Re: [PATCH v2] cpufreq: exynos: Fix driver compilation with ARCH_MULTIPLATFORM

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On 05/24/14 00:22, Tomasz Figa wrote:
Currently Exynos cpufreq drivers rely on globally mapped clock
controller registers to configure frequency of CPU cores. This is
obviously wrong and will be removed in near future, but to enable
support for multi-platform builds without introducing a regression it
needs to be worked around.

This patch hacks the code to look for clock controller node in device
tree and map its registers using of_iomap(), instead of relying on
global mapping, so dependencies on platform headers are removed and the
driver can compile again with multiplatform support.

Signed-off-by: Tomasz Figa<t.figa@xxxxxxxxxxx>
---
  drivers/cpufreq/Kconfig.arm          |  6 ++---
  drivers/cpufreq/exynos-cpufreq.c     |  2 --
  drivers/cpufreq/exynos-cpufreq.h     | 30 ++++++++++++-------------
  drivers/cpufreq/exynos4210-cpufreq.c | 39 +++++++++++++++++++++++++++-----
  drivers/cpufreq/exynos4x12-cpufreq.c | 40 ++++++++++++++++++++++++++++-----
  drivers/cpufreq/exynos5250-cpufreq.c | 43 +++++++++++++++++++++++++++++-------
  6 files changed, 119 insertions(+), 41 deletions(-)

Viresh,

I'm not sure Thomas' v5 cpufreq-cpu0 driver can be upstreamed for 3.16 because of dependency with others, some of them got ack though...

* "PM / OPP: move cpufreq specific helpers out of OPP layer"
- https://www.mail-archive.com/linux-omap@xxxxxxxxxxxxxxx/msg104610.html
* "cpufreq: opp: Add device tree based lookup of boost mode frequency"
- http://www.spinics.net/lists/arm-kernel/msg334336.html

So firstly, I've queued this instead with exynos-multiplatform series...

How do you think?

- Kukjin

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 6a7dd3e..36d20d0 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -31,7 +31,7 @@ config ARM_EXYNOS_CPUFREQ

  config ARM_EXYNOS4210_CPUFREQ
  	bool "SAMSUNG EXYNOS4210"
-	depends on CPU_EXYNOS4210&&  !ARCH_MULTIPLATFORM
+	depends on CPU_EXYNOS4210
  	default y
  	select ARM_EXYNOS_CPUFREQ
  	help
@@ -42,7 +42,7 @@ config ARM_EXYNOS4210_CPUFREQ

  config ARM_EXYNOS4X12_CPUFREQ
  	bool "SAMSUNG EXYNOS4x12"
-	depends on (SOC_EXYNOS4212 || SOC_EXYNOS4412)&&  !ARCH_MULTIPLATFORM
+	depends on SOC_EXYNOS4212 || SOC_EXYNOS4412
  	default y
  	select ARM_EXYNOS_CPUFREQ
  	help
@@ -53,7 +53,7 @@ config ARM_EXYNOS4X12_CPUFREQ

  config ARM_EXYNOS5250_CPUFREQ
  	bool "SAMSUNG EXYNOS5250"
-	depends on SOC_EXYNOS5250&&  !ARCH_MULTIPLATFORM
+	depends on SOC_EXYNOS5250
  	default y
  	select ARM_EXYNOS_CPUFREQ
  	help
diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index 7c2a096..1e0ec57 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -19,8 +19,6 @@
  #include<linux/platform_device.h>
  #include<linux/of.h>

-#include<plat/cpu.h>
-
  #include "exynos-cpufreq.h"

  static struct exynos_dvfs_info *exynos_info;
diff --git a/drivers/cpufreq/exynos-cpufreq.h b/drivers/cpufreq/exynos-cpufreq.h
index a28ee9d..8dfebac 100644
--- a/drivers/cpufreq/exynos-cpufreq.h
+++ b/drivers/cpufreq/exynos-cpufreq.h
@@ -50,6 +50,7 @@ struct exynos_dvfs_info {
  	struct cpufreq_frequency_table	*freq_table;
  	void (*set_freq)(unsigned int, unsigned int);
  	bool (*need_apll_change)(unsigned int, unsigned int);
+	void __iomem	*cmu_regs;
  };

