--- /dev/null
+/*
+ * Copyright (C) 2013 Xilinx
+ *
+ * Based on "Generic on-chip SRAM allocation driver"
+ *
+ * Copyright (C) 2012 Philipp Zabel, Pengutronix
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/of_irq.h>
+#include <linux/platform_device.h>
+#include <linux/genalloc.h>
+
+#include "common.h"
+
+#define ZYNQ_OCM_HIGHADDR 0xfffc0000
+#define ZYNQ_OCM_LOWADDR 0x0
+#define ZYNQ_OCM_BLOCK_SIZE 0x10000
+#define ZYNQ_OCM_BLOCKS 4
+#define ZYNQ_OCM_GRANULARITY 32
+
+#define ZYNQ_OCM_PARITY_CTRL 0x0
+#define ZYNQ_OCM_PARITY_ENABLE 0x1e
+
+#define ZYNQ_OCM_PARITY_ERRADDRESS 0x4
+
+#define ZYNQ_OCM_IRQ_STS 0x8
+#define ZYNQ_OCM_IRQ_STS_ERR_MASK 0x7
+
+struct zynq_ocm_dev {
+ void __iomem *base;
+ int irq;
+ struct gen_pool *pool;
+ struct resource res[ZYNQ_OCM_BLOCKS];
+};
+
+/**
+ * zynq_ocm_irq_handler - Interrupt service routine of the OCM controller
+ * @irq: IRQ number
+ * @data: Pointer to the zynq_ocm_dev structure
+ *
+ * Return: IRQ_HANDLED when handled; IRQ_NONE otherwise.
+ */
+static irqreturn_t zynq_ocm_irq_handler(int irq, void *data)
+{
+ u32 sts;
+ u32 err_addr;
+ struct zynq_ocm_dev *zynq_ocm = data;
+
+ /* check status */
+ sts = readl(zynq_ocm->base + ZYNQ_OCM_IRQ_STS);
+ if (sts & ZYNQ_OCM_IRQ_STS_ERR_MASK) {
+ /* check error address */
+ err_addr = readl(zynq_ocm->base + ZYNQ_OCM_PARITY_ERRADDRESS);
+ pr_err("%s: OCM err intr generated at 0x%04x (stat: 0x%08x).",
+ __func__, err_addr, sts & ZYNQ_OCM_IRQ_STS_ERR_MASK);
+ return IRQ_HANDLED;
+ }
+ pr_warn("%s: Interrupt generated by OCM, but no error is found.",
+ __func__);
+
+ return IRQ_NONE;
+}
+
+/**
+ * zynq_ocm_probe - Probe method for the OCM driver
+ * @pdev: Pointer to the platform_device structure
+ *
+ * This function initializes the driver data structures and the hardware.
+ *
+ * Return: 0 on success and error value on failure
+ */
+static int zynq_ocm_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct zynq_ocm_dev *zynq_ocm;
+ u32 i, ocm_config, curr;
+ struct resource *res;
+
+ ocm_config = zynq_slcr_get_ocm_config();
+
+ zynq_ocm = devm_kzalloc(&pdev->dev, sizeof(*zynq_ocm), GFP_KERNEL);
+ if (!zynq_ocm)
+ return -ENOMEM;
+
+ zynq_ocm->pool = devm_gen_pool_create(&pdev->dev,
+ ilog2(ZYNQ_OCM_GRANULARITY),
+ NUMA_NO_NODE, NULL);
+ if (!zynq_ocm->pool)
+ return -ENOMEM;
+
+ curr = 0; /* For storing current struct resource for OCM */
+ for (i = 0; i < ZYNQ_OCM_BLOCKS; i++) {
+ u32 base, start, end;
+
+ /* Setup base address for 64kB OCM block */
+ if (ocm_config & BIT(i))
+ base = ZYNQ_OCM_HIGHADDR;
+ else
+ base = ZYNQ_OCM_LOWADDR;
+
+ /* Calculate start and end block addresses */
+ start = i * ZYNQ_OCM_BLOCK_SIZE + base;
+ end = start + (ZYNQ_OCM_BLOCK_SIZE - 1);
+
+ /* Concatenate OCM blocks together to get bigger pool */
+ if (i > 0 && start == (zynq_ocm->res[curr - 1].end + 1)) {
+ zynq_ocm->res[curr - 1].end = end;
+ } else {
+#ifdef CONFIG_SMP
+ /*
+ * OCM block if placed at 0x0 has special meaning
+ * for SMP because jump trampoline is added there.
