MIPS: ralink: add MT7621 support

MT7621 is based on a 1004k core. This patch adds support for the SoC. The
timer and IRQ is just boiler plate as GIC has recently been moved to
generic places in the kernel and just works.

Signed-off-by: John Crispin <blogic@openwrt.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11990/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 226 insertions, 0 deletions

diff --git a/arch/mips/ralink/mt7621.c b/arch/mips/ralink/mt7621.c
new file mode 100644
index 000000000000..e9b9fa3e1e51
--- /dev/null
+++ b/arch/mips/ralink/mt7621.c
@@ -0,0 +1,226 @@
+/*
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 as published
+ * by the Free Software Foundation.
+ *
+ * Copyright (C) 2015 Nikolay Martynov <mar.kolya@gmail.com>
+ * Copyright (C) 2015 John Crispin <blogic@openwrt.org>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <asm/mipsregs.h>
+#include <asm/smp-ops.h>
+#include <asm/mips-cm.h>
+#include <asm/mips-cpc.h>
+#include <asm/mach-ralink/ralink_regs.h>
+#include <asm/mach-ralink/mt7621.h>
+
+#include <pinmux.h>
+
+#include "common.h"
+
+#define SYSC_REG_SYSCFG		0x10
+#define SYSC_REG_CPLL_CLKCFG0	0x2c
+#define SYSC_REG_CUR_CLK_STS	0x44
+#define CPU_CLK_SEL		(BIT(30) | BIT(31))
+
+#define MT7621_GPIO_MODE_UART1		1
+#define MT7621_GPIO_MODE_I2C		2
+#define MT7621_GPIO_MODE_UART3_MASK	0x3
+#define MT7621_GPIO_MODE_UART3_SHIFT	3
+#define MT7621_GPIO_MODE_UART3_GPIO	1
+#define MT7621_GPIO_MODE_UART2_MASK	0x3
+#define MT7621_GPIO_MODE_UART2_SHIFT	5
+#define MT7621_GPIO_MODE_UART2_GPIO	1
+#define MT7621_GPIO_MODE_JTAG		7
+#define MT7621_GPIO_MODE_WDT_MASK	0x3
+#define MT7621_GPIO_MODE_WDT_SHIFT	8
+#define MT7621_GPIO_MODE_WDT_GPIO	1
+#define MT7621_GPIO_MODE_PCIE_RST	0
+#define MT7621_GPIO_MODE_PCIE_REF	2
+#define MT7621_GPIO_MODE_PCIE_MASK	0x3
+#define MT7621_GPIO_MODE_PCIE_SHIFT	10
+#define MT7621_GPIO_MODE_PCIE_GPIO	1
+#define MT7621_GPIO_MODE_MDIO_MASK	0x3
+#define MT7621_GPIO_MODE_MDIO_SHIFT	12
+#define MT7621_GPIO_MODE_MDIO_GPIO	1
+#define MT7621_GPIO_MODE_RGMII1		14
+#define MT7621_GPIO_MODE_RGMII2		15
+#define MT7621_GPIO_MODE_SPI_MASK	0x3
+#define MT7621_GPIO_MODE_SPI_SHIFT	16
+#define MT7621_GPIO_MODE_SPI_GPIO	1
+#define MT7621_GPIO_MODE_SDHCI_MASK	0x3
+#define MT7621_GPIO_MODE_SDHCI_SHIFT	18
+#define MT7621_GPIO_MODE_SDHCI_GPIO	1
+
+static struct rt2880_pmx_func uart1_grp[] =  { FUNC("uart1", 0, 1, 2) };
+static struct rt2880_pmx_func i2c_grp[] =  { FUNC("i2c", 0, 3, 2) };
+static struct rt2880_pmx_func uart3_grp[] = {
