powerpc/QE: add support for QE USB clocks routing

This patch adds a function to the qe_lib to setup QE USB clocks routing.
To setup clocks safely, cmxgcr register needs locking, so I just reused
ucc_lock since it was used only to protect cmxgcr.

The idea behind placing clocks routing functions into the qe_lib is that
later we'll hopefully switch to the generic Linux Clock API, thus, for
example, FHCI driver may be used for QE and CPM chips without nasty #ifdefs.

This patch also fixes QE_USB_RESTART_TX command definition in the qe.h.

Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Acked-By: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/sysdev/qe_lib/Kconfig

@@ -20,3 +20,7 @@ config UCC
 	bool
 	default y if UCC_FAST || UCC_SLOW
 
+config QE_USB
+	bool
+	help
+	  QE USB Host Controller support

arch/powerpc/sysdev/qe_lib/Makefile

@@ -6,3 +6,4 @@ obj-$(CONFIG_QUICC_ENGINE)+= qe.o qe_ic.o qe_io.o
 obj-$(CONFIG_UCC)	+= ucc.o
 obj-$(CONFIG_UCC_SLOW)	+= ucc_slow.o
 obj-$(CONFIG_UCC_FAST)	+= ucc_fast.o
+obj-$(CONFIG_QE_USB)	+= usb.o

arch/powerpc/sysdev/qe_lib/ucc.c

@@ -26,7 +26,8 @@
 #include <asm/qe.h>
 #include <asm/ucc.h>
 
-static DEFINE_SPINLOCK(ucc_lock);
+DEFINE_SPINLOCK(cmxgcr_lock);
+EXPORT_SYMBOL(cmxgcr_lock);
 
 int ucc_set_qe_mux_mii_mng(unsigned int ucc_num)
 {
@@ -35,10 +36,10 @@ int ucc_set_qe_mux_mii_mng(unsigned int ucc_num)
 	if (ucc_num > UCC_MAX_NUM - 1)
 		return -EINVAL;
 
-	spin_lock_irqsave(&ucc_lock, flags);
+	spin_lock_irqsave(&cmxgcr_lock, flags);
 	clrsetbits_be32(&qe_immr->qmx.cmxgcr, QE_CMXGCR_MII_ENET_MNG,
 		ucc_num << QE_CMXGCR_MII_ENET_MNG_SHIFT);
-	spin_unlock_irqrestore(&ucc_lock, flags);
+	spin_unlock_irqrestore(&cmxgcr_lock, flags);
 
 	return 0;
 }

arch/powerpc/sysdev/qe_lib/usb.c

@@ -0,0 +1,55 @@
+/*
+ * QE USB routines
+ *
+ * Copyright (c) Freescale Semicondutor, Inc. 2006.
+ *               Shlomi Gridish <gridish@freescale.com>
+ *               Jerry Huang <Chang-Ming.Huang@freescale.com>
+ * Copyright (c) MontaVista Software, Inc. 2008.
+ *               Anton Vorontsov <avorontsov@ru.mvista.com>
+ *
+ * This program is free software; you can redistribute  it and/or modify it
+ * under  the terms of  the GNU General  Public License as published by the
+ * Free Software Foundation;  either version 2 of the  License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/io.h>
+#include <asm/immap_qe.h>
+#include <asm/qe.h>
+
+int qe_usb_clock_set(enum qe_clock clk, int rate)
+{
+	struct qe_mux __iomem *mux = &qe_immr->qmx;
+	unsigned long flags;
+	u32 val;
+
+	switch (clk) {
+	case QE_CLK3:  val = QE_CMXGCR_USBCS_CLK3;  break;
+	case QE_CLK5:  val = QE_CMXGCR_USBCS_CLK5;  break;
+	case QE_CLK7:  val = QE_CMXGCR_USBCS_CLK7;  break;
+	case QE_CLK9:  val = QE_CMXGCR_USBCS_CLK9;  break;
+	case QE_CLK13: val = QE_CMXGCR_USBCS_CLK13; break;
+	case QE_CLK17: val = QE_CMXGCR_USBCS_CLK17; break;
+	case QE_CLK19: val = QE_CMXGCR_USBCS_CLK19; break;
+	case QE_CLK21: val = QE_CMXGCR_USBCS_CLK21; break;
+	case QE_BRG9:  val = QE_CMXGCR_USBCS_BRG9;  break;
+	case QE_BRG10: val = QE_CMXGCR_USBCS_BRG10; break;
+	default:
+		pr_err("%s: requested unknown clock %d\n", __func__, clk);
+		return -EINVAL;
+	}
+
+	if (qe_clock_is_brg(clk))
+		qe_setbrg(clk, rate, 1);
+
+	spin_lock_irqsave(&cmxgcr_lock, flags);
+
+	clrsetbits_be32(&mux->cmxgcr, QE_CMXGCR_USBCS, val);
+
+	spin_unlock_irqrestore(&cmxgcr_lock, flags);
+
+	return 0;
+}
+EXPORT_SYMBOL(qe_usb_clock_set);

