[v4,01/18] remoteproc: st_xp70_rproc: add a xp70 slimcore rproc driver

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 72e97d7..9e48fd1 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -86,4 +86,12 @@  config ST_REMOTEPROC
 	  processor framework.
 	  This can be either built-in or a loadable module.
 
+config ST_XP70_REMOTEPROC
+	tristate "XP70 slim remoteproc support"
+	depends on ARCH_STI
+	select REMOTEPROC
+	help
+	  Say y here to support xp70 slim core.
+	  If unsure say N.
+
 endmenu
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 279cb2e..b5dab8e 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -12,3 +12,4 @@  obj-$(CONFIG_STE_MODEM_RPROC)	 	+= ste_modem_rproc.o
 obj-$(CONFIG_WKUP_M3_RPROC)		+= wkup_m3_rproc.o
 obj-$(CONFIG_DA8XX_REMOTEPROC)		+= da8xx_remoteproc.o
 obj-$(CONFIG_ST_REMOTEPROC)		+= st_remoteproc.o
+obj-$(CONFIG_ST_XP70_REMOTEPROC)	+= st_xp70_rproc.o
diff --git a/drivers/remoteproc/st_xp70_rproc.c b/drivers/remoteproc/st_xp70_rproc.c
new file mode 100644
index 0000000..6a78e7c
--- /dev/null
+++ b/drivers/remoteproc/st_xp70_rproc.c
@@ -0,0 +1,380 @@ 
+/*
+ * st_xp70_rproc.c
+ *
+ * Copyright (C) 2016 STMicroelectronics
+ * Author: Peter Griffin <peter.griffin@st.com>
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+
+#include <linux/clk.h>
+#include <linux/elf.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+#include <linux/remoteproc/st_xp70_rproc.h>
+#include "remoteproc_internal.h"
+
+/* slimcore registers */
+#define XP70_ID_OFST		0x0
+#define XP70_VER_OFST		0x4
+
+#define XP70_EN_OFST		0x8
+#define XP70_EN_RUN			BIT(0)
+
+#define XP70_CLK_GATE_OFST	0xC
+#define XP70_CLK_GATE_DIS		BIT(0)
+#define XP70_CLK_GATE_RESET		BIT(2)
+
+#define XP70_SLIM_PC_OFST	0x20
+
+/* dmem registers */
+#define XP70_REV_ID_OFST	0x0
+#define XP70_REV_ID_MIN_MASK		GENMASK(15, 8)
+#define XP70_REV_ID_MIN(id)		((id & XP70_REV_ID_MIN_MASK) >> 8)
+#define XP70_REV_ID_MAJ_MASK		GENMASK(23, 16)
+#define XP70_REV_ID_MAJ(id)		((id & XP70_REV_ID_MAJ_MASK) >> 16)
+
+
+/* peripherals registers */
+#define XP70_STBUS_SYNC_OFST	0xF88
+#define XP70_STBUS_SYNC_DIS		BIT(0)
+
+#define XP70_INT_SET_OFST	0xFD4
+#define XP70_INT_CLR_OFST	0xFD8
+#define XP70_INT_MASK_OFST	0xFDC
+
+#define XP70_CMD_CLR_OFST	0xFC8
+#define XP70_CMD_MASK_OFST	0xFCC
+
+const char *mem_names[XP70_MEM_MAX] = {
+	[DMEM]		= "dmem",
+	[IMEM]		= "imem",
+};
+
+static int xp70_clk_get(struct st_xp70_rproc *xp70_rproc, struct device *dev)
+{
+	int clk, err = 0;
+
+	for (clk = 0; clk < XP70_MAX_CLK; clk++) {
+		xp70_rproc->clks[clk] = of_clk_get(dev->of_node, clk);
+		if (IS_ERR(xp70_rproc->clks[clk])) {
+			err = PTR_ERR(xp70_rproc->clks[clk]);
+			if (err == -EPROBE_DEFER)
+				goto err_put_clks;
+			xp70_rproc->clks[clk] = NULL;
+			break;
+		}
+	}
+
+	return 0;
+
+err_put_clks:
+	while (--clk >= 0)
+		clk_put(xp70_rproc->clks[clk]);
+
+	return err;
+}
+
+static void xp70_clk_disable(struct st_xp70_rproc *xp70_rproc)
+{
+	int clk;
+
+	for (clk = 0; clk < XP70_MAX_CLK && xp70_rproc->clks[clk]; clk++)
+		clk_disable_unprepare(xp70_rproc->clks[clk]);
+}
+
+static int xp70_clk_enable(struct st_xp70_rproc *xp70_rproc)
+{
+	int clk, ret;
+
