aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/spi
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/spi')
-rw-r--r--drivers/spi/spi-omap2-mcspi.c243
1 files changed, 110 insertions, 133 deletions
diff --git a/drivers/spi/spi-omap2-mcspi.c b/drivers/spi/spi-omap2-mcspi.c
index f374eeebb8c..46ef5fe51db 100644
--- a/drivers/spi/spi-omap2-mcspi.c
+++ b/drivers/spi/spi-omap2-mcspi.c
@@ -120,10 +120,6 @@ struct omap2_mcspi_regs {
120}; 120};
121 121
122struct omap2_mcspi { 122struct omap2_mcspi {
123 struct work_struct work;
124 /* lock protects queue and registers */
125 spinlock_t lock;
126 struct list_head msg_queue;
127 struct spi_master *master; 123 struct spi_master *master;
128 /* Virtual base address of the controller */ 124 /* Virtual base address of the controller */
129 void __iomem *base; 125 void __iomem *base;
@@ -131,7 +127,6 @@ struct omap2_mcspi {
131 /* SPI1 has 4 channels, while SPI2 has 2 */ 127 /* SPI1 has 4 channels, while SPI2 has 2 */
132 struct omap2_mcspi_dma *dma_channels; 128 struct omap2_mcspi_dma *dma_channels;
133 struct device *dev; 129 struct device *dev;
134 struct workqueue_struct *wq;
135 struct omap2_mcspi_regs ctx; 130 struct omap2_mcspi_regs ctx;
136}; 131};
137 132
@@ -275,6 +270,23 @@ static int omap2_mcspi_enable_clocks(struct omap2_mcspi *mcspi)
275 return pm_runtime_get_sync(mcspi->dev); 270 return pm_runtime_get_sync(mcspi->dev);
276} 271}
277 272
273static int omap2_prepare_transfer(struct spi_master *master)
274{
275 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
276
277 pm_runtime_get_sync(mcspi->dev);
278 return 0;
279}
280
281static int omap2_unprepare_transfer(struct spi_master *master)
282{
283 struct omap2_mcspi *mcspi = spi_master_get_devdata(master);
284
285 pm_runtime_mark_last_busy(mcspi->dev);
286 pm_runtime_put_autosuspend(mcspi->dev);
287 return 0;
288}
289
278static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit) 290static int mcspi_wait_for_reg_bit(void __iomem *reg, unsigned long bit)
279{ 291{
280 unsigned long timeout; 292 unsigned long timeout;
@@ -846,144 +858,122 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
846 } 858 }
847} 859}
848 860
849static void omap2_mcspi_work(struct work_struct *work) 861static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
850{ 862{
851 struct omap2_mcspi *mcspi;
852
853 mcspi = container_of(work, struct omap2_mcspi, work);
854
855 if (omap2_mcspi_enable_clocks(mcspi) < 0)
856 return;
857
858 spin_lock_irq(&mcspi->lock);
859 863
860 /* We only enable one channel at a time -- the one whose message is 864 /* We only enable one channel at a time -- the one whose message is
861 * at the head of the queue -- although this controller would gladly 865 * -- although this controller would gladly
862 * arbitrate among multiple channels. This corresponds to "single 866 * arbitrate among multiple channels. This corresponds to "single
863 * channel" master mode. As a side effect, we need to manage the 867 * channel" master mode. As a side effect, we need to manage the
864 * chipselect with the FORCE bit ... CS != channel enable. 868 * chipselect with the FORCE bit ... CS != channel enable.
