// SPDX-License-Identifier: GPL-2.0-only
/*
*
* FIXME: Properly make this race free with refcounting etc...
*
* FIXME: LOCKING !!!
*/
#include <linux/delay.h>
#include <linux/kernel.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <asm/pmac_pfunc.h>
/* Debug */
#define LOG_PARSE(fmt...)
#define LOG_ERROR(fmt...) printk(fmt)
#define LOG_BLOB(t,b,c)
#undef DEBUG
#ifdef DEBUG
#define DBG(fmt...) printk(fmt)
#else
#define DBG(fmt...)
#endif
/* Command numbers */
#define PMF_CMD_LIST 0
#define PMF_CMD_WRITE_GPIO 1
#define PMF_CMD_READ_GPIO 2
#define PMF_CMD_WRITE_REG32 3
#define PMF_CMD_READ_REG32 4
#define PMF_CMD_WRITE_REG16 5
#define PMF_CMD_READ_REG16 6
#define PMF_CMD_WRITE_REG8 7
#define PMF_CMD_READ_REG8 8
#define PMF_CMD_DELAY 9
#define PMF_CMD_WAIT_REG32 10
#define PMF_CMD_WAIT_REG16 11
#define PMF_CMD_WAIT_REG8 12
#define PMF_CMD_READ_I2C 13
#define PMF_CMD_WRITE_I2C 14
#define PMF_CMD_RMW_I2C 15
#define PMF_CMD_GEN_I2C 16
#define PMF_CMD_SHIFT_BYTES_RIGHT 17
#define PMF_CMD_SHIFT_BYTES_LEFT 18
#define PMF_CMD_READ_CFG 19
#define PMF_CMD_WRITE_CFG 20
#define PMF_CMD_RMW_CFG 21
#define PMF_CMD_READ_I2C_SUBADDR 22
#define PMF_CMD_WRITE_I2C_SUBADDR 23
#define PMF_CMD_SET_I2C_MODE 24
#define PMF_CMD_RMW_I2C_SUBADDR 25
#define PMF_CMD_READ_REG32_MASK_SHR_XOR 26
#define PMF_CMD_READ_REG16_MASK_SHR_XOR 27
#define PMF_CMD_READ_REG8_MASK_SHR_XOR 28
#define PMF_CMD_WRITE_REG32_SHL_MASK 29
#define PMF_CMD_WRITE_REG16_SHL_MASK 30
#define PMF_CMD_WRITE_REG8_SHL_MASK 31
#define PMF_CMD_MASK_AND_COMPARE 32
#define PMF_CMD_COUNT 33
/* This structure holds the state of the parser while walking through
* a function definition
*/
struct pmf_cmd {
const void *cmdptr;
const void *cmdend;
struct pmf_function *func;
void *instdata;
struct pmf_args *args;
int error;
};
#if 0
/* Debug output */
static void print_blob(const char *title, const void *blob, int bytes)
{
printk("%s", title);
while(bytes--) {
printk("%02x ", *((u8 *)blob));
blob += 1;
}
printk("\n");
}
#endif
/*
* Parser helpers
*/
static u32 pmf_next32(struct pmf_cmd *cmd)
{
u32 value;
if ((cmd->cmdend - cmd->cmdptr) < 4) {
cmd->error = 1;
return 0;
}
value = *((u32 *)cmd->cmdptr);
cmd->cmdptr += 4;
return value;
}
static const void* pmf_next_blob(struct pmf_cmd *cmd, int count)
{
const void *value;
if ((cmd->cmdend - cmd->cmdptr) < count) {
cmd->error = 1;
return NULL;
}
value = cmd->cmdptr;
cmd->cmdptr += count;
return value;
}
/*
* Individual command parsers
*/
#define PMF_PARSE_CALL(name, cmd, handlers, p...) \
do { \
if (cmd->error) \
return -ENXIO; \
if (handlers == NULL) \
return 0; \
if (handlers->name) \
return handlers->name(cmd->func, cmd->instdata, \
cmd->args, p); \
return -1; \
} while(0) \
static int pmf_parser_write_gpio(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u8 value = (u8)pmf_next32(cmd);
u8 mask = (u8)pmf_next32(cmd);
LOG_PARSE("pmf: write_gpio(value: %02x, mask: %02x)\n", value, mask);
PMF_PARSE_CALL(write_gpio, cmd, h, value, mask);
}
