u-boot/drivers/misc/swap_case.c

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// SPDX-License-Identifier: GPL-2.0+
/*
* PCI emulation device which swaps the case of text
*
* Copyright (c) 2014 Google, Inc
* Written by Simon Glass <sjg@chromium.org>
*/
#include <common.h>
#include <dm.h>
#include <errno.h>
#include <pci.h>
#include <asm/test.h>
#include <linux/ctype.h>
/**
* struct swap_case_platdata - platform data for this device
*
* @command: Current PCI command value
* @bar: Current base address values
*/
struct swap_case_platdata {
u16 command;
u32 bar[6];
};
enum {
MEM_TEXT_SIZE = 0x100,
};
enum swap_case_op {
OP_TO_LOWER,
OP_TO_UPPER,
OP_SWAP,
};
static struct pci_bar {
int type;
u32 size;
} barinfo[] = {
{ PCI_BASE_ADDRESS_SPACE_IO, 1 },
{ PCI_BASE_ADDRESS_MEM_TYPE_32, MEM_TEXT_SIZE },
{ 0, 0 },
{ 0, 0 },
{ 0, 0 },
{ 0, 0 },
};
struct swap_case_priv {
enum swap_case_op op;
char mem_text[MEM_TEXT_SIZE];
};
static int sandbox_swap_case_use_ea(const struct udevice *dev)
{
return !!ofnode_get_property(dev->node, "use-ea", NULL);
}
/* Please keep these macros in sync with ea_regs below */
#define PCI_CAP_ID_EA_SIZE (sizeof(ea_regs) + 4)
#define PCI_CAP_ID_EA_ENTRY_CNT 4
/* Hardcoded EA structure, excluding 1st DW. */
static const u32 ea_regs[] = {
/* BEI=0, ES=2, BAR0 32b Base + 32b MaxOffset, I/O space */
(2 << 8) | 2,
PCI_CAP_EA_BASE_LO0,
0,
/* BEI=1, ES=2, BAR1 32b Base + 32b MaxOffset */
(1 << 4) | 2,
PCI_CAP_EA_BASE_LO1,
MEM_TEXT_SIZE - 1,
/* BEI=2, ES=3, BAR2 64b Base + 32b MaxOffset */
(2 << 4) | 3,
PCI_CAP_EA_BASE_LO2 | PCI_EA_IS_64,
PCI_CAP_EA_SIZE_LO,
PCI_CAP_EA_BASE_HI2,
/* BEI=4, ES=4, BAR4 64b Base + 64b MaxOffset */
(4 << 4) | 4,
PCI_CAP_EA_BASE_LO4 | PCI_EA_IS_64,
PCI_CAP_EA_SIZE_LO | PCI_EA_IS_64,
PCI_CAP_EA_BASE_HI4,
PCI_CAP_EA_SIZE_HI,
};
static int sandbox_swap_case_read_ea(const struct udevice *emul, uint offset,
ulong *valuep, enum pci_size_t size)
{
u32 reg;
offset = offset - PCI_CAP_ID_EA_OFFSET - 4;
reg = ea_regs[offset >> 2];
reg >>= (offset % 4) * 8;
*valuep = reg;
return 0;
}
static int sandbox_swap_case_read_config(const struct udevice *emul,
uint offset, ulong *valuep,
enum pci_size_t size)
{
struct swap_case_platdata *plat = dev_get_platdata(emul);
/*
* The content of the EA capability structure is handled elsewhere to
* keep the switch/case below sane
*/
if (offset > PCI_CAP_ID_EA_OFFSET + PCI_CAP_LIST_NEXT &&
offset < PCI_CAP_ID_EA_OFFSET + PCI_CAP_ID_EA_SIZE)
return sandbox_swap_case_read_ea(emul, offset, valuep, size);
switch (offset) {
case PCI_COMMAND:
*valuep = plat->command;
break;
case PCI_HEADER_TYPE:
*valuep = 0;
break;
case PCI_VENDOR_ID:
*valuep = SANDBOX_PCI_VENDOR_ID;
break;
case PCI_DEVICE_ID:
*valuep = SANDBOX_PCI_SWAP_CASE_EMUL_ID;
break;
case PCI_CLASS_DEVICE:
if (size == PCI_SIZE_8) {
*valuep = SANDBOX_PCI_CLASS_SUB_CODE;
} else {
*valuep = (SANDBOX_PCI_CLASS_CODE << 8) |
SANDBOX_PCI_CLASS_SUB_CODE;
}
break;
case PCI_CLASS_CODE:
*valuep = SANDBOX_PCI_CLASS_CODE;
break;
case PCI_BASE_ADDRESS_0:
