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