Hello Jamin,
On 7/26/24 08:00, Jamin Lin wrote:
Hi Cedric,
I will looked at v2. Sorry for the late reply, I was on PTO.
Thanks,
C.
Subject: Re: [PATCH v1 04/15] hw/i2c/aspeed: support discontinuous register
memory region of I2C bus
On 7/18/24 11:44, Jamin Lin wrote:
Hi Cedric,
Subject: Re: [PATCH v1 04/15] hw/i2c/aspeed: support discontinuous
register memory region of I2C bus
On 7/18/24 08:49, Jamin Lin wrote:
It only support continuous register memory region for all I2C bus.
However, the register address of all I2c bus are discontinuous for
AST2700.
Ex: the register address of I2C bus for ast2700 as following.
0x100 - 0x17F: Device 0
0x200 - 0x27F: Device 1
0x300 - 0x37F: Device 2
0x400 - 0x47F: Device 3
0x500 - 0x57F: Device 4
0x600 - 0x67F: Device 5
0x700 - 0x77F: Device 6
0x800 - 0x87F: Device 7
0x900 - 0x97F: Device 8
0xA00 - 0xA7F: Device 9
0xB00 - 0xB7F: Device 10
0xC00 - 0xC7F: Device 11
0xD00 - 0xD7F: Device 12
0xE00 - 0xE7F: Device 13
0xF00 – 0xF7F: Device 14
0x1000 – 0x107F: Device 15
Introduce a new class attribute to make user set each I2C bus gap size.
Update formula to create all I2C bus register memory regions.
I don't think this is necessary to model. Could we simply increase
tge register MMIO size for the AST2700 bus model and rely on the
memops to catch invalid register offsets ?
Thanks for your review and suggestion.
Sorry, I am not very clearly understand your comments.
Could you please describe it more detail?
Thanks-Jamin
I don't think you need to introduce a gap size class attribute.
Setting :
aic->reg_size = 0x100; /* size + gap */
in aspeed_2700_i2c_class_init() should be enough.
Sorry reply you late.
The address space of I2C bus and pool buffer are as following
0x100 - 0x17F: device1_reg 0x1a0 - 0x1bf: device1_buf
0x200 - 0x27F: device2_reg 0x2a0 - 0x2bf:device2_buf
0x300 - 0x37F: device3_reg 0x3a0 -0x3bf: device3_buf
I tried to set the aic->reg_size 0x100 and aic->pool_size 0x100.
And the memory regions of I2c bus became as following.
0x100-0x1ff aspeed.i2c.bus.0 0x1a0-0x29f aspeed.i2c.bus.0.pool
0x200-0x2ff aspeed.i2c.bus.1 0x2a0-0x39f aspeed.i2c.bus.1.pool
0x300-0x3ff aspeed.i2c.bus.2 0x3a0-0x49f aspeed.i2c.bus.2.pool
0000000014c0f000-0000000014c10fff (prio 0, i/o): aspeed.i2c
0000000014c0f100-0000000014c0f1ff (prio 0, i/o): aspeed.i2c.bus.0
0000000014c0f1a0-0000000014c0f29f (prio 0, i/o): aspeed.i2c.bus.0.pool
0000000014c0f200-0000000014c0f2ff (prio 0, i/o): aspeed.i2c.bus.1
0000000014c0f2a0-0000000014c0f39f (prio 0, i/o): aspeed.i2c.bus.1.pool
0000000014c0f300-0000000014c0f3ff (prio 0, i/o): aspeed.i2c.bus.2
0000000014c0f3a0-0000000014c0f49f (prio 0, i/o): aspeed.i2c.bus.2.pool
The memory region of aspeed.i2c.bus.0 (0x100-0x1ff) occupied
aspeed.i2c.bus.0.pool address space(0x1a0-0x1bf).
And the memory region of aspeed.i2c.bus.0.pool (0x1a0-0x29f) occupied
aspeed.i2c.bus.1 address space(0x200-0x27F)
That was why I created reg_gap_size and pool_gap_size to fix this issue.
Do you have any suggestion?
Thanks-Jamin
Thanks,
C.
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