sc7180: Add SPI-NOR support

This implements the SPI-NOR driver for the Qualcomm QSPI core.

Developer/Reviewer, be aware of this patch from Napali:
https://review.coreboot.org/c/coreboot/+/27483/58

Change-Id: I2eb8cf90aa4559541ba293b3fd2870896bed20b7
Signed-off-by: Akash Asthana <akashast@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35501
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

1 files changed, 306 insertions, 0 deletions

diff --git a/src/soc/qualcomm/sc7180/qspi.c b/src/soc/qualcomm/sc7180/qspi.c
new file mode 100644
index 0000000000..30dc1c3387
--- /dev/null
+++ b/src/soc/qualcomm/sc7180/qspi.c
@@ -0,0 +1,306 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2019, The Linux Foundation.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <spi-generic.h>
+#include <spi_flash.h>
+#include <arch/cache.h>
+#include <device/mmio.h>
+#include <soc/addressmap.h>
+#include <soc/qspi.h>
+#include <soc/gpio.h>
+#include <soc/clock.h>
+#include <symbols.h>
+#include <assert.h>
+#include <gpio.h>
+#include <string.h>
+
+#define CACHE_LINE_SIZE	64
+
+static int curr_desc_idx = -1;
+
+struct cmd_desc {
+	uint32_t data_address;
+	uint32_t next_descriptor;
+	uint32_t direction:1;
+	uint32_t multi_io_mode:3;
+	uint32_t reserved1:4;
+	uint32_t fragment:1;
+	uint32_t reserved2:7;
+	uint32_t length:16;
+	//------------------------//
+	uint32_t bounce_src;
+	uint32_t bounce_dst;
+	uint32_t bounce_length;
+	uint64_t padding[5];
+};
+
+enum qspi_mode {
+	SDR_1BIT = 1,
+	SDR_2BIT = 2,
+	SDR_4BIT = 3,
+	DDR_1BIT = 5,
+	DDR_2BIT = 6,
+	DDR_4BIT = 7,
+};
+
+enum cs_state {
+	CS_DEASSERT,
+	CS_ASSERT
+};
+
+struct xfer_cfg {
+	enum qspi_mode mode;
+};
+
+enum bus_xfer_direction {
+	MASTER_READ = 0,
+	MASTER_WRITE = 1,
+};
+
+struct {
+	struct cmd_desc descriptors[3];
+	uint8_t buffers[3][CACHE_LINE_SIZE];
+} *dma = (void *)_dma_coherent;
+
+static void dma_transfer_chain(struct cmd_desc *chain)
+{
+	uint32_t mstr_int_status;
+
+	write32(&sc7180_qspi->mstr_int_sts, 0xFFFFFFFF);
+	write32(&sc7180_qspi->next_dma_desc_addr, (uint32_t)(uintptr_t) chain);
+
+	while (1) {
+		mstr_int_status = read32(&sc7180_qspi->mstr_int_sts);
+		if (mstr_int_status & DMA_CHAIN_DONE)
+			break;
+	}
+}
+
+static void flush_chain(void)
+{
+	struct cmd_desc *desc = &dma->descriptors[0];
+	uint8_t *src;
+	uint8_t *dst;
+
+	dma_transfer_chain(desc);
+
+	while (desc) {
+		if (desc->direction == MASTER_READ) {
+			if (desc->bounce_length == 0)
+				dcache_invalidate_by_mva(
+					(void *)(uintptr_t) desc->data_address,
+					desc->length);
+			else {
+				src = (void *)(uintptr_t) desc->bounce_src;
+				dst = (void *)(uintptr_t) desc->bounce_dst;
+				memcpy(dst, src, desc->bounce_length);
+			}
+		}
+		desc = (void *)(uintptr_t) desc->next_descriptor;
+	}
+	curr_desc_idx = -1;
+}
+
+static struct cmd_desc *allocate_descriptor(void)
+{
+	struct cmd_desc *current;
+	struct cmd_desc *next;
+	uint8_t index;
+
+	current = (curr_desc_idx == -1) ?
+		NULL : &dma->descriptors[curr_desc_idx];
+
+	index = ++curr_desc_idx;
+	next = &dma->descriptors[index];
+
+	next->data_address = (uint32_t) (uintptr_t) dma->buffers[index];
+
+	next->next_descriptor = 0;
+	next->direction = MASTER_READ;
+	next->multi_io_mode = 0;
+	next->reserved1 = 0;
+	next->fragment = 0;
+	next->reserved2 = 0;
+	next->length = 0;
+	next->bounce_src = 0;
+	next->bounce_dst = 0;
+	next->bounce_length = 0;
+
+	if (current) {
+		current->next_descriptor = (uint32_t)(uintptr_t) next;
+		current->fragment = 1;
+	}
+
+	return next;
+}
+
+static void cs_change(enum cs_state state)
+{
+	gpio_set(GPIO(68), state == CS_DEASSERT);
+}
+
+static void configure_gpios(void)
+{
+	gpio_output(GPIO(68), 1);
+
+	gpio_configure(GPIO(64), GPIO64_FUNC_QSPI_DATA_0,
+		GPIO_NO_PULL, GPIO_2MA, GPIO_OUTPUT_ENABLE);
