Merge branch 'next-s3c24xx-cpufreq' into next-s3c

12 files changed, 387 insertions, 3 deletions

diff --git a/arch/arm/mach-s3c2410/Kconfig b/arch/arm/mach-s3c2410/Kconfig
index 41bb65d5b91..d8c023d4df3 100644
--- a/arch/arm/mach-s3c2410/Kconfig
+++ b/arch/arm/mach-s3c2410/Kconfig
@@ -12,6 +12,7 @@ config CPU_S3C2410
 	select S3C2410_GPIO
 	select CPU_LLSERIAL_S3C2410
 	select S3C2410_PM if PM
+	select S3C2410_CPUFREQ if CPU_FREQ_S3C24XX
 	help
 	  Support for S3C2410 and S3C2410A family from the S3C24XX line
 	  of Samsung Mobile CPUs.
@@ -45,6 +46,22 @@ config MACH_BAST_IDE
 	  Internal node for machines with an BAST style IDE
 	  interface
 
+# cpu frequency scaling support
+
+config S3C2410_CPUFREQ
+	bool
+	depends on CPU_FREQ_S3C24XX && CPU_S3C2410
+	select S3C2410_CPUFREQ_UTILS
+	help
+	  CPU Frequency scaling support for S3C2410
+
+config S3C2410_PLLTABLE
+	bool
+	depends on S3C2410_CPUFREQ && CPU_FREQ_S3C24XX_PLL
+	default y
+	help
+	  Select the PLL table for the S3C2410
+
 menu "S3C2410 Machines"
 
 config ARCH_SMDK2410
@@ -79,6 +96,7 @@ config MACH_N30
 config ARCH_BAST
 	bool "Simtec Electronics BAST (EB2410ITX)"
 	select CPU_S3C2410
+	select S3C2410_IOTIMING if S3C2410_CPUFREQ
 	select PM_SIMTEC if PM
 	select SIMTEC_NOR
 	select MACH_BAST_IDE
diff --git a/arch/arm/mach-s3c2410/Makefile b/arch/arm/mach-s3c2410/Makefile
index fca02f82711..2ab5ba4b266 100644
--- a/arch/arm/mach-s3c2410/Makefile
+++ b/arch/arm/mach-s3c2410/Makefile
@@ -15,6 +15,8 @@ obj-$(CONFIG_CPU_S3C2410_DMA)	+= dma.o
 obj-$(CONFIG_CPU_S3C2410_DMA)	+= dma.o
 obj-$(CONFIG_S3C2410_PM)	+= pm.o sleep.o
 obj-$(CONFIG_S3C2410_GPIO)	+= gpio.o
+obj-$(CONFIG_S3C2410_CPUFREQ)	+= cpu-freq.o
+obj-$(CONFIG_S3C2410_PLLTABLE)	+= pll.o
 