+	for (clk = 0; clk < XP70_MAX_CLK && xp70_rproc->clks[clk]; clk++) {
+		ret = clk_prepare_enable(xp70_rproc->clks[clk]);
+		if (ret)
+			goto err_disable_clks;
+	}
+
+	return 0;
+
+err_disable_clks:
+	while (--clk >= 0)
+		clk_disable_unprepare(xp70_rproc->clks[clk]);
+
+	return ret;
+}
+
+/**
+ * Remoteproc xp70 specific device handlers
+ */
+static int xp70_rproc_start(struct rproc *rproc)
+{
+	struct device *dev = &rproc->dev;
+	struct st_xp70_rproc *xp70_rproc = rproc->priv;
+	unsigned long hw_id, hw_ver, fw_rev;
+	u32 val, ret = 0;
+
+	ret = xp70_clk_enable(xp70_rproc);
+	if (ret) {
+		dev_err(dev, "Failed to enable clocks\n");
+		goto err_clk;
+	}
+
+	/* disable CPU pipeline clock & reset cpu pipeline */
+	val = XP70_CLK_GATE_DIS | XP70_CLK_GATE_RESET;
+	writel_relaxed(val, xp70_rproc->slimcore + XP70_CLK_GATE_OFST);
+
+	/* disable SLIM core STBus sync */
+	writel_relaxed(XP70_STBUS_SYNC_DIS,
+		xp70_rproc->peri + XP70_STBUS_SYNC_OFST);
+
+	/* enable cpu pipeline clock */
+	writel_relaxed(!XP70_CLK_GATE_DIS,
+		xp70_rproc->slimcore + XP70_CLK_GATE_OFST);
+
+	/* clear int & cmd mailbox */
+	writel_relaxed(~0UL, xp70_rproc->peri + XP70_INT_CLR_OFST);
+	writel_relaxed(~0UL, xp70_rproc->peri + XP70_CMD_CLR_OFST);
+
+	/* enable all channels cmd & int */
+	writel_relaxed(~0UL, xp70_rproc->peri + XP70_INT_MASK_OFST);
+	writel_relaxed(~0UL, xp70_rproc->peri + XP70_CMD_MASK_OFST);
+
+	/* enable cpu */
+	writel(XP70_EN_RUN, xp70_rproc->slimcore + XP70_EN_OFST);
+
+	hw_id = readl_relaxed(xp70_rproc->slimcore + XP70_ID_OFST);
+	hw_ver = readl_relaxed(xp70_rproc->slimcore + XP70_VER_OFST);
+
+	fw_rev = readl_relaxed(xp70_rproc->mem[DMEM].cpu_addr +
+			XP70_REV_ID_OFST);
+
+	dev_info(dev, "fw rev:%ld.%ld on SLIM %ld.%ld\n",
+		 XP70_REV_ID_MAJ(fw_rev), XP70_REV_ID_MIN(fw_rev),
+		 hw_id, hw_ver);
+
+	dev_dbg(dev, "XP70 started\n");
+
+err_clk:
+	return ret;
+}
+
+static int xp70_rproc_stop(struct rproc *rproc)
+{
+	struct st_xp70_rproc *xp70_rproc = rproc->priv;
+	u32 val;
+
+	/* mask all (cmd & int) channels */
+	writel_relaxed(0UL, xp70_rproc->peri + XP70_INT_MASK_OFST);
+	writel_relaxed(0UL, xp70_rproc->peri + XP70_CMD_MASK_OFST);
+
+	/* disable cpu pipeline clock */
+	writel_relaxed(XP70_CLK_GATE_DIS
+		, xp70_rproc->slimcore + XP70_CLK_GATE_OFST);
+
+	writel_relaxed(!XP70_EN_RUN, xp70_rproc->slimcore + XP70_EN_OFST);
+
+	val = readl_relaxed(xp70_rproc->slimcore + XP70_EN_OFST);
+	if (val & XP70_EN_RUN)
+		dev_warn(&rproc->dev, "Failed to disable XP70");
+
+	xp70_clk_disable(xp70_rproc);
+
+	dev_dbg(&rproc->dev, "xp70 stopped\n");
+
+	return 0;
+}
+
+static void *xp70_rproc_da_to_va(struct rproc *rproc, u64 da, int len)
+{
+	struct st_xp70_rproc *xp70_rproc = rproc->priv;
+	void *va = NULL;
+	int i;
+
+	for (i = 0; i < XP70_MEM_MAX; i++) {
+
+		if (da != xp70_rproc->mem[i].bus_addr)
+			continue;
+
+		va = xp70_rproc->mem[i].cpu_addr;
+			break;
+	}
+
+	dev_dbg(&rproc->dev, "%s: da = 0x%llx len = 0x%x va = 0x%p\n"
+		, __func__, da, len, va);
+
+	return va;
+}
+
+static struct rproc_ops xp70_rproc_ops = {
+	.start		= xp70_rproc_start,
+	.stop		= xp70_rproc_stop,
+	.da_to_va       = xp70_rproc_da_to_va,
+};
+
+/**
+ * Firmware handler operations: sanity, boot address, load ...
