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

Pull ARM SoC cleanups from Arnd Bergmann:
 "A large number of cleanups, all over the platforms.  This is dominated
  largely by the Samsung platforms (s3c, s5p, exynos) and a few of the
  others moving code out of arch/arm into more appropriate subsystems.

  The clocksource and irqchip drivers are now abstracted to the point
  where platforms that are already cleaned up do not need to even
  specify the driver they use, it can all get configured from the device
  tree as we do for normal device drivers.  The clocksource changes
  basically touch every single platform in the process.

  We further clean up the use of platform specific header files here,
  with the goal of turning more of the platforms over to being
  "multiplatform" enabled, which implies that they cannot expose their
  headers to architecture independent code any more.

  It is expected that no functional changes are part of the cleanup.
  The overall reduction in total code lines is mostly the result of
  removing broken and obsolete code."

* tag 'cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (133 commits)
  ARM: mvebu: correct gated clock documentation
  ARM: kirkwood: add missing include for nsa310
  ARM: exynos: move exynos4210-combiner to drivers/irqchip
  mfd: db8500-prcmu: update resource passing
  drivers/db8500-cpufreq: delete dangling include
  ARM: at91: remove NEOCORE 926 board
  sunxi: Cleanup the reset code and add meaningful registers defines
  ARM: S3C24XX: header mach/regs-mem.h local
  ARM: S3C24XX: header mach/regs-power.h local
  ARM: S3C24XX: header mach/regs-s3c2412-mem.h local
  ARM: S3C24XX: Remove plat-s3c24xx directory in arch/arm/
  ARM: S3C24XX: transform s3c2443 subirqs into new structure
  ARM: S3C24XX: modify s3c2443 irq init to initialize all irqs
  ARM: S3C24XX: move s3c2443 irq code to irq.c
  ARM: S3C24XX: transform s3c2416 irqs into new structure
  ARM: S3C24XX: modify s3c2416 irq init to initialize all irqs
  ARM: S3C24XX: move s3c2416 irq init to common irq code
  ARM: S3C24XX: Modify s3c_irq_wake to use the hwirq property
  ARM: S3C24XX: Move irq syscore-ops to irq-pm
  clocksource: always define CLOCKSOURCE_OF_DECLARE
  ...

