[ARM] 3569/2: netX: driver for XMAC/XPEC engines
authorSascha Hauer <sascha@saschahauer.de>
Mon, 19 Jun 2006 14:28:20 +0000 (15:28 +0100)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Mon, 19 Jun 2006 14:28:20 +0000 (15:28 +0100)
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>
arch/arm/mach-netx/Makefile
arch/arm/mach-netx/xc.c [new file with mode: 0644]
include/asm-arm/arch-netx/xc.h [new file with mode: 0644]

index cd424083e5b9847af2321b993292f827bc54c221..b2b7dd25f2183374bd391bec893413d9dba8840c 100644 (file)
@@ -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 (file)
index 0000000..172a058
--- /dev/null
@@ -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);
diff --git a/include/asm-arm/arch-netx/xc.h b/include/asm-arm/arch-netx/xc.h
new file mode 100644 (file)
index 0000000..659af19
--- /dev/null
@@ -0,0 +1,42 @@
+/*
+ *  linux/include/asm-arm/arch-netx/xc.h
+ *
+ * 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
+ */
+
+#ifndef __ASM_ARCH_XC_H
+#define __ASM_ARCH_XC_H
+
+struct xc {
+       int no;
+       unsigned int type;
+       unsigned int version;
+       void __iomem *xpec_base;
+       void __iomem *xmac_base;
+       void __iomem *sram_base;
+       int irq;
+       struct device *dev;
+};
+
+int xc_reset(struct xc *x);
+int xc_stop(struct xc* x);
+int xc_start(struct xc *x);
+int xc_running(struct xc *x);
+int xc_request_firmware(struct xc* x);
+struct xc* request_xc(int xcno, struct device *dev);
+void free_xc(struct xc *x);
+
+#endif /* __ASM_ARCH_XC_H */