ENGR00121905-1 MX23: Add cpufreq support

Add cpufreq support.

Signed-off-by: Nancy Chen <Nancy.Chen@freescale.com>
Signed-off-by: Alejandro Gonzalez <alex.gonzalez@digi.com>

1 files changed, 220 insertions, 0 deletions

diff --git a/arch/arm/mach-mx23/bus_freq.c b/arch/arm/mach-mx23/bus_freq.c
new file mode 100644
index 000000000000..b4efabdfefcc
--- /dev/null
+++ b/arch/arm/mach-mx23/bus_freq.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+/*!
+ * @file bus_freq.c
+ *
+ * @brief A common API for the Freescale Semiconductor i.MXC CPUfreq module.
+ *
+ * @ingroup PM
+ */
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/spinlock.h>
+#include <linux/platform_device.h>
+#include <linux/notifier.h>
+#include <linux/cpufreq.h>
+
+#include <mach/hardware.h>
+#include <linux/io.h>
+#include <asm/system.h>
+#include <mach/clock.h>
+#include <mach/bus_freq.h>
+
+#include "regs-clkctrl.h"
+#include "regs-digctl.h"
+
+#define CLKCTRL_BASE_ADDR IO_ADDRESS(CLKCTRL_PHYS_ADDR)
+#define DIGCTRL_BASE_ADDR IO_ADDRESS(DIGCTL_PHYS_ADDR)
+#define BP_CLKCTRL_HBUS_ASM_ENABLE 20
+#define CLKCTRL_PLL_PWD_BIT 17
+#define CLKCTRL_PLL_BYPASS 0x1ff
+#define BF(value, field) (((value) << BP_##field) & BM_##field)
+
+struct profile profiles[] = {
+	{ 454736, 151580, 130910, 0, 1550000,
+	1450000, 355000, 3300000, 1750000, 0 },
+	{ 392727, 130910, 130910, 0, 1475000,
+	1375000, 225000, 3300000, 1750000, 0 },
+	{ 360000, 120000, 120000, 0, 1375000,
+	1275000, 200000, 3300000, 1750000, 0 },
+	{ 261818, 130910, 130910, 0, 1275000,
+	1175000, 173000, 3300000, 1750000, 0 },
+#ifdef CONFIG_MXS_RAM_MDDR
+	{  64000,  64000,  48000, 3, 1050000,
+	975000, 150000, 3300000, 1750000, 0 },
+	{  24000,  24000,  24000, 3, 1050000,
+	975000, 150000, 3075000, 1725000, 1 },
+#else
+	{  64000,  64000,  96000, 3, 1050000,
+	975000, 150000, 3300000, 1750000, 0 },
+	{  0,  0,  0, 0, 0,
+	0, 0, 0, 0, 0 },
+#endif
+};
+
+static struct clk *usb_clk;
+static struct clk *lcdif_clk;
+u32 clkseq_setting;
+
+int low_freq_used(void)
+{
+	if ((clk_get_usecount(usb_clk) == 0)
+	    && (clk_get_usecount(lcdif_clk) == 0))
+		return 1;
+	else
+		return 0;
+	}
+
+void hbus_auto_slow_mode_enable(void)
+{
+	__raw_writel(BP_CLKCTRL_HBUS_ASM_ENABLE,
+			CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS_SET);
+}
+EXPORT_SYMBOL(hbus_auto_slow_mode_enable);
+
+void hbus_auto_slow_mode_disable(void)
+{
+	__raw_writel(BP_CLKCTRL_HBUS_ASM_ENABLE,
+			  CLKCTRL_BASE_ADDR + HW_CLKCTRL_HBUS_CLR);
+}
+EXPORT_SYMBOL(hbus_auto_slow_mode_disable);
+
+int cpu_clk_set_pll_on(struct clk *clk, unsigned int freq)
+{
+	struct cpufreq_freqs freqs;
+