865 */ 869 */
866 while (!list_empty(&mcspi->msg_queue)) {
867 struct spi_message *m;
868 struct spi_device *spi;
869 struct spi_transfer *t = NULL;
870 int cs_active = 0;
871 struct omap2_mcspi_cs *cs;
872 struct omap2_mcspi_device_config *cd;
873 int par_override = 0;
874 int status = 0;
875 u32 chconf;
876
877 m = container_of(mcspi->msg_queue.next, struct spi_message,
878 queue);
879
880 list_del_init(&m->queue);
881 spin_unlock_irq(&mcspi->lock);
882
883 spi = m->spi;
884 cs = spi->controller_state;
885 cd = spi->controller_data;
886 870
887 omap2_mcspi_set_enable(spi, 1); 871 struct spi_device *spi;
888 list_for_each_entry(t, &m->transfers, transfer_list) { 872 struct spi_transfer *t = NULL;
889 if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) { 873 int cs_active = 0;
890 status = -EINVAL; 874 struct omap2_mcspi_cs *cs;
891 break; 875 struct omap2_mcspi_device_config *cd;
892 } 876 int par_override = 0;
893 if (par_override || t->speed_hz || t->bits_per_word) { 877 int status = 0;
894 par_override = 1; 878 u32 chconf;
895 status = omap2_mcspi_setup_transfer(spi, t);
896 if (status < 0)
897 break;
898 if (!t->speed_hz && !t->bits_per_word)
899 par_override = 0;
900 }
901 879
902 if (!cs_active) { 880 spi = m->spi;
903 omap2_mcspi_force_cs(spi, 1); 881 cs = spi->controller_state;
904 cs_active = 1; 882 cd = spi->controller_data;
905 }
906 883
907 chconf = mcspi_cached_chconf0(spi); 884 omap2_mcspi_set_enable(spi, 1);
908 chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK; 885 list_for_each_entry(t, &m->transfers, transfer_list) {
909 chconf &= ~OMAP2_MCSPI_CHCONF_TURBO; 886 if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
887 status = -EINVAL;
888 break;
889 }
890 if (par_override || t->speed_hz || t->bits_per_word) {
891 par_override = 1;
892 status = omap2_mcspi_setup_transfer(spi, t);
893 if (status < 0)
894 break;
895 if (!t->speed_hz && !t->bits_per_word)
896 par_override = 0;
897 }
910 898
911 if (t->tx_buf == NULL) 899 if (!cs_active) {
912 chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY; 900 omap2_mcspi_force_cs(spi, 1);
913 else if (t->rx_buf == NULL) 901 cs_active = 1;
914 chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY; 902 }
915
916 if (cd && cd->turbo_mode && t->tx_buf == NULL) {
917 /* Turbo mode is for more than one word */
918 if (t->len > ((cs->word_len + 7) >> 3))
919 chconf |= OMAP2_MCSPI_CHCONF_TURBO;
920 }
921 903
922 mcspi_write_chconf0(spi, chconf); 904 chconf = mcspi_cached_chconf0(spi);
905 chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
906 chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
923 907
924 if (t->len) { 908 if (t->tx_buf == NULL)
925 unsigned count; 909 chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
910 else if (t->rx_buf == NULL)
911 chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
926 912
927 /* RX_ONLY mode needs dummy data in TX reg */ 913 if (cd && cd->turbo_mode && t->tx_buf == NULL) {
928 if (t->tx_buf == NULL) 914 /* Turbo mode is for more than one word */
929 __raw_writel(0, cs->base 915 if (t->len > ((cs->word_len + 7) >> 3))
930 + OMAP2_MCSPI_TX0); 916 chconf |= OMAP2_MCSPI_CHCONF_TURBO;
917 }
931 918
932 if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES) 919 mcspi_write_chconf0(spi, chconf);
933 count = omap2_mcspi_txrx_dma(spi, t);
934 else
935 count = omap2_mcspi_txrx_pio(spi, t);
936 m->actual_length += count;
937 920
938 if (count != t->len) { 921 if (t->len) {
939 status = -EIO; 922 unsigned count;
940 break; 923
941 } 924 /* RX_ONLY mode needs dummy data in TX reg */
942 } 925 if (t->tx_buf == NULL)
926 __raw_writel(0, cs->base
927 + OMAP2_MCSPI_TX0);
943 928
