO: -Regulators support -Host and OTG testing -Interface with PRCMU -Charging support Signed-off-by: Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Mian Yousaf Kaukab
Greg Kroah-Hartman
parent
2d0cdcc5a0
commit
969152341e
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@ -92,4 +92,13 @@ config USB_MSM_OTG_72K
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This driver is required even for peripheral only or host only
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mode configurations.
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config AB8500_USB
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tristate "AB8500 USB Transceiver Driver"
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depends on AB8500_CORE
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select USB_OTG_UTILS
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help
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Enable this to support the USB OTG transceiver in AB8500 chip.
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This transceiver supports high and full speed devices plus,
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in host mode, low speed.
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endif # USB || OTG
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@ -16,3 +16,4 @@ obj-$(CONFIG_USB_LANGWELL_OTG) += langwell_otg.o
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obj-$(CONFIG_NOP_USB_XCEIV) += nop-usb-xceiv.o
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obj-$(CONFIG_USB_ULPI) += ulpi.o
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obj-$(CONFIG_USB_MSM_OTG_72K) += msm72k_otg.o
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obj-$(CONFIG_AB8500_USB) += ab8500-usb.o
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@ -0,0 +1,585 @@
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/*
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* drivers/usb/otg/ab8500_usb.c
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*
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* USB transceiver driver for AB8500 chip
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*
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* Copyright (C) 2010 ST-Ericsson AB
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* Mian Yousaf Kaukab <mian.yousaf.kaukab@stericsson.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/usb/otg.h>
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#include <linux/slab.h>
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#include <linux/notifier.h>
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#include <linux/interrupt.h>
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#include <linux/delay.h>
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#include <linux/mfd/abx500.h>
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#include <linux/mfd/ab8500.h>
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#define AB8500_MAIN_WD_CTRL_REG 0x01
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#define AB8500_USB_LINE_STAT_REG 0x80
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#define AB8500_USB_PHY_CTRL_REG 0x8A
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#define AB8500_BIT_OTG_STAT_ID (1 << 0)
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#define AB8500_BIT_PHY_CTRL_HOST_EN (1 << 0)
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#define AB8500_BIT_PHY_CTRL_DEVICE_EN (1 << 1)
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#define AB8500_BIT_WD_CTRL_ENABLE (1 << 0)
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#define AB8500_BIT_WD_CTRL_KICK (1 << 1)
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#define AB8500_V1x_LINK_STAT_WAIT (HZ/10)
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#define AB8500_WD_KICK_DELAY_US 100 /* usec */
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#define AB8500_WD_V11_DISABLE_DELAY_US 100 /* usec */
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#define AB8500_WD_V10_DISABLE_DELAY_MS 100 /* ms */
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/* Usb line status register */
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enum ab8500_usb_link_status {
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USB_LINK_NOT_CONFIGURED = 0,
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USB_LINK_STD_HOST_NC,
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USB_LINK_STD_HOST_C_NS,
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USB_LINK_STD_HOST_C_S,
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USB_LINK_HOST_CHG_NM,
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USB_LINK_HOST_CHG_HS,
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USB_LINK_HOST_CHG_HS_CHIRP,
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USB_LINK_DEDICATED_CHG,
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USB_LINK_ACA_RID_A,
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USB_LINK_ACA_RID_B,
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USB_LINK_ACA_RID_C_NM,
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USB_LINK_ACA_RID_C_HS,
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USB_LINK_ACA_RID_C_HS_CHIRP,
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USB_LINK_HM_IDGND,
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USB_LINK_RESERVED,
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USB_LINK_NOT_VALID_LINK
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};
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struct ab8500_usb {
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struct otg_transceiver otg;
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struct device *dev;
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int irq_num_id_rise;
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int irq_num_id_fall;
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int irq_num_vbus_rise;
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int irq_num_vbus_fall;
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int irq_num_link_status;
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unsigned vbus_draw;
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struct delayed_work dwork;
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struct work_struct phy_dis_work;
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unsigned long link_status_wait;
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int rev;
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};
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static inline struct ab8500_usb *xceiv_to_ab(struct otg_transceiver *x)
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{
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return container_of(x, struct ab8500_usb, otg);
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}
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static void ab8500_usb_wd_workaround(struct ab8500_usb *ab)
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{
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abx500_set_register_interruptible(ab->dev,
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AB8500_SYS_CTRL2_BLOCK,
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AB8500_MAIN_WD_CTRL_REG,
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AB8500_BIT_WD_CTRL_ENABLE);
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udelay(AB8500_WD_KICK_DELAY_US);
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abx500_set_register_interruptible(ab->dev,
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AB8500_SYS_CTRL2_BLOCK,
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AB8500_MAIN_WD_CTRL_REG,
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(AB8500_BIT_WD_CTRL_ENABLE
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| AB8500_BIT_WD_CTRL_KICK));
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if (ab->rev > 0x10) /* v1.1 v2.0 */
