2 files changed, 164 insertions, 52 deletions

diff --git a/drivers/mmc/host/s3cmci.c b/drivers/mmc/host/s3cmci.c
index ae16d845d746..3b2085b57769 100644
--- a/drivers/mmc/host/s3cmci.c
+++ b/drivers/mmc/host/s3cmci.c
@@ -3,6 +3,9 @@
  *
  *  Copyright (C) 2004-2006 maintech GmbH, Thomas Kleffel <tk@maintech.de>
  *
+ * Current driver maintained by Ben Dooks and Simtec Electronics
+ *  Copyright (C) 2008 Simtec Electronics <ben-linux@fluff.org>
+ *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
@@ -13,6 +16,7 @@
 #include <linux/clk.h>
 #include <linux/mmc/host.h>
 #include <linux/platform_device.h>
+#include <linux/cpufreq.h>
 #include <linux/irq.h>
 #include <linux/io.h>
 
@@ -39,9 +43,9 @@ enum dbg_channels {
         dbg_conf  = (1 << 8),
 };
 
-static const int dbgmap_err   = dbg_err | dbg_fail;
+static const int dbgmap_err   = dbg_fail;
 static const int dbgmap_info  = dbg_info | dbg_conf;
-static const int dbgmap_debug = dbg_debug;
+static const int dbgmap_debug = dbg_err | dbg_debug;
 
 #define dbg(host, channels, args...)              \
         do {                                      \
@@ -189,7 +193,7 @@ static inline void clear_imask(struct s3cmci_host *host)
 }
 
 static inline int get_data_buffer(struct s3cmci_host *host,
-                                  u32 *words, u32 **pointer)
+                                  u32 *bytes, u32 **pointer)
 {
         struct scatterlist *sg;
 
@@ -206,7 +210,7 @@ static inline int get_data_buffer(struct s3cmci_host *host,
         }
         sg = &host->mrq->data->sg[host->pio_sgptr];
 
-        *words = sg->length >> 2;
+        *bytes = sg->length;
         *pointer = sg_virt(sg);
 
         host->pio_sgptr++;
@@ -222,7 +226,7 @@ static inline u32 fifo_count(struct s3cmci_host *host)
         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 
         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
-        return fifostat >> 2;
+        return fifostat;
 }
 
 static inline u32 fifo_free(struct s3cmci_host *host)
@@ -230,13 +234,15 @@ static inline u32 fifo_free(struct s3cmci_host *host)
         u32 fifostat = readl(host->base + S3C2410_SDIFSTA);
 
         fifostat &= S3C2410_SDIFSTA_COUNTMASK;
-        return (63 - fifostat) >> 2;
+        return 63 - fifostat;
 }
 
 static void do_pio_read(struct s3cmci_host *host)
 {
         int res;
         u32 fifo;
+        u32 *ptr;
+        u32 fifo_words;
         void __iomem *from_ptr;
 
         /* write real prescaler to host, it might be set slow to fix */
@@ -245,8 +251,8 @@ static void do_pio_read(struct s3cmci_host *host)
         from_ptr = host->base + host->sdidata;
 
         while ((fifo = fifo_count(host))) {
-                if (!host->pio_words) {
-                        res = get_data_buffer(host, &host->pio_words,
+                if (!host->pio_bytes) {
+                        res = get_data_buffer(host, &host->pio_bytes,
                                               &host->pio_ptr);
                         if (res) {
                                 host->pio_active = XFER_NONE;
@@ -259,26 +265,47 @@ static void do_pio_read(struct s3cmci_host *host)
 
                         dbg(host, dbg_pio,
                             "pio_read(): new target: [%i]@[%p]\n",
-                            host->pio_words, host->pio_ptr);
+                            host->pio_bytes, host->pio_ptr);
                 }
 
                 dbg(host, dbg_pio,
                     "pio_read(): fifo:[%02i] buffer:[%03i] dcnt:[%08X]\n",
-                    fifo, host->pio_words,
+                    fifo, host->pio_bytes,
                     readl(host->base + S3C2410_SDIDCNT));
 
