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| author | BALATON Zoltan <balaton@eik.bme.hu> | 2022-09-24 14:27:59 +0200 |
|---|---|---|
| committer | Daniel Henrique Barboza <danielhb413@gmail.com> | 2022-10-17 16:15:09 -0300 |
| commit | ea74acee988e5849ec5b7aa89edc3e676b66d2c4 (patch) | |
| tree | 2bf25a8f95c19393397a779c0f663d882d7d3c6f /hw | |
| parent | 17221012b19a2100335bb7993befd9b38f944f3f (diff) | |
| download | qemu-ea74acee988e5849ec5b7aa89edc3e676b66d2c4.zip qemu-ea74acee988e5849ec5b7aa89edc3e676b66d2c4.tar.gz qemu-ea74acee988e5849ec5b7aa89edc3e676b66d2c4.tar.bz2 | |
ppc440_sdram: Implement enable bit in the DDR2 SDRAM controller
To allow removing the do_init hack we need to improve the DDR2 SDRAM
controller model to handle the enable/disable bit that it ignored so
far.
Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <f8900aadb1a4426a6444741e6876c898b3b77f7b.1664021647.git.balaton@eik.bme.hu>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Diffstat (limited to 'hw')
| -rw-r--r-- | hw/ppc/ppc440_uc.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/hw/ppc/ppc440_uc.c b/hw/ppc/ppc440_uc.c index 900b7ab..3fbfe4a 100644 --- a/hw/ppc/ppc440_uc.c +++ b/hw/ppc/ppc440_uc.c @@ -485,6 +485,7 @@ void ppc4xx_sdr_init(CPUPPCState *env) /* SDRAM controller */ typedef struct ppc440_sdram_t { uint32_t addr; + uint32_t mcopt2; int nbanks; Ppc4xxSdramBank bank[4]; } ppc440_sdram_t; @@ -600,7 +601,7 @@ static void sdram_map_bcr(ppc440_sdram_t *sdram) int i; for (i = 0; i < sdram->nbanks; i++) { - if (sdram->bank[i].size != 0) { + if (sdram->bank[i].size) { sdram_set_bcr(sdram, i, sdram_bcr(sdram->bank[i].base, sdram->bank[i].size), 1); } else { @@ -609,6 +610,17 @@ static void sdram_map_bcr(ppc440_sdram_t *sdram) } } +static void sdram_unmap_bcr(ppc440_sdram_t *sdram) +{ + int i; + + for (i = 0; i < sdram->nbanks; i++) { + if (sdram->bank[i].size) { + sdram_set_bcr(sdram, i, sdram->bank[i].bcr & ~1, 0); + } + } +} + static uint32_t dcr_read_sdram(void *opaque, int dcrn) { ppc440_sdram_t *sdram = opaque; @@ -640,7 +652,7 @@ static uint32_t dcr_read_sdram(void *opaque, int dcrn) ret = 0x80000000; break; case 0x21: /* SDRAM_MCOPT2 */ - ret = 0x08000000; + ret = sdram->mcopt2; break; case 0x40: /* SDRAM_MB0CF */ ret = 0x00008001; @@ -662,6 +674,8 @@ static uint32_t dcr_read_sdram(void *opaque, int dcrn) return ret; } +#define SDRAM_DDR2_MCOPT2_DCEN BIT(27) + static void dcr_write_sdram(void *opaque, int dcrn, uint32_t val) { ppc440_sdram_t *sdram = opaque; @@ -684,6 +698,21 @@ static void dcr_write_sdram(void *opaque, int dcrn, uint32_t val) switch (sdram->addr) { case 0x00: /* B0CR */ break; + case 0x21: /* SDRAM_MCOPT2 */ + if (!(sdram->mcopt2 & SDRAM_DDR2_MCOPT2_DCEN) && + (val & SDRAM_DDR2_MCOPT2_DCEN)) { + trace_ppc4xx_sdram_enable("enable"); + /* validate all RAM mappings */ + sdram_map_bcr(sdram); + sdram->mcopt2 |= SDRAM_DDR2_MCOPT2_DCEN; + } else if ((sdram->mcopt2 & SDRAM_DDR2_MCOPT2_DCEN) && + !(val & SDRAM_DDR2_MCOPT2_DCEN)) { + trace_ppc4xx_sdram_enable("disable"); + /* invalidate all RAM mappings */ + sdram_unmap_bcr(sdram); + sdram->mcopt2 &= ~SDRAM_DDR2_MCOPT2_DCEN; + } + break; default: break; } @@ -698,6 +727,7 @@ static void sdram_reset(void *opaque) ppc440_sdram_t *sdram = opaque; sdram->addr = 0; + sdram->mcopt2 = SDRAM_DDR2_MCOPT2_DCEN; } void ppc440_sdram_init(CPUPPCState *env, int nbanks, |