Mirrors/opensbi
1
0
Fork 1
mirror of https://github.com/riscv-software-src/opensbi.git synced 2025-08-24 15:31:22 +01:00
Code Issues Packages Projects Releases Wiki Activity

lib: utils: Add fdt_parse_sifive_uart_node() function

Browse Source 
We add fdt_parse_sifive_uart_node() function which will allow
us to parse a particular DT node as SiFive UART node. This will
be useful in parsing the node pointed by stdout-path.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Atish Patra <atish.patra@wdc.com>
This commit is contained in:
Anup Patel
2020-04-25 18:50:37 +05:30
committed by Anup Patel
parent dd33b9e0a1
commit 66185b3ec9
2 changed files with 46 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/sbi_utils/fdt/fdt_helper.h
View File

@@ -37,6 +37,9 @@ int fdt_find_match(void *fdt, const struct fdt_match *match_table,
int fdt_get_node_addr_size(void *fdt, int node, unsigned long *addr,
unsigned long *size);
int fdt_parse_sifive_uart_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart);
int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart);

43
lib/utils/fdt/fdt_helper.c
View File

@@ -18,6 +18,11 @@
#define DEFAULT_UART_REG_SHIFT 0
#define DEFAULT_UART_REG_IO_WIDTH 1
#define DEFAULT_SIFIVE_UART_FREQ 0
#define DEFAULT_SIFIVE_UART_BAUD 115200
#define DEFAULT_SIFIVE_UART_REG_SHIFT 0
#define DEFAULT_SIFIVE_UART_REG_IO_WIDTH 4
const struct fdt_match *fdt_match_node(void *fdt, int nodeoff,
const struct fdt_match *match_table)
{
@@ -99,6 +104,44 @@ int fdt_get_node_addr_size(void *fdt, int node, unsigned long *addr,
return 0;
}
int fdt_parse_sifive_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_SIFIVE_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_SIFIVE_UART_BAUD;
/* For SiFive UART, the reg-shift and reg-io-width are fixed .*/
uart->reg_shift = DEFAULT_SIFIVE_UART_REG_SHIFT;
uart->reg_io_width = DEFAULT_SIFIVE_UART_REG_IO_WIDTH;
return 0;
}
int fdt_parse_uart8250_node(void *fdt, int nodeoffset,
struct platform_uart_data *uart)
{