This driver adds support of PIC32 MUSB OTG controller as dual role device. It implements platform specific glue to reuse musb core.

Signed-off-by: Cristian Birsan cristian.birsan@microchip.com Signed-off-by: Purna Chandra Mandal purna.mandal@microchip.com

---

Changes in v5: - drop OR'ing irqreturn_t in pic32_interrupt().

Changes in v4: - add support to handle multiple MUSB controllers. - remove unaligned buffer handling in musb_read_fifo - update comment and error prints

Changes in v3: None Changes in v2: None

drivers/usb/musb-new/Kconfig | 7 + drivers/usb/musb-new/Makefile | 1 + drivers/usb/musb-new/musb_core.c | 2 +- drivers/usb/musb-new/pic32.c | 288 +++++++++++++++++++++++++++++++++++++++ 4 files changed, 297 insertions(+), 1 deletion(-) create mode 100644 drivers/usb/musb-new/pic32.c

diff --git a/drivers/usb/musb-new/Kconfig b/drivers/usb/musb-new/Kconfig index 6a6cb93..4e8a543 100644 --- a/drivers/usb/musb-new/Kconfig +++ b/drivers/usb/musb-new/Kconfig @@ -15,6 +15,13 @@ config USB_MUSB_GADGET

if USB_MUSB_HOST || USB_MUSB_GADGET

+config USB_MUSB_PIC32 + bool "Enable Microchip PIC32 DRC USB controller" + depends on DM_USB && MACH_PIC32 + help + Say y to enable PIC32 USB DRC controller support + if it is available on your Microchip PIC32 platform. + config USB_MUSB_SUNXI bool "Enable sunxi OTG / DRC USB controller" depends on ARCH_SUNXI diff --git a/drivers/usb/musb-new/Makefile b/drivers/usb/musb-new/Makefile index 072d516..df1c3c8 100644 --- a/drivers/usb/musb-new/Makefile +++ b/drivers/usb/musb-new/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_USB_MUSB_HOST) += musb_host.o musb_core.o musb_uboot.o obj-$(CONFIG_USB_MUSB_DSPS) += musb_dsps.o obj-$(CONFIG_USB_MUSB_AM35X) += am35x.o obj-$(CONFIG_USB_MUSB_OMAP2PLUS) += omap2430.o +obj-$(CONFIG_USB_MUSB_PIC32) += pic32.o obj-$(CONFIG_USB_MUSB_SUNXI) += sunxi.o

ccflags-y := $(call cc-option,-Wno-unused-variable) \ diff --git a/drivers/usb/musb-new/musb_core.c b/drivers/usb/musb-new/musb_core.c index a6d6af6..dd0443c 100644 --- a/drivers/usb/musb-new/musb_core.c +++ b/drivers/usb/musb-new/musb_core.c @@ -259,7 +259,7 @@ void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src) } }

