[U-Boot] [PATCH v3 08/14] MIPS: Add support for Microchip PIC32MZ[DA] SoC family.

Purna Chandra Mandal
2016-01-12T10:18:23Z

Add Microchip PIC32MZ[DA] SoC family support.

Signed-off-by: Purna Chandra Mandal <purna.mandal@microchip.com>

---

Changes in v3:
- drop forcing CONFIG_MIPS_BOOT_* selection in mach-pic32/Kconfig
- indent assembly instructions in delay slot
- made GPIO-nodes child of pinctrl-node in devicetree
- replace pic32_ioremap() with ioremap()

Changes in v2:
- drop board_early_init_f
- use macro LEAF(), END() for lowlevel_init assembly
- move initialization of board_init_f() argument to common start.S
- move initdram() from board/microchip/ to mach-pic32/cpu.c
- remove MIPS virtual address in favor physical one in dts file

arch/mips/dts/pic32mzda.dtsi | 153 ++++++++++++++++++++++++++++++
arch/mips/mach-pic32/Kconfig | 20 +++-
arch/mips/mach-pic32/Makefile | 2 +-
arch/mips/mach-pic32/cpu.c | 147 ++++++++++++++++++++++++++++
arch/mips/mach-pic32/include/mach/pic32.h | 3 +
arch/mips/mach-pic32/lowlevel_init.S | 27 ++++++
arch/mips/mach-pic32/reset.c | 36 +++++++
7 files changed, 386 insertions(+), 2 deletions(-)
create mode 100644 arch/mips/dts/pic32mzda.dtsi
create mode 100644 arch/mips/mach-pic32/lowlevel_init.S
create mode 100644 arch/mips/mach-pic32/reset.c

diff --git a/arch/mips/dts/pic32mzda.dtsi b/arch/mips/dts/pic32mzda.dtsi
new file mode 100644
index 0000000..fe8b13a
--- /dev/null
+++ b/arch/mips/dts/pic32mzda.dtsi
@@ -0,0 +1,153 @@
+/*
+ * Copyright 2015 Microchip Technology, Inc.
+ * Purna Chandra Mandal, <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <dt-bindings/interrupt-controller/irq.h>
+#include <dt-bindings/clock/microchip,clock.h>
+#include <dt-bindings/gpio/gpio.h>
+#include "skeleton.dtsi"
+
+/ {
+ compatible = "microchip,pic32mzda", "microchip,pic32mz";
+
+ aliases {
+ gpio0 = &gpioA;
+ gpio1 = &gpioB;
+ gpio2 = &gpioC;
+ gpio3 = &gpioD;
+ gpio4 = &gpioE;
+ gpio5 = &gpioF;
+ gpio6 = &gpioG;
+ gpio7 = &gpioH;
+ gpio8 = &gpioJ;
+ gpio9 = &gpioK;
+ };
+
+ cpus {
+ cpu at 0 {
+ compatible = "mips,mips14kc";
+ };
+ };
+
+ clock: clk at 1f801200 {
+ compatible = "microchip,pic32mzda_clk";
+ reg = <0x1f801200 0x1000>;
+ clock-cells = <1>;
+ };
+
+ uart1: serial at 1f822000 {
+ compatible = "microchip,pic32mzda-uart";
+ reg = <0x1f822000 0x50>;
+ interrupts = <112 IRQ_TYPE_LEVEL_HIGH>;
+ status = "disabled";
+ clocks = <&clock PB2CLK>;
+ };
+
+ uart2: serial at 1f822200 {
+ compatible = "microchip,pic32mzda-uart";
+ reg = <0x1f822200 0x50>;
+ interrupts = <145 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&clock PB2CLK>;
+ status = "disabled";
+ };
+
+ uart6: serial at 1f822a00 {
+ compatible = "microchip,pic32mzda-uart";
+ reg = <0x1f822a00 0x50>;
+ interrupts = <188 IRQ_TYPE_LEVEL_HIGH>;
+ clocks = <&clock PB2CLK>;
+ status = "disabled";
+ };
+
+ evic: interrupt-controller at 1f810000 {
+ compatible = "microchip,pic32mzda-evic";
+ interrupt-controller;
+ #interrupt-cells = <2>;
+ reg = <0x1f810000 0x1000>;
+ };
+
+ pinctrl: pinctrl at 1f801400 {
+ compatible = "microchip,pic32mzda-pinctrl";
+ reg = <0x1f801400 0x100>, /* in */
+ <0x1f801500 0x200>, /* out */
+ <0x1f860000 0xa00>; /* port */
+ reg-names = "ppsin","ppsout","port";
+ status = "disabled";
+
+ ranges = <0 0x1f860000 0xa00>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+ gpioA: gpio0 at 0 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x000 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioB: gpio1 at 100 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x100 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioC: gpio2 at 200 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x200 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioD: gpio3 at 300 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x300 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioE: gpio4 at 400 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x400 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioF: gpio5 at 500 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x500 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioG: gpio6 at 600 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x600 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioH: gpio7 at 700 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x700 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioJ: gpio8 at 800 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x800 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpioK: gpio9 at 900 {
+ compatible = "microchip,pic32mzda-gpio";
+ reg = <0x900 0x48>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+ };
+};
diff --git a/arch/mips/mach-pic32/Kconfig b/arch/mips/mach-pic32/Kconfig
index c1cc5e3..74be9fb 100644
--- a/arch/mips/mach-pic32/Kconfig
+++ b/arch/mips/mach-pic32/Kconfig
@@ -2,6 +2,24 @@ menu "Microchip PIC32 platforms"
depends on MACH_PIC32

