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mfd: rtsx: Add clock divider hook 

Add callback function conv_clk_and_div_n to convert between SSC clock
and its divider N.
For rtl8411, the formula to calculate SSC clock divider N is different
with the other card reader models.

Signed-off-by: Wei WANG <wei_wang@realsil.com.cn>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Wei WANG 2013-01-23 09:51:06 +08:00 committed by Samuel Ortiz
parent ef85e736b1
commit ab4e8f8b7b
6 changed files with 31 additions and 2 deletions
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13
drivers/mfd/rtl8411.c
View File

@ -178,6 +178,18 @@ static unsigned int rtl8411_cd_deglitch(struct rtsx_pcr *pcr)
return card_exist;
}
static int rtl8411_conv_clk_and_div_n(int input, int dir)
{
int output;
if (dir == CLK_TO_DIV_N)
output = input * 4 / 5 - 2;
else
output = (input + 2) * 5 / 4;
return output;
}
static const struct pcr_ops rtl8411_pcr_ops = {
.extra_init_hw = rtl8411_extra_init_hw,
.optimize_phy = NULL,
@ -189,6 +201,7 @@ static const struct pcr_ops rtl8411_pcr_ops = {
.card_power_off = rtl8411_card_power_off,
.switch_output_voltage = rtl8411_switch_output_voltage,
.cd_deglitch = rtl8411_cd_deglitch,
.conv_clk_and_div_n = rtl8411_conv_clk_and_div_n,
};
/* SD Pull Control Enable:

1
drivers/mfd/rts5209.c
View File

@ -174,6 +174,7 @@ static const struct pcr_ops rts5209_pcr_ops = {
.card_power_off = rts5209_card_power_off,
.switch_output_voltage = rts5209_switch_output_voltage,
.cd_deglitch = NULL,
.conv_clk_and_div_n = NULL,
};
/* SD Pull Control Enable:

1
drivers/mfd/rts5229.c
View File

@ -144,6 +144,7 @@ static const struct pcr_ops rts5229_pcr_ops = {
.card_power_off = rts5229_card_power_off,
.switch_output_voltage = rts5229_switch_output_voltage,
.cd_deglitch = NULL,
.conv_clk_and_div_n = NULL,
};
/* SD Pull Control Enable:

14
drivers/mfd/rtsx_pcr.c
View File

@ -630,7 +630,10 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock,
if (clk == pcr->cur_clock)
return 0;
N = (u8)(clk - 2);
if (pcr->ops->conv_clk_and_div_n)
N = (u8)pcr->ops->conv_clk_and_div_n(clk, CLK_TO_DIV_N);
else
N = (u8)(clk - 2);
if ((clk <= 2) || (N > max_N))
return -EINVAL;
@ -641,7 +644,14 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock,
/* Make sure that the SSC clock div_n is equal or greater than min_N */
div = CLK_DIV_1;
while ((N < min_N) && (div < max_div)) {
N = (N + 2) * 2 - 2;
if (pcr->ops->conv_clk_and_div_n) {
int dbl_clk = pcr->ops->conv_clk_and_div_n(N,
DIV_N_TO_CLK) * 2;
N = (u8)pcr->ops->conv_clk_and_div_n(dbl_clk,
CLK_TO_DIV_N);
} else {
N = (N + 2) * 2 - 2;
}
div++;
}
dev_dbg(&(pcr->pci->dev), "N = %d, div = %d\n", N, div);

3
include/linux/mfd/rtsx_common.h
View File

@ -38,6 +38,9 @@
#define RTSX_SD_CARD 0
#define RTSX_MS_CARD 1
#define CLK_TO_DIV_N 0
#define DIV_N_TO_CLK 1
struct platform_device;
struct rtsx_slot {

1
include/linux/mfd/rtsx_pci.h
View File

@ -704,6 +704,7 @@ struct pcr_ops {
int (*switch_output_voltage)(struct rtsx_pcr *pcr,
u8 voltage);
unsigned int (*cd_deglitch)(struct rtsx_pcr *pcr);
int (*conv_clk_and_div_n)(int clk, int dir);
};
enum PDEV_STAT {PDEV_STAT_IDLE, PDEV_STAT_RUN};