mfd: omap-usb-host: Add device tree support and binding information
Allows the OMAP HS USB host controller to be specified via device tree. Signed-off-by: Roger Quadros <rogerq@ti.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Roger Quadros
Samuel Ortiz
Родитель
40b0d68a8c
Коммит
03a8f438f5
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@ -0,0 +1,80 @@
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OMAP HS USB Host
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Required properties:
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- compatible: should be "ti,usbhs-host"
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- reg: should contain one register range i.e. start and length
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- ti,hwmods: must contain "usb_host_hs"
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Optional properties:
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- num-ports: number of USB ports. Usually this is automatically detected
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from the IP's revision register but can be overridden by specifying
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this property. A maximum of 3 ports are supported at the moment.
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- portN-mode: String specifying the port mode for port N, where N can be
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from 1 to 3. If the port mode is not specified, that port is treated
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as unused. When specified, it must be one of the following.
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"ehci-phy",
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"ehci-tll",
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"ehci-hsic",
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"ohci-phy-6pin-datse0",
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"ohci-phy-6pin-dpdm",
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"ohci-phy-3pin-datse0",
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"ohci-phy-4pin-dpdm",
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"ohci-tll-6pin-datse0",
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"ohci-tll-6pin-dpdm",
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"ohci-tll-3pin-datse0",
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"ohci-tll-4pin-dpdm",
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"ohci-tll-2pin-datse0",
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"ohci-tll-2pin-dpdm",
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- single-ulpi-bypass: Must be present if the controller contains a single
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ULPI bypass control bit. e.g. OMAP3 silicon <= ES2.1
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Required properties if child node exists:
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- #address-cells: Must be 1
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- #size-cells: Must be 1
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- ranges: must be present
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Properties for children:
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The OMAP HS USB Host subsystem contains EHCI and OHCI controllers.
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See Documentation/devicetree/bindings/usb/omap-ehci.txt and
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omap3-ohci.txt
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Example for OMAP4:
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usbhshost: usbhshost@4a064000 {
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compatible = "ti,usbhs-host";
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reg = <0x4a064000 0x800>;
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ti,hwmods = "usb_host_hs";
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#address-cells = <1>;
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#size-cells = <1>;
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ranges;
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usbhsohci: ohci@4a064800 {
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compatible = "ti,ohci-omap3", "usb-ohci";
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reg = <0x4a064800 0x400>;
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interrupt-parent = <&gic>;
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interrupts = <0 76 0x4>;
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};
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usbhsehci: ehci@4a064c00 {
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compatible = "ti,ehci-omap", "usb-ehci";
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reg = <0x4a064c00 0x400>;
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interrupt-parent = <&gic>;
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interrupts = <0 77 0x4>;
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};
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};
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&usbhshost {
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port1-mode = "ehci-phy";
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port2-mode = "ehci-tll";
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port3-mode = "ehci-phy";
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};
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&usbhsehci {
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phys = <&hsusb1_phy 0 &hsusb3_phy>;
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};
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@ -1,8 +1,9 @@
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/**
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* omap-usb-host.c - The USBHS core driver for OMAP EHCI & OHCI
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*
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* Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
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* Copyright (C) 2011-2013 Texas Instruments Incorporated - http://www.ti.com
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* Author: Keshava Munegowda <keshava_mgowda@ti.com>
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* Author: Roger Quadros <rogerq@ti.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 version 2 of
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@ -27,6 +28,8 @@
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#include <linux/platform_device.h>
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#include <linux/platform_data/usb-omap.h>
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#include <linux/pm_runtime.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include "omap-usb.h"
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@ -137,6 +140,49 @@ static inline u8 usbhs_readb(void __iomem *base, u8 reg)
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/*-------------------------------------------------------------------------*/
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/**
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* Map 'enum usbhs_omap_port_mode' found in <linux/platform_data/usb-omap.h>
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* to the device tree binding portN-mode found in
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* 'Documentation/devicetree/bindings/mfd/omap-usb-host.txt'
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*/
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static const char * const port_modes[] = {
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[OMAP_USBHS_PORT_MODE_UNUSED] = "",
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[OMAP_EHCI_PORT_MODE_PHY] = "ehci-phy",
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[OMAP_EHCI_PORT_MODE_TLL] = "ehci-tll",
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[OMAP_EHCI_PORT_MODE_HSIC] = "ehci-hsic",
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[OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0] = "ohci-phy-6pin-datse0",
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[OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM] = "ohci-phy-6pin-dpdm",
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[OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0] = "ohci-phy-3pin-datse0",
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[OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM] = "ohci-phy-4pin-dpdm",
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[OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0] = "ohci-tll-6pin-datse0",
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[OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM] = "ohci-tll-6pin-dpdm",
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[OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0] = "ohci-tll-3pin-datse0",
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[OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM] = "ohci-tll-4pin-dpdm",
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[OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0] = "ohci-tll-2pin-datse0",
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[OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM] = "ohci-tll-2pin-dpdm",
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};
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/**
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* omap_usbhs_get_dt_port_mode - Get the 'enum usbhs_omap_port_mode'
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* from the port mode string.
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* @mode: The port mode string, usually obtained from device tree.
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*
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* The function returns the 'enum usbhs_omap_port_mode' that matches the
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* provided port mode string as per the port_modes table.