config SYS_SOC
- default "none"
+ default "pic32mzda" if SOC_PIC32MZDA
+
+choice
+ prompt "PIC32 SoC select"
+
+config SOC_PIC32MZDA
+ bool "Microchip PIC32MZ[DA] family"
+ select SUPPORTS_LITTLE_ENDIAN
+ select SUPPORTS_CPU_MIPS32_R1
+ select SUPPORTS_CPU_MIPS32_R2
+ select MIPS_L1_CACHE_SHIFT_4
+ select SYS_MIPS_CACHE_INIT_RAM_LOAD
+ select DM_SERIAL
+ select PIC32_SERIAL
+ select PIC32_PINCTRL
+ help
+ This supports Microchip PIC32MZ[DA] family of microcontrollers.
+
+endchoice

endmenu
diff --git a/arch/mips/mach-pic32/Makefile b/arch/mips/mach-pic32/Makefile
index cb42607..e321e65 100644
--- a/arch/mips/mach-pic32/Makefile
+++ b/arch/mips/mach-pic32/Makefile
@@ -4,4 +4,4 @@
# SPDX-License-Identifier: GPL-2.0+
#

-obj-y = cpu.o
+obj-y = cpu.o lowlevel_init.o reset.o
\ No newline at end of file
diff --git a/arch/mips/mach-pic32/cpu.c b/arch/mips/mach-pic32/cpu.c
index 58fd3ab..8ecdef8 100644
--- a/arch/mips/mach-pic32/cpu.c
+++ b/arch/mips/mach-pic32/cpu.c
@@ -6,8 +6,155 @@
*
*/
#include <common.h>
+#include <dm.h>
+#include <clk.h>
+#include <debug_uart.h>
+#include <linux/compiler.h>
+#include <asm/io.h>
+#include <asm/mipsregs.h>
+#include <mach/pic32.h>
+#include <mach/ddr.h>
+#include <dt-bindings/clock/microchip,clock.h>

