mips: ath79: Add AR934x support
authorMarek Vasut <marex@denx.de>
Fri, 6 May 2016 18:10:40 +0000 (20:10 +0200)
committerDaniel Schwierzeck <daniel.schwierzeck@gmail.com>
Fri, 20 May 2016 23:36:39 +0000 (01:36 +0200)
Add support for the Atheros AR934x WiSoCs. This patchs adds complete
system init, including PLL and DRAM init, both of which happen from
full C environment, since the AR934x has proper SRAM.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
Cc: Wills Wang <wills.wang@live.com>
arch/mips/dts/ar934x.dtsi [new file with mode: 0644]
arch/mips/mach-ath79/Kconfig
arch/mips/mach-ath79/Makefile
arch/mips/mach-ath79/ar934x/Makefile [new file with mode: 0644]
arch/mips/mach-ath79/ar934x/clk.c [new file with mode: 0644]
arch/mips/mach-ath79/ar934x/cpu.c [new file with mode: 0644]
arch/mips/mach-ath79/ar934x/ddr.c [new file with mode: 0644]
arch/mips/mach-ath79/include/mach/ar71xx_regs.h
arch/mips/mach-ath79/include/mach/ath79.h

diff --git a/arch/mips/dts/ar934x.dtsi b/arch/mips/dts/ar934x.dtsi
new file mode 100644 (file)
index 0000000..7a036a8
--- /dev/null
@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2016 Marek Vasut <marex@denx.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include "skeleton.dtsi"
+
+/ {
+       compatible = "qca,ar934x";
+
+       #address-cells = <1>;
+       #size-cells = <1>;
+
+       cpus {
+               #address-cells = <1>;
+               #size-cells = <0>;
+
+               cpu@0 {
+                       device_type = "cpu";
+                       compatible = "mips,mips74Kc";
+                       reg = <0>;
+               };
+       };
+
+       clocks {
+               #address-cells = <1>;
+               #size-cells = <1>;
+               ranges;
+
+               xtal: xtal {
+                       #clock-cells = <0>;
+                       compatible = "fixed-clock";
+                       clock-output-names = "xtal";
+               };
+       };
+
+       ahb {
+               compatible = "simple-bus";
+               ranges;
+
+               #address-cells = <1>;
+               #size-cells = <1>;
+
+               apb {
+                       compatible = "simple-bus";
+                       ranges;
+
+                       #address-cells = <1>;
+                       #size-cells = <1>;
+
+                       ehci0: ehci@1b000100 {
+                               compatible = "generic-ehci";
+                               reg = <0x1b000100 0x100>;
+
+                               status = "disabled";
+                       };
+
+                       uart0: uart@18020000 {
+                               compatible = "ns16550";
+                               reg = <0x18020000 0x20>;
+                               reg-shift = <2>;
+
+                               status = "disabled";
+                       };
+
+                       gmac0: eth@0x19000000 {
+                               compatible = "qca,ag934x-mac";
+                               reg = <0x19000000 0x200>;
+                               phy = <&phy0>;
+                               phy-mode = "rgmii";
+
+                               status = "disabled";
+
+                               mdio {
+                                       #address-cells = <1>;
+                                       #size-cells = <0>;
+                                       phy0: ethernet-phy@0 {
+                                               reg = <0>;
+                                       };
+                               };
+                       };
+
+                       gmac1: eth@0x1a000000 {
+                               compatible = "qca,ag934x-mac";
+                               reg = <0x1a000000 0x200>;
+                               phy = <&phy1>;
+                               phy-mode = "rgmii";
+
+                               status = "disabled";
+
+                               mdio {
+                                       #address-cells = <1>;
+                                       #size-cells = <0>;
+                                       phy1: ethernet-phy@0 {
+                                               reg = <0>;
+                                       };
+                               };
+                       };
+               };
+
+               spi0: spi@1f000000 {
+                       compatible = "qca,ar7100-spi";
+                       reg = <0x1f000000 0x10>;
+
+                       status = "disabled";
+
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+               };
+       };
+};
index f45403bda9466a9f4c17685227ee0dc05d9880e0..527960f4eb7fb65c6948ab7d5a9d497d2a7f1bff 100644 (file)
@@ -13,6 +13,15 @@ config SOC_AR933X
        help
          This supports QCA/Atheros ar933x family SOCs.
 
+config SOC_AR934X
+       bool
+       select SUPPORTS_BIG_ENDIAN
+       select SUPPORTS_CPU_MIPS32_R1
+       select SUPPORTS_CPU_MIPS32_R2
+       select MIPS_TUNE_74KC
+       help
+         This supports QCA/Atheros ar934x family SOCs.