+	freqs.old = clk_get_rate(clk);
+	freqs.cpu = 0;
+	freqs.new = freq;
+
+	if (freqs.old == 24000 && freqs.new > 24000) {
+		/* turn pll on */
+		__raw_writel(CLKCTRL_PLL_PWD_BIT, CLKCTRL_BASE_ADDR +
+			      HW_CLKCTRL_PLLCTRL0_SET);
+		udelay(10);
+	} else if (freqs.old > 24000 && freqs.new == 24000)
+		clkseq_setting = __raw_readl(CLKCTRL_BASE_ADDR +
+						 HW_CLKCTRL_CLKSEQ);
+	return 0;
+}
+
+int cpu_clk_set_pll_off(struct clk *clk, unsigned int freq)
+{
+	struct cpufreq_freqs freqs;
+
+	freqs.old = clk_get_rate(clk);
+	freqs.cpu = 0;
+	freqs.new = freq;
+
+	if (freqs.old > 24000 && freqs.new == 24000) {
+		/* turn pll off */
+		__raw_writel(CLKCTRL_PLL_PWD_BIT, CLKCTRL_BASE_ADDR +
+			      HW_CLKCTRL_PLLCTRL0_CLR);
+		__raw_writel(CLKCTRL_PLL_BYPASS, CLKCTRL_BASE_ADDR +
+			      HW_CLKCTRL_CLKSEQ);
+	} else if (freqs.old == 24000 && freqs.new > 24000)
+		__raw_writel(clkseq_setting, CLKCTRL_BASE_ADDR +
+				HW_CLKCTRL_CLKSEQ);
+
+	return 0;
+}
+
+int timing_ctrl_rams(int ss)
+{
+	__raw_writel(BF(ss, DIGCTL_ARMCACHE_VALID_SS) |
+				      BF(ss, DIGCTL_ARMCACHE_DRTY_SS) |
+				      BF(ss, DIGCTL_ARMCACHE_CACHE_SS) |
+				      BF(ss, DIGCTL_ARMCACHE_DTAG_SS) |
+				      BF(ss, DIGCTL_ARMCACHE_ITAG_SS),
+				      DIGCTRL_BASE_ADDR + HW_DIGCTL_ARMCACHE);
+	return 0;
+}
+
+/*!
+ * This is the probe routine for the bus frequency driver.
+ *
+ * @param   pdev   The platform device structure
+ *
+ * @return         The function returns 0 on success
+ *
+ */
+static int __devinit busfreq_probe(struct platform_device *pdev)
+{
+	int ret = 0;
+
+	usb_clk = clk_get(NULL, "usb_clk0");
+	if (IS_ERR(usb_clk)) {
+		ret = PTR_ERR(usb_clk);
+		goto out_usb;
+	}
+
+	lcdif_clk = clk_get(NULL, "lcdif");
+	if (IS_ERR(lcdif_clk)) {
+		ret = PTR_ERR(lcdif_clk);
+		goto out_lcd;
+	}
+	return 0;
+
+out_lcd:
+	clk_put(usb_clk);
+out_usb:
+	return ret;
+}
+
+static struct platform_driver busfreq_driver = {
+	.driver = {
+		   .name = "busfreq",
+		},
+	.probe = busfreq_probe,
+};
+
+/*!
+ * Initialise the busfreq_driver.
+ *
+ * @return  The function always returns 0.
+ */
+
+static int __init busfreq_init(void)
+{
+	if (platform_driver_register(&busfreq_driver) != 0) {
+		printk(KERN_ERR "busfreq_driver register failed\n");
+		return -ENODEV;
+	}
+
+	printk(KERN_INFO "Bus freq driver module loaded\n");
+	return 0;
+}
+
+static void __exit busfreq_cleanup(void)
+{
+	/* Unregister the device structure */
+	platform_driver_unregister(&busfreq_driver);
+}
+
+module_init(busfreq_init);
+module_exit(busfreq_cleanup);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("BusFreq driver");
+MODULE_LICENSE("GPL");