mtd: add bcmring nand driver
Signed-off-by: Leo Hao Chen <leochen@broadcom.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
diff --git a/drivers/mtd/nand/nand_bcm_umi.h b/drivers/mtd/nand/nand_bcm_umi.h
new file mode 100644
index 0000000..7cec2cd
--- /dev/null
+++ b/drivers/mtd/nand/nand_bcm_umi.h
@@ -0,0 +1,358 @@
+/*****************************************************************************
+* Copyright 2003 - 2009 Broadcom Corporation. All rights reserved.
+*
+* Unless you and Broadcom execute a separate written software license
+* agreement governing use of this software, this software is licensed to you
+* under the terms of the GNU General Public License version 2, available at
+* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
+*
+* Notwithstanding the above, under no circumstances may you combine this
+* software in any way with any other Broadcom software provided under a
+* license other than the GPL, without Broadcom's express prior written
+* consent.
+*****************************************************************************/
+#ifndef NAND_BCM_UMI_H
+#define NAND_BCM_UMI_H
+
+/* ---- Include Files ---------------------------------------------------- */
+#include <mach/reg_umi.h>
+#include <mach/reg_nand.h>
+#include <cfg_global.h>
+
+/* ---- Constants and Types ---------------------------------------------- */
+#if (CFG_GLOBAL_CHIP_FAMILY == CFG_GLOBAL_CHIP_FAMILY_BCMRING)
+#define NAND_ECC_BCH (CFG_GLOBAL_CHIP_REV > 0xA0)
+#else
+#define NAND_ECC_BCH 0
+#endif
+
+#define CFG_GLOBAL_NAND_ECC_BCH_NUM_BYTES 13
+
+#if NAND_ECC_BCH
+#ifdef BOOT0_BUILD
+#define NAND_ECC_NUM_BYTES 13
+#else
+#define NAND_ECC_NUM_BYTES CFG_GLOBAL_NAND_ECC_BCH_NUM_BYTES
+#endif
+#else
+#define NAND_ECC_NUM_BYTES 3
+#endif
+
+#define NAND_DATA_ACCESS_SIZE 512
+
+/* ---- Variable Externs ------------------------------------------ */
+/* ---- Function Prototypes --------------------------------------- */
+int nand_bcm_umi_bch_correct_page(uint8_t *datap, uint8_t *readEccData,
+ int numEccBytes);
+
+/* Check in device is ready */
+static inline int nand_bcm_umi_dev_ready(void)
+{
+ return REG_UMI_NAND_RCSR & REG_UMI_NAND_RCSR_RDY;
+}
+
+/* Wait until device is ready */
+static inline void nand_bcm_umi_wait_till_ready(void)
+{
+ while (nand_bcm_umi_dev_ready() == 0)
+ ;
+}
+
+/* Enable Hamming ECC */
+static inline void nand_bcm_umi_hamming_enable_hwecc(void)
+{
+ /* disable and reset ECC, 512 byte page */
+ REG_UMI_NAND_ECC_CSR &= ~(REG_UMI_NAND_ECC_CSR_ECC_ENABLE |
+ REG_UMI_NAND_ECC_CSR_256BYTE);
+ /* enable ECC */
+ REG_UMI_NAND_ECC_CSR |= REG_UMI_NAND_ECC_CSR_ECC_ENABLE;
+}
+
+#if NAND_ECC_BCH
+/* BCH ECC specifics */
+#define ECC_BITS_PER_CORRECTABLE_BIT 13
+
+/* Enable BCH Read ECC */
+static inline void nand_bcm_umi_bch_enable_read_hwecc(void)
+{
+ /* disable and reset ECC */
+ REG_UMI_BCH_CTRL_STATUS = REG_UMI_BCH_CTRL_STATUS_RD_ECC_VALID;
+ /* Turn on ECC */
+ REG_UMI_BCH_CTRL_STATUS = REG_UMI_BCH_CTRL_STATUS_ECC_RD_EN;
+}
+
+/* Enable BCH Write ECC */
+static inline void nand_bcm_umi_bch_enable_write_hwecc(void)
+{
+ /* disable and reset ECC */
+ REG_UMI_BCH_CTRL_STATUS = REG_UMI_BCH_CTRL_STATUS_WR_ECC_VALID;
+ /* Turn on ECC */
+ REG_UMI_BCH_CTRL_STATUS = REG_UMI_BCH_CTRL_STATUS_ECC_WR_EN;
+}
+
+/* Config number of BCH ECC bytes */
+static inline void nand_bcm_umi_bch_config_ecc(uint8_t numEccBytes)
+{
+ uint32_t nValue;
+ uint32_t tValue;
+ uint32_t kValue;
+ uint32_t numBits = numEccBytes * 8;
+
+ /* disable and reset ECC */
+ REG_UMI_BCH_CTRL_STATUS =