 # Machine support
 
diff --git a/arch/arm/mach-s3c2410/cpu-freq.c b/arch/arm/mach-s3c2410/cpu-freq.c
new file mode 100644
index 00000000000..9d1186877d0
--- /dev/null
+++ b/arch/arm/mach-s3c2410/cpu-freq.c
@@ -0,0 +1,159 @@
+/* linux/arch/arm/mach-s3c2410/cpu-freq.c
+ *
+ * Copyright (c) 2006,2008 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2410 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/sysdev.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include <mach/regs-clock.h>
+
+#include <plat/cpu.h>
+#include <plat/clock.h>
+#include <plat/cpu-freq-core.h>
+
+/* Note, 2410A has an extra mode for 1:4:4 ratio, bit 2 of CLKDIV */
+
+static void s3c2410_cpufreq_setdivs(struct s3c_cpufreq_config *cfg)
+{
+	u32 clkdiv = 0;
+
+	if (cfg->divs.h_divisor == 2)
+		clkdiv |= S3C2410_CLKDIVN_HDIVN;
+
+	if (cfg->divs.p_divisor != cfg->divs.h_divisor)
+		clkdiv |= S3C2410_CLKDIVN_PDIVN;
+
+	__raw_writel(clkdiv, S3C2410_CLKDIVN);
+}
+
+static int s3c2410_cpufreq_calcdivs(struct s3c_cpufreq_config *cfg)
+{
+	unsigned long hclk, fclk, pclk;
+	unsigned int hdiv, pdiv;
+	unsigned long hclk_max;
+
+	fclk = cfg->freq.fclk;
+	hclk_max = cfg->max.hclk;
+
+	cfg->freq.armclk = fclk;
+
+	s3c_freq_dbg("%s: fclk is %lu, max hclk %lu\n",
+		      __func__, fclk, hclk_max);
+
+	hdiv = (fclk > cfg->max.hclk) ? 2 : 1;
+	hclk = fclk / hdiv;
+
+	if (hclk > cfg->max.hclk) {
+		s3c_freq_dbg("%s: hclk too big\n", __func__);
+		return -EINVAL;
+	}
+
+	pdiv = (hclk > cfg->max.pclk) ? 2 : 1;
+	pclk = hclk / pdiv;
+
+	if (pclk > cfg->max.pclk) {
+		s3c_freq_dbg("%s: pclk too big\n", __func__);
+		return -EINVAL;
+	}
+
+	pdiv *= hdiv;
+
+	/* record the result */
+	cfg->divs.p_divisor = pdiv;
+	cfg->divs.h_divisor = hdiv;
+
+	return 0      ;
+}
+
+static struct s3c_cpufreq_info s3c2410_cpufreq_info = {
+	.max		= {
+		.fclk	= 200000000,
+		.hclk	= 100000000,
+		.pclk	=  50000000,
+	},
+
+	/* transition latency is about 5ms worst-case, so
+	 * set 10ms to be sure */
+	.latency	= 10000000,
+
+	.locktime_m	= 150,
+	.locktime_u	= 150,
+	.locktime_bits	= 12,
+
+	.need_pll	= 1,
+
+	.name		= "s3c2410",
+	.calc_iotiming	= s3c2410_iotiming_calc,
+	.set_iotiming	= s3c2410_iotiming_set,
+	.get_iotiming	= s3c2410_iotiming_get,
+	.resume_clocks	= s3c2410_setup_clocks,
+
+	.set_fvco	= s3c2410_set_fvco,
+	.set_refresh	= s3c2410_cpufreq_setrefresh,
+	.set_divs	= s3c2410_cpufreq_setdivs,
+	.calc_divs	= s3c2410_cpufreq_calcdivs,
+
+	.debug_io_show	= s3c_cpufreq_debugfs_call(s3c2410_iotiming_debugfs),
+};
+
+static int s3c2410_cpufreq_add(struct sys_device *sysdev)
+{
+	return s3c_cpufreq_register(&s3c2410_cpufreq_info);
+}
+
+static struct sysdev_driver s3c2410_cpufreq_driver = {
+	.add		= s3c2410_cpufreq_add,
+};
+
+static int __init s3c2410_cpufreq_init(void)
+{
+	return sysdev_driver_register(&s3c2410_sysclass,
+				      &s3c2410_cpufreq_driver);
+}
+
+arch_initcall(s3c2410_cpufreq_init);
+
+static int s3c2410a_cpufreq_add(struct sys_device *sysdev)
+{
+	/* alter the maximum freq settings for S3C2410A. If a board knows
+	 * it only has a maximum of 200, then it should register its own
+	 * limits. */
+
+	s3c2410_cpufreq_info.max.fclk = 266000000;
+	s3c2410_cpufreq_info.max.hclk = 133000000;
+	s3c2410_cpufreq_info.max.pclk =  66500000;
+	s3c2410_cpufreq_info.name = "s3c2410a";
+
+	return s3c2410_cpufreq_add(sysdev);
+}
+
+static struct sysdev_driver s3c2410a_cpufreq_driver = {
+	.add		= s3c2410a_cpufreq_add,
+};
+
+static int __init s3c2410a_cpufreq_init(void)
+{
+	return sysdev_driver_register(&s3c2410a_sysclass,
+				      &s3c2410a_cpufreq_driver);
+}
+
+arch_initcall(s3c2410a_cpufreq_init);
diff --git a/arch/arm/mach-s3c2410/dma.c b/arch/arm/mach-s3c2410/dma.c
index dbf96e60d99..63b753f56c6 100644
--- a/arch/arm/mach-s3c2410/dma.c
+++ b/arch/arm/mach-s3c2410/dma.c
@@ -164,6 +164,17 @@ static int __init s3c2410_dma_drvinit(void)
 }
 
