[ARM] 3569/2: netX: driver for XMAC/XPEC engines

Patch from Sascha Hauer

The netX processors have generic network bitstream engines (XMAC/XPEC).
This driver adds support for firmware loading and start, stop, reset
commands.

Signed-off-by: Robert Schwebel <r.schwebel@pengutronix.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

2 files changed, 256 insertions, 1 deletions

diff --git a/arch/arm/mach-netx/Makefile b/arch/arm/mach-netx/Makefile
index cd42408..b2b7dd2 100644
--- a/arch/arm/mach-netx/Makefile
+++ b/arch/arm/mach-netx/Makefile
@@ -7,5 +7,5 @@
 
 # Object file lists.
 
-obj-y			+= time.o generic.o pfifo.o
+obj-y			+= time.o generic.o pfifo.o xc.o
 
diff --git a/arch/arm/mach-netx/xc.c b/arch/arm/mach-netx/xc.c
new file mode 100644
index 0000000..172a058
--- /dev/null
+++ b/arch/arm/mach-netx/xc.c
@@ -0,0 +1,255 @@
+/*
+ * arch/arm/mach-netx/xc.c
+ *
+ * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
+ *
+ * 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.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/firmware.h>
+#include <linux/mutex.h>
+
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/arch/netx-regs.h>
+
+#include <asm/arch/xc.h>
+
+static DEFINE_MUTEX(xc_lock);
+
+static int xc_in_use = 0;
+
+struct fw_desc {
+	unsigned int ofs;
+	unsigned int size;
+	unsigned int patch_ofs;
+	unsigned int patch_entries;
+};
+
+struct fw_header {
+	unsigned int magic;
+	unsigned int type;
+	unsigned int version;
+	unsigned int reserved[5];
+	struct fw_desc fw_desc[3];
+} __attribute__ ((packed));
+
+int xc_stop(struct xc *x)
+{
+	writel(RPU_HOLD_PC, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
+	writel(TPU_HOLD_PC, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
+	writel(XPU_HOLD_PC, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
+	return 0;
+}
+
+int xc_start(struct xc *x)
+{
+	writel(0, x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS);
+	writel(0, x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS);
+	writel(0, x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS);
+	return 0;
+}
+
+int xc_running(struct xc *x)
+{
+	return (readl(x->xmac_base + NETX_XMAC_RPU_HOLD_PC_OFS) & RPU_HOLD_PC)
+	    || (readl(x->xmac_base + NETX_XMAC_TPU_HOLD_PC_OFS) & TPU_HOLD_PC)
+	    || (readl(x->xpec_base + NETX_XPEC_XPU_HOLD_PC_OFS) & XPU_HOLD_PC) ?
+		0 : 1;
+}
+
+int xc_reset(struct xc *x)
+{
+	writel(0, x->xpec_base + NETX_XPEC_PC_OFS);
+	return 0;
+}
+
+static int xc_check_ptr(struct xc *x, unsigned long adr, unsigned int size)
+{
+	if (adr >= NETX_PA_XMAC(x->no) &&
+	    adr + size < NETX_PA_XMAC(x->no) + XMAC_MEM_SIZE)
+		return 0;
+
+	if (adr >= NETX_PA_XPEC(x->no) &&
+	    adr + size < NETX_PA_XPEC(x->no) + XPEC_MEM_SIZE)
+		return 0;
+
+	dev_err(x->dev, "Illegal pointer in firmware found. aborting\n");
+
+	return -1;
+}
+
+static int xc_patch(struct xc *x, void *patch, int count)
+{
+	unsigned int val, adr;
+	unsigned int *data = patch;
+
+	int i;
+	for (i = 0; i < count; i++) {
+		adr = *data++;
+		val = *data++;
+		if (xc_check_ptr(x, adr, 4) < 0)
+			return -EINVAL;
+
+		writel(val, (void __iomem *)io_p2v(adr));
+	}
+	return 0;
+}
+
+int xc_request_firmware(struct xc *x)
+{
+	int ret;
+	char name[16];
