1 files changed, 208 insertions, 0 deletions

diff --git a/arch/mips/lantiq/xway/gptu.c b/arch/mips/lantiq/xway/gptu.c
new file mode 100644
index 000000000..200fe9ff6
--- /dev/null
+++ b/arch/mips/lantiq/xway/gptu.c
@@ -0,0 +1,208 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *
+ *  Copyright (C) 2012 John Crispin <john@phrozen.org>
+ *  Copyright (C) 2012 Lantiq GmbH
+ */
+
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/init.h>
+#include <linux/of_platform.h>
+#include <linux/of_irq.h>
+
+#include <lantiq_soc.h>
+#include "../clk.h"
+
+/* the magic ID byte of the core */
+#define GPTU_MAGIC      0x59
+/* clock control register */
+#define GPTU_CLC        0x00
+/* id register */
+#define GPTU_ID         0x08
+/* interrupt node enable */
+#define GPTU_IRNEN      0xf4
+/* interrupt control register */
+#define GPTU_IRCR       0xf8
+/* interrupt capture register */
+#define GPTU_IRNCR      0xfc
+/* there are 3 identical blocks of 2 timers. calculate register offsets */
+#define GPTU_SHIFT(x)   (x % 2 ? 4 : 0)
+#define GPTU_BASE(x)    (((x >> 1) * 0x20) + 0x10)
+/* timer control register */
+#define GPTU_CON(x)     (GPTU_BASE(x) + GPTU_SHIFT(x) + 0x00)
+/* timer auto reload register */
+#define GPTU_RUN(x)     (GPTU_BASE(x) + GPTU_SHIFT(x) + 0x08)
+/* timer manual reload register */
+#define GPTU_RLD(x)     (GPTU_BASE(x) + GPTU_SHIFT(x) + 0x10)
+/* timer count register */
+#define GPTU_CNT(x)     (GPTU_BASE(x) + GPTU_SHIFT(x) + 0x18)
+
+/* GPTU_CON(x) */
+#define CON_CNT         BIT(2)
+#define CON_EDGE_ANY    (BIT(7) | BIT(6))
+#define CON_SYNC        BIT(8)
+#define CON_CLK_INT     BIT(10)
+
+/* GPTU_RUN(x) */
+#define RUN_SEN         BIT(0)
+#define RUN_RL          BIT(2)
+
+/* set clock to runmode */
+#define CLC_RMC         BIT(8)
+/* bring core out of suspend */
+#define CLC_SUSPEND     BIT(4)
+/* the disable bit */
+#define CLC_DISABLE     BIT(0)
+
+#define gptu_w32(x, y)  ltq_w32((x), gptu_membase + (y))
+#define gptu_r32(x)     ltq_r32(gptu_membase + (x))
+
+enum gptu_timer {
+        TIMER1A = 0,
+        TIMER1B,
+        TIMER2A,
+        TIMER2B,
+        TIMER3A,
+        TIMER3B
+};
+
+static void __iomem *gptu_membase;
+static struct resource irqres[6];
+
+static irqreturn_t timer_irq_handler(int irq, void *priv)
+{
+        int timer = irq - irqres[0].start;
+        gptu_w32(1 << timer, GPTU_IRNCR);
+        return IRQ_HANDLED;
+}
+
+static void gptu_hwinit(void)
+{
+        gptu_w32(0x00, GPTU_IRNEN);
+        gptu_w32(0xff, GPTU_IRNCR);
+        gptu_w32(CLC_RMC | CLC_SUSPEND, GPTU_CLC);
+}
+
+static void gptu_hwexit(void)
+{
+        gptu_w32(0x00, GPTU_IRNEN);
+        gptu_w32(0xff, GPTU_IRNCR);
+        gptu_w32(CLC_DISABLE, GPTU_CLC);
+}
+
+static int gptu_enable(struct clk *clk)
+{
+        int ret = request_irq(irqres[clk->bits].start, timer_irq_handler,
+                IRQF_TIMER, "gtpu", NULL);
+        if (ret) {
+                pr_err("gptu: failed to request irq\n");
+                return ret;
+        }
+
+        gptu_w32(CON_CNT | CON_EDGE_ANY | CON_SYNC | CON_CLK_INT,
+                GPTU_CON(clk->bits));
+        gptu_w32(1, GPTU_RLD(clk->bits));