1 files changed, 478 insertions, 0 deletions

diff --git a/arch/arm/mach-s3c24xx/iotiming-s3c2410.c b/arch/arm/mach-s3c24xx/iotiming-s3c2410.c
new file mode 100644
index 00000000000..4cd13ab6496
--- /dev/null
+++ b/arch/arm/mach-s3c24xx/iotiming-s3c2410.c
@@ -0,0 +1,478 @@
+/*
+ * Copyright (c) 2006-2009 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C24XX CPU Frequency scaling - IO timing for S3C2410/S3C2440/S3C2442
+ *
+ * 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/kernel.h>
+#include <linux/errno.h>
+#include <linux/cpufreq.h>
+#include <linux/seq_file.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+
+#include <mach/map.h>
+#include <mach/regs-clock.h>
+
+#include <plat/cpu-freq-core.h>
+
+#include "regs-mem.h"
+
+#define print_ns(x) ((x) / 10), ((x) % 10)
+
+/**
+ * s3c2410_print_timing - print bank timing data for debug purposes
+ * @pfx: The prefix to put on the output
+ * @timings: The timing inforamtion to print.
+*/
+static void s3c2410_print_timing(const char *pfx,
+				 struct s3c_iotimings *timings)
+{
+	struct s3c2410_iobank_timing *bt;
+	int bank;
+
+	for (bank = 0; bank < MAX_BANKS; bank++) {
+		bt = timings->bank[bank].io_2410;
+		if (!bt)
+			continue;
+
+		printk(KERN_DEBUG "%s %d: Tacs=%d.%d, Tcos=%d.%d, Tacc=%d.%d, "
+		       "Tcoh=%d.%d, Tcah=%d.%d\n", pfx, bank,
+		       print_ns(bt->tacs),
+		       print_ns(bt->tcos),
+		       print_ns(bt->tacc),
+		       print_ns(bt->tcoh),
+		       print_ns(bt->tcah));
+	}
+}
+
+/**
+ * bank_reg - convert bank number to pointer to the control register.
+ * @bank: The IO bank number.
+ */
+static inline void __iomem *bank_reg(unsigned int bank)
+{
+	return S3C2410_BANKCON0 + (bank << 2);
+}
+
+/**
+ * bank_is_io - test whether bank is used for IO
+ * @bankcon: The bank control register.
+ *
+ * This is a simplistic test to see if any BANKCON[x] is not an IO
+ * bank. It currently does not take into account whether BWSCON has
+ * an illegal width-setting in it, or if the pin connected to nCS[x]
+ * is actually being handled as a chip-select.
+ */
+static inline int bank_is_io(unsigned long bankcon)
+{
+	return !(bankcon & S3C2410_BANKCON_SDRAM);
+}
+
+/**
+ * to_div - convert cycle time to divisor
+ * @cyc: The cycle time, in 10ths of nanoseconds.
+ * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
+ *
+ * Convert the given cycle time into the divisor to use to obtain it from
+ * HCLK.
+*/
+static inline unsigned int to_div(unsigned int cyc, unsigned int hclk_tns)
+{
+	if (cyc == 0)
+		return 0;
+
+	return DIV_ROUND_UP(cyc, hclk_tns);
+}
+
+/**
+ * calc_0124 - calculate divisor control for divisors that do /0, /1. /2 and /4
+ * @cyc: The cycle time, in 10ths of nanoseconds.
+ * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
+ * @v: Pointer to register to alter.
+ * @shift: The shift to get to the control bits.
+ *
+ * Calculate the divisor, and turn it into the correct control bits to
+ * set in the result, @v.
+ */
+static unsigned int calc_0124(unsigned int cyc, unsigned long hclk_tns,
+			      unsigned long *v, int shift)
+{
+	unsigned int div = to_div(cyc, hclk_tns);
+	unsigned long val;
+
+	s3c_freq_iodbg("%s: cyc=%d, hclk=%lu, shift=%d => div %d\n",
+		       __func__, cyc, hclk_tns, shift, div);
+
+	switch (div) {
+	case 0:
+		val = 0;
+		break;
+	case 1:
+		val = 1;
+		break;
+	case 2:
+		val = 2;
+		break;
+	case 3:
+	case 4:
+		val = 3;
+		break;
+	default:
+		return -1;
+	}
+
+	*v |= val << shift;
+	return 0;
+}
+
+int calc_tacp(unsigned int cyc, unsigned long hclk, unsigned long *v)
+{
+	/* Currently no support for Tacp calculations. */
+	return 0;
+}
+
+/**
+ * calc_tacc - calculate divisor control for tacc.
+ * @cyc: The cycle time, in 10ths of nanoseconds.
+ * @nwait_en: IS nWAIT enabled for this bank.
+ * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
+ * @v: Pointer to register to alter.
+ *
+ * Calculate the divisor control for tACC, taking into account whether
+ * the bank has nWAIT enabled. The result is used to modify the value
+ * pointed to by @v.
+*/
+static int calc_tacc(unsigned int cyc, int nwait_en,
+		     unsigned long hclk_tns, unsigned long *v)
+{