static int pmf_parser_read_gpio(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u8 mask = (u8)pmf_next32(cmd);
int rshift = (int)pmf_next32(cmd);
u8 xor = (u8)pmf_next32(cmd);
LOG_PARSE("pmf: read_gpio(mask: %02x, rshift: %d, xor: %02x)\n",
mask, rshift, xor);
PMF_PARSE_CALL(read_gpio, cmd, h, mask, rshift, xor);
}
static int pmf_parser_write_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 value = pmf_next32(cmd);
u32 mask = pmf_next32(cmd);
LOG_PARSE("pmf: write_reg32(offset: %08x, value: %08x, mask: %08x)\n",
offset, value, mask);
PMF_PARSE_CALL(write_reg32, cmd, h, offset, value, mask);
}
static int pmf_parser_read_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
LOG_PARSE("pmf: read_reg32(offset: %08x)\n", offset);
PMF_PARSE_CALL(read_reg32, cmd, h, offset);
}
static int pmf_parser_write_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u16 value = (u16)pmf_next32(cmd);
u16 mask = (u16)pmf_next32(cmd);
LOG_PARSE("pmf: write_reg16(offset: %08x, value: %04x, mask: %04x)\n",
offset, value, mask);
PMF_PARSE_CALL(write_reg16, cmd, h, offset, value, mask);
}
static int pmf_parser_read_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
LOG_PARSE("pmf: read_reg16(offset: %08x)\n", offset);
PMF_PARSE_CALL(read_reg16, cmd, h, offset);
}
static int pmf_parser_write_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u8 value = (u16)pmf_next32(cmd);
u8 mask = (u16)pmf_next32(cmd);
LOG_PARSE("pmf: write_reg8(offset: %08x, value: %02x, mask: %02x)\n",
offset, value, mask);
PMF_PARSE_CALL(write_reg8, cmd, h, offset, value, mask);
}
static int pmf_parser_read_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
LOG_PARSE("pmf: read_reg8(offset: %08x)\n", offset);
PMF_PARSE_CALL(read_reg8, cmd, h, offset);
}
static int pmf_parser_delay(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 duration = pmf_next32(cmd);
LOG_PARSE("pmf: delay(duration: %d us)\n", duration);
PMF_PARSE_CALL(delay, cmd, h, duration);
}
static int pmf_parser_wait_reg32(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 value = pmf_next32(cmd);
u32 mask = pmf_next32(cmd);
LOG_PARSE("pmf: wait_reg32(offset: %08x, comp_value: %08x,mask: %08x)\n",
offset, value, mask);
PMF_PARSE_CALL(wait_reg32, cmd, h, offset, value, mask);
}
static int pmf_parser_wait_reg16(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u16 value = (u16)pmf_next32(cmd);
u16 mask = (u16)pmf_next32(cmd);
LOG_PARSE("pmf: wait_reg16(offset: %08x, comp_value: %04x,mask: %04x)\n",
offset, value, mask);
PMF_PARSE_CALL(wait_reg16, cmd, h, offset, value, mask);
}
static int pmf_parser_wait_reg8(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u8 value = (u8)pmf_next32(cmd);
u8 mask = (u8)pmf_next32(cmd);
LOG_PARSE("pmf: wait_reg8(offset: %08x, comp_value: %02x,mask: %02x)\n",
offset, value, mask);
PMF_PARSE_CALL(wait_reg8, cmd, h, offset, value, mask);
}
static int pmf_parser_read_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 bytes = pmf_next32(cmd);
LOG_PARSE("pmf: read_i2c(bytes: %ud)\n", bytes);
