ARM: S3C64XX: Merge s3c6400-clock.c and clock.c into mach-s3c64xx

Merge plat-s3c64xx/s3c6400-clock.c mach-s3c64xx/clock.c placing all the
clock code into one place.

Note, no effort is made in this patch to squash the init functions
together.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>

2 files changed, 507 insertions, 2 deletions

diff --git a/arch/arm/mach-s3c64xx/Kconfig b/arch/arm/mach-s3c64xx/Kconfig
index 33d82b1c9eff..8c2c89c24fce 100644
--- a/arch/arm/mach-s3c64xx/Kconfig
+++ b/arch/arm/mach-s3c64xx/Kconfig
@@ -7,13 +7,11 @@
 
 config CPU_S3C6400
 	bool
-	select CPU_S3C6400_CLOCK
 	help
 	  Enable S3C6400 CPU support
 
 config CPU_S3C6410
 	bool
-	select CPU_S3C6400_CLOCK
 	help
 	  Enable S3C6410 CPU support
 
diff --git a/arch/arm/mach-s3c64xx/clock.c b/arch/arm/mach-s3c64xx/clock.c
index 229bb3bcc54f..9b587e267422 100644
--- a/arch/arm/mach-s3c64xx/clock.c
+++ b/arch/arm/mach-s3c64xx/clock.c
@@ -16,6 +16,8 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/ioport.h>
+#include <linux/clk.h>
+#include <linux/err.h>
 #include <linux/io.h>
 
 #include <mach/hardware.h>
@@ -27,7 +29,25 @@
 
 #include <plat/cpu.h>
 #include <plat/devs.h>
+#include <plat/cpu-freq.h>
 #include <plat/clock.h>
+#include <plat/clock-clksrc.h>
+
+/* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
+ * ext_xtal_mux for want of an actual name from the manual.
+*/
+
+static struct clk clk_ext_xtal_mux = {
+	.name		= "ext_xtal",
+	.id		= -1,
+};
+
+#define clk_fin_apll clk_ext_xtal_mux
+#define clk_fin_mpll clk_ext_xtal_mux
+#define clk_fin_epll clk_ext_xtal_mux
+
+#define clk_fout_mpll	clk_mpll
+#define clk_fout_epll	clk_epll
 
 struct clk clk_h2 = {
 	.name		= "hclk2",
@@ -273,6 +293,493 @@ static struct clk init_clocks[] = {
 	}
 };
 
