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-rw-r--r--arch/mips/alchemy/common/usb.c627
1 files changed, 627 insertions, 0 deletions
diff --git a/arch/mips/alchemy/common/usb.c b/arch/mips/alchemy/common/usb.c
new file mode 100644
index 000000000..5d618547e
--- /dev/null
+++ b/arch/mips/alchemy/common/usb.c
@@ -0,0 +1,627 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * USB block power/access management abstraction.
+ *
+ * Au1000+: The OHCI block control register is at the far end of the OHCI memory
+ * area. Au1550 has OHCI on different base address. No need to handle
+ * UDC here.
+ * Au1200: one register to control access and clocks to O/EHCI, UDC and OTG
+ * as well as the PHY for EHCI and UDC.
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/export.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/syscore_ops.h>
+#include <asm/cpu.h>
+#include <asm/mach-au1x00/au1000.h>
+
+/* control register offsets */
+#define AU1000_OHCICFG 0x7fffc
+#define AU1550_OHCICFG 0x07ffc
+#define AU1200_USBCFG 0x04
+
+/* Au1000 USB block config bits */
+#define USBHEN_RD (1 << 4) /* OHCI reset-done indicator */
+#define USBHEN_CE (1 << 3) /* OHCI block clock enable */
+#define USBHEN_E (1 << 2) /* OHCI block enable */
+#define USBHEN_C (1 << 1) /* OHCI block coherency bit */
+#define USBHEN_BE (1 << 0) /* OHCI Big-Endian */
+
+/* Au1200 USB config bits */
+#define USBCFG_PFEN (1 << 31) /* prefetch enable (undoc) */
+#define USBCFG_RDCOMB (1 << 30) /* read combining (undoc) */
+#define USBCFG_UNKNOWN (5 << 20) /* unknown, leave this way */
+#define USBCFG_SSD (1 << 23) /* serial short detect en */
+#define USBCFG_PPE (1 << 19) /* HS PHY PLL */
+#define USBCFG_UCE (1 << 18) /* UDC clock enable */
+#define USBCFG_ECE (1 << 17) /* EHCI clock enable */
+#define USBCFG_OCE (1 << 16) /* OHCI clock enable */
+#define USBCFG_FLA(x) (((x) & 0x3f) << 8)
+#define USBCFG_UCAM (1 << 7) /* coherent access (undoc) */
+#define USBCFG_GME (1 << 6) /* OTG mem access */
+#define USBCFG_DBE (1 << 5) /* UDC busmaster enable */
+#define USBCFG_DME (1 << 4) /* UDC mem enable */
+#define USBCFG_EBE (1 << 3) /* EHCI busmaster enable */
+#define USBCFG_EME (1 << 2) /* EHCI mem enable */
+#define USBCFG_OBE (1 << 1) /* OHCI busmaster enable */
+#define USBCFG_OME (1 << 0) /* OHCI mem enable */
+#define USBCFG_INIT_AU1200 (USBCFG_PFEN | USBCFG_RDCOMB | USBCFG_UNKNOWN |\
+ USBCFG_SSD | USBCFG_FLA(0x20) | USBCFG_UCAM | \
+ USBCFG_GME | USBCFG_DBE | USBCFG_DME | \
+ USBCFG_EBE | USBCFG_EME | USBCFG_OBE | \
+ USBCFG_OME)
+
+/* Au1300 USB config registers */
+#define USB_DWC_CTRL1 0x00
+#define USB_DWC_CTRL2 0x04
+#define USB_VBUS_TIMER 0x10
+#define USB_SBUS_CTRL 0x14
+#define USB_MSR_ERR 0x18
+#define USB_DWC_CTRL3 0x1C
+#define USB_DWC_CTRL4 0x20
+#define USB_OTG_STATUS 0x28
+#define USB_DWC_CTRL5 0x2C
+#define USB_DWC_CTRL6 0x30
+#define USB_DWC_CTRL7 0x34
+#define USB_PHY_STATUS 0xC0
+#define USB_INT_STATUS 0xC4