case PCI_BASE_ADDRESS_1:
case PCI_BASE_ADDRESS_2:
case PCI_BASE_ADDRESS_3:
case PCI_BASE_ADDRESS_4:
case PCI_BASE_ADDRESS_5: {
int barnum;
u32 *bar;
barnum = pci_offset_to_barnum(offset);
bar = &plat->bar[barnum];
*valuep = sandbox_pci_read_bar(*bar, barinfo[barnum].type,
barinfo[barnum].size);
break;
}
case PCI_CAPABILITY_LIST:
*valuep = PCI_CAP_ID_PM_OFFSET;
break;
case PCI_CAP_ID_PM_OFFSET:
*valuep = (PCI_CAP_ID_EXP_OFFSET << 8) | PCI_CAP_ID_PM;
break;
case PCI_CAP_ID_PM_OFFSET + PCI_CAP_LIST_NEXT:
*valuep = PCI_CAP_ID_EXP_OFFSET;
break;
case PCI_CAP_ID_EXP_OFFSET:
*valuep = (PCI_CAP_ID_MSIX_OFFSET << 8) | PCI_CAP_ID_EXP;
break;
case PCI_CAP_ID_EXP_OFFSET + PCI_CAP_LIST_NEXT:
*valuep = PCI_CAP_ID_MSIX_OFFSET;
break;
case PCI_CAP_ID_MSIX_OFFSET:
if (sandbox_swap_case_use_ea(emul))
*valuep = (PCI_CAP_ID_EA_OFFSET << 8) | PCI_CAP_ID_MSIX;
else
*valuep = PCI_CAP_ID_MSIX;
break;
case PCI_CAP_ID_MSIX_OFFSET + PCI_CAP_LIST_NEXT:
if (sandbox_swap_case_use_ea(emul))
*valuep = PCI_CAP_ID_EA_OFFSET;
else
*valuep = 0;
break;
case PCI_CAP_ID_EA_OFFSET:
*valuep = (PCI_CAP_ID_EA_ENTRY_CNT << 16) | PCI_CAP_ID_EA;
break;
case PCI_CAP_ID_EA_OFFSET + PCI_CAP_LIST_NEXT:
*valuep = 0;
break;
case PCI_EXT_CAP_ID_ERR_OFFSET:
*valuep = (PCI_EXT_CAP_ID_VC_OFFSET << 20) | PCI_EXT_CAP_ID_ERR;
break;
case PCI_EXT_CAP_ID_VC_OFFSET:
*valuep = (PCI_EXT_CAP_ID_DSN_OFFSET << 20) | PCI_EXT_CAP_ID_VC;
break;
case PCI_EXT_CAP_ID_DSN_OFFSET:
*valuep = PCI_EXT_CAP_ID_DSN;
break;
}
return 0;
}
static int sandbox_swap_case_write_config(struct udevice *emul, uint offset,
ulong value, enum pci_size_t size)
{
struct swap_case_platdata *plat = dev_get_platdata(emul);
switch (offset) {
case PCI_COMMAND:
plat->command = value;
break;
case PCI_BASE_ADDRESS_0:
case PCI_BASE_ADDRESS_1: {
int barnum;
u32 *bar;
barnum = pci_offset_to_barnum(offset);
bar = &plat->bar[barnum];
debug("w bar %d=%lx\n", barnum, value);
*bar = value;
/* space indicator (bit#0) is read-only */
*bar |= barinfo[barnum].type;
break;
}
}
return 0;
}
static int sandbox_swap_case_find_bar(struct udevice *emul, unsigned int addr,
int *barnump, unsigned int *offsetp)
{
struct swap_case_platdata *plat = dev_get_platdata(emul);
int barnum;
for (barnum = 0; barnum < ARRAY_SIZE(barinfo); barnum++) {
unsigned int size = barinfo[barnum].size;
u32 base = plat->bar[barnum] & ~PCI_BASE_ADDRESS_SPACE;
if (addr >= base && addr < base + size) {
*barnump = barnum;
*offsetp = addr - base;
return 0;
}
}
*barnump = -1;
return -ENOENT;
}
static void sandbox_swap_case_do_op(enum swap_case_op op, char *str, int len)
{
for (; len > 0; len--, str++) {
switch (op) {
case OP_TO_UPPER:
*str = toupper(*str);
break;
case OP_TO_LOWER:
*str = tolower(*str);
break;
case OP_SWAP:
if (isupper(*str))
*str = tolower(*str);
else
*str = toupper(*str);
break;
}
}
}
static int sandbox_swap_case_read_io(struct udevice *dev, unsigned int addr,
ulong *valuep, enum pci_size_t size)
{
struct swap_case_priv *priv = dev_get_priv(dev);
unsigned int offset;
