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path: root/drivers/soc/fsl/qe/ucc.c
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Diffstat (limited to 'drivers/soc/fsl/qe/ucc.c')
-rw-r--r--drivers/soc/fsl/qe/ucc.c212
1 files changed, 212 insertions, 0 deletions
diff --git a/drivers/soc/fsl/qe/ucc.c b/drivers/soc/fsl/qe/ucc.c
new file mode 100644
index 000000000..b59d3358f
--- /dev/null
+++ b/drivers/soc/fsl/qe/ucc.c
@@ -0,0 +1,212 @@
+/*
+ * arch/powerpc/sysdev/qe_lib/ucc.c
+ *
+ * QE UCC API Set - UCC specific routines implementations.
+ *
+ * Copyright (C) 2006 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * Authors: Shlomi Gridish <gridish@freescale.com>
+ * Li Yang <leoli@freescale.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/stddef.h>
+#include <linux/spinlock.h>
+#include <linux/export.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <soc/fsl/qe/immap_qe.h>
+#include <soc/fsl/qe/qe.h>
+#include <soc/fsl/qe/ucc.h>
+
+int ucc_set_qe_mux_mii_mng(unsigned int ucc_num)
+{
+ unsigned long flags;
+
+ if (ucc_num > UCC_MAX_NUM - 1)
+ return -EINVAL;
+
+ 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(&cmxgcr_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(ucc_set_qe_mux_mii_mng);
+
+/* Configure the UCC to either Slow or Fast.
+ *
+ * A given UCC can be figured to support either "slow" devices (e.g. UART)
+ * or "fast" devices (e.g. Ethernet).
+ *
+ * 'ucc_num' is the UCC number, from 0 - 7.
+ *
+ * This function also sets the UCC_GUEMR_SET_RESERVED3 bit because that bit
+ * must always be set to 1.
+ */
+int ucc_set_type(unsigned int ucc_num, enum ucc_speed_type speed)
+{
+ u8 __iomem *guemr;
+
+ /* The GUEMR register is at the same location for both slow and fast
+ devices, so we just use uccX.slow.guemr. */
+ switch (ucc_num) {
+ case 0: guemr = &qe_immr->ucc1.slow.guemr;
+ break;
+ case 1: guemr = &qe_immr->ucc2.slow.guemr;
+ break;
+ case 2: guemr = &qe_immr->ucc3.slow.guemr;
+ break;
+ case 3: guemr = &qe_immr->ucc4.slow.guemr;
+ break;
+ case 4: guemr = &qe_immr->ucc5.slow.guemr;
+ break;
+ case 5: guemr = &qe_immr->ucc6.slow.guemr;
+ break;
+ case 6: guemr = &qe_immr->ucc7.slow.guemr;
+ break;
+ case 7: guemr = &qe_immr->ucc8.slow.guemr;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ clrsetbits_8(guemr, UCC_GUEMR_MODE_MASK,
+ UCC_GUEMR_SET_RESERVED3 | speed);
+
+ return 0;
+}
+
+static void get_cmxucr_reg(unsigned int ucc_num, __be32 __iomem **cmxucr,
+ unsigned int *reg_num, unsigned int *shift)
+{
+ unsigned int cmx = ((ucc_num & 1) << 1) + (ucc_num > 3);
+
+ *reg_num = cmx + 1;
+ *cmxucr = &qe_immr->qmx.cmxucr[cmx];
+ *shift = 16 - 8 * (ucc_num & 2);
+}
+
+int ucc_mux_set_grant_tsa_bkpt(unsigned int ucc_num, int set, u32 mask)
+{
+ __be32 __iomem *cmxucr;
+ unsigned int reg_num;
+ unsigned int shift;
+
+ /* check if the UCC number is in range. */
+ if (ucc_num > UCC_MAX_NUM - 1)
