path: root/drivers/misc/mediatek/usb20/mt6735/usb20_phy.c

#ifdef CONFIG_MTK_LEGACY
#include <mach/mt_clkmgr.h>
#else
#include <linux/clk.h>
extern struct clk *musb_clk;            
#endif
#include <linux/jiffies.h>
#include <linux/delay.h>
#include <asm/io.h>
#include <linux/spinlock.h>
#include <linux/musb/mtk_musb.h>
#include <linux/musb/musb_core.h>
#include "usb20.h"
extern void __iomem *ap_uart0_base;

#define FRA (48)
#define PARA (28)

static void HQA_special(void){
	u8 val;
	val = USBPHY_READ8(0x18);
	DBG(0, "HQA, 0x18, before:%x\n", val);
	USBPHY_CLR8(0x18, 0x08);
	USBPHY_SET8(0x18, 0x06);
	val = USBPHY_READ8(0x18);
	DBG(0, "HQA, 0x18, after:%x\n", val);
}

#ifdef FPGA_PLATFORM
bool usb_enable_clock(bool enable)
{
	return true;
}

void usb_phy_poweron(void)
{
}

void usb_phy_savecurrent(void)
{
}

void usb_phy_recover(void)
{
}

// BC1.2
void Charger_Detect_Init(void)
{
}

void Charger_Detect_Release(void)
{
}

void usb_phy_context_save(void)
{
}

void usb_phy_context_restore(void)
{
}

#ifdef CONFIG_MTK_UART_USB_SWITCH
bool usb_phy_check_in_uart_mode()
{
	UINT8 usb_port_mode;
    usb_enable_clock(true);
    udelay(50);

	usb_port_mode = USB_PHY_Read_Register8(0x6B);
    usb_enable_clock(false);

	if ((usb_port_mode == 0x5C) ||
		(usb_port_mode == 0x5E))
		return true;
	else
		return false;
}

void usb_phy_switch_to_uart(void)
{
	int var;
#if 0
	//SW disconnect
	var = USB_PHY_Read_Register8(0x68);
	printk("[MUSB]addr: 0x68, value: %x\n", var);
	USB_PHY_Write_Register8(0x15, 0x68);
	printk("[MUSB]addr: 0x68, value after: %x\n", USB_PHY_Read_Register8(0x68));

	var = USB_PHY_Read_Register8(0x6A);
	printk("[MUSB]addr: 0x6A, value: %x\n", var);
	USB_PHY_Write_Register8(0x0, 0x6A);
	printk("[MUSB]addr: 0x6A, value after: %x\n", USB_PHY_Read_Register8(0x6A));
	//SW disconnect
#endif
	/* Set ru_uart_mode to 2'b01 */
	var = USB_PHY_Read_Register8(0x6B);
	printk("[MUSB]addr: 0x6B, value: %x\n", var);
	USB_PHY_Write_Register8(var | 0x7C, 0x6B);
	printk("[MUSB]addr: 0x6B, value after: %x\n", USB_PHY_Read_Register8(0x6B));

	/* Set RG_UART_EN to 1 */
	var = USB_PHY_Read_Register8(0x6E);
	printk("[MUSB]addr: 0x6E, value: %x\n", var);
	USB_PHY_Write_Register8(var | 0x07, 0x6E);
	printk("[MUSB]addr: 0x6E, value after: %x\n", USB_PHY_Read_Register8(0x6E));

	/* Set RG_USB20_DM_100K_EN to 1 */
	var = USB_PHY_Read_Register8(0x22);
	printk("[MUSB]addr: 0x22, value: %x\n", var);
	USB_PHY_Write_Register8(var | 0x02, 0x22);
	printk("[MUSB]addr: 0x22, value after: %x\n", USB_PHY_Read_Register8(0x22));

	var = DRV_Reg8(UART1_BASE + 0x90);
	printk("[MUSB]addr: 0x11002090 (UART1), value: %x\n", var);
	DRV_WriteReg8(UART1_BASE + 0x90, var | 0x01);
	printk("[MUSB]addr: 0x11002090 (UART1), value after: %x\n\n", DRV_Reg8(UART1_BASE + 0x90));