+ * Ensure that this address won't be allocated.
+ */
+ if (!base) {
+ u32 trampoline_code_size =
+ &zynq_secondary_trampoline_end -
+ &zynq_secondary_trampoline;
+ dev_dbg(&pdev->dev,
+ "Allocate reset vector table %dB\n",
+ trampoline_code_size);
+ /* postpone start offset */
+ start += trampoline_code_size;
+ }
+#endif
+ /* First resource is always initialized */
+ zynq_ocm->res[curr].start = start;
+ zynq_ocm->res[curr].end = end;
+ zynq_ocm->res[curr].flags = IORESOURCE_MEM;
+ curr++; /* Increment curr value */
+ }
+ dev_dbg(&pdev->dev, "OCM block %d, start %x, end %x\n",
+ i, start, end);
+ }
+
+ /*
+ * Separate pool allocation from OCM block detection to ensure
+ * the biggest possible pool.
+ */
+ for (i = 0; i < ZYNQ_OCM_BLOCKS; i++) {
+ unsigned long size;
+ void __iomem *virt_base;
+
+ /* Skip all zero size resources */
+ if (zynq_ocm->res[i].end == 0)
+ break;
+ dev_dbg(&pdev->dev, "OCM resources %d, start %x, end %x\n",
+ i, zynq_ocm->res[i].start, zynq_ocm->res[i].end);
+ size = resource_size(&zynq_ocm->res[i]);
+ virt_base = devm_ioremap_resource(&pdev->dev,
+ &zynq_ocm->res[i]);
+ if (IS_ERR(virt_base))
+ return PTR_ERR(virt_base);
+
+ ret = gen_pool_add_virt(zynq_ocm->pool,
+ (unsigned long)virt_base,
+ zynq_ocm->res[i].start, size, -1);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Gen pool failed\n");
+ return ret;
+ }
+ dev_info(&pdev->dev, "ZYNQ OCM pool: %ld KiB @ 0x%p\n",
+ size / 1024, virt_base);
+ }
+
+ /* Get OCM config space */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ zynq_ocm->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(zynq_ocm->base))
+ return PTR_ERR(zynq_ocm->base);
+
+ /* Allocate OCM parity IRQ */
+ zynq_ocm->irq = platform_get_irq(pdev, 0);
+ if (zynq_ocm->irq < 0) {
+ dev_err(&pdev->dev, "irq resource not found\n");
+ return zynq_ocm->irq;
+ }
+ ret = devm_request_irq(&pdev->dev, zynq_ocm->irq, zynq_ocm_irq_handler,
+ 0, pdev->name, zynq_ocm);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "request_irq failed\n");
+ return ret;
+ }
+
+ /* Enable parity errors */
+ writel(ZYNQ_OCM_PARITY_ENABLE, zynq_ocm->base + ZYNQ_OCM_PARITY_CTRL);
+
+ platform_set_drvdata(pdev, zynq_ocm);
+
+ return 0;
+}
+
+/**
+ * zynq_ocm_remove - Remove method for the OCM driver
+ * @pdev: Pointer to the platform_device structure
+ *
+ * This function is called if a device is physically removed from the system or
+ * if the driver module is being unloaded. It frees all resources allocated to
+ * the device.
+ *
+ * Return: 0 on success and error value on failure
+ */
+static int zynq_ocm_remove(struct platform_device *pdev)
+{
+ struct zynq_ocm_dev *zynq_ocm = platform_get_drvdata(pdev);
+
+ if (gen_pool_avail(zynq_ocm->pool) < gen_pool_size(zynq_ocm->pool))
+ dev_dbg(&pdev->dev, "removed while SRAM allocated\n");
+
+ return 0;
+}
+
+static struct of_device_id zynq_ocm_dt_ids[] = {
+ { .compatible = "xlnx,zynq-ocmc-1.0" },
+ { /* end of table */ }
+};
+
+static struct platform_driver zynq_ocm_driver = {
+ .driver = {
+ .name = "zynq-ocm",
+ .of_match_table = zynq_ocm_dt_ids,
+ },
+ .probe = zynq_ocm_probe,
+ .remove = zynq_ocm_remove,
+};
+
+static int __init zynq_ocm_init(void)
+{
+ return platform_driver_register(&zynq_ocm_driver);
+}
+
+arch_initcall(zynq_ocm_init);
projects / zynq / linux.git / commitdiff