[PATCH 07/10] spi: spi-dw-mchp: Add Sparx5 support

Lars Povlsen
2020-05-13T14:01:09Z

This adds support for the Sparx5 SoC in the spi-dw-mchp SPI controller.

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lars Povlsen <lars.povlsen@microchip.com>
---
drivers/spi/spi-dw-mchp.c | 211 ++++++++++++++++++++++++++++++++++----
1 file changed, 189 insertions(+), 22 deletions(-)

diff --git a/drivers/spi/spi-dw-mchp.c b/drivers/spi/spi-dw-mchp.c
index 0828a7616d9ab..3abdd44a550ea 100644
--- a/drivers/spi/spi-dw-mchp.c
+++ b/drivers/spi/spi-dw-mchp.c
@@ -28,21 +28,22 @@

#define MAX_CS 4

-#define MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL 0x24
-#define OCELOT_IF_SI_OWNER_OFFSET 4
-#define JAGUAR2_IF_SI_OWNER_OFFSET 6
#define MSCC_IF_SI_OWNER_MASK GENMASK(1, 0)
#define MSCC_IF_SI_OWNER_SISL 0
#define MSCC_IF_SI_OWNER_SIBM 1
#define MSCC_IF_SI_OWNER_SIMC 2

#define MSCC_SPI_MST_SW_MODE 0x14
-#define MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE BIT(13)
-#define MSCC_SPI_MST_SW_MODE_SW_SPI_CS(x) (x << 5)

struct dw_spi_mchp_props {
const char *syscon_name;
- u32 si_owner_bit;
+ u32 general_ctrl_off;
+ u32 si_owner_bit, si_owner2_bit;
+ u32 pinctrl_bit_off;
+ u32 cs_bit_off;
+ u32 ss_force_ena_off;
+ u32 ss_force_val_off;
+ u32 bootmaster_cs;
};

struct dw_spi_mchp {
@@ -53,44 +54,176 @@ struct dw_spi_mchp {
void __iomem *spi_mst;
const struct dw_spi_mchp_props *props;
u32 gen_owner;
+ u32 if2mask;
};

static const struct dw_spi_mchp_props dw_spi_mchp_props_ocelot = {
.syscon_name = "mscc,ocelot-cpu-syscon",
+ .general_ctrl_off = 0x24,
.si_owner_bit = 4,
+ .pinctrl_bit_off = 13,
+ .cs_bit_off = 5,
+ .bootmaster_cs = 0,
};

static const struct dw_spi_mchp_props dw_spi_mchp_props_jaguar2 = {
.syscon_name = "mscc,ocelot-cpu-syscon",
+ .general_ctrl_off = 0x24,
.si_owner_bit = 6,
+ .pinctrl_bit_off = 13,
+ .cs_bit_off = 5,
+ .bootmaster_cs = 0,
+};
+
+static const struct dw_spi_mchp_props dw_spi_mchp_props_sparx5 = {
+ .syscon_name = "microchip,sparx5-cpu-syscon",
+ .general_ctrl_off = 0x88,
+ .si_owner_bit = 6,
+ .si_owner2_bit = 4,
+ .ss_force_ena_off = 0xa4,
+ .ss_force_val_off = 0xa8,
+ .bootmaster_cs = 0,
};