	//SW disconnect
	mt_usb_disconnect();
}

void usb_phy_switch_to_usb(void)
{
	int var;
	/* Set RG_UART_EN to 0 */
	var = USB_PHY_Read_Register8(0x6E);
	printk("[MUSB]addr: 0x6E, value: %x\n", var);
	USB_PHY_Write_Register8(var & ~0x01, 0x6E);
	printk("[MUSB]addr: 0x6E, value after: %x\n", USB_PHY_Read_Register8(0x6E));

	/* Set RG_USB20_DM_100K_EN to 0 */
	var = USB_PHY_Read_Register8(0x22);
	printk("[MUSB]addr: 0x22, value: %x\n", var);
	USB_PHY_Write_Register8(var & ~0x02, 0x22);
	printk("[MUSB]addr: 0x22, value after: %x\n", USB_PHY_Read_Register8(0x22));

	var = DRV_Reg8(UART1_BASE + 0x90);
	printk("[MUSB]addr: 0x11002090 (UART1), value: %x\n", var);
	DRV_WriteReg8(UART1_BASE + 0x90, var & ~0x01);
	printk("[MUSB]addr: 0x11002090 (UART1), value after: %x\n\n", DRV_Reg8(UART1_BASE + 0x90));
#if 0
	//SW connect
	var = USB_PHY_Read_Register8(0x68);
	printk("[MUSB]addr: 0x68, value: %x\n", var);
	USB_PHY_Write_Register8(0x0, 0x68);
	printk("[MUSB]addr: 0x68, value after: %x\n", USB_PHY_Read_Register8(0x68));

	var = USB_PHY_Read_Register8(0x6A);
	printk("[MUSB]addr: 0x6A, value: %x\n", var);
	USB_PHY_Write_Register8(0x0, 0x6A);
	printk("[MUSB]addr: 0x6A, value after: %x\n", USB_PHY_Read_Register8(0x6A));
	//SW connect
#endif
	//SW connect
	mt_usb_connect();
}
#endif

#else

#ifdef CONFIG_MTK_UART_USB_SWITCH
bool in_uart_mode = false;
#endif

static DEFINE_SPINLOCK(musb_reg_clock_lock);

static void enable_phy_clock(bool enable)
{
    ///* USB phy 48M clock , UNIVPLL_CON0[26] */
    //if (enable) {
    //    writel(readl((void __iomem *)UNIVPLL_CON0)|(0x04000000),
		//	   (void __iomem *)UNIVPLL_CON0);
    //} else {
    //    writel(readl((void __iomem *)UNIVPLL_CON0)&~(0x04000000),
		//	   (void __iomem *)UNIVPLL_CON0);
    //}
}

bool usb_enable_clock(bool enable)
{
	static int count = 0;
	static int real_enable = 0, real_disable = 0;
	static int virt_enable = 0, virt_disable = 0;
	bool res = TRUE;
	unsigned long flags;
	
	DBG(0, "enable(%d),count(%d),<%d,%d,%d,%d>\n", enable, count, virt_enable, virt_disable, real_enable, real_disable);

	spin_lock_irqsave(&musb_reg_clock_lock, flags);

	if (enable && count == 0) {
		real_enable++;
		enable_phy_clock(true);
#ifdef CONFIG_MTK_LEGACY
		res = enable_clock(MT_CG_PERI_USB0, "PERI_USB");
#else
		res = clk_enable(musb_clk);
#endif
	} else if (!enable && count == 1) {
		real_disable++;
#ifdef CONFIG_MTK_LEGACY
		res = disable_clock(MT_CG_PERI_USB0, "PERI_USB");
#else
		res = 0;
		clk_disable(musb_clk);
#endif
		enable_phy_clock(false);
	}

	if (enable){
		virt_enable++;
		count++;
	}else{
		virt_disable++;
		count = (count==0) ? 0 : (count-1);
	}

	spin_unlock_irqrestore(&musb_reg_clock_lock, flags);

