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nand: omap2: Remove horrible ifdefs to fix module probe
The current code abuses ifdefs to determine if the selected ECC scheme is supported by the running kernel. As a result the code is hard to read, and it also fails to load as a module. This commit removes all the ifdefs and instead introduces a function omap2_nand_ecc_check() to check if the ECC is supported by using IS_ENABLED(CONFIG_xxx). Since IS_ENABLED() is true when a config is =y or =m, this change fixes the module so it can be loaded with no issues. Acked-by: Roger Quadros <rogerq@ti.com> Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
parent
2a960cce03
commit
93af53b863
@ -136,7 +136,6 @@
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#define BADBLOCK_MARKER_LENGTH 2
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#ifdef CONFIG_MTD_NAND_OMAP_BCH
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static u_char bch16_vector[] = {0xf5, 0x24, 0x1c, 0xd0, 0x61, 0xb3, 0xf1, 0x55,
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0x2e, 0x2c, 0x86, 0xa3, 0xed, 0x36, 0x1b, 0x78,
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0x48, 0x76, 0xa9, 0x3b, 0x97, 0xd1, 0x7a, 0x93,
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@ -144,7 +143,6 @@ static u_char bch16_vector[] = {0xf5, 0x24, 0x1c, 0xd0, 0x61, 0xb3, 0xf1, 0x55,
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static u_char bch8_vector[] = {0xf3, 0xdb, 0x14, 0x16, 0x8b, 0xd2, 0xbe, 0xcc,
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0xac, 0x6b, 0xff, 0x99, 0x7b};
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static u_char bch4_vector[] = {0x00, 0x6b, 0x31, 0xdd, 0x41, 0xbc, 0x10};
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#endif
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/* oob info generated runtime depending on ecc algorithm and layout selected */
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static struct nand_ecclayout omap_oobinfo;
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@ -1292,7 +1290,6 @@ static int __maybe_unused omap_calculate_ecc_bch(struct mtd_info *mtd,
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return 0;
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}
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#ifdef CONFIG_MTD_NAND_OMAP_BCH
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/**
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* erased_sector_bitflips - count bit flips
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* @data: data sector buffer
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@ -1593,33 +1590,71 @@ static int omap_read_page_bch(struct mtd_info *mtd, struct nand_chip *chip,
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/**
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* is_elm_present - checks for presence of ELM module by scanning DT nodes
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* @omap_nand_info: NAND device structure containing platform data
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* @bch_type: 0x0=BCH4, 0x1=BCH8, 0x2=BCH16
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*/
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static int is_elm_present(struct omap_nand_info *info,
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struct device_node *elm_node, enum bch_ecc bch_type)
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static bool is_elm_present(struct omap_nand_info *info,
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struct device_node *elm_node)
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{
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struct platform_device *pdev;
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struct nand_ecc_ctrl *ecc = &info->nand.ecc;
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int err;
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/* check whether elm-id is passed via DT */
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if (!elm_node) {
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pr_err("nand: error: ELM DT node not found\n");
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return -ENODEV;
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return false;
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}
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pdev = of_find_device_by_node(elm_node);
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/* check whether ELM device is registered */
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if (!pdev) {
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pr_err("nand: error: ELM device not found\n");
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return -ENODEV;
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return false;
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}
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/* ELM module available, now configure it */
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info->elm_dev = &pdev->dev;
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err = elm_config(info->elm_dev, bch_type,
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(info->mtd.writesize / ecc->size), ecc->size, ecc->bytes);
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return err;
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return true;
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}
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static bool omap2_nand_ecc_check(struct omap_nand_info *info,
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struct omap_nand_platform_data *pdata)
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{
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bool ecc_needs_bch, ecc_needs_omap_bch, ecc_needs_elm;
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switch (info->ecc_opt) {
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case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
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case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
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ecc_needs_omap_bch = false;
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ecc_needs_bch = true;
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ecc_needs_elm = false;
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break;
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case OMAP_ECC_BCH4_CODE_HW:
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case OMAP_ECC_BCH8_CODE_HW:
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case OMAP_ECC_BCH16_CODE_HW:
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ecc_needs_omap_bch = true;
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ecc_needs_bch = false;
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ecc_needs_elm = true;
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break;
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default:
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ecc_needs_omap_bch = false;
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ecc_needs_bch = false;
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ecc_needs_elm = false;
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break;
