hw/ssi: Add a model of Xilinx Versal's OSPI flash memory controller

Add a model of Xilinx Versal's OSPI flash memory controller.

Signed-off-by: Francisco Iglesias <francisco.iglesias@xilinx.com>
Reviewed-by: Luc Michel <luc@lmichel.fr>
Message-id: 20220121161141.14389-7-francisco.iglesias@xilinx.com
[PMM: fixed indent]
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hw/ssi/meson.build

@@ -7,5 +7,6 @@ softmmu_ss.add(when: 'CONFIG_SSI', if_true: files('ssi.c'))
 softmmu_ss.add(when: 'CONFIG_STM32F2XX_SPI', if_true: files('stm32f2xx_spi.c'))
 softmmu_ss.add(when: 'CONFIG_XILINX_SPI', if_true: files('xilinx_spi.c'))
 softmmu_ss.add(when: 'CONFIG_XILINX_SPIPS', if_true: files('xilinx_spips.c'))
+softmmu_ss.add(when: 'CONFIG_XLNX_VERSAL', if_true: files('xlnx-versal-ospi.c'))
 softmmu_ss.add(when: 'CONFIG_IMX', if_true: files('imx_spi.c'))
 softmmu_ss.add(when: 'CONFIG_OMAP', if_true: files('omap_spi.c'))

include/hw/ssi/xlnx-versal-ospi.h

@@ -0,0 +1,111 @@
+/*
+ * Header file for the Xilinx Versal's OSPI controller
+ *
+ * Copyright (C) 2021 Xilinx Inc
+ * Written by Francisco Iglesias <francisco.iglesias@xilinx.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+/*
+ * This is a model of Xilinx Versal's Octal SPI flash memory controller
+ * documented in Versal's Technical Reference manual [1] and the Versal ACAP
+ * Register reference [2].
+ *
+ * References:
+ *
+ * [1] Versal ACAP Technical Reference Manual,
+ *     https://www.xilinx.com/support/documentation/architecture-manuals/am011-versal-acap-trm.pdf
+ *
+ * [2] Versal ACAP Register Reference,
+ *     https://www.xilinx.com/html_docs/registers/am012/am012-versal-register-reference.html#mod___ospi.html
+ *
+ *
+ * QEMU interface:
+ * + sysbus MMIO region 0: MemoryRegion for the device's registers
+ * + sysbus MMIO region 1: MemoryRegion for flash memory linear address space
+ *   (data transfer).
+ * + sysbus IRQ 0: Device interrupt.
+ * + Named GPIO input "ospi-mux-sel": 0: enables indirect access mode
+ *   and 1: enables direct access mode.
+ * + Property "dac-with-indac": Allow both direct accesses and indirect
+ *   accesses simultaneously.
+ * + Property "indac-write-disabled": Disable indirect access writes.
+ */
+
+#ifndef XILINX_VERSAL_OSPI_H
+#define XILINX_VERSAL_OSPI_H
+
+#include "hw/register.h"
+#include "hw/ssi/ssi.h"
+#include "qemu/fifo8.h"
+#include "hw/dma/xlnx_csu_dma.h"
+
+#define TYPE_XILINX_VERSAL_OSPI "xlnx.versal-ospi"
+
+OBJECT_DECLARE_SIMPLE_TYPE(XlnxVersalOspi, XILINX_VERSAL_OSPI)
+
+#define XILINX_VERSAL_OSPI_R_MAX (0xfc / 4 + 1)
+
+/*
+ * Indirect operations
+ */
+typedef struct IndOp {
+    uint32_t flash_addr;
+    uint32_t num_bytes;
+    uint32_t done_bytes;
+    bool completed;
+} IndOp;
+
+struct XlnxVersalOspi {
+    SysBusDevice parent_obj;
+
+    MemoryRegion iomem;
+    MemoryRegion iomem_dac;
+
+    uint8_t num_cs;
+    qemu_irq *cs_lines;
+
+    SSIBus *spi;
+
+    Fifo8 rx_fifo;
+    Fifo8 tx_fifo;
+
+    Fifo8 rx_sram;
+    Fifo8 tx_sram;
+
+    qemu_irq irq;
+
+    XlnxCSUDMA *dma_src;
+    bool ind_write_disabled;
+    bool dac_with_indac;
+    bool dac_enable;
+    bool src_dma_inprog;
+
+    IndOp rd_ind_op[2];
+    IndOp wr_ind_op[2];
+
+    uint32_t regs[XILINX_VERSAL_OSPI_R_MAX];
+    RegisterInfo regs_info[XILINX_VERSAL_OSPI_R_MAX];
+
+    /* Maximum inferred membank size is 512 bytes */
+    uint8_t stig_membank[512];
+};
+
+#endif /* XILINX_VERSAL_OSPI_H */