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,