1 files changed, 481 insertions, 0 deletions
diff --git a/arch/arm/mach-mxs/mach-mxs.c b/arch/arm/mach-mxs/mach-mxs.c
new file mode 100644
index 000000000..1c57ac401
--- /dev/null
+++ b/arch/arm/mach-mxs/mach-mxs.c
@@ -0,0 +1,481 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright 2012 Freescale Semiconductor, Inc.
+ * Copyright 2012 Linaro Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/clk/mxs.h>
+#include <linux/clkdev.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/init.h>
+#include <linux/irqchip/mxs.h>
+#include <linux/reboot.h>
+#include <linux/micrel_phy.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/phy.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/sys_soc.h>
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+#include <asm/mach/time.h>
+#include <asm/system_info.h>
+#include <asm/system_misc.h>
+
+#include "pm.h"
+
+/* MXS DIGCTL SAIF CLKMUX */
+#define MXS_DIGCTL_SAIF_CLKMUX_DIRECT		0x0
+#define MXS_DIGCTL_SAIF_CLKMUX_CROSSINPUT	0x1
+#define MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0		0x2
+#define MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR1		0x3
+
+#define HW_DIGCTL_CHIPID	0x310
+#define HW_DIGCTL_CHIPID_MASK	(0xffff << 16)
+#define HW_DIGCTL_REV_MASK	0xff
+#define HW_DIGCTL_CHIPID_MX23	(0x3780 << 16)
+#define HW_DIGCTL_CHIPID_MX28	(0x2800 << 16)
+
+#define MXS_CHIP_REVISION_1_0	0x10
+#define MXS_CHIP_REVISION_1_1	0x11
+#define MXS_CHIP_REVISION_1_2	0x12
+#define MXS_CHIP_REVISION_1_3	0x13
+#define MXS_CHIP_REVISION_1_4	0x14
+#define MXS_CHIP_REV_UNKNOWN	0xff
+
+#define MXS_GPIO_NR(bank, nr)	((bank) * 32 + (nr))
+
+#define MXS_SET_ADDR		0x4
+#define MXS_CLR_ADDR		0x8
+#define MXS_TOG_ADDR		0xc
+
+#define HW_OCOTP_OPS2		19	/* offset 0x150 */
+#define HW_OCOTP_OPS3		20	/* offset 0x160 */
+
+static u32 chipid;
+static u32 socid;
+
+static void __iomem *reset_addr;
+
+static inline void __mxs_setl(u32 mask, void __iomem *reg)
+{
+	__raw_writel(mask, reg + MXS_SET_ADDR);
+}
+
+static inline void __mxs_clrl(u32 mask, void __iomem *reg)
+{
+	__raw_writel(mask, reg + MXS_CLR_ADDR);
+}
+
+static inline void __mxs_togl(u32 mask, void __iomem *reg)
+{
+	__raw_writel(mask, reg + MXS_TOG_ADDR);
+}
+
+#define OCOTP_WORD_OFFSET		0x20
+#define OCOTP_WORD_COUNT		0x20
+
+#define BM_OCOTP_CTRL_BUSY		(1 << 8)
+#define BM_OCOTP_CTRL_ERROR		(1 << 9)
+#define BM_OCOTP_CTRL_RD_BANK_OPEN	(1 << 12)
+
+static DEFINE_MUTEX(ocotp_mutex);
+static u32 ocotp_words[OCOTP_WORD_COUNT];
+
+static const u32 *mxs_get_ocotp(void)
+{
+	struct device_node *np;
+	void __iomem *ocotp_base;
+	int timeout = 0x400;
+	size_t i;
+	static int once;
+
+	if (once)
+		return ocotp_words;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,ocotp");
+	ocotp_base = of_iomap(np, 0);
+	WARN_ON(!ocotp_base);
+
+	mutex_lock(&ocotp_mutex);
+
+	/*
+	 * clk_enable(hbus_clk) for ocotp can be skipped
+	 * as it must be on when system is running.