+	const struct firmware *fw;
+	struct fw_header *head;
+	unsigned int size;
+	int i;
+	void *src;
+	unsigned long dst;
+
+	sprintf(name, "xc%d.bin", x->no);
+
+	ret = request_firmware(&fw, name, x->dev);
+
+	if (ret < 0) {
+		dev_err(x->dev, "request_firmware failed\n");
+		return ret;
+	}
+
+	head = (struct fw_header *)fw->data;
+	if (head->magic != 0x4e657458) {
+		if (head->magic == 0x5874654e) {
+			dev_err(x->dev,
+			    "firmware magic is 'XteN'. Endianess problems?\n");
+			ret = -ENODEV;
+			goto exit_release_firmware;
+		}
+		dev_err(x->dev, "unrecognized firmware magic 0x%08x\n",
+			head->magic);
+		ret = -ENODEV;
+		goto exit_release_firmware;
+	}
+
+	x->type = head->type;
+	x->version = head->version;
+
+	ret = -EINVAL;
+
+	for (i = 0; i < 3; i++) {
+		src = fw->data + head->fw_desc[i].ofs;
+		dst = *(unsigned int *)src;
+		src += sizeof (unsigned int);
+		size = head->fw_desc[i].size - sizeof (unsigned int);
+
+		if (xc_check_ptr(x, dst, size))
+			goto exit_release_firmware;
+
+		memcpy((void *)io_p2v(dst), src, size);
+
+		src = fw->data + head->fw_desc[i].patch_ofs;
+		size = head->fw_desc[i].patch_entries;
+		ret = xc_patch(x, src, size);
+		if (ret < 0)
+			goto exit_release_firmware;
+	}
+
+	ret = 0;
+
+      exit_release_firmware:
+	release_firmware(fw);
+
+	return ret;
+}
+
+struct xc *request_xc(int xcno, struct device *dev)
+{
+	struct xc *x = NULL;
+
+	mutex_lock(&xc_lock);
+
+	if (xcno > 3)
+		goto exit;
+	if (xc_in_use & (1 << xcno))
+		goto exit;
+
+	x = kmalloc(sizeof (struct xc), GFP_KERNEL);
+	if (!x)
+		goto exit;
+
+	if (!request_mem_region
+	    (NETX_PA_XPEC(xcno), XPEC_MEM_SIZE, dev->kobj.name))
+		goto exit_free;
+
+	if (!request_mem_region
+	    (NETX_PA_XMAC(xcno), XMAC_MEM_SIZE, dev->kobj.name))
+		goto exit_release_1;
+
+	if (!request_mem_region
+	    (SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE, dev->kobj.name))
+		goto exit_release_2;
+
+	x->xpec_base = (void * __iomem)io_p2v(NETX_PA_XPEC(xcno));
+	x->xmac_base = (void * __iomem)io_p2v(NETX_PA_XMAC(xcno));
+	x->sram_base = ioremap(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
+	if (!x->sram_base)
+		goto exit_release_3;
+
+	x->irq = NETX_IRQ_XPEC(xcno);
+
+	x->no = xcno;
+	x->dev = dev;
+
+	xc_in_use |= (1 << xcno);
+
+	goto exit;
+
+      exit_release_3:
+	release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
+      exit_release_2:
+	release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
+      exit_release_1:
+	release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
+      exit_free:
+	kfree(x);
+	x = NULL;
+      exit:
+	mutex_unlock(&xc_lock);
+	return x;
+}
+
+void free_xc(struct xc *x)
+{
+	int xcno = x->no;
+
+	mutex_lock(&xc_lock);
+
+	iounmap(x->sram_base);
+	release_mem_region(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE);
+	release_mem_region(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE);
+	release_mem_region(NETX_PA_XPEC(xcno), XPEC_MEM_SIZE);
+	xc_in_use &= ~(1 << x->no);
+	kfree(x);
+
+	mutex_unlock(&xc_lock);
+}
+
+EXPORT_SYMBOL(free_xc);
+EXPORT_SYMBOL(request_xc);
+EXPORT_SYMBOL(xc_request_firmware);
+EXPORT_SYMBOL(xc_reset);
+EXPORT_SYMBOL(xc_running);
+EXPORT_SYMBOL(xc_start);
+EXPORT_SYMBOL(xc_stop);