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mtd: rawnand: sunxi: Add a platform data structure 

Before the introduction of A33 NAND DMA support, let's use a platform
data structure for parameters that will differ. Right now, there is
only one compatible with one data structure.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
hifive-unleashed-5.2
Miquel Raynal 2019-04-08 09:41:45 +02:00
parent aee02f82e1
commit a760e77d75
1 changed files with 32 additions and 5 deletions
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37
drivers/mtd/nand/raw/sunxi_nand.c
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@ -42,7 +42,7 @@
#define NFC_REG_CMD 0x0024
#define NFC_REG_RCMD_SET 0x0028
#define NFC_REG_WCMD_SET 0x002C
#define NFC_REG_IO_DATA 0x0030
#define NFC_REG_A10_IO_DATA 0x0030
#define NFC_REG_ECC_CTL 0x0034
#define NFC_REG_ECC_ST 0x0038
#define NFC_REG_DEBUG 0x003C
@ -200,6 +200,18 @@ static inline struct sunxi_nand_chip *to_sunxi_nand(struct nand_chip *nand)
return container_of(nand, struct sunxi_nand_chip, nand);
}
/*
* NAND Controller capabilities structure: stores NAND controller capabilities
* for distinction between compatible strings.
*
* @reg_io_data: I/O data register
* @dma_maxburst: DMA maxburst
*/
struct sunxi_nfc_caps {
unsigned int reg_io_data;
unsigned int dma_maxburst;
};
/**
* struct sunxi_nfc - stores sunxi NAND controller information
*
@ -228,6 +240,7 @@ struct sunxi_nfc {
struct list_head chips;
struct completion complete;
struct dma_chan *dmac;
const struct sunxi_nfc_caps *caps;
};
static inline struct sunxi_nfc *to_sunxi_nfc(struct nand_controller *ctrl)
@ -2087,6 +2100,12 @@ static int sunxi_nfc_probe(struct platform_device *pdev)
goto out_mod_clk_unprepare;
}
nfc->caps = of_device_get_match_data(&pdev->dev);
if (!nfc->caps) {
ret = -EINVAL;
goto out_ahb_reset_reassert;
}
ret = sunxi_nfc_rst(nfc);
if (ret)
goto out_ahb_reset_reassert;
@ -2101,12 +2120,12 @@ static int sunxi_nfc_probe(struct platform_device *pdev)
if (nfc->dmac) {
struct dma_slave_config dmac_cfg = { };
dmac_cfg.src_addr = r->start + NFC_REG_IO_DATA;
dmac_cfg.src_addr = r->start + nfc->caps->reg_io_data;
dmac_cfg.dst_addr = dmac_cfg.src_addr;
dmac_cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
dmac_cfg.dst_addr_width = dmac_cfg.src_addr_width;
dmac_cfg.src_maxburst = 4;
dmac_cfg.dst_maxburst = 4;
dmac_cfg.src_maxburst = nfc->caps->dma_maxburst;
dmac_cfg.dst_maxburst = nfc->caps->dma_maxburst;
dmaengine_slave_config(nfc->dmac, &dmac_cfg);
} else {
dev_warn(dev, "failed to request rxtx DMA channel\n");
@ -2151,8 +2170,16 @@ static int sunxi_nfc_remove(struct platform_device *pdev)
return 0;
}
static const struct sunxi_nfc_caps sunxi_nfc_a10_caps = {
.reg_io_data = NFC_REG_A10_IO_DATA,
.dma_maxburst = 4,
};
static const struct of_device_id sunxi_nfc_ids[] = {
{ .compatible = "allwinner,sun4i-a10-nand" },
{
.compatible = "allwinner,sun4i-a10-nand",
.data = &sunxi_nfc_a10_caps,
},
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, sunxi_nfc_ids);