PMF_PARSE_CALL(read_i2c, cmd, h, bytes);
}
static int pmf_parser_write_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 bytes = pmf_next32(cmd);
const void *blob = pmf_next_blob(cmd, bytes);
LOG_PARSE("pmf: write_i2c(bytes: %ud) ...\n", bytes);
LOG_BLOB("pmf: data: \n", blob, bytes);
PMF_PARSE_CALL(write_i2c, cmd, h, bytes, blob);
}
static int pmf_parser_rmw_i2c(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 maskbytes = pmf_next32(cmd);
u32 valuesbytes = pmf_next32(cmd);
u32 totalbytes = pmf_next32(cmd);
const void *maskblob = pmf_next_blob(cmd, maskbytes);
const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
LOG_PARSE("pmf: rmw_i2c(maskbytes: %ud, valuebytes: %ud, "
"totalbytes: %d) ...\n",
maskbytes, valuesbytes, totalbytes);
LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
PMF_PARSE_CALL(rmw_i2c, cmd, h, maskbytes, valuesbytes, totalbytes,
maskblob, valuesblob);
}
static int pmf_parser_read_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 bytes = pmf_next32(cmd);
LOG_PARSE("pmf: read_cfg(offset: %x, bytes: %ud)\n", offset, bytes);
PMF_PARSE_CALL(read_cfg, cmd, h, offset, bytes);
}
static int pmf_parser_write_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 bytes = pmf_next32(cmd);
const void *blob = pmf_next_blob(cmd, bytes);
LOG_PARSE("pmf: write_cfg(offset: %x, bytes: %ud)\n", offset, bytes);
LOG_BLOB("pmf: data: \n", blob, bytes);
PMF_PARSE_CALL(write_cfg, cmd, h, offset, bytes, blob);
}
static int pmf_parser_rmw_cfg(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 maskbytes = pmf_next32(cmd);
u32 valuesbytes = pmf_next32(cmd);
u32 totalbytes = pmf_next32(cmd);
const void *maskblob = pmf_next_blob(cmd, maskbytes);
const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
LOG_PARSE("pmf: rmw_cfg(maskbytes: %ud, valuebytes: %ud,"
" totalbytes: %d) ...\n",
maskbytes, valuesbytes, totalbytes);
LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
PMF_PARSE_CALL(rmw_cfg, cmd, h, offset, maskbytes, valuesbytes,
totalbytes, maskblob, valuesblob);
}
static int pmf_parser_read_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u8 subaddr = (u8)pmf_next32(cmd);
u32 bytes = pmf_next32(cmd);
LOG_PARSE("pmf: read_i2c_sub(subaddr: %x, bytes: %ud)\n",
subaddr, bytes);
PMF_PARSE_CALL(read_i2c_sub, cmd, h, subaddr, bytes);
}
static int pmf_parser_write_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u8 subaddr = (u8)pmf_next32(cmd);
u32 bytes = pmf_next32(cmd);
const void *blob = pmf_next_blob(cmd, bytes);
LOG_PARSE("pmf: write_i2c_sub(subaddr: %x, bytes: %ud) ...\n",
subaddr, bytes);
LOG_BLOB("pmf: data: \n", blob, bytes);
PMF_PARSE_CALL(write_i2c_sub, cmd, h, subaddr, bytes, blob);
}
static int pmf_parser_set_i2c_mode(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u32 mode = pmf_next32(cmd);
LOG_PARSE("pmf: set_i2c_mode(mode: %d)\n", mode);
PMF_PARSE_CALL(set_i2c_mode, cmd, h, mode);
}
static int pmf_parser_rmw_i2c_sub(struct pmf_cmd *cmd, struct pmf_handlers *h)
