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ipq807x: Added the baud rates support

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Change-Id: I099488e7a0a74669b974c6892022922c3f14610a
Signed-off-by: Sham Muthayyan <smuthayy@codeaurora.org>
This commit is contained in:
Sham Muthayyan 2017-07-04 17:44:34 +05:30 • committed by Gerrit - the friendly Code Review server
parent 7195fa74b2
commit 9841ffefc8
2 changed files with 91 additions and 0 deletions
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1
arch/arm/include/asm/arch-qca-common/uart.h
View file

@ -84,6 +84,7 @@ struct ipq_serial_platdata {
unsigned long reg_base; /* address of registers in physical memory */
u8 port_id; /* uart port number */
u8 bit_rate;
unsigned int clk_rate;
int m_value;
int n_value;
int d_value;

90
drivers/serial/qca_uart.c
View file

@ -58,6 +58,7 @@ static int uart_valid_data = 0;
/* Received data */
static unsigned int word = 0;
static unsigned int uart_word = 0;
static unsigned int current_baud_rate = 0;
/**
* msm_boot_uart_dm_init_rx_transfer - Init Rx transfer
@ -536,18 +537,87 @@ static void do_uart_start(void)
uart2.port_id = fdtdec_get_int(gd->fdt_blob, node, "id", -1);
uart2.bit_rate = fdtdec_get_int(gd->fdt_blob, node,
"bit_rate", -1);
uart2.clk_rate = fdtdec_get_int(gd->fdt_blob, node,
"clk_rate", -1);
uart2.m_value = fdtdec_get_int(gd->fdt_blob, node, "m_value", -1);
uart2.n_value = fdtdec_get_int(gd->fdt_blob, node, "n_value", -1);
uart2.d_value = fdtdec_get_int(gd->fdt_blob, node, "d_value", -1);
ipq_serial_init(&uart2, uart2.reg_base);
}
static const baud_table[] = {
150, 300, 600, 1200, 2400, 4800, 9600, 14400, 19200, 38400, 57600, 115200
};
static int find_baud_rate(unsigned int baud_rate)
{
int i;
for (i=0; i<ARRAY_SIZE(baud_table); i++)
{
if(baud_rate == baud_table[i])
return 1;
}
return 0;
}
struct msm_baud_map {
u16 divisor;
u8 code;
};
static void set_baud_rate(unsigned int baud)
{
unsigned int divisor;
const struct msm_baud_map *entry, *end;
static const struct msm_baud_map table[] = {
{ 1, 0xff },
{ 2, 0xee },
{ 3, 0xdd },
{ 4, 0xcc },
{ 6, 0xbb },
{ 8, 0xaa },
{ 12, 0x99 },
{ 16, 0x88 },
{ 24, 0x77 },
{ 32, 0x66 },
{ 48, 0x55 },
{ 96, 0x44 },
{ 192, 0x33 },
{ 384, 0x22 },
{ 768, 0x11 },
{ 1536, 0x00 },
};
if (uart2.clk_rate == 0)
{
printf("Second uart is not initialised\n");
return;
}
divisor = uart2.clk_rate / baud / 16;
end = table + ARRAY_SIZE(table);
entry = table;
while (entry < end) {
if (entry->divisor == divisor) {
writel(entry->code, MSM_BOOT_UART_DM_CSR(uart2.reg_base));
current_baud_rate = baud;
break;
}
entry++;
}
}
/******************************************************************************
* uart command intepreter
*/
static int do_uart(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
{
int i;
unsigned int baud_rate;
if (argc < 2)
return CMD_RET_USAGE;
@ -571,6 +641,25 @@ static int do_uart(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return 0;
}
}
if (strcmp(argv[1], "baud_rate") == 0) {
if (argc == 3) {
baud_rate = simple_strtoul(argv[2], NULL, 10);
if (!find_baud_rate(baud_rate)) {
printf("Invalid baud rate %d\n", baud_rate);
printf("The supported rates are:");
for (i=0; i<ARRAY_SIZE(baud_table); i++)
printf("%d ", baud_table[i]);
return -1;
}
set_baud_rate(baud_rate);
} else {
printf("The current baud rate is: %d\n", current_baud_rate);
}
return 0;
}
return CMD_RET_USAGE;
}
U_BOOT_CMD(
@ -579,4 +668,5 @@ U_BOOT_CMD(
"start - start UART controller\n"
"uart read - read strings from second UART\n"
"uart write - write strings to second UART\n"
"uart baud_rate [rate] - show or set second UART baud rates\n"
);