-#if !defined(CONFIG_USB_MUSB_AM35X) +#if !defined(CONFIG_USB_MUSB_AM35X) && !defined(CONFIG_USB_MUSB_PIC32) /* * Unload an endpoint's FIFO */ diff --git a/drivers/usb/musb-new/pic32.c b/drivers/usb/musb-new/pic32.c new file mode 100644 index 0000000..c888c64 --- /dev/null +++ b/drivers/usb/musb-new/pic32.c @@ -0,0 +1,288 @@ +/* + * Microchip PIC32 MUSB "glue layer" + * + * Copyright (C) 2015, Microchip Technology Inc. + * Cristian Birsan cristian.birsan@microchip.com + * Purna Chandra Mandal purna.mandal@microchip.com + * + * SPDX-License-Identifier: GPL-2.0+ + * + * Based on the dsps "glue layer" code. + */ + +#include <common.h> +#include <linux/usb/musb.h> +#include "linux-compat.h" +#include "musb_core.h" +#include "musb_uboot.h" + +DECLARE_GLOBAL_DATA_PTR; + +#define PIC32_TX_EP_MASK 0x0f /* EP0 + 7 Tx EPs */ +#define PIC32_RX_EP_MASK 0x0e /* 7 Rx EPs */ + +#define MUSB_SOFTRST 0x7f +#define MUSB_SOFTRST_NRST BIT(0) +#define MUSB_SOFTRST_NRSTX BIT(1) + +#define USBCRCON 0 +#define USBCRCON_USBWKUPEN BIT(0) /* Enable Wakeup Interrupt */ +#define USBCRCON_USBRIE BIT(1) /* Enable Remote resume Interrupt */ +#define USBCRCON_USBIE BIT(2) /* Enable USB General interrupt */ +#define USBCRCON_SENDMONEN BIT(3) /* Enable Session End VBUS monitoring */ +#define USBCRCON_BSVALMONEN BIT(4) /* Enable B-Device VBUS monitoring */ +#define USBCRCON_ASVALMONEN BIT(5) /* Enable A-Device VBUS monitoring */ +#define USBCRCON_VBUSMONEN BIT(6) /* Enable VBUS monitoring */ +#define USBCRCON_PHYIDEN BIT(7) /* PHY ID monitoring enable */ +#define USBCRCON_USBIDVAL BIT(8) /* USB ID value */ +#define USBCRCON_USBIDOVEN BIT(9) /* USB ID override enable */ +#define USBCRCON_USBWK BIT(24) /* USB Wakeup Status */ +#define USBCRCON_USBRF BIT(25) /* USB Resume Status */ +#define USBCRCON_USBIF BIT(26) /* USB General Interrupt Status */ + +/* PIC32 controller data */ +struct pic32_musb_data { + struct musb_host_data mdata; + struct device dev; + void __iomem *musb_glue; +}; + +#define to_pic32_musb_data(d) \ + container_of(d, struct pic32_musb_data, dev) + +static void pic32_musb_disable(struct musb *musb) +{ + /* no way to shut the controller */ +} + +static int pic32_musb_enable(struct musb *musb) +{ + /* soft reset by NRSTx */ + musb_writeb(musb->mregs, MUSB_SOFTRST, MUSB_SOFTRST_NRSTX); + /* set mode */ + musb_platform_set_mode(musb, musb->board_mode); + + return 0; +} + +static irqreturn_t pic32_interrupt(int irq, void *hci) +{ + struct musb *musb = hci; + irqreturn_t ret = IRQ_NONE; + u32 epintr, usbintr; + + /* ack usb core interrupts */ + musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB); + if (musb->int_usb) + musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb); + + /* ack endpoint interrupts */ + musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX) & PIC32_RX_EP_MASK; + if (musb->int_rx) + musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx); + + musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX) & PIC32_TX_EP_MASK; + if (musb->int_tx) + musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx); + + /* drop spurious RX and TX if device is disconnected */ + if (musb->int_usb & MUSB_INTR_DISCONNECT) { + musb->int_tx = 0; + musb->int_rx = 0; + } + + if (musb->int_tx || musb->int_rx || musb->int_usb) + ret = musb_interrupt(musb); + + return ret; +} + +static int pic32_musb_set_mode(struct musb *musb, u8 mode) +{ + struct device *dev = musb->controller; + struct pic32_musb_data *pdata = to_pic32_musb_data(dev); + + switch (mode) { + case MUSB_HOST: + clrsetbits_le32(pdata->musb_glue + USBCRCON, + USBCRCON_USBIDVAL, USBCRCON_USBIDOVEN); + break; + case MUSB_PERIPHERAL: + setbits_le32(pdata->musb_glue + USBCRCON, + USBCRCON_USBIDVAL | USBCRCON_USBIDOVEN); + break; + case MUSB_OTG: + dev_err(dev, "support for OTG is unimplemented\n"); + break; + default: + dev_err(dev, "unsupported mode %d\n", mode); + return -EINVAL; + } + + return 0; +} + +static int pic32_musb_init(struct musb *musb) +{ + struct pic32_musb_data *pdata = to_pic32_musb_data(musb->controller); + u32 ctrl, hwvers; + u8 power; + + /* Returns zero if not clocked */ + hwvers = musb_read_hwvers(musb->mregs); + if (!hwvers) + return -ENODEV; + + /* Reset the musb */ + power = musb_readb(musb->mregs, MUSB_POWER); + power = power | MUSB_POWER_RESET; + musb_writeb(musb->mregs, MUSB_POWER, power); + mdelay(100); + + /* Start the on-chip PHY and its PLL. */ + power = power & ~MUSB_POWER_RESET; + musb_writeb(musb->mregs, MUSB_POWER, power); + + musb->isr = pic32_interrupt; + + ctrl = USBCRCON_USBIF | USBCRCON_USBRF | + USBCRCON_USBWK | USBCRCON_USBIDOVEN | + USBCRCON_PHYIDEN | USBCRCON_USBIE | + USBCRCON_USBRIE | USBCRCON_USBWKUPEN | + USBCRCON_VBUSMONEN; + writel(ctrl, pdata->musb_glue + USBCRCON); + + return 0; +} + +/* PIC32 supports only 32bit read operation */ +void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst) +{ + void __iomem *fifo = hw_ep->fifo; + u32 val, rem = len % 4; + + /* USB stack ensures dst is always 32bit aligned. */ + readsl(fifo, dst, len / 4); + if (rem) { + dst += len & ~0x03; + val = musb_readl(fifo, 0); + memcpy(dst, &val, rem); + } +} + +const struct musb_platform_ops pic32_musb_ops = { + .init = pic32_musb_init, + .set_mode = pic32_musb_set_mode, + .disable = pic32_musb_disable, + .enable = pic32_musb_enable, +}; + +/* PIC32 default FIFO config - fits in 8KB */ +static struct musb_fifo_cfg pic32_musb_fifo_config[] = { + { .hw_ep_num = 1, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 1, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 2, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 2, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 3, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 3, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 4, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 4, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 5, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 5, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 6, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 6, .style = FIFO_RX, .maxpacket = 512, }, + { .hw_ep_num = 7, .style = FIFO_TX, .maxpacket = 512, }, + { .hw_ep_num = 7, .style = FIFO_RX, .maxpacket = 512, }, +}; + +static struct musb_hdrc_config pic32_musb_config = { + .fifo_cfg = pic32_musb_fifo_config, + .fifo_cfg_size = ARRAY_SIZE(pic32_musb_fifo_config), + .multipoint = 1, + .dyn_fifo = 1, + .num_eps = 8, + .ram_bits = 11, +}; + +/* PIC32 has one MUSB controller which can be host or gadget */ +static struct musb_hdrc_platform_data pic32_musb_plat = { + .mode = MUSB_HOST, + .config = &pic32_musb_config, + .power = 250, /* 500mA */ + .platform_ops = &pic32_musb_ops, +}; + +static int musb_usb_probe(struct udevice *dev) +{ + struct usb_bus_priv *priv = dev_get_uclass_priv(dev); + struct pic32_musb_data *pdata = dev_get_priv(dev); + struct musb_host_data *mdata = &pdata->mdata; + struct fdt_resource mc, glue; + void *fdt = (void *)gd->fdt_blob; + int node = dev->of_offset; + void __iomem *mregs; + int ret; + + priv->desc_before_addr = true; + + ret = fdt_get_named_resource(fdt, node, "reg", "reg-names", + "mc", &mc); + if (ret < 0) { + printf("pic32-musb: resource "mc" not found\n"); + return ret; + } + + ret = fdt_get_named_resource(fdt, node, "reg", "reg-names", + "control", &glue); + if (ret < 0) { + printf("pic32-musb: resource "control" not found\n"); + return ret; + } + + mregs = ioremap(mc.start, fdt_resource_size(&mc)); + pdata->musb_glue = ioremap(glue.start, fdt_resource_size(&glue)); + + /* init controller */ +#ifdef CONFIG_USB_MUSB_HOST + mdata->host = musb_init_controller(&pic32_musb_plat, + &pdata->dev, mregs); + if (!mdata->host) + return -EIO; + + ret = musb_lowlevel_init(mdata); +#else + pic32_musb_plat.mode = MUSB_PERIPHERAL; + ret = musb_register(&pic32_musb_plat, &pdata->dev, mregs); +#endif + if (ret == 0) + printf("PIC32 MUSB OTG\n"); + + return ret; +} + +static int musb_usb_remove(struct udevice *dev) +{ + struct pic32_musb_data *pdata = dev_get_priv(dev); + + musb_stop(pdata->mdata.host); + + return 0; +} + +static const struct udevice_id pic32_musb_ids[] = { + { .compatible = "microchip,pic32mzda-usb" }, + { } +}; + +U_BOOT_DRIVER(usb_musb) = { + .name = "pic32-musb", + .id = UCLASS_USB, + .of_match = pic32_musb_ids, + .probe = musb_usb_probe, + .remove = musb_usb_remove, +#ifdef CONFIG_USB_MUSB_HOST + .ops = &musb_usb_ops, +#endif + .platdata_auto_alloc_size = sizeof(struct usb_platdata), + .priv_auto_alloc_size = sizeof(struct pic32_musb_data), +};