+
 config SOC_QCA953X
        bool
        select SUPPORTS_BIG_ENDIAN
index 160dfaa146f4bfec1415cd287f2355bf1fa202cc..d7e2666a7c92c7357c72ce88bb7bdd700ab3152d 100644 (file)
@@ -7,4 +7,5 @@ obj-y += cpu.o
 obj-y += dram.o
 
 obj-$(CONFIG_SOC_AR933X)       += ar933x/
-obj-$(CONFIG_SOC_QCA953X)      += qca953x/
\ No newline at end of file
+obj-$(CONFIG_SOC_AR934X)       += ar934x/
+obj-$(CONFIG_SOC_QCA953X)      += qca953x/
diff --git a/arch/mips/mach-ath79/ar934x/Makefile b/arch/mips/mach-ath79/ar934x/Makefile
new file mode 100644 (file)
index 0000000..348c65b
--- /dev/null
@@ -0,0 +1,7 @@
+#
+# SPDX-License-Identifier:     GPL-2.0+
+#
+
+obj-y += cpu.o
+obj-y += clk.o
+obj-y += ddr.o
diff --git a/arch/mips/mach-ath79/ar934x/clk.c b/arch/mips/mach-ath79/ar934x/clk.c
new file mode 100644 (file)
index 0000000..9c65184
--- /dev/null
@@ -0,0 +1,334 @@
+/*
+ * Copyright (C) 2016 Marek Vasut <marex@denx.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/addrspace.h>
+#include <asm/types.h>
+#include <mach/ar71xx_regs.h>
+#include <mach/reset.h>
+#include <wait_bit.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * The math for calculating PLL:
+ *                                       NFRAC * 2^8
+ *                               NINT + -------------
+ *                XTAL [MHz]              2^(18 - 1)
+ *   PLL [MHz] = ------------ * ----------------------
+ *                  REFDIV              2^OUTDIV
+ *
+ * Unfortunatelly, there is no way to reliably compute the variables.
+ * The vendor U-Boot port contains macros for various combinations of
+ * CPU PLL / DDR PLL / AHB bus speed and there is no obvious pattern
+ * in those numbers.
+ */
+struct ar934x_pll_config {
+       u8      range;
+       u8      refdiv;
+       u8      outdiv;
+       /* Index 0 is for XTAL=25MHz , Index 1 is for XTAL=40MHz */
+       u8      nint[2];
+};
+
+struct ar934x_clock_config {
+       u16                             cpu_freq;
+       u16                             ddr_freq;
+       u16                             ahb_freq;
+
+       struct ar934x_pll_config        cpu_pll;
+       struct ar934x_pll_config        ddr_pll;
+};
+
+static const struct ar934x_clock_config ar934x_clock_config[] = {
+       { 300, 300, 150, { 1, 1, 1, { 24, 15 } }, { 1, 1, 1, { 24, 15 } } },
+       { 400, 200, 200, { 1, 1, 1, { 32, 20 } }, { 1, 1, 2, { 32, 20 } } },
+       { 400, 400, 200, { 0, 1, 1, { 32, 20 } }, { 0, 1, 1, { 32, 20 } } },
+       { 500, 400, 200, { 1, 1, 0, { 20, 12 } }, { 0, 1, 1, { 32, 20 } } },
+       { 533, 400, 200, { 1, 1, 0, { 21, 13 } }, { 0, 1, 1, { 32, 20 } } },
+       { 533, 500, 250, { 1, 1, 0, { 21, 13 } }, { 0, 1, 0, { 20, 12 } } },
+       { 560, 480, 240, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 19, 12 } } },
+       { 566, 400, 200, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 16, 10 } } },
+       { 566, 450, 225, { 1, 1, 0, { 22, 14 } }, { 0, 1, 1, { 36, 22 } } },
+       { 566, 475, 237, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 19, 11 } } },
+       { 566, 500, 250, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 20, 12 } } },
+       { 566, 525, 262, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 21, 13 } } },
+       { 566, 550, 275, { 1, 1, 0, { 22, 14 } }, { 1, 1, 0, { 22, 13 } } },
+       { 600, 266, 133, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 21, 16 } } },
+       { 600, 266, 200, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 21, 16 } } },
+       { 600, 300, 150, { 0, 1, 0, { 24, 15 } }, { 0, 1, 1, { 24, 15 } } },
+       { 600, 332, 166, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 26, 16 } } },
+       { 600, 332, 200, { 0, 1, 0, { 24, 15 } }, { 1, 1, 1, { 26, 16 } } },
+       { 600, 400, 200, { 0, 1, 0, { 24, 15 } }, { 0, 1, 1, { 32, 20 } } },
