Revert "arm: pxa: Transition pxa27x to clk framework"

This reverts commit 9ff25d7b58d8a4374886843ed3ed21f1ef17bf16.

Originally reported on the kernel-build-reports mailing list[0]. The
problem is caused by kernel configs that select both pxa25x and pxa27x
such as cm_x2xx_defconfig and palmz72_defconfig. The short term solution
is to revert the patch introducing the failure. Longer term, all the PXA
chips will be converted to the common clock framework allowing support
for various PXA chips to build into a single image.

Reverting just this one patch does introduce some dead code into the
kernel, but that is offset by making it easier to convert the remaining
PXA platforms to the clock framework.

[0] http://lists.linaro.org/pipermail/kernel-build-reports/2014-October/005576.html

Signed-off-by: Mike Turquette <mturquette@linaro.org>

2 files changed, 179 insertions, 16 deletions

diff --git a/arch/arm/mach-pxa/Makefile b/arch/arm/mach-pxa/Makefile
index f09259a7191..2fe1824c6dc 100644
--- a/arch/arm/mach-pxa/Makefile
+++ b/arch/arm/mach-pxa/Makefile
@@ -3,15 +3,16 @@
 #
 
 # Common support (must be linked before board specific support)
-obj-y				+= devices.o generic.o irq.o reset.o
+obj-y				+= clock.o devices.o generic.o irq.o \
+				   reset.o
 obj-$(CONFIG_PM)		+= pm.o sleep.o standby.o
 
 # Generic drivers that other drivers may depend upon
 
 # SoC-specific code
-obj-$(CONFIG_PXA25x)		+= mfp-pxa2xx.o clock.o clock-pxa2xx.o pxa2xx.o pxa25x.o
-obj-$(CONFIG_PXA27x)		+= mfp-pxa2xx.o pxa2xx.o pxa27x.o
-obj-$(CONFIG_PXA3xx)		+= mfp-pxa3xx.o clock.o clock-pxa3xx.o pxa3xx.o smemc.o pxa3xx-ulpi.o
+obj-$(CONFIG_PXA25x)		+= mfp-pxa2xx.o clock-pxa2xx.o pxa2xx.o pxa25x.o
+obj-$(CONFIG_PXA27x)		+= mfp-pxa2xx.o clock-pxa2xx.o pxa2xx.o pxa27x.o
+obj-$(CONFIG_PXA3xx)		+= mfp-pxa3xx.o clock-pxa3xx.o pxa3xx.o smemc.o pxa3xx-ulpi.o
 obj-$(CONFIG_CPU_PXA300)	+= pxa300.o
 obj-$(CONFIG_CPU_PXA320)	+= pxa320.o
 obj-$(CONFIG_CPU_PXA930)	+= pxa930.o
diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index 668087f4e49..b040d7d1488 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -37,8 +37,7 @@
 
 #include "generic.h"
 #include "devices.h"
-#include <linux/clk-provider.h>
-#include <linux/clkdev.h>
+#include "clock.h"
 
 void pxa27x_clear_otgph(void)
 {
@@ -74,6 +73,174 @@ void pxa27x_configure_ac97reset(int reset_gpio, bool to_gpio)
 }
 EXPORT_SYMBOL_GPL(pxa27x_configure_ac97reset);
 
