mvebu: new subtarget cortex A53

This commit introduces new subtarget for Marvell EBU Armada Cortex A53
processor based devices.

The first device is Globalscale ESPRESSObin. Some hardware specs:

SoC: Marvell Armada 3700LP (88F3720) dual core ARM Cortex A53
     processor up to 1.2GHz
RAM: 512MB, 1GB or 2GB DDR3
Storage: SATA interface
         µSD card slot with footprint for an optional 4GB EMMC
         4MB SPI NOR flash for bootloader
Ethernet: Topaz Networking Switch (88E6341) with 3x GbE ports
Connectors: USB 3.0
            USB 2.0
            µUSB port connected to PL2303SA (USB to serial bridge
            controller) for UART access
Expansion: 2x 46-pin GPIO headers for accessories and shields with
           I2C, GPIOs, PWM, UART, SPI, MMC, etc
           MiniPCIe slot
Misc: Reset button, JTAG interface

Currently booting only from µSD card is supported.
The boards depending on date of dispatch can come with various U-Boot
versions. For the newest version 2017.03-armada-17.10 no manual
intervention should be needed to boot OpenWrt image. For the older ones
it's necessary to modify default U-Boot environment:

 1. Interrupt boot process to run U-Boot command line,

 2. Run following commands:
    (for version 2017.03-armada-17.06 and 2017.03-armada-17.08)
     setenv bootcmd "load mmc 0:1 0x4d00000 boot.scr; source 0x4d00000"
     saveenv

    (for version 2015.01-armada-17.02 and 2015.01-armada-17.04)
     setenv bootargs "console=ttyMV0,115200 root=/dev/mmcblk0p2 rw rootwait"
     setenv bootcmd "ext4load mmc 0:1 ${fdt_addr} armada-3720-espressobin.dtb; ext4load mmc 0:1 ${kernel_addr} Image; booti ${kernel_addr} - ${fdt_addr}"
     saveenv