+#define USB_INT_ENABLE 0xC8
+
+#define USB_DWC_CTRL1_OTGD 0x04 /* set to DISable OTG */
+#define USB_DWC_CTRL1_HSTRS 0x02 /* set to ENable EHCI */
+#define USB_DWC_CTRL1_DCRS 0x01 /* set to ENable UDC */
+
+#define USB_DWC_CTRL2_PHY1RS 0x04 /* set to enable PHY1 */
+#define USB_DWC_CTRL2_PHY0RS 0x02 /* set to enable PHY0 */
+#define USB_DWC_CTRL2_PHYRS 0x01 /* set to enable PHY */
+
+#define USB_DWC_CTRL3_OHCI1_CKEN (1 << 19)
+#define USB_DWC_CTRL3_OHCI0_CKEN (1 << 18)
+#define USB_DWC_CTRL3_EHCI0_CKEN (1 << 17)
+#define USB_DWC_CTRL3_OTG0_CKEN (1 << 16)
+
+#define USB_SBUS_CTRL_SBCA 0x04 /* coherent access */
+
+#define USB_INTEN_FORCE 0x20
+#define USB_INTEN_PHY 0x10
+#define USB_INTEN_UDC 0x08
+#define USB_INTEN_EHCI 0x04
+#define USB_INTEN_OHCI1 0x02
+#define USB_INTEN_OHCI0 0x01
+
+static DEFINE_SPINLOCK(alchemy_usb_lock);
+
+static inline void __au1300_usb_phyctl(void __iomem *base, int enable)
+{
+ unsigned long r, s;
+
+ r = __raw_readl(base + USB_DWC_CTRL2);
+ s = __raw_readl(base + USB_DWC_CTRL3);
+
+ s &= USB_DWC_CTRL3_OHCI1_CKEN | USB_DWC_CTRL3_OHCI0_CKEN |
+ USB_DWC_CTRL3_EHCI0_CKEN | USB_DWC_CTRL3_OTG0_CKEN;
+
+ if (enable) {
+ /* simply enable all PHYs */
+ r |= USB_DWC_CTRL2_PHY1RS | USB_DWC_CTRL2_PHY0RS |
+ USB_DWC_CTRL2_PHYRS;
+ __raw_writel(r, base + USB_DWC_CTRL2);
+ wmb();
+ } else if (!s) {
+ /* no USB block active, do disable all PHYs */
+ r &= ~(USB_DWC_CTRL2_PHY1RS | USB_DWC_CTRL2_PHY0RS |
+ USB_DWC_CTRL2_PHYRS);
+ __raw_writel(r, base + USB_DWC_CTRL2);
+ wmb();
+ }
+}
+
+static inline void __au1300_ohci_control(void __iomem *base, int enable, int id)
+{
+ unsigned long r;
+
+ if (enable) {
+ __raw_writel(1, base + USB_DWC_CTRL7); /* start OHCI clock */
+ wmb();
+
+ r = __raw_readl(base + USB_DWC_CTRL3); /* enable OHCI block */
+ r |= (id == 0) ? USB_DWC_CTRL3_OHCI0_CKEN
+ : USB_DWC_CTRL3_OHCI1_CKEN;
+ __raw_writel(r, base + USB_DWC_CTRL3);
+ wmb();
+
+ __au1300_usb_phyctl(base, enable); /* power up the PHYs */
+
+ r = __raw_readl(base + USB_INT_ENABLE);
+ r |= (id == 0) ? USB_INTEN_OHCI0 : USB_INTEN_OHCI1;
+ __raw_writel(r, base + USB_INT_ENABLE);
+ wmb();
+
+ /* reset the OHCI start clock bit */
+ __raw_writel(0, base + USB_DWC_CTRL7);
+ wmb();
+ } else {
+ r = __raw_readl(base + USB_INT_ENABLE);
+ r &= ~((id == 0) ? USB_INTEN_OHCI0 : USB_INTEN_OHCI1);
+ __raw_writel(r, base + USB_INT_ENABLE);
+ wmb();
+
+ r = __raw_readl(base + USB_DWC_CTRL3);
+ r &= ~((id == 0) ? USB_DWC_CTRL3_OHCI0_CKEN
+ : USB_DWC_CTRL3_OHCI1_CKEN);
+ __raw_writel(r, base + USB_DWC_CTRL3);
+ wmb();
+
+ __au1300_usb_phyctl(base, enable);
+ }
+}
+
+static inline void __au1300_ehci_control(void __iomem *base, int enable)
+{
+ unsigned long r;
+
+ if (enable) {
+ r = __raw_readl(base + USB_DWC_CTRL3);
+ r |= USB_DWC_CTRL3_EHCI0_CKEN;
+ __raw_writel(r, base + USB_DWC_CTRL3);
+ wmb();
+
+ r = __raw_readl(base + USB_DWC_CTRL1);
+ r |= USB_DWC_CTRL1_HSTRS;