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udelay(AB8500_WD_V11_DISABLE_DELAY_US);
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else /* v1.0 */
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msleep(AB8500_WD_V10_DISABLE_DELAY_MS);
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abx500_set_register_interruptible(ab->dev,
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AB8500_SYS_CTRL2_BLOCK,
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AB8500_MAIN_WD_CTRL_REG,
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0);
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}
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static void ab8500_usb_phy_ctrl(struct ab8500_usb *ab, bool sel_host,
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bool enable)
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{
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u8 ctrl_reg;
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abx500_get_register_interruptible(ab->dev,
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AB8500_USB,
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AB8500_USB_PHY_CTRL_REG,
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&ctrl_reg);
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if (sel_host) {
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if (enable)
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ctrl_reg |= AB8500_BIT_PHY_CTRL_HOST_EN;
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else
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ctrl_reg &= ~AB8500_BIT_PHY_CTRL_HOST_EN;
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} else {
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if (enable)
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ctrl_reg |= AB8500_BIT_PHY_CTRL_DEVICE_EN;
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else
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ctrl_reg &= ~AB8500_BIT_PHY_CTRL_DEVICE_EN;
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}
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abx500_set_register_interruptible(ab->dev,
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AB8500_USB,
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AB8500_USB_PHY_CTRL_REG,
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ctrl_reg);
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/* Needed to enable the phy.*/
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if (enable)
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ab8500_usb_wd_workaround(ab);
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}
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#define ab8500_usb_host_phy_en(ab) ab8500_usb_phy_ctrl(ab, true, true)
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#define ab8500_usb_host_phy_dis(ab) ab8500_usb_phy_ctrl(ab, true, false)
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#define ab8500_usb_peri_phy_en(ab) ab8500_usb_phy_ctrl(ab, false, true)
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#define ab8500_usb_peri_phy_dis(ab) ab8500_usb_phy_ctrl(ab, false, false)
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static int ab8500_usb_link_status_update(struct ab8500_usb *ab)
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{
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u8 reg;
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enum ab8500_usb_link_status lsts;
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void *v = NULL;
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enum usb_xceiv_events event;
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abx500_get_register_interruptible(ab->dev,
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AB8500_USB,
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AB8500_USB_LINE_STAT_REG,
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®);
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lsts = (reg >> 3) & 0x0F;
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switch (lsts) {
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case USB_LINK_NOT_CONFIGURED:
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case USB_LINK_RESERVED:
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case USB_LINK_NOT_VALID_LINK:
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/* TODO: Disable regulators. */
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ab8500_usb_host_phy_dis(ab);
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ab8500_usb_peri_phy_dis(ab);
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ab->otg.state = OTG_STATE_B_IDLE;
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ab->otg.default_a = false;
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ab->vbus_draw = 0;
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event = USB_EVENT_NONE;
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break;
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case USB_LINK_STD_HOST_NC:
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case USB_LINK_STD_HOST_C_NS:
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case USB_LINK_STD_HOST_C_S:
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case USB_LINK_HOST_CHG_NM:
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case USB_LINK_HOST_CHG_HS:
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case USB_LINK_HOST_CHG_HS_CHIRP:
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if (ab->otg.gadget) {
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/* TODO: Enable regulators. */
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ab8500_usb_peri_phy_en(ab);
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v = ab->otg.gadget;
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}
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event = USB_EVENT_VBUS;
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break;
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case USB_LINK_HM_IDGND:
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if (ab->otg.host) {
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/* TODO: Enable regulators. */
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ab8500_usb_host_phy_en(ab);
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v = ab->otg.host;
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}
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ab->otg.state = OTG_STATE_A_IDLE;
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ab->otg.default_a = true;
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event = USB_EVENT_ID;
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break;
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case USB_LINK_ACA_RID_A:
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case USB_LINK_ACA_RID_B:
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/* TODO */
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case USB_LINK_ACA_RID_C_NM:
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case USB_LINK_ACA_RID_C_HS:
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case USB_LINK_ACA_RID_C_HS_CHIRP:
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case USB_LINK_DEDICATED_CHG:
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/* TODO: vbus_draw */
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event = USB_EVENT_CHARGER;
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break;
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}
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blocking_notifier_call_chain(&ab->otg.notifier, event, v);
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return 0;
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}
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static void ab8500_usb_delayed_work(struct work_struct *work)
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{
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struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
