[U-Boot] [PATCH 4/7] Tegra2: add additional pin multiplexing features
Simon Glass
sjg at chromium.org
Fri Apr 29 02:52:48 CEST 2011
This adds an enum for each pin and some functions for changing the pin
muxing setup.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
arch/arm/cpu/armv7/tegra2/Makefile | 2 +-
arch/arm/cpu/armv7/tegra2/pinmux.c | 54 ++++++++++
arch/arm/include/asm/arch-tegra2/pinmux.h | 156 +++++++++++++++++++++++++++--
board/nvidia/common/board.c | 10 +--
4 files changed, 207 insertions(+), 15 deletions(-)
create mode 100644 arch/arm/cpu/armv7/tegra2/pinmux.c
diff --git a/arch/arm/cpu/armv7/tegra2/Makefile b/arch/arm/cpu/armv7/tegra2/Makefile
index b35764c..f673f03 100644
--- a/arch/arm/cpu/armv7/tegra2/Makefile
+++ b/arch/arm/cpu/armv7/tegra2/Makefile
@@ -28,7 +28,7 @@ include $(TOPDIR)/config.mk
LIB = $(obj)lib$(SOC).o
SOBJS := lowlevel_init.o
-COBJS := ap20.o board.o clock.o sys_info.o timer.o
+COBJS := ap20.o board.o clock.o pinmux.o sys_info.o timer.o
SRCS := $(SOBJS:.o=.S) $(COBJS:.o=.c)
OBJS := $(addprefix $(obj),$(COBJS) $(SOBJS))
diff --git a/arch/arm/cpu/armv7/tegra2/pinmux.c b/arch/arm/cpu/armv7/tegra2/pinmux.c
new file mode 100644
index 0000000..f00fd7c
--- /dev/null
+++ b/arch/arm/cpu/armv7/tegra2/pinmux.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2011 The Chromium OS Authors.
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/* Tegra2 pin multiplexing functions */
+
+#include <asm/io.h>
+#include <asm/arch/bitfield.h>
+#include <asm/arch/tegra2.h>
+#include <asm/arch/pinmux.h>
+#include <common.h>
+
+
+void pinmux_set_tristate(enum pmux_pin pin, int enable)
+{
+ struct pmux_tri_ctlr *pmt = (struct pmux_tri_ctlr *)NV_PA_APB_MISC_BASE;
+ u32 *tri = &pmt->pmt_tri[TRISTATE_REG(pin)];
+ u32 reg;
+
+ reg = readl(tri);
+ if (enable)
+ reg |= TRISTATE_MASK(pin);
+ else
+ reg &= ~TRISTATE_MASK(pin);
+ writel(reg, tri);
+}
+
+void pinmux_tristate_enable(enum pmux_pin pin)
+{
+ pinmux_set_tristate(pin, 1);
+}
+
+void pinmux_tristate_disable(enum pmux_pin pin)
+{
+ pinmux_set_tristate(pin, 0);
+}
+
diff --git a/arch/arm/include/asm/arch-tegra2/pinmux.h b/arch/arm/include/asm/arch-tegra2/pinmux.h
index 8b4bd8d..d4a0812 100644
--- a/arch/arm/include/asm/arch-tegra2/pinmux.h
+++ b/arch/arm/include/asm/arch-tegra2/pinmux.h
@@ -24,6 +24,143 @@
#ifndef _PINMUX_H_
#define _PINMUX_H_
+
+/* Pins which we can set to tristate or normal */
+enum pmux_pin {
+ /* APB_MISC_PP_TRISTATE_REG_A_0 */
+ PIN_ATA,
+ PIN_ATB,
+ PIN_ATC,
+ PIN_ATD,
+ PIN_CDEV1,
+ PIN_CDEV2,
+ PIN_CSUS,
+ PIN_DAP1,
+
+ PIN_DAP2,
+ PIN_DAP3,
+ PIN_DAP4,
+ PIN_DTA,
+ PIN_DTB,
+ PIN_DTC,
+ PIN_DTD,
+ PIN_DTE,
+
+ PIN_GPU,
+ PIN_GPV,
+ PIN_I2CP,
+ PIN_IRTX,
+ PIN_IRRX,
+ PIN_KBCB,
+ PIN_KBCA,
+ PIN_PMC,
+
+ PIN_PTA,
+ PIN_RM,
+ PIN_KBCE,
+ PIN_KBCF,
+ PIN_GMA,
+ PIN_GMC,
+ PIN_SDMMC1,
+ PIN_OWC,
+
+ /* 32: APB_MISC_PP_TRISTATE_REG_B_0 */
+ PIN_GME,
+ PIN_SDC,
+ PIN_SDD,
+ PIN_RESERVED0,
+ PIN_SLXA,
+ PIN_SLXC,
+ PIN_SLXD,
+ PIN_SLXK,
+
+ PIN_SPDI,
+ PIN_SPDO,
+ PIN_SPIA,
+ PIN_SPIB,
+ PIN_SPIC,
+ PIN_SPID,
+ PIN_SPIE,
+ PIN_SPIF,
+
+ PIN_SPIG,
+ PIN_SPIH,
+ PIN_UAA,
+ PIN_UAB,
+ PIN_UAC,
+ PIN_UAD,
