Merge tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc

Pull ARM SoC driver specific changes from Arnd Bergmann:
 "These changes are all driver specific and cross over between arm-soc
  contents and some other subsystem, in these cases cpufreq, crypto,
  dma, pinctrl, mailbox and usb, and the subsystem owners agreed to have
  these changes merged through arm-soc.

  As we proceed to untangle the dependencies between platform code and
  driver code, the amount of changes in this category is fortunately
  shrinking, for 3.11 we have 16 branches here and 101 non-merge
  changesets, the majority of which are for the stedma40 dma engine
  driver used in the ux500 platform.  Cleaning up that code touches
  multiple subsystems, but gets rid of the dependency in the end.

  The mailbox code moved out from mach-omap2 to drivers/mailbox is an
  intermediate step and is still omap specific at the moment.  Patches
  exist to generalize the subsystem and add other drivers with the same
  API, but those did not make it for 3.11."

* tag 'drivers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (101 commits)
  crypto: ux500: use dmaengine_submit API
  crypto: ux500: use dmaengine_prep_slave_sg API
  crypto: ux500: use dmaengine_device_control API
  crypto: ux500/crypt: add missing __iomem qualifiers
  crypto: ux500/hash: add missing static qualifiers
  crypto: ux500/hash: use readl on iomem addresses
  dmaengine: ste_dma40: Declare memcpy config as static
  ARM: ux500: Remove mop500_snowball_ethernet_clock_enable()
  ARM: ux500: Correct the EN_3v3 regulator's on/off GPIO
  ARM: ux500: Provide a AB8500 GPIO Device Tree node
  gpio: rcar: fix gpio_rcar_of_table
  gpio-rcar: Remove #ifdef CONFIG_OF around OF-specific sections
  gpio-rcar: Reference core gpio documentation in the DT bindings
  clk: exynos5250: Add enum entries for divider clock of i2s1 and i2s2
  ARM: dts: Update Samsung I2S documentation
  ARM: dts: add clock provider information for i2s controllers in Exynos5250
  ARM: dts: add Exynos audio subsystem clock controller node
  clk: samsung: register audio subsystem clocks using common clock framework
  ARM: dts: use #include for all device trees for Samsung
  pinctrl: s3c24xx: use correct header for chained_irq functions
  ...