+        gptu_w32(gptu_r32(GPTU_IRNEN) | BIT(clk->bits), GPTU_IRNEN);
+        gptu_w32(RUN_SEN | RUN_RL, GPTU_RUN(clk->bits));
+        return 0;
+}
+
+static void gptu_disable(struct clk *clk)
+{
+        gptu_w32(0, GPTU_RUN(clk->bits));
+        gptu_w32(0, GPTU_CON(clk->bits));
+        gptu_w32(0, GPTU_RLD(clk->bits));
+        gptu_w32(gptu_r32(GPTU_IRNEN) & ~BIT(clk->bits), GPTU_IRNEN);
+        free_irq(irqres[clk->bits].start, NULL);
+}
+
+static inline void clkdev_add_gptu(struct device *dev, const char *con,
+                                                        unsigned int timer)
+{
+        struct clk *clk = kzalloc(sizeof(struct clk), GFP_KERNEL);
+
+        if (!clk)
+                return;
+        clk->cl.dev_id = dev_name(dev);
+        clk->cl.con_id = con;
+        clk->cl.clk = clk;
+        clk->enable = gptu_enable;
+        clk->disable = gptu_disable;
+        clk->bits = timer;
+        clkdev_add(&clk->cl);
+}
+
+static int gptu_probe(struct platform_device *pdev)
+{
+        struct clk *clk;
+        struct resource *res;
+
+        if (of_irq_to_resource_table(pdev->dev.of_node, irqres, 6) != 6) {
+                dev_err(&pdev->dev, "Failed to get IRQ list\n");
+                return -EINVAL;
+        }
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        /* remap gptu register range */
+        gptu_membase = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(gptu_membase))
+                return PTR_ERR(gptu_membase);
+
+        /* enable our clock */
+        clk = clk_get(&pdev->dev, NULL);
+        if (IS_ERR(clk)) {
+                dev_err(&pdev->dev, "Failed to get clock\n");
+                return -ENOENT;
+        }
+        clk_enable(clk);
+
+        /* power up the core */
+        gptu_hwinit();
+
+        /* the gptu has a ID register */
+        if (((gptu_r32(GPTU_ID) >> 8) & 0xff) != GPTU_MAGIC) {
+                dev_err(&pdev->dev, "Failed to find magic\n");
+                gptu_hwexit();
+                clk_disable(clk);
+                clk_put(clk);
+                return -ENAVAIL;
+        }
+
+        /* register the clocks */
+        clkdev_add_gptu(&pdev->dev, "timer1a", TIMER1A);
+        clkdev_add_gptu(&pdev->dev, "timer1b", TIMER1B);
+        clkdev_add_gptu(&pdev->dev, "timer2a", TIMER2A);
+        clkdev_add_gptu(&pdev->dev, "timer2b", TIMER2B);
+        clkdev_add_gptu(&pdev->dev, "timer3a", TIMER3A);
+        clkdev_add_gptu(&pdev->dev, "timer3b", TIMER3B);
+
+        dev_info(&pdev->dev, "gptu: 6 timers loaded\n");
+
+        return 0;
+}
+
+static const struct of_device_id gptu_match[] = {
+        { .compatible = "lantiq,gptu-xway" },
+        {},
+};
+
+static struct platform_driver dma_driver = {
+        .probe = gptu_probe,
+        .driver = {
+                .name = "gptu-xway",
+                .of_match_table = gptu_match,
+        },
+};
+
+int __init gptu_init(void)
+{
+        int ret = platform_driver_register(&dma_driver);
+
+        if (ret)
+                pr_info("gptu: Error registering platform driver\n");
+        return ret;
+}
+
+arch_initcall(gptu_init);