{
u8 subaddr = (u8)pmf_next32(cmd);
u32 maskbytes = pmf_next32(cmd);
u32 valuesbytes = pmf_next32(cmd);
u32 totalbytes = pmf_next32(cmd);
const void *maskblob = pmf_next_blob(cmd, maskbytes);
const void *valuesblob = pmf_next_blob(cmd, valuesbytes);
LOG_PARSE("pmf: rmw_i2c_sub(subaddr: %x, maskbytes: %ud, valuebytes: %ud"
", totalbytes: %d) ...\n",
subaddr, maskbytes, valuesbytes, totalbytes);
LOG_BLOB("pmf: mask data: \n", maskblob, maskbytes);
LOG_BLOB("pmf: values data: \n", valuesblob, valuesbytes);
PMF_PARSE_CALL(rmw_i2c_sub, cmd, h, subaddr, maskbytes, valuesbytes,
totalbytes, maskblob, valuesblob);
}
static int pmf_parser_read_reg32_msrx(struct pmf_cmd *cmd,
struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 mask = pmf_next32(cmd);
u32 shift = pmf_next32(cmd);
u32 xor = pmf_next32(cmd);
LOG_PARSE("pmf: read_reg32_msrx(offset: %x, mask: %x, shift: %x,"
" xor: %x\n", offset, mask, shift, xor);
PMF_PARSE_CALL(read_reg32_msrx, cmd, h, offset, mask, shift, xor);
}
static int pmf_parser_read_reg16_msrx(struct pmf_cmd *cmd,
struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 mask = pmf_next32(cmd);
u32 shift = pmf_next32(cmd);
u32 xor = pmf_next32(cmd);
LOG_PARSE("pmf: read_reg16_msrx(offset: %x, mask: %x, shift: %x,"
" xor: %x\n", offset, mask, shift, xor);
PMF_PARSE_CALL(read_reg16_msrx, cmd, h, offset, mask, shift, xor);
}
static int pmf_parser_read_reg8_msrx(struct pmf_cmd *cmd,
struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 mask = pmf_next32(cmd);
u32 shift = pmf_next32(cmd);
u32 xor = pmf_next32(cmd);
LOG_PARSE("pmf: read_reg8_msrx(offset: %x, mask: %x, shift: %x,"
" xor: %x\n", offset, mask, shift, xor);
PMF_PARSE_CALL(read_reg8_msrx, cmd, h, offset, mask, shift, xor);
}
static int pmf_parser_write_reg32_slm(struct pmf_cmd *cmd,
struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 shift = pmf_next32(cmd);
u32 mask = pmf_next32(cmd);
LOG_PARSE("pmf: write_reg32_slm(offset: %x, shift: %x, mask: %x\n",
offset, shift, mask);
PMF_PARSE_CALL(write_reg32_slm, cmd, h, offset, shift, mask);
}
static int pmf_parser_write_reg16_slm(struct pmf_cmd *cmd,
struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 shift = pmf_next32(cmd);
u32 mask = pmf_next32(cmd);
LOG_PARSE("pmf: write_reg16_slm(offset: %x, shift: %x, mask: %x\n",
offset, shift, mask);
PMF_PARSE_CALL(write_reg16_slm, cmd, h, offset, shift, mask);
}
static int pmf_parser_write_reg8_slm(struct pmf_cmd *cmd,
struct pmf_handlers *h)
{
u32 offset = pmf_next32(cmd);
u32 shift = pmf_next32(cmd);
u32 mask = pmf_next32(cmd);
LOG_PARSE("pmf: write_reg8_slm(offset: %x, shift: %x, mask: %x\n",
offset, shift, mask);
PMF_PARSE_CALL(write_reg8_slm, cmd, h, offset, shift, mask);
}
static int pmf_parser_mask_and_compare(struct pmf_cmd *cmd,
struct pmf_handlers *h)
{
u32 bytes = pmf_next32(cmd);
const void *maskblob = pmf_next_blob(cmd, bytes);
const void *valuesblob = pmf_next_blob(cmd, bytes);
LOG_PARSE("pmf: mask_and_compare(length: %ud ...\n", bytes);
