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mmc: sdhci-msm: Factor out sdhci_msm_hc_select_mode 

This factors out sdhci_msm_hc_select_mode to later use
it during enhanced_strobe mode select.
It also further breaks sdhci_msm_hc_select_mode
into separate functions for configuring HS400 mode
or other modes.

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Tested-by: Jeremy McNicoll <jeremymc@redhat.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Ritesh Harjani 2017-01-10 12:30:45 +05:30 committed by Ulf Hansson
parent 73a85069f9
commit b54aaa8a4f
1 changed files with 114 additions and 87 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

201
drivers/mmc/host/sdhci-msm.c
View File

@ -464,6 +464,119 @@ static int msm_init_cm_dll(struct sdhci_host *host)
return 0;
}
static void msm_hc_select_default(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
u32 config;
if (!msm_host->use_cdclp533) {
config = readl_relaxed(host->ioaddr +
CORE_VENDOR_SPEC3);
config &= ~CORE_PWRSAVE_DLL;
writel_relaxed(config, host->ioaddr +
CORE_VENDOR_SPEC3);
}
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config &= ~CORE_HC_MCLK_SEL_MASK;
config |= CORE_HC_MCLK_SEL_DFLT;
writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
/*
* Disable HC_SELECT_IN to be able to use the UHS mode select
* configuration from Host Control2 register for all other
* modes.
* Write 0 to HC_SELECT_IN and HC_SELECT_IN_EN field
* in VENDOR_SPEC_FUNC
*/
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config &= ~CORE_HC_SELECT_IN_EN;
config &= ~CORE_HC_SELECT_IN_MASK;
writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
/*
* Make sure above writes impacting free running MCLK are completed
* before changing the clk_rate at GCC.
*/
wmb();
}
static void msm_hc_select_hs400(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
u32 config, dll_lock;
int rc;
/* Select the divided clock (free running MCLK/2) */
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config &= ~CORE_HC_MCLK_SEL_MASK;
config |= CORE_HC_MCLK_SEL_HS400;
writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
/*
* Select HS400 mode using the HC_SELECT_IN from VENDOR SPEC
* register
*/
if (msm_host->tuning_done && !msm_host->calibration_done) {
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config |= CORE_HC_SELECT_IN_HS400;
config |= CORE_HC_SELECT_IN_EN;
writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
}
if (!msm_host->clk_rate && !msm_host->use_cdclp533) {
/*
* Poll on DLL_LOCK or DDR_DLL_LOCK bits in
* CORE_DLL_STATUS to be set. This should get set
* within 15 us at 200 MHz.
*/
rc = readl_relaxed_poll_timeout(host->ioaddr +
CORE_DLL_STATUS,
dll_lock,
(dll_lock &
(CORE_DLL_LOCK |
CORE_DDR_DLL_LOCK)), 10,
1000);
if (rc == -ETIMEDOUT)
pr_err("%s: Unable to get DLL_LOCK/DDR_DLL_LOCK, dll_status: 0x%08x\n",
mmc_hostname(host->mmc), dll_lock);
}
/*
* Make sure above writes impacting free running MCLK are completed
* before changing the clk_rate at GCC.
*/
wmb();
}
/*
* sdhci_msm_hc_select_mode :- In general all timing modes are
* controlled via UHS mode select in Host Control2 register.
* eMMC specific HS200/HS400 doesn't have their respective modes
* defined here, hence we use these values.
*
* HS200 - SDR104 (Since they both are equivalent in functionality)
* HS400 - This involves multiple configurations
* Initially SDR104 - when tuning is required as HS200
* Then when switching to DDR @ 400MHz (HS400) we use
* the vendor specific HC_SELECT_IN to control the mode.
*
* In addition to controlling the modes we also need to select the