/*
- * The Designware SPI controller (referred to as master in the documentation)
- * automatically deasserts chip select when the tx fifo is empty. The chip
- * selects then needs to be either driven as GPIOs or, for the first 4 using the
- * the SPI boot controller registers. the final chip select is an OR gate
- * between the Designware SPI controller and the SPI boot controller.
+ * Set the owner of the SPI interface
*/
-static void dw_spi_mchp_set_cs(struct spi_device *spi, bool enable)
+static void dw_spi_mchp_set_owner(struct dw_spi_mchp *dwsmchp,
+ const struct dw_spi_mchp_props *props,
+ u8 owner, u8 owner2)
+{
+ u32 val, msk;
+
+ val = (owner << props->si_owner_bit);
+ msk = (MSCC_IF_SI_OWNER_MASK << props->si_owner_bit);
+ if (props->si_owner2_bit) {
+ val |= owner2 << props->si_owner2_bit;
+ msk |= (MSCC_IF_SI_OWNER_MASK << props->si_owner2_bit);
+ }
+ if (dwsmchp->gen_owner != val) {
+ regmap_update_bits(dwsmchp->syscon, props->general_ctrl_off,
+ msk, val);
+ dwsmchp->gen_owner = val;
+ }
+}
+
+static void dw_spi_mchp_set_cs_owner(struct dw_spi_mchp *dwsmchp,
+ const struct dw_spi_mchp_props *props,
+ u8 cs, u8 owner)
{
+ u8 dummy = (owner == MSCC_IF_SI_OWNER_SIBM ?
+ MSCC_IF_SI_OWNER_SIMC : MSCC_IF_SI_OWNER_SIBM);
+ if (props->si_owner2_bit && (dwsmchp->if2mask & BIT(cs))) {
+ /* SPI2 */
+ dw_spi_mchp_set_owner(dwsmchp, props, dummy, owner);
+ } else {
+ /* SPI1 */
+ dw_spi_mchp_set_owner(dwsmchp, props, owner, dummy);
+ }
+}
+
+/*
+ * The Designware SPI controller (referred to as master in the
+ * documentation) automatically deasserts chip select when the tx fifo
+ * is empty. The chip selects then needs to be either driven as GPIOs
+ * or, for the first 4 using the the SPI boot controller
+ * registers. the final chip select is an OR gate between the
+ * Designware SPI controller and the SPI boot controller. nselect is
+ * an active low signal
+ */
+static void dw_spi_mchp_set_cs(struct spi_device *spi, bool nEnable)
+{
+ bool enable = !nEnable; /* This keeps changing in the API... */
struct dw_spi *dws = spi_master_get_devdata(spi->master);
struct dw_spi_mchp *dwsmchp = container_of(dws, struct dw_spi_mchp,
dws);
- u32 cs = spi->chip_select;
+ const struct dw_spi_mchp_props *props = dwsmchp->props;
+ u8 cs = spi->chip_select;

- if (cs < 4) {
- u32 sw_mode = MSCC_SPI_MST_SW_MODE_SW_PIN_CTRL_MODE;
+ if (enable)
+ dw_spi_mchp_set_cs_owner(dwsmchp, props, cs,
+ MSCC_IF_SI_OWNER_SIMC);

- if (!enable)
- sw_mode |= MSCC_SPI_MST_SW_MODE_SW_SPI_CS(BIT(cs));
+ if (dwsmchp->spi_mst && (cs < MAX_CS)) {
+ u32 sw_mode;

+ if (enable)
+ sw_mode = BIT(props->pinctrl_bit_off) |
+ (BIT(cs) << props->cs_bit_off);
+ else
+ sw_mode = 0;
writel(sw_mode, dwsmchp->spi_mst + MSCC_SPI_MST_SW_MODE);
+ } else if (props->ss_force_ena_off) {
+ if (enable) {
+ /* Ensure CS toggles, so start off all disabled */
+ regmap_write(dwsmchp->syscon, props->ss_force_val_off,
+ ~0);
+ /* CS override drive enable */
+ regmap_write(dwsmchp->syscon, props->ss_force_ena_off,
+ 1);
+ /* Allow settle */
+ udelay(1);
+ /* Now set CSx enabled */
+ regmap_write(dwsmchp->syscon, props->ss_force_val_off,
+ ~BIT(cs));
+ } else {
+ /* CS value */
+ regmap_write(dwsmchp->syscon, props->ss_force_val_off,
+ ~0);
+ /* CS override drive disable */
+ regmap_write(dwsmchp->syscon, props->ss_force_ena_off,
+ 0);
+ }
}

- dw_spi_set_cs(spi, enable);
+ dw_spi_set_cs(spi, nEnable);
+}
+
+static int dw_mchp_bootmaster_exec_mem_op(struct spi_mem *mem,
+ const struct spi_mem_op *op)
+{
+ struct spi_device *spi = mem->spi;
+ int ret = -ENOTSUPP;
+
+ /* Only reads, addrsize 1..4 */
+ if (!op->data.nbytes || !op->addr.nbytes || op->addr.nbytes > 4 ||
+ op->data.dir != SPI_MEM_DATA_IN)
+ return ret;
+
+ /* Only handle (normal+fast) 3/4 bytes read */
+ if (op->cmd.opcode != SPINOR_OP_READ &&
+ op->cmd.opcode != SPINOR_OP_READ_FAST &&
+ op->cmd.opcode != SPINOR_OP_READ_4B &&
+ op->cmd.opcode != SPINOR_OP_READ_FAST_4B)
+ return ret;
+
+ /* CS0..3, only 16M reach */
+ if ((spi->chip_select < MAX_CS) &&
+ (op->addr.val + op->data.nbytes) < SZ_16M) {
+ struct dw_spi *dws = spi_master_get_devdata(spi->master);
+ struct dw_spi_mchp *dwsmchp = container_of(dws,
+ struct dw_spi_mchp,
+ dws);
+ const struct dw_spi_mchp_props *props = dwsmchp->props;
+ u8 __iomem *src = dwsmchp->read_map +
+ (spi->chip_select * SZ_16M) + op->addr.val;
+
+ if (props->bootmaster_cs != spi->chip_select)
+ return ret;
+
+ /* Make boot master owner of SI interface */
+ dw_spi_mchp_set_cs_owner(dwsmchp, props, spi->chip_select,
+ MSCC_IF_SI_OWNER_SIBM);
+ memcpy(op->data.buf.in, src, op->data.nbytes);
+ ret = op->data.nbytes;
+ }
+ return ret;
}