+	unsigned int div = to_div(cyc, hclk_tns);
+	unsigned long val;
+
+	s3c_freq_iodbg("%s: cyc=%u, nwait=%d, hclk=%lu => div=%u\n",
+		       __func__, cyc, nwait_en, hclk_tns, div);
+
+	/* if nWait enabled on an bank, Tacc must be at-least 4 cycles. */
+	if (nwait_en && div < 4)
+		div = 4;
+
+	switch (div) {
+	case 0:
+		val = 0;
+		break;
+
+	case 1:
+	case 2:
+	case 3:
+	case 4:
+		val = div - 1;
+		break;
+
+	case 5:
+	case 6:
+		val = 4;
+		break;
+
+	case 7:
+	case 8:
+		val = 5;
+		break;
+
+	case 9:
+	case 10:
+		val = 6;
+		break;
+
+	case 11:
+	case 12:
+	case 13:
+	case 14:
+		val = 7;
+		break;
+
+	default:
+		return -1;
+	}
+
+	*v |= val << 8;
+	return 0;
+}
+
+/**
+ * s3c2410_calc_bank - calculate bank timing infromation
+ * @cfg: The configuration we need to calculate for.
+ * @bt: The bank timing information.
+ *
+ * Given the cycle timine for a bank @bt, calculate the new BANKCON
+ * setting for the @cfg timing. This updates the timing information
+ * ready for the cpu frequency change.
+ */
+static int s3c2410_calc_bank(struct s3c_cpufreq_config *cfg,
+			     struct s3c2410_iobank_timing *bt)
+{
+	unsigned long hclk = cfg->freq.hclk_tns;
+	unsigned long res;
+	int ret;
+
+	res  = bt->bankcon;
+	res &= (S3C2410_BANKCON_SDRAM | S3C2410_BANKCON_PMC16);
+
+	/* tacp: 2,3,4,5 */
+	/* tcah: 0,1,2,4 */
+	/* tcoh: 0,1,2,4 */
+	/* tacc: 1,2,3,4,6,7,10,14 (>4 for nwait) */
+	/* tcos: 0,1,2,4 */
+	/* tacs: 0,1,2,4 */
+
+	ret  = calc_0124(bt->tacs, hclk, &res, S3C2410_BANKCON_Tacs_SHIFT);
+	ret |= calc_0124(bt->tcos, hclk, &res, S3C2410_BANKCON_Tcos_SHIFT);
+	ret |= calc_0124(bt->tcah, hclk, &res, S3C2410_BANKCON_Tcah_SHIFT);
+	ret |= calc_0124(bt->tcoh, hclk, &res, S3C2410_BANKCON_Tcoh_SHIFT);
+
+	if (ret)
+		return -EINVAL;
+
+	ret |= calc_tacp(bt->tacp, hclk, &res);
+	ret |= calc_tacc(bt->tacc, bt->nwait_en, hclk, &res);
+
+	if (ret)
+		return -EINVAL;
+
+	bt->bankcon = res;
+	return 0;
+}
+
+static unsigned int tacc_tab[] = {
+	[0]	= 1,
+	[1]	= 2,
+	[2]	= 3,
+	[3]	= 4,
+	[4]	= 6,
+	[5]	= 9,
+	[6]	= 10,
+	[7]	= 14,
+};
+
+/**
+ * get_tacc - turn tACC value into cycle time
+ * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
+ * @val: The bank timing register value, shifed down.
+ */
+static unsigned int get_tacc(unsigned long hclk_tns,
+			     unsigned long val)
+{
+	val &= 7;
+	return hclk_tns * tacc_tab[val];
+}
+
+/**
+ * get_0124 - turn 0/1/2/4 divider into cycle time
+ * @hclk_tns: The cycle time for HCLK, in 10ths of nanoseconds.
+ * @val: The bank timing register value, shifed down.
+ */
+static unsigned int get_0124(unsigned long hclk_tns,
+			     unsigned long val)
+{
+	val &= 3;
+	return hclk_tns * ((val == 3) ? 4 : val);
+}
+
+/**
+ * s3c2410_iotiming_getbank - turn BANKCON into cycle time information
+ * @cfg: The frequency configuration
+ * @bt: The bank timing to fill in (uses cached BANKCON)
+ *
+ * Given the BANKCON setting in @bt and the current frequency settings
+ * in @cfg, update the cycle timing information.
+ */
+void s3c2410_iotiming_getbank(struct s3c_cpufreq_config *cfg,
+			      struct s3c2410_iobank_timing *bt)
+{
+	unsigned long bankcon = bt->bankcon;
+	unsigned long hclk = cfg->freq.hclk_tns;
+
+	bt->tcah = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcah_SHIFT);
+	bt->tcoh = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcoh_SHIFT);
+	bt->tcos = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcos_SHIFT);
+	bt->tacs = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tacs_SHIFT);
+	bt->tacc = get_tacc(hclk, bankcon >> S3C2410_BANKCON_Tacc_SHIFT);
+}
+
+/**
+ * s3c2410_iotiming_debugfs - debugfs show io bank timing information
+ * @seq: The seq_file to write output to using seq_printf().
+ * @cfg: The current configuration.
+ * @iob: The IO bank information to decode.
+ */
+void s3c2410_iotiming_debugfs(struct seq_file *seq,
+			      struct s3c_cpufreq_config *cfg,
+			      union s3c_iobank *iob)
+{
+	struct s3c2410_iobank_timing *bt = iob->io_2410;
+	unsigned long bankcon = bt->bankcon;
+	unsigned long hclk = cfg->freq.hclk_tns;
+	unsigned int tacs;
+	unsigned int tcos;
+	unsigned int tacc;
+	unsigned int tcoh;
+	unsigned int tcah;
+
