summaryrefslogtreecommitdiff
diff options
context:
space:
mode:
Diffstat
-rw-r--r--docs/platform/generic.md2
-rw-r--r--docs/platform/platform.md5
-rw-r--r--docs/platform/shakti_cclass.md33
-rw-r--r--include/sbi_utils/fdt/fdt_helper.h3
-rw-r--r--include/sbi_utils/serial/shakti-uart.h18
-rw-r--r--lib/utils/fdt/fdt_helper.c37
-rw-r--r--lib/utils/serial/fdt_serial.c2
-rw-r--r--lib/utils/serial/fdt_serial_shakti.c35
-rw-r--r--lib/utils/serial/objects.mk2
-rw-r--r--lib/utils/serial/shakti-uart.c44
10 files changed, 181 insertions, 0 deletions
diff --git a/docs/platform/generic.md b/docs/platform/generic.md
index 60916c7..f1f7f64 100644
--- a/docs/platform/generic.md
+++ b/docs/platform/generic.md
@@ -47,6 +47,8 @@ RISC-V Platforms Using Generic Platform
* **QEMU RISC-V Virt Machine** (*[qemu_virt.md]*)
* **Spike** (*[spike.md]*)
+* **Shakti C-class SoC Platform** (*[shakti_cclass.md]*)
[qemu_virt.md]: qemu_virt.md
[spike.md]: spike.md
+[shakti_cclass.md]: shakti_cclass.md
diff --git a/docs/platform/platform.md b/docs/platform/platform.md
index 3e0dc39..7f47068 100644
--- a/docs/platform/platform.md
+++ b/docs/platform/platform.md
@@ -38,6 +38,10 @@ OpenSBI currently supports the following virtual and hardware platforms:
on ariane core. More details on this platform can be found in the file
*[fpga_openpiton.md]*.
+* **Shakti C-class SoC Platform**: Platform support for Shakti C-class
+ processor based SOCs. More details on this platform can be found in the
+ file *[shakti_cclass.md]*.
+
The code for these supported platforms can be used as example to implement
support for other platforms. The *platform/template* directory also provides
template files for implementing support for a new platform. The *object.mk*,
@@ -52,3 +56,4 @@ facilitate the implementation.
[thead-c910.md]: thead-c910.md
[spike.md]: spike.md
[fpga_openpiton.md]: fpga_openpiton.md
+[shakti_cclass.md]: shakti_cclass.md
diff --git a/docs/platform/shakti_cclass.md b/docs/platform/shakti_cclass.md
new file mode 100644
index 0000000..2f4a699
--- /dev/null
+++ b/docs/platform/shakti_cclass.md
@@ -0,0 +1,33 @@
+Shakti C-class SoC Platform
+===========================
+C-Class is a member of the SHAKTI family of processors from
+Indian Institute of Technology - Madras (IIT-M).
+
+It is an extremely configurable and commercial-grade 5-stage
+in-order core supporting the standard RV64GCSUN ISA extensions.
+
+For more details, refer:
+* https://gitlab.com/shaktiproject/cores/c-class/blob/master/README.md
+* https://c-class.readthedocs.io/en/latest
+* https://shakti.org.in
+
+Platform Options
+----------------
+
+The *Shakti C-class SoC* platform does not have any platform-specific
+options.