	DBG(0, "enable(%d),count(%d),res(%d),<%d,%d,%d,%d>\n", enable, count, res, virt_enable, virt_disable, real_enable, real_disable);
	return 1;
}

static void hs_slew_rate_cal(void){
  unsigned long data;
  unsigned long x;
  unsigned char value;
  unsigned long start_time, timeout;
  unsigned int timeout_flag = 0;
  //4 s1:enable usb ring oscillator.
  USBPHY_SET8(0x15,0x80);

  //4 s2:wait 1us.
  udelay(1);

  //4 s3:enable free run clock
  USBPHY_SET8 (0xf00-0x800+0x11,0x01);
  //4 s4:setting cyclecnt.
  USBPHY_SET8 (0xf00-0x800+0x01,0x04);
  //4 s5:enable frequency meter
  USBPHY_SET8 (0xf00-0x800+0x03,0x01);

  //4 s6:wait for frequency valid.
  start_time = jiffies;
  timeout = jiffies + 3 * HZ;

  while(!(USBPHY_READ8(0xf00-0x800+0x10)&0x1)){
    if(time_after(jiffies, timeout)){
        timeout_flag = 1;
        break;
        }
    }

  //4 s7: read result.
  if(timeout_flag){
    printk("[USBPHY] Slew Rate Calibration: Timeout\n");
    value = 0x4;
    }
  else{
      data = USBPHY_READ32 (0xf00-0x800+0x0c);
      x = ((1024*FRA*PARA)/data);
      value = (unsigned char)(x/1000);
      if((x-value*1000)/100>=5)
        value += 1;
        printk("[USBPHY]slew calibration:FM_OUT =%lu,x=%lu,value=%d\n",data,x,value);
    }

  //4 s8: disable Frequency and run clock.
  USBPHY_CLR8 (0xf00-0x800+0x03,0x01);//disable frequency meter
  USBPHY_CLR8 (0xf00-0x800+0x11,0x01);//disable free run clock

  //4 s9:
#define MSK_RG_USB20_HSTX_SRCTRL 0x7
  /* all clr first then set */
  USBPHY_CLR8(0x15, MSK_RG_USB20_HSTX_SRCTRL << 4);
  USBPHY_SET8(0x15, (value & MSK_RG_USB20_HSTX_SRCTRL) << 4);

  //4 s10:disable usb ring oscillator.
  USBPHY_CLR8(0x15,0x80);
}

#ifdef CONFIG_MTK_UART_USB_SWITCH
bool usb_phy_check_in_uart_mode()
{
	UINT8 usb_port_mode;

    usb_enable_clock(true);
    udelay(50);
    usb_port_mode = USBPHY_READ8(0x6B);
    usb_enable_clock(false);

    if ((usb_port_mode == 0x5C) ||
            (usb_port_mode == 0x5E)) {
        printk("%s:%d - IN UART MODE : 0x%x\n",__func__, __LINE__, usb_port_mode);
        DBG(0,"Mask PMIC charger detection in UART mode.\n");
        pmic_chrdet_int_en(0);
        in_uart_mode=true;
    }
    else{
        printk("%s:%d - NOT IN UART MODE : 0x%x\n",__func__, __LINE__, usb_port_mode);
        in_uart_mode=false;
    }
    return in_uart_mode;
}

void usb_phy_switch_to_uart(void)
{
	if (usb_phy_check_in_uart_mode()) {
		return;
	}
        DBG(0,"Mask PMIC charger detection in UART mode.\n");
        pmic_chrdet_int_en(0);

    usb_enable_clock(true);
	udelay(50);

	/* RG_USB20_BC11_SW_EN = 1'b0 */
	USBPHY_CLR8(0x1a, 0x80);

	/* Set RG_SUSPENDM to 1 */
	USBPHY_SET8(0x68, 0x08);

	/* force suspendm = 1 */
	USBPHY_SET8(0x6a, 0x04);

	/* Set ru_uart_mode to 2'b01 */
	USBPHY_SET8(0x6B, 0x5C);

	/* Set RG_UART_EN to 1 */
	USBPHY_SET8(0x6E, 0x07);

