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mmc: mediatek: Add subsys clock control for MT8192 msdc

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MT8192 msdc is an independent sub system, we need control more bus
clocks for it.
Add support for the additional subsys clocks to allow it to be
configured appropriately.

Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Link: https://lore.kernel.org/r/20201014030846.12428-5-wenbin.mei@mediatek.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Wenbin Mei 2020-10-14 11:08:46 +08:00 committed by Ulf Hansson
parent 59a23395d8
commit f5eccd94b6
1 changed files with 56 additions and 18 deletions
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74
drivers/mmc/host/mtk-sd.c
View File

@ -35,6 +35,7 @@
#include "cqhci.h"
#define MAX_BD_NUM 1024
#define MSDC_NR_CLOCKS 3
/*--------------------------------------------------------------------------*/
/* Common Definition */
@ -425,6 +426,8 @@ struct msdc_host {
struct clk *h_clk; /* msdc h_clk */
struct clk *bus_clk; /* bus clock which used to access register */
struct clk *src_clk_cg; /* msdc source clock control gate */
struct clk *sys_clk_cg; /* msdc subsys clock control gate */
struct clk_bulk_data bulk_clks[MSDC_NR_CLOCKS];
u32 mclk; /* mmc subsystem clock frequency */
u32 src_clk_freq; /* source clock frequency */
unsigned char timing;
@ -784,6 +787,7 @@ static void msdc_set_busy_timeout(struct msdc_host *host, u64 ns, u64 clks)
static void msdc_gate_clock(struct msdc_host *host)
{
clk_bulk_disable_unprepare(MSDC_NR_CLOCKS, host->bulk_clks);
clk_disable_unprepare(host->src_clk_cg);
clk_disable_unprepare(host->src_clk);
clk_disable_unprepare(host->bus_clk);
@ -792,10 +796,18 @@ static void msdc_gate_clock(struct msdc_host *host)
static void msdc_ungate_clock(struct msdc_host *host)
{
int ret;
clk_prepare_enable(host->h_clk);
clk_prepare_enable(host->bus_clk);
clk_prepare_enable(host->src_clk);
clk_prepare_enable(host->src_clk_cg);
ret = clk_bulk_prepare_enable(MSDC_NR_CLOCKS, host->bulk_clks);
if (ret) {
dev_err(host->dev, "Cannot enable pclk/axi/ahb clock gates\n");
return;
}
while (!(readl(host->base + MSDC_CFG) & MSDC_CFG_CKSTB))
cpu_relax();
}
@ -2366,6 +2378,48 @@ static void msdc_of_property_parse(struct platform_device *pdev,
host->cqhci = false;
}
static int msdc_of_clock_parse(struct platform_device *pdev,
struct msdc_host *host)
{
int ret;
host->src_clk = devm_clk_get(&pdev->dev, "source");
if (IS_ERR(host->src_clk))
return PTR_ERR(host->src_clk);
host->h_clk = devm_clk_get(&pdev->dev, "hclk");
if (IS_ERR(host->h_clk))
return PTR_ERR(host->h_clk);
host->bus_clk = devm_clk_get_optional(&pdev->dev, "bus_clk");
if (IS_ERR(host->bus_clk))
host->bus_clk = NULL;
/*source clock control gate is optional clock*/
host->src_clk_cg = devm_clk_get_optional(&pdev->dev, "source_cg");
if (IS_ERR(host->src_clk_cg))
host->src_clk_cg = NULL;
host->sys_clk_cg = devm_clk_get_optional(&pdev->dev, "sys_cg");
if (IS_ERR(host->sys_clk_cg))
host->sys_clk_cg = NULL;
/* If present, always enable for this clock gate */
clk_prepare_enable(host->sys_clk_cg);
host->bulk_clks[0].id = "pclk_cg";
host->bulk_clks[1].id = "axi_cg";
host->bulk_clks[2].id = "ahb_cg";
ret = devm_clk_bulk_get_optional(&pdev->dev, MSDC_NR_CLOCKS,
host->bulk_clks);
if (ret) {
dev_err(&pdev->dev, "Cannot get pclk/axi/ahb clock gates\n");
return ret;
}
return 0;
}
static int msdc_drv_probe(struct platform_device *pdev)
{
struct mmc_host *mmc;
@ -2405,25 +2459,9 @@ static int msdc_drv_probe(struct platform_device *pdev)
if (ret)
goto host_free;
host->src_clk = devm_clk_get(&pdev->dev, "source");
if (IS_ERR(host->src_clk)) {
ret = PTR_ERR(host->src_clk);
ret = msdc_of_clock_parse(pdev, host);
if (ret)
goto host_free;
}
host->h_clk = devm_clk_get(&pdev->dev, "hclk");
if (IS_ERR(host->h_clk)) {
ret = PTR_ERR(host->h_clk);
goto host_free;
}
host->bus_clk = devm_clk_get(&pdev->dev, "bus_clk");
if (IS_ERR(host->bus_clk))
host->bus_clk = NULL;
/*source clock control gate is optional clock*/
host->src_clk_cg = devm_clk_get(&pdev->dev, "source_cg");
if (IS_ERR(host->src_clk_cg))
host->src_clk_cg = NULL;
host->reset = devm_reset_control_get_optional_exclusive(&pdev->dev,
"hrst");