Add SPI-NOR framework

SPI-NOR framework is based on SPI-MEM framework using
spi_mem_op execution interface.

It implements read functions and allows NOR configuration
up to quad mode.
Default management is 1 data line but it can be overridden
by platform.
It also includes specific quad mode configuration for
Spansion, Micron and Macronix memories.

Change-Id: If49502b899b4a75f6ebc3190f6bde1013651197f
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Christophe Kerello <christophe.kerello@st.com>

1 files changed, 387 insertions, 0 deletions

diff --git a/drivers/mtd/nor/spi_nor.c b/drivers/mtd/nor/spi_nor.c
new file mode 100644
index 000000000..22d3ae3d9
--- /dev/null
+++ b/drivers/mtd/nor/spi_nor.c
@@ -0,0 +1,387 @@
+/*
+ * Copyright (c) 2019, STMicroelectronics - All Rights Reserved
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <assert.h>
+#include <errno.h>
+#include <stddef.h>
+
+#include <common/debug.h>
+#include <drivers/delay_timer.h>
+#include <drivers/spi_nor.h>
+#include <lib/utils.h>
+
+#define SR_WIP			BIT(0)	/* Write in progress */
+#define CR_QUAD_EN_SPAN		BIT(1)	/* Spansion Quad I/O */
+#define SR_QUAD_EN_MX		BIT(6)	/* Macronix Quad I/O */
+#define FSR_READY		BIT(7)	/* Device status, 0 = Busy, 1 = Ready */
+
+/* Defined IDs for supported memories */
+#define SPANSION_ID		0x01U
+#define MACRONIX_ID		0xC2U
+#define MICRON_ID		0x2CU
+
+#define BANK_SIZE		0x1000000U
+
+#define SPI_READY_TIMEOUT_US	40000U
+
+static struct nor_device nor_dev;
+
+#pragma weak plat_get_nor_data
+int plat_get_nor_data(struct nor_device *device)
+{
+	return 0;
+}
+
+static int spi_nor_reg(uint8_t reg, uint8_t *buf, size_t len,
+		       enum spi_mem_data_dir dir)
+{
+	struct spi_mem_op op;
+
+	zeromem(&op, sizeof(struct spi_mem_op));
+	op.cmd.opcode = reg;
+	op.cmd.buswidth = SPI_MEM_BUSWIDTH_1_LINE;
+	op.data.buswidth = SPI_MEM_BUSWIDTH_1_LINE;
+	op.data.dir = dir;
+	op.data.nbytes = len;
+	op.data.buf = buf;
+
+	return spi_mem_exec_op(&op);
+}
+
+static inline int spi_nor_read_id(uint8_t *id)
+{
+	return spi_nor_reg(SPI_NOR_OP_READ_ID, id, 1U, SPI_MEM_DATA_IN);
+}
+
+static inline int spi_nor_read_cr(uint8_t *cr)
+{
+	return spi_nor_reg(SPI_NOR_OP_READ_CR, cr, 1U, SPI_MEM_DATA_IN);
+}
+
+static inline int spi_nor_read_sr(uint8_t *sr)
+{
+	return spi_nor_reg(SPI_NOR_OP_READ_SR, sr, 1U, SPI_MEM_DATA_IN);
+}
+
+static inline int spi_nor_read_fsr(uint8_t *fsr)
+{
+	return spi_nor_reg(SPI_NOR_OP_READ_FSR, fsr, 1U, SPI_MEM_DATA_IN);
+}
+
+static inline int spi_nor_write_en(void)
+{
+	return spi_nor_reg(SPI_NOR_OP_WREN, NULL, 0U, SPI_MEM_DATA_OUT);
+}
+
+/*
+ * Check if device is ready.
+ *
+ * Return 0 if ready, 1 if busy or a negative error code otherwise
+ */
+static int spi_nor_ready(void)
+{
+	uint8_t sr;
+	int ret;
+
+	ret = spi_nor_read_sr(&sr);
