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/*
* 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),
};
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