LOG_BLOB("pmf: mask data: \n", maskblob, bytes);
LOG_BLOB("pmf: values data: \n", valuesblob, bytes);
PMF_PARSE_CALL(mask_and_compare, cmd, h,
bytes, maskblob, valuesblob);
}
typedef int (*pmf_cmd_parser_t)(struct pmf_cmd *cmd, struct pmf_handlers *h);
static pmf_cmd_parser_t pmf_parsers[PMF_CMD_COUNT] =
{
NULL,
pmf_parser_write_gpio,
pmf_parser_read_gpio,
pmf_parser_write_reg32,
pmf_parser_read_reg32,
pmf_parser_write_reg16,
pmf_parser_read_reg16,
pmf_parser_write_reg8,
pmf_parser_read_reg8,
pmf_parser_delay,
pmf_parser_wait_reg32,
pmf_parser_wait_reg16,
pmf_parser_wait_reg8,
pmf_parser_read_i2c,
pmf_parser_write_i2c,
pmf_parser_rmw_i2c,
NULL, /* Bogus command */
NULL, /* Shift bytes right: NYI */
NULL, /* Shift bytes left: NYI */
pmf_parser_read_cfg,
pmf_parser_write_cfg,
pmf_parser_rmw_cfg,
pmf_parser_read_i2c_sub,
pmf_parser_write_i2c_sub,
pmf_parser_set_i2c_mode,
pmf_parser_rmw_i2c_sub,
pmf_parser_read_reg32_msrx,
pmf_parser_read_reg16_msrx,
pmf_parser_read_reg8_msrx,
pmf_parser_write_reg32_slm,
pmf_parser_write_reg16_slm,
pmf_parser_write_reg8_slm,
pmf_parser_mask_and_compare,
};
struct pmf_device {
struct list_head link;
struct device_node *node;
struct pmf_handlers *handlers;
struct list_head functions;
struct kref ref;
};
static LIST_HEAD(pmf_devices);
static DEFINE_SPINLOCK(pmf_lock);
static DEFINE_MUTEX(pmf_irq_mutex);
static void pmf_release_device(struct kref *kref)
{
struct pmf_device *dev = container_of(kref, struct pmf_device, ref);
kfree(dev);
}
static inline void pmf_put_device(struct pmf_device *dev)
{
kref_put(&dev->ref, pmf_release_device);
}
static inline struct pmf_device *pmf_get_device(struct pmf_device *dev)
{
kref_get(&dev->ref);
return dev;
}
static inline struct pmf_device *pmf_find_device(struct device_node *np)
{
struct pmf_device *dev;
list_for_each_entry(dev, &pmf_devices, link) {
if (dev->node == np)
return pmf_get_device(dev);
}
return NULL;
}
static int pmf_parse_one(struct pmf_function *func,
struct pmf_handlers *handlers,
void *instdata, struct pmf_args *args)
{
struct pmf_cmd cmd;
u32 ccode;
int count, rc;
cmd.cmdptr = func->data;
cmd.cmdend = func->data + func->length;
cmd.func = func;
cmd.instdata = instdata;
cmd.args = args;
cmd.error = 0;
LOG_PARSE("pmf: func %s, %d bytes, %s...\n",
func->name, func->length,
handlers ? "executing" : "parsing");
/* One subcommand to parse for now */
count = 1;
while(count-- && cmd.cmdptr < cmd.cmdend) {
/* Get opcode */
ccode = pmf_next32(&cmd);
/* Check if we are hitting a command list, fetch new count */
if (ccode == 0) {
count = pmf_next32(&cmd) - 1;
ccode = pmf_next32(&cmd);
}
if (cmd.error) {
LOG_ERROR("pmf: parse error, not enough data\n");
return -ENXIO;
}
if (ccode >= PMF_CMD_COUNT) {
LOG_ERROR("pmf: command code %d unknown !\n", ccode);
return -ENXIO;
}
if (pmf_parsers[ccode] == NULL) {
LOG_ERROR("pmf: no parser for command %d !\n", ccode);
return -ENXIO;
}
rc = pmf_parsers[ccode](&cmd, handlers);
if (rc != 0) {
LOG_ERROR("pmf: parser for command %d returned"