+/* Crystal clock: 13MHz */
+#define BASE_CLK	13000000
+
+/*
+ * Get the clock frequency as reflected by CCSR and the turbo flag.
+ * We assume these values have been applied via a fcs.
+ * If info is not 0 we also display the current settings.
+ */
+unsigned int pxa27x_get_clk_frequency_khz(int info)
+{
+	unsigned long ccsr, clkcfg;
+	unsigned int l, L, m, M, n2, N, S;
+       	int cccr_a, t, ht, b;
+
+	ccsr = CCSR;
+	cccr_a = CCCR & (1 << 25);
+
+	/* Read clkcfg register: it has turbo, b, half-turbo (and f) */
+	asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
+	t  = clkcfg & (1 << 0);
+	ht = clkcfg & (1 << 2);
+	b  = clkcfg & (1 << 3);
+
+	l  = ccsr & 0x1f;
+	n2 = (ccsr>>7) & 0xf;
+	m  = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
+
+	L  = l * BASE_CLK;
+	N  = (L * n2) / 2;
+	M  = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
+	S  = (b) ? L : (L/2);
+
+	if (info) {
+		printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
+			L / 1000000, (L % 1000000) / 10000, l );
+		printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
+			N / 1000000, (N % 1000000)/10000, n2 / 2, (n2 % 2)*5,
+			(t) ? "" : "in" );
+		printk( KERN_INFO "Memory clock: %d.%02dMHz (/%d)\n",
+			M / 1000000, (M % 1000000) / 10000, m );
+		printk( KERN_INFO "System bus clock: %d.%02dMHz \n",
+			S / 1000000, (S % 1000000) / 10000 );
+	}
+
+	return (t) ? (N/1000) : (L/1000);
+}
+
+/*
+ * Return the current mem clock frequency as reflected by CCCR[A], B, and L
+ */
+static unsigned long clk_pxa27x_mem_getrate(struct clk *clk)
+{
+	unsigned long ccsr, clkcfg;
+	unsigned int l, L, m, M;
+       	int cccr_a, b;
+
+	ccsr = CCSR;
+	cccr_a = CCCR & (1 << 25);
+
+	/* Read clkcfg register: it has turbo, b, half-turbo (and f) */
+	asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg) );
+	b = clkcfg & (1 << 3);
+
+	l = ccsr & 0x1f;
+	m = (l <= 10) ? 1 : (l <= 20) ? 2 : 4;
+
+	L = l * BASE_CLK;
+	M = (!cccr_a) ? (L/m) : ((b) ? L : (L/2));
+
+	return M;
+}
+
+static const struct clkops clk_pxa27x_mem_ops = {
+	.enable		= clk_dummy_enable,
+	.disable	= clk_dummy_disable,
+	.getrate	= clk_pxa27x_mem_getrate,
+};
+
+/*
+ * Return the current LCD clock frequency in units of 10kHz as
+ */
+static unsigned int pxa27x_get_lcdclk_frequency_10khz(void)
+{
+	unsigned long ccsr;
+	unsigned int l, L, k, K;
+
+	ccsr = CCSR;
+
+	l = ccsr & 0x1f;
+	k = (l <= 7) ? 1 : (l <= 16) ? 2 : 4;
+
+	L = l * BASE_CLK;
+	K = L / k;
+
+	return (K / 10000);
+}
+
+static unsigned long clk_pxa27x_lcd_getrate(struct clk *clk)
+{
+	return pxa27x_get_lcdclk_frequency_10khz() * 10000;
+}
+
+static const struct clkops clk_pxa27x_lcd_ops = {
+	.enable		= clk_pxa2xx_cken_enable,
+	.disable	= clk_pxa2xx_cken_disable,
+	.getrate	= clk_pxa27x_lcd_getrate,
+};
+
+static DEFINE_PXA2_CKEN(pxa27x_ffuart, FFUART, 14857000, 1);
+static DEFINE_PXA2_CKEN(pxa27x_btuart, BTUART, 14857000, 1);
+static DEFINE_PXA2_CKEN(pxa27x_stuart, STUART, 14857000, 1);
+static DEFINE_PXA2_CKEN(pxa27x_i2s, I2S, 14682000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_i2c, I2C, 32842000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_usb, USB, 48000000, 5);
+static DEFINE_PXA2_CKEN(pxa27x_mmc, MMC, 19500000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_ficp, FICP, 48000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_usbhost, USBHOST, 48000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_pwri2c, PWRI2C, 13000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_keypad, KEYPAD, 32768, 0);
+static DEFINE_PXA2_CKEN(pxa27x_ssp1, SSP1, 13000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_ssp2, SSP2, 13000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_ssp3, SSP3, 13000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_pwm0, PWM0, 13000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_pwm1, PWM1, 13000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_ac97, AC97, 24576000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_ac97conf, AC97CONF, 24576000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_msl, MSL, 48000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_usim, USIM, 48000000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_memstk, MEMSTK, 19500000, 0);
+static DEFINE_PXA2_CKEN(pxa27x_im, IM, 0, 0);
+static DEFINE_PXA2_CKEN(pxa27x_memc, MEMC, 0, 0);
+
+static DEFINE_CK(pxa27x_lcd, LCD, &clk_pxa27x_lcd_ops);
+static DEFINE_CK(pxa27x_camera, CAMERA, &clk_pxa27x_lcd_ops);
+static DEFINE_CLK(pxa27x_mem, &clk_pxa27x_mem_ops, 0, 0);
+
+static struct clk_lookup pxa27x_clkregs[] = {
+	INIT_CLKREG(&clk_pxa27x_lcd, "pxa2xx-fb", NULL),
+	INIT_CLKREG(&clk_pxa27x_camera, "pxa27x-camera.0", NULL),
+	INIT_CLKREG(&clk_pxa27x_ffuart, "pxa2xx-uart.0", NULL),
+	INIT_CLKREG(&clk_pxa27x_btuart, "pxa2xx-uart.1", NULL),
+	INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-uart.2", NULL),
+	INIT_CLKREG(&clk_pxa27x_i2s, "pxa2xx-i2s", NULL),
+	INIT_CLKREG(&clk_pxa27x_i2c, "pxa2xx-i2c.0", NULL),
+	INIT_CLKREG(&clk_pxa27x_usb, "pxa27x-udc", NULL),
+	INIT_CLKREG(&clk_pxa27x_mmc, "pxa2xx-mci.0", NULL),
+	INIT_CLKREG(&clk_pxa27x_stuart, "pxa2xx-ir", "UARTCLK"),
+	INIT_CLKREG(&clk_pxa27x_ficp, "pxa2xx-ir", "FICPCLK"),
+	INIT_CLKREG(&clk_pxa27x_usbhost, "pxa27x-ohci", NULL),
+	INIT_CLKREG(&clk_pxa27x_pwri2c, "pxa2xx-i2c.1", NULL),
+	INIT_CLKREG(&clk_pxa27x_keypad, "pxa27x-keypad", NULL),
+	INIT_CLKREG(&clk_pxa27x_ssp1, "pxa27x-ssp.0", NULL),
+	INIT_CLKREG(&clk_pxa27x_ssp2, "pxa27x-ssp.1", NULL),
+	INIT_CLKREG(&clk_pxa27x_ssp3, "pxa27x-ssp.2", NULL),
+	INIT_CLKREG(&clk_pxa27x_pwm0, "pxa27x-pwm.0", NULL),
+	INIT_CLKREG(&clk_pxa27x_pwm1, "pxa27x-pwm.1", NULL),
+	INIT_CLKREG(&clk_pxa27x_ac97, NULL, "AC97CLK"),
+	INIT_CLKREG(&clk_pxa27x_ac97conf, NULL, "AC97CONFCLK"),
+	INIT_CLKREG(&clk_pxa27x_msl, NULL, "MSLCLK"),
+	INIT_CLKREG(&clk_pxa27x_usim, NULL, "USIMCLK"),
+	INIT_CLKREG(&clk_pxa27x_memstk, NULL, "MSTKCLK"),
+	INIT_CLKREG(&clk_pxa27x_im, NULL, "IMCLK"),
+	INIT_CLKREG(&clk_pxa27x_memc, NULL, "MEMCLK"),
+	INIT_CLKREG(&clk_pxa27x_mem, "pxa2xx-pcmcia", NULL),
+	INIT_CLKREG(&clk_dummy, "pxa27x-gpio", NULL),
+	INIT_CLKREG(&clk_dummy, "sa1100-rtc", NULL),
+};
+
 #ifdef CONFIG_PM
 