 arch_initcall(s3c2410_dma_drvinit);
+
+static struct sysdev_driver s3c2410a_dma_driver = {
+	.add	= s3c2410_dma_add,
+};
+
+static int __init s3c2410a_dma_drvinit(void)
+{
+	return sysdev_driver_register(&s3c2410a_sysclass, &s3c2410a_dma_driver);
+}
+
+arch_initcall(s3c2410a_dma_drvinit);
 #endif
 
 #if defined(CONFIG_CPU_S3C2442)
diff --git a/arch/arm/mach-s3c2410/include/mach/map.h b/arch/arm/mach-s3c2410/include/mach/map.h
index e99b212cb1c..11cce097550 100644
--- a/arch/arm/mach-s3c2410/include/mach/map.h
+++ b/arch/arm/mach-s3c2410/include/mach/map.h
@@ -67,6 +67,13 @@
 #define S3C2443_PA_HSMMC   (0x4A800000)
 #define S3C2443_SZ_HSMMC   (256)
 
+/* S3C2412 memory and IO controls */
+#define S3C2412_PA_SSMC	(0x4F000000)
+#define S3C2412_VA_SSMC	S3C_ADDR_CPU(0x00000000)
+
+#define S3C2412_PA_EBI	(0x48800000)
+#define S3C2412_VA_EBI	S3C_ADDR_CPU(0x00010000)
+
 /* physical addresses of all the chip-select areas */
 
 #define S3C2410_CS0 (0x00000000)
diff --git a/arch/arm/mach-s3c2410/include/mach/regs-mem.h b/arch/arm/mach-s3c2410/include/mach/regs-mem.h
index 57759804e2f..7f7c5294796 100644
--- a/arch/arm/mach-s3c2410/include/mach/regs-mem.h
+++ b/arch/arm/mach-s3c2410/include/mach/regs-mem.h
@@ -73,6 +73,16 @@
 #define S3C2410_BWSCON_WS7		(1<<30)
 #define S3C2410_BWSCON_ST7		(1<<31)
 
+/* accesor functions for getting BANK(n) configuration. (n != 0) */
+
+#define S3C2410_BWSCON_GET(_bwscon, _bank) (((_bwscon) >> ((_bank) * 4)) & 0xf)
+
+#define S3C2410_BWSCON_DW8		(0)
+#define S3C2410_BWSCON_DW16		(1)
+#define S3C2410_BWSCON_DW32		(2)
+#define S3C2410_BWSCON_WS		(1 << 2)
+#define S3C2410_BWSCON_ST		(1 << 3)
+
 /* memory set (rom, ram) */
 #define S3C2410_BANKCON0		S3C2410_MEMREG(0x0004)
 #define S3C2410_BANKCON1		S3C2410_MEMREG(0x0008)
diff --git a/arch/arm/mach-s3c2410/include/mach/regs-s3c2412-mem.h b/arch/arm/mach-s3c2410/include/mach/regs-s3c2412-mem.h
index a4bf2712317..fb635251509 100644
--- a/arch/arm/mach-s3c2410/include/mach/regs-s3c2412-mem.h
+++ b/arch/arm/mach-s3c2410/include/mach/regs-s3c2412-mem.h
@@ -14,9 +14,11 @@
 #ifndef __ASM_ARM_REGS_S3C2412_MEM
 #define __ASM_ARM_REGS_S3C2412_MEM
 