+ return -EINVAL;
+
+ get_cmxucr_reg(ucc_num, &cmxucr, &reg_num, &shift);
+
+ if (set)
+ setbits32(cmxucr, mask << shift);
+ else
+ clrbits32(cmxucr, mask << shift);
+
+ return 0;
+}
+
+int ucc_set_qe_mux_rxtx(unsigned int ucc_num, enum qe_clock clock,
+ enum comm_dir mode)
+{
+ __be32 __iomem *cmxucr;
+ unsigned int reg_num;
+ unsigned int shift;
+ u32 clock_bits = 0;
+
+ /* check if the UCC number is in range. */
+ if (ucc_num > UCC_MAX_NUM - 1)
+ return -EINVAL;
+
+ /* The communications direction must be RX or TX */
+ if (!((mode == COMM_DIR_RX) || (mode == COMM_DIR_TX)))
+ return -EINVAL;
+
+ get_cmxucr_reg(ucc_num, &cmxucr, &reg_num, &shift);
+
+ switch (reg_num) {
+ case 1:
+ switch (clock) {
+ case QE_BRG1: clock_bits = 1; break;
+ case QE_BRG2: clock_bits = 2; break;
+ case QE_BRG7: clock_bits = 3; break;
+ case QE_BRG8: clock_bits = 4; break;
+ case QE_CLK9: clock_bits = 5; break;
+ case QE_CLK10: clock_bits = 6; break;
+ case QE_CLK11: clock_bits = 7; break;
+ case QE_CLK12: clock_bits = 8; break;
+ case QE_CLK15: clock_bits = 9; break;
+ case QE_CLK16: clock_bits = 10; break;
+ default: break;
+ }
+ break;
+ case 2:
+ switch (clock) {
+ case QE_BRG5: clock_bits = 1; break;
+ case QE_BRG6: clock_bits = 2; break;
+ case QE_BRG7: clock_bits = 3; break;
+ case QE_BRG8: clock_bits = 4; break;
+ case QE_CLK13: clock_bits = 5; break;
+ case QE_CLK14: clock_bits = 6; break;
+ case QE_CLK19: clock_bits = 7; break;
+ case QE_CLK20: clock_bits = 8; break;
+ case QE_CLK15: clock_bits = 9; break;
+ case QE_CLK16: clock_bits = 10; break;
+ default: break;
+ }
+ break;
+ case 3:
+ switch (clock) {
+ case QE_BRG9: clock_bits = 1; break;
+ case QE_BRG10: clock_bits = 2; break;
+ case QE_BRG15: clock_bits = 3; break;
+ case QE_BRG16: clock_bits = 4; break;
+ case QE_CLK3: clock_bits = 5; break;
+ case QE_CLK4: clock_bits = 6; break;
+ case QE_CLK17: clock_bits = 7; break;
+ case QE_CLK18: clock_bits = 8; break;
+ case QE_CLK7: clock_bits = 9; break;
+ case QE_CLK8: clock_bits = 10; break;
+ case QE_CLK16: clock_bits = 11; break;
+ default: break;
+ }
+ break;
+ case 4:
+ switch (clock) {
+ case QE_BRG13: clock_bits = 1; break;
+ case QE_BRG14: clock_bits = 2; break;
+ case QE_BRG15: clock_bits = 3; break;
+ case QE_BRG16: clock_bits = 4; break;
+ case QE_CLK5: clock_bits = 5; break;
+ case QE_CLK6: clock_bits = 6; break;
+ case QE_CLK21: clock_bits = 7; break;
+ case QE_CLK22: clock_bits = 8; break;
+ case QE_CLK7: clock_bits = 9; break;
+ case QE_CLK8: clock_bits = 10; break;
+ case QE_CLK16: clock_bits = 11; break;
+ default: break;
+ }
+ break;
+ default: break;
+ }
+
+ /* Check for invalid combination of clock and UCC number */
+ if (!clock_bits)
+ return -ENOENT;
+
+ if (mode == COMM_DIR_RX)
+ shift += 4;
+
+ clrsetbits_be32(cmxucr, QE_CMXUCR_TX_CLK_SRC_MASK << shift,
+ clock_bits << shift);
+
+ return 0;
+}