sunxi: H616: dram: const-ify DRAM function parameters

There are quite some functions in the Allwinner H616 DRAM "driver", some
of them actually change the parameters in the structure passed to them,
but many are actually not.
To increase the optimisation potential for the code, mark those functions
that just read members of the passed dram_para struct as "const".
This in itself does not decrease the code size, but lays the groundwork
for future changes doing so.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

diff --git a/arch/arm/include/asm/arch-sunxi/dram_sun50i_h616.h b/arch/arm/include/asm/arch-sunxi/dram_sun50i_h616.h
index 6db869c..34d19f7 100644 (file)
--- a/arch/arm/include/asm/arch-sunxi/dram_sun50i_h616.h
+++ b/arch/arm/include/asm/arch-sunxi/dram_sun50i_h616.h
@@ -171,6 +171,6 @@ static inline int ns_to_t(int nanoseconds)
        return DIV_ROUND_UP(ctrl_freq * nanoseconds, 1000);
 }
 
-void mctl_set_timing_params(struct dram_para *para);
+void mctl_set_timing_params(const struct dram_para *para);
 
 #endif /* _SUNXI_DRAM_SUN50I_H616_H */

diff --git a/arch/arm/mach-sunxi/dram_sun50i_h616.c b/arch/arm/mach-sunxi/dram_sun50i_h616.c
index 02f6b2a..e0ee764 100644 (file)
--- a/arch/arm/mach-sunxi/dram_sun50i_h616.c
+++ b/arch/arm/mach-sunxi/dram_sun50i_h616.c
@@ -92,7 +92,7 @@ static void mctl_set_master_priority(void)
        dmb();
 }
 
-static void mctl_sys_init(struct dram_para *para)
+static void mctl_sys_init(u32 clk_rate)
 {
        struct sunxi_ccm_reg * const ccm =
                        (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
@@ -114,7 +114,7 @@ static void mctl_sys_init(struct dram_para *para)
 
        /* Set PLL5 rate to doubled DRAM clock rate */
        writel(CCM_PLL5_CTRL_EN | CCM_PLL5_LOCK_EN | CCM_PLL5_OUT_EN |
-              CCM_PLL5_CTRL_N(para->clk * 2 / 24), &ccm->pll5_cfg);
+              CCM_PLL5_CTRL_N(clk_rate * 2 / 24), &ccm->pll5_cfg);
        mctl_await_completion(&ccm->pll5_cfg, CCM_PLL5_LOCK, CCM_PLL5_LOCK);
 
        /* Configure DRAM mod clock */
@@ -141,7 +141,7 @@ static void mctl_sys_init(struct dram_para *para)
        writel(0x8000, &mctl_ctl->clken);
 }
 
-static void mctl_set_addrmap(struct dram_para *para)
+static void mctl_set_addrmap(const struct dram_para *para)
 {
        struct sunxi_mctl_ctl_reg * const mctl_ctl =
                        (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
@@ -234,7 +234,7 @@ static const u8 phy_init[] = {
        0x09, 0x05, 0x18
 };
 
-static void mctl_phy_configure_odt(struct dram_para *para)
+static void mctl_phy_configure_odt(const struct dram_para *para)
 {
        unsigned int val;
 
@@ -281,7 +281,7 @@ static void mctl_phy_configure_odt(struct dram_para *para)
        dmb();
 }
 
-static bool mctl_phy_write_leveling(struct dram_para *para)
+static bool mctl_phy_write_leveling(const struct dram_para *para)
 {
        bool result = true;
        u32 val;
@@ -336,7 +336,7 @@ static bool mctl_phy_write_leveling(struct dram_para *para)
        return result;
 }
 
-static bool mctl_phy_read_calibration(struct dram_para *para)
+static bool mctl_phy_read_calibration(const struct dram_para *para)
 {
        bool result = true;
        u32 val, tmp;
@@ -395,7 +395,7 @@ static bool mctl_phy_read_calibration(struct dram_para *para)
        return result;
 }
 
-static bool mctl_phy_read_training(struct dram_para *para)
+static bool mctl_phy_read_training(const struct dram_para *para)
 {
        u32 val1, val2, *ptr1, *ptr2;
        bool result = true;
@@ -484,7 +484,7 @@ static bool mctl_phy_read_training(struct dram_para *para)
        return result;
 }
 
-static bool mctl_phy_write_training(struct dram_para *para)
+static bool mctl_phy_write_training(const struct dram_para *para)
 {
        u32 val1, val2, *ptr1, *ptr2;
        bool result = true;
@@ -572,7 +572,7 @@ static bool mctl_phy_write_training(struct dram_para *para)
        return result;
 }
 
-static void mctl_phy_bit_delay_compensation(struct dram_para *para)
+static void mctl_phy_bit_delay_compensation(const struct dram_para *para)
 {
        u32 *ptr, val;
        int i;
@@ -773,7 +773,7 @@ static void mctl_phy_bit_delay_compensation(struct dram_para *para)
        }
 }
 
-static void mctl_phy_ca_bit_delay_compensation(struct dram_para *para)
+static void mctl_phy_ca_bit_delay_compensation(const struct dram_para *para)
 {
        u32 val, *ptr;
        int i;
@@ -822,7 +822,7 @@ static void mctl_phy_ca_bit_delay_compensation(struct dram_para *para)
        }
 }
 
-static bool mctl_phy_init(struct dram_para *para)
+static bool mctl_phy_init(const struct dram_para *para)
 {
        struct sunxi_mctl_com_reg * const mctl_com =
                        (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
@@ -991,7 +991,7 @@ static bool mctl_phy_init(struct dram_para *para)
        return true;
 }
 
-static bool mctl_ctrl_init(struct dram_para *para)
+static bool mctl_ctrl_init(const struct dram_para *para)
 {
        struct sunxi_mctl_com_reg * const mctl_com =
                        (struct sunxi_mctl_com_reg *)SUNXI_DRAM_COM_BASE;
@@ -1073,9 +1073,9 @@ static bool mctl_ctrl_init(struct dram_para *para)
        return true;
 }
 
-static bool mctl_core_init(struct dram_para *para)
+static bool mctl_core_init(const struct dram_para *para)
 {
-       mctl_sys_init(para);
+       mctl_sys_init(para->clk);
 
        return mctl_ctrl_init(para);
 }
@@ -1147,7 +1147,7 @@ static void mctl_auto_detect_dram_size(struct dram_para *para)
        }
 }
 
-static unsigned long mctl_calc_size(struct dram_para *para)
+static unsigned long mctl_calc_size(const struct dram_para *para)
 {
        u8 width = para->bus_full_width ? 4 : 2;
 

diff --git a/arch/arm/mach-sunxi/dram_timings/h616_ddr3_1333.c b/arch/arm/mach-sunxi/dram_timings/h616_ddr3_1333.c
index eea4d6a..232b4fe 100644 (file)
--- a/arch/arm/mach-sunxi/dram_timings/h616_ddr3_1333.c
+++ b/arch/arm/mach-sunxi/dram_timings/h616_ddr3_1333.c
@@ -15,7 +15,7 @@
 #include <asm/arch/dram.h>
 #include <asm/arch/cpu.h>
 
-void mctl_set_timing_params(struct dram_para *para)
+void mctl_set_timing_params(const struct dram_para *para)
 {
        struct sunxi_mctl_ctl_reg * const mctl_ctl =
                        (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;