	/* Set RG_USB20_DM_100K_EN to 1 */
	USBPHY_SET8(0x22, 0x02);
    usb_enable_clock(false);

	/* GPIO Selection */
	DRV_WriteReg32(ap_uart0_base + 0xB0, 0x1);
}


void usb_phy_switch_to_usb(void)
{
	/* GPIO Selection */
	DRV_WriteReg32(ap_uart0_base + 0xB0, 0x0);

    usb_enable_clock(true);
    udelay(50);
	/* clear force_uart_en */
	USBPHY_WRITE8(0x6B, 0x00);
    usb_enable_clock(false);
	usb_phy_poweron();
	/* disable the USB clock turned on in usb_phy_poweron() */
    usb_enable_clock(false);

        DBG(0,"Unmask PMIC charger detection in USB mode.\n");
        pmic_chrdet_int_en(1);
}
#endif

/* Denali_USB_PWR Sequence 20141030.xls */
void usb_phy_poweron(void){

#ifdef CONFIG_MTK_UART_USB_SWITCH
	if (usb_phy_check_in_uart_mode())
		return;
#endif

    // enable USB MAC clock.
    usb_enable_clock(true);

    // wait 50 usec for PHY3.3v/1.8v stable.
    udelay(50);

	// force_uart_en, 1'b0
    USBPHY_CLR8(0x6b, 0x04);
	// RG_UART_EN, 1'b0
    USBPHY_CLR8(0x6e, 0x01);
	// rg_usb20_gpio_ctl, 1'b0, usb20_gpio_mode, 1'b0
    USBPHY_CLR8(0x21, 0x03);

    //RG_USB20_BC11_SW_EN, 1'b0
    USBPHY_CLR8(0x1a, 0x80);

	// rg_usb20_dp_100k_mode, 1'b1
    USBPHY_SET8(0x22, 0x04);
    // USB20_DP_100K_EN 1'b0, RG_USB20_DM_100K_EN, 1'b0
    USBPHY_CLR8(0x22, 0x03);

    // RG_USB20_OTG_VBUSCMP_EN, 1'b1
    USBPHY_SET8(0x1a, 0x10);

    // force_suspendm, 1'b0
    USBPHY_CLR8(0x6a, 0x04);

    //7 s7: wait for 800 usec.
    udelay(800);

    // force enter device mode, from K2, FIXME
    USBPHY_CLR8(0x6c, 0x10);
    USBPHY_SET8(0x6c, 0x2F);
    USBPHY_SET8(0x6d, 0x3F);

    printk("usb power on success\n");
}

#ifdef CONFIG_MTK_UART_USB_SWITCH
static bool skipDisableUartMode = true;
#endif

/* Denali_USB_PWR Sequence 20141030.xls */
static void usb_phy_savecurrent_internal(void){

    //4 1. swtich to USB function. (system register, force ip into usb mode.

#ifdef CONFIG_MTK_UART_USB_SWITCH
	if (!usb_phy_check_in_uart_mode()) {
		// enable USB MAC clock.
		usb_enable_clock(true);

		// wait 50 usec for PHY3.3v/1.8v stable.
		udelay(50);

		// force_uart_en, 1'b0
		USBPHY_CLR8(0x6b, 0x04);
		// RG_UART_EN, 1'b0
		USBPHY_CLR8(0x6e, 0x01);
		// rg_usb20_gpio_ctl, 1'b0, usb20_gpio_mode, 1'b0
		USBPHY_CLR8(0x21, 0x03);

		// RG_USB20_BC11_SW_EN, 1'b0
		USBPHY_CLR8(0x1a, 0x80);
		// RG_USB20_OTG_VBUSCMP_EN, 1'b0
		USBPHY_CLR8(0x1a, 0x10);

		// RG_SUSPENDM, 1'b1 
		USBPHY_SET8(0x68, 0x08);
		// force_suspendm, 1'b1
		USBPHY_SET8(0x6a, 0x04);
		
		usb_enable_clock(false);
	} else {
		if (skipDisableUartMode)
			skipDisableUartMode = false;
		else
			return;
	}
#else
	// force_uart_en, 1'b0
	USBPHY_CLR8(0x6b, 0x04);
	// RG_UART_EN, 1'b0
	USBPHY_CLR8(0x6e, 0x01);
	// rg_usb20_gpio_ctl, 1'b0, usb20_gpio_mode, 1'b0
	USBPHY_CLR8(0x21, 0x03);