int barnum;
int ret;
ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
if (ret)
return ret;
if (barnum == 0 && offset == 0)
*valuep = (*valuep & ~0xff) | priv->op;
return 0;
}
static int sandbox_swap_case_write_io(struct udevice *dev, unsigned int addr,
ulong value, enum pci_size_t size)
{
struct swap_case_priv *priv = dev_get_priv(dev);
unsigned int offset;
int barnum;
int ret;
ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
if (ret)
return ret;
if (barnum == 0 && offset == 0)
priv->op = value;
return 0;
}
static int pci_ea_bar2_magic = PCI_EA_BAR2_MAGIC;
static int pci_ea_bar4_magic = PCI_EA_BAR4_MAGIC;
static int sandbox_swap_case_map_physmem(struct udevice *dev,
phys_addr_t addr, unsigned long *lenp, void **ptrp)
{
struct swap_case_priv *priv = dev_get_priv(dev);
unsigned int offset, avail;
int barnum;
int ret;
if (sandbox_swap_case_use_ea(dev)) {
/*
* only support mapping base address in EA test for now, we
* don't handle mapping an offset inside a BAR. Seems good
* enough for the current test.
*/
switch (addr) {
case (phys_addr_t)PCI_CAP_EA_BASE_LO0:
*ptrp = &priv->op;
*lenp = 4;
break;
case (phys_addr_t)PCI_CAP_EA_BASE_LO1:
*ptrp = priv->mem_text;
*lenp = barinfo[1].size - 1;
break;
case (phys_addr_t)((PCI_CAP_EA_BASE_HI2 << 32) |
PCI_CAP_EA_BASE_LO2):
*ptrp = &pci_ea_bar2_magic;
*lenp = PCI_CAP_EA_SIZE_LO;
break;
case (phys_addr_t)((PCI_CAP_EA_BASE_HI4 << 32) |
PCI_CAP_EA_BASE_LO4):
*ptrp = &pci_ea_bar4_magic;
*lenp = (PCI_CAP_EA_SIZE_HI << 32) |
PCI_CAP_EA_SIZE_LO;
break;
default:
return -ENOENT;
}
return 0;
}
ret = sandbox_swap_case_find_bar(dev, addr, &barnum, &offset);
if (ret)
return ret;
if (barnum == 1) {
*ptrp = priv->mem_text + offset;
avail = barinfo[1].size - offset;
if (avail > barinfo[1].size)
*lenp = 0;
else
*lenp = min(*lenp, (ulong)avail);
return 0;
}
return -ENOENT;
}
static int sandbox_swap_case_unmap_physmem(struct udevice *dev,
const void *vaddr, unsigned long len)
{
struct swap_case_priv *priv = dev_get_priv(dev);
sandbox_swap_case_do_op(priv->op, (void *)vaddr, len);
return 0;
}
static struct dm_pci_emul_ops sandbox_swap_case_emul_ops = {
.read_config = sandbox_swap_case_read_config,
.write_config = sandbox_swap_case_write_config,
.read_io = sandbox_swap_case_read_io,
.write_io = sandbox_swap_case_write_io,
.map_physmem = sandbox_swap_case_map_physmem,
.unmap_physmem = sandbox_swap_case_unmap_physmem,
};
static const struct udevice_id sandbox_swap_case_ids[] = {
{ .compatible = "sandbox,swap-case" },
{ }
};
U_BOOT_DRIVER(sandbox_swap_case_emul) = {
.name = "sandbox_swap_case_emul",
.id = UCLASS_PCI_EMUL,
.of_match = sandbox_swap_case_ids,
.ops = &sandbox_swap_case_emul_ops,
.priv_auto_alloc_size = sizeof(struct swap_case_priv),
.platdata_auto_alloc_size = sizeof(struct swap_case_platdata),
};
static struct pci_device_id sandbox_swap_case_supported[] = {
{ PCI_VDEVICE(SANDBOX, SANDBOX_PCI_SWAP_CASE_EMUL_ID),
SWAP_CASE_DRV_DATA },
{},
};
U_BOOT_PCI_DEVICE(sandbox_swap_case_emul, sandbox_swap_case_supported);