-                if (fifo > host->pio_words)
-                        fifo = host->pio_words;
+                /* If we have reached the end of the block, we can
+                 * read a word and get 1 to 3 bytes.  If we in the
+                 * middle of the block, we have to read full words,
+                 * otherwise we will write garbage, so round down to
+                 * an even multiple of 4. */
+                if (fifo >= host->pio_bytes)
+                        fifo = host->pio_bytes;
+                else
+                        fifo -= fifo & 3;
 
-                host->pio_words -= fifo;
+                host->pio_bytes -= fifo;
                 host->pio_count += fifo;
 
-                while (fifo--)
-                        *(host->pio_ptr++) = readl(from_ptr);
+                fifo_words = fifo >> 2;
+                ptr = host->pio_ptr;
+                while (fifo_words--)
+                        *ptr++ = readl(from_ptr);
+                host->pio_ptr = ptr;
+
+                if (fifo & 3) {
+                        u32 n = fifo & 3;
+                        u32 data = readl(from_ptr);
+                        u8 *p = (u8 *)host->pio_ptr;
+
+                        while (n--) {
+                                *p++ = data;
+                                data >>= 8;
+                        }
+                }
         }
 
-        if (!host->pio_words) {
-                res = get_data_buffer(host, &host->pio_words, &host->pio_ptr);
+        if (!host->pio_bytes) {
+                res = get_data_buffer(host, &host->pio_bytes, &host->pio_ptr);
                 if (res) {
                         dbg(host, dbg_pio,
                             "pio_read(): complete (no more buffers).\n");
@@ -298,12 +325,13 @@ static void do_pio_write(struct s3cmci_host *host)
         void __iomem *to_ptr;
         int res;
         u32 fifo;
+        u32 *ptr;
 
         to_ptr = host->base + host->sdidata;
 
         while ((fifo = fifo_free(host))) {
-                if (!host->pio_words) {
-                        res = get_data_buffer(host, &host->pio_words,
+                if (!host->pio_bytes) {
+                        res = get_data_buffer(host, &host->pio_bytes,
                                                         &host->pio_ptr);
                         if (res) {
                                 dbg(host, dbg_pio,
@@ -315,18 +343,27 @@ static void do_pio_write(struct s3cmci_host *host)
 
                         dbg(host, dbg_pio,
                             "pio_write(): new source: [%i]@[%p]\n",
-                            host->pio_words, host->pio_ptr);
+                            host->pio_bytes, host->pio_ptr);
 
                 }
 
-                if (fifo > host->pio_words)
-                        fifo = host->pio_words;
+                /* If we have reached the end of the block, we have to
+                 * write exactly the remaining number of bytes.  If we
+                 * in the middle of the block, we have to write full
+                 * words, so round down to an even multiple of 4. */
+                if (fifo >= host->pio_bytes)
+                        fifo = host->pio_bytes;
+                else
+                        fifo -= fifo & 3;
 
-                host->pio_words -= fifo;
+                host->pio_bytes -= fifo;
                 host->pio_count += fifo;
 
+                fifo = (fifo + 3) >> 2;
+                ptr = host->pio_ptr;
                 while (fifo--)
-                        writel(*(host->pio_ptr++), to_ptr);
+                        writel(*ptr++, to_ptr);
+                host->pio_ptr = ptr;
         }
 
         enable_imask(host, S3C2410_SDIIMSK_TXFIFOHALF);
@@ -349,9 +386,9 @@ static void pio_tasklet(unsigned long data)
                 clear_imask(host);
                 if (host->pio_active != XFER_NONE) {
                         dbg(host, dbg_err, "unfinished %s "
-                            "- pio_count:[%u] pio_words:[%u]\n",
+                            "- pio_count:[%u] pio_bytes:[%u]\n",
                             (host->pio_active == XFER_READ) ? "read" : "write",
-                            host->pio_count, host->pio_words);
+                            host->pio_count, host->pio_bytes);
 