+ __raw_writel(r, base + USB_DWC_CTRL1);
+ wmb();
+
+ __au1300_usb_phyctl(base, enable);
+
+ r = __raw_readl(base + USB_INT_ENABLE);
+ r |= USB_INTEN_EHCI;
+ __raw_writel(r, base + USB_INT_ENABLE);
+ wmb();
+ } else {
+ r = __raw_readl(base + USB_INT_ENABLE);
+ r &= ~USB_INTEN_EHCI;
+ __raw_writel(r, base + USB_INT_ENABLE);
+ wmb();
+
+ r = __raw_readl(base + USB_DWC_CTRL1);
+ r &= ~USB_DWC_CTRL1_HSTRS;
+ __raw_writel(r, base + USB_DWC_CTRL1);
+ wmb();
+
+ r = __raw_readl(base + USB_DWC_CTRL3);
+ r &= ~USB_DWC_CTRL3_EHCI0_CKEN;
+ __raw_writel(r, base + USB_DWC_CTRL3);
+ wmb();
+
+ __au1300_usb_phyctl(base, enable);
+ }
+}
+
+static inline void __au1300_udc_control(void __iomem *base, int enable)
+{
+ unsigned long r;
+
+ if (enable) {
+ r = __raw_readl(base + USB_DWC_CTRL1);
+ r |= USB_DWC_CTRL1_DCRS;
+ __raw_writel(r, base + USB_DWC_CTRL1);
+ wmb();
+
+ __au1300_usb_phyctl(base, enable);
+
+ r = __raw_readl(base + USB_INT_ENABLE);
+ r |= USB_INTEN_UDC;
+ __raw_writel(r, base + USB_INT_ENABLE);
+ wmb();
+ } else {
+ r = __raw_readl(base + USB_INT_ENABLE);
+ r &= ~USB_INTEN_UDC;
+ __raw_writel(r, base + USB_INT_ENABLE);
+ wmb();
+
+ r = __raw_readl(base + USB_DWC_CTRL1);
+ r &= ~USB_DWC_CTRL1_DCRS;
+ __raw_writel(r, base + USB_DWC_CTRL1);
+ wmb();
+
+ __au1300_usb_phyctl(base, enable);
+ }
+}
+
+static inline void __au1300_otg_control(void __iomem *base, int enable)
+{
+ unsigned long r;
+ if (enable) {
+ r = __raw_readl(base + USB_DWC_CTRL3);
+ r |= USB_DWC_CTRL3_OTG0_CKEN;
+ __raw_writel(r, base + USB_DWC_CTRL3);
+ wmb();
+
+ r = __raw_readl(base + USB_DWC_CTRL1);
+ r &= ~USB_DWC_CTRL1_OTGD;
+ __raw_writel(r, base + USB_DWC_CTRL1);
+ wmb();
+
+ __au1300_usb_phyctl(base, enable);
+ } else {
+ r = __raw_readl(base + USB_DWC_CTRL1);
+ r |= USB_DWC_CTRL1_OTGD;
+ __raw_writel(r, base + USB_DWC_CTRL1);
+ wmb();
+
+ r = __raw_readl(base + USB_DWC_CTRL3);
+ r &= ~USB_DWC_CTRL3_OTG0_CKEN;
+ __raw_writel(r, base + USB_DWC_CTRL3);
+ wmb();
+
+ __au1300_usb_phyctl(base, enable);
+ }
+}
+
+static inline int au1300_usb_control(int block, int enable)
+{
+ void __iomem *base =
+ (void __iomem *)KSEG1ADDR(AU1300_USB_CTL_PHYS_ADDR);
+ int ret = 0;
+
+ switch (block) {
+ case ALCHEMY_USB_OHCI0:
+ __au1300_ohci_control(base, enable, 0);
+ break;
+ case ALCHEMY_USB_OHCI1:
+ __au1300_ohci_control(base, enable, 1);
+ break;
+ case ALCHEMY_USB_EHCI0:
+ __au1300_ehci_control(base, enable);
+ break;
+ case ALCHEMY_USB_UDC0:
+ __au1300_udc_control(base, enable);
+ break;
+ case ALCHEMY_USB_OTG0:
+ __au1300_otg_control(base, enable);
+ break;
+ default:
+ ret = -ENODEV;
+ }
+ return ret;
+}
+
+static inline void au1300_usb_init(void)
+{
+ void __iomem *base =
+ (void __iomem *)KSEG1ADDR(AU1300_USB_CTL_PHYS_ADDR);
+
+ /* set some sane defaults. Note: we don't fiddle with DWC_CTRL4
+ * here at all: Port 2 routing (EHCI or UDC) must be set either
+ * by boot firmware or platform init code; I can't autodetect
+ * a sane setting.