* correct input clock for DLL depending on the mode.
*
* HS400 - divided clock (free running MCLK/2)
* All other modes - default (free running MCLK)
*/
void sdhci_msm_hc_select_mode(struct sdhci_host *host)
{
struct mmc_ios ios = host->mmc->ios;
if (ios.timing == MMC_TIMING_MMC_HS400)
msm_hc_select_hs400(host);
else
msm_hc_select_default(host);
}
static int sdhci_msm_cdclp533_calibration(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
@ -894,7 +1007,6 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
struct mmc_ios curr_ios = host->mmc->ios;
u32 config, dll_lock;
int rc;
if (!clock) {
@ -913,93 +1025,8 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock)
curr_ios.timing == MMC_TIMING_MMC_DDR52 ||
curr_ios.timing == MMC_TIMING_MMC_HS400)
clock *= 2;
/*
* In general all timing modes are controlled via UHS mode select in
* Host Control2 register. eMMC specific HS200/HS400 doesn't have
* their respective modes defined here, hence we use these values.
*
* HS200 - SDR104 (Since they both are equivalent in functionality)
* HS400 - This involves multiple configurations
* Initially SDR104 - when tuning is required as HS200
* Then when switching to DDR @ 400MHz (HS400) we use
* the vendor specific HC_SELECT_IN to control the mode.
*
* In addition to controlling the modes we also need to select the
* correct input clock for DLL depending on the mode.
*
* HS400 - divided clock (free running MCLK/2)
* All other modes - default (free running MCLK)
*/
if (curr_ios.timing == MMC_TIMING_MMC_HS400) {
/* Select the divided clock (free running MCLK/2) */
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config &= ~CORE_HC_MCLK_SEL_MASK;
config |= CORE_HC_MCLK_SEL_HS400;
writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
/*
* Select HS400 mode using the HC_SELECT_IN from VENDOR SPEC
* register
*/
if (msm_host->tuning_done && !msm_host->calibration_done) {
/*
* Write 0x6 to HC_SELECT_IN and 1 to HC_SELECT_IN_EN
* field in VENDOR_SPEC_FUNC
*/
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config |= CORE_HC_SELECT_IN_HS400;
config |= CORE_HC_SELECT_IN_EN;
writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
}
if (!msm_host->clk_rate && !msm_host->use_cdclp533) {
/*
* Poll on DLL_LOCK or DDR_DLL_LOCK bits in
* CORE_DLL_STATUS to be set. This should get set
* within 15 us at 200 MHz.
*/
rc = readl_relaxed_poll_timeout(host->ioaddr +
CORE_DLL_STATUS,
dll_lock,
(dll_lock &
(CORE_DLL_LOCK |
CORE_DDR_DLL_LOCK)), 10,
1000);
if (rc == -ETIMEDOUT)
pr_err("%s: Unable to get DLL_LOCK/DDR_DLL_LOCK, dll_status: 0x%08x\n",
mmc_hostname(host->mmc), dll_lock);
}
} else {
if (!msm_host->use_cdclp533) {
config = readl_relaxed(host->ioaddr +
CORE_VENDOR_SPEC3);
config &= ~CORE_PWRSAVE_DLL;
writel_relaxed(config, host->ioaddr +
CORE_VENDOR_SPEC3);
}
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config &= ~CORE_HC_MCLK_SEL_MASK;
config |= CORE_HC_MCLK_SEL_DFLT;
writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
/*
* Disable HC_SELECT_IN to be able to use the UHS mode select
* configuration from Host Control2 register for all other
* modes.
* Write 0 to HC_SELECT_IN and HC_SELECT_IN_EN field
* in VENDOR_SPEC_FUNC
*/
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config &= ~CORE_HC_SELECT_IN_EN;
config &= ~CORE_HC_SELECT_IN_MASK;
writel_relaxed(config, host->ioaddr + CORE_VENDOR_SPEC);
}
/*
* Make sure above writes impacting free running MCLK are completed
* before changing the clk_rate at GCC.
*/
wmb();
sdhci_msm_hc_select_mode(host);
rc = clk_set_rate(msm_host->clk, clock);
if (rc) {