                         if (host->mrq->data)
                                 host->mrq->data->error = -EINVAL;
@@ -812,11 +849,10 @@ static int s3cmci_setup_data(struct s3cmci_host *host, struct mmc_data *data)
                 /* We cannot deal with unaligned blocks with more than
                  * one block being transfered. */
 
-                if (data->blocks > 1)
+                if (data->blocks > 1) {
+                        pr_warning("%s: can't do non-word sized block transfers (blksz %d)\n", __func__, data->blksz);
                         return -EINVAL;
-
-                /* No support yet for non-word block transfers. */
-                return -EINVAL;
+                }
         }
 
         while (readl(host->base + S3C2410_SDIDSTA) &
@@ -896,7 +932,7 @@ static int s3cmci_prepare_pio(struct s3cmci_host *host, struct mmc_data *data)
         BUG_ON((data->flags & BOTH_DIR) == BOTH_DIR);
 
         host->pio_sgptr = 0;
-        host->pio_words = 0;
+        host->pio_bytes = 0;
         host->pio_count = 0;
         host->pio_active = rw ? XFER_WRITE : XFER_READ;
 
@@ -1033,10 +1069,33 @@ static void s3cmci_request(struct mmc_host *mmc, struct mmc_request *mrq)
                 s3cmci_send_request(mmc);
 }
 
+static void s3cmci_set_clk(struct s3cmci_host *host, struct mmc_ios *ios)
+{
+        u32 mci_psc;
+
+        /* Set clock */
+        for (mci_psc = 0; mci_psc < 255; mci_psc++) {
+                host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
+
+                if (host->real_rate <= ios->clock)
+                        break;
+        }
+
+        if (mci_psc > 255)
+                mci_psc = 255;
+
+        host->prescaler = mci_psc;
+        writel(host->prescaler, host->base + S3C2410_SDIPRE);
+
+        /* If requested clock is 0, real_rate will be 0, too */
+        if (ios->clock == 0)
+                host->real_rate = 0;
+}
+
 static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
 {
         struct s3cmci_host *host = mmc_priv(mmc);
-        u32 mci_psc, mci_con;
+        u32 mci_con;
 
         /* Set the power state */
 
@@ -1074,23 +1133,7 @@ static void s3cmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                 break;
         }
 
-        /* Set clock */
-        for (mci_psc = 0; mci_psc < 255; mci_psc++) {
-                host->real_rate = host->clk_rate / (host->clk_div*(mci_psc+1));
-
-                if (host->real_rate <= ios->clock)
-                        break;
-        }
-
-        if (mci_psc > 255)
-                mci_psc = 255;
-
-        host->prescaler = mci_psc;
-        writel(host->prescaler, host->base + S3C2410_SDIPRE);
-
-        /* If requested clock is 0, real_rate will be 0, too */
-        if (ios->clock == 0)
-                host->real_rate = 0;
+        s3cmci_set_clk(host, ios);
 
         /* Set CLOCK_ENABLE */
         if (ios->clock)
@@ -1148,6 +1191,61 @@ static struct s3c24xx_mci_pdata s3cmci_def_pdata = {
          * checks. Any zero fields to ensure reaonable defaults are picked. */
 };
 
