path: root/arch/powerpc/platforms/powermac/pfunc_core.c

/*
 *
 * FIXME: Properly make this race free with refcounting etc...
 *
 * FIXME: LOCKING !!!
 */

#include <linux/init.h>
#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 <asm/prom.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,</