-#ifndef S3C2412_MEMREG
 #define S3C2412_MEMREG(x) (S3C24XX_VA_MEMCTRL + (x))
-#endif
+#define S3C2412_EBIREG(x) (S3C2412_VA_EBI + (x))
+
+#define S3C2412_SSMCREG(x) (S3C2412_VA_SSMC + (x))
+#define S3C2412_SSMC(x, o) (S3C2412_SSMCREG((x * 0x20) + (o)))
 
 #define S3C2412_BANKCFG			S3C2412_MEMREG(0x00)
 #define S3C2412_BANKCON1		S3C2412_MEMREG(0x04)
@@ -26,4 +28,21 @@
 #define S3C2412_REFRESH			S3C2412_MEMREG(0x10)
 #define S3C2412_TIMEOUT			S3C2412_MEMREG(0x14)
 
+/* EBI control registers */
+
+#define S3C2412_EBI_PR			S3C2412_EBIREG(0x00)
+#define S3C2412_EBI_BANKCFG		S3C2412_EBIREG(0x04)
+
+/* SSMC control registers */
+
+#define S3C2412_SSMC_BANK(x)		S3C2412_SSMC(x, 0x00)
+#define S3C2412_SMIDCYR(x)		S3C2412_SSMC(x, 0x00)
+#define S3C2412_SMBWSTRD(x)		S3C2412_SSMC(x, 0x04)
+#define S3C2412_SMBWSTWRR(x)		S3C2412_SSMC(x, 0x08)
+#define S3C2412_SMBWSTOENR(x)		S3C2412_SSMC(x, 0x0C)
+#define S3C2412_SMBWSTWENR(x)		S3C2412_SSMC(x, 0x10)
+#define S3C2412_SMBCR(x)		S3C2412_SSMC(x, 0x14)
+#define S3C2412_SMBSR(x)		S3C2412_SSMC(x, 0x18)
+#define S3C2412_SMBWSTBRDR(x)		S3C2412_SSMC(x, 0x1C)
+
 #endif /*  __ASM_ARM_REGS_S3C2412_MEM */
diff --git a/arch/arm/mach-s3c2410/irq.c b/arch/arm/mach-s3c2410/irq.c
index 92150399563..5e2f3533205 100644
--- a/arch/arm/mach-s3c2410/irq.c
+++ b/arch/arm/mach-s3c2410/irq.c
@@ -39,9 +39,22 @@ static struct sysdev_driver s3c2410_irq_driver = {
 	.resume		= s3c24xx_irq_resume,
 };
 
-static int s3c2410_irq_init(void)
+static int __init s3c2410_irq_init(void)
 {
 	return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_irq_driver);
 }
 
 arch_initcall(s3c2410_irq_init);
+
+static struct sysdev_driver s3c2410a_irq_driver = {
+	.add		= s3c2410_irq_add,
+	.suspend	= s3c24xx_irq_suspend,
+	.resume		= s3c24xx_irq_resume,
+};
+
+static int __init s3c2410a_irq_init(void)
+{
+	return sysdev_driver_register(&s3c2410a_sysclass, &s3c2410a_irq_driver);
+}
+
+arch_initcall(s3c2410a_irq_init);
diff --git a/arch/arm/mach-s3c2410/mach-bast.c b/arch/arm/mach-s3c2410/mach-bast.c
index 06670bb89ca..647c9adb018 100644
--- a/arch/arm/mach-s3c2410/mach-bast.c
+++ b/arch/arm/mach-s3c2410/mach-bast.c
@@ -60,6 +60,7 @@
 #include <plat/clock.h>
 #include <plat/devs.h>
 #include <plat/cpu.h>
+#include <plat/cpu-freq.h>
 