+static const struct spi_controller_mem_ops dw_mchp_bootmaster_mem_ops = {
+ .exec_op = dw_mchp_bootmaster_exec_mem_op,
+};
+
static int dw_spi_mchp_init(struct platform_device *pdev,
struct dw_spi *dws,
struct dw_spi_mchp *dwsmchp,
@@ -107,6 +240,18 @@ static int dw_spi_mchp_init(struct platform_device *pdev,
}
}

+ /* See if we have a direct read window */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ if (res && resource_size(res) >= (SZ_16M*MAX_CS)) {
+ void __iomem *ptr = devm_ioremap_resource(&pdev->dev, res);
+
+ if (!IS_ERR(ptr)) {
+ dwsmchp->read_map = ptr;
+ dws->mem_ops = &dw_mchp_bootmaster_mem_ops;
+ dev_info(&pdev->dev, "Enabling fast memory operations\n");
+ }
+ }
+
dwsmchp->syscon =
syscon_regmap_lookup_by_compatible(props->syscon_name);
if (IS_ERR(dwsmchp->syscon)) {
@@ -119,10 +264,9 @@ static int dw_spi_mchp_init(struct platform_device *pdev,
if (dwsmchp->spi_mst)
writel(0, dwsmchp->spi_mst + MSCC_SPI_MST_SW_MODE);

- /* Select the owner of the SI interface */
- regmap_update_bits(dwsmchp->syscon, MSCC_CPU_SYSTEM_CTRL_GENERAL_CTRL,
- MSCC_IF_SI_OWNER_MASK << props->si_owner_bit,
- MSCC_IF_SI_OWNER_SIMC << props->si_owner_bit);
+ /* SPI2 mapping bitmask */
+ device_property_read_u32(&pdev->dev, "interface-mapping-mask",
+ &dwsmchp->if2mask);

dwsmchp->dws.set_cs = dw_spi_mchp_set_cs;

@@ -180,6 +324,27 @@ static int dw_spi_mchp_probe(struct platform_device *pdev)
dws->rx_sample_dly = DIV_ROUND_UP(rx_sample_dly,
(dws->max_freq / 1000000));

+ if (pdev->dev.of_node) {
+ int i;
+
+ for (i = 0; i < dws->num_cs; i++) {
+ int cs_gpio = of_get_named_gpio(pdev->dev.of_node,
+ "cs-gpios", i);
+
+ if (cs_gpio == -EPROBE_DEFER) {
+ ret = cs_gpio;
+ goto out;
+ }
+
+ if (gpio_is_valid(cs_gpio)) {
+ ret = devm_gpio_request(&pdev->dev, cs_gpio,
+ dev_name(&pdev->dev));
+ if (ret)
+ goto out;
+ }
+ }
+ }
+
props = device_get_match_data(&pdev->dev);
if (props)
ret = dw_spi_mchp_init(pdev, dws, dwsmchp, props);
@@ -213,6 +378,8 @@ static int dw_spi_mchp_remove(struct platform_device *pdev)
static const struct of_device_id dw_spi_mchp_of_match[] = {
{ .compatible = "mscc,ocelot-spi", .data = &dw_spi_mchp_props_ocelot},
{ .compatible = "mscc,jaguar2-spi", .data = &dw_spi_mchp_props_jaguar2},
+ { .compatible = "microchip,sparx5-spi",
+ .data = &dw_spi_mchp_props_sparx5},
{ /* end of table */}
};
MODULE_DEVICE_TABLE(of, dw_spi_mchp_of_match);
--
2.26.2