+	seq_printf(seq, "BANKCON=0x%08lx\n", bankcon);
+
+	tcah = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcah_SHIFT);
+	tcoh = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcoh_SHIFT);
+	tcos = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tcos_SHIFT);
+	tacs = get_0124(hclk, bankcon >> S3C2410_BANKCON_Tacs_SHIFT);
+	tacc = get_tacc(hclk, bankcon >> S3C2410_BANKCON_Tacc_SHIFT);
+
+	seq_printf(seq,
+		   "\tRead: Tacs=%d.%d, Tcos=%d.%d, Tacc=%d.%d, Tcoh=%d.%d, Tcah=%d.%d\n",
+		   print_ns(bt->tacs),
+		   print_ns(bt->tcos),
+		   print_ns(bt->tacc),
+		   print_ns(bt->tcoh),
+		   print_ns(bt->tcah));
+
+	seq_printf(seq,
+		   "\t Set: Tacs=%d.%d, Tcos=%d.%d, Tacc=%d.%d, Tcoh=%d.%d, Tcah=%d.%d\n",
+		   print_ns(tacs),
+		   print_ns(tcos),
+		   print_ns(tacc),
+		   print_ns(tcoh),
+		   print_ns(tcah));
+}
+
+/**
+ * s3c2410_iotiming_calc - Calculate bank timing for frequency change.
+ * @cfg: The frequency configuration
+ * @iot: The IO timing information to fill out.
+ *
+ * Calculate the new values for the banks in @iot based on the new
+ * frequency information in @cfg. This is then used by s3c2410_iotiming_set()
+ * to update the timing when necessary.
+ */
+int s3c2410_iotiming_calc(struct s3c_cpufreq_config *cfg,
+			  struct s3c_iotimings *iot)
+{
+	struct s3c2410_iobank_timing *bt;
+	unsigned long bankcon;
+	int bank;
+	int ret;
+
+	for (bank = 0; bank < MAX_BANKS; bank++) {
+		bankcon = __raw_readl(bank_reg(bank));
+		bt = iot->bank[bank].io_2410;
+
+		if (!bt)
+			continue;
+
+		bt->bankcon = bankcon;
+
+		ret = s3c2410_calc_bank(cfg, bt);
+		if (ret) {
+			printk(KERN_ERR "%s: cannot calculate bank %d io\n",
+			       __func__, bank);
+			goto err;
+		}
+
+		s3c_freq_iodbg("%s: bank %d: con=%08lx\n",
+			       __func__, bank, bt->bankcon);
+	}
+
+	return 0;
+ err:
+	return ret;
+}
+
+/**
+ * s3c2410_iotiming_set - set the IO timings from the given setup.
+ * @cfg: The frequency configuration
+ * @iot: The IO timing information to use.
+ *
+ * Set all the currently used IO bank timing information generated
+ * by s3c2410_iotiming_calc() once the core has validated that all
+ * the new values are within permitted bounds.
+ */
+void s3c2410_iotiming_set(struct s3c_cpufreq_config *cfg,
+			  struct s3c_iotimings *iot)
+{
+	struct s3c2410_iobank_timing *bt;
+	int bank;
+
+	/* set the io timings from the specifier */
+
+	for (bank = 0; bank < MAX_BANKS; bank++) {
+		bt = iot->bank[bank].io_2410;
+		if (!bt)
+			continue;
+
+		__raw_writel(bt->bankcon, bank_reg(bank));
+	}
+}
+
+/**
+ * s3c2410_iotiming_get - Get the timing information from current registers.
+ * @cfg: The frequency configuration
+ * @timings: The IO timing information to fill out.
+ *
+ * Calculate the @timings timing information from the current frequency
+ * information in @cfg, and the new frequency configur
+ * through all the IO banks, reading the state and then updating @iot
+ * as necessary.
+ *
+ * This is used at the moment on initialisation to get the current
+ * configuration so that boards do not have to carry their own setup
+ * if the timings are correct on initialisation.
+ */
+
+int s3c2410_iotiming_get(struct s3c_cpufreq_config *cfg,
+			 struct s3c_iotimings *timings)
+{
+	struct s3c2410_iobank_timing *bt;
+	unsigned long bankcon;
+	unsigned long bwscon;
+	int bank;
+
+	bwscon = __raw_readl(S3C2410_BWSCON);
+
+	/* look through all banks to see what is currently set. */
+
+	for (bank = 0; bank < MAX_BANKS; bank++) {
+		bankcon = __raw_readl(bank_reg(bank));
+
+		if (!bank_is_io(bankcon))
+			continue;
+
+		s3c_freq_iodbg("%s: bank %d: con %08lx\n",
+			       __func__, bank, bankcon);
+
+		bt = kzalloc(sizeof(struct s3c2410_iobank_timing), GFP_KERNEL);
+		if (!bt) {
+			printk(KERN_ERR "%s: no memory for bank\n", __func__);
+			return -ENOMEM;
+		}
+
+		/* find out in nWait is enabled for bank. */
+
+		if (bank != 0) {
+			unsigned long tmp  = S3C2410_BWSCON_GET(bwscon, bank);
+			if (tmp & S3C2410_BWSCON_WS)
+				bt->nwait_en = 1;
+		}
+
+		timings->bank[bank].io_2410 = bt;
+		bt->bankcon = bankcon;
+
+		s3c2410_iotiming_getbank(cfg, bt);
+	}
+
+	s3c2410_print_timing("get", timings);
+	return 0;
+}