 #include "usb-simtec.h"
 #include "nor-simtec.h"
@@ -601,6 +602,12 @@ static struct clk *bast_clocks[] __initdata = {
 	&s3c24xx_uclk,
 };
 
+static struct s3c_cpufreq_board __initdata bast_cpufreq = {
+	.refresh	= 7800, /* 7.8usec */
+	.auto_io	= 1,
+	.need_io	= 1,
+};
+
 static void __init bast_map_io(void)
 {
 	/* initialise the clocks */
@@ -640,6 +647,8 @@ static void __init bast_init(void)
 
 	usb_simtec_init();
 	nor_simtec_init();
+
+	s3c_cpufreq_setboard(&bast_cpufreq);
 }
 
 MACHINE_START(BAST, "Simtec-BAST")
diff --git a/arch/arm/mach-s3c2410/pll.c b/arch/arm/mach-s3c2410/pll.c
new file mode 100644
index 00000000000..f178c2fd9d8
--- /dev/null
+++ b/arch/arm/mach-s3c2410/pll.c
@@ -0,0 +1,95 @@
+/* arch/arm/mach-s3c2410/pll.c
+ *
+ * Copyright (c) 2006,2007 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ *	Vincent Sanders <vince@arm.linux.org.uk>
+ *
+ * S3C2410 CPU PLL tables
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/sysdev.h>
+#include <linux/list.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include <plat/cpu.h>
+#include <plat/cpu-freq-core.h>
+
+static struct cpufreq_frequency_table pll_vals_12MHz[] = {
+    { .frequency = 34000000,  .index = PLLVAL(82, 2, 3),   },
+    { .frequency = 45000000,  .index = PLLVAL(82, 1, 3),   },
+    { .frequency = 51000000,  .index = PLLVAL(161, 3, 3),  },
+    { .frequency = 48000000,  .index = PLLVAL(120, 2, 3),  },
+    { .frequency = 56000000,  .index = PLLVAL(142, 2, 3),  },
+    { .frequency = 68000000,  .index = PLLVAL(82, 2, 2),   },
+    { .frequency = 79000000,  .index = PLLVAL(71, 1, 2),   },
+    { .frequency = 85000000,  .index = PLLVAL(105, 2, 2),  },
+    { .frequency = 90000000,  .index = PLLVAL(112, 2, 2),  },
+    { .frequency = 101000000, .index = PLLVAL(127, 2, 2),  },
+    { .frequency = 113000000, .index = PLLVAL(105, 1, 2),  },
+    { .frequency = 118000000, .index = PLLVAL(150, 2, 2),  },
+    { .frequency = 124000000, .index = PLLVAL(116, 1, 2),  },
+    { .frequency = 135000000, .index = PLLVAL(82, 2, 1),   },
+    { .frequency = 147000000, .index = PLLVAL(90, 2, 1),   },
+    { .frequency = 152000000, .index = PLLVAL(68, 1, 1),   },
+    { .frequency = 158000000, .index = PLLVAL(71, 1, 1),   },
+    { .frequency = 170000000, .index = PLLVAL(77, 1, 1),   },
+    { .frequency = 180000000, .index = PLLVAL(82, 1, 1),   },
+    { .frequency = 186000000, .index = PLLVAL(85, 1, 1),   },
+    { .frequency = 192000000, .index = PLLVAL(88, 1, 1),   },
+    { .frequency = 203000000, .index = PLLVAL(161, 3, 1),  },
+
+    /* 2410A extras */
+
+    { .frequency = 210000000, .index = PLLVAL(132, 2, 1),  },
+    { .frequency = 226000000, .index = PLLVAL(105, 1, 1),  },
+    { .frequency = 266000000, .index = PLLVAL(125, 1, 1),  },
+    { .frequency = 268000000, .index = PLLVAL(126, 1, 1),  },
+    { .frequency = 270000000, .index = PLLVAL(127, 1, 1),  },
+};
+
+static int s3c2410_plls_add(struct sys_device *dev)
+{
+	return s3c_plltab_register(pll_vals_12MHz, ARRAY_SIZE(pll_vals_12MHz));
+}
+
+static struct sysdev_driver s3c2410_plls_drv = {
+	.add	= s3c2410_plls_add,
+};
+
+static int __init s3c2410_pll_init(void)
+{
+	return sysdev_driver_register(&s3c2410_sysclass, &s3c2410_plls_drv);
+
+}
+
+arch_initcall(s3c2410_pll_init);
+
+static struct sysdev_driver s3c2410a_plls_drv = {
+	.add	= s3c2410_plls_add,
+};
+
+static int __init s3c2410a_pll_init(void)
+{
+	return sysdev_driver_register(&s3c2410a_sysclass, &s3c2410a_plls_drv);
+}
+
+arch_initcall(s3c2410a_pll_init);
diff --git a/arch/arm/mach-s3c2410/pm.c b/arch/arm/mach-s3c2410/pm.c
index 143e08a599d..966119c8efe 100644
--- a/arch/arm/mach-s3c2410/pm.c
+++ b/arch/arm/mach-s3c2410/pm.c
@@ -119,6 +119,18 @@ static int __init s3c2410_pm_drvinit(void)
 }
 
