ARM: Orion: Add clocks using the generic clk infrastructure.

Add tclk as a fixed rate clock for all platforms. In addition, on
kirkwood, add a gated clock for most of the clocks which can be gated.

Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Jamie Lentin <jm@lentin.co.uk>
[mturquette@linaro.org: removed redundant CLKDEV_LOOKUP from Kconfig]
[mturquette@linaro.org: removed redundant clk.h from mach-dove/common.c]
Signed-off-by: Mike Turquette <mturquette@linaro.org>

9 files changed, 115 insertions, 13 deletions

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index cf006d40342c..9be624af131f 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1139,6 +1139,7 @@ config PLAT_ORION
         bool
         select CLKSRC_MMIO
         select GENERIC_IRQ_CHIP
+        select COMMON_CLK
 
 config PLAT_PXA
         bool
diff --git a/arch/arm/mach-dove/common.c b/arch/arm/mach-dove/common.c
index bda7aca04ca0..63fe6e612e98 100644
--- a/arch/arm/mach-dove/common.c
+++ b/arch/arm/mach-dove/common.c
@@ -13,7 +13,7 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/pci.h>
-#include <linux/clk.h>
+#include <linux/clk-provider.h>
 #include <linux/ata_platform.h>
 #include <linux/gpio.h>
 #include <asm/page.h>
@@ -68,6 +68,17 @@ void __init dove_map_io(void)
 }
 
 /*****************************************************************************
+ * CLK tree
+ ****************************************************************************/
+static struct clk *tclk;
+
+static void __init clk_init(void)
+{
+        tclk = clk_register_fixed_rate(NULL, "tclk", NULL, CLK_IS_ROOT,
+                                       get_tclk());
+}
+
+/*****************************************************************************
  * EHCI0
  ****************************************************************************/
 void __init dove_ehci0_init(void)
@@ -272,18 +283,17 @@ void __init dove_sdio1_init(void)
 
 void __init dove_init(void)
 {
-        int tclk;
-
-        tclk = get_tclk();
-
         printk(KERN_INFO "Dove 88AP510 SoC, ");
-        printk(KERN_INFO "TCLK = %dMHz\n", (tclk + 499999) / 1000000);
+        printk(KERN_INFO "TCLK = %dMHz\n", (get_tclk() + 499999) / 1000000);
 
 #ifdef CONFIG_CACHE_TAUROS2
         tauros2_init();
 #endif
         dove_setup_cpu_mbus();
 
+        /* Setup root of clk tree */
+        clk_init();
+
         /* internal devices that every board has */
         dove_rtc_init();
         dove_xor0_init();
diff --git a/arch/arm/mach-kirkwood/board-dt.c b/arch/arm/mach-kirkwood/board-dt.c
index 1c672d9e6656..87856b5a397d 100644
--- a/arch/arm/mach-kirkwood/board-dt.c
+++ b/arch/arm/mach-kirkwood/board-dt.c
@@ -42,6 +42,9 @@ static void __init kirkwood_dt_init(void)
         kirkwood_l2_init();
 #endif
 
+        /* Setup root of clk tree */
+        kirkwood_clk_init();
+
         /* internal devices that every board has */
         kirkwood_wdt_init();
         kirkwood_xor0_init();
diff --git a/arch/arm/mach-kirkwood/common.c b/arch/arm/mach-kirkwood/common.c
index a02cae881f2f..57b8d1ef3093 100644
--- a/arch/arm/mach-kirkwood/common.c
+++ b/arch/arm/mach-kirkwood/common.c
@@ -15,6 +15,8 @@
 #include <linux/ata_platform.h>
 #include <linux/mtd/nand.h>
 #include <linux/dma-mapping.h>
+#include <linux/clk-provider.h>
+#include <linux/spinlock.h>
 #include <net/dsa.h>
 #include <asm/page.h>
 #include <asm/timex.h>
@@ -31,6 +33,7 @@
 #include <plat/common.h>
 #include <plat/time.h>
 #include <plat/addr-map.h>
+#include <plat/mv_xor.h>
 #include "common.h"
 
 /*****************************************************************************
@@ -69,6 +72,41 @@ unsigned int kirkwood_clk_ctrl = CGC_DUNIT | CGC_RESERVED;
 
