[linux-sunxi] Re: [RFC PATCH] sunxi: support asymmetric dual rank DRAM on A64/R40
Icenowy Zheng
icenowy at aosc.io
Wed Jun 24 02:34:15 CEST 2020
于 2020年6月24日 GMT+08:00 上午8:28:39, "André Przywara" <andre.przywara at arm.com> 写到:
>On 19/06/2020 13:16, Icenowy Zheng wrote:
>
>Hi Icenowy,
>
>> Previously we have known that R40 has a configuration register for
>its
>> rank 1, which allows different configuration than rank 0. Reverse
>> engineering of newest libdram of A64 from Allwinner shows that A64
>has
>> this register too. It's bit 0 (which enables dual rank in rank 0
>> configuration register) means a dedicated rank size setup is used for
>> rank 1.
>
>Ah! That's a nice discovery, as it probably explains how my Eachlink H6
>TV box works with its asymmetric 3GB DRAM config!
Wait. The configuration of H6 DRAM controller is totally different. it uses
ADDRMAP registers in DRAM controller, instead of specifying parameters
in MCTL_COM part.
>
>> Now, Pine64 scheduled to use a 3GiB LPDDR3 DRAM chip (which has 2GiB
>> rank 0 and 1GiB rank 1) on PinePhone, that makes asymmetric dual rank
>> DRAM support necessary.
>>
>> Add this support. As we have gained knowledge of asymmetric dual
>rank,
>> we can now allow R40 dual rank memory setup to work too.
>>
>> Signed-off-by: Icenowy Zheng <icenowy at aosc.io>
>> ---
>> Testing on R40 boards and A64 single rank boards (e.g. the original
>Pine
>> A64+) is welcomed. I have these boards, but I get too lazy to take
>them
>> out and test them.
>
>I briefly tested this on a Bananapi M2 Berry (R40, 1GB), Pine64 512MB
>and Pine64+ 2GB. All three boot happily into U-Boot, tested the Pine64+
>to the Linux prompt as well.
>
>I will do a proper review shortly.
>
>Thanks for the patch!
>
>Cheers,
>Andre
>
>>
>> .../include/asm/arch-sunxi/dram_sunxi_dw.h | 11 +-
>> arch/arm/mach-sunxi/dram_sunxi_dw.c | 100
>+++++++++++++-----
>> 2 files changed, 84 insertions(+), 27 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/arch-sunxi/dram_sunxi_dw.h
>b/arch/arm/include/asm/arch-sunxi/dram_sunxi_dw.h
>> index a5a7ebde44..e843c14202 100644
>> --- a/arch/arm/include/asm/arch-sunxi/dram_sunxi_dw.h
>> +++ b/arch/arm/include/asm/arch-sunxi/dram_sunxi_dw.h
>> @@ -215,12 +215,17 @@ struct sunxi_mctl_ctl_reg {
>> #define NR_OF_BYTE_LANES (32 / BITS_PER_BYTE)
>> /* The eight data lines (DQn) plus DM, DQS and DQSN */
>> #define LINES_PER_BYTE_LANE (BITS_PER_BYTE + 3)
>> -struct dram_para {
>> +
>> +struct rank_para {
>> u16 page_size;
>> - u8 bus_full_width;
>> - u8 dual_rank;
>> u8 row_bits;
>> u8 bank_bits;
>> +};
>> +
>> +struct dram_para {
>> + u8 dual_rank;
>> + u8 bus_full_width;
>> + struct rank_para ranks[2];
>> const u8 dx_read_delays[NR_OF_BYTE_LANES][LINES_PER_BYTE_LANE];
>> const u8 dx_write_delays[NR_OF_BYTE_LANES][LINES_PER_BYTE_LANE];
>> const u8 ac_delays[31];
>> diff --git a/arch/arm/mach-sunxi/dram_sunxi_dw.c
>b/arch/arm/mach-sunxi/dram_sunxi_dw.c
>> index a462538521..7a40d92349 100644
>> --- a/arch/arm/mach-sunxi/dram_sunxi_dw.c
>> +++ b/arch/arm/mach-sunxi/dram_sunxi_dw.c
>> @@ -349,18 +349,24 @@ static void mctl_set_cr(uint16_t socid, struct
>dram_para *para)
>> #else
>> #error Unsupported DRAM type!
>> #endif
>> - (para->bank_bits == 3 ? MCTL_CR_EIGHT_BANKS :
>MCTL_CR_FOUR_BANKS) |
>> + (para->ranks[0].bank_bits == 3 ? MCTL_CR_EIGHT_BANKS :
>MCTL_CR_FOUR_BANKS) |
>> MCTL_CR_BUS_FULL_WIDTH(para->bus_full_width) |
>> (para->dual_rank ? MCTL_CR_DUAL_RANK : MCTL_CR_SINGLE_RANK)
>|
>> - MCTL_CR_PAGE_SIZE(para->page_size) |
>> - MCTL_CR_ROW_BITS(para->row_bits), &mctl_com->cr);
>> + MCTL_CR_PAGE_SIZE(para->ranks[0].page_size) |
>> + MCTL_CR_ROW_BITS(para->ranks[0].row_bits), &mctl_com->cr);
>>
>> - if (socid == SOCID_R40) {
>> - if (para->dual_rank)
>> - panic("Dual rank memory not supported\n");
>> + if (socid == SOCID_A64 || socid == SOCID_R40) {
>> + writel((para->ranks[1].bank_bits == 3 ? MCTL_CR_EIGHT_BANKS :
>MCTL_CR_FOUR_BANKS) |
>> + MCTL_CR_BUS_FULL_WIDTH(para->bus_full_width) |
>> + (para->dual_rank ? MCTL_CR_DUAL_RANK : MCTL_CR_SINGLE_RANK)
>|
>> + MCTL_CR_PAGE_SIZE(para->ranks[1].page_size) |
>> + MCTL_CR_ROW_BITS(para->ranks[1].row_bits),
>&mctl_com->cr_r1);
>> + }
>>
>> + if (socid == SOCID_R40) {
>> /* Mux pin to A15 address line for single rank memory. */
>> - setbits_le32(&mctl_com->cr_r1, MCTL_CR_R1_MUX_A15);
>> + if (!para->dual_rank)
>> + setbits_le32(&mctl_com->cr_r1, MCTL_CR_R1_MUX_A15);
>> }
>> }
>>
>> @@ -584,35 +590,63 @@ static int mctl_channel_init(uint16_t socid,
>struct dram_para *para)
>> return 0;
>> }
>>
>> -static void mctl_auto_detect_dram_size(uint16_t socid, struct
>dram_para *para)
>> +/*
>> + * Test if memory at offset offset matches memory at a certain base
>> + */
>> +static bool mctl_mem_matches_base(u32 offset, ulong base)
>> +{
>> + /* Try to write different values to RAM at two addresses */
>> + writel(0, base);
>> + writel(0xaa55aa55, base + offset);
>> + dsb();
>> + /* Check if the same value is actually observed when reading back
>*/
>> + return readl(base) ==
>> + readl(base + offset);
>> +}
>> +
>> +static void mctl_auto_detect_dram_size_rank(uint16_t socid, struct
>dram_para *para, ulong base, struct rank_para *rank)
>> {
>> /* detect row address bits */
>> - para->page_size = 512;
>> - para->row_bits = 16;
>> - para->bank_bits = 2;
>> + rank->page_size = 512;
>> + rank->row_bits = 16;
>> + rank->bank_bits = 2;
>> mctl_set_cr(socid, para);
>>
>> - for (para->row_bits = 11; para->row_bits < 16; para->row_bits++)
>> - if (mctl_mem_matches((1 << (para->row_bits + para->bank_bits)) *
>para->page_size))
>> + for (rank->row_bits = 11; rank->row_bits < 16; rank->row_bits++)
>> + if (mctl_mem_matches_base((1 << (rank->row_bits +
>rank->bank_bits)) * rank->page_size, base))
>> break;
>>
>> /* detect bank address bits */
>> - para->bank_bits = 3;