+ */
+ __raw_writel(0, base + USB_INT_ENABLE); /* disable all USB irqs */
+ wmb();
+ __raw_writel(0, base + USB_DWC_CTRL3); /* disable all clocks */
+ wmb();
+ __raw_writel(~0, base + USB_MSR_ERR); /* clear all errors */
+ wmb();
+ __raw_writel(~0, base + USB_INT_STATUS); /* clear int status */
+ wmb();
+ /* set coherent access bit */
+ __raw_writel(USB_SBUS_CTRL_SBCA, base + USB_SBUS_CTRL);
+ wmb();
+}
+
+static inline void __au1200_ohci_control(void __iomem *base, int enable)
+{
+ unsigned long r = __raw_readl(base + AU1200_USBCFG);
+ if (enable) {
+ __raw_writel(r | USBCFG_OCE, base + AU1200_USBCFG);
+ wmb();
+ udelay(2000);
+ } else {
+ __raw_writel(r & ~USBCFG_OCE, base + AU1200_USBCFG);
+ wmb();
+ udelay(1000);
+ }
+}
+
+static inline void __au1200_ehci_control(void __iomem *base, int enable)
+{
+ unsigned long r = __raw_readl(base + AU1200_USBCFG);
+ if (enable) {
+ __raw_writel(r | USBCFG_ECE | USBCFG_PPE, base + AU1200_USBCFG);
+ wmb();
+ udelay(1000);
+ } else {
+ if (!(r & USBCFG_UCE)) /* UDC also off? */
+ r &= ~USBCFG_PPE; /* yes: disable HS PHY PLL */
+ __raw_writel(r & ~USBCFG_ECE, base + AU1200_USBCFG);
+ wmb();
+ udelay(1000);
+ }
+}
+
+static inline void __au1200_udc_control(void __iomem *base, int enable)
+{
+ unsigned long r = __raw_readl(base + AU1200_USBCFG);
+ if (enable) {
+ __raw_writel(r | USBCFG_UCE | USBCFG_PPE, base + AU1200_USBCFG);
+ wmb();
+ } else {
+ if (!(r & USBCFG_ECE)) /* EHCI also off? */
+ r &= ~USBCFG_PPE; /* yes: disable HS PHY PLL */
+ __raw_writel(r & ~USBCFG_UCE, base + AU1200_USBCFG);
+ wmb();
+ }
+}
+
+static inline int au1200_usb_control(int block, int enable)
+{
+ void __iomem *base =
+ (void __iomem *)KSEG1ADDR(AU1200_USB_CTL_PHYS_ADDR);
+
+ switch (block) {
+ case ALCHEMY_USB_OHCI0:
+ __au1200_ohci_control(base, enable);
+ break;
+ case ALCHEMY_USB_UDC0:
+ __au1200_udc_control(base, enable);
+ break;
+ case ALCHEMY_USB_EHCI0:
+ __au1200_ehci_control(base, enable);
+ break;
+ default:
+ return -ENODEV;
+ }
+ return 0;
+}
+
+
+/* initialize USB block(s) to a known working state */
+static inline void au1200_usb_init(void)
+{
+ void __iomem *base =
+ (void __iomem *)KSEG1ADDR(AU1200_USB_CTL_PHYS_ADDR);
+ __raw_writel(USBCFG_INIT_AU1200, base + AU1200_USBCFG);
+ wmb();
+ udelay(1000);
+}
+
+static inline int au1000_usb_init(unsigned long rb, int reg)
+{
+ void __iomem *base = (void __iomem *)KSEG1ADDR(rb + reg);
+ unsigned long r = __raw_readl(base);
+ struct clk *c;
+
+ /* 48MHz check. Don't init if no one can provide it */
+ c = clk_get(NULL, "usbh_clk");