 
 /*****************************************************************************
+ * CLK tree
+ ****************************************************************************/
+static DEFINE_SPINLOCK(gating_lock);
+static struct clk *tclk;
+
+static struct clk __init *kirkwood_register_gate(const char *name, u8 bit_idx)
+{
+        return clk_register_gate(NULL, name, "tclk", CLK_IGNORE_UNUSED,
+                                 (void __iomem *)CLOCK_GATING_CTRL,
+                                 bit_idx, 0, &gating_lock);
+}
+
+void __init kirkwood_clk_init(void)
+{
+        tclk = clk_register_fixed_rate(NULL, "tclk", NULL,
+                                       CLK_IS_ROOT, kirkwood_tclk);
+
+        kirkwood_register_gate("runit",  CGC_BIT_RUNIT);
+        kirkwood_register_gate("ge0",    CGC_BIT_GE0);
+        kirkwood_register_gate("ge1",    CGC_BIT_GE1);
+        kirkwood_register_gate("sata0",  CGC_BIT_SATA0);
+        kirkwood_register_gate("sata1",  CGC_BIT_SATA1);
+        kirkwood_register_gate("usb0",   CGC_BIT_USB0);
+        kirkwood_register_gate("sdio",   CGC_BIT_SDIO);
+        kirkwood_register_gate("crypto", CGC_BIT_CRYPTO);
+        kirkwood_register_gate("xor0",   CGC_BIT_XOR0);
+        kirkwood_register_gate("xor1",   CGC_BIT_XOR1);
+        kirkwood_register_gate("pex0",   CGC_BIT_PEX0);
+        kirkwood_register_gate("pex1",   CGC_BIT_PEX1);
+        kirkwood_register_gate("audio",  CGC_BIT_AUDIO);
+        kirkwood_register_gate("tdm",    CGC_BIT_TDM);
+        kirkwood_register_gate("tsu",    CGC_BIT_TSU);
+}
+
+/*****************************************************************************
  * EHCI0
  ****************************************************************************/
 void __init kirkwood_ehci_init(void)
@@ -465,6 +503,9 @@ void __init kirkwood_init(void)
         kirkwood_l2_init();
 #endif
 
+        /* Setup root of clk tree */
+        kirkwood_clk_init();
+
         /* internal devices that every board has */
         kirkwood_rtc_init();
         kirkwood_wdt_init();
diff --git a/arch/arm/mach-kirkwood/common.h b/arch/arm/mach-kirkwood/common.h
index fa8e7689c436..0729b11a3e2a 100644
--- a/arch/arm/mach-kirkwood/common.h
+++ b/arch/arm/mach-kirkwood/common.h
@@ -50,6 +50,7 @@ void kirkwood_nand_init(struct mtd_partition *parts, int nr_parts, int delay);
 void kirkwood_nand_init_rnb(struct mtd_partition *parts, int nr_parts, int (*dev_ready)(struct mtd_info *));
 void kirkwood_audio_init(void);
 void kirkwood_restart(char, const char *);
+void kirkwood_clk_init(void);
 
 /* board init functions for boards not fully converted to fdt */
 #ifdef CONFIG_MACH_DREAMPLUG_DT
diff --git a/arch/arm/mach-kirkwood/include/mach/bridge-regs.h b/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
index 957bd7997d7e..3eee37a3b501 100644
--- a/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
+++ b/arch/arm/mach-kirkwood/include/mach/bridge-regs.h
@@ -43,6 +43,22 @@
 #define L2_WRITETHROUGH         0x00000010
 
 #define CLOCK_GATING_CTRL       (BRIDGE_VIRT_BASE | 0x11c)
+#define CGC_BIT_GE0             (0)
+#define CGC_BIT_PEX0            (2)
+#define CGC_BIT_USB0            (3)
+#define CGC_BIT_SDIO            (4)
+#define CGC_BIT_TSU             (5)
+#define CGC_BIT_DUNIT           (6)
+#define CGC_BIT_RUNIT           (7)
+#define CGC_BIT_XOR0            (8)
+#define CGC_BIT_AUDIO           (9)
+#define CGC_BIT_SATA0           (14)
+#define CGC_BIT_SATA1           (15)
+#define CGC_BIT_XOR1            (16)
+#define CGC_BIT_CRYPTO          (17)
+#define CGC_BIT_PEX1            (18)
+#define CGC_BIT_GE1             (19)
+#define CGC_BIT_TDM             (20)
 #define CGC_GE0                 (1 << 0)
 #define CGC_PEX0                (1 << 2)
 #define CGC_USB0                (1 << 3)
diff --git a/arch/arm/mach-mv78xx0/common.c b/arch/arm/mach-mv78xx0/common.c
index a5dcf766a3f9..73733207f5a9 100644
--- a/arch/arm/mach-mv78xx0/common.c
+++ b/arch/arm/mach-mv78xx0/common.c
@@ -13,6 +13,7 @@
 #include <linux/platform_device.h>
 #include <linux/serial_8250.h>
 #include <linux/ata_platform.h>
+#include <linux/clk-provider.h>
 #include <linux/ethtool.h>
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
@@ -103,24 +104,24 @@ static void get_pclk_l2clk(int hclk, int core_index, int *pclk, int *l2clk)
 
 static int get_tclk(void)
 {
-        int tclk;
+        int tclk_freq;
 