+ PIN_UCA,
+ PIN_UCB,
+
+ PIN_RESERVED1,
+ PIN_ATE,
+ PIN_KBCC,
+ PIN_RESERVED2,
+ PIN_RESERVED3,
+ PIN_GMB,
+ PIN_GMD,
+ PIN_DDC,
+
+ /* 64: APB_MISC_PP_TRISTATE_REG_C_0 */
+ PIN_LD0,
+ PIN_LD1,
+ PIN_LD2,
+ PIN_LD3,
+ PIN_LD4,
+ PIN_LD5,
+ PIN_LD6,
+ PIN_LD7,
+
+ PIN_LD8,
+ PIN_LD9,
+ PIN_LD10,
+ PIN_LD11,
+ PIN_LD12,
+ PIN_LD13,
+ PIN_LD14,
+ PIN_LD15,
+
+ PIN_LD16,
+ PIN_LD17,
+ PIN_LHP0,
+ PIN_LHP1,
+ PIN_LHP2,
+ PIN_LVP0,
+ PIN_LVP1,
+ PIN_HDINT,
+
+ PIN_LM0,
+ PIN_LM1,
+ PIN_LVS,
+ PIN_LSC0,
+ PIN_LSC1,
+ PIN_LSCK,
+ PIN_LDC,
+ PIN_LCSN,
+
+ /* 96: APB_MISC_PP_TRISTATE_REG_D_0 */
+ PIN_LSPI,
+ PIN_LSDA,
+ PIN_LSDI,
+ PIN_LPW0,
+ PIN_LPW1,
+ PIN_LPW2,
+ PIN_LDI,
+ PIN_LHS,
+
+ PIN_LPP,
+ PIN_RESERVED4,
+ PIN_KBCD,
+ PIN_GPU7,
+ PIN_DTF,
+ PIN_UDA,
+ PIN_CRTP,
+ PIN_SDB,
+};
+
+
+#define TEGRA_TRISTATE_REGS 4
+
/* APB MISC Pin Mux and Tristate (APB_MISC_PP_) registers */
struct pmux_tri_ctlr {
uint pmt_reserved0; /* ABP_MISC_PP_ reserved offset 00 */
@@ -31,10 +168,7 @@ struct pmux_tri_ctlr {
uint pmt_strap_opt_a; /* _STRAPPING_OPT_A_0, offset 08 */
uint pmt_reserved2; /* ABP_MISC_PP_ reserved offset 0C */
uint pmt_reserved3; /* ABP_MISC_PP_ reserved offset 10 */
- uint pmt_tri_a; /* _TRI_STATE_REG_A_0, offset 14 */
- uint pmt_tri_b; /* _TRI_STATE_REG_B_0, offset 18 */
- uint pmt_tri_c; /* _TRI_STATE_REG_C_0, offset 1C */
- uint pmt_tri_d; /* _TRI_STATE_REG_D_0, offset 20 */
+ uint pmt_tri[TEGRA_TRISTATE_REGS]; /* _TRI_STATE_REG_A/B/C/D_0 14-20 */
uint pmt_cfg_ctl; /* _CONFIG_CTL_0, offset 24 */
uint pmt_reserved[22]; /* ABP_MISC_PP_ reserved offs 28-7C */
@@ -48,8 +182,16 @@ struct pmux_tri_ctlr {
uint pmt_ctl_g; /* _PIN_MUX_CTL_G_0, offset 98 */
};
-#define Z_GMC (1 << 29)
-#define Z_IRRX (1 << 20)
-#define Z_IRTX (1 << 19)
+/* Converts a pin number to a tristate register: 0=A, 1=B, 2=C, 3=D */
+#define TRISTATE_REG(id) ((id) >> 5)
+
+/* Mask value for a tristate (within TRISTATE_REG(id)) */
+#define TRISTATE_MASK(id) (1 << ((id) & 0x1f))
+
+/* Set a pin to tristate */
+void pinmux_tristate_enable(enum pmux_pin pin);
+
+/* Set a pin to normal (non tristate) */
+void pinmux_tristate_disable(enum pmux_pin pin);
#endif /* PINMUX_H */
diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c
index 12e79ae..f07328e 100644
--- a/board/nvidia/common/board.c
+++ b/board/nvidia/common/board.c
@@ -140,19 +140,15 @@ static void pin_mux_uart(void)
reg &= 0xFFF0FFFF; /* IRRX_/IRTX_SEL [19:16] = 00 UARTA */
writel(reg, &pmt->pmt_ctl_c);
- reg = readl(&pmt->pmt_tri_a);
- reg &= ~Z_IRRX; /* Z_IRRX = normal (0) */
- reg &= ~Z_IRTX; /* Z_IRTX = normal (0) */
- writel(reg, &pmt->pmt_tri_a);
+ pinmux_tristate_disable(PIN_IRRX);
+ pinmux_tristate_disable(PIN_IRTX);
#endif /* CONFIG_TEGRA2_ENABLE_UARTA */
#if defined(CONFIG_TEGRA2_ENABLE_UARTD)
reg = readl(&pmt->pmt_ctl_b);
reg &= 0xFFFFFFF3; /* GMC_SEL [3:2] = 00, UARTD */
writel(reg, &pmt->pmt_ctl_b);
- reg = readl(&pmt->pmt_tri_a);
- reg &= ~Z_GMC; /* Z_GMC = normal (0) */
- writel(reg, &pmt->pmt_tri_a);
+ pinmux_tristate_disable(PIN_GMC);
#endif /* CONFIG_TEGRA2_ENABLE_UARTD */
}
--
1.7.3.1
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