+       { 600, 450, 200, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 18, 20 } } },
+       { 600, 500, 250, { 0, 1, 0, { 24, 15 } }, { 1, 1, 0, { 20, 12 } } },
+       { 600, 525, 262, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 21, 20 } } },
+       { 600, 550, 275, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 22, 20 } } },
+       { 600, 575, 287, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 23, 14 } } },
+       { 600, 600, 300, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 24, 20 } } },
+       { 600, 650, 325, { 0, 1, 0, { 24, 15 } }, { 0, 1, 0, { 26, 20 } } },
+       { 650, 600, 300, { 0, 1, 0, { 26, 15 } }, { 0, 1, 0, { 24, 20 } } },
+       { 700, 400, 200, { 3, 1, 0, { 28, 17 } }, { 0, 1, 1, { 32, 20 } } },
+};
+
+static void ar934x_srif_pll_cfg(void __iomem *pll_reg_base, const u32 srif_val)
+{
+       u32 reg;
+       do {
+               writel(0x10810f00, pll_reg_base + 0x4);
+               writel(srif_val, pll_reg_base + 0x0);
+               writel(0xd0810f00, pll_reg_base + 0x4);
+               writel(0x03000000, pll_reg_base + 0x8);
+               writel(0xd0800f00, pll_reg_base + 0x4);
+
+               clrbits_be32(pll_reg_base + 0x8, BIT(30));
+               udelay(5);
+               setbits_be32(pll_reg_base + 0x8, BIT(30));
+               udelay(5);
+
+               wait_for_bit("clk", pll_reg_base + 0xc, BIT(3), 1, 10, 0);
+
+               clrbits_be32(pll_reg_base + 0x8, BIT(30));
+               udelay(5);
+
+               /* Check if CPU SRIF PLL locked. */
+               reg = readl(pll_reg_base + 0x8);
+               reg = (reg & 0x7ffff8) >> 3;
+       } while (reg >= 0x40000);
+}
+
+void ar934x_pll_init(const u16 cpu_mhz, const u16 ddr_mhz, const u16 ahb_mhz)
+{
+       void __iomem *srif_regs = map_physmem(AR934X_SRIF_BASE,
+                                             AR934X_SRIF_SIZE, MAP_NOCACHE);
+       void __iomem *pll_regs = map_physmem(AR71XX_PLL_BASE,
+                                            AR71XX_PLL_SIZE, MAP_NOCACHE);
+       const struct ar934x_pll_config *pll_cfg;
+       int i, pll_nint, pll_refdiv, xtal_40 = 0;
+       u32 reg, cpu_pll, cpu_srif, ddr_pll, ddr_srif;
+
+       /* Configure SRIF PLL with initial values. */
+       writel(0x13210f00, srif_regs + AR934X_SRIF_CPU_DPLL2_REG);
+       writel(0x03000000, srif_regs + AR934X_SRIF_CPU_DPLL3_REG);
+       writel(0x13210f00, srif_regs + AR934X_SRIF_DDR_DPLL2_REG);
+       writel(0x03000000, srif_regs + AR934X_SRIF_DDR_DPLL3_REG);
+       writel(0x03000000, srif_regs + 0x188); /* Undocumented reg :-) */
+
+       /* Test for 40MHz XTAL */
+       reg = get_bootstrap();
+       if (reg & AR934X_BOOTSTRAP_REF_CLK_40) {
+               xtal_40 = 1;
+               cpu_srif = 0x41c00000;
+               ddr_srif = 0x41680000;
+       } else {
+               xtal_40 = 0;
+               cpu_srif = 0x29c00000;
+               ddr_srif = 0x29680000;
+       }
+
+       /* Locate CPU/DDR PLL configuration */
+       for (i = 0; i < ARRAY_SIZE(ar934x_clock_config); i++) {
+               if (cpu_mhz != ar934x_clock_config[i].cpu_freq)
+                       continue;
+               if (ddr_mhz != ar934x_clock_config[i].ddr_freq)
+                       continue;
+               if (ahb_mhz != ar934x_clock_config[i].ahb_freq)
+                       continue;
+
+               /* Entry found */
+               pll_cfg = &ar934x_clock_config[i].cpu_pll;
+               pll_nint = pll_cfg->nint[xtal_40];
+               pll_refdiv = pll_cfg->refdiv;
+               cpu_pll =
+                       (pll_nint << AR934X_PLL_CPU_CONFIG_NINT_SHIFT) |
+                       (pll_refdiv << AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) |
