[U-Boot] [PATCH 1/3] mx31: Introduce mx31_set_gpr function

Fabio Estevam
2011-10-21T02:01:29Z

Introduce mx31_set_gpr function for setting the GPR (General Purpose Register) on MX31.

This function can be useful for setting a group of pins into tied to some specific peripherals.

Reuse this function from the linux kernel.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
---
arch/arm/cpu/arm1136/mx31/generic.c | 15 +++++++++++
arch/arm/include/asm/arch-mx31/clock.h | 1 +
arch/arm/include/asm/arch-mx31/imx-regs.h | 38 +++++++++++++++++++++++++++++
3 files changed, 54 insertions(+), 0 deletions(-)

diff --git a/arch/arm/cpu/arm1136/mx31/generic.c b/arch/arm/cpu/arm1136/mx31/generic.c
index 78df7b9..4f27e25 100644
--- a/arch/arm/cpu/arm1136/mx31/generic.c
+++ b/arch/arm/cpu/arm1136/mx31/generic.c
@@ -27,6 +27,8 @@
#include <asm/io.h>
#include <asm/arch/sys_proto.h>

+#define IOMUXGPR (IOMUXC_BASE + 0x008)
+
static u32 mx31_decode_pll(u32 reg, u32 infreq)
{
u32 mfi = GET_PLL_MFI(reg);
@@ -141,6 +143,19 @@ void mx31_set_pad(enum iomux_pins pin, u32 config)

}

+void mx31_set_gpr(enum iomux_gp_func gp, char en)
+{
+ u32 l;
+
+ l = readl(IOMUXGPR);
+ if (en)
+ l |= gp;
+ else
+ l &= ~gp;
+
+ writel(l, IOMUXGPR);
+}
+
void mxc_setup_weimcs(int cs, const struct mxc_weimcs *weimcs)
{
struct mx31_weim *weim = (struct mx31_weim *) WEIM_BASE;
diff --git a/arch/arm/include/asm/arch-mx31/clock.h b/arch/arm/include/asm/arch-mx31/clock.h
index 2e3bce2..3e22d9a 100644
--- a/arch/arm/include/asm/arch-mx31/clock.h
+++ b/arch/arm/include/asm/arch-mx31/clock.h
@@ -37,6 +37,7 @@ unsigned int mxc_get_clock(enum mxc_clock clk);
extern u32 imx_get_uartclk(void);
extern void mx31_gpio_mux(unsigned long mode);
extern void mx31_set_pad(enum iomux_pins pin, u32 config);
+extern void mx31_set_gpr(enum iomux_gp_func gp, char en);

void mx31_uart1_hw_init(void);
void mx31_spi2_hw_init(void);
diff --git a/arch/arm/include/asm/arch-mx31/imx-regs.h b/arch/arm/include/asm/arch-mx31/imx-regs.h
index 552c821..6ce008d 100644
--- a/arch/arm/include/asm/arch-mx31/imx-regs.h
+++ b/arch/arm/include/asm/arch-mx31/imx-regs.h
@@ -468,6 +468,44 @@ enum iomux_pins {
MX31_PIN_CAPTURE = IOMUX_PIN(7, 327),
};

+/*
+ * various IOMUX general purpose functions
+ */
+enum iomux_gp_func {
+ MUX_PGP_FIRI = 1 << 0,
+ MUX_DDR_MODE = 1 << 1,
+ MUX_PGP_CSPI_BB = 1 << 2,
+ MUX_PGP_ATA_1 = 1 << 3,
+ MUX_PGP_ATA_2 = 1 << 4,
+ MUX_PGP_ATA_3 = 1 << 5,
+ MUX_PGP_ATA_4 = 1 << 6,
+ MUX_PGP_ATA_5 = 1 << 7,
+ MUX_PGP_ATA_6 = 1 << 8,
+ MUX_PGP_ATA_7 = 1 << 9,
+ MUX_PGP_ATA_8 = 1 << 10,
+ MUX_PGP_UH2 = 1 << 11,
+ MUX_SDCTL_CSD0_SEL = 1 << 12,
+ MUX_SDCTL_CSD1_SEL = 1 << 13,
+ MUX_CSPI1_UART3 = 1 << 14,
+ MUX_EXTDMAREQ2_MBX_SEL = 1 << 15,
+ MUX_TAMPER_DETECT_EN = 1 << 16,
+ MUX_PGP_USB_4WIRE = 1 << 17,
+ MUX_PGP_USB_COMMON = 1 << 18,
+ MUX_SDHC_MEMSTICK1 = 1 << 19,
+ MUX_SDHC_MEMSTICK2 = 1 << 20,
+ MUX_PGP_SPLL_BYP = 1 << 21,
+ MUX_PGP_UPLL_BYP = 1 << 22,
+ MUX_PGP_MSHC1_CLK_SEL = 1 << 23,
+ MUX_PGP_MSHC2_CLK_SEL = 1 << 24,
+ MUX_CSPI3_UART5_SEL = 1 << 25,
+ MUX_PGP_ATA_9 = 1 << 26,
+ MUX_PGP_USB_SUSPEND = 1 << 27,
+ MUX_PGP_USB_OTG_LOOPBACK = 1 << 28,
+ MUX_PGP_USB_HS1_LOOPBACK = 1 << 29,
+ MUX_PGP_USB_HS2_LOOPBACK = 1 << 30,
+ MUX_CLKO_DDR_MODE = 1 << 31,
+};
+
/* Bit definitions for RCSR register in CCM */
#define CCM_RCSR_NF16B (1 << 31)
#define CCM_RCSR_NFMS (1 << 30)
--
1.7.1