This adds an enum for each pin and some functions for changing the pin muxing setup.
Changes for v2: - Removed use of bitfield access macros
Signed-off-by: Simon Glass sjg@chromium.org --- arch/arm/cpu/armv7/tegra2/Makefile | 2 +- arch/arm/cpu/armv7/tegra2/pinmux.c | 53 ++++++++++ arch/arm/include/asm/arch-tegra2/pinmux.h | 155 +++++++++++++++++++++++++++-- board/nvidia/common/board.c | 10 +-- 4 files changed, 205 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..4d35172 --- /dev/null +++ b/arch/arm/cpu/armv7/tegra2/pinmux.c @@ -0,0 +1,53 @@ +/* + * 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/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..b8a4753 100644 --- a/arch/arm/include/asm/arch-tegra2/pinmux.h +++ b/arch/arm/include/asm/arch-tegra2/pinmux.h @@ -24,6 +24,142 @@ #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 +167,7 @@ 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 +181,16 @@ 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 fa8243f..480b11b 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 */ }