+
+static struct clk clk_fout_apll = {
+	.name		= "fout_apll",
+	.id		= -1,
+};
+
+static struct clk *clk_src_apll_list[] = {
+	[0] = &clk_fin_apll,
+	[1] = &clk_fout_apll,
+};
+
+static struct clksrc_sources clk_src_apll = {
+	.sources	= clk_src_apll_list,
+	.nr_sources	= ARRAY_SIZE(clk_src_apll_list),
+};
+
+static struct clksrc_clk clk_mout_apll = {
+	.clk	= {
+		.name		= "mout_apll",
+		.id		= -1,
+	},
+	.reg_src	= { .reg = S3C_CLK_SRC, .shift = 0, .size = 1  },
+	.sources	= &clk_src_apll,
+};
+
+static struct clk *clk_src_epll_list[] = {
+	[0] = &clk_fin_epll,
+	[1] = &clk_fout_epll,
+};
+
+static struct clksrc_sources clk_src_epll = {
+	.sources	= clk_src_epll_list,
+	.nr_sources	= ARRAY_SIZE(clk_src_epll_list),
+};
+
+static struct clksrc_clk clk_mout_epll = {
+	.clk	= {
+		.name		= "mout_epll",
+		.id		= -1,
+	},
+	.reg_src	= { .reg = S3C_CLK_SRC, .shift = 2, .size = 1  },
+	.sources	= &clk_src_epll,
+};
+
+static struct clk *clk_src_mpll_list[] = {
+	[0] = &clk_fin_mpll,
+	[1] = &clk_fout_mpll,
+};
+
+static struct clksrc_sources clk_src_mpll = {
+	.sources	= clk_src_mpll_list,
+	.nr_sources	= ARRAY_SIZE(clk_src_mpll_list),
+};
+
+static struct clksrc_clk clk_mout_mpll = {
+	.clk = {
+		.name		= "mout_mpll",
+		.id		= -1,
+	},
+	.reg_src	= { .reg = S3C_CLK_SRC, .shift = 1, .size = 1  },
+	.sources	= &clk_src_mpll,
+};
+
+static unsigned int armclk_mask;
+
+static unsigned long s3c64xx_clk_arm_get_rate(struct clk *clk)
+{
+	unsigned long rate = clk_get_rate(clk->parent);
+	u32 clkdiv;
+
+	/* divisor mask starts at bit0, so no need to shift */
+	clkdiv = __raw_readl(S3C_CLK_DIV0) & armclk_mask;
+
+	return rate / (clkdiv + 1);
+}
+
+static unsigned long s3c64xx_clk_arm_round_rate(struct clk *clk,
+						unsigned long rate)
+{
+	unsigned long parent = clk_get_rate(clk->parent);
+	u32 div;
+
+	if (parent < rate)
+		return parent;
+
+	div = (parent / rate) - 1;
+	if (div > armclk_mask)
+		div = armclk_mask;
+
+	return parent / (div + 1);
+}
+
+static int s3c64xx_clk_arm_set_rate(struct clk *clk, unsigned long rate)
+{
+	unsigned long parent = clk_get_rate(clk->parent);
+	u32 div;
+	u32 val;
+
+	if (rate < parent / (armclk_mask + 1))
+		return -EINVAL;
+
+	rate = clk_round_rate(clk, rate);
+	div = clk_get_rate(clk->parent) / rate;
+
+	val = __raw_readl(S3C_CLK_DIV0);
+	val &= ~armclk_mask;
+	val |= (div - 1);
+	__raw_writel(val, S3C_CLK_DIV0);
+
+	return 0;
+
+}
+
+static struct clk clk_arm = {
+	.name		= "armclk",
+	.id		= -1,
+	.parent		= &clk_mout_apll.clk,
+	.ops		= &(struct clk_ops) {
+		.get_rate	= s3c64xx_clk_arm_get_rate,
+		.set_rate	= s3c64xx_clk_arm_set_rate,
+		.round_rate	= s3c64xx_clk_arm_round_rate,
+	},
+};
+
+static unsigned long s3c64xx_clk_doutmpll_get_rate(struct clk *clk)
+{
+	unsigned long rate = clk_get_rate(clk->parent);
+
+	printk(KERN_DEBUG "%s: parent is %ld\n", __func__, rate);
+
+	if (__raw_readl(S3C_CLK_DIV0) & S3C6400_CLKDIV0_MPLL_MASK)
+		rate /= 2;
+
+	return rate;
+}
+
+static struct clk_ops clk_dout_ops = {
+	.get_rate	= s3c64xx_clk_doutmpll_get_rate,
+};
+
+static struct clk clk_dout_mpll = {
+	.name		= "dout_mpll",
+	.id		= -1,
+	.parent		= &clk_mout_mpll.clk,
+	.ops		= &clk_dout_ops,
+};
+
+static struct clk *clkset_spi_mmc_list[] = {
+	&clk_mout_epll.clk,
+	&clk_dout_mpll,
+	&clk_fin_epll,
+	&clk_27m,
+};
+
+static struct clksrc_sources clkset_spi_mmc = {
+	.sources	= clkset_spi_mmc_list,
+	.nr_sources	= ARRAY_SIZE(clkset_spi_mmc_list),
+};
+
+static struct clk *clkset_irda_list[] = {
+	&clk_mout_epll.clk,
+	&clk_dout_mpll,
+	NULL,
+	&clk_27m,
+};
+
+static struct clksrc_sources clkset_irda = {
+	.sources	= clkset_irda_list,
+	.nr_sources	= ARRAY_SIZE(clkset_irda_list),
+};
+
+static struct clk *clkset_uart_list[] = {
+	&clk_mout_epll.clk,
+	&clk_dout_mpll,
+	NULL,
+	NULL
+};
+
+static struct clksrc_sources clkset_uart = {
+	.sources	= clkset_uart_list,
+	.nr_sources	= ARRAY_SIZE(clkset_uart_list),
+};
+
+static struct clk *clkset_uhost_list[] = {
+	&clk_48m,
+	&clk_mout_epll.clk,
+	&clk_dout_mpll,
+	&clk_fin_epll,
+};
+
+static struct clksrc_sources clkset_uhost = {
+	.sources	= clkset_uhost_list,
+	.nr_sources	= ARRAY_SIZE(clkset_uhost_list),
+};
+
+/* The peripheral clocks are all controlled via clocksource followed
+ * by an optional divider and gate stage. We currently roll this into
+ * one clock which hides the intermediate clock from the mux.
+ *
+ * Note, the JPEG clock can only be an even divider...
+ *
+ * The scaler and LCD clocks depend on the S3C64XX version, and also
+ * have a common parent divisor so are not included here.
+ */
+
+/* clocks that feed other parts of the clock source tree */
+
+static struct clk clk_iis_cd0 = {
+	.name		= "iis_cdclk0",
+	.id		= -1,
+};
+
+static struct clk clk_iis_cd1 = {
+	.name		= "iis_cdclk1",
+	.id		= -1,
+};
+
+static struct clk clk_pcm_cd = {
+	.name		= "pcm_cdclk",
+	.id		= -1,
+};
+
+static struct clk *clkset_audio0_list[] = {
+	[0] = &clk_mout_epll.clk,
+	[1] = &clk_dout_mpll,
+	[2] = &clk_fin_epll,
+	[3] = &clk_iis_cd0,
+	[4] = &clk_pcm_cd,
+};
+
+static struct clksrc_sources clkset_audio0 = {
+	.sources	= clkset_audio0_list,
+	.nr_sources	= ARRAY_SIZE(clkset_audio0_list),
+};
+
+static struct clk *clkset_audio1_list[] = {
+	[0] = &clk_mout_epll.clk,
+	[1] = &clk_dout_mpll,
+	[2] = &clk_fin_epll,
+	[3] = &clk_iis_cd1,
+	[4] = &clk_pcm_cd,
+};
+
+static struct clksrc_sources clkset_audio1 = {
+	.sources	= clkset_audio1_list,
+	.nr_sources	= ARRAY_SIZE(clkset_audio1_list),
+};
+
+static struct clk *clkset_camif_list[] = {
+	&clk_h2,
+};
+
+static struct clksrc_sources clkset_camif = {
+	.sources	= clkset_camif_list,
+	.nr_sources	= ARRAY_SIZE(clkset_camif_list),
+};
+
+static struct clksrc_clk clksrcs[] = {
+	{
+		.clk	= {
+			.name		= "mmc_bus",
+			.id		= 0,
+			.ctrlbit        = S3C_CLKCON_SCLK_MMC0,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 18, .size = 2  },
+		.reg_div	= { .reg = S3C_CLK_DIV1, .shift = 0, .size = 4  },
