veyron_pinky: Move PMIC driver into SoC directory

The Rk808 PMIC is a part that will probably be used by most Rk3288
boards, so it makes sense to keep it as common code in the the SoC
directory. This patch puts LDO control functions into rk3288/rk808.c, so
that the mainboard only has to call a simple interface to set up the
specific LDOs it requires.

BUG=chrome-os-partner:30167
TEST=Booted both this and the old version with a stubbed-out
i2c_writeb(), ensured that the final values are the same.

Change-Id: I7efa60f8a357ce6be7490e64d2e0e3f72ad16f1c
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 4df22cd78ee04fefc6f7fa0e5c3d903eb1794422
Original-Change-Id: Ic172f9c402e829995f049726d3cb6dbd637039d1
Original-Signed-off-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-on: https://chromium-review.googlesource.com/217598
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8871
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

3 files changed, 92 insertions, 0 deletions

diff --git a/src/soc/rockchip/rk3288/Makefile.inc b/src/soc/rockchip/rk3288/Makefile.inc
index 8453757983..f9aa3775b8 100644
--- a/src/soc/rockchip/rk3288/Makefile.inc
+++ b/src/soc/rockchip/rk3288/Makefile.inc
@@ -50,6 +50,7 @@ ramstage-y += clock.c
 ramstage-y += spi.c
 ramstage-y += gpio.c
 ramstage-y += media.c
+ramstage-y += rk808.c
 ramstage-$(CONFIG_DRIVERS_UART) += uart.c
 
 $(objcbfs)/bootblock.raw.elf: $(objcbfs)/bootblock.elf
diff --git a/src/soc/rockchip/rk3288/rk808.c b/src/soc/rockchip/rk3288/rk808.c
new file mode 100644
index 0000000000..0d629ca041
--- /dev/null
+++ b/src/soc/rockchip/rk3288/rk808.c
@@ -0,0 +1,66 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Rockchip Inc.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <assert.h>
+#include <console/console.h>
+#include <device/i2c.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include "rk808.h"
+
+#define RK808_ADDR	0x1b
+
+#define LDO_EN		0x24
+#define LDO_ONSEL(i)	(0x39 + 2 * i)
+#define LDO_SLPSEL(i)	(0x3a + 2 * i)
+
+static void rk808_clrsetbits(uint8_t bus, uint8_t reg, uint8_t clr, uint8_t set)
+{
+	uint8_t value;
+
+	if (i2c_readb(bus, RK808_ADDR, reg, &value) ||
+	    i2c_writeb(bus, RK808_ADDR, reg, (value & ~clr) | set))
+		printk(BIOS_ERR, "ERROR: Cannot set Rk808[%#x]!\n", reg);
+}
+
+void rk808_configure_ldo(uint8_t bus, int ldo, int millivolts)
+{
+	uint8_t vsel;
+
+	switch (ldo) {
+	case 1:
+	case 2:
+	case 4:
+	case 5:
+	case 8:
+		vsel = millivolts / 100 - 18;
+		break;
+	case 3:
+	case 6:
+	case 7:
+		vsel = millivolts / 100 - 8;
+		break;
+	default:
+		die("Unknown LDO index!");
+	}
+	assert(vsel <= 0x10);
+
+	rk808_clrsetbits(bus, LDO_ONSEL(ldo), 0x1f, vsel);
+	rk808_clrsetbits(bus, LDO_EN, 0, 1 << (ldo - 1));
+}
diff --git a/src/soc/rockchip/rk3288/rk808.h b/src/soc/rockchip/rk3288/rk808.h
new file mode 100644
index 0000000000..a6ba67c538
--- /dev/null
+++ b/src/soc/rockchip/rk3288/rk808.h
@@ -0,0 +1,25 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Rockchip Inc.
+ *
+ * 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; version 2 of the License.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __SOC_ROCKCHIP_RK3288_PMIC_H__
+#define __SOC_ROCKCHIP_RK3288_PMIC_H__
+
+void rk808_configure_ldo(uint8_t bus, int ldo, int millivolts);
+
+#endif