 #define SAVE(x)		sleep_save[SLEEP_SAVE_##x] = x
@@ -293,6 +460,8 @@ static int __init pxa27x_init(void)
 
 		reset_status = RCSR;
 
+		clkdev_add_table(pxa27x_clkregs, ARRAY_SIZE(pxa27x_clkregs));
+
 		if ((ret = pxa_init_dma(IRQ_DMA, 32)))
 			return ret;
 
@@ -300,17 +469,10 @@ static int __init pxa27x_init(void)
 
 		register_syscore_ops(&pxa_irq_syscore_ops);
 		register_syscore_ops(&pxa2xx_mfp_syscore_ops);
+		register_syscore_ops(&pxa2xx_clock_syscore_ops);
 
-		if (!of_have_populated_dt()) {
-			ret = clk_register_clkdev(NULL, NULL,
-						  "pxa27x-gpio");
-			if (!ret)
-				pxa_register_device(&pxa27x_device_gpio,
-						    &pxa27x_gpio_info);
-			if (!ret)
-				ret = platform_add_devices(devices,
-							   ARRAY_SIZE(devices));
-		}
+		pxa_register_device(&pxa27x_device_gpio, &pxa27x_gpio_info);
+		ret = platform_add_devices(devices, ARRAY_SIZE(devices));
 	}
 
 	return ret;