+                       (pll_cfg->range << AR934X_PLL_CPU_CONFIG_RANGE_SHIFT) |
+                       (pll_cfg->outdiv << AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT);
+
+               pll_cfg = &ar934x_clock_config[i].ddr_pll;
+               pll_nint = pll_cfg->nint[xtal_40];
+               pll_refdiv = pll_cfg->refdiv;
+               ddr_pll =
+                       (pll_nint << AR934X_PLL_DDR_CONFIG_NINT_SHIFT) |
+                       (pll_refdiv << AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) |
+                       (pll_cfg->range << AR934X_PLL_DDR_CONFIG_RANGE_SHIFT) |
+                       (pll_cfg->outdiv << AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT);
+               break;
+       }
+
+       /* PLL configuration not found, hang. */
+       if (i == ARRAY_SIZE(ar934x_clock_config))
+               hang();
+
+       /* Set PLL Bypass */
+       setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
+                    AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS);
+       setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
+                    AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS);
+       setbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
+                    AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS);
+
+       /* Configure CPU PLL */
+       writel(cpu_pll | AR934X_PLL_CPU_CONFIG_PLLPWD,
+              pll_regs + AR934X_PLL_CPU_CONFIG_REG);
+       /* Configure DDR PLL */
+       writel(ddr_pll | AR934X_PLL_DDR_CONFIG_PLLPWD,
+              pll_regs + AR934X_PLL_DDR_CONFIG_REG);
+       /* Configure PLL routing */
+       writel(AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS |
+              AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS |
+              AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS |
+              (0 << AR934X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) |
+              (0 << AR934X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) |
+              (1 << AR934X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) |
+              AR934X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL |
+              AR934X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL |
+              AR934X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL,
+              pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
+
+       /* Configure SRIF PLLs, which is completely undocumented :-) */
+       ar934x_srif_pll_cfg(srif_regs + AR934X_SRIF_CPU_DPLL1_REG, cpu_srif);
+       ar934x_srif_pll_cfg(srif_regs + AR934X_SRIF_DDR_DPLL1_REG, ddr_srif);
+
+       /* Unset PLL Bypass */
+       clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
+                    AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS);
+       clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
+                    AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS);
+       clrbits_be32(pll_regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG,
+                    AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS);
+
+       /* Enable PLL dithering */
+       writel((1 << AR934X_PLL_DDR_DIT_FRAC_STEP_SHIFT) |
+              (0xf << AR934X_PLL_DDR_DIT_UPD_CNT_SHIFT),
+              pll_regs + AR934X_PLL_DDR_DIT_FRAC_REG);
+       writel(48 << AR934X_PLL_CPU_DIT_UPD_CNT_SHIFT,
+              pll_regs + AR934X_PLL_CPU_DIT_FRAC_REG);
+}
+
+static u32 ar934x_get_xtal(void)
+{
+       u32 val;
+
+       val = get_bootstrap();
+       if (val & AR934X_BOOTSTRAP_REF_CLK_40)
+               return 40000000;
+       else
+               return 25000000;
+}
+
+int get_serial_clock(void)
+{
+       return ar934x_get_xtal();
+}
+
+static u32 ar934x_cpupll_to_hz(const u32 regval)