>> + rank->bank_bits = 3;
>> mctl_set_cr(socid, para);
>>
>> - for (para->bank_bits = 2; para->bank_bits < 3; para->bank_bits++)
>> - if (mctl_mem_matches((1 << para->bank_bits) * para->page_size))
>> + for (rank->bank_bits = 2; rank->bank_bits < 3; rank->bank_bits++)
>> + if (mctl_mem_matches_base((1 << rank->bank_bits) *
>rank->page_size, base))
>> break;
>>
>> /* detect page size */
>> - para->page_size = 8192;
>> + rank->page_size = 8192;
>> mctl_set_cr(socid, para);
>>
>> - for (para->page_size = 512; para->page_size < 8192; para->page_size
>*= 2)
>> - if (mctl_mem_matches(para->page_size))
>> + for (rank->page_size = 512; rank->page_size < 8192; rank->page_size
>*= 2)
>> + if (mctl_mem_matches_base(rank->page_size, base))
>> break;
>> }
>>
>> +static unsigned long mctl_calc_rank_size(struct rank_para *rank)
>> +{
>> + return (1UL << (rank->row_bits + rank->bank_bits)) *
>rank->page_size;
>> +}
>> +
>> +static void mctl_auto_detect_dram_size(uint16_t socid, struct
>dram_para *para)
>> +{
>> + mctl_auto_detect_dram_size_rank(socid, para,
>(ulong)CONFIG_SYS_SDRAM_BASE, ¶->ranks[0]);
>> +
>> + if ((socid == SOCID_A64 || socid == SOCID_R40) && para->dual_rank)
>{
>> + mctl_auto_detect_dram_size_rank(socid, para,
>(ulong)CONFIG_SYS_SDRAM_BASE + mctl_calc_rank_size(¶->ranks[0]),
>¶->ranks[1]);
>> + }
>> +}
>> +
>> /*
>> * The actual values used here are taken from Allwinner provided
>boot0
>> * binaries, though they are probably board specific, so would
>likely benefit
>> @@ -691,12 +725,23 @@ unsigned long sunxi_dram_init(void)
>> struct sunxi_mctl_ctl_reg * const mctl_ctl =
>> (struct sunxi_mctl_ctl_reg *)SUNXI_DRAM_CTL0_BASE;
>>
>> + unsigned long size;
>> +
>> struct dram_para para = {
>> .dual_rank = 1,
>> .bus_full_width = 1,
>> - .row_bits = 15,
>> - .bank_bits = 3,
>> - .page_size = 4096,
>> + .ranks = {
>> + {
>> + .row_bits = 15,
>> + .bank_bits = 3,
>> + .page_size = 4096,
>> + },
>> + {
>> + .row_bits = 15,
>> + .bank_bits = 3,
>> + .page_size = 4096,
>> + }
>> + },
>>
>> #if defined(CONFIG_MACH_SUN8I_H3)
>> .dx_read_delays = SUN8I_H3_DX_READ_DELAYS,
>> @@ -765,6 +810,13 @@ unsigned long sunxi_dram_init(void)
>> mctl_auto_detect_dram_size(socid, ¶);
>> mctl_set_cr(socid, ¶);
>>
>> - return (1UL << (para.row_bits + para.bank_bits)) * para.page_size *
>> - (para.dual_rank ? 2 : 1);
>> + size = mctl_calc_rank_size(¶.ranks[0]);
>> + if (socid == SOCID_A64 || socid == SOCID_R40) {
>> + if (para.dual_rank)
>> + size += mctl_calc_rank_size(¶.ranks[1]);
>> + } else if (para.dual_rank) {
>> + size *= 2;
>> + }
>> +
>> + return size;
>> }
>>
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