--- /dev/null
+/*
+ * (C) Copyright 2009
+ * Marvell Semiconductor <www.marvell.com>
+ * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
+ *
+ * Derived from drivers/spi/mpc8xxx_spi.c
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <common.h>
+#include <malloc.h>
+#include <spi.h>
+#include <asm/io.h>
+#include <asm/arch/kirkwood.h>
+#include <asm/arch/spi.h>
+#include <asm/arch/mpp.h>
+
+static struct kwspi_registers *spireg = (struct kwspi_registers *)KW_SPI_BASE;
+
+u32 cs_spi_mpp_back[2];
+
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ struct spi_slave *slave;
+ u32 data;
+ static const u32 kwspi_mpp_config[2][2] = {
+ { MPP0_SPI_SCn, 0 }, /* if cs == 0 */
+ { MPP7_SPI_SCn, 0 } /* if cs != 0 */
+ };
+
+ if (!spi_cs_is_valid(bus, cs))
+ return NULL;
+
+ slave = spi_alloc_slave_base(bus, cs);
+ if (!slave)
+ return NULL;
+
+ writel(~KWSPI_CSN_ACT | KWSPI_SMEMRDY, &spireg->ctrl);
+
+ /* calculate spi clock prescaller using max_hz */
+ data = ((CONFIG_SYS_TCLK / 2) / max_hz) + 0x10;
+ data = data < KWSPI_CLKPRESCL_MIN ? KWSPI_CLKPRESCL_MIN : data;
+ data = data > KWSPI_CLKPRESCL_MASK ? KWSPI_CLKPRESCL_MASK : data;
+
+ /* program spi clock prescaller using max_hz */
+ writel(KWSPI_ADRLEN_3BYTE | data, &spireg->cfg);
+ debug("data = 0x%08x \n", data);
+
+ writel(KWSPI_SMEMRDIRQ, &spireg->irq_cause);
+ writel(KWSPI_IRQMASK, &spireg->irq_mask);
+
+ /* program mpp registers to select SPI_CSn */
+ kirkwood_mpp_conf(kwspi_mpp_config[cs ? 1 : 0], cs_spi_mpp_back);
+
+ return slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+ kirkwood_mpp_conf(cs_spi_mpp_back, NULL);
+ free(slave);
+}
+
+#if defined(CONFIG_SYS_KW_SPI_MPP)
+u32 spi_mpp_backup[4];
+#endif
+
+__attribute__((weak)) int board_spi_claim_bus(struct spi_slave *slave)
+{
+ return 0;
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+#if defined(CONFIG_SYS_KW_SPI_MPP)
+ u32 config;
+ u32 spi_mpp_config[4];
+
+ config = CONFIG_SYS_KW_SPI_MPP;
+
+ if (config & MOSI_MPP6)
+ spi_mpp_config[0] = MPP6_SPI_MOSI;
+ else
+ spi_mpp_config[0] = MPP1_SPI_MOSI;
+
+ if (config & SCK_MPP10)
+ spi_mpp_config[1] = MPP10_SPI_SCK;
+ else
+ spi_mpp_config[1] = MPP2_SPI_SCK;
+
+ if (config & MISO_MPP11)
+ spi_mpp_config[2] = MPP11_SPI_MISO;
+ else
+ spi_mpp_config[2] = MPP3_SPI_MISO;
+
+ spi_mpp_config[3] = 0;
+ spi_mpp_backup[3] = 0;
+
+ /* set new spi mpp and save current mpp config */
+ kirkwood_mpp_conf(spi_mpp_config, spi_mpp_backup);
+
+#endif
+
+ return board_spi_claim_bus(slave);
+}
+
+__attribute__((weak)) void board_spi_release_bus(struct spi_slave *slave)
+{
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+#if defined(CONFIG_SYS_KW_SPI_MPP)
+ kirkwood_mpp_conf(spi_mpp_backup, NULL);
+#endif
+
+ board_spi_release_bus(slave);
+}
+
+#ifndef CONFIG_SPI_CS_IS_VALID
+/*
+ * you can define this function board specific
+ * define above CONFIG in board specific config file and
+ * provide the function in board specific src file
+ */
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ return (bus == 0 && (cs == 0 || cs == 1));
+}
+#endif
+
+void spi_init(void)
+{
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+ writel(readl(&spireg->ctrl) | KWSPI_IRQUNMASK, &spireg->ctrl);
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ writel(readl(&spireg->ctrl) & KWSPI_IRQMASK, &spireg->ctrl);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *dout,
+ void *din, unsigned long flags)
+{
+ unsigned int tmpdout, tmpdin;
+ int tm, isread = 0;
+
+ debug("spi_xfer: slave %u:%u dout %p din %p bitlen %u\n",
+ slave->bus, slave->cs, dout, din, bitlen);
+
+ if (flags & SPI_XFER_BEGIN)
+ spi_cs_activate(slave);
+
+ /*
+ * handle data in 8-bit chunks
+ * TBD: 2byte xfer mode to be enabled
+ */
+ writel(((readl(&spireg->cfg) & ~KWSPI_XFERLEN_MASK) |
+ KWSPI_XFERLEN_1BYTE), &spireg->cfg);
+
+ while (bitlen > 4) {
+ debug("loopstart bitlen %d\n", bitlen);
+ tmpdout = 0;
+
+ /* Shift data so it's msb-justified */
+ if (dout)
+ tmpdout = *(u32 *) dout & 0x0ff;
+
+ writel(~KWSPI_SMEMRDIRQ, &spireg->irq_cause);
+ writel(tmpdout, &spireg->dout); /* Write the data out */
+ debug("*** spi_xfer: ... %08x written, bitlen %d\n",
+ tmpdout, bitlen);
+
+ /*
+ * Wait for SPI transmit to get out
+ * or time out (1 second = 1000 ms)
+ * The NE event must be read and cleared first
+ */
+ for (tm = 0, isread = 0; tm < KWSPI_TIMEOUT; ++tm) {
+ if (readl(&spireg->irq_cause) & KWSPI_SMEMRDIRQ) {
+ isread = 1;
+ tmpdin = readl(&spireg->din);
+ debug
+ ("spi_xfer: din %p..%08x read\n",
+ din, tmpdin);
+
+ if (din) {
+ *((u8 *) din) = (u8) tmpdin;
+ din += 1;
+ }
+ if (dout)
+ dout += 1;
+ bitlen -= 8;
+ }
+ if (isread)
+ break;
+ }
+ if (tm >= KWSPI_TIMEOUT)
+ printf("*** spi_xfer: Time out during SPI transfer\n");
+
+ debug("loopend bitlen %d\n", bitlen);
+ }
+
+ if (flags & SPI_XFER_END)
+ spi_cs_deactivate(slave);
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff