ohci-omap.c

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/*
 * OHCI HCD (Host Controller Driver) for USB.
 *
 * (C) Copyright 1999 Roman Weissgaerber <[e-mail]>
 * (C) Copyright 2000-2002 David Brownell <[e-mail]>
 * (C) Copyright 2002 Hewlett-Packard Company
 * 
 * OMAP Bus Glue
 *
 * Written by Christopher Hoover <[e-mail]>
 * Based on fragments of previous driver by Rusell King et al.
 *
 * Modified for OMAP from ohci-sa1111.c by Tony Lindgren <[e-mail]>
 * Based on the 2.4 OMAP OHCI driver originally done by MontaVista Software Inc.
 *
 * This file is licenced under the GPL.
 */
 
#include <asm/hardware.h>
#include <asm/io.h>

#include <asm/arch/bus.h>
#include <asm/arch/hardware.h>
#include <asm/arch/mux.h>
#include <asm/arch/irqs.h>

#include "ohci-omap.h"

#ifndef CONFIG_ARCH_OMAP
#error "This file is OMAP bus glue.  CONFIG_OMAP must be defined."
#endif

extern int usb_disabled(void);
extern int ocpi_enable(void);

/*
 * Use the first port only by default. Override with hmc_mode option.
 *
 * NOTE: Many OMAP-1510 Innovators supposedly have bad wiring for the USB ports
 *       1 & 2, so only port 0 will work. To use the OHCI on the first port, use 
 *       the Innovator USB client cable with a client-to-client connector and modify
 *       either the cable or the hub to feed 5V VBUS back to Innovator. VBUS should
 *       be the red lead in the cable.
 *
 *       To mount USB hard disk as root, see the patch for do_mounts.c that tries 
 *       remounting the root, and use root=0801 if your root is on sda1. Does not 
 *       work with devfs.
 */
static int default_hmc_mode = 16;
static int hmc_mode = 1234;

/*
 * Set the USB host pin multiplexing and the selected HMC mode
 */
static int omap_usb_set_hmc_mode(int hmc_mode)
{
	unsigned int val;

	switch (hmc_mode) {
	case 0:
		/* 0: function, 1: disabled, 2: disabled */
		omap_cfg_reg(W4_USB_PUEN);
		omap_cfg_reg(R18_1510_USB_GPIO0);
		break;
	case 4:
		/* 0: function 1: host 2: host */
		omap_cfg_reg(usb1_speed);
		omap_cfg_reg(usb1_susp);
		omap_cfg_reg(usb1_seo);
		omap_cfg_reg(usb1_txen);
		omap_cfg_reg(usb1_txd);
		omap_cfg_reg(usb1_vp);
		omap_cfg_reg(usb1_vm);
		omap_cfg_reg(usb1_rcv);
		omap_cfg_reg(usb2_susp);
		omap_cfg_reg(usb2_seo);
		omap_cfg_reg(usb2_txen);
		omap_cfg_reg(usb2_txd);
		omap_cfg_reg(usb2_vp);
		omap_cfg_reg(usb2_vm);
		omap_cfg_reg(usb2_rcv);
		break;
	case 16:
		/* 0: host, 1: disabled, 2: disabled */
		omap_cfg_reg(W9_USB0_TXEN);
		omap_cfg_reg(AA9_USB0_VP);
		omap_cfg_reg(Y5_USB0_RCV);
		omap_cfg_reg(R9_USB0_VM);
		omap_cfg_reg(V6_USB0_TXD);
		omap_cfg_reg(W5_USB0_SE0);
		break;
	default:
		printk("Unknown USB host configuration: %i\n", hmc_mode);
		return -ENODEV;
	}

	/* Write the selected HMC mode */
	val = readl(MOD_CONF_CTRL_0) & ~HMC_CLEAR;
	val |= (hmc_mode << 1);
	writel(val, MOD_CONF_CTRL_0);

	return 0;
}

/*
 * OHCI clock initialization for OMAP-1510 and 1610
 */
static int omap_ohci_clock_power(int on)
{
	if (on) {
		if (cpu_is_omap_1510()) {
			/* Use DPLL, not APLL */
			writel(readl(ULPD_APLL_CTRL_REG) & ~APLL_NDPLL_SWITCH,
			       ULPD_APLL_CTRL_REG);

