diff options
| author | Icenowy Zheng <icenowy@aosc.xyz> | 2016-06-20 12:48:38 +0800 |
|---|---|---|
| committer | Boris Brezillon <boris.brezillon@free-electrons.com> | 2016-07-11 08:40:18 +0200 |
| commit | ab9d6a783544bbf8834277f8409048ddc35712ed (patch) | |
| tree | 524a1bb4393e9b6ae3cbaea5e0a0e4d882fb2154 /drivers/mtd/nand/sunxi_nand.c | |
| parent | 7f657279a6de28573f13420840b2de3e04131d04 (diff) | |
mtd: nand: sunxi: add reset line support
The NAND controller on some sun8i chips needs its reset line to be
deasserted before they can enter working state.
Signed-off-by: Icenowy Zheng <icenowy@aosc.xyz>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Diffstat (limited to 'drivers/mtd/nand/sunxi_nand.c')
| -rw-r--r-- | drivers/mtd/nand/sunxi_nand.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/mtd/nand/sunxi_nand.c b/drivers/mtd/nand/sunxi_nand.c index f582fe41d61d..d2b7457d447f 100644 --- a/drivers/mtd/nand/sunxi_nand.c +++ b/drivers/mtd/nand/sunxi_nand.c @@ -39,6 +39,7 @@ #include <linux/gpio.h> #include <linux/interrupt.h> #include <linux/iopoll.h> +#include <linux/reset.h> #define NFC_REG_CTL 0x0000 #define NFC_REG_ST 0x0004 @@ -270,6 +271,7 @@ struct sunxi_nfc { void __iomem *regs; struct clk *ahb_clk; struct clk *mod_clk; + struct reset_control *reset; unsigned long assigned_cs; unsigned long clk_rate; struct list_head chips; @@ -2209,15 +2211,27 @@ static int sunxi_nfc_probe(struct platform_device *pdev) if (ret) goto out_ahb_clk_unprepare; + nfc->reset = devm_reset_control_get_optional(dev, "ahb"); + if (!IS_ERR(nfc->reset)) { + ret = reset_control_deassert(nfc->reset); + if (ret) { + dev_err(dev, "reset err %d\n", ret); + goto out_mod_clk_unprepare; + } + } else if (PTR_ERR(nfc->reset) != -ENOENT) { + ret = PTR_ERR(nfc->reset); + goto out_mod_clk_unprepare; + } + ret = sunxi_nfc_rst(nfc); if (ret) - goto out_mod_clk_unprepare; + goto out_ahb_reset_reassert; writel(0, nfc->regs + NFC_REG_INT); ret = devm_request_irq(dev, irq, sunxi_nfc_interrupt, 0, "sunxi-nand", nfc); if (ret) - goto out_mod_clk_unprepare; + goto out_ahb_reset_reassert; nfc->dmac = dma_request_slave_channel(dev, "rxtx"); if (nfc->dmac) { @@ -2247,6 +2261,9 @@ static int sunxi_nfc_probe(struct platform_device *pdev) out_release_dmac: if (nfc->dmac) dma_release_channel(nfc->dmac); +out_ahb_reset_reassert: + if (!IS_ERR(nfc->reset)) + reset_control_assert(nfc->reset); out_mod_clk_unprepare: clk_disable_unprepare(nfc->mod_clk); out_ahb_clk_unprepare: @@ -2260,6 +2277,10 @@ static int sunxi_nfc_remove(struct platform_device *pdev) struct sunxi_nfc *nfc = platform_get_drvdata(pdev); sunxi_nand_chips_cleanup(nfc); + + if (!IS_ERR(nfc->reset)) + reset_control_assert(nfc->reset); + if (nfc->dmac) dma_release_channel(nfc->dmac); clk_disable_unprepare(nfc->mod_clk); |