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dwork.work);
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ab8500_usb_link_status_update(ab);
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}
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static irqreturn_t ab8500_usb_v1x_common_irq(int irq, void *data)
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{
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struct ab8500_usb *ab = (struct ab8500_usb *) data;
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/* Wait for link status to become stable. */
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schedule_delayed_work(&ab->dwork, ab->link_status_wait);
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return IRQ_HANDLED;
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}
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static irqreturn_t ab8500_usb_v1x_vbus_fall_irq(int irq, void *data)
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{
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struct ab8500_usb *ab = (struct ab8500_usb *) data;
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/* Link status will not be updated till phy is disabled. */
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ab8500_usb_peri_phy_dis(ab);
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/* Wait for link status to become stable. */
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schedule_delayed_work(&ab->dwork, ab->link_status_wait);
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return IRQ_HANDLED;
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}
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static irqreturn_t ab8500_usb_v20_irq(int irq, void *data)
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{
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struct ab8500_usb *ab = (struct ab8500_usb *) data;
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ab8500_usb_link_status_update(ab);
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return IRQ_HANDLED;
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}
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static void ab8500_usb_phy_disable_work(struct work_struct *work)
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{
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struct ab8500_usb *ab = container_of(work, struct ab8500_usb,
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phy_dis_work);
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if (!ab->otg.host)
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ab8500_usb_host_phy_dis(ab);
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if (!ab->otg.gadget)
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ab8500_usb_peri_phy_dis(ab);
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}
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static int ab8500_usb_set_power(struct otg_transceiver *otg, unsigned mA)
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{
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struct ab8500_usb *ab;
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if (!otg)
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return -ENODEV;
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ab = xceiv_to_ab(otg);
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ab->vbus_draw = mA;
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if (mA)
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blocking_notifier_call_chain(&ab->otg.notifier,
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USB_EVENT_ENUMERATED, ab->otg.gadget);
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return 0;
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}
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/* TODO: Implement some way for charging or other drivers to read
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* ab->vbus_draw.
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*/
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static int ab8500_usb_set_suspend(struct otg_transceiver *x, int suspend)
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{
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/* TODO */
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return 0;
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}
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static int ab8500_usb_set_peripheral(struct otg_transceiver *otg,
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struct usb_gadget *gadget)
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{
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struct ab8500_usb *ab;
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if (!otg)
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return -ENODEV;
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ab = xceiv_to_ab(otg);
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/* Some drivers call this function in atomic context.
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* Do not update ab8500 registers directly till this
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* is fixed.
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*/
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if (!gadget) {
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/* TODO: Disable regulators. */
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ab->otg.gadget = NULL;
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schedule_work(&ab->phy_dis_work);
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} else {
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ab->otg.gadget = gadget;
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ab->otg.state = OTG_STATE_B_IDLE;
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/* Phy will not be enabled if cable is already
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* plugged-in. Schedule to enable phy.
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* Use same delay to avoid any race condition.
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*/
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schedule_delayed_work(&ab->dwork, ab->link_status_wait);
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}
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return 0;
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}
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static int ab8500_usb_set_host(struct otg_transceiver *otg,
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struct usb_bus *host)
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{
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struct ab8500_usb *ab;
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if (!otg)
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return -ENODEV;
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ab = xceiv_to_ab(otg);
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/* Some drivers call this function in atomic context.
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* Do not update ab8500 registers directly till this
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* is fixed.
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*/
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if (!host) {
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/* TODO: Disable regulators. */
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ab->otg.host = NULL;
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schedule_work(&ab->phy_dis_work);
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} else {
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ab->otg.host = host;
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/* Phy will not be enabled if cable is already
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* plugged-in. Schedule to enable phy.
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* Use same delay to avoid any race condition.