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* If no match is found it returns -ENODEV
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*/
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static const int omap_usbhs_get_dt_port_mode(const char *mode)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(port_modes); i++) {
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if (!strcmp(mode, port_modes[i]))
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return i;
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}
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return -ENODEV;
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}
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static struct platform_device *omap_usbhs_alloc_child(const char *name,
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struct resource *res, int num_resources, void *pdata,
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size_t pdata_size, struct device *dev)
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@ -464,6 +510,58 @@ static void omap_usbhs_init(struct device *dev)
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pm_runtime_put_sync(dev);
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}
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static int usbhs_omap_get_dt_pdata(struct device *dev,
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struct usbhs_omap_platform_data *pdata)
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{
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int ret, i;
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struct device_node *node = dev->of_node;
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ret = of_property_read_u32(node, "num-ports", &pdata->nports);
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if (ret)
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pdata->nports = 0;
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if (pdata->nports > OMAP3_HS_USB_PORTS) {
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dev_warn(dev, "Too many num_ports <%d> in device tree. Max %d\n",
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pdata->nports, OMAP3_HS_USB_PORTS);
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return -ENODEV;
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}
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/* get port modes */
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for (i = 0; i < OMAP3_HS_USB_PORTS; i++) {
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char prop[11];
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const char *mode;
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pdata->port_mode[i] = OMAP_USBHS_PORT_MODE_UNUSED;
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snprintf(prop, sizeof(prop), "port%d-mode", i + 1);
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ret = of_property_read_string(node, prop, &mode);
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if (ret < 0)
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continue;
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ret = omap_usbhs_get_dt_port_mode(mode);
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if (ret < 0) {
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dev_warn(dev, "Invalid port%d-mode \"%s\" in device tree\n",
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i, mode);
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return -ENODEV;
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}
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dev_dbg(dev, "port%d-mode: %s -> %d\n", i, mode, ret);
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pdata->port_mode[i] = ret;
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}
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/* get flags */
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pdata->single_ulpi_bypass = of_property_read_bool(node,
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"single-ulpi-bypass");
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return 0;
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}
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static struct of_device_id usbhs_child_match_table[] = {
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{ .compatible = "ti,omap-ehci", },
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{ .compatible = "ti,omap-ohci", },
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{ }
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};
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/**
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* usbhs_omap_probe - initialize TI-based HCDs
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*
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@ -479,18 +577,37 @@ static int usbhs_omap_probe(struct platform_device *pdev)
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int i;
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bool need_logic_fck;
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if (dev->of_node) {
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/* For DT boot we populate platform data from OF node */
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pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
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if (!pdata)
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return -ENOMEM;
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ret = usbhs_omap_get_dt_pdata(dev, pdata);
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if (ret)
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return ret;
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dev->platform_data = pdata;
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}
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if (!pdata) {
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dev_err(dev, "Missing platform data\n");
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return -ENODEV;
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}
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if (pdata->nports > OMAP3_HS_USB_PORTS) {
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dev_info(dev, "Too many num_ports <%d> in platform_data. Max %d\n",
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pdata->nports, OMAP3_HS_USB_PORTS);
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return -ENODEV;
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}
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omap = devm_kzalloc(dev, sizeof(*omap), GFP_KERNEL);
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if (!omap) {
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dev_err(dev, "Memory allocation failed\n");
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return -ENOMEM;
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}
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res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "uhh");
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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omap->uhh_base = devm_request_and_ioremap(dev, res);
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if (!omap->uhh_base) {
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dev_err(dev, "Resource request/ioremap failed\n");
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@ -661,10 +778,23 @@ static int usbhs_omap_probe(struct platform_device *pdev)
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}
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omap_usbhs_init(dev);
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ret = omap_usbhs_alloc_children(pdev);
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if (ret) {
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dev_err(dev, "omap_usbhs_alloc_children failed\n");
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goto err_alloc;
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if (dev->of_node) {
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ret = of_platform_populate(dev->of_node,
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usbhs_child_match_table, NULL, dev);
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if (ret) {
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dev_err(dev, "Failed to create DT children: %d\n", ret);
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goto err_alloc;
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}
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} else {
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ret = omap_usbhs_alloc_children(pdev);
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if (ret) {
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dev_err(dev, "omap_usbhs_alloc_children failed: %d\n",
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ret);
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goto err_alloc;
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}
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}
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return 0;
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@ -703,6 +833,13 @@ err_mem:
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return ret;
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}
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static int usbhs_omap_remove_child(struct device *dev, void *data)
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{
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dev_info(dev, "unregistering\n");
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platform_device_unregister(to_platform_device(dev));
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return 0;
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}
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/**
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* usbhs_omap_remove - shutdown processing for UHH & TLL HCDs
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* @pdev: USB Host Controller being removed
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@ -734,6 +871,8 @@ static int usbhs_omap_remove(struct platform_device *pdev)
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pm_runtime_disable(&pdev->dev);
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/* remove children */
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device_for_each_child(&pdev->dev, NULL, usbhs_omap_remove_child);
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return 0;
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}
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@ -742,16 +881,26 @@ static const struct dev_pm_ops usbhsomap_dev_pm_ops = {
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.runtime_resume = usbhs_runtime_resume,
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};
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static const struct of_device_id usbhs_omap_dt_ids[] = {
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{ .compatible = "ti,usbhs-host" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, usbhs_omap_dt_ids);
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static struct platform_driver usbhs_omap_driver = {
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.driver = {
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.name = (char *)usbhs_driver_name,
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.owner = THIS_MODULE,
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.pm = &usbhsomap_dev_pm_ops,
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.of_match_table = of_match_ptr(usbhs_omap_dt_ids),
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},
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.remove = usbhs_omap_remove,
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};
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MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@ti.com>");
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MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>");
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MODULE_ALIAS("platform:" USBHS_DRIVER_NAME);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("usb host common core driver for omap EHCI and OHCI");
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