USB: musb: add Blackfin driver to MUSB framework (v2)

- replace MUSB_FIFOSIZE register to MUSB_TXCOUNT, cause no MUSB_FIFOSIZE
   register on Blackfin
- use #ifdef to replace #if defined()

Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

2 files changed, 368 insertions, 0 deletions

diff --git a/drivers/usb/musb/blackfin.c b/drivers/usb/musb/blackfin.c
new file mode 100644
index 000000000000..3fb719aecf00
--- /dev/null
+++ b/drivers/usb/musb/blackfin.c
@@ -0,0 +1,316 @@
+/*
+ * MUSB OTG controller driver for Blackfin Processors
+ *
+ * Copyright 2006-2008 Analog Devices Inc.
+ *
+ * Enter bugs at http://blackfin.uclinux.org/
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+#include <linux/gpio.h>
+#include <linux/io.h>
+
+#include <asm/cacheflush.h>
+
+#include "musb_core.h"
+#include "blackfin.h"
+
+/*
+ * Load an endpoint's FIFO
+ */
+void musb_write_fifo(struct musb_hw_ep *hw_ep, u16 len, const u8 *src)
+{
+        void __iomem *fifo = hw_ep->fifo;
+        void __iomem *epio = hw_ep->regs;
+
+        prefetch((u8 *)src);
+
+        musb_writew(epio, MUSB_TXCOUNT, len);
+
+        DBG(4, "TX ep%d fifo %p count %d buf %p, epio %p\n",
+                        hw_ep->epnum, fifo, len, src, epio);
+
+        dump_fifo_data(src, len);
+
+        if (unlikely((unsigned long)src & 0x01))
+                outsw_8(fifo, src, len & 0x01 ? (len >> 1) + 1 : len >> 1);
+        else
+                outsw(fifo, src, len & 0x01 ? (len >> 1) + 1 : len >> 1);
+}
+
+/*
+ * Unload an endpoint's FIFO
+ */
+void musb_read_fifo(struct musb_hw_ep *hw_ep, u16 len, u8 *dst)
+{
+        void __iomem *fifo = hw_ep->fifo;
+        u8 epnum = hw_ep->epnum;
+        u16 dma_reg = 0;
+        int i;
+        u16 *data;
+
+        DBG(4, "%cX ep%d fifo %p count %d buf %p\n",
+                        'R', hw_ep->epnum, fifo, len, dst);
+
+#ifdef CONFIG_BF52x
+        invalidate_dcache_range((unsigned int)dst,
+                (unsigned int)(dst + len));
+
+        /* Setup DMA address register */
+        dma_reg = (u16) ((u32) dst & 0xFFFF);
+        bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_LOW), dma_reg);
+        SSYNC();
+
+        dma_reg = (u16) (((u32) dst >> 16) & 0xFFFF);
+        bfin_write16(USB_DMA_REG(epnum, USB_DMAx_ADDR_HIGH), dma_reg);
+        SSYNC();
+
+        /* Setup DMA count register */
+        bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_LOW), len);
+        bfin_write16(USB_DMA_REG(epnum, USB_DMAx_COUNT_HIGH), 0);
+        SSYNC();
+
+        /* Enable the DMA */
+        dma_reg = (epnum << 4) | DMA_ENA | INT_ENA;
+        bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), dma_reg);
+        SSYNC();
+
+        /* Wait for compelete */
+        while (!(bfin_read_USB_DMA_INTERRUPT() & (1 << epnum)))
+                cpu_relax();
+
+        /* acknowledge dma interrupt */
+        bfin_write_USB_DMA_INTERRUPT(1 << epnum);
+        SSYNC();
+
+        /* Reset DMA */
+        bfin_write16(USB_DMA_REG(epnum, USB_DMAx_CTRL), 0);
+        SSYNC();
+#else
+        if (unlikely((unsigned long)dst & 0x01))
+                insw_8(fifo, dst, len & 0x01 ? (len >> 1) + 1 : len >> 1);
+        else
+                insw(fifo, dst, len & 0x01 ? (len >> 1) + 1 : len >> 1);
+#endif
+
+        dump_fifo_data(dst, len);
+}
+
+static irqreturn_t blackfin_interrupt(int irq, void *__hci)
+{
+        unsigned long   flags;
+        irqreturn_t     retval = IRQ_NONE;
+        struct musb     *musb = __hci;
+
+        spin_lock_irqsave(&musb->lock, flags);
+
+        musb->int_usb = musb_readb(musb->mregs, MUSB_INTRUSB);
+        musb->int_tx = musb_readw(musb->mregs, MUSB_INTRTX);
+        musb->int_rx = musb_readw(musb->mregs, MUSB_INTRRX);
+
+        if (musb->int_usb || musb->int_tx || musb->int_rx) {
+                musb_writeb(musb->mregs, MUSB_INTRUSB, musb->int_usb);
+                musb_writew(musb->mregs, MUSB_INTRTX, musb->int_tx);
+                musb_writew(musb->mregs, MUSB_INTRRX, musb->int_rx);
+                retval = musb_interrupt(musb);
+        }
+
+        spin_unlock_irqrestore(&musb->lock, flags);
+
+        /* REVISIT we sometimes get spurious IRQs on g_ep0
+         * not clear why... fall in BF54x too.