  #ifdef CONFIG_ARM_EXYNOS4210_CPUFREQ
@@ -77,24 +78,21 @@ static inline int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
  }
  #endif

-#include<plat/cpu.h>
-#include<mach/map.h>
+#define EXYNOS4_CLKSRC_CPU			0x14200
+#define EXYNOS4_CLKMUX_STATCPU			0x14400

-#define EXYNOS4_CLKSRC_CPU			(S5P_VA_CMU + 0x14200)
-#define EXYNOS4_CLKMUX_STATCPU			(S5P_VA_CMU + 0x14400)
-
-#define EXYNOS4_CLKDIV_CPU			(S5P_VA_CMU + 0x14500)
-#define EXYNOS4_CLKDIV_CPU1			(S5P_VA_CMU + 0x14504)
-#define EXYNOS4_CLKDIV_STATCPU			(S5P_VA_CMU + 0x14600)
-#define EXYNOS4_CLKDIV_STATCPU1			(S5P_VA_CMU + 0x14604)
+#define EXYNOS4_CLKDIV_CPU			0x14500
+#define EXYNOS4_CLKDIV_CPU1			0x14504
+#define EXYNOS4_CLKDIV_STATCPU			0x14600
+#define EXYNOS4_CLKDIV_STATCPU1			0x14604

  #define EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT	(16)
  #define EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK	(0x7<<  EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT)

-#define EXYNOS5_APLL_LOCK			(S5P_VA_CMU + 0x00000)
-#define EXYNOS5_APLL_CON0			(S5P_VA_CMU + 0x00100)
-#define EXYNOS5_CLKMUX_STATCPU			(S5P_VA_CMU + 0x00400)
-#define EXYNOS5_CLKDIV_CPU0			(S5P_VA_CMU + 0x00500)
-#define EXYNOS5_CLKDIV_CPU1			(S5P_VA_CMU + 0x00504)
-#define EXYNOS5_CLKDIV_STATCPU0			(S5P_VA_CMU + 0x00600)
-#define EXYNOS5_CLKDIV_STATCPU1			(S5P_VA_CMU + 0x00604)
+#define EXYNOS5_APLL_LOCK			0x00000
+#define EXYNOS5_APLL_CON0			0x00100
+#define EXYNOS5_CLKMUX_STATCPU			0x00400
+#define EXYNOS5_CLKDIV_CPU0			0x00500
+#define EXYNOS5_CLKDIV_CPU1			0x00504
+#define EXYNOS5_CLKDIV_STATCPU0			0x00600
+#define EXYNOS5_CLKDIV_STATCPU1			0x00604
diff --git a/drivers/cpufreq/exynos4210-cpufreq.c b/drivers/cpufreq/exynos4210-cpufreq.c
index 6384e5b..61a5431 100644
--- a/drivers/cpufreq/exynos4210-cpufreq.c
+++ b/drivers/cpufreq/exynos4210-cpufreq.c
@@ -16,6 +16,8 @@
  #include<linux/io.h>
  #include<linux/slab.h>
  #include<linux/cpufreq.h>
+#include<linux/of.h>
+#include<linux/of_address.h>

  #include "exynos-cpufreq.h"

@@ -23,6 +25,7 @@ static struct clk *cpu_clk;
  static struct clk *moutcore;
  static struct clk *mout_mpll;
  static struct clk *mout_apll;
+static struct exynos_dvfs_info *cpufreq;

  static unsigned int exynos4210_volt_table[] = {
  	1250000, 1150000, 1050000, 975000, 950000,
@@ -60,20 +63,20 @@ static void exynos4210_set_clkdiv(unsigned int div_index)

  	tmp = apll_freq_4210[div_index].clk_div_cpu0;

