spi: cadence: Add static PHY configuration in Marvell overlay

This commit adds support for static PHY configuration of Cadence xSPI
block. Configuration will be applied only if Marvell overlay compatible
string will be detected. Configuration is static over the whole
frequency range.

Signed-off-by: Witold Sadowski <wsadowski@marvell.com>
Link: https://patch.msgid.link/20240724154739.582367-3-wsadowski@marvell.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-cadence-xspi.c b/drivers/spi/spi-cadence-xspi.c
index 2e3eacd46b7232e91508453594accb2bb912ab96..70b1b4a0ff139979744af0aeae5bd1dbb730ece2 100644 (file)
--- a/drivers/spi/spi-cadence-xspi.c
+++ b/drivers/spi/spi-cadence-xspi.c
@@ -193,6 +193,30 @@
                ((op)->data.dir == SPI_MEM_DATA_IN) ? \
                CDNS_XSPI_STIG_CMD_DIR_READ : CDNS_XSPI_STIG_CMD_DIR_WRITE))
 
+/* Marvell PHY default values */
+#define MARVELL_REGS_DLL_PHY_CTRL              0x00000707
+#define MARVELL_CTB_RFILE_PHY_CTRL             0x00004000
+#define MARVELL_RFILE_PHY_TSEL                 0x00000000
+#define MARVELL_RFILE_PHY_DQ_TIMING            0x00000101
+#define MARVELL_RFILE_PHY_DQS_TIMING           0x00700404
+#define MARVELL_RFILE_PHY_GATE_LPBK_CTRL       0x00200030
+#define MARVELL_RFILE_PHY_DLL_MASTER_CTRL      0x00800000
+#define MARVELL_RFILE_PHY_DLL_SLAVE_CTRL       0x0000ff01
+
+/* PHY config registers */
+#define CDNS_XSPI_RF_MINICTRL_REGS_DLL_PHY_CTRL                        0x1034
+#define CDNS_XSPI_PHY_CTB_RFILE_PHY_CTRL                       0x0080
+#define CDNS_XSPI_PHY_CTB_RFILE_PHY_TSEL                       0x0084
+#define CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_DQ_TIMING            0x0000
+#define CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_DQS_TIMING           0x0004
+#define CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_GATE_LPBK_CTRL       0x0008
+#define CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_DLL_MASTER_CTRL      0x000c
+#define CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_DLL_SLAVE_CTRL       0x0010
+#define CDNS_XSPI_DATASLICE_RFILE_PHY_DLL_OBS_REG_0            0x001c
+
+#define CDNS_XSPI_DLL_RST_N BIT(24)
+#define CDNS_XSPI_DLL_LOCK  BIT(0)
+
 enum cdns_xspi_stig_instr_type {
        CDNS_XSPI_STIG_INSTR_TYPE_0,
        CDNS_XSPI_STIG_INSTR_TYPE_1,
@@ -209,6 +233,34 @@ enum cdns_xspi_stig_cmd_dir {
        CDNS_XSPI_STIG_CMD_DIR_WRITE,
 };
 
+struct cdns_xspi_driver_data {
+       bool mrvl_hw_overlay;
+       u32 dll_phy_ctrl;
+       u32 ctb_rfile_phy_ctrl;
+       u32 rfile_phy_tsel;
+       u32 rfile_phy_dq_timing;
+       u32 rfile_phy_dqs_timing;
+       u32 rfile_phy_gate_lpbk_ctrl;
+       u32 rfile_phy_dll_master_ctrl;
+       u32 rfile_phy_dll_slave_ctrl;
+};
+
+static struct cdns_xspi_driver_data marvell_driver_data = {
+       .mrvl_hw_overlay = true,
+       .dll_phy_ctrl = MARVELL_REGS_DLL_PHY_CTRL,
+       .ctb_rfile_phy_ctrl = MARVELL_CTB_RFILE_PHY_CTRL,
+       .rfile_phy_tsel = MARVELL_RFILE_PHY_TSEL,
+       .rfile_phy_dq_timing = MARVELL_RFILE_PHY_DQ_TIMING,
+       .rfile_phy_dqs_timing = MARVELL_RFILE_PHY_DQS_TIMING,
+       .rfile_phy_gate_lpbk_ctrl = MARVELL_RFILE_PHY_GATE_LPBK_CTRL,
+       .rfile_phy_dll_master_ctrl = MARVELL_RFILE_PHY_DLL_MASTER_CTRL,
+       .rfile_phy_dll_slave_ctrl = MARVELL_RFILE_PHY_DLL_SLAVE_CTRL,
+};
+
+static struct cdns_xspi_driver_data cdns_driver_data = {
+       .mrvl_hw_overlay = false,
+};
+
 struct cdns_xspi_dev {
        struct platform_device *pdev;
        struct device *dev;
@@ -230,8 +282,55 @@ struct cdns_xspi_dev {
        const void *out_buffer;
 
        u8 hw_num_banks;
+
+       const struct cdns_xspi_driver_data *driver_data;
 };
 
