1 files changed, 214 insertions, 0 deletions

diff --git a/arch/arm/mach-tegra/tegra30_clocks.c b/arch/arm/mach-tegra/tegra30_clocks.c
index 000239d68393..efc000e32e1c 100644
--- a/arch/arm/mach-tegra/tegra30_clocks.c
+++ b/arch/arm/mach-tegra/tegra30_clocks.c
@@ -31,6 +31,8 @@
 
 #include <asm/clkdev.h>
 
+#include <mach/powergate.h>
+
 #include "clock.h"
 #include "fuse.h"
 #include "iomap.h"
@@ -309,6 +311,31 @@
 #define CPU_CLOCK(cpu)  (0x1 << (8 + cpu))
 #define CPU_RESET(cpu)  (0x1111ul << (cpu))
 
+#define CLK_RESET_CCLK_BURST    0x20
+#define CLK_RESET_CCLK_DIVIDER  0x24
+#define CLK_RESET_PLLX_BASE     0xe0
+#define CLK_RESET_PLLX_MISC     0xe4
+
+#define CLK_RESET_SOURCE_CSITE  0x1d4
+
+#define CLK_RESET_CCLK_BURST_POLICY_SHIFT       28
+#define CLK_RESET_CCLK_RUN_POLICY_SHIFT         4
+#define CLK_RESET_CCLK_IDLE_POLICY_SHIFT        0
+#define CLK_RESET_CCLK_IDLE_POLICY              1
+#define CLK_RESET_CCLK_RUN_POLICY               2
+#define CLK_RESET_CCLK_BURST_POLICY_PLLX        8
+
+#ifdef CONFIG_PM_SLEEP
+static struct cpu_clk_suspend_context {
+        u32 pllx_misc;
+        u32 pllx_base;
+
+        u32 cpu_burst;
+        u32 clk_csite_src;
+        u32 cclk_divider;
+} tegra30_cpu_clk_sctx;
+#endif
+
 /**
 * Structure defining the fields for USB UTMI clocks Parameters.
 */
@@ -791,6 +818,112 @@ struct clk_ops tegra30_twd_ops = {
         .recalc_rate = tegra30_twd_clk_recalc_rate,
 };
 
+/* bus clock functions */
+static int tegra30_bus_clk_is_enabled(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg);
+
+        c->state = ((val >> c->reg_shift) & BUS_CLK_DISABLE) ? OFF : ON;
+        return c->state;
+}
+
+static int tegra30_bus_clk_enable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+
+        val = clk_readl(c->reg);
+        val &= ~(BUS_CLK_DISABLE << c->reg_shift);
+        clk_writel(val, c->reg);
+
+        return 0;
+}
+
+static void tegra30_bus_clk_disable(struct clk_hw *hw)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val;
+
+        val = clk_readl(c->reg);
+        val |= BUS_CLK_DISABLE << c->reg_shift;
+        clk_writel(val, c->reg);
+}
+
+static unsigned long tegra30_bus_clk_recalc_rate(struct clk_hw *hw,
+                        unsigned long prate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        u32 val = clk_readl(c->reg);
+        u64 rate = prate;
+
+        c->div = ((val >> c->reg_shift) & BUS_CLK_DIV_MASK) + 1;
+        c->mul = 1;
+
+        if (c->mul != 0 && c->div != 0) {
+                rate *= c->mul;
+                rate += c->div - 1; /* round up */
+                do_div(rate, c->div);
+        }
+        return rate;
+}
+
+static int tegra30_bus_clk_set_rate(struct clk_hw *hw, unsigned long rate,
+                unsigned long parent_rate)
+{
+        struct clk_tegra *c = to_clk_tegra(hw);
+        int ret = -EINVAL;
+        u32 val;
+        int i;
+
+        val = clk_readl(c->reg);
+        for (i = 1; i <= 4; i++) {
+                if (rate == parent_rate / i) {
+                        val &= ~(BUS_CLK_DIV_MASK << c->reg_shift);
+                        val |= (i - 1) << c->reg_shift;
+                        clk_writel(val, c->reg);
+                        c->div = i;
+                        c->mul = 1;
+                        ret = 0;
+                        break;
+                }
+        }
+
+        return ret;
+}
+
+static long tegra30_bus_clk_round_rate(struct clk_hw *hw, unsigned long rate,
+                                unsigned long *prate)
+{
+        unsigned long parent_rate = *prate;
+        s64 divider;
+
+        if (rate >= parent_rate)
+                return parent_rate;
+
+        divider = parent_rate;
+        divider += rate - 1;
+        do_div(divider, rate);
+
+        if (divider < 0)
+                return divider;
+
+        if (divider > 4)
+                divider = 4;
+        do_div(parent_rate, divider);
+
+        return parent_rate;
+}
+
+struct clk_ops tegra30_bus_ops = {
+        .is_enabled = tegra30_bus_clk_is_enabled,
+        .enable = tegra30_bus_clk_enable,
+        .disable = tegra30_bus_clk_disable,
+        .set_rate = tegra30_bus_clk_set_rate,
+        .round_rate = tegra30_bus_clk_round_rate,
+        .recalc_rate = tegra30_bus_clk_recalc_rate,
+};
+
 /* Blink output functions */
 static int tegra30_blink_clk_is_enabled(struct clk_hw *hw)
 {
@@ -2280,12 +2413,93 @@ static void tegra30_disable_cpu_clock(u32 cpu)
                reg_clk_base + TEGRA_CLK_RST_CONTROLLER_CLK_CPU_CMPLX);
 }
 
