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>
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@ -178,6 +178,18 @@ static unsigned int rtl8411_cd_deglitch(struct rtsx_pcr *pcr)
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return card_exist;
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}
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static int rtl8411_conv_clk_and_div_n(int input, int dir)
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{
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int output;
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if (dir == CLK_TO_DIV_N)
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output = input * 4 / 5 - 2;
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else
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output = (input + 2) * 5 / 4;
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return output;
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}
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static const struct pcr_ops rtl8411_pcr_ops = {
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.extra_init_hw = rtl8411_extra_init_hw,
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.optimize_phy = NULL,
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@ -189,6 +201,7 @@ static const struct pcr_ops rtl8411_pcr_ops = {
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.card_power_off = rtl8411_card_power_off,
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.switch_output_voltage = rtl8411_switch_output_voltage,
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.cd_deglitch = rtl8411_cd_deglitch,
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.conv_clk_and_div_n = rtl8411_conv_clk_and_div_n,
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};
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/* SD Pull Control Enable:
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@ -174,6 +174,7 @@ static const struct pcr_ops rts5209_pcr_ops = {
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.card_power_off = rts5209_card_power_off,
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.switch_output_voltage = rts5209_switch_output_voltage,
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.cd_deglitch = NULL,
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.conv_clk_and_div_n = NULL,
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};
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/* SD Pull Control Enable:
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@ -144,6 +144,7 @@ static const struct pcr_ops rts5229_pcr_ops = {
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.card_power_off = rts5229_card_power_off,
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.switch_output_voltage = rts5229_switch_output_voltage,
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.cd_deglitch = NULL,
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.conv_clk_and_div_n = NULL,
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};
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/* SD Pull Control Enable:
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@ -630,6 +630,9 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock,
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if (clk == pcr->cur_clock)
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return 0;
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if (pcr->ops->conv_clk_and_div_n)
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N = (u8)pcr->ops->conv_clk_and_div_n(clk, CLK_TO_DIV_N);
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else
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N = (u8)(clk - 2);
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if ((clk <= 2) || (N > max_N))
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return -EINVAL;
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@ -641,7 +644,14 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock,
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/* Make sure that the SSC clock div_n is equal or greater than min_N */
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div = CLK_DIV_1;
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while ((N < min_N) && (div < max_div)) {
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if (pcr->ops->conv_clk_and_div_n) {
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int dbl_clk = pcr->ops->conv_clk_and_div_n(N,
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DIV_N_TO_CLK) * 2;
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N = (u8)pcr->ops->conv_clk_and_div_n(dbl_clk,
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CLK_TO_DIV_N);
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} else {
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N = (N + 2) * 2 - 2;
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}
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div++;
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}
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dev_dbg(&(pcr->pci->dev), "N = %d, div = %d\n", N, div);
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@ -38,6 +38,9 @@
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#define RTSX_SD_CARD 0
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#define RTSX_MS_CARD 1
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#define CLK_TO_DIV_N 0
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#define DIV_N_TO_CLK 1
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struct platform_device;
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struct rtsx_slot {
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@ -704,6 +704,7 @@ struct pcr_ops {
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int (*switch_output_voltage)(struct rtsx_pcr *pcr,
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u8 voltage);
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unsigned int (*cd_deglitch)(struct rtsx_pcr *pcr);
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int (*conv_clk_and_div_n)(int clk, int dir);
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};
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enum PDEV_STAT {PDEV_STAT_IDLE, PDEV_STAT_RUN};
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