" error %d\n", ccode, rc);
return rc;
}
}
/* We are doing an initial parse pass, we need to adjust the size */
if (handlers == NULL)
func->length = cmd.cmdptr - func->data;
return 0;
}
static int pmf_add_function_prop(struct pmf_device *dev, void *driverdata,
const char *name, u32 *data,
unsigned int length)
{
int count = 0;
struct pmf_function *func = NULL;
DBG("pmf: Adding functions for platform-do-%s\n", name);
while (length >= 12) {
/* Allocate a structure */
func = kzalloc(sizeof(*func), GFP_KERNEL);
if (func == NULL)
goto bail;
kref_init(&func->ref);
INIT_LIST_HEAD(&func->irq_clients);
func->node = dev->node;
func->driver_data = driverdata;
func->name = name;
func->phandle = data[0];
func->flags = data[1];
data += 2;
length -= 8;
func->data = data;
func->length = length;
func->dev = dev;
DBG("pmf: idx %d: flags=%08x, phandle=%08x "
" %d bytes remaining, parsing...\n",
count+1, func->flags, func->phandle, length);
if (pmf_parse_one(func, NULL, NULL, NULL)) {
kfree(func);
goto bail;
}
length -= func->length;
data = (u32 *)(((u8 *)data) + func->length);
list_add(&func->link, &dev->functions);
pmf_get_device(dev);
count++;
}
bail:
DBG("pmf: Added %d functions\n", count);
return count;
}
static int pmf_add_functions(struct pmf_device *dev, void *driverdata)
{
struct property *pp;
#define PP_PREFIX "platform-do-"
const int plen = strlen(PP_PREFIX);
int count = 0;
for_each_property_of_node(dev->node, pp) {
const char *name;
if (strncmp(pp->name, PP_PREFIX, plen) != 0)
continue;
name = pp->name + plen;
if (strlen(name) && pp->length >= 12)
count += pmf_add_function_prop(dev, driverdata, name,
pp->value, pp->length);
}
return count;
}
int pmf_register_driver(struct device_node *np,
struct pmf_handlers *handlers,
void *driverdata)
{
struct pmf_device *dev;
unsigned long flags;
int rc = 0;
if (handlers == NULL)
return -EINVAL;
DBG("pmf: registering driver for node %pOF\n", np);
spin_lock_irqsave(&pmf_lock, flags);
dev = pmf_find_device(np);
spin_unlock_irqrestore(&pmf_lock, flags);
if (dev != NULL) {
DBG("pmf: already there !\n");
pmf_put_device(dev);
return -EBUSY;
}
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (dev == NULL) {
DBG("pmf: no memory !\n");
return -ENOMEM;
}
kref_init(&dev->ref);
dev->node = of_node_get(np);
dev->handlers = handlers;
INIT_LIST_HEAD(&dev->functions);
rc = pmf_add_functions(dev, driverdata);
if (rc == 0) {
DBG("pmf: no functions, disposing.. \n");
of_node_put(np);
kfree(dev);
return -ENODEV;
}
spin_lock_irqsave(&pmf_lock, flags);
list_add(&dev->link, &pmf_devices);
spin_unlock_irqrestore(&pmf_lock, flags);
return 0;
}
EXPORT_SYMBOL_GPL(pmf_register_driver);
struct pmf_function *pmf_get_function(struct pmf_function *func)
{
if (!try_module_get(func->dev->handlers->owner))
return NULL;
kref_get(&func->ref);
return func;
}
EXPORT_SYMBOL_GPL(pmf_get_function);
static void pmf_release_function(struct kref *kref)
{
struct pmf_function *func =
container_of(kref, struct pmf_function, ref);