+		.sources	= &clkset_spi_mmc,
+	}, {
+		.clk	= {
+			.name		= "mmc_bus",
+			.id		= 1,
+			.ctrlbit        = S3C_CLKCON_SCLK_MMC1,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 20, .size = 2  },
+		.reg_div	= { .reg = S3C_CLK_DIV1, .shift = 4, .size = 4  },
+		.sources	= &clkset_spi_mmc,
+	}, {
+		.clk	= {
+			.name		= "mmc_bus",
+			.id		= 2,
+			.ctrlbit        = S3C_CLKCON_SCLK_MMC2,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 22, .size = 2  },
+		.reg_div 	= { .reg = S3C_CLK_DIV1, .shift = 8, .size = 4  },
+		.sources	= &clkset_spi_mmc,
+	}, {
+		.clk	= {
+			.name		= "usb-bus-host",
+			.id		= -1,
+			.ctrlbit        = S3C_CLKCON_SCLK_UHOST,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src 	= { .reg = S3C_CLK_SRC, .shift = 5, .size = 2  },
+		.reg_div	= { .reg = S3C_CLK_DIV1, .shift = 20, .size = 4  },
+		.sources	= &clkset_uhost,
+	}, {
+		.clk	= {
+			.name		= "uclk1",
+			.id		= -1,
+			.ctrlbit        = S3C_CLKCON_SCLK_UART,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 13, .size = 1  },
+		.reg_div	= { .reg = S3C_CLK_DIV2, .shift = 16, .size = 4  },
+		.sources	= &clkset_uart,
+	}, {
+/* Where does UCLK0 come from? */
+		.clk	= {
+			.name		= "spi-bus",
+			.id		= 0,
+			.ctrlbit        = S3C_CLKCON_SCLK_SPI0,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 14, .size = 2  },
+		.reg_div	= { .reg = S3C_CLK_DIV2, .shift = 0, .size = 4  },
+		.sources	= &clkset_spi_mmc,
+	}, {
+		.clk	= {
+			.name		= "spi-bus",
+			.id		= 1,
+			.ctrlbit        = S3C_CLKCON_SCLK_SPI1,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 16, .size = 2  },
+		.reg_div	= { .reg = S3C_CLK_DIV2, .shift = 4, .size = 4  },
+		.sources	= &clkset_spi_mmc,
+	}, {
+		.clk	= {
+			.name		= "audio-bus",
+			.id		= 0,
+			.ctrlbit        = S3C_CLKCON_SCLK_AUDIO0,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 7, .size = 3  },
+		.reg_div	= { .reg = S3C_CLK_DIV2, .shift = 8, .size = 4  },
+		.sources	= &clkset_audio0,
+	}, {
+		.clk	= {
+			.name		= "audio-bus",
+			.id		= 1,
+			.ctrlbit        = S3C_CLKCON_SCLK_AUDIO1,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 10, .size = 3  },
+		.reg_div	= { .reg = S3C_CLK_DIV2, .shift = 12, .size = 4  },
+		.sources	= &clkset_audio1,
+	}, {
+		.clk	= {
+			.name		= "irda-bus",
+			.id		= 0,
+			.ctrlbit        = S3C_CLKCON_SCLK_IRDA,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_src	= { .reg = S3C_CLK_SRC, .shift = 24, .size = 2  },
+		.reg_div	= { .reg = S3C_CLK_DIV2, .shift = 20, .size = 4  },
+		.sources	= &clkset_irda,
+	}, {
+		.clk	= {
+			.name		= "camera",
+			.id		= -1,
+			.ctrlbit        = S3C_CLKCON_SCLK_CAM,
+			.enable		= s3c64xx_sclk_ctrl,
+		},
+		.reg_div	= { .reg = S3C_CLK_DIV0, .shift = 20, .size = 4  },
+		.reg_src	= { .reg = NULL, .shift = 0, .size = 0  },
+		.sources	= &clkset_camif,
+	},
+};
+
+/* Clock initialisation code */
+
+static struct clksrc_clk *init_parents[] = {
+	&clk_mout_apll,