944 if (t->delay_usecs) 929 if (m->is_dma_mapped || t->len >= DMA_MIN_BYTES)
945 udelay(t->delay_usecs); 930 count = omap2_mcspi_txrx_dma(spi, t);
931 else
932 count = omap2_mcspi_txrx_pio(spi, t);
933 m->actual_length += count;
946 934
947 /* ignore the "leave it on after last xfer" hint */ 935 if (count != t->len) {
948 if (t->cs_change) { 936 status = -EIO;
949 omap2_mcspi_force_cs(spi, 0); 937 break;
950 cs_active = 0;
951 } 938 }
952 } 939 }
953 940
954 /* Restore defaults if they were overriden */ 941 if (t->delay_usecs)
955 if (par_override) { 942 udelay(t->delay_usecs);
956 par_override = 0;
957 status = omap2_mcspi_setup_transfer(spi, NULL);
958 }
959 943
960 if (cs_active) 944 /* ignore the "leave it on after last xfer" hint */
945 if (t->cs_change) {
961 omap2_mcspi_force_cs(spi, 0); 946 omap2_mcspi_force_cs(spi, 0);
947 cs_active = 0;
948 }
949 }
950 /* Restore defaults if they were overriden */
951 if (par_override) {
952 par_override = 0;
953 status = omap2_mcspi_setup_transfer(spi, NULL);
954 }
962 955
963 omap2_mcspi_set_enable(spi, 0); 956 if (cs_active)
964 957 omap2_mcspi_force_cs(spi, 0);
965 m->status = status;
966 m->complete(m->context);
967 958
968 spin_lock_irq(&mcspi->lock); 959 omap2_mcspi_set_enable(spi, 0);
969 }
970 960
971 spin_unlock_irq(&mcspi->lock); 961 m->status = status;
972 962
973 omap2_mcspi_disable_clocks(mcspi);
974} 963}
975 964
976static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m) 965static int omap2_mcspi_transfer_one_message(struct spi_master *master,
966 struct spi_message *m)
977{ 967{
978 struct omap2_mcspi *mcspi; 968 struct omap2_mcspi *mcspi;
979 unsigned long flags;
980 struct spi_transfer *t; 969 struct spi_transfer *t;
981 970
971 mcspi = spi_master_get_devdata(master);
982 m->actual_length = 0; 972 m->actual_length = 0;
983 m->status = 0; 973 m->status = 0;
984 974
985 /* reject invalid messages and transfers */ 975 /* reject invalid messages and transfers */
986 if (list_empty(&m->transfers) || !m->complete) 976 if (list_empty(&m->transfers))
987 return -EINVAL; 977 return -EINVAL;
988 list_for_each_entry(t, &m->transfers, transfer_list) { 978 list_for_each_entry(t, &m->transfers, transfer_list) {
989 const void *tx_buf = t->tx_buf; 979 const void *tx_buf = t->tx_buf;
@@ -995,7 +985,7 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
995 || (t->bits_per_word && 985 || (t->bits_per_word &&
996 ( t->bits_per_word < 4 986 ( t->bits_per_word < 4
997 || t->bits_per_word > 32))) { 987 || t->bits_per_word > 32))) {
998 dev_dbg(&spi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n", 988 dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
999 t->speed_hz, 989 t->speed_hz,
1000 len, 990 len,
1001 tx_buf ? "tx" : "", 991 tx_buf ? "tx" : "",
@@ -1004,7 +994,7 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
1004 return -EINVAL; 994 return -EINVAL;
1005 } 995 }
1006 if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) { 996 if (t->speed_hz && t->speed_hz < (OMAP2_MCSPI_MAX_FREQ >> 15)) {
1007 dev_dbg(&spi->dev, "speed_hz %d below minimum %d Hz\n", 997 dev_dbg(mcspi->dev, "speed_hz %d below minimum %d Hz\n",
1008 t->speed_hz, 998 t->speed_hz,
1009 OMAP2_MCSPI_MAX_FREQ >> 15); 999 OMAP2_MCSPI_MAX_FREQ >> 15);
1010 return -EINVAL; 1000 return -EINVAL;
@@ -1014,35 +1004,30 @@ static int omap2_mcspi_transfer(struct spi_device *spi, struct spi_message *m)
1014 continue; 1004 continue;
1015 1005
1016 if (tx_buf != NULL) { 1006 if (tx_buf != NULL) {
1017 t->tx_dma = dma_map_single(&spi->dev, (void *) tx_buf, 1007 t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
1018 len, DMA_TO_DEVICE); 1008 len, DMA_TO_DEVICE);
