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/*
* Support for reading and writing Meta core internal registers.
*
* Copyright (C) 2011 Imagination Technologies Ltd.
*
*/
#include <linux/delay.h>
#include <linux/export.h>
#include <asm/core_reg.h>
#include <asm/global_lock.h>
#include <asm/hwthread.h>
#include <asm/io.h>
#include <asm/metag_mem.h>
#include <asm/metag_regs.h>
#define UNIT_BIT_MASK TXUXXRXRQ_UXX_BITS
#define REG_BIT_MASK TXUXXRXRQ_RX_BITS
#define THREAD_BIT_MASK TXUXXRXRQ_TX_BITS
#define UNIT_SHIFTS TXUXXRXRQ_UXX_S
#define REG_SHIFTS TXUXXRXRQ_RX_S
#define THREAD_SHIFTS TXUXXRXRQ_TX_S
#define UNIT_VAL(x) (((x) << UNIT_SHIFTS) & UNIT_BIT_MASK)
#define REG_VAL(x) (((x) << REG_SHIFTS) & REG_BIT_MASK)
#define THREAD_VAL(x) (((x) << THREAD_SHIFTS) & THREAD_BIT_MASK)
/*
* core_reg_write() - modify the content of a register in a core unit.
* @unit: The unit to be modified.
* @reg: Register number within the unit.
* @thread: The thread we want to access.
* @val: The new value to write.
*
* Check asm/metag_regs.h for a list/defines of supported units (ie: TXUPC_ID,
* TXUTR_ID, etc), and regnums within the units (ie: TXMASKI_REGNUM,
* TXPOLLI_REGNUM, etc).
*/
void core_reg_write(int unit, int reg, int thread, unsigned int val)
{
unsigned long flags;
/* TXUCT_ID has its own memory mapped registers */
if (unit == TXUCT_ID) {
void __iomem *cu_reg = __CU_addr(thread, reg);
metag_out32(val, cu_reg);
return;
}
__global_lock2(flags);
/* wait for ready */
while (!(metag_in32(TXUXXRXRQ) & TXUXXRXRQ_DREADY_BIT))
udelay(10);
/* set the value to write */
metag_out32(val, TXUXXRXDT);
/* set the register to write */
val = UNIT_VAL(unit) | REG_VAL(reg) | THREAD_VAL(thread);
metag_out32(val, TXUXXRXRQ);
/* wait for finish */
while (!(metag_in32(TXUXXRXRQ) & TXUXXRXRQ_DREADY_BIT))
udelay(10);
__global_unlock2(flags);
}
EXPORT_SYMBOL(core_reg_write);
/*
* core_reg_read() - read the content of a register in a core unit.
* @unit: The unit to be modified.
* @reg: Register number within the unit.
* @thread: The thread we want to access.
*
* Check asm/metag_regs.h for a list/defines of supported units (ie: TXUPC_ID,
* TXUTR_ID, etc), and regnums within the units (ie: TXMASKI_REGNUM,
* TXPOLLI_REGNUM, etc).
*/
unsigned int core_reg_read(int unit, int reg, int thread)
{
unsigned long flags;
unsigned int val;
/* TXUCT_ID has its own memory mapped registers */
if (unit == TXUCT_ID) {
void __iomem *cu_reg = __CU_addr(thread, reg);
val = metag_in32(cu_reg);
return val;
}
__global_lock2(flags);
/* wait for ready */
while (!(metag_in32(TXUXXRXRQ) & TXUXXRXRQ_DREADY_BIT))
udelay(10);
/* set the register to read */
val = (UNIT_VAL(unit) | REG_VAL(reg) | THREAD_VAL(thread) |
TXUXXRXRQ_RDnWR_BIT);
metag_out32(val, TXUXXRXRQ);
/* wait for finish */
while (!(metag_in32(TXUXXRXRQ) & TXUXXRXRQ_DREADY_BIT))
udelay(10);
/* read the register value */
val = metag_in32(TXUXXRXDT);
__global_unlock2(flags);
return val;
}
EXPORT_SYMBOL(core_reg_read);
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