66 lines
1.5 KiB
C
66 lines
1.5 KiB
C
#include <stdint.h>
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#include <kernel/hardware/mpu.h>
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/* check_sh3 - Detecting sh3-based MPU */
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static mpu_t check_sh3(uint16_t tplcr)
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{
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if (tplcr == 0x0fff)
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return (MPU_SH7337);
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if (tplcr == 0x00ff)
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return (MPU_SH7355);
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return (MPU_UNKNOWN);
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}
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/* check_sh3 - Detecting sh4-based MPU */
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static mpu_t check_sh4(void)
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{
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volatile uint32_t *pvr = (void *)0xff000030;
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volatile uint32_t *prr = (void *)0xff000044;
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uint32_t product;
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if ((*pvr & 0xffffff00) != 0x10300b00)
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return (MPU_UNKNOWN);
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product = *prr & 0xfffffff0;
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if (product == 0x00002c00)
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return (MPU_SH7305);
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if (product == 0x00002200)
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return (MPU_SH7724);
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return (MPU_UNKNOWN);
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}
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//
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// get_mpu()
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//
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// Return the MPU identifier of the calculator.
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// Thanks to SimonLothar and Lephenixnoir for this function
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// and related information.
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//
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// Processor version register (PVR) and product control register (PRR)
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// hold information about the MPU version, they but are only accessible on
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// SH-4-based MPUs.
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// To detect SH-3-based MPUs, this function uses port L control register
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// (PLCR), whose bits 8 to 15 cannot be set with SH7337 where bits 8 to 11
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// can be set with SH7355.
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//
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// Additionally, the CPU core ID register (CPIDR) at 0xff000048 returns 1
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// on SH7305.
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//
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mpu_t mpu_get(void)
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{
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volatile uint16_t *plcr = (void *)0xa4000114;
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uint16_t splcr;
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uint16_t tplcr;
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mpu_t mpu;
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// Check port L control register.
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splcr = *plcr;
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*plcr = 0xffff;
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tplcr = *plcr;
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*plcr = splcr;
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mpu = check_sh3(tplcr);
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if (mpu != MPU_UNKNOWN)
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return (mpu);
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return (check_sh4());
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}
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