1 files changed, 312 insertions, 0 deletions

diff --git a/drivers/cpufreq/s3c2440-cpufreq.c b/drivers/cpufreq/s3c2440-cpufreq.c
new file mode 100644
index 000000000000..72b2cc8a5a85
--- /dev/null
+++ b/drivers/cpufreq/s3c2440-cpufreq.c
@@ -0,0 +1,312 @@
+/*
+ * Copyright (c) 2006-2009 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ *	Vincent Sanders <vince@simtec.co.uk>
+ *
+ * S3C2440/S3C2442 CPU Frequency scaling
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/cpufreq.h>
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include <mach/regs-clock.h>
+
+#include <plat/cpu.h>
+#include <plat/cpu-freq-core.h>
+#include <plat/clock.h>
+
+static struct clk *xtal;
+static struct clk *fclk;
+static struct clk *hclk;
+static struct clk *armclk;
+
+/* HDIV: 1, 2, 3, 4, 6, 8 */
+
+static inline int within_khz(unsigned long a, unsigned long b)
+{
+	long diff = a - b;
+
+	return (diff >= -1000 && diff <= 1000);
+}
+
+/**
+ * s3c2440_cpufreq_calcdivs - calculate divider settings
+ * @cfg: The cpu frequency settings.
+ *
+ * Calcualte the divider values for the given frequency settings
+ * specified in @cfg. The values are stored in @cfg for later use
+ * by the relevant set routine if the request settings can be reached.
+ */
+int s3c2440_cpufreq_calcdivs(struct s3c_cpufreq_config *cfg)
+{
+	unsigned int hdiv, pdiv;
+	unsigned long hclk, fclk, armclk;
+	unsigned long hclk_max;
+
+	fclk = cfg->freq.fclk;
+	armclk = cfg->freq.armclk;
+	hclk_max = cfg->max.hclk;
+
+	s3c_freq_dbg("%s: fclk is %lu, armclk %lu, max hclk %lu\n",
+		     __func__, fclk, armclk, hclk_max);
+
+	if (armclk > fclk) {
+		printk(KERN_WARNING "%s: armclk > fclk\n", __func__);
+		armclk = fclk;
+	}
+
+	/* if we are in DVS, we need HCLK to be <= ARMCLK */
+	if (armclk < fclk && armclk < hclk_max)
+		hclk_max = armclk;
+
+	for (hdiv = 1; hdiv < 9; hdiv++) {
+		if (hdiv == 5 || hdiv == 7)
+			hdiv++;
+
+		hclk = (fclk / hdiv);
+		if (hclk <= hclk_max || within_khz(hclk, hclk_max))
+			break;
+	}
+
+	s3c_freq_dbg("%s: hclk %lu, div %d\n", __func__, hclk, hdiv);
+
+	if (hdiv > 8)
+		goto invalid;
+
+	pdiv = (hclk > cfg->max.pclk) ? 2 : 1;
+
+	if ((hclk / pdiv) > cfg->max.pclk)
+		pdiv++;
+
+	s3c_freq_dbg("%s: pdiv %d\n", __func__, pdiv);
+
+	if (pdiv > 2)
+		goto invalid;
+
+	pdiv *= hdiv;
+
+	/* calculate a valid armclk */
+
+	if (armclk < hclk)
+		armclk = hclk;
+
+	/* if we're running armclk lower than fclk, this really means
+	 * that the system should go into dvs mode, which means that
+	 * armclk is connected to hclk. */
+	if (armclk < fclk) {
+		cfg->divs.dvs = 1;
+		armclk = hclk;
+	} else
+		cfg->divs.dvs = 0;
+
+	cfg->freq.armclk = armclk;
+
+	/* store the result, and then return */
+
+	cfg->divs.h_divisor = hdiv;
+	cfg->divs.p_divisor = pdiv;
+
+	return 0;
+
+ invalid:
+	return -EINVAL;
+}
+
+#define CAMDIVN_HCLK_HALF (S3C2440_CAMDIVN_HCLK3_HALF | \
+			   S3C2440_CAMDIVN_HCLK4_HALF)
+
+/**
+ * s3c2440_cpufreq_setdivs - set the cpu frequency divider settings
+ * @cfg: The cpu frequency settings.
+ *
+ * Set the divisors from the settings in @cfg, which where generated
+ * during the calculation phase by s3c2440_cpufreq_calcdivs().
+ */
+static void s3c2440_cpufreq_setdivs(struct s3c_cpufreq_config *cfg)
+{
+	unsigned long clkdiv, camdiv;
+
+	s3c_freq_dbg("%s: divsiors: h=%d, p=%d\n", __func__,
+		     cfg->divs.h_divisor, cfg->divs.p_divisor);
+
+	clkdiv = __raw_readl(S3C2410_CLKDIVN);
+	camdiv = __raw_readl(S3C2440_CAMDIVN);
+
+	clkdiv &= ~(S3C2440_CLKDIVN_HDIVN_MASK | S3C2440_CLKDIVN_PDIVN);
+	camdiv &= ~CAMDIVN_HCLK_HALF;
+
+	switch (cfg->divs.h_divisor) {
+	case 1:
+		clkdiv |= S3C2440_CLKDIVN_HDIVN_1;
+		break;
+
+	case 2:
+		clkdiv |= S3C2440_CLKDIVN_HDIVN_2;