+	 */
+
+	/* try to clear ERROR bit */
+	__mxs_clrl(BM_OCOTP_CTRL_ERROR, ocotp_base);
+
+	/* check both BUSY and ERROR cleared */
+	while ((__raw_readl(ocotp_base) &
+		(BM_OCOTP_CTRL_BUSY | BM_OCOTP_CTRL_ERROR)) && --timeout)
+		cpu_relax();
+
+	if (unlikely(!timeout))
+		goto error_unlock;
+
+	/* open OCOTP banks for read */
+	__mxs_setl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base);
+
+	/* approximately wait 32 hclk cycles */
+	udelay(1);
+
+	/* poll BUSY bit becoming cleared */
+	timeout = 0x400;
+	while ((__raw_readl(ocotp_base) & BM_OCOTP_CTRL_BUSY) && --timeout)
+		cpu_relax();
+
+	if (unlikely(!timeout))
+		goto error_unlock;
+
+	for (i = 0; i < OCOTP_WORD_COUNT; i++)
+		ocotp_words[i] = __raw_readl(ocotp_base + OCOTP_WORD_OFFSET +
+						i * 0x10);
+
+	/* close banks for power saving */
+	__mxs_clrl(BM_OCOTP_CTRL_RD_BANK_OPEN, ocotp_base);
+
+	once = 1;
+
+	mutex_unlock(&ocotp_mutex);
+
+	return ocotp_words;
+
+error_unlock:
+	mutex_unlock(&ocotp_mutex);
+	pr_err("%s: timeout in reading OCOTP\n", __func__);
+	return NULL;
+}
+
+enum mac_oui {
+	OUI_FSL,
+	OUI_DENX,
+	OUI_CRYSTALFONTZ,
+	OUI_I2SE,
+	OUI_ARMADEUS,
+};
+
+static void __init update_fec_mac_prop(enum mac_oui oui)
+{
+	struct device_node *np, *from = NULL;
+	struct property *newmac;
+	const u32 *ocotp = mxs_get_ocotp();
+	u8 *macaddr;
+	u32 val;
+	int i;
+
+	for (i = 0; i < 2; i++) {
+		np = of_find_compatible_node(from, NULL, "fsl,imx28-fec");
+		if (!np)
+			return;
+
+		from = np;
+
+		if (of_get_property(np, "local-mac-address", NULL))
+			continue;
+
+		newmac = kzalloc(sizeof(*newmac) + 6, GFP_KERNEL);
+		if (!newmac)
+			return;
+		newmac->value = newmac + 1;
+		newmac->length = 6;
+
+		newmac->name = kstrdup("local-mac-address", GFP_KERNEL);
+		if (!newmac->name) {
+			kfree(newmac);
+			return;
+		}
+
+		/*
+		 * OCOTP only stores the last 4 octets for each mac address,
+		 * so hard-code OUI here.
+		 */
+		macaddr = newmac->value;
+		switch (oui) {
+		case OUI_FSL:
+			macaddr[0] = 0x00;
+			macaddr[1] = 0x04;
+			macaddr[2] = 0x9f;
+			break;
+		case OUI_DENX:
+			macaddr[0] = 0xc0;
+			macaddr[1] = 0xe5;
+			macaddr[2] = 0x4e;
+			break;
+		case OUI_CRYSTALFONTZ:
+			macaddr[0] = 0x58;
+			macaddr[1] = 0xb9;
+			macaddr[2] = 0xe1;
+			break;
+		case OUI_I2SE:
+			macaddr[0] = 0x00;
+			macaddr[1] = 0x01;
+			macaddr[2] = 0x87;
+			break;
+		case OUI_ARMADEUS:
+			macaddr[0] = 0x00;
+			macaddr[1] = 0x1e;
+			macaddr[2] = 0xac;
+			break;
+		}
+		val = ocotp[i];
+		macaddr[3] = (val >> 16) & 0xff;
+		macaddr[4] = (val >> 8) & 0xff;
+		macaddr[5] = (val >> 0) & 0xff;
+
+		of_update_property(np, newmac);
+	}
+}
+
+static inline void enable_clk_enet_out(void)
+{
+	struct clk *clk = clk_get_sys("enet_out", NULL);
+
+	if (!IS_ERR(clk))
+		clk_prepare_enable(clk);
+}
+
