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Date: Thu, 20 Aug 2015 16:17:57 +0800
From: Viet Nga Dao <vndao@...era.com>
To: Marek Vasut <marex@...x.de>
Cc: "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
Viet Nga Dao <vndao@...era.com>,
Brian Norris <computersforpeace@...il.com>,
David Woodhouse <dwmw2@...radead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
nga_chi86 <ngachi86@...il.com>
Subject: Re: [PATCH] [PATCH v5] mtd:spi-nor: Add Altera Quad SPI Driver
Sorry for missing to reply the last question
On Thu, Aug 20, 2015 at 4:13 PM, Nga Chi <ngachi86@...il.com> wrote:
> On Thu, Aug 20, 2015 at 4:03 PM, Marek Vasut <marex@...x.de> wrote:
>> On Thursday, August 20, 2015 at 08:55:05 AM, vndao@...era.com wrote:
>>> From: VIET NGA DAO <vndao@...era.com>
>>>
>>> Altera Quad SPI Controller is a soft IP which enables access to
>>> Altera EPCS and EPCQ flash chips. This patch adds driver
>>> for these devices.
>>>
>>> Signed-off-by: VIET NGA DAO <vndao@...era.com>
>>>
>>> ---
>>> v5:
>>> - Remove Micron support
>>> - Add multiple flashes probe failure handle
>>>
>>> v4:
>>> - Add more flash devices support ( EPCQL and Micron)
>>> - Remove redundant messages
>>> - Change EPCQ_OPCODE_ID to NON_EPCS_OPCODE_ID
>>> - Replace get_flash_name to altera_quadspi_scan
>>> - Remove clk related parts
>>> - Remove altera_quadspi_plat
>>> - Change device tree reg name and remove opcode-id
>>>
>>> v3:
>>> - Change altera_epcq driver name to altera_quadspi for more generic name
>>> - Implement flash name searching in altera_quadspi.c instead of spi-nor
>>> - Edit the altra quadspi info table in spi-nor
>>> - Remove wait_til_ready in all read,write, erase, lock, unlock functions
>>> - Merge .h and .c into 1 file
>>>
>>> v2:
>>> - Change to spi_nor structure
>>> - Add lock and unlock functions for spi_nor
>>> - Simplify the altera_epcq_lock function
>>> - Replace reg by compatible in device tree
>>> ---
>>> .../devicetree/bindings/mtd/altera-quadspi.txt | 45 ++
>>> drivers/mtd/spi-nor/Kconfig | 8 +
>>> drivers/mtd/spi-nor/Makefile | 1 +
>>> drivers/mtd/spi-nor/altera-quadspi.c | 557
>>> ++++++++++++++++++++ drivers/mtd/spi-nor/spi-nor.c |
>>> 18 +
>>> 5 files changed, 629 insertions(+), 0 deletions(-)
>>> create mode 100644
>>> Documentation/devicetree/bindings/mtd/altera-quadspi.txt create mode
>>> 100644 drivers/mtd/spi-nor/altera-quadspi.c
>>>
>>> diff --git a/Documentation/devicetree/bindings/mtd/altera-quadspi.txt
>>> b/Documentation/devicetree/bindings/mtd/altera-quadspi.txt new file mode
>>> 100644
>>> index 0000000..e1bcf18
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/mtd/altera-quadspi.txt
>>> @@ -0,0 +1,45 @@
>>> +* MTD Altera QUADSPI driver
>>> +
>>> +Required properties:
>>> +- compatible: Should be "altr,quadspi-1.0"
>>> +- reg: Address and length of the register set for the device. It contains
>>> + the information of registers in the same order as described by reg-names
>>> +- reg-names: Should contain the reg names
>>> + "avl_csr": Should contain the register configuration base address
>>> + "avl_mem": Should contain the data base address
>>> +- #address-cells: Must be <1>.
>>> +- #size-cells: Must be <0>.
>>> +- flash device tree subnode, there must be a node with the following
>>> fields: + - compatible: Should contain the flash name:
>>> + 1. EPCS: epcs16, epcs64, epcs128
>>> + 2. EPCQ: epcq16, epcq32, epcq64, epcq128, epcq256, epcq512, epcq1024
>>> + 3. EPCQ-L: epcql256, epcql512, epcql1024
>>> + - #address-cells: please refer to /mtd/partition.txt
>>> + - #size-cells: please refer to /mtd/partition.txt
>>> + For partitions inside each flash, please refer to /mtd/partition.txt
>>> +
>>> +Example:
>>> +
>>> + quadspi_controller_0: quadspi@...80014a0 {
>>> + compatible = "altr,quadspi-1.0";
>>> + reg = <0x180014a0 0x00000020>,
>>> + <0x14000000 0x04000000>;
>>> + reg-names = "avl_csr", "avl_mem";
>>> + #address-cells = <1>;
>>> + #size-cells = <0>;
>>> + flash0: epcq256@0 {
>>> + compatible = "altr,epcq256";
>>> + #address-cells = <1>;
>>> + #size-cells = <1>;
>>> + partition@0 {
>>> + /* 16 MB for raw data. */
>>> + label = "EPCQ Flash 0 raw data";
>>> + reg = <0x0 0x1000000>;
>>> + };
>>> + partition@...0000 {
>>> + /* 16 MB for jffs2 data. */
>>> + label = "EPCQ Flash 0 JFFS 2";
>>> + reg = <0x1000000 0x1000000>;
>>> + };
>>
>> IIRC, encoding partitions into OF is deprecated (and it shouldn't be
>> part of the example anyway, so please remove this bit).
