summaryrefslogtreecommitdiff
path: root/src/soc/rockchip/rk3288/spi.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/soc/rockchip/rk3288/spi.c')
-rwxr-xr-xsrc/soc/rockchip/rk3288/spi.c318
1 files changed, 318 insertions, 0 deletions
diff --git a/src/soc/rockchip/rk3288/spi.c b/src/soc/rockchip/rk3288/spi.c
new file mode 100755
index 0000000000..396f537a01
--- /dev/null
+++ b/src/soc/rockchip/rk3288/spi.c
@@ -0,0 +1,318 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Rockchip Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <console/console.h>
+#include <arch/io.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <spi-generic.h>
+#include <spi_flash.h>
+#include <delay.h>
+#include <timer.h>
+#include <endian.h>
+#include "addressmap.h"
+#include "spi.h"
+#include "clock.h"
+
+struct rockchip_spi_slave {
+ struct spi_slave slave;
+ struct rockchip_spi *regs;
+ unsigned int speed_hz;
+ unsigned int fifo_size;
+};
+
+#define SPI_TIMEOUT_US 1000
+#define SPI_SRCCLK_HZ 99000000
+
+static struct rockchip_spi_slave rockchip_spi_slaves[3] = {
+ {
+ .slave = {
+ .bus = 0,
+ .rw = SPI_READ_FLAG | SPI_WRITE_FLAG,
+ },
+ .regs = (void *)SPI0_BASE,
+ .speed_hz = 9000000,
+ .fifo_size = 32,
+ },
+ {
+ .slave = {.bus = 1, .rw = SPI_READ_FLAG,},
+ .regs = (void *)SPI1_BASE,
+ .speed_hz = 11000000,
+ .fifo_size = 32,
+ },
+ {
+ .slave = {
+ .bus = 2,
+ .rw = SPI_READ_FLAG | SPI_WRITE_FLAG,
+ },
+ .regs = (void *)SPI2_BASE,
+ .speed_hz = 11000000,
+ .fifo_size = 32,
+ },
+
+};
+
+static struct rockchip_spi_slave *to_rockchip_spi(struct spi_slave *slave)
+{
+ return container_of(slave, struct rockchip_spi_slave, slave);
+}
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs)
+{
+ assert(bus >= 0 && bus < 3);
+ return &(rockchip_spi_slaves[bus].slave);
+}
+
+static void spi_cs_activate(struct spi_slave *slave)
+{
+ struct rockchip_spi *regs = to_rockchip_spi(slave)->regs;
+ setbits_le32(&regs->ser, 1);
+}
+
+static void spi_cs_deactivate(struct spi_slave *slave)
+{
+ struct rockchip_spi *regs = to_rockchip_spi(slave)->regs;
+ clrbits_le32(&regs->ser, 1);
+}
+
+static void rockchip_spi_enable_chip(struct rockchip_spi *regs, int enable)
+{
+ if (enable == 1)
+ writel(1, &regs->spienr);
+ else
+ writel(0, &regs->spienr);
+}
+
+static void rockchip_spi_set_clk(struct rockchip_spi *regs, unsigned int hz)
+{
+ unsigned short clk_div = 0;
+
+ /* Calculate clock divisor. */
+ clk_div = SPI_SRCCLK_HZ / hz;
+ clk_div = (clk_div + 1) & 0xfffe;
+ assert((clk_div - 1) * hz == SPI_SRCCLK_HZ);
+ writel(clk_div, &regs->baudr);
+}
+
+void rockchip_spi_init(unsigned int bus)
+{
+ struct rockchip_spi_slave *espi = &rockchip_spi_slaves[bus];
+ struct rockchip_spi *regs = espi->regs;
+ unsigned int ctrlr0 = 0;
+
+ rkclk_configure_spi(bus, SPI_SRCCLK_HZ);
+ rockchip_spi_enable_chip(regs, 0);
+ rockchip_spi_set_clk(regs, espi->speed_hz);
+
+ /* Operation Mode */
+ ctrlr0 = (SPI_OMOD_MASTER << SPI_OMOD_OFFSET);
+
+ /* Data Frame Size */
+ ctrlr0 |= SPI_DFS_8BIT << SPI_DFS_OFFSET;
+
+ /* Chip Select Mode */
+ ctrlr0 |= (SPI_CSM_KEEP << SPI_CSM_OFFSET);
+
+ /* SSN to Sclk_out delay */
+ ctrlr0 |= (SPI_SSN_DELAY_ONE << SPI_SSN_DELAY_OFFSET);
+
+ /* Serial Endian Mode */
+ ctrlr0 |= (SPI_SEM_LITTLE << SPI_SEM_OFFSET);
+
+ /* First Bit Mode */
+ ctrlr0 |= (SPI_FBM_MSB << SPI_FBM_OFFSET);
+
+ /* Byte and Halfword Transform */
+ ctrlr0 |= (SPI_APB_8BIT << SPI_HALF_WORLD_TX_OFFSET);
+
+ /* Rxd Sample Delay */
+ ctrlr0 |= (0 << SPI_RXDSD_OFFSET);
+
+ /* Frame Format */
+ ctrlr0 |= (SPI_FRF_SPI << SPI_FRF_OFFSET);
+
+ writel(ctrlr0, &regs->ctrlr0);
+
+ /*fifo depth */
+ writel(espi->fifo_size / 2 - 1, &regs->txftlr);
+ writel(espi->fifo_size / 2 - 1, &regs->rxftlr);
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+ spi_cs_activate(slave);
+ return 0;
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ spi_cs_deactivate(slave);
+}
+
+static int rockchip_spi_wait_till_not_busy(struct rockchip_spi *regs)
+{
+ struct mono_time start;