+	&clk_mout_epll,
+	&clk_mout_mpll,
+};
+
+#define GET_DIV(clk, field) ((((clk) & field##_MASK) >> field##_SHIFT) + 1)
+
+void __init_or_cpufreq s3c6400_setup_clocks(void)
+{
+	struct clk *xtal_clk;
+	unsigned long xtal;
+	unsigned long fclk;
+	unsigned long hclk;
+	unsigned long hclk2;
+	unsigned long pclk;
+	unsigned long epll;
+	unsigned long apll;
+	unsigned long mpll;
+	unsigned int ptr;
+	u32 clkdiv0;
+
+	printk(KERN_DEBUG "%s: registering clocks\n", __func__);
+
+	clkdiv0 = __raw_readl(S3C_CLK_DIV0);
+	printk(KERN_DEBUG "%s: clkdiv0 = %08x\n", __func__, clkdiv0);
+
+	xtal_clk = clk_get(NULL, "xtal");
+	BUG_ON(IS_ERR(xtal_clk));
+
+	xtal = clk_get_rate(xtal_clk);
+	clk_put(xtal_clk);
+
+	printk(KERN_DEBUG "%s: xtal is %ld\n", __func__, xtal);
+
+	/* For now assume the mux always selects the crystal */
+	clk_ext_xtal_mux.parent = xtal_clk;
+
+	epll = s3c6400_get_epll(xtal);
+	mpll = s3c6400_get_pll(xtal, __raw_readl(S3C_MPLL_CON));
+	apll = s3c6400_get_pll(xtal, __raw_readl(S3C_APLL_CON));
+
+	fclk = mpll;
+
+	printk(KERN_INFO "S3C64XX: PLL settings, A=%ld, M=%ld, E=%ld\n",
+	       apll, mpll, epll);
+
+	hclk2 = mpll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2);
+	hclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK);
+	pclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_PCLK);
+
+	printk(KERN_INFO "S3C64XX: HCLK2=%ld, HCLK=%ld, PCLK=%ld\n",
+	       hclk2, hclk, pclk);
+
+	clk_fout_mpll.rate = mpll;
+	clk_fout_epll.rate = epll;
+	clk_fout_apll.rate = apll;
+
+	clk_h2.rate = hclk2;
+	clk_h.rate = hclk;
+	clk_p.rate = pclk;
+	clk_f.rate = fclk;
+
+	for (ptr = 0; ptr < ARRAY_SIZE(init_parents); ptr++)
+		s3c_set_clksrc(init_parents[ptr], true);
+
+	for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
+		s3c_set_clksrc(&clksrcs[ptr], true);
+}
+
+static struct clk *clks1[] __initdata = {
+	&clk_ext_xtal_mux,
+	&clk_iis_cd0,
+	&clk_iis_cd1,
+	&clk_pcm_cd,
+	&clk_mout_epll.clk,
+	&clk_mout_mpll.clk,
+	&clk_dout_mpll,
+	&clk_arm,
+};
+
+/**
+ * s3c6400_register_clocks - register clocks for s3c6400 and above
+ * @armclk_divlimit: Divisor mask for ARMCLK
+ *
+ * Register the clocks for the S3C6400 and above SoC range, such
+ * as ARMCLK and the clocks which have divider chains attached.
+ *
+ * This call does not setup the clocks, which is left to the
+ * s3c6400_setup_clocks() call which may be needed by the cpufreq
+ * or resume code to re-set the clocks if the bootloader has changed
+ * them.
+ */
+void __init s3c6400_register_clocks(unsigned armclk_divlimit)
+{
+	struct clk *clkp;
+	int ret;
+	int ptr;
+
+	armclk_mask = armclk_divlimit;
+
+	for (ptr = 0; ptr < ARRAY_SIZE(clks1); ptr++) {
+		clkp = clks1[ptr];
+		ret = s3c24xx_register_clock(clkp);
+		if (ret < 0) {
+			printk(KERN_ERR "Failed to register clock %s (%d)\n",
+			       clkp->name, ret);
+		}
+	}
+
+	s3c_register_clksrc(clksrcs, ARRAY_SIZE(clksrcs));
+}
+
 static struct clk *clks[] __initdata = {
 	&clk_ext,
 	&clk_epll,