+
+Building Shakti C-class Platform
+--------------------------------
+
+**Linux Kernel Payload**
+
+```
+make PLATFORM=generic FW_PAYLOAD_PATH=<linux_build_directory>/arch/riscv/boot/Image FW_PAYLOAD_FDT_PATH=<shakti.dtb path>
+```
+
+**Test Payload**
+
+```
+make PLATFORM=generic FW_PAYLOAD_FDT_PATH=<shakti.dtb path>
+```
diff --git a/include/sbi_utils/fdt/fdt_helper.h b/include/sbi_utils/fdt/fdt_helper.h
index 1b780fb..f5222de 100644
--- a/include/sbi_utils/fdt/fdt_helper.h
+++ b/include/sbi_utils/fdt/fdt_helper.h
@@ -39,6 +39,9 @@ int fdt_parse_hart_id(void *fdt, int cpu_offset, u32 *hartid);
int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid);
+int fdt_parse_shakti_uart_node(void *fdt, int nodeoffset,
+ struct platform_uart_data *uart);
+
int fdt_parse_sifive_uart_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart);
diff --git a/include/sbi_utils/serial/shakti-uart.h b/include/sbi_utils/serial/shakti-uart.h
new file mode 100644
index 0000000..08043be
--- /dev/null
+++ b/include/sbi_utils/serial/shakti-uart.h
@@ -0,0 +1,18 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Vijai Kumar K <vijai@behindbytes.com>
+ */
+
+#ifndef __SERIAL_SHAKTI_UART_H__
+#define __SERIAL_SHAKTI_UART_H__
+
+#include <sbi/sbi_types.h>
+
+void shakti_uart_putc(char ch);
+
+int shakti_uart_getc(void);
+
+int shakti_uart_init(unsigned long base, u32 in_freq, u32 baudrate);
+
+#endif
diff --git a/lib/utils/fdt/fdt_helper.c b/lib/utils/fdt/fdt_helper.c
index 887d6ed..78077f7 100644
--- a/lib/utils/fdt/fdt_helper.c
+++ b/lib/utils/fdt/fdt_helper.c
@@ -26,6 +26,9 @@
#define DEFAULT_SIFIVE_UART_REG_SHIFT 0
#define DEFAULT_SIFIVE_UART_REG_IO_WIDTH 4
+#define DEFAULT_SHAKTI_UART_FREQ 50000000
+#define DEFAULT_SHAKTI_UART_BAUD 115200
+
const struct fdt_match *fdt_match_node(void *fdt, int nodeoff,
const struct fdt_match *match_table)
{
@@ -164,6 +167,40 @@ int fdt_parse_max_hart_id(void *fdt, u32 *max_hartid)
return 0;
}
+int fdt_parse_shakti_uart_node(void *fdt, int nodeoffset,
+ struct platform_uart_data *uart)
+{
+ int len, rc;
+ const fdt32_t *val;
+ unsigned long reg_addr, reg_size;
+
+ if (nodeoffset < 0 || !uart || !fdt)
+ return SBI_ENODEV;
+
+ rc = fdt_get_node_addr_size(fdt, nodeoffset, &reg_addr, &reg_size);
+ if (rc < 0 || !reg_addr || !reg_size)
+ return SBI_ENODEV;
+ uart->addr = reg_addr;
+
+ /**
+ * UART address is mandaotry. clock-frequency and current-speed
+ * may not be present. Don't return error.
