Release 4.11 arch/arm/mach-davinci/usb-da8xx.c
/*
* DA8xx USB
*/
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/mfd/da8xx-cfgchip.h>
#include <linux/phy/phy.h>
#include <linux/platform_data/usb-davinci.h>
#include <linux/platform_device.h>
#include <linux/usb/musb.h>
#include <mach/clock.h>
#include <mach/common.h>
#include <mach/cputype.h>
#include <mach/da8xx.h>
#include <mach/irqs.h>
#include "clock.h"
#define DA8XX_USB0_BASE 0x01e00000
#define DA8XX_USB1_BASE 0x01e25000
static struct clk *usb20_clk;
static struct platform_device da8xx_usb_phy = {
.name = "da8xx-usb-phy",
.id = -1,
.dev = {
/*
* Setting init_name so that clock lookup will work in
* da8xx_register_usb11_phy_clk() even if this device is not
* registered yet.
*/
.init_name = "da8xx-usb-phy",
},
};
int __init da8xx_register_usb_phy(void)
{
return platform_device_register(&da8xx_usb_phy);
}
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static struct musb_hdrc_config musb_config = {
.multipoint = true,
.num_eps = 5,
.ram_bits = 10,
};
static struct musb_hdrc_platform_data usb_data = {
/* OTG requires a Mini-AB connector */
.mode = MUSB_OTG,
.clock = "usb20",
.config = &musb_config,
};
static struct resource da8xx_usb20_resources[] = {
{
.start = DA8XX_USB0_BASE,
.end = DA8XX_USB0_BASE + SZ_64K - 1,
.flags = IORESOURCE_MEM,
},
{
.start = IRQ_DA8XX_USB_INT,
.flags = IORESOURCE_IRQ,
.name = "mc",
},
};
static u64 usb_dmamask = DMA_BIT_MASK(32);
static struct platform_device da8xx_usb20_dev = {
.name = "musb-da8xx",
.id = -1,
.dev = {
/*
* Setting init_name so that clock lookup will work in
* usb20_phy_clk_enable() even if this device is not registered.
*/
.init_name = "musb-da8xx",
.platform_data = &usb_data,
.dma_mask = &usb_dmamask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.resource = da8xx_usb20_resources,
.num_resources = ARRAY_SIZE(da8xx_usb20_resources),
};
int __init da8xx_register_usb20(unsigned int mA, unsigned int potpgt)
{
usb_data.power = mA > 510 ? 255 : mA / 2;
usb_data.potpgt = (potpgt + 1) / 2;
return platform_device_register(&da8xx_usb20_dev);
}
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static struct resource da8xx_usb11_resources[] = {
[0] = {
.start = DA8XX_USB1_BASE,
.end = DA8XX_USB1_BASE + SZ_4K - 1,
.flags = IORESOURCE_MEM,
},
[1] = {
.start = IRQ_DA8XX_IRQN,
.end = IRQ_DA8XX_IRQN,
.flags = IORESOURCE_IRQ,
},
};
static u64 da8xx_usb11_dma_mask = DMA_BIT_MASK(32);
static struct platform_device da8xx_usb11_device = {
.name = "ohci-da8xx",
.id = -1,
.dev = {
.dma_mask = &da8xx_usb11_dma_mask,
.coherent_dma_mask = DMA_BIT_MASK(32),
},
.num_resources = ARRAY_SIZE(da8xx_usb11_resources),
.resource = da8xx_usb11_resources,
};
int __init da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata)
{
da8xx_usb11_device.dev.platform_data = pdata;
return platform_device_register(&da8xx_usb11_device);
}
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static struct clk usb_refclkin = {
.name = "usb_refclkin",
.set_rate = davinci_simple_set_rate,
};
static struct clk_lookup usb_refclkin_lookup =
CLK(NULL, "usb_refclkin", &usb_refclkin);
/**
* da8xx_register_usb_refclkin - register USB_REFCLKIN clock
*
* @rate: The clock rate in Hz
*
* This clock is only needed if the board provides an external USB_REFCLKIN
* signal, in which case it will be used as the parent of usb20_phy_clk and/or
* usb11_phy_clk.
*/
int __init da8xx_register_usb_refclkin(int rate)
{
int ret;
usb_refclkin.rate = rate;
ret = clk_register(&usb_refclkin);
if (ret)
return ret;
clkdev_add(&usb_refclkin_lookup);
return 0;
}
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static void usb20_phy_clk_enable(struct clk *clk)
{
u32 val;
u32 timeout = 500000; /* 500 msec */
val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
/* The USB 2.O PLL requires that the USB 2.O PSC is enabled as well. */
davinci_clk_enable(usb20_clk);
/*
* Turn on the USB 2.0 PHY, but just the PLL, and not OTG. The USB 1.1
* host may use the PLL clock without USB 2.0 OTG being used.
