[U-Boot] [PATCH] inka4x0: board specific RTC support.

[ap at denx.de]

From: Andreas Pfefferle <ap at denx.de>

This patch adds the board specific communication routines needed
by the external 4543 RTC.

Signed-off-by: Andreas Pfefferle <ap at denx.de>
---
 board/inka4x0/inka4x0.c |  124 +++++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 124 insertions(+), 0 deletions(-)

diff --git a/board/inka4x0/inka4x0.c b/board/inka4x0/inka4x0.c
index 507196b..6312b4f 100644
--- a/board/inka4x0/inka4x0.c
+++ b/board/inka4x0/inka4x0.c
@@ -8,6 +8,9 @@
  * (C) Copyright 2004
  * Martin Krause, TQ-Systems GmbH, martin.krause at tqs.de
  *
+ * (C) Copyright 2008
+ * Andreas Pfefferle, DENX Software Engineering, ap at denx.de.
+ *
  * See file CREDITS for list of people who contributed to this
  * project.
  *
@@ -27,6 +30,7 @@
  * MA 02111-1307 USA
  */
 
+#include <asm/io.h>
 #include <common.h>
 #include <mpc5xxx.h>
 #include <pci.h>
@@ -45,6 +49,111 @@
 #error "INKA4x0 SDRAM: invalid chip type specified!"
 #endif
 
+#if defined(CONFIG_RTC_RTC4543) && defined(CONFIG_CMD_DATE)
+
+#define RTC_CE    0x01000000
+#define RTC_WR    0x02000000
+#define RTC_DATA  0x01
+#define RTC_CLK   0x02
+
+#define RTCWRITE(n, data) do {\
+  for (i = 0; i < n; i++) {\
+	gpio->sint_dvo &= ~RTC_DATA;\
+	if (data & (1 << i))\
+		gpio->sint_dvo |= RTC_DATA;\
+	udelay(10);\
+	gpio->sint_dvo |= RTC_CLK;\
+	udelay(10);\
+	gpio->sint_dvo &= ~RTC_CLK;\
+	udelay(10);\
+  } \
+} while (0)
+
+#define RTCREAD(n, data)  do {\
+  for (i = 0; i < n; i++) {\
+	gpio->sint_dvo |= RTC_CLK;\
+	udelay(10);\
+	data |= ((gpio->sint_ival & RTC_DATA) << i);\
+	gpio->sint_dvo &= ~RTC_CLK;\
+	udelay(10);\
+  } \
+} while (0)
+
+uchar rtc_read(uchar reg)
+{
+	struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio *)MPC5XXX_GPIO;
+	int i;
+	uchar val = 0;
+	switch (reg) {
+	case 0:
+		/* PSC3_4 is input */
+		gpio->sint_ddr &= ~RTC_DATA;
+		/* Lower WR */
+		out_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O,
+			in_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O) & ~RTC_WR);
+		udelay(1);
+		/* Rise CE */
+		out_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O,
+			in_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O) | RTC_CE);
+		udelay(1);
+		break;
+	case 1:
+	case 2:
+	case 3:
+	case 5:
+	case 6:
+	case 7:
+		RTCREAD(8, val);
+		break;
+	case 4:
+		RTCREAD(4, val);
+		break;
+	case 8:
+		/* Lower CE */
+		out_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O,
+			in_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O) & ~RTC_CE);
+		break;
+	}
+	return val;
+}
+
+void rtc_write(uchar reg, uchar val)
+{
+	struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio *)MPC5XXX_GPIO;
+	int i;
+	switch (reg) {
+	case 0:
+		/* PSC3_4 is output */
+		gpio->sint_ddr |= RTC_DATA;
+		/* Rise WR */
+		out_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O,
+			in_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O) | RTC_WR);
+		udelay(1);
+		/* Rise CE */
+		out_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O,
+			in_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O) | RTC_CE);
+		udelay(1);
+		break;
+	case 1:
+	case 2:
+	case 3:
+	case 5:
+	case 6:
+	case 7:
+		RTCWRITE(8, val);
+		break;
+	case 4:
+		RTCWRITE(4, val);
+		break;
+	case 8:
+		/* Lower CE */
+		out_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O,
+			in_be32((unsigned *)MPC5XXX_WU_GPIO_DATA_O) & ~RTC_CE);
+		break;
+	}
+}
+#endif
+
 #ifndef CONFIG_SYS_RAMBOOT
 static void sdram_start (int hi_addr)
 {
@@ -220,6 +329,21 @@ int misc_init_f (void)
 	*(vu_long *) MPC5XXX_WU_GPIO_ENABLE |= GPIO_PSC3_9;
 	*(vu_long *) MPC5XXX_WU_GPIO_DIR    |= GPIO_PSC3_9;
 	*(vu_long *) MPC5XXX_WU_GPIO_DATA_O   |= GPIO_PSC3_9;
+
+	/* Configure RTC and Display */
+	struct mpc5xxx_gpio *gpio = (struct mpc5xxx_gpio *)MPC5XXX_GPIO;
+	out_be32((unsigned *)MPC5XXX_WU_GPIO_ENABLE,
+		  in_be32((unsigned *)MPC5XXX_WU_GPIO_ENABLE) | 0x03000000);
+	out_be32((unsigned *)MPC5XXX_WU_GPIO_DIR,
+		  in_be32((unsigned *)MPC5XXX_WU_GPIO_DIR) | 0x03000000);
+	gpio->sint_gpioe |= 0x07;
+	gpio->sint_ddr |= 0x06;
+	gpio->sint_inten &= ~0x03;
+	*(u_long *)MPC5XXX_WU_GPIO_DATA_O &= ~0x01000000;
+	gpio->sint_dvo &= ~0x02;
+	gpio->sint_dvo |= 0x04;
+	/* end of RTC and Display configuration */
+
 	return 0;
 }
 
-- 
1.6.0.4