+		break;
+
+	case 6:
+		camdiv |= S3C2440_CAMDIVN_HCLK3_HALF;
+	case 3:
+		clkdiv |= S3C2440_CLKDIVN_HDIVN_3_6;
+		break;
+
+	case 8:
+		camdiv |= S3C2440_CAMDIVN_HCLK4_HALF;
+	case 4:
+		clkdiv |= S3C2440_CLKDIVN_HDIVN_4_8;
+		break;
+
+	default:
+		BUG();	/* we don't expect to get here. */
+	}
+
+	if (cfg->divs.p_divisor != cfg->divs.h_divisor)
+		clkdiv |= S3C2440_CLKDIVN_PDIVN;
+
+	/* todo - set pclk. */
+
+	/* Write the divisors first with hclk intentionally halved so that
+	 * when we write clkdiv we will under-frequency instead of over. We
+	 * then make a short delay and remove the hclk halving if necessary.
+	 */
+
+	__raw_writel(camdiv | CAMDIVN_HCLK_HALF, S3C2440_CAMDIVN);
+	__raw_writel(clkdiv, S3C2410_CLKDIVN);
+
+	ndelay(20);
+	__raw_writel(camdiv, S3C2440_CAMDIVN);
+
+	clk_set_parent(armclk, cfg->divs.dvs ? hclk : fclk);
+}
+
+static int run_freq_for(unsigned long max_hclk, unsigned long fclk,
+			int *divs,
+			struct cpufreq_frequency_table *table,
+			size_t table_size)
+{
+	unsigned long freq;
+	int index = 0;
+	int div;
+
+	for (div = *divs; div > 0; div = *divs++) {
+		freq = fclk / div;
+
+		if (freq > max_hclk && div != 1)
+			continue;
+
+		freq /= 1000; /* table is in kHz */
+		index = s3c_cpufreq_addfreq(table, index, table_size, freq);
+		if (index < 0)
+			break;
+	}
+
+	return index;
+}
+
+static int hclk_divs[] = { 1, 2, 3, 4, 6, 8, -1 };
+
+static int s3c2440_cpufreq_calctable(struct s3c_cpufreq_config *cfg,
+				     struct cpufreq_frequency_table *table,
+				     size_t table_size)
+{
+	int ret;
+
+	WARN_ON(cfg->info == NULL);
+	WARN_ON(cfg->board == NULL);
+
+	ret = run_freq_for(cfg->info->max.hclk,
+			   cfg->info->max.fclk,
+			   hclk_divs,
+			   table, table_size);
+
+	s3c_freq_dbg("%s: returning %d\n", __func__, ret);
+
+	return ret;
+}
+
+struct s3c_cpufreq_info s3c2440_cpufreq_info = {
+	.max		= {
+		.fclk	= 400000000,
+		.hclk	= 133333333,
+		.pclk	=  66666666,
+	},
+
+	.locktime_m	= 300,
+	.locktime_u	= 300,
+	.locktime_bits	= 16,
+
+	.name		= "s3c244x",
+	.calc_iotiming	= s3c2410_iotiming_calc,
+	.set_iotiming	= s3c2410_iotiming_set,
+	.get_iotiming	= s3c2410_iotiming_get,
+	.set_fvco	= s3c2410_set_fvco,
+
+	.set_refresh	= s3c2410_cpufreq_setrefresh,
+	.set_divs	= s3c2440_cpufreq_setdivs,
+	.calc_divs	= s3c2440_cpufreq_calcdivs,
+	.calc_freqtable	= s3c2440_cpufreq_calctable,
+
+	.resume_clocks	= s3c244x_setup_clocks,
+
+	.debug_io_show  = s3c_cpufreq_debugfs_call(s3c2410_iotiming_debugfs),
+};
+
+static int s3c2440_cpufreq_add(struct device *dev,
+			       struct subsys_interface *sif)
+{
+	xtal = s3c_cpufreq_clk_get(NULL, "xtal");
+	hclk = s3c_cpufreq_clk_get(NULL, "hclk");
+	fclk = s3c_cpufreq_clk_get(NULL, "fclk");
+	armclk = s3c_cpufreq_clk_get(NULL, "armclk");
+
+	if (IS_ERR(xtal) || IS_ERR(hclk) || IS_ERR(fclk) || IS_ERR(armclk)) {
+		printk(KERN_ERR "%s: failed to get clocks\n", __func__);
+		return -ENOENT;
+	}
+
+	return s3c_cpufreq_register(&s3c2440_cpufreq_info);
+}
+
+static struct subsys_interface s3c2440_cpufreq_interface = {
+	.name		= "s3c2440_cpufreq",
+	.subsys		= &s3c2440_subsys,
+	.add_dev	= s3c2440_cpufreq_add,
+};
+
+static int s3c2440_cpufreq_init(void)
+{
+	return subsys_interface_register(&s3c2440_cpufreq_interface);
+}
+
+/* arch_initcall adds the clocks we need, so use subsys_initcall. */
+subsys_initcall(s3c2440_cpufreq_init);
+
+static struct subsys_interface s3c2442_cpufreq_interface = {
+	.name		= "s3c2442_cpufreq",
+	.subsys		= &s3c2442_subsys,
+	.add_dev	= s3c2440_cpufreq_add,
+};
+
+static int s3c2442_cpufreq_init(void)
+{
+	return subsys_interface_register(&s3c2442_cpufreq_interface);
+}
+subsys_initcall(s3c2442_cpufreq_init);