pmf_put_device(func->dev);
kfree(func);
}
static inline void __pmf_put_function(struct pmf_function *func)
{
kref_put(&func->ref, pmf_release_function);
}
void pmf_put_function(struct pmf_function *func)
{
if (func == NULL)
return;
module_put(func->dev->handlers->owner);
__pmf_put_function(func);
}
EXPORT_SYMBOL_GPL(pmf_put_function);
void pmf_unregister_driver(struct device_node *np)
{
struct pmf_device *dev;
unsigned long flags;
DBG("pmf: unregistering driver for node %pOF\n", np);
spin_lock_irqsave(&pmf_lock, flags);
dev = pmf_find_device(np);
if (dev == NULL) {
DBG("pmf: not such driver !\n");
spin_unlock_irqrestore(&pmf_lock, flags);
return;
}
list_del(&dev->link);
while(!list_empty(&dev->functions)) {
struct pmf_function *func =
list_entry(dev->functions.next, typeof(*func), link);
list_del(&func->link);
__pmf_put_function(func);
}
pmf_put_device(dev);
spin_unlock_irqrestore(&pmf_lock, flags);
}
EXPORT_SYMBOL_GPL(pmf_unregister_driver);
static struct pmf_function *__pmf_find_function(struct device_node *target,
const char *name, u32 flags)
{
struct device_node *actor = of_node_get(target);
struct pmf_device *dev;
struct pmf_function *func, *result = NULL;
char fname[64];
const u32 *prop;
u32 ph;
/*
* Look for a "platform-*" function reference. If we can't find
* one, then we fallback to a direct call attempt
*/
snprintf(fname, 63, "platform-%s", name);
prop = of_get_property(target, fname, NULL);
if (prop == NULL)
goto find_it;
ph = *prop;
if (ph == 0)
goto find_it;
/*
* Ok, now try to find the actor. If we can't find it, we fail,
* there is no point in falling back there
*/
of_node_put(actor);
actor = of_find_node_by_phandle(ph);
if (actor == NULL)
return NULL;
find_it:
dev = pmf_find_device(actor);
if (dev == NULL) {
result = NULL;
goto out;
}
list_for_each_entry(func, &dev->functions, link) {
if (name && strcmp(name, func->name))
continue;
if (func->phandle && target->phandle != func->phandle)
continue;
if ((func->flags & flags) == 0)
continue;
result = func;
break;
}
pmf_put_device(dev);
out:
of_node_put(actor);
return result;
}
int pmf_register_irq_client(struct device_node *target,
const char *name,
struct pmf_irq_client *client)
{
struct pmf_function *func;
unsigned long flags;
spin_lock_irqsave(&pmf_lock, flags);
func = __pmf_find_function(target, name, PMF_FLAGS_INT_GEN);
if (func)
func = pmf_get_function(func);
spin_unlock_irqrestore(&pmf_lock, flags);
if (func == NULL)
return -ENODEV;
/* guard against manipulations of list */
mutex_lock(&pmf_irq_mutex);
if (list_empty(&func->irq_clients))
func->dev->handlers->irq_enable(func);
/* guard against pmf_do_irq while changing list */
spin_lock_irqsave(&pmf_lock, flags);
list_add(&client->link, &func->irq_clients);
spin_unlock_irqrestore(&pmf_lock, flags);
client->func = func;
mutex_unlock(&pmf_irq_mutex);
return 0;
}
EXPORT_SYMBOL_GPL(pmf_register_irq_client);
void pmf_unregister_irq_client(struct pmf_irq_client *client)
{
struct pmf_function *func = client->func;