1019 if (dma_mapping_error(&spi->dev, t->tx_dma)) { 1009 if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
1020 dev_dbg(&spi->dev, "dma %cX %d bytes error\n", 1010 dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
1021 'T', len); 1011 'T', len);
1022 return -EINVAL; 1012 return -EINVAL;
1023 } 1013 }
1024 } 1014 }
1025 if (rx_buf != NULL) { 1015 if (rx_buf != NULL) {
1026 t->rx_dma = dma_map_single(&spi->dev, rx_buf, t->len, 1016 t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
1027 DMA_FROM_DEVICE); 1017 DMA_FROM_DEVICE);
1028 if (dma_mapping_error(&spi->dev, t->rx_dma)) { 1018 if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
1029 dev_dbg(&spi->dev, "dma %cX %d bytes error\n", 1019 dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
1030 'R', len); 1020 'R', len);
1031 if (tx_buf != NULL) 1021 if (tx_buf != NULL)
1032 dma_unmap_single(&spi->dev, t->tx_dma, 1022 dma_unmap_single(mcspi->dev, t->tx_dma,
1033 len, DMA_TO_DEVICE); 1023 len, DMA_TO_DEVICE);
1034 return -EINVAL; 1024 return -EINVAL;
1035 } 1025 }
1036 } 1026 }
1037 } 1027 }
1038 1028
1039 mcspi = spi_master_get_devdata(spi->master); 1029 omap2_mcspi_work(mcspi, m);
1040 1030 spi_finalize_current_message(master);
1041 spin_lock_irqsave(&mcspi->lock, flags);
1042 list_add_tail(&m->queue, &mcspi->msg_queue);
1043 queue_work(mcspi->wq, &mcspi->work);
1044 spin_unlock_irqrestore(&mcspi->lock, flags);
1045
1046 return 0; 1031 return 0;
1047} 1032}
1048 1033
@@ -1120,7 +1105,9 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
1120 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; 1105 master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
1121 1106
1122 master->setup = omap2_mcspi_setup; 1107 master->setup = omap2_mcspi_setup;
1123 master->transfer = omap2_mcspi_transfer; 1108 master->prepare_transfer_hardware = omap2_prepare_transfer;
1109 master->unprepare_transfer_hardware = omap2_unprepare_transfer;
1110 master->transfer_one_message = omap2_mcspi_transfer_one_message;
1124 master->cleanup = omap2_mcspi_cleanup; 1111 master->cleanup = omap2_mcspi_cleanup;
1125 master->dev.of_node = node; 1112 master->dev.of_node = node;
1126 1113
@@ -1145,12 +1132,6 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
1145 mcspi = spi_master_get_devdata(master); 1132 mcspi = spi_master_get_devdata(master);
1146 mcspi->master = master; 1133 mcspi->master = master;
1147 1134
1148 mcspi->wq = alloc_workqueue(dev_name(&pdev->dev), WQ_MEM_RECLAIM, 1);
1149 if (mcspi->wq == NULL) {
1150 status = -ENOMEM;
1151 goto free_master;
1152 }
1153
1154 r = platform_get_resource(pdev, IORESOURCE_MEM, 0); 1135 r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1155 if (r == NULL) { 1136 if (r == NULL) {
1156 status = -ENODEV; 1137 status = -ENODEV;
@@ -1169,10 +1150,7 @@ static int __devinit omap2_mcspi_probe(struct platform_device *pdev)
1169 } 1150 }
1170 1151
1171 mcspi->dev = &pdev->dev; 1152 mcspi->dev = &pdev->dev;
1172 INIT_WORK(&mcspi->work, omap2_mcspi_work);
1173 1153
1174 spin_lock_init(&mcspi->lock);
1175 INIT_LIST_HEAD(&mcspi->msg_queue);
1176 INIT_LIST_HEAD(&mcspi->ctx.cs); 1154 INIT_LIST_HEAD(&mcspi->ctx.cs);
1177 1155
1178 mcspi->dma_channels = kcalloc(master->num_chipselect, 1156 mcspi->dma_channels = kcalloc(master->num_chipselect,
@@ -1253,7 +1231,6 @@ static int __devexit omap2_mcspi_remove(struct platform_device *pdev)
1253 1231
1254 spi_unregister_master(master); 1232 spi_unregister_master(master);
1255 kfree(dma_channels); 1233 kfree(dma_channels);
1256 destroy_workqueue(mcspi->wq);
1257 platform_set_drvdata(pdev, NULL); 1234 platform_set_drvdata(pdev, NULL);
1258 1235
1259 return 0; 1236 return 0;
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-22 07:42:04 -0400