[PATCH] mtd: rawnand: brcmnand: legacy exec_op implementation

["Álvaro Fernández Rojas" <noltari@gmail.com>]

Commit 3c8260ce7663 ("mtd: rawnand: brcmnand: exec_op implementation")
removed legacy interface functions, breaking < v5.0 controllers support.
In order to fix older controllers we need to add an alternative exec_op
implementation which doesn't rely on low level registers.

Fixes: 3c8260ce7663 ("mtd: rawnand: brcmnand: exec_op implementation")
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
---
 drivers/mtd/nand/raw/brcmnand/brcmnand.c | 174 ++++++++++++++++++++++-
 1 file changed, 168 insertions(+), 6 deletions(-)

diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
index 17f6d9723df9..919e322189d5 100644
--- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
+++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
@@ -2490,14 +2490,177 @@ static int brcmnand_op_is_reset(const struct nand_operation *op)
 	return 0;
 }
 
+static int brcmnand_exec_instructions(struct nand_chip *chip,
+				      const struct nand_operation *op)
+{
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	unsigned int i;
+	int ret = 0;
+
+	for (i = 0; i < op->ninstrs; i++) {
+		ret = brcmnand_exec_instr(host, i, op);
+		if (ret)
+			break;
+	}
+
+	return ret;
+}
+
+static int brcmnand_exec_instructions_legacy(struct nand_chip *chip,
+					     const struct nand_operation *op)
+{
+	struct mtd_info *mtd = nand_to_mtd(chip);
+	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_controller *ctrl = host->ctrl;
+	const struct nand_op_instr *instr;
+	unsigned int i, j;
+	int cmd = CMD_NULL, last_cmd = CMD_NULL;
+	int ret = 0;
+
+	for (i = 0; i < op->ninstrs; i++) {
+		instr = &op->instrs[i];
+
+		if (instr->type == NAND_OP_CMD_INSTR) {
+			if (instr->ctx.cmd.opcode == NAND_CMD_READID) {
+				cmd = CMD_DEVICE_ID_READ;
+			} else if (instr->ctx.cmd.opcode == NAND_CMD_READOOB) {
+				cmd = CMD_SPARE_AREA_READ;
+			} else if (instr->ctx.cmd.opcode == NAND_CMD_ERASE1) {
+				cmd = CMD_BLOCK_ERASE;
+				brcmnand_wp(mtd, 0);
+			} else if (instr->ctx.cmd.opcode == NAND_CMD_ERASE2) {
+				cmd = CMD_NULL;
+			} else if (instr->ctx.cmd.opcode == NAND_CMD_PARAM) {
+				cmd = CMD_PARAMETER_READ;
+			} else if (instr->ctx.cmd.opcode == NAND_CMD_RNDOUT) {
+				cmd = CMD_PARAMETER_CHANGE_COL;
+			} else if (instr->ctx.cmd.opcode == NAND_CMD_RNDOUTSTART) {
+				cmd = CMD_NULL;
+			} else {
+				dev_err(ctrl->dev, "unsupported cmd=%d\n",
+					instr->ctx.cmd.opcode);
+				ret = -EOPNOTSUPP;
+				break;
+			}
+		} else if (instr->type == NAND_OP_ADDR_INSTR) {
+			u64 addr = 0;
+
+			if (cmd == CMD_NULL)
+				continue;
+
+			if (instr->ctx.addr.naddrs > 8) {
+				dev_err(ctrl->dev, "unsupported naddrs=%u\n",
+					instr->ctx.addr.naddrs);
+				ret = -EOPNOTSUPP;
+				break;
+			}
+
+			for (j = 0; j < instr->ctx.addr.naddrs; j++)
+				addr |= (instr->ctx.addr.addrs[j]) << (j << 3);
+
+			if (cmd == CMD_PARAMETER_CHANGE_COL) {
+				addr &= ~((u64)(FC_BYTES - 1));
+
+				if (brcmnand_get_sector_size_1k(host)) {
+					host->hwcfg.sector_size_1k =
+						brcmnand_get_sector_size_1k(host);
+					brcmnand_set_sector_size_1k(host, 0);
+				}
+			}
+
+			host->last_addr = addr;