+ */
+
+static struct resource_table empty_rsc_tbl = {
+	.ver = 1,
+	.num = 0,
+};
+
+static struct resource_table *xp70_rproc_find_rsc_table(struct rproc *rproc,
+					       const struct firmware *fw,
+					       int *tablesz)
+{
+	if (!fw)
+		return NULL;
+
+	*tablesz = sizeof(empty_rsc_tbl);
+	return &empty_rsc_tbl;
+}
+
+static struct resource_table *xp70_rproc_find_loaded_rsc_table(struct rproc *rproc,
+						      const struct firmware *fw)
+{
+	if (!fw)
+		return NULL;
+
+	return &empty_rsc_tbl;
+}
+
+static struct rproc_fw_ops xp70_rproc_fw_ops = {
+	.find_rsc_table = xp70_rproc_find_rsc_table,
+	.find_loaded_rsc_table = xp70_rproc_find_loaded_rsc_table,
+};
+
+/**
+  * xp70_rproc_alloc - allocate and initialise xp70 rproc
+  * @pdev: Pointer to the platform_device struct
+  * @fw_name: Name of firmware for rproc to use
+  *
+  * Function for allocating and initialising a xp70 rproc for use by
+  * device drivers whose IP is based around the xp70 slim core. It
+  * obtains and enables any clocks required by the xp70 core and also
+  * ioremaps the various IO.
+  *
+  * Returns rproc pointer or PTR_ERR() on error.
+  */
+
+struct rproc *xp70_rproc_alloc(struct platform_device *pdev, char *fw_name)
+{
+	struct device *dev = &pdev->dev;
+	struct st_xp70_rproc *xp70_rproc;
+	struct device_node *np = dev->of_node;
+	struct rproc *rproc;
+	struct resource *res;
+	int err, i;
+	const struct rproc_fw_ops *elf_ops;
+
+	if (!np || !fw_name)
+		return ERR_PTR(-EINVAL);
+
+	if (!of_device_is_compatible(np, "st,xp70-rproc"))
+		return ERR_PTR(-EINVAL);
+
+	rproc = rproc_alloc(dev, np->name, &xp70_rproc_ops,
+			fw_name, sizeof(*xp70_rproc));
+	if (!rproc)
+		return ERR_PTR(-ENOMEM);
+
+	rproc->has_iommu = false;
+
+	xp70_rproc = rproc->priv;
+	xp70_rproc->rproc = rproc;
+
+	/* Get standard ELF ops */
+	elf_ops = rproc_get_elf_ops();
+
+	/* Use some generic elf ops */
+	xp70_rproc_fw_ops.load = elf_ops->load;
+	xp70_rproc_fw_ops.sanity_check = elf_ops->sanity_check;
+
+	rproc->fw_ops = &xp70_rproc_fw_ops;
+
+	/* get imem and dmem */
+	for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
+		res = xp70_rproc->mem[i].io_res;
+
+		res = platform_get_resource_byname
+			(pdev, IORESOURCE_MEM, mem_names[i]);
+
+		xp70_rproc->mem[i].cpu_addr = devm_ioremap_resource(dev, res);
+		if (IS_ERR(xp70_rproc->mem[i].cpu_addr)) {
+			dev_err(&pdev->dev, "devm_ioremap_resource failed\n");
+			err = PTR_ERR(xp70_rproc->mem[i].cpu_addr);
+			goto err;
+		}
+		xp70_rproc->mem[i].bus_addr = res->start;
+		xp70_rproc->mem[i].size = resource_size(res);
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "slimcore");
+
+	xp70_rproc->slimcore = devm_ioremap_resource(dev, res);
+	if (IS_ERR(xp70_rproc->slimcore)) {
+		dev_err(&pdev->dev, "devm_ioremap_resource failed for slimcore\n");
+		err = PTR_ERR(xp70_rproc->slimcore);
+		goto err;
