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// SPDX-License-Identifier: GPL-2.0-only
/*
* arch/arm/mach-netx/xc.c
*
* Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*/
#include <linux/init.h>
#include <linux/device.h>
#include <linux/firmware.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <linux/export.h>
#include <mach/hardware.h>
#include <mach/irqs.h>
#include <mach/netx-regs.h>
#include <mach/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, const void *patch, int count)
{
unsigned int val, adr;
const 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;
const 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'. Endianness 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, kobject_name(&dev->kobj)))
goto exit_free;
if (!request_mem_region
(NETX_PA_XMAC(xcno), XMAC_MEM_SIZE, kobject_name(&dev->kobj)))
goto exit_release_1;
if (!request_mem_region
(SRAM_INTERNAL_PHYS(xcno), SRAM_MEM_SIZE, kobject_name(&dev->kobj)))
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);
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