-	__raw_writel(tmp, EXYNOS4_CLKDIV_CPU);
+	__raw_writel(tmp, cpufreq->cmu_regs + EXYNOS4_CLKDIV_CPU);

  	do {
-		tmp = __raw_readl(EXYNOS4_CLKDIV_STATCPU);
+		tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKDIV_STATCPU);
  	} while (tmp&  0x1111111);

  	/* Change Divider - CPU1 */

  	tmp = apll_freq_4210[div_index].clk_div_cpu1;

-	__raw_writel(tmp, EXYNOS4_CLKDIV_CPU1);
+	__raw_writel(tmp, cpufreq->cmu_regs + EXYNOS4_CLKDIV_CPU1);

  	do {
-		tmp = __raw_readl(EXYNOS4_CLKDIV_STATCPU1);
+		tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKDIV_STATCPU1);
  	} while (tmp&  0x11);
  }

@@ -85,7 +88,7 @@ static void exynos4210_set_apll(unsigned int index)
  	clk_set_parent(moutcore, mout_mpll);

  	do {
-		tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU)
+		tmp = (__raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKMUX_STATCPU)
  			>>  EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT);
  		tmp&= 0x7;
  	} while (tmp != 0x2);
@@ -96,7 +99,7 @@ static void exynos4210_set_apll(unsigned int index)
  	clk_set_parent(moutcore, mout_apll);

  	do {
-		tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU);
+		tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKMUX_STATCPU);
  		tmp&= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK;
  	} while (tmp != (0x1<<  EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT));
  }
@@ -115,8 +118,30 @@ static void exynos4210_set_frequency(unsigned int old_index,

  int exynos4210_cpufreq_init(struct exynos_dvfs_info *info)
  {
+	struct device_node *np;
  	unsigned long rate;

+	/*
+	 * HACK: This is a temporary workaround to get access to clock
+	 * controller registers directly and remove static mappings and
+	 * dependencies on platform headers. It is necessary to enable
+	 * Exynos multi-platform support and will be removed together with
+	 * this whole driver as soon as Exynos gets migrated to use
+	 * cpufreq-cpu0 driver.
+	 */
+	np = of_find_compatible_node(NULL, NULL, "samsung,exynos4210-clock");
+	if (!np) {
+		pr_err("%s: failed to find clock controller DT node\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	info->cmu_regs = of_iomap(np, 0);
+	if (!info->cmu_regs) {
+		pr_err("%s: failed to map CMU registers\n", __func__);
+		return -EFAULT;
+	}
+
  	cpu_clk = clk_get(NULL, "armclk");
  	if (IS_ERR(cpu_clk))
  		return PTR_ERR(cpu_clk);
@@ -143,6 +168,8 @@ int exynos4210_cpufreq_init(struct exynos_dvfs_info *info)
  	info->freq_table = exynos4210_freq_table;
  	info->set_freq = exynos4210_set_frequency;

+	cpufreq = info;
+
  	return 0;

  err_mout_apll:
diff --git a/drivers/cpufreq/exynos4x12-cpufreq.c b/drivers/cpufreq/exynos4x12-cpufreq.c
index 63a3907..351a207 100644
--- a/drivers/cpufreq/exynos4x12-cpufreq.c
+++ b/drivers/cpufreq/exynos4x12-cpufreq.c
@@ -16,6 +16,8 @@
  #include<linux/io.h>
  #include<linux/slab.h>
  #include<linux/cpufreq.h>
+#include<linux/of.h>
+#include<linux/of_address.h>

  #include "exynos-cpufreq.h"

@@ -23,6 +25,7 @@ static struct clk *cpu_clk;
  static struct clk *moutcore;
  static struct clk *mout_mpll;
  static struct clk *mout_apll;
+static struct exynos_dvfs_info *cpufreq;

  static unsigned int exynos4x12_volt_table[] = {
  	1350000, 1287500, 1250000, 1187500, 1137500, 1087500, 1037500,
@@ -105,19 +108,20 @@ static void exynos4x12_set_clkdiv(unsigned int div_index)

  	tmp = apll_freq_4x12[div_index].clk_div_cpu0;

