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path: root/drivers/spi/nds_ae3xx_spi.c
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Diffstat (limited to 'drivers/spi/nds_ae3xx_spi.c')
-rw-r--r--drivers/spi/nds_ae3xx_spi.c499
1 files changed, 499 insertions, 0 deletions
diff --git a/drivers/spi/nds_ae3xx_spi.c b/drivers/spi/nds_ae3xx_spi.c
new file mode 100644
index 0000000000..f5bd99a605
--- /dev/null
+++ b/drivers/spi/nds_ae3xx_spi.c
@@ -0,0 +1,499 @@
+/*
+ * NDS SPI controller driver.
+ *
+ * Copyright 2017 Andes Technology, Inc.
+ * Author: Rick Chen (rick@andestech.com)
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <clk.h>
+#include <common.h>
+#include <malloc.h>
+#include <spi.h>
+#include <asm/io.h>
+#include <dm.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+#define MAX_TRANSFER_LEN 512
+#define CHUNK_SIZE 1
+#define SPI_TIMEOUT 0x100000
+#define SPI0_BUS 0
+#define SPI1_BUS 1
+#define SPI0_BASE 0xf0b00000
+#define SPI1_BASE 0xf0f00000
+#define NSPI_MAX_CS_NUM 1
+
+struct ae3xx_spi_regs {
+ u32 rev;
+ u32 reserve1[3];
+ u32 format; /* 0x10 */
+#define DATA_LENGTH(x) ((x-1)<<8)
+ u32 pio;
+ u32 reserve2[2];
+ u32 tctrl; /* 0x20 */
+#define TRAMODE_OFFSET 24
+#define TRAMODE_MASK (0x0F<<TRAMODE_OFFSET)
+#define TRAMODE_WR_SYNC (0<<TRAMODE_OFFSET)
+#define TRAMODE_WO (1<<TRAMODE_OFFSET)
+#define TRAMODE_RO (2<<TRAMODE_OFFSET)
+#define TRAMODE_WR (3<<TRAMODE_OFFSET)
+#define TRAMODE_RW (4<<TRAMODE_OFFSET)
+#define TRAMODE_WDR (5<<TRAMODE_OFFSET)
+#define TRAMODE_RDW (6<<TRAMODE_OFFSET)
+#define TRAMODE_NONE (7<<TRAMODE_OFFSET)
+#define TRAMODE_DW (8<<TRAMODE_OFFSET)
+#define TRAMODE_DR (9<<TRAMODE_OFFSET)
+#define WCNT_OFFSET 12
+#define WCNT_MASK (0x1FF<<WCNT_OFFSET)
+#define RCNT_OFFSET 0
+#define RCNT_MASK (0x1FF<<RCNT_OFFSET)
+ u32 cmd;
+ u32 addr;
+ u32 data;
+ u32 ctrl; /* 0x30 */
+#define TXFTH_OFFSET 16
+#define RXFTH_OFFSET 8
+#define TXDMAEN (1<<4)
+#define RXDMAEN (1<<3)
+#define TXFRST (1<<2)
+#define RXFRST (1<<1)
+#define SPIRST (1<<0)
+ u32 status;
+#define TXFFL (1<<23)
+#define TXEPTY (1<<22)
+#define TXFVE_MASK (0x1F<<16)
+#define RXFEM (1<<14)
+#define RXFVE_OFFSET (8)
+#define RXFVE_MASK (0x1F<<RXFVE_OFFSET)
+#define SPIBSY (1<<0)
+ u32 inten;
+ u32 intsta;
+ u32 timing; /* 0x40 */
+#define SCLK_DIV_MASK 0xFF
+};
+
+struct nds_spi_slave {
+#ifndef CONFIG_DM_SPI
+ struct spi_slave slave;
+#endif
+ volatile struct ae3xx_spi_regs *regs;
+ int to;
+ unsigned int freq;
+ ulong clock;
+ unsigned int mode;
+ u8 num_cs;
+ unsigned int mtiming;
+ size_t cmd_len;
+ u8 cmd_buf[16];
+ size_t data_len;
+ size_t tran_len;
+ u8 *din;
+ u8 *dout;
+ unsigned int max_transfer_length;
+};
+
+static int __ae3xx_spi_set_speed(struct nds_spi_slave *ns)
+{
+ u32 tm;
+ u8 div;
+ tm = ns->regs->timing;
+ tm &= ~SCLK_DIV_MASK;
+
+ if(ns->freq >= ns->clock)
+ div =0xff;
+ else{
+ for (div = 0; div < 0xff; div++) {
