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mtd: atmel_nand: check NFC busy flag by HSMC_SR instead of NFC cmd regs
Currently the driver read NFC command registers to get NFC busy flag. Actually this flag also can be get by reading HSMC_SR register. Use the read NFC command registers need mapping a huge memory region. To save the mapped memory region, we change to check NFC busy flag by reading HSMC_SR register. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Josh Wu <josh.wu@atmel.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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393d23c4e2
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2 changed files with 3 additions and 3 deletions
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@ -1752,11 +1752,10 @@ static int nfc_send_command(struct atmel_nand_host *host,
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cmd, addr, cycle0);
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timeout = jiffies + msecs_to_jiffies(NFC_TIME_OUT_MS);
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while (nfc_cmd_readl(NFCADDR_CMD_NFCBUSY, host->nfc->base_cmd_regs)
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& NFCADDR_CMD_NFCBUSY) {
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while (nfc_readl(host->nfc->hsmc_regs, SR) & NFC_SR_BUSY) {
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if (time_after(jiffies, timeout)) {
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dev_err(host->dev,
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"Time out to wait CMD_NFCBUSY ready!\n");
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"Time out to wait for NFC ready!\n");
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return -ETIMEDOUT;
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}
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}
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@ -35,6 +35,7 @@
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#define NFC_CTRL_DISABLE (1 << 1)
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#define ATMEL_HSMC_NFC_SR 0x08 /* NFC Status Register */
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#define NFC_SR_BUSY (1 << 8)
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#define NFC_SR_XFR_DONE (1 << 16)
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#define NFC_SR_CMD_DONE (1 << 17)
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#define NFC_SR_DTOE (1 << 20)
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