+	if (ret != 0) {
+		return ret;
+	}
+
+	if ((nor_dev.flags & SPI_NOR_USE_FSR) != 0U) {
+		uint8_t fsr;
+
+		ret = spi_nor_read_fsr(&fsr);
+		if (ret != 0) {
+			return ret;
+		}
+
+		return (((fsr & FSR_READY) != 0U) && ((sr & SR_WIP) == 0U)) ?
+			0 : 1;
+	}
+
+	return (((sr & SR_WIP) != 0U) ? 1 : 0);
+}
+
+static int spi_nor_wait_ready(void)
+{
+	int ret;
+	uint64_t timeout = timeout_init_us(SPI_READY_TIMEOUT_US);
+
+	while (!timeout_elapsed(timeout)) {
+		ret = spi_nor_ready();
+		if (ret <= 0) {
+			return ret;
+		}
+	}
+
+	return -ETIMEDOUT;
+}
+
+static int spi_nor_macronix_quad_enable(void)
+{
+	uint8_t sr;
+	int ret;
+
+	ret = spi_nor_read_sr(&sr);
+	if (ret != 0) {
+		return ret;
+	}
+
+	if ((sr & SR_QUAD_EN_MX) == 0U) {
+		return 0;
+	}
+
+	ret = spi_nor_write_en();
+	if (ret != 0) {
+		return ret;
+	}
+
+	sr |= SR_QUAD_EN_MX;
+	ret = spi_nor_reg(SPI_NOR_OP_WRSR, &sr, 1, SPI_MEM_DATA_OUT);
+	if (ret != 0) {
+		return ret;
+	}
+
+	ret = spi_nor_wait_ready();
+	if (ret != 0) {
+		return ret;
+	}
+
+	ret = spi_nor_read_sr(&sr);
+	if ((ret != 0) || ((sr & SR_QUAD_EN_MX) == 0U)) {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int spi_nor_write_sr_cr(uint8_t *sr_cr)
+{
+	int ret;
+
+	ret = spi_nor_write_en();
+	if (ret != 0) {
+		return ret;
+	}
+
+	ret = spi_nor_reg(SPI_NOR_OP_WRSR, sr_cr, 2, SPI_MEM_DATA_OUT);
+	if (ret != 0) {
+		return -EINVAL;
+	}
+
+	ret = spi_nor_wait_ready();
+	if (ret != 0) {
+		return ret;
+	}
+
+	return 0;
+}
+
+static int spi_nor_quad_enable(void)
+{
+	uint8_t sr_cr[2];
+	int ret;
+
+	ret = spi_nor_read_cr(&sr_cr[1]);
+	if (ret != 0) {
+		return ret;
+	}
+
+	if ((sr_cr[1] & CR_QUAD_EN_SPAN) != 0U) {
+		return 0;
+	}
+
+	sr_cr[1] |= CR_QUAD_EN_SPAN;
+	ret = spi_nor_read_sr(&sr_cr[0]);
+	if (ret != 0) {
+		return ret;
+	}
+
+	ret = spi_nor_write_sr_cr(sr_cr);
+	if (ret != 0) {
+		return ret;
+	}
+
+	ret = spi_nor_read_cr(&sr_cr[1]);
+	if ((ret != 0) || ((sr_cr[1] & CR_QUAD_EN_SPAN) == 0U)) {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int spi_nor_clean_bar(void)
+{
+	int ret;
+
+	if (nor_dev.selected_bank == 0U) {
+		return 0;
+	}
+
+	nor_dev.selected_bank = 0U;
+
+	ret = spi_nor_write_en();
+	if (ret != 0) {
+		return ret;
+	}
+
+	return spi_nor_reg(nor_dev.bank_write_cmd, &nor_dev.selected_bank,
+			   1, SPI_MEM_DATA_OUT);
+}
+
+static int spi_nor_write_bar(uint32_t offset)
+{
+	uint8_t selected_bank = offset / BANK_SIZE;
+	int ret;
+
+	if (selected_bank == nor_dev.selected_bank) {
+		return 0;
+	}
+
+	ret = spi_nor_write_en();
+	if (ret != 0) {
+		return ret;
+	}
+
+	ret = spi_nor_reg(nor_dev.bank_write_cmd, &selected_bank,
+			  1, SPI_MEM_DATA_OUT);
+	if (ret != 0) {
+		return ret;
+	}
+
+	nor_dev.selected_bank = selected_bank;
+
+	return 0;
+}
+
+static int spi_nor_read_bar(void)
+{
+	uint8_t selected_bank = 0;