			/* Enable DPLL */
			writel(readl(ULPD_DPLL_CTRL_REG) | DPLL_PLL_ENABLE,
			       ULPD_DPLL_CTRL_REG);

			/* Software request for USB 48MHz clock */
			writel(readl(ULPD_SOFT_REQ_REG) | SOFT_REQ_REG_REQ,
			       ULPD_SOFT_REQ_REG);

			while (!(readl(ULPD_DPLL_CTRL_REG) & DPLL_LOCK));
		}

		if (cpu_is_omap_1610()) {
			/* Enable OHCI */
			writel(readl(ULPD_SOFT_REQ_REG) | SOFT_USB_OTG_REQ,
				ULPD_SOFT_REQ_REG);

			/* USB host clock request if not using OTG */
			writel(readl(ULPD_SOFT_REQ_REG) | SOFT_USB_REQ,
				ULPD_SOFT_REQ_REG);

			writel(readl(ULPD_STATUS_REQ_REG) | USB_HOST_DPLL_REQ,
			     ULPD_STATUS_REQ_REG);
		}

		/* Enable 48MHz clock to USB */
		writel(readl(ULPD_CLOCK_CTRL_REG) | USB_MCLK_EN,
		       ULPD_CLOCK_CTRL_REG);

		writel(readl(ARM_IDLECT2) | (1 << EN_LBFREECK) | (1 << EN_LBCK),
		       ARM_IDLECT2);

		writel(readl(MOD_CONF_CTRL_0) | USB_HOST_HHC_UHOST_EN,
		       MOD_CONF_CTRL_0);
	} else {
		/* Disable 48MHz clock to USB */
		writel(readl(ULPD_CLOCK_CTRL_REG) & ~USB_MCLK_EN,
		       ULPD_CLOCK_CTRL_REG);

		/* FIXME: The DPLL stays on for now */
	}

	return 0;
}

/*
 * Hardware specific transceiver power on/off
 */
static int omap_ohci_transceiver_power(int on)
{
	if (on) {
		if (omap_is_innovator())
			writel(readl(OMAP1510_FPGA_HOST_CTRL) | 0x20, 
			       OMAP1510_FPGA_HOST_CTRL);
	} else {
		if (omap_is_innovator())
			writel(readl(OMAP1510_FPGA_HOST_CTRL) & ~0x20, 
			       OMAP1510_FPGA_HOST_CTRL);
	}

	return 0;
}

/*
 * OMAP-1510 specific Local Bus clock on/off
 */
static int omap_1510_local_bus_power(int on)
{
	if (on) {
		writel((1 << 1) | (1 << 0), OMAP1510_LB_MMU_CTL);
		udelay(200);
	} else {
		writel(0, OMAP1510_LB_MMU_CTL);
	}

	return 0;
}

/*
 * OMAP-1510 specific Local Bus initialization
 * NOTE: This assumes 32MB memory size in OMAP1510LB_MEMSIZE.
 *       See also arch/mach-omap/memory.h for __virt_to_bus() and 
 *       __bus_to_virt() which need to match with the physical 
 *       Local Bus address below.
 */
static int omap_1510_local_bus_init(void)
{
	unsigned int tlb;
	unsigned long lbaddr, physaddr;

	writel((readl(OMAP1510_LB_CLOCK_DIV) & 0xfffffff8) | 0x4, 
	       OMAP1510_LB_CLOCK_DIV);

	/* Configure the Local Bus MMU table */
	for (tlb = 0; tlb < OMAP1510_LB_MEMSIZE; tlb++) {
		lbaddr = tlb * 0x00100000 + OMAP1510_LB_OFFSET;
		physaddr = tlb * 0x00100000 + PHYS_OFFSET;
		writel((lbaddr & 0x0fffffff) >> 22, OMAP1510_LB_MMU_CAM_H);
		writel(((lbaddr & 0x003ffc00) >> 6) | 0xc, 
		       OMAP1510_LB_MMU_CAM_L);
		writel(physaddr >> 16, OMAP1510_LB_MMU_RAM_H);
		writel((physaddr & 0x0000fc00) | 0x300, OMAP1510_LB_MMU_RAM_L);
		writel(tlb << 4, OMAP1510_LB_MMU_LCK);
		writel(0x1, OMAP1510_LB_MMU_LD_TLB);
	}