+{
+       const u32 outdiv = (regval >> AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT) &
+                          AR934X_PLL_CPU_CONFIG_OUTDIV_MASK;
+       const u32 refdiv = (regval >> AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT) &
+                          AR934X_PLL_CPU_CONFIG_REFDIV_MASK;
+       const u32 nint = (regval >> AR934X_PLL_CPU_CONFIG_NINT_SHIFT) &
+                          AR934X_PLL_CPU_CONFIG_NINT_MASK;
+       const u32 nfrac = (regval >> AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT) &
+                          AR934X_PLL_CPU_CONFIG_NFRAC_MASK;
+       const u32 xtal = ar934x_get_xtal();
+
+       return (xtal * (nint + (nfrac >> 9))) / (refdiv * (1 << outdiv));
+}
+
+static u32 ar934x_ddrpll_to_hz(const u32 regval)
+{
+       const u32 outdiv = (regval >> AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT) &
+                          AR934X_PLL_DDR_CONFIG_OUTDIV_MASK;
+       const u32 refdiv = (regval >> AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT) &
+                          AR934X_PLL_DDR_CONFIG_REFDIV_MASK;
+       const u32 nint = (regval >> AR934X_PLL_DDR_CONFIG_NINT_SHIFT) &
+                          AR934X_PLL_DDR_CONFIG_NINT_MASK;
+       const u32 nfrac = (regval >> AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT) &
+                          AR934X_PLL_DDR_CONFIG_NFRAC_MASK;
+       const u32 xtal = ar934x_get_xtal();
+
+       return (xtal * (nint + (nfrac >> 9))) / (refdiv * (1 << outdiv));
+}
+
+static void ar934x_update_clock(void)
+{
+       void __iomem *regs;
+       u32 ctrl, cpu, cpupll, ddr, ddrpll;
+       u32 cpudiv, ddrdiv, busdiv;
+       u32 cpuclk, ddrclk, busclk;
+
+       regs = map_physmem(AR71XX_PLL_BASE, AR71XX_PLL_SIZE,
+                          MAP_NOCACHE);
+
+       cpu = readl(regs + AR934X_PLL_CPU_CONFIG_REG);
+       ddr = readl(regs + AR934X_PLL_DDR_CONFIG_REG);
+       ctrl = readl(regs + AR934X_PLL_CPU_DDR_CLK_CTRL_REG);
+
+       cpupll = ar934x_cpupll_to_hz(cpu);
+       ddrpll = ar934x_ddrpll_to_hz(ddr);
+
+       if (ctrl & AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS)
+               cpuclk = ar934x_get_xtal();
+       else if (ctrl & AR934X_PLL_CLK_CTRL_CPUCLK_FROM_CPUPLL)
+               cpuclk = cpupll;
+       else
+               cpuclk = ddrpll;
+
+       if (ctrl & AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS)
+               ddrclk = ar934x_get_xtal();
+       else if (ctrl & AR934X_PLL_CLK_CTRL_DDRCLK_FROM_DDRPLL)
+               ddrclk = ddrpll;
+       else
+               ddrclk = cpupll;
+
+       if (ctrl & AR934X_PLL_CLK_CTRL_AHB_PLL_BYPASS)
+               busclk = ar934x_get_xtal();
+       else if (ctrl & AR934X_PLL_CLK_CTRL_AHBCLK_FROM_DDRPLL)
+               busclk = ddrpll;
+       else
+               busclk = cpupll;
+
+       cpudiv = (ctrl >> AR934X_PLL_CLK_CTRL_CPU_POST_DIV_SHIFT) &
+                AR934X_PLL_CLK_CTRL_CPU_POST_DIV_MASK;
+       ddrdiv = (ctrl >> AR934X_PLL_CLK_CTRL_DDR_POST_DIV_SHIFT) &
+                AR934X_PLL_CLK_CTRL_DDR_POST_DIV_MASK;
+       busdiv = (ctrl >> AR934X_PLL_CLK_CTRL_AHB_POST_DIV_SHIFT) &
+                AR934X_PLL_CLK_CTRL_AHB_POST_DIV_MASK;
+
+       gd->cpu_clk = cpuclk / (cpudiv + 1);
+       gd->mem_clk = ddrclk / (ddrdiv + 1);
+       gd->bus_clk = busclk / (busdiv + 1);
+}
+
+ulong get_bus_freq(ulong dummy)
+{
+       ar934x_update_clock();
+       return gd->bus_clk;
+}
+
+ulong get_ddr_freq(ulong dummy)
+{
+       ar934x_update_clock();
+       return gd->mem_clk;
+}
+
+int do_ar934x_showclk(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+       ar934x_update_clock();
+       printf("CPU:       %8ld MHz\n", gd->cpu_clk / 1000000);
+       printf("Memory:    %8ld MHz\n", gd->mem_clk / 1000000);