+ if (ns->freq >= ns->clock / (2 * (div + 1)))
+ break;
+ }
+ }
+
+ tm |= div;
+ ns->regs->timing = tm;
+
+ return 0;
+
+}
+
+static int __ae3xx_spi_claim_bus(struct nds_spi_slave *ns)
+{
+ unsigned int format=0;
+ ns->regs->ctrl |= (TXFRST|RXFRST|SPIRST);
+ while((ns->regs->ctrl &(TXFRST|RXFRST|SPIRST))&&(ns->to--))
+ if(!ns->to)
+ return -EINVAL;
+
+ ns->cmd_len = 0;
+ format = ns->mode|DATA_LENGTH(8);
+ ns->regs->format = format;
+ __ae3xx_spi_set_speed(ns);
+
+ return 0;
+}
+
+static int __ae3xx_spi_release_bus(struct nds_spi_slave *ns)
+{
+ /* do nothing */
+ return 0;
+}
+
+static int __ae3xx_spi_start(struct nds_spi_slave *ns)
+{
+ int i,olen=0;
+ int tc = ns->regs->tctrl;
+
+ tc &= ~(WCNT_MASK|RCNT_MASK|TRAMODE_MASK);
+ if ((ns->din)&&(ns->cmd_len))
+ tc |= TRAMODE_WR;
+ else if (ns->din)
+ tc |= TRAMODE_RO;
+ else
+ tc |= TRAMODE_WO;
+
+ if(ns->dout)
+ olen = ns->tran_len;
+ tc |= (ns->cmd_len+olen-1) << WCNT_OFFSET;
+
+ if(ns->din)
+ tc |= (ns->tran_len-1) << RCNT_OFFSET;
+
+ ns->regs->tctrl = tc;
+ ns->regs->cmd = 1;
+
+ for (i=0;i<ns->cmd_len;i++)
+ ns->regs->data = ns->cmd_buf[i];
+
+ return 0;
+}
+
+static int __ae3xx_spi_stop(struct nds_spi_slave *ns)
+{
+ ns->regs->timing = ns->mtiming;
+ while ((ns->regs->status & SPIBSY)&&(ns->to--))
+ if (!ns->to)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void __nspi_espi_tx(struct nds_spi_slave *ns, const void *dout)
+{
+ ns->regs->data = *(u8 *)dout;
+}
+
+static int __nspi_espi_rx(struct nds_spi_slave *ns, void *din, unsigned int bytes)
+{
+ *(u8 *)din = ns->regs->data;
+ return bytes;
+}
+
+
+static int __ae3xx_spi_xfer(struct nds_spi_slave *ns,
+ unsigned int bitlen, const void *data_out, void *data_in,
+ unsigned long flags)
+{
+ unsigned int event, rx_bytes;
+ const void *dout = NULL;
+ void *din = NULL;
+ int num_blks, num_chunks, max_tran_len, tran_len;
+ int num_bytes;
+ u8 *cmd_buf = ns->cmd_buf;
+ size_t cmd_len = ns->cmd_len;
+ size_t data_len = bitlen / 8;
+ int rf_cnt;
+ int ret = 0;
+
+ max_tran_len = ns->max_transfer_length;
+ switch (flags) {
+ case SPI_XFER_BEGIN:
+ cmd_len = ns->cmd_len = data_len;
+ memcpy(cmd_buf, data_out, cmd_len);
+ return 0;
+
+ case 0:
+ case SPI_XFER_END:
+ if (bitlen == 0) {
+ return 0;
+ }
+ ns->data_len = data_len;
+ ns->din = (u8 *)data_in;
+ ns->dout = (u8 *)data_out;
+ break;
+
+ case SPI_XFER_BEGIN | SPI_XFER_END:
+ ns->data_len = 0;
+ ns->din = 0;
+ ns->dout = 0;
+ cmd_len = ns->cmd_len = data_len;
+ memcpy(cmd_buf, data_out, cmd_len);
+ data_out = 0;
+ data_len = 0;
+ __ae3xx_spi_start(ns);
+ break;
+ }
+ debug("spi_xfer: data_out %08X(%p) data_in %08X(%p) data_len %u\n",
+ *(uint *)data_out, data_out, *(uint *)data_in, data_in, data_len);
+ num_chunks = DIV_ROUND_UP(data_len, max_tran_len);
+ din = data_in;
+ dout = data_out;
+ while (num_chunks--) {
+ tran_len = min(data_len, (size_t)max_tran_len);
+ ns->tran_len = tran_len;