+
+			brcmnand_set_cmd_addr(mtd, addr);
+			brcmnand_send_cmd(host, cmd);
+			last_cmd = cmd;
+			cmd = CMD_NULL;
+			brcmnand_waitfunc(chip);
+
+			if (last_cmd == CMD_PARAMETER_READ ||
+			    last_cmd == CMD_PARAMETER_CHANGE_COL) {
+				/* Copy flash cache word-wise */
+				u32 *flash_cache = (u32 *)ctrl->flash_cache;
+
+				brcmnand_soc_data_bus_prepare(ctrl->soc, true);
+
+				/*
+				 * Must cache the FLASH_CACHE now, since changes in
+				 * SECTOR_SIZE_1K may invalidate it
+				 */
+				for (i = 0; i < FC_WORDS; i++)
+					/*
+					 * Flash cache is big endian for parameter pages, at
+					 * least on STB SoCs
+					 */
+					flash_cache[i] = be32_to_cpu(brcmnand_read_fc(ctrl, i));
+
+				brcmnand_soc_data_bus_unprepare(ctrl->soc, true);
+
+				/* Cleanup from HW quirk: restore SECTOR_SIZE_1K */
+				if (host->hwcfg.sector_size_1k)
+					brcmnand_set_sector_size_1k(host,
+								    host->hwcfg.sector_size_1k);
+			} else if (last_cmd == NAND_CMD_ERASE1) {
+				brcmnand_wp(mtd, 1);
+			}
+		} else if (instr->type == NAND_OP_DATA_IN_INSTR) {
+			u8 *in = instr->ctx.data.buf.in;
+
+			if (last_cmd == CMD_DEVICE_ID_READ) {
+				u32 val;
+
+				if (instr->ctx.data.len > 8) {
+					dev_err(ctrl->dev, "unsupported len=%u\n",
+						instr->ctx.data.len);
+					ret = -EOPNOTSUPP;
+					break;
+				}
+
+				for (j = 0; j < instr->ctx.data.len; j++) {
+					if (j == 0)
+						val = brcmnand_read_reg(ctrl, BRCMNAND_ID);
+					else if (j == 4)
+						val = brcmnand_read_reg(ctrl, BRCMNAND_ID_EXT);
+
+					in[j] = (val >> (24 - ((j % 4) << 3))) & 0xff;
+				}
+			} else if (last_cmd == CMD_SPARE_AREA_READ) {
+				for (j = 0; j < instr->ctx.data.len; j++)
+					in[j] = oob_reg_read(ctrl, j);
+			} else if (last_cmd == NAND_CMD_PARAM || last_cmd == NAND_CMD_RNDOUT) {
+				u64 addr;
+				u32 offs;
+
+				for (j = 0; j < instr->ctx.data.len; j++) {
+					addr = host->last_addr = j;
+					offs = addr & (FC_BYTES - 1);
+
+					if (j > 0 && offs == 0)
+						nand_change_read_column_op(chip, addr, NULL, 0,
+									   false);
+
+					in[j] = ctrl->flash_cache[offs];
+				}
+			}
+		} else if (instr->type == NAND_OP_WAITRDY_INSTR) {
+			ret = bcmnand_ctrl_poll_status(host, NAND_CTRL_RDY, NAND_CTRL_RDY, 0);
+		} else {
+			dev_err(ctrl->dev, "unsupported instruction type: %d\n", instr->type);
+			ret = -EINVAL;
+		}
+	}
+
+	return ret;
+}
+
 static int brcmnand_exec_op(struct nand_chip *chip,
 			    const struct nand_operation *op,
 			    bool check_only)
 {
 	struct brcmnand_host *host = nand_get_controller_data(chip);
+	struct brcmnand_controller *ctrl = host->ctrl;
 	struct mtd_info *mtd = nand_to_mtd(chip);
 	u8 *status;
-	unsigned int i;
 	int ret = 0;
 
 	if (check_only)
@@ -2525,11 +2688,10 @@ static int brcmnand_exec_op(struct nand_chip *chip,
 	if (op->deassert_wp)
 		brcmnand_wp(mtd, 0);
 
-	for (i = 0; i < op->ninstrs; i++) {
-		ret = brcmnand_exec_instr(host, i, op);
-		if (ret)
-			break;
-	}
+	if (ctrl->nand_version >= 0x500)
+		brcmnand_exec_instructions(chip, op);
+	else
+		brcmnand_exec_instructions_legacy(chip, op);
 
 	if (op->deassert_wp)
 		brcmnand_wp(mtd, 1);
-- 
2.39.5


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