+static void __init imx28_evk_init(void)
+{
+	update_fec_mac_prop(OUI_FSL);
+
+	mxs_saif_clkmux_select(MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0);
+}
+
+static void __init imx28_apf28_init(void)
+{
+	update_fec_mac_prop(OUI_ARMADEUS);
+}
+
+static int apx4devkit_phy_fixup(struct phy_device *phy)
+{
+	phy->dev_flags |= MICREL_PHY_50MHZ_CLK;
+	return 0;
+}
+
+static void __init apx4devkit_init(void)
+{
+	enable_clk_enet_out();
+
+	if (IS_BUILTIN(CONFIG_PHYLIB))
+		phy_register_fixup_for_uid(PHY_ID_KSZ8051, MICREL_PHY_ID_MASK,
+					   apx4devkit_phy_fixup);
+}
+
+static void __init crystalfontz_init(void)
+{
+	update_fec_mac_prop(OUI_CRYSTALFONTZ);
+}
+
+static void __init duckbill_init(void)
+{
+	update_fec_mac_prop(OUI_I2SE);
+}
+
+static void __init m28cu3_init(void)
+{
+	update_fec_mac_prop(OUI_DENX);
+}
+
+static const char __init *mxs_get_soc_id(void)
+{
+	struct device_node *np;
+	void __iomem *digctl_base;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,imx23-digctl");
+	digctl_base = of_iomap(np, 0);
+	WARN_ON(!digctl_base);
+
+	chipid = readl(digctl_base + HW_DIGCTL_CHIPID);
+	socid = chipid & HW_DIGCTL_CHIPID_MASK;
+
+	iounmap(digctl_base);
+	of_node_put(np);
+
+	switch (socid) {
+	case HW_DIGCTL_CHIPID_MX23:
+		return "i.MX23";
+	case HW_DIGCTL_CHIPID_MX28:
+		return "i.MX28";
+	default:
+		return "Unknown";
+	}
+}
+
+static u32 __init mxs_get_cpu_rev(void)
+{
+	u32 rev = chipid & HW_DIGCTL_REV_MASK;
+
+	switch (socid) {
+	case HW_DIGCTL_CHIPID_MX23:
+		switch (rev) {
+		case 0x0:
+			return MXS_CHIP_REVISION_1_0;
+		case 0x1:
+			return MXS_CHIP_REVISION_1_1;
+		case 0x2:
+			return MXS_CHIP_REVISION_1_2;
+		case 0x3:
+			return MXS_CHIP_REVISION_1_3;
+		case 0x4:
+			return MXS_CHIP_REVISION_1_4;
+		default:
+			return MXS_CHIP_REV_UNKNOWN;
+		}
+	case HW_DIGCTL_CHIPID_MX28:
+		switch (rev) {
+		case 0x0:
+			return MXS_CHIP_REVISION_1_1;
+		case 0x1:
+			return MXS_CHIP_REVISION_1_2;
+		default:
+			return MXS_CHIP_REV_UNKNOWN;
+		}
+	default:
+		return MXS_CHIP_REV_UNKNOWN;
+	}
+}
+
+static const char __init *mxs_get_revision(void)
+{
+	u32 rev = mxs_get_cpu_rev();
+
+	if (rev != MXS_CHIP_REV_UNKNOWN)
+		return kasprintf(GFP_KERNEL, "%d.%d", (rev >> 4) & 0xf,
+				rev & 0xf);
+	else
+		return kasprintf(GFP_KERNEL, "%s", "Unknown");
+}
+
+#define MX23_CLKCTRL_RESET_OFFSET	0x120
+#define MX28_CLKCTRL_RESET_OFFSET	0x1e0
+
+static int __init mxs_restart_init(void)
+{
+	struct device_node *np;
+
+	np = of_find_compatible_node(NULL, NULL, "fsl,clkctrl");
+	reset_addr = of_iomap(np, 0);
+	if (!reset_addr)
+		return -ENODEV;
+
+	if (of_device_is_compatible(np, "fsl,imx23-clkctrl"))
+		reset_addr += MX23_CLKCTRL_RESET_OFFSET;
+	else
+		reset_addr += MX28_CLKCTRL_RESET_OFFSET;
+	of_node_put(np);
+
+	return 0;
+}
+
+static void __init eukrea_mbmx283lc_init(void)
+{
