[U-Boot] [PATCH v3 3/4] drivers: musb-new: Add USB DRC driver for Microchip PIC32 OTG controller.

Purna Chandra Mandal
2016-03-15T12:44:13Z

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 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 | 294 +++++++++++++++++++++++++++++++++++++++
4 files changed, 303 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..980a971
--- /dev/null
+++ b/drivers/usb/musb-new/pic32.c
@@ -0,0 +1,294 @@
+/*
+ * 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 */
+
+static void __iomem *musb_glue;
+
+/* pic32_musb_disable - disable HDRC */
+static void pic32_musb_disable(struct musb *musb)
+{
+}
+
+/* pic32_musb_enable - enable HDRC */
+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;
+
+ /* Get 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);
+
+ /* Get 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;
+
+ switch (mode) {
+ case MUSB_HOST:
+ clrsetbits_le32(musb_glue + USBCRCON,
+ USBCRCON_USBIDVAL, USBCRCON_USBIDOVEN);
+ break;
+ case MUSB_PERIPHERAL:
+ setbits_le32(musb_glue + USBCRCON,
+ USBCRCON_USBIDVAL | USBCRCON_USBIDOVEN);
+ break;
+ case MUSB_OTG:
+ dev_err(dev, "MUSB OTG mode enabled\n");
+ break;
+ default:
+ dev_err(dev, "unsupported mode %d\n", mode);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int pic32_musb_init(struct musb *musb)
+{
+ 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, 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;
+ int i;
+
+ /* Read for 32bit-aligned destination address */
+ if (likely((0x03 & (unsigned long)dst) == 0) && len >= 4) {
+ readsl(fifo, dst, len / 4);
+ dst += len & ~0x03;
+ len &= 0x03;
+ }
+
+ /*
+ * Now read the remaining 1 to 3 byte or complete length if
+ * unaligned address.
+ */
+ if (len > 4) {
+ for (i = 0; i < (len / 4); i++) {
+ *(u32 *)dst = musb_readl(fifo, 0);
+ dst += 4;
+ }
+ len &= 0x03;
+ }
+
+ if (len > 0) {
+ val = musb_readl(fifo, 0);
+ memcpy(dst, &val, len);
+ }
+}
+
+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 musb_host_data *mdata = dev_get_priv(dev);
+ 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));
+ musb_glue = ioremap(glue.start, fdt_resource_size(&glue));
+
+#ifdef CONFIG_USB_MUSB_HOST
+ /* init controller */
+ mdata->host = musb_init_controller(&pic32_musb_plat, NULL, mregs);
+ if (!mdata->host)
+ return -EIO;
+
+ ret = musb_lowlevel_init(mdata);
+#else
+ pic32_musb_plat.mode = MUSB_PERIPHERAL;
+ ret = musb_register(&pic32_musb_plat, NULL, mregs);
+#endif
+ if (ret == 0)
+ printf("PIC32 MUSB OTG\n");
+
+ return ret;
+}
+
+static int musb_usb_remove(struct udevice *dev)
+{
+ struct musb_host_data *mdata = dev_get_priv(dev);
+
+ musb_stop(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 musb_host_data),
+};
--
1.8.3.1