+       printf("AHB:       %8ld MHz\n", gd->bus_clk / 1000000);
+       return 0;
+}
+
+U_BOOT_CMD(
+       clocks, CONFIG_SYS_MAXARGS, 1, do_ar934x_showclk,
+       "display clocks",
+       ""
+);
diff --git a/arch/mips/mach-ath79/ar934x/cpu.c b/arch/mips/mach-ath79/ar934x/cpu.c
new file mode 100644 (file)
index 0000000..8fcdf65
--- /dev/null
@@ -0,0 +1,10 @@
+/*
+ * Copyright (C) 2016 Marek Vasut <marex@denx.de>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+
+/* The lowlevel_init() is not needed on AR934x */
+void lowlevel_init(void) {}
diff --git a/arch/mips/mach-ath79/ar934x/ddr.c b/arch/mips/mach-ath79/ar934x/ddr.c
new file mode 100644 (file)
index 0000000..4621d58
--- /dev/null
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2016 Marek Vasut <marex@denx.de>
+ *
+ * Based on RAM init sequence by Piotr Dymacz <pepe2k@gmail.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/addrspace.h>
+#include <asm/types.h>
+#include <mach/ar71xx_regs.h>
+#include <mach/reset.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+enum {
+       AR934X_SDRAM = 0,
+       AR934X_DDR1,
+       AR934X_DDR2,
+};
+
+struct ar934x_mem_config {
+       u32     config1;
+       u32     config2;
+       u32     mode;
+       u32     extmode;
+       u32     tap;
+};
+
+static const struct ar934x_mem_config ar934x_mem_config[] = {
+       [AR934X_SDRAM] = { 0x7fbe8cd0, 0x959f66a8, 0x33, 0, 0x1f1f },
+       [AR934X_DDR1]  = { 0x7fd48cd0, 0x99d0e6a8, 0x33, 0, 0x14 },
+       [AR934X_DDR2]  = { 0xc7d48cd0, 0x9dd0e6a8, 0x33, 0, 0x10012 },
+};
+
+void ar934x_ddr_init(const u16 cpu_mhz, const u16 ddr_mhz, const u16 ahb_mhz)
+{
+       void __iomem *ddr_regs;
+       const struct ar934x_mem_config *memcfg;
+       int memtype;
+       u32 reg, cycle, ctl;
+
+       ddr_regs = map_physmem(AR71XX_DDR_CTRL_BASE, AR71XX_DDR_CTRL_SIZE,
+                              MAP_NOCACHE);
+
+       reg = get_bootstrap();
+       if (reg & AR934X_BOOTSTRAP_SDRAM_DISABLED) {    /* DDR */
+               if (reg & AR934X_BOOTSTRAP_DDR1) {      /* DDR 1 */
+                       memtype = AR934X_DDR1;
+                       cycle = 0xffff;
+               } else {                                /* DDR 2 */
+                       memtype = AR934X_DDR2;
+                       if (gd->arch.rev) {
+                               ctl = BIT(6);   /* Undocumented bit :-( */
+                               if (reg & BIT(3))
+                                       cycle = 0xff;
+                               else
+                                       cycle = 0xffff;
+                       } else {
+                               /* Force DDR2/x16 configuratio on old chips. */
+                               ctl = 0;
+                               cycle = 0xffff;         /* DDR2 16bit */
+                       }
+
+                       writel(0xe59, ddr_regs + AR934X_DDR_REG_DDR2_CONFIG);
+                       udelay(100);
+
+                       writel(0x10, ddr_regs + AR71XX_DDR_REG_CONTROL);
+                       udelay(10);
+
+                       writel(0x20, ddr_regs + AR71XX_DDR_REG_CONTROL);
+                       udelay(10);
+
+                       writel(ctl, ddr_regs + AR934X_DDR_REG_CTL_CONF);
+                       udelay(10);
+               }
+       } else {                                        /* SDRAM */
+               memtype = AR934X_SDRAM;
+               cycle = 0xffffffff;
+
+               writel(0x13b, ddr_regs + AR934X_DDR_REG_CTL_CONF);
+               udelay(100);
+
+               /* Undocumented register */
+               writel(0x13b, ddr_regs + 0x118);
+               udelay(100);
+       }
+
+       memcfg = &ar934x_mem_config[memtype];
+
+       writel(memcfg->config1, ddr_regs + AR71XX_DDR_REG_CONFIG);