+ REG_UMI_BCH_CTRL_STATUS_WR_ECC_VALID |
+ REG_UMI_BCH_CTRL_STATUS_RD_ECC_VALID;
+
+ /* Every correctible bit requires 13 ECC bits */
+ tValue = (uint32_t) (numBits / ECC_BITS_PER_CORRECTABLE_BIT);
+
+ /* Total data in number of bits for generating and computing BCH ECC */
+ nValue = (NAND_DATA_ACCESS_SIZE + numEccBytes) * 8;
+
+ /* K parameter is used internally. K = N - (T * 13) */
+ kValue = nValue - (tValue * ECC_BITS_PER_CORRECTABLE_BIT);
+
+ /* Write the settings */
+ REG_UMI_BCH_N = nValue;
+ REG_UMI_BCH_T = tValue;
+ REG_UMI_BCH_K = kValue;
+}
+
+/* Pause during ECC read calculation to skip bytes in OOB */
+static inline void nand_bcm_umi_bch_pause_read_ecc_calc(void)
+{
+ REG_UMI_BCH_CTRL_STATUS =
+ REG_UMI_BCH_CTRL_STATUS_ECC_RD_EN |
+ REG_UMI_BCH_CTRL_STATUS_PAUSE_ECC_DEC;
+}
+
+/* Resume during ECC read calculation after skipping bytes in OOB */
+static inline void nand_bcm_umi_bch_resume_read_ecc_calc(void)
+{
+ REG_UMI_BCH_CTRL_STATUS = REG_UMI_BCH_CTRL_STATUS_ECC_RD_EN;
+}
+
+/* Poll read ECC calc to check when hardware completes */
+static inline uint32_t nand_bcm_umi_bch_poll_read_ecc_calc(void)
+{
+ uint32_t regVal;
+
+ do {
+ /* wait for ECC to be valid */
+ regVal = REG_UMI_BCH_CTRL_STATUS;
+ } while ((regVal & REG_UMI_BCH_CTRL_STATUS_RD_ECC_VALID) == 0);
+
+ return regVal;
+}
+
+/* Poll write ECC calc to check when hardware completes */
+static inline void nand_bcm_umi_bch_poll_write_ecc_calc(void)
+{
+ /* wait for ECC to be valid */
+ while ((REG_UMI_BCH_CTRL_STATUS & REG_UMI_BCH_CTRL_STATUS_WR_ECC_VALID)
+ == 0)
+ ;
+}
+
+/* Read the OOB and ECC, for kernel write OOB to a buffer */
+#if defined(__KERNEL__) && !defined(STANDALONE)
+static inline void nand_bcm_umi_bch_read_oobEcc(uint32_t pageSize,
+ uint8_t *eccCalc, int numEccBytes, uint8_t *oobp)
+#else
+static inline void nand_bcm_umi_bch_read_oobEcc(uint32_t pageSize,
+ uint8_t *eccCalc, int numEccBytes)
+#endif
+{
+ int eccPos = 0;
+ int numToRead = 16; /* There are 16 bytes per sector in the OOB */
+
+ /* ECC is already paused when this function is called */
+
+ if (pageSize == NAND_DATA_ACCESS_SIZE) {
+ while (numToRead > numEccBytes) {
+ /* skip free oob region */
+#if defined(__KERNEL__) && !defined(STANDALONE)
+ *oobp++ = REG_NAND_DATA8;
+#else
+ REG_NAND_DATA8;
+#endif
+ numToRead--;
+ }
+
+ /* read ECC bytes before BI */
+ nand_bcm_umi_bch_resume_read_ecc_calc();
+
+ while (numToRead > 11) {
+#if defined(__KERNEL__) && !defined(STANDALONE)
+ *oobp = REG_NAND_DATA8;
+ eccCalc[eccPos++] = *oobp;
+ oobp++;
+#else
+ eccCalc[eccPos++] = REG_NAND_DATA8;
+#endif
+ }
+
+ nand_bcm_umi_bch_pause_read_ecc_calc();
+
+ if (numToRead == 11) {
+ /* read BI */
+#if defined(__KERNEL__) && !defined(STANDALONE)
+ *oobp++ = REG_NAND_DATA8;
+#else
+ REG_NAND_DATA8;
+#endif
+ numToRead--;
+ }
+
+ /* read ECC bytes */
+ nand_bcm_umi_bch_resume_read_ecc_calc();
+ while (numToRead) {
+#if defined(__KERNEL__) && !defined(STANDALONE)
+ *oobp = REG_NAND_DATA8;
+ eccCalc[eccPos++] = *oobp;
+ oobp++;
+#else
+ eccCalc[eccPos++] = REG_NAND_DATA8;
+#endif
+ numToRead--;
+ }
+ } else {
+ /* skip BI */
+#if defined(__KERNEL__) && !defined(STANDALONE)
+ *oobp++ = REG_NAND_DATA8;
+#else
+ REG_NAND_DATA8;
+#endif
+ numToRead--;
+
+ while (numToRead > numEccBytes) {
+ /* skip free oob region */
+#if defined(__KERNEL__) && !defined(STANDALONE)
+ *oobp++ = REG_NAND_DATA8;
+#else
+ REG_NAND_DATA8;
+#endif
+ numToRead--;
+ }
+
+ /* read ECC bytes */
+ nand_bcm_umi_bch_resume_read_ecc_calc();
+ while (numToRead) {