+ if (IS_ERR(c))
+ return -ENODEV;
+ if (clk_round_rate(c, 48000000) != 48000000) {
+ clk_put(c);
+ return -ENODEV;
+ }
+ if (clk_set_rate(c, 48000000)) {
+ clk_put(c);
+ return -ENODEV;
+ }
+ clk_put(c);
+
+#if defined(__BIG_ENDIAN)
+ r |= USBHEN_BE;
+#endif
+ r |= USBHEN_C;
+
+ __raw_writel(r, base);
+ wmb();
+ udelay(1000);
+
+ return 0;
+}
+
+
+static inline void __au1xx0_ohci_control(int enable, unsigned long rb, int creg)
+{
+ void __iomem *base = (void __iomem *)KSEG1ADDR(rb);
+ unsigned long r = __raw_readl(base + creg);
+ struct clk *c = clk_get(NULL, "usbh_clk");
+
+ if (IS_ERR(c))
+ return;
+
+ if (enable) {
+ if (clk_prepare_enable(c))
+ goto out;
+
+ __raw_writel(r | USBHEN_CE, base + creg);
+ wmb();
+ udelay(1000);
+ __raw_writel(r | USBHEN_CE | USBHEN_E, base + creg);
+ wmb();
+ udelay(1000);
+
+ /* wait for reset complete (read reg twice: au1500 erratum) */
+ while (__raw_readl(base + creg),
+ !(__raw_readl(base + creg) & USBHEN_RD))
+ udelay(1000);
+ } else {
+ __raw_writel(r & ~(USBHEN_CE | USBHEN_E), base + creg);
+ wmb();
+ clk_disable_unprepare(c);
+ }
+out:
+ clk_put(c);
+}
+
+static inline int au1000_usb_control(int block, int enable, unsigned long rb,
+ int creg)
+{
+ int ret = 0;
+
+ switch (block) {
+ case ALCHEMY_USB_OHCI0:
+ __au1xx0_ohci_control(enable, rb, creg);
+ break;
+ default:
+ ret = -ENODEV;
+ }
+ return ret;
+}
+
+/*
+ * alchemy_usb_control - control Alchemy on-chip USB blocks
+ * @block: USB block to target
+ * @enable: set 1 to enable a block, 0 to disable
+ */
+int alchemy_usb_control(int block, int enable)
+{
+ unsigned long flags;
+ int ret;
+
+ spin_lock_irqsave(&alchemy_usb_lock, flags);
+ switch (alchemy_get_cputype()) {
+ case ALCHEMY_CPU_AU1000:
+ case ALCHEMY_CPU_AU1500:
+ case ALCHEMY_CPU_AU1100:
+ ret = au1000_usb_control(block, enable,
+ AU1000_USB_OHCI_PHYS_ADDR, AU1000_OHCICFG);
+ break;
+ case ALCHEMY_CPU_AU1550:
+ ret = au1000_usb_control(block, enable,
+ AU1550_USB_OHCI_PHYS_ADDR, AU1550_OHCICFG);
+ break;
+ case ALCHEMY_CPU_AU1200:
+ ret = au1200_usb_control(block, enable);
+ break;
+ case ALCHEMY_CPU_AU1300:
+ ret = au1300_usb_control(block, enable);
+ break;
+ default:
+ ret = -ENODEV;
+ }
+ spin_unlock_irqrestore(&alchemy_usb_lock, flags);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(alchemy_usb_control);
+
+
+static unsigned long alchemy_usb_pmdata[2];
+
+static void au1000_usb_pm(unsigned long br, int creg, int susp)
+{
+ void __iomem *base = (void __iomem *)KSEG1ADDR(br);
+
+ if (susp) {
+ alchemy_usb_pmdata[0] = __raw_readl(base + creg);