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*/
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schedule_delayed_work(&ab->dwork, ab->link_status_wait);
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}
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return 0;
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}
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static void ab8500_usb_irq_free(struct ab8500_usb *ab)
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{
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if (ab->rev < 0x20) {
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free_irq(ab->irq_num_id_rise, ab);
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free_irq(ab->irq_num_id_fall, ab);
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free_irq(ab->irq_num_vbus_rise, ab);
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free_irq(ab->irq_num_vbus_fall, ab);
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} else {
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free_irq(ab->irq_num_link_status, ab);
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}
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}
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static int ab8500_usb_v1x_res_setup(struct platform_device *pdev,
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struct ab8500_usb *ab)
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{
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int err;
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ab->irq_num_id_rise = platform_get_irq_byname(pdev, "ID_WAKEUP_R");
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if (ab->irq_num_id_rise < 0) {
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dev_err(&pdev->dev, "ID rise irq not found\n");
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return ab->irq_num_id_rise;
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}
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err = request_threaded_irq(ab->irq_num_id_rise, NULL,
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ab8500_usb_v1x_common_irq,
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IRQF_NO_SUSPEND | IRQF_SHARED,
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"usb-id-rise", ab);
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if (err < 0) {
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dev_err(ab->dev, "request_irq failed for ID rise irq\n");
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goto fail0;
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}
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ab->irq_num_id_fall = platform_get_irq_byname(pdev, "ID_WAKEUP_F");
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if (ab->irq_num_id_fall < 0) {
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dev_err(&pdev->dev, "ID fall irq not found\n");
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return ab->irq_num_id_fall;
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}
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err = request_threaded_irq(ab->irq_num_id_fall, NULL,
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ab8500_usb_v1x_common_irq,
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IRQF_NO_SUSPEND | IRQF_SHARED,
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"usb-id-fall", ab);
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if (err < 0) {
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dev_err(ab->dev, "request_irq failed for ID fall irq\n");
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goto fail1;
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}
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ab->irq_num_vbus_rise = platform_get_irq_byname(pdev, "VBUS_DET_R");
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if (ab->irq_num_vbus_rise < 0) {
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dev_err(&pdev->dev, "VBUS rise irq not found\n");
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return ab->irq_num_vbus_rise;
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}
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err = request_threaded_irq(ab->irq_num_vbus_rise, NULL,
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ab8500_usb_v1x_common_irq,
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IRQF_NO_SUSPEND | IRQF_SHARED,
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"usb-vbus-rise", ab);
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if (err < 0) {
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dev_err(ab->dev, "request_irq failed for Vbus rise irq\n");
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goto fail2;
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}
