ar71xx: Chipidea USB device support

Changes the platform to use the Chipidea driver instead of the
generic USB host driver which has support for both host and
device modes (selected on boot).

The changes in 930-chipidea-pullup.patch are already in mainline.
I'll upstream 920-usb-chipidea-AR933x-platform-support.patch once I
can test the changes with a newer kernel.

Signed-off-by: Svetoslav Neykov <svetoslav@neykov.name>

1 files changed, 99 insertions, 0 deletions

diff --git a/target/linux/ar71xx/patches-4.4/920-usb-chipidea-AR933x-platform-support.patch b/target/linux/ar71xx/patches-4.4/920-usb-chipidea-AR933x-platform-support.patch
new file mode 100644
index 0000000000..41eb7f2895
--- /dev/null
+++ b/target/linux/ar71xx/patches-4.4/920-usb-chipidea-AR933x-platform-support.patch
@@ -0,0 +1,99 @@
+Index: linux-4.4.4/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+===================================================================
+--- linux-4.4.4.orig/arch/mips/include/asm/mach-ath79/ar71xx_regs.h	2016-03-31 21:43:10.595132564 +0300
++++ linux-4.4.4/arch/mips/include/asm/mach-ath79/ar71xx_regs.h	2016-03-31 21:56:21.463152017 +0300
+@@ -641,6 +641,7 @@
+ 
+ #define AR933X_BOOTSTRAP_MDIO_GPIO_EN	BIT(18)
+ #define AR933X_BOOTSTRAP_EEPBUSY	BIT(4)
++#define AR933X_BOOTSTRAP_USB_MODE_HOST	BIT(3)
+ #define AR933X_BOOTSTRAP_REF_CLK_40	BIT(0)
+ 
+ #define AR934X_BOOTSTRAP_SW_OPTION8	BIT(23)
+@@ -670,6 +671,8 @@
+ 
+ #define QCA956X_BOOTSTRAP_REF_CLK_40	BIT(2)
+ 
++#define AR933X_USB_CONFIG_HOST_ONLY   BIT(8)
++
+ #define AR934X_PCIE_WMAC_INT_WMAC_MISC		BIT(0)
+ #define AR934X_PCIE_WMAC_INT_WMAC_TX		BIT(1)
+ #define AR934X_PCIE_WMAC_INT_WMAC_RXLP		BIT(2)
+Index: linux-4.4.4/arch/mips/ath79/dev-usb.c
+===================================================================
+--- linux-4.4.4.orig/arch/mips/ath79/dev-usb.c	2016-03-31 21:43:10.407132560 +0300
++++ linux-4.4.4/arch/mips/ath79/dev-usb.c	2016-03-31 21:43:10.707132567 +0300
+@@ -19,6 +19,9 @@
+ #include <linux/platform_device.h>
+ #include <linux/usb/ehci_pdriver.h>
+ #include <linux/usb/ohci_pdriver.h>
++#include <linux/usb/otg.h>
++#include <linux/usb/chipidea.h>
++#include <linux/usb/usb_phy_generic.h>
+ 
+ #include <asm/mach-ath79/ath79.h>
+ #include <asm/mach-ath79/ar71xx_regs.h>
+@@ -170,6 +173,54 @@
+ 			   &ath79_ehci_pdata_v2, sizeof(ath79_ehci_pdata_v2));
+ }
+ 
++static void __init ar933x_usb_setup_ctrl_config(void)
++{
++	void __iomem *usb_ctrl_base, *usb_config_reg;
++	u32 usb_config;
++
++	usb_ctrl_base = ioremap(AR71XX_USB_CTRL_BASE, AR71XX_USB_CTRL_SIZE);
++	usb_config_reg = usb_ctrl_base + AR71XX_USB_CTRL_REG_CONFIG;
++	usb_config = __raw_readl(usb_config_reg);
++	usb_config &= ~AR933X_USB_CONFIG_HOST_ONLY;
++	__raw_writel(usb_config, usb_config_reg);
++	iounmap(usb_ctrl_base);
++}
++
++static void __init ar933x_ci_usb_setup(void)
++{
++	u32 bootstrap;
++	enum usb_dr_mode dr_mode;
++	struct ci_hdrc_platform_data ci_pdata;
++	struct platform_device *phy;
++
++	bootstrap = ath79_reset_rr(AR933X_RESET_REG_BOOTSTRAP);
++	if (bootstrap & AR933X_BOOTSTRAP_USB_MODE_HOST) {
++		dr_mode = USB_DR_MODE_HOST;
++	} else {
++		dr_mode = USB_DR_MODE_PERIPHERAL;
++		ar933x_usb_setup_ctrl_config();
++	}
++
++	memset(&ci_pdata, 0, sizeof(ci_pdata));
++	ci_pdata.name = "ci_hdrc_ar933x";
++	ci_pdata.capoffset = DEF_CAPOFFSET;
++	ci_pdata.dr_mode = dr_mode;
++	ci_pdata.flags = CI_HDRC_DUAL_ROLE_NOT_OTG | CI_HDRC_DP_ALWAYS_PULLUP;
++	ci_pdata.vbus_extcon.edev = ERR_PTR(-ENODEV);
++	ci_pdata.id_extcon.edev = ERR_PTR(-ENODEV);
++	ci_pdata.itc_setting = 1;
++
++	/* register a nop PHY */
++	phy = usb_phy_generic_register();
++	if (IS_ERR(phy))
++		return;
++
++	ath79_usb_register("ci_hdrc", -1,
++			   AR933X_EHCI_BASE, AR933X_EHCI_SIZE,
++			   ATH79_CPU_IRQ(3),
++			   &ci_pdata, sizeof(ci_pdata));
++}
++
+ static void __init ar933x_usb_setup(void)
+ {
+ 	ath79_device_reset_set(AR933X_RESET_USBSUS_OVERRIDE);
+@@ -185,6 +236,8 @@
+ 			   AR933X_EHCI_BASE, AR933X_EHCI_SIZE,
+ 			   ATH79_CPU_IRQ(3),
+ 			   &ath79_ehci_pdata_v2, sizeof(ath79_ehci_pdata_v2));
++
++	ar933x_ci_usb_setup();
+ }
+ 
+ static void enable_tx_tx_idp_violation_fix(unsigned base)