+ /* There appears to be some undocumented reset register.... */
+ __raw_writel(0, base + 0x04);
+ wmb();
+ __raw_writel(0, base + creg);
+ wmb();
+ } else {
+ __raw_writel(alchemy_usb_pmdata[0], base + creg);
+ wmb();
+ }
+}
+
+static void au1200_usb_pm(int susp)
+{
+ void __iomem *base =
+ (void __iomem *)KSEG1ADDR(AU1200_USB_OTG_PHYS_ADDR);
+ if (susp) {
+ /* save OTG_CAP/MUX registers which indicate port routing */
+ /* FIXME: write an OTG driver to do that */
+ alchemy_usb_pmdata[0] = __raw_readl(base + 0x00);
+ alchemy_usb_pmdata[1] = __raw_readl(base + 0x04);
+ } else {
+ /* restore access to all MMIO areas */
+ au1200_usb_init();
+
+ /* restore OTG_CAP/MUX registers */
+ __raw_writel(alchemy_usb_pmdata[0], base + 0x00);
+ __raw_writel(alchemy_usb_pmdata[1], base + 0x04);
+ wmb();
+ }
+}
+
+static void au1300_usb_pm(int susp)
+{
+ void __iomem *base =
+ (void __iomem *)KSEG1ADDR(AU1300_USB_CTL_PHYS_ADDR);
+ /* remember Port2 routing */
+ if (susp) {
+ alchemy_usb_pmdata[0] = __raw_readl(base + USB_DWC_CTRL4);
+ } else {
+ au1300_usb_init();
+ __raw_writel(alchemy_usb_pmdata[0], base + USB_DWC_CTRL4);
+ wmb();
+ }
+}
+
+static void alchemy_usb_pm(int susp)
+{
+ switch (alchemy_get_cputype()) {
+ case ALCHEMY_CPU_AU1000:
+ case ALCHEMY_CPU_AU1500:
+ case ALCHEMY_CPU_AU1100:
+ au1000_usb_pm(AU1000_USB_OHCI_PHYS_ADDR, AU1000_OHCICFG, susp);
+ break;
+ case ALCHEMY_CPU_AU1550:
+ au1000_usb_pm(AU1550_USB_OHCI_PHYS_ADDR, AU1550_OHCICFG, susp);
+ break;
+ case ALCHEMY_CPU_AU1200:
+ au1200_usb_pm(susp);
+ break;
+ case ALCHEMY_CPU_AU1300:
+ au1300_usb_pm(susp);
+ break;
+ }
+}
+
+static int alchemy_usb_suspend(void)
+{
+ alchemy_usb_pm(1);
+ return 0;
+}
+
+static void alchemy_usb_resume(void)
+{
+ alchemy_usb_pm(0);
+}
+
+static struct syscore_ops alchemy_usb_pm_ops = {
+ .suspend = alchemy_usb_suspend,
+ .resume = alchemy_usb_resume,
+};
+
+static int __init alchemy_usb_init(void)
+{
+ int ret = 0;
+
+ switch (alchemy_get_cputype()) {
+ case ALCHEMY_CPU_AU1000:
+ case ALCHEMY_CPU_AU1500:
+ case ALCHEMY_CPU_AU1100:
+ ret = au1000_usb_init(AU1000_USB_OHCI_PHYS_ADDR,
+ AU1000_OHCICFG);
+ break;
+ case ALCHEMY_CPU_AU1550:
+ ret = au1000_usb_init(AU1550_USB_OHCI_PHYS_ADDR,
+ AU1550_OHCICFG);
+ break;
+ case ALCHEMY_CPU_AU1200:
+ au1200_usb_init();
+ break;
+ case ALCHEMY_CPU_AU1300:
+ au1300_usb_init();
+ break;
+ }
+
+ if (!ret)
+ register_syscore_ops(&alchemy_usb_pm_ops);
+
+ return ret;
+}
+arch_initcall(alchemy_usb_init);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-17 15:47:20 +0000