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}
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if (ecc_needs_bch && !IS_ENABLED(CONFIG_MTD_NAND_ECC_BCH)) {
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dev_err(&info->pdev->dev,
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"CONFIG_MTD_NAND_ECC_BCH not enabled\n");
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return false;
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}
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if (ecc_needs_omap_bch && !IS_ENABLED(CONFIG_MTD_NAND_OMAP_BCH)) {
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dev_err(&info->pdev->dev,
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"CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
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return false;
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}
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if (ecc_needs_elm && !is_elm_present(info, pdata->elm_of_node)) {
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dev_err(&info->pdev->dev, "ELM not available\n");
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return false;
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}
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return true;
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}
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#endif /* CONFIG_MTD_NAND_ECC_BCH */
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static int omap_nand_probe(struct platform_device *pdev)
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{
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@ -1797,6 +1832,11 @@ static int omap_nand_probe(struct platform_device *pdev)
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goto return_error;
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}
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if (!omap2_nand_ecc_check(info, pdata)) {
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err = -EINVAL;
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goto return_error;
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}
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/* populate MTD interface based on ECC scheme */
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ecclayout = &omap_oobinfo;
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switch (info->ecc_opt) {
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@ -1829,7 +1869,6 @@ static int omap_nand_probe(struct platform_device *pdev)
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break;
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case OMAP_ECC_BCH4_CODE_HW_DETECTION_SW:
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#ifdef CONFIG_MTD_NAND_ECC_BCH
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pr_info("nand: using OMAP_ECC_BCH4_CODE_HW_DETECTION_SW\n");
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nand_chip->ecc.mode = NAND_ECC_HW;
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nand_chip->ecc.size = 512;
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@ -1861,14 +1900,8 @@ static int omap_nand_probe(struct platform_device *pdev)
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err = -EINVAL;
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}
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break;
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#else
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pr_err("nand: error: CONFIG_MTD_NAND_ECC_BCH not enabled\n");
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err = -EINVAL;
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goto return_error;
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#endif
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case OMAP_ECC_BCH4_CODE_HW:
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#ifdef CONFIG_MTD_NAND_OMAP_BCH
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pr_info("nand: using OMAP_ECC_BCH4_CODE_HW ECC scheme\n");
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nand_chip->ecc.mode = NAND_ECC_HW;
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nand_chip->ecc.size = 512;
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@ -1890,21 +1923,15 @@ static int omap_nand_probe(struct platform_device *pdev)
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/* reserved marker already included in ecclayout->eccbytes */
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ecclayout->oobfree->offset =
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ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
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/* This ECC scheme requires ELM H/W block */
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if (is_elm_present(info, pdata->elm_of_node, BCH4_ECC) < 0) {
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pr_err("nand: error: could not initialize ELM\n");
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err = -ENODEV;
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err = elm_config(info->elm_dev, BCH4_ECC,
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info->mtd.writesize / nand_chip->ecc.size,
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nand_chip->ecc.size, nand_chip->ecc.bytes);
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if (err < 0)
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goto return_error;
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}
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break;
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#else
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pr_err("nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
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err = -EINVAL;
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goto return_error;
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#endif
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case OMAP_ECC_BCH8_CODE_HW_DETECTION_SW:
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#ifdef CONFIG_MTD_NAND_ECC_BCH
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pr_info("nand: using OMAP_ECC_BCH8_CODE_HW_DETECTION_SW\n");
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nand_chip->ecc.mode = NAND_ECC_HW;
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nand_chip->ecc.size = 512;
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@ -1937,14 +1964,8 @@ static int omap_nand_probe(struct platform_device *pdev)
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goto return_error;
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}
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break;
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#else
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pr_err("nand: error: CONFIG_MTD_NAND_ECC_BCH not enabled\n");
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err = -EINVAL;
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goto return_error;
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#endif
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case OMAP_ECC_BCH8_CODE_HW:
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#ifdef CONFIG_MTD_NAND_OMAP_BCH
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pr_info("nand: using OMAP_ECC_BCH8_CODE_HW ECC scheme\n");