	// RG_USB20_BC11_SW_EN, 1'b0
	USBPHY_CLR8(0x1a, 0x80);
	// RG_USB20_OTG_VBUSCMP_EN, 1'b0
	USBPHY_CLR8(0x1a, 0x10);

	// RG_SUSPENDM, 1'b1 
	USBPHY_SET8(0x68, 0x08);
	// force_suspendm, 1'b1
	USBPHY_SET8(0x6a, 0x04);
#endif

    // RG_DPPULLDOWN, 1'b1, RG_DMPULLDOWN, 1'b1
    USBPHY_SET8(0x68, 0xc0);
    // RG_XCVRSEL[1:0], 2'b01.
    USBPHY_CLR8(0x68, 0x20);
    USBPHY_SET8(0x68, 0x10);
    // RG_TERMSEL, 1'b1
	USBPHY_SET8(0x68, 0x04);
    // RG_DATAIN[3:0], 4'b0000
	USBPHY_CLR8(0x69, 0x3c);

    // force_dp_pulldown, 1'b1, force_dm_pulldown, 1'b1, force_xcversel, 1'b1, force_termsel, 1'b1, force_datain, 1'b1
    USBPHY_SET8(0x6a, 0xba);

    udelay(800);

    // RG_SUSPENDM, 1'b0 
    USBPHY_CLR8(0x68, 0x08);

	//ALPS00427972, implement the analog register formula
	// printk("%s: USBPHY_READ8(0x05) = 0x%x \n", __func__, USBPHY_READ8(0x05));
	// printk("%s: USBPHY_READ8(0x07) = 0x%x \n", __func__, USBPHY_READ8(0x07));
	//ALPS00427972, implement the analog register formula

    udelay(1);

    // force enter device mode, from K2, FIXME
	// force enter device mode
	// USBPHY_CLR8(0x6c, 0x10);
	// USBPHY_SET8(0x6c, 0x2E);
	// USBPHY_SET8(0x6d, 0x3E);
        
#ifdef CONFIG_MTK_UART_USB_SWITCH
    if (in_uart_mode) {
        USBPHY_SET8(0x68, 0x08);
        printk("%s:%d - SWITCH to UART MODE after savecurrent!\n", __func__, __LINE__);
    }
#endif    
}

void usb_phy_savecurrent(void){

	/* to avoid hw acess during clock-off */
	unsigned long flags;
	int do_lock;
	extern int musb_is_shutting;

	do_lock = 0;

	usb_phy_savecurrent_internal();

	/* to avoid deadlock, musb_shutdown will hold this clock too */	
	if (mtk_musb && !musb_is_shutting) {
		spin_lock_irqsave(&mtk_musb->lock, flags);
		do_lock = 1;
	}

	/* 4 14. turn off internal 48Mhz PLL. */
	usb_enable_clock(false);

	if (do_lock) {
		spin_unlock_irqrestore(&mtk_musb->lock, flags);
	}

	printk("usb save current success\n");
}

/* Denali_USB_PWR Sequence 20141030.xls */
void usb_phy_recover(void){

	/* to avoid hw acess during clock-on */
	unsigned long flags;
	int do_lock;

	do_lock = 0;

	if (mtk_musb) {
		spin_lock_irqsave(&mtk_musb->lock, flags);
		do_lock = 1;
	}

	// turn on USB reference clock.
	usb_enable_clock(true);

	if (do_lock) {
		spin_unlock_irqrestore(&mtk_musb->lock, flags);
	}

	// wait 50 usec.
	udelay(50);

#ifdef CONFIG_MTK_UART_USB_SWITCH
	if (!usb_phy_check_in_uart_mode()) {
		// clean PUPD_BIST_EN
		// PUPD_BIST_EN = 1'b0
		// PMIC will use it to detect charger type
		USBPHY_CLR8(0x1d, 0x10);