+ */
+ val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "clock-frequency", &len);
+ if (len > 0 && val)
+ uart->freq = fdt32_to_cpu(*val);
+ else
+ uart->freq = DEFAULT_SHAKTI_UART_FREQ;
+
+ val = (fdt32_t *)fdt_getprop(fdt, nodeoffset, "current-speed", &len);
+ if (len > 0 && val)
+ uart->baud = fdt32_to_cpu(*val);
+ else
+ uart->baud = DEFAULT_SHAKTI_UART_BAUD;
+
+ return 0;
+}
+
int fdt_parse_sifive_uart_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart)
{
diff --git a/lib/utils/serial/fdt_serial.c b/lib/utils/serial/fdt_serial.c
index fa6c478..b9ce67e 100644
--- a/lib/utils/serial/fdt_serial.c
+++ b/lib/utils/serial/fdt_serial.c
@@ -15,11 +15,13 @@
extern struct fdt_serial fdt_serial_uart8250;
extern struct fdt_serial fdt_serial_sifive;
extern struct fdt_serial fdt_serial_htif;
+extern struct fdt_serial fdt_serial_shakti;
static struct fdt_serial *serial_drivers[] = {
&fdt_serial_uart8250,
&fdt_serial_sifive,
&fdt_serial_htif,
+ &fdt_serial_shakti,
};
static void dummy_putc(char ch)
diff --git a/lib/utils/serial/fdt_serial_shakti.c b/lib/utils/serial/fdt_serial_shakti.c
new file mode 100644
index 0000000..c6385a5
--- /dev/null
+++ b/lib/utils/serial/fdt_serial_shakti.c
@@ -0,0 +1,35 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Vijai Kumar K <vijai@behindbytes.com>
+ *
+ */
+
+#include <sbi_utils/fdt/fdt_helper.h>
+#include <sbi_utils/serial/fdt_serial.h>
+#include <sbi_utils/serial/shakti-uart.h>
+
+static int serial_shakti_init(void *fdt, int nodeoff,
+ const struct fdt_match *match)
+{
+ int rc;
+ struct platform_uart_data uart;
+
+ rc = fdt_parse_shakti_uart_node(fdt, nodeoff, &uart);
+ if (rc)
+ return rc;
+
+ return shakti_uart_init(uart.addr, uart.freq, uart.baud);
+}
+
+static const struct fdt_match serial_shakti_match[] = {
+ { .compatible = "shakti,uart0" },
+ { },
+};
+
+struct fdt_serial fdt_serial_shakti = {
+ .match_table = serial_shakti_match,
+ .init = serial_shakti_init,
+ .getc = shakti_uart_getc,
+ .putc = shakti_uart_putc
+};
diff --git a/lib/utils/serial/objects.mk b/lib/utils/serial/objects.mk
index d81663b..c0746f0 100644
--- a/lib/utils/serial/objects.mk
+++ b/lib/utils/serial/objects.mk
@@ -9,7 +9,9 @@
libsbiutils-objs-y += serial/fdt_serial.o
libsbiutils-objs-y += serial/fdt_serial_htif.o
+libsbiutils-objs-y += serial/fdt_serial_shakti.o
libsbiutils-objs-y += serial/fdt_serial_sifive.o
libsbiutils-objs-y += serial/fdt_serial_uart8250.o
+libsbiutils-objs-y += serial/shakti-uart.o
libsbiutils-objs-y += serial/sifive-uart.o
libsbiutils-objs-y += serial/uart8250.o
diff --git a/lib/utils/serial/shakti-uart.c b/lib/utils/serial/shakti-uart.c
new file mode 100644
index 0000000..493edcf
--- /dev/null
+++ b/lib/utils/serial/shakti-uart.c
@@ -0,0 +1,44 @@
+/*
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2020 Vijai Kumar K <vijai@behindbytes.com>
+ */
+
+#include <sbi/riscv_io.h>
+#include <sbi/sbi_console.h>
+#include <sbi_utils/serial/shakti-uart.h>
+
+#define REG_BAUD 0x00
+#define REG_TX 0x04
+#define REG_RX 0x08
+#define REG_STATUS 0x0C
+#define REG_DELAY 0x10
+#define REG_CONTROL 0x14
+#define REG_INT_EN 0x18
+#define REG_IQ_CYCLES 0x1C
+#define REG_RX_THRES 0x20
+
+static volatile void *uart_base;
+
+void shakti_uart_putc(char ch)
+{
+ while((readw(uart_base + REG_STATUS) & 0x2) == 0);
+ writeb(ch, uart_base + REG_TX);
+}
+
+int shakti_uart_getc(void)
+{
+ u16 status = readw(uart_base + REG_STATUS);
+ if (status & 0x8)
+ return readb(uart_base + REG_RX);
+ return -1;
+}
+
+int shakti_uart_init(unsigned long base, u32 in_freq, u32 baudrate)
+{
+ uart_base = (volatile void *)base;
+ u16 baud = (u16)(in_freq/(16 * baudrate));
+ writew(baud, uart_base + REG_BAUD);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-16 18:20:36 +0300