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spi: hisi-sfc-v3xx: add address mode check 

The address mode is either 3 or 4 for the controller, which is configured
by the firmware and cannot be modified in the OS driver. Get the
firmware configuration and add address mode check in the .supports_op()
to block invalid operations.

Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
Acked-by: John Garry <john.garry@huawei.com>
Link: https://lore.kernel.org/r/1611740450-47975-3-git-send-email-yangyicong@hisilicon.com
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Yicong Yang 2021-01-27 17:40:50 +08:00 committed by Mark Brown
parent 6589daf8bb
commit 6d2386e364
No known key found for this signature in database
GPG Key ID: 24D68B725D5487D0
1 changed files with 24 additions and 1 deletions
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25
drivers/spi/spi-hisi-sfc-v3xx.c
View File

@ -19,6 +19,8 @@
#define HISI_SFC_V3XX_VERSION (0x1f8)
#define HISI_SFC_V3XX_GLB_CFG (0x100)
#define HISI_SFC_V3XX_GLB_CFG_CS0_ADDR_MODE BIT(2)
#define HISI_SFC_V3XX_RAW_INT_STAT (0x120)
#define HISI_SFC_V3XX_INT_STAT (0x124)
#define HISI_SFC_V3XX_INT_MASK (0x128)
@ -75,6 +77,7 @@ struct hisi_sfc_v3xx_host {
void __iomem *regbase;
int max_cmd_dword;
struct completion *completion;
u8 address_mode;
int irq;
};
@ -168,10 +171,18 @@ static int hisi_sfc_v3xx_adjust_op_size(struct spi_mem *mem,
static bool hisi_sfc_v3xx_supports_op(struct spi_mem *mem,
const struct spi_mem_op *op)
{
struct spi_device *spi = mem->spi;
struct hisi_sfc_v3xx_host *host;
host = spi_controller_get_devdata(spi->master);
if (op->data.buswidth > 4 || op->dummy.buswidth > 4 ||
op->addr.buswidth > 4 || op->cmd.buswidth > 4)
return false;
if (op->addr.nbytes != host->address_mode && op->addr.nbytes)
return false;
return spi_mem_default_supports_op(mem, op);
}
@ -416,7 +427,7 @@ static int hisi_sfc_v3xx_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct hisi_sfc_v3xx_host *host;
struct spi_controller *ctlr;
u32 version;
u32 version, glb_config;
int ret;
ctlr = spi_alloc_master(&pdev->dev, sizeof(*host));
@ -463,6 +474,18 @@ static int hisi_sfc_v3xx_probe(struct platform_device *pdev)
ctlr->num_chipselect = 1;
ctlr->mem_ops = &hisi_sfc_v3xx_mem_ops;
/*
* The address mode of the controller is either 3 or 4,
* which is indicated by the address mode bit in
* the global config register. The register is read only
* for the OS driver.
*/
glb_config = readl(host->regbase + HISI_SFC_V3XX_GLB_CFG);
if (glb_config & HISI_SFC_V3XX_GLB_CFG_CS0_ADDR_MODE)
host->address_mode = 4;
else
host->address_mode = 3;
version = readl(host->regbase + HISI_SFC_V3XX_VERSION);
if (version >= 0x351)