+	int ret;
+
+	ret = spi_nor_reg(nor_dev.bank_read_cmd, &selected_bank,
+			  1, SPI_MEM_DATA_IN);
+	if (ret != 0) {
+		return ret;
+	}
+
+	nor_dev.selected_bank = selected_bank;
+
+	return 0;
+}
+
+int spi_nor_read(unsigned int offset, uintptr_t buffer, size_t length,
+		 size_t *length_read)
+{
+	size_t remain_len;
+	int ret;
+
+	*length_read = 0;
+	nor_dev.read_op.addr.val = offset;
+	nor_dev.read_op.data.buf = (void *)buffer;
+
+	VERBOSE("%s offset %i length %zu\n", __func__, offset, length);
+
+	while (length != 0U) {
+		if ((nor_dev.flags & SPI_NOR_USE_BANK) != 0U) {
+			ret = spi_nor_write_bar(nor_dev.read_op.addr.val);
+			if (ret != 0) {
+				return ret;
+			}
+
+			remain_len = (BANK_SIZE * (nor_dev.selected_bank + 1)) -
+				nor_dev.read_op.addr.val;
+			nor_dev.read_op.data.nbytes = MIN(length, remain_len);
+		} else {
+			nor_dev.read_op.data.nbytes = length;
+		}
+
+		ret = spi_mem_exec_op(&nor_dev.read_op);
+		if (ret != 0) {
+			spi_nor_clean_bar();
+			return ret;
+		}
+
+		length -= nor_dev.read_op.data.nbytes;
+		nor_dev.read_op.addr.val += nor_dev.read_op.data.nbytes;
+		nor_dev.read_op.data.buf += nor_dev.read_op.data.nbytes;
+		*length_read += nor_dev.read_op.data.nbytes;
+	}
+
+	if ((nor_dev.flags & SPI_NOR_USE_BANK) != 0U) {
+		ret = spi_nor_clean_bar();
+		if (ret != 0) {
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+int spi_nor_init(unsigned long long *size, unsigned int *erase_size)
+{
+	int ret = 0;
+	uint8_t id;
+
+	/* Default read command used */
+	nor_dev.read_op.cmd.opcode = SPI_NOR_OP_READ;
+	nor_dev.read_op.cmd.buswidth = SPI_MEM_BUSWIDTH_1_LINE;
+	nor_dev.read_op.addr.nbytes = 3U;
+	nor_dev.read_op.addr.buswidth = SPI_MEM_BUSWIDTH_1_LINE;
+	nor_dev.read_op.data.buswidth = SPI_MEM_BUSWIDTH_1_LINE;
+	nor_dev.read_op.data.dir = SPI_MEM_DATA_IN;
+
+	if (plat_get_nor_data(&nor_dev) != 0) {
+		return -EINVAL;
+	}
+
+	assert(nor_dev.size != 0);
+
+	if (nor_dev.size > BANK_SIZE) {
+		nor_dev.flags |= SPI_NOR_USE_BANK;
+	}
+
+	*size = nor_dev.size;
+
+	ret = spi_nor_read_id(&id);
+	if (ret != 0) {
+		return ret;
+	}
+
+	if ((nor_dev.flags & SPI_NOR_USE_BANK) != 0U) {
+		switch (id) {
+		case SPANSION_ID:
+			nor_dev.bank_read_cmd = SPINOR_OP_BRRD;
+			nor_dev.bank_write_cmd = SPINOR_OP_BRWR;
+			break;
+		default:
+			nor_dev.bank_read_cmd = SPINOR_OP_RDEAR;
+			nor_dev.bank_write_cmd = SPINOR_OP_WREAR;
+			break;
+		}
+	}
+
+	if (nor_dev.read_op.data.buswidth == 4U) {
+		switch (id) {
+		case MACRONIX_ID:
+			WARN("Enable Macronix quad support\n");
+			ret = spi_nor_macronix_quad_enable();
+			break;
+		case MICRON_ID:
+			break;
+		default:
+			ret = spi_nor_quad_enable();
+			break;
+		}
+	}
+
+	if ((ret == 0) && ((nor_dev.flags & SPI_NOR_USE_BANK) != 0U)) {
+		ret = spi_nor_read_bar();
+	}
+
+	return ret;
+}