drivers/i2c/ck505: Add generic driver to configure clockgen

Replaces the ics/954309 driver with a more generic version to
accommodate clockgens with a different amount of registers.

It also features a mask to only touch certain bits of the clockgen.

TODO: set appropriate mask for X60/T60 since the datasheets for their
clockgens can be found.

Change-Id: Ie43c4de7891a39f2f443e78213ecd688134e68d7
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/20042
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/drivers/i2c/ck505/Kconfig

@@ -0,0 +1,2 @@
+config DRIVERS_I2C_CK505
+	bool

src/drivers/i2c/ck505/Makefile.inc

@@ -0,0 +1 @@
+ramstage-$(CONFIG_DRIVERS_I2C_CK505) += ck505.c

src/drivers/i2c/ck505/chip.h

@@ -0,0 +1,26 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Sven Schnelle <svens@stackframe.org>
+ *
+ * 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.
+ */
+
+#ifndef DRIVERS_CK505_CHIP_H
+#define DRIVERS_CK505_CHIP_H
+
+struct drivers_i2c_ck505_config {
+	const int nregs;
+	const u8 regs[32];
+	const u8 mask[32];
+};
+
+#endif

src/drivers/i2c/ck505/ck505.c

@@ -0,0 +1,81 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2011 Sven Schnelle <svens@stackframe.org>
+ *
+ * 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.
+ */
+
+#include <assert.h>
+#include <console/console.h>
+#include <device/device.h>
+#include <device/smbus.h>
+#include <device/pci.h>
+#include <device/pci_ids.h>
+#include <device/pci_ops.h>
+#include <cpu/x86/msr.h>
+#include "chip.h"
+#include <string.h>
+
+#define SMBUS_BLOCK_SIZE 32
+
+static void ck505_init(struct device *dev)
+{
+	struct drivers_i2c_ck505_config *config;
+	int dev_nregs, nregs;
+	u8 block[SMBUS_BLOCK_SIZE];
+	int i;
+
+	if (!dev->enabled || dev->path.type != DEVICE_PATH_I2C)
+		return;
+
+	config = dev->chip_info;
+
+	dev_nregs = smbus_block_read(dev, 0, sizeof(block), block);
+
+	if (dev_nregs < 0) {
+		printk(BIOS_ERR, "Failed reading ck505 configuration!\n");
+		return;
+	}
+
+	/* This means that the devicetree doesn't have to specify nregs */
+	nregs = MIN(MIN(dev_nregs, config->nregs == 0 ? SMBUS_BLOCK_SIZE
+				: config->nregs), ARRAY_SIZE(config->mask));
+
+
+	printk(BIOS_DEBUG, "Changing %d of the %d ck505 config bytes.\n",
+		nregs, dev_nregs);
+
+	assert(ARRAY_SIZE(config->mask) == ARRAY_SIZE(config->regs));
+
+	for (i = 0; i < nregs && i < SMBUS_BLOCK_SIZE; i++)
+		block[i] = (block[i] & ~config->mask[i]) | config->regs[i];
+
+	if (smbus_block_write(dev, 0, dev_nregs, block) < 0)
+		printk(BIOS_ERR, "Failed writing ck505 configuration!\n");
+}
+
+static struct device_operations ck505_operations = {
+	.read_resources		= DEVICE_NOOP,
+	.set_resources		= DEVICE_NOOP,
+	.enable_resources	= DEVICE_NOOP,
+	.init			= ck505_init,
+};
+
+static void enable_dev(struct device *dev)
+{
+	dev->ops = &ck505_operations;
+}
+
+struct chip_operations drivers_i2c_ck505_ops = {
+	CHIP_NAME("CK505 Clock generator")
+	.enable_dev = enable_dev,
+};