+       udelay(100);
+
+       writel(memcfg->config2, ddr_regs + AR71XX_DDR_REG_CONFIG2);
+       udelay(100);
+
+       writel(0x8, ddr_regs + AR71XX_DDR_REG_CONTROL);
+       udelay(10);
+
+       writel(memcfg->mode | 0x100, ddr_regs + AR71XX_DDR_REG_MODE);
+       mdelay(1);
+
+       writel(0x1, ddr_regs + AR71XX_DDR_REG_CONTROL);
+       udelay(10);
+
+       if (memtype == AR934X_DDR2) {
+               writel(memcfg->mode | 0x100, ddr_regs + AR71XX_DDR_REG_EMR);
+               udelay(100);
+
+               writel(0x2, ddr_regs + AR71XX_DDR_REG_CONTROL);
+               udelay(10);
+       }
+
+       if (memtype != AR934X_SDRAM)
+               writel(0x402, ddr_regs + AR71XX_DDR_REG_EMR);
+
+       udelay(100);
+
+       writel(0x2, ddr_regs + AR71XX_DDR_REG_CONTROL);
+       udelay(10);
+
+       writel(0x8, ddr_regs + AR71XX_DDR_REG_CONTROL);
+       udelay(10);
+
+       writel(memcfg->mode, ddr_regs + AR71XX_DDR_REG_MODE);
+       udelay(100);
+
+       writel(0x1, ddr_regs + AR71XX_DDR_REG_CONTROL);
+       udelay(10);
+
+       writel(0x412c /* FIXME */, ddr_regs + AR71XX_DDR_REG_REFRESH);
+       udelay(100);
+
+       writel(memcfg->tap, ddr_regs + AR71XX_DDR_REG_TAP_CTRL0);
+       writel(memcfg->tap, ddr_regs + AR71XX_DDR_REG_TAP_CTRL1);
+
+       if (memtype != AR934X_SDRAM) {
+               if ((gd->arch.rev && (reg & BIT(3))) || !gd->arch.rev) {
+                       writel(memcfg->tap,
+                              ddr_regs + AR934X_DDR_REG_TAP_CTRL2);
+                       writel(memcfg->tap,
+                              ddr_regs + AR934X_DDR_REG_TAP_CTRL3);
+               }
+       }
+
+       writel(cycle, ddr_regs + AR71XX_DDR_REG_RD_CYCLE);
+       udelay(100);
+
+       writel(0x74444444, ddr_regs + AR934X_DDR_REG_BURST);
+       udelay(100);
+
+       writel(0x222, ddr_regs + AR934X_DDR_REG_BURST2);
+       udelay(100);
+
+       writel(0xfffff, ddr_regs + AR934X_DDR_REG_TIMEOUT_MAX);
+       udelay(100);
+}
+
+void ddr_tap_tuning(void)
+{
+}
index a9630c081b7ee1e29590b7322eaf65383dc61e14..a8e51cb4cf4ce24ddb04fcd21c47984db2d50bfa 100644 (file)
 #define AR933X_DDR_REG_TIMEOUT_CNT                     0x9c
 #define AR933X_DDR_REG_TIMEOUT_ADDR                    0x9c
 
+#define AR934X_DDR_REG_TAP_CTRL2                       0x24
+#define AR934X_DDR_REG_TAP_CTRL3                       0x28
 #define AR934X_DDR_REG_FLUSH_GE0                       0x9c
 #define AR934X_DDR_REG_FLUSH_GE1                       0xa0
 #define AR934X_DDR_REG_FLUSH_USB                       0xa4
 #define AR934X_DDR_REG_FLUSH_PCIE                      0xa8
 #define AR934X_DDR_REG_FLUSH_WMAC                      0xac
+#define AR934X_DDR_REG_FLUSH_SRC1                      0xb0
+#define AR934X_DDR_REG_FLUSH_SRC2                      0xb4
+#define AR934X_DDR_REG_DDR2_CONFIG                     0xb8
+#define AR934X_DDR_REG_EMR2                            0xbc
+#define AR934X_DDR_REG_EMR3                            0xc0
+#define AR934X_DDR_REG_BURST                           0xc4
+#define AR934X_DDR_REG_BURST2                          0xc8
+#define AR934X_DDR_REG_TIMEOUT_MAX                     0xcc
+#define AR934X_DDR_REG_CTL_CONF                                0x108
 
 #define QCA953X_DDR_REG_FLUSH_GE0                      0x9c
 #define QCA953X_DDR_REG_FLUSH_GE1                      0xa0
 #define AR934X_PLL_CPU_DDR_CLK_CTRL_REG                        0x08
 #define AR934X_PLL_SWITCH_CLOCK_CONTROL_REG            0x24
 #define AR934X_PLL_ETH_XMII_CONTROL_REG                        0x2c
+#define AR934X_PLL_DDR_DIT_FRAC_REG                    0x44
+#define AR934X_PLL_CPU_DIT_FRAC_REG                    0x48
 
 #define AR934X_PLL_CPU_CONFIG_NFRAC_SHIFT              0
 #define AR934X_PLL_CPU_CONFIG_NFRAC_MASK               0x3f