+#ifdef CONFIG_PM_SLEEP
+static bool tegra30_cpu_rail_off_ready(void)
+{
+        unsigned int cpu_rst_status;
+        int cpu_pwr_status;
+
+        cpu_rst_status = readl(reg_clk_base +
+                               TEGRA30_CLK_RST_CONTROLLER_CPU_CMPLX_STATUS);
+        cpu_pwr_status = tegra_powergate_is_powered(TEGRA_POWERGATE_CPU1) ||
+                         tegra_powergate_is_powered(TEGRA_POWERGATE_CPU2) ||
+                         tegra_powergate_is_powered(TEGRA_POWERGATE_CPU3);
+
+        if (((cpu_rst_status & 0xE) != 0xE) || cpu_pwr_status)
+                return false;
+
+        return true;
+}
+
+static void tegra30_cpu_clock_suspend(void)
+{
+        /* switch coresite to clk_m, save off original source */
+        tegra30_cpu_clk_sctx.clk_csite_src =
+                                readl(reg_clk_base + CLK_RESET_SOURCE_CSITE);
+        writel(3<<30, reg_clk_base + CLK_RESET_SOURCE_CSITE);
+
+        tegra30_cpu_clk_sctx.cpu_burst =
+                                readl(reg_clk_base + CLK_RESET_CCLK_BURST);
+        tegra30_cpu_clk_sctx.pllx_base =
+                                readl(reg_clk_base + CLK_RESET_PLLX_BASE);
+        tegra30_cpu_clk_sctx.pllx_misc =
+                                readl(reg_clk_base + CLK_RESET_PLLX_MISC);
+        tegra30_cpu_clk_sctx.cclk_divider =
+                                readl(reg_clk_base + CLK_RESET_CCLK_DIVIDER);
+}
+
+static void tegra30_cpu_clock_resume(void)
+{
+        unsigned int reg, policy;
+
+        /* Is CPU complex already running on PLLX? */
+        reg = readl(reg_clk_base + CLK_RESET_CCLK_BURST);
+        policy = (reg >> CLK_RESET_CCLK_BURST_POLICY_SHIFT) & 0xF;
+
+        if (policy == CLK_RESET_CCLK_IDLE_POLICY)
+                reg = (reg >> CLK_RESET_CCLK_IDLE_POLICY_SHIFT) & 0xF;
+        else if (policy == CLK_RESET_CCLK_RUN_POLICY)
+                reg = (reg >> CLK_RESET_CCLK_RUN_POLICY_SHIFT) & 0xF;
+        else
+                BUG();
+
+        if (reg != CLK_RESET_CCLK_BURST_POLICY_PLLX) {
+                /* restore PLLX settings if CPU is on different PLL */
+                writel(tegra30_cpu_clk_sctx.pllx_misc,
+                                        reg_clk_base + CLK_RESET_PLLX_MISC);
+                writel(tegra30_cpu_clk_sctx.pllx_base,
+                                        reg_clk_base + CLK_RESET_PLLX_BASE);
+
+                /* wait for PLL stabilization if PLLX was enabled */
+                if (tegra30_cpu_clk_sctx.pllx_base & (1 << 30))
+                        udelay(300);
+        }
+
+        /*
+         * Restore original burst policy setting for calls resulting from CPU
+         * LP2 in idle or system suspend.
+         */
+        writel(tegra30_cpu_clk_sctx.cclk_divider,
+                                        reg_clk_base + CLK_RESET_CCLK_DIVIDER);
+        writel(tegra30_cpu_clk_sctx.cpu_burst,
+                                        reg_clk_base + CLK_RESET_CCLK_BURST);
+
+        writel(tegra30_cpu_clk_sctx.clk_csite_src,
+                                        reg_clk_base + CLK_RESET_SOURCE_CSITE);
+}
+#endif
+
 static struct tegra_cpu_car_ops tegra30_cpu_car_ops = {
         .wait_for_reset = tegra30_wait_cpu_in_reset,
         .put_in_reset   = tegra30_put_cpu_in_reset,
         .out_of_reset   = tegra30_cpu_out_of_reset,
         .enable_clock   = tegra30_enable_cpu_clock,
         .disable_clock  = tegra30_disable_cpu_clock,
+#ifdef CONFIG_PM_SLEEP
+        .rail_off_ready = tegra30_cpu_rail_off_ready,
+        .suspend        = tegra30_cpu_clock_suspend,
+        .resume         = tegra30_cpu_clock_resume,
+#endif
 };
 
 void __init tegra30_cpu_car_ops_init(void)