+#if defined(__KERNEL__) && !defined(STANDALONE)
+ *oobp = REG_NAND_DATA8;
+ eccCalc[eccPos++] = *oobp;
+ oobp++;
+#else
+ eccCalc[eccPos++] = REG_NAND_DATA8;
+#endif
+ numToRead--;
+ }
+ }
+}
+
+/* Helper function to write ECC */
+static inline void NAND_BCM_UMI_ECC_WRITE(int numEccBytes, int eccBytePos,
+ uint8_t *oobp, uint8_t eccVal)
+{
+ if (eccBytePos <= numEccBytes)
+ *oobp = eccVal;
+}
+
+/* Write OOB with ECC */
+static inline void nand_bcm_umi_bch_write_oobEcc(uint32_t pageSize,
+ uint8_t *oobp, int numEccBytes)
+{
+ uint32_t eccVal = 0xffffffff;
+
+ /* wait for write ECC to be valid */
+ nand_bcm_umi_bch_poll_write_ecc_calc();
+
+ /*
+ ** Get the hardware ecc from the 32-bit result registers.
+ ** Read after 512 byte accesses. Format B3B2B1B0
+ ** where B3 = ecc3, etc.
+ */
+
+ if (pageSize == NAND_DATA_ACCESS_SIZE) {
+ /* Now fill in the ECC bytes */
+ if (numEccBytes >= 13)
+ eccVal = REG_UMI_BCH_WR_ECC_3;
+
+ /* Usually we skip CM in oob[0,1] */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 15, &oobp[0],
+ (eccVal >> 16) & 0xff);
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 14, &oobp[1],
+ (eccVal >> 8) & 0xff);
+
+ /* Write ECC in oob[2,3,4] */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 13, &oobp[2],
+ eccVal & 0xff); /* ECC 12 */
+
+ if (numEccBytes >= 9)
+ eccVal = REG_UMI_BCH_WR_ECC_2;
+
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 12, &oobp[3],
+ (eccVal >> 24) & 0xff); /* ECC11 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 11, &oobp[4],
+ (eccVal >> 16) & 0xff); /* ECC10 */
+
+ /* Always Skip BI in oob[5] */
+ } else {
+ /* Always Skip BI in oob[0] */
+
+ /* Now fill in the ECC bytes */
+ if (numEccBytes >= 13)
+ eccVal = REG_UMI_BCH_WR_ECC_3;
+
+ /* Usually skip CM in oob[1,2] */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 15, &oobp[1],
+ (eccVal >> 16) & 0xff);
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 14, &oobp[2],
+ (eccVal >> 8) & 0xff);
+
+ /* Write ECC in oob[3-15] */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 13, &oobp[3],
+ eccVal & 0xff); /* ECC12 */
+
+ if (numEccBytes >= 9)
+ eccVal = REG_UMI_BCH_WR_ECC_2;
+
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 12, &oobp[4],
+ (eccVal >> 24) & 0xff); /* ECC11 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 11, &oobp[5],
+ (eccVal >> 16) & 0xff); /* ECC10 */
+ }
+
+ /* Fill in the remainder of ECC locations */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 10, &oobp[6],
+ (eccVal >> 8) & 0xff); /* ECC9 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 9, &oobp[7],
+ eccVal & 0xff); /* ECC8 */
+
+ if (numEccBytes >= 5)
+ eccVal = REG_UMI_BCH_WR_ECC_1;
+
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 8, &oobp[8],
+ (eccVal >> 24) & 0xff); /* ECC7 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 7, &oobp[9],
+ (eccVal >> 16) & 0xff); /* ECC6 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 6, &oobp[10],
+ (eccVal >> 8) & 0xff); /* ECC5 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 5, &oobp[11],
+ eccVal & 0xff); /* ECC4 */
+
+ if (numEccBytes >= 1)
+ eccVal = REG_UMI_BCH_WR_ECC_0;
+
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 4, &oobp[12],
+ (eccVal >> 24) & 0xff); /* ECC3 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 3, &oobp[13],
+ (eccVal >> 16) & 0xff); /* ECC2 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 2, &oobp[14],
+ (eccVal >> 8) & 0xff); /* ECC1 */
+ NAND_BCM_UMI_ECC_WRITE(numEccBytes, 1, &oobp[15],
+ eccVal & 0xff); /* ECC0 */
+}
+#endif
+
+#endif /* NAND_BCM_UMI_H */