diff options
Diffstat (limited to 'drivers/usb/musb/blackfin.c')
| -rw-r--r-- | drivers/usb/musb/blackfin.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/drivers/usb/musb/blackfin.c b/drivers/usb/musb/blackfin.c new file mode 100644 index 00000000000..3fb719aecf0 --- /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; +} |