*/
val &= ~(CFGCHIP2_RESET | CFGCHIP2_PHYPWRDN);
val |= CFGCHIP2_PHY_PLLON;
writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
while (--timeout) {
val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
if (val & CFGCHIP2_PHYCLKGD)
goto done;
udelay(1);
}
pr_err("Timeout waiting for USB 2.0 PHY clock good\n");
done:
davinci_clk_disable(usb20_clk);
}
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static void usb20_phy_clk_disable(struct clk *clk)
{
u32 val;
val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
val |= CFGCHIP2_PHYPWRDN;
writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
}
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static int usb20_phy_clk_set_parent(struct clk *clk, struct clk *parent)
{
u32 val;
val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
/* Set the mux depending on the parent clock. */
if (parent == &usb_refclkin) {
val &= ~CFGCHIP2_USB2PHYCLKMUX;
} else if (strcmp(parent->name, "pll0_aux_clk") == 0) {
val |= CFGCHIP2_USB2PHYCLKMUX;
} else {
pr_err("Bad parent on USB 2.0 PHY clock\n");
return -EINVAL;
}
/* reference frequency also comes from parent clock */
val &= ~CFGCHIP2_REFFREQ_MASK;
switch (clk_get_rate(parent)) {
case 12000000:
val |= CFGCHIP2_REFFREQ_12MHZ;
break;
case 13000000:
val |= CFGCHIP2_REFFREQ_13MHZ;
break;
case 19200000:
val |= CFGCHIP2_REFFREQ_19_2MHZ;
break;
case 20000000:
val |= CFGCHIP2_REFFREQ_20MHZ;
break;
case 24000000:
val |= CFGCHIP2_REFFREQ_24MHZ;
break;
case 26000000:
val |= CFGCHIP2_REFFREQ_26MHZ;
break;
case 38400000:
val |= CFGCHIP2_REFFREQ_38_4MHZ;
break;
case 40000000:
val |= CFGCHIP2_REFFREQ_40MHZ;
break;
case 48000000:
val |= CFGCHIP2_REFFREQ_48MHZ;
break;
default:
pr_err("Bad parent clock rate on USB 2.0 PHY clock\n");
return -EINVAL;
}
writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
return 0;
}
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static struct clk usb20_phy_clk = {
.name = "usb20_phy",
.clk_enable = usb20_phy_clk_enable,
.clk_disable = usb20_phy_clk_disable,
.set_parent = usb20_phy_clk_set_parent,
};
static struct clk_lookup usb20_phy_clk_lookup =
CLK("da8xx-usb-phy", "usb20_phy", &usb20_phy_clk);
/**
* da8xx_register_usb20_phy_clk - register USB0PHYCLKMUX clock
*
* @use_usb_refclkin: Selects the parent clock - either "usb_refclkin" if true
* or "pll0_aux" if false.
*/
int __init da8xx_register_usb20_phy_clk(bool use_usb_refclkin)
{
struct clk *parent;
int ret;
usb20_clk = clk_get(&da8xx_usb20_dev.dev, "usb20");
ret = PTR_ERR_OR_ZERO(usb20_clk);
if (ret)
return ret;
parent = clk_get(NULL, use_usb_refclkin ? "usb_refclkin" : "pll0_aux");
ret = PTR_ERR_OR_ZERO(parent);
if (ret) {
clk_put(usb20_clk);
return ret;
}
usb20_phy_clk.parent = parent;
ret = clk_register(&usb20_phy_clk);
if (!ret)
clkdev_add(&usb20_phy_clk_lookup);
clk_put(parent);
return ret;
}
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static int usb11_phy_clk_set_parent(struct clk *clk, struct clk *parent)
{
u32 val;
val = readl(DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
/* Set the USB 1.1 PHY clock mux based on the parent clock. */
if (parent == &usb20_phy_clk) {
val &= ~CFGCHIP2_USB1PHYCLKMUX;
} else if (parent == &usb_refclkin) {
val |= CFGCHIP2_USB1PHYCLKMUX;
} else {
pr_err("Bad parent on USB 1.1 PHY clock\n");
return -EINVAL;
}
writel(val, DA8XX_SYSCFG0_VIRT(DA8XX_CFGCHIP2_REG));
return 0;
}
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static struct clk usb11_phy_clk = {
.name = "usb11_phy",
.set_parent = usb11_phy_clk_set_parent,
};
static struct clk_lookup usb11_phy_clk_lookup =
CLK("da8xx-usb-phy", "usb11_phy", &usb11_phy_clk);
/**
* da8xx_register_usb11_phy_clk - register USB1PHYCLKMUX clock
*
* @use_usb_refclkin: Selects the parent clock - either "usb_refclkin" if true
* or "usb20_phy" if false.
*/
int __init da8xx_register_usb11_phy_clk(bool use_usb_refclkin)
{
struct clk *parent;
int ret = 0;
if (use_usb_refclkin)
parent = clk_get(NULL, "usb_refclkin");
else
parent = clk_get(&da8xx_usb_phy.dev, "usb20_phy");
if (IS_ERR(parent))
return PTR_ERR(parent);
usb11_phy_clk.parent = parent;
ret = clk_register(&usb11_phy_clk);
if (!ret)
clkdev_add(&usb11_phy_clk_lookup);
clk_put(parent);
return ret;
}
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