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author | Sascha Hauer <sascha@saschahauer.de> | 2006-06-19 15:28:20 +0100 |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2006-06-19 15:28:20 +0100 |
commit | 8e77da68a6107ee47323fec5dfb3a93ebbc809e2 (patch) | |
tree | e7cee971204ddf5e9e5729f264c3480425e07e01 /arch/arm/mach-netx/xc.c | |
parent | ef70cd4d247defcd7c0f789a5a98deab0afadf53 (diff) | |
download | op-kernel-dev-8e77da68a6107ee47323fec5dfb3a93ebbc809e2.zip op-kernel-dev-8e77da68a6107ee47323fec5dfb3a93ebbc809e2.tar.gz |
[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>
Diffstat (limited to 'arch/arm/mach-netx/xc.c')
-rw-r--r-- | arch/arm/mach-netx/xc.c | 255 |
1 files changed, 255 insertions, 0 deletions
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); |