/* * Microchip PIC32 MUSB "glue layer" * * Copyright (C) 2015, Microchip Technology Inc. * Cristian Birsan * Purna Chandra Mandal * * SPDX-License-Identifier: GPL-2.0+ * * Based on the dsps "glue layer" code. */ #include #include #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), };