         /*
          * TCLK tick rate is configured by DEV_A[2:0] strap pins.
          */
         switch ((readl(SAMPLE_AT_RESET_HIGH) >> 6) & 7) {
         case 1:
-                tclk = 166666667;
+                tclk_freq = 166666667;
                 break;
         case 3:
-                tclk = 200000000;
+                tclk_freq = 200000000;
                 break;
         default:
                 panic("unknown TCLK PLL setting: %.8x\n",
                         readl(SAMPLE_AT_RESET_HIGH));
         }
 
-        return tclk;
+        return tclk_freq;
 }
 
 
@@ -166,6 +167,17 @@ void __init mv78xx0_map_io(void)
 
 
 /*****************************************************************************
+ * CLK tree
+ ****************************************************************************/
+static struct clk *tclk;
+
+static void __init clk_init(void)
+{
+        tclk = clk_register_fixed_rate(NULL, "tclk", NULL, CLK_IS_ROOT,
+                                       get_tclk());
+}
+
+/*****************************************************************************
  * EHCI
  ****************************************************************************/
 void __init mv78xx0_ehci0_init(void)
@@ -378,25 +390,26 @@ void __init mv78xx0_init(void)
         int hclk;
         int pclk;
         int l2clk;
-        int tclk;
 
         core_index = mv78xx0_core_index();
         hclk = get_hclk();
         get_pclk_l2clk(hclk, core_index, &pclk, &l2clk);
-        tclk = get_tclk();
 
         printk(KERN_INFO "%s ", mv78xx0_id());
         printk("core #%d, ", core_index);
         printk("PCLK = %dMHz, ", (pclk + 499999) / 1000000);
         printk("L2 = %dMHz, ", (l2clk + 499999) / 1000000);
         printk("HCLK = %dMHz, ", (hclk + 499999) / 1000000);
-        printk("TCLK = %dMHz\n", (tclk + 499999) / 1000000);
+        printk("TCLK = %dMHz\n", (get_tclk() + 499999) / 1000000);
 
         mv78xx0_setup_cpu_mbus();
 
 #ifdef CONFIG_CACHE_FEROCEON_L2
         feroceon_l2_init(is_l2_writethrough());
 #endif
+
+        /* Setup root of clk tree */
+        clk_init();
 }
 
 void mv78xx0_restart(char mode, const char *cmd)
diff --git a/arch/arm/mach-orion5x/common.c b/arch/arm/mach-orion5x/common.c
index 24481666d2cd..81660522c6b4 100644
--- a/arch/arm/mach-orion5x/common.c
+++ b/arch/arm/mach-orion5x/common.c
@@ -18,6 +18,7 @@
 #include <linux/mv643xx_i2c.h>
 #include <linux/ata_platform.h>
 #include <linux/delay.h>
+#include <linux/clk-provider.h>
 #include <net/dsa.h>
 #include <asm/page.h>
 #include <asm/setup.h>
@@ -70,6 +71,17 @@ void __init orion5x_map_io(void)
 
 
 /*****************************************************************************
+ * CLK tree
+ ****************************************************************************/
+static struct clk *tclk;
+
+static void __init clk_init(void)
+{
+        tclk = clk_register_fixed_rate(NULL, "tclk", NULL, CLK_IS_ROOT,
+                                       orion5x_tclk);
+}
+
+/*****************************************************************************
  * EHCI0
  ****************************************************************************/
 void __init orion5x_ehci0_init(void)
@@ -276,6 +288,9 @@ void __init orion5x_init(void)
          */
         orion5x_setup_cpu_mbus_bridge();
 
+        /* Setup root of clk tree */
+        clk_init();
+
         /*
          * Don't issue "Wait for Interrupt" instruction if we are
          * running on D0 5281 silicon.
diff --git a/arch/arm/plat-orion/common.c b/arch/arm/plat-orion/common.c
index 74daf5ed1432..4fdd2e7e74a1 100644
--- a/arch/arm/plat-orion/common.c
+++ b/arch/arm/plat-orion/common.c
@@ -14,6 +14,8 @@
 #include <linux/dma-mapping.h>
 #include <linux/serial_8250.h>
 #include <linux/ata_platform.h>
+#include <linux/clk.h>
+#include <linux/clkdev.h>
 #include <linux/mv643xx_eth.h>
 #include <linux/mv643xx_i2c.h>
 #include <net/dsa.h>