+
+	gpio_configure(GPIO(65), GPIO65_FUNC_QSPI_DATA_1,
+		GPIO_NO_PULL, GPIO_2MA, GPIO_OUTPUT_ENABLE);
+
+	gpio_configure(GPIO(63), GPIO63_FUNC_QSPI_CLK,
+		GPIO_NO_PULL, GPIO_2MA, GPIO_OUTPUT_ENABLE);
+}
+
+static void queue_bounce_data(uint8_t *data, uint32_t data_bytes,
+			      enum qspi_mode data_mode, bool write)
+{
+	struct cmd_desc *desc;
+	uint8_t *ptr;
+
+	desc = allocate_descriptor();
+	desc->direction = write;
+	desc->multi_io_mode = data_mode;
+	ptr = (void *)(uintptr_t) desc->data_address;
+
+	if (write) {
+		memcpy(ptr, data, data_bytes);
+	} else {
+		desc->bounce_src = (uint32_t)(uintptr_t) ptr;
+		desc->bounce_dst = (uint32_t)(uintptr_t) data;
+		desc->bounce_length = data_bytes;
+	}
+
+	desc->length = data_bytes;
+}
+
+static void queue_direct_data(uint8_t *data, uint32_t data_bytes,
+			      enum qspi_mode data_mode, bool write)
+{
+	struct cmd_desc *desc;
+
+	desc = allocate_descriptor();
+	desc->direction = write;
+	desc->multi_io_mode = data_mode;
+	desc->data_address = (uint32_t)(uintptr_t) data;
+	desc->length = data_bytes;
+
+	if (write)
+		dcache_clean_by_mva(data, data_bytes);
+	else
+		dcache_invalidate_by_mva(data, data_bytes);
+}
+
+static void queue_data(uint8_t *data, uint32_t data_bytes,
+	enum qspi_mode data_mode, bool write)
+{
+	uint8_t *aligned_ptr;
+	uint8_t *epilog_ptr;
+	uint32_t prolog_bytes, aligned_bytes, epilog_bytes;
+
+	if (data_bytes == 0)
+		return;
+
+	aligned_ptr =
+		(uint8_t *)ALIGN_UP((uintptr_t)data, CACHE_LINE_SIZE);
+
+	prolog_bytes = MIN(data_bytes, aligned_ptr - data);
+	aligned_bytes = ALIGN_DOWN(data_bytes - prolog_bytes, CACHE_LINE_SIZE);
+	epilog_bytes = data_bytes - prolog_bytes - aligned_bytes;
+
+	epilog_ptr = data + prolog_bytes + aligned_bytes;
+
+	if (prolog_bytes)
+		queue_bounce_data(data, prolog_bytes, data_mode, write);
+	if (aligned_bytes)
+		queue_direct_data(aligned_ptr, aligned_bytes, data_mode, write);
+	if (epilog_bytes)
+		queue_bounce_data(epilog_ptr, epilog_bytes, data_mode, write);
+}
+
+static void reg_init(void)
+{
+	uint32_t spi_mode;
+	uint32_t tx_data_oe_delay, tx_data_delay;
+	uint32_t mstr_config;
+
+	spi_mode = 0;
+
+	tx_data_oe_delay = 0;
+	tx_data_delay = 0;
+
+	mstr_config = (tx_data_oe_delay << TX_DATA_OE_DELAY_SHIFT) |
+		(tx_data_delay << TX_DATA_DELAY_SHIFT) | (SBL_EN) |
+		(spi_mode << SPI_MODE_SHIFT) |
+		(PIN_HOLDN) |
+		(FB_CLK_EN) |
+		(DMA_ENABLE) |
+		(FULL_CYCLE_MODE);
+
+	write32(&sc7180_qspi->mstr_cfg, mstr_config);
+	write32(&sc7180_qspi->ahb_mstr_cfg, 0xA42);
+	write32(&sc7180_qspi->mstr_int_en, 0x0);
+	write32(&sc7180_qspi->mstr_int_sts, 0xFFFFFFFF);
+	write32(&sc7180_qspi->rd_fifo_cfg, 0x0);
+	write32(&sc7180_qspi->rd_fifo_rst, RESET_FIFO);
+}
+
+void quadspi_init(uint32_t hz)
+{
+	assert(dcache_line_bytes() == CACHE_LINE_SIZE);
+	clock_configure_qspi(hz * 4);
+	configure_gpios();
+	reg_init();
+}
+
+int sc7180_claim_bus(const struct spi_slave *slave)
+{
+	cs_change(CS_ASSERT);
+	return 0;
+}
+
+void sc7180_release_bus(const struct spi_slave *slave)
+{
+	cs_change(CS_DEASSERT);
+}
+
+static int xfer(enum qspi_mode mode, const void *dout, size_t out_bytes,
+		void *din, size_t in_bytes)
+{
+	if ((out_bytes && !dout) || (in_bytes && !din) ||
+		(in_bytes && out_bytes)) {
+		return -1;
+	}
+
+	queue_data((uint8_t *) (out_bytes ? dout : din),
+		in_bytes | out_bytes, mode, !!out_bytes);
+
+	flush_chain();
+
+	return 0;
+}
+
+int sc7180_xfer(const struct spi_slave *slave, const void *dout,
+		size_t out_bytes, void *din, size_t in_bytes)
+{
+	return xfer(SDR_1BIT, dout, out_bytes, din, in_bytes);
+}
+
+int sc7180_xfer_dual(const struct spi_slave *slave, const void *dout,
+		     size_t out_bytes, void *din, size_t in_bytes)
+{
+	return xfer(SDR_2BIT, dout, out_bytes, din, in_bytes);
+}