	/* Enable the walking table */
	writel(readl(OMAP1510_LB_MMU_CTL) | (1 << 3), OMAP1510_LB_MMU_CTL);
	udelay(200);

	return 0;
}

/*
 * OMAP-1610 specific hardware initialization
 *
 * Intended to configure OMAP-1610 USB host and OTG ports depending on 
 * the HMC mode selected.
 *
 * FIXME: Currently only supports alternate ping group 2 mode, should
 *        be easy to modify for other configurations once there is some
 *        hardware to test with.
 */
static int omap_1610_usb_init(int mode)
{
	u_int val = 0;

	/* Configure the OMAP transceiver settings */
	val |= (1 << 8); /* CONF_USB2_UNI TRM p 15-205*/
	val |= (4 << 4); /* TRM p 5-59, p 15-157 (1224) */

	//val |= (1 << 3); /* Isolate integrated transceiver from port 0 */
	val |= (1 << 2); /* Disable pulldown on integrated transceiver DM */
	val |= (1 << 1); /* Disable pulldown on integraded transceiver DP */

	writel(val, USB_TRANSCEIVER_CTRL);

	/* Set the USB0_TRX_MODE */
	val = 0;
	val &= ~OTG_IDLE_EN;
	val &= ~DEV_IDLE_EN;
	val &= ~(7 << 16);	/* Clear USB0_TRX_MODE */
	val |= (3 << 16);	/* 0 or 3, 6-wire DAT/SE0, TRM p 15-159 */
	writel(val, OTG_SYSCON_1);

	/* 
	 * Control via OTG, see TRM p 15-163
	 */
	val = 0;
	//val |= 1;		/* REVISIT: Enable OTG = 1 */

	/* Control via OTG */
	val &= ~HMC_PADEN;
	val &= ~OTG_PADEN;
	val |= UHOST_EN;	

	val &= ~0x3f;		/* Clear HMC mode */
	val |= mode;		/* Set HMC mode */
	val &= ~(7 << 16);	/* Clear ASE0_BRST */
	val |= (4 << 16);	/* Must be 4 */
	val |= USBX_SYNCHRO;	/* Must be set */
	val |= SRP_VBUS;
	writel(val, OTG_SYSCON_2);

	/* Enable OTG idle */
	//writel(readl(OTG_SYSCON_1) | OTG_IDLE_EN, OTG_SYSCON_1);

	return 0;
}

/*-------------------------------------------------------------------------*/

static void omap_start_hc(struct omap_dev *dev)
{
	printk(KERN_DEBUG __FILE__ 
	       ": starting OMAP OHCI USB Controller\n");

	/* 
	 * Set the HMC mode for the USB ports
	 */
#if 0
	/* See note about the Innovator wiring above */
	if (omap_is_innovator())
		hmc_mode = 4;	/* 0: function 1: host 2: host */
#endif

	if (cpu_is_omap_1610())
		ocpi_enable();

	omap_usb_set_hmc_mode(hmc_mode);

	omap_ohci_clock_power(1);
	omap_ohci_transceiver_power(1);

	if (cpu_is_omap_1510()) {
		omap_1510_local_bus_power(1);
		omap_1510_local_bus_init();
	}

	if (cpu_is_omap_1610())
		omap_1610_usb_init(hmc_mode);

	//omap_enable_device(dev);
}

static void omap_stop_hc(struct omap_dev *dev)
{
	printk(KERN_DEBUG __FILE__ 
	       ": stopping OMAP OHCI USB Controller\n");

	/*
	 * FIXME: Put the USB host controller into reset.
	 */

	/*
	 * FIXME: Stop the USB clock.
	 */
	//omap_disable_device(dev);

}