MFD,mmc: tmio_mmc: make HCLK configurable

The Toshiba parts all have a 24 MHz HCLK, but HTC ASIC3 has a 24.576 MHz HCLK
and AMD Imageon w228x's HCLK is 80 MHz. With this patch, the MFD driver
provides the HCLK frequency to tmio_mmc via mfd_cell->driver_data.

Signed-off-by: Philipp Zabel <philipp.zabel@gmail.com>
Acked-by: Ian Molton <ian@mnementh.co.uk>
Acked-by: Samuel Ortiz <sameo@openedhand.com>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>

1 files changed, 11 insertions, 13 deletions

diff --git a/drivers/mmc/host/tmio_mmc.c b/drivers/mmc/host/tmio_mmc.c
index 63fbd5b7d312..49df71e6be17 100644
--- a/drivers/mmc/host/tmio_mmc.c
+++ b/drivers/mmc/host/tmio_mmc.c
@@ -35,23 +35,14 @@
 
 #include "tmio_mmc.h"
 
-/*
- * Fixme - documentation conflicts on what the clock values are for the
- * various dividers.
- * One document I have says that its a divisor of a 24MHz clock, another 33.
- * This probably depends on HCLK for a given platform, so we may need to
- * require HCLK be passed to us from the MFD core.
- *
- */
-
 static void tmio_mmc_set_clock(struct tmio_mmc_host *host, int new_clock)
 {
         void __iomem *cnf = host->cnf;
         void __iomem *ctl = host->ctl;
-        u32 clk = 0, clock;
+        u32 clk = 0, clock, f_min = host->mmc->f_min;
 
         if (new_clock) {
-                for (clock = 46875, clk = 0x100; new_clock >= (clock<<1); ) {
+                for (clock = f_min, clk = 0x100; new_clock >= (clock<<1); ) {
                         clock <<= 1;
                         clk >>= 1;
                 }
@@ -545,6 +536,7 @@ out:
 static int __devinit tmio_mmc_probe(struct platform_device *dev)
 {
         struct mfd_cell *cell = (struct mfd_cell *)dev->dev.platform_data;
+        struct tmio_mmc_data *pdata;
         struct resource *res_ctl, *res_cnf;
         struct tmio_mmc_host *host;
         struct mmc_host *mmc;
@@ -560,6 +552,12 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
                 goto out;
         }
 
+        pdata = cell->driver_data;
+        if (!pdata || !pdata->hclk) {
+                ret = -EINVAL;
+                goto out;
+        }
+
         mmc = mmc_alloc_host(sizeof(struct tmio_mmc_host), &dev->dev);
         if (!mmc)
                 goto out;
@@ -578,8 +576,8 @@ static int __devinit tmio_mmc_probe(struct platform_device *dev)
 
         mmc->ops = &tmio_mmc_ops;
         mmc->caps = MMC_CAP_4_BIT_DATA;
-        mmc->f_min = 46875; /* 24000000 / 512 */
-        mmc->f_max = 24000000;
+        mmc->f_max = pdata->hclk;
+        mmc->f_min = mmc->f_max / 512;
         mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
 
         /* Enable the MMC/SD Control registers */