		// force_uart_en, 1'b0
		USBPHY_CLR8(0x6b, 0x04);
		// RG_UART_EN, 1'b0
		USBPHY_CLR8(0x6e, 0x01);
		// rg_usb20_gpio_ctl, 1'b0, usb20_gpio_mode, 1'b0
		USBPHY_CLR8(0x21, 0x03);

		// force_suspendm, 1'b0
		USBPHY_CLR8(0x6a, 0x04);

		skipDisableUartMode = false;
	} else {
		if (!skipDisableUartMode)
			return;
	}
#else

	// clean PUPD_BIST_EN
	// PUPD_BIST_EN = 1'b0
	// PMIC will use it to detect charger type
	USBPHY_CLR8(0x1d, 0x10);

	// force_uart_en, 1'b0
	USBPHY_CLR8(0x6b, 0x04);
	// RG_UART_EN, 1'b0
	USBPHY_CLR8(0x6e, 0x01);
	// rg_usb20_gpio_ctl, 1'b0, usb20_gpio_mode, 1'b0
	USBPHY_CLR8(0x21, 0x03);

	// force_suspendm, 1'b0
	USBPHY_CLR8(0x6a, 0x04);
#endif

    // RG_DPPULLDOWN, 1'b0, RG_DMPULLDOWN, 1'b0
    USBPHY_CLR8(0x68, 0xc0);
    // RG_XCVRSEL[1:0], 2'b00.
    USBPHY_CLR8(0x68, 0x30);
    // RG_TERMSEL, 1'b0
	USBPHY_CLR8(0x68, 0x04);
    // RG_DATAIN[3:0], 4'b0000
	USBPHY_CLR8(0x69, 0x3c);

    // force_dp_pulldown, 1'b0, force_dm_pulldown, 1'b0, force_xcversel, 1'b0, force_termsel, 1'b0, force_datain, 1'b0
    USBPHY_CLR8(0x6a, 0xba);

	// RG_USB20_BC11_SW_EN, 1'b0
    USBPHY_CLR8(0x1a, 0x80);
    // RG_USB20_OTG_VBUSCMP_EN, 1'b1
    USBPHY_SET8(0x1a, 0x10);


    // wait 800 usec.
    udelay(800);

    // force enter device mode, from K2, FIXME
    USBPHY_CLR8(0x6c, 0x10);
    USBPHY_SET8(0x6c, 0x2F);
    USBPHY_SET8(0x6d, 0x3F);

    // from K2, FIXME
#if defined(MTK_HDMI_SUPPORT)
	USBPHY_SET8(0x05, 0x05);
	USBPHY_SET8(0x05, 0x50);
#endif
#ifdef MEIZU_M81
	USBPHY_SET8(0x05,0x77);
#endif
	/* adjustment after HQA */
	HQA_special();

    hs_slew_rate_cal();

    printk("usb recovery success\n");
    return;
}

// BC1.2
void Charger_Detect_Init(void)
{
    //turn on USB reference clock.
    usb_enable_clock(true);
    //wait 50 usec.
    udelay(50);
    /* RG_USB20_BC11_SW_EN = 1'b1 */
    USBPHY_SET8(0x1a, 0x80);
    printk("Charger_Detect_Init\n");
}

void Charger_Detect_Release(void)
{
    /* RG_USB20_BC11_SW_EN = 1'b0 */
    USBPHY_CLR8(0x1a, 0x80);
    udelay(1);
    //4 14. turn off internal 48Mhz PLL.
    usb_enable_clock(false);
    printk("Charger_Detect_Release\n");
}

void usb_phy_context_save(void)
{
#ifdef CONFIG_MTK_UART_USB_SWITCH
	in_uart_mode = usb_phy_check_in_uart_mode();
#endif
}

void usb_phy_context_restore(void)
{
#ifdef CONFIG_MTK_UART_USB_SWITCH
	if (in_uart_mode) {
		usb_phy_switch_to_uart();
	}
#endif
    usb_phy_savecurrent_internal();
}

#endif