 3. Poweroff, insert SD card with OpenWrt image, boot and enjoy.

Signed-off-by: Tomasz Maciej Nowak <tomek_n@o2.pl>

1 files changed, 178 insertions, 0 deletions

diff --git a/target/linux/mvebu/patches-4.14/501-clk-mvebu-armada-37xx-periph-prepare-cpu-clk-to-be-u.patch b/target/linux/mvebu/patches-4.14/501-clk-mvebu-armada-37xx-periph-prepare-cpu-clk-to-be-u.patch
new file mode 100644
index 0000000000..f9dec9f2ee
--- /dev/null
+++ b/target/linux/mvebu/patches-4.14/501-clk-mvebu-armada-37xx-periph-prepare-cpu-clk-to-be-u.patch
@@ -0,0 +1,178 @@
+From 9818a7a4fd10f72537cdf2a5ec3402f2c245ea24 Mon Sep 17 00:00:00 2001
+From: Gregory CLEMENT <gregory.clement@free-electrons.com>
+Date: Thu, 30 Nov 2017 14:40:28 +0100
+Subject: clk: mvebu: armada-37xx-periph: prepare cpu clk to be
+ used with DVFS
+
+When DVFS will be enabled then the cpu clk will use a different set of
+register at run time. That means that we won't be able to use the common
+callback and need to use our own ones.
+
+This patch prepares this change by switching on our own set of callbacks
+without modifying the behavior of the clocks.
+
+Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
+Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
+---
+ drivers/clk/mvebu/armada-37xx-periph.c | 82 ++++++++++++++++++++++++++++++----
+ 1 file changed, 73 insertions(+), 9 deletions(-)
+
+--- a/drivers/clk/mvebu/armada-37xx-periph.c
++++ b/drivers/clk/mvebu/armada-37xx-periph.c
+@@ -46,7 +46,17 @@ struct clk_double_div {
+ 	u8 shift2;
+ };
+ 
++struct clk_pm_cpu {
++	struct clk_hw hw;
++	void __iomem *reg_mux;
++	u8 shift_mux;
++	u32 mask_mux;
++	void __iomem *reg_div;
++	u8 shift_div;
++};
++
+ #define to_clk_double_div(_hw) container_of(_hw, struct clk_double_div, hw)
++#define to_clk_pm_cpu(_hw) container_of(_hw, struct clk_pm_cpu, hw)
+ 
+ struct clk_periph_data {
+ 	const char *name;
+@@ -55,6 +65,7 @@ struct clk_periph_data {
+ 	struct clk_hw *mux_hw;
+ 	struct clk_hw *rate_hw;
+ 	struct clk_hw *gate_hw;
++	struct clk_hw *muxrate_hw;
+ 	bool is_double_div;
+ };
+ 
+@@ -81,6 +92,7 @@ static const struct clk_div_table clk_ta
+ };
+ 
+ static const struct clk_ops clk_double_div_ops;
++static const struct clk_ops clk_pm_cpu_ops;
+ 
+ #define PERIPH_GATE(_name, _bit)		\
+ struct clk_gate gate_##_name = {		\
+@@ -122,6 +134,18 @@ struct clk_divider rate_##_name = {		\
+ 	}					\
+ };
+ 
++#define PERIPH_PM_CPU(_name, _shift1, _reg, _shift2)	\
++struct clk_pm_cpu muxrate_##_name = {		\
++	.reg_mux = (void *)TBG_SEL,		\
++	.mask_mux = 3,				\
++	.shift_mux = _shift1,			\
++	.reg_div = (void *)_reg,		\
++	.shift_div = _shift2,			\
++	.hw.init = &(struct clk_init_data){	\
++		.ops =  &clk_pm_cpu_ops,	\
++	}					\
++};
++
+ #define PERIPH_CLK_FULL_DD(_name, _bit, _shift, _reg1, _reg2, _shift1, _shift2)\
+ static PERIPH_GATE(_name, _bit);			    \
+ static PERIPH_MUX(_name, _shift);			    \
+@@ -136,10 +160,6 @@ static PERIPH_DIV(_name, _reg, _shift1,
+ static PERIPH_GATE(_name, _bit);			\
+ static PERIPH_DIV(_name, _reg, _shift, _table);
+ 
+-#define PERIPH_CLK_MUX_DIV(_name, _shift,  _reg, _shift_div, _table)	\
+-static PERIPH_MUX(_name, _shift);			    \
+-static PERIPH_DIV(_name, _reg, _shift_div, _table);
+-
+ #define PERIPH_CLK_MUX_DD(_name, _shift, _reg1, _reg2, _shift1, _shift2)\
+ static PERIPH_MUX(_name, _shift);			    \
+ static PERIPH_DOUBLEDIV(_name, _reg1, _reg2, _shift1, _shift2);
+@@ -180,13 +200,12 @@ static PERIPH_DOUBLEDIV(_name, _reg1, _r
+ 	  .rate_hw = &rate_##_name.hw,				\
+ 	}
+ 
+-#define REF_CLK_MUX_DIV(_name)				\
++#define REF_CLK_PM_CPU(_name)				\
+ 	{ .name = #_name,				\
+ 	  .parent_names = (const char *[]){ "TBG-A-P",	\
+ 	      "TBG-B-P", "TBG-A-S", "TBG-B-S"},		\
+ 	  .num_parents = 4,				\
+-	  .mux_hw = &mux_##_name.hw,			\
+-	  .rate_hw = &rate_##_name.hw,			\
++	  .muxrate_hw = &muxrate_##_name.hw,		\
+ 	}
+ 
+ #define REF_CLK_MUX_DD(_name)				\
+@@ -216,7 +235,7 @@ PERIPH_CLK_FULL_DD(ddr_fclk, 21, 16, DIV
+ PERIPH_CLK_FULL(trace, 22, 18, DIV_SEL0, 20, clk_table6);
+ PERIPH_CLK_FULL(counter, 23, 20, DIV_SEL0, 23, clk_table6);
+ PERIPH_CLK_FULL_DD(eip97, 24, 24, DIV_SEL2, DIV_SEL2, 22, 19);
+-PERIPH_CLK_MUX_DIV(cpu, 22, DIV_SEL0, 28, clk_table6);
++static PERIPH_PM_CPU(cpu, 22, DIV_SEL0, 28);
+ 
+ static struct clk_periph_data data_nb[] = {
+ 	REF_CLK_FULL_DD(mmc),
+@@ -235,7 +254,7 @@ static struct clk_periph_data data_nb[]
+ 	REF_CLK_FULL(trace),
+ 	REF_CLK_FULL(counter),
+ 	REF_CLK_FULL_DD(eip97),
+-	REF_CLK_MUX_DIV(cpu),
++	REF_CLK_PM_CPU(cpu),
+ 	{ },
+ };
+ 
+@@ -297,6 +316,37 @@ static const struct clk_ops clk_double_d
+ 	.recalc_rate = clk_double_div_recalc_rate,
+ };
+ 
++static u8 clk_pm_cpu_get_parent(struct clk_hw *hw)
++{
++	struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw);
++	int num_parents = clk_hw_get_num_parents(hw);
++	u32 val;
++
++	val = readl(pm_cpu->reg_mux) >> pm_cpu->shift_mux;
++	val &= pm_cpu->mask_mux;
++
++	if (val >= num_parents)
++		return -EINVAL;
++
++	return val;
++}
++
++static unsigned long clk_pm_cpu_recalc_rate(struct clk_hw *hw,
++					    unsigned long parent_rate)
++{
++	struct clk_pm_cpu *pm_cpu = to_clk_pm_cpu(hw);
++	unsigned int div;
++
++	div = get_div(pm_cpu->reg_div, pm_cpu->shift_div);
++
++	return DIV_ROUND_UP_ULL((u64)parent_rate, div);
++}
++
++static const struct clk_ops clk_pm_cpu_ops = {
++	.get_parent = clk_pm_cpu_get_parent,
++	.recalc_rate = clk_pm_cpu_recalc_rate,
++};
++
+ static const struct of_device_id armada_3700_periph_clock_of_match[] = {
+ 	{ .compatible = "marvell,armada-3700-periph-clock-nb",
+ 	  .data = data_nb, },
+@@ -356,6 +406,20 @@ static int armada_3700_add_composite_clk
+ 		}
+ 	}
+ 
++	if (data->muxrate_hw) {
++		struct clk_pm_cpu *pmcpu_clk;
++		struct clk_hw *muxrate_hw = data->muxrate_hw;
++
++		pmcpu_clk =  to_clk_pm_cpu(muxrate_hw);
++		pmcpu_clk->reg_mux = reg + (u64)pmcpu_clk->reg_mux;
++		pmcpu_clk->reg_div = reg + (u64)pmcpu_clk->reg_div;
++
++		mux_hw = muxrate_hw;
++		rate_hw = muxrate_hw;
++		mux_ops = muxrate_hw->init->ops;
++		rate_ops = muxrate_hw->init->ops;
++	}
++
+ 	*hw = clk_hw_register_composite(dev, data->name, data->parent_names,
+ 					data->num_parents, mux_hw,
+ 					mux_ops, rate_hw, rate_ops,