+	mxs_saif_clkmux_select(MXS_DIGCTL_SAIF_CLKMUX_EXTMSTR0);
+}
+
+static void __init mxs_machine_init(void)
+{
+	struct device_node *root;
+	struct device *parent;
+	struct soc_device *soc_dev;
+	struct soc_device_attribute *soc_dev_attr;
+	u64 soc_uid = 0;
+	const u32 *ocotp = mxs_get_ocotp();
+	int ret;
+
+	soc_dev_attr = kzalloc(sizeof(*soc_dev_attr), GFP_KERNEL);
+	if (!soc_dev_attr)
+		return;
+
+	root = of_find_node_by_path("/");
+	ret = of_property_read_string(root, "model", &soc_dev_attr->machine);
+	if (ret) {
+		kfree(soc_dev_attr);
+		return;
+	}
+
+	soc_dev_attr->family = "Freescale MXS Family";
+	soc_dev_attr->soc_id = mxs_get_soc_id();
+	soc_dev_attr->revision = mxs_get_revision();
+
+	if (socid == HW_DIGCTL_CHIPID_MX23) {
+		soc_uid = system_serial_low = ocotp[HW_OCOTP_OPS3];
+	} else if (socid == HW_DIGCTL_CHIPID_MX28) {
+		soc_uid = system_serial_high = ocotp[HW_OCOTP_OPS2];
+		soc_uid <<= 32;
+		system_serial_low = ocotp[HW_OCOTP_OPS3];
+		soc_uid |= system_serial_low;
+	}
+
+	if (soc_uid)
+		soc_dev_attr->serial_number = kasprintf(GFP_KERNEL, "%016llX", soc_uid);
+
+	soc_dev = soc_device_register(soc_dev_attr);
+	if (IS_ERR(soc_dev)) {
+		kfree(soc_dev_attr->serial_number);
+		kfree(soc_dev_attr->revision);
+		kfree(soc_dev_attr);
+		return;
+	}
+
+	parent = soc_device_to_device(soc_dev);
+
+	if (of_machine_is_compatible("fsl,imx28-evk"))
+		imx28_evk_init();
+	if (of_machine_is_compatible("armadeus,imx28-apf28"))
+		imx28_apf28_init();
+	else if (of_machine_is_compatible("bluegiga,apx4devkit"))
+		apx4devkit_init();
+	else if (of_machine_is_compatible("crystalfontz,cfa10036"))
+		crystalfontz_init();
+	else if (of_machine_is_compatible("eukrea,mbmx283lc"))
+		eukrea_mbmx283lc_init();
+	else if (of_machine_is_compatible("i2se,duckbill") ||
+		 of_machine_is_compatible("i2se,duckbill-2"))
+		duckbill_init();
+	else if (of_machine_is_compatible("msr,m28cu3"))
+		m28cu3_init();
+
+	of_platform_default_populate(NULL, NULL, parent);
+
+	mxs_restart_init();
+}
+
+#define MXS_CLKCTRL_RESET_CHIP		(1 << 1)
+
+/*
+ * Reset the system. It is called by machine_restart().
+ */
+static void mxs_restart(enum reboot_mode mode, const char *cmd)
+{
+	if (reset_addr) {
+		/* reset the chip */
+		__mxs_setl(MXS_CLKCTRL_RESET_CHIP, reset_addr);
+
+		pr_err("Failed to assert the chip reset\n");
+
+		/* Delay to allow the serial port to show the message */
+		mdelay(50);
+	}
+
+	/* We'll take a jump through zero as a poor second */
+	soft_restart(0);
+}
+
+static const char *const mxs_dt_compat[] __initconst = {
+	"fsl,imx28",
+	"fsl,imx23",
+	NULL,
+};
+
+DT_MACHINE_START(MXS, "Freescale MXS (Device Tree)")
+	.handle_irq	= icoll_handle_irq,
+	.init_machine	= mxs_machine_init,
+	.init_late      = mxs_pm_init,
+	.dt_compat	= mxs_dt_compat,
+	.restart	= mxs_restart,
+MACHINE_END