 arch_initcall(s3c2410_pm_drvinit);
+
+static struct sysdev_driver s3c2410a_pm_driver = {
+	.add		= s3c2410_pm_add,
+	.resume		= s3c2410_pm_resume,
+};
+
+static int __init s3c2410a_pm_drvinit(void)
+{
+	return sysdev_driver_register(&s3c2410a_sysclass, &s3c2410a_pm_driver);
+}
+
+arch_initcall(s3c2410a_pm_drvinit);
 #endif
 
 #if defined(CONFIG_CPU_S3C2440)
diff --git a/arch/arm/mach-s3c2410/s3c2410.c b/arch/arm/mach-s3c2410/s3c2410.c
index feb141b1f91..91ba42f688a 100644
--- a/arch/arm/mach-s3c2410/s3c2410.c
+++ b/arch/arm/mach-s3c2410/s3c2410.c
@@ -105,17 +105,33 @@ void __init_or_cpufreq s3c2410_setup_clocks(void)
 	s3c24xx_setup_clocks(fclk, hclk, pclk);
 }
 
+/* fake ARMCLK for use with cpufreq, etc. */
+
+static struct clk s3c2410_armclk = {
+	.name	= "armclk",
+	.parent	= &clk_f,
+	.id	= -1,
+};
+
 void __init s3c2410_init_clocks(int xtal)
 {
 	s3c24xx_register_baseclocks(xtal);
 	s3c2410_setup_clocks();
 	s3c2410_baseclk_add();
+	s3c24xx_register_clock(&s3c2410_armclk);
 }
 
 struct sysdev_class s3c2410_sysclass = {
 	.name = "s3c2410-core",
 };
 
+/* Note, we would have liked to name this s3c2410-core, but we cannot
+ * register two sysdev_class with the same name.
+ */
+struct sysdev_class s3c2410a_sysclass = {
+	.name = "s3c2410a-core",
+};
+
 static struct sys_device s3c2410_sysdev = {
 	.cls		= &s3c2410_sysclass,
 };
@@ -133,9 +149,22 @@ static int __init s3c2410_core_init(void)
 
 core_initcall(s3c2410_core_init);
 
+static int __init s3c2410a_core_init(void)
+{
+	return sysdev_class_register(&s3c2410a_sysclass);
+}
+
+core_initcall(s3c2410a_core_init);
+
 int __init s3c2410_init(void)
 {
 	printk("S3C2410: Initialising architecture\n");
 
 	return sysdev_register(&s3c2410_sysdev);
 }
+
+int __init s3c2410a_init(void)
+{
+	s3c2410_sysdev.cls = &s3c2410a_sysclass;
+	return s3c2410_init();
+}