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ab->irq_num_vbus_fall = platform_get_irq_byname(pdev, "VBUS_DET_F");
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if (ab->irq_num_vbus_fall < 0) {
|
||||
dev_err(&pdev->dev, "VBUS fall irq not found\n");
|
||||
return ab->irq_num_vbus_fall;
|
||||
}
|
||||
err = request_threaded_irq(ab->irq_num_vbus_fall, NULL,
|
||||
ab8500_usb_v1x_vbus_fall_irq,
|
||||
IRQF_NO_SUSPEND | IRQF_SHARED,
|
||||
"usb-vbus-fall", ab);
|
||||
if (err < 0) {
|
||||
dev_err(ab->dev, "request_irq failed for Vbus fall irq\n");
|
||||
goto fail3;
|
||||
}
|
||||
|
||||
return 0;
|
||||
fail3:
|
||||
free_irq(ab->irq_num_vbus_rise, ab);
|
||||
fail2:
|
||||
free_irq(ab->irq_num_id_fall, ab);
|
||||
fail1:
|
||||
free_irq(ab->irq_num_id_rise, ab);
|
||||
fail0:
|
||||
return err;
|
||||
}
|
||||
|
||||
static int ab8500_usb_v2_res_setup(struct platform_device *pdev,
|
||||
struct ab8500_usb *ab)
|
||||
{
|
||||
int err;
|
||||
|
||||
ab->irq_num_link_status = platform_get_irq_byname(pdev,
|
||||
"USB_LINK_STATUS");
|
||||
if (ab->irq_num_link_status < 0) {
|
||||
dev_err(&pdev->dev, "Link status irq not found\n");
|
||||
return ab->irq_num_link_status;
|
||||
}
|
||||
|
||||
err = request_threaded_irq(ab->irq_num_link_status, NULL,
|
||||
ab8500_usb_v20_irq,
|
||||
IRQF_NO_SUSPEND | IRQF_SHARED,
|
||||
"usb-link-status", ab);
|
||||
if (err < 0) {
|
||||
dev_err(ab->dev,
|
||||
"request_irq failed for link status irq\n");
|
||||
return err;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int __devinit ab8500_usb_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct ab8500_usb *ab;
|
||||
int err;
|
||||
int rev;
|
||||
|
||||
rev = abx500_get_chip_id(&pdev->dev);
|
||||
if (rev < 0) {
|
||||
dev_err(&pdev->dev, "Chip id read failed\n");
|
||||
return rev;
|
||||
} else if (rev < 0x10) {
|
||||
dev_err(&pdev->dev, "Unsupported AB8500 chip\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
ab = kzalloc(sizeof *ab, GFP_KERNEL);
|
||||
if (!ab)
|
||||
return -ENOMEM;
|
||||
|
||||
ab->dev = &pdev->dev;
|
||||
ab->rev = rev;
|
||||
ab->otg.dev = ab->dev;
|
||||
ab->otg.label = "ab8500";
|
||||
ab->otg.state = OTG_STATE_UNDEFINED;
|
||||
ab->otg.set_host = ab8500_usb_set_host;
|
||||
ab->otg.set_peripheral = ab8500_usb_set_peripheral;
|
||||
ab->otg.set_suspend = ab8500_usb_set_suspend;
|
||||
ab->otg.set_power = ab8500_usb_set_power;
|
||||
|
||||
platform_set_drvdata(pdev, ab);
|
||||
|
||||
BLOCKING_INIT_NOTIFIER_HEAD(&ab->otg.notifier);
|
||||
|
||||
/* v1: Wait for link status to become stable.
|
||||
* all: Updates form set_host and set_peripheral as they are atomic.
|
||||
*/
|
||||
INIT_DELAYED_WORK(&ab->dwork, ab8500_usb_delayed_work);
|
||||
|
||||
/* all: Disable phy when called from set_host and set_peripheral */
|
||||
INIT_WORK(&ab->phy_dis_work, ab8500_usb_phy_disable_work);
|
||||
|
||||
if (ab->rev < 0x20) {
|
||||
err = ab8500_usb_v1x_res_setup(pdev, ab);
|
||||
ab->link_status_wait = AB8500_V1x_LINK_STAT_WAIT;
|
||||
} else {
|
||||
err = ab8500_usb_v2_res_setup(pdev, ab);
|
||||
}
|
||||
|
||||
if (err < 0)
|
||||
goto fail0;
|
||||
|
||||
err = otg_set_transceiver(&ab->otg);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "Can't register transceiver\n");
|
||||
goto fail1;
|
||||
}
|
||||
|
||||
dev_info(&pdev->dev, "AB8500 usb driver initialized\n");
|
||||
|
||||
return 0;
|
||||
fail1:
|
||||
ab8500_usb_irq_free(ab);
|
||||
fail0:
|
||||
kfree(ab);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __devexit ab8500_usb_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct ab8500_usb *ab = platform_get_drvdata(pdev);
|
||||
|
||||
ab8500_usb_irq_free(ab);
|
||||
|
||||
cancel_delayed_work_sync(&ab->dwork);
|
||||
|
||||
cancel_work_sync(&ab->phy_dis_work);
|
||||
|
||||
otg_set_transceiver(NULL);
|
||||
|
||||
ab8500_usb_host_phy_dis(ab);
|
||||
ab8500_usb_peri_phy_dis(ab);
|
||||
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
|
||||
kfree(ab);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct platform_driver ab8500_usb_driver = {
|
||||
.probe = ab8500_usb_probe,
|
||||
.remove = __devexit_p(ab8500_usb_remove),
|
||||
.driver = {
|
||||
.name = "ab8500-usb",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init ab8500_usb_init(void)
|
||||
{
|
||||
return platform_driver_register(&ab8500_usb_driver);
|
||||
}
|
||||
subsys_initcall(ab8500_usb_init);
|
||||
|
||||
static void __exit ab8500_usb_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&ab8500_usb_driver);
|
||||
}
|
||||
module_exit(ab8500_usb_exit);
|
||||
|
||||
MODULE_ALIAS("platform:ab8500_usb");
|
||||
MODULE_AUTHOR("ST-Ericsson AB");
|
||||
MODULE_DESCRIPTION("AB8500 usb transceiver driver");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue