--- /dev/null
+--- a/drivers/spi/spi-ath79.c
++++ b/drivers/spi/spi-ath79.c
+@@ -37,6 +37,11 @@
+
+ #define ATH79_SPI_CS_LINE_MAX 2
+
++enum ath79_spi_state {
++ ATH79_SPI_STATE_WAIT_CMD = 0,
++ ATH79_SPI_STATE_WAIT_READ,
++};
++
+ struct ath79_spi {
+ struct spi_bitbang bitbang;
+ u32 ioc_base;
+@@ -44,6 +49,11 @@ struct ath79_spi {
+ void __iomem *base;
+ struct clk *clk;
+ unsigned rrw_delay;
++
++ enum ath79_spi_state state;
++ u32 clk_div;
++ unsigned long read_addr;
++ unsigned long ahb_rate;
+ };
+
+ static inline u32 ath79_spi_rr(struct ath79_spi *sp, unsigned reg)
+@@ -108,9 +118,6 @@ static void ath79_spi_enable(struct ath7
+ /* save CTRL register */
+ sp->reg_ctrl = ath79_spi_rr(sp, AR71XX_SPI_REG_CTRL);
+ sp->ioc_base = ath79_spi_rr(sp, AR71XX_SPI_REG_IOC);
+-
+- /* TODO: setup speed? */
+- ath79_spi_wr(sp, AR71XX_SPI_REG_CTRL, 0x43);
+ }
+
+ static void ath79_spi_disable(struct ath79_spi *sp)
+@@ -222,6 +229,110 @@ static u32 ath79_spi_txrx_mode0(struct s
+ return ath79_spi_rr(sp, AR71XX_SPI_REG_RDS);
+ }
+
++static int ath79_spi_do_read_flash_data(struct spi_device *spi,
++ struct spi_transfer *t)
++{
++ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
++
++ /* disable GPIO mode */
++ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, 0);
++
++ memcpy_fromio(t->rx_buf, sp->base + sp->read_addr, t->len);
++
++ /* enable GPIO mode */
++ ath79_spi_wr(sp, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
++
++ /* restore IOC register */
++ ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
++
++ return t->len;
++}
++
++static int ath79_spi_do_read_flash_cmd(struct spi_device *spi,
++ struct spi_transfer *t)
++{
++ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
++ int len;
++ const u8 *p;
++
++ sp->read_addr = 0;
++
++ len = t->len - 1;
++ p = t->tx_buf;
++
++ while (len--) {
++ p++;
++ sp->read_addr <<= 8;
++ sp->read_addr |= *p;
++ }
++
++ return t->len;
++}
++
++static bool ath79_spi_is_read_cmd(struct spi_device *spi,
++ struct spi_transfer *t)
++{
++ return t->type == SPI_TRANSFER_FLASH_READ_CMD;
++}
++
++static bool ath79_spi_is_data_read(struct spi_device *spi,
++ struct spi_transfer *t)
++{
++ return t->type == SPI_TRANSFER_FLASH_READ_DATA;
++}
++
++static int ath79_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
++{
++ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
++ int ret;
++
++ switch (sp->state) {
++ case ATH79_SPI_STATE_WAIT_CMD:
++ if (ath79_spi_is_read_cmd(spi, t)) {
++ ret = ath79_spi_do_read_flash_cmd(spi, t);
++ sp->state = ATH79_SPI_STATE_WAIT_READ;
++ } else {
++ ret = spi_bitbang_bufs(spi, t);
++ }
++ break;
++
++ case ATH79_SPI_STATE_WAIT_READ:
++ if (ath79_spi_is_data_read(spi, t)) {
++ ret = ath79_spi_do_read_flash_data(spi, t);
++ } else {
++ dev_warn(&spi->dev, "flash data read expected\n");
++ ret = -EIO;
++ }
++ sp->state = ATH79_SPI_STATE_WAIT_CMD;
++ break;
++
++ default:
++ BUG();
++ }
++
++ return ret;
++}
++
++static int ath79_spi_setup_transfer(struct spi_device *spi,
++ struct spi_transfer *t)
++{
++ struct ath79_spi *sp = ath79_spidev_to_sp(spi);
++ struct ath79_spi_controller_data *cdata;
++ int ret;
++
++ ret = spi_bitbang_setup_transfer(spi, t);
++ if (ret)
++ return ret;
++
++ cdata = spi->controller_data;
++ if (cdata->is_flash)
++ sp->bitbang.txrx_bufs = ath79_spi_txrx_bufs;
++ else
++ sp->bitbang.txrx_bufs = spi_bitbang_bufs;
++
++ return ret;
++}
++
+ static __devinit int ath79_spi_probe(struct platform_device *pdev)
+ {
+ struct spi_master *master;
+@@ -244,6 +355,8 @@ static __devinit int ath79_spi_probe(str
+ sp = spi_master_get_devdata(master);
+ platform_set_drvdata(pdev, sp);
+
++ sp->state = ATH79_SPI_STATE_WAIT_CMD;
++
+ master->setup = ath79_spi_setup;
+ master->cleanup = ath79_spi_cleanup;
+ master->bus_num = pdata->bus_num;
+@@ -252,7 +365,7 @@ static __devinit int ath79_spi_probe(str
+ sp->bitbang.master = spi_master_get(master);
+ sp->bitbang.chipselect = ath79_spi_chipselect;
+ sp->bitbang.txrx_word[SPI_MODE_0] = ath79_spi_txrx_mode0;
+- sp->bitbang.setup_transfer = spi_bitbang_setup_transfer;
++ sp->bitbang.setup_transfer = ath79_spi_setup_transfer;
+ sp->bitbang.flags = SPI_CS_HIGH;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+@@ -277,7 +390,8 @@ static __devinit int ath79_spi_probe(str
+ if (ret)
+ goto err_clk_put;
+
+- rate = DIV_ROUND_UP(clk_get_rate(sp->clk), MHZ);
++ sp->ahb_rate = clk_get_rate(sp->clk);
++ rate = DIV_ROUND_UP(sp->ahb_rate, MHZ);
+ if (!rate) {
+ ret = -EINVAL;
+ goto err_clk_disable;
+--- a/arch/mips/include/asm/mach-ath79/ath79_spi_platform.h
++++ b/arch/mips/include/asm/mach-ath79/ath79_spi_platform.h
+@@ -24,6 +24,7 @@ enum ath79_spi_cs_type {
+ struct ath79_spi_controller_data {
+ enum ath79_spi_cs_type cs_type;
+ unsigned cs_line;
++ bool is_flash;
+ };
+
+ #endif /* _ATH79_SPI_PLATFORM_H */
projects / openwrt.git / blobdiff