+/* Flash prefetch */
+#define PRECON 0x00
+
+/* Flash ECCCON */
+#define ECC_MASK 0x03
+#define ECC_SHIFT 4
+
+#define CLK_MHZ(x) ((x) / 1000000)
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static ulong clk_get_cpu_rate(void)
+{
+ int ret;
+ struct udevice *dev;
+
+ ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+ if (ret) {
+ panic("uclass-clk: device not found\n");
+ return 0;
+ }
+
+ return clk_get_rate(dev);
+}
+
+/* initialize prefetch module related to cpu_clk */
+static void prefetch_init(void)
+{
+ struct pic32_reg_atomic *regs;
+ const void __iomem *base;
+ int v, nr_waits;
+ ulong rate;
+
+ /* cpu frequency in MHZ */
+ rate = clk_get_cpu_rate() / 1000000;
+
+ /* get flash ECC type */
+ base = pic32_get_syscfg_base();
+ v = (readl(base + CFGCON) >> ECC_SHIFT) & ECC_MASK;
+
+ if (v < 2) {
+ if (rate < 66)
+ nr_waits = 0;
+ else if (rate < 133)
+ nr_waits = 1;
+ else
+ nr_waits = 2;
+ } else {
+ if (rate <= 83)
+ nr_waits = 0;
+ else if (rate <= 166)
+ nr_waits = 1;
+ else
+ nr_waits = 2;
+ }
+
+ regs = ioremap(PREFETCH_BASE + PRECON, sizeof(*regs));
+ writel(nr_waits, &regs->raw);
+
+ /* Enable prefetch for all */
+ writel(0x30, &regs->set);
+ iounmap(regs);
+}
+
+/* arch specific CPU init after DM */
+int arch_cpu_init_dm(void)
+{
+ /* flash prefetch */
+ prefetch_init();
+ return 0;
+}
+
+/* Un-gate DDR2 modules (gated by default) */
+static void ddr2_pmd_ungate(void)
+{
+ void __iomem *regs;
+
+ regs = pic32_get_syscfg_base();
+ writel(0, regs + PMD7);
+}
+
+/* initialize the DDR2 Controller and DDR2 PHY */
phys_size_t initdram(int board_type)
{
+ ddr2_pmd_ungate();
+ ddr2_phy_init();
+ ddr2_ctrl_init();
+ return ddr2_calculate_size();
+}
+
+int misc_init_r(void)
+{
+ set_io_port_base(0);
+ return 0;
+}
+
+#ifdef CONFIG_DISPLAY_BOARDINFO
+const char *get_core_name(void)
+{
+ u32 proc_id;
+ const char *str;
+
+ proc_id = read_c0_prid();
+ switch (proc_id) {
+ case 0x19e28:
+ str = "PIC32MZ[DA]";
+ break;
+ default:
+ str = "UNKNOWN";
+ }
+
+ return str;
+}
+#endif
+#ifdef CONFIG_CMD_CLK
+int soc_clk_dump(void)
+{
+ int i, ret;
+ struct udevice *dev;
+
+ ret = uclass_get_device(UCLASS_CLK, 0, &dev);
+ if (ret) {
+ printf("clk-uclass not found\n");
+ return ret;
+ }
+
+ printf("PLL Speed: %lu MHz\n",
+ CLK_MHZ(clk_get_periph_rate(dev, PLLCLK)));
+ printf("CPU Speed: %lu MHz\n", CLK_MHZ(clk_get_rate(dev)));
+ printf("MPLL Speed: %lu MHz\n",
+ CLK_MHZ(clk_get_periph_rate(dev, MPLL)));
+
+ for (i = PB1CLK; i <= PB7CLK; i++)
+ printf("PB%d Clock Speed: %lu MHz\n", i - PB1CLK + 1,
+ CLK_MHZ(clk_get_periph_rate(dev, i)));
+
+ for (i = REF1CLK; i <= REF5CLK; i++)
+ printf("REFO%d Clock Speed: %lu MHz\n", i - REF1CLK + 1,
+ CLK_MHZ(clk_get_periph_rate(dev, i)));
return 0;
}
+#endif
diff --git a/arch/mips/mach-pic32/include/mach/pic32.h b/arch/mips/mach-pic32/include/mach/pic32.h
index 7e41810..16bfacf 100644
--- a/arch/mips/mach-pic32/include/mach/pic32.h
+++ b/arch/mips/mach-pic32/include/mach/pic32.h
@@ -73,4 +73,7 @@ static inline void __iomem *pic32_get_syscfg_base(void)
return (void __iomem *)CKSEG1ADDR(PIC32_CFG_BASE);
}

+/* Core */
+const char *get_core_name(void);
+
#endif /* __PIC32_REGS_H__ */
diff --git a/arch/mips/mach-pic32/lowlevel_init.S b/arch/mips/mach-pic32/lowlevel_init.S
new file mode 100644
index 0000000..e37bebb
--- /dev/null
+++ b/arch/mips/mach-pic32/lowlevel_init.S
@@ -0,0 +1,27 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+*/
+
+#include <config.h>
+#include <asm/regdef.h>
+#include <asm/mipsregs.h>
+#include <asm/asm.h>
+
+LEAF(lowlevel_init)
+ /*
+ * Establish Cause
+ * (set IV bit)
+ */
+ li t1, 0x00800000
+ mtc0 t1, CP0_CAUSE
+
+ /* Establish Wired (and Random) */
+ mtc0 zero, CP0_WIRED
+ nop
+
+ jr ra
+ nop
+ END(lowlevel_init)
diff --git a/arch/mips/mach-pic32/reset.c b/arch/mips/mach-pic32/reset.c
new file mode 100644
index 0000000..66c6833
--- /dev/null
+++ b/arch/mips/mach-pic32/reset.c
@@ -0,0 +1,36 @@
+/*
+ * (c) 2015 Purna Chandra Mandal <purna.mandal@microchip.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <mach/pic32.h>
+
+/* SYSKEY */
+#define UNLOCK_KEY1 0xaa996655
+#define UNLOCK_KEY2 0x556699aa
+#define LOCK_KEY 0
+
+#define RSWRST 0x1250
+
+void _machine_restart(void)
+{
+ void __iomem *base;
+
+ base = pic32_get_syscfg_base();
+
+ /* unlock sequence */
+ writel(LOCK_KEY, base + SYSKEY);
+ writel(UNLOCK_KEY1, base + SYSKEY);
+ writel(UNLOCK_KEY2, base + SYSKEY);
+
+ /* soft reset */
+ writel(0x1, base + RSWRST);
+ (void) readl(base + RSWRST);
+
+ while (1)
+ ;
+}
--
1.8.3.1