+ num_blks = DIV_ROUND_UP(tran_len , CHUNK_SIZE);
+ num_bytes = (tran_len) % CHUNK_SIZE;
+ if(num_bytes == 0)
+ num_bytes = CHUNK_SIZE;
+ __ae3xx_spi_start(ns);
+
+ while (num_blks) {
+ event = in_le32(&ns->regs->status);
+ if ((event & TXEPTY) && (data_out)) {
+ __nspi_espi_tx(ns, dout);
+ num_blks -= CHUNK_SIZE;
+ dout += CHUNK_SIZE;
+ }
+
+ if ((event & RXFVE_MASK) && (data_in)) {
+ rf_cnt = ((event & RXFVE_MASK)>> RXFVE_OFFSET);
+ if (rf_cnt >= CHUNK_SIZE)
+ rx_bytes = CHUNK_SIZE;
+ else if (num_blks == 1 && rf_cnt == num_bytes)
+ rx_bytes = num_bytes;
+ else
+ continue;
+
+ if (__nspi_espi_rx(ns, din, rx_bytes) == rx_bytes) {
+ num_blks -= CHUNK_SIZE;
+ din = (unsigned char *)din + rx_bytes;
+ }
+ }
+ }
+
+ data_len -= tran_len;
+ if(data_len)
+ {
+ ns->cmd_buf[1] += ((tran_len>>16)&0xff);
+ ns->cmd_buf[2] += ((tran_len>>8)&0xff);
+ ns->cmd_buf[3] += ((tran_len)&0xff);
+ ns->data_len = data_len;
+ }
+ ret = __ae3xx_spi_stop(ns);
+ }
+ ret = __ae3xx_spi_stop(ns);
+
+ return ret;
+}
+
+#ifndef CONFIG_DM_SPI
+#define to_nds_spi_slave(s) container_of(s, struct nds_spi_slave, slave)
+struct spi_slave *spi_setup_slave(unsigned int bus, unsigned int cs,
+ unsigned int max_hz, unsigned int mode)
+{
+ struct nds_spi_slave *ns;
+
+ if (!spi_cs_is_valid(bus, cs))
+ return NULL;
+
+ ns = spi_alloc_slave(struct nds_spi_slave, bus, cs);
+
+ switch (bus) {
+ case SPI0_BUS:
+ ns->regs = (struct ae3xx_spi_regs *)SPI0_BASE;
+ break;
+
+ case SPI1_BUS:
+ ns->regs = (struct ae3xx_spi_regs *)SPI1_BASE;
+ break;
+
+ default:
+ return NULL;
+ }
+
+ ns->freq= max_hz;
+ ns->mode = mode;
+ ns->to = SPI_TIMEOUT;
+ ns->max_transfer_length = MAX_TRANSFER_LEN;
+ ns->slave.max_write_size = MAX_TRANSFER_LEN;
+ if (!ns)
+ return NULL;
+
+ return &ns->slave;
+}
+
+void spi_free_slave(struct spi_slave *slave)
+{
+ struct nds_spi_slave *ns = to_nds_spi_slave(slave);
+ free(ns);
+}
+
+void spi_init(void)
+{
+ /* do nothing */
+}
+
+int spi_claim_bus(struct spi_slave *slave)
+{
+ struct nds_spi_slave *ns = to_nds_spi_slave(slave);
+ return __ae3xx_spi_claim_bus(ns);
+}
+
+void spi_release_bus(struct spi_slave *slave)
+{
+ struct nds_spi_slave *ns = to_nds_spi_slave(slave);
+ __ae3xx_spi_release_bus(ns);
+}
+
+int spi_xfer(struct spi_slave *slave, unsigned int bitlen, const void *data_out,
+ void *data_in, unsigned long flags)
+{
+ struct nds_spi_slave *ns = to_nds_spi_slave(slave);
+ return __ae3xx_spi_xfer(ns, bitlen, data_out, data_in, flags);
+}
+
+int spi_cs_is_valid(unsigned int bus, unsigned int cs)
+{
+ return bus == 0 && cs < NSPI_MAX_CS_NUM;
+}
+
+void spi_cs_activate(struct spi_slave *slave)
+{
+ struct nds_spi_slave *ns = to_nds_spi_slave(slave);
+ __ae3xx_spi_start(ns);
+}
+
+void spi_cs_deactivate(struct spi_slave *slave)
+{
+ struct nds_spi_slave *ns = to_nds_spi_slave(slave);
+ __ae3xx_spi_stop(ns);
+}
+#else
+static int ae3xx_spi_set_speed(struct udevice *bus, uint max_hz)