+         */
+        if (retval != IRQ_HANDLED)
+                DBG(5, "spurious?\n");
+
+        return IRQ_HANDLED;
+}
+
+static void musb_conn_timer_handler(unsigned long _musb)
+{
+        struct musb *musb = (void *)_musb;
+        unsigned long flags;
+        u16 val;
+
+        spin_lock_irqsave(&musb->lock, flags);
+        switch (musb->xceiv.state) {
+        case OTG_STATE_A_IDLE:
+        case OTG_STATE_A_WAIT_BCON:
+                /* Start a new session */
+                val = musb_readw(musb->mregs, MUSB_DEVCTL);
+                val |= MUSB_DEVCTL_SESSION;
+                musb_writew(musb->mregs, MUSB_DEVCTL, val);
+
+                val = musb_readw(musb->mregs, MUSB_DEVCTL);
+                if (!(val & MUSB_DEVCTL_BDEVICE)) {
+                        gpio_set_value(musb->config->gpio_vrsel, 1);
+                        musb->xceiv.state = OTG_STATE_A_WAIT_BCON;
+                } else {
+                        gpio_set_value(musb->config->gpio_vrsel, 0);
+
+                        /* Ignore VBUSERROR and SUSPEND IRQ */
+                        val = musb_readb(musb->mregs, MUSB_INTRUSBE);
+                        val &= ~MUSB_INTR_VBUSERROR;
+                        musb_writeb(musb->mregs, MUSB_INTRUSBE, val);
+
+                        val = MUSB_INTR_SUSPEND | MUSB_INTR_VBUSERROR;
+                        musb_writeb(musb->mregs, MUSB_INTRUSB, val);
+
+                        val = MUSB_POWER_HSENAB;
+                        musb_writeb(musb->mregs, MUSB_POWER, val);
+                }
+                mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
+                break;
+
+        default:
+                DBG(1, "%s state not handled\n", otg_state_string(musb));
+                break;
+        }
+        spin_unlock_irqrestore(&musb->lock, flags);
+
+        DBG(4, "state is %s\n", otg_state_string(musb));
+}
+
+void musb_platform_enable(struct musb *musb)
+{
+        if (is_host_enabled(musb)) {
+                mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
+                musb->a_wait_bcon = TIMER_DELAY;
+        }
+}
+
+void musb_platform_disable(struct musb *musb)
+{
+}
+
+static void bfin_vbus_power(struct musb *musb, int is_on, int sleeping)
+{
+}
+
+static void bfin_set_vbus(struct musb *musb, int is_on)
+{
+        if (is_on)
+                gpio_set_value(musb->config->gpio_vrsel, 1);
+        else
+                gpio_set_value(musb->config->gpio_vrsel, 0);
+
+        DBG(1, "VBUS %s, devctl %02x "
+                /* otg %3x conf %08x prcm %08x */ "\n",
+                otg_state_string(musb),
+                musb_readb(musb->mregs, MUSB_DEVCTL));
+}
+
+static int bfin_set_power(struct otg_transceiver *x, unsigned mA)
+{
+        return 0;
+}
+
+void musb_platform_try_idle(struct musb *musb, unsigned long timeout)
+{
+        if (is_host_enabled(musb))
+                mod_timer(&musb_conn_timer, jiffies + TIMER_DELAY);
+}
+
+int musb_platform_get_vbus_status(struct musb *musb)
+{
+        return 0;
+}
+
+void musb_platform_set_mode(struct musb *musb, u8 musb_mode)
+{
+}
+
+int __init musb_platform_init(struct musb *musb)
+{
+
+        /*
+         * Rev 1.0 BF549 EZ-KITs require PE7 to be high for both DEVICE
+         * and OTG HOST modes, while rev 1.1 and greater require PE7 to
+         * be low for DEVICE mode and high for HOST mode. We set it high
+         * here because we are in host mode
+         */
+
+        if (gpio_request(musb->config->gpio_vrsel, "USB_VRSEL")) {
+                printk(KERN_ERR "Failed ro request USB_VRSEL GPIO_%d \n",
+                        musb->config->gpio_vrsel);
+                return -ENODEV;
+        }
+        gpio_direction_output(musb->config->gpio_vrsel, 0);
+
+        /* Anomaly #05000346 */
+        bfin_write_USB_APHY_CALIB(0x5411);
+        SSYNC();
+
+        /* Anomaly #05000347 */
+        bfin_write_USB_APHY_CNTRL(0x0);
+        SSYNC();
+
+        /* TODO
+         * Set SIC-IVG register
+         */
+
+        /* Configure PLL oscillator register */
+        bfin_write_USB_PLLOSC_CTRL(0x30a8);
+        SSYNC();
+
+        bfin_write_USB_SRP_CLKDIV((get_sclk()/1000) / 32 - 1);
+        SSYNC();
+
+        bfin_write_USB_EP_NI0_RXMAXP(64);
+        SSYNC();
+
+        bfin_write_USB_EP_NI0_TXMAXP(64);
+        SSYNC();
+
+        /* Route INTRUSB/INTR_RX/INTR_TX to USB_INT0*/
+        bfin_write_USB_GLOBINTR(0x7);
+        SSYNC();
+
+        bfin_write_USB_GLOBAL_CTL(GLOBAL_ENA | EP1_TX_ENA | EP2_TX_ENA |
+                                EP3_TX_ENA | EP4_TX_ENA | EP5_TX_ENA |
+                                EP6_TX_ENA | EP7_TX_ENA | EP1_RX_ENA |
+                                EP2_RX_ENA | EP3_RX_ENA | EP4_RX_ENA |
+                                EP5_RX_ENA | EP6_RX_ENA | EP7_RX_ENA);
+        SSYNC();
+
+        if (is_host_enabled(musb)) {
+                musb->board_set_vbus = bfin_set_vbus;
+                setup_timer(&musb_conn_timer,
+                        musb_conn_timer_handler, (unsigned long) musb);
+        }
+        if (is_peripheral_enabled(musb))
+                musb->xceiv.set_power = bfin_set_power;
+
+        musb->isr = blackfin_interrupt;
+
+        return 0;
+}
+
+int musb_platform_suspend(struct musb *musb)
+{
+        return 0;
+}
+
+int musb_platform_resume(struct musb *musb)
+{
+        return 0;
+}
+
+
+int musb_platform_exit(struct musb *musb)
+{
+
+        bfin_vbus_power(musb, 0 /*off*/, 1);
+        gpio_free(musb->config->gpio_vrsel);
+        musb_platform_suspend(musb);
+
+        return 0;
+}
diff --git a/drivers/usb/musb/blackfin.h b/drivers/usb/musb/blackfin.h
new file mode 100644
index 000000000000..a240c1e53d16
--- /dev/null
+++ b/drivers/usb/musb/blackfin.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2007 by Analog Devices, Inc.
+ *
+ * The Inventra Controller Driver for Linux is free software; you
+ * can redistribute it and/or modify it under the terms of the GNU
+ * General Public License version 2 as published by the Free Software
+ * Foundation.
+ */
+
+#ifndef __MUSB_BLACKFIN_H__
+#define __MUSB_BLACKFIN_H__
+
+/*
+ * Blackfin specific definitions
+ */
+
+#undef DUMP_FIFO_DATA
+#ifdef DUMP_FIFO_DATA
+static void dump_fifo_data(u8 *buf, u16 len)
+{
+        u8 *tmp = buf;
+        int i;
+
+        for (i = 0; i < len; i++) {
+                if (!(i % 16) && i)
+                        pr_debug("\n");
+                pr_debug("%02x ", *tmp++);
+        }
+        pr_debug("\n");
+}
+#else
+#define dump_fifo_data(buf, len)        do {} while (0)
+#endif
+
+#ifdef CONFIG_BF52x
+
+#define USB_DMA_BASE            USB_DMA_INTERRUPT
+#define USB_DMAx_CTRL           0x04
+#define USB_DMAx_ADDR_LOW       0x08
+#define USB_DMAx_ADDR_HIGH      0x0C
+#define USB_DMAx_COUNT_LOW      0x10
+#define USB_DMAx_COUNT_HIGH     0x14
+
+#define USB_DMA_REG(ep, reg)    (USB_DMA_BASE + 0x20 * ep + reg)
+#endif
+
+/* Almost 1 second */
+#define TIMER_DELAY     (1 * HZ)
+
+static struct timer_list musb_conn_timer;
+
+#endif  /* __MUSB_BLACKFIN_H__ */