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nand_chip->ecc.mode = NAND_ECC_HW;
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nand_chip->ecc.size = 512;
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@ -1956,12 +1977,13 @@ static int omap_nand_probe(struct platform_device *pdev)
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nand_chip->ecc.calculate = omap_calculate_ecc_bch;
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nand_chip->ecc.read_page = omap_read_page_bch;
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nand_chip->ecc.write_page = omap_write_page_bch;
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/* This ECC scheme requires ELM H/W block */
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err = is_elm_present(info, pdata->elm_of_node, BCH8_ECC);
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if (err < 0) {
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pr_err("nand: error: could not initialize ELM\n");
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err = elm_config(info->elm_dev, BCH8_ECC,
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info->mtd.writesize / nand_chip->ecc.size,
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nand_chip->ecc.size, nand_chip->ecc.bytes);
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if (err < 0)
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goto return_error;
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}
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/* define ECC layout */
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ecclayout->eccbytes = nand_chip->ecc.bytes *
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(mtd->writesize /
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@ -1973,14 +1995,8 @@ static int omap_nand_probe(struct platform_device *pdev)
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ecclayout->oobfree->offset =
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ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
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break;
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#else
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pr_err("nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
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err = -EINVAL;
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goto return_error;
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#endif
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case OMAP_ECC_BCH16_CODE_HW:
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#ifdef CONFIG_MTD_NAND_OMAP_BCH
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pr_info("using OMAP_ECC_BCH16_CODE_HW ECC scheme\n");
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nand_chip->ecc.mode = NAND_ECC_HW;
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nand_chip->ecc.size = 512;
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@ -1991,12 +2007,13 @@ static int omap_nand_probe(struct platform_device *pdev)
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nand_chip->ecc.calculate = omap_calculate_ecc_bch;
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nand_chip->ecc.read_page = omap_read_page_bch;
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nand_chip->ecc.write_page = omap_write_page_bch;
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/* This ECC scheme requires ELM H/W block */
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err = is_elm_present(info, pdata->elm_of_node, BCH16_ECC);
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if (err < 0) {
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pr_err("ELM is required for this ECC scheme\n");
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err = elm_config(info->elm_dev, BCH16_ECC,
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info->mtd.writesize / nand_chip->ecc.size,
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nand_chip->ecc.size, nand_chip->ecc.bytes);
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if (err < 0)
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goto return_error;
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}
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/* define ECC layout */
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ecclayout->eccbytes = nand_chip->ecc.bytes *
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(mtd->writesize /
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@ -2008,11 +2025,6 @@ static int omap_nand_probe(struct platform_device *pdev)
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ecclayout->oobfree->offset =
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ecclayout->eccpos[ecclayout->eccbytes - 1] + 1;
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break;
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#else
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pr_err("nand: error: CONFIG_MTD_NAND_OMAP_BCH not enabled\n");
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err = -EINVAL;
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goto return_error;
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#endif
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default:
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pr_err("nand: error: invalid or unsupported ECC scheme\n");
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err = -EINVAL;
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@ -42,8 +42,24 @@ struct elm_errorvec {
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int error_loc[16];
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};
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#if IS_ENABLED(CONFIG_MTD_NAND_OMAP_BCH)
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void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
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struct elm_errorvec *err_vec);
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int elm_config(struct device *dev, enum bch_ecc bch_type,
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int ecc_steps, int ecc_step_size, int ecc_syndrome_size);
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#else
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static inline void
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elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
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struct elm_errorvec *err_vec)
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{
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}
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static inline int elm_config(struct device *dev, enum bch_ecc bch_type,
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int ecc_steps, int ecc_step_size,
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int ecc_syndrome_size)
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{
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return -ENOSYS;
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}
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#endif /* CONFIG_MTD_NAND_ECC_BCH */
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#endif /* __ELM_H */
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