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "peripherals");
+
+	xp70_rproc->peri = devm_ioremap_resource(dev, res);
+	if (IS_ERR(xp70_rproc->peri)) {
+		dev_err(&pdev->dev, "devm_ioremap_resource failed for peri\n");
+		err = PTR_ERR(xp70_rproc->peri);
+		goto err;
+	}
+
+	err = xp70_clk_get(xp70_rproc, dev);
+	if (err)
+		goto err;
+
+	/* Register as a remoteproc device */
+	err = rproc_add(rproc);
+	if (err) {
+		dev_err(dev, "registration of xp70 remoteproc failed\n");
+		goto err;
+	}
+
+	dev_dbg(dev, "XP70 rproc init successful\n");
+	return rproc;
+
+err:
+	rproc_put(rproc);
+	return ERR_PTR(err);
+}
+EXPORT_SYMBOL(xp70_rproc_alloc);
+
+/**
+  * xp70_rproc_put - put xp70 rproc resources
+  * @xp70_rproc: Pointer to the st_xp70_rproc struct
+  *
+  * Function for calling respective _put() functions on
+  * xp70_rproc resources.
+  *
+  * Returns rproc pointer or PTR_ERR() on error.
+  */
+void xp70_rproc_put(struct st_xp70_rproc *xp70_rproc)
+{
+	int clk;
+
+	if (!xp70_rproc)
+		return;
+
+	rproc_put(xp70_rproc->rproc);
+
+	for (clk = 0; clk < XP70_MAX_CLK && xp70_rproc->clks[clk]; clk++)
+		clk_put(xp70_rproc->clks[clk]);
+
+}
+EXPORT_SYMBOL(xp70_rproc_put);
+
+MODULE_AUTHOR("Peter Griffin");
+MODULE_DESCRIPTION("STMicroelectronics XP70 rproc driver");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/remoteproc/st_xp70_rproc.h b/include/linux/remoteproc/st_xp70_rproc.h
new file mode 100644
index 0000000..3aba2de
--- /dev/null
+++ b/include/linux/remoteproc/st_xp70_rproc.h
@@ -0,0 +1,56 @@ 
+/*
+ * st_xp70_rproc.h
+ *
+ * Copyright (C) 2016 STMicroelectronics
+ * Author: Peter Griffin <peter.griffin@linaro.org>
+ * License terms:  GNU General Public License (GPL), version 2
+ */
+#ifndef _ST_XP70_H
+#define _ST_XP70_H
+
+#define XP70_MEM_MAX 2
+#define XP70_MAX_CLK 4
+#define NAME_SZ 10
+
+enum {
+	DMEM,
+	IMEM,
+};
+
+/**
+ * struct xp70_mem - xp70 internal memory structure
+ * @cpu_addr: MPU virtual address of the memory region
+ * @bus_addr: Bus address used to access the memory region
+ * @dev_addr: Device address from Wakeup M3 view
+ * @size: Size of the memory region
+ */
+struct xp70_mem {
+	void __iomem *cpu_addr;
+	phys_addr_t bus_addr;
+	u32 dev_addr;
+	size_t size;
+	struct resource *io_res;
+};
+
+/**
+ * struct st_xp70_rproc - XP70 slim core
+ * @rproc: rproc handle
+ * @pdev: pointer to platform device
+ * @mem: xp70 memory information
+ * @slimcore: xp70 slimcore regs
+ * @peri: xp70 peripheral regs
+ * @clks: xp70 clocks
+ */
+struct st_xp70_rproc {
+	struct rproc *rproc;
+	struct platform_device *pdev;
+	struct xp70_mem mem[XP70_MEM_MAX];
+	void __iomem *slimcore;
+	void __iomem *peri;
+	struct clk *clks[XP70_MAX_CLK];
+};
+
+struct rproc *xp70_rproc_alloc(struct platform_device *pdev, char *fw_name);
+void xp70_rproc_put(struct st_xp70_rproc *xp70_rproc);
+
+#endif