+	FUNC("uart3", 0, 5, 4),
+	FUNC("i2s", 2, 5, 4),
+	FUNC("spdif3", 3, 5, 4),
+};
+static struct rt2880_pmx_func uart2_grp[] = {
+	FUNC("uart2", 0, 9, 4),
+	FUNC("pcm", 2, 9, 4),
+	FUNC("spdif2", 3, 9, 4),
+};
+static struct rt2880_pmx_func jtag_grp[] = { FUNC("jtag", 0, 13, 5) };
+static struct rt2880_pmx_func wdt_grp[] = {
+	FUNC("wdt rst", 0, 18, 1),
+	FUNC("wdt refclk", 2, 18, 1),
+};
+static struct rt2880_pmx_func pcie_rst_grp[] = {
+	FUNC("pcie rst", MT7621_GPIO_MODE_PCIE_RST, 19, 1),
+	FUNC("pcie refclk", MT7621_GPIO_MODE_PCIE_REF, 19, 1)
+};
+static struct rt2880_pmx_func mdio_grp[] = { FUNC("mdio", 0, 20, 2) };
+static struct rt2880_pmx_func rgmii2_grp[] = { FUNC("rgmii2", 0, 22, 12) };
+static struct rt2880_pmx_func spi_grp[] = {
+	FUNC("spi", 0, 34, 7),
+	FUNC("nand1", 2, 34, 7),
+};
+static struct rt2880_pmx_func sdhci_grp[] = {
+	FUNC("sdhci", 0, 41, 8),
+	FUNC("nand2", 2, 41, 8),
+};
+static struct rt2880_pmx_func rgmii1_grp[] = { FUNC("rgmii1", 0, 49, 12) };
+
+static struct rt2880_pmx_group mt7621_pinmux_data[] = {
+	GRP("uart1", uart1_grp, 1, MT7621_GPIO_MODE_UART1),
+	GRP("i2c", i2c_grp, 1, MT7621_GPIO_MODE_I2C),
+	GRP_G("uart3", uart3_grp, MT7621_GPIO_MODE_UART3_MASK,
+		MT7621_GPIO_MODE_UART3_GPIO, MT7621_GPIO_MODE_UART3_SHIFT),
+	GRP_G("uart2", uart2_grp, MT7621_GPIO_MODE_UART2_MASK,
+		MT7621_GPIO_MODE_UART2_GPIO, MT7621_GPIO_MODE_UART2_SHIFT),
+	GRP("jtag", jtag_grp, 1, MT7621_GPIO_MODE_JTAG),
+	GRP_G("wdt", wdt_grp, MT7621_GPIO_MODE_WDT_MASK,
+		MT7621_GPIO_MODE_WDT_GPIO, MT7621_GPIO_MODE_WDT_SHIFT),
+	GRP_G("pcie", pcie_rst_grp, MT7621_GPIO_MODE_PCIE_MASK,
+		MT7621_GPIO_MODE_PCIE_GPIO, MT7621_GPIO_MODE_PCIE_SHIFT),
+	GRP_G("mdio", mdio_grp, MT7621_GPIO_MODE_MDIO_MASK,
+		MT7621_GPIO_MODE_MDIO_GPIO, MT7621_GPIO_MODE_MDIO_SHIFT),
+	GRP("rgmii2", rgmii2_grp, 1, MT7621_GPIO_MODE_RGMII2),
+	GRP_G("spi", spi_grp, MT7621_GPIO_MODE_SPI_MASK,
+		MT7621_GPIO_MODE_SPI_GPIO, MT7621_GPIO_MODE_SPI_SHIFT),
+	GRP_G("sdhci", sdhci_grp, MT7621_GPIO_MODE_SDHCI_MASK,
+		MT7621_GPIO_MODE_SDHCI_GPIO, MT7621_GPIO_MODE_SDHCI_SHIFT),
+	GRP("rgmii1", rgmii1_grp, 1, MT7621_GPIO_MODE_RGMII1),
+	{ 0 }
+};
+
+phys_addr_t mips_cpc_default_phys_base(void)
+{
+	panic("Cannot detect cpc address");
+}
+
+void __init ralink_clk_init(void)
+{
+	int cpu_fdiv = 0;
+	int cpu_ffrac = 0;
+	int fbdiv = 0;
+	u32 clk_sts, syscfg;
+	u8 clk_sel = 0, xtal_mode;
+	u32 cpu_clk;
+
+	if ((rt_sysc_r32(SYSC_REG_CPLL_CLKCFG0) & CPU_CLK_SEL) != 0)
+		clk_sel = 1;
+
+	switch (clk_sel) {
+	case 0:
+		clk_sts = rt_sysc_r32(SYSC_REG_CUR_CLK_STS);
+		cpu_fdiv = ((clk_sts >> 8) & 0x1F);
+		cpu_ffrac = (clk_sts & 0x1F);
+		cpu_clk = (500 * cpu_ffrac / cpu_fdiv) * 1000 * 1000;
+		break;
+
+	case 1:
+		fbdiv = ((rt_sysc_r32(0x648) >> 4) & 0x7F) + 1;
+		syscfg = rt_sysc_r32(SYSC_REG_SYSCFG);
+		xtal_mode = (syscfg >> 6) & 0x7;
+		if (xtal_mode >= 6) {
+			/* 25Mhz Xtal */
+			cpu_clk = 25 * fbdiv * 1000 * 1000;
+		} else if (xtal_mode >= 3) {
+			/* 40Mhz Xtal */
+			cpu_clk = 40 * fbdiv * 1000 * 1000;
+		} else {
+			/* 20Mhz Xtal */
+			cpu_clk = 20 * fbdiv * 1000 * 1000;
+		}
+		break;
+	}
+}
+
+void __init ralink_of_remap(void)
+{
+	rt_sysc_membase = plat_of_remap_node("mtk,mt7621-sysc");
+	rt_memc_membase = plat_of_remap_node("mtk,mt7621-memc");
+
+	if (!rt_sysc_membase || !rt_memc_membase)
+		panic("Failed to remap core resources");
+}
+
+void prom_soc_init(struct ralink_soc_info *soc_info)
+{
+	void __iomem *sysc = (void __iomem *) KSEG1ADDR(MT7621_SYSC_BASE);
+	unsigned char *name = NULL;
+	u32 n0;
+	u32 n1;
+	u32 rev;
+
+	n0 = __raw_readl(sysc + SYSC_REG_CHIP_NAME0);
+	n1 = __raw_readl(sysc + SYSC_REG_CHIP_NAME1);
+
+	if (n0 == MT7621_CHIP_NAME0 && n1 == MT7621_CHIP_NAME1) {
+		name = "MT7621";
+		soc_info->compatible = "mtk,mt7621-soc";
+	} else {
+		panic("mt7621: unknown SoC, n0:%08x n1:%08x\n", n0, n1);
+	}
+
+	rev = __raw_readl(sysc + SYSC_REG_CHIP_REV);
+
+	snprintf(soc_info->sys_type, RAMIPS_SYS_TYPE_LEN,
+		"MediaTek %s ver:%u eco:%u",
+		name,
+		(rev >> CHIP_REV_VER_SHIFT) & CHIP_REV_VER_MASK,
+		(rev & CHIP_REV_ECO_MASK));
+
+	soc_info->mem_size_min = MT7621_DDR2_SIZE_MIN;
+	soc_info->mem_size_max = MT7621_DDR2_SIZE_MAX;
+	soc_info->mem_base = MT7621_DRAM_BASE;
+
+	rt2880_pinmux_data = mt7621_pinmux_data;
+
+	/* Early detection of CMP support */
+	mips_cm_probe();
+	mips_cpc_probe();
+
+	if (mips_cm_numiocu()) {
+		/*
+		 * mips_cm_probe() wipes out bootloader
+		 * config for CM regions and we have to configure them
+		 * again. This SoC cannot talk to pamlbus devices
+		 * witout proper iocu region set up.
+		 *
+		 * FIXME: it would be better to do this with values
+		 * from DT, but we need this very early because
+		 * without this we cannot talk to pretty much anything
+		 * including serial.
+		 */
+		write_gcr_reg0_base(MT7621_PALMBUS_BASE);
+		write_gcr_reg0_mask(~MT7621_PALMBUS_SIZE |
+				    CM_GCR_REGn_MASK_CMTGT_IOCU0);
+	}
+
+	if (!register_cps_smp_ops())
+		return;
+	if (!register_cmp_smp_ops())
+		return;
+	if (!register_vsmp_smp_ops())
+		return;
+}