>>
>>> + };
>>> + }; //end quadspi@...80014a0 (quadspi_controller_0)
>>
>> Remove this incorrect comment.
>>
>>
>> [...]
>>
>
>Do you mean the partition part below should not be in example?
> partition@0 {
> /* 16 MB for raw data. */
> label = "EPCQ Flash 0 raw data";
> reg = <0x0 0x1000000>;
> };
> partition@...0000 {
> /* 16 MB for jffs2 data. */
> label = "EPCQ Flash 0 JFFS 2";
> reg = <0x1000000 0x1000000>;
> };
>
>>> +static struct flash_device flash_devices[] = {
>>> + FLASH_ID("epcs16", EPCS_OPCODE_ID, 0x14),
>>> + FLASH_ID("epcs64", EPCS_OPCODE_ID, 0x16),
>>> + FLASH_ID("epcs128", EPCS_OPCODE_ID, 0x18),
>>> +
>>> + FLASH_ID("epcq16", NON_EPCS_OPCODE_ID, 0x15),
>>> + FLASH_ID("epcq32", NON_EPCS_OPCODE_ID, 0x16),
>>> + FLASH_ID("epcq64", NON_EPCS_OPCODE_ID, 0x17),
>>> + FLASH_ID("epcq128", NON_EPCS_OPCODE_ID, 0x18),
>>> + FLASH_ID("epcq256", NON_EPCS_OPCODE_ID, 0x19),
>>> + FLASH_ID("epcq512", NON_EPCS_OPCODE_ID, 0x20),
>>> + FLASH_ID("epcq1024", NON_EPCS_OPCODE_ID, 0x21),
>>> +
>>> + FLASH_ID("epcql256", NON_EPCS_OPCODE_ID, 0x19),
>>> + FLASH_ID("epcql512", NON_EPCS_OPCODE_ID, 0x20),
>>> + FLASH_ID("epcql1024", NON_EPCS_OPCODE_ID, 0x21),
>>> +
>>> +};
>>
>> I think it'd be better to wait until the IP block is fixed and can
>> issue READID correctly.
>>
>
> The hardware IP fix will take time while there are lot of customer are
> waiting for this driver. That is why we decided to upstream the
> driver. If the hardware fix, there might not need to have any changes
> in driver to support or if yes, it will be just minor.
>
>>> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
>>> index 14a5d23..2ab7279 100644
>>> --- a/drivers/mtd/spi-nor/spi-nor.c
>>> +++ b/drivers/mtd/spi-nor/spi-nor.c
>>> @@ -687,6 +687,24 @@ static const struct spi_device_id spi_nor_ids[] = {
>>> { "cat25c09", CAT25_INFO( 128, 8, 32, 2, SPI_NOR_NO_ERASE |
>>> SPI_NOR_NO_FR) }, { "cat25c17", CAT25_INFO( 256, 8, 32, 2,
>>> SPI_NOR_NO_ERASE | SPI_NOR_NO_FR) }, { "cat25128", CAT25_INFO(2048, 8, 64,
>>> 2, SPI_NOR_NO_ERASE | SPI_NOR_NO_FR) }, +
>>> + /* Altera EPCQ/EPCS Flashes are non-JEDEC */
>>
>> Are they really ? Last time I checked on CV SoC, I was able to read their
>> JEDEC ID just fine ; though it's true I used that EPCS core.
>>
Altera EPCS flash is non-jedec device. And this new controller is not
EPCS controller. If you look at the documentation i sent in another
email, they are not the same.
>>> + { "epcs16", INFO(0, 0, 0x10000, 32, 0) },
>>> + { "epcs64", INFO(0, 0, 0x10000, 128, 0) },
>>> + { "epcs128", INFO(0, 0, 0x40000, 256, 0) },
>>> +
>>> + { "epcq16", INFO(0, 0, 0x10000, 32, 0) },
>>> + { "epcq32", INFO(0, 0, 0x10000, 64, 0) },
>>> + { "epcq64", INFO(0, 0, 0x10000, 128, 0) },
>>> + { "epcq128", INFO(0, 0, 0x10000, 256, 0) },
>>> + { "epcq256", INFO(0, 0, 0x10000, 512, 0) },
>>> + { "epcq512", INFO(0, 0, 0x10000, 1024, 0) },
>>> + { "epcq1024", INFO(0, 0, 0x10000, 2048, 0) },
>>> +
>>> + { "epcql256", INFO(0, 0, 0x10000, 512, 0) },
>>> + { "epcql512", INFO(0, 0, 0x10000, 1024, 0) },
>>> + { "epcql1024", INFO(0, 0, 0x10000, 2048, 0) },
>>> +
>>> { },
>>> };
>
>
>
> --
> Nga
--
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