mx51: add resources for SD/MMC on i.MX51
the attached patch allows SD to work on i.MX51 with Wolfram's drivers
Tested on i.MX51.
Based on original patch from: Richard Zhu <r65037@freescale.com>
Signed-off-by: Eric Bénard <eric@eukrea.com>
diff --git a/arch/arm/mach-mx5/clock-mx51.c b/arch/arm/mach-mx5/clock-mx51.c
index 9a39492..f2aae92 100644
--- a/arch/arm/mach-mx5/clock-mx51.c
+++ b/arch/arm/mach-mx5/clock-mx51.c
@@ -41,6 +41,36 @@
#define MAX_DPLL_WAIT_TRIES 1000 /* 1000 * udelay(1) = 1ms */
+/* calculate best pre and post dividers to get the required divider */
+static void __calc_pre_post_dividers(u32 div, u32 *pre, u32 *post,
+ u32 max_pre, u32 max_post)
+{
+ if (div >= max_pre * max_post) {
+ *pre = max_pre;
+ *post = max_post;
+ } else if (div >= max_pre) {
+ u32 min_pre, temp_pre, old_err, err;
+ min_pre = DIV_ROUND_UP(div, max_post);
+ old_err = max_pre;
+ for (temp_pre = max_pre; temp_pre >= min_pre; temp_pre--) {
+ err = div % temp_pre;
+ if (err == 0) {
+ *pre = temp_pre;
+ break;
+ }
+ err = temp_pre - err;
+ if (err < old_err) {
+ old_err = err;
+ *pre = temp_pre;
+ }
+ }
+ *post = DIV_ROUND_UP(div, *pre);
+ } else {
+ *pre = div;
+ *post = 1;
+ }
+}
+
static void _clk_ccgr_setclk(struct clk *clk, unsigned mode)
{
u32 reg = __raw_readl(clk->enable_reg);
@@ -787,6 +817,20 @@
.secondary = s, \
}
+#define DEFINE_CLOCK_MAX(name, i, er, es, pfx, p, s) \
+ static struct clk name = { \
+ .id = i, \
+ .enable_reg = er, \
+ .enable_shift = es, \
+ .get_rate = pfx##_get_rate, \
+ .set_rate = pfx##_set_rate, \
+ .set_parent = pfx##_set_parent, \
+ .enable = _clk_max_enable, \
+ .disable = _clk_max_disable, \
+ .parent = p, \
+ .secondary = s, \
+ }
+
#define CLK_GET_RATE(name, nr, bitsname) \
static unsigned long clk_##name##_get_rate(struct clk *clk) \
{ \
@@ -817,6 +861,37 @@
return 0; \
}
+#define CLK_SET_RATE(name, nr, bitsname) \
+static int clk_##name##_set_rate(struct clk *clk, unsigned long rate) \
+{ \
+ u32 reg, div, parent_rate; \
+ u32 pre = 0, post = 0; \
+ \
+ parent_rate = clk_get_rate(clk->parent); \
+ div = parent_rate / rate; \
+ \
+ if ((parent_rate / div) != rate) \
+ return -EINVAL; \
+ \
+ __calc_pre_post_dividers(div, &pre, &post, \
+ (MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_MASK >> \
+ MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_OFFSET) + 1, \
+ (MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_MASK >> \
+ MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_OFFSET) + 1);\
+ \
+ /* Set sdhc1 clock divider */ \
+ reg = __raw_readl(MXC_CCM_CSCDR##nr) & \
+ ~(MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_MASK \
+ | MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_MASK); \
+ reg |= (post - 1) << \
+ MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PODF_OFFSET; \
+ reg |= (pre - 1) << \
+ MXC_CCM_CSCDR##nr##_##bitsname##_CLK_PRED_OFFSET; \
+ __raw_writel(reg, MXC_CCM_CSCDR##nr); \
+ \
+ return 0; \
+}
+
/* UART */
CLK_GET_RATE(uart, 1, UART)
CLK_SET_PARENT(uart, 1, UART)
@@ -847,6 +922,15 @@
.set_parent = clk_ecspi_set_parent,
};
+/* eSDHC */
+CLK_GET_RATE(esdhc1, 1, ESDHC1_MSHC1)
+CLK_SET_PARENT(esdhc1, 1, ESDHC1_MSHC1)
+CLK_SET_RATE(esdhc1, 1, ESDHC1_MSHC1)
+
+CLK_GET_RATE(esdhc2, 1, ESDHC2_MSHC2)
+CLK_SET_PARENT(esdhc2, 1, ESDHC2_MSHC2)
+CLK_SET_RATE(esdhc2, 1, ESDHC2_MSHC2)
+
#define DEFINE_CLOCK_FULL(name, i, er, es, gr, sr, e, d, p, s) \
static struct clk name = { \
.id = i, \
@@ -935,6 +1019,16 @@
DEFINE_CLOCK(sdma_clk, 1, MXC_CCM_CCGR4, MXC_CCM_CCGRx_CG15_OFFSET,
NULL, NULL, &ahb_clk, NULL);
+/* eSDHC */
+DEFINE_CLOCK_FULL(esdhc1_ipg_clk, 0, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG0_OFFSET,
+ NULL, NULL, _clk_max_enable, _clk_max_disable, &ipg_clk, NULL);
+DEFINE_CLOCK_MAX(esdhc1_clk, 0, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG1_OFFSET,
+ clk_esdhc1, &pll2_sw_clk, &esdhc1_ipg_clk);
+DEFINE_CLOCK_FULL(esdhc2_ipg_clk, 1, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG2_OFFSET,
+ NULL, NULL, _clk_max_enable, _clk_max_disable, &ipg_clk, NULL);
+DEFINE_CLOCK_MAX(esdhc2_clk, 1, MXC_CCM_CCGR3, MXC_CCM_CCGRx_CG3_OFFSET,
+ clk_esdhc2, &pll2_sw_clk, &esdhc2_ipg_clk);
+
#define _REGISTER_CLOCK(d, n, c) \
{ \
.dev_id = d, \
@@ -968,6 +1062,8 @@
_REGISTER_CLOCK("imx51-ecspi.0", NULL, ecspi1_clk)
_REGISTER_CLOCK("imx51-ecspi.1", NULL, ecspi2_clk)
_REGISTER_CLOCK("imx51-cspi.0", NULL, cspi_clk)
+ _REGISTER_CLOCK("sdhci-esdhc-imx.0", NULL, esdhc1_clk)
+ _REGISTER_CLOCK("sdhci-esdhc-imx.1", NULL, esdhc2_clk)
};
static void clk_tree_init(void)
@@ -1011,6 +1107,14 @@
/* set the usboh3_clk parent to pll2_sw_clk */
clk_set_parent(&usboh3_clk, &pll2_sw_clk);
+ /* Set SDHC parents to be PLL2 */
+ clk_set_parent(&esdhc1_clk, &pll2_sw_clk);
+ clk_set_parent(&esdhc2_clk, &pll2_sw_clk);
+
+ /* set SDHC root clock as 166.25MHZ*/
+ clk_set_rate(&esdhc1_clk, 166250000);
+ clk_set_rate(&esdhc2_clk, 166250000);
+
/* System timer */
mxc_timer_init(&gpt_clk, MX51_IO_ADDRESS(MX51_GPT1_BASE_ADDR),
MX51_MXC_INT_GPT);