 #define AR934X_PLL_CPU_CONFIG_NINT_MASK                        0x3f
 #define AR934X_PLL_CPU_CONFIG_REFDIV_SHIFT             12
 #define AR934X_PLL_CPU_CONFIG_REFDIV_MASK              0x1f
+#define AR934X_PLL_CPU_CONFIG_RANGE_SHIFT              17
+#define AR934X_PLL_CPU_CONFIG_RANGE_MASK               0x3
 #define AR934X_PLL_CPU_CONFIG_OUTDIV_SHIFT             19
 #define AR934X_PLL_CPU_CONFIG_OUTDIV_MASK              0x3
+#define AR934X_PLL_CPU_CONFIG_PLLPWD                   BIT(30)
+#define AR934X_PLL_CPU_CONFIG_UPDATING                 BIT(31)
 
 #define AR934X_PLL_DDR_CONFIG_NFRAC_SHIFT              0
 #define AR934X_PLL_DDR_CONFIG_NFRAC_MASK               0x3ff
 #define AR934X_PLL_DDR_CONFIG_NINT_MASK                        0x3f
 #define AR934X_PLL_DDR_CONFIG_REFDIV_SHIFT             16
 #define AR934X_PLL_DDR_CONFIG_REFDIV_MASK              0x1f
+#define AR934X_PLL_DDR_CONFIG_RANGE_SHIFT              21
+#define AR934X_PLL_DDR_CONFIG_RANGE_MASK               0x3
 #define AR934X_PLL_DDR_CONFIG_OUTDIV_SHIFT             23
 #define AR934X_PLL_DDR_CONFIG_OUTDIV_MASK              0x7
+#define AR934X_PLL_DDR_CONFIG_PLLPWD                   BIT(30)
+#define AR934X_PLL_DDR_CONFIG_UPDATING                 BIT(31)
 
 #define AR934X_PLL_CLK_CTRL_CPU_PLL_BYPASS             BIT(2)
 #define AR934X_PLL_CLK_CTRL_DDR_PLL_BYPASS             BIT(3)
 
 #define AR934X_PLL_SWITCH_CLK_CTRL_MDIO_CLK_SEL                BIT(6)
 
+#define AR934X_PLL_DDR_DIT_FRAC_MAX_SHIFT              0
+#define AR934X_PLL_DDR_DIT_FRAC_MAX_MASK               0x3ff
+#define AR934X_PLL_DDR_DIT_FRAC_MIN_SHIFT              10
+#define AR934X_PLL_DDR_DIT_FRAC_MIN_MASK               0x3ff
+#define AR934X_PLL_DDR_DIT_FRAC_STEP_SHIFT             20
+#define AR934X_PLL_DDR_DIT_FRAC_STEP_MASK              0x3f
+#define AR934X_PLL_DDR_DIT_UPD_CNT_SHIFT               27
+#define AR934X_PLL_DDR_DIT_UPD_CNT_MASK                        0x3f
+#define AR934X_PLL_DDR_DIT_DITHER_EN                   BIT(31)
+
+#define AR934X_PLL_CPU_DIT_FRAC_MAX_SHIFT              0
+#define AR934X_PLL_CPU_DIT_FRAC_MAX_MASK               0x3f
+#define AR934X_PLL_CPU_DIT_FRAC_MIN_SHIFT              6
+#define AR934X_PLL_CPU_DIT_FRAC_MIN_MASK               0x3f
+#define AR934X_PLL_CPU_DIT_FRAC_STEP_SHIFT             12
+#define AR934X_PLL_CPU_DIT_FRAC_STEP_MASK              0x3f
+#define AR934X_PLL_CPU_DIT_UPD_CNT_SHIFT               18
+#define AR934X_PLL_CPU_DIT_UPD_CNT_MASK                        0x3f
+#define AR934X_PLL_CPU_DIT_DITHER_EN                   BIT(31)
+
 #define QCA953X_PLL_CPU_CONFIG_REG                     0x00
 #define QCA953X_PLL_DDR_CONFIG_REG                     0x04
 #define QCA953X_PLL_CLK_CTRL_REG                       0x08
 #define AR934X_SRIF_CPU_DPLL1_REG                      0x1c0
 #define AR934X_SRIF_CPU_DPLL2_REG                      0x1c4
 #define AR934X_SRIF_CPU_DPLL3_REG                      0x1c8
+#define AR934X_SRIF_CPU_DPLL4_REG                      0x1cc
 
 #define AR934X_SRIF_DDR_DPLL1_REG                      0x240
 #define AR934X_SRIF_DDR_DPLL2_REG                      0x244
 #define AR934X_SRIF_DDR_DPLL3_REG                      0x248
+#define AR934X_SRIF_DDR_DPLL4_REG                      0x24c
 
 #define AR934X_SRIF_DPLL1_REFDIV_SHIFT                 27
 #define AR934X_SRIF_DPLL1_REFDIV_MASK                  0x1f
index 2c6c1181763ef826275889918dc9448825fddad6..17af08223f740621417c9c8f411c8e88af293435 100644 (file)
@@ -143,4 +143,7 @@ static inline int soc_is_qca956x(void)
 int ath79_eth_reset(void);
 int ath79_usb_reset(void);
 
+void ar934x_pll_init(const u16 cpu_mhz, const u16 ddr_mhz, const u16 ahb_mhz);
+void ar934x_ddr_init(const u16 cpu_mhz, const u16 ddr_mhz, const u16 ahb_mhz);
+
 #endif /* __ASM_MACH_ATH79_H */