unsigned long flags;
BUG_ON(func == NULL);
/* guard against manipulations of list */
mutex_lock(&pmf_irq_mutex);
client->func = NULL;
/* guard against pmf_do_irq while changing list */
spin_lock_irqsave(&pmf_lock, flags);
list_del(&client->link);
spin_unlock_irqrestore(&pmf_lock, flags);
if (list_empty(&func->irq_clients))
func->dev->handlers->irq_disable(func);
mutex_unlock(&pmf_irq_mutex);
pmf_put_function(func);
}
EXPORT_SYMBOL_GPL(pmf_unregister_irq_client);
void pmf_do_irq(struct pmf_function *func)
{
unsigned long flags;
struct pmf_irq_client *client;
/* For now, using a spinlock over the whole function. Can be made
* to drop the lock using 2 lists if necessary
*/
spin_lock_irqsave(&pmf_lock, flags);
list_for_each_entry(client, &func->irq_clients, link) {
if (!try_module_get(client->owner))
continue;
client->handler(client->data);
module_put(client->owner);
}
spin_unlock_irqrestore(&pmf_lock, flags);
}
EXPORT_SYMBOL_GPL(pmf_do_irq);
int pmf_call_one(struct pmf_function *func, struct pmf_args *args)
{
struct pmf_device *dev = func->dev;
void *instdata = NULL;
int rc = 0;
DBG(" ** pmf_call_one(%pOF/%s) **\n", dev->node, func->name);
if (dev->handlers->begin)
instdata = dev->handlers->begin(func, args);
rc = pmf_parse_one(func, dev->handlers, instdata, args);
if (dev->handlers->end)
dev->handlers->end(func, instdata);
return rc;
}
EXPORT_SYMBOL_GPL(pmf_call_one);
int pmf_do_functions(struct device_node *np, const char *name,
u32 phandle, u32 fflags, struct pmf_args *args)
{
struct pmf_device *dev;
struct pmf_function *func, *tmp;
unsigned long flags;
int rc = -ENODEV;
spin_lock_irqsave(&pmf_lock, flags);
dev = pmf_find_device(np);
if (dev == NULL) {
spin_unlock_irqrestore(&pmf_lock, flags);
return -ENODEV;
}
list_for_each_entry_safe(func, tmp, &dev->functions, link) {
if (name && strcmp(name, func->name))
continue;
if (phandle && func->phandle && phandle != func->phandle)
continue;
if ((func->flags & fflags) == 0)
continue;
if (pmf_get_function(func) == NULL)
continue;
spin_unlock_irqrestore(&pmf_lock, flags);
rc = pmf_call_one(func, args);
pmf_put_function(func);
spin_lock_irqsave(&pmf_lock, flags);
}
pmf_put_device(dev);
spin_unlock_irqrestore(&pmf_lock, flags);
return rc;
}
EXPORT_SYMBOL_GPL(pmf_do_functions);
struct pmf_function *pmf_find_function(struct device_node *target,
const char *name)
{
struct pmf_function *func;
unsigned long flags;
spin_lock_irqsave(&pmf_lock, flags);
func = __pmf_find_function(target, name, PMF_FLAGS_ON_DEMAND);
if (func)
func = pmf_get_function(func);
spin_unlock_irqrestore(&pmf_lock, flags);
return func;
}
EXPORT_SYMBOL_GPL(pmf_find_function);
int pmf_call_function(struct device_node *target, const char *name,
struct pmf_args *args)
{
struct pmf_function *func = pmf_find_function(target, name);
int rc;
if (func == NULL)
return -ENODEV;
rc = pmf_call_one(func, args);
pmf_put_function(func);
return rc;
}
EXPORT_SYMBOL_GPL(pmf_call_function);
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