+#ifdef CONFIG_CPU_FREQ
+
+static int s3cmci_cpufreq_transition(struct notifier_block *nb,
+                                     unsigned long val, void *data)
+{
+        struct s3cmci_host *host;
+        struct mmc_host *mmc;
+        unsigned long newclk;
+        unsigned long flags;
+
+        host = container_of(nb, struct s3cmci_host, freq_transition);
+        newclk = clk_get_rate(host->clk);
+        mmc = host->mmc;
+
+        if ((val == CPUFREQ_PRECHANGE && newclk > host->clk_rate) ||
+            (val == CPUFREQ_POSTCHANGE && newclk < host->clk_rate)) {
+                spin_lock_irqsave(&mmc->lock, flags);
+
+                host->clk_rate = newclk;
+
+                if (mmc->ios.power_mode != MMC_POWER_OFF &&
+                    mmc->ios.clock != 0)
+                        s3cmci_set_clk(host, &mmc->ios);
+
+                spin_unlock_irqrestore(&mmc->lock, flags);
+        }
+
+        return 0;
+}
+
+static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
+{
+        host->freq_transition.notifier_call = s3cmci_cpufreq_transition;
+
+        return cpufreq_register_notifier(&host->freq_transition,
+                                         CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
+{
+        cpufreq_unregister_notifier(&host->freq_transition,
+                                    CPUFREQ_TRANSITION_NOTIFIER);
+}
+
+#else
+static inline int s3cmci_cpufreq_register(struct s3cmci_host *host)
+{
+        return 0;
+}
+
+static inline void s3cmci_cpufreq_deregister(struct s3cmci_host *host)
+{
+}
+#endif
+
 static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
 {
         struct s3cmci_host *host;
@@ -1298,10 +1396,16 @@ static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
             (host->is2440?"2440":""),
             host->base, host->irq, host->irq_cd, host->dma);
 
+        ret = s3cmci_cpufreq_register(host);
+        if (ret) {
+                dev_err(&pdev->dev, "failed to register cpufreq\n");
+                goto free_dmabuf;
+        }
+
         ret = mmc_add_host(mmc);
         if (ret) {
                 dev_err(&pdev->dev, "failed to add mmc host.\n");
-                goto free_dmabuf;
+                goto free_cpufreq;
         }
 
         platform_set_drvdata(pdev, mmc);
@@ -1309,6 +1413,9 @@ static int __devinit s3cmci_probe(struct platform_device *pdev, int is2440)
 
         return 0;
 
+ free_cpufreq:
+        s3cmci_cpufreq_deregister(host);
+
  free_dmabuf:
         clk_disable(host->clk);
 
@@ -1342,6 +1449,7 @@ static void s3cmci_shutdown(struct platform_device *pdev)
         if (host->irq_cd >= 0)
                 free_irq(host->irq_cd, host);
 
+        s3cmci_cpufreq_deregister(host);
         mmc_remove_host(mmc);
         clk_disable(host->clk);
 }
@@ -1455,7 +1563,7 @@ module_exit(s3cmci_exit);
 
 MODULE_DESCRIPTION("Samsung S3C MMC/SD Card Interface driver");
 MODULE_LICENSE("GPL v2");
-MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>");
+MODULE_AUTHOR("Thomas Kleffel <tk@maintech.de>, Ben Dooks <ben-linux@fluff.org>");
 MODULE_ALIAS("platform:s3c2410-sdi");
 MODULE_ALIAS("platform:s3c2412-sdi");
 MODULE_ALIAS("platform:s3c2440-sdi");
diff --git a/drivers/mmc/host/s3cmci.h b/drivers/mmc/host/s3cmci.h
index 37d9c60010c9..ca1ba3d58cfd 100644
--- a/drivers/mmc/host/s3cmci.h
+++ b/drivers/mmc/host/s3cmci.h
@@ -51,7 +51,7 @@ struct s3cmci_host {
         int                     dma_complete;
 
         u32                     pio_sgptr;
-        u32                     pio_words;
+        u32                     pio_bytes;
         u32                     pio_count;
         u32                     *pio_ptr;
 #define XFER_NONE 0
@@ -67,4 +67,8 @@ struct s3cmci_host {
 
         unsigned int            ccnt, dcnt;
         struct tasklet_struct   pio_tasklet;
+
+#ifdef CONFIG_CPU_FREQ
+        struct notifier_block   freq_transition;
+#endif
 };