+{
+ struct nds_spi_slave *ns = dev_get_priv(bus);
+
+ debug("%s speed %u\n", __func__, max_hz);
+
+ ns->freq = max_hz;
+ __ae3xx_spi_set_speed(ns);
+
+ return 0;
+}
+
+static int ae3xx_spi_set_mode(struct udevice *bus, uint mode)
+{
+ struct nds_spi_slave *ns = dev_get_priv(bus);
+
+ debug("%s mode %u\n", __func__, mode);
+ ns->mode = mode;
+
+ return 0;
+}
+
+static int ae3xx_spi_claim_bus(struct udevice *dev)
+{
+ struct dm_spi_slave_platdata *slave_plat =
+ dev_get_parent_platdata(dev);
+ struct udevice *bus = dev->parent;
+ struct nds_spi_slave *ns = dev_get_priv(bus);
+
+ if (slave_plat->cs >= ns->num_cs) {
+ printf("Invalid SPI chipselect\n");
+ return -EINVAL;
+ }
+
+ return __ae3xx_spi_claim_bus(ns);
+}
+
+static int ae3xx_spi_release_bus(struct udevice *dev)
+{
+ struct nds_spi_slave *ns = dev_get_priv(dev->parent);
+
+ return __ae3xx_spi_release_bus(ns);
+}
+
+static int ae3xx_spi_xfer(struct udevice *dev, unsigned int bitlen,
+ const void *dout, void *din,
+ unsigned long flags)
+{
+ struct udevice *bus = dev->parent;
+ struct nds_spi_slave *ns = dev_get_priv(bus);
+
+ return __ae3xx_spi_xfer(ns, bitlen, dout, din, flags);
+}
+
+static int ae3xx_spi_get_clk(struct udevice *bus)
+{
+ struct nds_spi_slave *ns = dev_get_priv(bus);
+ struct clk clk;
+ ulong clk_rate;
+ int ret;
+
+ ret = clk_get_by_index(bus, 0, &clk);
+ if (ret)
+ return -EINVAL;
+
+ clk_rate = clk_get_rate(&clk);
+ if (!clk_rate)
+ return -EINVAL;
+
+ ns->clock = clk_rate;
+ clk_free(&clk);
+
+ return 0;
+}
+
+static int ae3xx_spi_probe(struct udevice *bus)
+{
+ struct nds_spi_slave *ns = dev_get_priv(bus);
+
+ ns->to = SPI_TIMEOUT;
+ ns->max_transfer_length = MAX_TRANSFER_LEN;
+ ns->mtiming = ns->regs->timing;
+ ae3xx_spi_get_clk(bus);
+
+ return 0;
+}
+
+static int ae3xx_ofdata_to_platadata(struct udevice *bus)
+{
+ struct nds_spi_slave *ns = dev_get_priv(bus);
+ const void *blob = gd->fdt_blob;
+ int node = dev_of_offset(bus);
+
+ ns->regs = map_physmem(devfdt_get_addr(bus),
+ sizeof(struct ae3xx_spi_regs),
+ MAP_NOCACHE);
+ if (!ns->regs) {
+ printf("%s: could not map device address\n", __func__);
+ return -EINVAL;
+ }
+ ns->num_cs = fdtdec_get_int(blob, node, "num-cs", 4);
+
+ return 0;
+}
+
+static const struct dm_spi_ops ae3xx_spi_ops = {
+ .claim_bus = ae3xx_spi_claim_bus,
+ .release_bus = ae3xx_spi_release_bus,
+ .xfer = ae3xx_spi_xfer,
+ .set_speed = ae3xx_spi_set_speed,
+ .set_mode = ae3xx_spi_set_mode,
+};
+
+static const struct udevice_id ae3xx_spi_ids[] = {
+ { .compatible = "andestech,atcspi200" },
+ { }
+};
+
+U_BOOT_DRIVER(ae3xx_spi) = {
+ .name = "ae3xx_spi",
+ .id = UCLASS_SPI,
+ .of_match = ae3xx_spi_ids,
+ .ops = &ae3xx_spi_ops,
+ .ofdata_to_platdata = ae3xx_ofdata_to_platadata,
+ .priv_auto_alloc_size = sizeof(struct nds_spi_slave),
+ .probe = ae3xx_spi_probe,
+};
+#endif
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