-	__raw_writel(tmp, EXYNOS4_CLKDIV_CPU);
+	__raw_writel(tmp, cpufreq->cmu_regs + EXYNOS4_CLKDIV_CPU);

-	while (__raw_readl(EXYNOS4_CLKDIV_STATCPU)&  0x11111111)
+	while (__raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKDIV_STATCPU)
+	&  0x11111111)
  		cpu_relax();

  	/* Change Divider - CPU1 */
  	tmp = apll_freq_4x12[div_index].clk_div_cpu1;

-	__raw_writel(tmp, EXYNOS4_CLKDIV_CPU1);
+	__raw_writel(tmp, cpufreq->cmu_regs + EXYNOS4_CLKDIV_CPU1);

  	do {
  		cpu_relax();
-		tmp = __raw_readl(EXYNOS4_CLKDIV_STATCPU1);
+		tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKDIV_STATCPU1);
  	} while (tmp != 0x0);
  }

@@ -130,7 +134,7 @@ static void exynos4x12_set_apll(unsigned int index)

  	do {
  		cpu_relax();
-		tmp = (__raw_readl(EXYNOS4_CLKMUX_STATCPU)
+		tmp = (__raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKMUX_STATCPU)
  			>>  EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT);
  		tmp&= 0x7;
  	} while (tmp != 0x2);
@@ -142,7 +146,7 @@ static void exynos4x12_set_apll(unsigned int index)

  	do {
  		cpu_relax();
-		tmp = __raw_readl(EXYNOS4_CLKMUX_STATCPU);
+		tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS4_CLKMUX_STATCPU);
  		tmp&= EXYNOS4_CLKMUX_STATCPU_MUXCORE_MASK;
  	} while (tmp != (0x1<<  EXYNOS4_CLKSRC_CPU_MUXCORE_SHIFT));
  }
@@ -161,8 +165,30 @@ static void exynos4x12_set_frequency(unsigned int old_index,

  int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info)
  {
+	struct device_node *np;
  	unsigned long rate;

+	/*
+	 * HACK: This is a temporary workaround to get access to clock
+	 * controller registers directly and remove static mappings and
+	 * dependencies on platform headers. It is necessary to enable
+	 * Exynos multi-platform support and will be removed together with
+	 * this whole driver as soon as Exynos gets migrated to use
+	 * cpufreq-cpu0 driver.
+	 */
+	np = of_find_compatible_node(NULL, NULL, "samsung,exynos4412-clock");
+	if (!np) {
+		pr_err("%s: failed to find clock controller DT node\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	info->cmu_regs = of_iomap(np, 0);
+	if (!info->cmu_regs) {
+		pr_err("%s: failed to map CMU registers\n", __func__);
+		return -EFAULT;
+	}
+
  	cpu_clk = clk_get(NULL, "armclk");
  	if (IS_ERR(cpu_clk))
  		return PTR_ERR(cpu_clk);
@@ -194,6 +220,8 @@ int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info)
  	info->freq_table = exynos4x12_freq_table;
  	info->set_freq = exynos4x12_set_frequency;

+	cpufreq = info;
+
  	return 0;

  err_mout_apll:
diff --git a/drivers/cpufreq/exynos5250-cpufreq.c b/drivers/cpufreq/exynos5250-cpufreq.c
index 363a0b3..c91ce69 100644
--- a/drivers/cpufreq/exynos5250-cpufreq.c
+++ b/drivers/cpufreq/exynos5250-cpufreq.c
@@ -16,8 +16,8 @@
  #include<linux/io.h>
  #include<linux/slab.h>
  #include<linux/cpufreq.h>
-
-#include<mach/map.h>
+#include<linux/of.h>
+#include<linux/of_address.h>

  #include "exynos-cpufreq.h"

@@ -25,6 +25,7 @@ static struct clk *cpu_clk;
  static struct clk *moutcore;
  static struct clk *mout_mpll;
  static struct clk *mout_apll;
+static struct exynos_dvfs_info *cpufreq;

  static unsigned int exynos5250_volt_table[] = {
  	1300000, 1250000, 1225000, 1200000, 1150000,
@@ -87,17 +88,18 @@ static void set_clkdiv(unsigned int div_index)

  	tmp = apll_freq_5250[div_index].clk_div_cpu0;

-	__raw_writel(tmp, EXYNOS5_CLKDIV_CPU0);
+	__raw_writel(tmp, cpufreq->cmu_regs + EXYNOS5_CLKDIV_CPU0);

-	while (__raw_readl(EXYNOS5_CLKDIV_STATCPU0)&  0x11111111)
+	while (__raw_readl(cpufreq->cmu_regs + EXYNOS5_CLKDIV_STATCPU0)
+	&  0x11111111)
  		cpu_relax();

  	/* Change Divider - CPU1 */
  	tmp = apll_freq_5250[div_index].clk_div_cpu1;

-	__raw_writel(tmp, EXYNOS5_CLKDIV_CPU1);
+	__raw_writel(tmp, cpufreq->cmu_regs + EXYNOS5_CLKDIV_CPU1);

-	while (__raw_readl(EXYNOS5_CLKDIV_STATCPU1)&  0x11)
+	while (__raw_readl(cpufreq->cmu_regs + EXYNOS5_CLKDIV_STATCPU1)&  0x11)
  		cpu_relax();
  }

@@ -111,7 +113,8 @@ static void set_apll(unsigned int index)

  	do {
  		cpu_relax();
-		tmp = (__raw_readl(EXYNOS5_CLKMUX_STATCPU)>>  16);
+		tmp = (__raw_readl(cpufreq->cmu_regs + EXYNOS5_CLKMUX_STATCPU)
+			>>  16);
  		tmp&= 0x7;
  	} while (tmp != 0x2);

@@ -122,7 +125,7 @@ static void set_apll(unsigned int index)

  	do {
  		cpu_relax();
-		tmp = __raw_readl(EXYNOS5_CLKMUX_STATCPU);
+		tmp = __raw_readl(cpufreq->cmu_regs + EXYNOS5_CLKMUX_STATCPU);
  		tmp&= (0x7<<  16);
  	} while (tmp != (0x1<<  16));
  }
@@ -141,8 +144,30 @@ static void exynos5250_set_frequency(unsigned int old_index,

  int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
  {
+	struct device_node *np;
  	unsigned long rate;

+	/*
+	 * HACK: This is a temporary workaround to get access to clock
+	 * controller registers directly and remove static mappings and
+	 * dependencies on platform headers. It is necessary to enable
+	 * Exynos multi-platform support and will be removed together with
+	 * this whole driver as soon as Exynos gets migrated to use
+	 * cpufreq-cpu0 driver.
+	 */
+	np = of_find_compatible_node(NULL, NULL, "samsung,exynos5250-clock");
+	if (!np) {
+		pr_err("%s: failed to find clock controller DT node\n",
+			__func__);
+		return -ENODEV;
+	}
+
+	info->cmu_regs = of_iomap(np, 0);
+	if (!info->cmu_regs) {
+		pr_err("%s: failed to map CMU registers\n", __func__);
+		return -EFAULT;
+	}
+
  	cpu_clk = clk_get(NULL, "armclk");
  	if (IS_ERR(cpu_clk))
  		return PTR_ERR(cpu_clk);
@@ -169,6 +194,8 @@ int exynos5250_cpufreq_init(struct exynos_dvfs_info *info)
  	info->freq_table = exynos5250_freq_table;
  	info->set_freq = exynos5250_set_frequency;

+	cpufreq = info;
+
  	return 0;

  err_mout_apll:

--
Thanks.

Best regards,
Kgene.
--
Kukjin Kim <kgene.kim@xxxxxxxxxxx>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.
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