include/asm-powerpc/qe.h

@@ -16,6 +16,7 @@
 #define _ASM_POWERPC_QE_H
 #ifdef __KERNEL__
 
+#include <linux/spinlock.h>
 #include <asm/immap_qe.h>
 
 #define QE_NUM_OF_SNUM	28
@@ -74,6 +75,13 @@ enum qe_clock {
 	QE_CLK_DUMMY
 };
 
+static inline bool qe_clock_is_brg(enum qe_clock clk)
+{
+	return clk >= QE_BRG1 && clk <= QE_BRG16;
+}
+
+extern spinlock_t cmxgcr_lock;
+
 /* Export QE common operations */
 extern void qe_reset(void);
 extern int par_io_init(struct device_node *np);
@@ -156,6 +164,9 @@ int qe_upload_firmware(const struct qe_firmware *firmware);
 /* Obtain information on the uploaded firmware */
 struct qe_firmware_info *qe_get_firmware_info(void);
 
+/* QE USB */
+int qe_usb_clock_set(enum qe_clock clk, int rate);
+
 /* Buffer descriptors */
 struct qe_bd {
 	__be16 status;
@@ -254,6 +265,16 @@ enum comm_dir {
 #define QE_CMXGCR_MII_ENET_MNG		0x00007000
 #define QE_CMXGCR_MII_ENET_MNG_SHIFT	12
 #define QE_CMXGCR_USBCS			0x0000000f
+#define QE_CMXGCR_USBCS_CLK3		0x1
+#define QE_CMXGCR_USBCS_CLK5		0x2
+#define QE_CMXGCR_USBCS_CLK7		0x3
+#define QE_CMXGCR_USBCS_CLK9		0x4
+#define QE_CMXGCR_USBCS_CLK13		0x5
+#define QE_CMXGCR_USBCS_CLK17		0x6
+#define QE_CMXGCR_USBCS_CLK19		0x7
+#define QE_CMXGCR_USBCS_CLK21		0x8
+#define QE_CMXGCR_USBCS_BRG9		0x9
+#define QE_CMXGCR_USBCS_BRG10		0xa
 
 /* QE CECR Commands.
 */
@@ -283,7 +304,7 @@ enum comm_dir {
 #define QE_HPAC_START_TX		0x0000060b
 #define QE_HPAC_START_RX		0x0000070b
 #define QE_USB_STOP_TX			0x0000000a
-#define QE_USB_RESTART_TX		0x0000000b
+#define QE_USB_RESTART_TX		0x0000000c
 #define QE_QMC_STOP_TX			0x0000000c
 #define QE_QMC_STOP_RX			0x0000000d
 #define QE_SS7_SU_FIL_RESET		0x0000000e