+ struct rela_time rt;
+ timer_monotonic_get(&start);
+ do {
+ if (!(readl(&regs->sr) & SR_BUSY))
+ return 0;
+ rt = current_time_from(&start);
+ } while (rela_time_in_microseconds(&rt) < SPI_TIMEOUT_US);
+ printk(BIOS_DEBUG,
+ "RK SPI: Status keeps busy for 1000us after a read/write!\n");
+ return -1;
+}
+
+int spi_xfer(struct spi_slave *slave, const void *dout, unsigned int sout,
+ void *din, unsigned int sin)
+{
+ unsigned int len;
+ unsigned int bytes_remaining;
+ uint8_t *p;
+ struct rockchip_spi *regs = to_rockchip_spi(slave)->regs;
+ struct rockchip_spi_slave *espi = to_rockchip_spi(slave);
+
+ if (dout) {
+ len = sout;
+ p = (uint8_t *) dout;
+ bytes_remaining = len;
+ writel(0, &regs->spienr); /*disable spi */
+ writel(len - 1, &regs->ctrlr1); /*wrtie len */
+
+ /*tx only */
+ clrsetbits_le32(&regs->ctrlr0, SPI_TMOD_MASK << SPI_TMOD_OFFSET,
+ SPI_TMOD_TO << SPI_TMOD_OFFSET);
+ writel(1, &regs->spienr);/*enable spi */
+ while (bytes_remaining) {
+ if ((readl(&regs->txflr) & 0x3f)
+ < espi->fifo_size) {
+ writel(*p++, &regs->txdr);
+ bytes_remaining--;
+ }
+ }
+ if (rockchip_spi_wait_till_not_busy(regs))
+ return -1;
+ }
+ if (din) {
+ len = sin;
+ p = (uint8_t *) din;
+ writel(0, &regs->spienr); /*disable spi */
+ writel(len - 1, &regs->ctrlr1); /*write len */
+
+ /*rx only */
+ clrsetbits_le32(&regs->ctrlr0, SPI_TMOD_MASK << SPI_TMOD_OFFSET,
+ SPI_TMOD_RO << SPI_TMOD_OFFSET);
+ while (len) {
+ writel(0, &regs->spienr);/*disable spi */
+ bytes_remaining = MIN(len, 0xffff);
+ writel(bytes_remaining - 1, &regs->ctrlr1);
+ len -= bytes_remaining;
+ writel(1, &regs->spienr);/*enable spi */
+ while (bytes_remaining) {
+ if (readl(&regs->rxflr) & 0x3f) {
+ *p = readl(&regs->rxdr) & 0xff;
+ p += 1;
+ bytes_remaining--;
+ }
+ }
+ }
+ if (rockchip_spi_wait_till_not_busy(regs))
+ return -1;
+ }
+ return 0;
+}
+
+static int rockchip_spi_read(struct spi_slave *slave, void *dest, uint32_t len,
+ uint32_t off)
+{
+ unsigned int cmd;
+
+ spi_claim_bus(slave);
+ cmd = swab32(off) | SF_READ_DATA_CMD;
+ if (spi_xfer(slave, &cmd, sizeof(cmd), dest, len)) {
+ printk(BIOS_DEBUG, "rockchip_spi_read err\n");
+ spi_release_bus(slave);
+ return -1;
+ }
+ spi_release_bus(slave);
+ return len;
+}
+
+struct rockchip_spi_media {
+ struct spi_slave *slave;
+ struct cbfs_simple_buffer buffer;
+};
+
+static int rockchip_spi_cbfs_open(struct cbfs_media *media)
+{
+ return 0;
+}
+
+static int rockchip_spi_cbfs_close(struct cbfs_media *media)
+{
+ return 0;
+}
+
+static size_t rockchip_spi_cbfs_read(struct cbfs_media *media, void *dest,
+ size_t offset, size_t count)
+{
+ struct rockchip_spi_media *spi =
+ (struct rockchip_spi_media *)media->context;
+
+ return rockchip_spi_read(spi->slave, dest, count, offset);
+}
+
+static void *rockchip_spi_cbfs_map(struct cbfs_media *media, size_t offset,
+ size_t count)
+{
+ struct rockchip_spi_media *spi =
+ (struct rockchip_spi_media *)media->context;
+
+ count = ALIGN_UP(count, 4);
+
+ return cbfs_simple_buffer_map(&spi->buffer, media, offset, count);
+}
+
+static void *rockchip_spi_cbfs_unmap(struct cbfs_media *media,
+ const void *address)
+{
+ struct rockchip_spi_media *spi =
+ (struct rockchip_spi_media *)media->context;
+ return cbfs_simple_buffer_unmap(&spi->buffer, address);
+}
+
+int initialize_rockchip_spi_cbfs_media(struct cbfs_media *media,
+ void *buffer_address, size_t buffer_size)
+{
+ static struct rockchip_spi_media context;
+ static struct rockchip_spi_slave *eslave = &rockchip_spi_slaves[2];
+ context.slave = &eslave->slave;
+ context.buffer.allocated = context.buffer.last_allocate = 0;
+ context.buffer.buffer = buffer_address;
+ context.buffer.size = buffer_size;
+ media->context = (void *)&context;
+ media->open = rockchip_spi_cbfs_open;
+ media->close = rockchip_spi_cbfs_close;
+ media->read = rockchip_spi_cbfs_read;
+ media->map = rockchip_spi_cbfs_map;
+ media->unmap = rockchip_spi_cbfs_unmap;
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 22:51:37 +0000