From 072de836f53be56a70cecf70b43ae43b7ce17376 Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Mon, 11 Dec 2023 10:08:36 +0000
Subject: [PATCH] mk-rootfs.sh
---
kernel/drivers/spi/spi-meson-spicc.c | 598 ++++++++++++++++++++++++++++++++++++++++++++---------------
1 files changed, 445 insertions(+), 153 deletions(-)
diff --git a/kernel/drivers/spi/spi-meson-spicc.c b/kernel/drivers/spi/spi-meson-spicc.c
index 24196fb..6974a1c 100644
--- a/kernel/drivers/spi/spi-meson-spicc.c
+++ b/kernel/drivers/spi/spi-meson-spicc.c
@@ -9,17 +9,18 @@
#include <linux/bitfield.h>
#include <linux/clk.h>
+#include <linux/clk-provider.h>
#include <linux/device.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/reset.h>
-#include <linux/gpio.h>
/*
* The Meson SPICC controller could support DMA based transfers, but is not
@@ -34,7 +35,6 @@
* to have a CS go down over the full transfer
*/
-#define SPICC_MAX_FREQ 30000000
#define SPICC_MAX_BURST 128
/* Register Map */
@@ -106,7 +106,21 @@
#define SPICC_SWAP_RO BIT(14) /* RX FIFO Data Swap Read-Only */
#define SPICC_SWAP_W1 BIT(15) /* RX FIFO Data Swap Write-Only */
#define SPICC_DLYCTL_RO_MASK GENMASK(20, 15) /* Delay Control Read-Only */
-#define SPICC_DLYCTL_W1_MASK GENMASK(21, 16) /* Delay Control Write-Only */
+#define SPICC_MO_DELAY_MASK GENMASK(17, 16) /* Master Output Delay */
+#define SPICC_MO_NO_DELAY 0
+#define SPICC_MO_DELAY_1_CYCLE 1
+#define SPICC_MO_DELAY_2_CYCLE 2
+#define SPICC_MO_DELAY_3_CYCLE 3
+#define SPICC_MI_DELAY_MASK GENMASK(19, 18) /* Master Input Delay */
+#define SPICC_MI_NO_DELAY 0
+#define SPICC_MI_DELAY_1_CYCLE 1
+#define SPICC_MI_DELAY_2_CYCLE 2
+#define SPICC_MI_DELAY_3_CYCLE 3
+#define SPICC_MI_CAP_DELAY_MASK GENMASK(21, 20) /* Master Capture Delay */
+#define SPICC_CAP_AHEAD_2_CYCLE 0
+#define SPICC_CAP_AHEAD_1_CYCLE 1
+#define SPICC_CAP_NO_DELAY 2
+#define SPICC_CAP_DELAY_1_CYCLE 3
#define SPICC_FIFORST_RO_MASK GENMASK(22, 21) /* FIFO Softreset Read-Only */
#define SPICC_FIFORST_W1_MASK GENMASK(23, 22) /* FIFO Softreset Write-Only */
@@ -114,30 +128,61 @@
#define SPICC_DWADDR 0x24 /* Write Address of DMA */
+#define SPICC_ENH_CTL0 0x38 /* Enhanced Feature */
+#define SPICC_ENH_CLK_CS_DELAY_MASK GENMASK(15, 0)
+#define SPICC_ENH_DATARATE_MASK GENMASK(23, 16)
+#define SPICC_ENH_DATARATE_EN BIT(24)
+#define SPICC_ENH_MOSI_OEN BIT(25)
+#define SPICC_ENH_CLK_OEN BIT(26)
+#define SPICC_ENH_CS_OEN BIT(27)
+#define SPICC_ENH_CLK_CS_DELAY_EN BIT(28)
+#define SPICC_ENH_MAIN_CLK_AO BIT(29)
+
#define writel_bits_relaxed(mask, val, addr) \
writel_relaxed((readl_relaxed(addr) & ~(mask)) | (val), addr)
-#define SPICC_BURST_MAX 16
-#define SPICC_FIFO_HALF 10
+struct meson_spicc_data {
+ unsigned int max_speed_hz;
+ unsigned int min_speed_hz;
+ unsigned int fifo_size;
+ bool has_oen;
+ bool has_enhance_clk_div;
+ bool has_pclk;
+};
struct meson_spicc_device {
struct spi_master *master;
struct platform_device *pdev;
void __iomem *base;
struct clk *core;
+ struct clk *pclk;
+ struct clk_divider pow2_div;
+ struct clk *clk;
struct spi_message *message;
struct spi_transfer *xfer;
+ const struct meson_spicc_data *data;
u8 *tx_buf;
u8 *rx_buf;
unsigned int bytes_per_word;
unsigned long tx_remain;
- unsigned long txb_remain;
unsigned long rx_remain;
- unsigned long rxb_remain;
unsigned long xfer_remain;
- bool is_burst_end;
- bool is_last_burst;
};
+
+#define pow2_clk_to_spicc(_div) container_of(_div, struct meson_spicc_device, pow2_div)
+
+static void meson_spicc_oen_enable(struct meson_spicc_device *spicc)
+{
+ u32 conf;
+
+ if (!spicc->data->has_oen)
+ return;
+
+ conf = readl_relaxed(spicc->base + SPICC_ENH_CTL0) |
+ SPICC_ENH_MOSI_OEN | SPICC_ENH_CLK_OEN | SPICC_ENH_CS_OEN;
+
+ writel_relaxed(conf, spicc->base + SPICC_ENH_CTL0);
+}
static inline bool meson_spicc_txfull(struct meson_spicc_device *spicc)
{
@@ -147,7 +192,7 @@
static inline bool meson_spicc_rxready(struct meson_spicc_device *spicc)
{
- return FIELD_GET(SPICC_RH | SPICC_RR | SPICC_RF_EN,
+ return FIELD_GET(SPICC_RH | SPICC_RR | SPICC_RF,
readl_relaxed(spicc->base + SPICC_STATREG));
}
@@ -202,34 +247,22 @@
spicc->base + SPICC_TXDATA);
}
-static inline u32 meson_spicc_setup_rx_irq(struct meson_spicc_device *spicc,
- u32 irq_ctrl)
+static inline void meson_spicc_setup_burst(struct meson_spicc_device *spicc)
{
- if (spicc->rx_remain > SPICC_FIFO_HALF)
- irq_ctrl |= SPICC_RH_EN;
- else
- irq_ctrl |= SPICC_RR_EN;
- return irq_ctrl;
-}
-
-static inline void meson_spicc_setup_burst(struct meson_spicc_device *spicc,
- unsigned int burst_len)
-{
+ unsigned int burst_len = min_t(unsigned int,
+ spicc->xfer_remain /
+ spicc->bytes_per_word,
+ spicc->data->fifo_size);
/* Setup Xfer variables */
spicc->tx_remain = burst_len;
spicc->rx_remain = burst_len;
spicc->xfer_remain -= burst_len * spicc->bytes_per_word;
- spicc->is_burst_end = false;
- if (burst_len < SPICC_BURST_MAX || !spicc->xfer_remain)
- spicc->is_last_burst = true;
- else
- spicc->is_last_burst = false;
/* Setup burst length */
writel_bits_relaxed(SPICC_BURSTLENGTH_MASK,
FIELD_PREP(SPICC_BURSTLENGTH_MASK,
- burst_len),
+ burst_len - 1),
spicc->base + SPICC_CONREG);
/* Fill TX FIFO */
@@ -239,97 +272,71 @@
static irqreturn_t meson_spicc_irq(int irq, void *data)
{
struct meson_spicc_device *spicc = (void *) data;
- u32 ctrl = readl_relaxed(spicc->base + SPICC_INTREG);
- u32 stat = readl_relaxed(spicc->base + SPICC_STATREG) & ctrl;
- ctrl &= ~(SPICC_RH_EN | SPICC_RR_EN);
+ writel_bits_relaxed(SPICC_TC, SPICC_TC, spicc->base + SPICC_STATREG);
/* Empty RX FIFO */
meson_spicc_rx(spicc);
- /* Enable TC interrupt since we transferred everything */
- if (!spicc->tx_remain && !spicc->rx_remain) {
- spicc->is_burst_end = true;
+ if (!spicc->xfer_remain) {
+ /* Disable all IRQs */
+ writel(0, spicc->base + SPICC_INTREG);
- /* Enable TC interrupt */
- ctrl |= SPICC_TC_EN;
+ spi_finalize_current_transfer(spicc->master);
- /* Reload IRQ status */
- stat = readl_relaxed(spicc->base + SPICC_STATREG) & ctrl;
+ return IRQ_HANDLED;
}
- /* Check transfer complete */
- if ((stat & SPICC_TC) && spicc->is_burst_end) {
- unsigned int burst_len;
+ /* Setup burst */
+ meson_spicc_setup_burst(spicc);
- /* Clear TC bit */
- writel_relaxed(SPICC_TC, spicc->base + SPICC_STATREG);
-
- /* Disable TC interrupt */
- ctrl &= ~SPICC_TC_EN;
-
- if (spicc->is_last_burst) {
- /* Disable all IRQs */
- writel(0, spicc->base + SPICC_INTREG);
-
- spi_finalize_current_transfer(spicc->master);
-
- return IRQ_HANDLED;
- }
-
- burst_len = min_t(unsigned int,
- spicc->xfer_remain / spicc->bytes_per_word,
- SPICC_BURST_MAX);
-
- /* Setup burst */
- meson_spicc_setup_burst(spicc, burst_len);
-
- /* Restart burst */
- writel_bits_relaxed(SPICC_XCH, SPICC_XCH,
- spicc->base + SPICC_CONREG);
- }
-
- /* Setup RX interrupt trigger */
- ctrl = meson_spicc_setup_rx_irq(spicc, ctrl);
-
- /* Reconfigure interrupts */
- writel(ctrl, spicc->base + SPICC_INTREG);
+ /* Start burst */
+ writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG);
return IRQ_HANDLED;
}
-static u32 meson_spicc_setup_speed(struct meson_spicc_device *spicc, u32 conf,
- u32 speed)
+static void meson_spicc_auto_io_delay(struct meson_spicc_device *spicc)
{
- unsigned long parent, value;
- unsigned int i, div;
+ u32 div, hz;
+ u32 mi_delay, cap_delay;
+ u32 conf;
- parent = clk_get_rate(spicc->core);
-
- /* Find closest inferior/equal possible speed */
- for (i = 0 ; i < 7 ; ++i) {
- /* 2^(data_rate+2) */
- value = parent >> (i + 2);
-
- if (value <= speed)
- break;
+ if (spicc->data->has_enhance_clk_div) {
+ div = FIELD_GET(SPICC_ENH_DATARATE_MASK,
+ readl_relaxed(spicc->base + SPICC_ENH_CTL0));
+ div++;
+ div <<= 1;
+ } else {
+ div = FIELD_GET(SPICC_DATARATE_MASK,
+ readl_relaxed(spicc->base + SPICC_CONREG));
+ div += 2;
+ div = 1 << div;
}
- /* If provided speed it lower than max divider, use max divider */
- if (i > 7) {
- div = 7;
- dev_warn_once(&spicc->pdev->dev, "unable to get close to speed %u\n",
- speed);
- } else
- div = i;
+ mi_delay = SPICC_MI_NO_DELAY;
+ cap_delay = SPICC_CAP_AHEAD_2_CYCLE;
+ hz = clk_get_rate(spicc->clk);
- dev_dbg(&spicc->pdev->dev, "parent %lu, speed %u -> %lu (%u)\n",
- parent, speed, value, div);
+ if (hz >= 100000000)
+ cap_delay = SPICC_CAP_DELAY_1_CYCLE;
+ else if (hz >= 80000000)
+ cap_delay = SPICC_CAP_NO_DELAY;
+ else if (hz >= 40000000)
+ cap_delay = SPICC_CAP_AHEAD_1_CYCLE;
+ else if (div >= 16)
+ mi_delay = SPICC_MI_DELAY_3_CYCLE;
+ else if (div >= 8)
+ mi_delay = SPICC_MI_DELAY_2_CYCLE;
+ else if (div >= 6)
+ mi_delay = SPICC_MI_DELAY_1_CYCLE;
- conf &= ~SPICC_DATARATE_MASK;
- conf |= FIELD_PREP(SPICC_DATARATE_MASK, div);
-
- return conf;
+ conf = readl_relaxed(spicc->base + SPICC_TESTREG);
+ conf &= ~(SPICC_MO_DELAY_MASK | SPICC_MI_DELAY_MASK
+ | SPICC_MI_CAP_DELAY_MASK);
+ conf |= FIELD_PREP(SPICC_MI_DELAY_MASK, mi_delay);
+ conf |= FIELD_PREP(SPICC_MI_CAP_DELAY_MASK, cap_delay);
+ writel_relaxed(conf, spicc->base + SPICC_TESTREG);
}
static void meson_spicc_setup_xfer(struct meson_spicc_device *spicc,
@@ -340,9 +347,6 @@
/* Read original configuration */
conf = conf_orig = readl_relaxed(spicc->base + SPICC_CONREG);
- /* Select closest divider */
- conf = meson_spicc_setup_speed(spicc, conf, xfer->speed_hz);
-
/* Setup word width */
conf &= ~SPICC_BITLENGTH_MASK;
conf |= FIELD_PREP(SPICC_BITLENGTH_MASK,
@@ -351,6 +355,30 @@
/* Ignore if unchanged */
if (conf != conf_orig)
writel_relaxed(conf, spicc->base + SPICC_CONREG);
+
+ clk_set_rate(spicc->clk, xfer->speed_hz);
+
+ meson_spicc_auto_io_delay(spicc);
+
+ writel_relaxed(0, spicc->base + SPICC_DMAREG);
+}
+
+static void meson_spicc_reset_fifo(struct meson_spicc_device *spicc)
+{
+ if (spicc->data->has_oen)
+ writel_bits_relaxed(SPICC_ENH_MAIN_CLK_AO,
+ SPICC_ENH_MAIN_CLK_AO,
+ spicc->base + SPICC_ENH_CTL0);
+
+ writel_bits_relaxed(SPICC_FIFORST_W1_MASK, SPICC_FIFORST_W1_MASK,
+ spicc->base + SPICC_TESTREG);
+
+ while (meson_spicc_rxready(spicc))
+ readl_relaxed(spicc->base + SPICC_RXDATA);
+
+ if (spicc->data->has_oen)
+ writel_bits_relaxed(SPICC_ENH_MAIN_CLK_AO, 0,
+ spicc->base + SPICC_ENH_CTL0);
}
static int meson_spicc_transfer_one(struct spi_master *master,
@@ -358,8 +386,6 @@
struct spi_transfer *xfer)
{
struct meson_spicc_device *spicc = spi_master_get_devdata(master);
- unsigned int burst_len;
- u32 irq = 0;
/* Store current transfer */
spicc->xfer = xfer;
@@ -373,22 +399,22 @@
spicc->bytes_per_word =
DIV_ROUND_UP(spicc->xfer->bits_per_word, 8);
+ if (xfer->len % spicc->bytes_per_word)
+ return -EINVAL;
+
/* Setup transfer parameters */
meson_spicc_setup_xfer(spicc, xfer);
- burst_len = min_t(unsigned int,
- spicc->xfer_remain / spicc->bytes_per_word,
- SPICC_BURST_MAX);
+ meson_spicc_reset_fifo(spicc);
- meson_spicc_setup_burst(spicc, burst_len);
-
- irq = meson_spicc_setup_rx_irq(spicc, irq);
+ /* Setup burst */
+ meson_spicc_setup_burst(spicc);
/* Start burst */
writel_bits_relaxed(SPICC_XCH, SPICC_XCH, spicc->base + SPICC_CONREG);
/* Enable interrupts */
- writel_relaxed(irq, spicc->base + SPICC_INTREG);
+ writel_relaxed(SPICC_TC_EN, spicc->base + SPICC_INTREG);
return 1;
}
@@ -398,7 +424,7 @@
{
struct meson_spicc_device *spicc = spi_master_get_devdata(master);
struct spi_device *spi = message->spi;
- u32 conf = 0;
+ u32 conf = readl_relaxed(spicc->base + SPICC_CONREG) & SPICC_DATARATE_MASK;
/* Store current message */
spicc->message = message;
@@ -435,8 +461,6 @@
/* Select CS */
conf |= FIELD_PREP(SPICC_CS_MASK, spi->chip_select);
- /* Default Clock rate core/4 */
-
/* Default 8bit word */
conf |= FIELD_PREP(SPICC_BITLENGTH_MASK, 8 - 1);
@@ -445,7 +469,7 @@
/* Setup no wait cycles by default */
writel_relaxed(0, spicc->base + SPICC_PERIODREG);
- writel_bits_relaxed(BIT(24), BIT(24), spicc->base + SPICC_TESTREG);
+ writel_bits_relaxed(SPICC_LBC_W1, 0, spicc->base + SPICC_TESTREG);
return 0;
}
@@ -453,58 +477,253 @@
static int meson_spicc_unprepare_transfer(struct spi_master *master)
{
struct meson_spicc_device *spicc = spi_master_get_devdata(master);
+ u32 conf = readl_relaxed(spicc->base + SPICC_CONREG) & SPICC_DATARATE_MASK;
/* Disable all IRQs */
writel(0, spicc->base + SPICC_INTREG);
- /* Disable controller */
- writel_bits_relaxed(SPICC_ENABLE, 0, spicc->base + SPICC_CONREG);
-
device_reset_optional(&spicc->pdev->dev);
+
+ /* Set default configuration, keeping datarate field */
+ writel_relaxed(conf, spicc->base + SPICC_CONREG);
return 0;
}
static int meson_spicc_setup(struct spi_device *spi)
{
- int ret = 0;
-
if (!spi->controller_state)
spi->controller_state = spi_master_get_devdata(spi->master);
- else if (gpio_is_valid(spi->cs_gpio))
- goto out_gpio;
- else if (spi->cs_gpio == -ENOENT)
- return 0;
- if (gpio_is_valid(spi->cs_gpio)) {
- ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev));
- if (ret) {
- dev_err(&spi->dev, "failed to request cs gpio\n");
- return ret;
- }
- }
-
-out_gpio:
- ret = gpio_direction_output(spi->cs_gpio,
- !(spi->mode & SPI_CS_HIGH));
-
- return ret;
+ return 0;
}
static void meson_spicc_cleanup(struct spi_device *spi)
{
- if (gpio_is_valid(spi->cs_gpio))
- gpio_free(spi->cs_gpio);
-
spi->controller_state = NULL;
+}
+
+/*
+ * The Clock Mux
+ * x-----------------x x------------x x------\
+ * |---| pow2 fixed div |---| pow2 div |----| |
+ * | x-----------------x x------------x | |
+ * src ---| | mux |-- out
+ * | x-----------------x x------------x | |
+ * |---| enh fixed div |---| enh div |0---| |
+ * x-----------------x x------------x x------/
+ *
+ * Clk path for GX series:
+ * src -> pow2 fixed div -> pow2 div -> out
+ *
+ * Clk path for AXG series:
+ * src -> pow2 fixed div -> pow2 div -> mux -> out
+ * src -> enh fixed div -> enh div -> mux -> out
+ *
+ * Clk path for G12A series:
+ * pclk -> pow2 fixed div -> pow2 div -> mux -> out
+ * pclk -> enh fixed div -> enh div -> mux -> out
+ *
+ * The pow2 divider is tied to the controller HW state, and the
+ * divider is only valid when the controller is initialized.
+ *
+ * A set of clock ops is added to make sure we don't read/set this
+ * clock rate while the controller is in an unknown state.
+ */
+
+static unsigned long meson_spicc_pow2_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_divider *divider = to_clk_divider(hw);
+ struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);
+
+ if (!spicc->master->cur_msg)
+ return 0;
+
+ return clk_divider_ops.recalc_rate(hw, parent_rate);
+}
+
+static int meson_spicc_pow2_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct clk_divider *divider = to_clk_divider(hw);
+ struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);
+
+ if (!spicc->master->cur_msg)
+ return -EINVAL;
+
+ return clk_divider_ops.determine_rate(hw, req);
+}
+
+static int meson_spicc_pow2_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_divider *divider = to_clk_divider(hw);
+ struct meson_spicc_device *spicc = pow2_clk_to_spicc(divider);
+
+ if (!spicc->master->cur_msg)
+ return -EINVAL;
+
+ return clk_divider_ops.set_rate(hw, rate, parent_rate);
+}
+
+const struct clk_ops meson_spicc_pow2_clk_ops = {
+ .recalc_rate = meson_spicc_pow2_recalc_rate,
+ .determine_rate = meson_spicc_pow2_determine_rate,
+ .set_rate = meson_spicc_pow2_set_rate,
+};
+
+static int meson_spicc_pow2_clk_init(struct meson_spicc_device *spicc)
+{
+ struct device *dev = &spicc->pdev->dev;
+ struct clk_fixed_factor *pow2_fixed_div;
+ struct clk_init_data init;
+ struct clk *clk;
+ struct clk_parent_data parent_data[2];
+ char name[64];
+
+ memset(&init, 0, sizeof(init));
+ memset(&parent_data, 0, sizeof(parent_data));
+
+ init.parent_data = parent_data;
+
+ /* algorithm for pow2 div: rate = freq / 4 / (2 ^ N) */
+
+ pow2_fixed_div = devm_kzalloc(dev, sizeof(*pow2_fixed_div), GFP_KERNEL);
+ if (!pow2_fixed_div)
+ return -ENOMEM;
+
+ snprintf(name, sizeof(name), "%s#pow2_fixed_div", dev_name(dev));
+ init.name = name;
+ init.ops = &clk_fixed_factor_ops;
+ init.flags = 0;
+ if (spicc->data->has_pclk)
+ parent_data[0].hw = __clk_get_hw(spicc->pclk);
+ else
+ parent_data[0].hw = __clk_get_hw(spicc->core);
+ init.num_parents = 1;
+
+ pow2_fixed_div->mult = 1,
+ pow2_fixed_div->div = 4,
+ pow2_fixed_div->hw.init = &init;
+
+ clk = devm_clk_register(dev, &pow2_fixed_div->hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return PTR_ERR(clk);
+
+ snprintf(name, sizeof(name), "%s#pow2_div", dev_name(dev));
+ init.name = name;
+ init.ops = &meson_spicc_pow2_clk_ops;
+ /*
+ * Set NOCACHE here to make sure we read the actual HW value
+ * since we reset the HW after each transfer.
+ */
+ init.flags = CLK_SET_RATE_PARENT | CLK_GET_RATE_NOCACHE;
+ parent_data[0].hw = &pow2_fixed_div->hw;
+ init.num_parents = 1;
+
+ spicc->pow2_div.shift = 16,
+ spicc->pow2_div.width = 3,
+ spicc->pow2_div.flags = CLK_DIVIDER_POWER_OF_TWO,
+ spicc->pow2_div.reg = spicc->base + SPICC_CONREG;
+ spicc->pow2_div.hw.init = &init;
+
+ spicc->clk = devm_clk_register(dev, &spicc->pow2_div.hw);
+ if (WARN_ON(IS_ERR(spicc->clk)))
+ return PTR_ERR(spicc->clk);
+
+ return 0;
+}
+
+static int meson_spicc_enh_clk_init(struct meson_spicc_device *spicc)
+{
+ struct device *dev = &spicc->pdev->dev;
+ struct clk_fixed_factor *enh_fixed_div;
+ struct clk_divider *enh_div;
+ struct clk_mux *mux;
+ struct clk_init_data init;
+ struct clk *clk;
+ struct clk_parent_data parent_data[2];
+ char name[64];
+
+ memset(&init, 0, sizeof(init));
+ memset(&parent_data, 0, sizeof(parent_data));
+
+ init.parent_data = parent_data;
+
+ /* algorithm for enh div: rate = freq / 2 / (N + 1) */
+
+ enh_fixed_div = devm_kzalloc(dev, sizeof(*enh_fixed_div), GFP_KERNEL);
+ if (!enh_fixed_div)
+ return -ENOMEM;
+
+ snprintf(name, sizeof(name), "%s#enh_fixed_div", dev_name(dev));
+ init.name = name;
+ init.ops = &clk_fixed_factor_ops;
+ init.flags = 0;
+ if (spicc->data->has_pclk)
+ parent_data[0].hw = __clk_get_hw(spicc->pclk);
+ else
+ parent_data[0].hw = __clk_get_hw(spicc->core);
+ init.num_parents = 1;
+
+ enh_fixed_div->mult = 1,
+ enh_fixed_div->div = 2,
+ enh_fixed_div->hw.init = &init;
+
+ clk = devm_clk_register(dev, &enh_fixed_div->hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return PTR_ERR(clk);
+
+ enh_div = devm_kzalloc(dev, sizeof(*enh_div), GFP_KERNEL);
+ if (!enh_div)
+ return -ENOMEM;
+
+ snprintf(name, sizeof(name), "%s#enh_div", dev_name(dev));
+ init.name = name;
+ init.ops = &clk_divider_ops;
+ init.flags = CLK_SET_RATE_PARENT;
+ parent_data[0].hw = &enh_fixed_div->hw;
+ init.num_parents = 1;
+
+ enh_div->shift = 16,
+ enh_div->width = 8,
+ enh_div->reg = spicc->base + SPICC_ENH_CTL0;
+ enh_div->hw.init = &init;
+
+ clk = devm_clk_register(dev, &enh_div->hw);
+ if (WARN_ON(IS_ERR(clk)))
+ return PTR_ERR(clk);
+
+ mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
+ if (!mux)
+ return -ENOMEM;
+
+ snprintf(name, sizeof(name), "%s#sel", dev_name(dev));
+ init.name = name;
+ init.ops = &clk_mux_ops;
+ parent_data[0].hw = &spicc->pow2_div.hw;
+ parent_data[1].hw = &enh_div->hw;
+ init.num_parents = 2;
+ init.flags = CLK_SET_RATE_PARENT;
+
+ mux->mask = 0x1,
+ mux->shift = 24,
+ mux->reg = spicc->base + SPICC_ENH_CTL0;
+ mux->hw.init = &init;
+
+ spicc->clk = devm_clk_register(dev, &mux->hw);
+ if (WARN_ON(IS_ERR(spicc->clk)))
+ return PTR_ERR(spicc->clk);
+
+ return 0;
}
static int meson_spicc_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct meson_spicc_device *spicc;
- struct resource *res;
- int ret, irq, rate;
+ int ret, irq;
master = spi_alloc_master(&pdev->dev, sizeof(*spicc));
if (!master) {
@@ -514,16 +733,26 @@
spicc = spi_master_get_devdata(master);
spicc->master = master;
+ spicc->data = of_device_get_match_data(&pdev->dev);
+ if (!spicc->data) {
+ dev_err(&pdev->dev, "failed to get match data\n");
+ ret = -EINVAL;
+ goto out_master;
+ }
+
spicc->pdev = pdev;
platform_set_drvdata(pdev, spicc);
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- spicc->base = devm_ioremap_resource(&pdev->dev, res);
+ spicc->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(spicc->base)) {
dev_err(&pdev->dev, "io resource mapping failed\n");
ret = PTR_ERR(spicc->base);
goto out_master;
}
+
+ /* Set master mode and enable controller */
+ writel_relaxed(SPICC_ENABLE | SPICC_MODE_MASTER,
+ spicc->base + SPICC_CONREG);
/* Disable all IRQs */
writel_relaxed(0, spicc->base + SPICC_INTREG);
@@ -548,12 +777,26 @@
goto out_master;
}
+ if (spicc->data->has_pclk) {
+ spicc->pclk = devm_clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(spicc->pclk)) {
+ dev_err(&pdev->dev, "pclk clock request failed\n");
+ ret = PTR_ERR(spicc->pclk);
+ goto out_master;
+ }
+ }
+
ret = clk_prepare_enable(spicc->core);
if (ret) {
dev_err(&pdev->dev, "core clock enable failed\n");
goto out_master;
}
- rate = clk_get_rate(spicc->core);
+
+ ret = clk_prepare_enable(spicc->pclk);
+ if (ret) {
+ dev_err(&pdev->dev, "pclk clock enable failed\n");
+ goto out_core_clk;
+ }
device_reset_optional(&pdev->dev);
@@ -565,18 +808,30 @@
SPI_BPW_MASK(16) |
SPI_BPW_MASK(8);
master->flags = (SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX);
- master->min_speed_hz = rate >> 9;
+ master->min_speed_hz = spicc->data->min_speed_hz;
+ master->max_speed_hz = spicc->data->max_speed_hz;
master->setup = meson_spicc_setup;
master->cleanup = meson_spicc_cleanup;
master->prepare_message = meson_spicc_prepare_message;
master->unprepare_transfer_hardware = meson_spicc_unprepare_transfer;
master->transfer_one = meson_spicc_transfer_one;
+ master->use_gpio_descriptors = true;
- /* Setup max rate according to the Meson GX datasheet */
- if ((rate >> 2) > SPICC_MAX_FREQ)
- master->max_speed_hz = SPICC_MAX_FREQ;
- else
- master->max_speed_hz = rate >> 2;
+ meson_spicc_oen_enable(spicc);
+
+ ret = meson_spicc_pow2_clk_init(spicc);
+ if (ret) {
+ dev_err(&pdev->dev, "pow2 clock registration failed\n");
+ goto out_clk;
+ }
+
+ if (spicc->data->has_enhance_clk_div) {
+ ret = meson_spicc_enh_clk_init(spicc);
+ if (ret) {
+ dev_err(&pdev->dev, "clock registration failed\n");
+ goto out_clk;
+ }
+ }
ret = devm_spi_register_master(&pdev->dev, master);
if (ret) {
@@ -587,6 +842,9 @@
return 0;
out_clk:
+ clk_disable_unprepare(spicc->pclk);
+
+out_core_clk:
clk_disable_unprepare(spicc->core);
out_master:
@@ -603,15 +861,49 @@
writel(0, spicc->base + SPICC_CONREG);
clk_disable_unprepare(spicc->core);
+ clk_disable_unprepare(spicc->pclk);
spi_master_put(spicc->master);
return 0;
}
+static const struct meson_spicc_data meson_spicc_gx_data = {
+ .max_speed_hz = 30000000,
+ .min_speed_hz = 325000,
+ .fifo_size = 16,
+};
+
+static const struct meson_spicc_data meson_spicc_axg_data = {
+ .max_speed_hz = 80000000,
+ .min_speed_hz = 325000,
+ .fifo_size = 16,
+ .has_oen = true,
+ .has_enhance_clk_div = true,
+};
+
+static const struct meson_spicc_data meson_spicc_g12a_data = {
+ .max_speed_hz = 166666666,
+ .min_speed_hz = 50000,
+ .fifo_size = 15,
+ .has_oen = true,
+ .has_enhance_clk_div = true,
+ .has_pclk = true,
+};
+
static const struct of_device_id meson_spicc_of_match[] = {
- { .compatible = "amlogic,meson-gx-spicc", },
- { .compatible = "amlogic,meson-axg-spicc", },
+ {
+ .compatible = "amlogic,meson-gx-spicc",
+ .data = &meson_spicc_gx_data,
+ },
+ {
+ .compatible = "amlogic,meson-axg-spicc",
+ .data = &meson_spicc_axg_data,
+ },
+ {
+ .compatible = "amlogic,meson-g12a-spicc",
+ .data = &meson_spicc_g12a_data,
+ },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, meson_spicc_of_match);
--
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