+static void cdns_xspi_reset_dll(struct cdns_xspi_dev *cdns_xspi)
+{
+       u32 dll_cntrl = readl(cdns_xspi->iobase +
+                             CDNS_XSPI_RF_MINICTRL_REGS_DLL_PHY_CTRL);
+
+       /* Reset DLL */
+       dll_cntrl |= CDNS_XSPI_DLL_RST_N;
+       writel(dll_cntrl, cdns_xspi->iobase +
+                         CDNS_XSPI_RF_MINICTRL_REGS_DLL_PHY_CTRL);
+}
+
+static bool cdns_xspi_is_dll_locked(struct cdns_xspi_dev *cdns_xspi)
+{
+       u32 dll_lock;
+
+       return !readl_relaxed_poll_timeout(cdns_xspi->iobase +
+               CDNS_XSPI_INTR_STATUS_REG,
+               dll_lock, ((dll_lock & CDNS_XSPI_DLL_LOCK) == 1), 10, 10000);
+}
+
+/* Static configuration of PHY */
+static bool cdns_xspi_configure_phy(struct cdns_xspi_dev *cdns_xspi)
+{
+       writel(cdns_xspi->driver_data->dll_phy_ctrl,
+              cdns_xspi->iobase + CDNS_XSPI_RF_MINICTRL_REGS_DLL_PHY_CTRL);
+       writel(cdns_xspi->driver_data->ctb_rfile_phy_ctrl,
+              cdns_xspi->auxbase + CDNS_XSPI_PHY_CTB_RFILE_PHY_CTRL);
+       writel(cdns_xspi->driver_data->rfile_phy_tsel,
+              cdns_xspi->auxbase + CDNS_XSPI_PHY_CTB_RFILE_PHY_TSEL);
+       writel(cdns_xspi->driver_data->rfile_phy_dq_timing,
+              cdns_xspi->auxbase + CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_DQ_TIMING);
+       writel(cdns_xspi->driver_data->rfile_phy_dqs_timing,
+              cdns_xspi->auxbase + CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_DQS_TIMING);
+       writel(cdns_xspi->driver_data->rfile_phy_gate_lpbk_ctrl,
+              cdns_xspi->auxbase + CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_GATE_LPBK_CTRL);
+       writel(cdns_xspi->driver_data->rfile_phy_dll_master_ctrl,
+              cdns_xspi->auxbase + CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_DLL_MASTER_CTRL);
+       writel(cdns_xspi->driver_data->rfile_phy_dll_slave_ctrl,
+              cdns_xspi->auxbase + CDNS_XSPI_PHY_DATASLICE_RFILE_PHY_DLL_SLAVE_CTRL);
+
+       cdns_xspi_reset_dll(cdns_xspi);
+
+       return cdns_xspi_is_dll_locked(cdns_xspi);
+}
+
 static int cdns_xspi_wait_for_controller_idle(struct cdns_xspi_dev *cdns_xspi)
 {
        u32 ctrl_stat;
@@ -544,13 +643,17 @@ static int cdns_xspi_probe(struct platform_device *pdev)
                SPI_RX_DUAL | SPI_RX_QUAD | SPI_TX_OCTAL | SPI_RX_OCTAL |
                SPI_MODE_0  | SPI_MODE_3;
 
+       cdns_xspi = spi_controller_get_devdata(host);
+       cdns_xspi->driver_data = of_device_get_match_data(dev);
+       if (!cdns_xspi->driver_data)
+               return -ENODEV;
+
        host->mem_ops = &cadence_xspi_mem_ops;
        host->dev.of_node = pdev->dev.of_node;
        host->bus_num = -1;
 
        platform_set_drvdata(pdev, host);
 
-       cdns_xspi = spi_controller_get_devdata(host);
        cdns_xspi->pdev = pdev;
        cdns_xspi->dev = &pdev->dev;
        cdns_xspi->cur_cs = 0;
@@ -592,6 +695,9 @@ static int cdns_xspi_probe(struct platform_device *pdev)
                return ret;
        }
 
+       if (cdns_xspi->driver_data->mrvl_hw_overlay)
+               cdns_xspi_configure_phy(cdns_xspi);
+
        cdns_xspi_print_phy_config(cdns_xspi);
 
        ret = cdns_xspi_controller_init(cdns_xspi);
@@ -616,6 +722,11 @@ static int cdns_xspi_probe(struct platform_device *pdev)
 static const struct of_device_id cdns_xspi_of_match[] = {
        {
                .compatible = "cdns,xspi-nor",
+               .data = &cdns_driver_data,
+       },
+       {
+               .compatible = "marvell,cn10-xspi-nor",
+               .data = &marvell_driver_data,
        },
        { /* end of table */}
 };